CN103148777B - Connecting rod hole parallelism detecting system and detecting method based on eddy current transducer - Google Patents
Connecting rod hole parallelism detecting system and detecting method based on eddy current transducer Download PDFInfo
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- CN103148777B CN103148777B CN201310043519.3A CN201310043519A CN103148777B CN 103148777 B CN103148777 B CN 103148777B CN 201310043519 A CN201310043519 A CN 201310043519A CN 103148777 B CN103148777 B CN 103148777B
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Abstract
The invention discloses a connecting rod hole parallelism detecting system and detecting method based on an eddy current transducer. The detecting system mainly comprises a positioning system, a drive and transmission system, an information collecting and control system and a data processing system. The connecting rod hole parallelism detecting method based on the eddy current transducer includes the steps: when detection is carried out, firstly initialing the system, then placing a connecting rod to be detected and using the positioning system to enable the connecting rod to be positioned, enabling the eddy current transducer to pass through specified detecting positions in sequence under the control of programmable logic controller process of the drive and transmission system, and collecting an analog quantity signal, a limiting probe on-off signal and a lifting frame position signal, and finally, enabling collected data to be through matching of detected section circle centers, computation of the actual distance of two holes, computation of actual center line error and judgment of computing results to achieve the detection of the connecting rod hole parallelism. The connecting rod hole parallelism detecting system and detecting method based on the eddy current transducer is capable of rapidly and automatically achieving the detection of parallelism of center lines of two holes of a big end and a small end of the connecting rod.
Description
Technical field
The invention belongs to detection technique field, be specifically related to a kind of detection system and detection method of engine link concentric reducer holes centerline parallel degree.
Background technology
Connecting rod, as the core force transferring part of engine, connects piston and bent axle, the combustion-gas pressure acted on piston is passed to bent axle, output torque.In the course of the work, connecting rod bear gas load that piston pin transmits and itself swing and the to-and-fro movement of piston group time alternate load, mechanical load weight, condition of work is severe.Therefore, very high to the requirement of the structural strength of connecting rod, and the manufacturing accuracy of connecting rod itself directly affects the load state of connecting rod, and then affect the performance of engine.
If the depth of parallelism of connecting rod concentric reducer centerline hole does not meet the demands, directly affect the depth of parallelism of piston pin center line and crankshaft axis and the verticality with cylinder center, make that piston produces forward and backward inclination in the cylinder and gap is inconsistent, thus cause piston connecting rod unit to produce eccentric wear, accelerate the wearing and tearing of parts, time serious, can scuffing of cylinder bore be produced; Cause connecting rod distortion, cause and alter oil, gas blowby, engine power is declined, less economical, blowdown increases, and serviceable life shortens; Piston moves irregular in cylinder, and forward and backward waving occurs, and impingement cylinder wall produces engine knock, causes engine noise level to raise.
At present, the detection method of common connecting rod concentric reducer center pit centerline parallel degree roughly has: use dedicated gauge and mechanical type inspection jig, pure manual or automanual detection, " pick-up unit of link parallelism " of such as Taizhou Hongxin Crankshaft Co., Ltd's research and development etc., the general complicated operation of these class methods, efficiency are low, and measuring accuracy is also subject to the impact of many subjective factors, are not only difficult to realize full inspection when typical products in mass production is produced, and easily there is flase drop, produce waste; Be adopt the general comprehensive measuring instruments such as three-coordinates measuring machine to carry out the method detected in addition, this method testing cost is very high, and efficiency is lower.Adopt measuring method in addition, but on the one hand require higher to measured surface due to optical measurement, on the other hand to prism itself and moving guide rail requirement higher, be not suitable for measurement tie rod holes yet; " the intelligent linkage measuring system " of Beijing Jiaotong University's height Jing dawn design, although achieve automatic measurement, but its measurement point is by probe number quantitative limitation, and the own dimensions of sensor determines it is not suitable for the less occasion in the concentric reducer center pit aperture such as general vapour, diesel motor connecting rod.
Summary of the invention
The object of the invention is to overcome the above-mentioned deficiency for general vapour, diesel motor connecting rod concentric reducer centerline hole Parallel testing, disclose a kind of can the detection system of fast automatic measurement connecting rod concentric reducer holes centerline parallel degree.
