CN111198383A - Laser ruler - Google Patents
Laser ruler Download PDFInfo
- Publication number
- CN111198383A CN111198383A CN202010076956.5A CN202010076956A CN111198383A CN 111198383 A CN111198383 A CN 111198383A CN 202010076956 A CN202010076956 A CN 202010076956A CN 111198383 A CN111198383 A CN 111198383A
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- China
- Prior art keywords
- laser
- origin detection
- light path
- original point
- air guide
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- 238000001514 detection method Methods 0.000 claims abstract description 78
- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 5
- 230000000712 assembly Effects 0.000 abstract description 4
- 238000000429 assembly Methods 0.000 abstract description 4
- 230000001681 protective effect Effects 0.000 abstract description 4
- 230000001960 triggered effect Effects 0.000 abstract description 2
- 239000012535 impurity Substances 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- TUVQIHHKIZFJTE-UHFFFAOYSA-N [N].[Ne] Chemical compound [N].[Ne] TUVQIHHKIZFJTE-UHFFFAOYSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004471 energy level splitting Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- CPBQJMYROZQQJC-UHFFFAOYSA-N helium neon Chemical compound [He].[Ne] CPBQJMYROZQQJC-UHFFFAOYSA-N 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a laser ruler, which comprises a laser head, a reflector component, a light path protective cover for protecting a light path between the laser head and the reflector component, and further comprises: the trigger structure is arranged on the light path protection cover and comprises at least one origin detection component and a trigger structure for triggering the origin detection component; the origin detection unit includes: the trigger structure is fixed on the reflector component and moves along with the reflector component, and when the trigger structure passes through the space between the transmitting end of the original point signal and the receiving end of the original point signal, the zero point detection signal is triggered. The invention adopts the structure that the transmitting end of the original point signal and the receiving end of the original point signal are matched with each other, no mechanical collision exists in the triggering process, the original point detection assembly can be arranged at a position close to the laser head and is in the same temperature field with the laser head, the error is small, the precision is high, and the two original point detection assemblies can be matched for use to perform precision compensation.
Description
Technical Field
The invention relates to a laser ruler.
Background
The laser ruler is used for measuring the distance of a target by utilizing laser, and has good application in the field of machine tools. The mode that sets up mechanical trigger switch as the initial point switch exists among the prior art, and mechanical trigger switch's triggering needs mechanical structure's touching process, and the vibrations that the touching process produced can bring harmful effects to equipment, need set up mechanical trigger switch in the position apart from the laser ruler certain distance, and this kind of mode receives environmental factor influences such as temperature great, and positioning accuracy is relatively poor, influences machine tool machining precision.
Disclosure of Invention
The invention aims at solving the problems and researches and designs a laser ruler. The technical means adopted by the invention are as follows:
the utility model provides a laser ruler, includes laser head, mirror assembly and is used for protecting the light path safety cover of light path between laser head and the mirror assembly, still includes:
the trigger structure is arranged on the light path protection cover and comprises at least one origin detection component and a trigger structure for triggering the origin detection component;
the origin detection unit includes: the trigger structure is fixed on the reflector component, moves along with the reflector component, and triggers a zero detection signal when the trigger structure passes between the transmitting end of the original point signal and the receiving end of the original point signal.
Preferably, the number of origin detection subassembly is two, and first origin detection subassembly is located the light path safety cover with the one end that the laser head is connected, the distance between second origin detection subassembly and the first origin detection subassembly is reference length.
Preferably, the light path safety cover includes shell and laser passageway, the shell is half surrounding structure, the laser passageway is located in the shell, mirror assembly is in the laser passageway removes, the opening part of shell is equipped with the brush, shell and brush form seal structure.
Preferably, the shell comprises an air guide channel, the air guide channel is arranged along the laser channel, at least one air inlet hole is formed in the air guide channel and communicated with the air guide channel and the laser channel, one end of the air guide channel is sealed, and the other end of the air guide channel is connected with a positive pressure air source.
Compared with the prior art, the laser ruler has the following advantages:
1. the transmitting end of the original point signal and the receiving end of the original point signal are matched with the trigger structure, so that the precision is high and the positioning is accurate;
2. the original point detection assembly is free of mechanical collision in the triggering process, can be arranged at a position close to the laser head and is in the same temperature field with the laser head, so that the error is small and the accuracy is high;
3. two origin detection components can be used in cooperation for precision compensation.
