CN201964879U - Device for detecting cam contour - Google Patents

Device for detecting cam contour Download PDF

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Publication number
CN201964879U
CN201964879U CN2011200551129U CN201120055112U CN201964879U CN 201964879 U CN201964879 U CN 201964879U CN 2011200551129 U CN2011200551129 U CN 2011200551129U CN 201120055112 U CN201120055112 U CN 201120055112U CN 201964879 U CN201964879 U CN 201964879U
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CN
China
Prior art keywords
cam
measuring head
card
displacement sensor
numerical control
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN2011200551129U
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Chinese (zh)
Inventor
丁仕燕
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Changzhou Institute of Technology
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Changzhou Institute of Technology
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Priority to CN2011200551129U priority Critical patent/CN201964879U/en
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Publication of CN201964879U publication Critical patent/CN201964879U/en
Anticipated expiration legal-status Critical
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Abstract

The utility model provides a device for detecting the cam contour with a simple structure, high detection precision and higher efficiency, which comprises a numerical control turntable, a linear motor, a laser measuring head, a grating bar displacement sensor, a coder and an industrial control machine, wherein the numerical control turntable is used for driving a cam to horizontally and coaxially rotate around a vertical mandrel; the linear motor is horizontally arranged at one side of the numerical control turntable; the laser measuring head is arranged on a rotor and at one side of the cam; the grating bar displacement sensor is used for measuring the horizontal displacement of the rotor; the coder is used for detecting the rotating angle of the cam; and the industrial control machine is used for controlling the numerical control turntable and the linear motor to act and obtaining the contour data of the cam according to data measured by the laser measuring head, the grating bar displacement sensor and the coder.

