CN114812409A - Centrifugal measuring instrument for wall thickness of nodular cast iron pipe - Google Patents
Centrifugal measuring instrument for wall thickness of nodular cast iron pipe Download PDFInfo
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- CN114812409A CN114812409A CN202210465403.8A CN202210465403A CN114812409A CN 114812409 A CN114812409 A CN 114812409A CN 202210465403 A CN202210465403 A CN 202210465403A CN 114812409 A CN114812409 A CN 114812409A
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- wall thickness
- iron pipe
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- laser probe
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
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Abstract
The invention discloses a simple wall thickness measuring instrument for a centrifugal nodular cast iron pipe, which belongs to the field of wall thickness measuring devices in the metallurgical industry. The method detects the wall thickness of the centrifugal nodular cast iron pipe through laser ranging, and has the advantages of simplicity in operation, convenience in carrying, accuracy in measurement, high universality, difficulty in being influenced by the environment and the like.
Description
Technical Field
The invention relates to the field of thickness measuring instruments, in particular to a device for measuring the wall thickness of a cast iron pipe.
Background
The centrifugal nodular cast iron pipe is a pipe cast and molded by cast iron and used for water supply, drainage and gas transmission pipelines, is widely used in industry, and the huge number base makes accurate measurement of the size of the centrifugal nodular cast iron pipe necessary. Because of the size problem of the iron pipe, the traditional vernier caliper measurement limitation is too large to be applied. The common cast iron pipe wall thickness measuring instrument in the market at present mainly takes an ultrasonic pipeline wall thickness gauge.
The ultrasonic wall thickness measuring instrument measures the thickness according to the ultrasonic pulse reflection principle, when the ultrasonic pulse transmitted by the probe reaches the interface surface of the material through the measured object, the pulse is reflected back to the probe, and the thickness of the measured material is determined by accurately measuring the propagation time of the ultrasonic wave in the material. Because the detection surface is smooth and flat by using ultrasonic measurement, the accuracy of the non-planar measurement of the cast tube is poor. The sound waves are greatly influenced by temperature and wind direction, and are easily absorbed by a sound absorption surface, the sound waves can interfere with each other and cannot be measured simultaneously, and the ultrasonic measurement has certain limitation. Therefore, a new measuring instrument with good measuring effect and simple and convenient operation is needed.
Disclosure of Invention
The technical problem that this design will be solved provides a measuring tool that can measure all positions wall thickness in the nodular iron pipe.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides a centrifugal nodular cast iron pipe wall thickness measuring instrument which characterized in that: the device comprises a measuring frame, wherein a first measuring rod and a second measuring rod which are parallel to each other are connected to the measuring frame, a first laser probe is fixed to one end of each measuring rod, a second laser probe is fixed to one end of each measuring rod, and the first laser probe and the second laser probe are vertically opposite and are connected with a control display through transmission lines respectively.
The technical scheme of the invention is further improved as follows: and the first measuring rod and the second measuring rod are internally provided with anti-touch rollers relatively.
The technical scheme of the invention is further improved as follows: and the two measuring rod bodies are provided with scale marks.
The technical scheme of the invention is further improved as follows: there are 5mm and 10mm thickness standards used for calibration before measurement.
The technical scheme of the invention is further improved as follows: the anti-touch roller is made of rubber.
The technical scheme of the invention is further improved as follows: the control display is installed at the lower end of the measuring frame, and the transmission line specification is as follows: 1A transmission, c, the control display comprises a liquid crystal display screen and a built-in chip, the liquid crystal display screen is used for displaying the maximum value and the minimum value of the wall thickness, a built-in wall thickness calculation formula of the built-in chip is X = L-L1-L2, wherein X represents the wall thickness, L represents the distance between a first laser probe and a second laser probe, L1 represents the distance between the first laser probe and the pipe wall, and L2 represents the distance between the second laser probe and the pipe wall.
Due to the adoption of the technical scheme, the invention has the technical progress that:
the method detects the wall thickness of the centrifugal nodular cast iron pipe through laser ranging, and has the advantages of simplicity in operation, convenience in carrying, accuracy in measurement, high universality, difficulty in being influenced by the environment and the like. The function of measuring the wall thickness of the cast iron pipe in real time, the wall thickness change in the measuring range and the maximum and minimum value of the wall thickness can be realized when the measuring frame is kept parallel to the axis and moves at a constant speed.
