Ferrule type positioning mechanism for turbine static balance measurement

Abstract

A ferrule type positioning mechanism for turbine static balance measurement comprises a base which is fixedly installed on a pedestal of static balance measurement equipment. The upper cover is fixedly arranged on the upper part of the base; the plurality of positioning clamping blocks are uniformly distributed in an annular array by taking a measuring disc of the static balance measuring equipment as a center, each positioning clamping block comprises a moving handle which is slidably mounted between the base and the upper cover, a positioning part is arranged at the tail end of each moving handle, and each positioning part is positioned outside the base and the upper cover and is provided with a positioning arc; the driving mechanism is in transmission connection with the moving handle and is used for driving the moving handle to slide; wherein the plurality of moving handles slide to drive the plurality of positioning parts to move towards the center of the measuring disc at the same time, and a virtual circumference defined by the plurality of positioning arcs is matched with a cross section contour line of the turbine, so that ferrule type positioning from the outer side of the turbine is realized, the labor intensity is reduced, and the positioning precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of static balance measurement, in particular to a ferrule type positioning mechanism used for turbine static balance measurement. Background Art

[0002] When the static balance measurement of the existing axial flow turbine is performed, the position of the turbine relative to the measuring disk is usually adjusted manually by putting a ring on the top of the turbine so that its geometric center corresponds to the origin position of the measuring coordinate system of the static balance measuring equipment.

[0003] For turbines with large deviation in maximum outer diameter, many rings need to be made to match them when manually fitting the rings, which results in a lot of repetitive work and high labor intensity.

[0004] In addition, for turbines with straight-edged turbine blades and the same upper and lower diameters, the method of collaring from above is not only inconvenient to operate, but also affects the positioning accuracy.

[0005] Therefore, the existing positioning method has certain limitations and cannot properly correct the turbine position before static balance measurement. Utility Model Content

[0006] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a ring-type positioning mechanism for turbine static balance measurement, thereby realizing ring-type positioning from the outside of the turbine, reducing labor intensity and improving positioning accuracy.

[0007] The technical solution adopted by the utility model is as follows:

[0008] A ferrule type positioning mechanism for turbine static balance measurement, comprising

[0009] A base, wherein the base is fixedly mounted on a base of a static balance measuring device;

[0010] An upper cover, the upper cover is fixedly installed above the base;

[0011] A plurality of positioning clamps, the plurality of positioning clamps are evenly distributed in a circular array with the measuring disk of the static balance measuring device as the center, the positioning clamps include a moving handle slidably installed between the base and the upper cover, a positioning part is arranged at the end of the moving handle, the positioning part is located outside the base and the upper cover, and is provided with a positioning arc;

[0012] A driving mechanism, the driving mechanism is in transmission connection with the moving handle and is used to drive the moving handle to slide;

[0013] The sliding of the plurality of movable handles drives the plurality of positioning parts to move toward the center of the measuring disk at the same time, and the virtual circle formed by the plurality of positioning arcs matches a cross-sectional contour line of the turbine.

[0014] As a further improvement of the above technical solution:

[0015] It also includes a calibration rotor, which is a rotating body. The center of gravity and the geometric center of the calibration rotor are both located on the central axis. The outer diameter of the calibration rotor at a position corresponding to the positioning arc matches the cross-sectional contour line of the turbine.

[0016] The structure of the base is as follows: it comprises an annular body, the annular body is fixedly mounted on the base, and the measuring disc is located in the inner ring of the annular body;

[0017] The upper surface of the annular body is also provided with a plurality of slide grooves, and a single slide groove is slidably matched with a single moving handle.

[0018] The upper surface of the annular body is provided with an annular groove, and the center of the annular groove corresponds to the center of the measuring disk;

[0019] The structure of the driving mechanism includes: a central rotating disk, an annular structure matching the annular groove, the central rotating disk is rotatably installed in the annular groove, and the central rotating disk is drivingly connected to the moving handle.

[0020] The central turntable is provided with a plurality of guide holes, the plurality of movable handles correspond to the plurality of guide holes one by one, and the movable handles are provided with guide shafts which are slidably matched with the guide holes.

