CN214502417U - Center measuring, positioning and adjusting device of hydraulic generator - Google Patents

Abstract

The utility model relates to a power station hydraulic turbine maintenance field, hydraulic generator central measurement location adjusting device promptly. The instrument is used for measuring, positioning and adjusting the center and the elevation of the unit. The adjustable flange plate comprises a fixed support, wherein a basic flange plate is arranged on the fixed support, four screw caps are fixed on the surface of the basic flange plate at intervals of 90 degrees, each screw cap is screwed with a bolt jackscrew, and an adjustable flange plate is connected in the middle of the four bolt jackscrews in a jacking mode. The device has the advantages of simple structure, easy processing, convenient assembly and disassembly, simple measuring method and high measuring precision, can realize the manufacturing, processing, installation and measurement on a construction site without a large number of precise instruments and professional measurement teams, is convenient for operation and implementation of construction units, saves the construction cost, ensures the construction quality, and has remarkable application prospect, social and economic values.

Description

Center measuring, positioning and adjusting device of hydraulic generator

Technical Field

The utility model relates to a power station hydraulic turbine maintenance field, hydraulic generator central measurement location adjusting device promptly. The instrument is used for measuring, positioning and adjusting the center and the elevation of the unit.

Background

In the prior art, the fixed parts of the mixed-flow type hydroelectric generating set of the hydropower station are as follows: the upper frame, the stator, the top cover, the upper leakage stopping ring and the lower leakage stopping ring. The connecting line of the geometric centers of the fixed parts is called the center line of the unit. Among these fixed parts, the center of the generator stator and the turbine leak-stopping ring is the key to the safe and stable operation of the unit. Therefore, for the mixed-flow type unit, the center line of the unit is a connecting line of the average center of the stator of the generator and the average center of the fixed leakage-stopping ring of the water turbine. Obviously, when the mixed flow type water turbine generator set is installed, the center of the stator of the generator, the center of the guide bearing and the center of the lower leakage stopping ring of the water turbine are preferably adjusted to be on the same vertical line, namely, the ideal central line of the mixed flow type water turbine generator set is a plumb line.

The adjusting work of the installation center of the new stator of the power station unit needs to use the fixed leakage-stopping ring on the seat ring as a reference surface, but when the leakage-stopping ring under the unit is not the fixed leakage-stopping ring, because the size of the lower ring of the rotating wheel is larger than that of the lower leakage-stopping ring, the lower leakage-stopping ring needs to be detached and lifted out when the rotating wheel goes out of a pit, and because the thickness of the lower leakage-stopping ring is too thin, the lower leakage-stopping ring needs to be adjusted and positioned again after being installed every time and cannot be used as the reference for measuring the center of the new stator. Under normal conditions, the upper leakage-stopping ring on the top cover can be used as a reference for positioning a new stator, but the upper leakage-stopping ring on the top cover is seriously corroded due to long-time operation, the surface of the upper leakage-stopping ring is uneven, and the reference for adjusting the center of the stator cannot be made.

According to the prior art, the new stator is not accurately positioned through the bottom ring, the lower leakage-stopping ring and the upper leakage-stopping ring on the top cover, the center of the unit is determined by comprehensively considering the center of the old stator, the center of the lower leakage-stopping ring and the center of the upper leakage-stopping ring, and an auxiliary adjusting device for measuring and positioning the center of the unit independent of the three positions is designed, so that the relative deviation of the three positions can be reduced to the minimum, and the requirement of positioning the center of the unit can be completely met. Thereby ensuring the replacement of the upper leakage-stopping ring on the top cover, the positioning of the central processing position and the checking precision of the central position after the replacement. Meanwhile, the installation, center adjustment and elevation adjustment of the new stator can be smoothly carried out during the process of returning the top cover to the factory, and the on-line completion of the unit expanding and repairing work is ensured.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the aforesaid not enough and provide a simple structure, measuring method is simple, has guaranteed measurement accuracy's hydraulic generator center and has measured positioning adjustment device.

The technical solution of the utility model is that: the center measuring, positioning and adjusting device of the hydraulic generator is characterized by comprising a fixed support, wherein a basic flange plate is arranged on the fixed support, four screw caps are fixed on the surface of the basic flange plate at intervals of 90 degrees, a bolt jackscrew is screwed on each screw cap, and an adjustable flange plate is connected in the middle of the four bolt jackscrews in a jacking mode.

