CN116608771A - Laser length measuring instrument based on dynamic cold detection distance - Google Patents
Laser length measuring instrument based on dynamic cold detection distance Download PDFInfo
- Publication number
- CN116608771A CN116608771A CN202310540472.5A CN202310540472A CN116608771A CN 116608771 A CN116608771 A CN 116608771A CN 202310540472 A CN202310540472 A CN 202310540472A CN 116608771 A CN116608771 A CN 116608771A
- Authority
- CN
- China
- Prior art keywords
- cold
- unit
- length
- cold detection
- laser
- Prior art date
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 133
- 239000000463 material Substances 0.000 claims abstract description 73
- 238000012545 processing Methods 0.000 claims abstract description 31
- 238000005259 measurement Methods 0.000 claims description 71
- 238000000034 method Methods 0.000 claims description 16
- 230000033001 locomotion Effects 0.000 claims description 11
- 238000012360 testing method Methods 0.000 claims description 10
- 238000000691 measurement method Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 description 30
- 239000010959 steel Substances 0.000 description 30
- 238000007689 inspection Methods 0.000 description 10
- 230000005693 optoelectronics Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000004590 computer program Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- 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
- G01B11/04—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving
- G01B11/043—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving for measuring length
Abstract
The invention relates to a laser length measuring system based on dynamic cold detection distance, which comprises laser speed measuring units, cold detection units triggering the laser speed measuring units and data processing units communicated with the laser speed measuring units, wherein the number of the cold detection units is 3 or more than 3; the system also includes a cold check unit tracking module. The laser length measuring system based on the dynamic cold detection distance can dynamically configure the distance between the double cold detection, and simultaneously, the long material and the short material can obtain good measuring precision, and the measuring precision can reach an error range of +/-2 mm.
Description
Technical Field
The invention belongs to the field of metering equipment adopting an optical method as a characteristic, and particularly relates to a laser length measuring instrument special for measuring the length of an object during movement.
Background
A length measuring system for measuring the length of a steel plate with an online cold detection amount moving has been reported, for example, chinese patent CN 213021446U discloses a measuring tool for continuously casting on-line measuring the width of a hot billet, the patent adopts an electrical dimension measuring structure, and the related report also includes a mode of combining a plurality of groups of photoelectric switches and encoders when measuring cold billets, and a mode of combining two displacement sensors and a pressure detecting switch when measuring hot billets. However, in either way, existing length measurement systems do not guarantee ideal measurement accuracy for both long and short steel plates, and measurement errors are typically far in excess of five parts per million.
Disclosure of Invention
In order to solve the problems, the invention relates to a laser length measuring system based on dynamic cold detection distance, which comprises a laser speed measuring unit, a cold detection unit triggering the laser speed measuring unit and a data processing unit communicated with the laser speed measuring unit, wherein the number of the cold detection units is 3 or more; the system also includes a cold check unit tracking module configured to:
acquiring the pre-measurement length of the measured material;
acquiring the distance between any two cold detection units;
calculating the difference between the length of the measured material before measurement and the interval between any two cold detection units;
and the two cold detection units with the smallest difference are used for triggering the laser speed measurement unit, and the two cold detection units with the smallest difference comprise a front cold detection unit positioned in front of the laser speed measurement unit and a rear cold detection unit positioned behind the laser speed measurement unit according to the advancing direction of the moving measured material.
The second aspect of the invention relates to a laser length measuring method based on dynamic cold detection distance, which comprises the following steps:
a cold detection unit tracking step, the cold detection unit tracking step comprising:
a. acquiring the pre-measurement length of the measured material;
b. obtaining the space between any two cold detection units, wherein the number of the cold detection units is 3 or more than 3;
c. calculating the difference between the length of the measured material before measurement and the interval between any two cold detection units;
d. the two cold detection units with the smallest difference are used for triggering the laser speed measurement unit, and the two cold detection units with the smallest difference comprise a front cold detection unit positioned in front of the laser speed measurement unit and a rear cold detection unit positioned behind the laser speed measurement unit according to the advancing direction of the moving measured material;
a step of measuring the speed by a laser speed measuring unit, wherein the step of measuring the speed by the laser speed measuring unit is to obtain the speed of the measured material by the laser speed measuring unit according to the trigger instructions of the two cold detecting units with the minimum difference value;
and the step of calculating the length by the data processing unit comprises the step of calculating the shortest length to be measured of the measured material by the data processing unit according to the speed of the measured material.
