CN114659484A - Leveling type wheel positioning measuring instrument and portable brake performance tester calibrating device - Google Patents

Leveling type wheel positioning measuring instrument and portable brake performance tester calibrating device Download PDF

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Publication number
CN114659484A
CN114659484A CN202210257861.2A CN202210257861A CN114659484A CN 114659484 A CN114659484 A CN 114659484A CN 202210257861 A CN202210257861 A CN 202210257861A CN 114659484 A CN114659484 A CN 114659484A
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leveling
performance tester
rotating shaft
portable
measuring instrument
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高德成
罗新元
杨峻涛
高德勇
郑礼
蒋维栋
吴九牛
何银霞
宋雨谦
魏晨凯
蒲庆云
罗滕科
张统通
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GANSU INSTITUTE OF METROLOGY
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GANSU INSTITUTE OF METROLOGY
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/22—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes
    • 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
    • G01B21/04—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 by measuring coordinates of points
    • G01B21/042—Calibration or calibration artifacts
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M17/00—Testing of vehicles
    • G01M17/007—Wheeled or endless-tracked vehicles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M17/00—Testing of vehicles
    • G01M17/007—Wheeled or endless-tracked vehicles
    • G01M17/013—Wheels

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  • General Physics & Mathematics (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)

Abstract

The invention relates to a calibrating device, in particular to a leveling type wheel alignment measuring instrument and a portable braking performance tester calibrating device. The utility model provides a level formula wheel alignment measuring apparatu, portable braking capability test appearance calibrating device, includes the base, vertical in frame on the base, set up in pivot in the frame, connect in epaxial detection revolving stage, be used for the drive the rotatory drive arrangement of pivot, set up in epaxial angle encoder, with the detection display system that the angle encoder electricity links. The invention adopts a bidirectional (transverse and longitudinal) fixed detection platform as a bearing mechanism of the measuring instrument and the tester, and the rotation angle of the rotating mechanism is detected through the angle encoder and the detection display system, so that the leveling type wheel positioning measuring instrument and the portable brake performance tester are quickly and accurately calibrated.

