Full-back-plate turbine static balance measuring and positioning tool

Abstract

A full-back-plate turbine static balance measuring and positioning tool comprises a driving seat, a driving part, a mounting table, a plurality of guide grooves and a plurality of chuck assemblies, the driving seat is fixedly mounted on a base of static balance measuring equipment, and a measuring disc of the static balance measuring equipment is located in the middle of the driving seat; the driving piece is rotationally mounted on the driving seat; the mounting table is fixedly mounted on the driving seat, and the driving piece is located between the mounting table and the driving seat; the multiple guide grooves are located in the upper surface of the mounting table and are evenly distributed in an annular array with the measuring disc as the center. The chuck assemblies are in one-to-one correspondence with the guide grooves, the chuck assemblies are in sliding connection with the guide grooves, and each chuck assembly is provided with a chuck piece facing the measuring disc; wherein the driving part is in transmission connection with the plurality of chuck assemblies, and is used for driving the chuck parts of the plurality of chuck assemblies to move to the measuring disc at the same time, and carrying out circumferential multi-point positioning on a calibration rotor or a full-back-plate turbine on the measuring disc, so that the positioning precision of the turbine is improved, and high-precision repeated measurement of the static balance of the turbine with relatively large weight and appearance deviation is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of static balance measurement, in particular to a static balance measurement and positioning tooling for a full-backplate turbine. Background Art

[0002] When measuring the static balance of an existing axial-flow turbine, the positioning of the turbine on the static balance measurement device is mainly achieved through a pressing-down positioning method and a ferrule positioning method.

[0003] When the pressing-down positioning method is used for a turbine with a weight exceeding 200 g, its repeated positioning accuracy will drop linearly, and it is impossible to correct the deviation of the turbine well.

[0004] When the ferrule positioning method is used for a turbine with a large deviation in the maximum outer diameter of the turbine, many ferrules need to be made for matching. The more the number of ferrules, the greater the influence on the accuracy of the entire measurement system. Research shows that when the number of ferrules exceeds three, it will have a greater impact on the final measurement result.

[0005] Therefore, the existing turbine positioning methods have low accuracy and cannot meet the high-precision repeated measurement of the static balance of turbines with large weight and shape deviations. Summary of the Utility Model

[0006] The applicant of the present utility model aims at the above-mentioned disadvantages in the existing production technology and provides a static balance measurement and positioning tooling for a full-backplate turbine, so as to improve the positioning accuracy of the turbine and realize the high-precision repeated measurement of the static balance of turbines with large weight and shape deviations.

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

[0008] A static balance measurement and positioning tooling for a full-backplate turbine, comprising

[0009] A driving seat, which is fixedly installed on the base of the static balance measurement device, and the measuring disk of the static balance measurement device is located in the middle of the driving seat;

[0010] A driving member, which is rotatably installed on the driving seat;

[0011] An installation table, which is fixedly installed on the driving seat, and the driving member is located between the installation table and the driving seat;

[0012] A plurality of guiding grooves, which are located on the upper surface of the installation table, and the plurality of guiding grooves are evenly distributed in a circular array centered on the measuring disk;

[0013] A plurality of chuck assemblies, which correspond to the guiding grooves one by one, are slidably connected with the guiding grooves, and each chuck assembly is provided with a chuck member facing the measuring disk;

[0014] Wherein, the driving member is drivingly connected to a plurality of chuck assemblies, and is used to drive the chucks of the plurality of chuck assemblies to move towards the measuring disc simultaneously, so as to perform circumferential multi-point positioning on the calibrated rotor or the full-backplane turbine on the measuring disc.

[0015] As a further improvement of the above technical solution:

[0016] The calibrated rotor is a rotating body with its center of gravity and geometric center both located on the central axis.

[0017] The structure of the chuck assembly is as follows: it includes a substrate, the substrate is slidably matched with the guiding groove, the chuck is installed on the substrate, a driven shaft is installed below the substrate, and the driven shaft passes through the bottom of the guiding groove and is drivingly connected to the driving member.

[0018] The substrate is further provided with a guiding seat, a limiting seat and an elastic member. The chuck is slidably installed on the guiding seat. One end of the chuck faces the measuring disc, and the other end of the chuck is connected to the limiting seat through the elastic member. The elastic member is in a compressed state, and a positioning member for fixing the relative position between the chuck and the guiding seat is arranged on the guiding seat.

