A tool for quickly adjusting the chord distance of small equally divided stator locating ribs

Abstract

The utility model discloses a tool for quickly adjusting the chord distance of small equally divided ribs of a stator positioning rib, and relates to the technical field of mechanical installation tooling. The utility model comprises a ruler tail, one end of the ruler tail is fixedly connected with a ruler tail limiter, and the other end of the ruler tail is fixedly connected with a ruler head, the inner side of the ruler tail limiter is fixedly connected with a ruler tail fitting plate, and the ruler tail fitting plate is sleeved and fixed on a reference rib, the inner side of the ruler head is fixedly connected with a ruler head fitting plate, and the ruler head fitting plate is clamped and fixed with a positioning rib to be measured, the outer end of the ruler head is fixedly connected with a dial indicator, and the measuring end of the dial indicator is abutted against the outer side of the positioning rib to be measured, the ruler tail fitting plate is clamped on the outer wall of the reference rib, the ruler head fitting plate is clamped on the outer wall of the positioning rib to be measured, and then a measuring tool is used to read a relative value through the dial indicator at the same position, and the purpose of quickly adjusting the stator positioning rib is achieved by adjusting the relative values ​​of other positions during the adjustment process.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical installation tooling, in particular to a tool for quickly adjusting the chord distance of small equally divided stator positioning ribs. Background Art

[0002] At present, the main types of hydro-turbine generators are mixed flow, axial flow propeller, bulb cross-flow, etc. The stator, as an important component of the hydro-turbine generator set, mainly converts mechanical energy into electrical energy through the principle of electromagnetic induction. After a long period of development, hydropower technology has become mature. At present, what is pursued in the construction process is higher efficiency and higher quality.

[0003] The stator is composed of two parts: the stator core and the stator coil. The overall shape of the stator core will directly affect the quality and progress of the stator bar embedding process. The stator core is generally composed of a stator base, positioning ribs, upper and lower pressure plates, tension screws, and silicon steel sheets. Its general structure is: the positioning ribs are welded to the stator base according to the chord spacing required by the drawings, and then the dovetail slots of the silicon steel sheets are embedded in the positioning ribs in a specific arrangement to form a full circle. Repeat this step until the designed height is reached (it must be higher than the designed height after lamination, and the specific unit refers to the specific drawings). The data of the positioning ribs before stator lamination is very important, because the matching clearance between the stator ribs and the dovetail slots of the silicon steel sheets is small. If the geometric tolerance of the positioning ribs is not well controlled, it may cause the lamination process to fail to proceed or the quality acceptance after lamination is completed.

[0004] After consulting the data, it is found that the adjustment of the large equal-divided ribs of the stator locating ribs is generally measured by using an internal micrometer, while the adjustment of the small equal-divided ribs does not have a professional measuring tool, and is generally adjusted using the chord distance template provided by the factory. During the adjustment of the small equal-divided ribs of the stator locating ribs of the 550MV unit of the Maerdang Hydropower Station, it was found that the measuring tools provided by the manufacturer could not accurately read the readings when fine-tuning the small equal-divided ribs of the stator locating ribs. In the acceptance criteria, the qualified standard for the deviation of the chord distance of the locating ribs at the same height from the average value should be ≤±0.25mm, the excellent standard should be ≤±0.20mm, and the standard for the chord distance of adjacent locating ribs at the same height should not be greater than 0.6% of the designed air gap, that is, ≤0.25mm[1] (the deviation of the chord distance of the locating ribs is ≤±0.15mm, and the deviation of the chord distance of adjacent locating ribs in the same ring is ≤±0.10mm[2]). The measuring tools provided by the manufacturer cannot read the readings, and it is impossible to conduct accurate data acceptance. Therefore, we propose a tool for quickly adjusting the chord distance of the small equal-divided ribs of the stator locating ribs. Utility Model Content