Description

A kind of cam contour pick-up unit
Technical field
The utility model relates to a kind of cam contour pick-up unit.
Background technology
Cam mechanism is widely used in various automated machines, exact instrument, automation control system etc.Accomplish high precision, detect cam expeditiously, and correctly handle, evaluate its every error, in time feed back the quality information of cam apace, the method that traditional optical-mechanical amount instrument and artificial data are handled can not adapt to the needs of the extensive transfer matic production of adopting of cam.Along with the high speed development of auto industry, engineering machinery etc. and improving constantly of manufacturing technology,, be the technical barrier that this area will solve to accuracy of detection and the efficient that how to improve the cam machining precision.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of simple in structure, accuracy of detection and the higher cam contour pick-up unit of efficient.
For solving the problems of the technologies described above, the utility model provides a kind of cam contour pick-up unit, comprising: be used to drive cam around numerical control rotating platform, the level of the vertical coaxial rotation of axle level be located at numerical control rotating platform one side linear electric motors, be located on the mover of these linear electric motors and in the laser measuring head of cam one side, be used to measure the grating rule displacement sensor of the horizontal displacement of described mover, the scrambler of the anglec of rotation that is used to detect cam and the industrial computer that is used to control described numerical control rotating platform and linear electric motors action; The data that industrial computer records according to described laser measuring head, grating rule displacement sensor and scrambler simultaneously draw the outline data of cam.
Particularly, described industrial computer comprises: the motion control card that is used for controlling in real time described numerical control rotating platform and linear electric motors action, the laser displacement sensor capture card of the spacing of the outline that is used for real-time detection laser measuring head and cam that links to each other with described laser measuring head, the encoder to count card that links to each other with scrambler with described grating rule displacement sensor, and the CPU element that links to each other with described motion control card, laser displacement sensor capture card and encoder to count card by system bus.
Further, described numerical control rotating platform links to each other with a turntable motor transmission, and described motion control card is by the action of a turntable motor driver control turntable motor; Motion control card is simultaneously by the action of straight line motor driver control linear electric motors.
The utlity model has positive effect: (1) cam contour pick-up unit of the present utility model adopts non-contact measurement method, the laser measuring head motion is directly driven by linear electric motors, do not have drive gap, dynamic rate is high, movement velocity wide ranges (1 little meter per second~5 meter per seconds) and motion steadily, dynamic performance is good.Measuring head does not have the machinery wearing and tearing in the measuring process, and with other contact type measurement, speed is fast, precision is high, precision stability is good.The laser measuring head of selected range scope little (range starting point~range terminal point), under the constant condition of its linearity, measuring error is little.Laser measuring head horizontal motion distance is finished by the grating rule displacement sensor, directly changes under the big situation at the utmost point of cam, still can obtain high measuring accuracy, higher price-performance ratio; (2) in order to guarantee that laser measuring head measures all the time in range ability, guarantee that promptly measuring head and cam contour distance is between range starting point and range terminal point, the utility model employing numerical control interpolating method rotatablely moves cam and laser measuring head horizontal direction rectilinear motion links.The cam anglec of rotation is detected by the scrambler that links to each other with axle, and axle is being determined by the scrambler zero pulse at circumferencial direction zero point.
Description of drawings
Fig. 1 is the structural representation of cam contour pick-up unit of the present utility model;
Fig. 2 for the cam contour pick-up unit among Fig. 1 cam is not installed the time structural drawing.
Embodiment
See Fig. 1-2, the cam contour pick-up unit of present embodiment comprises: be used to drive cam 10 around numerical control rotating platform 1, the level of the vertical coaxial rotation of axle 1-1 level be located at the linear electric motors 3 of numerical control rotating platform 1 one sides, the mover 3-1 that is located at these linear electric motors 3 goes up and in the laser measuring head 2 of cam 10 1 sides, be used to measure the horizontal displacement of described mover 3-1 grating rule displacement sensor 4, be used to detect the scrambler 5 and the industrial computer of the anglec of rotation of cam 10; Described industrial computer is controlled described numerical control rotating platform 1 and linear electric motors 3 actions, and draws the outline data of cam 10 according to the data that described laser measuring head 2, grating rule displacement sensor 4 and scrambler 5 record.
Described industrial computer comprises: the motion control card that is used for controlling in real time described numerical control rotating platform 1 and linear electric motors 3 actions, the laser displacement sensor capture card of the spacing of the outline that is used for real-time detection laser measuring head 2 and cam 10 that links to each other with described laser measuring head 2, the encoder to count card that links to each other with scrambler 5 with described grating rule displacement sensor 4, by system bus and described motion control card, the CPU element that the laser displacement sensor capture card links to each other with the encoder to count card, and the LCD that is used to show and contrast the outline data of cam 10 that links to each other with described system bus through video card.Described numerical control rotating platform 1 links to each other with a turntable motor 6 transmissions, and motion control card passes through the action of a turntable motor driver control turntable motor 6, and then controls the action of described numerical control rotating platform 1; Motion control card is simultaneously by 3 actions of straight line motor driver control linear electric motors.
The anglec of rotation at described cam 10 is θ iThe time, the outline of the cam 10 that records and the spacing of laser measuring head 2 i.e. first pitch measurements are Simultaneously, grating rule displacement sensor 4 measure described mover 3-1 in the horizontal direction with the hard zero-bit of grating rule displacement sensor 4 Spacing promptly second pitch measurements be , i=1,2,3 ... n; N detects described first, second pitch measurements in the process that rotates a circle of cam 10 , Number of times, n can determine according to the cam gap size that takes measurement of an angle, for example: 180,360,720 etc., n is big more, the outline data of the cam 10 that records are accurate more; 0 °≤θ i<360 °, θ I+1iiI-1
For improving accuracy of detection to the higher position of cam requirement on machining accuracy (as the outline data of the lug boss of cam), guarantee detection efficiency simultaneously as far as possible, can be arranged on when detecting this position, reduce θ I+1And θ iDifference.
If the outline data of known cam 10 , the detection method of then described cam contour pick-up unit comprises:
A, with i.e. first spacing of the spacing of laser measuring head 2 and the cylindrical of axle 1-1 Be controlled at that (best embodiment is: first spacing in the range of laser measuring head 2 Be controlled near the range mid point of laser measuring head 2, because near the measuring accuracy the range mid point is the highest), detect and write down described first spacing then , detect simultaneously and write down described mover 3-1 in the horizontal direction with described hard zero-bit I.e. second spacing of spacing
B, cam 10 no gaps are matched with on the described axle 1-1, when beginning to control cam 10 and rotating a circle, the outline of control laser measuring head 2 relative cams 10 according to + Orbiting motion; Simultaneously, control described first pitch measurements All the time be in that (best embodiment is: first spacing in the range of laser measuring head 2 Be controlled near the range mid point of laser measuring head 2, because near the measuring accuracy the range mid point is the highest; ), and obtain anglec of rotation θ with cam 10 iCorresponding described first, second pitch measurements ,
C, by the axle diameter D and described , , , , calculate the utmost point footpath measured value of cam 10 :
D, with described utmost point footpath measured value With described outline data Compare, draw the outline mismachining tolerance of cam 10.
If the outline data of unknown cam 10 , the detection method of then described cam contour pick-up unit comprises:
A, with i.e. first spacing of the spacing of laser measuring head 2 and the cylindrical of axle 1-1 Be controlled in the range of laser measuring head 2, detect and write down described first spacing then , detect simultaneously and write down described mover 3-1 in the horizontal direction with described hard zero-bit I.e. second spacing of spacing
B, cam 10 no gaps are matched with on the described axle 1-1, when beginning to control cam 10 and rotating a circle, the mover 3-1 of control linear electric motors 3 according to described first pitch measurements that laser measuring head 2 records is Size do near or away from the straight-line displacement of cam 10, to control described first pitch measurements All the time be in the range of laser measuring head 2, and obtain anglec of rotation θ with cam 10 iCorresponding described first, second pitch measurements ,
C, by the axle diameter D and described , , , , calculate the outline data of cam 10, also be utmost point footpath measured value :
Above-mentioned laser measuring head 2 can be selected the high-precision laser displacement transducer of the PRIMUS 1000-2 type of Germany based on PC, and its main performance index is: range 2mm, range starting point 16mm, range terminal point 20mm, range mid point 18mm; The linearity 1 μ m, resolution 0.2 μ m; Spot diameter 35 μ m.
The grating rule displacement sensor is made up of scale grating and grating reading head two parts.The scale grating is fixed on the mover 3-1 of linear electric motors 3, on the stator 3-2 of grating reading head dress linear electric motors 3.The grating rule displacement sensor 4 of present embodiment is selected German Heidenhain LIP571 type grating chi, the square-wave signal of grating reading head output expression measured value, accuracy class ± 1 μ m; Resolution 0.2 μ m.The model of laser measuring head and grating chi, precision, range can be made suitable adjustment according to Cam Detection accuracy requirement, cam utmost point footpath size.
Described encoder to count card is used to write down the pulse number of grating rule displacement sensor 4, scrambler 5 generations, and then calculates linear motor rotor displacement, the cam anglec of rotation.Motion control card control cam and linear motor rotor are pressed the given trace motion.
A hard zero-bit is installed on the right side of the grating chi in the grating rule displacement sensor 4, as the starting point of grating rule displacement sensor 4 measuring distances tolerance.
Obviously, the foregoing description of the present utility model only is for the utility model example clearly is described, and is not to be qualification to embodiment of the present utility model.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give exhaustive to all embodiments.And these belong to conspicuous variation or the change that spirit of the present utility model extended out and still are among the protection domain of the present utility model.

