CN106225739A - A kind of Pneumatic measuring head measuring high accuracy hemisphere sphere diameter - Google Patents
A kind of Pneumatic measuring head measuring high accuracy hemisphere sphere diameter Download PDFInfo
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- CN106225739A CN106225739A CN201610787432.0A CN201610787432A CN106225739A CN 106225739 A CN106225739 A CN 106225739A CN 201610787432 A CN201610787432 A CN 201610787432A CN 106225739 A CN106225739 A CN 106225739A
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- socket
- hemisphere
- standard ball
- air inlet
- sphere diameter
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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
- G01B13/00—Measuring arrangements characterised by the use of fluids
- G01B13/08—Measuring arrangements characterised by the use of fluids for measuring diameters
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- General Physics & Mathematics (AREA)
- Measuring Arrangements Characterized By The Use Of Fluids (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The present invention relates to a kind of Pneumatic measuring head measuring high accuracy hemisphere sphere diameter, including measuring head body, measure head body be provided with for hemisphere corresponding matching to be measured the standard ball-and-socket that forms earial drainage gap, standard ball-and-socket is provided with the air inlet for supplying gas to the earial drainage gap between hemisphere to be measured and standard ball-and-socket, air inlet has the air inlet towards described hemisphere to be measured, being provided with vent grooves in the Internal Spherical Surface of standard ball-and-socket, the air inlet of described air inlet is arranged on the bottom land of described vent grooves.It is provided with standard ball-and-socket owing to measuring head body, by standard ball-and-socket and corresponding matching to be measured and form earial drainage gap, is supplied gas in earial drainage gap by the air inlet on standard ball-and-socket, it is achieved the pneumatic gauging to hemisphere sphere diameter to be measured.Metering system is simple, easy to operate, measures efficiency high, and the time of measuring is short, and repeatability is high, and survey bureau is sex-limited little, measures abrasion little, even without abrasion.
Description
Technical field
The present invention relates to a kind of Pneumatic measuring head measuring high accuracy hemisphere sphere diameter.
Background technology
Gyro machine is applied to space flight, aviation, navigation equipment flight attitude and heading control loop, and its precision directly affects
To the precision of posture control system, and bearing is the core component of gyro machine, the accuracy of manufacture of bearing and the direct shadow of assembly precision
Ring to the precision of gyro machine, life-span and reliability.Along with the posture control system raising to bearing required precision, gas dynamic pressure formula top
The application of spiral shell motor bearings is more and more extensive, and dome-type aero dynamic bearing is exactly one therein.For meeting gyro machine bearing
Bearing capacity and rigidity, dome-type aero dynamic bearing air film gap is only several microns, therefore it is required that spherical face roughness,
Steradian and spheroid diameter difference are submicron order, and spheroid diameter difference directly affects the performance of dome-type aero dynamic bearing, and hemisphere sphere diameter
Accurately measure most important.For many years, the hemisphere spherical diameter measurement method of dome-type aero dynamic bearing mainly has two kinds, a kind of
Measuring method be hemisphere is fitted in standard sphere diameter ball-and-socket together with, by measuring hemisphere and the end-play of ball-and-socket and axial play
Gap calculates the sphere diameter of hemisphere indirectly；Another kind of measuring method is optical interferometry, and hemisphere is placed on the organic glass of standard sphere diameter
In glass ball-and-socket, measure the sphere diameter of hemisphere by observing interference of light striped.First method weak point is: hemisphere and ball-and-socket group
When fitting over together, hemisphere and ball-and-socket should be through strictly cleaning, it is desirable to assemble environment high, therefore efficiency is the lowest, measurement cost is high, measurement
Time is long, and can only measure the hemisphere less than ball-and-socket sphere diameter, so measuring method limitation is bigger；Second method is not enough
Part is: owing to sphere deviation from circular from can reflect in interference fringe, therefore causes the relatively low and the least dust of certainty of measurement ratio
Measurement will be caused invalid, therefore the repeatability ratio of certainty of measurement is relatively low.
