A precise positioning device and positioning method for positioning ribs of a hydraulic generator stator

Abstract

The present invention belongs to the technical field of installation of hydropower station unit equipment, and provides a precise positioning device and positioning method for the stator positioning ribs of a hydro-turbine generator. The positioning device includes a stator measuring frame equipped with a sliding bearing, a rotatable measuring arm is installed on the sliding bearing, a first displacement sensor is installed on the measuring arm through a radial measuring bracket, and a positioning assembly and a second displacement sensor are hinged on the radial measuring bracket. The positioning method includes eight steps: checking and installing the reference positioning ribs, installing the displacement sensor, collecting radial and circumferential clearance data from the displacement sensor to the reference positioning ribs, obtaining the number of steps required for the stepper motor to rotate, temporarily fixing the positioning ribs, spot welding the positioning ribs, and repeating temporary fixing and spot welding to position the next positioning rib. The present invention can improve the positioning accuracy of the positioning ribs, simplify the installation and adjustment procedures of the positioning ribs, improve the installation efficiency, and at the same time save the investment in tools such as the lap welding template of the positioning ribs in large equal parts, saving construction costs.

Description

Technical Field

[0001] The invention belongs to the technical field of installation of unit equipment of a hydropower station, and relates to a positioning rib positioning device and a positioning method, and in particular to a precise positioning rib positioning device and a positioning method for a stator of a hydro-turbine generator. Background Art

[0002] The stator of a large hydro-turbine generator set is affected by its size and weight. It arrives in loose parts and is assembled into a whole in the installation room or pit through a series of complex processes such as stator frame welding, positioning rib installation welding, lower gear pressure plate installation, and stator core stacking. Among them, the installation of positioning ribs is one of the key processes in stator assembly. The quality of the positioning ribs directly affects the smooth stacking of the stator core, and even seriously affects the long-term stable operation of the unit. The following two methods are usually used for positioning ribs:

[0003] (1) The stator core stacking adopts the guide key positioning method. The guide key adjustment adopts the positioning principle of "key-sheet-key". First, install the reference key, pre-stack the stator punching sheet with a height of about 10mm to 20mm, and after preliminary shaping and rounding, determine the position of the large equal-division guide key. After placing the large equal-division guide keys in place, adjust the radius, verticality, and chord distance of the large equal-division guide keys to meet the requirements, that is, the large equal-division guide keys are accurately positioned. Based on the accurate positioning of the large equal-division guide keys, the pre-stacked sheets are accurately rounded and shaped. After completion, check and confirm that the corresponding conditions of the screw holes, the center deviation between the punching sheet and the pressing finger, the roundness and radius meet the requirements, and then temporarily fix them. The installation position of each guide key in the large equal division is determined by the finely adjusted punching sheet. Although the principle of this method is relatively simple, due to the low height of the pre-stacked sheets, its positioning effect is not good. It is easy to need to adjust the radius and chord distance of some guide keys during stacking, which directly affects the stacking efficiency and quality.

[0004] (2) The stator core stacking adopts the positioning method of positioning ribs. Special tools provided by the manufacturer, such as C-clamps, single-head jacks, chord spacing templates, lap welding templates, etc., are used to install and adjust each positioning rib in the order of reference ribs, large equal-division positioning ribs, positioning ribs within large equal-divisions, and overall inspection. In actual construction, since many power stations are currently striving to create "quality projects", the quality standards for unit installation have been further improved. The standards for positioning rib installation are far superior to national standards and manufacturer technical requirements, and the positioning rib adjustment process is relatively complex and time-consuming. In addition, the position of the positioning ribs in large equal-divisions and large equal-divisions cannot be accurately located, and repeated adjustments of the positioning ribs are prone to occur, resulting in an extension of the installation period and affecting the timely realization of the stator assembly node goals.

[0005] Regardless of the above methods, the positioning and adjustment process of the positioning ribs is relatively complicated and time-consuming. The installation period of the positioning ribs accounts for about 50% of the entire stator construction period. With the increasing requirements for high standards and high efficiency in the installation of hydropower station equipment, it is urgent to solve the problem of complex and time-consuming positioning and adjustment of the positioning ribs in order to shorten the stator assembly period. Summary of the invention

[0006] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a precise positioning device and positioning method for the stator positioning ribs of a hydro-turbine generator, so as to solve the technical problems in the prior art that the positioning and adjustment operation of the positioning ribs is complicated and time-consuming.

[0007] To achieve the above-mentioned purpose and other related purposes, the present invention provides a precise positioning device for stator locating ribs of a hydro-turbine generator, comprising a stator circular measuring frame, a sliding bearing is installed on the central column of the circular measuring frame of the stator circular measuring frame, measuring arms and balancing arms are relatively installed on both sides of the sliding bearing, the measuring arms and balancing arms are driven to rotate by a rotation angle control component, the suspended end of the measuring arm is connected to a radial measuring bracket through a telescopic member, a first displacement sensor for measuring the radius of the locating rib is installed on the opposite surface of the radial measuring bracket and the locating rib, a plurality of groups of positioning components are hinged on the opposite surface of the radial measuring bracket and the measuring arm, a plurality of circumferential measuring brackets are also hinged on the opposite surface of the radial measuring bracket and the measuring arm, and a second displacement sensor for measuring the chord distance of the locating rib is connected to the end of the suspended end of the circumferential measuring bracket.

