CN108168438B - Closed grating - Google Patents
Closed grating Download PDFInfo
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- CN108168438B CN108168438B CN201711460486.7A CN201711460486A CN108168438B CN 108168438 B CN108168438 B CN 108168438B CN 201711460486 A CN201711460486 A CN 201711460486A CN 108168438 B CN108168438 B CN 108168438B
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- grating
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- conductive layer
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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
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
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- General Physics & Mathematics (AREA)
- Length-Measuring Instruments Using Mechanical Means (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
The application discloses closed grating chi includes: a housing; an end cap; a scale grating fixed on the inner surface of the housing; a discharge element formed by plating a conductive material on an upper surface of the scale grating; a conductive element connected to the discharge element for discharging electric charges; the conductive element comprises a conductive sheet and a conductive layer arranged on the surface of the conductive sheet; the conductive layer is made of a conductive material with preset resistivity; a reading head assembly positioned on the lower surface of the scale grating; the reading head assembly comprises a sliding frame and a sliding frame body which penetrates through the shell and drives the sliding frame to move. Therefore, the surface of the conducting strip of the conducting element is provided with the conducting layer made of the conducting material with the preset resistivity, and charges generated in the working process of the grating ruler are slowly led out; moreover, the conductive layer can effectively avoid the influence on the grating ruler caused by the fact that large current or high voltage generated by the outside is transmitted to the inside of the grating ruler through the shell, namely, the influence of external charges is avoided.
Description
Technical Field
The invention relates to the technical field of machinery, in particular to a closed grating.
Background
The grating ruler is a device for measuring the linear position by utilizing the optical principle of the grating, and is widely applied to the fields of precision measurement and automatic control due to the characteristics of high measurement precision, economy, reliability and the like. In the prior art, a grating scale is usually manufactured into a closed grating scale, which is a device for detecting linear displacement, and is mainly applied to machine tool equipment for detecting position changes of a workbench or a main shaft of a machine tool.
However, the closed grating ruler in the prior art is usually provided with a hollow aluminum casing with an opening in the length direction, two ends of the casing are sealed by end covers, and then sealing strips are used in a matching manner, so that the grating ruler, a reading head, a scanning unit and the like in the casing structure of the ruler are protected from being polluted by iron chips, dust and splashing water. In order to further ensure the surface cleanliness of the grating ruler, the end cover is provided with a vent hole, and dust in the ruler shell is blown out by introducing clean air with certain pressure into the ruler shell.
However, in the working process of the grating ruler, charges generated by the glass scale grating and the reading head in the reciprocating process are accumulated on the surface of the scale grating, and the scale grating sealed in the ruler shell needs to be electrically connected with the shell or the end cover by arranging a conductive element to lead out the charges. The conductive element of the closed grating ruler provided in the prior art is usually made of a metal sheet, and although the conductive element made of the metal sheet can lead out charges generated in the reciprocating process of the glass grating ruler and the reading head, the metal sheet has excellent conductivity and is very easily interfered by external charges, for example, current generated by high voltage is transmitted into the grating ruler to cause interference on the measurement of the grating ruler or damage to the grating ruler.
Therefore, how to manufacture a grating ruler that is not affected by external charges is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a closed grating ruler, which is not affected by external charges. The specific scheme is as follows:
an enclosed grating, comprising:
a housing;
the end covers are positioned at two ends of the shell and are provided with positioning holes;
a scale grating fixed to an inner surface of the housing;
a discharge element formed by plating a conductive material on an upper surface of the scale grating;
the conductive element is overlapped with the discharge element, is fixed on the inner surface of the end cover through a buckle and is used for leading out electric charges; the conductive element comprises a conductive sheet and a conductive layer arranged on the surface of the conductive sheet; the conductive layer is made of a conductive material with preset resistivity;
a reading head assembly located on the lower surface of the scale grating; the reading head assembly comprises a sliding frame which is in direct contact with the lower surface of the scale grating and a sliding frame body which penetrates through the shell and drives the sliding frame to move.
Preferably, the discharge element comprises a discharge element formed of a chromium material in the length direction of the scale grating.
Preferably, the conductive sheet comprises an elastic conductive sheet formed using metal.
Preferably, the conductive layer includes a conductive layer formed using a conductive rubber.
Preferably, the conductive layer formed by the conductive rubber is positioned on the surface of the elastic conductive sheet by a vulcanization method.