[0021] The guide hole is an arc-shaped oblong hole, one end of the guide hole is at a distance R1 from the center of the center turntable, and one end of the guide hole is at a distance R2 from the center of the center turntable, and R1 is smaller than R2.

[0022] The side wall of the annular groove is provided with a plurality of bearings matched with the central rotating disk.

[0023] The driving mechanism also includes a rotating handle, which is rotatably mounted on the upper cover, and the end of the rotating handle is located below the upper cover. A rack is provided on the central turntable, and a gear meshing with the rack is provided at the end of the rotating handle. Rotating the rotating handle drives the central turntable to rotate.

[0024] The moving handle and the positioning portion are detachably connected.

[0025] The upper cover is provided with a notch corresponding to the connection portion between the moving handle and the positioning portion, the positioning portion is connected to the moving handle via a pin, and the positioning portion is located above the moving handle;

[0026] It further includes a disassembly and assembly device. The disassembly and assembly device includes a plurality of support blocks corresponding to the notches. The disassembly and assembly device further includes an auxiliary handle. One end of the auxiliary handle is located above the support block. The middle part of the support block is slidably connected to the support block. The lower end of the auxiliary handle is a stud corresponding to the screw hole on the positioning part.

[0027] The beneficial effects of the present utility model are as follows:

[0028] The structure of the present utility model is compact and reasonable, and the operation is convenient. By slidably installing a plurality of positioning clamping blocks between the base and the upper cover of the static balance measuring device, and driving the plurality of positioning clamping blocks to move through the driving mechanism, the positioning arcs on the plurality of positioning clamping blocks form a collar matching the cross-sectional contour line from the side of the turbine, thereby changing the position of the turbine relative to the measuring disc, so as to realize the ring-type positioning from the outside of the turbine, reduce the labor intensity and improve the positioning accuracy.

[0029] The present utility model further has the following advantages:

[0030] (1) By arranging a plurality of arc-shaped long circular holes with the same inclination direction on the self-rotating central turntable, arranging a guide shaft on the moving handle, and adopting the shaft-hole matching method, the rotation of the central turntable is converted into the sliding of the moving handle in the sliding groove, with a simple structure, reducing the manufacturing cost and occupied space of the driving mechanism.

[0031] (2) The positioning clamping block is set as a split structure, and the moving handle and the positioning part are detachably connected, which is convenient for replacing positioning clamping blocks of different specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic structural diagram of the present utility model.

[0033] Figure 2 is an exploded view of the present utility model.

[0034] Figure 3 is a partial cross-sectional view of the present utility model.

[0035] Figure 4 is Figure 3 the partial enlarged view at A in

[0036] Figure 5 is a schematic structural diagram of the base and related structures of the present utility model.

[0037] Figure 6 is a schematic structural diagram of the central turntable of the present utility model.

[0038] Figure 7 is a schematic structural diagram of the positioning clamping block of the present utility model.

[0039] Figure 8Structural schematic diagram of the positioning clamp block of the present utility model (from another perspective).

[0040] Figure 9 Structural schematic diagram of the upper cover and related structures of the present utility model.

[0041] Wherein:

[0042] 1. Base; 11. Measuring disk; 12. Support body;

[0043] 2. Calibration rotor;

[0044] 3. Positioning clamp block; 31. Positioning part; 32. Moving handle; 33. Guide shaft; 34. Pin shaft; 35. Screw hole; 36. Fastener;

[0045] 4. Driving mechanism; 41. Rotating handle; 411. Gear; 42. Central turntable; 421. Guide hole; 422. Rack;

[0046] 5. Upper cover; 51. Notch;

[0047] 6. Disassembly and assembly device; 61. Auxiliary handle; 62. Support block;

[0048] 7. Base; 71. Ring-shaped body; 72. Bearing; 73. Slide groove. Detailed implementation mode

[0049] The following combines with the attached drawings to illustrate the detailed implementation mode of the present utility model.

[0050] Embodiment 1:

[0051] As Figures 1-4 shown, the ferrule-type positioning mechanism for turbine static balance measurement in this embodiment includes a base 7, an upper cover 5, a plurality of positioning clamp blocks 3 and a driving mechanism 4.