[0008] Preferably, in any of the above schemes, the rotation angle control assembly includes a stepper motor, a planetary reducer and a transmission mechanism, and the stepper motor and the planetary reducer are combined into one body and fixedly mounted on the balance arm near the sliding bearing side.

[0009] Preferably in any of the above schemes, the transmission mechanism includes a driving gear and a driven gear plate that mesh with each other, the driving gear is installed at the output end of the stepper motor and planetary reducer combination, and the driven gear plate is installed on the central column of the measuring frame and is located below the sliding bearing.

[0010] Preferably, in any of the above schemes, a plurality of the first displacement sensors are respectively installed at positions of the positioning ribs corresponding to each layer of the ring plate, and the first displacement sensor is installed at a central position of the radial measuring bracket corresponding to each layer of the ring plate.

[0011] Preferably in any of the above schemes, each group of the positioning components includes two first hinge seat base plates, the two first hinge seat base plates are fixedly connected to the opposite surfaces of the radial measuring bracket and the measuring arm, the two first hinge seat base plates are installed between the two layers of ring plates and are symmetrically arranged about the center line of the positioning rib, and each of the first hinge seat base plates is hinged with a first "7"-shaped rotating plate, and the suspended end of the first "7"-shaped rotating plate is connected to a dove tail surface limit plate matching the dove tail shape of the positioning rib.

[0012] Preferably in any of the above schemes, the circumferential measurement bracket includes a second "7"-shaped rotating plate and a second hinge seat base plate, the second hinge seat base plate is fixed on the opposite surface of the radial measurement bracket and the measuring arm, the horizontal end of the second "7"-shaped rotating plate is hinged to the second hinge seat base plate and is located above the layers of ring plates corresponding to the positioning ribs, and the second displacement sensor is connected to the suspended end of the second "7"-shaped rotating plate.

[0013] Preferably in any of the above schemes, the radial measurement bracket is a hollow box-type structure, a waist-shaped hole is provided on the side of the radial measurement bracket opposite to the positioning rib, a square hole is provided on the side of the radial measurement bracket opposite to the measuring arm, and the first displacement sensor is inserted into the waist-shaped hole through the square hole and then fixed to the radial measurement bracket through a nut.

[0014] Preferably in any of the above schemes, waist-shaped holes are symmetrically opened on the upper and lower sides of the bottom plate of the first hinge seat.

[0015] Preferably in any of the above solutions, the first displacement sensor and the second displacement sensor are connected to a data conversion device and a computer.

[0016] A positioning method for a precise positioning device of a stator positioning rib of a hydro-generator comprises the following steps:

[0017] Step 1: Check the positioning ribs and adjust the verticality of the stator measuring frame;

[0018] Step 2: Install, adjust and fix the reference locating rib, measure the absolute radius of the reference point at the bottom of the reference locating rib, and convert the absolute radius value of the reference locating rib at each ring position;

[0019] Step 3: Determine the installation positions of the first displacement sensor and the second displacement sensor and install the first displacement sensor and the second displacement sensor;

[0020] Step 4: Collect radial and circumferential clearance data from the first displacement sensor and the second displacement sensor to the reference positioning rib;

[0021] Step 5: According to the number of locating ribs, the number of steps required for the stepper motor to rotate is obtained;

[0022] Step 6: temporarily fix the positioning rib on the positioning ring plate, that is, according to the number of steps calculated in step 5, input the corresponding pulse to the stepper motor to control the stator measuring frame to rotate to the required installation position of the next positioning rib, place the positioning rib to be installed, adjust the inner surface of the positioning rib to be flush with the dove tail surface limit plate, and the dove tail surface of the positioning rib is in close contact with the dove tail surface of the dove tail surface limit plate, and then temporarily fix the positioning rib on the positioning ring plate;

[0023] Step 7: Determine the installation position of the locating rib and fix it by spot welding, that is, collect radial clearance data from the first displacement sensor to the locating rib and circumferential clearance data from the second displacement sensor to the locating rib respectively, and adjust the position of the locating rib according to the collected radial clearance data and circumferential clearance data, so that the radial clearance between the locating rib and the first displacement sensor and the circumferential clearance between the locating rib and the second displacement sensor are both less than 0.02mm from the clearance value of the reference locating rib collected in step 4. At this time, the position of the locating rib is the installation position, and the locating rib is spot welded and fixed at this position;

[0024] Step 8: Position and adjust the next positioning rib according to steps 6 and 7, and repeat the process in sequence. After one cycle, all positioning ribs can be positioned and installed.