Drawings
FIG. 1 is a schematic view of the overall installation of the present invention;
FIG. 2 is a schematic view of the entire structure of the origin detecting unit according to the present invention;
FIG. 3 is a schematic rear view of the origin detection assembly of FIG. 2;
FIG. 4 is a schematic side view of the raw point detection assembly of FIG. 2;
FIG. 5 is a schematic cross-sectional view taken along the line A-A in FIG. 4;
in the figure, 1, a laser head; 2. a mirror assembly; 3. a light path protective cover; 4. an origin detection component; 5. a brush; 6. a machine tool slide plate frame; 7. a gantry beam; 8. a gantry side wall; 9. a trigger structure; 21. a mirror; 22. a reflector base; 41. an origin signal transmitting end; 42. a receiving end of the origin signal; 43. a first origin detection component; 44. a second origin detection component; 31 a housing; 32. a laser channel; 33. an air guide channel; 34. and (4) air inlet holes.
Detailed Description
As shown in fig. 1-5, a laser ruler applied to a gantry machine tool, wherein the installation relationship of the laser ruler relative to a gantry cross beam 7 and a gantry side wall 8 in the gantry machine tool is shown in fig. 1. The laser ruler comprises a laser head 1, a reflector component 2, a light path protection cover 3 used for protecting a laser light path between the laser head 1 and the reflector component 2, at least one original point detection component 4 arranged on the light path protection cover 3, and a trigger structure 9 for triggering the original point detection component 4, wherein the light path protection cover 3 is installed along the moving direction of a gantry beam 7 on a machine tool guide rail.
The laser head 1 adopts a double-frequency laser interference principle, and generally, a single-frequency nitrogen-neon laser is placed in an axial magnetic field to become a double-frequency helium-neon laser. Due to the zeeman effect (energy level splitting and spectral line splitting caused by additional energy obtained by particles by an external magnetic field), the spectral line of the laser is split into two circularly polarized lights with opposite rotation directions in the magnetic field, so that the dual-frequency laser with two frequencies is obtained. For dual-frequency laser interference, an alternating current amplifier with a large amplification factor can be used for amplifying an interference signal, so that even if the light intensity is attenuated by 90%, a proper electric signal can be obtained. Dual frequency laser interference can be used to measure length, as well as small angles directly.
The origin detection unit 4 includes a transmission terminal 41 for transmitting the origin signal and a reception terminal 42 for receiving the origin signal of the signal. The light path between the laser head 1 and the reflector component 2 is along the moving direction of the gantry beam 7 on the machine tool guide rail, and the light path between the transmitting end 41 of the original point signal and the receiving end 42 of the original point signal is perpendicular to the moving direction of the gantry beam 7 on the machine tool guide rail. The receiving end 42 of the origin signal continuously receives the laser signal emitted from the emitting end 41 of the origin signal. The trigger structure 9 is fixedly connected to the mirror assembly 2 and moves with the mirror assembly 2 within the light path protective cover 3. When the trigger structure 9 passes through the laser transmission channel between the emitting end 41 of the original point signal and the receiving end 42 of the original point signal, the trigger structure 9 blocks the transmission of the laser signal, the light intensity at the receiving end 42 of the original point signal is weakened, a zero point detection signal is sent to the controller, and the current position is recorded as the original point position.
When the traditional mechanical trigger switch is used, an impact force is generated on the switch, the switch can be deformed at the moment, and the original point positioning can deviate relative to an actual value. This laser chi adopts the transmitting terminal 41 of laser initial point signal and the receiving terminal 42 cooperation trigger structure 9 of initial point signal, and trigger structure 9 can adopt bar-like isotructure form, and the process of triggering does not have mechanical collision, and initial point determine module 4 can set up in the position that is close to the laser chi, and is in same temperature field with the laser chi, and the error is little, and the precision is high. And the installation origin detection assembly does not occupy additional positions, so that the layout of the machine tool is simpler.
Further, the number of the origin detection units 4 is two, and the number is the first origin detection unit 43 and the second origin detection unit 44, and the first origin detection unit 43 and the second origin detection unit 44 have the same composition structure. The first origin detection component 43 is installed at one end of the optical path protection cover 3 connected with the laser head 1, and the second origin detection component 44 is installed at a reference length position on the optical path protection cover 3 from the first origin detection component 43. The "reference length" refers to the ratio of the distance between the first origin detection unit 43 and the second origin detection unit 44 to the total length of the machine tool guide rail, and can be selected according to actual conditions. In this embodiment, the second origin detection unit 44 is disposed at the middle of the machine tool guide rail, and the reference length is half of the total length of the machine tool guide rail.
Since the laser head 1 or the connection structure between the laser head 1 and the first origin detection assembly 43 is deformed when being heated or cooled, an error is brought to position detection. Therefore, the first original point detection assembly 43 is matched with the laser head 1 for use, the distance between the first original point detection assembly 43 and the laser head 1 is unlimited and close, the temperature field of the first original point detection assembly 43 is guaranteed to be consistent with the temperature field of the laser head 1 as far as possible, and therefore the detection accuracy is improved.