Description

Leveling type wheel positioning measuring instrument and portable brake performance tester calibrating device
Technical Field
The invention relates to a calibrating device, in particular to a leveling type wheel alignment measuring instrument and a portable braking performance tester calibrating device.
Background
The positioning parameters of the steering wheel (generally the front wheel) of the automobile comprise a wheel camber angle, a kingpin caster angle, a kingpin inclination angle and the like, and the correctness of the camber angle, the caster angle, the kingpin inclination angle and the like directly influences the safe operation of the automobile (strictly confirmed during the design of the automobile). Due to long-term use, incorrect operation during driving, certain external influence and the like of the automobile, the positioning parameters are changed frequently, and deviate from the original design requirements, so that the automobile is very dangerous. Therefore, the positioning parameters of the steering wheel need to be detected frequently, and the main method is to adopt a leveling wheel positioning measuring instrument to detect. According to the regulation of JJF 1377-2012 'calibration standard of leveling type wheel alignment measuring instrument', the technical indexes of the leveling type wheel alignment measuring instrument with a 'leveling instrument': the indication errors of the camber angle, the caster angle of the kingpin and the caster angle of the kingpin are plus or minus 0.5 degrees or plus or minus 5 percent; the indication error of the standard device used for calibrating the level type wheel alignment measuring instrument does not exceed +/-3'. However, no special instrument and equipment for measuring and calibrating the measuring performance of the leveling wheel alignment measuring instrument is developed at home, so that the calibration work of the leveling wheel alignment measuring instrument is difficult to implement.
In addition, the national standard GB21861-2014 "project and method for inspecting safety and technical performance of motor vehicles" is mandatory, a portable brake performance tester should be used to perform a road test for a vehicle in question during vehicle safety inspection, and the calibration of the portable brake performance tester should be performed according to the JJF 1168-2007 "calibration standard for portable brake performance tester", and the JJF 1168-2007 "calibration standard for portable brake performance tester" stipulates: the calibration of the portable brake performance tester is divided into two parts of static calibration and dynamic calibration, wherein a standard device used for the static calibration, namely a static calibration device with a calibration platform, has a rotation range of not less than 0-180 degrees; the angle resolution is not more than 0.1 degree; the error of the angle indication value does not exceed +/-0.2 deg.
At present, a leveling wheel alignment measuring instrument is calibrated after general length (angle) measuring instruments are mainly combined, and a temporarily combined calibrating device is complex in assembly, poor in reliability and difficult to guarantee repeatability; the portable brake performance tester has the advantages that the number of instruments or devices for statically calibrating the portable brake performance tester in the market is large, the number of instruments and devices is eight, the accuracy is low in various seasons, and the portable brake performance tester can only be used for single calibration of the portable brake performance tester.
Disclosure of Invention
The invention aims to provide a calibrating device for calibrating a horizontal wheel alignment measuring instrument and a portable braking performance tester aiming at the problems in the prior art.
The specific technical scheme of the invention is as follows:
a leveling type wheel alignment measuring instrument and a portable brake performance tester calibrating device comprise a base, a rack vertical to the base, a rotating shaft arranged on the rack, a detection rotary table connected to the rotating shaft, a driving device used for driving the rotating shaft to rotate, an angle encoder arranged on the rotating shaft, and a detection display system electrically connected with the angle encoder;
the detection rotary table is formed by connecting a longitudinal plate vertical to a horizontal plane and a transverse plate parallel to the horizontal plane, the rotating shaft is parallel to the horizontal plane, and the longitudinal plate is vertically connected with the rotating shaft;
furthermore, the detection display system comprises a single chip microcomputer, an angle encoder electrically connected with the single chip microcomputer, a reset chip, a memory, a keyboard scanning matrix, an LED display dynamic scanning driving circuit, a line filter and a switching power supply;
furthermore, the driving device comprises a worm wheel arranged on the rotating shaft and a hand wheel arranged on the rack, wherein a worm is arranged on a hand wheel shaft of the hand wheel, and the worm wheel is meshed with the worm;
furthermore, a fixing device is arranged on the detection rotary table, the fixing device comprises a stud vertically arranged on the transverse plate and a pressing plate sleeved on the stud, and the pressing plate can move along the axial direction of the stud;
further, the angle encoder is an incremental angle encoder;
furthermore, the bottom of the base is provided with telescopic support legs.
The operating principle of the horizontal wheel alignment measuring instrument is as follows:
the leveling type wheel alignment measuring instrument is composed of a leveling instrument A, a leveling instrument B, a leveling instrument C and a leveling instrument D. Wherein the leveling device A is used for measuring the camber angle alpha of the wheel, and the measuring range is-5 degrees to +5 degrees; the leveling device B is used for measuring the caster angle gamma of the wheel rotating main pin, and the measuring range is-3 degrees to +11 degrees; the leveling device C is used for measuring the wheel rotation kingpin inclination angle beta, the measuring range is 0-16 degrees, and the leveling device D is a basic leveling device of the whole leveling type wheel alignment measuring device; the chassis of the horizontal wheel alignment measuring instrument is provided with a magnetic suction seat which is used for being adsorbed on the hub surface of a wheel to measure the relative alignment angle of the wheel.
