CN117155033A - Exciter rotor swing degree adjusting method and adjusting system - Google Patents

Abstract

The invention discloses an exciter rotor swing degree adjusting method and an adjusting system, wherein the adjusting method comprises the following steps: the exciter wheel set and the generator wheel set are connected through bolts, initial moment is applied to each bolt, a special support for the swing degree is arranged on the middle split surface of the bearing seat of the exciter machine, and a jigger device is arranged on the rotor of the generator; starting a jigger device, and measuring the swing degree of the shaft neck of the exciter rotor as the actual swing degree; calculating the ladybug deviation of the excitation pair wheel according to the swing degree to be used as an actual ladybug deviation; and determining a laddering correction amount according to the numerical value of the laddering and the laddering qualified range, and adjusting the fastening moment of each bolt on the exciter pair wheel and the generator pair wheel according to the laddering correction amount until the laddering of the exciter pair wheel is reduced to the laddering qualified range. The invention solves the problems that the swing degree of the exciter rotor cannot be adjusted to meet the swing degree qualified range and the same procedure is repeatedly executed because the deviation of the exciter to the wheel is not in the ladle deviation qualified range.

Description

Exciter rotor swing degree adjusting method and adjusting system

Technical Field

The invention relates to the field of generator overhaul, in particular to a method and a system for adjusting the swing degree of an exciter rotor.

Background

When the exciter is connected with the generator, the exciter rotor is connected with the generator rotor through a rigid coupling, the front end of the exciter rotor is suspended on the generator rotor, and the rear end of the exciter rotor is supported by a single-shaft tile. The weight of the generator is far greater than that of the exciter, after the exciter is connected with the generator, the exciter rotor can rotate in a conical shape around the generator rotor in the rotating process due to the weight, a certain degree of swing of the exciter rotor is generated in the rotating process, and centrifugal force generated by the degree of swing of the exciter rotor directly acts on the bearing to play a decisive role in vibration generated by the exciter rotor. Therefore, after the exciter is centered with the generator, the swing degree of the exciter rotor is required to be adjusted so as to ensure that the swing range of the swing degree of the exciter rotor is within the swing degree error range during normal operation; the swing degree of the exciter rotor refers to the difference between the maximum value and the minimum value of horizontal swing generated by the horizontal swing of the tail end of the exciter rotor caused by the fact that after the exciter rotor is centered with the generator rotor, the exciter rotor is influenced by factors such as the buckling of the end face of a centering wheel, bending of the exciter rotor and the like, in the rotating process, the axis of the generator rotor is not concentric with that of the exciter rotor when the generator rotor rotates, and the ball disc and the floating bearing bush do not restrict the horizontal movement of the exciter rotor.

At present, in the prior art, when the swing degree of the exciter rotor is adjusted, the swing degree of the exciter rotor is often adjusted by experience, and the swing degree adjusting method of the exciter rotor without a system is often used for adjusting the swing degree of the exciter rotor, which is caused by the fact that the swing degree of the exciter rotor cannot be adjusted to be in a range consistent with the swing degree error due to the fact that the original ladle deviation value error of the end face of the exciter rotor is large, so that the problem that the exciter pair wheel needs to be readjusted is solved, and the swing degree adjusting process of the exciter rotor is low in efficiency.

Disclosure of Invention

The invention aims to solve the technical problem of providing a method and a system for adjusting the swing degree of an exciter rotor.

The technical scheme adopted for solving the technical problems is as follows: the method for adjusting the swing degree of the exciter rotor comprises the following steps:

s1, connecting an exciter wheel set and a generator wheel set through bolts, applying initial moment to each bolt, installing a special support for the swing degree on the middle split surface of an exciter bearing seat, and installing a jigger device on a generator rotor;

s2, starting a jigger device, and measuring the degree of balance at the shaft neck of the exciter rotor to be used as actual ferry;

s3, calculating the ladybug deviation of the excitation pair wheel according to the swing degree, and taking the ladybug deviation as an actual ladybug deviation;

s4, determining a ladle deflection correction amount according to the numerical value of the ladle deflection and the ladle deflection qualified range, and adjusting fastening moment of each bolt on the exciter pair wheel and the generator pair wheel according to the ladle deflection correction amount until the ladle deflection of the exciter pair wheel is reduced to the ladle deflection qualified range.

Preferably, the step S2 includes: and a third displacement sensor is arranged on the outer peripheral surface of the shaft neck of the exciter rotor, a radial measurement value of the shaft neck of the exciter rotor corresponding to each bolt hole position on the end surface of the exciter pair wheel is measured, and a difference value between the maximum value and the minimum value in the radial measurement value is obtained, wherein the difference value is the swing degree.

Preferably, before step S1, the method further comprises S0, obtaining a laddering of the exciter wheel and the generator wheel as an initial laddering, and calculating a swing degree as an initial ferry according to the laddering; when the swing degree is not in the first range, firstly grinding and correcting the end face of the exciter pair wheel until the swing degree is in the first range; the first range is in the superposition range of the swing degree correction quantity corresponding to the swing degree qualified range and the laddering correction quantity.

Preferably, the ladybug offset correctable amount refers to a difference between axial compression amounts corresponding to maximum moment and minimum moment allowed to be applied on a bolt on the excitation pair wheel.

