CN103273382A - Reading device of grating ruler - Google Patents
Reading device of grating ruler Download PDFInfo
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- CN103273382A CN103273382A CN2013102071420A CN201310207142A CN103273382A CN 103273382 A CN103273382 A CN 103273382A CN 2013102071420 A CN2013102071420 A CN 2013102071420A CN 201310207142 A CN201310207142 A CN 201310207142A CN 103273382 A CN103273382 A CN 103273382A
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Abstract
The invention provides a reading device of a grating ruler and relates to the technical field of photoelectric measurement. The reading device of the grating ruler solves the problem that an existing grating ruler is poor in reliability. The reading device of the grating ruler comprises a light source, a ruler grating, an indicating grating, a photoelectric sensor and a reading module. The reading module comprises a collecting module, a position calculating module, a storage module, a fault detecting module and a fault correcting module. The reliability of currently obtained position information can be accurately judged through periodical calculation of position information and the distance between the currently obtained position information and the last position information. If the currently obtained position information is judged to be unreliable, a current position can be predicted according to the past multiple times of position information so that accurate position information can be obtained. The reading device of the grating ruler is suitable for the technology of photoelectric measurement.
Description
Technical field
The present invention relates to the photoelectric measurement technical field, be specifically related to a kind of reading plotter of grating chi.
Background technology
The grating chi is widely used in the Digit Control Machine Tool as linear position sensors.In Digit Control Machine Tool, digital control system is carried out machining according to the positional information of grating chi feedback, so the precision of grating chi has directly determined machining accuracy of NC machine tool.
The actual environment for use of grating chi is comparatively abominable, the metal dust that produces in the work engineering of Digit Control Machine Tool, cooling fluid and various electromagnetic interference can have influence on the certainty of measurement of grating chi even can make it produce big measure error, directly reduce machining accuracy of NC machine tool even can damage lathe or the initiation major accident.
At present usually the method that adopts Digit Control Machine Tool that software limit and hardware limit are set prevents that still this method can not guarantee machining accuracy under the situation that the grating chi is made mistakes because the grating chi is made mistakes and caused a serious accident.
Summary of the invention
The present invention the invention provides a kind of reading plotter of grating chi in order to improve reliability and the operating accuracy of grating chi reading.
A kind of reading plotter of grating chi comprises light source, scale grating, indication grating, photoelectric sensor and reading module, and described reading module comprises acquisition module, position computation module, memory module, error detection module and correction module; The light that described light source sends optical signal after scale grating and indication grating modulation is sent to photoelectric sensor, described photoelectric sensor is converted to the signal of telecommunication with the optical signal that receives, described acquisition module is periodically gathered the signal of telecommunication and is sent to position computation module, described position computation module is calculated the positional information of the relative scale grating of indication grating and is deposited described positional information in memory module according to the signal of telecommunication of current reception, described error detection module obtains difference information by the positional information of the current storage area in the memory module and the positional information of last storage area are done to take absolute value after the difference; If difference information, judges then that the positional information of current storage area is unreliable greater than threshold value, described correction module dopes reliable positional information according to last storage area to all positional informations of first storage area; And deposit described reliable positional information in the memory module current storage area.
Beneficial effect of the present invention: one, the present invention can detect the reliability of latest position information accurately according to the maximum operating speed of grating chi positional information calculation cycle, grating chi and the distance between the current positional information of obtaining and the previous position information;
If it is unreliable that the two current positional informations of obtaining are identified as, can predict according to passing repeatedly positional information, obtain positional information comparatively accurately.
Description of drawings
Fig. 1 is the structural representation of a kind of grating chi reading plotter of the present invention.
The specific embodiment
The specific embodiment one, in conjunction with Fig. 1 present embodiment is described, a kind of reading plotter of grating chi, present embodiment adopts the continuity between the adjacent reading of grating chi, by the distance between contrast current location information and the previous position information, judges whether current location information is reliable.If judge that current location information is unreliable, utilize old positional information to dope current location information, because grating chi peak acceleration in actual applications is a limited value, under very short situation of grating chi calculating location information cycle, the positional information that dopes has higher precision.This device comprises light source 1, scale grating 2, indication grating 3, photoelectric sensor 4 and reading module 5; Described reading module 5 comprises acquisition module 5-1, position computation module 5-2, memory module 5-3, error detection module 5-4 and correction module 5-5; Optical signal after the light that photoelectric sensor 4 reception light sources 1 send is modulated through scale grating 2, indication grating 3 also is converted into the signal of telecommunication, acquisition module 5-1 in the reading module 5 gathers this signal of telecommunication with some cycles, position computation module 5-2 calculates current indication grating 3 according to this signal of telecommunication and is positioned position on the scale grating 2, is called positional information; Memory module 5-4 records adjacent N reading, and after all memory blocks in memory module 5-4 were all filled up by positional information, error detection module 5-3 was with the positional information D in N memory block among the memory module 5-4
nWith the positional information D in N-1 the memory block
N-1A does difference and takes absolute value and obtaining A as a result, if, so just can think current location information D greater than certain threshold value B
nUnreliable, correction module 5-5 will be according to D
N-1～D
1And the information of utilizing prediction to make new advances, as up-to-date current location information, and leaving N the storage area of memory module 5-4 in, described N is positive integer.
The described position computation module 5-2 of present embodiment is with fixing computation of Period positional information; The current positional information of obtaining of described memory module 5-4 leaves N memory block in and also the positional information of original N memory block is moved in N-1 the memory block, the positional information of original N-1 memory block is moved in N-2 the memory block, and by that analogy; If the distance in the memory module between the current positional information of obtaining and the previous position information surpasses a certain threshold value, error detection module thinks that the current positional information of obtaining is unreliable; Described more than or equal to the grating chi maximum operating speed of setting and the product in acquisition module 5-1 collection signal of telecommunication cycle.
The specific embodiment two, present embodiment are the embodiment of the reading plotter of the specific embodiment one described a kind of grating chi:
The described light source 1 of present embodiment, indication grating 3, photoelectric sensor 4 are fixed the mutual alignment to each other, and indication grating 3 and scale grating 2 can motions mutually on the x direction.Optical signal after the light that photoelectric sensor 4 reception light sources 1 send is modulated through scale grating 2, indication grating 3 also is converted into the signal of telecommunication, and the acquisition module 5-1 in the reading module 5 gathers this signal of telecommunication with some cycles, and in the present embodiment, this cycle is 1 μ s; Position computation module 5-2 calculates current indication grating 3 according to this signal of telecommunication and is positioned position on the scale grating 2, is called positional information; Memory module 5-4 records adjacent N positional information, and after each position computation module 5-2 calculated current location information, memory module 5-4 can leave this positional information in N storage area, and with the positional information D of original N storage area
nMove in N-1 the storage area, with the positional information D of original N-1 storage area
N-1Move in N-2 the storage area, and by that analogy, in the present embodiment, N=3; After all memory blocks in memory module 5-4 were all filled up by positional information, error detection module 5-3 was with the positional information D in N storage area among the memory module 5-4
nWith the positional information D in N-1 the storage area
N-1Do difference and take absolute value and obtaining A as a result, if A greater than certain threshold value B, B=4 μ m in the present embodiment so just can think current location information D
nUnreliable, correction module 5-5 will be according to D
N-1～D
1And the D that utilizes prediction to make new advances
n *, as latest position information, and leaving N the storage area of memory module 5-4 in, the Forecasting Methodology of Cai Yonging is linear prediction in the present embodiment, if namely | D
n～D
N-1| 4 μ m, D
n *=2 * D
N-1-D
N-2
In the present embodiment, for machining, the movement velocity of each can not surpass 3m/s usually.The grating chi updating location information cycle is 1 μ s, distance between so adjacent twice positional information should be less than 4 μ m, therefore the error detection module 5-4 in the present embodiment can detect the mistake of grating chi in the work engineering, for machining, the acceleration of each can not surpass 30m/s usually
2, calculate the new positional information D that obtains according to the correction module 5-5 described in the present embodiment thus
n *, error range is at ± 15nm.
This shows, by present embodiment, can well improve the reliability of grating chi; Present embodiment equally also can be used on the angular encoder.
Claims (5)
1. the reading plotter of a grating chi, comprise light source (1), scale grating (2), indication grating (3), photoelectric sensor (4) and reading module (5), described reading module (5) comprises acquisition module (5-1), position computation module (5-2), memory module (5-4), error detection module (5-3) and correction module (5-5); The light that described light source (1) sends optical signal after scale grating (2) and indication grating (3) modulation is sent to photoelectric sensor (4), described photoelectric sensor (4) is converted to the signal of telecommunication with the optical signal that receives, it is characterized in that, described acquisition module (5-1) is periodically gathered the signal of telecommunication and is sent to position computation module (5-2), described position computation module (5-2) is calculated the positional information of the relative scale grating (2) of indication grating (3) and is deposited described positional information in memory module (5-4) according to the signal of telecommunication of current reception, described error detection module (5-3) obtains difference information by the positional information of the current storage area in the memory module (5-4) and the positional information of last storage area are done to take absolute value after the difference; If difference information, judges then that the positional information of current storage area is unreliable greater than threshold value, described correction module (5-5) dopes reliable positional information according to last storage area to all positional informations of first storage area; And deposit described reliable positional information in the memory module (5-4) current storage area.
2. the reading plotter of a kind of grating chi according to claim 1, it is characterized in that, described memory module (5-4) leaves the current positional information of obtaining in N storage area, and original positional information in N the storage area moved to N-1 storage area, original positional information in N-1 the storage area is moved to storage successively in N-2 the memory block.
3. the reading plotter of a kind of grating chi according to claim 1 is characterized in that, described reliable positional information, the method for employing linear prediction of doping.
4. the reading plotter of a kind of grating chi according to claim 1 is characterized in that, described position computation module (5-2) is with the computation of Period positional information identical with acquisition module (5-1).
5. the reading plotter of a kind of grating chi according to claim 1 is characterized in that, described threshold value is gathered the product in signal of telecommunication cycle more than or equal to the grating chi maximum operating speed of setting and acquisition module (5-1).
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| CN201310207142.0A CN103273382B (en) | 2013-05-30 | 2013-05-30 | Reading device of grating ruler |
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| CN201310207142.0A CN103273382B (en) | 2013-05-30 | 2013-05-30 | Reading device of grating ruler |
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| CN103273382B CN103273382B (en) | 2015-06-10 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103940347A (en) * | 2014-04-25 | 2014-07-23 | 浙江大学 | Fault detecting device for incremental grating ruler and detecting method thereof |
| CN104234728A (en) * | 2014-09-23 | 2014-12-24 | 中国矿业大学 | Automatic dismounting device for all hydraulic single prop |
| CN107379290A (en) * | 2016-05-11 | 2017-11-24 | 株式会社迪思科 | Topping machanism |
| CN107702647A (en) * | 2017-11-02 | 2018-02-16 | 长光（沧州）光栅传感技术有限公司 | Grating scale position reading out device |
| CN108453913A (en) * | 2018-05-28 | 2018-08-28 | 邢台晶龙电子材料有限公司 | Diamond wire cutting machine alignment device and application method |
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| CN1858557A (en) * | 2006-02-13 | 2006-11-08 | 广州市诺信数字测控设备有限公司 | Grating ruler and its reading method |
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| DE102008022027A1 (en) * | 2008-05-02 | 2009-11-05 | Dr. Johannes Heidenhain Gmbh | Position measuring device |
| CN201629091U (en) * | 2009-10-19 | 2010-11-10 | 南京日上自动化设备有限责任公司 | Multifunctional grating signal processing device of numerically controlled machine for teaching |
| CN102873586A (en) * | 2012-08-28 | 2013-01-16 | 中国科学院长春光学精密机械与物理研究所 | Fast on-line measuring device for curvature radius of workpiece processed in numerically controlled manner |
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| CN1858557A (en) * | 2006-02-13 | 2006-11-08 | 广州市诺信数字测控设备有限公司 | Grating ruler and its reading method |
| CN201012415Y (en) * | 2007-01-24 | 2008-01-30 | 山东济宁博特精密丝杠有限公司 | Digital intelligent feedback thread grinding and compensating gear |
| JP2008264954A (en) * | 2007-04-23 | 2008-11-06 | Ko Yamagishi | Tool and correction method of tool |
| DE102008022027A1 (en) * | 2008-05-02 | 2009-11-05 | Dr. Johannes Heidenhain Gmbh | Position measuring device |
| CN201629091U (en) * | 2009-10-19 | 2010-11-10 | 南京日上自动化设备有限责任公司 | Multifunctional grating signal processing device of numerically controlled machine for teaching |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103940347A (en) * | 2014-04-25 | 2014-07-23 | 浙江大学 | Fault detecting device for incremental grating ruler and detecting method thereof |
| CN103940347B (en) * | 2014-04-25 | 2016-06-15 | 浙江大学 | Increment type grating scale failure detector and detection method thereof |
| CN104234728A (en) * | 2014-09-23 | 2014-12-24 | 中国矿业大学 | Automatic dismounting device for all hydraulic single prop |
| CN107379290A (en) * | 2016-05-11 | 2017-11-24 | 株式会社迪思科 | Topping machanism |
| CN107379290B (en) * | 2016-05-11 | 2020-11-13 | 株式会社迪思科 | Cutting device |
| CN107702647A (en) * | 2017-11-02 | 2018-02-16 | 长光（沧州）光栅传感技术有限公司 | Grating scale position reading out device |
| CN108453913A (en) * | 2018-05-28 | 2018-08-28 | 邢台晶龙电子材料有限公司 | Diamond wire cutting machine alignment device and application method |
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| CN103273382B (en) | 2015-06-10 |
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