A positioning device for quickly positioning a guide vane servomotor

Abstract

The utility model discloses a positioning device for quick positioning installation guide vane servomotor, including positioning pin, locating block and be used for connecting positioning pin and locating block's locking piece, and positioning pin can be assembled with locating block through locking piece and form the positioning structure, and the positioning structure is welded in the corresponding connecting position of guide vane servomotor and guide vane servomotor fixed base, and positioning pin and locating block are welded respectively in guide vane servomotor removal side and guide vane servomotor fixed base, and the cooperation of positioning structure realizes the disposable accurate back loading of guide vane servomotor after repair, and need not manual adjustment for many times. Through the taper surface adaptation cooperation of positioning pin and locating block, the corresponding welding positioning of removal side-fixed base is combined, avoids the positioning deviation caused by the blur of steel mark, and only needs once installation positioning structure, and directly through the assembly cooperation positioning when back loading, need not many times dismounting adjustment, greatly shortens the repair work hour, reduces the operation risk of repair personnel.

Description

Technical Field

[0001] This utility model relates to the technical field of guide vane relay devices for hydropower stations, specifically to a positioning device for quickly positioning and installing guide vane relay devices. Background Technology

[0002] During the maintenance of the guide vane servo motor in a hydropower station, the servo motor must be dismantled, disassembled, and its components repaired or replaced in sequence. The reassembly process after maintenance requires extremely high precision. It is necessary to ensure that when the piston of the guide vane servo motor is in the fully open or fully closed position, the horizontal deviation of the piston rod is no more than 0.1 mm / m, and the relative elevation deviation between the two servo motors must be controlled within a reasonable range.

[0003] In existing technologies, the reinstallation of guide vane relays often relies on steel markings on the components before maintenance for positioning. This method has significant drawbacks: First, the steel markings are easily blurred by grinding and collisions during maintenance, leading to inaccurate positioning benchmarks; second, after reinstallation, problems such as excessive horizontal deviation of the piston rod and excessive relative elevation deviation between the two relays frequently occur; third, to correct the deviations, the relays need to be repeatedly disassembled and adjusted, which not only increases maintenance time but also requires frequent lifting operations, significantly increasing the frequency of high-risk operations for maintenance personnel, making the operation cumbersome and unsafe. Utility Model Content

[0004] The purpose of this utility model is to provide a positioning device for quickly locating and installing guide vane relays, so as to solve the problem of cumbersome operation of maintenance work for existing hydropower station guide vane relays.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: a positioning device for quickly positioning and installing a guide vane servoir, comprising a positioning pin, a positioning block, and a locking component for connecting the positioning pin and the positioning block; The positioning pin and positioning block can be assembled into a positioning structure through locking components. The positioning structure is welded to the corresponding connection positions of the guide vane servo and the guide vane servo fixed base. The positioning pin and positioning block are respectively welded to the removal side of the guide vane servo and the guide vane servo fixed base. Through the cooperation of the positioning structure, the guide vane servo can be accurately reinstalled after repair without the need for multiple manual adjustments.

[0006] Furthermore, the locating pin is a tapered pin, and the locating block has a tapered mating surface that is adapted to the tapered pin.

[0007] Furthermore, the angle of the tapered surface of the tapered pin and the angle of the tapered mating surface of the positioning block are both 20°.

[0008] Furthermore, both the welding surfaces of the locating pin and the locating block are chamfered.

[0009] Furthermore, the chamfer is 45° and the chamfer width is 25mm.

[0010] Furthermore, there are two sets of positioning structures. The two sets of positioning structures are welded to both sides of the connection of the guide vane relay fixed base, and the welding positions of the two sets of positioning structures form a 90° angle with each other.

[0011] Furthermore, the welding positions of the positioning pin and the guide vane servo connector removal side, and the welding positions of the positioning block and the guide vane servo connector fixing base, correspond one-to-one.

[0012] Furthermore, the clearance between the locating pin and the locating block is no greater than 0.05mm.

[0013] Furthermore, the locking element is a locking bolt.

[0014] Furthermore, the locking bolts are M30*80.

