A device and method for measuring the diameter of a shaft of a ceiling-free guide vane

Abstract

A kind of not to hang top cover guide vane shaft diameter measuring device and method, including bottom ring, top support device and support piece, the support piece is connected between bottom ring and top support device, the bottom of top support device is equipped with driving device, the output shaft of driving device is hollow shaft, inner wall of hollow shaft is equipped with internal thread, the central axis of output shaft coincides with the central axis of bottom ring, linear module is installed on the support piece, bracket for installing displacement sensor is arranged on the slider of linear module.Accurately measure the shaft neck size of guide vane shaft without disassembling unit top cover, provide accurate data for the machining of guide vane shaft sleeve.

Description

Technical Field

[0001] This invention relates to the field of hydro-generator maintenance technology, and in particular to a device and method for measuring the shaft diameter of guide vanes without a suspended top cover. Background Technology

[0002] As a key component for flow regulation in hydro-generator units, the movable guide vane is described in the following section. Figure 5 The guide vane shaft 30 is the component that drives the movable guide vane to rotate, and the guide vane bushing 20 is the component that reduces the frictional resistance and the shaking of the guide vane shaft 30 during the operation of the movable guide vane. After long-term operation, both the guide vane shaft 20 and the guide vane bushing 20 will have varying degrees of wear. When the guide vane bushing is being repaired for defects or the unit is undergoing a Class B overhaul, without disassembling the unit top cover 20, the space near the guide vane journal 302 is restricted due to the small gap between the guide vane shaft 30 and the guide vane bushing mounting hole 101 on the top cover 20. This makes it difficult to use conventional length measuring tools to measure the dimensions and deviations at the journal 302.

[0003] The guide vane bushing 20 should ideally be machined according to the actual roundness dimensions of the upper journal 301 and the middle journal 302 of the guide vane shaft 30 after wear and deformation. However, due to the above reasons, this data cannot be accurately measured. It can only be machined by referring to the design values ​​in the drawings and empirical data, and by appropriately increasing the bushing clearance. The bushing of the guide vane (the mating point with the middle journal 302) machined in this way often has a large deviation from the actual dimensions that should be machined. Although it can still operate normally and ensure that the moving guide vanes of the unit do not jam or seize, increasing the bushing clearance will make it difficult to handle the clearance of the guide vane vertical surface, and will cause poor stress on the bushing and the guide vane itself, affecting the safe and stable operation of the hydro-generator unit. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the problems existing in the background art and provide a guide vane shaft diameter measuring device that does not require the top cover to be removed, so as to accurately measure the journal size of the guide vane shaft without disassembling the unit top cover, and provide accurate data for the machining of the guide vane bushing.

[0005] Another technical problem to be solved by the present invention is to provide a method for measuring the guide vane shaft diameter using a non-suspended top cover guide vane shaft diameter measuring device.

[0006] To achieve the above-mentioned technical features, the present invention aims to provide a non-suspended guide vane shaft diameter measuring device, comprising a bottom ring, a top support device, and a support member. The support member is connected between the bottom ring and the top support device. A drive device is installed at the bottom of the top support device. The output shaft of the drive device is a hollow shaft with an internal thread on its inner wall. The central axis of the output shaft coincides with the central axis of the bottom ring. A linear module is installed on the support member, and a bracket for mounting a displacement sensor is provided on the slider of the linear module.

[0007] The bottom ring includes an inner ring and an outer ring, with the outer ring rotatably mounted on the outside of the inner ring, and the support member mounted on either the inner ring or the outer ring.

[0008] The support consists of a ring array of multiple support rods and a support plate, and the linear module is mounted on the support plate.

[0009] The top support device consists of multiple trusses, with one end of each truss connected and fixed, and the other end extending radially. Support members are installed at the radial ends of the trusses.

[0010] The bottom of the top support device is equipped with a drive unit, and the drive unit is bolted to the underside of the drive unit.