The reflecting mirror assembly 2 comprises a reflecting mirror 21 and a reflecting mirror seat 22, the reflecting mirror seat 22 is connected with a machine tool slide plate frame 6, the machine tool slide plate frame 6 drives the reflecting mirror assembly 2 to move in the light path protective cover 3, and the position of the reflecting mirror assembly 2 corresponds to the position of the machine tool slide plate frame 6.
When the mirror assembly 2 starts to move from the laser head 1, the distance between the mirror assembly 2 and the laser head 1 gradually increases, and the mirror assembly 2 sequentially passes through the first origin detection assembly 43 and the second origin detection assembly 44. When the mirror assembly 2 passes through the first origin detection assembly 43, the trigger structure 9 passes between the transmitting end 41 of the origin signal of the first origin detection assembly 43 and the receiving end 42 of the origin signal, and triggers the zero point detection signal, and the position of the first origin detection assembly 43 is taken as the origin position of the movement of the mirror assembly 2. During movement of the mirror assembly 2 from the first origin detection assembly 43 to the second origin detection assembly 44, the position of the mirror assembly 2 may be determined by the relative position of the mirror assembly 2 and the first origin detection assembly 43. When the mirror assembly 2 reaches the second origin detection assembly 44, the trigger structure 9 passes through between the transmitting end 41 of the origin signal of the second origin detection assembly 44 and the receiving end 42 of the origin signal, and triggers the zero point detection signal again, and at this time, the position of the second origin detection assembly 44 is used as the origin position of the movement of the mirror assembly 2. After the mirror assembly 2 passes the second origin detection assembly 44, the position of the mirror assembly 2 may be determined by the relative position of the mirror assembly 2 and the second origin detection assembly 44.
When the mirror assembly 2 starts to move from the end far away from the laser head 1, the distance between the mirror assembly 2 and the laser head 1 gradually becomes closer, and the mirror assembly 2 sequentially passes through the second origin detection assembly 44 and the first origin detection assembly 43. When the mirror assembly 2 passes the second origin detection assembly 44, a zero point detection signal is triggered, and the position of the second origin detection assembly 44 is taken as the origin position of the movement of the mirror assembly 2. During movement of the mirror assembly 2 from the second origin detection assembly 44 to the first origin detection assembly 43, the position of the mirror assembly 2 may be determined by the relative position of the mirror assembly 2 and the second origin detection assembly 44. When the mirror assembly 2 reaches the first origin detection assembly 43, the mirror assembly 2 starts to turn back, the position of which is determined in the above-mentioned manner.
The measured distance change between the first origin detection assembly 43 and the second origin detection assembly 44 at different ambient temperatures may provide compensation data for machine tool parameters. For example, the mounting distance (i.e., the reference length) between the two origin detection assemblies at an ambient temperature of 20 ℃ is taken as a standard value, when the ambient temperature changes, the distance between the two origin detection assemblies changes due to the deformation of the device, and the difference between the change value of the distance and the standard value is the deformation amount of the machine tool guide rail between the two origin detection assemblies. And because the distance between the second origin detection assembly 44 and the first origin detection assembly 43 is the reference length, when the deformation of the machine tool in the reference length is known, the deformation of the whole machine tool can be obtained by simple calculation, and the deformation can provide compensation parameters of distance change at different temperatures for the machine tool.
Further, the light path protection cover 3 comprises a shell 31 and a laser channel 32, the shell 31 is a semi-enclosed "C" shaped structure, the laser channel 32 is arranged in the shell 31, two sides of the opening of the shell 31 are both provided with brushes 5, and the shell 31 and the two layers of brushes 5 form a sealing structure together. When the mirror assembly 2 moves, the mirror 21 moves in the laser passage 32, and the mirror base 22 moves between the two layers of brushes 5. The brush 5 can isolate impurities, and can also clean the impurities adhered to the reflector seat 22, so as to prevent the impurities from entering the laser channel 32 and affecting the transmission of laser signals.
Further, the shell 31 further comprises an air guide channel 33, the air guide channel 33 is arranged along the laser channel 32, a plurality of air inlet holes 34 are formed in the air guide channel 33, the air inlet holes 34 are communicated with the air guide channel 33 and the laser channel 32, one end of the air guide channel 33 is sealed, and the other end of the air guide channel 33 is connected with the positive pressure fan. Because one end of the air guide channel 33 is closed, the positive pressure wind blown into the air guide channel 33 by the fan enters the laser channel 32 through the air inlet 34, so that the inside of the laser channel 32 maintains a positive pressure environment. At this time, the external pressure of the laser channel 32 is low, and impurities such as dust are not easy to enter the laser channel 32, so that the interference of the impurities on the laser signal transmission is avoided. Meanwhile, the positive pressure environment also plays a role in balancing a temperature field, and influence caused by deformation of the machine tool is reduced.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (4)
1. The utility model provides a laser ruler, includes laser head, reflector assembly and is used for protecting the light path safety cover of light path between laser head and the reflector assembly, its characterized in that: further comprising:
the trigger structure is arranged on the light path protection cover and comprises at least one origin detection component and a trigger structure for triggering the origin detection component;
the origin detection unit includes: the trigger structure is fixed on the reflector component, moves along with the reflector component, and triggers a zero detection signal when the trigger structure passes between the transmitting end of the original point signal and the receiving end of the original point signal.
