CN107870140B - Device and method for calculating concentration of magnetic suspension in round steel magnetic powder flaw detection - Google Patents
Device and method for calculating concentration of magnetic suspension in round steel magnetic powder flaw detection Download PDFInfo
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- CN107870140B CN107870140B CN201610839731.4A CN201610839731A CN107870140B CN 107870140 B CN107870140 B CN 107870140B CN 201610839731 A CN201610839731 A CN 201610839731A CN 107870140 B CN107870140 B CN 107870140B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 284
- 239000010959 steel Substances 0.000 title claims abstract description 284
- 239000000725 suspension Substances 0.000 title claims abstract description 118
- 239000006247 magnetic powder Substances 0.000 title claims abstract description 68
- 238000001514 detection method Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000004364 calculation method Methods 0.000 claims abstract description 46
- 238000007689 inspection Methods 0.000 claims abstract description 30
- 238000012545 processing Methods 0.000 claims abstract description 30
- 230000005540 biological transmission Effects 0.000 claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 claims abstract description 17
- 230000001681 protective effect Effects 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 4
- 238000004062 sedimentation Methods 0.000 claims description 4
- 238000001556 precipitation Methods 0.000 claims description 3
- 239000006249 magnetic particle Substances 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000003287 optical effect Effects 0.000 description 11
- 230000007547 defect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/075—Investigating concentration of particle suspensions by optical means
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Abstract
The invention relates to a device and a method for calculating the concentration of magnetic suspension in round steel magnetic powder inspection, wherein the device comprises the following components: the round steel diameter sensor is used for measuring a first signal of the diameter of the round steel in real time; the round steel length sensor is used for measuring a first signal of the length of the round steel in real time; the data conversion and transmission module is used for converting the round steel diameter first signal and the round steel length first signal into a long-distance industrial transmission form round steel diameter second signal and a round steel length second signal respectively, outputting and transmitting the signals; the data processing module is used for respectively converting the second signal of the diameter of the round steel and the second signal of the length of the round steel into the diameter of the round steel and the length of the round steel for data calculation, and then calculating according to the concentration of the magnetic suspension consumed by the current round steel to obtain the concentration value of the magnetic suspension in the current round steel magnetic powder inspection; and the display module is used for displaying the concentration value of the magnetic suspension in the current round steel magnetic powder inspection. The invention can calculate the concentration of the magnetic suspension in the round steel magnetic powder flaw detection in real time, and display the calculation result in real time, thereby being beneficial to the subsequent operation.
Description
Technical Field
The invention relates to a round steel magnetic powder flaw detection technology, in particular to a computing device and a computing method capable of computing the concentration of magnetic suspension in round steel magnetic powder flaw detection in real time.
Background
In round steel magnetic powder flaw detection, an ultraviolet lamp with certain brightness is required to irradiate a workpiece coated with magnetic suspension, and then a fluorescent image is detected manually or by equipment to identify the round steel defects. In the round steel defect identification process, a fluorescent image needs to be ensured to have certain brightness. In actual flaw detection, the brightness of the fluorescent image can be influenced along with the continuous consumption of magnetic powder in the magnetic suspension, so that the measuring effect on the defect of the round steel is influenced. Therefore, the concentration of the magnetic suspension is an important parameter in the magnetic powder inspection process.
The traditional method for measuring the concentration of magnetic suspension is a pear-shaped sedimentation tube method for measuring the volume of magnetic powder. The method has the defects of long measuring time, incapability of displaying the measuring result to an operator in time and the like.
Some new methods and devices for detecting the concentration of magnetic suspension have appeared. For example, CN 103063554, "a method for rapidly and qualitatively determining the concentration of magnetic suspension based on transmittance", detects the concentration of magnetic suspension by using the rule that the transmittance of magnetic suspension changes with the change of concentration. However, this method cannot accurately measure the concentration value and only gives a qualitative conclusion.
Also, for example, CN 1712949a, "magnetic powder concentration sensor for magnetic suspension", measures the concentration of magnetic suspension by using the current change caused by electromagnetic induction. However, in actual field application, the problems of small current signal change, large interference signal and the like exist, and accurate measurement is difficult.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a magnetic suspension concentration calculating device in round steel magnetic powder inspection, which can calculate magnetic powder consumed by a workpiece to be inspected and calculate the concentration of magnetic suspension in real time by utilizing area data of the round steel to be inspected.