[0011] The driving device is a speed reducer, and a drive motor is installed on the input shaft end of the speed reducer.

[0012] A support ring is installed at the lower end of the output shaft of the drive device, and multiple support columns are installed on the lower side of the support ring.

[0013] The linear module includes a slide table, a slider is slidably mounted on the slide table, a ball screw is also mounted on the slide table, the ball screw is screwed to the screw nut at the bottom of the slider, a servo motor is mounted at one end of the slide table, and the output shaft of the servo motor is connected to the ball screw for transmission.

[0014] The bracket includes a fixed rod and an extension rod. One end of the fixed rod is fixed to the slider, and the other end is fitted with a fixed seat. One end of the extension rod is connected to the fixed seat, and the other end is fitted with a mounting seat. A displacement sensor for measuring the guide vane shaft diameter is mounted on the mounting seat.

[0015] The method for measuring the guide vane shaft diameter using the aforementioned non-suspended top cover guide vane shaft diameter includes the following steps: S1. Remove the guide vane sleeve located on the top cover of the hydro turbine generator set to expose the guide vane shaft; S2. Install the displacement sensor onto the mounting base of the bracket; S3. Hoist the guide vane shaft diameter measuring device above the guide vane shaft, and then lower it through the guide vane sleeve mounting hole into the guide vane shaft. During the descent, adjust the position of the displacement sensor through the upper journal of the guide vane shaft. S4. The output shaft of the drive unit is connected and fixed to the guide vane shaft using connecting bolts, and the bottom ring is fitted on the lower side of the central journal of the guide vane shaft; wherein, when the connecting bolt is a through threaded rod, one end of the connecting bolt is first screwed into the central threaded hole at the upper end of the guide vane shaft, and then the output shaft is screwed into the other end of the connecting bolt; when the connecting bolt is a double-ended threaded rod, when the drive unit is close to the guide vane shaft, the double-ended threaded rod is simultaneously screwed into the central threaded hole at the upper end of the guide vane shaft and the output shaft of the drive unit. S5. The displacement sensor moves to the preset position of the central journal through the linear module. The drive device is started. The housing of the drive device drives the top support device, support component and bottom ring to rotate, so that the displacement sensor rotates around the central journal once and measures the wear data of the central journal. Then the drive device reverses one revolution and returns to the initial position. The displacement sensor measures the different elevation positions of the central journal through the axial movement of the linear module. S6. After the measurement of the middle journal is completed, the displacement sensor moves axially to the upper journal through the linear module, and measures the upper journal at different elevation positions using the same steps as in S5. S7. After the measurement is completed, remove the connecting bolts, separate the output shaft of the drive unit from the guide vane shaft, and lift the unit out.

[0016] The present invention has the following beneficial effects: 1. A ring-shaped frame is formed by a bottom ring, a top support device, and supporting components. A drive unit is installed on the lower side of the top support device. The drive unit is used to connect to the end of the guide vane shaft. After the output shaft of the drive unit is connected and fixed to the guide vane shaft, the housing of the drive unit drives the frame to rotate, thereby causing the displacement sensor on the bracket to measure the diameter of the guide vane shaft. The bracket is mounted on the slider of the linear module, so the displacement sensor can move axially through the linear module to measure the diameter of the journal at different elevations. With the above structure, the journal size of the guide vane shaft can be accurately measured without disassembling the top cover of the unit, providing accurate data for the machining of the guide vane bushing.

[0017] 2. The bottom ring consists of an inner ring and an outer ring. The outer ring is rotatably mounted on the outside of the inner ring. The support is mounted on either the inner or outer ring to achieve different installation and positioning methods. When the inner ring is positioned in conjunction with the lower end of the central journal, the support is mounted on the outer ring; when the outer ring is positioned on the lower side of the guide vane sleeve mounting hole, the support is mounted on the inner ring.