Claims (3)

1. a cam contour pick-up unit is characterized in that comprising: be used to drive the numerical control rotating platform (1) of cam (10) around the coaxial rotation of vertical axle (1-1) level, level is located at the linear electric motors (3) of numerical control rotating platform (1) one side, the mover (3-1) of being located at these linear electric motors (3) is gone up and in the laser measuring head (2) of cam (10) one sides, be used to measure the grating rule displacement sensor (4) of the horizontal displacement of described mover (3-1), be used to detect the scrambler (5) of the anglec of rotation of cam (10), and the industrial computer that is used to control described numerical control rotating platform (1) and linear electric motors (3) action.
2. cam contour pick-up unit according to claim 1, it is characterized in that: described industrial computer comprises: the motion control card that is used for controlling in real time described numerical control rotating platform (1) and linear electric motors (3) action, the laser displacement sensor capture card of the spacing of the outline that is used for real-time detection laser measuring head (2) and cam (10) that links to each other with described laser measuring head (2), the encoder to count card that links to each other with scrambler (5) with described grating rule displacement sensor (4), and by system bus and described motion control card, the CPU element that the laser displacement sensor capture card links to each other with the encoder to count card.
3. cam contour pick-up unit according to claim 2 is characterized in that: described numerical control rotating platform (1) links to each other with a turntable motor (6) transmission, and described motion control card is by the action of a turntable motor driver control turntable motor (6); Motion control card is simultaneously by straight line motor driver control linear electric motors (3) action.
CN2011200551129U 2011-03-04 2011-03-04 Device for detecting cam contour Expired - Fee Related CN201964879U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011200551129U CN201964879U (en) 2011-03-04 2011-03-04 Device for detecting cam contour

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Application Number Priority Date Filing Date Title
CN2011200551129U CN201964879U (en) 2011-03-04 2011-03-04 Device for detecting cam contour

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CN201964879U true CN201964879U (en) 2011-09-07

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103868469A (en) * 2014-03-07 2014-06-18 西安交通大学 Full automatic following tracking precise scanning detecting device and method for camshaft complex molded-line lift

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103868469A (en) * 2014-03-07 2014-06-18 西安交通大学 Full automatic following tracking precise scanning detecting device and method for camshaft complex molded-line lift

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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: 20110907

Termination date: 20140304