2. A laser ruler according to claim 1 wherein: the quantity of initial point determine module is two, and first initial point determine module is located the light path safety cover with the one end that the laser head is connected, the distance between second initial point determine module and the first initial point determine module is reference length.
3. A laser ruler according to claim 2 wherein: the light path safety cover includes shell and laser passageway, the shell is half surrounding structure, the laser passageway is located in the shell, reflector component is in remove in the laser passageway, the opening part of shell is equipped with the brush, shell and brush form seal structure.
4. A laser ruler according to claim 3 wherein: the shell comprises an air guide channel, the air guide channel is arranged along the laser channel, at least one air inlet hole is formed in the air guide channel and communicated with the air guide channel and the laser channel, one end of the air guide channel is sealed, and the other end of the air guide channel is connected with a positive pressure air source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010076956.5A CN111198383A (en) | 2020-01-23 | 2020-01-23 | Laser ruler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010076956.5A CN111198383A (en) | 2020-01-23 | 2020-01-23 | Laser ruler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111198383A true CN111198383A (en) | 2020-05-26 |
Family
ID=70746608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010076956.5A Pending CN111198383A (en) | 2020-01-23 | 2020-01-23 | Laser ruler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111198383A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1290360A (en) * | 1969-01-23 | 1972-09-27 | ||
| US5724123A (en) * | 1995-06-22 | 1998-03-03 | Mitsubishi Denki Kabushiki Kaisha | Distance measuring equipment for detecting a scanning direction |
| JP2007301649A (en) * | 2006-05-09 | 2007-11-22 | Jtekt Corp | Tool measuring instrument of machine tool |
| JP2014163757A (en) * | 2013-02-22 | 2014-09-08 | Kyoto Univ | Spatial precision measuring method of machine tool and spatial precision measuring device |
| US20150094844A1 (en) * | 2013-10-02 | 2015-04-02 | Korea Institute Of Machinery & Materials | Built-in type vision based inspection tool for autonomous setting of initial origin |
| CN205537519U (en) * | 2016-01-27 | 2016-08-31 | 长安大学 | Portable laser measuring tape |
| CN106346315A (en) * | 2015-07-14 | 2017-01-25 | 发那科株式会社 | Machine tool control system capable of obtaining workpiece origin and workpiece origin setting method |
| CN107971830A (en) * | 2016-10-24 | 2018-05-01 | 德国波龙科技有限公司 | For measuring the measuring system of instrument in lathe |
| CN211979199U (en) * | 2020-01-23 | 2020-11-20 | 科德数控股份有限公司 | Laser ruler |
-
2020
- 2020-01-23 CN CN202010076956.5A patent/CN111198383A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1290360A (en) * | 1969-01-23 | 1972-09-27 | ||
| US5724123A (en) * | 1995-06-22 | 1998-03-03 | Mitsubishi Denki Kabushiki Kaisha | Distance measuring equipment for detecting a scanning direction |
| JP2007301649A (en) * | 2006-05-09 | 2007-11-22 | Jtekt Corp | Tool measuring instrument of machine tool |
| JP2014163757A (en) * | 2013-02-22 | 2014-09-08 | Kyoto Univ | Spatial precision measuring method of machine tool and spatial precision measuring device |
| US20150094844A1 (en) * | 2013-10-02 | 2015-04-02 | Korea Institute Of Machinery & Materials | Built-in type vision based inspection tool for autonomous setting of initial origin |
| CN106346315A (en) * | 2015-07-14 | 2017-01-25 | 发那科株式会社 | Machine tool control system capable of obtaining workpiece origin and workpiece origin setting method |
| CN205537519U (en) * | 2016-01-27 | 2016-08-31 | 长安大学 | Portable laser measuring tape |
| CN107971830A (en) * | 2016-10-24 | 2018-05-01 | 德国波龙科技有限公司 | For measuring the measuring system of instrument in lathe |
| CN211979199U (en) * | 2020-01-23 | 2020-11-20 | 科德数控股份有限公司 | Laser ruler |
Non-Patent Citations (1)
| Title |
|---|
| 王艳凤: "数控加工中心原点设置原理与常见故障分析", 《科技信息(科学教研)》, no. 33, 20 November 2007 (2007-11-20), pages 345 * |
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