CN115342705B - Method for determining updating and reconstruction reference center of large axial flow rotating paddle type hydroelectric generating set - Google Patents
Method for determining updating and reconstruction reference center of large axial flow rotating paddle type hydroelectric generating set Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 claims description 42
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- 238000003475 lamination Methods 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 12
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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Abstract
The invention relates to a method for determining a standard center for updating and reforming a large-scale axial-flow paddle type hydroelectric generating set. The method utilizes the jigger before repairing the unit to determine the center of the unit, and by setting the fixed measuring point and the reference object and measuring data between the fixed measuring point and the reference object, the new center of the unit during assembly is determined, the determination process of the center of the unit is simplified, the method has strong operability, practical verification is obtained in 21 units of the same type, the determination of the center standard of the old fixed part is avoided, the construction period and manpower and material resources are greatly reduced, the determination precision and efficiency of the center of the unit are improved, and the method has high economical efficiency.
Description
Technical Field
The invention belongs to the technical field of updating and reforming of a hydroelectric generating set, and relates to a method for determining an updating and reforming reference center of a large-sized axial flow paddle hydroelectric generating set.
Background
The hydropower station of a certain axial-flow rotating-propeller type unit runs for nearly 40 years, the equipment unit is seriously aged, the hydraulic performance is reduced, and therefore, the unit equipment is required to be modified and updated. When the unit is firstly installed, the upper and lower boring openings of the seat ring are generally used as the center of the unit, but after the unit runs for a long time, the surface of the boring opening of the seat ring is severely corroded and cannot be used as a center reference in the unit transformation process.
When the unit is in operation, when the central line of the unit rotating part is coincident with the central line of the unit fixing part, the electromagnetic unbalance and the hydraulic unbalance of the unit are minimum, and the unit is most stable in operation. When the machine set is stopped and reformed, the rotating part and the accessory part are required to be lifted, and when the machine set is lifted again, the central line of the rotating part of the machine set and the central line of the fixed part of the machine set are required to be redetermined and coincide, so that a method for determining the updating and reforming reference center of the large-scale axial-flow rotating-propeller machine set is required to be provided.
The Chinese patent with publication number of CN113108678A proposes a method for measuring and adjusting the center of a fixed part of a hydroelectric generating set, wherein the method is used for measuring the average center, roundness and verticality of a stator core, and measuring the cross-sectional dimensions of different parts of the stator core, after the hydroelectric generating set operates for a long time, the fixed part and a rotating part of the hydroelectric generating set are subjected to wear and corrosion, and the method is difficult to implement the reinstallation process after the hydroelectric generating set is updated and reformed, and has larger error.
Disclosure of Invention
In order to solve the problems of the background technology, the invention provides a method for determining the update transformation reference center of a large axial flow rotating paddle type hydroelectric generating set, which comprises the steps of determining the center position of the set by turning before disassembling the hydroelectric generating set, setting fixed measuring points and reference objects at different parts of the set, making measuring marks, determining the size between each measuring point and the reference object according to the fixed measuring points and the measuring marks when the set is reassembled after maintenance, and restoring the set during reassembling to the state of the turning before disassembling, thereby enabling the center of the reassembled set to coincide with the center of the set after turning, simplifying the method for determining the center of the set before and after the modification process of the set, greatly improving the determination efficiency and the debugging efficiency of the center of the set after the update transformation of the set, and also guaranteeing the accuracy of the center of the set.
