CN110186350B - Shafting centering detection and shafting assembly method for diesel generator set - Google Patents
Shafting centering detection and shafting assembly method for diesel generator set Download PDFInfo
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- CN110186350B CN110186350B CN201910499884.2A CN201910499884A CN110186350B CN 110186350 B CN110186350 B CN 110186350B CN 201910499884 A CN201910499884 A CN 201910499884A CN 110186350 B CN110186350 B CN 110186350B
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- crankshaft
- rotor
- diesel engine
- main generator
- shafting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
- F02B63/04—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for electric generators
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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
- G01B5/0025—Measuring of vehicle parts
Abstract
The invention discloses a shafting centering detection method and an assembly method of a diesel generating set, comprising the following steps: connecting a crankshaft of the diesel engine and a rotor of a main generator through an elastic diaphragm coupling; pushing a crankshaft of the diesel engine to the free end side of the diesel engine to be positioned, and simultaneously pushing a rotor of a main generator to the free end side of the diesel engine; and rotating the crankshaft of the diesel engine in a rotating mode until the crankshaft of the diesel engine and the rotor of the generator do not move any more, measuring the axial displacement of the crankshaft of the diesel engine and the rotor of the main generator, and determining the position of a shafting according to the axial displacement of the crankshaft and the rotor of the main generator. According to the structural characteristics of the diesel generating set, the shaft centering detection method provided by the invention can accurately detect whether the generator set shaft is positioned in the middle of the positioning bearing by means of the elastic force of the elastic diaphragm coupling for recovering deformation and the thrust limit function of the positioning bearing, so that failure faults such as bearing abrasion and the like are effectively avoided.
Description
Technical Field
The invention relates to the technical field of diesel generator set production, in particular to a method for centering detection and assembling a shaft system of a diesel generator set.
Background
In the process of assembling the diesel generating set, the position relation between the main generator and the diesel engine needs to be adjusted, so that the stator and the rotor of the main generator are installed with the diesel engine in a matching mode. During the normal operation of the locomotive, when the locomotive is started and stopped, parts on the locomotive can generate impact force due to inertia, particularly a diesel generator set shafting, and the shafting is in a suspension state during the working process, so that axial impact is easy to generate. Therefore, diesel engine crankshafts are usually designed with positioning thrust bearings, as are main generators. When the diesel engine is matched and assembled with the main generator, the relative position relation between a shafting rotor and a stator of the unit needs to be adjusted, if the position relation is improper, the shafting is adjusted too long or too short, the abrasion to the diesel engine and a positioning bearing of the main generator is easily caused, and the unit application fault is caused.
As shown in fig. 1, in order to solve the above problems, a diesel generator set includes a flywheel housing 4, a crankshaft 2, a crankshaft positioning bearing 1, a flywheel 3, a main generator stator 5, an elastic diaphragm coupling 6, an adjusting shim 7, a main generator rotor 8, and a rotor positioning bearing 9, when the diesel generator set is assembled, a mounting end face distance X between the flywheel housing 4 and the flywheel 3 of the diesel engine, a mounting end face distance Y between the stator 5 and the elastic diaphragm coupling 6 of the main generator, and a thickness t of the adjusting shim 7 of a shaft system are calculated, so that the shaft system of the set and the stator 5 can be better installed in a matching manner. However, in the actual assembling and measuring process, the thickness t of the adjusting shim is difficult to accurately measure and calculate, the actual length of the shafting and the position of the positioning bearing where the shafting is located are uncertain, and if the shafting is likely to lean against the side a or the side b of the positioning bearing after assembling, when the unit works, the shafting rotates at a high speed, so that the bearing is easily abraded, the bearing vibration is increased, the bearing abrasion is aggravated, the bearing vibration is further increased, and a vicious circle is formed.
Meanwhile, the clearance between the diesel engine and the positioning bearing of the main generator is small, and is generally about 0.5 mm. In the prior art, in the actual operation process, the distance (X \ Y) between the stator and the rotor is measured by using a depth gauge, and the thickness t of the adjusting gasket can be accurately measured and calculated by adding the error of the dimensional accuracy of a component. After the diesel generating set is assembled, the shafting can not be ensured to be positioned in the middle of the positioning bearing. In the prior art, due to the problem of measurement accuracy, there is no effective checking method to confirm that the shafting is in the middle position of the bearing after the assembly of the unit.
Disclosure of Invention
In view of the above, the present invention provides a method for detecting a centered shafting of a diesel generator set and a method for assembling a shafting of a diesel generator set, which can solve the technical problems of low measurement accuracy and no effective inspection method in the prior art.
Based on the above purpose, an aspect of the embodiments of the present invention provides a method for detecting a shafting centering of a diesel generator set, including:
firstly, connecting a crankshaft of a diesel engine and a rotor of a generator through an elastic diaphragm coupling;
step two, pushing a crankshaft of the diesel engine to be positioned at the free end side of the diesel engine or the non-transmission end side of the motor, and pushing a rotor of a main generator to the same direction;
and step three, rotating the crankshaft of the diesel engine in a circling manner until the crankshaft of the diesel engine and the rotor of the generator do not move axially any more, measuring the axial displacement of the crankshaft of the diesel engine and the rotor of the main generator, and determining the position of a shafting according to the axial displacement of the crankshaft and the rotor of the main generator.
Further, determining the shafting position according to the axial displacement of the crankshaft and the main generator rotor comprises:
when the diesel engine crankshaft and the main generator rotor are pushed to the positioning direction to the non-transmission end of the motor of the diesel generator set, the diesel engine crankshaft rotates in a coiling manner, and the diesel engine crankshaft does not move axially:
when in use
When the engine is started, the crankshaft of the diesel engine is positioned in the middle of the crankshaft positioning bearing, and the rotor of the main generator is positioned in the middle of the rotor positioning bearing;
wherein C is the displacement of the rotor,
n is the play of the positioning bearing of the generator,
m is crankshaft positioning bearing play.
Further, when
When the main generator rotor is positioned at the position of the rotor positioning bearing, which is far away from the crankshaft;
when in use
When the temperature of the water is higher than the set temperature,the main generator rotor is positioned on the position of the rotor positioning bearing close to the crankshaft;
when C is equal to N, the rotor of the main generator is positioned at the stop positioning position of the rotor positioning bearing close to one side of the crankshaft;
when the crankshaft of the diesel engine moves axially and only moves towards the free end of the diesel engine,
and C is 0, and the main generator rotor is positioned at the stop positioning part of the rotor positioning bearing on the side far away from the crankshaft.
Further, still include:
and step four, calculating the adjustment quantity of the gasket according to the displacement quantity of the rotor.
Further, calculating the adjustment amount of the shim includes:
when in use
When, the thickness of the gasket is reduced to
When in use
While increasing the thickness of the gasket to
When C is equal to N, at least the thickness of the gasket is increased
When C is 0, the crankshaft is pushed to move in the direction away from the rotor positioning bearing, the crankshaft displacement of the crankshaft is measured, and the thickness of the gasket is reduced to
Wherein C is the displacement of the rotor,
d is the displacement of the crankshaft,
n is the play of the positioning bearing of the generator,
m is crankshaft positioning bearing play.
Further, the rotor displacement is measured by a rotor dial indicator; the crankshaft displacement is measured by a crankshaft dial indicator.
Further, a pointer of the rotor dial indicator abuts against the end face, far away from the crankshaft, of the rotor; and the pointer of the crankshaft dial indicator is propped against the end face, far away from the rotor, of the crankshaft.
Further, the rotor dial indicator is fixed on a shell of which the non-transmission end of the main generator is close to the end face of the rotor; the crankshaft dial indicator is fixed on the shell of the free end of the diesel engine close to the end face of the crankshaft.
Further, the method also comprises the step of connecting the flywheel shell of the diesel engine with the stator of the main generator.
On the other hand, the embodiment of the invention also discloses a diesel generator set assembling method, which adopts the diesel generator set shafting centering detection method to carry out shafting centering detection.
The invention has the following beneficial technical effects:
according to the structural characteristics of the diesel generating set, the shaft centering detection method provided by the invention can accurately detect whether the generator set shaft is positioned in the middle of the positioning bearing by means of the elastic force of the elastic diaphragm coupling for recovering deformation and the thrust limit function of the positioning bearing, so that failure faults such as bearing abrasion and the like are effectively avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a prior art diesel generator set assembly configuration diagram;
FIG. 2 is a schematic diagram of a detection structure of the diesel generator set.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention are described in further detail with reference to the accompanying drawings.
It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it should be noted that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and they are not described in any more detail in the following embodiments.
As shown in fig. 2, the embodiment of the invention discloses a method for detecting the shafting centering of a diesel generator set, wherein a system for detecting the diesel generator set comprises a flywheel housing 4, a crankshaft 2, a crankshaft positioning bearing 1, a flywheel 3, a main generator stator 5, an elastic diaphragm coupler 6, an adjusting gasket 7, a main generator rotor 8, a rotor positioning bearing 9, a dial indicator a10 and a dial indicator B11, wherein the dial indicators a and B are respectively arranged at two ends of the whole diesel generator set and are respectively used for measuring the displacement of the crankshaft and the displacement of the rotor.
The method comprises the following steps:
firstly, connecting a crankshaft of a diesel engine and a rotor of a generator through an elastic diaphragm coupling;
secondly, pushing a crankshaft of the diesel engine to a position towards the free end of the diesel engine, and simultaneously moving a rotor of the main generator to one side of the free end of the diesel engine;
and step three, rotating the crankshaft of the diesel engine in a rotating mode until the crankshaft of the diesel engine and the rotor of the generator do not move axially any more, measuring the axial displacement of the crankshaft of the diesel engine and the rotor of the main generator, and determining the position of a shafting according to the axial displacement of the crankshaft and the rotor of the main generator.
The embodiment is based on the elastic diaphragm coupling of diesel generator group axle frenulum, and diesel engine and main generator all have the location bearing, and the unit shafting is not infinitely movable in the axial. According to the structural characteristics of the diesel generating set, whether the set shafting is located in the middle of the positioning bearing or not is determined through detection and adjustment by means of the elastic force of the elastic diaphragm coupling for recovering deformation and the thrust limiting function of the positioning bearing, and failure faults such as bearing abrasion and the like are effectively avoided.
In some embodiments of the present invention, on the basis of the above embodiments, determining the shafting position according to the rotor displacement includes:
when the diesel engine crankshaft and the main generator rotor are pushed to the B end (shown in the figure) of the diesel generator set to be positioned, the diesel engine crankshaft rotates in a disc-moving mode, and under the condition that the diesel engine crankshaft does not move axially:
when in use
When the engine is started, the crankshaft of the diesel engine is positioned in the middle of the crankshaft positioning bearing, and the rotor of the main generator is positioned in the middle of the rotor positioning bearing;
wherein C is the displacement of the rotor,
n is the play of the positioning bearing of the generator,
m is crankshaft positioning bearing play.
When in use
When the main generator rotor is positioned at the position of the rotor positioning bearing, which is far away from the crankshaft;
when in use
When the rotor of the main generator is positioned at the position of the rotor positioning bearing, which is close to the crankshaft;
when C is equal to N, the rotor of the main generator is positioned at the stop positioning position of the rotor positioning bearing close to one side of the crankshaft;
when the crankshaft of the diesel engine moves axially and only moves towards the free end of the diesel engine,
and C is 0, and the main generator rotor is positioned at the stop positioning part of the rotor positioning bearing on the side far away from the crankshaft.
After shafting centering detection is carried out, if the shafting position is in a centered state, the shafting needs to be adjusted according to detection, so that the shafting is centered.
Specifically, calculating the adjustment amount of the shim includes:
when in use
When, the thickness of the gasket is reduced to
When in use
While increasing the thickness of the gasket to
When C is equal to N, at least the thickness of the gasket is increased
When C is 0, the crankshaft is pushed to move in the direction away from the rotor positioning bearing, the crankshaft displacement of the crankshaft is measured, and the thickness of the gasket is reduced to
Wherein C is the displacement of the rotor,
d is the displacement of the crankshaft,
n is the play of the positioning bearing of the generator,
m is crankshaft positioning bearing play.
In some embodiments of the invention, a flywheel housing of the diesel engine is required to be connected with a stator of the main generator during detection, and a pointer of the rotor dial indicator is propped against the end face of the non-transmission end of the rotor; and the pointer of the crankshaft dial indicator is propped against the end face of the crankshaft, which is positioned at the free end of the diesel engine. Preferably, the rotor dial indicator is fixed on a shell of which the non-transmission end of the main generator is close to the end face of the rotor; the crankshaft dial indicator is fixed on the shell of the free end of the diesel engine close to the end face of the crankshaft.
The centering detection method is adopted to carry out shafting centering detection and adjustment, and the assembled diesel generating set shafting can ensure the relative position relationship between the rotor and the stator of the shafting of the diesel generating set to the maximum extent due to the accuracy of the detection result, thereby avoiding the abrasion and the operation fault of the positioning bearings of the diesel engine and the main generator caused by the improper position relationship between the rotor and the stator of the shafting of the diesel generating set.
Example 1
As shown in fig. 2, the clearance of the crankshaft positioning bearing 1 of the diesel engine is M, and the clearance of the rotor positioning bearing 9 of the main generator is N, N > M. The diesel engine flywheel shell 4 is connected with a main generator stator 5, the crankshaft 2 is connected with a main generator rotor 8 through an elastic diaphragm coupler 6, and the length of a shaft system is adjusted through adjusting the thickness of a gasket 7. The main generator rotor also rotates with it as the diesel engine crankshaft is rotated in a cranking manner. Two dial indicators A10 and B11 are respectively adsorbed on the shells of the end A and the end B of the diesel generator set, and the pointers of the dial indicators are respectively propped against the end face of the crankshaft of the diesel engine and the end face of the main engine rotor. Meanwhile, the crankshaft of the diesel engine and the rotor of the main generator are pushed to the side a or the side b of the positioning bearing, at the moment, the elastic diaphragm coupling is likely to be slightly deformed, but the elastic force for recovering the deformation is small, and the elastic diaphragm coupling is not enough to resist the friction force of shafting movement. When the crankshaft of the diesel engine rotates in a coiling mode, the crankshaft drives the main generator rotor to rotate, the friction force of the whole shafting is reduced, the shafting can move under the action of elastic force generated by restoring deformation of the elastic diaphragm coupler, the reading of the dial indicator is read at the moment, and the shafting is judged to be located at the position of the positioning bearing according to the reading.
Specifically, during detection, firstly, a crankshaft of the diesel engine and a rotor of the main generator are pushed to a side B of the positioning bearing at the same time, pointers of the dial indicator A and the dial indicator B are respectively zeroed, a rotating shaft system is turned, and a shaft system can axially move along with rotation. Because the locating bearing clearance N > M, so when dial indicator A reading is "0", the diesel engine bent axle is at locating bearing B side backstop location, and the diesel engine bent axle draws main generator rotor to A end through the elastic diaphragm shaft coupling that warp, and dial indicator B pointer anticlockwise rotation, and dial indicator B reading is C. And analyzing and judging the position of the shafting in the positioning bearing through the following data, and summarizing a calculation formula for adjusting the thickness t of the gasket:
when in use
When the engine is started, the crankshaft of the diesel engine and the rotor of the main generator are respectively positioned in the middle of the positioning bearing;
when in use
When the main generator rotor does not move to the middle position of the positioning bearing, the adjustment gasket is increased, the adjustment gasket is reduced, and the thickness is reduced
When in use
When the main generator rotor moves past the middle position of the positioning bearing, the adjustment gasket is reduced, and the thickness of the adjustment gasket is increased to
When C is equal to N, the rotor of the main generator moves to the side limit position of the positioning bearing a, the adjusting shim is decreased, and the thickness of the adjusting shim is increased at least
When the shaft system is turned and rotated, the reading of the dial indicator B is 0, which indicates that the shaft system of the unit is too long, the rotor of the main generator stops and is positioned at the side of the positioning bearing B, the elastic diaphragm coupling recovers the deformation elasticity to push the crankshaft of the diesel engine to move towards the end A of the unit, and the pointer of the dial indicator A rotates clockwise, and the reading is D. The phenomenon shows that the shafting of the diesel generating set is too long, the thickness of the adjusting shim is subtracted, and the thickness is
Where D is the dial gauge A reading.
In conclusion, the method for detecting the centering of the diesel generating set shafting can detect the position of the shafting in the positioning bearing, calculate the thickness of the shafting adjusting gasket according to the detection data, adjust the shafting length, enable the shafting to be in the reasonable position of the positioning bearing, avoid the shafting from being propped at the limit position of the positioning bearing, and avoid the bearing failure fault caused by the abrasion of the positioning bearing due to long-term operation. And analyzing and summarizing the calculation formulas of the gasket adding and the gasket subtracting according to different shafting movement results. In the actual operation process, the actual measurement result can be directly compared with various conditions of the calculation formula of the adjusting shim, the thickness of the adjusting shim can be calculated simply, conveniently, accurately and efficiently, the length of the shafting can be directly compared with the adjusting shafting, the adjusting shafting is located at the position of the positioning bearing, the length of the diesel generator set shafting can be adjusted timely and effectively, and the working efficiency is improved.
It should be particularly noted that, the components or steps in the above embodiments may be intersected, replaced, added, or deleted, and therefore, the diesel generator set shafting centering detection method and the assembly method thereof formed by these reasonable permutation, combination and transformation shall also belong to the scope of the present invention, and shall not limit the scope of the present invention to the above embodiments.
The above is an exemplary embodiment of the present disclosure, and the order of disclosure of the above embodiment of the present disclosure is only for description and does not represent the merits of the embodiment. It should be noted that the discussion of any embodiment above is exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, of embodiments of the invention is limited to those examples, and that various changes and modifications may be made without departing from the scope, as defined in the claims. The functions, steps and/or actions of the method claims in accordance with the disclosed embodiments described herein need not be performed in any particular order. Furthermore, although elements of the disclosed embodiments of the invention may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, of embodiments of the invention is limited to these examples; within the idea of an embodiment of the invention, also technical features in the above embodiment or in different embodiments may be combined and there are many other variations of the different aspects of an embodiment of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of the embodiments of the present invention are intended to be included within the scope of the embodiments of the present invention.
Claims (9)
1. A diesel generating set shafting centering detection method is characterized by comprising the following steps:
firstly, connecting a crankshaft of a diesel engine and a rotor of a main generator through an elastic diaphragm coupler;
secondly, pushing a crankshaft of the diesel engine to a fixed position to the free end side of the diesel engine or the non-transmission end side of the motor, and simultaneously pushing a rotor of the main generator to the same direction;
step three, rotating the crankshaft of the diesel engine in a circling manner until the crankshaft of the diesel engine and the rotor of the generator do not move axially any more, measuring the axial displacement of the crankshaft of the diesel engine and the rotor of the main generator, and determining the position of a shafting according to the axial displacement of the crankshaft and the rotor of the main generator;
determining the shafting position according to the axial displacement of the crankshaft and the main generator rotor comprises:
when the non-transmission end direction of a motor of the diesel generating set pushes the diesel engine crankshaft and the main generator rotor to be positioned, the diesel engine crankshaft rotates in a coiling manner, and the diesel engine crankshaft does not move axially:
when in use
When the engine is started, the crankshaft of the diesel engine is positioned in the middle of the crankshaft positioning bearing, and the rotor of the main generator is positioned in the middle of the rotor positioning bearing;
wherein C is the displacement of the rotor,
n is the play of the positioning bearing of the generator,
m is crankshaft positioning bearing play.
2. The method of claim 1,
when in use
When the main generator rotor is positioned at the position of the rotor positioning bearing, which is far away from the crankshaft;
when in use
When the rotor of the main generator is positioned at the position of the rotor positioning bearing, which is close to the crankshaft;
when C is equal to N, the rotor of the main generator is positioned at the stop positioning position of the rotor positioning bearing close to one side of the crankshaft;
when the crankshaft of the diesel engine moves in the axial direction and can only move towards the free end of the diesel engine, C is 0, and the rotor of the main generator is located at the stop positioning position of the rotor positioning bearing, which is far away from one side of the crankshaft.
3. The method of claim 1, further comprising:
and step four, calculating the adjustment quantity of the gasket according to the rotor displacement.
4. The method of claim 3, wherein calculating the adjustment amount for the shim comprises:
when in use
When, the thickness of the gasket is reduced to
When in use
While increasing the thickness of the gasket to
When C is equal to N, at least the thickness of the gasket is increased
When C is 0, the crankshaft is pushed to move in the direction away from the rotor positioning bearing, the crankshaft displacement of the crankshaft is measured, and the thickness of the gasket is reduced to
Wherein C is the displacement of the rotor,
d is the displacement of the crankshaft,
n is the play of the positioning bearing of the generator,
m is crankshaft positioning bearing play.
5. The method of claim 4, wherein the amount of axial displacement of the rotor is measured by a rotor dial gauge; the axial displacement of the crankshaft is measured by a crankshaft dial indicator.
6. The method of claim 5, wherein the pointer of the rotor dial indicator abuts against an end face of the non-driving end of the rotor; and the pointer of the crankshaft dial indicator is propped against the end face of the crankshaft, which is positioned at the free end of the diesel engine.
7. The method of claim 6, wherein the rotor dial indicator is secured to the housing at a non-driving end of the main generator proximate an end face of the rotor; the crankshaft dial indicator is fixed on the shell of the free end of the diesel engine close to the end face of the crankshaft.
8. The method of claim 1, further comprising coupling the diesel flywheel housing to the primary generator stator.
9. A diesel generating set shafting assembly method is characterized in that shafting centering detection is carried out by adopting the diesel generating set shafting centering detection method of any one of claims 1 to 8.
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| CN201910499884.2A CN110186350B (en) | 2019-06-11 | 2019-06-11 | Shafting centering detection and shafting assembly method for diesel generator set |
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