Prior art also has and utilizes existing pneumatic gauging technology to realize the accurate measurement to hemisphere sphere diameter, pneumatic gauging
Technology needs to use pneumatic measuring instrument, pneumatic measuring instrument be in machine building industry use a kind of new type measuring instrument, it be by
The variable quantity of workpiece size is converted to the change of compressed-air actuated flow or pressure, is then indicated by instruction device, thus
Measure the scale error of workpiece size.Pneumatic gauging technology is that quilt is reacted in the change of the flow and pressure by measuring gas
Surveying the technology of accessory size, physical principle is as follows: the flow of gas becomes ratio with pressure with the size in the gap of gas earial drainage
Example relation, is in inversely prroportional relationship simultaneously between pressure and flow.The compressed air after pressure regulation tune in pneumatic measuring instrument
Obtain, at the nozzle of Pneumatic measuring head, if nozzle is facing to air, there is no blocking object at nozzle, it will have max-flow after joint valve
The gas of amount is by nozzle, now, there is a minimum pressure, when making obstacle from as far as closely leaning between regulation valve and nozzle
During nearly nozzle, the gas of ejection is owing to being stopped, flow will be along with reduction, and pressure can gradually rise simultaneously, when nozzle quilt
After blocking completely, flow is zero, and pressure will rise to maximum.Distance definition between prize obstacle and nozzle is earial drainage gap, sick
The above-mentioned change procedure of root makes flow-earial drainage gap and the curve chart in pressure-earial drainage gap, it can be seen that except pressure
Power and flow and initial and saturation stage, other parts at two curved sections be all straight line, i.e. flow with earial drainage gap one
In the range of fixed gap linear, pressure and earial drainage gap are the most linear in certain earial drainage interstice coverage.Such one
Come, corresponding measurement earial drainage interval can be carried out by measuring flow or pressure.
A kind of symmetrical expression ball-and-socket ball is disclosed in the Chinese invention patent application that application publication number is CN104848810A
Footpath pneumoelectric measuring instrument, this measuring instrument i.e. uses pneumatic gauging commercial measurement ball-and-socket sphere diameter, and pneumoelectric measuring instrument includes pneumoelectric electronics
Post and the Pneumatic measuring head of tested ball-and-socket Corresponding matching and the calibrating device group with Pneumatic measuring head Corresponding matching, pneumatic gauging
Head is spheroid form, is provided with the gas passage with two gas delivery ports, gas passage and pneumoelectric electronics on Pneumatic measuring head
The gas output end of post is connected, in the upper and lower surface of the spheroid that two gas delivery ports are positioned at Pneumatic measuring head one to one, from
And forming top nozzle and lower nozzle, the gas with certain pressure exported from the gas output end of pneumoelectric electron beam leads to through gas
Spray from upper and lower nozzle behind road, during use, Pneumatic measuring head be placed in symmetrical expression ball-and-socket, the gas of band certain pressure respectively from
Between earial drainage gap and lower nozzle and the lower nest wall of symmetrical expression ball-and-socket between top nozzle and the upper nest wall of symmetrical expression ball-and-socket
Earial drainage gap is to outer nozzle earial drainage, by measuring gas flow or the pressure of the gas output end output of pneumoelectric electron beam,
Obtain the size in earial drainage gap according to corresponding linear relationship, and then obtain the sphere diameter of symmetrical expression ball-and-socket according to spheroid sphere diameter.
