CN114543736A - Method for detecting assembly coaxiality of diesel generating set - Google Patents
Method for detecting assembly coaxiality of diesel generating set Download PDFInfo
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- CN114543736A CN114543736A CN202210106958.3A CN202210106958A CN114543736A CN 114543736 A CN114543736 A CN 114543736A CN 202210106958 A CN202210106958 A CN 202210106958A CN 114543736 A CN114543736 A CN 114543736A
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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
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/22—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes
- G01B21/24—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes for testing alignment of axes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
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Abstract
The invention discloses a method for detecting the assembly coaxiality of a diesel generator set, which comprises the steps of adjusting the position of a rotor connecting flange of a main generator to enable the rotor connecting flange to be concentric with the mounting end face of a shell of the main generator; and then measuring the distance between the mounting end surface of the shell of the main generator and the mounting end surface of the rotor connecting flange of the main generator at different positions in the circumferential direction, and calculating to obtain an inclined included angle between the mounting end surface of the rotor connecting flange and the mounting end surface of the shell based on the distance to serve as a coaxiality evaluation standard of the rotor connecting flange and the mounting surface of the shell of the main generator. The invention can align the center of the end face of the rotor connecting flange with the center of the end face of the main generator shell under the condition of not rotating the rotor of the main generator, and then measure the distance relationship between four points uniformly distributed on the end face of the rotor connecting flange and the four points of the end face of the corresponding main generator shell so as to judge the coaxiality of the rotor connecting flange and the installation surface of the main generator shell.
Description
Technical Field
The invention relates to the technical field of diesel generator set assembly, in particular to a method for detecting assembly coaxiality of a diesel generator set.
Background
When the single-bearing supporting main generator is matched and assembled with the diesel engine, a rotor of the main generator is connected with a flywheel of the diesel engine, a stator of the main generator is connected with a flywheel shell of the diesel engine, no adjusting and centering link exists in the assembling process, and the coaxiality of the whole unit is completely guaranteed by means of machining precision. For example, the coaxiality of the rotor and the stator of the main generator is ensured by depending on the machining precision of each component. Although the machining precision of each connecting part can meet the requirement, such as the coaxiality requirement, whether the coaxiality requirement can be met after each connecting part is connected and assembled cannot be determined.
As shown in fig. 1, the single-bearing supported main generator is supported by a bearing 6 at the end II, and is not supported by a bearing at the end I. The I end is connected with a diesel engine, a main generator shell is connected with a flywheel shell of the diesel engine, and a rotor connecting flange is connected with a flywheel of the diesel engine. The higher the contact ratio of the axis of the rotor connecting flange 2 and the axis of the main generator shell 1 is, the more favorable the adjustment and centering of the diesel generator set are, and the coaxiality of the set is effectively improved.
As shown in fig. 1, the main generator rotor mainly comprises a rotor shaft 5, a second connecting flange 4 and a first connecting flange (i.e., a rotor connecting flange 2), the second connecting flange is assembled on the rotor shaft through hot-assembly interference fit, and the first connecting flange and the second connecting flange are connected together through bolts 3. It is generally believed that by increasing the coaxiality requirement of each component, the coaxiality of the whole assembled rotor can also meet the requirement, namely the coincidence degree of the axis of the connecting flange of the diesel engine connecting component and the axis of the main generator shell can meet the requirement. However, each part actually has a certain machining tolerance, after assembly, the tolerance is accumulated and amplified, and the coincidence degree of an axis of the connecting flange and an axis of the main generator shell does not necessarily meet the requirement, and the situation as shown in fig. 2 may occur. Because the end I has no bearing support, as shown in fig. 3, the rotor of the main generator sinks to the bottom to contact with the shell and cannot rotate, the contact ratio of the axis of the connecting flange after assembly and the axis of the main generator shell cannot be detected by a traditional effective method, namely, the dial indicator is adsorbed on the rotor, the pointer of the dial indicator abuts against the mounting surface of the shell, and the coaxiality of the mounting surface of the connecting flange and the mounting surface of the shell is measured and detected after the rotor rotates for a circle.
At present, the coaxiality requirement of each component can only be ensured by improving the machining precision, but after each component is connected, whether the whole coaxiality can meet the requirement or not is uncertain due to the existence of accumulated machining tolerance. Meanwhile, due to the characteristic of single-bearing support of the main generator, the bottom of the I end of the rotor is in contact with the bottom of the shell of the main generator in a natural state, and the coaxiality of the rotor and the shell of the main generator is difficult to detect by using a traditional coaxiality detection method.
Based on this, the prior art still remains to be improved.
Disclosure of Invention
In order to solve the technical problem, the embodiment of the invention provides a method for detecting the assembly coaxiality of a diesel generating set, so as to solve the problems in the prior art.
The embodiment of the invention discloses a method for detecting the assembly coaxiality of a diesel generating set, which comprises the following steps:
adjusting the position of a rotor connecting flange of a main generator to enable the rotor connecting flange to be concentric with the mounting end face of a shell of the main generator;
and secondly, measuring the distance between the mounting end face of the shell of the main generator and the mounting end face of the rotor connecting flange of the main generator at different positions in the circumferential direction, calculating an inclined included angle between the mounting end face of the rotor connecting flange and the mounting end face of the shell based on the distance, and using the inclined included angle as a coaxiality evaluation standard of the rotor connecting flange and the mounting surface of the shell of the main generator.
Further, adjusting the position of the rotor connecting flange of the main generator comprises: and inserting the chock blocks into the gap between the rotor connecting flange and the shell of the main generator, and adjusting the insertion depth of the chock blocks, wherein the chock blocks are respectively arranged at the lower end and two sides of the rotor connecting flange.
Further, the chock has a small end for insertion between the connection flange outer wall and the main generator housing inner wall, and a large end disposed opposite the small end; the small end of the first contact surface and the small end of the second contact surface are small ends of the chock.
The chock comprises a first contact surface for abutting the outer wall of the rotor attachment flange, and a second contact surface for abutting the inner wall of the main generator housing, wherein,
the first contact surface comprises a concave first arc surface, the small end of the first contact surface is connected with the small end of the second contact surface, and a first distance is reserved between the large end of the first contact surface and the large end of the second contact surface.
Further, the first cambered surface is approximately in a fan shape, and the first contact surface further comprises a first plane formed by extending the large end of the first cambered surface.
Further, the connecting structure further comprises two side surfaces which are connected with two sides of the first contact surface and the second contact surface.
Further, a line between the large end and the small end of the first cambered surface and the second contact surface form a first included angle, and the first included angle is 20 +/-1 degrees.
Further, the curve of the first cambered surface recess is matched with the outer wall of the rotor connecting flange.
Further, the insertion depth of the three chock blocks positioned at the lower end and two sides of the connecting flange is adjusted, the width of the gap is measured at intervals of 90 degrees, four width values are obtained, and when the difference value of any two width values is smaller than 0.5mm, the rotor connecting flange is considered to be concentric with the shell installation end face of the main generator.
Further, the extension surfaces of the two side surfaces form a second included angle, and the second included angle is 98 degrees +/-3 degrees.
Further, the calculation formula of the inclined included angle is
Wherein theta is an inclined included angle, b is the distance between the mounting end face of the shell of the main generator and the mounting end face of the rotor connecting flange of the main generator, and D is the diameter of the rotor connecting flange;
when the inclination angle is not more than 0.3 degrees, the coaxiality of the rotor connecting flange and the mounting surface of the main generator shell meets the assembly requirement. By adopting the technical scheme, the invention at least has the following beneficial effects:
the invention provides a method for detecting the assembly coaxiality of a diesel generator set, which can align the center of the end face of a rotor connecting flange with the center of the end face of a main generator shell under the condition of not rotating a rotor of the main generator, then measure the distance relationship between four uniformly distributed points on the end face of the rotor connecting flange and the four corresponding points on the end face of the main generator shell so as to judge the coaxiality of the rotor connecting flange and the mounting surface of the main generator shell.
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, 2 and 3 are schematic structural views of a single-bearing supporting main generator in the prior art;
fig. 4 is a schematic view of a state of a chock and a rotor connecting flange when detecting the assembly coaxiality of the diesel generator set according to the embodiment of the invention;
FIG. 4-1 is a view A-A of FIG. 4;
FIG. 5 is a schematic view of the state of the chock, the rotor connecting flange and the main generator housing during the detection of the assembly coaxiality of the diesel generator set according to the embodiment of the invention;
fig. 6 is a schematic structural diagram of the diesel generator set during assembly coaxiality detection according to the embodiment of the invention;
FIG. 7 is an assembled view of an embodiment of the present invention;
FIG. 8 is an assembly view of an embodiment of the present invention.
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. 4 to 8, some embodiments of the present invention disclose a method for detecting the assembly coaxiality of a diesel generator set, including the following steps:
adjusting the position of a rotor connecting flange 2 of a main generator to enable the rotor connecting flange 2 to be concentric with the mounting end face of a shell of the main generator;
and step two, measuring the distance between the mounting end face of the shell of the main generator and the mounting end face of the rotor connecting flange 2 of the main generator at different positions in the circumferential direction, and calculating to obtain an inclined included angle between the mounting end face of the rotor connecting flange 2 and the mounting end face of the shell based on the distance to serve as a coaxiality evaluation standard of the mounting faces of the rotor connecting flange 2 and the main generator shell 1.
Wherein, adjusting the position of the rotor connecting flange 2 of the main generator may comprise: and inserting the chock blocks 7 into the gaps between the rotor connecting flange 2 and the shell of the main generator, and adjusting the insertion depth of the chock blocks 7, wherein the chock blocks 7 are respectively arranged at the lower end and two sides of the rotor connecting flange 2.
The plug 7 is required to have a small end for insertion between the outer wall of the connection flange and the inner wall of the main generator housing 1, and a large end disposed opposite to the small end; the small end of the first contact surface and the small end of the second contact surface are the small ends of the chock 7.
The chock 7 includes the first contact surface that is used for the butt rotor flange 2 outer wall, and is used for the butt main generator housing 1 inner wall's second contact surface, wherein, first contact surface includes the first cambered surface of concave yield, the tip of first contact surface with the tip of second contact surface meets, the main aspects of first contact surface with the first distance has between the main aspects of second contact surface. The first cambered surface is approximately fan-shaped, and the first contact surface further comprises a first plane formed by extending the large end of the first cambered surface. The two sides of the first contact surface and the second contact surface are connected by two side surfaces. The line between the big end and the tip of first cambered surface, with form first contained angle between the second contact surface, first contained angle is 20 (20 +/-1 °). The concave curve of the first cambered surface is matched with the outer wall of the rotor connecting flange 2. The extension surfaces of the two side surfaces form a second included angle which is 98 degrees (98 degrees +/-3 degrees).
The insertion depth of the three chock blocks 7 positioned at the lower end and two sides of the connecting flange is adjusted, the width of the gap is measured at intervals of 90 degrees, four width values are obtained, and when the difference value of any two width values is smaller than 0.5mm, the rotor connecting flange 2 is considered to be concentric with the shell installation end face of the main generator.
Further, the calculation formula of the inclined included angle is
Wherein, theta is an inclined included angle, b is the distance between the installation end surface of the shell of the main generator and the installation end surface of the rotor connecting flange 2 of the main generator, and D is the diameter of the rotor connecting flange 2.
The chock 7 disclosed by some preferred embodiments of the invention is provided with an arc and an inclined slide way as shown in fig. 4 and fig. 4-1, so that the first connecting flange (rotor connecting flange 2) can be better supported and adjusted, the chock 7 is in an inverted isosceles trapezoid shape, the included angle between two sides is 98 degrees, and the arc chamfer with a large bottom can be better and stably attached to the arc of the main hair housing. The arc radius R of the sliding way of the chock 7 is the same as the radius of the first connecting flange, the optimal inclined plane angle of the arc sliding way is 20 degrees, namely the slope of 1:2.75 is too large, the insertion of the chock 7 is not facilitated, the slope is too small, and the adjustment of the first connecting flange is not facilitated. As shown in FIG. 5, the chock blocks 7 are respectively plugged into the bottom and the left and right sides of the first connecting flange, and the position of the first connecting flange is adjusted by the plugging of the chock blocks 7. And measuring the gap a between the first connecting flange and the periphery of the main generator shell 1 by using a vernier caliper, wherein the measuring method is that one point is measured at intervals of 90 degrees, and 4 measuring points are uniformly distributed on one circumference of the first connecting flange. When the difference between any two of the gaps at the 4 measuring points is less than or equal to 0.5mm, the flange is concentric with the mounting end face of the shell.
As shown in fig. 6, the distance b between the mounting end face of the main generator housing 1 and the edge of the mounting end face of the connecting flange is measured by measuring one point at intervals of 90 degrees, 4 measuring points are uniformly distributed on one circumference of the connecting flange, and only the distance b between the symmetrical 2 points is measured. As shown in the figure, if the diameter of the first connecting flange is D and the included angle between the mounting end surface of the first connecting flange and the mounting end surface of the main generator housing 1 is θ, the first connecting flange is fixed to the main generator housing 1
As can be seen from fig. 6, the included angle between the axis of the first connecting flange and the axis of the main generator housing 1 is equal to θ, so the angle θ can be used as an evaluation criterion for the coaxiality of the first connecting flange and the mounting surface of the main generator housing 1. According to experience, when theta is less than or equal to 0.3 degrees, the coaxiality of the first connecting flange and the main generator shell 1 meets the installation requirement.
The included angle theta reflects the proportional relation between b and D, and theta is not more than 0.3 degrees and can be used as a judgment standard for connecting flanges with different diameters D. The included angle theta is obtained by calculation, and for convenience of actual operation, the corresponding limit value of the distance b of the mounting end face can be calculated according to the diameter D of the common connecting flange, and if the diameter D is known and theta is less than or equal to 0.3 DEG, the included angle theta is calculated
And (3) formulating a measurement comparison table 1, comparing the actually measured distance b of the mounting end face with the limit b 'in the table, and when b is less than or equal to b', the coaxiality of the first connecting flange and the main generator shell 1 meets the mounting requirement.
TABLE 1 comparison of measured values
| Serial number | Diameter D of the flange | Limit value b' | Actual measurement b |
| 1 | D1 | b′1 | |
| 2 | D2 | b′2 | |
| 3 | D3 | b′3 |
As shown in fig. 7, an axis of the main generator connecting flange completely coincides with an axis of the main generator housing 1, and if an axis of the diesel engine flywheel 8 and an axis of the flywheel housing 9 also completely coincide, a fitting degree of a mounting end face of the connecting flange and a mounting end face of the diesel engine flywheel 8 is good, and stress caused by misalignment does not exist in a diesel generator set shaft system. As shown in fig. 8, the coincidence degree of the axis of the first main generator connecting flange and the axis of the main generator housing 1 is not good, an included angle α is formed between the first connecting flange mounting end face and the flywheel 8 mounting end face, and if the first connecting flange and the flywheel 8 are connected together, stress is generated in a diesel generator set shafting, the shafting is not stable in rotation, and vibration is generated to damage components. The detection method can effectively measure the contact ratio of the axis of the connecting flange and the axis of the main generator shell 1, namely whether the coaxiality can meet the requirement or not.
Before the diesel generating set is assembled, the coaxiality of an axis of a main generator connecting flange and an axis of a shell is detected. As shown in fig. 5 and 6, the first chock 7 is first plugged into the bottom and the left and right sides of the first connecting flange to adjust the position of the first connecting flange. And measuring the gap a between the first connecting flange and the periphery of the main generator shell 1 by using a vernier caliper, wherein the measuring method is that one point is measured at intervals of 90 degrees, and 4 measuring points are uniformly distributed on one circumference of the first connecting flange. When the difference between any two of the gap values of the 4 measuring points is less than or equal to 0.5mm, the flange is concentric with the mounting end face of the shell. Then, the distance b between the mounting end face of the main generator shell 1 and the edge of the mounting end face of the connecting flange is measured, and the measuring method is that one point is measured at intervals of 90 degrees. And comparing the measured value b with the limit b' according to a measured value comparison table in the table 1, and judging whether the coaxiality of the first connecting flange and the main generator shell 1 meets the installation requirement, otherwise, correcting the coaxiality of the rotor shaft 5 of the main generator.
In summary, in the method for detecting the assembly coaxiality of the diesel generator set disclosed by the embodiment of the invention, the position of the first main generator connecting flange is adjusted by using the chock with the arc and the inclined slide way; the chock block is in an inverted isosceles trapezoid shape, and the included angle between two waists is 98 degrees; the arc radius of the chock slide is the same as that of the connecting flange I, and the included angle between the chock slide and the horizontal plane is 20 degrees, namely the gradient is 1: 2.75; every 90 degrees is arranged, 4 measuring points are uniformly distributed on the circumference, and the gap a between the first connecting flange and the periphery of the main generator shell is measured; the included angle between the installation end face of the main generator shell and the edge of the installation end face of the connecting flange I is calculated by measuring the diameter D of the connecting flange I and the distance b between the installation end face of the main generator shell and the edge of the installation end face of the connecting flange I
The included angle between the axis of the first connecting flange and the axis of the main generator shell is theta, and the angle theta is used as an evaluation standard for coaxiality of the first connecting flange and the mounting surface of the main generator shell; theta is less than or equal to 0.3 degrees and is used as the requirement of coaxiality of the first connecting flange and the mounting surface of the main generator shell; compiling a table of b' corresponding to D and theta,
and simplifying a calculation program, and judging whether the coaxiality meets the requirements or not by comparing the actually measured b with the theory.
The problem that the coaxiality of a single-support main generator cannot be measured is solved; through measurement, a main generator with poor coaxiality is eliminated, the assembly centering precision of the diesel generator set is improved, vibration is reduced, and the working reliability of the diesel generator set is improved; the measuring method is simple and easy to operate, and can be operated on a construction site; the included angle theta is used as a coaxiality judgment standard, so that the method is more visual; and a comparison table is compiled, and an actual measurement value b is compared, so that a complicated calculation process is omitted, and the working efficiency is improved.
It should be particularly noted that the various components or steps in the above embodiments can be mutually intersected, replaced, added or deleted, and therefore, the combination formed by the reasonable permutation and combination conversion shall also belong to the protection scope of the present invention, and the protection scope of the present invention shall not be limited to the 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 (10)
1. A method for detecting the assembly coaxiality of a diesel generating set is characterized by comprising the following steps:
adjusting the position of a rotor connecting flange of a main generator to enable the rotor connecting flange to be concentric with the mounting end face of a shell of the main generator;
and secondly, measuring the distance between the mounting end face of the shell of the main generator and the mounting end face of the rotor connecting flange of the main generator at different circumferential positions, and calculating to obtain an inclined included angle between the mounting end face of the rotor connecting flange and the mounting end face of the shell based on the distance to serve as a coaxiality evaluation standard of the rotor connecting flange and the mounting face of the shell of the main generator.
2. The method of claim 1, wherein adjusting the position of the rotor attachment flange of the main generator comprises: and inserting the chock blocks into the gap between the rotor connecting flange and the shell of the main generator, and adjusting the insertion depth of the chock blocks, wherein the chock blocks are respectively arranged at the lower end and two sides of the rotor connecting flange.
3. The method of testing according to claim 2, wherein said plug block has a small end for insertion between said connection flange outer wall and said main generator housing inner wall, and a large end disposed opposite said small end;
the chock comprises a first contact surface for abutting the outer wall of the rotor attachment flange, and a second contact surface for abutting the inner wall of the main generator housing, wherein,
the first contact surface comprises a concave first arc surface, the small end of the first contact surface is connected with the small end of the second contact surface, and a first distance is reserved between the large end of the first contact surface and the large end of the second contact surface.
4. The inspection method of claim 3, wherein the first arcuate surface is generally fan-shaped, and wherein the first contact surface further comprises a first flat surface formed by a major end of the first arcuate surface extending therefrom.
5. The detection method according to claim 3, further comprising two side surfaces connecting both sides of the first contact surface and the second contact surface.
6. The inspection method of claim 3, wherein a line connecting the large end and the small end of the first arc surface forms a first angle with the second contact surface, the first angle being 20 ° ± 1 °.
7. The inspection method of claim 3, wherein the first curved concave curve is adapted to the rotor attachment flange outer wall.
8. The method of claim 2, wherein the insertion depth of three of said blocks at the lower end and both sides of said flange is adjusted and the width of said gap is measured at 90 ° intervals to obtain four width values, and when the difference between any two of said width values is less than 0.5mm, said rotor flange is considered concentric with the housing mounting end face of the main generator.
9. The detection method according to claim 5, wherein the extension surfaces of the two side surfaces form a second included angle, and the second included angle is 98 ° ± 3 °.
10. The detection method according to claim 1, wherein the calculation formula of the inclined included angle is
Wherein theta is an inclined included angle, b is the distance between the mounting end face of the shell of the main generator and the mounting end face of the rotor connecting flange of the main generator, and D is the diameter of the rotor connecting flange;
when the inclination angle is not more than 0.3 degrees, the coaxiality of the rotor connecting flange and the mounting surface of the main generator shell meets the assembly requirement.
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| CN101865645A (en) * | 2010-04-02 | 2010-10-20 | 攀钢集团冶金工程技术有限公司 | The installation and alignment method of the rotating shaft supported by the bearing bush with shim iron |
| CN202994070U (en) * | 2012-12-26 | 2013-06-12 | 神华集团有限责任公司 | Centering detection mechanism for rotor in motor transmission assembly |
| NL2011247C2 (en) * | 2013-07-31 | 2015-02-03 | Vervent B V | WIND TURBINE. |
| WO2015014045A1 (en) * | 2013-08-02 | 2015-02-05 | 上海交通大学 | Shafting accuracy test device for multi-axis vacuum manipulator |
| CN104279941A (en) * | 2014-10-28 | 2015-01-14 | 南车戚墅堰机车有限公司 | Diesel generating set coaxiality measuring method |
| CN105149933A (en) * | 2015-09-24 | 2015-12-16 | 中国北车集团大连机车车辆有限公司 | Alignment assembling method for diesel generating set |
| CN205655765U (en) * | 2016-04-28 | 2016-10-19 | 张家港中环海陆特锻股份有限公司 | A detection instrument for detecting flange bolt hole position error |
| CN205980988U (en) * | 2016-07-29 | 2017-02-22 | 谷香梅 | Circular cylinder degree of deformation that can automatic compress tightly detects frock |
| CN112629386A (en) * | 2020-12-08 | 2021-04-09 | 娄底市万宝新区开发投资集团有限公司 | Concentricity detection device for joint pin shaft of engineering machinery |
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