[0019] The elastic member is a spring.

[0020] The driving member is in a circular ring shape, and guiding holes drivingly connected to the chuck assemblies are arranged on the driving member. When the driving member rotates, it drives the chuck assemblies to slide in the guiding groove.

[0021] The number of the guiding holes is multiple and corresponds to the chuck assemblies one by one. The structure of a single guiding hole is an arc-shaped long circular hole. The distance from one end of the guiding hole to the center of the driving member is L1, and the distance from the other end of the guiding hole to the center of the driving member is L2, and L1 is greater than L2.

[0022] The upper surface of the driving seat is provided with an annular sunk groove for cooperating with the driving member, and the driving member is rotatably installed in the annular sunk groove.

[0023] It further includes a handle. An avoidance groove is arranged on one side of the annular sunk groove. The head end of the handle is fixedly connected to the driving member, the tail end of the handle is located outside the driving seat, and the middle part of the handle is located in the avoidance groove.

[0024] The number of the guiding grooves is three.

[0025] The beneficial effects of the present utility model are as follows:

[0026] The utility model has a compact and reasonable structure and is convenient to operate. By installing a positioning mechanism on the base of the static balance measuring device, the chuck assemblies uniformly distributed in an annular array centered on the measuring disc are driven by a driving mechanism to move, so as to perform circumferential multi-point positioning on the calibrated rotor or the full-backplate turbine. The calibrated rotor is used to calibrate the moving position of the chuck assemblies to ensure the accuracy of the placement position during the measurement of the full-backplate turbine, thereby improving the positioning accuracy of the turbine and realizing the high-precision repeated measurement of the static balance of the turbine with large weight and shape deviations.

[0027] The utility model also has the following advantages:

[0028] (1) By arranging a plurality of arc-shaped long round holes with the same inclination direction on the rotating circular ring-shaped driving part and arranging a driven shaft on the chuck assembly, and adopting the shaft-hole matching method, the rotation of the driving part is converted into the sliding of the chuck assembly in the guiding groove. The structure is simple, and the manufacturing cost and occupied space of the driving mechanism are reduced.

[0029] (2) By adjusting the compression amount of the elastic part, the relative position relationship between the chuck part and the substrate is adjusted, and then the centers of the circumferences where the ends of the plurality of chuck parts face the measuring disc are finely adjusted to correspond to the coordinate center point fed back by the device, so as to ensure that the geometric center of the calibrated rotor coincides with the coordinate center point fed back by the device and complete the calibration process. Description of the Drawings

[0030] Figure 1 is a schematic structural diagram of the utility model.

[0031] Figure 2 is a schematic structural diagram (partial cross-section) of the utility model.

[0032] Figure 3 is an exploded view of the schematic structural diagram of the utility model.

[0033] Figure 4 is a schematic structural diagram of the positioning mechanism of the utility model.

[0034] Figure 5 is a cross-sectional view of the utility model.

[0035] Figure 6 is Figure 5 the partial enlarged view at A in

[0036] Figure 7 is a schematic diagram of the fine adjustment of the chuck part of the utility model.

[0037] Figure 8 is a schematic structural diagram of the chuck assembly of the utility model.

[0038] Figure 9 is a schematic structural diagram of the mounting table of the utility model.

[0039] Figure 10 This is a schematic structural diagram of the driving member of the present utility model.

[0040] Among them:

[0041] 1. Positioning mechanism;

[0042] 11. Installation table; 12. Guide groove;

[0043] 13. Chuck assembly; 131. Chuck part; 132. Guide seat; 133. Positioning part; 134. Elastic part; 135. Limit seat; 136. Limit shaft; 137. Substrate; 138. Driven shaft;

[0044] 14. Avoidance hole;

[0045] 2. Driving mechanism;

[0046] 21. Handle;

[0047] 22. Driving part; 221. Guide hole;

[0048] 23. Driving seat; 231. Annular sunk groove; 232. Avoidance groove;

[0049] 3. Base; 31. Measuring disk; 32. Support body;

[0050] 4. Calibration rotor; 5. Full-backplate turbine; 51. Full-backplate outer circumference. Specific implementation mode

[0051] The following combines the drawings to illustrate the specific implementation mode of the present utility model.