In order to achieve the above object, the present invention provides the following technical solutions: a method for determining a standard center for updating and reforming a large axial flow rotating paddle type hydroelectric generating set comprises the following steps of S1, determining the center position of the set by turning before repairing: turning adjustment is carried out before updating and reconstruction until the levelness deviation of the mirror plate is not more than 0.02mm/m, the air gap deviation is not more than +/-10% of the air gap, the gaps between the rotating wheel chambers and the air shroud are uniform, and the gap deviation between each rotating wheel chamber and the average gap is not more than +/-10% of the average gap;
s2, monitoring relative displacement and measuring tile rack level: before the main parts of the unit are disassembled, 4 round steels are welded on the +/-X and +/-Y directions on the supporting cover respectively, fixed measuring points are selected on the top cover, and the distances from the fixed measuring points to the corresponding round steels are measured respectively; after the thrust bracket is lifted out, measuring and recording levelness of the support cover and the water guide tile bracket X and Y;
s3, center return point of the unit: after finishing the turning before repairing, 4 measuring points are selected in the four directions of +/-X and +/-Y of the inner wall of the water guide shoe rack, permanent marks are used as measuring points, the distance from each measuring point to the water guide shaft collar is measured by using an inside micrometer, measuring data are recorded, and the water guide center is used as a new center value of the unit at the moment and is used as a basis for hoisting return points of the unit;
s4, indoor return point of the rotating wheel: sequentially disassembling and hanging the unit components until the supporting cover is hung, at the moment, the turbine shaft is not hung, measuring the radial horizontal distance from the inner circular surface of the annular plate on the top cover to the outer circle of the flange on the turbine shaft on site to determine the concentricity of the top cover relative to the rotation center of the unit, then disassembling and hanging the turbine shaft, re-hanging the supporting cover, and after the supporting cover is installed in place according to the original direction, checking the level of the supporting cover, wherein the deviation of two measurement data in the same direction is required to be not more than 0.05mm/m; measuring the distance from the round steel at the upper part of the support cover to the fixed measuring point of the top cover, wherein the repeated measurement error at the same position is not more than 0.02mm; welding two supporting pieces in the diameter direction of the inner wall of the rotating wheel chamber, wherein the supporting pieces protrude out of the lining of the foundation pit by 150mm, the height of the supporting pieces is 500mm higher than that of the top cover, a return point beam is arranged on the supporting pieces, a core finder is erected on the return point beam, and the water guide center is returned to the piano wire, so that the deviation between the center of the piano wire and the water guide center of the turning before repairing is less than or equal to 0.02mm; the X, Y marking line on the top cover is led to the same elevation on the inner wall of the pit liner by a plumb bob, and marked obviously; measuring distances from the marking points in the four directions of +/-X and +/-Y on the pit lining to the piano wire, and converting the center of the piano wire into distances from 4 measuring points to the piano wire; then removing the return point beam, lifting out the support cover, the rotating wheel, the top cover and the guide vane, and then lifting in the rotating wheel chamber dismounting platform in sequence;
s5, mounting a steel platform: the cross steel platform is hung into the machine pit, the center of the steel platform is initially adjusted by using a tape measure, the lamination platform is hung into the machine pit, the lamination platform is put on a wind brake foundation plate, the position of a central hole of the lamination platform is adjusted, the lap joint length of a support arm of the lamination platform and a support pier of a brake is uniform, and the installation of a stator circle measuring frame is not prevented; after the center of the steel platform is adjusted and spot-welded, 4 round steels are symmetrically welded at the foundation plate at the epitaxial end part of the steel platform support arm for monitoring whether the steel platform is displaced or not in the construction process.
Preferably, when the unit is assembled, the new center of the unit is controlled according to the unit center position determined by the jigger before repair.