The laser length measuring system based on the dynamic cold detection distance has the advantages that the distance between the two cold detection can be dynamically configured, meanwhile, long materials and short materials can obtain good measuring precision, and the measuring precision can reach an error range of +/-2 mm.
Drawings
FIG. 1 is a known laser length measurement system;
FIG. 2 is a topology diagram of a laser length measurement system for dynamic cold detection distance;
FIG. 3 is a schematic diagram of a laser length measurement system communication that can trigger logic errors;
FIG. 4 shows a display panel of a laser length measurement system for dynamic cold detection distance;
FIG. 5 is a flow chart of a laser length measurement method of dynamic cold detection distance;
FIG. 6 is a flow chart of the cold check unit tracking step;
FIG. 7 is a schematic diagram of a data processing unit.
Detailed Description
The term "material" according to the present invention includes, but is not limited to, steel plates, and sometimes both may be replaced with each other.
The known laser length measuring system is shown in fig. 1, and is based on the external triggering length measuring principle, and comprises an LSV laser velocimeter, an LB1 and an LB2 two cold detectors (photoelectric switches), wherein the LSV laser velocimeter works in an external triggering mode, a material (Obj ect) passes through the length measuring device, and when the two cold detectors LB1 and LB2 detect the material (Obj ect), the length measurement is started; when any one cold check loses the signal, the length measurement is finished; the material length calculating method comprises the following steps: material length = measured length (double cool test active period) +double cool test spacing (Di stand X). Therefore, the space between the double cold inspections of the known laser length measuring system is fixed and can not be changed, so that the measurement precision of the long material is inevitably poorer than that of the short material, the measurement precision of the long material is improved, and the short material can not be measured. The known laser length measuring system has at least the following problems: 1. the length measuring equipment has five parts per million errors, and the larger the measuring length is, the larger the error is. 2. When the total length of the material is smaller than the "double cold check pitch", it cannot be measured. 3. When the total length of the material is much larger than the "double cold check pitch", the error increases.
Furthermore, the space between the two cold checks in the prior art is fixed and can not be changed, but the materials to be measured are different in length. In order to improve the measurement accuracy, a proper cold detection installation distance must be selected, so that not only can all materials be measured, but also the measurement distance is ensured to be as short as possible. Therefore, no matter how the double cold check is installed, high-precision measurement can not be ensured for all the lengths of materials.
Aiming at the technical problems in the prior art, the embodiment of the invention dynamically configures the space between the double cold checks by using a plurality of cold checks so as to achieve the purpose of reducing the measuring distance and improving the measuring precision, thereby simultaneously enabling long materials and short materials to obtain good measuring precision.
The following describes a technical solution of a system embodiment of the first aspect of the present invention.
In some embodiments, the laser length measuring system based on dynamic cold detection distance comprises a laser speed measuring unit, a cold detection unit triggering the laser speed measuring unit, and a data processing unit communicated with the laser speed measuring unit, wherein the number of the cold detection units is 3 or more; the system also includes a cold check unit tracking module configured to:
acquiring the pre-measurement length of the moving measured material;
acquiring the distance between any two cold detection units;
calculating the difference between the pre-measurement length of the moving measured material and the interval between any two cold detection units;
and the two cold detection units with the smallest difference are used for triggering the laser speed measurement unit, and the two cold detection units with the smallest difference comprise a front cold detection unit positioned in front of the laser speed measurement unit and a rear cold detection unit positioned behind the laser speed measurement unit according to the advancing direction of the moving measured material.
One advantage of the embodiments of the present invention is that the cold detection unit tracking module (also referred to as a hardware circuit board) considers which 2 cold detection units are used as the "initial length accumulated value" when the measured material (such as steel plate) passes through the cold detection units.