[0052] Embodiment 1:

[0053] As Figures 1 - 3 shown, the full-backplate turbine static balance measurement and positioning tooling of this embodiment includes a driving mechanism 2 installed on a base 3 of a static balance measurement device, and a positioning mechanism 1 is installed on the driving mechanism 2.

[0054] The driving mechanism 2 includes a driving seat 23 and a driving part 22.

[0055] The driving seat 23 is fixedly installed on the base 3 of the static balance measurement device, and the measuring disk 31 of the static balance measurement device is located in the middle of the driving seat 23; the driving part 22 is rotatably installed on the driving seat 23.

[0056] The positioning mechanism 1 includes an installation table 11, a plurality of guide grooves 12 and a plurality of chuck assemblies 13.

[0057] The mounting table 11 is fixedly installed on the driving seat 23, and the driving member 22 is located between the mounting table 11 and the driving seat 23; a plurality of guide grooves 12 are located on the upper surface of the mounting table 11, and the plurality of guide grooves 12 are uniformly distributed in a circular array centered on the measuring disc 31; the chuck assemblies 13 correspond to the guide grooves 12 one by one, the chuck assemblies 13 are slidably connected to the guide grooves 12, and each chuck assembly 13 is provided with a chuck member 131 facing the measuring disc 31.

[0058] Among them, the driving member 22 is in transmission connection with the plurality of chuck assemblies 13, and is used to drive the chuck members 131 of the plurality of chuck assemblies 13 to move towards the measuring disc 31 simultaneously, so as to perform circumferential multi-point positioning on the calibration rotor 4 or the full-backplate turbine 5 on the measuring disc 31.

[0059] The calibration rotor 4 is a rotating body with its center of gravity and geometric center both located on the central axis of the calibration rotor 4.

[0060] Specifically, the calibration rotor 4 or the full-backplate turbine 5 is placed on the support 32 on the measuring disc 31. The measuring disc 31 is the main measuring device of the static balance measuring equipment, and the measuring disc 31 is not connected to the positioning mechanism 1 and the driving mechanism 2 during measurement; the calibration rotor 4 is a rotating body, and its shape and weight are close to those of the full-backplate turbine 5, and it is used to debug the moving position of the chuck member 131 in the positioning tooling to ensure the positioning accuracy of the positioning tooling. When measuring the static unbalance of the full-backplate turbine 5, after the chuck member 131 moves and adjusts the position of the full-backplate turbine 5 on the support 32, the geometric center of the full-backplate turbine 5 and the measuring coordinate center point of the measuring disc 31 are made to coincide.

[0061] The chuck member 131 corresponds to the full-backplate outer circumference 51 of the full-backplate turbine 5. The contact mode between the chuck member 131 and the calibration rotor 4 or the full-backplate turbine 5 is point contact, and the ends of the plurality of chuck members 131 facing the measuring disc 31 are located on the same circumferential line.

[0062] Next, the working mode of the positioning tooling will be introduced.

[0063] I. Debugging and calibration of the positioning tooling:

[0064] Place the calibration rotor 4 on the support 32, rotate the driving member 22, the driving member 22 drives the chuck assembly 13 to slide in the guide groove 12, the chuck member 131 moves towards the calibration rotor 4, the chuck member 131 touches the calibration rotor 4, and the calibration rotor 4 slides on the support 32 until the chuck members 131 all contact the calibration rotor 4 and then clamp the calibration rotor 4, and the position of the calibration rotor 4 on the support 32 is determined;

[0065] Reverse-rotate the driving member 22, and the driving member 22 drives the chuck assembly 13 to slide in the guiding groove 12. The chuck member 131 moves in a direction away from the calibrated rotor 4, and the chuck member 131 is not in contact with the calibrated rotor 4. Start the static balance measuring device to measure the static unbalance of the calibrated rotor 4. According to the coordinate data fed back by the measuring device, adjust the positions of the plurality of chuck members 131 relative to the center of the dial 31. Repeat the above process until the geometric center of the calibrated rotor 4 coincides with the center point of the measurement coordinates fed back by the device, and the calibration process is completed.