Preferably, in the step S3, the offset is determined according to a calculation process of a formula five, where the calculation process of the formula five is:

wherein JK is the wobble, CD is the axial length of the exciter rotor, FG is the offset of the exciter pair wheel, and EF is the diameter length of the exciter pair wheel.

Preferably, the relation between the laddering correctable amount and the bolt torque is determined by the calculation process of the formula four:

delta L is the axial compression quantity of the exciter to the wheel, and the unit is m; f is the pretightening force of the bolt, and the unit is N; l is the initial axial thickness of the compressed position of the exciter pair wheel, and the unit is m; e is the elastic modulus of the exciter pair wheel, and the unit is pa; a isThe contact area of the matching surfaces of the generator wheel 2 and the exciter wheel is m ² The method comprises the steps of carrying out a first treatment on the surface of the n is the number of bolts on the end face of the exciter wheel pair; t is the torque of the bolt, and the unit is Nm; m is the tightening torque coefficient of the bolt; d is the nominal diameter of the bolt, and the unit is m; d, d ₁ The unit is m for the outer diameter of the contact surface of the exciter wheel and the generator wheel; d, d ₂ The unit is m for the inner diameter of the contact surface of the exciter wheel and the generator wheel.

The invention also provides an exciter rotor swing adjustment system, which comprises:

the jigger module is arranged on the generator rotor and used for controlling the generator rotor to rotate and driving the exciter rotor to rotate;

the bolt fastening module is used for adjusting the moment of each bolt on the excitation pair wheel;

the measuring module is used for measuring the swing degree of the shaft diameter of the exciter rotor;

the data acquisition and analysis module is used for acquiring data of the data acquisition and analysis module,

the method comprises the steps that a buckling allowable range and a swing degree qualification range are set, the data acquisition and analysis module is used for receiving the swing degree of the exciter rotor, comparing the received swing degree of the exciter rotor, generating a comparison result, and generating a bolt moment adjustment scheme according to the comparison result;

and the control module is in communication connection with the data acquisition and analysis module and is used for controlling the bolt fastening module to adjust the moment on the bolt according to the bolt moment adjustment scheme.

Preferably, the measurement module includes:

the third displacement sensor is arranged at the shaft neck of the exciter rotor and is in communication connection with the data acquisition and analysis module and is used for measuring the swing degree of the exciter rotor; and

and the angle measuring unit is used for measuring the rotation angle of the rotor and is in communication connection with the data acquisition and analysis module.

Preferably, the third displacement sensor is a wireless dial indicator;

the angle measuring unit comprises an adsorption type spiral hole site mark adsorbed on the periphery of the exciter pair wheel and an eddy current sensor which is arranged on the outer ring of the exciter pair wheel and points to the adsorption type spiral hole site mark.

Preferably, an external meshing gear is arranged on the jigger module and meshed with a gear on the generator rotor so as to drive the generator rotor to rotate;

the bolt fastening module comprises electric wrenches sleeved on end face bolts of the exciter rotor pair wheels, and each bolt is sleeved with one electric wrench.

The implementation of the invention has the following beneficial effects: in the process of adjusting the swing degree of the exciter rotor, firstly measuring the swing degree of a shaft neck of the exciter rotor, calculating the deflection of the exciter rotor according to the swing degree, determining the deflection correction amount according to the deflection and the deflection qualified range, correcting the deflection of the exciter rotor to the deflection qualified range, and further adjusting the swing degree of the exciter rotor, thereby avoiding the problem that the swing degree of the exciter rotor cannot be adjusted to be in accordance with the deflection qualified range because the deflection of the exciter rotor is not in the deflection allowable range in the process of adjusting the swing degree of the exciter rotor; meanwhile, the deflection of the exciter pair wheel is not required to be adjusted for multiple times, the problem that the same procedure is repeatedly executed is avoided, and the swing degree adjusting efficiency of the exciter rotor is improved.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a flow chart of a method of adjusting the rotor throw of an exciter in accordance with the present invention;

FIG. 2 is a schematic illustration of the installation of an exciter rotor and a generator rotor of the present invention;

FIG. 3 is a front view of the exciter rotor of the present invention;

FIG. 4 is a block diagram of an exciter rotor throw adjustment system of the present invention;

FIG. 5 is a front view of an exciter rotor pair wheel of the present invention;

FIG. 6 is a schematic view of an eddy current sensor installation of the invention;

FIG. 7 is a schematic illustration of the exciter rotor and exciter rotor pair wheel of the present invention without a scoop deviation;

fig. 8 is a schematic illustration of the exciter rotor and exciter rotor pair wheel of the present invention.

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 one of ordinary skill in the art without undue burden from the present disclosure, are intended to be within the scope of the present disclosure.

In a preferred embodiment, referring to fig. 1, the present invention provides a method for adjusting the swing of an exciter rotor 5.

Specifically, the method for adjusting the swing degree of the exciter rotor comprises the following steps:

step S0: acquiring initial buckling deflection of the exciter wheel set 1 and the generator wheel set 2, calculating to obtain initial buckling deflection of the exciter wheel set fastened together according to the two initial buckling deflection, calculating the swing degree according to the initial buckling deflection, and when the swing degree is not in a first range, firstly grinding and correcting the exciter wheel set 1 until the swing degree is in the first range; the first range is within the superposition range of the swing correction amount corresponding to the swing qualified range and the laddering correction amount.