The invention also aims to provide a method for calculating the concentration of the magnetic suspension in the round steel magnetic powder inspection, which can calculate the concentration of the magnetic suspension in real time.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a round steel magnetic powder is visited magnetic suspension concentration calculating device in wound, it contains:
the round steel diameter sensor is used for detecting the diameter of the round steel in real time and measuring a first signal of the diameter of the round steel;
the round steel length sensor is used for detecting the length of the round steel in real time and measuring a first signal of the length of the round steel;
the data conversion and transmission module is respectively connected with the round steel diameter sensor and the round steel length sensor, and respectively converts the round steel diameter first signal and the round steel length first signal into a round steel diameter second signal and a round steel length second signal in a long-distance industrial transmission form, outputs the round steel diameter second signal and the round steel length second signal and transmits the round steel diameter second signal and the round steel length second signal;
the data processing module is connected with the data conversion and transmission module, converts the second round steel diameter signal and the second round steel length signal into a round steel diameter calculation signal and a round steel length calculation signal for data calculation respectively, defines the round steel diameter calculation signal and the round steel length calculation signal as the round steel diameter and the round steel length respectively, calculates the round steel surface area by using the round steel diameter and the round steel length, and calculates the magnetic suspension concentration value in the current round steel magnetic powder inspection according to the magnetic suspension concentration consumed by the current round steel;
and the display module is connected with the data processing module and is used for displaying the concentration value of the magnetic suspension in the current round steel magnetic powder inspection transmitted by the data processing module.
The round steel diameter sensor adopts a laser range finder, a grating instrument or an industrial camera.
The round steel length sensor adopts a laser range finder, a grating instrument or an industrial camera.
The industrial camera is arranged in the protective cover, the protective cover is an air-cooled protective sleeve, and the protective cover is arranged on the holder.
The data processing unit is a singlechip, a DSP, an ARM, a PLC or an industrial personal computer.
The display unit adopts a display, a nixie tube or a data interface of a higher-level control system.
The other purpose of the invention is realized by the following technical scheme:
a method for calculating the concentration of magnetic suspension in round steel magnetic powder flaw detection comprises the following steps:
the method for calculating the concentration of the magnetic suspension in the round steel magnetic powder inspection comprises the following steps:
s1, detecting the diameter of the round steel, and obtaining a first signal of the diameter of the round steel in real time;
s2, detecting the length of the round steel, and obtaining a first signal of the length of the round steel in real time;
s3, a data conversion and transmission step, wherein the measured round steel diameter first signal and the round steel length first signal are respectively converted into a round steel diameter second signal and a round steel length second signal which are suitable for a long-distance industrial transmission mode, and are output and transmitted;
s4, a data processing step, namely converting the round steel diameter second signal and the round steel length second signal into a round steel diameter calculation signal and a round steel length calculation signal which can be subjected to data calculation respectively, and defining the round steel diameter calculation signal and the round steel length calculation signal as a round steel diameter D and a round steel length L respectively; calculating the surface area of the round steel according to the diameter of the round steel and the length of the round steel, and calculating according to the concentration of the magnetic suspension consumed by the current round steel to obtain the concentration value of the magnetic suspension in the current round steel magnetic powder flaw detection;
and S5, a display step, namely displaying the concentration value of the magnetic suspension in the current round steel magnetic powder flaw detection.
In step S4, the calculation of the magnetic suspension concentration value in the current round steel magnetic powder inspection includes the following steps:
s41, calculating the current round steel surface area S according to the round steel diameter D and the round steel length L
S＝πDL；
S42, calculating the concentration rho of the magnetic suspension consumed by the current round steels
ρs＝αS；
Wherein the coefficient alpha represents the corresponding magnetic suspension concentration which needs to be consumed in the flaw detection of the round steel with a certain surface area, the calibration is carried out by twice or multiple off-line pear-shaped sedimentation tube methods, and the value of alpha is less than 0.01/lm2；
Magnetic suspension concentration rho consumed by current round steelsThe concentration of magnetic suspension consumed by the magnetic powder is taken away in the current flaw detection of the round steel;
s43, calculating the concentration value rho of the magnetic suspension in the current round steel magnetic powder inspection1
ρ1＝ρ0-ρs；
Where ρ is0The concentration of the original magnetic suspension is the concentration of the magnetic suspension before the round steel enters the flaw detection and is also the initial concentration of the magnetic suspension, and the concentration is obtained by offline measurement by a pear-shaped precipitation tube method; concentration value rho of magnetic suspension in current round steel magnetic powder flaw detection1The concentration of the magnetic suspension after consumption is removed from the current round steel magnetic powder inspection magnetic suspension box.