[0066] II. Measurement of static unbalance:

[0067] Remove the calibrated rotor 4 and place the full-backplate turbine 5 on the support 32;

[0068] Rotate the driving member 22, and the driving member 22 drives the chuck assembly 13 to slide in the guiding groove 12. The chuck member 131 moves towards the full-backplate turbine 5 until it clamps the full-backplate turbine 5. At this time, the geometric center of the full-backplate turbine 5 coincides with the center point of the measurement coordinates fed back by the device;

[0069] Reverse-rotate the driving member 22, and the driving member 22 drives the chuck assembly 13 to slide in the guiding groove 12. The chuck member 131 moves in a direction away from the full-backplate turbine 5. Start the static balance measuring device to measure the static unbalance of the full-backplate turbine 5, and one measurement is completed.

[0070] By installing the positioning mechanism 1 on the base 3 of the static balance measuring device and driving the chuck assemblies 13 evenly distributed in a circular array centered on the dial 31 through the driving mechanism 2 to move, circumferential multi-point positioning is performed on the calibrated rotor 4 or the full-backplate turbine 5. The calibrated rotor 4 is used to calibrate the moving position of the chuck assembly 13 to ensure the accuracy of the placement position of the full-backplate turbine 5 during measurement, thereby improving the positioning accuracy of the turbine and realizing high-precision repeated measurement of the static balance of turbines with large weight and shape deviations.

[0071] Embodiment 2:

[0072] Based on Embodiment 1, this embodiment further refines the structures and functions of the positioning mechanism 1 and the driving mechanism 2.

[0073] As Figures 4 - 8 shown, the structure of the chuck assembly 13 is: including a substrate 137, the substrate 137 is slidably matched with the guiding groove 12, a chuck member 131 is installed on the substrate 137, and a driven shaft 138 is installed below the substrate 137. The driven shaft 138 passes through the bottom of the guiding groove 12 and is in transmission connection with the driving member 22.

[0074] Specifically, a bearing is provided at the end of the driven shaft 138 and is located in the guiding hole 221 of the driving member 22; As Figure 9As shown, an avoidance hole 14 corresponding to the driven shaft 138 is provided at the bottom of the guide groove 12.

[0075] Furthermore, a guide seat 132, a limit seat 135 and an elastic member 134 are also provided on the substrate 137. The chuck member 131 is slidably mounted on the guide seat 132. One end of the chuck member 131 faces the dial 31, and the other end of the chuck member 131 is connected to the limit seat 135 through the elastic member 134. The elastic member 134 is in a compressed state. A positioning member 133 for fixing the relative position between the chuck member 131 and the guide seat 132 is provided on the guide seat 132.

[0076] Specifically, the elastic member 134 is a spring, and the positioning member 133 is a screw. The end of the screw passes through the guide seat 132 and abuts against the outer wall of the chuck member 131 to lock the chuck member 131 on the guide seat 132.

[0077] Furthermore, a limit shaft 136 is provided on the chuck member 131. The elastic member 134 is sleeved on the limit shaft 136, and the limit shaft 136 is slidably connected to the limit seat 135. The limit shaft 136 is a screw detachably installed at one end of the chuck member 131 facing away from the dial 31. The head of the screw cooperates with the limit seat 135 to prevent the chuck member 131 from detaching from the substrate 137 under the elastic action of the elastic member 134 after the positioning member 133 is disassembled. As Figure 7 shown, by adjusting the compression amount of the elastic member 134, the relative positional relationship between the chuck member 131 and the substrate 137 can be adjusted.

[0078] As Figure 3 、 Figure 10 shown, the driving member 22 is in a circular ring shape. A guide hole 221 for drivingly connecting with the chuck assembly 13 is provided on the driving member 22. When the driving member 22 rotates self, it drives the chuck assembly 13 to slide in the guide groove 12. Specifically, the driving member 22 is in a plate shape. The end of the driven shaft 138 is located in the guide hole 221, and the guide holes 221 are evenly distributed in a circular array centered on the center of the driving member 22.