[0018] 3. A support ring is installed at the lower end of the output shaft of the drive unit, and multiple support columns are installed on the lower side of the support ring. When the device is installed on the guide vane shaft, the support columns support the drive unit on the upper end face of the guide vane shaft, providing operating space, ensuring the stability of the support structure when installing the connecting bolts, and preventing the drive unit from squeezing hands during hoisting, thus avoiding safety accidents.

[0019] 4. Using connecting bolts as shafts, with both ends installed in the center screw hole at the upper end of the guide vane shaft and in the output shaft of the drive device, respectively, fully ensures high concentricity between the guide vane shaft and the measuring device, and facilitates easy installation and connection. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0021] Figure 2 This is a three-dimensional structural schematic diagram of the present invention from another perspective.

[0022] Figure 3 This is a schematic diagram of a quarter section of the present invention.

[0023] Figure 4 for Figure 1 Enlarged structural diagram at point A in the middle.

[0024] Figure 5 This is a schematic diagram of the existing guide vane shaft and guide vane sleeve.

[0025] Figure 6 This is a schematic diagram showing the state after the guide vane sleeve has been removed.

[0026] Figure 7 This is a schematic diagram showing the state of the present invention installed on the guide vane shaft.

[0027] In the diagram: bottom ring 1, inner ring 11, outer ring 12, top support device 2, truss 21, support member 3, support rod 31, support plate 32, driver seat 4, drive device 5, output shaft 51, drive motor 52, support ring 53, support column 54, linear module 6, slide table 61, slider 62, ball screw 63, servo motor 64, bracket 7, fixing rod 71, fixing seat 72, extension rod 73, mounting seat 74; Top cover 10, guide vane sleeve mounting hole 101, guide vane sleeve 20, guide vane shaft 30, upper journal 301, middle journal 302, connecting bolt 40. Detailed Implementation

[0028] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0029] Example 1: See Figure 1-7A non-suspended guide vane shaft diameter measuring device includes a bottom ring 1, a top support device 2, and a support member 3. The support member 3 is connected between the bottom ring 1 and the top support device 2. A drive device 5 is installed at the bottom of the top support device 2. The output shaft 51 of the drive device 5 is a hollow shaft with internal threads on its inner wall. The central axis of the output shaft 51 coincides with the central axis of the bottom ring 1. A linear module 6 is installed on the support member 3. A bracket 7 for mounting a displacement sensor is provided on the slider 62 of the linear module 6. The bottom ring 1, the top support device 2, and the support member 3 form an annular frame. The drive device 5 is installed on the lower side of the top support device 2. The drive device 5 is used to connect to the end of the guide vane shaft. When the output shaft 51 of the drive device 5 is connected and fixed to the guide vane shaft, the housing of the drive device 5 drives the frame to rotate, thereby driving the displacement sensor on the bracket 7 to measure the shaft diameter of the guide vane shaft. The bracket 7 is mounted on the slider 62 of the linear module 6, so the displacement sensor can move axially through the linear module 6 to measure the diameter of the journal at different elevations. With the above structure, the journal size of the guide vane shaft can be accurately measured without disassembling the unit top cover 10, providing accurate data for the machining of the guide vane bushing 20.

[0030] See Figure 3 The bottom ring 1 includes an inner ring 11 and an outer ring 12. The outer ring 12 is rotatably mounted on the outside of the inner ring 11. The support member 3 is mounted on either the inner ring 11 or the outer ring 12. The outer ring 12 and the inner ring 11 can rotate by installing a bearing, or the inner ring 11 and the outer ring 12 can be designed as a bearing structure. When the inner ring 11 is positioned with the lower end of the central journal 302, the support member 3 is mounted on the outer ring 12; when the outer ring 12 is positioned on the lower side of the guide vane sleeve mounting hole 101, the support member 3 is mounted on the inner ring 11.

