CN100386597C - Apparatus for detecting axial free-gap of freight carrier rolling bearing and its fitting height, and method thereof - Google Patents
Apparatus for detecting axial free-gap of freight carrier rolling bearing and its fitting height, and method thereof Download PDFInfo
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- CN100386597C CN100386597C CNB2006100100607A CN200610010060A CN100386597C CN 100386597 C CN100386597 C CN 100386597C CN B2006100100607 A CNB2006100100607 A CN B2006100100607A CN 200610010060 A CN200610010060 A CN 200610010060A CN 100386597 C CN100386597 C CN 100386597C
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Abstract
The present invention relates to a device for detecting an axial free gap of a wagon rolling bearing and assembling height, and a method for the detection thereof, which belong to the field of wagon bearing detection. The present invention solves the problem that when the axial free gap and the assembling height are measured by the existing wagon bearing detecting method, human error and low measuring accuracy are easily caused. The present invention uses a first grating displacement sensor (3) to measure the axial free gap of a wagon rolling bearing, and a second grating displacement sensor (4) to measure the assembling height of the wagon rolling bearing. The data detected by the two grating displacement sensors is transmitted to an SCM control unit after the treatment of a CPLD processing unit and then is transmitted to an outer device. When the axial free gap is detected, a bearing inner circle (1) is tightly pressed and fixed. A measuring head of the first grating displacement sensor (3) is in contact with the upper end surface of a bearing outer circle (2). The bearing outer circle (2) is jacked up to enable the upward compressed distance of the first grating displacement sensor (3) to be the measured axial free gap. The present invention avoids the human error, and increases the measuring accuracy.
Description
Technical field
The invention belongs to the freight car bearing detection range.
Background technology
The freight car rolling bearing play is meant that bearing be not installed on axle or during bearing housing, its inner ring or outer ring is being fixed, the amount of movement when making loose part do axially or move radially then.According to moving direction, can be divided into end-play and end-play.Wherein, end-play is bigger to influences such as the load-bearing capacity of bearing and serviceable lifes.End-play is too small, heating easily, and the temperature difference between the Internal and external cycle is bigger; End-play is excessive, and lorry is the compartment shake when running at high speed.Therefore, need carry out prophylactic repair, meet the demands to guarantee its end-play to freight car bearing.End-play is one of key index parameter of freight car rolling bearing.
Axial play of rolling bearing and assembling high detection device that current rail freight car bearing maintenance department uses, its main measuring principle is for to place worktable with bearing, apply acting force from the worktable below, with bearing inner race jack-up and fixing, the outer ring freedom is sagging, measures the assembling height and reads play measured value for the first time, makes 180 ° of bearing upsets then, read play measured value for the second time, the difference of twice measured value is exactly the end-play of bearing.In the play measuring process, the method that adopts manual swivel bearing to carry out multimetering, artificial calculating averaged, and obtains the measured value of twice play respectively.The personal error of this measuring method reading is big, and that measure dot number is averaged for a long time is time-consuming especially, effort, and the bearing outer ring that brings of switching process moves radially and not only influenced the accuracy of measuring, and brings hidden danger for simultaneously operating personnel's safety.
In addition, patent publication No. is the patent of CN 1193725A " method for measuring axial clearance of double-row conical bearing " by name, has provided a kind of method that is used to measure axial clearance of double-row conical bearing.This method is that the inner ring of measured double-row conical bearing is fixed, on its outer ring, add an external force load from bottom to top, eliminate roller ball basal plane in its inner assembly and the gap between the straight rib of inner ring, measure the upper and lower mobile ultimate value of bearing outer ring by the play instrument then, the difference of calculating the two has just obtained the play value.The advantage of this method is to need not upset can obtain the play value, saves Measuring Time, reduces potential safety hazard.But it still will use the end-play detector to measure, and has so not only delayed Measuring Time, and because artificial reading brings inevitable error, can not guarantee higher measuring accuracy, also influences efficiency of measurement simultaneously.
Summary of the invention
Detect to measure end-play and assemble and cause personal error, the problem that measuring accuracy is low easily when high in order to solve existing freight car bearing, the invention provides a kind of axial free-gap of freight carrier rolling bearing and assembling high detection device and detection method.
