CN202947699U - Aerostatic measuring head mechanism of automotive wheel detection machine - Google Patents
Aerostatic measuring head mechanism of automotive wheel detection machine Download PDFInfo
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- CN202947699U CN202947699U CN 201220318137 CN201220318137U CN202947699U CN 202947699 U CN202947699 U CN 202947699U CN 201220318137 CN201220318137 CN 201220318137 CN 201220318137 U CN201220318137 U CN 201220318137U CN 202947699 U CN202947699 U CN 202947699U
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- web joint
- measuring head
- gauge head
- external member
- gas
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Abstract
The utility model brings forward an aerostatic measuring head mechanism of an automotive wheel detection machine. The aerostatic measuring head mechanism includes a measuring rod and a measuring head in a round ball shape; and the measuring head is supported by an aerostatic support mechanism connected to the measuring rod. The structure of the aerostatic support mechanism is characterized in that an external member is connected to the measuring rod; a support spherical surface of the measuring head is arranged on the external member; and a certain gap is left between the support spherical surface and the measuring head. Ventilation holes are arranged on the external member; and a plurality of small holes for throttling are arranged on the support spherical surface, wherein the small holes for throttling are symmetrically arranged and are communicated with the ventilation holes. When flowing from the ventilation holes of the external member, gas passes through the small holes for throttling and enters the gap between the support spherical surface and the measuring head, thereby forming a gas film with the certain rigidity and bearing capability; and meanwhile, the measuring head can be rotated universally on the support spherical surface. According to the utility model, on the basis of the novel structure of the aerostatic measuring head mechanism, the gas film with the certain rigidity and bearing capability is formed and the universal rotation of the measuring head on the support spherical surface is realized, thereby ensuring that the relative motion between the measuring head and a measured wheel is a pure rolling motion; and the driving force needed by the detection can be substantially reduced and the detection precision can be improved.
Description
Technical field
The utility model relates to a kind of novel head mechanism on automotive wheel detection machine, especially gas-static head mechanism.
Background technology
Automotive wheel is the important composition parts of automobile, and is directly connected to security and the comfortableness of high vehicle speeds.In the key index that automotive wheel detects, the diameter run-out of automotive wheel and the detection of axial runout are one of indexs that wherein detects.The bulk of automotive wheel axial runout and diameter run-out effective measuring point is very little, considers again detection efficiency, needs a head mechanism detect simultaneously axial runout and diameter run-out.Head mechanism can be divided into contact and contactless, due to contactless gauge head poor stability, generally selects contact measuring head mechanism on engineering.In testing process, wheel is rotation under rotary motion mechanism drives, and gauge head and tested wheel contact at the detection position, and gauge head exists the surface of both direction to move with respect to wheel, existing head mechanism generally can only guarantee to be rolling on a direction, be slip in another direction.Like this, not only gauge head easily weares and teares in testing process, need frequent replacing gauge head, and friction force also can affect measuring accuracy.Also have automotive wheel detection machine to adopt the tolling measurement wheel to detect, but can not guarantee fully that its relative motion is pure rolling, and this mechanism structure is complicated, the equipment difficulty is large.
Summary of the invention
The purpose of this utility model is to provide a kind of automotive wheel and detects machine gas-static head mechanism, can Universal rotary in testing process, guarantee that gauge head and relative motion between tested wheel are pure rolling, with the raising accuracy of detection.
For this reason, the technical solution of the utility model is as follows: automotive wheel detects machine gas-static head mechanism, comprises measuring staff, and gauge head is characterized in that: gauge head is the ball shape, and gauge head supports by the gas-static supporting mechanism that is connected on measuring staff; The structure of described gas-static supporting mechanism is: external member is connected on measuring staff, external member is provided with the support sphere of gauge head, support between sphere and gauge head and leave certain gap, external member is provided with air hole, support sphere and be provided with a plurality of symmetrically arranged throttling pore, throttling pore is communicated with air hole; Air hole when gas from the external member flows into, and enters gauge head and the gap of supporting between sphere through throttling pore, forms the air film with certain rigidity and load-bearing capacity, and this moment, gauge head can be up to ten thousand to rotation at the support sphere.