But the Pneumatic measuring head in above-mentioned sphere diameter pneumoelectric measuring instrument is spherical structure, is simply possible to use in and surveys ball-and-socket radius
Amount, it is impossible to hemisphere sphere diameter is carried out pneumatic gauging.And, two nozzles on above-mentioned Pneumatic measuring head are set directly at outside spheroid
Base on sphere, when Pneumatic measuring head is placed in symmetrical expression ball-and-socket, between Pneumatic measuring head and symmetrical expression ball-and-socket to be measured
There is the contact of linear contact lay dough-making powder in plinth, and the position of these linear contact lay dough-making powder contact cannot determine in advance, and the position of upper and lower nozzle
The most fixing is opened on Pneumatic measuring head, for avoiding the position of these linear contact lay or face contact to cause upper and lower nozzle
Block and affect normal measurement, need repeatedly to adjust the position of Pneumatic measuring head, so, not only measure inefficient,
And Pneumatic measuring head and ball-and-socket to be measured also can be caused additional wear by adjustment repeatedly, reduce the use longevity of Pneumatic measuring head
Life, affects the precision of ball-and-socket to be measured.Further, due to the earial drainage gap between ball-and-socket and spheroid uncertain, it is directly arranged in ectosphere
When nozzle on face is inflated to earial drainage gap, stability is bad, and then can affect the measurement of gas flow and pressure, and impact is measured
Precision.
Summary of the invention
The present invention provides a kind of Pneumatic measuring head measuring high accuracy hemisphere sphere diameter for measuring hemisphere sphere diameter.
The technical scheme of the Pneumatic measuring head measuring high accuracy hemisphere sphere diameter provided by the present invention is: a kind of measurement is high-precision
Degree hemisphere sphere diameter Pneumatic measuring head, including measure head body, measure head body be provided with for hemisphere corresponding matching to be measured
And forming the standard ball-and-socket in earial drainage gap, standard ball-and-socket is provided with for the earial drainage gap between hemisphere to be measured and standard ball-and-socket
The air inlet supplied gas, air inlet has the air inlet towards described hemisphere to be measured, is provided with ventilation in the Internal Spherical Surface of standard ball-and-socket
Groove, the air inlet of described air inlet is arranged on the bottom land of described vent grooves.
Described vent grooves extends along the warp bearing of trend of the Internal Spherical Surface of described standard ball-and-socket.
At least one end of described vent grooves is the hatch frame of the end face edge extending to standard ball-and-socket.
Described vent grooves is U-type groove structure.
Described vent grooves and air inlet are evenly equipped with two or more along described the circumferentially-spaced of standard ball-and-socket.
It is provided with, at the bottom of the nest of described standard ball-and-socket, the steam vent connected for described vent grooves.
The Internal Spherical Surface of the nest bottom of described standard ball-and-socket is provided with the exhaust groove connected with described vent grooves, aerofluxus
Hole has the inner aperture towards hemisphere to be measured, and the inner aperture of steam vent is arranged on the cell wall of described exhaust groove.
The invention has the beneficial effects as follows: the Pneumatic measuring head measuring high accuracy hemisphere sphere diameter provided by the present invention is using
Time, it is provided with standard ball-and-socket owing to measuring head body, by standard ball-and-socket and corresponding matching to be measured and form earial drainage gap, by mark
Air inlet on quasi-ball-and-socket is supplied gas in earial drainage gap, it is achieved the pneumatic gauging to hemisphere sphere diameter to be measured.Metering system is simple, behaviour
Facilitating, measure efficiency high, the time of measuring is short, and repeatability is high, and survey bureau is sex-limited little, measures abrasion little, even without abrasion.And
And, owing to the air inlet of air inlet is arranged on the bottom land of the vent grooves that the Internal Spherical Surface of standard ball-and-socket is provided with, when standard ball-and-socket
When contacting with hemisphere generation linear contact lay to be measured or face, can farthest reduce contact portion blocking air inlet and affect air inlet
The probability that hole normally works, when assembling Pneumatic measuring head with tested hemisphere, it is not necessary to repeatedly adjusts and can directly survey
Amount, can be effectively improved measurement efficiency, reduces the contact site impact on measuring.And, air inlet is arranged on the groove of vent grooves
The end, the air-flow discharged at air inlet is the most stable, and then can improve certainty of measurement.