[0052] The base 7 is fixedly installed on the base 1 of the static balance measurement device.

[0053] The upper cover 5 is fixedly installed above the base 7.

[0054] A plurality of positioning clamp blocks 3 are evenly distributed in a circular array centered on the measuring disk 11 of the static balance measurement device. The positioning clamp block 3 includes a moving handle 32 slidably installed between the base 7 and the upper cover 5. A positioning part 31 is provided at the end of the moving handle 32. The positioning part 31 is located outside the base 7 and the upper cover 5 and is provided with a positioning arc.

[0055] The driving mechanism 4 is in transmission connection with the moving handle 32 and is used to drive the moving handle 32 to slide.

[0056] Among them, multiple moving handles 32 slide to drive multiple positioning parts 31 to move towards the center of the dial 11 simultaneously. The virtual circumference formed by enclosing multiple positioning arcs matches the cross-sectional contour line of the turbine.

[0057] Specifically, the dial 11 is the main measuring device of the static balance measuring equipment. During measurement, the dial 11 is not connected to the base 7 and the upper cover 5. The circumference formed by enclosing multiple positioning arcs can be a non-closed structure. When the positioning parts 31 move towards the center of the dial 11 simultaneously, they push the turbine, changing the position of the turbine relative to the dial 11. When the multiple positioning parts 31 clamp the turbine, the position of the turbine is determined, making the geometric center of the turbine coincide with the measuring coordinate center point of the dial 11.

[0058] By slidably installing multiple positioning blocks 3 between the base 1 and the upper cover 5 of the static balance measuring equipment, and driving the multiple positioning blocks 3 to move through the driving mechanism 4, the positioning arcs on the multiple positioning blocks 3 form a collar matching the cross-sectional contour line from the side of the turbine, thereby changing the position of the turbine relative to the dial 11, so as to achieve ring-type positioning from the outside of the turbine, reducing labor intensity and improving positioning accuracy.

[0059] The ring-type positioning mechanism for turbine static balance measurement in this embodiment further includes a calibration rotor 2. The calibration rotor 2 is a rotating body. The center of gravity and the geometric center of the calibration rotor 2 are both located on the central axis of the calibration rotor 2. The outer diameter of the calibration rotor 2 at the position corresponding to the positioning arc matches the cross-sectional contour line of the turbine. A support 12 for supporting the calibration rotor 2 and the turbine is provided on the dial 11.

[0060] Specifically, the "cross-sectional contour line of the turbine" is the contact position between the moving handle 32 and the turbine when positioning the turbine. For a non-full-backplate turbine, this position is on the fins of the turbine. The calibration rotor 2 is close to the turbine in weight. "The outer diameter of the calibration rotor 2 at the position corresponding to the positioning arc matches the cross-sectional contour line of the turbine" is used to debug the position of the positioning part 31 relative to the center of the measuring coordinate system of the static balance measuring equipment, thereby ensuring the positioning accuracy of the positioning tooling. When the multiple positioning parts 31 clamp the turbine, the position of the turbine satisfies that the geometric center of the turbine coincides with the measuring coordinate center point of the dial 11.

[0061] Next, the working mode of the ring-type positioning mechanism is introduced.

[0062] I. Debugging and calibration of the positioning mechanism:

[0063] Place the calibration rotor 2 on the support 12;

[0064] Start the driving mechanism 4 to drive the multiple positioning parts 31 to move towards the center of the dial 11, so that the positioning arcs act on the calibration rotor 2, clamp the calibration rotor 2, and change the position of the calibration rotor 2 on the support 12;

[0065] After starting the driving mechanism 4 to drive the plurality of positioning parts 31 to move reversely, start the static balance measuring device to measure the static unbalance amount of the calibration rotor 2. According to the coordinate data fed back by the measuring device, adjust the position of the base 7 on the base 1, and repeat the above process until the geometric center of the calibration rotor 2 coincides with the center point of the measurement coordinates fed back by the device, thus completing the calibration process.