Preferably, the control process comprises the following steps when re-hanging and installing the individual components:
s1, mounting a stator rounding frame: dismantling a piano wire device, symmetrically welding 4 circle measuring frame base cushion plates on a steel platform center body, placing a circle measuring frame base seat on a base plate, installing a circle measuring frame center post and a circle measuring frame support arm, adjusting a circle measuring frame counterweight to enable the circle measuring frame support arm to flexibly rotate, measuring and adjusting the distance between the center post and square steel according to the center data of the cross steel platform center body returned by the water guide center measured before repairing, and enabling the deviation between the center post center and the water guide center before repairing to be less than or equal to 0.05mm;
s2, respectively erecting piano wires in the X and Y directions of a circle measuring frame support arm, measuring and adjusting the verticality of a center column of the circle measuring frame, so that the verticality deviation is not more than 0.02mm/m;
s3, vertically installing a dial indicator at the end part of the outer circle of the circle measuring frame support arm, rotating the circle measuring frame support arm for a plurality of circles in the same direction, requiring the repeated measurement data deviation of the same measuring point to be not more than 0.05mm, and returning to the original position; otherwise, checking and adjusting the center and verticality of the center column of the circle measuring frame, and checking and adjusting the levelness of the support arm of the circle measuring frame until the requirement is met;
s3, measuring the center of a rotating wheel chamber: measuring the distance between the middle ring and the lower ring of the runner chamber and the piano wire, and adjusting the deviation between the centers of the middle ring and the lower ring of the runner chamber and the center of the piano wire to be not more than 0.05mm; fine-tuning the runner chamber and the foundation ring by taking a piano wire as a center reference, so that the coaxiality of the foundation ring and the runner chamber is less than 1mm, and the concentricity of the foundation ring and the runner chamber is less than 0.5mm; after the center adjustment of the foundation ring and the rotating wheel chamber is completed, the foundation ring and the rotating wheel chamber combined bolts are installed and symmetrically tightened according to the requirement, the coaxiality of the retest foundation ring and the rotating wheel chamber is smaller than 1mm, and the concentricity of the foundation ring and the rotating wheel chamber is smaller than 0.5mm.
Preferably, when the return point is hung into the supporting cover, the distances from the fixed measuring point to the corresponding round steel are measured again respectively, and the supporting cover is adjusted to ensure that the repeated measurement error at the same position is not more than 0.02mm.
The beneficial effects of the invention are as follows:
1. the method utilizes the jigger before repairing the unit to determine the center of the unit, and by setting the fixed measuring point and the reference object and measuring data between the fixed measuring point and the reference object, the new center of the unit during assembly is determined, the determination process of the center of the unit is simplified, the method has strong operability, and practical verification is obtained in 21 units of the same type.
2. The method avoids measuring the center standard of the old fixed part, greatly reduces construction period and manpower and material resources, improves the accuracy and efficiency of unit center determination, and has high economical efficiency.
Drawings
FIG. 1 is a schematic diagram of the determination state of the center of a unit in the present invention.
In the figure: 10. a support cover; 20. fixing the measuring point; 30. a wheel chamber; 40. a cross steel platform; 50. lining the pit; A. and repairing the center of the unit determined by the front jigger.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the embodiment of the invention provides a method for determining a updating and reconstruction reference center of a large axial flow rotating paddle type hydroelectric generating set, which comprises the following steps of S1, determining the central position of the set by turning before repairing: before updating and reforming, turning adjustment is carried out until the levelness deviation of the mirror plate is not more than 0.02mm/m, the air gap deviation is not more than +/-10% of the air gap, the gaps between the rotating wheel chambers 30 and the air shroud are uniform, the gap deviation between each rotating wheel chamber 30 and the average gap is not more than +/-10% of the average gap, and in the figure, A is the center of a unit determined by turning before repairing;
s2, monitoring relative displacement and measuring tile rack level: before the main parts of the unit are disassembled, 4 round steels are welded on the +/-X and +/-Y directions on the supporting cover 10 respectively, fixed measuring points 20 are selected on the top cover, and the distances from the fixed measuring points to the corresponding round steels are measured respectively; after the thrust bracket is lifted out, measuring and recording levelness of the support cover 10 and the water guide tile brackets X and Y;
s3, center return point of the unit: after finishing the turning before repairing, 4 measuring points are selected in the four directions of +/-X and +/-Y of the inner wall of the water guide shoe rack, permanent marks are used as measuring points, the distance from each measuring point to the water guide shaft collar is measured by using an inside micrometer, measuring data are recorded, and the water guide center is used as a new center value of the unit at the moment and is used as a basis for hoisting return points of the unit;