In this step, the initial buckling of exciter pair wheel 1 and generator pair wheel 2 are obtained first. Specifically, two first displacement sensors may be installed on the end face of the generator wheel set 2 (the end face for contacting with the exciter wheel set 1), where the two first displacement sensors are 180 ° (i.e. the connection line of the two first displacement sensors crosses the center of the generator wheel set), and during the rotation of the generator rotor 8, one half of the axial displacement difference of the end face of the generator wheel set 2 measured by the two first displacement sensors is the offset of the generator wheel set 2, that is: the end faces of the generator pair wheels 2 are not perpendicular relative to the rotation center of the generator rotor 8. In this process, the probe of the displacement sensor is parallel to the center axis of the generator rotor 8 with reference to the center axis of the generator rotor 8.

In this embodiment, the first displacement sensor may be a wireless dial indicator. Alternatively, in other alternative embodiments, the first displacement sensor may be a wired dial indicator.

The same measurement method as the slip of the generator wheel 2 can be used and two second displacement sensors are used to measure the slip of the end face of the exciter wheel 1 (referred to as the end face for contact with the generator wheel 2), during which the centre axis of the exciter rotor 5 is referenced, the probes of the second displacement sensors being parallel to the centre axis of the exciter rotor 5. And will not be described in detail herein.

The offset of the generator wheel 2 is overlapped with the offset of the exciter wheel 1, so that the initial offset of the exciter wheel fastened together can be obtained.

In addition, when the generator pair wheel 2 and the exciter pair wheel 1 are superimposed, the generator pair wheel and the exciter pair wheel 1 should be attached according to a specific orientation (corresponding to bolt holes respectively), and the exciter pair wheel refers to that the wheels of the exciter and the generator are connected together through bolts.

The excitation wheel set is used as an initial deflection, the swing degree of the exciter rotor 5 is calculated according to the initial deflection, the swing degree is the initial swing degree, and when the swing degree of the exciter rotor 5 is not out of the first range, the grinding correction is firstly carried out on the exciter wheel set 1 until the swing degree of the exciter rotor 5 is in the first range. In this embodiment, the first range belongs to a hunting correction amount overlapping range corresponding to the hunting qualified range and the laddering correction amount. The swing degree of the exciter rotor 5 is determined through a calculation process of a formula five, wherein the calculation process of the formula five is as follows:

JK is the swing degree and the unit is m; CD is the axial length of the exciter rotor 5 in m; FG is the offset in m; EF is the diameter length of the exciter pair wheel 1 in m.

At the bookIn the embodiment, the axial length of the exciter rotor 5 is 4.1m, and the diameter length of the exciter pair wheel 1 is 0.778m. For example: when the measured deflection of the exciter to the wheel 1 is 0.4 x 10 ^-4 m, the swing degree of the exciter rotor 5 can be calculated to be 4.22 multiplied by 10 according to a formula five ^-3 m。

The acceptable range of the swing degree is the allowable maximum deviation range after the generator and the exciter are connected in a matched mode, and the allowable maximum deviation range is usually defined at the shaft neck of the generator. For a particular model of generator and exciter, the acceptable range of runout is determined, particularly based on the factory requirements of the generator and exciter. For example, in one embodiment, the range of acceptable throw requirements is 0-0.12mm.

The ladybug correctable amount is related to the pretightening force of the adjusting bolt on the end face of the exciter pair wheel 1, and the ladybug correctable amount refers to the difference between the axial compression amounts of the exciter pair wheel when the minimum torque and the maximum torque are applied to the bolt on the exciter pair wheel. In practical application, the torque of the bolt on the exciting pair wheel is not applied and regulated limitlessly, and has a maximum torque and a minimum torque, so that the correction amount of the ladle deviation is determined according to the maximum torque and the minimum torque which can be applied on the bolt.

The relation between the axial compression amount and the pre-tightening force of the excitation pair wheel can be determined through a calculation process of a formula I, and the pre-tightening force of an upper bolt of the excitation pair wheel can be determined according to a calculation process of a formula II;

the calculation process of the formula I is as follows:

the calculation process of the formula II is as follows:

the calculation process of the fourth formula can be deduced according to the first and second formulas, so that the calculation process of the fourth formula can be determined by the calculation process of the fourth formula when the axial compression amount of the excitation pair wheel is calculated, and the calculation process of the fourth formula is as follows:

as can be seen from the calculation process of the formula four or the formula one and the formula two, when calculating the ladybug correction amount, the pretightening force of the excitation pair wheel and the contact area of the matching surfaces of the exciter pair wheel 1 and the generator pair wheel 2 need to be obtained. The contact area of the mating surfaces of the exciter wheel pair 1 and the generator wheel pair 2 can be determined through the calculation process of a formula III, wherein the calculation process of the formula III is as follows:

delta L is the axial compression amount generated when T torque is applied to a position, corresponding to a certain bolt, on the excitation pair wheel, and the unit is m; f is the pretightening force of the bolt, and the unit is m; l is the initial axial thickness of the excitation pair wheel corresponding to a certain bolt, wherein the unit is m, and the initial thickness refers to the axial thickness when the end surfaces of the excitation pair wheel 1 and the generator pair wheel 2 are mutually contacted together and the torque applied to the bolt is 0; e is the elastic modulus of the exciter pair wheel 1, and the unit is pa; a is the contact area of the matching surface of the generator wheel set 2 and the exciter wheel set 1, and the unit is m ² The method comprises the steps of carrying out a first treatment on the surface of the n is the number of adjusting bolts on the end face of the exciter wheel pair 1; t is the torque of the adjusting bolt, and the unit is Nm; m is the tightening torque coefficient of the adjusting bolt; d is the nominal diameter of the adjusting bolt, and the unit is m; d, d ₁ The unit is m for the outer diameter of the contact surface of the exciter wheel set 1 and the generator wheel set 2; d, d ₂ The unit is m for the inner diameter of the contact surface of the exciter counter wheel 1 and the generator counter wheel 2.