[0066] II. Static unbalance amount measurement:

[0067] Place the turbine on the support 12;

[0068] Start the driving mechanism 4 to drive the plurality of positioning parts 31 to move towards the center of the dial 11, so that the positioning arc acts on the turbine and clamps the turbine, and determine the position of the turbine on the support 12. At this time, the geometric center of the turbine coincides with the center point of the measurement coordinates fed back by the device;

[0069] After starting the driving mechanism 4 to drive the plurality of positioning parts 31 to move reversely, start the static balance measuring device to measure the static unbalance amount of the turbine.

[0070] Furthermore, as Figure 3 、 Figure 5 shown, the structure of the base 7 includes an annular body 71, the annular body 71 is fixedly installed on the base 1, and the dial 11 is located in the inner ring of the annular body 71;

[0071] The upper surface of the annular body 71 is further provided with a plurality of sliding grooves 73, and each sliding groove 73 is slidably matched with a single moving handle 32.

[0072] Specifically, the upper cover 5 and the sliding groove 73 form a sliding channel matching the moving handle 32, and at the same time limit the up and down displacement of the moving handle 32.

[0073] Embodiment 2:

[0074] On the basis of Embodiment 1, further refine the structure of the driving mechanism 4.

[0075] Furthermore, as Figures 2-5 shown, the upper surface of the annular body 71 is provided with an annular groove, and the center of the annular groove corresponds to the center of the dial 11;

[0076] The structure of the driving mechanism 4 includes: a central turntable 42, an annular structure of the central turntable 42 matching the annular groove, the central turntable 42 is rotatably installed in the annular groove, and the central turntable 42 is in transmission connection with the moving handle 32.

[0077] Specifically, the central turntable 42 is located below the moving handle 32 to ensure that the rotation of the central turntable 42 and the sliding of the moving handle 32 do not interfere with each other; the rotation mode of the central turntable 42 is to rotate self in the circular groove.

[0078] Further, a plurality of guide holes 421 are provided on the central turntable 42. The plurality of moving handles 32 correspond to the plurality of guide holes 421 one by one. A guide shaft 33 that is slidably engaged with the guide hole 421 is provided on the moving handle 32. The end of the guide shaft 33 is located in the guide hole 421, and the guide holes 421 are uniformly distributed in an annular array centered on the center of the central turntable 42.

[0079] The guide hole 421 is an arc-shaped oblong hole. The distance from one end of the guide hole 421 to the center of the central turntable 42 is R1, and the distance from the other end of the guide hole 421 to the center of the central turntable 42 is R2, and R1 is less than R2.

[0080] The principle of the driving mechanism 4 driving the moving handle 32 to perform a linear motion in the sliding groove 73 is as follows:

[0081] The degree of freedom of the moving handle 32 is restricted by the sliding groove 73 and can only move in a direction close to or away from the center of the measuring disc 11. The guide shaft 33 on the moving handle 32 is located in the guide hole 421. When the central turntable 42 rotates, the position of the guide shaft 33 in the guide hole 421 changes. Since the distances from the two ends of the guide hole 421 to the center of the central turntable 42 are different, when the guide shaft 33 is in different positions in the guide hole 421, the distance between the moving handle 32 and the center of the central turntable 42 is different. Furthermore, the rotation of the central turntable 42 drives the moving handle 32 to move in the sliding groove 73. The arc inclination directions of the plurality of guide holes 421 are the same and are uniformly distributed in an annular array centered on the center of the central turntable 42, so that when the central turntable 42 rotates, the plurality of moving handles 32 rotate synchronously, and the positioning portion 31 moves towards the center of the measuring disc 11 to clamp and calibrate the rotor 2 or the turbine.

[0082] By providing a plurality of arc-shaped oblong holes with the same inclination direction on the rotating central turntable 42 and providing a guide shaft 33 on the moving handle 32, and adopting a shaft-hole cooperation method, the rotation of the central turntable 42 is converted into the sliding of the moving handle 32 in the sliding groove 73. The structure is simple, and the manufacturing cost and occupied space of the driving mechanism 4 are reduced.