Beneficial effect: the utility model innovation structure, air hole from external member flows into, enter gauge head and support gap between sphere through throttling pore, formation has the air film of certain rigidity and load-bearing capacity, realize gauge head at the Universal rotary that supports on sphere, guarantee that gauge head and relative motion between tested wheel are pure rolling, gauge head in testing process almost without wearing and tearing, can significantly reduce and detect required driving force, improve accuracy of detection.
Description of drawings
Fig. 1 is the detection schematic diagram of the utility model gas-static head mechanism.
Fig. 2 is the front view of the utility model gas-static head mechanism.
Fig. 3 is the top plan view of the utility model gas-static head mechanism.
Fig. 4 is that the utility model gas-static head mechanism is measured the gas film pressure distribution schematic diagram of (off working state) without acceptance of persons.
Fig. 5 is the gas film pressure distribution schematic diagram that the utility model gas-static head mechanism has offset (duty).
Shown in figure: 1 is tested wheel; 2 is gauge head; 3 is shaft position sensor; 4 is radial displacement transducer; 5 is measuring staff; 6 is cross slid platform; 7,8 is bolt; 9,10 is register pin; 11,12 is clamping plate; 13 is gas-tpe fitting (totally 4); 14 is air film; 15 is throttling pore (totally 8); 16 is air hole (totally 4); A is the diameter run-out direction; B is the axial end direction of beating;
Be bleed pressure;
For gauge head is measured each throttle orifice top hole pressure without acceptance of persons;
For gauge head has each throttle orifice top hole pressure of offset right side;
For gauge head has each throttle orifice top hole pressure of offset left side;
Be environmental pressure;
For gauge head is measured radially mean gap without acceptance of persons; E is offset.
Embodiment
As shown in Figure 1, be the detection principle of the utility model gas-static head mechanism.During detection, the displacement transfer route of wheel diameter run-out is: gauge head 2 → measuring staff 5 is along A to movement → cross slid platform 6 → radial displacement transducer 4; The displacement transfer route of wheel axial runout is: gauge head 2 → measuring staff 5 is along B to movement → cross slid platform 6 → shaft position sensor 3.
automotive wheel as shown in Fig. 2,3 detects machine gas-static head mechanism, comprises measuring staff 5, gauge head 2, and gauge head 2 is the ball shape, and gauge head 2 supports by the gas-static supporting mechanism that is connected on measuring staff, the structure of described gas-static supporting mechanism is: the first web joint 11, the second web joint 12 is by the first bolt 7, the second bolt 8 and the first register pin 9, the second register pin 10 symmetries are fixed on measuring staff 5, the first web joint 11, the second web joint 12 consists of external member, the head of the first web joint 11 and the second web joint 12 is provided with ball-and-socket, two ball-and-sockets consist of the support sphere of gauge head, support between sphere and gauge head 5 and leave certain gap, the first web joint 11 and the second web joint 12 are provided with air hole 16, the ball-and-socket surface of the ball-and-socket of the first web joint 11 and the second web joint 12 is provided with a plurality of symmetrically arranged throttling pore 15, throttling pore is communicated with air hole 16, air hole when gas from the web joint flows into, and enters gauge head and the gap of supporting between sphere through throttling pore, forms the air film 14 with certain rigidity and load-bearing capacity, and this moment, gauge head can be up to ten thousand to rotation at the support sphere.The external member that the first web joint 11, the second web joint 12 consist of contains the support gauge head, bears the radial and axial load that produces in testing process.
Be respectively equipped with on four symmetrically arranged throttling pore 15, the first web joints 11 and the second web joint 12 on ball-and-socket surface on the first web joint 11 and the second web joint 12 and be respectively equipped with two air holes 16, each air hole is communicated with two throttling pore.