[0025] As described above, the device and method for accurately positioning the stator positioning ribs of a hydro-generator according to the present invention have the following beneficial effects:

[0026] 1. In the present invention, a rotation angle control component is installed on the stator circular measuring frame, which can accurately control the rotation angle of the stator circular measuring frame, and is assisted by a positioning component to perform preliminary positioning of the positioning ribs, and combined with a displacement sensor that can accurately measure the radial and circumferential distances of the positioning ribs, the precise positioning, measurement and adjustment of the installation position of the positioning ribs are achieved.

[0027] 2. In the present invention, the positioning assembly and the circumferential measuring bracket are both hinged structures and have a limiting function, so that the positioning assembly and the circumferential measuring bracket can rotate around their own pin shafts to be closed and opened, thereby avoiding the influence of the stator circular measuring frame on the circumferential rotation due to the positioning assembly or the circumferential measuring bracket being too long; at the same time, when in the limiting position, the dove tail surface limiting plate of the positioning assembly contacts the dove tail surface of the positioning rib, and the protruding end of the circumferential measuring bracket is parallel to the dove tail surface of the positioning rib, thereby further improving the measurement accuracy and the accuracy of the initial positioning, and reducing the workload of precise adjustment.

[0028] 3. The present invention can greatly improve the positioning accuracy of the positioning ribs, simplify the installation and adjustment procedures of the positioning ribs, and improve the installation efficiency of the positioning ribs. At the same time, it can save the investment in tools such as the lap welding templates of the positioning ribs in large equal parts, thereby saving the construction cost investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1Shown is a schematic diagram of the positioning monitoring arrangement of the present invention.

[0030] Figure 2 It is a schematic plan view of the present invention.

[0031] Figure 3 Shown is a plan view of the transmission mechanism.

[0032] Figure 4 Shown is a plan schematic diagram of the positioning assembly and the circumferential measurement bracket in working condition.

[0033] Figure 5 It shows a plan view of the positioning assembly and the circumferential measurement bracket in the rotating state of the stator circular measuring frame.

[0034] Figure 6 Display as Figure 4 P-direction view.

[0035] Component number description

[0036] 1- stator circular measuring frame, 1.1- central column of the circular measuring frame, 1.2- sliding bearing, 1.3- measuring arm, 1.4- balancing arm, 2- rotation angle control assembly, 2.1- stepping motor, 2.2- planetary reducer, 2.3- transmission mechanism, 2.31- driving gear, 2.32- driven gear plate, 3- radial measuring bracket, 4- first displacement sensor, 5- positioning rib, 6- circumferential measuring bracket, 6.1- second "7" type rotating plate, 6.2- second hinge seat bottom plate, 7- positioning assembly, 7.1- first "7" type rotating plate, 7.2- first hinge seat bottom plate, 7.3- dove tail surface limit plate, 8- second displacement sensor, 9- waist hole, 10- square hole. DETAILED DESCRIPTION

[0037] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0038] See also Figures 1 to 6. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0039] See also Figure 1-6 The present invention provides a precise positioning device for stator positioning ribs of a hydro-turbine generator, comprising a stator circular measuring frame 1, a sliding bearing 1.2 is installed on the central column 1.1 of the stator circular measuring frame 1, a measuring arm 1.3 and a balancing arm 1.4 are installed on both sides of the sliding bearing 1.2, and the measuring arm 1.3 and the balancing arm 1.4 are driven to rotate by a rotation angle control component 2, the suspended end of the measuring arm 1.3 is connected to a radial measuring bracket 3 through a telescopic member, a plurality of first displacement sensors 4 for measuring the radius of the positioning rib 5 are installed on the opposite surface of the radial measuring bracket 3 and the positioning rib 5, a plurality of groups of positioning components 7 are hinged on the opposite surface of the radial measuring bracket 3 and the measuring arm 1.3, a circumferential measuring bracket 6 is also hinged on the opposite surface of the radial measuring bracket 3 and the measuring arm 1.3, and a second displacement sensor 8 for measuring the chord distance of the positioning rib 5 is connected to the suspended end of the circumferential measuring bracket 6.

[0040] When this embodiment is used, the stator circle measuring frame 1 includes a bottom plate, which is fixed at the center position inside the generator stator, and the center column 1.1 of the circle measuring frame is fixedly connected to the middle of the bottom plate. A sliding bearing 1.2 is installed on the center column 1.1 of the circle measuring frame, and a measuring arm 1.3 and a balancing arm 1.4 are installed on both sides of the sliding bearing 1.2. The balancing arm 1.4 plays a balancing role on the measuring arm 1.3, thereby ensuring the stability of the entire device during use. A first displacement sensor 4 and a second displacement sensor 8 are installed on the measuring arm 1.3 through a radial measuring bracket 3, wherein the first displacement sensor 4 is used to measure the radial distance from the first displacement sensor 4 to the positioning rib 5, that is, the radius of the positioning rib 5, and the second displacement sensor 8 is used to measure the circumferential distance from the second displacement sensor 8 to the positioning rib 5, that is, the chord distance of the positioning rib 5.