s4, indoor return point of the rotating wheel: sequentially disassembling and hanging the unit components until the supporting cover 10 is hung, at the moment, the turbine shaft is not hung, measuring the radial horizontal distance from the inner circular surface of the annular plate on the top cover to the outer circle of the flange on the turbine shaft on site to determine the concentricity of the top cover relative to the rotation center of the unit, then disassembling and hanging the turbine shaft, re-hanging the supporting cover 10, and checking the levelness of the supporting cover 10 after the supporting cover is installed in place according to the original direction, wherein the deviation of two measurement data in the same direction is required to be not more than 0.05mm/m; measuring the distance from the round steel at the upper part of the supporting cover 10 to the fixed measuring point of the top cover, wherein the repeated measurement error at the same position is not more than 0.02mm; welding two supporting pieces in the diameter direction of the inner wall of the rotating wheel chamber, wherein the supporting pieces protrude out of the lining of the foundation pit by 150mm, the height of the supporting pieces is 500mm higher than that of the top cover, a return point beam is arranged on the supporting pieces, a core finder is erected on the return point beam, and the water guide center is returned to the piano wire, so that the deviation between the center of the piano wire and the water guide center of the turning before repairing is less than or equal to 0.02mm; the X, Y marking line on the top cover is led to the same elevation on the inner wall of the pit liner by a plumb bob, and marked obviously; measuring distances from the four direction marking points + -X and + -Y led to the pit lining 50 to the piano wire, and converting the center of the piano wire into distances from 4 measuring points to the piano wire; then removing the return point beam, lifting out the support cover, the rotating wheel, the top cover and the guide vane, and then lifting in the rotating wheel chamber dismounting platform in sequence;
s5, mounting a steel platform: the cross steel platform 40 is hung into the machine pit, the center of the steel platform is initially adjusted by a tape measure, the lamination platform is hung into the machine pit, the lamination platform is put on a wind brake foundation plate, the position of a central hole of the lamination platform is adjusted, the lap joint length of a lamination platform support arm and a brake buttress is uniform, and the installation of a stator circle measuring frame is not prevented; after the center of the steel platform is adjusted and spot-welded, 4 round steels are symmetrically welded at the foundation plate at the epitaxial end part of the steel platform support arm for monitoring whether the steel platform is displaced or not in the construction process.
The embodiment avoids measuring the center standard of the old fixed part, greatly reduces construction period and manpower and material resources, improves the accuracy and efficiency of unit center determination, and has high economical efficiency.
In another embodiment, when the unit is assembled, a new center of the unit is controlled according to the center position of the unit determined by turning before repair, and the control process comprises the following steps:
s1, mounting a stator rounding frame: dismantling a piano wire device, symmetrically welding 4 circle measuring frame base cushion plates on a steel platform center body, placing a circle measuring frame base seat on a base plate, installing a circle measuring frame center post and a circle measuring frame support arm, adjusting a circle measuring frame counterweight to enable the circle measuring frame support arm to flexibly rotate, measuring and adjusting the distance between the center post and square steel according to the center data of the cross steel platform center body returned by the water guide center measured before repairing, and enabling the deviation between the center post center and the water guide center before repairing to be less than or equal to 0.05mm;
s2, respectively erecting piano wires in the X and Y directions of a circle measuring frame support arm, measuring and adjusting the verticality of a center column of the circle measuring frame, so that the verticality deviation is not more than 0.02mm/m;
s3, vertically installing a dial indicator at the end part of the outer circle of the circle measuring frame support arm, rotating the circle measuring frame support arm for a plurality of circles in the same direction, requiring the repeated measurement data deviation of the same measuring point to be not more than 0.05mm, and returning to the original position; otherwise, checking and adjusting the center and verticality of the center column of the circle measuring frame, and checking and adjusting the levelness of the support arm of the circle measuring frame until the requirement is met;
s3, measuring the center of a rotating wheel chamber: measuring the distance between the middle ring and the lower ring of the runner chamber and the piano wire, and adjusting the deviation between the centers of the middle ring and the lower ring of the runner chamber and the center of the piano wire to be not more than 0.05mm; fine-tuning the runner chamber and the foundation ring by taking a piano wire as a center reference, so that the coaxiality of the foundation ring and the runner chamber is less than 1mm, and the concentricity of the foundation ring and the runner chamber is less than 0.5mm; after the center adjustment of the foundation ring and the rotating wheel chamber is completed, the foundation ring and the rotating wheel chamber combined bolts are installed and symmetrically tightened according to the requirement, the coaxiality of the retest foundation ring and the rotating wheel chamber is smaller than 1mm, and the concentricity of the foundation ring and the rotating wheel chamber is smaller than 0.5mm.