Technical scheme of the present invention is:
Based on the detection system of the current vortex sensor tie rod holes depth of parallelism, it is characterized in that: this measuring system comprises positioning system, driving and gearing, information acquisition control system and data handling system, wherein:
Described positioning system comprises test desk, test desk support, V-arrangement locating piece, register pin, positioning adapter, location and trip bolt; The test desk of described positioning system is supported by test desk support, and V-arrangement locating piece is fixed on the left of test desk, and the center line of its V-arrangement locating piece overlaps with the horizontal center line of test desk; Register pin is fixed on test desk upper right side; Positioning adapter is fixed in test desk hole by two groups of location, trip bolt;
Described driving and gearing comprise drive motor, driving gear, stub end jacking gear, little head end jacking gear, stub end follower gear, little head end follower gear, tooth bar, stub end spring bearing, little head end spring bearing, rack frame, left limit probe, right limit probe; Drive motor is arranged in the middle of the holes of test desk, driving gear is arranged on the output shaft of drive motor, be positioned in the middle of large and small head end jacking gear, large and small head end jacking gear and be individually fixed in immediately below test desk holes, large and small head end spring bearing is arranged on large and small head end jacking gear respectively, stub end follower gear and little head end follower gear are arranged on large and small head end spring bearing respectively, rack frame fixes on the ground, rack frame is close to by tooth bar, and tooth bar engages with driving gear and large and small head end follower gear; Left limit probe and right limit probe are individually fixed in limit on the left and the limit on the right-right-hand limit position of tooth bar movement; Tooth bar is supported by rack frame;
Described information acquisition control system is made up of information collecting device and programmable controller program, and information collecting device comprises stub end current vortex sensor, little head end current vortex sensor, large head bracket, little head bracket, stub end jacking gear, little head end jacking gear, Programmable Logic Controller and computing machine; Large and small two end supports of information acquisition control system are through in positioning adapter respectively, and the upper end of large and small two end supports places large and small head end current vortex sensor respectively, and the lower end of large and small two end supports is placed on large and small head end jacking gear; Spacing probe, drive motor are connected with Programmable Logic Controller, large and small head end current vortex sensor is respectively by the input end of its supporting front end access programmable controller analog quantity, large and small head end jacking gear is connected with Programmable Logic Controller, and the computing machine that Programmable Logic Controller connects is realized the startup of information acquisition control system by programmable controller program and reads measurement data;
Described data handling system comprises the matching of the measured section center of circle, holes actual distance calculation, actual center line error calculation and result of calculation and judges four parts.
The tie rod holes Parallel testing method of application said detecting system, adopts following steps to realize the Parallel testing of tie rod holes:
1) system initialization: support is down to minimum altitude, large and small head end current vortex sensor is in 0 ° of position respectively, and tooth bar is in limit on the left position;
2) place tested connecting rod: be placed on test desk by tested connecting rod, microcephaly is close to V-arrangement locating piece, and major part side is close to register pin; Check large and small head end electric vortex sensor measuring head and holes tested surface spacing, if beyond its linearity measuring range, then adjust the large and small fixed position of head end current vortex sensor on support and make its measuring head and holes tested surface spacing be within the scope of its linearity measuring range;
3) sensor image data: after two elevating brackets rise to the low measurement position of holes respectively, drive motor at the uniform velocity rotates forward, and tooth bar starts to move to right; Large and small head end current vortex sensor rotates from respective 0 ° of position, and measures, and measurement data is transferred to computing machine by PLC and preserves; When tooth bar moves to limit on the right-right-hand limit position, right limit probe signal suddenlys change; Drive motor stall, now large and small head end current vortex sensor is in 360 ° of respective positions; Elevating bracket rises to high measurement position; Motor at the uniform velocity reverses, and tooth bar moves to left, and large and small head end current vortex sensor is measured; Tooth bar moves to limit on the left position, and left limit probe signal suddenlys change, and large and small head end current vortex sensor gets back to 0 ° of respective position; Motor stalling; Elevating bracket gets back to extreme lower position;
4) data processing: large, little head end current vortex sensor by measuring-signal by front end and PLC, rectification is carried out to signal, filtering, amplify, computing machine is inputted after A/D conversion, the distance r of input quantity and measurement point and theoretical center, if the rotational speed of drive motor is V, rotation time is T, then can draw angle θ residing for this measurement point, and then obtain this point coordinate (r, θ), least square method is used to carry out the matching of the measured section center of circle to the point in same measurement cross section, obtain the home position of this measuring surface, again by two home positions in big end hole, obtain big end hole actual center line, by calculating the distance of little head bore two measurement point to this straight line, calculate the actual range of holes, holes actual range is compared with design centre linear distance respectively, complete actual center line error calculation, and compare with the design limits of error, judge result of calculation, finally realize the detection of the tie rod holes depth of parallelism.