[0041] At the same time, a positioning assembly 7 and a circumferential measurement bracket 6 are also provided on the radial measurement bracket 3, and a second displacement sensor 8 is installed at the suspended end of the circumferential measurement bracket 6. The positioning assembly 7 and the circumferential measurement bracket 6 are both circumferentially adjustable hinged structures, and can only rotate 270° along their own rotation axis. During the adjustment of the positioning rib 5, the positioning assembly 7 and the circumferential measurement bracket 6 are in a closed state, that is, in a limited position; during the rotation of the stator circular measuring frame 1, the positioning assembly 7 and the circumferential measurement bracket 6 are in an open state, that is, rotated 90° from the limited position, to ensure that there is no contact between the positioning assembly 7 and the circumferential measurement bracket 6 and the stator (including the positioning rib 5) during the rotation, thereby avoiding the influence of the stator circular measuring frame 1 on the circumferential rotation due to the excessive length of the positioning assembly 7 or the circumferential measurement bracket 6, and ensuring the normal operation of the device.

[0042] In this embodiment, the measuring arm 1.3 itself may be a radially extendable structure, or a telescopic member may be connected to the suspended end of the measuring arm 1.3 to ensure that the measuring arm 1.3 is radially extendable, thereby ensuring that the dove-tail limit plate 7.3 at the end of the positioning assembly 7 can be made flush with the inner surface of the positioning rib 5 by adjusting the radial extension of the measuring arm 1.3, thereby achieving the fixation of the positioning rib 5.

[0043] In this embodiment, a plurality of first displacement sensors 4 are respectively installed at the positions of the positioning ribs 5 corresponding to each layer of the ring plates, and the first displacement sensors 4 are installed at the center position corresponding to the radial measuring bracket 3 and each layer of the ring plates, so as to measure the radial distance from the first displacement sensor 4 to the positioning ribs 5, that is, the radius of the positioning ribs 5.

[0044] In this embodiment, the structure of the measuring arm 1.3 and the balancing arm 1.4, the connection method between the measuring arm 1.3 and the balancing arm 1.4 and the central column 1.1 of the circle measuring frame, and the connection method between the sliding bearing 1.2 and the central column 1.1 of the circle measuring frame all belong to the prior art, and those skilled in the art can know it based on the prior art, so this embodiment will not be further described.

[0045] As a further description of the above embodiment, the rotation angle control assembly 2 includes a stepper motor 2.1, a planetary reducer 2.2 and a transmission mechanism 2.3, wherein the stepper motor 2.1 and the planetary reducer 2.2 are combined into one body and fixedly mounted on the side of the balance arm 1.4 close to the sliding bearing 1.2. The transmission mechanism 2.3 includes a driving gear 2.31 and a driven gear plate 2.32 meshing with each other, wherein the driving gear 2.31 is mounted at the output end of the combination of the stepper motor 2.1 and the planetary reducer 2.2, and the driven gear plate 2.32 is mounted on the central column 1.1 of the circle measuring frame and is located below the sliding bearing 1.2.

[0046] When this embodiment is used, the step angle of the stepper motor 2.1 is selected to be 0.72°. The speed ratio of the planetary reducer 2.2 is 1:1000. The transmission ratio of the driving gear 2.31 and the driven gear plate 2.32 is 1:20, that is, the stepper motor 2.1 needs to rotate 500*1000*20=10000000 step angles for each rotation of the stator circular measuring frame 1.

[0047] During operation, a pulse signal is input to the stepper motor 2.1. When the stepper motor 2.1 and the planetary reducer 2.2 are in operation, the driving gear 2.31 drives the stepper motor 2.1 and the planetary reducer 2.2 to rotate around the driven gear plate 2.32, thereby driving the measuring arm 1.3 and the balancing arm 1.4 on the stator circle measuring frame 1 to rotate to the required angle to measure the radius and chord distance of the positioning rib 5.

[0048] Calculated based on the stator inner diameter of the giant hydro-turbine generator set being 16m, the circumference of the distribution of the positioning ribs 5 is about 50m, i.e. 50000mm. Therefore, every 200 step angles are equivalent to a 1mm rotation in the circumference direction of the end of the stator measuring frame 1. Therefore, after the stepper motor 2.1 receives a pulse, the circumferential rotation of the stator measuring frame 1 at the 16m diameter position is 1 / 200mm, which is approximately equal to the chord length rotation, i.e. 0.005mm. According to the non-accumulated angular error of 2.15% of the stepper motor, this error can be almost ignored. Combined with the installation requirement that the positioning deviation of the positioning rib 5 is not greater than 0.10mm, plus the measurement deviation of about 0.02mm, the positioning of the positioning rib 5 by this device is completely superior to the installation data of the positioning rib 5 by the conventional method.