Pick-up unit of the present invention comprises first grating displacement sensor, second grating displacement sensor, two data Acquisition Circuit, CPLD processing unit, input equipment, Single-chip Controlling unit and LCD display, first grating displacement sensor is used to measure the end-play of freight car rolling bearing, and the measuring head of first grating displacement sensor contacts with the upper surface of bearing outer ring; Second grating displacement sensor is used to measure the assembling height of freight car rolling bearing, and the measuring head of second grating displacement sensor contacts with the upper surface of bearing inner race; The output terminal of first grating displacement sensor connects the end-play data input pin of CPLD processing unit by a data Acquisition Circuit, the output terminal of second grating displacement sensor connects the high data input pin of assembling of CPLD processing unit by another data acquisition circuit, the data output end of CPLD processing unit connects the data input pin of Single-chip Controlling unit, the CPLD control signal output ends of Single-chip Controlling unit connects the signal input end of CPLD processing unit, the demonstration output terminal of Single-chip Controlling unit connects the data input pin of LCD display, the display control signal output terminal of Single-chip Controlling unit connects the signal input end of LCD display, and the output terminal of input equipment connects the external control signal input end of Single-chip Controlling unit.Pick-up unit of the present invention can obtain the data message of a plurality of different measuring points by the position of adjusting first grating displacement sensor and second grating displacement sensor.
Axial free-gap of freight carrier rolling bearing of the present invention and assemble high detection method and carry out as follows: the end-play that, detects freight car rolling bearing: earlier freight car rolling bearing is placed in test desk above, bearing inner race is supported by the upper surface of test desk, bearing outer ring is because gravity freely is suspended on the bearing inner race, on the upper surface of bearing inner race, apply the first downward acting force by pressure apparatus, this moment, bearing inner race was secured in a press, and the measuring head of first grating displacement sensor contacts with the upper surface of bearing outer ring; Then, apply second acting force upwards in the bottom of bearing outer ring, make the bearing outer ring jack-up that makes progress, first grating displacement sensor has upwards been compressed a segment distance A simultaneously, and then detected this segment distance of first grating displacement sensor A is exactly the end-play of bearing; Two, detect the assembling height of freight car rolling bearing: after being secured in a press in bearing inner race such as the step 1, the measuring head of second grating displacement sensor is contacted with the upper surface of bearing inner race, and second grating displacement sensor moves down till can not being compressed again, this moment, second grating displacement sensor was in final position, at last, the final position of measuring second grating displacement sensor is a with the distance of the upper surface of measuring table top, second grating displacement sensor is compressed distance and is C, then the high h of the assembling of freight car rolling bearing calculates as follows: h=a-(B-C), wherein B is the length of measuring head under free state of second grating displacement sensor.The pressure apparatus that adopts among the present invention can utilize hydraulic means to realize its function, and the general pressure size is 10～12 atmospheric pressure.
Apparatus of the present invention adopt the high precision grating displacement sensor as detection part, improved accuracy of detection greatly, and adopt single-chip microcomputer and CPLD to realize the collection and the processing of measurement data, directly show play and assemble high measured value by liquid crystal, avoided personal error, thereby further improved measuring accuracy, measuring accuracy reaches about 10 μ m, and measurement range is about 10mm.The present invention adopts the mode of solid bearing inner ring, hydraulic-driven jack-up outer ring, has eliminated the bearing rotary movement, realizes the reliable and stable measurement of end-play, and improves the security of testing staff when measuring.System of the present invention antijamming capability is strong, can artificially set measure dot number, bearing designation, measurement boundary etc., thereby improved the dirigibility and the applicability that detect.
Description of drawings
Fig. 1 is the synoptic diagram that the present invention detects the end-play of freight car rolling bearing; Fig. 2 is the high synoptic diagram of assembling that detects freight car rolling bearing; Fig. 3 is the structural representation of pick-up unit of the present invention; Fig. 4 is the structural representation of embodiment three.