The working principle of the portable brake performance tester is as follows:
the measuring element of the portable brake performance tester is an acceleration (deceleration) speed sensor. In order to verify the accuracy of the portable brake performance tester, a standard "add (subtract) velocity measurement" is necessary, and one of the most basic, standard add (subtract) velocities is "gravitational acceleration". Therefore, the portable braking performance tester sensor obtains different acceleration values by using the change of the included angle between the acceleration (deceleration) axis of the portable braking performance tester sensor and the earth plumb line.
The invention has the following beneficial effects:
at present, no instrument or device special for calibrating the leveling wheel alignment measuring instrument exists in China, the instrument or device is generally combined by adopting general length (angle) measuring instruments for calibration, and a temporarily combined calibration device is complicated, poor in reliability and difficult to guarantee in repeatability.
The static calibration of the portable brake performance tester has many instruments or devices, and the accuracy is generally low in various seasons due to the fact that the instruments or devices are various, and the static calibration can only be used for single calibration of the portable brake performance tester.
At present, instrument equipment or devices which can calibrate a leveling type wheel alignment measuring instrument and a portable braking performance tester are not available in China; the invention adopts a bidirectional (transverse and longitudinal) fixed detection platform as a bearing mechanism of a measuring instrument and a tester, and the rotation angle of the rotating mechanism is detected through an angle encoder and a detection display system, so that the leveling type wheel positioning measuring instrument and the portable brake performance tester are quickly calibrated; after the calibration device is developed successfully, the calibration device can be used for multiple purposes on the premise of ensuring high calibration accuracy, and the calibration of the two instruments is convenient, economic and reasonable by a metering department.
At present, a motor vehicle detection line in the traffic field is on line in a large quantity in China like a spring bamboo shoot after rain, and the system device is developed, so that the accuracy and the reliability of the detection of the technical index value of the safety performance of the motor vehicle can be guaranteed, the safety performance of the motor vehicle in China can be guaranteed, the sustainable development of the social economy in China can be promoted, the competitiveness of the related automobile industry in China can be improved, and good economic benefit, social benefit and ecological benefit can be achieved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a block diagram of a display system according to the present invention;
FIG. 3 is a schematic view of the leveling instrument C of the leveling instrument according to the present invention;
FIG. 4 is a schematic view of the leveling device A, B of the leveling device for wheel alignment according to the present invention;
fig. 5 is a schematic structural view of the leveling wheel alignment measuring instrument.
Detailed Description
The leveling wheel alignment measuring instrument and the portable brake performance tester calibrating device shown in fig. 1 and fig. 2 comprise a base 1, a frame 2 vertical to the base 1, a rotating shaft 3 arranged on the frame 2, a detection turntable 4 connected to the rotating shaft 3, a driving device 5 for driving the rotating shaft 3 to rotate, an angle encoder 6 arranged on the rotating shaft 3, and a detection display system 7 electrically connected with the angle encoder 6; the detection rotary table 4 is formed by connecting a longitudinal plate 4-1 vertical to the horizontal plane and a transverse plate 4-2 parallel to the horizontal plane; the rotating shaft 3 is parallel to a horizontal plane; the longitudinal plate 4-1 is vertically connected with the rotating shaft 3; the detection display system comprises a singlechip 7-1, a reset chip 7-2 electrically connected with the singlechip 7-1, a memory 7-3, a keyboard scanning matrix 7-4, an LED display dynamic scanning drive circuit 7-5, a line filter 7-6 and a switching power supply 7-7; the angle encoder 6 is electrically connected with the singlechip 7-1; the driving device 5 comprises a turbine 5-1 arranged on the rotating shaft 3 and a hand wheel 5-2 arranged on the frame 2; a worm 5-3 is arranged on a hand wheel shaft of the hand wheel 5-2, and the turbine 5-1 is meshed with the worm 5-3; the detection rotary table 4 is provided with a fixing device 8, the fixing device 8 comprises a stud 8-1 vertically arranged on the transverse plate 4-2 and a pressing plate 8-2 sleeved on the stud 8-1, and the pressing plate 8-2 can move along the axial direction of the stud 8-1; the angle encoder 6 is an incremental angle encoder; the bottom of the base 1 is provided with telescopic supporting legs 9.
Example 1
As shown in fig. 3 and 5, when the leveling device C of the leveling wheel alignment measuring instrument 10 is calibrated by using the device of the present invention, the base 1 of the device of the present invention is placed on a flat hard platform, the adjusting knobs of the retractable legs 9 at the bottom of the device of the present invention are rotated to keep the device of the present invention in a horizontal state relative to the ground, and the magnetic suction base at the bottom of the leveling wheel alignment measuring instrument 10 is attached to the vertical plate 4-1 and is coaxial with the rotating shaft 3. The leveling device C of the leveling wheel alignment measuring instrument 10 is calibrated by the following specific steps:
a) a hand wheel 5-2 of a driving device 5 is rotated to drive a detection rotary table 4 to rotate along a rotating shaft 3, and the detection rotary table 4 drives a leveling type wheel alignment measuring instrument 10 to rotate, so that a bubble of a leveling measurer D of the leveling type wheel alignment measuring instrument 10 is in a horizontal middle position;