Preferably, the catch comprises a resilient catch.
Preferably, the closed grating further comprises:
and the screw is used for realizing the connection of the conductive element and the end cover.
Preferably, the end cap further comprises:
the air vent is arranged and used for guiding the air to flow to the arc-shaped guide boss.
The invention provides a closed grating ruler, comprising: a housing; end covers which are positioned at two ends of the shell and are provided with positioning holes; a scale grating fixed on the inner surface of the housing; a discharge element formed by plating a conductive material on an upper surface of the scale grating; the conductive element is overlapped with the discharge element, is fixed on the inner surface of the end cover through a buckle and is used for leading out electric charges; the conductive element comprises a conductive sheet and a conductive layer arranged on the surface of the conductive sheet; the conductive layer is made of a conductive material with preset resistivity; a reading head assembly positioned on the lower surface of the scale grating; the reading head assembly comprises a sliding frame which is directly contacted with the lower surface of the scale grating and a sliding frame body which penetrates through the shell and drives the sliding frame to move. According to the technical scheme provided by the invention, the conductive layer made of the conductive material with the preset resistivity is arranged on the surface of the conductive sheet of the conductive element, and the charges generated in the movement process of the glass grating and the reading head are slowly led out; in addition, the conducting layer with the preset resistivity can effectively avoid the interference or damage to the grating ruler caused by the fact that large current or high voltage generated by the outside is transmitted to the inside of the grating ruler through the shell, namely, the conducting layer is not influenced by external charges.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a closed grating ruler according to an embodiment of the present invention;
fig. 2 is a bottom view of a scale grating of the enclosed grating ruler according to the embodiment of the present invention;
fig. 3 is a schematic structural diagram of a closed type grating scale before being assembled according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an end cover of a closed grating scale according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a closed grating ruler, the structural schematic diagram of which is shown in figure 1, comprising:
a housing 1; end covers 2 which are positioned at two ends of the shell and are provided with positioning holes; a scale grating 3 fixed to the inner surface of the housing 1; a discharge element 4 formed by plating a conductive material on the upper surface of the scale grating 3; a conductive element 6 which is overlapped with the discharge element 4 and is fixed on the inner surface of the end cover through a buckle 5 and is used for leading out electric charge; the conductive element 6 comprises a conductive sheet 61 and a conductive layer 62 arranged on the surface of the conductive sheet; the conductive layer 62 is a conductive layer made of a conductive material having a predetermined resistivity; a reading head assembly 7 located on the lower surface of the scale grating 3; the reading head assembly 7 includes a carriage 71 directly contacting the lower surface of the scale grating 3, and a carriage body 72 passing through the housing and driving the carriage to move.
The housing 1 of the closed type grating ruler is usually made of an aluminum material, but may be made of other materials if necessary. The scale grating 3 is fixed on the shell 1 and is in close contact with the sliding frame 71, two ends of the shell 1 are sealed by the end covers 2 to form a scale shell structure, and the scale shell structure is fixed with the equipment installation surface. In the embodiment of the present invention, the discharge element 4 formed by plating the conductive material on the upper surface of the scale grating 3 is typically made of a chromium material, and can be specifically seen in fig. 2.
In the embodiment of the invention, the sliding frame 71 and the sliding frame body 72 are assembled through a spring to form a reading head assembly, the whole reading head assembly is movably assembled in a ruler shell structure and structurally sealed by using a sealing strip 8, and the reading head assembly is installed with the equipment moving workbench through screws, as shown in fig. 3. When the device works, the movement of the movable workbench relative to the device installation surface is converted into the movement of the scale grating 3 relative to the indicating grating arranged on the sliding frame 71, the relative movement of the two gratings forms light and dark stripes, the light and dark stripes are converted into electric signals through the photoelectric conversion device, and the electric signals are output to the signal processing unit, so that the linear position measurement is realized. The ruler shell structure is sealed by the sealing strip to form a closed structure, so that the grating ruler 3, the reading head assembly 7, the scanning unit and the like in the ruler shell structure are protected from being polluted by scrap iron, dust and splashing water, the signal quality is ensured, and the measuring precision and accuracy are ensured.