[0031] Specifically, the support member 3 consists of a ring array of multiple support rods 31 and a support plate 32, and the linear module 6 is mounted on the support plate 32. The hollow structure results in a lightweight overall design and facilitates the connection and installation of the output shaft 51 of the drive device 5 with the guide vane shaft 30.

[0032] Specifically, the top support device 2 consists of multiple trusses 21, with one end of each truss 21 connected and fixed, and the other end extending radially. Support members 3 are installed at the radial ends of the trusses 21. The structure is simple, stable, and lightweight. In addition to the above structure, the top support device 2 can also adopt a circular plate structure.

[0033] To facilitate the installation and connection of the drive unit 5 and the top support device 2, a drive unit 4 is installed at the bottom of the top support device 2, and the drive unit 5 is installed on the lower side of the drive unit 4 by bolts.

[0034] Furthermore, the drive unit 5 is a speed reducer, and a drive motor 52 is mounted on the input shaft end of the speed reducer. Specifically, the housing of the drive unit 5 is fixedly connected to the driver base 4, and the drive motor 52 drives the output shaft 51 of the drive unit 5 to rotate. Preferably, the drive motor 52 is a servo motor, and the speed reducer is a worm gear reducer.

[0035] See Figure 2 A support ring 53 is installed at the lower end of the output shaft 51 of the drive device 5, and multiple support columns 54 are installed on the lower side of the support ring 53. When the device is installed on the guide vane shaft 30, the drive device 5 is supported on the upper end face of the guide vane shaft 30 by the support columns 54, providing operating space, ensuring the stability of the support structure when installing the connecting bolts 40, and preventing the drive device from squeezing hands during hoisting, thus avoiding safety accidents.

[0036] Specifically, the linear module 6 includes a slide table 61, a slider 62 slidably mounted on the slide table 61, a ball screw 63 mounted on the slide table 61, the ball screw 63 being screwed to a screw nut at the bottom of the slider 62, and a servo motor 64 mounted at one end of the slide table 61, with the output shaft of the servo motor 64 connected to the ball screw 63 for transmission. The axial movement of the support 7 is achieved through the linear module 6.

[0037] For details, see Figure 4 The bracket 7 includes a fixed rod 71 and an extension rod 73. One end of the fixed rod 71 is fixedly mounted to the slider 62, and the other end is mounted to a fixed seat 72. One end of the extension rod 73 is connected to the fixed seat 72, and the other end is mounted to a mounting seat 74. A displacement sensor for measuring the guide vane shaft diameter is mounted on the mounting seat 74. The extension rod 73 faces the central axis of the bottom ring 1. The above structure enables the installation and adjustment of the displacement sensor. The fixed seat 72 and the mounting seat 74 are commonly used structures in the prior art and will not be described in detail here.

[0038] Example 2: See Figure 1-7 The method for measuring the guide vane shaft diameter using the aforementioned non-suspended top cover guide vane shaft diameter includes the following steps: S1. See also Figure 5 , 6 Remove the guide vane sleeve 20 located at the top cover 10 of the hydro turbine generator set, exposing the guide vane shaft 30.

[0039] S2. Install the displacement sensor onto the mounting base 74 of the bracket 7. Specifically, the displacement sensor is an eddy current displacement sensor.

[0040] S3. See also Figure 7The guide vane shaft diameter measuring device is hoisted above the guide vane shaft 30, and then lowered through the guide vane sleeve mounting hole 101 and fitted into the guide vane shaft 30. During the descent, the position of the displacement sensor is adjusted through the upper journal 301 of the guide vane shaft 30.

[0041] S4. The output shaft 51 of the drive device 5 is connected and fixed to the guide vane shaft 30 using connecting bolts 40, and the bottom ring 1 is fitted on the lower side of the central journal 302 of the guide vane shaft 30. The lower side of the central journal 302 does not contact the guide vane sleeve 20 and there is no wear. The shaft diameter here is still the original size and can be used as the reference for the lower end of the device.