[0083] Further, as Figure 5 shown, a plurality of bearings 72 cooperating with the central turntable 42 are provided on the side wall of the annular groove.

[0084] The driving mechanism 4 further includes a rotating handle 41. The rotating handle 41 is rotatably installed on the upper cover 5. The end of the rotating handle 41 is located below the upper cover 5. A rack 422 is provided on the central turntable 42, and a gear 411 meshing with the rack 422 is provided at the end of the rotating handle 41. Rotating the rotating handle 41 drives the central turntable 42 to rotate.

[0085] Specifically, as Figure 6As shown, a bearing 72 is provided on the inner ring side wall of the annular groove, which is fitted with the inner ring of the central turntable 42; the rack 422 is a partial structure located on the outer ring of the central turntable 42.

[0086] Embodiment 3:

[0087] After debugging and calibration of the ring-type positioning mechanism for turbine static balance measurement, the positioning clamp block 3 can be replaced according to turbines of different specified diameters for the measurement of turbine static unbalance. In order to facilitate the replacement of positioning clamp blocks 3 of different specifications without disassembling the upper cover 5, in this embodiment, on the basis of Embodiments 1 and 2, further, the positioning clamp block 3 is set as a split structure, as Figure 4 、 Figure 7 、 Figure 8 shown, the moving handle 32 and the positioning part 31 are detachably connected.

[0088] As Figure 2 、 Figure 9 shown, the upper cover 5 is provided with a notch 51 corresponding to the connection parts of the moving handle 32 and the positioning part 31. The positioning part 31 and the moving handle 32 are connected by a pin shaft 34, and the positioning part 31 is located above the moving handle 32;

[0089] It further includes a disassembly and assembly device 6. The disassembly and assembly device 6 includes a plurality of support blocks 62, and the support blocks 62 correspond to the notches 51. The disassembly and assembly device 6 further includes an auxiliary handle 61. One end of the auxiliary handle 61 is located above the support blocks 62. The middle part of the support block 62 is slidably connected to the support block 62. The lower end of the auxiliary handle 61 is a stud, and the stud corresponds to the threaded hole 35 on the positioning part 31.

[0090] Specifically, there are two pin shafts 34, which are arranged along the length direction perpendicular to the positioning part 31, for quickly positioning and connecting the positioning part 31 and the moving handle 32 to ensure the structural accuracy of the split-type positioning clamp block 3. After the positioning part 31 and the moving handle 32 are positioned and connected, fasteners 36 can be used to fixedly connect the positioning part 31 and the moving handle 32.

[0091] The threaded hole 35 is located between the two pin shafts 34. When the moving handle 32 needs to be replaced, after removing the fasteners 36, the stud at the lower end of the auxiliary handle 61 is passed through the support block 62 and threadedly connected to the threaded hole 35. Under the guidance of the support block 62, the moving handle 32 is pulled upward to remove the moving handle 32.

[0092] Taking the non-full-backplate turbine with DN80 as an example, the replacement of the positioning clamp block 3 is described as follows:

[0093] First, classify the cross-sectional contour lines of the DN80 turbine into three size ranges of 79.85 - 79.9, 79.9 - 80.0, and 80.05 - 80.1. The above sizes all meet the tolerance requirements of the turbine. Three types of positioning parts 31 are prepared respectively for the above classifications;

[0094] After measuring the unbalance of the first type of turbine, replace the positioning part 31 and measure other types of turbines.

[0095] The above description is an explanation of the present utility model, not a limitation thereof. The scope defined by the present utility model is referred to the claims. Any form of modification can be made within the protection scope of the present utility model.

Claims

1. A ferrule-type positioning mechanism for turbine static balance measurement, characterized in that: including a base (7), the base (7) being fixedly installed on a base (1) of a static balance measuring device; an upper cover (5), the upper cover (5) being fixedly installed above the base (7); a plurality of positioning clamping blocks (3), the plurality of positioning clamping blocks (3) being evenly distributed in a circular array centered on a measuring disc (11) of the static balance measuring device, the positioning clamping block (3) including a moving handle (32) slidably installed between the base (7) and the upper cover (5), a positioning portion (31) being provided at the end of the moving handle (32), the positioning portion (31) being located outside the base (7) and the upper cover (5) and provided with a positioning arc; a driving mechanism (4), the driving mechanism (4) being in transmission connection with the moving handle (32) for driving the moving handle (32) to slide; wherein, the plurality of moving handles (32) slide to drive the plurality of positioning portions (31) to move simultaneously towards the center of the measuring disc (11), and a virtual circumference formed by enclosing the plurality of positioning arcs matches a cross-sectional contour line of the turbine.