In a further laser length measuring system, two cold detection units with the smallest difference value are used for triggering the laser speed measuring unit, and the method comprises the following steps:
taking the cold detection interval of the two cold detection units with the smallest difference value as an initial accumulated value;
triggering the laser speed measuring unit to start measurement when the front cold detecting unit senses the head end of the moving measured material;
and triggering the laser speed measuring unit to finish measurement when the rear cold detecting unit senses the tail end of the moving measured material.
It is clear from these examples that another advantage of the embodiments of the present invention is to inform the laser speed measuring unit LSV that the full length of the steel sheet can be obtained only by actually measuring the distance from the cold test 2 to the tail of the steel sheet and adding the initial accumulated value. The number of the hardware circuit boards is not particularly limited, and the 6-way cold detection units are preferably connected, and when the steel plate passes through the cold detection units, the hardware circuit boards consider which 2 cold detection units are used as an initial length accumulated value. Such as: with cold checks 1 and 2, then the initial accumulated value is the spacing of 1 and 2. Then, the LSV is informed that the whole length of the steel plate can be obtained only by actually measuring the distance from the cold test 2 to the tail end of the steel plate. For another example: with cold checks 1 and 3, then the initial accumulated value is the spacing of 1 and 3. Then, the LSV is informed that the whole length of the steel plate can be obtained only by actually measuring the distance from the cold test 3 to the tail end of the steel plate.
In the further laser length measuring system, the cold detecting units are sequentially arranged according to the travelling direction of the moving measured material, and the cold detecting units comprise a first cold detecting unit positioned in front of the laser speed measuring unit and a plurality of second cold detecting units positioned behind the laser speed measuring unit.
Taking the foregoing 6-way cold detection unit as an example, it is also possible to use: cold inspection 1 and 4; cold inspection 1 and 5; cold checks 1 and 6; the cold inspection unit 1 is a first cold inspection unit, and the cold inspection unit 4, the cold inspection unit 5 and the cold inspection unit 6 are second cold inspection units.
In a further laser length measuring system, signals between the cold detection unit tracking module and the laser speed measuring unit are determined based on a plurality of cold detection units.
For example, the hardware circuit board to LSV has only one signal Tr ig2.Tr ig2 is 0 or 1, which is determined by the states of the 6 input cold detection signals. Specifically, tr ig2 is the signal output to the LSV, and is also the "measuring" signal. Whereas the opto-electronic switches 1 to 6 are input signals to the hardware circuit board, the Trig2 output is essentially determined by 6 inputs. Such as: cold inspections 1 and 2 are used, so that the shortest steel plate is suitable to be measured; 1 and 3 are used, and a slightly long steel plate is suitable; 1 and 4 are used, so that longer steel plates are suitable; using 1 and 5, suitable for longer steel plates; 1 and 6 are used, and the longest steel plate is suitable.
The invention does not limit the acquisition mode of the space between any two cold detection units, and the space can be written in a system in advance or acquired by acquisition equipment. Because the system knows which cold detection triggers the laser speed measuring unit, the laser speed measuring unit only needs to measure a short distance, and the total length of the steel plate can be obtained. And the measurement accuracy can reach within an error range of +/-2 mm generally due to short measurement distance.
The data processing unit calculates the distance according to the information of the laser speed measuring unit by the known technology, for example, integrates and calculates the speed value according to the effective signal to obtain the moving distance value.
The laser length measuring system based on the dynamic cold detection distance improves the measurement precision by shortening the distance to be measured, and the distances between different sections of cold detection are known (the error is not more than 1 mm), so that the laser length measuring system can finally achieve a good precision.
In a further laser length measurement system, the cold detection unit tracking module is further configured to:
receiving a direction signal and a motion signal which are obtained by a data processing unit from the laser speed measuring unit;
judging whether a cold detection triggering logic error exists or not;
if so, making an auxiliary decision;
and calculating the difference value between the pre-measurement length of the measured material and the interval between any two cold detection units according to the auxiliary decision.