Due to the influence of an external electric field, the difference of the electric conductivity coefficients of materials which rub against each other in the relative movement process and the like, potential difference may exist on the surface of the scale grating 3, so that pulse type discharge is caused, and the pulse type discharge interferes with a scanning signal, so that measurement errors are caused. In order to conduct the electrical charges on the surface of the scale grating 3, a conductive layer, typically chromium, i.e. the discharge element 4, is plated in the longitudinal direction of the scale grating 3 with a conductive material. The conductive element 6 is tightly contacted with the discharge element 4 and is tightly pressed with the end cover 1 through a screw to establish electric connection, so that the function of leading out electric charge is realized, and scanning signals are not interfered.
Specifically, the conductive element 6 includes a conductive sheet 61 and a conductive layer 62 disposed on a surface of the conductive sheet; the conductive layer 62 is a conductive layer made of a conductive material having a predetermined resistivity. The metal sheet is used as a framework of the conductive element 6, and the conductive layer 61 is usually made of synthetic conductive rubber with a certain resistivity and vulcanized on the surface of the metal. The metal sheet is used as a framework of the conductive element 6 to ensure that the metal sheet has certain rigidity and keeps certain pressure when contacting with the discharge element 4, so that the metal sheet and the discharge element are always in close lap joint in the movement process, the conductive layer 62 made of conductive rubber is connected with the discharge element 4 and is responsible for slowly leading out accumulated charges, and the charges are released by grounding the shell of the grating ruler. Meanwhile, the conductive rubber structure with certain resistivity effectively avoids the damage caused by the fact that large current or high voltage generated by the outside is transmitted to the inside of the grating ruler through the shell. The above-mentioned snap 5 for fixing the conductive element 6 may be an elastic snap.
In order to clean up impurities such as dust entering the grating ruler in time, the closed grating ruler provided by the embodiment of the invention further comprises: the air vent is arranged and used for guiding the air to flow to the arc-shaped guide boss. Clean air with certain pressure is led into the ruler shell through the end covers 2 at the two ends, and dust in the ruler shell is brought out through the closing of the sealing strips. The specific structure is shown in fig. 4, and the arrows in the figure indicate the flow direction of air. As shown in fig. 4: one end of the end cover 2 is provided with an arc-shaped guide boss, the arc-shaped structural design ensures that the sealing strip is naturally attached to the end cover, and the sealing effect is better; set up the air vent in the direction boss, water conservancy diversion piece when the end of air vent, clean air shunts toward both sides when passing through the water conservancy diversion piece, blows the sealing strip surface perpendicularly, and clean effect is better. The other end of the end cover 2 is provided with an elastic buckle which can realize positioning with a clamping groove on the shell 1, and meanwhile, the conductive element 6 is arranged in the elastic buckle, so that the end cover is fixed by a screw in a pressing way, and meanwhile, the conductive element 6 is electrically connected with the end cover 2, and the convenience and the rapidness are realized.
According to the technical scheme provided by the invention, the conductive layer made of the conductive material with the preset resistivity is arranged on the surface of the conductive sheet of the conductive element, and the charges generated in the moving process of the glass grating and the reading head are slowly led out; in addition, the conducting layer with the preset resistivity can effectively avoid the interference or damage to the grating ruler caused by the fact that large current or high voltage generated by the outside is transmitted to the inside of the grating ruler through the shell, namely, the conducting layer is not influenced by external charges.
In addition, the guide boss structure on the end cover is designed into an arc shape, so that the sealing strip is installed in a positioning mode, the sealing strip is tightly attached to the sealing strip, and the sealing effect is better. And, the air vent end sets up the water conservancy diversion hole, shunts the direction to the clean air through the air vent, makes it blow to the sealing strip surface perpendicularly, and clean effect is better. The elastic buckle structure on the end cover is connected and matched with the screw, so that the positioning and guiding between the end cover and the shell are realized, and meanwhile, the electric connection between the conductive element and the end cover is established, so that the closed grating ruler has a simple and reliable structure.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The closed type grating ruler provided by the invention is described in detail above, a specific example is applied in the text to explain the principle and the implementation mode of the invention, and the description of the above embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (8)
1. An enclosed grating, comprising:
a housing;
the end covers are positioned at two ends of the shell and are provided with positioning holes;
a scale grating fixed to an inner surface of the housing;
a discharge element formed by plating a conductive material on an upper surface of the scale grating;
the conductive element is overlapped with the discharge element, is fixed on the inner surface of the end cover through a buckle and is used for leading out electric charges; the conductive element comprises a conductive sheet and a conductive layer arranged on the surface of the conductive sheet; the conductive layer is made of a conductive material with preset resistivity;
a reading head assembly located on the lower surface of the scale grating; the reading head assembly comprises a sliding frame which is in direct contact with the lower surface of the scale grating and a sliding frame body which penetrates through the shell and drives the sliding frame to move.