b) adjusting an inclination angle adjusting screw of the leveling instrument C to enable one end of a bubble of the leveling instrument C to be aligned with a scribed line of the leveling instrument C by 0 degrees, and setting the value of a detection display system 7 to be zero;
c) a hand wheel 5-2 of a driving device 5 is rotated to drive a detection rotary table 4 to rotate along a rotating shaft 3, and a longitudinal plate 4-1 of the detection rotary table 4 drives a leveling wheel alignment measuring instrument 10 to rotate;
d) during the rotation process of the leveling type wheel alignment measuring instrument 10, one end of the bubble of the leveling instrument C in the step b) is respectively read to be aligned with the line C of the leveling instrument for 5 degrees, 10 degrees and 15 degrees, namely the inclination angle beta of the main pin of the leveling instrumentiWhen the angle is 5 degrees, 10 degrees and 15 degrees respectively, the device detects the angle theta displayed by the display system 7i；
e) Respectively calculating the inclination angle beta of the main pin of the leveling measurer according to the algorithm formula (1) and the algorithm formula (2)iError of indication of (delta beta)iAnd relative error δ βi。
Figure BDA0003545740430000041
Figure BDA0003545740430000042
In the formula:
Δβi-the error in the indication of the inclination of the kingpin of the levelling instrument in units of degrees (°) at the ith measuring point (i ═ 1,2, 3);
δβi-the relative error of the inclination angle of the kingpin of the leveling instrument at the ith measuring point;
βi-the i-th measuring point surveyor's level gauge kingpin inclination, in units of degrees (°);
θi-the ith measurement point detects the angle, in degrees (°), displayed by the display system 7;
ηθproportionality coefficient (eta when the wheel is turned 20 deg. to the left or rightθ1.46; when the wheel turns 14 degrees to the left and right, etaθ2.07; when the wheel turns 10 degrees to the left and right, etaθ＝2.87)。
Example 2
As shown in fig. 4 and 5, when the leveling device a of the leveling wheel alignment measuring instrument 10 is calibrated by using the device of the present invention, the base 1 of the device of the present invention is placed on a flat hard platform, the adjusting knobs of the retractable legs 9 at the bottom of the base 1 of the device of the present invention are rotated to keep the device of the present invention in a horizontal state relative to the ground, the magnetic suction base at the bottom of the leveling wheel alignment measuring instrument 10 is adsorbed on the horizontal plate 4-2, and the leveling device a of the leveling wheel alignment measuring instrument 10 is calibrated, specifically, the calibration steps are as follows:
f) a hand wheel 5-2 of the driving device 5 is rotated to drive a transverse plate 4-2 of the detection rotary table 4 to rotate to a vertical position in parallel with the axis of the rotating shaft 3;
g) manually and slightly rotating the position of the magnetic suction seat of the leveling type wheel alignment measuring instrument 10 relative to the transverse plate 4-2 to enable a bubble of a leveling instrument D of the leveling type wheel alignment measuring instrument 10 to be in a horizontal middle position;
h) rotating a hand wheel 5-2 of a driving device 5 to drive a transverse plate 4-2 of a detection rotary table 4 to rotate in parallel to the axis of a rotating shaft 3, so that one end of a bubble of the leveling instrument A is aligned with a scribed line of the leveling instrument A for 0 degree, and setting the numerical value of a detection display system 7 to zero;
i) rotating a hand wheel 5-2 of a driving device 5 to drive a transverse plate 4-2 of a detection rotary table 4 to rotate parallel to the axis of a rotating shaft 3, and respectively reading one end of the bubble of the leveling instrument A in the step h) to align with the groove of the leveling instrument A for +1 degree, +3 degree, +5 degree, -1 degree, -3 degree and-5 degrees, namely the camber angle alpha of the leveling instrumentjThe angle displayed by the display system 7 is detected by the device of the invention when the angle is +1 degree, +3 degree, +5 degree, -1 degree, -3 degree, -5 degree respectively
Figure BDA0003545740430000051
j) Respectively calculating the camber angle alpha of the leveling instrument according to the algorithm formula (3) and the algorithm formula (4)jError of indication of (delta alpha)jAnd relative error delta alphaj。
Figure BDA0003545740430000052
Figure BDA0003545740430000053
In the formula:
Δαj-the indication error of the camber angle of the leveling instrument at the j-th measuring point (j ═ 1,2,3), in degrees (°);
δαj-the relative error in camber angle of the j-th measurement point leveling instrument;
αj-the camber angle, in degrees (°), of the leveling instrument at the jth measurement point;
Figure BDA0003545740430000061
the j-th measuring point detects the angle, in degrees (°), displayed by the display system 7.
Example 3
As shown in fig. 4 and 5, when the leveling device B of the leveling wheel alignment measuring instrument 10 is calibrated by using the device of the present invention, the base 1 of the device of the present invention is placed on a flat hard platform, the adjusting knobs of the telescopic legs 9 at the bottom of the base 1 of the device of the present invention are rotated to keep the device of the present invention in a horizontal state relative to the ground, the magnetic suction base at the bottom of the leveling wheel alignment measuring instrument 10 is adsorbed on the horizontal plate 4-2, and the leveling device B of the leveling wheel alignment measuring instrument 10 is calibrated, specifically, the calibration steps are as follows:
k) a hand wheel 5-2 of the driving device 5 is rotated to drive a transverse plate 4-2 of the detection rotary table 4 to rotate to a vertical position in parallel with the axis of the rotating shaft 3;
l) manually and slightly rotating the position of the magnetic suction seat of the leveling type wheel alignment measuring instrument 10 relative to the transverse plate 4-2 to enable a bubble of a leveling instrument D of the leveling type wheel alignment measuring instrument 10 to be in a horizontal middle position;