The method for triggering the logic error is not particularly limited, and in order to avoid the logic error triggered by cold detection caused by factors such as steel plate reversing, manual roller table operation and the like, in a preferred embodiment, a side head fault prompt can be further arranged at the display end of the system. Implementations of the data processing unit of the invention include any known computer processing device. The invention does not limit the auxiliary decision, the method for enhancing the accuracy of logic determination is within the selection range of the invention, such as the method for transmitting the direction and the motion signal of the length measuring instrument to the circuit board to assist the decision, and the technical proposal leads the stability of the system measurement to be further improved. Further, the auxiliary decision is mainly to cope with the field abnormal errors, such as the situation that the steel plate backs up, and also such as the situation that the cold detection has an interference signal to cause the jump between 0 and 1, and the abnormal situations affect the decision of the circuit board. But adding the direction signal and the motion signal can effectively avoid some common errors.
In the laser length measuring system of other embodiments, the cold detecting unit is a photoelectric switch, and preferably, the photoelectric switches are linearly and uniformly arranged.
In the laser length measuring system of other embodiments, the data processing unit includes a material length calculating unit, where the material length calculating unit is configured to add a distance between dynamic cold detection and a shortest length to be measured to obtain a total length of the measured material, where a distance between two cold detection units with a minimum difference is a distance between dynamic cold detection, and the two cold detection units with a minimum difference trigger the length measured by the laser speed measuring unit to be the shortest length to be measured.
Referring to fig. 2, a laser length measuring system 10 based on a dynamic cold detection distance according to some embodiments of the present invention is illustrated in the following description, and as shown in fig. 2, the laser length measuring system includes a laser speed measuring unit 11, a photoelectric switch 12 for triggering the laser speed measuring unit 11, and data processing units (not shown in fig. 2 and referring to fig. 7) for obtaining signals from the laser speed measuring unit 11, where the number of the photoelectric switches 12 is 5, and the photoelectric switches 12 are uniformly arranged in a linear manner according to a pitch N in a running direction of the steel plate 1, and the photoelectric switch 12 senses the steel plate 1 through light 16; the system further comprises an opto-electronic switch tracking module 13 in communication with the 5 opto-electronic switches 12 via signal lines 14 and in communication with the opto-electronic switch tracking module 13 via signal lines 15. As can be seen from fig. 2, the "actually required measured length" is much smaller than the length of the steel plate 1 (about 3.6N).
With continued reference to fig. 2, in order to ensure that the laser length measuring system 10 based on the dynamic cold detection distance can adapt to steel plates 1 with different specifications and lengths and improve measurement accuracy, a corresponding group of photoelectric switches 12 are used for measuring the steel plates 1 with different lengths, and the distance between the double cold detection is dynamically configured so as to achieve the purpose of reducing the measurement distance and improving measurement accuracy. In addition, the photoelectric switch tracking module 13 (for example, may be designed as a circuit board) is used to control which two photoelectric switches 12 are specifically used for triggering the length measuring instrument. The algorithm of the total length of the actual steel plate is as follows:
total length of actual steel plate = distance of dynamic cold test + shortest length to be measured.
Some embodiments of the invention are described below in conjunction with fig. 3, as shown in fig. 3,
the photoelectric switch tracking module 13 receives an LSV direction signal and a motion signal obtained from the laser speed measuring unit 11 (LSV) by the data processing unit 17, and transmits a measurement trigger signal to the LSV.
The LSV receives the measurement trigger signal from the photoelectric switch tracking module 13 and the data request command from the data processing unit 17, and feeds back the LSV direction signal and the motion signal to the data processing unit 17 in 16 bytes.
The data processing unit 17 sends a data request command to the LSV, receives the cold detection state and the dynamic cold detection distance sent by the photoelectric switch tracking module 13 and the LSV direction signal and the motion signal sent by the LSV and fed back in 16 bytes, and sends the LSV direction signal and the motion signal to the LSV receiving photoelectric switch tracking module 13.
Some embodiments of the invention are described below in conjunction with fig. 4, as shown in fig. 4,
the photoelectric switch tracking modules 13 (circuit Board) and Lsv are placed in the same local area network (Board: 192.168.108.9, lsv: 192.168.108.150), and measurement can be started after the connection of the photoelectric switch tracking modules is successful. Tr ig2, photo switch 0, photo switch 1, photo switch 2 trigger Lsv, the system prompts the material "measuring", the current state "active". The relevant parameters are as follows: a counter: 605; status: 0x 14; speed of: 0.000; length: 0.014; signal-to-noise ratio: 55.5; data rate: 2860; mass: 89; a sensor: 0x00; temperature: 32; tr ig2 614. In addition, the LSV can be selectively recorded through the display panel.