[0049] As a further description of the above embodiment, each group of the positioning components 7 includes two first hinge seat base plates 7.2, and the two first hinge seat base plates 7.2 are fixedly connected to the opposite surfaces of the radial measuring bracket 3 and the measuring arm 1.3. The two first hinge seat base plates 7.2 are installed between the two layers of ring plates and are symmetrically arranged about the center line of the positioning rib 5. Each of the first hinge seat base plates 7.2 is hinged with a first "7"-shaped rotating plate 7.1, and the suspended end of the first "7"-shaped rotating plate 7.1 is connected to a dove tail surface limit plate 7.3 that matches the dove tail shape of the positioning rib 5.

[0050] When this embodiment is used, a group of positioning components 7 is correspondingly arranged at the installation position of each positioning rib 5. The positioning components 7 are installed at the corresponding position in the middle of the two layers of ring plates and are symmetrically arranged one each in the upper and lower parts along the center line of the positioning rib 5. The first hinge seat bottom plate 7.2 is fixedly connected to the opposite surface of the radial measurement bracket 3 and the measuring arm 1.3. The first "7"-shaped rotating plate 7.1 is hinged on the first hinge seat bottom plate 7.2 and is located at the corresponding position in the middle of the two layers of ring plates, that is, the positioning component is located at the corresponding position in the middle of the two layers of ring plates. The suspended end of the first "7"-shaped rotating plate 7.1 in the positioning component 7 is a dove tail surface limiting plate 7.3, which matches the dove tail shape of the positioning rib 5. At the same time, waist-shaped holes 9 are opened on the upper and lower parts of the first hinge seat bottom plate 7.2, which are used to adjust the dove tail surface limiting plate 7.3 at the end of the positioning component 7 to be in close contact with the dove tail surface on one side of the reference positioning rib 5. In the closed state, the dove-tail surface limiting plate 7.3 at the suspended end of the first "7"-shaped rotating plate 7.1 contacts the dove-tail surface of the positioning rib 5, playing a positioning role for the positioning rib 5.

[0051] As a further description of the above embodiment, the circumferential measurement bracket 6 includes a second "7"-shaped rotating plate 6.1 and a second hinge seat bottom plate 6.2, and the second hinge seat bottom plate 6.2 is fixed on the opposite surface of the radial measurement bracket 3 and the measuring arm 1.3. The horizontal end of the second "7"-shaped rotating plate 6.1 is hinged on the second hinge seat bottom plate 6.2 and is located above the corresponding layers of ring plates of the positioning ribs 5, and the second displacement sensor 8 is connected to the suspended end of the second "7"-shaped rotating plate 6.1.

[0052] When this embodiment is used, the second hinge seat bottom plate 6.2 is fixed to the opposite surface of the radial measurement bracket 3 and the measurement arm 1.3, and the second "7"-shaped rotating plate 6.1 is hinged to the radial measurement bracket 3 through the second hinge seat bottom plate 6.2. In the closed state, the vertical end of the second "7"-shaped rotating plate 6.1 is parallel to the dove-tail surface of the positioning rib 5, and the second displacement sensor 8 installed at the suspended end of the second "7"-shaped rotating plate 6.1 measures the circumferential distance from the second displacement sensor 8 to the positioning rib 5, that is, the chord distance of the positioning rib 5.

[0053] In this embodiment, a square hole 10 is provided at the vertically suspended end of the second "7"-shaped rotating plate 6.1, and the second displacement sensor 8 passes through the square hole 10 on the second "7"-shaped rotating plate 6.1 and is fixed by a nut.

[0054] As a further description of the above embodiment, the radial measurement bracket 3 is a hollow box-type structure, and a waist-shaped hole 9 is provided on the side of the radial measurement bracket 3 opposite to the positioning rib 5, and a square hole 10 is provided on the side of the radial measurement bracket 3 opposite to the measuring arm 1.3. The first displacement sensor 4 is inserted into the waist-shaped hole 9 through the square hole 10 and then fixed to the radial measurement bracket 3 through a nut.

[0055] When this embodiment is used, a square hole 10 is provided on one side of the radial measurement bracket 3 opposite to the measuring arm 1.3 for mounting the first displacement sensor 4, and a waist-shaped hole 9 is provided on one side of the radial measurement bracket 3 opposite to the positioning rib 5. The first displacement sensor 4 is inserted into the waist-shaped hole 9 provided at the radial measurement position of the positioning rib 5 on the radial measurement bracket 3 through the square hole 10, and the first displacement sensor 4 is fixed to the radial measurement bracket 3 by nuts at the front and back.

[0056] In this embodiment, the waist-shaped hole 9 is provided to facilitate adjustment of the circumferential position of the first displacement sensor 4 , ensuring that the center line of the first displacement sensor 4 corresponds to the center line of the positioning rib 5 .

[0057] As a further description of the above embodiment, the first displacement sensor 4 and the second displacement sensor 8 are connected to a data conversion device and a computer.