In a preferred embodiment, when the back-up point is lifted into the supporting cover 10, the distances from the fixed measuring points to the corresponding round bars are measured again, and the installation state of the supporting cover 10 is adjusted so that the repeated measurement error of the position is not more than 0.02mm.
The embodiment utilizes the jigger before repairing the unit to determine the center of the unit, and by setting the fixed measuring point and the reference object and measuring data between the fixed measuring point and the reference object, the new center of the unit during assembling is determined, the determining process of the center of the unit is simplified, the operability is very strong, and the practical verification is obtained in 21 units of the same type.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (4)
1. A method for determining a reference center for updating and reforming a large axial-flow rotating paddle type hydroelectric generating set is characterized by comprising the following steps:
s1, determining the central position of a unit by repairing a front jigger: turning adjustment is carried out before updating and reconstruction until the levelness deviation of the mirror plate is not more than 0.02mm/m, the air gap deviation is not more than +/-10% of the air gap, the gaps between the rotating wheel chambers and the air shroud are uniform, and the gap deviation between each rotating wheel chamber and the average gap is not more than +/-10% of the average gap;
s2, monitoring relative displacement and measuring tile rack level: before the main parts of the unit are disassembled, 4 round steels are welded on the +/-X and +/-Y directions on the supporting cover respectively, fixed measuring points are selected on the top cover, and the distances from the fixed measuring points to the corresponding round steels are measured respectively; after the thrust bracket is lifted out, measuring and recording levelness of the support cover and the water guide tile bracket X and Y;
s3, center return point of the unit: after finishing the turning before repairing, 4 measuring points are selected in the four directions of +/-X and +/-Y of the inner wall of the water guide shoe rack, permanent marks are used as measuring points, the distance from each measuring point to the water guide shaft collar is measured by using an inside micrometer, measuring data are recorded, and the water guide center is used as a new center value of the unit at the moment and is used as a basis for hoisting return points of the unit;
s4, indoor return point of the rotating wheel: sequentially disassembling and hanging the unit components until the supporting cover is hung, at the moment, the turbine shaft is not hung, measuring the radial horizontal distance from the inner circular surface of the annular plate on the top cover to the outer circle of the flange on the turbine shaft on site to determine the concentricity of the top cover relative to the rotation center of the unit, then disassembling and hanging the turbine shaft, re-hanging the supporting cover, and after the supporting cover is installed in place according to the original direction, checking the level of the supporting cover, wherein the deviation of two measurement data in the same direction is required to be not more than 0.05mm/m; measuring the distance from the round steel at the upper part of the support cover to the fixed measuring point of the top cover, wherein the repeated measurement error at the same position is not more than 0.02mm; welding two supporting pieces in the diameter direction of the inner wall of the rotating wheel chamber, wherein the supporting pieces protrude out of the lining of the foundation pit by 150mm, the height of the supporting pieces is 500mm higher than that of the top cover, a return point beam is arranged on the supporting pieces, a core finder is erected on the return point beam, and the water guide center is returned to the piano wire, so that the deviation between the center of the piano wire and the water guide center of the turning before repairing is less than or equal to 0.02mm; the X, Y marking line on the top cover is led to the same elevation on the inner wall of the pit liner by a plumb bob, and marked obviously; measuring distances from the marking points in the four directions of +/-X and +/-Y on the pit lining to the piano wire, and converting the center of the piano wire into distances from 4 measuring points to the piano wire; then removing the return point beam, lifting out the support cover, the rotating wheel, the top cover and the guide vane, and then lifting in the rotating wheel chamber dismounting platform in sequence;
s5, mounting a steel platform: the cross steel platform is hung into the machine pit, the center of the steel platform is initially adjusted by using a tape measure, the lamination platform is hung into the machine pit, the lamination platform is put on a wind brake foundation plate, the position of a central hole of the lamination platform is adjusted, the lap joint length of a support arm of the lamination platform and a support pier of a brake is uniform, and the installation of a stator circle measuring frame is not prevented; after the center of the steel platform is adjusted and spot-welded, 4 round steels are symmetrically welded at the foundation plate at the epitaxial end part of the steel platform support arm for monitoring whether the steel platform is displaced or not in the construction process.