Selecting a position by the device: the position selection place approaches to the center, and a large bracket does not need to be manufactured. The device self-positioning mode: and an upper device and a lower device are adopted to realize self-positioning and ensure positioning precision. The improvement of the process method comprises the following steps: the self-positioning is adopted, a single positioning process method is changed, the original large positioning error at one position is changed, and the artificial measurement error is reduced. Three points define a straight line, and the positions of all the devices on the straight line can be ensured.

The utility model has the advantages that: 1. the device is applied, and the problems that the center positioning precision of the unit is not accurate and the like caused by the damage and the deformation of the measuring surface of the bottom ring and the lower leakage-stopping ring in the process of transforming the old unit are solved. Meanwhile, a new datum point is provided for stator elevation adjustment and verification, and a new verification and adjustment means is provided for stator elevation adjustment accuracy. The problem of because of the top cap returns factory processing period, stator center, engineering adjustment work stagnation influence maintenance time limit for a project and stator installation progress is solved, the stator is reformed transform and is overhauld going on smoothly of progress has been guaranteed. The problem of top cap stop leak ring change new stainless steel stop leak ring processing location inaccurate is solved, for the last top cap of ring processing front location with process the back effect processing displacement deviation of accomplishing provide a new instrument method, guaranteed going on smoothly of top cap stop leak ring processingquality, precision and unit center adjustment work. 2. Through adopting old stator center, the top dead leakage ring center of old top cap and removable dress down the center of leak-stopping ring to verify the adjustment auxiliary positioning device center, avoided the too big problem of error that three centers are inaccurate to bring, verified the degree of accuracy of having guaranteed the unit center, provide the guarantee for follow-up new stator center adjustment accuracy, progress. 3. Because the device has small overall dimension, the processing, installation and measurement precision can be ensured more easily, so that the measurement personnel can operate and adjust easily, the measurement errors of human and measuring tools are reduced, and the accuracy of the new stator center positioning is ensured. 4. The design and application of the device provide a new tool for the center positioning and the roundness adjustment of the non-fixed lower leakage-stopping ring, the coaxiality of the upper leakage-stopping ring and the lower leakage-stopping ring is ensured, a centering device is not required to be arranged on a stator, and the problem of overlarge error caused by overlong measuring ruler and piano wire swinging is avoided. 5. The device is applied to provide a new measuring and positioning tool for the transformation of an old unit under the same condition, and is particularly suitable for a unit with a bottom ring, a non-fixed lower leakage-stopping ring and a top cover upper leakage-stopping ring reference surface which are seriously damaged and a unit center positioning reference which is damaged. 6. The device has the advantages of simple structure, easy processing, convenient assembly and disassembly, simple measuring method and high measuring precision, can realize the manufacturing, processing, installation and measurement on a construction site without a large number of precise instruments and professional measurement teams, is convenient for operation and implementation of construction units, saves the construction cost, ensures the construction quality, and has remarkable application prospect, social and economic values.

Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic view of the structure of the present invention.

Fig. 2 is an installation schematic diagram of the present invention.

Fig. 3 is a schematic view of the center measurement of the present invention.

FIG. 4 is a schematic view of the center measurement of the upper and lower leakage-stopping rings.

Detailed Description

Referring to fig. 1-4, the part names are as follows: the device comprises a fixed support 1, a basic flange plate 2, a screw cap 3, a bolt jackscrew 4, an adjustable flange plate 5, a cross air supplement frame 6, a lower leak-stopping ring 7, an upper leak-stopping ring 8, a top cover 9, a tail water platform 10, a cross air supplement frame platform 11, a fixed water guide vane 12, a stator 13, a centering device 14, a measuring frame 15, a stator platform 16, a machine pit 17, an oil drum 18 and a volute 19.

Referring to fig. 1 and 2, the center measuring, positioning and adjusting device of the hydraulic generator comprises a fixed support 1 (four supporting legs which are uniformly distributed), a base flange 2 is arranged on the fixed support 1, four nuts 3 (or fixed seats) are fixed on the surface of the base flange 2 at intervals of 90 degrees, bolt jackscrews 4 are transversely screwed on each nut 3, and an adjustable flange 5 is connected to the centers of the four bolt jackscrews 4 in a propping manner.