[0005] The purpose of the utility model is to solve the problem that the adjustment of the large equal-divided ribs of the stator locating ribs is generally measured by using an internal micrometer, while the adjustment of the small equal-divided ribs does not have a professional measuring tool and is generally adjusted by using a factory-supplied chord distance template. During the adjustment of the small equal-divided ribs of the stator locating ribs of the 550MV unit of the Maerdang Hydropower Station, it was found that the measuring tools provided by the manufacturer could not accurately read the readings when the small equal-divided ribs of the stator locating ribs were fine-tuned. In the acceptance standard, the qualified standard for the deviation of the chord distance of the locating ribs of the same height from the average value should be ≤±0.25mm, the excellent standard should be ≤±0.20mm, and the standard for the chord distance of adjacent locating ribs of the same height should not be greater than 0.6% of the designed air gap, that is, ≤0.25mm[1] (the deviation of the chord distance of the locating ribs is ≤±0.15mm, and the deviation of the chord distance of adjacent locating ribs of the same ring is ≤±0.10mm[2]). The measuring tools provided by the manufacturer cannot read the readings and cannot perform accurate data acceptance. The utility model provides a tool for quickly adjusting the chord distance of the small equal-divided ribs of the stator locating ribs.

[0006] In order to achieve the above-mentioned purpose, the utility model specifically adopts the following technical solutions:

[0007] A tool for quickly adjusting the chord distance of small equally divided stator positioning ribs comprises a ruler tail, one end of the ruler tail is fixedly connected with a ruler tail limiter, and the other end of the ruler tail is fixedly connected with a ruler head, the inner side of the ruler tail limiter is fixedly connected with a ruler tail fitting plate, and the ruler tail fitting plate is sleeved and fixed on a reference rib, the inner side of the ruler head is fixedly connected with a ruler head fitting plate, and the ruler head fitting plate is clamped and fixed to the positioning rib to be measured, the outer end of the ruler head is fixedly connected with a dial indicator, and the measuring end of the dial indicator abuts against the outer side of the positioning rib to be measured.

[0008] Furthermore, an extension rod is detachably connected between the ruler tail and the ruler head.

[0009] Furthermore, an angle adjustment docking clamp is provided on one side of the ruler head and the extension rod facing the ruler tail, and an angle adjustment connecting plug is fixedly connected to the ruler tail and one end of the extension rod facing the ruler head, the ruler tail, the extension rod and the ruler head are connected through the angle adjustment docking clamp and the plug-in tail of the angle adjustment connecting plug, and the ruler tail is threadedly connected to the center of the angle adjustment connecting plug corresponding to the ruler tail with an angle adjustment bolt of the ruler head fitting plate, and the extension rod is threadedly connected to the center of the angle adjustment connecting plug position corresponding to the ruler tail with a length adjustment bolt.

[0010] Furthermore, the inner sides of the ruler head bonding plate and the ruler tail bonding plate are provided with sleeve card slots, and the sleeve card slots match the outer end contour of the positioning rib.

[0011] Furthermore, the tail limiter overlaps with the outer end of the tail, and tail connection bolts are respectively inserted through the tail limiter and the tail, and the tail connection bolts penetrate through the tail limiter and the tail and are threadedly connected with a fastening nut.

[0012] The beneficial effects of the utility model are as follows:

[0013] 1. The utility model adjusts the inclination angle of the ruler head and the ruler tail according to the contour of the positioning rib. During the installation of the stator positioning rib, the chord distance of the positioning rib next to the selected reference rib is first adjusted, and the chord distance value is measured using an inside micrometer. Then, the device is used to clamp the ruler tail fitting plate on the outer wall of the reference rib, and the ruler head fitting plate is clamped on the outer wall of the positioning rib to be measured. Then, the measuring tool is used to read the relative value through the dial indicator at the same position. During the adjustment process, the relative values ​​of other positions are adjusted to achieve the purpose of quickly adjusting the stator positioning rib.

[0014] 2. The utility model is provided with an extension rod, which can extend the length of the ruler head. The extension rods of different lengths can be replaced according to the distance between the positioning ribs to be measured. The utility model is suitable for measuring the positioning ribs of different stator positioning ribs with small equal rib chord distances, thereby improving the application range of the device.

[0015] 3. The utility model provides an angle-adjustable docking clamp block and an angle-adjustable connecting plug block. The angle-adjustable docking clamp block is inserted into the angle-adjustable connecting plug block and is threadedly connected after the angle adjustment bolt and the length adjustment bolt are passed through the ruler head fitting plate to fix the ruler head and the extension rod. A gap is left between the outer end of the angle-adjustable docking clamp block and the ruler tail and the outer end of the extension rod. The inclination angles of the ruler head, the extension rod and the ruler tail can be adjusted through the inclination angles on both sides of the outer edge of the angle-adjustable docking clamp block, which facilitates the adjustment of the tool so that the tool conforms to the angle between adjacent positioning ribs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view of the utility model;

[0017] Figure 2 It is a top view of the utility model;

[0018] Figure 3 It is a side view of the utility model.