Embodiment
Embodiment one: referring to Fig. 1 and Fig. 2, the axial free-gap of freight carrier rolling bearing of this embodiment and assemble high detection method and carry out as follows: one, detect the end-play of freight car rolling bearing: referring to Fig. 1, earlier freight car rolling bearing is placed in test desk 13 above, bearing inner race 1 is supported by the upper surface of test desk 13, bearing outer ring 2 freely is suspended on the bearing inner race 1 owing to gravity, on the upper surface of bearing inner race 1, apply the first downward directed force F 1 by pressure apparatus, this moment, bearing inner race 1 was secured in a press, and the measuring head of first grating displacement sensor 3 contacts with the upper surface of bearing outer ring 2; Then, apply second directed force F 2 upwards in the bottom of bearing outer ring 2, make upwards jack-up of bearing outer ring 2, first grating displacement sensor 3 has upwards been compressed a segment distance A simultaneously, and then first grating displacement sensor, 3 detected this segment distance A are exactly the end-play of bearing; Two, detect the assembling height of freight car rolling bearing: referring to Fig. 2, after bearing inner race 1 is secured in a press in as step 1, the measuring head of second grating displacement sensor 4 is contacted with the upper surface of bearing inner race 1, and second grating displacement sensor 4 moves down till can not being compressed again, this moment, second grating displacement sensor 4 was in final position, at last, the final position of measuring second grating displacement sensor 4 is a with the distance of the upper surface of measuring table top 14, second grating displacement sensor 4 is compressed distance and is C, then the high h of the assembling of freight car rolling bearing calculates as follows: h=a-(B-C), wherein B is the length of measuring head under free state of second grating displacement sensor 4.
Referring to Fig. 3, the device of this embodiment is made up of first grating displacement sensor 3, second grating displacement sensor 4, two data Acquisition Circuit 5, CPLD processing unit 6, input equipment 11, Single-chip Controlling unit 12 and LCD display 7, first grating displacement sensor 3 is used to measure the end-play of freight car rolling bearing, and the measuring head of first grating displacement sensor 3 contacts with the upper surface of bearing outer ring 2; Second grating displacement sensor 4 is used to measure the assembling height of freight car rolling bearing, and the measuring head of second grating displacement sensor 4 contacts with the upper surface of bearing inner race 1; The output terminal of first grating displacement sensor 3 connects the end-play data input pin of CPLD processing unit 6 by a data Acquisition Circuit 5, the output terminal of second grating displacement sensor 4 connects the high data input pin of assembling of CPLD processing unit 6 by another data acquisition circuit 5, the data output end of CPLD processing unit 6 connects the data input pin of Single-chip Controlling unit 12, the CPLD control signal output ends of Single-chip Controlling unit 12 connects the signal input end of CPLD processing unit 6, the demonstration output terminal of Single-chip Controlling unit 12 connects the data input pin of LCD display 7, the display control signal output terminal of Single-chip Controlling unit 12 connects the signal input end of LCD display 7, and the output terminal of input equipment 11 connects the external control signal input end of Single-chip Controlling unit 12.Described input equipment 11 is a keyboard.Described CPLD processing unit 6 mainly is the measurement data that is used to handle first grating displacement sensor 3,4 acquisitions of second grating displacement sensor, and the employing model is the process chip of EPM7128SLC84-10 (84).The model that described Single-chip Controlling unit 12 main chip adopt is C8051F020, its main effect is the measuring task of finishing that makes the whole measuring system coordinating and unifying, and has the function of supporting keyboard input concrete operations information, liquid crystal display operation information and measured value and printout metrical information; The value a that described Single-chip Controlling unit 12 also has according to the keyboard input calculates the function that obtains the high h of assembling with value B.Described data acquisition circuit 5 is used to amplify the simulating signal of grating displacement sensor output, and its simulating signal is carried out analog to digital conversion and process of frequency multiplication.
Embodiment two: referring to Fig. 3, this embodiment with the difference of the concrete side of enforcementing mode one is: described each data acquisition circuit 5 is made up of amplification and negative circuit 5-1 and analog to digital conversion and frequency multiplier circuit 5-2, the output terminal of first grating displacement sensor 3 connects the input end of amplification and negative circuit 5-1, amplify and the output terminal connection mode number conversion of negative circuit 5-1 and the input end of frequency multiplier circuit 5-2, the output terminal of analog to digital conversion and frequency multiplier circuit 5-2 connects the end-play data input pin of CPLD processing unit 6.Second grating displacement sensor 4 is identical with embodiment two with the annexation of data acquisition circuit 5.Other compositions and annexation thereof are identical with embodiment one.The main demonstration measuring accuracy that needs grating to reach that relies on of the size of times value determines that it makes and the careful more measurement result that shows exactly of the utility model makes that also measurement result is more accurate among analog to digital conversion and the frequency multiplier circuit 5-2.
