CN113390314A - Centering method for large axial flow fan double coupler of power plant - Google Patents
Centering method for large axial flow fan double coupler of power plant Download PDFInfo
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- CN113390314A CN113390314A CN202110652422.7A CN202110652422A CN113390314A CN 113390314 A CN113390314 A CN 113390314A CN 202110652422 A CN202110652422 A CN 202110652422A CN 113390314 A CN113390314 A CN 113390314A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000010168 coupling process Methods 0.000 claims abstract description 42
- 238000005859 coupling reaction Methods 0.000 claims abstract description 42
- 230000008878 coupling Effects 0.000 claims abstract description 32
- 238000004364 calculation method Methods 0.000 claims description 44
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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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
Abstract
The invention discloses a centering method for a double-coupling device of a large axial flow fan in a power plant, wherein a left coupling device and a right coupling device are respectively arranged at two ends of the double-coupling device, the right coupling device is connected with one end of a motor, and the left coupling device is connected with one end of a fan, and the centering method comprises the following steps: 1. checking and eliminating factors affecting the alignment of the wheels; 2. respectively checking whether the bottom feet of the motor and the fan are flat and whether virtual angles exist or not; 3. using a ruler to perform preliminary alignment on one end of the left coupler and one end of the right coupler respectively; 4. respectively installing dial indicators on the left coupling and the right coupling; 5. slowly rotating the rotor, recording a set of measured data at intervals of 90 degrees, respectively calculating the deviation value of the motor end and the fan end through the recorded data, and adjusting the motor through the adjusting value. The invention aims to provide a double-coupling centering method which is simple to operate, low in workload and high in accuracy.
Description
Technical Field
The invention relates to the technical field of shaft coupling pair wheel alignment, in particular to a method for centering a double-shaft coupler of a large axial flow fan in a power plant.
Background
The shaft coupling centering is an important work for overhauling auxiliary equipment such as a pump and a fan, and if the center of the rotating equipment is not accurately found, the abnormal vibration of machinery is inevitably caused, so that the centering work of the center of the rotating mechanical equipment is required to be carried out in each overhauling, and the center deviation of two shafts does not exceed a specified value; however, the existing alignment method is complex in operation, large in calculation amount, large in workload and poor in alignment accuracy.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the double-coupling centering method which is simple to operate, low in workload and high in accuracy.
The technical scheme adopted by the invention for realizing the purpose is as follows: a centering method for a double-coupling device of a large axial flow fan in a power plant is characterized in that a left coupling device and a right coupling device are respectively arranged at two ends of the double-coupling device, the right coupling device is connected with one end of a motor, the left coupling device is connected with one end of a fan, and the centering method for the two ends of the double-coupling device at one end of the motor and one end of the fan respectively comprises the following steps:
checking and eliminating factors influencing aligning of the wheel pair;
step two, respectively checking whether the bottom feet of the motor and the fan are flat or not and whether virtual angles exist or not, if the virtual angles exist, measuring a numerical value through a feeler gauge, and then compacting through a copper sheet;
thirdly, using a ruler to perform preliminary alignment on one end of the left coupler and one end of the right coupler respectively;
step four, two groups of magnetic meter seats are respectively arranged on the inner sides of the left coupler and the right coupler, each magnetic meter seat is connected with a dial indicator through a measuring rod, the measuring rod of the first dial indicator is vertically arranged on the outer circumference of a coupling at one end of the motor or the fan, the measuring rod of the second dial indicator is horizontally arranged on one side of the outer end of the motor or the fan, after the installation is finished, the dial indicator rotates for a circle, and after the dial indicator returns to the original position, the pointer in the dial indicator is adjusted to zero;
step five, slowly rotating the rotor, recording a set of measured data every 90 degrees, recording radial data of four positions, namely, the upper position, the lower position, the left position and the right position, measured by the right coupling, as C1, C2, C3 and C4, recording axial data as D1, D2, D3 and D4, recording radial data of four positions, namely, the upper position, the lower position, the left position and the right position, measured by the left coupling, as C1, C2, C3 and C4, recording axial data as D1, D2, D3 and D4, returning to the original position after the rotor rotates for a circle, wherein the indicated value in the dial indicator is zero at the moment, otherwise, rechecking whether the magnetic gauge seat and the dial indicator are firm, and then re-measuring and recording the data;
and step six, respectively calculating deviation values of the motor end and the fan end through the data recorded in the step five, respectively calculating adjustment values of the motor and the front support and the rear support of the fan through the deviation values, and adjusting the motor through the adjustment values.