[0079] Furthermore, as Figure 10 shown, the number of the guide holes 221 is multiple and corresponds to the chuck assembly 13 one by one. The structure of a single guide hole 221 is an arc-shaped long circular hole. The distance from one end of the guide hole 221 to the center of the driving member 22 is L1, and the distance from the other end of the guide hole 221 to the center of the driving member 22 is L2, and L1 is greater than L2.

[0080] Specifically, the degree of freedom of the chuck assembly 13 is restricted by the guiding groove 12 and can only move in the direction close to or away from the center of the dial 31; the end of the driven shaft 138 below the substrate 137 of the chuck assembly 13 is located in the guiding hole 221 of the driving member 22. When the driving member 22 rotates, the position of the end of the driven shaft 138 in the guiding hole 221 changes. Since the distances from the two ends of the guiding hole 221 to the center of the driving member 22 are different, when the driven shaft 138 is in different positions in the guiding hole 221, the distance between the chuck assembly 13 and the center of the dial 31 is different; the arc inclination directions of the multiple guiding holes 221 are the same and are evenly distributed in an annular array centered on the center of the driving member 22, so that when the driving member 22 rotates, the multiple chuck assemblies 13 rotate synchronously, and at the same time, the middle part of the driven shaft 138 moves in the avoidance hole 14.

[0081] By arranging a plurality of arc-shaped long circular holes with the same inclination direction on the rotating annular driving member 22 and arranging a driven shaft 138 on the chuck assembly 13, and adopting the shaft-hole matching method, the rotation of the driving member 22 is converted into the sliding of the chuck assembly 13 in the guiding groove 12. The structure is simple, and the manufacturing cost and occupied space of the driving mechanism 2 are reduced.

[0082] In addition, when the full-backplane turbine static balance measurement and positioning tooling of this embodiment is installed, try to ensure that the center of the driving member 22 coincides with the center of the dial 31, and the guiding grooves 12 are evenly distributed in an annular array centered on the dial 31, but there will inevitably be assembly errors.

[0083] In the full-backplane turbine static balance measurement and positioning tooling of this embodiment, during the calibration process of the positioning tooling: when adjusting the relative positions of the multiple chuck members 131 according to the coordinate data fed back by the measuring device, the relative position relationship between the chuck member 131 and the substrate 137 can be adjusted by adjusting the compression amount of the elastic member 134, and then the center of the circumference where the ends of the multiple chuck members 131 facing the dial 31 are located can be finely adjusted to correspond to the coordinate center point fed back by the device, so as to ensure that the geometric center of the calibrated rotor 4 coincides with the coordinate center point fed back by the device and complete the calibration process.

[0084] Embodiment Three:

[0085] On the basis of the above embodiments, this embodiment makes the use of the full-backplane turbine static balance measurement and positioning tooling more convenient. Further, as Figure 3 shown, a circular groove 231 matching the driving member 22 is provided on the upper surface of the driving seat 23, and the driving member 22 is rotatably installed in the circular groove 231. Specifically, the circular groove 231 matches the outer shape of the circular driving member 22.

[0086] It further includes a handle 21. An avoidance groove 232 is provided on one side of the annular sunk groove 231. The head end of the handle 21 is fixedly connected to the driving member 22. The tail end of the handle 21 is located outside the driving seat 23, and the middle part of the handle 21 is located in the avoidance groove 232, which is convenient for manually rotating the driving member 22.

[0087] Specifically, on the upper surface of the installation table 11, at the position corresponding to the avoidance groove 232, a marking arrow indicating the moving direction of the handle 21 is marked, and the directions of "in" and "out" are marked. When the handle 21 moves towards "in", the driving member 22 rotates, driving the chuck assembly 13 to move towards the dial 31.

[0088] The number of the guiding grooves 12 is three.

[0089] The full-backplane turbine static balance measurement and positioning tooling of this embodiment realizes three-point high-precision repeated positioning of the full-backplane turbine 5 to be measured. After the positioning is completed, the three points are separated from the full-backplane turbine 5 to avoid unnecessary interference with the full-backplane turbine 5, thereby ensuring that the repeated precision error of the measured unbalance amount is within an extremely low range.

[0090] The above description is an explanation of the present invention, not a limitation of the invention. The scope defined by the present invention can be seen in the claims. Any form of modification can be made within the protection scope of the present invention.