[0042] When the connecting bolt 40 is a threaded rod, one end of the connecting bolt 40 is first screwed into the central threaded hole at the upper end of the guide vane shaft 30, and then the output shaft 51 is screwed into the other end of the connecting bolt 40. Rotating the output shaft 51 will turn on the drive motor 52. When the connecting bolt 40 is a double-ended threaded rod, when the drive device 5 is close to the guide vane shaft 30, the double-ended threaded rod is simultaneously screwed into the central threaded hole at the upper end of the guide vane shaft 30 and the output shaft 51 of the drive device 5. In this way, it is not necessary to turn on the drive motor 52; only the connecting bolt 40 needs to be tightened. This method achieves the connection and fixation between the guide vane shaft 30 and the drive device 5. During operation, the output shaft 51 of the drive device 5 is fixed, and the housing of the drive device 5 rotates, thereby driving the support device 2, the support member 3, and the bottom ring 1 to rotate.

[0043] S5. The displacement sensor moves to the preset position of the central journal 302 via the linear module 6. The drive device 5 is started. The housing of the drive device 5 drives the top support device 2, support member 3 and bottom ring 1 to rotate, so that the displacement sensor rotates around the central journal 302 for one revolution and measures the wear data of the central journal 302. Then the drive device 5 reverses one revolution and returns to the initial position. The displacement sensor measures the different elevation positions of the central journal 302 through the axial movement of the linear module 6.

[0044] S6. After the measurement of the middle journal 302 is completed, the displacement sensor moves axially to the upper journal 301 through the linear module 6, and measures the different elevation positions of the upper journal 301 using the same steps as in S5.

[0045] S7. After the measurement is completed, remove the connecting bolt 40, separate the output shaft 51 of the drive device 5 from the guide vane shaft 30, and lift the device out.

[0046] Both the drive unit 5 and the servo motors of the linear module 6 can be operated by a microcomputer control system. The control system can display the movement distance of the linear module 6 in real time, facilitating the control and determination of the sensor's movement to the designated position. This device measures the wear condition at the journal of the guide vane shaft, and the diameter dimension is obtained through data processing and analysis by the control system, thereby providing accurate data for the machining of the guide vane bushing and reducing safety hazards.

[0047] In addition to measuring the dimensions of the guide vane shaft of a hydro-generator set, this patent can also be applied to other applications such as high-precision measurement of roundness dimensions in confined spaces.

Claims

1. A method for measuring the shaft diameter of a guide vane without a suspended ceiling, characterized in that, A measuring device is adopted, which includes a bottom ring (1), a top support device (2) and a support member (3). The support member (3) is connected between the bottom ring (1) and the top support device (2). A driving device (5) is installed at the bottom of the top support device (2). The output shaft (51) of the driving device (5) is a hollow shaft with an internal thread on the inner wall. The central axis of the output shaft (51) coincides with the central axis of the bottom ring (1). A linear module (6) is installed on the support member (3). A bracket (7) for installing a displacement sensor is provided on the slider (62) of the linear module (6). The measurement method includes the following steps: S1. Remove the guide vane sleeve (20) of the guide vane shaft (30) located on the top cover (10) of the hydro turbine generator set to expose the guide vane shaft (30). S2. Install the displacement sensor onto the mounting base (74) of the bracket (7); S3. The guide vane shaft diameter measuring device is hoisted above the guide vane shaft (30), and then lowered through the guide vane sleeve mounting hole (101) and fitted into the guide vane shaft (30). During the descent, the position of the displacement sensor is adjusted through the upper journal (301) of the guide vane shaft (30). S4. The output shaft (51) of the drive device (5) is connected and fixed to the guide vane shaft (30) using connecting bolts (40), and the bottom ring (1) is fitted on the lower side of the central journal (302) of the guide vane shaft (30); wherein, when the connecting bolt (40) is a through screw, one end of the connecting bolt (40) is first screwed into the central screw hole at the upper end of the guide vane shaft (30), and then the output shaft (51) is screwed into the other end of the connecting bolt (40); when the connecting bolt (40) is a double-ended positive and negative threaded screw, when the drive device (5) and the guide vane shaft (30) are close, the double-ended positive and negative threaded screw is simultaneously screwed into the central screw hole at the upper end of the guide vane shaft (30) and the output shaft (51) of the drive device (5); S5. The displacement sensor moves to the preset position of the central journal (302) through the linear module (6), the drive device (5) is started, and the housing of the drive device (5) drives the top support device (2), support member (3) and bottom ring (1) to rotate, so that the displacement sensor rotates around the central journal (302) once and measures the wear data of the central journal (302). Then the drive device (5) reverses one turn and returns to the initial position. The displacement sensor measures the different elevation positions of the central journal (302) through the axial movement position of the linear module (6). S6. After the measurement of the middle journal (302) is completed, the displacement sensor moves axially to the upper journal (301) through the linear module (6) and measures the different elevation positions of the upper journal (301) using the same steps as in S5. S7. After the measurement is completed, remove the connecting bolt (40), separate the output shaft (51) of the drive device (5) from the guide vane shaft (30), and lift the device out.