The laddering correctable amount is calculated as follows by way of example.

For example, in one embodiment, the initial axial thickness L on the excitation pair wheel corresponding to a bolt is 0.18M, the machine design manual is queried, M is 0.15, e is 220×10 ⁹ pa, n is 22, d is 0.03m, and the outer diameter d of the contact surface of the exciter counter wheel 1 and the generator counter wheel 2 ₁ D of contact surface of exciter wheel set 1 and generator wheel set 2 is 0.773m ₂ The inner diameter is 0.7428m.

In one embodiment, the maximum torque is 1930Nm, the minimum torque is 1650Nm, and when the minimum torque is 1650Nm, the minimum torque 1650Nm is substituted into T in the calculation of the formula IV, and the corresponding axial compression amount of the excitation pair wheel at the moment can be determined to be 1.8X10 through the calculation of the formula IV ^-4 m, when the maximum torque is 1930Nm, substituting the maximum torque 1930Nm into T in the calculation process of the formula IV, and determining that the axial compression amount of the corresponding excitation pair wheel is 2.1 multiplied by 10 in the calculation process of the formula IV ^-4 The difference between the axial compression of the exciter pair wheel 1 corresponding to the minimum moment 1650Nm and the axial compression of the excitation pair wheel corresponding to the maximum moment 1930Nm is the laddering correctable amount of 0.03mm (namely, (2.1-1.8) multiplied by 10) ^-4 ＝3×10 ^-5 m)。

In other embodiments, the maximum torque of the adjusting bolt of the exciter to the end face of the wheel 1 is not limited to 1930Nm, and likewise, the minimum torque is not limited to 1650Nm, which is specifically related to the parameters of the bolt applied to the field excited wheel.

After the laddering correctable amount is determined, the corresponding swing correction amount is determined according to the laddering correctable amount.

Specifically, the yaw correction amount corresponding to the laddering correctable amount may be determined according to the calculation process of the fifth formula. Wherein FG has a take-in value of laddering correctable amount (e.g., 3×10 ^-5 m), determining the corresponding yaw correction amount (for example, 3×10) of the laddering correctable amount by the fifth calculation of the formula ^-4 m)。

From the above, the first range is within the range of overlap of the allowable swing error range and the swing correction amount corresponding to the laddering correction amount, and it is found that the first range is (0 to 4.2X10 ^-4 ) m. When the wobble of the exciter rotor 5 is not in the first range, the wobble of the exciter rotor 5 may be adjusted by grinding until the wobble of the exciter rotor 5 is in the first range.

Here, for the sake of conservation, in order to reduce the slip of the excitation wheel after the grinding correction to a range that can be corrected by adjusting the bolt torque, the first range is smaller than the yaw correction amount overlapping range corresponding to the yaw qualified range and the slip correctable amount. Of course, the range herein means that the maximum value of the first range is smaller than the maximum value of the hunting correction amount superimposing range corresponding to the hunting qualified range and the laddering correction amount. As described above, the requirement of the qualified range of the swing degree is 0-0.12mm, the corresponding swing degree correction amount of the ladybug correction amount is 0.3mm, the superposition range of the swing degree correction amounts of the qualified range of the swing degree and the ladybug correction amount is 0-0.42mm, namely the first range can be 0-0.42mm, wherein the first range can be slightly smaller than the range for conservation, for example, the first range can be 0-0.40mm or 0-0.35mm or other numerical ranges.

Step S1: the exciter wheel set 1 and the generator wheel set 2 are connected through bolts, and the moment of the bolts is the initial moment; a special support for the swinging degree is arranged on the middle split surface of the bearing seat of the exciter, a jigger module is arranged on the generator rotor 8, and a third displacement sensor is arranged on the special support for the swinging degree. The initial torque is equal to or greater than the minimum torque and equal to or less than the maximum torque.

In this step, as shown in fig. 2 and 3, the exciter counter wheel 1 and the generator counter wheel 2 are connected to each other, and a special-purpose bracket for the yaw is installed on the center of the exciter bearing block so as to support the exciter rotor. The special support for the swing degree comprises a rigid lower support part and a flexible upper support part, wherein the upper support part is connected to the lower support part, the lower support part is used for providing rigid support for the upper support part, and the upper support part flexibly supports the exciter rotor so as to reflect the axial deflection of the exciter rotor relative to the axial direction of the generator rotor in the process of rotating along with the generator rotor as accurately as possible.

And a third displacement sensor is arranged on the special support for the swing degree, and the swing degree of the shaft neck of the exciter rotor 5 is measured through the third displacement sensor. The third displacement sensor may be a wireless dial indicator or other displacement sensor.