2. The method for determining the updated transformation reference center of the large axial-flow rotating-propeller type hydroelectric generating set according to claim 1, wherein the new center of the set is controlled according to the set center position determined by turning before repair during assembly of the set.
3. The method for determining the updated transformation reference center of the large axial flow rotary paddle type hydroelectric generating set according to claim 2, wherein the control process comprises the following steps when each component is re-hung in and installed:
s1, mounting a stator rounding frame: dismantling a piano wire device, symmetrically welding 4 circle measuring frame base cushion plates on a steel platform center body, placing a circle measuring frame base seat on a base plate, installing a circle measuring frame center post and a circle measuring frame support arm, adjusting a circle measuring frame counterweight to enable the circle measuring frame support arm to flexibly rotate, measuring and adjusting the distance between the center post and square steel according to the center data of the cross steel platform center body returned by the water guide center measured before repairing, and enabling the deviation between the center post center and the water guide center before repairing to be less than or equal to 0.05mm;
s2, respectively erecting piano wires in the X and Y directions of a circle measuring frame support arm, measuring and adjusting the verticality of a center column of the circle measuring frame, so that the verticality deviation is not more than 0.02mm/m;
s3, vertically installing a dial indicator at the end part of the outer circle of the circle measuring frame support arm, rotating the circle measuring frame support arm for a plurality of circles in the same direction, requiring the repeated measurement data deviation of the same measuring point to be not more than 0.05mm, and returning to the original position; otherwise, checking and adjusting the center and verticality of the center column of the circle measuring frame, and checking and adjusting the levelness of the support arm of the circle measuring frame until the requirement is met;
s3, measuring the center of a rotating wheel chamber: measuring the distance between the middle ring and the lower ring of the runner chamber and the piano wire, and adjusting the deviation between the centers of the middle ring and the lower ring of the runner chamber and the center of the piano wire to be not more than 0.05mm; fine-tuning the runner chamber and the foundation ring by taking a piano wire as a center reference, so that the coaxiality of the foundation ring and the runner chamber is less than 1mm, and the concentricity of the foundation ring and the runner chamber is less than 0.5mm; after the center adjustment of the foundation ring and the rotating wheel chamber is completed, the foundation ring and the rotating wheel chamber combined bolts are installed and symmetrically tightened according to the requirement, the coaxiality of the retest foundation ring and the rotating wheel chamber is smaller than 1mm, and the concentricity of the foundation ring and the rotating wheel chamber is smaller than 0.5mm.
4. The method for determining the updated transformation reference center of the large axial-flow rotary-paddle type hydroelectric generating set according to claim 1, wherein when the return point is lifted into the supporting cover, the distances from the fixed measuring point to the corresponding round steel are measured again respectively, and the supporting cover is adjusted to enable the repeated measurement error of the same position to be not more than 0.02mm.
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