2. The enclosed grating of claim 1, wherein the discharge element comprises a discharge element formed from a chromium material in a length direction of the scale grating.
3. The enclosed grating of claim 1, wherein the conductive sheet comprises an elastic conductive sheet formed using metal.
4. The enclosed grating of claim 3, wherein the conductive layer comprises a conductive layer formed using a conductive rubber.
5. The enclosed grating of claim 4, wherein the conductive layer formed of the conductive rubber is disposed on the surface of the elastic conductive sheet by a vulcanization method.
6. The enclosed grating of claim 1, wherein the snap comprises an elastic snap.
7. The enclosed grating of claim 1, further comprising:
and the screw is used for realizing the connection of the conductive element and the end cover.
8. The enclosed grating of any one of claims 1 to 7, wherein the end cap further comprises:
the air vent is arranged and used for guiding the air to flow to the arc-shaped guide boss.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711460486.7A CN108168438B (en) | 2017-12-28 | 2017-12-28 | Closed grating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711460486.7A CN108168438B (en) | 2017-12-28 | 2017-12-28 | Closed grating |
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| Publication Number | Publication Date |
|---|---|
| CN108168438A CN108168438A (en) | 2018-06-15 |
| CN108168438B true CN108168438B (en) | 2020-02-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711460486.7A Active CN108168438B (en) | 2017-12-28 | 2017-12-28 | Closed grating |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110542383B (en) * | 2019-09-29 | 2021-06-25 | 长春禹衡光学有限公司 | Grating ruler |
| CN110542384A (en) * | 2019-09-29 | 2019-12-06 | 长春禹衡光学有限公司 | Grating ruler |
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| EP2071612A1 (en) * | 2006-08-31 | 2009-06-17 | Nikon Corporation | Mobile body drive method and mobile body drive system, pattern formation method and apparatus, exposure method and apparatus, and device manufacturing method |
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| CN104713484A (en) * | 2015-03-09 | 2015-06-17 | 北京奥特普森精密机械有限公司 | Closed type optical grating linear displacement sensor structure for ultra-precise machine tool |
| CN105509919A (en) * | 2015-11-30 | 2016-04-20 | 中冶赛迪电气技术有限公司 | Multi-wire system thermocouple and thermocouple charge accumulation preventing method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI245114B (en) * | 2004-10-11 | 2005-12-11 | Ind Tech Res Inst | Apparatus for measuring imaging spectrograph |
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2017
- 2017-12-28 CN CN201711460486.7A patent/CN108168438B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1659752A (en) * | 2002-06-13 | 2005-08-24 | 英特尔公司 | Method and apparatus for tunable wavelength conversion using a Bragg grating and a laser in a semiconductor substrate |
| CN1479370A (en) * | 2002-08-26 | 2004-03-03 | 日月光半导体制造股份有限公司 | Package substrate with electrostatic discharge protection |
| EP2071612A1 (en) * | 2006-08-31 | 2009-06-17 | Nikon Corporation | Mobile body drive method and mobile body drive system, pattern formation method and apparatus, exposure method and apparatus, and device manufacturing method |
| CN101274775A (en) * | 2008-05-21 | 2008-10-01 | 中国科学院长春应用化学研究所 | A kind of high-conductivity aluminum-doped zinc oxide nanopowder and preparation method thereof |
| CN103335597A (en) * | 2013-07-02 | 2013-10-02 | 中国科学院长春光学精密机械与物理研究所 | Grating ruler photoelectric sensor |
| CN104713484A (en) * | 2015-03-09 | 2015-06-17 | 北京奥特普森精密机械有限公司 | Closed type optical grating linear displacement sensor structure for ultra-precise machine tool |
| CN105509919A (en) * | 2015-11-30 | 2016-04-20 | 中冶赛迪电气技术有限公司 | Multi-wire system thermocouple and thermocouple charge accumulation preventing method |
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| CN108168438A (en) | 2018-06-15 |
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