2. The method for measuring the shaft diameter of a guide vane without a suspended ceiling as described in claim 1, characterized in that: The bottom ring (1) includes an inner ring (11) and an outer ring (12), with the outer ring (12) rotatably mounted on the outside of the inner ring (11), and the support member (3) mounted on the inner ring (11) or the outer ring (12).

3. The method for measuring the shaft diameter of a guide vane without a suspended ceiling as described in claim 1, characterized in that: The support member (3) consists of a ring array of multiple support rods (31) and a support plate (32), and the linear module (6) is mounted on the support plate (32).

4. The method for measuring the shaft diameter of a guide vane without a suspended ceiling as described in claim 1, characterized in that: The top support device (2) consists of multiple trusses (21), with one end of each truss (21) connected and fixed, and the other end extending radially. Support members (3) are installed at the radial ends of the trusses (21).

5. A method for measuring the shaft diameter of a guide vane without a suspended ceiling, as described in claim 1 or 4, characterized in that: The bottom of the top support device (2) is equipped with a driver seat (4), and the drive device (5) is installed on the underside of the driver seat (4) by bolts.

6. The method for measuring the shaft diameter of a guide vane without a suspended ceiling as described in claim 1, characterized in that: The drive device (5) is a speed reducer, and a drive motor (52) is installed on the input shaft end of the speed reducer.

7. A method for measuring the shaft diameter of a guide vane without a suspended ceiling, as described in claim 1 or 6, characterized in that: A support ring (53) is installed at the lower end of the output shaft (51) of the drive device (5), and multiple support columns (54) are installed on the lower side of the support ring (53).

8. The method for measuring the shaft diameter of a guide vane without a suspended ceiling as described in claim 1, characterized in that: The linear module (6) includes a slide (61), a slider (62) is slidably mounted on the slide (61), a ball screw (63) is also mounted on the slide (61), the ball screw (63) is screwed to the screw nut at the bottom of the slider (62), a servo motor (64) is mounted on one end of the slide (61), and the output shaft of the servo motor (64) is connected to the ball screw (63) for transmission.

9. The method for measuring the shaft diameter of a guide vane without a suspended ceiling as described in claim 1, characterized in that: The bracket (7) includes a fixed rod (71) and an extension rod (73). One end of the fixed rod (71) is fixed to the slider (62), and the other end is fitted with a fixed seat (72). One end of the extension rod (73) is connected to the fixed seat (72), and the other end is fitted with a mounting seat (74). A displacement sensor for measuring the guide vane shaft diameter is mounted on the mounting seat (74).

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