Embodiment three: referring to Fig. 3 and Fig. 4, this embodiment with the difference of embodiment two is: in a data Acquisition Circuit 5, it is the five segmentation frequency multiplication chip U1 of SJ0205 that the master chip of analog to digital conversion and frequency multiplier circuit 5-2 adopts model, amplification and negative circuit 5-1 are by the first operational amplifier Q1, the second operational amplifier Q2, the 3rd operational amplifier Q3, first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the first variable resistor R6 and the second adjustable resistance R7 form, first grating displacement sensor 3 has sin,-sin, cos, four signal output parts of-cos, the sin signal output part of first grating displacement sensor 3 connects the end of first resistance R 1 and the second adjustable resistance R7, the other end of first resistance R 1 connects the in-phase input end of the first operational amplifier Q1, first grating displacement sensor 3-the sin signal output part connects an end of the 3rd resistance R 3 and the other end of the second adjustable resistance R7, the movable terminal of the second adjustable resistance R7 is positioned at middle and connects signal ground, the other end of the 3rd resistance R 3 connects the inverting input of the first operational amplifier Q1, the output terminal of the first operational amplifier Q1 connects the sin signal input part of five segmentation frequency multiplication chip U1 and the inverting input of the 3rd operational amplifier Q3, the in-phase input end of the 3rd operational amplifier Q3 connects signal ground by the 4th resistance R 4, the output terminal of the 3rd operational amplifier Q3 connects five segmentation frequency multiplication chip U1's-the sin signal input part, the cos signal output part of first grating displacement sensor 3 connects the end of the 5th resistance R 5 and the first variable resistor R6, the other end of the 5th resistance R 5 connects the in-phase input end of the second operational amplifier Q2, first grating displacement sensor 3-the cos signal output part connects an end of second resistance R 2 and the other end of the first variable resistor R6, the movable terminal of the first variable resistor R6 is positioned at middle and connects signal ground, the other end of second resistance R 2 connects the inverting input of the second operational amplifier Q2, and the output terminal of the second operational amplifier Q2 connects the cos signal input part of five segmentation frequency multiplication chip U1; The O1 of five segmentation frequency multiplication chip U1 is connected two data input ends of CPLD processing unit 6 with the O2 output terminal.The model that first grating displacement sensor 3 and second grating displacement sensor 4 adopt is GCQ.It is the chip of AD620 that the first operational amplifier Q1 and the second operational amplifier Q2 adopt model, and it is the chip of OP07H that the 3rd operational amplifier Q3 adopts model.Other compositions and annexation thereof are identical with embodiment two.What grating displacement sensor was exported is sinusoidal signal, and it just sends a sine wave whenever probe moves a pitch in the process of real work; Its frequency depends on distance and the run duration that probe moves.
Embodiment four: referring to Fig. 3, this embodiment with the difference of concrete enforcement side mode one is: described pick-up unit also comprises output device 8 and system clock circuit 10, the data output end of Single-chip Controlling unit 12 connects the data input pin of output device 8, the output control signal output ends of Single-chip Controlling unit 12 connects the signal input end of output device 8, and the output terminal of system clock circuit 10 connects the date signal input part of Single-chip Controlling unit 12.Other compositions and annexation thereof are identical with embodiment one.Described output device 8 comprises printer etc.; It is the chip of DS1302 that described system clock circuit 10 adopts model, and it is used to write down the date and the time of detection.。
Embodiment five: referring to Fig. 3, this embodiment with the difference of embodiment one is: described pick-up unit also comprises serial communication module 9, and the data transmission terminal of serial communication module 9 links to each other with the communications end of Single-chip Controlling unit 12.The model that the master chip of serial communication circuit 9 adopts is MAX232, and it is used for serial communication, is about to measurement data and is sent to host computer.Other compositions and annexation thereof are identical with embodiment one.