By adopting the adjustable double-flange structure, the requirement of horizontal adjustment can be ensured, and the requirement of accurate positioning of the center can be met. The diameter of the inner opening of the adjustable flange 5 is 400mm, and the tolerance is guaranteed to be within +/-0.05 mm, so that the accuracy of reading calculation is guaranteed, and the fatigue degree of operators is reduced.

The center of the unit is determined by comprehensively considering the center positions of the old stator, the lower leakage-stopping ring and the upper leakage-stopping ring, and a set of auxiliary adjusting device for center measurement and positioning independent of the three positions is designed, so that the relative deviation of the three positions can be reduced to the minimum, and the requirement of center positioning of the unit can be completely met.

The manufacturing of the positioning device comprises the following specific operation execution steps:

designing a processing drawing, wherein two sets of devices respectively comprise four parts, namely a phi 400 multiplied by a phi 500 multiplied by 15mm of a finish machining adjustable flange plate 5, a phi 450 multiplied by a phi 550 multiplied by 15mm of a basic flange plate 2, four sets of adjusting screw sets and four fixed supports 1. The adjusting screw group set is composed of a stainless steel M10 screw as a top thread, an M10 stainless steel nut 3 as a locking cap and a 30 x 15 stainless steel square block for drilling an M10 bolt hole as a fixing frame.

During processing, the parallelism of the upper plane and the lower plane of the adjustable flange 5 is not allowed to be more than 0.02mm/m, the roundness of the inner ring of the flange is not more than +/-0.02 mm, and the surface roughness of a processed surface reaches 6 levels. The parallelism of the upper plane and the lower plane of the basic flange plate 2 is required not to be more than 0.02mm/m, and the finish degree of a processing surface reaches 6 grades. And after the device is processed, assembling according to design requirements.

Installation and use methods apply: referring to fig. 2, the cross-shaped air supplement frame 6 is designed on the basis that the cross-shaped air supplement frame 6 is close to the center of the unit (the installation of the long station cross-shaped air supplement frame requires that the deviation of the center position is not more than 5mm, and the deviation of the installation elevation is not more than 2 mm.), and the cross-shaped air supplement frame 6 is high in structural strength, good in anti-vibration effect and not easy to deform and bend, so that the cross-shaped air supplement frame is the optimal position for installing the device. Meanwhile, in order to ensure the measurement precision and avoid measurement errors, a set of adjustable positioning device is respectively arranged above and below the cross air supplement frame 6, so that the central position and the elevation of the machine set component after being completely disassembled can be ensured to be unchanged.

Referring to fig. 2, the adjusting device is installed (one set is installed up and down respectively), wherein the fixing mode and the fixing method of the upper adjustable flange 5 and the lower adjustable flange 5 are the same, firstly, the basic flange 2 is adjusted to the central position of the cross air supplement frame 6, then the upper plane X, Y direction of the basic flange 2 is leveled by a phase combination level meter, and the horizontal deviation is not more than 0.02 mm/m. And then welding the joint of the fixed support 1 and the cross-shaped gas supplementing frame 6 (the upper fixed support 1 is in seat joint with the cross-shaped gas supplementing frame 6, and the lower fixed support 1 is in suspension joint with the cross-shaped gas supplementing frame 6) after the adjustment is finished, and preventing welding deformation in the welding process. Finally, the adjustable flange 5 is fixed on the basic flange 2 by using an adjusting screw group.

The central position of the adjusting device is determined:

referring to fig. 3, the part names are as follows: the device comprises a cross air supplement frame 6, a lower leakage-stopping ring 7, an upper leakage-stopping ring 8, a top cover 9, a tail water platform 10, a cross air supplement frame platform 11, a fixed water guide vane 12, a stator 13, a centering device 14, a measuring frame 15, a stator platform 16, a machine pit 17, an oil drum 18 and a volute 19.

A centering device 14 is mounted on the stator 13 and leveled. The piano wire of the center finder is put down to the tail water pipe, and the heavy hammer is hung.

And adjusting the centering device 14 to a central position according to a set center adjusting method.

And measuring the corresponding central position data of the upper leakage-stopping ring 8 and the lower leakage-stopping ring 7 according to the existing position of the piano wire and the measuring point position of the stator 13.

And determining the central position data of the unit according to the comprehensive analysis of three data of the stator 13, the upper leakage-stopping ring 8 and the lower leakage-stopping ring 7, and adjusting the piano wire of the centering device to the corresponding position according to the central position data.