The invention has the beneficial effects that:
the device and the method for calculating the concentration of the magnetic suspension in the round steel magnetic powder flaw detection can calculate the concentration of the magnetic suspension in the round steel magnetic powder flaw detection in real time, and the calculation result is not easily influenced by the field environment. In addition, the calculation result of the invention can be displayed in real time, so that the operator can know the concentration of the magnetic suspension in real time, and the subsequent operation is facilitated.
The device has small maintenance amount and higher magnetic suspension concentration calculation precision in continuous production. To further illustrate the above objects, structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of a magnetic suspension concentration calculating device in round steel magnetic powder inspection according to the present invention;
FIG. 2 is a schematic diagram of the structure of one of the embodiments of the apparatus of FIG. 1;
FIG. 3 is a schematic diagram of a second embodiment of the apparatus of FIG. 1;
FIG. 4 is a schematic flow chart of a method for calculating the concentration of magnetic suspension in the round steel magnetic powder inspection according to the invention.
Detailed Description
The following describes in detail a specific embodiment of the present invention with reference to the drawings of the embodiment.
Referring to fig. 1, the apparatus for calculating the magnetic suspension concentration in the magnetic powder inspection of round steel according to the present invention comprises:
the round steel diameter sensor 2 is a sensor for detecting the diameter of the round steel 1 in real time and is used for measuring a first signal of the diameter of the round steel, and the round steel diameter sensor 2 adopts a laser range finder or a grating instrument or an industrial camera;
the round steel length sensor 3 is a sensor for detecting the length of the round steel 1 in real time and is used for measuring a first signal of the length of the round steel, and the round steel length sensor 3 adopts a laser range finder or a grating instrument or an industrial camera;
the data conversion and transmission module 4 is respectively connected with the round steel diameter sensor 2 and the round steel length sensor 3, and respectively converts the round steel diameter first signal and the round steel length first signal into a round steel diameter second signal and a round steel length second signal which are suitable for a long-distance industrial transmission form, outputs the round steel diameter second signal and the round steel length second signal and transmits the round steel length second signal;
the data processing module 5 is connected with the data conversion and transmission module 4, converts the second round steel diameter signal and the second round steel length signal into a round steel diameter calculation signal and a round steel length calculation signal which can be used for data calculation respectively, defines the round steel diameter calculation signal and the round steel length calculation signal as the round steel diameter and the round steel length respectively, calculates the round steel surface area by using the round steel diameter and the round steel length, and calculates the magnetic suspension concentration value in the current round steel magnetic powder inspection according to the magnetic suspension concentration consumed by the current round steel; the data processing unit 5 can select a singlechip, a DSP, an ARM, a PLC or an industrial personal computer and the like according to the requirements of data volume and processing speed;
the display module 6 is connected with the data processing module 5 and is used for displaying the concentration value of the magnetic suspension in the current round steel magnetic powder inspection, which is transmitted by the data processing module 5; the display unit 6 may be a display or a digital tube or a data interface of a higher-level control system according to the user's request.
The method for calculating the concentration of the magnetic suspension in the round steel magnetic powder inspection comprises the following steps:
s1, detecting the diameter of the round steel, and obtaining a first signal of the diameter of the round steel in real time;
s2, detecting the length of the round steel, and obtaining a first signal of the length of the round steel in real time;
s3, a data conversion and transmission step, wherein the measured round steel diameter first signal and the round steel length first signal are respectively converted into a round steel diameter second signal and a round steel length second signal which are suitable for a long-distance industrial transmission mode, and are output and transmitted;
s4, a data processing step, namely converting the round steel diameter second signal and the round steel length second signal into a round steel diameter calculation signal and a round steel length calculation signal which can be subjected to data calculation respectively, and defining the round steel diameter calculation signal and the round steel length calculation signal as a round steel diameter D and a round steel length L respectively; calculating the surface area of the round steel according to the diameter of the round steel and the length of the round steel, and calculating according to the concentration of the magnetic suspension consumed by the current round steel to obtain the concentration value of the magnetic suspension in the current round steel magnetic powder flaw detection;
and S5, a display step, namely displaying the concentration value of the magnetic suspension in the current round steel magnetic powder flaw detection.