[0058] When this embodiment is used, the first displacement sensor 4 and the second displacement sensor 8 can calculate the circumferential and radial clearance values ​​between the end faces of each ring plate and the reference positioning rib 5, that is, the chord distance and radius of the positioning rib 5, through the data conversion device and the computer measurement, thereby facilitating the positioning, installation and adjustment of the positioning rib 5.

[0059] In summary, the method for positioning the positioning rib 5 using the precise positioning device for the stator positioning rib of a hydro-turbine generator comprises the following steps:

[0060] 1. Check the positioning rib 5 before installation and adjust the stator measuring frame 1 to a verticality of 0.02 mm and a verticality of no more than 0.05 mm within the measuring range.

[0061] 2. Install the reference positioning rib 5, adjust the precision positioning rib 5 and fix the reference positioning rib 5 after it is qualified. Then, measure the absolute radius R0 of the reference point at the bottom of the reference positioning rib 5, and then hang the piano wire in the radial direction of the reference positioning rib 5, and use the "electrical measurement method" to measure the distance L2 from the rib surface of each ring position of the reference positioning rib 5 to the piano wire, and compare it with the distance of the reference point to convert the absolute radius value of the reference positioning rib 5 at each ring position.

[0062] In this step, the absolute radius of the reference positioning rib 5 is the measured radius of the positioning rib 5, which is convenient for comparison with the design radius of the positioning rib 5. If the error between the measured absolute radius of the reference positioning rib 5 and the design radius of the positioning rib 5 is no more than 0.05 mm, the installation position of the reference positioning rib 5 is qualified.

[0063] During the installation of the positioning rib 5, the data collected by the first displacement sensor 4 is only the distance from the positioning rib 5 to the first displacement sensor 4, which cannot represent the radius of the positioning rib 5. When the installation of the positioning rib 5 is completed and accepted, the radius value of each positioning rib 5 must be issued. Therefore, if you want to calculate the radius of other positioning ribs 5, you must get a reference radius value, so that you can convert the distance from the first displacement sensor 4 to the positioning rib 5 into the radius value of other positioning ribs 5. Specifically:

[0064] The absolute radius of each ring position of the reference positioning rib 5 is R=R0+L1-L2, where:

[0065] R0 is the absolute radius of the lower reference point of the reference positioning rib 5.

[0066] L1 is the distance from the reference point to the piano wire,

[0067] L2 is the distance from each ring position of the reference positioning rib 5 to the piano wire.

[0068] The absolute radius of other positioning ribs Ri=R+L i0 -L i ,in,

[0069] L i0 is the distance from the reference positioning rib at a certain ring position to the first displacement sensor,

[0070] L i It is the distance from other positioning ribs at a certain ring position to the first displacement sensor.

[0071] 3. Determine the installation positions of the first displacement sensor 4 and the second displacement sensor 8 and install the first displacement sensor 4 and the second displacement sensor 8. The specific method is as follows:

[0072] 1) Input pulse signal to stepper motor 2.1. When stepper motor 2.1 and planetary reducer 2.2 are running, driving gear 2.31 drives stepper motor 2.1 and planetary reducer 2.2 to rotate around driven gear plate 2.32, thereby driving measuring arm 1.3 and balancing arm 1.4 of stator circular measuring frame 1 to rotate to the center of reference positioning rib 5, and aligning measuring arm 1.3 with the center of reference positioning rib 5. During the rotation of stator circular measuring frame 1, positioning assembly 7 and circumferential measuring bracket 6 are in "open" state.

[0073] 2) Close the positioning assembly 7, check the correspondence between the positioning assembly 7 and the reference positioning rib 5, adjust the telescopic length of the measuring arm 1.3 so that the dove-tail surface limit plate 7.3 at the end of the positioning assembly 7 is flush with the inner surface of the positioning rib 5; adjust the circumferential position of the first hinge seat bottom plate 7.2 in the positioning assembly 7 so that the dove-tail surface of the dove-tail surface limit plate 7.3 contacts the dove-tail surface on one side of the positioning rib 5. After completion, place the positioning assembly 7 in the "open" state, that is, the positioning assembly 7 is rotated 90° counterclockwise along its own rotation axis.

[0074] 3) Install each first displacement sensor 4 in the waist-shaped hole 9 of the radial measurement bracket 3 corresponding to the position of each layer of the ring plate, check and adjust the center line of each first displacement sensor 4 to be consistent with the center line of the reference positioning rib 5, and adjust the distance from the first displacement sensor 4 to the surface of the reference positioning rib 5 to 3mm. After completion, fix the first displacement sensor 4 on the radial measurement bracket 3 with a nut; rotate the circumferential measurement bracket 6 counterclockwise by 90°, check and adjust the distance from the second displacement sensor 8 to the dovetail surface of the reference positioning rib 5 to 3mm, and fix the second displacement sensor 8 on the radial measurement bracket 3.