The distance between the upper and lower adjustable flange plates 5 (upper and lower sets) of the adjusting device and the piano wire of the centering device is measured, the adjustable flange plates 5 are adjusted to be arranged in the center position, the nuts 3 are tightened, and data recording and protection are well performed.

The device has the following steps of determining the elevation: determining an elevation measurement datum point on a generator layer, setting an optical level (the precision of the level is 0.01 mm), observing the heights of the precision leveling staff and the datum point, recording data, moving the precision leveling staff to the center of an old stator, measuring the height of the precision leveling staff by using the optical level, calculating the height difference between the stator and the datum point, and recording the data. And moving the level gauge to the center position of the stator for calibration, moving the precision leveling staff to the upper plane of the adjustable flange of the auxiliary positioning adjusting device, measuring the relative distance between the adjustable flange 5, the top cover and the center of the stator by using the level gauge, calculating the elevation data of the datum point, and recording the data.

Adjusting the center and the elevation of the new stator:

eight sets of wedge plates for horizontal elevation adjustment are arrangedOn the basis of the stator foundation, the surface of the foundation should be cleaned up without high points.

And hoisting the whole new stator into the machine pit and placing the new stator on the eight groups of wedge-shaped plates.

And measuring the level condition of the upper plane of the stator, and adjusting the wedge-shaped plate to ensure that the level of the stator is not more than 0.05 mm/m.

And installing a centering device, and hanging the heavy hammer as required. The adjustable flange center position of the auxiliary positioning adjusting device is measured, the piano wire of the centering device is adjusted to correspond to the original center data, and the adjusting error is not more than +/-0.02 mm.

And measuring the relative deviation between the center of the new stator and the center of the piano wire until the center of the new stator and the horizontal deviation are adjusted to meet the installation requirement.

And calculating the processing data of 8 base backing plates of the stator, and processing a new backing plate.

And after the processing is finished, synchronously jacking the new stator, extracting the adjusting wedge-shaped plate, loading the new stator into the base cushion plate, tightly fastening the new stator with the stator support, dropping the new stator, and verifying the center position of the stator after the top cover is returned to a factory for processing.

Center measurement of each part of the unit:

referring to fig. 4, the part names are as follows: the device comprises a cross air supplement frame 6, a lower leakage-stopping ring 7, an upper leakage-stopping ring 8, a top cover 9, a tail water platform 10, a cross air supplement frame platform 11, a fixed water guide vane 12, a stator 13, a centering device 14, a measuring frame 15, a stator platform 16, a machine pit 17, an oil drum 18 and a volute 19.

After the top cover 9 returns, the top cover 9 is hung in, the positioning pin is tightened, and a half of the top cover bolt is installed and tightened.

A centering device 14 is arranged on the top cover 9, and the heavy hammer is hung well. And adjusting the steel wire rope of the ball center device to the center of the auxiliary positioning adjusting device, wherein the adjusting error is not more than +/-0.02 mm.

And measuring the central data of the processed top cover 9 of the leak-stopping ring 8, comparing the central data with the central data before returning to the factory, and checking whether the processing deviation meets the processing technical requirements.

And adjusting the central position of the lower leakage-stopping ring 7 according to the central data of the upper leakage-stopping ring 8, wherein the allowable deviation of concentricity of the upper and lower leakage-stopping rings 8 and 7 is not more than 0.15 mm.

After the measurement and adjustment work of the upper and lower leakage-stopping rings 8 and 7 is finished, a centering device 14 is arranged on the new stator according to requirements and centered, and the data of the verification and the stator center deviation are qualified.

And after the central measurement work is finished, welding the stator foundation plate.

And (5) verifying the horizontal and central deviation of the welded stator 13 again, and removing the centering device 14 and the adjusting device after meeting the regulation requirement.

The above description is only exemplary of the present invention, and the various illustrations do not limit the essence of the present invention.

Claims (1)

1. The center measuring, positioning and adjusting device of the hydraulic generator is characterized by comprising a fixed support (1), a basic flange (2) is arranged on the fixed support (1), four nuts (3) are fixed on the surface of the basic flange (2) at intervals of 90 degrees, a bolt jackscrew (4) is screwed on each nut (3), and an adjustable flange (5) is connected in the middle of the four bolt jackscrews (4).

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