Load-bearing capacity and the rigidity of lower this kind of surface analysis gas-static gauge head:
In the course of the work, the gas-static gauge head will bear the load of horizontal direction and vertical direction.At first, the load on the analysis level direction.The sphere that external member is corresponding with gauge head is divided into the left and right two halves, and each hemisphere face (ball-and-socket) is θ by drift angle
1And θ
2Circular cone cut out.
With θ in Fig. 4 on each hemisphere face
04 throttle orifices have been offered on the conical surface for drift angle.
Gas can produce certain pressure from throttle orifice inflow air film and fall, namely from bleed pressure P
0Be down to the orifice pressure P
dAs shown in Figure 4, be the state of gauge head when not detecting (inoperative), gauge head is concentric with sphere, and (air-film thickness is h to the gap between them
0) equate everywhere.Minute two-way after gas flows out from throttle orifice, a road direction is interior through θ
1The circular cone inner boundary flows into atmosphere, and another road direction is outer through θ
2The circular cone outer boundary flows into atmosphere.Gaseous tension will be from the P in aperture
dBe down to atmospheric pressure P to two ends
aThe distribution of pressure as shown in Figure 4, as seen due to the symmetry of structure, (each throttle orifice top hole pressure is all the full symmetric that flows also
).So, this moment pressure to make a concerted effort be zero, namely head mechanism does not support the ability of external applied load.
As shown in Figure 5, the state when being gauge head detection (work), when along continuous straight runs produces an eccentric amount e in sphere when gauge head, the gap between gauge head (steel ball) and sphere will change.Due to the difference of air-film thickness, cause the resistance of air-flow also different.The position resistance that air-film thickness is large is little, and the little position resistance of air-film thickness is large.Thereby gas is when throttle orifice flows to the environmental area, gauge head left side resistance small flow accelerates, the stream pressure of the left side throttle orifice of flowing through is fallen become large, so throttle orifice aperture, left side pressure is compared when measuring without acceptance of persons, in various degree decline is arranged, and (each throttle orifice top hole pressure of left side is
,
＜
), thereby cause the corresponding decline (see figure 5) of pressure that air film is interior.And the right side is just opposite with the left side, and is little when measuring than without acceptance of persons due to air-film thickness, and it is large that resistance to flow becomes, and speed diminishes, and (each throttle orifice top hole pressure of right side is to make throttle orifice aperture pressure rising
,
).Thereby whole right side air film internal pressure also has the different rising (see figure 5) of degree.Because head mechanism up and down is symmetrical, be zero gaseous tension the making a concerted effort in vertical direction that acts on gauge head, and make a concerted effort in the horizontal direction be
（1）
The action direction of the W that makes a concerted effort that is calculated by following formula (1) is opposite with the moving direction of eccentric e.W is the ability of external reaction supporting external applied load out when producing eccentric e, is called load-bearing capacity.
Due to W corresponding to different e, so in the situation that supply gas pressure and flow controller are given, a corresponding relation is just arranged, namely
Following formula (2) is carried out differentiate, can obtain the rigidity of head mechanism, namely
Suppose flowing for the one dimension under Isothermal Condition flows in air film, namely gauge head right side gas film pressure distribution and expression formula is (seeing " pressurized air is lubricated " that Liu's newly-risen sun etc. is write)
（
≤
<
） （4）
（
≤
<
） （5）
The power that acts on etc. on the annular micro unit of taper angle theta projects on horizontal direction, then integration and deduct environmental pressure on corresponding surface
Impact, can obtain the gauge head right side and make a concerted effort,
（6）
When known throttle orifice outlet pressure
The time, just can utilize formula (6) to calculate gauge head right side load-bearing capacity (making a concerted effort in like manner in the left side).
Can apply mechanically the nonlinear aerostatic bearing master curve equation of solution and obtain, equation is seen formula (7),
In formula:
Expression gas passage coefficient;
Expression actuating medium coefficient;
Expression construction coefficient (concrete formula is seen " pressurized air is lubricated " that Liu's newly-risen sun etc. is write).