[0075] 4. After collecting the radial and circumferential clearance data from the first displacement sensor 4 and the second displacement sensor 8 to the reference positioning rib 5 (i.e., the clearance values ​​of the reference positioning rib 5 are consistent), the circumferential measurement bracket 6 is placed in the "open" state, i.e., the circumferential measurement bracket 6 is rotated 90° clockwise along its own rotation axis.

[0076] 5. According to the number of locating ribs 5, the number of steps required for the stepper motor 2.1 to rotate is obtained.

[0077] Calculate according to the formula:

[0078] Where: α is the number of steps, n is the number of positioning ribs 5.

[0079] 6. Temporarily fix the positioning rib 5 on the positioning ring plate. The specific method is as follows:

[0080] According to the number of steps calculated in step 5, pulses are input to the stepper motor 2.1 to control the stator circular measuring frame 1 to rotate to the required installation position of the next positioning rib 5, the positioning rib 5 to be installed is placed, and the inner surface of the positioning rib 5 is adjusted to be flush with the dove tail surface limit plate 7.3, and the dove tail surface of the positioning rib 5 is in close contact with the dove tail surface of the dove tail surface limit plate 7.3 of the positioning assembly 7, and then the positioning rib 5 is temporarily fixed on the positioning ring plate.

[0081] In this process, when the stepper motor 2.1 drives the stator circular measuring frame 1 to rotate, the positioning assembly 7 is placed in the "closed" state, and the positioning assembly 7 is in the limit position, that is, the first "7"-shaped rotating plate 7.1 rotates 90° clockwise along the first hinge seat bottom plate 7.2.

[0082] After the temporary fixation of the positioning rib 5 on the positioning ring plate is completed, the positioning assembly 7 is placed in the "open" state, that is, the first "7"-shaped rotating plate 7.1 rotates 90 degrees counterclockwise along the first hinge seat bottom plate 7.2.

[0083] 7. Determine the installation position of the positioning rib 5 and fix it by spot welding. The specific method is as follows:

[0084] The circumferential measurement bracket 6 is placed in the "closed" state, and the radial clearance data from the first displacement sensor 4 to the positioning rib 5 and the circumferential clearance data from the second displacement sensor 8 to the positioning rib 5 are collected. According to the collected data, the radial clearance between the positioning rib 5 and the first displacement sensor 4 and the circumferential clearance between the positioning rib 5 and the second displacement sensor 8 are adjusted to be consistent with the clearance value of the reference positioning rib 5 (the deviation is not greater than 0.02mm). At this time, the position of the positioning rib 5 is the installation position, that is, the positioning rib 5 is accurately positioned. The positioning rib 5 is spot welded and fixed at this position. After the retest of each data is qualified, the circumferential measurement bracket 6 is placed in the "open" state.

[0085] 8. Position and adjust the next positioning rib 5 according to steps 6 and 7, and repeat the process in sequence. After one cycle, all the positioning ribs 5 can be arranged in place.

[0086] In summary, the present invention can greatly improve the positioning accuracy of the positioning ribs, simplify the installation and adjustment process of the positioning ribs, improve the installation efficiency of the positioning ribs, and save the investment in tools such as the lap welding template of the positioning ribs in the large equal parts, saving the construction cost investment. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0087] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A device for accurately positioning the stator positioning ribs of a hydro-generator, comprising a stator circular measuring frame (1), characterized in that: A sliding bearing (1.2) is installed on the central column (1.1) of the stator circular measuring frame (1), and measuring arms (1.3) and balancing arms (1.4) are installed on both sides of the sliding bearing (1.2) in a relative manner. The measuring arms (1.3) and balancing arms (1.4) are driven to rotate by a rotation angle control component (2). The suspended end of the measuring arm (1.3) is connected to a radial measuring bracket (3) through a telescopic member. A plurality of first displacement sensors (4) for measuring the radius of the locating rib (5) are installed on the opposite surface of the radial measuring bracket (3) and the locating rib (5). A plurality of groups of positioning components (7) are hingedly connected on the opposite surface of the radial measuring bracket (3) and the measuring arm (1.3), and each group of the positioning components (7) comprises two first hinge seat bottom plates (7. 2), two of the first hinge seat bottom plates (7.2) are fixedly connected to the opposite surfaces of the radial measurement bracket (3) and the measurement arm (1.3), the two first hinge seat bottom plates (7.2) are installed between the two layers of ring plates and are symmetrically arranged about the center line of the positioning rib (5), each of the first hinge seat bottom plates (7.2) is hinged with a first "7"-shaped rotating plate (7.1), the suspended end of the first "7"-shaped rotating plate (7.1) is connected to a dove tail surface limit plate (7.3) matching the dove tail shape of the positioning rib (5), and a plurality of circumferential measurement brackets (6) are hinged on the opposite surfaces of the radial measurement bracket (3) and the measurement arm (1.3), and the suspended end of the circumferential measurement bracket (6) is connected to a second displacement sensor (8) for measuring the chord distance of the positioning rib (5).