m) adjusting an inclination angle adjusting screw of the leveling instrument B to enable one end of a bubble of the leveling instrument B to be aligned to a scribed line of the leveling instrument B by 0 degree, and setting the numerical value of a detection display system 7 to be zero;
n) rotating a hand wheel 5-2 of the driving device 5, driving a transverse plate 4-2 of the detection rotary table 4 to rotate parallel to the axis of the rotating shaft 3, and respectively reading one end of the bubble of the leveling instrument B in the step m) to be aligned with the scribed lines of the leveling instrument B for-3 degrees, +6 degrees and +9 degrees, namely the back inclination angle gamma of the main pin of the leveling instrumentkWhen the angle phi is-3 degrees, +6 degrees and +9 degrees respectively, the device of the invention detects the angle psi displayed by the display system 7k；
o) respectively calculating the caster angle gamma of the main pin of the leveling device according to the algorithm formula (5) and the algorithm formula (6)kError of indication of (delta gamma)kAnd relative error delta gammak。
Figure BDA0003545740430000071
Figure BDA0003545740430000072
In the formula:
Δγk-the indication error of the caster angle of the main pin of the leveling instrument at the kth measuring point (k ═ 1,2,3,4), in degrees (°);
δγk-the relative error of the caster of the kingpin of the leveling instrument at the kth measuring point;
γk-the k-th measuring point surveyor's level caster, unit degree (°);
ψk-the kth measurement point detects the angle, in degrees (°), displayed by the display system 7;
ηθproportionality coefficient (eta when the wheel is turned 20 deg. to the left or rightθ1.46; when the wheel turns 14 degrees to the left and right, etaθ2.07; when the wheel turns 10 degrees to the left and right, etaθ＝2.87)。
Example 4
When the device is used for calibrating a portable braking performance tester, the base 1 of the device is placed on a flat hard platform, and the adjusting knobs of the telescopic supporting legs 9 at the bottom of the base 1 of the device are rotated, so that the device is kept in a horizontal state relative to the ground. The specific calibration steps are as follows:
p) placing a portable braking performance tester (or a self-contained split type sensor) on a transverse plate 4-2 of the detection rotary table 4, so that the mark of the portable braking performance tester (or the self-contained split type sensor) for indicating the advancing direction of the vehicle is vertical to the axis of the rotating shaft 3;
q) setting the display values of the portable braking performance tester and the detection display system 7 to zero;
r) rotating a hand wheel 5-2 of the driving device 5 to drive the detection rotary table 4 to rotate along the rotary shaft 3, driving the portable braking performance tester (or with a split sensor) to rotate by the transverse plate 4-2, and keeping the relative position of the portable braking performance tester (or with the split sensor) in the step p) and the transverse plate 4-2 unchanged in the rotating process;
s) reading the angle phi displayed by the device detection display system 7 of the inventionλWhen the angle is 12 degrees, 24 degrees, 37 degrees, 53 degrees and 90 degrees respectively, the 1 st measured value of the portable brake performance testerXλ1；
t) recycling the steps q) to s) for 2 times, and reading the measured values X of the portable brake performance tester 2 nd time and 3 rd timeλ2、Xλ3
u) calculating the angle phi displayed by the detection display system 7 according to the algorithm formula (7) respectivelyλThe average value of 3 measured values of the portable braking performance tester at 12 degrees, 24 degrees, 37 degrees, 53 degrees and 90 degrees
Figure BDA0003545740430000081
Figure BDA0003545740430000082
In the formula:
Figure BDA0003545740430000083
- λ measurement point (λ ═ 1,2,3,4,5) average of 3 measurements from a portable brake performance tester, in meters per second squared (m/s)2)；
Xλ1、Xλ2、Xλ3The measured values of the portable brake performance tester at the lambda measuring point for the 1 st time, the 2 nd time and the 3 rd time respectively are measured in the unit of meter per square second (m/s)2)；
v) calculating the angle phi displayed by the detection display system 7 according to the algorithm formula (8) respectivelyλThe standard deceleration value A corresponding to the device of the invention is 12 degrees, 24 degrees, 37 degrees, 53 degrees and 90 degreesλ。
Aλ＝sinφλ×9.80 (8)
Aλ-lambda measuring point the corresponding standard deceleration value of the inventive device in meters per second of square (m/s)2)；
φλThe lambda-th measurement point detects the angle, in degrees (°), displayed by the display system 7.
w) respectively calculating the angle phi displayed by the detection display system 7 according to the algorithm formula (9) and the formula (10)λThe indication error delta of the portable braking performance tester is 12 degrees and 24 degreesλAnd the repeatability of the indication value DeltaZλ。
Figure BDA0003545740430000084
ΔZλ＝Xλmax-Xλmin (10)
In the formula:
Δλ-the error of the indication of the portable brake performance tester at the lambda measuring point in meters per second of square (m/s)2)；
ΔZλ-repeatability of the reading of the portable brake performance tester at the lambda measurement point in meters per second of square (m/s)2)；
Xλmax-maximum of 3 measurements of the portable braking performance tester at the lambda measurement point, in meters per second of square (m/s)2)；
Xλmin-at the lambda measuring point, the minimum of the 3 measurements of the portable braking performance tester calibrated, in meters per second of square (m/s)2)；
x) calculating the angle phi displayed by the detection display system 7 according to the algorithm formula (11) and the formula (12) respectivelyλRelative error delta of portable brake performance tester at 37 degrees, 53 degrees and 90 degreesλAnd relative index repeatability deltaZλ。
Figure BDA0003545740430000091
Figure BDA0003545740430000092
In the formula:
δλ-the relative error of the portable brake performance tester at the lambda measurement point;
δZλmeasurement of lambdaAnd (4) point-portable brake performance tester relative indication repeatability.