The significant beneficial effect of the present invention is the measurement that can realize connecting rod concentric reducer holes centerline parallel degree quickly and automatically.
Accompanying drawing explanation
Fig. 1 is the wiring layout of positioning system of the present invention, driving and kinematic train and information collecting device.
Fig. 2 is A-A cut-open view in Fig. 1 of the present invention.
Fig. 3 is that information acquisition of the present invention controls schematic diagram.
Fig. 4 is measurement procedure figure of the present invention.
Fig. 5 is physical parameter schematic diagram in measuring process of the present invention.
The tested connecting rod of each parts: 1-shown in Fig. 1, the little head end current vortex sensor of 2-, the little head bracket of 3-, the large head bracket of 4-, 5-stub end current vortex sensor, 6-positioning adapter, 7-rack frame, 8-locates, trip bolt, 9-left limit is popped one's head in, 10-tooth bar, the little head end follower gear of 11-, 12-V shape locating piece, the little head end jacking gear of 13-, the little head end spring bearing of 14-, 15-driving gear, 16-drive motor, 17-test desk, 18-stub end follower gear, 19-stub end jacking gear, 20-register pin, 21-stub end spring bearing, 22-test desk support, 23-right limit is popped one's head in.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Tie rod holes measurement of paralleism system based on current vortex sensor is made up of positioning system, driving and kinematic train, information acquisition control system, data handling system four subsystems, and wherein, information acquisition control system comprises information collecting device and PLC program.
1. the hardware composition of measuring system
As shown in Figure 1, positioning system is made up of test desk 17, test desk support 22, V-arrangement locating piece 12, register pin 20, positioning adapter 6, location, trip bolt 8.Test desk 17 is supported by test desk support 22, V-arrangement locating piece 12 is fixed on the left of test desk 17, its center line overlaps with test desk horizontal center line, register pin 20 is fixed on test desk 17 upper right side, during measurement, tested connecting rod 1 is placed on test desk 17, and connecting rod 1 microcephaly outside surface is close to V-arrangement locating piece 12, connecting rod 1 major part is close to register pin 20, in order to determine the relative position of tested connecting rod and test desk; Positioning adapter 6 is individually fixed in the measured hole of test desk 17 by two groups of location, trip bolt 8, and often group comprises three location, trip bolt 8,120 °, interval, and large aperture adds up to 4 groups totally 12, to determine the relative position of lining center line and test desk 17; Test desk 17 is processed with two holes, the center line of holes overlaps with the theoretical centerline of connecting rod 1 holes respectively, and then determines the relative position of tested connecting rod 1, test desk 17, positioning adapter 6.
As depicted in figs. 1 and 2, described driving, gearing comprise drive motor 16, driving gear 15, large and small head end jacking gear 19 and 13, stub end follower gear 18, little head end follower gear 11, tooth bar 10, stub end spring bearing 21, little head end spring bearing 14, rack frame 7, left limit probe 9, right limit probe 23; Described drive motor is arranged in the middle of the holes of test desk, driving gear is arranged on the output shaft of drive motor 16, be positioned in the middle of large and small head end jacking gear, large and small head end jacking gear is individually fixed in immediately below test desk 17 holes, little head end spring bearing and stub end spring bearing are arranged on large and small head end jacking gear respectively, large and small head end follower gear is arranged on large and small head end spring bearing respectively, rack frame fixes on the ground, rack frame is close to by tooth bar, and tooth bar engages with driving gear and large and small head end follower gear; Tooth bar engages with driving gear and large and small head end follower gear; Left limit probe and right limit probe are individually fixed in limit on the left and the limit on the right-right-hand limit position of tooth bar movement; Tooth bar is supported by rack frame, and two rack frames are placed between large and small head end jacking gear.
Described drive motor drives driving gear rotate and drive tooth bar to move, and tooth bar only does the translation of left and right directions, and drives large and small head end follower gear synchronous axial system.Rack frame ensures that tooth bar engages well with large and small head end follower gear, firm supporting and stable.
Described information collecting device is by little head end current vortex sensor 2, stub end current vortex sensor 5, little head bracket 3, large head bracket 4, microcephaly's lifting support 13, major part lifting support 19, Programmable Logic Controller and computing machine composition, greatly, microcephaly two end support is through in positioning adapter respectively, greatly, the upper end of microcephaly two end support is placed greatly respectively, little head end current vortex sensor, greatly, the lower end of microcephaly two end support is placed on greatly, little head end jacking gear 19, on 13, the lower end of concentric reducer two end support is connected with little head end follower gear 11 and stub end follower gear 18 respectively by key, move with tooth bar and rotate.