[0019] Figure numerals: 1. ruler tail; 2. ruler head fitting plate angle adjustment bolt; 3. ruler head; 4. ruler tail limiter; 5. ruler head fitting plate; 6. dial indicator; 7. ruler tail connecting bolt; 8. extension rod; 9. length adjustment bolt; 10. ruler tail fitting plate; 11. angle adjustment docking clamp; 12. angle adjustment connecting plug. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.

[0021] See also Figure 1 - Figure 3The utility model provides a tool for quickly adjusting the chord distance of small equally divided stator positioning ribs, comprising a ruler tail 1, one end of the ruler tail 1 is fixedly connected with a ruler tail limit 4, and the other end of the ruler tail 1 is fixedly connected with a ruler head 3, the inner side of the ruler tail limit 4 is fixedly connected with a ruler tail fitting plate 10, and the ruler tail fitting plate 10 is sleeved and fixed on the reference rib, the inner side of the ruler head 3 is fixedly connected with a ruler head fitting plate 5, and the ruler head fitting plate 5 is clamped and fixed with the positioning rib to be measured, the outer end of the ruler head 3 is fixedly connected with a dial indicator 6, and the measuring end of the dial indicator 6 is against the outer side of the positioning rib to be measured.

[0022] In this embodiment, preferably, an extension rod 8 is detachably connected between the ruler tail 1 and the ruler head 3; by setting the extension rod 8, the extension rod 8 can extend the length of the ruler head 3, and the extension rods 8 of different lengths can be replaced according to the distance between the positioning ribs to be measured, which is suitable for measuring the positioning ribs of different stator positioning ribs with small equal rib chord distances, thereby improving the application scope of the device.

[0023] In this embodiment, preferably, an angle adjustment docking clamp 11 is provided on one side of the ruler head 3 and the extension rod 8 facing the ruler tail 1, and an angle adjustment connection plug-in block 12 is fixedly connected to one end of the ruler tail 1 and the extension rod 8 facing the ruler head 3, the ruler tail 1, the extension rod 8 and the ruler head 3 are connected through the plug-in joint of the angle adjustment docking clamp 11 and the angle adjustment connection plug-in block 12, and the ruler tail 1 is threadedly connected to the ruler head laminating plate angle adjustment bolt 2 corresponding to the center of the angle adjustment connection plug-in block 12, and the extension rod 8 is threadedly connected to the length adjustment bolt 9 corresponding to the center of the angle adjustment connection plug-in block 12; by setting The angle adjustment docking clamp block 11 and the angle adjustment connecting plug block 12 are inserted into the angle adjustment connecting plug block 12 and penetrated through the angle adjustment bolt 2 and the length adjustment bolt 9 of the ruler head laminating plate and then threadedly connected to fix the ruler head 3 and the extension rod 8. A gap is left between the outer end of the angle adjustment docking clamp block 11 and the ruler tail 1 and the outer end of the extension rod 8. The inclination angles on both sides of the outer edge of the angle adjustment docking clamp block 11 can be adjusted to adjust the inclination angle between the ruler head 3 and the extension rod 8 and the ruler tail 1, so as to facilitate the adjustment of the tool so that the tool meets the angle between adjacent positioning ribs.

[0024] In this embodiment, preferably, sleeve card slots are opened on the inner sides of the ruler head bonding plate 5 and the ruler tail bonding plate 10, and the sleeve card slots match the outer contour of the positioning rib; through the set sleeve card slots, the sleeve card slots can be replaced to adapt to the positioning measurement of positioning ribs with different outer contours.

[0025] It should fit the contour of the positioning rib and have a certain adjustable angle due to angle issues. Taking the 550MW unit of Maer Hydropower Station as an example, the tail is designed according to the actual size of the on-site positioning rib, and the angle of the on-site stator positioning rib is measured.

[0026] The selection of the reading part, different units have different chord distance design values. Taking the 550MW unit of Maerdang Hydropower Station as an example, the number of stator positioning ribs is 126, and the angles of two adjacent positioning ribs are:

[0027] 360°÷126≈2.875°

[0028] The angle between two adjacent locating ribs is about 2.857 degrees, that is, 1.428 degrees is compensated on each side to ensure that there is no gap between the tooling and the locating ribs.