The meaning of the relevant parameters is as follows:
a counter: recording the data output times; status: information such as steel/no steel/gauge head faults; speed of: a measured steel plate speed; length: the accumulated length after triggering;
data rate: the amount of data acquired inside the LSV;
mass: measuring a quality digital representation;
a sensor: sensor abnormality flag;
temperature: measuring head temperature
Instantaneous values of the input IO and the output IO are "111000,1". In this embodiment, at most 6 cold detecting units can be connected, and the current steel plate blocks 3 cold detecting units, so that the input is that: 111000. finally, "1" is a signal output to the LSV informing the LSV of the enabled metering length.
The following describes the technical solution of the method embodiment of the second aspect of the present invention.
In some embodiments, the laser length measuring method based on the dynamic cold detection distance comprises the following steps as shown in fig. 5 and 6:
s1, a cold detection unit tracking step, wherein the cold detection unit tracking step comprises the following steps:
a. acquiring the pre-measurement length of the measured material;
b. obtaining the space between any two cold detection units, wherein the number of the cold detection units is 3 or more than 3;
c. calculating the difference between the length of the measured material before measurement and the interval between any two cold detection units;
d. the two cold detection units with the smallest difference value are used for triggering the laser speed measurement unit;
s2, a laser speed measuring unit speed measuring step, wherein the laser speed measuring unit speed measuring step is to obtain the speed of a measured material according to the trigger instruction of the two cold detecting units with the smallest difference value;
and S3, calculating the length by the data processing unit, wherein the step of calculating the length by the data processing unit comprises the step of calculating the shortest length to be measured of the measured material by the data processing unit according to the speed of the measured material.
In a further method of laser length measurement,
the cold detection unit tracking step further comprises:
receiving a direction signal and a motion signal which are obtained by a data processing unit from the laser speed measuring unit;
judging whether a cold detection triggering logic error exists or not;
if so, making an auxiliary decision;
and calculating the difference value between the pre-measurement length of the measured material and the interval between any two cold detection units according to the auxiliary decision.
In a further laser length measuring method, the cold detecting unit is a photoelectric switch, and in a preferred embodiment, the photoelectric switches are linearly and uniformly arranged.
The method further comprises a material length calculation step, wherein the material length calculation step is to add the distance between the dynamic cold detection units and the shortest length to be measured to obtain the total length of the measured material, the distance between the two cold detection units with the smallest difference is the distance between the dynamic cold detection units, and the two cold detection units with the smallest difference trigger the length measured by the laser speed measurement unit to be the shortest length to be measured.
Further, the distance difference between dynamic cold detection of different sections is not more than 1mm.
The embodiments and functional operations of the subject matter described in this specification can be implemented in the following: digital electronic circuitry, tangibly embodied computer software or firmware, computer hardware, including the structures disclosed in this specification and structural equivalents thereof, or a combination of one or more of the foregoing. Embodiments of the subject matter described in this specification can be implemented as one or more computer programs, i.e., one or more modules of computer program instructions encoded on one or more tangible, non-transitory program carriers, for execution by, or to control the operation of, data processing apparatus.
Alternatively or additionally, the program instructions may be encoded on a manually-generated propagated signal, e.g., a machine-generated electrical, optical, or electromagnetic signal, that is generated to encode information for transmission to suitable receiver apparatus for execution by data processing apparatus. The computer storage medium may be a machine-readable storage device, a machine-readable storage substrate, a random or serial access memory device, or a combination of one or more of the foregoing.
The term "data processing unit" encompasses all kinds of apparatus, devices, and machines for processing data, including by way of example a programmable processor, a computer, or multiple processors or multiple computers. The device may comprise a dedicated logic circuit, for example an FPGA (field programmable gate array) or an ASIC (application specific integrated circuit). The apparatus may include, in addition to hardware, code that creates an execution environment for the relevant computer program, such as code that constitutes processor firmware, a protocol stack, a database management system, an operating system, or a combination of one or more of them.