Left and right spacing probe 9 and 23, drive motor 16 are connected with Programmable Logic Controller, little head end current vortex sensor 2 and stub end current vortex sensor 5 access the input end of programmable controller analog quantity respectively by its supporting front end, little head end jacking gear 13 and stub end jacking gear 19 are commercial means, carry interface RS232 by it to be connected with Programmable Logic Controller, Programmable Logic Controller sends signal to large and small head end jacking gear 19 and 13 can control its lifting, and Programmable Logic Controller is connected with computing machine.
2. the Installation and Debugging of measuring system
Based on current vortex sensor tie rod holes measurement of paralleism system needed in part except test desk need customized according to the size of tested connecting rod except, the connecting rod that other parts are all applicable to most of specification is measured.Installation method is as follows:
Below measured hole, test desk 17 is installed lower two groups of location, trip bolt 8 respectively, often organize 3,120 °, interval, large aperture adds up to 4 groups totally 12.For the location of stationary positioned lining, trip bolt 8 on adjustment test desk 17, ensure two positioning adapters 6 and the verticality of test desk supporting surface and the depth of parallelisms of two positioning adapter center lines respectively, the distance of the center line of positioning adapter 6 and V-arrangement locating piece 12, register pin 20 meets accuracy requirement; Be positioned over respectively on large and small head end jacking gear 19,13 after large and small head bracket 3,4 is connected with large and small head end follower gear 18,11 by key respectively through positioning adapter 6, and ensure that support can smooth rotation.The measuring head of large and small head end current vortex sensor 5,2 is separately fixed at large and small head end jacking gear 13,19 upper brace edge, and measuring junction is slightly outstanding; The cable connecting large and small head end current vortex sensor is worn by the through hole of large and small head end jacking gear 19,13 head respectively, the data line connecting little head end current vortex sensor 2 is walked around from the downside of little head bracket 3, the data line connecting stub end current vortex sensor 5 is walked around from the top of large head bracket 4, be fixed in the deep gouge of test desk 17 after staying suitable length, finally input large and small head end current vortex sensor front end respectively.
The position of adjustment tooth bar 10, the gear 18 that its right-hand member is connected near big end jacking gear 19, determines that the high order end of tooth bar 10 is left end limit of sports record position; Driving tooth bar moves right, and large and small head end jacking gear is rotated a circle, and determines that tooth bar low order end is limit on the right-right-hand limit position; Spacing probe 9 and 23 is placed respectively at two limit positions place.Two rack frames are placed between large and small head end jacking gear, ensure that rack and pinion engagement is good, firm supporting, stable.Driving gear is directly installed on the output shaft of drive motor 16, and is arranged in the middle of large and small head end jacking gear.
During commissioning examination, drive motor 16 is moved by gear driven tooth bar, and drive two engaged wheels to rotate, support rotates thereupon simultaneously.When tooth bar is motionless, large and small head end jacking gear carries out elevating movement respectively, and support moves up and down with large and small head end jacking gear under the constraint of positioning adapter.Ensure that, between positioning adapter and support, between rack-and-pinion, lubrication is good, and system cloud gray model is steady.
Extreme position respectively at tooth bar 10 two ends installs left limit probe 9 and right limit probe 23.When tooth bar is positioned at limit on the left position, its respective initial position is thought in the residing respectively position of large and small head end current vortex 5,2 sensor, is designated as 0 ° of position, now triggers left limit probe; Drive motor 16 rotates forward band carry-over bar and moves right, and when large and small head end current vortex 5,2 sensor rotation one week final position, is designated as 360 ° of positions, now triggers right limit probe 23.In like manner, drive motor 16 reverses, and again triggers left limit probe 9 when 0 ° of position got back to by large and small head end current vortex 5,2 sensor.Like this, not only determine large and small head end current vortex 5,2 sensor present position, and ensure that rack and pinion keeps engagement good.