[0029] In this embodiment, preferably, the outer ends of the ruler tail limit 4 and the ruler tail 1 are staggered and overlapped, and the ruler tail limit 4 and the ruler tail 1 are respectively penetrated by ruler tail connecting bolts 7, which penetrate the ruler tail limit 4 and the ruler tail 1 and are threadedly connected with a fastening nut; through the set ruler tail connecting bolts 7, the ruler head 3 is connected to the ruler tail 1 or the extension rod 8 through the ruler head bonding plate angle adjustment bolt 2 or the length adjustment bolt 9, and the disassembly and assembly are also convenient, which is convenient for replacing different shapes of socket slots and ruler head bonding plates 5 and ruler tail bonding plates 10 according to different positioning rib contours.

[0030] The working principle and use process of the utility model are as follows: before using the device, the inclination angles of the ruler head 3 and the ruler tail 1 are adjusted according to the contour of the positioning rib. When the device is used, during the installation of the stator positioning rib, the chord distance of the positioning rib next to the selected reference rib is first adjusted, and the chord distance value is measured using an inside micrometer. Then, using the device, the ruler tail bonding plate 10 is clamped on the outer wall of the reference rib, and the ruler head bonding plate 5 is clamped on the outer wall of the positioning rib to be measured. Then, a measuring tool is used to read the relative value through a dial indicator at the same position. During the adjustment process, the relative values ​​of other positions are adjusted to achieve the purpose of quickly adjusting the stator positioning rib.

[0031] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those 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 will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A tool for quickly adjusting the chord distance of small equal-divided stator positioning ribs, characterized in that: The ruler comprises a ruler tail (1), one end of the ruler tail (1) is fixedly connected to a ruler tail limiter (4), and the other end of the ruler tail (1) is fixedly connected to a ruler head (3), the inner side of the ruler tail limiter (4) is fixedly connected to a ruler tail fitting plate (10), and the ruler tail fitting plate (10) is sleeved and fixed on a reference rib, the inner side of the ruler head (3) is fixedly connected to a ruler head fitting plate (5), and the ruler head fitting plate (5) is clamped and fixed to a positioning rib to be measured, and the outer end of the ruler head (3) is fixedly connected to a dial indicator (6), and the measuring end of the dial indicator (6) abuts against the outer side of the positioning rib to be measured.

2. A tool for quickly adjusting the chord distance of small equally divided stator positioning ribs according to claim 1, characterized in that: An extension rod (8) is detachably connected between the ruler tail (1) and the ruler head (3).

3. A tool for quickly adjusting the chord distance of small equally divided stator positioning ribs according to claim 2, characterized in that: The ruler head (3) and the extension rod (8) are provided with an angle adjustment docking clamp (11) on one side facing the ruler tail (1), and the ruler tail (1) and the extension rod (8) are fixedly connected with an angle adjustment connection plug-in block (12) on one end facing the ruler head (3); the ruler tail (1), the extension rod (8) and the ruler head (3) are connected via the plug-in joint of the angle adjustment docking clamp (11) and the angle adjustment connection plug-in block (12); the ruler tail (1) is connected with a ruler head laminating plate angle adjustment bolt (2) via a central thread corresponding to the angle adjustment connection plug-in block (12); and the extension rod (8) is connected with a length adjustment bolt (9) via a central thread corresponding to the angle adjustment connection plug-in block (12).

4. A tool for quickly adjusting the chord distance of small equally divided stator positioning ribs according to claim 1, characterized in that: The ruler head bonding plate (5) and the ruler tail bonding plate (10) are provided with sleeve card slots on their inner sides, and the sleeve card slots match the outer end contour of the positioning ribs.

5. A tool for quickly adjusting the chord distance of small equally divided stator positioning ribs according to claim 1, characterized in that: The ruler tail limiter (4) and the outer end of the ruler tail (1) are overlapped, and the ruler tail limiter (4) and the ruler tail (1) are respectively penetrated by ruler tail connecting bolts (7), and the ruler tail connecting bolts (7) penetrate the ruler tail limiter (4) and the ruler tail (1) and are threadedly connected with a fastening nut.

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