KR101628955B1 - Position information detection device for roll and method thereof - Google Patents

Position information detection device for roll and method thereof Download PDF

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Publication number
KR101628955B1
KR101628955B1 KR1020150120113A KR20150120113A KR101628955B1 KR 101628955 B1 KR101628955 B1 KR 101628955B1 KR 1020150120113 A KR1020150120113 A KR 1020150120113A KR 20150120113 A KR20150120113 A KR 20150120113A KR 101628955 B1 KR101628955 B1 KR 101628955B1
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South Korea
Prior art keywords
roll
laser
horizontal
sensor
reflector
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KR1020150120113A
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Korean (ko)
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정홍석
김진성
박재원
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(주)피씨엠솔루션
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Priority to KR1020150120113A priority Critical patent/KR101628955B1/en
Priority to PCT/KR2015/012796 priority patent/WO2017034087A1/en
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Publication of KR101628955B1 publication Critical patent/KR101628955B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/12—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring roll camber
    • 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
    • G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C9/00—Measuring inclination, e.g. by clinometers, by levels
    • 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
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88—Lidar systems specially adapted for specific applications
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/0002—Inspection of images, e.g. flaw detection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2203/00—Auxiliary arrangements, devices or methods in combination with rolling mills or rolling methods
    • B21B2203/18—Rolls or rollers

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mechanical Engineering (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Theoretical Computer Science (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Quality & Reliability (AREA)

Abstract

According to the present invention, it is an object of the present invention to provide a high precision measuring apparatus using a laser so that the horizontal and parallel degrees of a roll can be easily measured with a minimum number of persons without being restricted by the installation state and location of the roll facility.
In order to attain the above object, the present invention provides a fixing apparatus comprising: a fixing jig which is seated on a reference roll and includes a laser number for detecting distance information, a sensor section for storing a transmission section and a laser signal, A moving jig that reflects the laser signal at a right angle at the reflecting portion and transmits the reflected laser signal to the laser receiving portion, and controls the laser number and the emitting portion, receives the distance value measured by the sensor portion, and collects data to calculate a corresponding relationship between image information and distance information And a controller for determining the horizontal and parallel degrees of the measuring roll.

Description

TECHNICAL FIELD [0001] The present invention relates to a roll position information detecting apparatus and a roll position information detecting apparatus,

The present invention relates to a roll posture information detecting apparatus and a measuring method thereof, and more particularly, to a roll posture information detecting apparatus and a measuring method thereof, And a method of measuring the roll attitude information.

In general, rolls are essentially used in various roll-to-roll equipment, rolling mills, etc. used in the manufacturing process of steel products or films, and these rolls are used at the line- Alignment of equipment is very important because it has continuity to the exit.

The rolls in the production line of the film or rolling mill act to turn the strips or to tension them. Therefore, if the alignment and level of the rolls are not precisely aligned with respect to the centerline of the strip in the direction in which the strip advances, a meandering phenomenon occurs in which the product is tilted toward one side with respect to the centerline of the strip in the traveling direction, , Causing waveforms, overlaps, thickness variations, etc., causing a plate breakage during operation and discontinuing production, thereby causing a problem of lowering productivity.

These rolls are consumables that require maintenance such as repairs and exchanges, and are managed according to strict standards to ensure optimal strip progression due to the nature of the continuous line.

Therefore, equipment for measuring and diagnosing the posture information of the roll, that is, the horizontal degree and the parallel degree, are intensively developed.

A roll measuring device of "HAMAR LASER" is used as a device which is mainly used in recent years. According to a schematic view shown in FIG. 1, a red light-visible laser is irradiated and the irradiated laser beam is set to be parallel to the reference roll And an angular prism. The alignment of the rolls can be calibrated in real time using the principle of being irradiated parallel to the rolls to be measured.

However, when there is an obstacle in the position to be measured, or when the measurement is performed in a separate space, it is impossible to measure, and since the horizontal and parallel measurements of the object to be measured must be separately measured, it is inconvenient to set the reference roll every time.

A prior art reference to a roll alignment and level diagnosing apparatus in accordance with the present invention is disclosed in Korean Patent Laid-Open Publication No. 10-2014-0053492 (Publication date 2014.05.08). However, There is a problem that the reliability of the bubble tube is lowered and the calculation method is complicated by measuring the reference distance and the measured distance of the diagnostic roll by holding the zero point of the reference roll through the bubble tube,

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a high accuracy roll posture information detecting apparatus and a measuring method thereof using a laser so that the horizontality and parallelism of the roll can be easily measured with a minimum number of persons That is the purpose.

Another object of the present invention is to provide a roll posture information detecting apparatus and a measuring method thereof that can be measured without being restricted by the installation state and location of the roll facility without disassembling the roll, That is the purpose.

Another object of the present invention is to provide a roll posture information detecting apparatus and a measuring method thereof, in which the reference roll is quickly aligned and the plurality of rolls can be continuously measured based on the reference roll .

According to an aspect of the present invention, there is provided a measuring apparatus comprising: a fixing jig that is mounted on a reference roll and includes a laser number for sensing distance information, a sensor unit for storing a transmission portion and a laser signal, A moving jig which is seated and reflects the laser signal at a right angle at the reflecting portion and transmits the reflected laser signal to the laser receiving portion; a control unit which controls the laser number and the emitting unit, receives the distance value measured by the sensor unit, collects data, And a controller for calculating the horizontal and parallel degrees of the measuring roll by calculating the horizontal and parallel degrees.

Preferably, the lower surface of the fixing jig and the moving jig may be formed in a shape of "? &Quot; within 140 to 160 degrees so as to increase the adhesion with the roll.

Further, the fixing jig may further include a tilt sensor to measure the absolute value of the sea level reference level, thereby measuring the level of the reference roll.

The sensor unit may be a CCD image sensor (Charge Coupled Device) or a CMOS image sensor (Complimentary Metal Oxide Semiconductor).

The reflector includes a first reflector that receives a signal from the laser emitting unit and reflects the signal at an angle of 90 degrees and a second reflector that reflects the signal reflected from the first reflector at an angle of 90 degrees and transmits the signal to the laser receiver .

In addition, the control unit may display the horizontal and / or parallelism of the measuring roll by performing coordinate conversion on the correspondence relationship between the image information and the distance information, including a display device mounted on the moving jig or connected separately or wirelessly.

On the other hand, as the roll posture information detection and measurement method, there is a method of measuring the horizontal position of the reference roll using a tilt sensor in a state where the fixing jig is seated, Receiving the laser signal reflected by the reflecting part of the measuring roll, measuring the distance value measured according to the received laser signal, calculating the correspondence relation between the image information and the distance information, performing the coordinate conversion, And determining a degree of parallelism.

A step of acquiring image information and calculating a ratio of a pixel size and an actual distance of the horizontal and vertical lattices to set a resolution per pixel in the step of determining the horizontal and parallel degrees of the measurement roll; Registering a reference by setting a coordinate value on the basis of the value of the measured roll, and displaying the horizontal and parallel measurement values and the correction value on the display device when the measurement data for the measurement roll is generated and storing the measured value .

In the step of determining the horizontal and parallelism of the measurement roll, the grid-shaped coordinate target position is calculated using an image picked up by a sensor unit composed of a CCD image sensor or a CMOS image sensor.

In the roll posture information detecting device and the measuring method thereof according to the present invention, by using the roll-to-roll posture information detecting device provided with the inclination sensor, the laser foot, the receiving part and the reflecting part, And can be measured quickly.

In addition, the present invention can perform measurement using a laser in a state of being seated on a roll, without any restriction on the size and location of the roll facility, and it is possible to standardize data collection and simplify the work procedure.

In the present invention, the reliability of the measurement value is improved by performing the analysis by the measurement system irrespective of the analytical ability of the individual of the measurer, the measurement time is shortened and the cost is reduced, The energy consumption is reduced and productivity is improved by preventing the defective product due to meandering.

FIG. 1 is a view showing a conventional roll measuring equipment,
2 is a perspective view of a roll posture information detecting apparatus according to the present invention,
FIG. 3 is a configuration diagram of a roll posture information detecting apparatus according to the present invention,
FIG. 4 is a diagram illustrating horizontal measurement of the roll posture information detecting apparatus according to an embodiment of the present invention, and FIG.
5 is a diagram illustrating parallel measurement of a roll posture information detecting apparatus according to an embodiment of the present invention, and FIG.
6 is a flowchart of a roll attitude information detection and measurement method according to the present invention,
7 is a detailed flowchart of a step of determining the horizontal and the parallelism of the measuring roll according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure and operation of the roll posture information detecting apparatus according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 2 is a perspective view of a roll position information detecting apparatus according to the present invention, FIG. 3 is a configuration diagram of a roll position information detecting apparatus according to the present invention, FIG. FIG. 5 is a diagram illustrating parallel measurement of a roll position information detecting apparatus according to an embodiment of the present invention, FIG. 6 is a flowchart of a roll position information detecting and measuring method according to the present invention, 7 is a detailed flowchart of a step of determining the horizontal and the parallelism of the measuring roll according to the present invention.

2 to 3, the roll posture information detecting apparatus according to the present invention includes a fixing jig 100 that is roughly placed on a reference roll 10, a moving jig 110 that is seated on the measuring roll 20, And a controller 120 for receiving the distance value between the reference roll 10 and the measuring roll 20 and collecting data to calculate a corresponding relationship between image information and distance information.

First, the fixing jig 100 is preferably made of an aluminum material, and the lower part may be made of a metal material considering the degree. Further, the lower part of the fixing jig 100 may have a " As shown in FIG.

Preferably < RTI ID = 0.0 > 150. ≪ / RTI >

 An inclination sensor 102 may be installed at the middle portion of the fixed jig 100. The inclination sensor 102 measures the inclination and measures an absolute value of the sea level reference horizontal level, Can be measured.

In addition, the tilt sensor 102 is small and wirelessly transmits the tilt value to the control unit 120. In addition to the tilt sensor 102, a bubble tube or the like may also be used.

The laser emitting unit 104 may be installed at one end of the fixing jig 100, and the laser receiving unit 106 may be installed at the other end of the fixing jig 100.

Since the laser beam is horizontally scanned toward the front and reflected from an object to receive the laser beam and is typically used in the case of the laser beams and the transmitting units 106 and 104, a detailed description thereof will be omitted.

The sensor unit 108 may be a CCD image sensor (Charge Coupled Device) or a CMOS image sensor capable of capturing image information. The sensor unit 108 may include a sensor unit 108 that is electrically connected to the laser receiving unit 106 and stores a laser signal. And a sensor (Complimentary Metal Oxide Semiconductor).

The moving jig 110 is mounted on the measuring roll 20 spaced apart from the fixing jig 100 and reflects the laser signal at a right angle at the reflecting portion 112 and transmits the reflected laser signal to the laser receiving portion 106, The main body may be made of an aluminum material, and the lower part may be made of a metal material in consideration of the degree. Further, the lower portion may be formed in a shape of "? &Quot; within 140 to 160 degrees so as to increase the adhesion with the roll.

Preferably < RTI ID = 0.0 > 150. ≪ / RTI >

The moving jig 110 may be provided with a reflecting portion 112 capable of receiving and reflecting a laser beam. The reflecting portion 112 receives a signal from the laser emitting portion 104, And a second reflector 112b that reflects the signal reflected from the first reflector 112a at an angle of 90 degrees and transmits the reflected signal to the laser receiver 106. [

The first reflector 112a may be provided at a position coinciding with the laser emitting unit 104 in the horizontal direction and the second reflector 112b may be provided in the horizontal direction coinciding with the laser receiving unit 106. [

The first reflector 112a and the second reflector 112b are preferably arranged at an angle of 45 °, which are opposite to each other.

Meanwhile, the control unit 120 controls the laser number, the transmission units 106 and 104, receives the distance value measured by the sensor unit 108, collects data, calculates a corresponding relationship between image information and distance information, And may include a display device mounted on the moving jig 110 or connected separately or wirelessly to determine the horizontality and parallelism of the roll 20.

The display device may be a personal computer, a mobile device, a tablet PC, and may display the horizontal and parallelograms of the measurement roll 20 by performing coordinate transformation on correspondence between image information and distance information.

The display unit of the control unit 120 may be equipped with software that can perform image processing by performing coordinate transformation. The software may analyze, record, and generate data. In addition, data management of the data, input of measurement information, Function.

6, the method of measuring roll position information according to the present invention includes the steps of measuring (200) the horizontality of a reference roll using an inclination sensor in a state where the fixing jig is seated, (210) reflecting the laser signal emitted from the point of the reference roll at the reflection part of the moving jig seated on the measuring roll and receiving the laser signal; And a step 220 of calculating the correspondence between the distance information and the distance information and performing the coordinate transformation to determine the horizontal and the parallelism of the measurement roll.

Here, in the step 200 of measuring the horizontal degree of the reference roll, the fixing jig 100 having the shape of "∧" is placed on the upper surface of the reference roll 10 and the horizontal degree is measured through the inclination sensor 102 . If the horizontal level of the reference roll 10 is not correct, the horizontal level calibration operation is performed. If the horizontal level is correct, the measurement of the measurement roll 20 is performed.