Claims

1. A full back plate turbine static balance measurement and positioning tool, characterized in that: include A drive seat (23), wherein the drive seat (23) is fixedly mounted on a base (3) of a static balance measuring device, and a measuring disk (31) of the static balance measuring device is located in the middle of the drive seat (23); A driving member (22), wherein the driving member (22) is rotatably mounted on the driving seat (23); A mounting platform (11), wherein the mounting platform (11) is fixedly mounted on the driving seat (23), and the driving member (22) is located between the mounting platform (11) and the driving seat (23); A plurality of guide grooves (12), the plurality of guide grooves (12) being located on the upper surface of the mounting platform (11), and the plurality of guide grooves (12) being evenly distributed in a circular array with the measuring plate (31) as the center; A plurality of chuck assemblies (13), the chuck assemblies (13) corresponding to the guide grooves (12) one by one, the chuck assemblies (13) being slidably connected to the guide grooves (12), and each chuck assembly (13) being provided with a chuck member (131) facing the measuring disk (31); The driving member (22) is in driving connection with a plurality of chuck assemblies (13) and is used to drive the chuck members (131) of the plurality of chuck assemblies (13) to move toward the measuring disk (31) simultaneously, so as to perform circumferential multi-point positioning of the calibration rotor (4) or the full backplate turbine (5) on the measuring disk (31).

2. The full back plate turbine static balance measurement and positioning tool as claimed in claim 1, characterized in that: The calibration rotor (4) is a rotating body whose center of gravity and geometric center are both located on the central axis.

3. The full back plate turbine static balance measurement and positioning tool as claimed in claim 1, characterized in that: The structure of the chuck assembly (13) is as follows: it includes a base plate (137), the base plate (137) is slidably matched with the guide groove (12), the chuck member (131) is installed on the base plate (137), and a driven shaft (138) is installed below the base plate (137), and the driven shaft (138) passes through the bottom of the guide groove (12) and is drivingly connected to the driving member (22).

4. The full back plate turbine static balance measurement and positioning tool as claimed in claim 3, characterized in that: The base plate (137) is also provided with a guide seat (132), a limit seat (135) and an elastic member (134); the chuck member (131) is slidably mounted on the guide seat (132); one end of the chuck member (131) faces the measuring disk (31); the other end of the chuck member (131) is connected to the limit seat (135) via the elastic member (134); the elastic member (134) is in a compressed state; and a positioning member (133) for fixing the relative position of the chuck member (131) and the guide seat (132) is provided on the guide seat (132).

5. The full back plate turbine static balance measurement and positioning tool as claimed in claim 4, characterized in that: The elastic member (134) is a spring.

6. The full back plate turbine static balance measurement and positioning tool as claimed in claim 1, characterized in that: The driving member (22) is in the shape of a circular ring and is provided with a guide hole (221) which is transmission-connected to the chuck assembly (13). When the driving member (22) rotates, it drives the chuck assembly (13) to slide in the guide groove (12).

7. The full back plate turbine static balance measurement and positioning tool as claimed in claim 6, characterized in that: The number of the guide holes (221) is multiple and corresponds one to one with the chuck assembly (13); the structure of a single guide hole (221) is an arc-shaped oblong hole; the distance between one end of the guide hole (221) and the center of the driving member (22) is L1, and the distance between the other end of the guide hole (221) and the center of the driving member (22) is L2, and L1 is greater than L2.

8. The full back plate turbine static balance measurement and positioning tool as claimed in claim 1, characterized in that: The upper surface of the driving seat (23) is provided with an annular recessed groove (231) that matches the driving member (22), and the driving member (22) is rotatably mounted in the annular recessed groove (231).

9. The full back plate turbine static balance measurement and positioning tool as claimed in claim 8, characterized in that: It also comprises a handle (21), a side of the annular recess (231) is provided with an avoidance groove (232), the head end of the handle (21) is fixedly connected to the driving member (22), the tail end of the handle (21) is located outside the driving seat (23), and the middle part of the handle (21) is located in the avoidance groove (232).

10. The full back plate turbine static balance measurement and positioning tool as claimed in claim 1, characterized in that: The number of the guide grooves (12) is three.

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