2. The precise positioning device for the stator positioning ribs of a hydro-generator according to claim 1 is characterized in that: The rotation angle control component (2) comprises a stepper motor (2.1), a planetary reducer (2.2) and a transmission mechanism (2.3); the stepper motor (2.1) and the planetary reducer (2.2) are combined into one body and are fixedly mounted on the side of the balance arm (1.4) close to the sliding bearing (1.2).

3. The precise positioning device for the positioning ribs of the stator of a hydro-generator according to claim 2 is characterized in that: The transmission mechanism (2.3) comprises a driving gear (2.31) and a driven gear disc (2.32) meshing with each other, the driving gear (2.31) being mounted on the output end of a combination of a stepping motor (2.1) and a planetary reducer (2.2), and the driven gear disc (2.32) being mounted on a central column (1.1) of a measuring frame and being located below a sliding bearing (1.2).

4. The precise positioning device for the positioning ribs of a hydraulic generator stator according to claim 1 is characterized in that: A plurality of the first displacement sensors (4) are respectively installed at positions of the positioning ribs (5) corresponding to each layer of the ring plate, and the first displacement sensors (4) are installed at the central position of the radial measurement bracket (3) corresponding to each layer of the ring plate.

5. The precise positioning device for the positioning ribs of the stator of a hydro-generator according to claim 1 is characterized in that: The circumferential measurement bracket (6) comprises a second "7"-shaped rotating plate (6.1) and a second hinge seat bottom plate (6.2); the second hinge seat bottom plate (6.2) is fixed to the opposite surface of the radial measurement bracket (3) and the measuring arm (1.3); the horizontal end of the second "7"-shaped rotating plate (6.1) is hinged to the second hinge seat bottom plate (6.2) and is located above the corresponding layers of the ring plates of the positioning ribs (5); and the second displacement sensor (8) is connected to the suspended end of the second "7"-shaped rotating plate (6.1).

6. The precise positioning device for the positioning ribs of the stator of a hydro-generator according to claim 1 is characterized by: The radial measurement bracket (3) is a hollow box-shaped structure. A waist-shaped hole (9) is provided on a side of the radial measurement bracket (3) opposite to the positioning rib (5). A square hole (10) is provided on a side of the radial measurement bracket (3) opposite to the measuring arm (1.3). The first displacement sensor (4) is inserted into the waist-shaped hole (9) through the square hole (10) and is then fixed to the radial measurement bracket (3) by a nut.

7. The precise positioning device for the positioning ribs of a hydraulic generator stator according to claim 1, characterized in that: The first hinge seat bottom plate (7.2) is symmetrically provided with waist-shaped holes (9) on the upper and lower sides.

8. The precise positioning device for the positioning ribs of a hydraulic generator stator according to claim 1, characterized in that: The first displacement sensor (4) and the second displacement sensor (8) are connected to a data conversion device and a computer.

9. The positioning method of the precise positioning device for the stator positioning ribs of a hydro-turbine generator according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Check the positioning ribs (5) and adjust the verticality of the stator circular measuring frame (1); Step 2: Install, adjust and fix the reference positioning rib (5); Step 3: Determine the installation positions of the first displacement sensor (4) and the second displacement sensor (8) and install the first displacement sensor (4) and the second displacement sensor (8); Step 4: Collecting radial and circumferential clearance data from the first displacement sensor (4) and the second displacement sensor (8) to the reference positioning rib (5); Step 5: According to the distribution number of the positioning ribs (5), the number of steps required for the stepping motor (2.1) to rotate is obtained; Step 6: temporarily fix the positioning rib (5) on the positioning ring plate, that is, according to the number of steps calculated in step 5, input corresponding pulses to the stepper motor (2.1) to control the stator circular measuring frame (1) to rotate to the required installation position of the next positioning rib (5), place the positioning rib (5) to be installed, adjust the inner surface of the positioning rib (5) to be flush with the dove tail surface limit plate (7.3), and the dove tail surface of the positioning rib (5) is in close contact with the dove tail surface of the dove tail surface limit plate (7.3), and then temporarily fix the positioning rib (5) on the positioning ring plate; Step 7: Determine the installation position of the positioning rib (5) and fix it by spot welding, that is, respectively collect radial clearance data from the first displacement sensor (4) to the positioning rib (5) and circumferential clearance data from the second displacement sensor (8) to the positioning rib (5), and adjust the position of the positioning rib (5) according to the collected radial clearance data and circumferential clearance data, so that the radial clearance between the positioning rib (5) and the first displacement sensor (4) and the circumferential clearance between the positioning rib (5) and the second displacement sensor (8) are both less than 0.02 mm from the clearance value of the reference positioning rib (5) collected in step 4. At this time, the position of the positioning rib (5) is the installation position, and the positioning rib (5) is fixed by spot welding at this position; Step 8: Position and adjust the next positioning rib (5) according to steps 6 and 7, and repeat the process in sequence. After one cycle, all positioning ribs (5) can be positioned and installed.

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