The moving jig 110 is placed on the measuring roll 20 which requires measurement in the same manner as the fixing jig 100 is placed on the reference roll 10.

In step 210, when a laser signal is transmitted from the laser emitting part 104 of the fixing jig 100 to the first reflecting mirror 112a provided on the moving jig 110, the first reflecting mirror 112a reflects And the reflected laser beam is reflected by the second reflector 112b again to transmit the signal to the laser receiving unit 106.

In operation 220, the laser signal transmitted to the laser receiver 106 is transmitted from the sensor unit 108, which may be a CCD image sensor or a CMOS image sensor, to the controller 120, The lattice-type coordinate target position can be calculated.

The step 220 includes a calibration step 222 for obtaining image information and calculating a ratio of the pixel size and the actual distance of the horizontal and vertical lattices to set the resolution per pixel, (224) of setting a coordinate value by setting a coordinate value, and displaying the horizontal and parallel measurement values and the correction value on the display device when the measurement data for the measuring roll (20) is generated and storing the measured value 226).

That is, the step 222 obtains the image information by using the calibration target by clicking the setting of the sensor unit 108 on the display device, calculates the ratio of the size of the pixels in the horizontal and vertical gratings to the actual distance, That is, the grid size, and this step 222 is preferably executed only once at the beginning.

After step 222, the number of reference rolls 10 in the display device can be set and stored, and the measurement process, the number of measurements, the calibration specification, the number of rolls, and the size measurement offset value can be stored.

Then, in step 224, the setting button of the sensor unit 108 is clicked to confirm the image information, and the coordinate value of the measured reference roll 10 is registered as a reference.

In step 226, when the measurement roll 20 to be measured is clicked on the display device, if the screen is changed from measurement to measurement and the corresponding roll number is changed to a measurable state, the measurement or correction is mistaken The deviation of the measuring roll 20 is confirmed and corrected, and the measurement is performed so that the measuring roll 20 meets the required value.

Accordingly, if the target position is shifted to the upper or lower side of the center of the grid position as shown in FIG. 4, it is determined that the horizontality is not appropriate.

In FIG. 5, if the parallelism does not match, it can be seen that the target position deviates from the center in the lattice coordinates to the left and right sides, and the position is changed by the degree of deviation.

In the case where the roll posture is poor in the substantially lattice-type coordinate system, since the horizontal and the parallel degree are often not suitable, the target position can be displayed diagonally from the center of the lattice-like coordinate system.

The position of the measuring roll 20 is adjusted according to the displayed target position. For example, if the correction value is larger than the allowable value, it is displayed in red, and if it is smaller than the allowable value, it is displayed in green,

Measured values and guaranteed values may be stored in a file.

As described above, the present invention is a high-precision measuring apparatus using a laser so that the horizontal and parallelism of the roll can be easily measured with a minimum number of persons without being restricted by the installation state and place without disassembling the roll in the facility.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

10: reference roll 20: measuring roll
100: Fixing jig 102: Tilt sensor
104: laser emitting section 106: laser receiving section
108: sensor unit 110: moving jig
112: reflection part 112a: first reflection mirror
112b: second reflector 120:

Claims (9)

A fixing jig which is seated on a reference roll and includes a laser number for detecting distance information, a sensor part for storing a transmission part and a laser signal,
A moving jig which is seated on a measuring roll spaced from the reference roll and reflects the laser signal at a right angle at a reflecting part and transmits the reflected laser signal to the laser receiving part,
And a control unit for controlling the laser number and the emission unit, receiving the distance value measured by the sensor unit, collecting data, and calculating a corresponding relationship between the image information and the distance information to determine the horizontal and parallelism of the measurement roll, ,
The fixing jig may further include an inclination sensor to measure the absolute value of the sea level reference horizontal level and to measure the horizontal level of the reference roll,
The reflector includes:
A first reflector that receives a signal from the laser emitting unit and reflects the light at an angle of 90 DEG,
And a second reflector for reflecting the signal reflected from the first reflector at an angle of 90 degrees and transmitting the reflected signal to the laser receiver.
The method according to claim 1,
Wherein the lower surface of the fixing jig and the lower surface of the moving jig have a shape of "?&Quot; within 140 to 160 degrees so as to increase the adhesion force with the roll.
delete The method according to claim 1,
The sensor unit includes:
A CCD image sensor (Charge Coupled Device) or a CMOS image sensor (Complimentary Metal Oxide Semiconductor).
delete The method according to claim 1,
Wherein,
And a display device connected to the moving jig or connected separately or wirelessly to display the horizontal and the parallelism of the measuring roll by performing coordinate conversion on the correspondence relationship between the image information and the distance information, Information detecting device.
Measuring the level of the reference roll using the tilt sensor in a state where the fixing jig is seated,
The laser beam emitted from the point of the reference roll is reflected by the first reflector constituting the reflecting portion of the moving jig that is seated on the measuring roll at an angle of 90 ° and the signal reflected from the first reflector is reflected again by the second reflector ≪ / RTI > to receive the laser signal,
A step of data collection of the distance value measured according to the received laser signal and calculating a correspondence relation between the image information and the distance information and performing coordinate conversion to determine the horizontal and parallelism of the measurement roll
And detecting the roll posture information.
8. The method of claim 7,
In the step of determining the horizontality and parallelism of the measuring roll,
A calibration step of acquiring the image information and calculating a ratio of a pixel size and an actual distance of the horizontal and vertical lattice to set a resolution per pixel,
Registering a reference by setting a coordinate value based on the coordinate value of the set reference roll;
Displaying the horizontal and parallel measurement values and the correction values on the display device and storing the measured values when the measurement data for the measurement roll is generated,
Further comprising the steps of:
8. The method of claim 7,
In the step of determining the horizontality and parallelism of the measuring roll,
Wherein the lattice-type coordinate target position is calculated using an image picked up by a sensor unit composed of either a CCD image sensor or a CMOS image sensor.
KR1020150120113A 2015-08-26 2015-08-26 Position information detection device for roll and method thereof KR101628955B1 (en)

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PCT/KR2015/012796 WO2017034087A1 (en) 2015-08-26 2015-11-26 Roll positioning information detection device and measuring method thereof

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KR101846514B1 (en) * 2017-12-12 2018-04-13 주식회사 피씨엠테크 Apparatus and method for measuring alignment state of the roll
KR101868813B1 (en) * 2017-03-14 2018-06-20 삼흥기계 (주) Roller balance detecting structure for film coater
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KR101868813B1 (en) * 2017-03-14 2018-06-20 삼흥기계 (주) Roller balance detecting structure for film coater
KR101846514B1 (en) * 2017-12-12 2018-04-13 주식회사 피씨엠테크 Apparatus and method for measuring alignment state of the roll
JP7085740B2 (en) 2018-10-08 2022-06-17 ピーシーエム ソリューション カンパニー，リミテッド A device for detecting relative posture information between rolls and a method for measuring the roll alignment state using the device.
KR101914942B1 (en) * 2018-10-08 2018-11-06 정홍석 Apparatus and method for measuring alignment state of the roll
WO2020075955A1 (en) 2018-10-08 2020-04-16 주식회사 피씨엠솔루션 Apparatus for detecting relative positioning information between rolls, and method for measuring roll alignment state by using same
US11192158B2 (en) 2018-10-08 2021-12-07 Pcm Solution Co., Ltd. Apparatus for detecting relative positioning information between rolls, and method for measurement roll alignment state by using same
JP2022511260A (en) * 2018-10-08 2022-01-31 ピーシーエム ソリューション カンパニー，リミテッド A device for detecting relative posture information between rolls and a method for measuring the roll alignment state using the device.
CN109015336A (en) * 2018-10-26 2018-12-18 飞磁电子材料(东莞)有限公司 A kind of the abradant surface parallel detection system and method for T-type FERRITE CORE
CN109015336B (en) * 2018-10-26 2023-09-29 飞磁电子材料(东莞)有限公司 Grinding surface parallelism detection system and method for T-shaped ferrite core
CN114440964A (en) * 2021-12-16 2022-05-06 孟学慧 Multi-sensor arrangement device for temperature and humidity detection and calibration of laboratory equipment
CN114440964B (en) * 2021-12-16 2024-01-09 深圳市瑞比德传感技术有限公司 Multi-sensor arrangement device for temperature and humidity detection calibration of laboratory equipment
CN116147571A (en) * 2023-04-20 2023-05-23 滨州高新高端装备制造产业园有限公司 Cement pole offset angle measuring tool
CN116147571B (en) * 2023-04-20 2023-07-25 滨州高新高端装备制造产业园有限公司 Cement pole offset angle measuring tool

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