Claims (6)

1. The utility model provides a level wheel alignment measuring apparatu, portable braking capability tester calibrating device which characterized in that: the device comprises a base (1), a rack (2) vertical to the base (1), a rotating shaft (3) arranged on the rack (2), a detection rotary table (4) connected to the rotating shaft (3), a driving device (5) used for driving the rotating shaft (3) to rotate, an angle encoder (6) arranged on the rotating shaft (3), and a detection display system (7) electrically connected with the angle encoder (6);
the detection rotary table (4) is formed by connecting a longitudinal plate (4-1) perpendicular to the horizontal plane and a transverse plate (4-2) parallel to the horizontal plane, the rotating shaft (3) is parallel to the horizontal plane, and the longitudinal plate (4-1) is vertically connected with the rotating shaft (3).
2. The leveling instrument, portable braking performance tester calibration apparatus of claim 1 wherein: the detection display system comprises a single chip microcomputer (7-1), a reset chip (7-2) electrically connected with the single chip microcomputer (7-1), a memory (7-3), a keyboard scanning matrix (7-4), an LED display dynamic scanning driving circuit (7-5), a line filter (7-6) and a switching power supply (7-7), wherein the angle encoder (6) is electrically connected with the single chip microcomputer (7-1).
3. The leveling instrument, portable braking performance tester calibration apparatus of claim 1 wherein: the driving device (5) comprises a turbine (5-1) arranged on the rotating shaft (3) and a hand wheel (5-2) arranged on the rack (2), a worm (5-3) is arranged on a hand wheel shaft of the hand wheel (5-2), and the turbine (5-1) is meshed with the worm (5-3).
4. The leveling instrument, portable braking performance tester calibration apparatus of claim 1 wherein: the detection turntable (4) is provided with a fixing device (8), the fixing device (8) comprises a stud (8-1) vertically arranged on the transverse plate (4-2) and a pressing plate (8-2) sleeved on the stud (8-1), and the pressing plate (8-2) can move along the axial direction of the stud (8-1).
5. The leveling instrument, portable braking performance tester calibration apparatus of claim 1 wherein: the angle encoder (6) is an incremental angle encoder.
6. The leveling instrument, portable braking performance tester calibration apparatus of claim 1 wherein: the bottom of the base (1) is provided with a telescopic supporting leg (9).
CN202210257861.2A 2022-03-14 2022-03-14 Leveling type wheel positioning measuring instrument and portable brake performance tester calibrating device Pending CN114659484A (en)

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CN202210257861.2A CN114659484A (en) 2022-03-14 2022-03-14 Leveling type wheel positioning measuring instrument and portable brake performance tester calibrating device

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Application Number Priority Date Filing Date Title
CN202210257861.2A CN114659484A (en) 2022-03-14 2022-03-14 Leveling type wheel positioning measuring instrument and portable brake performance tester calibrating device

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