Embodiment six: referring to Fig. 3, this embodiment with the difference of concrete enforcement side mode one is: described pick-up unit also comprises temperature sensor 14 and warning circuit 15, temperature sensor 14 is used for the temperature of testing environment, guarantee that elements such as grating are operated in the temperature allowed range, the signal output part of temperature sensor 14 connects the temperature information input end of Single-chip Controlling unit 12, and the alarm signal output ends of Single-chip Controlling unit 12 connects the signal input end of warning circuit 15.Single-chip Controlling unit 12 judges that whether the temperature that temperature sensor 14 is measured surpasses threshold value, then starts warning circuit if surpass threshold value.The operating temperature range of pick-up unit of the present invention is 0 ℃～+ 40 ℃.Other compositions and annexation thereof are identical with embodiment one.
Claims (7)
1. axial free-gap of freight carrier rolling bearing and assemble high pick-up unit, it is characterized in that described pick-up unit comprises first grating displacement sensor (3), second grating displacement sensor (4), two data Acquisition Circuit (5), CPLD processing unit (6), input equipment (11), Single-chip Controlling unit (12) and LCD display (7), first grating displacement sensor (3) is used to measure the end-play of freight car rolling bearing, and the measuring head of first grating displacement sensor (3) contacts with the upper surface of bearing outer ring (2); Second grating displacement sensor (4) is used to measure the assembling height of freight car rolling bearing, and the measuring head of second grating displacement sensor (4) contacts with the upper surface of bearing inner race (1); The output terminal of first grating displacement sensor (3) connects the end-play data input pin of CPLD processing unit (6) by a data Acquisition Circuit (5), the output terminal of second grating displacement sensor (4) connects the high data input pin of assembling of CPLD processing unit (6) by another data acquisition circuit (5), the data output end of CPLD processing unit (6) connects the data input pin of Single-chip Controlling unit (12), the CPLD control signal output ends of Single-chip Controlling unit (12) connects the signal input end of CPLD processing unit (6), the demonstration output terminal of Single-chip Controlling unit (12) connects the data input pin of LCD display (7), the display control signal output terminal of Single-chip Controlling unit (12) connects the signal input end of LCD display (7), and the output terminal of input equipment (11) connects the external control signal input end of Single-chip Controlling unit (12).
2. axial free-gap of freight carrier rolling bearing according to claim 1 and assemble high pick-up unit, it is characterized in that described each data acquisition circuit (5) is by amplifying and negative circuit (5-1) and analog to digital conversion and frequency multiplier circuit (5-2) are formed, the output terminal of first grating displacement sensor (3) connects the input end of amplification and negative circuit (5-1), amplify and the output terminal connection mode number conversion of negative circuit (5-1) and the input end of frequency multiplier circuit (5-2), the output terminal of analog to digital conversion and frequency multiplier circuit (5-2) connects the end-play data input pin of CPLD processing unit (6).
3. axial free-gap of freight carrier rolling bearing according to claim 1 and assemble high pick-up unit, it is characterized in that described pick-up unit also comprises output device (8) and system clock circuit (10), the data output end of Single-chip Controlling unit (12) connects the data input pin of output device (8), the output control signal output ends of Single-chip Controlling unit (12) connects the signal input end of output device (8), and the output terminal of system clock circuit (10) connects the date signal input part of Single-chip Controlling unit (12).
4. axial free-gap of freight carrier rolling bearing according to claim 1 and assemble high pick-up unit, it is characterized in that described pick-up unit also comprises serial communication module (9), the data transmission terminal of serial communication module (9) links to each other with the communications end of Single-chip Controlling unit (12).
5. axial free-gap of freight carrier rolling bearing according to claim 1 and assemble high pick-up unit, it is characterized in that described pick-up unit also comprises temperature sensor (14) and warning circuit (15), the signal output part of temperature sensor (14) connects the temperature information input end of Single-chip Controlling unit (12), and the alarm signal output ends of Single-chip Controlling unit (12) connects the signal input end of warning circuit (15).