Claims (10)
1. The laser length measuring system based on the dynamic cold detection distance comprises a laser speed measuring unit, a cold detection unit triggering the laser speed measuring unit and a data processing unit communicated with the laser speed measuring unit, and is characterized in that the number of the cold detection units is 3 or more than 3; the system also includes a cold check unit tracking module configured to:
acquiring the pre-measurement length of the measured material;
acquiring the distance between any two cold detection units;
calculating the difference between the length of the measured material before measurement and the interval between any two cold detection units;
and the two cold detection units with the smallest difference are used for triggering the laser speed measurement unit, and the two cold detection units with the smallest difference comprise a front cold detection unit positioned in front of the laser speed measurement unit and a rear cold detection unit positioned behind the laser speed measurement unit according to the advancing direction of the moving measured material.
2. The laser length measuring system of claim 1, wherein the two cold detecting units with the smallest difference are used for triggering the laser speed measuring unit, comprising the following steps:
taking the cold detection interval of the two cold detection units with the smallest difference value as an initial accumulated value;
triggering the laser speed measuring unit to start measurement when the front cold detecting unit senses the head end of the moving measured material;
triggering the laser speed measuring unit to finish measurement when the rear cold detecting unit senses the tail end of the moving measured material;
preferably, it is: the cold detection units are sequentially arranged according to the travelling direction of the moving measured material, and comprise a first cold detection unit positioned in front of the laser speed measurement unit and a plurality of second cold detection units positioned behind the laser speed measurement unit;
preferably, it is: the signals between the cold detection unit tracking module and the laser speed measuring unit are determined based on a plurality of cold detection units.
3. The laser length measurement system of claim 1, wherein,
the cold detection unit tracking module is further configured to:
receiving a direction signal and a motion signal which are obtained by a data processing unit from the laser speed measuring unit;
judging whether a cold detection triggering logic error exists or not;
if so, making an auxiliary decision;
calculating the difference value between the pre-measurement length of the measured material and the interval between any two cold detection units according to the auxiliary decision;
preferably, it is: the cold detection unit is a photoelectric switch, and preferably, the photoelectric switch is in linear and uniform arrangement.
4. The laser length measuring system according to claim 1, wherein the data processing unit includes a material length calculating unit, the material length calculating unit is configured to add a distance between dynamic cold detection and a shortest length to be measured to obtain a total length of the measured material, the distance between two cold detection units with a minimum difference is the distance between dynamic cold detection, and the two cold detection units with a minimum difference trigger the length measured by the laser speed measuring unit to be the shortest length to be measured.
5. The laser length measurement system of claim 1, wherein the difference in spacing between dynamic cold checks of different segments is no more than 1mm.
6. The laser length measuring method based on the dynamic cold detection distance is characterized by comprising the following steps of:
a cold detection unit tracking step, the cold detection unit tracking step comprising:
a. acquiring the pre-measurement length of the measured material;
b. obtaining the space between any two cold detection units, wherein the number of the cold detection units is 3 or more than 3;
c. calculating the difference between the length of the measured material before measurement and the interval between any two cold detection units;
d. the two cold detection units with the smallest difference are used for triggering the laser speed measurement unit, and the two cold detection units with the smallest difference comprise a front cold detection unit positioned in front of the laser speed measurement unit and a rear cold detection unit positioned behind the laser speed measurement unit according to the advancing direction of the moving measured material;
a step of measuring the speed by a laser speed measuring unit, wherein the step of measuring the speed by the laser speed measuring unit is to obtain the speed of the measured material by the laser speed measuring unit according to the trigger instructions of the two cold detecting units with the minimum difference value;
and the step of calculating the length by the data processing unit comprises the step of calculating the shortest length to be measured of the measured material by the data processing unit according to the speed of the measured material.