The installation of the rubber touch-proof roller can avoid the laser probe from touching the inner wall and the outer wall of the pipeline, and reduce the measurement error.
The two measuring rod bodies are provided with scale marks for positioning the distance between the measuring position and the pipe end, so that the position of the measured wall thickness can be visually known conveniently.
The invention also comprises 5mm and 10mm thick standard samples, and the accuracy of the first laser probe and the second laser probe is verified before measurement, so that the preparation of measurement data is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts;
FIG. 1 is a structural diagram of the centrifugal ductile iron pipe wall thickness measuring instrument of the present invention;
FIG. 2 is a schematic view of the working state of the centrifugal ductile iron pipe wall thickness measuring instrument of the invention;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
FIG. 4 is an enlarged view of a portion of FIG. 2 at B;
the device comprises a measuring frame 1, a measuring frame 2, a first measuring rod 3, a second measuring rod 4, a first laser probe 5, a touch-proof roller 6, a second laser probe 7, a transmission line 8 and a control display.
Detailed Description
The present invention will be described in further detail with reference to the following examples:
the first embodiment is as follows:
as shown in fig. 1, the centrifugal ductile iron pipe wall thickness measuring instrument comprises a measuring frame 1, wherein two parallel measuring rods are connected to the measuring frame 1, a first measuring rod 2 and a second measuring rod 3 with dimension scales are arranged on the rod body, a first laser probe 4 and a second laser probe 6 are respectively and vertically fixed at the end part of each measuring rod, and the two laser probes are connected with a control display 8 through a transmission line 7.
Wherein control display 8 installs at measuring rack 1 lower extreme, and 7 specifications of transmission line are: 1A transmission and c port, and can realize optical signal conversion and electric signal connection with a laser probe and a control display 8. The control display 8 comprises a liquid crystal display screen and a built-in chip, the wall thickness can be displayed on the liquid crystal display screen and is used for displaying the maximum value and the minimum value of the wall thickness, and a built-in wall thickness calculation formula of the built-in chip is arranged.
When the thickness of the cast iron pipe wall is measured, a control display is turned on, two laser probes start to work, the distance between the two laser probes is L, a first laser probe and a second laser probe are respectively arranged inside and outside the pipe wall of the nodular cast iron pipe until the laser probes reach the position for measuring the wall thickness, the size scales on a second measuring rod can be read, and the measuring rod is kept parallel to the axis of the nodular cast iron pipe as far as possible during the measurement; the first laser probe measures the vertical distance L1 between the first laser probe and the inner surface of the pipeline, the second laser probe measures the vertical distance L2 between the second laser probe and the outer surface of the pipeline, the wall thickness X = L-L1-L2 of the pipeline at the position where the ductile iron pipe is measured, and the control display can calculate the wall thickness at the position where the pipe is measured according to the formula.
Example two:
the control display can measure the thickness of a certain point and can also measure the axial wall thickness of the ductile iron pipe in real time, the real-time measurement mode is measurement every 1 second, the measurement frame is moved at a constant speed in parallel with the axis, and the maximum value and the minimum value of a measurement range and the wall thickness change of the measurement range can be measured; the laser probe is provided with 5mm and 10mm thickness standard samples, and correction is carried out before each measurement, so that wall thickness measurement errors are avoided.
Example three:
the difference between this embodiment and the above-mentioned embodiment lies in that the relative internally mounted of measuring stick one 2 and measuring stick two 3 has anti-touch gyro wheel 5, and anti-touch gyro wheel is the rubber material, can avoid laser probe and pipeline inside and outside wall to take place to touch, reduces measuring error.
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 (6)
1. The utility model provides a centrifugal nodular cast iron pipe wall thickness measuring instrument which characterized in that: the device comprises a measuring frame (1), wherein a first measuring rod (2) and a second measuring rod (3) which are parallel to each other are connected to the measuring frame (1), a first laser probe (4) is fixed to one end of the first measuring rod (2), a second laser probe (6) is fixed to one end of the second measuring rod (3), the first laser probe (4) and the second laser probe (6) are vertically opposite to each other, and are respectively connected with a control display (8) through a transmission line (7).
2. The centrifugal ductile iron pipe wall thickness measuring instrument according to claim 1, wherein: and the anti-touch roller (5) is arranged in the opposite inner parts of the first measuring rod (2) and the second measuring rod (3).
3. The centrifugal ductile iron pipe wall thickness measuring instrument according to claim 1, wherein: and the second measuring rod (3) is provided with scale marks.
4. The centrifugal ductile iron pipe wall thickness measuring instrument according to claim 1, wherein: including 5mm and 10mm thickness standards for calibration prior to measurement.
5. The centrifugal ductile iron pipe wall thickness measuring instrument according to claim 2, wherein: the anti-touch roller (5) is made of rubber.
6. The centrifugal ductile iron pipe wall thickness measuring instrument according to claim 1, wherein: the control display (8) is arranged at the lower end of the measuring frame (1), and the transmission line (7) is of the specification: 1A transmission port and c port, wherein the control display (8) comprises a liquid crystal display screen and a built-in chip, the liquid crystal display screen is used for displaying the maximum value and the minimum value of the wall thickness, the built-in wall thickness calculation formula of the built-in chip is X = L-L1-L2, wherein X represents the wall thickness, L represents the distance between a first laser probe (4) and a second laser probe (6), L1 represents the distance between the first laser probe (4) and the pipe wall, and L2 represents the distance between the second laser probe (6) and the pipe wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210465403.8A CN114812409A (en) | 2022-04-29 | 2022-04-29 | Centrifugal measuring instrument for wall thickness of nodular cast iron pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210465403.8A CN114812409A (en) | 2022-04-29 | 2022-04-29 | Centrifugal measuring instrument for wall thickness of nodular cast iron pipe |
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| Publication Number | Publication Date |
|---|---|
| CN114812409A true CN114812409A (en) | 2022-07-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210465403.8A Pending CN114812409A (en) | 2022-04-29 | 2022-04-29 | Centrifugal measuring instrument for wall thickness of nodular cast iron pipe |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040111235A1 (en) * | 2002-12-09 | 2004-06-10 | Haskins Donald H. | Ultrasonic gauge online calibration system |
| CN203396364U (en) * | 2013-07-31 | 2014-01-15 | 黄石新兴管业有限公司 | Device for continuous measurement of wall thickness of ductile cast iron pipe |
| CN105869688A (en) * | 2016-04-29 | 2016-08-17 | 清华大学 | Measuring method and device for containment water-film coverage rate |
| CN207991411U (en) * | 2017-11-29 | 2018-10-19 | 无锡市汇鼎金属制管有限公司 | A kind of metal pipe-wall thickness measuring device |
| US20180356209A1 (en) * | 2017-06-12 | 2018-12-13 | Advanced Gauging Technologies, LLC | Laser Gauge With Full Air Gap Measurement Range |
| CN209514067U (en) * | 2018-12-14 | 2019-10-18 | 东莞市创明电池技术有限公司 | Handheld laser calibrator |
| CN210426862U (en) * | 2019-08-13 | 2020-04-28 | 北京铁道工程机电技术研究所股份有限公司 | Water spray pressure measuring device |
| CN212620597U (en) * | 2020-07-14 | 2021-02-26 | 武汉铁辰工程检测有限公司 | Handheld portable laser thickness gauge |
-
2022
- 2022-04-29 CN CN202210465403.8A patent/CN114812409A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040111235A1 (en) * | 2002-12-09 | 2004-06-10 | Haskins Donald H. | Ultrasonic gauge online calibration system |
| CN203396364U (en) * | 2013-07-31 | 2014-01-15 | 黄石新兴管业有限公司 | Device for continuous measurement of wall thickness of ductile cast iron pipe |
| CN105869688A (en) * | 2016-04-29 | 2016-08-17 | 清华大学 | Measuring method and device for containment water-film coverage rate |
| US20180356209A1 (en) * | 2017-06-12 | 2018-12-13 | Advanced Gauging Technologies, LLC | Laser Gauge With Full Air Gap Measurement Range |
| CN207991411U (en) * | 2017-11-29 | 2018-10-19 | 无锡市汇鼎金属制管有限公司 | A kind of metal pipe-wall thickness measuring device |
| CN209514067U (en) * | 2018-12-14 | 2019-10-18 | 东莞市创明电池技术有限公司 | Handheld laser calibrator |
| CN210426862U (en) * | 2019-08-13 | 2020-04-28 | 北京铁道工程机电技术研究所股份有限公司 | Water spray pressure measuring device |
| CN212620597U (en) * | 2020-07-14 | 2021-02-26 | 武汉铁辰工程检测有限公司 | Handheld portable laser thickness gauge |
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