6. axial free-gap of freight carrier rolling bearing according to claim 2 and assemble high pick-up unit, it is characterized in that in a data Acquisition Circuit (5), it is the five segmentation frequency multiplication chips (U1) of SJ0205 that the master chip of analog to digital conversion and frequency multiplier circuit (5-2) adopts model, amplification and negative circuit (5-1) are by first operational amplifier (Q1), second operational amplifier (Q2), the 3rd operational amplifier (Q3), first resistance (R1), second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4), the 5th resistance (R5), first variable resistor (R6) and the second adjustable resistance (R7) are formed, first grating displacement sensor (3) has sin,-sin, cos, four signal output parts of-cos, the sin signal output part of first grating displacement sensor (3) connects an end of first resistance (R1) and the second adjustable resistance (R7), the other end of first resistance (R1) connects the in-phase input end of first operational amplifier (Q1), first grating displacement sensor (3)-the sin signal output part connects an end of the 3rd resistance (R3) and the other end of the second adjustable resistance (R7), the movable terminal of the second adjustable resistance (R7) is positioned at middle and connects signal ground, the other end of the 3rd resistance (R3) connects the inverting input of first operational amplifier (Q1), the output terminal of first operational amplifier (Q1) connects the sin signal input part of five segmentation frequency multiplication chips (U1) and the inverting input of the 3rd operational amplifier (Q3), the in-phase input end of the 3rd operational amplifier (Q3) connects signal ground by the 4th resistance (R4), the output terminal of the 3rd operational amplifier (Q3) connects five segmentation frequency multiplication chips (U1)-sin signal input part, the cos signal output part of first grating displacement sensor (3) connects an end of the 5th resistance (R5) and first variable resistor (R6), the other end of the 5th resistance (R5) connects the in-phase input end of second operational amplifier (Q2), first grating displacement sensor (3)-the cos signal output part connects an end of second resistance (R2) and the other end of first variable resistor (R6), the movable terminal of first variable resistor (R6) is positioned at middle and connects signal ground, the other end of second resistance (R2) connects the inverting input of second operational amplifier (Q2), and the output terminal of second operational amplifier (Q2) connects the cos signal input part of five segmentation frequency multiplication chips (U1); The O1 of five segmentation frequency multiplication chips (U1) is connected two data input ends of CPLD processing unit (6) with the O2 output terminal.
7. axial free-gap of freight carrier rolling bearing and assemble high detection method is characterized in that described method carries out as follows:
One, detect the end-play of freight car rolling bearing: earlier freight car rolling bearing is placed in test desk (13) above, bearing inner race (1) is supported by the upper surface of test desk (13), bearing outer ring (2) freely is suspended on the bearing inner race (1) owing to gravity, on the upper surface of bearing inner race (1), apply downward first acting force (F1) by pressure apparatus, bearing inner race this moment (1) is secured in a press, and the measuring head of first grating displacement sensor (3) contacts with the upper surface of bearing outer ring (2); Then, apply second acting force (F2) upwards in the bottom of bearing outer ring (2), make upwards jack-up of bearing outer ring (2), first grating displacement sensor (3) has upwards been compressed a segment distance A simultaneously, and then detected this segment distance of first grating displacement sensor (3) A is exactly the end-play of bearing;
Two, detect the assembling height of freight car rolling bearing: after bearing inner race (1) is secured in a press in as step 1, the measuring head of second grating displacement sensor (4) is contacted with the upper surface of bearing inner race (1), and second grating displacement sensor (4) moves down till can not being compressed again, second grating displacement sensor this moment (4) is in final position, at last, the final position of measuring second grating displacement sensor (4) is a with the distance of the upper surface of measuring table top (14), second grating displacement sensor (4) is compressed distance and is C, then the high h of the assembling of freight car rolling bearing calculates as follows: h=a-(B-C), wherein B is the length of measuring head under free state of second grating displacement sensor (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100100607A CN100386597C (en) | 2006-05-19 | 2006-05-19 | Apparatus for detecting axial free-gap of freight carrier rolling bearing and its fitting height, and method thereof |
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| CNB2006100100607A CN100386597C (en) | 2006-05-19 | 2006-05-19 | Apparatus for detecting axial free-gap of freight carrier rolling bearing and its fitting height, and method thereof |
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| CN1851395A CN1851395A (en) | 2006-10-25 |
| CN100386597C true CN100386597C (en) | 2008-05-07 |
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| CN104785452B (en) * | 2015-03-31 | 2017-11-28 | 芜湖文达精密机械科技有限公司 | A kind of bearing height detection means |
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| CN2470784Y (en) * | 2001-01-11 | 2002-01-09 | 万向钱潮股份有限公司 | Bearing axial play measuring instrument |
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| Publication number | Publication date |
|---|---|
| CN1851395A (en) | 2006-10-25 |
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