Further, vent grooves extends along the warp bearing of trend of the Internal Spherical Surface of standard ball-and-socket, it is simple to arrange through air inlet
The gas gone out quickly enters in the earial drainage gap that hemisphere to be measured and standard ball-and-socket are formed.
Further, the two ends of vent grooves are hatch frame, it is simple to gas earial drainage, prevent from forming sealing cavity and inciting somebody to action half
Ball struts with standard ball-and-socket, it is ensured that certainty of measurement.
Further, vent grooves is U-type groove structure, and U-type groove construction standard is stable, and structure is easy to design and produce.
Further, standard ball-and-socket arranges steam vent, it is simple to discharged by the gas in earial drainage gap, it is to avoid to be measured
Form annular seal space between hemisphere and standard ball-and-socket and have influence on the normal measurement to hemisphere sphere diameter.
Further, the aperture, outer end of steam vent is arranged in exhaust groove, it is to avoid localized contact closure steam vent.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing high accuracy hemisphere；
Fig. 2 is that the structure for a kind of embodiment of the Pneumatic measuring head measuring high accuracy hemisphere sphere diameter provided by the present invention is shown
It is intended to；
Fig. 3 is the schematic diagram during sphere diameter of the high accuracy hemisphere using Pneumatic measuring head as shown in Figure 2 to measure as shown in Figure 1.
Detailed description of the invention
As shown in Figure 1 to Figure 3, the embodiment of a kind of Pneumatic measuring head measuring high accuracy hemisphere sphere diameter, including measuring head
Body 300, measure the side of head body 300 be concavely provided with for hemisphere 100 corresponding matching to be measured form earial drainage gap 200
Standard ball-and-socket, the structure of hemisphere to be measured sees Fig. 1, and it is provided with the semiglobe of frustal plane, half ball center to be measured for top
Central through hole it is provided with at axial location.Standard ball-and-socket is provided with for the earial drainage between hemisphere 100 to be measured and standard ball-and-socket
The air inlet supplied gas in gap 200, air inlet herein includes the first air inlet 1 and the second air inlet 6, and two air inlets are along standard ball
Nest circumferentially-spaced uniform, two air inlets are respectively provided with the air inlet towards hemisphere to be measured.The Internal Spherical Surface 4 of standard ball-and-socket sets
Having corresponding two air inlets to be correspondingly provided with two circumferentially-spaced uniform vent grooves along standard ball-and-socket, two vent grooves are U
Type groove structure, two vent grooves are first vent grooves 2 corresponding with the first air inlet 1 and corresponding with the second air inlet 6
Two vent grooves 5, the air inlet of the first air inlet 1 is arranged on the bottom land of the first vent grooves 2, and the air inlet of the second air inlet 6
Mouth is arranged on the bottom land position of the second vent grooves 5.
Two vent grooves all extend along the warp bearing of trend of the Internal Spherical Surface 4 of standard ball-and-socket.The upper end of two vent grooves is
Extend to the hatch frame of the edge, upper surface of standard ball-and-socket.
In the present embodiment, at the bottom of the nest of standard ball-and-socket, it is provided with the steam vent 3 for connecting with vent grooves, and, standard
The Internal Spherical Surface of the nest bottom of ball-and-socket is provided with the exhaust groove 7 connected with two vent grooves, and steam vent 3 has towards hemisphere to be measured
Inner aperture, the inner aperture of steam vent 3 is arranged on the cell wall of exhaust groove 7.
During measurement, hemisphere to be measured is positioned in the standard ball-and-socket of Pneumatic measuring head, and compressed air is connected to standard
In two air inlets of ball-and-socket, inflate in earial drainage gap 200, when the sphere diameter of hemisphere 100 to be measured differs bigger with the sphere diameter of standard
Time, earial drainage gap is relatively large, and compressed air earial drainage is more, and flow is bigger.And work as sphere diameter and the standard ball-and-socket of hemisphere to be measured
When sphere diameter difference is less, earial drainage gap is relatively small, and compressed air earial drainage is less, and flow is less.
By the flow L of measuring instrument observation inflow two air inlets such as flow valve, and the sphere diameter of hemisphere to be measured and standard ball
The spheroid diameter difference of nest is converted to compressed-air actuated flow, draws hemisphere to be measured and standard ball by measuring compressed-air actuated flow
The spheroid diameter difference of nest, owing to the sphere diameter of standard ball-and-socket is known, therefore the sphere diameter that can calculate hemisphere to be measured is.
Compressed-air actuated flow has relation, when width and the degree of depth of U-type groove with the width of U-type groove, the degree of depth and spheroid diameter difference etc.
One timing, spheroid diameter difference exists with compressed-air actuated flow, owing to width and the degree of depth of U-type groove always exist in actual manufacture process
During certain foozle, and actual size cannot truly record, and historical facts or anecdotes border handling function relation can be by having in advance
The test of limit time determines.
The vent grooves on standard ball-and-socket that the present embodiment is provided is U-type groove structure, in other embodiments, ventilates recessed
Groove can also be V-groove or rectangular groove structure.
In the present embodiment, vent grooves all extends along the warp bearing of trend of ball, so facilitates implementation compression sky
The earial drainage of gas, it is to avoid closed cavity occurs.
In the present embodiment, standard ball-and-socket is not provided only with air inlet, is additionally provided with steam vent.In other embodiments,
Can also Pneumatic measuring head provided in prior art be the same only arranges air inlet.
Claims (7)
1. measure a Pneumatic measuring head for high accuracy hemisphere sphere diameter, including measuring head body, it is characterised in that: measure head body
Be provided with for hemisphere corresponding matching to be measured the standard ball-and-socket that forms earial drainage gap, standard ball-and-socket is provided with for to be measured
The air inlet supplied gas in earial drainage gap between hemisphere and standard ball-and-socket, air inlet has the air inlet towards described hemisphere to be measured,
Being provided with vent grooves in the Internal Spherical Surface of standard ball-and-socket, the air inlet of described air inlet is arranged on the bottom land of described vent grooves.
The Pneumatic measuring head measuring high accuracy hemisphere sphere diameter the most according to claim 1, it is characterised in that: described ventilation
Groove extends along the warp bearing of trend of the Internal Spherical Surface of described standard ball-and-socket.
The Pneumatic measuring head measuring high accuracy hemisphere sphere diameter the most according to claim 2, it is characterised in that: described ventilation
At least one end of groove is the hatch frame of the end face edge extending to standard ball-and-socket.
The Pneumatic measuring head measuring high accuracy hemisphere sphere diameter the most according to claim 3, it is characterised in that: described ventilation
Groove is U-type groove structure.
The Pneumatic measuring head measuring high accuracy hemisphere sphere diameter the most according to any one of claim 1 to 4, its feature exists
In: described vent grooves and air inlet are evenly equipped with two or more along described the circumferentially-spaced of standard ball-and-socket.
The Pneumatic measuring head measuring high accuracy hemisphere sphere diameter the most according to any one of claim 1 to 4, its feature exists
In: be provided with at the bottom of the nest of described standard ball-and-socket connect for the earial drainage gap formed with standard ball-and-socket with hemisphere to be measured for
The steam vent discharged for the gas in earial drainage gap.