[0015] This utility model has the following advantages: by matching the conical surface of the positioning pin and the positioning block, and by welding the corresponding positioning of the removal side-fixed base, the positioning deviation caused by the blurring of the steel stamp mark is avoided. Moreover, the positioning structure only needs to be installed once, and the positioning can be directly achieved by the component matching during reinstallation without the need for multiple disassembly and adjustment. This greatly shortens the maintenance time, reduces the frequency of high-risk lifting operations, and lowers the operational risks for maintenance personnel. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the positioning pin structure in this utility model; Figure 2 This is a schematic diagram of the positioning block structure in this utility model; Figure 3 This is a schematic diagram of the structure of this utility model. Figures 1 to 3 The reference numerals in the attached drawings are respectively: 1-locating pin, 2-locating block, 3-locking element. Detailed Implementation

[0017] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0018] like Figures 1 to 3As shown, a positioning device for quickly positioning and installing a guide vane servo unit includes a positioning pin 1, a positioning block 2, and a locking component 3 for connecting the positioning pin 1 and the positioning block 2. The positioning pin 1 and the positioning block 2 can be assembled into a positioning structure through the locking component 3. The positioning structure is welded to the corresponding connection positions of the guide vane servo unit and the guide vane servo unit fixing base. The positioning pin 1 and the positioning block 2 are respectively welded to the removal side of the guide vane servo unit and the guide vane servo unit fixing base. Through the cooperation of the positioning structure, the guide vane servo unit can be accurately reinstalled in one go after repair, without the need for multiple manual adjustments. The locking component 3 is a locking bolt with a specification of M30*80.

[0019] Positioning pin 1 serves as the active positioning reference component on the guide vane servo side. It works in conjunction with positioning block 2 to achieve position alignment. It is welded to the removal side of the guide vane servo and is disassembled and inspected along with the servo. It always maintains a fixed positional relationship with the servo to ensure that the position reference is consistent during reinstallation. Its surface is polished with a surface roughness of 6.3 micrometers and is made of Q235B material.

[0020] Positioning pin 1 is a tapered pin, and positioning block 2 has a tapered mating surface adapted to the tapered pin. This simultaneously limits the horizontal radial offset, vertical elevation deviation, and circumferential rotational deviation during the reinstallation of the guide vane servo. Furthermore, the tapered structure, through its self-centering characteristic, naturally forms a small and uniform mating clearance, avoiding the problem of excessive local clearance that easily occurs with planar mating. This ensures that the position of the servo after reinstallation is consistent with the pre-maintenance reference, directly meeting the horizontal deviation requirements. During reinstallation, no manual precision alignment is required; simply align the tapered pin with the tapered mating surface of positioning block 2, and the guiding property of the tapered surface automatically guides the servo back into position. In addition, the surface contact tapered fit evenly distributes the impact and gravity during servo reinstallation to the positioning structure, avoiding localized stress concentration that easily occurs with point / line contact (such as cylindrical pins), reducing the risk of deformation of positioning block 2 or the tapered pin after welding, and ensuring that the positioning reference does not shift during long-term use.

[0021] The angle of the tapered surface of the conical pin and the angle of the tapered mating surface of the positioning block 2 are both 20°. This 20° tapered angle is a medium tapered angle design, which avoids the assembly difficulties caused by an overly tight fit with a small tapered angle (e.g., ≤10°) and the excessive positioning clearance caused by an overly loose fit with a large tapered angle (e.g., ≥30°). At this angle, the tapered pin and the tapered surface of the positioning block 2 can naturally form a surface contact self-centering effect: during reinstallation, even if there is a slight initial deviation in the relay, the 20° tapered surface can guide the tapered pin to automatically slide into the matching tapered surface of the positioning block 2 through contact force, ultimately returning the relay to the reference position before maintenance, which helps to control horizontal deviation and relative elevation deviation and meet accuracy standards.

[0022] Both the welding surfaces of locating pin 1 and locating block 2 are chamfered at 45° with a width of 25mm. This 45° chamfer creates a standard V-shaped groove on the welding surfaces of locating pin 1 and locating block 2. Compared to flat welding without a chamfer, this groove provides ample space for the weld metal, allowing it to fully fill the root of the weld surface and avoiding incomplete penetration and insufficient weld metal issues common in flat welding. Simultaneously, the 25mm chamfer width is compatible with the diameter of welding rods and welding current commonly used in hydropower station maintenance, ensuring that the weld metal completely covers the chamfered area, forming a strong bond between the weld and the base material. This prevents the locating structure from easily detaching or breaking after welding, meeting long-term load-bearing requirements. In addition, the 45° chamfer can increase the fusion area of ​​the welding surface. During welding, the high-temperature weld metal can make more full contact with the chamfered base material surface, reducing the incidence of welding defects such as slag inclusions and porosity. Furthermore, the 45° chamfer can make the heat evenly transferred to the interior of the base material, improving the fusion quality and further strengthening the load-bearing capacity of the welded joint, ensuring that the positioning components do not loosen during the reinstallation and operation of the relay.

[0023] Two sets of positioning structures are used, each welded to both sides of the guide vane servo base connection, with the welding positions of the two sets forming a 90° angle with each other. These two 90° angled positioning structures form a two-dimensional constraint system, one primarily restricting lateral displacement and the other restricting longitudinal displacement. Simultaneously, the 90° angled layout restricts the circumferential rotation of the servo unit through a two-point positioning principle, preventing excessive horizontal deviation of the piston rod due to rotation. This ensures that the servo unit's position after reassembly is completely consistent with the pre-maintenance reference, directly meeting accuracy requirements. In addition, traditional steel stamp positioning is prone to elevation deviation due to the ambiguity of a single point benchmark. However, two sets of 90° positioning structures can form a dual benchmark for verification. During reassembly, the conical pin-conical mating surfaces of the two positioning structures must be made to fit together simultaneously. If there is an elevation deviation, one of the positioning structures will inevitably fail to fit properly. At this time, only minor adjustments are needed to make both structures fit together. No additional measuring tools are required, which efficiently solves the problem of large relative elevation deviation. Furthermore, the two 90° positioning structures can evenly distribute the load to the two welding nodes, with each positioning structure bearing only half of the load. Combined with the strength characteristics of Q235B material, this significantly reduces the risk of weld cracking and component deformation, ensuring that the positioning reference does not shift over a long period of time.

[0024] The welding positions of positioning pin 1 and guide vane servo connector removal side, and positioning block 2 and guide vane servo connector fixing base, correspond one-to-one. This ensures that the relative positions of positioning pin 1 and positioning block 2 before maintenance (such as alignment of the central axis and fixed distance) can be reproduced during reassembly. This avoids mismatch between dynamic and static benchmarks due to welding position misalignment, fundamentally eliminating the problem of ambiguous benchmarks in traditional technology. It lays a benchmark foundation for accurate reassembly. Furthermore, the fit clearance between positioning pin 1 and positioning block 2 is no greater than 0.05mm, which is a micro-clear gap design. This gap is much smaller than the allowable deviation for reassembly accuracy (0.1mm / m), effectively limiting the relative displacement of positioning pin 1 and positioning block 2 after reassembly. This ensures that the position of the servo connector after reassembly is consistent with the benchmark height before maintenance, meeting the piston rod horizontal deviation requirements.

[0025] Additionally, it should be noted that components not described in detail in this article are existing technologies.

[0026] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A positioning device for quickly positioning and installing a guide vane relay, characterized in that, It includes a positioning pin (1), a positioning block (2), and a locking member (3) for connecting the positioning pin (1) and the positioning block (2); The positioning pin (1) and the positioning block (2) can be assembled into a positioning structure by the locking member (3). The positioning structure is welded to the corresponding connection position of the guide vane servo and the guide vane servo fixed base. The positioning pin (1) and the positioning block (2) are respectively welded to the guide vane servo removal side and the guide vane servo fixed base. The positioning structure enables the guide vane servo to be accurately reinstalled after repair without multiple manual adjustments.

2. The positioning device for quickly positioning and installing a guide vane relay according to claim 1, characterized in that, The positioning pin (1) is a conical pin, and the positioning block (2) is provided with a conical mating surface that is adapted to the conical pin.

3. The positioning device for quickly positioning and installing a guide vane relay according to claim 2, characterized in that, The angle of the tapered surface of the tapered pin and the angle of the tapered mating surface of the positioning block (2) are both 20°.

4. The positioning device for quickly positioning and installing a guide vane relay according to claim 3, characterized in that, Both the welding surface of the positioning pin (1) and the welding surface of the positioning block (2) are chamfered.

5. The positioning device for quickly positioning and installing a guide vane relay according to claim 4, characterized in that, The chamfer is 45° and the chamfer width is 25mm.

6. The positioning device for quickly positioning and installing a guide vane servoir according to any one of claims 1 to 3, characterized in that, The number of positioning structures is two sets, and the two sets of positioning structures are respectively welded to both sides of the connection of the guide vane relay fixed base, and the welding positions of the two sets of positioning structures are at a 90° angle to each other.

7. The positioning device for quickly positioning and installing a guide vane servoir according to claim 1, characterized in that, The positioning pin (1) corresponds one-to-one with the welding position on the removal side of the guide vane relay and the positioning block (2) corresponds one-to-one with the welding position on the fixed base of the guide vane relay.

8. The positioning device for quickly positioning and installing a guide vane servoir according to claim 7, characterized in that, The clearance between the positioning pin (1) and the positioning block (2) is no greater than 0.05 mm.

9. The positioning device for quickly positioning and installing a guide vane servoir according to claim 1, characterized in that, The locking component (3) is a locking bolt.

10. The positioning device for quickly positioning and installing a guide vane servoir according to claim 9, characterized in that, The locking bolt has a specification of M30*80.

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