Step S2: the jigger is started, and the degree of throw at the journal of the exciter rotor 5 is measured as the actual degree of throw by the third position sensor described above. In this step, the throw at the journal of the exciter rotor 5 is measured by a wireless dial gauge mounted on a special bracket for throw. Specifically, after the jigger module is started, a radial measurement value of the journal of the exciter rotor 5 corresponding to each bolt hole position on the end face of the exciter pair wheel 1 is measured through a wireless dial indicator on the special support for the swing degree. In this embodiment, it is necessary that the exciter pair wheel 1 rotates one revolution to measure radial measurement values at all journals, and a maximum value and a minimum value are obtained from the measured radial measurement values at all journals, wherein the difference between the maximum value and the minimum value is the degree of wobble at the journals of the exciter rotor 5.

S3: the slip of the exciter to the wheel 1 is calculated as an actual slip from the degree of throw (actual degree of throw) in step S2.

In this step, the corresponding deflection of the exciter pair wheel 1 is calculated according to the above-mentioned measured deflection, according to the calculation process of the formula five, wherein the brought value of JK is the deflection at the journal of the exciter rotor 5 measured in this step.

S4: according to the value of the actual ladle deflection of the excitation pair wheel and the ladle deflection qualified range, determining ladle deflection correction quantity, and according to the ladle deflection correction quantity, adjusting the fastening moment of each adjusting bolt on the exciter pair wheel 1 and the generator pair wheel 2 until the ladle deflection of the excitation pair wheel is reduced to be within the ladle deflection qualified range.

In this step, the acceptable range of the ladle is determined according to the specific type and matching relationship of the generator and the exciter, for example, in one embodiment, the acceptable range of the ladle is set to be required to be 0mm-0.02mm. After the actual deflection of the exciter rotor 5 is measured, determining the actual deflection of the exciter wheel 1 according to a calculation process of a formula five, wherein the deflection correction amount refers to a difference value between the actual deflection of the excitation wheel and the deflection qualified range when the actual deflection of the excitation wheel is not in the deflection qualified range, and fastening bolts on the exciter wheel 1 and the generator wheel 2 according to the deflection correction amount until the actual deflection of the excitation wheel is adjusted to the deflection qualified range.

According to the difference between the maximum torque and the minimum torque and the correction amount of the laddering in the step S0, the corresponding laddering correction value can be determined when the preset torque is adjusted on the bolt. The predetermined torque refers to an increase and decrease value of the torque each time the bolt is adjusted, for example, 50Nm is taken as a single increase and decrease value when the bolt torque is adjusted.

Taking 50Nm as an example, each time 50Nm is applied to a bolt, the corresponding correction value of the deflection of the exciter to the wheel 1 is 5.5X10 ^-6 m (i.e., 1.8X10) ^﹣4 /(1650/50) m). Taking 100Nm as an example, the correction value of the laddering correction value of the excitation pair wheel corresponding to each 100Nm application is 1.09 multiplied by 10 ^-5 m (i.e., 1.8X10) ^﹣4 /(1650/100)m)。

It should be noted that the pivotable correction amount is independent of the moment applied by the adjusting bolt each time. The present embodiment will be described by taking 50Nm and 100Nm applied to the adjusting bolt as examples. In other alternative embodiments, other values of the single bolt torque adjustment value may be selected according to actual application requirements, etc.

In the present embodiment, the ladle offset correction amount is 1.1X10 ^-5 m, the single adjustment of the applied moment of 50Nm is exemplified, and it is known from the above-described process of determining the laddering correctable amount that the laddering correctable amount of the corresponding exciter pair wheel 1 is 5.5X10 at each time of 50Nm moment application ^-6 m, therefore, when the ladybug deviation correction amount is 1.1X10 ^-5 And m, applying a torque of 50Nm to the adjusting bolt twice, and adjusting the ladle deflection of the exciter pair wheel 1 to a ladle deflection qualified range.

As shown in fig. 4, the present invention also provides an exciter rotor swing adjustment system for swing adjustment of the exciter rotor 5. The exciter rotor throw adjustment system may include: the device comprises a jigger module, a bolt fastening module, a measuring module, a data acquisition and analysis module and a control module. Specifically, the jigger module and the bolt fastening module are all in communication connection with the control module, the measuring module is in communication connection with the data acquisition and analysis module, and the data acquisition and analysis module is also connected with the control module. The jigger module is arranged on the generator rotor and is used for driving the generator rotor to rotate and driving the exciter rotor to rotate according to a control signal of the control module; the data acquisition and analysis module is provided with a deflection allowable range and a deflection qualified range, and is used for receiving the deflection of the exciter rotor, comparing the received deflection of the exciter rotor to generate a comparison result, and generating a bolt moment adjustment scheme according to the comparison result; the control module controls the bolt tightening module to adjust the moment on the bolt according to the bolt moment adjustment scheme.

In this embodiment, the measurement module may be used to measure the slip of the generator wheel 2, the slip of the exciter wheel 1, the throw at the journal of the exciter rotor 5, and the rotor rotation angle of the exciter wheel 1, i.e. the excitation wheel rotation angle. Wherein the ladder offset value of the exciter wheel 1 refers to the non-perpendicularity of the end face of the exciter wheel 1 relative to the rotation center of the exciter rotor 5, and the ladder offset value of the generator wheel 2 refers to the non-perpendicularity of the end face of the generator wheel 2 relative to the rotation center of the generator rotor 8. As shown in fig. 7, this is an indication that no slip exists in the excitation pair wheel. As shown in fig. 8, a slip of the excitation pair wheel is shown. The ladybug deflection of the excitation pair wheel refers to the non-perpendicularity of the end face of the generator pair wheel 2 relative to the rotation center of the generator rotor 8. The wobble degree of the exciter rotor 5 refers to the difference between the maximum value and the minimum value of the radial measurement values of the outer circumference at the journal of the exciter rotor 5 acquired during one rotation of the exciter rotor 5. The rotor rotation angle of the exciter rotor 5 means an angle by which the exciter pair wheel 1 is rotated compared to the set 0 °.

In particular, the measurement module may comprise a first displacement sensor, a second displacement sensor, a third displacement sensor 6, and an angle measurement unit. The first displacement sensor may be used to measure the laddering of the wheel 2 of the generator, and the second displacement sensor may be used to measure the laddering of the wheel 1 of the exciter, and the specific measurement method is described above and will not be described here. As shown in fig. 5, the third displacement sensor 6 is used for measuring the swing degree of the exciter rotor 5, one or more third displacement sensors 6 may be provided, and the measuring end of the third displacement sensor 6 is connected to the outer periphery of the position of the journal on the exciter rotor 5, and is used for measuring the displacement of the outer periphery of the position of the journal in the radial direction during the rotation of the exciter rotor 5, and when a plurality of third displacement sensors 6 are used, the average value can be obtained.

In an embodiment, the first displacement sensor, the second displacement sensor and the third displacement sensor 6 may be wireless dial indicators, respectively, and at this time, the measurement module and the data acquisition and analysis module are in wireless communication connection; of course, in other alternative embodiments, the first displacement sensor, the second displacement sensor and the third displacement sensor 6 are wired dial indicators and are connected to the data acquisition and analysis module through wired communication.

As shown in fig. 6, the angle measuring unit may include a mark detachably provided at the bolt hole site 11 and a fourth sensor for sensing the mark and transmitting a signal to the data acquisition and analysis module during rotation of the exciter rotor so that the data acquisition and analysis module can learn the angle of the exciter rotor at this time, and thus can learn the laddering at different bolt hole sites.

The types of the marks at the bolt holes and the fourth sensor are not limited, and the fourth sensor can sense all marks.

For example, in one alternative embodiment, labeled as the absorption bolt hole label 4, the fourth sensor is the eddy current sensor 3. Specifically, the exciter wheel pair 1 is provided with adsorption type bolt hole marks 4, the adsorption type bolt hole marks 4 are adsorbed on the outer circumferential surface of the exciter wheel pair 1 and correspond to the bolt hole positions, along with the rotation of the exciter wheel pair 1, the eddy current sensor 3 is arranged on the outer ring of the exciter wheel pair 1, the probe points to the outer circumferential surface of the exciter wheel pair 1 along the radial direction, namely points to the adsorption type bolt hole marks 4 along the radial direction, wherein the eddy current sensor 3 is independently arranged and fixed, and the adsorption type bolt hole marks 4 have a certain radial height. In this embodiment, the adjusting bolt hole sites 11 on the end face of the exciter pair wheel 1 are numbered from zero, and the adsorption bolt hole marks 4 are attached to each adjusting bolt hole site 11, when the eddy current sensor 3 approaches the adsorption bolt hole marks 4 in the rotating process of the exciter pair wheel 1, the electric signal of the eddy current sensor 3 changes along with the height change, when the exciter rotor 5 rotates by a certain angle, the eddy current sensor 3 is triggered once, that is, one adsorption bolt hole mark 4 is sensed, and at the moment, the data acquisition analysis module receives the signal that the exciter rotor 5 rotates by a certain angle. In this embodiment, the zero bolt hole site is taken as a starting position, taking 22 bolt hole sites as an example, in the rotating process of the exciter pair wheel 1, each time the electric vortex sensor 3 senses one adsorption type bolt hole mark 4, a signal is automatically collected, when the electric vortex sensor 3 senses the first adsorption type bolt hole mark 4, the collected angle is 360/22, when the electric vortex sensor 3 senses the second adsorption type bolt hole mark 4, the collected angle is 360 x 2/22, and so on.

In this embodiment, the jigger module is mounted on the generator rotor 8. The jigger module is provided with an external meshing gear which is meshed with a gear on the periphery of the rotor of the steam turbine generator, when the jigger module rotates, the external meshing gear rotates to further drive the rotor of the steam turbine generator comprising the exciter rotor to rotate, and when the jigger module stops rotating, the jigger module is realized through the meshing relationship among the gears. In addition, the jigger module has overload protection, torque display, rotation speed selection, overload alarm and linkage functions with the angle measurement sensor, is small in size and can be installed in a closed bearing box for use.

The rotating speed range of the jigger module is selectable at (0.5-2) revolutions per minute, and it is required to be noted that the jigger module can preset the jigger rotating speed through the terminal module in the running process so as to ensure constant rotating speed in the jigger process, and meanwhile, when the jigger module has torque mutation in the jigger process, the overload protection function is started, and the jigger module can automatically stop jigger and alarm. The application of the jigger module replaces the traditional manual jigger mode, and reduces the labor cost in the process of adjusting the swing degree of the exciter rotor. Meanwhile, the device can be linked with other modules to realize automatic measurement data and fastening of bolts. In this embodiment, the bolt fastening module is an electric wrench or a hydraulic wrench, preferably an electric wrench, and the electric wrench is used as an example to set the electric wrench on the adjusting bolt on the end face of the excitation pair wheel, and after the electric wrench receives the execution instruction of the control module, the electric wrench adjusts the adjusting bolt according to the execution instruction to adjust the deflection of the excitation pair wheel, thereby changing the swing degree of the exciter rotor. The electric wrench is an electric wrench with multiple shafts, and the power supply mode is battery power supply or contact power supply through a slip ring mode, so that the winding condition can not occur during rotation. The application of the bolt fastening module replaces manual fastening of the adjusting bolt, and labor cost in the swing degree adjusting process of the exciter rotor 5 is saved.

As shown in fig. 5, in this embodiment, twenty-two adjusting bolt hole sites 11 are shared on the end face of the exciter pair wheel 1, correspondingly, twenty-two adsorption bolt hole marks 4 are required to be installed on the outer circle of the exciter pair wheel 1 corresponding to the adjusting bolt hole sites 11, twenty-two electric wrenches are required to be sleeved on the adjusting bolts, in addition, each electric wrench is provided with a front torque sensor, the torque sensor is used for collecting the torque of the bolt, and the torque sensor is in communication connection with the control module so as to feed back the torque value of the bolt to the control module, thereby forming closed-loop control.

In one embodiment, the exciter rotor swing adjustment system further comprises a display unit, wherein the display unit is connected with the data acquisition and analysis module and the control module and is used for displaying measured values received and/or generated by the data acquisition and analysis module and the control module, such as swing value, angle value, bolt moment and the like, so as to realize visualization of the swing adjustment process and provide visual reference for operators.

The practical application process of the exciter rotor swing adjustment system is described by taking a control module as an industrial personal computer as an example. The method comprises the following specific steps:

step one: the method comprises the steps of measuring initial deflection of the generator wheel set 2 through a first displacement sensor in a measuring module, measuring initial deflection of the exciter wheel set 1 through a second displacement sensor in the measuring module, calculating to obtain initial deflection of the excitation wheel set fastened together, calculating the swing degree according to the initial deflection, comparing the calculated swing degree with the first range, and carrying out grinding correction on the exciter wheel set 1 when the swing degree is not in the first range until the swing degree is in the first range.

Step two: the excitation wheel pair is fastened together through bolts, and a ladybug deviation qualified range, a swing degree qualified range, a target rotation angle and a jigger rotation speed are set in a data acquisition and analysis module through an industrial personal computer. Illustratively, the ladle deflection is in the range of 0mm to 0.02mm, and the swing is in the range of 0mm to 0.12mm.

During rotation of the generator rotor, it is possible to continuously rotate to continuously measure the degree of wobble at the journal of the exciter rotor 5. The target rotation angle is set for the rotation of the exciter rotor 5 to and stopping at the angle, and then the journal measurement value at the angle is obtained in a targeted manner, wherein the target rotation angle is related to the bolt hole position 11 of the end face of the exciter counter wheel 1, and the target rotation angle is the central angle corresponding to two adjacent bolts. The jigger rotating speed can be correspondingly set according to the actual condition of the site.

Step three: the eddy current sensor 3 is aligned with the zero adsorption type bolt hole mark 4, the angle is 0 degree at this moment, after alignment, the jigger module is started to drive the exciter rotor 5 to rotate, the rotation angle of the exciter rotor 5 is collected once when the eddy current sensor 3 passes through one adsorption type bolt hole mark 4, meanwhile, the third displacement sensor 6 is triggered to measure the radial measured value at the shaft neck of one exciter rotor 5, the exciter pair wheel 1 rotates one circle, and the data collection analysis module obtains the difference value between the maximum value and the minimum value in the radial measured values generated when the exciter rotor 5 rotates one circle (namely, the swing degree of the exciter rotor 5).

Step four: the data acquisition analysis module further judges whether the difference value between the maximum value and the minimum value accords with the swing degree qualification range. Specifically, two cases are: when the rotation stopping instruction is met, a swing degree qualified result is generated, the swing degree qualified result is transmitted to the control unit, the control unit displays indication information such as the swing degree qualified on the display unit, meanwhile, the control unit generates the rotation stopping instruction and sends the rotation stopping instruction to the jigger module to control the rotation stopping, and then the exciter stops rotating the wheel 1, and the swing degree adjustment of the exciter rotor is completed; when the two types of the excitation pair wheels are not matched, a yaw rate disqualification result is generated and transmitted to the control unit, the control unit displays information such as a yaw rate value and the like on the display unit, meanwhile, the comparison unit analyzes the collected radial measurement data at the shaft necks of all the excitation pair wheels 5 to generate a bolt adjustment scheme, the bolt adjustment scheme is transmitted to the control unit, the control unit displays the bolt adjustment scheme on the display unit, the control module generates an adjustment instruction according to the bolt adjustment scheme, and sends the adjustment instruction to the bolt fastening module to adjust fastening torque of each bolt on the end face of the excitation pair wheel 1 so as to adjust the buckling deflection of the excitation pair wheels, and then the yaw rate of the excitation pair wheels 5 is adjusted.

After the adjustment of the rotor swing of the exciter rotor is completed once, when the re-measured rotor swing of the exciter is still not satisfactory, the re-adjustment can be performed again by repeatedly executing the second step and the third step.

It is to be understood that the above examples only represent preferred embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention; it should be noted that, for a person skilled in the art, the above technical features can be freely combined, and several variations and modifications can be made without departing from the scope of the invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims (10)

1. The method for adjusting the swing degree of the exciter rotor is characterized by comprising the following steps of:

s1, connecting an exciter wheel set and a generator wheel set through bolts, applying initial moment to each bolt, installing a special support for the swing degree on the middle split surface of an exciter bearing seat, and installing a jigger device on a generator rotor;

s2, starting a jigger device, and measuring the swing degree of a shaft neck of an exciter rotor to be used as an actual swing degree;

s3, calculating the ladybug deviation of the excitation pair wheel according to the swing degree, and taking the ladybug deviation as an actual ladybug deviation;

s4, determining a ladle deflection correction amount according to the numerical value of the ladle deflection and the ladle deflection qualified range, and adjusting fastening moment of each bolt on the exciter pair wheel and the generator pair wheel according to the ladle deflection correction amount until the ladle deflection of the exciter pair wheel is reduced to the ladle deflection qualified range.

2. The exciter rotor yaw adjustment method according to claim 1, characterized in that in step S2 it comprises: and a third displacement sensor is arranged on the outer peripheral surface of the shaft neck of the exciter rotor, a radial measurement value of the shaft neck of the exciter rotor corresponding to each bolt hole position on the end surface of the exciter pair wheel is measured, and a difference value between the maximum value and the minimum value in the radial measurement value is obtained, wherein the difference value is the swing degree.

3. The method according to claim 1, further comprising, prior to step S1, S0, obtaining a slip of the exciter and generator pairs as an initial slip, calculating a yaw from the slip as an initial yaw; when the swing degree is not in the first range, firstly grinding and correcting the end face of the exciter pair wheel until the swing degree is in the first range; the first range is in the superposition range of the swing degree correction quantity corresponding to the swing degree qualified range and the laddering correction quantity.

4. A method of adjusting the wobble of an exciter rotor according to claim 3, wherein the ladybug correctable amount is the difference between the maximum torque allowed to be applied to the bolts on the excitation pair wheel and the minimum torque corresponding to the axial compression.

5. A method of adjusting the rotor throw of an exciter according to claim 1 or 3, wherein in step S3, the offset is determined according to the calculation of equation five, which is:

wherein JK is the wobble, CD is the axial length of the exciter rotor, FG is the offset of the exciter pair wheel, and EF is the diameter length of the exciter pair wheel.

6. The method of claim 4, wherein the relationship between the pivotable amount of the ladle and the torque of the bolt is determined by a calculation process of a fourth formula, the calculation process of the fourth formula being:

delta L is the axial compression quantity of the exciter to the wheel, and the unit is m; f is the pretightening force of the bolt, and the unit is N; l is the initial axial thickness of the compressed position of the exciter pair wheel, and the unit is m; e is the elastic modulus of the exciter pair wheel, and the unit is pa; a is the contact area of the matching surface of the generator wheel 2 and the exciter wheel, and the unit is m ² The method comprises the steps of carrying out a first treatment on the surface of the n is the number of bolts on the end face of the exciter wheel pair; t is the torque of the bolt, and the unit is Nm; m is the tightening torque coefficient of the bolt; d is the nominal diameter of the bolt, and the unit is m; d, d ₁ The unit is m for the outer diameter of the contact surface of the exciter wheel and the generator wheel; d, d ₂ The unit is m for the inner diameter of the contact surface of the exciter wheel and the generator wheel.

7. An exciter rotor yaw adjustment system, comprising:

the jigger module is arranged on the generator rotor and used for controlling the generator rotor to rotate and driving the exciter rotor to rotate;

the bolt fastening module is used for adjusting the moment of each bolt on the excitation pair wheel;

a measurement module for measuring the degree of throw at the exciter rotor journal;

the data acquisition and analysis module is provided with a deflection allowable range and a deflection qualified range, and is used for receiving the deflection of the exciter rotor, comparing the received deflection of the exciter rotor, generating a comparison result, and generating a bolt moment adjustment scheme according to the comparison result;

and the control module is in communication connection with the data acquisition and analysis module and is used for controlling the bolt fastening module to adjust the moment on the bolt according to the bolt moment adjustment scheme.

8. The exciter rotor balance adjustment system of claim 7, wherein the measurement module comprises:

the third displacement sensor is arranged at the shaft neck of the exciter rotor and is in communication connection with the data acquisition and analysis module and is used for measuring the swing degree of the exciter rotor; and

and the angle measuring unit is used for measuring the rotation angle of the rotor and is in communication connection with the data acquisition and analysis module.

9. The exciter rotor balance adjustment system of claim 8, wherein the third displacement sensor is a wireless dial indicator;

the angle measuring unit comprises an adsorption type spiral hole position mark adsorbed on the periphery of the exciter pair wheel and an eddy current sensor which is arranged on the outer ring of the exciter pair wheel and points to the adsorption type spiral hole position mark.

10. The exciter rotor yaw adjustment system of claim 7, wherein an external meshing gear is provided on the jigger module, the external meshing gear meshing with a gear on a generator rotor to drive the generator rotor to rotate;

the bolt fastening module comprises electric wrenches sleeved on end face bolts of the exciter rotor pair wheels, and each bolt is sleeved with one electric wrench.