The Pneumatic measuring head measuring high accuracy hemisphere sphere diameter the most according to claim 6, it is characterised in that: described standard
The Internal Spherical Surface of the nest bottom of ball-and-socket is provided with the exhaust groove connected with described vent grooves, and steam vent has towards hemisphere to be measured
Inner aperture, the inner aperture of steam vent is arranged on the cell wall of described exhaust groove.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610787432.0A CN106225739B (en) | 2016-08-31 | 2016-08-31 | A kind of Pneumatic measuring head measuring high-precision hemisphere sphere diameter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610787432.0A CN106225739B (en) | 2016-08-31 | 2016-08-31 | A kind of Pneumatic measuring head measuring high-precision hemisphere sphere diameter |
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| CN106225739B CN106225739B (en) | 2019-05-31 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107764214A (en) * | 2017-11-17 | 2018-03-06 | 宁波慈兴轴承有限公司 | A kind of flexible bearing outside diameter measuring fixture and its method of work |
| CN109141212A (en) * | 2018-10-31 | 2019-01-04 | 南京新尼亚文汽车零部件有限公司 | A kind of symmetrical expression ball-and-socket sphere diameter hub pneumoelectric measuring instrument |
| CN110715624A (en) * | 2019-10-24 | 2020-01-21 | 重庆美心翼申机械股份有限公司 | Detection tool and detection method for pneumatically detecting taper angle |
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| SU1486787A1 (en) * | 1987-10-16 | 1989-06-15 | Aleksandr F Korneev | Pneumatic method of determining radius of spheric surface |
| CN1995910A (en) * | 2006-11-17 | 2007-07-11 | 南昌大学 | High-accuracy sphericity pneumatic measuring system |
| CN200979405Y (en) * | 2006-10-30 | 2007-11-21 | 南昌大学 | A high precision sphericity pneumatic gauge |
| CN203518960U (en) * | 2013-09-26 | 2014-04-02 | 三门峡中测量仪有限公司 | Scratch-proof pneumatic connecting rod measuring instrument |
| CN104848810A (en) * | 2015-04-29 | 2015-08-19 | 张家港海太精密量仪科技有限公司 | Ball diameter electro-pneumatic measuring instrument for symmetric ball socket |
| CN105004288A (en) * | 2015-07-22 | 2015-10-28 | 郑州中量测控科技有限公司 | Pneumatic internal-diameter measurement device |
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2016
- 2016-08-31 CN CN201610787432.0A patent/CN106225739B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1486787A1 (en) * | 1987-10-16 | 1989-06-15 | Aleksandr F Korneev | Pneumatic method of determining radius of spheric surface |
| CN200979405Y (en) * | 2006-10-30 | 2007-11-21 | 南昌大学 | A high precision sphericity pneumatic gauge |
| CN1995910A (en) * | 2006-11-17 | 2007-07-11 | 南昌大学 | High-accuracy sphericity pneumatic measuring system |
| CN203518960U (en) * | 2013-09-26 | 2014-04-02 | 三门峡中测量仪有限公司 | Scratch-proof pneumatic connecting rod measuring instrument |
| CN104848810A (en) * | 2015-04-29 | 2015-08-19 | 张家港海太精密量仪科技有限公司 | Ball diameter electro-pneumatic measuring instrument for symmetric ball socket |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107764214A (en) * | 2017-11-17 | 2018-03-06 | 宁波慈兴轴承有限公司 | A kind of flexible bearing outside diameter measuring fixture and its method of work |
| CN109141212A (en) * | 2018-10-31 | 2019-01-04 | 南京新尼亚文汽车零部件有限公司 | A kind of symmetrical expression ball-and-socket sphere diameter hub pneumoelectric measuring instrument |
| CN110715624A (en) * | 2019-10-24 | 2020-01-21 | 重庆美心翼申机械股份有限公司 | Detection tool and detection method for pneumatically detecting taper angle |
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| CN106225739B (en) | 2019-05-31 |
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Effective date of registration: 20180514 Address after: 471000 No. 1 axis research road, Jianxi science and Technology Industrial Park, Luoyang, Henan Applicant after: Luoyang Bearing Research Institute Address before: 471039 Fenghua Road 6, hi tech Development Zone, Luoyang, Henan. Applicant before: Zhouyan Science and Technology Co., Ltd., Luoyang |
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