2. The ferrule-type positioning mechanism for turbine static balance measurement according to claim 1, characterized in that: further comprising a calibration rotor (2), the calibration rotor (2) being a rotary body, the center of gravity and the geometric center of the calibration rotor (2) being both located on the central axis, and the outer diameter of the calibration rotor (2) at a position corresponding to the positioning arc matching the cross-sectional contour line of the turbine.

3. The ferrule-type positioning mechanism for turbine static balance measurement according to claim 1, characterized in that: the structure of the base (7) is such that it includes an annular body (71), the annular body (71) being fixedly installed on the base (1), and the measuring disc (11) being located in the inner ring of the annular body (71); a plurality of sliding grooves (73) are further provided on the upper surface of the annular body (71), and a single sliding groove (73) is slidably engaged with a single moving handle (32).

4. The ferrule-type positioning mechanism for turbine static balance measurement according to claim 3, characterized in that: a circular groove is provided on the upper surface of the annular body (71), and the center of the circular groove corresponds to the center of the measuring disc (11); the structure of the driving mechanism (4) includes: a central turntable (42), the central turntable (42) having an annular structure matching the circular groove, the central turntable (42) being rotatably installed in the circular groove, and the central turntable (42) being in transmission connection with the moving handle (32).

5. The ferrule type positioning mechanism for turbine static balance measurement according to claim 4, characterized in that: a plurality of guiding holes (421) are provided on the central turntable (42), the plurality of moving handles (32) correspond to the plurality of guiding holes (421) one by one, and a guiding shaft (33) slidably engaged with the guiding hole (421) is provided on the moving handle (32).

6. The ferrule type positioning mechanism for turbine static balance measurement according to claim 5, characterized in that: the guiding hole (421) is an arc-shaped long circular hole, the distance from one end of the guiding hole (421) to the center of the central turntable (42) is R1, and the distance from the other end of the guiding hole (421) to the center of the central turntable (42) is R2, and R1 is less than R2.

7. The ferrule type positioning mechanism for turbine static balance measurement according to claim 4, characterized in that: The side wall of the annular groove is provided with a plurality of bearings (72) that cooperate with the central turntable (42).

8. The ferrule type positioning mechanism for turbine static balance measurement according to claim 4, characterized in that: The driving mechanism (4) further includes a rotating handle (41). The rotating handle (41) is rotatably mounted on the upper cover (5). The end of the rotating handle (41) is located below the upper cover (5). A rack (422) is provided on the central turntable (42). A gear (411) that meshes with the rack (422) is provided at the end of the rotating handle (41). Rotating the rotating handle (41) drives the central turntable (42) to rotate self - clockwise.

9. The ferrule type positioning mechanism for turbine static balance measurement according to claim 1, wherein: The moving handle (32) and the positioning portion (31) are detachably connected.

10. The ferrule type positioning mechanism for turbine static balance measurement according to claim 9, characterized in that: A notch (51) corresponding to the connection part of the moving handle (32) and the positioning portion (31) is provided on the upper cover (5). The positioning portion (31) and the moving handle (32) are connected by a pin shaft (34). The positioning portion (31) is located above the moving handle (32). It further includes a disassembly and assembly device (6). The disassembly and assembly device (6) includes a plurality of support blocks (62). The support blocks (62) correspond to the notches (51). The disassembly and assembly device (6) further includes an auxiliary handle (61). One end of the auxiliary handle (61) is located above the support blocks (62). The middle of the support blocks (62) is slidably connected to the support blocks (62). The lower end of the auxiliary handle (61) is a stud, and the stud corresponds to a threaded hole (35) on the positioning portion (31).

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