In step S4, the calculation of the magnetic suspension concentration value in the current round steel magnetic powder inspection includes the following steps:
s41, calculating the current round steel surface area S according to the round steel diameter D and the round steel length L
S＝πDL；
S42, calculating the concentration rho of the magnetic suspension consumed by the current round steels
ρs＝αS；
Wherein the coefficient alpha represents the corresponding magnetic suspension concentration which needs to be consumed in the flaw detection of the round steel with a certain surface area, the calibration is carried out by twice or multiple off-line pear-shaped sedimentation tube methods, and the value of alpha is less than 0.01/lm2；
Magnetic suspension concentration rho consumed by current round steelsThe concentration of magnetic suspension consumed by the magnetic powder is taken away in the current flaw detection of the round steel;
s43, calculating the concentration value rho of the magnetic suspension in the current round steel magnetic powder inspection1
ρ1＝ρ0-ρs；
Where ρ is0The concentration of the original magnetic suspension is the concentration of the magnetic suspension before the round steel enters the flaw detection and is also the initial concentration of the magnetic suspension, and the concentration is obtained by offline measurement by a pear-shaped precipitation tube method; concentration value rho of magnetic suspension in current round steel magnetic powder flaw detection1The concentration of the magnetic suspension after consumption is removed from the current round steel magnetic powder inspection magnetic suspension box.
Several examples are given below.
Example 1:
referring to fig. 2, because the production site conditions are limited, the length and the diameter of the round steel need to be measured by a non-contact method, so that the round steel length sensor 31 and the round steel diameter sensor 21 in the embodiment both select a stable and reliable 1/1.8 "CCD and a 25-frame/second monochrome industrial CCD camera. The image (video) signal (the first signal of round steel diameter and the first signal of round steel length) of round steel length and diameter is gathered to industry camera, need to convey data conversion transmission module 41 in this embodiment and carry out signal conversion and transmission rear end equipment processing.
The field environment is comparatively abominable, and the industrial camera need be dustproof and the cooling, arranges the industrial camera in the safety cover, and the air-cooled protective sleeve is chooseed for use to the safety cover, and the safety cover selects suitable visual angle position firmly fixed, then needs additional cloud platform if need adjust the visual angle.
The interference factors of the production site are many, the video signal collected by the industrial camera needs to be transmitted to the data conversion transmission module 41 through the video cable with the protective sleeve, in addition, the data conversion transmission module 41 converts the video signal into an optical signal (a round steel diameter second signal and a round steel length second signal) and transmits the optical signal to the rear end for processing, so the data conversion transmission module 41 needs to transmit the data to the processing unit 51 through the optical fiber, the optical fiber has high transmission bandwidth and strong anti-interference capability, and is an ideal transmission mode, interference is reduced, and the signal to noise ratio is improved, so the data conversion transmission module 41 is composed of a front control cabinet and a video transmitting optical terminal which are arranged close to the industrial camera, and the video transmitting optical terminal converts the video signal into the optical signal (the round steel diameter second signal and the round steel length second signal) and transmits the optical signal to the rear end through the optical fiber. The video signal sent by the industrial camera enters the front control cabinet through the video cable with protection, and is converted into an optical signal with stronger anti-interference capability and longer transmission distance by the video transmitting optical terminal in the cabinet.
The data processing unit 51 is composed of a video receiving optical transceiver and an industrial personal computer, the data processing unit 51 is located in a back-end system control cabinet, and the system control cabinet is a main body of the whole device and can be usually placed in an electric room unified in a factory so as to be convenient for centralized maintenance and guarantee. The video receiving optical terminal in the system control cabinet restores the optical signal into a video signal (a round steel diameter calculation signal and a round steel length calculation signal which can perform data calculation, namely the round steel diameter and the round steel length) and sends the video signal into the industrial personal computer. Because the front end adopts an industrial CCD camera as a sensor, the back end data processing unit adopts an industrial personal computer with stronger calculation capability to calculate the diameter and the length and the concentration of the magnetic suspension, and the concentration value of the magnetic suspension obtained after the processing is sent to a display 61 in a control room for operators to use.