7. The laser length measuring method according to claim 6, wherein two cold detecting units with the smallest difference are used for triggering the laser speed measuring unit, comprising the steps of:
taking the cold detection interval of the two cold detection units with the smallest difference value as an initial accumulated value;
triggering the laser speed measuring unit to start measurement when the front cold detecting unit senses the head end of the moving measured material;
triggering the laser speed measuring unit to finish measurement when the rear cold detecting unit senses the tail end of the moving measured material;
preferably, it is: the cold detection units are sequentially arranged according to the travelling direction of the moving measured material, and comprise a first cold detection unit positioned in front of the laser speed measurement unit and a plurality of second cold detection units positioned behind the laser speed measurement unit;
preferably, it is: the signals between the cold detection unit tracking module and the laser speed measuring unit are determined based on a plurality of cold detection units.
8. The laser length measuring method according to claim 6, wherein,
the cold detection unit tracking step further comprises:
receiving a direction signal and a motion signal which are obtained by a data processing unit from the laser speed measuring unit;
judging whether a cold detection triggering logic error exists or not;
if so, making an auxiliary decision;
calculating the difference value between the pre-measurement length of the measured material and the interval between any two cold detection units according to the auxiliary decision;
preferably, it is: the cold detection unit is a photoelectric switch, and preferably, the photoelectric switch is in linear and uniform arrangement.
9. The laser length measuring method according to claim 8, wherein the data processing unit calculates the length further comprises a material length calculating step, the material length calculating step is to add the distance between the dynamic cold test and the shortest length to be measured to obtain the total length of the measured material, the distance between the two cold test units with the smallest difference is the distance between the dynamic cold test, and the two cold test units with the smallest difference trigger the length measured by the laser speed measuring unit to be the shortest length to be measured.
10. The laser length measurement method of claim 9, wherein the difference in the spacing between dynamic cold checks of different segments is no more than 1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310540472.5A CN116608771A (en) | 2023-05-12 | 2023-05-12 | Laser length measuring instrument based on dynamic cold detection distance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310540472.5A CN116608771A (en) | 2023-05-12 | 2023-05-12 | Laser length measuring instrument based on dynamic cold detection distance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116608771A true CN116608771A (en) | 2023-08-18 |
Family
ID=87677494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310540472.5A Pending CN116608771A (en) | 2023-05-12 | 2023-05-12 | Laser length measuring instrument based on dynamic cold detection distance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116608771A (en) |
-
2023
- 2023-05-12 CN CN202310540472.5A patent/CN116608771A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8228488B2 (en) | Method and apparatus for thickness measurement | |
| CN102589449B (en) | Length measuring device of slab and measuring method | |
| JP4575483B2 (en) | Servo motor drive control device for calculating power consumption and regenerative power | |
| US9031736B2 (en) | Channel diagnostic system for sent receiver | |
| CN103913140A (en) | Casting blank length precision measuring device and method | |
| JP2013137197A (en) | Laser type thickness measurement system and calibration method therefor | |
| CN107289861B (en) | Automatic centering system and centering detection method for rail flaw detection | |
| CN108534651B (en) | Multipoint-triggered straightness error detection device | |
| CN111328211A (en) | Temperature curve prediction system and method | |
| CN1215151A (en) | Laser on-line testing and checking apparatus for rubber element outline | |
| CN103273382B (en) | Reading device of grating ruler | |
| CN116608771A (en) | Laser length measuring instrument based on dynamic cold detection distance | |
| CN109916311B (en) | Scale grating and grating scale displacement sensor | |
| CN109407471B (en) | Position synchronization method and system of direct-writing photoetching equipment | |
| CN107091612A (en) | A kind of width of plate slab device for dynamically detecting based on FPGA and laser triangulation | |
| KR101325150B1 (en) | Apparatus and method for monitoring machining process reflecting setting error | |
| JP2005231359A (en) | Apparatus and method for recognizing predetermined pattern on moving printed product | |
| CN102101394A (en) | Method for accurately positioning absolute encoder and control device | |
| CN111811384A (en) | Detection device and method for indicating relative displacement of rod and numerical value of gap | |
| CN113701872B (en) | Data synchronization method and system for vibration protection | |
| CN113029211B (en) | Implementation method of high-precision encoder with cable-free rotor | |
| CN115027533B (en) | Rail train speed and distance measuring method and device | |
| CN117308808B (en) | Deformation monitoring method and deformation monitoring system | |
| JP2912050B2 (en) | Measuring device for long objects | |
| JP3223876B2 (en) | Length measurement device for transferred object |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |