CN114739345A - Measuring device and method for large tapered roller rolling surface modification curve - Google Patents
Measuring device and method for large tapered roller rolling surface modification curve Download PDFInfo
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- CN114739345A CN114739345A CN202210542778.XA CN202210542778A CN114739345A CN 114739345 A CN114739345 A CN 114739345A CN 202210542778 A CN202210542778 A CN 202210542778A CN 114739345 A CN114739345 A CN 114739345A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 79
- 238000012986 modification Methods 0.000 title claims abstract description 58
- 230000004048 modification Effects 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 20
- 238000005259 measurement Methods 0.000 claims abstract description 19
- 238000011156 evaluation Methods 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000007493 shaping process Methods 0.000 description 6
- 238000013480 data collection Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000007704 transition 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
- 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
- G01B21/20—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 contours or curvatures, e.g. determining profile
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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
- G01B21/02—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 length, width, or thickness
Abstract
The invention relates to a device and a method for measuring a large-scale tapered roller rolling surface modification curve, which relate to the technical field of detection of rolling bearings, and the device and the method are characterized in that a cushion block (2) is arranged on a bidirectional reciprocating type moving platform (3), a large-scale tapered roller (6) is placed on the cushion block, then an auxiliary block (1) is arranged at the middle-upper position of a large-scale tapered roller reference end surface, and a data acquisition system using a contourgraph (5) adopts a high-precision auxiliary block to perform measurement reference conversion, so that the measurement difficulty of various indexes of the large-scale tapered roller rolling surface modification curve is solved, and the evaluation of the modification quantity of any point of a bus can be realized.
Description
Technical Field
The invention relates to the technical field of detection of rolling bearings, in particular to a device and a method for measuring a shaping curve of a rolling surface of a large tapered roller.
Background
As is known, in order to reduce stress concentration during use of a tapered roller bearing, a roller rolling surface modification curve is usually designed as a curve with a slightly convex entity, common modification curves have forms such as a logarithmic curve, a full arc, an arc-straight line-arc and the like, and main technical indexes of the modification curve include a maximum point offset distance of a convexity of the modification curve, a modification amount, a profile tolerance and the like.
At present, the bearing industry mainly adopts a profile gauge to measure various technical indexes of a tapered roller rolling surface modification curve, and during measurement, a measurement reference and rolling surface modification curve profile data need to be collected, wherein the data collection of the measurement reference is a key for evaluating the technical indexes of the modification curve profile. The data acquisition of the profile of the modification curve of the small and medium-sized tapered roller is generally to clamp and tilt the profile of the modification curve of the small and medium-sized tapered roller by an auxiliary clamp, after the adjustment, a contact pin of a contourgraph is used for acquiring data of a reference end face and a rolling surface bus of the roller, wherein the acquired reference profile is used as a measurement reference, and the acquired measurement reference is used for constructing and adjusting the profile of the roller bus so as to evaluate various technical indexes of the modification curve.
However, for the measurement of the large tapered roller, due to the large size and weight of the large tapered roller and the limitation of the acquisition range of the contact pin of the profiler, the contact pin of the profiler cannot completely acquire the reference end surface and the profile of the generatrix of the rolling surface of the large tapered roller, so that the measurement of various technical indexes of the shaping curve of the rolling surface of the large tapered roller cannot be realized, and the like, so that a device and a method for measuring the shaping curve of the rolling surface of the large tapered roller are urgently needed to be provided to solve the measurement problem of the technical indexes of the shaping curve of the rolling surface of the large tapered roller.
Disclosure of Invention
In order to overcome the defects in the background technology, the invention provides a device and a method for measuring the rolling surface modification curve of the large tapered roller.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the utility model provides a large-scale tapered roller rolling surface profile modification curve's measuring device, includes auxiliary block, cushion, two-way reciprocating type moving platform, base and profile appearance be equipped with two-way reciprocating type moving platform on the base be equipped with the profile appearance on the base of two-way reciprocating type moving platform one side, be equipped with the cushion on two-way reciprocating type moving platform be equipped with large-scale tapered roller in the V type inslot on the cushion the well upper position of large-scale tapered roller reference terminal surface is equipped with the auxiliary block, the contact pilotage butt auxiliary block of profile appearance.
According to the measuring device for the profile modification curve of the rolling surface of the large tapered roller, the matching surface on the auxiliary block is adsorbed at the middle upper position of the reference end surface of the large tapered roller.
According to the measuring device for the rolling surface modification curve of the large tapered roller, the working surface A and the working surface B on the auxiliary block are higher than the end chamfer of the large tapered roller.
According to the measuring device for the profile modification curve of the rolling surface of the large tapered roller, the V-shaped groove formed in the cushion block is in a straight line shape or a cross shape.
The measuring device for the rolling surface modification curve of the large tapered roller is characterized in that the base is a bench worker platform, and a groove for the bidirectional reciprocating type moving platform to move left and right is formed in the bench worker platform.
The bidirectional reciprocating type moving platform is a moving platform with the function of accurately adjusting the transverse position and the longitudinal position.
A measuring method for a large tapered roller rolling surface modification curve specifically comprises the following steps:
the method comprises the following steps that firstly, a large tapered roller is stably placed in a V-shaped groove in a cushion block, an auxiliary block is adsorbed on the reference end face of the large tapered roller, the large tapered roller and the auxiliary block form a body to be measured, and the working face A and the working face B of the auxiliary block are higher than the end chamfer of the large tapered roller;
secondly, adjusting a bidirectional reciprocating type moving platform to drive a large tapered roller on a cushion block to move, and determining a rolling surface bus of the large tapered roller;
thirdly, acquiring surface bus contour data of the body to be measured by using a contour gauge through a contact pin;
and fourthly, adjusting and constructing the acquired data through a software system on the contourgraph, and evaluating the technical index of the rolling surface modification curve of the large tapered roller by using the acquired profile data of the auxiliary block as an adjustment reference.
The method for measuring the rolling surface modification curve of the large tapered roller comprises the following steps:
firstly, adjusting a bidirectional reciprocating type moving platform to enable the left end and the right end of a large tapered roller to be located at the highest positions, and determining the position of a rolling surface bus;
secondly, data acquisition is carried out on a working surface A and a working surface B of the auxiliary block and a complete rolling surface bus of the large-sized tapered roller through a contourgraph;
thirdly, analyzing and evaluating data acquired by the profiler through analysis software carried by the profiler, and determining the axial direction of the roller by taking a line L1 on a working surface A of the auxiliary block as a horizontal reference;
fourthly, taking an intersection point C of a line L1 on the working surface A of the auxiliary block and an L2 on the working surface B as a starting point in the axial direction of the rolling surface of the large tapered roller, so as to determine the position of a theoretical convexity central point A on the generatrix of the rolling surface;
and fifthly, performing anticlockwise angle compensation on the line L1 through the known half cone angle of the large tapered roller, and determining the position of an actual maximum convexity point A' on the bus by taking the line L3 at the compensated angle as a horizontal reference, so as to obtain the maximum convexity point offset distance L4.
The method for measuring the rolling surface modification curve of the large tapered roller comprises the following steps of: and marking a point B which is on the generatrix and is at an arbitrary distance L5 from the point A by taking the maximum theoretical convexity point A as the axial original point of the large tapered roller, and determining the modification quantity H of any point on the generatrix of the rolling surface of the large tapered roller by measuring the vertical distance between the point A and the point B.
The method for measuring the rolling surface modification curve of the large tapered roller comprises the following steps of: and comparing the input theoretical profile curve with the acquired data to obtain the deviation between the rolling surface bus and the theoretical profile curve, thereby realizing the profile tolerance measurement of the rolling surface bus of the large tapered roller.
By adopting the technical scheme, the invention has the following advantages:
according to the invention, the cushion block is arranged on the bidirectional reciprocating type moving platform, the large tapered roller is placed on the cushion block, the auxiliary block is arranged at the middle-upper position of the reference end surface of the large tapered roller, and the high-precision auxiliary block is adopted for measurement reference conversion by using the contourgraph, so that the measurement problem of various indexes of the shaping curve of the rolling surface of the large tapered roller is solved, and the evaluation of the shaping quantity of any point of the bus can be realized.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic front view of the structure of FIG. 1;
FIG. 3 is a partially enlarged schematic view of FIG. 2;
FIG. 4 is a left side view structural diagram of FIG. 1;
FIG. 5 is a schematic perspective view of an auxiliary block according to the present invention;
FIG. 6 is a schematic structural view of a large tapered roller according to the present invention;
FIG. 7 is a schematic view of a method for measuring a modification curve of a rolling surface of a large tapered roller according to the present invention;
in the figure: 1. an auxiliary block; 101. a working face A; 102. a working face B; 103. a mating surface; 2. cushion blocks; 3. a bi-directional reciprocating mobile platform; 4. a base; 5. a profilometer; 6. large tapered rollers.
Detailed Description
The present invention will be explained in more detail by the following examples, which are not intended to limit the invention;
it should be noted that the directions or positional relationships indicated by "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., used in describing the structures of the present invention are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention.
The measuring device for the large tapered roller rolling surface modification curve shown in the attached drawings 1-7 comprises an auxiliary block 1, a cushion block 2, a bidirectional reciprocating type moving platform 3, a base 4 and a contourgraph 5, wherein the base 4 is a bench work platform, the bidirectional reciprocating type moving platform 3 is arranged on the base 4, the bidirectional reciprocating type moving platform 3 is a moving platform with the function of accurately adjusting the transverse position and the longitudinal position, and in the implementation process, the bidirectional reciprocating type moving platform 3 is a conventional standard product and can be directly purchased and obtained from the market, so that the detailed description of the specific structure of the bidirectional reciprocating type moving platform is omitted; the base 4 on one side of the bidirectional reciprocating type moving platform 3 is provided with the contourgraph 5, and during implementation, the contourgraph 5 is also a conventional standard product and can be directly purchased and obtained from the market, so that detailed description on the specific structure of the contourgraph 5 is not required; be equipped with cushion 2 on two-way reciprocating type moving platform 3, the shape of the V type groove that sets up on cushion 2 is a font or cross be equipped with large-scale tapered roller 6 in the V type groove on cushion 2 the well upper position of large-scale tapered roller 6 benchmark terminal surface is equipped with supplementary piece 1, profile appearance 5's contact pilotage butt supplementary piece 1.
In specific implementation, the working surface a101 and the working surface B102 on the auxiliary block 1 are higher than the end chamfer of the large tapered roller 6, and the matching surface 103 on the auxiliary block 1 is adsorbed at the middle-upper position of the reference end surface of the large tapered roller 6. In implementation, the working surface a101 and the working surface B102 on the auxiliary block 1 are slightly higher than the end chamfer of the large tapered roller 6, and because the working surfaces are too high, the falling height of the contact pin is large when the auxiliary block 1 and the roller are in transition, which may affect the measurement result; the structure of the large tapered roller 6 is specifically shown in fig. 6, and a point a in fig. 6 is a theoretical convexity maximum value point; the point B is any point on the rolling surface bus; the height H is the fall between the point A and the point B, namely the modification amount; l5 is the distance between any point on the rolling surface generatrix and the maximum point of the theoretical convexity; l6 is the distance from the theoretical convexity maximum point to the reference end face.
Furthermore, the auxiliary block 1 is a small three-dimensional geometric body, the main surface of the auxiliary block is provided with two working surfaces and a matching surface, the working surface A101 and the working surface B102 of the auxiliary block 1 form an obtuse angle with a fixed angle, the included angle between the working surface A101 and the matching surface 103 is 90 degrees, and the working surface A101, the working surface B102 and the matching surface 103 are all perpendicular to the same plane; the auxiliary block 1 is attached to the end face of the large-sized tapered roller 6 through the matching surface 103, the auxiliary block 1 and the rolling surface of the large-sized tapered roller 6 form an object to be measured, wherein a working surface A101 and a working surface B102 of the auxiliary block 1 and a generatrix of the rolling surface of the large-sized tapered roller 6 form a contour to be measured; a measuring body formed by the auxiliary block 1 and the rolling surface of the large-sized tapered roller 6 is arranged on a cushion block 2 with a V-shaped through groove in the middle; the cushion block 2 is arranged on a bidirectional reciprocating type moving platform 3 which can carry out accurate adjustment on the transverse position and the longitudinal position in the horizontal direction; the bidirectional reciprocating type mobile platform 3 is arranged on a base of a contourgraph 5 or an independent base 4, actual selection is carried out according to the type and the size of the contourgraph 5, the contourgraph 5 is a conventional high-precision contourgraph, a contact pin of the contourgraph 5 carries out data acquisition on a measured profile, and a software system of the contourgraph 5 evaluates measured data.
A measuring method for a large tapered roller rolling surface modification curve specifically comprises the following steps:
the method comprises the following steps that firstly, a large-sized tapered roller 6 is stably placed in a V-shaped groove in a cushion block 2, an auxiliary block 1 is adsorbed on the reference end face of the large-sized tapered roller 6, the large-sized tapered roller 6 and the auxiliary block 1 form a body to be measured, and the working face A101 and the working face B102 of the auxiliary block 1 are higher than the end chamfer of the large-sized tapered roller 6;
secondly, the large tapered roller 6 on the cushion block 2 is driven to move by adjusting the bidirectional reciprocating type moving platform 3, and a rolling surface bus of the large tapered roller 6 is determined;
thirdly, acquiring surface bus contour data of the body to be measured by using a contour gauge 5 through a contact pin;
and fourthly, adjusting and constructing the acquired data through a software system on the contourgraph 5, and evaluating the technical index of the rolling surface modification curve of the large tapered roller 6 by using the acquired profile data of the auxiliary block 1 as an adjustment reference.
In specific implementation, as shown in fig. 7, the method for evaluating the offset distance of the maximum convexity point in the technical index of the rolling surface modification curve includes the following steps:
firstly, adjusting a bidirectional reciprocating type moving platform 3 to enable the left end and the right end of a large tapered roller 6 to be located at the highest positions, and determining the position of a rolling surface bus;
secondly, carrying out data acquisition on a working surface A101 and a working surface B102 of the auxiliary block 1 and a complete rolling surface bus of the large-sized tapered roller 6 through a contourgraph 5;
thirdly, analyzing and evaluating the data acquired by the profiler 5 through analysis software carried by the profiler, and determining the axial direction of the roller by taking a line L1 on a working surface A101 of the auxiliary block 1 as a horizontal reference;
fourthly, taking an intersection point C of a line L1 on the working surface A101 of the auxiliary block 1 and an L2 on the working surface B102 as a starting point for determining the axial direction of the rolling surface of the large-sized tapered roller 6, thereby determining the position of a theoretical convexity center point A on the generatrix of the rolling surface;
and fifthly, performing anticlockwise angle compensation on the line L1 through the known half cone angle of the large-sized tapered roller 6, and determining the position of an actual maximum convexity point A' on the bus by taking the line L3 on the compensated angle as a horizontal reference, so as to obtain the maximum convexity point offset distance L4.
Further, the method for evaluating the modification amount in the technical index of the rolling surface modification curve comprises the following steps: and marking a point B which is on the generatrix and is at an arbitrary distance L5 from the point A by taking the maximum theoretical convexity point A as the axial original point of the large-sized tapered roller 6, and determining the modification quantity H of any point on the generatrix of the rolling surface of the large-sized tapered roller 6 by measuring the vertical distance between the point A and the point B.
Further, the evaluation method of the profile degree in the technical indexes of the rolling surface modification curve comprises the following steps: and comparing the input theoretical profile curve with the acquired data to obtain the deviation between the rolling surface bus and the theoretical profile curve, thereby realizing the profile tolerance measurement of the rolling surface bus of the large tapered roller 6.
The invention uses the contourgraph 5 to carry out measurement reference conversion by adopting the high-precision auxiliary block 1, solves the measurement problem of various indexes of the rolling surface modification curve of the large tapered roller 6, can realize the evaluation of the modification amount of any point of a bus, and is also suitable for the measurement of technical indexes of the rolling surface modification curve of a cylindrical roller and a self-aligning roller.
The invention is not described in detail in the prior art.
The embodiments chosen for the purpose of disclosure of the invention are presently considered to be suitable, however, it is to be understood that the invention is intended to cover all variations and modifications of the embodiments which fall within the spirit and scope of the invention.
Claims (10)
1. The utility model provides a curved measuring device of large-scale tapered roller rolling surface modification, includes auxiliary block (1), cushion (2), two-way reciprocating type moving platform (3), base (4) and profile appearance (5), characterized by: be equipped with two-way reciprocating type moving platform (3) on base (4) be equipped with profile appearance (5) on base (4) of two-way reciprocating type moving platform (3) one side be equipped with cushion (2) on two-way reciprocating type moving platform (3) be equipped with large-scale tapered roller (6) in the V type inslot on cushion (2) the well upper position of large-scale tapered roller (6) benchmark terminal surface is equipped with auxiliary block (1), the contact pilotage butt auxiliary block (1) of profile appearance (5).
2. The device for measuring the rolling surface modification curve of the large-sized tapered roller as claimed in claim 1, wherein: and the matching surface (103) on the auxiliary block (1) is adsorbed at the middle upper position of the reference end surface of the large tapered roller (6).
3. The device for measuring the rolling surface modification curve of the large-sized tapered roller as claimed in claim 1, wherein: the working surface A (101) and the working surface B (102) on the auxiliary block (1) are higher than the end chamfer of the large-sized tapered roller (6).
4. The device for measuring the rolling surface modification curve of the large-sized tapered roller as claimed in claim 1, wherein: the V-shaped groove arranged on the cushion block (2) is in a straight line shape or a cross shape.
5. The device for measuring the rolling surface modification curve of the large-sized tapered roller as claimed in claim 1, wherein: the base (4) is a bench work platform, and a groove for the bidirectional reciprocating type moving platform (3) to move left and right is formed in the bench work platform.
6. The device for measuring the rolling surface modification curve of the large-sized tapered roller as claimed in claim 1, wherein: the bidirectional reciprocating type moving platform (3) is a moving platform with the function of accurately adjusting the transverse position and the longitudinal position.
7. The method for measuring the rolling surface modification curve of the large-sized tapered roller as claimed in any one of claims 1 to 6, wherein the method comprises the following steps: the measuring method specifically comprises the following steps:
the method comprises the following steps that firstly, a large-sized tapered roller (6) is stably placed in a V-shaped groove in a cushion block (2), an auxiliary block (1) is adsorbed on the reference end face of the large-sized tapered roller (6), the large-sized tapered roller (6) and the auxiliary block (1) form a body to be measured, and a working face A (101) and a working face B (102) on the auxiliary block (1) are higher than the end chamfer of the large-sized tapered roller (6);
secondly, the large tapered roller (6) on the cushion block (2) is driven to move by adjusting the bidirectional reciprocating type moving platform (3), and a rolling surface bus of the large tapered roller (6) is determined;
thirdly, acquiring surface bus contour data of the body to be measured by using a contour gauge (5) through a contact pin;
and fourthly, adjusting and constructing the acquired data through a self-contained software system on the contourgraph (5), and evaluating the technical index of the rolling surface modification curve of the large tapered roller (6) by using the acquired profile data of the auxiliary block (1) as an adjustment reference.
8. The method for measuring the rolling surface modification curve of the large-sized tapered roller as claimed in claim 7, wherein the method comprises the following steps: the method for evaluating the offset distance of the maximum convexity point in the technical index of the rolling surface modification curve comprises the following steps:
firstly, adjusting a bidirectional reciprocating type moving platform (3) to enable the left end and the right end of a large tapered roller (6) to be at the highest positions and determine the position of a rolling surface bus;
secondly, carrying out data acquisition on a working surface A (101) and a working surface B (102) of the auxiliary block (1) and a complete rolling surface bus of the large-sized tapered roller (6) through a contourgraph (5);
thirdly, analyzing and evaluating data collected by the profiler (5) through self-contained analysis software on the profiler (5), and determining the axial direction of the roller by taking a line L1 on a working surface A (101) of the auxiliary block (1) as a horizontal reference;
fourthly, taking an intersection point C of a line L1 on a working surface A (101) of the auxiliary block (1) and an L2 on a working surface B (102) as a starting point for determining the axial direction of the rolling surface of the large tapered roller (6), thereby determining the position of a theoretical convexity center point A on a generatrix of the rolling surface;
and fifthly, performing counterclockwise angle compensation on the line L1 through the known half cone angle of the large tapered roller (6), and determining the position of an actual convexity maximum point A' on the bus by taking the line L3 on the compensated angle as a horizontal reference, thereby obtaining the convexity maximum point offset distance L4.
9. The method for measuring the rolling surface modification curve of the large-sized tapered roller as claimed in claim 7, wherein the method comprises the following steps: the method for evaluating the modification amount in the technical indexes of the rolling surface modification curve comprises the following steps: and (3) marking a point B which is on the generatrix and is at an arbitrary distance L5 from the point A by taking the maximum theoretical convexity point A as the axial origin of the large tapered roller (6), and determining the modification quantity H of any point on the generatrix of the rolling surface of the large tapered roller (6) by measuring the vertical distance between the point A and the point B.
10. The method for measuring the rolling surface modification curve of the large-sized tapered roller as claimed in claim 7, wherein the method comprises the following steps: the evaluation method of the profile degree in the technical indexes of the rolling surface modification curve comprises the following steps: the deviation between the rolling surface bus and the theoretical profile curve is obtained by comparing the input theoretical profile curve with the acquired data, and the profile tolerance measurement of the rolling surface bus of the large tapered roller (6) is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210542778.XA CN114739345B (en) | 2022-05-19 | Device and method for measuring profile modification curve of rolling surface of large tapered roller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210542778.XA CN114739345B (en) | 2022-05-19 | Device and method for measuring profile modification curve of rolling surface of large tapered roller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114739345A true CN114739345A (en) | 2022-07-12 |
| CN114739345B CN114739345B (en) | 2024-04-26 |
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|---|---|---|---|---|
| CN117268967A (en) * | 2023-11-21 | 2023-12-22 | 上海尚轴轴承质量检测所有限公司 | Bearing tapered roller hardness detection workbench and detection and calibration method |
| CN117268967B (en) * | 2023-11-21 | 2024-02-02 | 上海尚轴轴承质量检测所有限公司 | Bearing tapered roller hardness detection workbench and detection and calibration method |
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Country or region after: China Address after: 471039 No. 96, Jianxi, Luoyang District, Henan, Jianshe Road Applicant after: Luoyang Bearing Group Co.,Ltd. Address before: 471039 No. 96, Jianxi, Luoyang District, Henan, Jianshe Road Applicant before: LUOYANG LYC BEARING Co.,Ltd. Country or region before: China |
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