In the first step, factors influencing the adjustment of the pair of wheels include oil stains, rusty spots and motor feet on the wheels.
The calculation method in the sixth step is as follows:
a. the calculation formula of the vertical deviation of the fan side is as follows: a ═ C1+ D1)/2- (C3+ D3)/2;
b. the calculation formula of the upper and lower deviations of the motor side is as follows: b ═ c1+ d1)/2- (c3+ d 3)/2;
c. according to a traditional coupler alignment formula:
the calculation formula of the end surface non-parallel value is that the upper opening and the lower opening are calculated as follows: a, a is 1-a3, and the calculation result is positive, the mouth is opened upwards, and negative is the mouth is opened downwards; the left and right openings are calculated as: a is 2-a4, and if the calculation result is positive, the mouth opening is carried out at a2 side, and the mouth opening is carried out at a4 side;
the calculation formula of the upper and lower radial deviation is b ═ b1-b3)/2, and the calculation result is positive number, the motor is higher, and the negative number is lower; the left and right radial deviation calculation formula is b ═ b2-b4)/2, if the calculation result is positive, the motor is deviated to the right, and if the calculation result is negative, the motor is deviated to the left;
thus, the center adjustment is calculated as
H1＝(b1-b3)×L1/D+(a1-a3)/2，
H2＝(b1-b3)×(L1+L2)/D+(a1-a3)/2，
Wherein: h1 is the pad that should be added after the front support calculation, H2 is the pad that should be added after the rear support calculation, L1 is the distance from the center of the coupler to the front foot, (L1+ L2) the distance from the center of the coupler to the rear foot, D is the coupler diameter, a: radial deviation, b: axial deviation;
to obtain: (1) the front support of the motor is adjusted to b x L1/D + (a1-a3)/2,
(2) the back support of the motor is adjusted by b x (L1+ L2)/D + (a1-a3)/2,
d. b × L2/D can be obtained from (2) - (1), and it can be seen that the adjustment of the axial deviation is only related to the distance between the front and rear supports;
e. adjusting the axial deviation A of the fan side, and obtaining A x L1/D according to a formula, namely moving the motor side connecting shaft coupling upwards A x L1/D, so that the vertical deviation of the motor and the connecting shaft coupling is A x L1/D of the motor, and the axial downward deviation is B x-A;
f. adjusting the center deviation of the motor and the middle shaft, and obtaining according to a formula:
the motor front support L2X (B-A)/D + A X L1/D,
the motor rear support (L2+ L3) × (B × a)/D + a × L1/D.
The invention has the beneficial effects that: the coupler alignment method is simple to operate, the workload of workers can be reduced, the working efficiency is improved, and the alignment precision is high.
Drawings
FIG. 1 is a schematic view of the mounting structure of the present invention;
FIG. 2 is a schematic diagram of the radial and axial measurement data structure of the right coupling of the present invention;
FIG. 3 is a schematic view of the radial and axial measurement data structure of the left coupling of the present invention;
FIG. 4 is a schematic diagram of a conventional single-coupling radial and axial measurement data structure;
FIG. 5 is a schematic diagram illustrating a calculation of a calculated deflection of a flare of a conventional single coupling;
FIG. 6 is a schematic view of a fan side axial deviation adjustment calculation;
fig. 7 is a schematic diagram illustrating the calculation of the center deviation between the adjustment motor and the connecting shaft.