3. the data acquisition of measuring system
When large and small head end current vortex sensor 5,2 be in respectively as shown in Figure 1 position time, think its respective initial position, corresponding angle is 0 °, now trigger left limit probe 9, drive motor 16 main story, be with carry-over bar 10 to move right by gear 15, drive two engaged wheels 11,18 to rotate, support 3,4 rotates thereupon simultaneously; After large and small head end current vortex sensor 5,2 rotates a circle and reaches 360 ° of positions, trigger right limit probe 23, drive motor 16 reverses, and again triggers left limit probe 9 when large and small head end current vortex sensor 5,2 gets back to 0 ° of position; When tooth bar is motionless, large and small head end jacking gear 13,19 carries out elevating movement respectively, and support 3,4 moves up and down with jacking gear under the constraint of positioning adapter 6, ensures that, between positioning adapter and support, between rack-and-pinion, lubrication is good, and system cloud gray model is steady.
The data acquisition of measuring system is as shown in Figure 3 and Figure 4:
1) support 3,4 is down to minimum altitude by system initialization, and large and small head end current vortex sensor 5,2 is in position as shown in Figure 1 respectively, and is defaulted as 0 °, and now, tooth bar 10 left end is in limit on the left position.
2) placing tested connecting rod is placed on test desk 17 by connecting rod 1, and microcephaly is close to V-arrangement locating piece 12, and major part side is close to register pin 20.Check that large and small head end current vortex sensor 5,2 measuring head and holes are in its linearity measuring range by side spacing, otherwise adjust the large and small fixed position of head end current vortex sensor 5,2 on support.
3) sensor image data two elevating bracket 13,19 rises to the low measurement position H of holes respectively
p1, H
q1, as shown in Figure 4.Drive motor 16 at the uniform velocity rotates forward, and tooth bar starts to move to right, and large and small head end current vortex sensor 5,2 rotates and measures from initial angle (0 °), and measurement data is transferred to computing machine by programmable controller PLC and preserves.When tooth bar 10 right-hand member reaches limit on the right-right-hand limit position, right limit is popped one's head in 23 sign mutations, drive motor 16 stall.Large and small head end jacking gear 13,19 rises to high measurement position H
p2, H
q2.Drive motor 16 at the uniform velocity reverses; When tooth bar 10 left end reaches limit on the left position, left limit probe 9 sends signal, drive motor 16 stall.Elevating bracket returns extreme lower position H
p0, H
q0.
4. the data processing of measuring system
PC end presets the rotational speed V of drive motor, the minimum altitude H of little head end jacking gear
p0, low measurement position height H
p1, high measurement position height H
p2, stub end jacking gear minimum altitude H
q0, low measurement position height H
q1, high measurement position height H
q2.
1) each current vortex sensor of the survey center of circle, cross section matching rotates a circle and can obtain one group of coordinate data.First coordinate transform is carried out to these group data, by the coordinate figure of each point under polar coordinate system change in location coordinate system at a right angle.According to the distance r of rotational speed V, rotation time T and measurement point and theoretical center, obtain one group of coordinate position (r, θ) that a current vortex sensor rotates a circle corresponding, use this measuring surface home position of least square fitting (x
0, y
0) and the radius R of correspondence.Obtain little head bore H respectively
p1measuring surface center of circle P
1, H
p2measuring surface center of circle P
2, big end hole H
q1measuring surface center of circle Q
1, H
q2measuring surface center of circle Q
2.
2) holes actual distance calculation is by big end hole two measuring surface center of circle Q
1, Q
2determine big end hole center line l
q, calculate little head bore two center of circle P respectively
1, P
2to l
qdistance d
1, d
2, namely obtain the actual range of two centerline holes in high and low two measured sections of little head bore.
3) if the design centre linear distance of actual center line error calculation holes is d
s, then think absolute error δ=| d-d
s|, substitute into d
1, d
2calculate δ
1, δ
2, i.e. holes centerline error in high and low two measured sections of little head bore.
4) result of calculation judges to calculate limits of error δ according to designing the accuracy requirement provided
max.If δ
1≤ δ
max, δ
2≤ δ
max, then think and meet design accuracy requirement, otherwise do not meet designing requirement.
The distance r of input quantity and measurement point and theoretical center.If the rotational speed of drive motor is V, rotation time is T, then can draw angle θ residing for this measurement point, and then obtains this point coordinate (r, θ).