Be the inverse of zero dimension supply gas pressure,
β is the choke pressure ratio of throttle orifice,
The structural parameters of gauge head are: R=30mm,
,
,
, n=4, d=0.2mm,
,
, the gauge head mean gap is
Gauge head is selected annular cellular type flow controller, the load-bearing capacity of gauge head when calculating different offset, and numerical value sees Table 1.
In table 1,
With the relational expression of eccentric amount e be
,
With the relational expression of eccentric amount e be
Table 1
From table 1 and can finding out,
Be certain when value between 0.005mm to 0.010mm, gauge head rigidity is maximum.Can the data from table 1 calculate with method of interpolation.
As calculated, when the eccentric amount e on horizontal direction was 0.0159mm, on the gauge head horizontal direction, rigidity was maximum, for
Load-bearing capacity on the gauge head horizontal direction is 72.92N at this moment.
In like manner, when eccentric amount e in vertical direction was 0.0169mm, on the gauge head vertical direction, rigidity was maximum, for
Load-bearing capacity on the gauge head vertical direction is 42.65N at this moment.
Claims (3)
1. automotive wheel detects machine gas-static head mechanism, comprises measuring staff, and gauge head is characterized in that: gauge head is the ball shape, and gauge head supports by the gas-static supporting mechanism that is connected on measuring staff; The structure of described gas-static supporting mechanism is: external member is connected on measuring staff, external member is provided with the support sphere of gauge head, support between sphere and gauge head and leave certain gap, external member is provided with air hole, support sphere and be provided with a plurality of symmetrically arranged throttling pore, throttling pore is communicated with air hole; Air hole when gas from the external member flows into, and enters gauge head and the gap of supporting between sphere through throttling pore, forms the air film with certain rigidity and load-bearing capacity, and this moment, gauge head can be up to ten thousand to rotation at the support sphere.
2. automotive wheel according to claim 1 detects machine gas-static head mechanism, a kind of structure that it is characterized in that described external member: the first web joint (11), the second web joint (12) are fixed on measuring staff (5) by the first bolt (7), the second bolt (8) and the first register pin (9), the second register pin (10) symmetry, and the first web joint (11), the second web joint (12) consist of external member; The head of the first web joint (11) and the second web joint (12) is provided with ball-and-socket, two ball-and-sockets consist of the support sphere of gauge head, the first web joint (11) and the second web joint (12) are provided with air hole (16), the ball-and-socket surface of the ball-and-socket of the first web joint (11) and the second web joint (12) is provided with a plurality of symmetrically arranged throttling pore (15), and throttling pore is communicated with air hole (16).
3. automotive wheel according to claim 2 detects machine gas-static head mechanism, it is characterized in that: be respectively equipped with four symmetrically arranged throttling pore (15) on the ball-and-socket surface on described the first web joint (11) and the second web joint (12), be respectively equipped with two air holes (16) on the first web joint (11) and the second web joint (12), each air hole is communicated with two throttling pore.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220318137 CN202947699U (en) | 2012-07-03 | 2012-07-03 | Aerostatic measuring head mechanism of automotive wheel detection machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220318137 CN202947699U (en) | 2012-07-03 | 2012-07-03 | Aerostatic measuring head mechanism of automotive wheel detection machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202947699U true CN202947699U (en) | 2013-05-22 |
Family
ID=48423397
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220318137 Expired - Fee Related CN202947699U (en) | 2012-07-03 | 2012-07-03 | Aerostatic measuring head mechanism of automotive wheel detection machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202947699U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102759335A (en) * | 2012-07-03 | 2012-10-31 | 湖北汽车工业学院 | Gas static pressure measuring head mechanism for car wheel detector |
-
2012
- 2012-07-03 CN CN 201220318137 patent/CN202947699U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102759335A (en) * | 2012-07-03 | 2012-10-31 | 湖北汽车工业学院 | Gas static pressure measuring head mechanism for car wheel detector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130522 Termination date: 20150703 |
|
| EXPY | Termination of patent right or utility model |