FIG. 8 is a schematic diagram of a calculation according to an embodiment.
In the figure: 1 left coupling, 2 right couplings, 3 magnetic gauge stand, 4 percentage table.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-7, a method for centering a double coupling of a large axial flow fan in a power plant includes the following steps:
checking and eliminating factors influencing aligning of the wheel pair;
step two, respectively checking whether the bottom feet of the motor and the fan are flat or not and whether virtual angles exist or not, if the virtual angles exist, measuring a numerical value through a feeler gauge, and then compacting through a copper sheet;
thirdly, using a ruler to perform preliminary alignment on one end of the left coupler 1 and one end of the right coupler 2 respectively;
step four, two groups of magnetic meter seats 3 are respectively arranged on the inner sides of the left coupler 1 and the right coupler 2, each magnetic meter seat 3 is connected with a dial indicator 4 through a measuring rod, the measuring rod of the first dial indicator 4 is vertically arranged on the outer circumference of a pair wheel at one end of a motor or a fan, the measuring rod of the second dial indicator 4 is horizontally arranged on one side of the outer end of the motor or the fan, the dial indicator is rotated for a circle after the installation is finished, and an indicator needle in the dial indicator 4 is adjusted to zero after the dial indicator returns to the original position;
step five, slowly rotating the rotor, recording a set of measured data every 90 degrees, recording radial data of four positions of the upper part, the lower part, the left part and the right part, which are measured by the right coupling 2, as C1, C2, C3 and C4, recording axial data as D1, D2, D3 and D4, wherein the data are recorded as shown in fig. 2, the radial data of the four positions of the upper part, the lower part, the left part and the right part, which are measured by the left coupling 1, are C1, C2, C3 and C4, the axial data are D1, D2, D3 and D4, the data are recorded as shown in fig. 3, returning to the original position after the rotor rotates for one circle, at the moment, the indicated value in the dial indicator 4 is zero, otherwise, rechecking whether the magnetic gauge 3 and the dial gauge 4 are firm, and then re-measuring and recording the data;
and step six, respectively calculating deviation values of the motor end and the fan end through the data recorded in the step five, respectively calculating adjustment values of the motor and the front support and the rear support of the fan through the deviation values, and adjusting the motor through the adjustment values.
In the first step, factors influencing the adjustment of the pair of wheels include oil stains, rusty spots and motor feet on the wheels.
The calculation method in the sixth step is as follows:
a. the calculation formula of the vertical deviation of the fan side is as follows: a ═ C1+ D1)/2- (C3+ D3)/2;
b. the calculation formula of the upper and lower deviations of the motor side is as follows: b ═ c1+ d1)/2- (c3+ d 3)/2;
c. according to a traditional coupler alignment formula:
referring to fig. 4 and 5, the calculation formula of the end surface non-parallel value is as follows: a, a is 1-a3, and the calculation result is positive, the mouth is opened upwards, and negative is the mouth is opened downwards; the left and right openings are calculated as: a is 2-a4, and if the calculation result is positive, the mouth opening is carried out at a2 side, and the mouth opening is carried out at a4 side;
the calculation formula of the upper and lower radial deviation is b ═ b1-b3)/2, and the calculation result is positive number, the motor is higher, and the negative number is lower; the left and right radial deviation calculation formula is b ═ b2-b4)/2, if the calculation result is positive, the motor is deviated to the right, and if the calculation result is negative, the motor is deviated to the left;
thus, the center adjustment is calculated as
H1＝(b1-b3)×L1/D+(a1-a3)/2，
H2＝(b1-b3)×(L1+L2)/D+(a1-a3)/2，
Wherein: h1 is the pad that should be added after the front support calculation, H2 is the pad that should be added after the rear support calculation, L1 is the distance from the center of the coupler to the front foot, (L1+ L2) the distance from the center of the coupler to the rear foot, D is the coupler diameter, a: radial deviation, b: axial deviation;
to obtain: (1) the front support of the motor is adjusted to a x L1/D-b/2,
(2) the back support of the motor is adjusted to a x (L1+ L2)/D-b/2,
d. from (2) - (1), a × L2/D can be obtained, and it can be seen that the adjustment of the axial deviation is only related to the distance between the front and rear supports;
e. referring to fig. 6 and 7, the axial deviation a at the fan side is adjusted, and a × L1/D is obtained according to a formula, that is, the motor side connecting shaft coupling moves up a × L1/D, so that the vertical deviation between the motor and the connecting shaft coupling is a × L1/D of the motor, and the axial deviation is B-a;
f. adjusting the center deviation of the motor and the middle shaft, and obtaining according to a formula:
motor front support-L2X (B X-A)/D + A X L1/D,
the motor rear support- (L2+ L3) × (B × a)/D + a × L1/D.