Claims (2)
1. based on the detection system of the current vortex sensor tie rod holes depth of parallelism, it is characterized in that: this detection system comprises positioning system, driving and gearing, information acquisition control system and data handling system, wherein:
Described positioning system comprises test desk, test desk support, V-arrangement locating piece, register pin, positioning adapter, location and trip bolt; The test desk of described positioning system is supported by test desk support, and V-arrangement locating piece is fixed on the left of test desk, and the center line of its V-arrangement locating piece overlaps with the horizontal center line of test desk; Register pin is fixed on test desk upper right side; Positioning adapter is fixed in test desk hole by two groups of location, trip bolt;
Described driving and gearing comprise drive motor, driving gear, stub end jacking gear, little head end jacking gear, stub end follower gear, little head end follower gear, tooth bar, stub end spring bearing, little head end spring bearing, rack frame, left limit probe, right limit probe; Drive motor is arranged in the middle of the holes of test desk, driving gear is arranged on the output shaft of drive motor, be positioned in the middle of large and small head end jacking gear, large and small head end jacking gear and be individually fixed in immediately below test desk holes, large and small head end spring bearing is arranged on large and small head end jacking gear respectively, stub end follower gear and little head end follower gear are arranged on large and small head end spring bearing respectively, rack frame fixes on the ground, rack frame is close to by tooth bar, and tooth bar engages with driving gear and large and small head end follower gear; Left limit probe and right limit probe are individually fixed in limit on the left and the limit on the right-right-hand limit position of tooth bar movement; Tooth bar is supported by rack frame;
Described information acquisition control system is made up of information collecting device and programmable controller program, and information collecting device comprises stub end current vortex sensor, little head end current vortex sensor, large head bracket, little head bracket, stub end jacking gear, little head end jacking gear, Programmable Logic Controller and computing machine; Large and small two end supports of information acquisition control system are through in positioning adapter respectively, and the upper end of large and small two end supports places large and small head end current vortex sensor respectively, and the lower end of large and small two end supports is placed on large and small head end jacking gear; Spacing probe, drive motor are connected with Programmable Logic Controller, large and small head end current vortex sensor is respectively by the input end of its supporting front end access programmable controller analog quantity, large and small head end jacking gear is connected with Programmable Logic Controller, and the computing machine that Programmable Logic Controller connects is realized the startup of information acquisition control system by programmable controller program and reads measurement data;
Described data handling system comprises the matching of the measured section center of circle, holes actual distance calculation, actual center line error calculation and result of calculation and judges four parts.
2. the detection method of the detection system based on the current vortex sensor tie rod holes depth of parallelism according to claim 1, is characterized in that, adopts following steps to realize tie rod holes Parallel testing:
1) system initialization: support is down to minimum altitude, large and small head end current vortex sensor is in 0 ° of position respectively, and tooth bar is in limit on the left position;
2) place tested connecting rod: be placed on test desk by tested connecting rod, microcephaly is close to V-arrangement locating piece, and major part side is close to register pin; Check large and small head end electric vortex sensor measuring head and holes tested surface spacing, if beyond its linearity measuring range, then adjust the large and small fixed position of head end current vortex sensor on support and make its measuring head and holes tested surface spacing be within the scope of its linearity measuring range;
3) sensor image data: after two elevating brackets rise to the low measurement position of holes respectively, drive motor at the uniform velocity rotates forward, and tooth bar starts to move to right; Large and small head end current vortex sensor rotates from respective 0 ° of position, and measures, and measurement data is transferred to computing machine by PLC and preserves; When tooth bar moves to limit on the right-right-hand limit position, right limit probe signal suddenlys change; Drive motor stall, now large and small head end current vortex sensor is in 360 ° of respective positions; Elevating bracket rises to high measurement position; Motor at the uniform velocity reverses, and tooth bar moves to left, and large and small head end current vortex sensor is measured; Tooth bar moves to limit on the left position, and left limit probe signal suddenlys change, and large and small head end current vortex sensor gets back to 0 ° of respective position; Motor stalling; Elevating bracket gets back to extreme lower position;
4) data processing: large, little head end current vortex sensor by measuring-signal by front end and PLC, rectification is carried out to signal, filtering, amplify, computing machine is inputted after A/D conversion, the distance r of input quantity and measurement point and theoretical center, if the rotational speed of drive motor is V, rotation time is T, then can draw angle θ residing for this measurement point, and then obtain this point coordinate (r, θ), least square method is used to carry out the matching of the measured section center of circle to the point in same measurement cross section, obtain the home position of this measuring surface, again by two home positions in big end hole, obtain big end hole actual center line, by calculating the distance of little head bore two measurement point to this straight line, calculate the actual range of holes, holes actual range is compared with design centre linear distance respectively, complete actual center line error calculation, and compare with the design limits of error, judge result of calculation, finally realize the detection of the tie rod holes depth of parallelism.
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