Referring to fig. 8, an embodiment employs: the downward opening of the fan side coupler is 23 threads, and the right opening is 5 threads; the upward opening of the motor side coupler is 7 wires, and the left opening is 14.5 wires;
and (3) calculating and adjusting:
adjusting axial deviation of a fan side coupler;
applying a formula to obtain: a L1/D-23 8000/400-460 silk
Therefore, the motor-side connecting shaft moves 460 wires downwards, and the axial lower deviation B-A is-7- (-23) is 16 wires;
adjusting the axial and radial deviations of the motor side coupler;
the formula is applied to obtain:
front support: -L2(B-a)/D + L1 a/D-440-16/400 + 460-442.4 filaments
And (3) rear support: - (L2+ L3) × (B-a)/D + L1 × a/D ═ 440+800) × (16/400 + 460) ═ 410.4 filaments
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (3)
1. The method for centering the double couplers of the large axial flow fan in the power plant is characterized in that a left coupler (1) and a right coupler (2) are respectively arranged at two ends of each double coupler, the right coupler (2) is connected with one end of a motor, the left coupler (1) is connected with one end of a fan, and the method for centering two ends of each double coupler at one end of the motor and one end of the fan comprises the following steps:
checking and eliminating factors influencing aligning of the wheel pair;
step two, respectively checking whether the bottom feet of the motor and the fan are flat or not and whether virtual angles exist or not, if the virtual angles exist, measuring a numerical value through a feeler gauge, and then compacting through a copper sheet;
thirdly, using a ruler to conduct preliminary alignment on one end of the left coupler (1) and one end of the right coupler (2) respectively;
step four, two groups of magnetic meter seats (3) are respectively arranged on the inner sides of the left coupler (1) and the right coupler (2), each magnetic meter seat (3) is connected with a dial indicator (4) through a measuring rod, the measuring rod of the first dial indicator (4) is vertically arranged on the outer circumference of a coupling at one end of a motor or a fan, the measuring rod of the second dial indicator (4) is horizontally arranged on one side of the outer end of the motor or the fan, after the installation is finished, the test is rotated for a circle, and after the test is returned to the original position, an indicator in the dial indicator (4) is adjusted to zero;
step five, slowly rotating the rotor, recording a set of measured data every 90 degrees, recording radial data of four positions of the upper position, the lower position, the left position and the right position, which are measured by the right coupling (2), as C1, C2, C3 and C4, axial data as D1, D2, D3 and D4, radial data of four positions of the upper position, the lower position, the left position and the right position, which are measured by the left coupling (1), as C1, C2, C3 and C4, axial data as D1, D2, D3 and D4, returning to the original position after the rotor rotates for one circle, wherein the indicated value in the dial indicator (4) is zero at the moment, otherwise, rechecking whether the magnetic gauge base (3) and the dial indicator (4) are firm, and then re-measuring and recording the data;
and step six, respectively calculating deviation values of the motor end and the fan end through the data recorded in the step five, respectively calculating adjustment values of the motor and the front support and the rear support of the fan through the deviation values, and adjusting the motor through the adjustment values.
2. The method for centering the double-coupling device of the large axial flow fan of the power plant according to claim 1, wherein the method comprises the following steps: in the first step, factors influencing the adjustment of the pair of wheels include oil stains, rusty spots and motor feet on the wheels.
3. The method for centering the double-coupling device of the large axial flow fan of the power plant according to claim 1, wherein the method comprises the following steps: the calculation method in the sixth step is as follows:
a. the calculation formula of the vertical deviation of the fan side is as follows: a ═ C1+ D1)/2- (C3+ D3)/2;
b. the calculation formula of the upper and lower deviations of the motor side is as follows: b ═ c1+ d1)/2- (c3+ d 3)/2;
c. according to a traditional coupler alignment formula:
the calculation formula of the end surface non-parallel value is that the upper opening and the lower opening are calculated as follows: a, a is 1-a3, and the calculation result is positive, the mouth is opened upwards, and negative is the mouth is opened downwards; the left and right openings are calculated as: a is 2-a4, and if the calculation result is positive, the mouth opening is carried out at a2 side, and the mouth opening is carried out at a4 side;
the calculation formula of the upper and lower radial deviation is b ═ b1-b3)/2, and the calculation result is positive number, the motor is higher, and the negative number is lower; the left and right radial deviation calculation formula is b ═ b2-b4)/2, if the calculation result is positive, the motor is deviated to the right, and if the calculation result is negative, the motor is deviated to the left;
thus, the center adjustment is calculated as
H1＝(b1-b3)×L1/D+(a1-a3)/2，
H2＝(b1-b3)×(L1+L2)/D+(a1-a3)/2，
Wherein: h1 is the pad that should be added after the front support calculation, H2 is the pad that should be added after the rear support calculation, L1 is the distance from the center of the coupler to the front foot, (L1+ L2) the distance from the center of the coupler to the rear foot, D is the coupler diameter, a: radial deviation, b: axial deviation;
to obtain: (1) the front support of the motor is adjusted to b x L1/D + (a1-a3)/2,
(2) the back support of the motor is adjusted by b x (L1+ L2)/D + (a1-a3)/2,
d. b × L2/D can be obtained from (2) - (1), and it can be seen that the adjustment of the axial deviation is only related to the distance between the front and rear supports;
e. adjusting the axial deviation A of the fan side, and obtaining A x L1/D according to a formula, namely moving the motor side connecting shaft coupling upwards A x L1/D, so that the vertical deviation of the motor and the connecting shaft coupling is A x L1/D of the motor, and the axial downward deviation is B x-A;
f. adjusting the center deviation of the motor and the middle shaft, and obtaining according to a formula:
the motor front support L2X (B-A)/D + A X L1/D,
the motor rear support (L2+ L3) × (B × a)/D + a × L1/D.
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Citations (5)
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| CN102312927A (en) * | 2010-06-30 | 2012-01-11 | 中国华冶科工集团有限公司 | Aligning method of concentricity of coupling |
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| CN107036512A (en) * | 2017-05-19 | 2017-08-11 | 国网天津市电力公司 | A kind of computational methods of shaft coupling alignment |
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| CN110472329A (en) * | 2019-08-14 | 2019-11-19 | 中国电建集团河南工程有限公司 | The aligning method of intermediate extension shaft shaft coupling |
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2021
- 2021-06-11 CN CN202110652422.7A patent/CN113390314A/en active Pending
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|---|---|---|---|---|
| CN102312927A (en) * | 2010-06-30 | 2012-01-11 | 中国华冶科工集团有限公司 | Aligning method of concentricity of coupling |
| CN105242635A (en) * | 2015-09-21 | 2016-01-13 | 山东电力建设第一工程公司 | Axial center alignment method for steam turbine |
| JP2018059897A (en) * | 2016-09-28 | 2018-04-12 | 株式会社東芝 | Rotor alignment measurement evaluation method and arithmetic device |
| CN107036512A (en) * | 2017-05-19 | 2017-08-11 | 国网天津市电力公司 | A kind of computational methods of shaft coupling alignment |
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Application publication date: 20210914 |