The diameter D of the current round steel to be measured is 0.1m, the length L of the round steel is 5m, and the concentration rho of the original magnetic suspension00.7g/l, coefficient alpha of 0.00625g/lm2And then the concentration value rho of the magnetic suspension in the current round steel magnetic powder inspection1The calculation is as follows:
(1) calculating the current round steel surface area S
S＝πDL＝1.57m2；
(2) Calculating the concentration rho of the magnetic suspension consumed by the current round steels
ρs＝αS＝0.009813g/l；
(3) Calculating the concentration value rho of magnetic suspension in the current round steel magnetic powder flaw detection1
ρ1＝ρ0-ρs＝0.690187g/l。
Example 2:
referring to fig. 3, under the condition of small interference at the production site, the round steel length sensor 32 and the round steel diameter sensor 22 in this embodiment both select 2 laser range finders, measure the first signal of the diameter of the round steel and the first signal of the length of the round steel, send the measured values to the data conversion transmission module 42 at the front end of the site, relay, amplify, convert into industrial ethernet signals (the second signal of the diameter of the round steel and the second signal of the length of the round steel) and send to the data processing module 52 (using an industrial personal computer) for processing, and send the concentration value of the magnetic suspension obtained after processing to the display 62 in the control room for the use of the operator.
The diameter D and the length L of the current round steel to be measured are respectively 0.2m and 6m, and the concentration rho of the original magnetic suspension00.5g/l, coefficient alpha of 0.0061g/lm2And then the concentration value rho of the magnetic suspension in the current round steel magnetic powder inspection1The calculation is as follows:
(1) calculating the current round steel surface area S
S＝πDL＝3.768m2；
(2) Calculating the concentration rho of the magnetic suspension consumed by the current round steels
ρs＝αS＝0.022985g/l；
(3) Calculating the concentration value rho of magnetic suspension in the current round steel magnetic powder flaw detection1
ρ1＝ρ0-ρs＝0.477015g/l。
Example 3:
the measured value is manually input into an input terminal at the front end of a field, converted into an industrial Ethernet signal and sent into an industrial personal computer for processing, and the concentration value of the magnetic suspension obtained after processing is sent to a display in a control room for use by an operator.
The diameter D of the currently measured round steel is 0.15m, the length L of the currently measured round steel is 10m, and the concentration rho of the original magnetic suspension00.9g/l, a coefficient alpha of 0.00655g/lm2. Then the concentration value rho of the magnetic suspension in the current round steel magnetic powder flaw detection1The calculation is as follows:
(1) calculating the current round steel surface area S
S＝πDL＝4.71m2；
(2) Calculating the concentration rho of the magnetic suspension consumed by the current round steels
ρs＝αS＝0.030851g/l；
(3) Calculating the concentration value rho of magnetic suspension in the current round steel magnetic powder flaw detection1
ρ1＝ρ0-ρs＝0.869149g/l。
It should be understood by those skilled in the art that the above embodiments are for illustrative purposes only and are not intended to limit the present invention, and that changes and modifications to the above embodiments may fall within the scope of the appended claims.
Claims (8)
1. The utility model provides a round steel magnetic powder is visited magnetic suspension concentration calculating device in wound, its characterized in that contains:
the round steel diameter sensor is used for detecting the diameter of the round steel in real time and measuring a first signal of the diameter of the round steel;
the round steel length sensor is used for detecting the length of the round steel in real time and measuring a first signal of the length of the round steel;
the data conversion and transmission module is respectively connected with the round steel diameter sensor and the round steel length sensor, and respectively converts the round steel diameter first signal and the round steel length first signal into a round steel diameter second signal and a round steel length second signal in a long-distance industrial transmission form, outputs the round steel diameter second signal and the round steel length second signal and transmits the round steel diameter second signal and the round steel length second signal;
the data processing module is connected with the data conversion and transmission module, converts the second round steel diameter signal and the second round steel length signal into a round steel diameter calculation signal and a round steel length calculation signal for data calculation respectively, defines the round steel diameter calculation signal and the round steel length calculation signal as the round steel diameter and the round steel length respectively, calculates the round steel surface area by using the round steel diameter and the round steel length, and calculates the magnetic suspension concentration value in the current round steel magnetic powder inspection according to the magnetic suspension concentration consumed by the current round steel;
the display module is connected with the data processing module and is used for displaying the concentration value of the magnetic suspension in the current round steel magnetic powder inspection transmitted by the data processing module,
the data processing module determines the initial concentration of the magnetic suspension, and then calculates the concentration value of the magnetic suspension in the current round steel magnetic powder flaw detection according to the initial concentration and the concentration of the magnetic suspension consumed by the current round steel.
2. The apparatus for calculating the concentration of magnetic suspension in round steel magnetic powder flaw detection according to claim 1, wherein:
the round steel diameter sensor adopts a laser range finder, a grating instrument or an industrial camera.
3. The apparatus for calculating the concentration of magnetic suspension in round steel magnetic powder flaw detection according to claim 1, wherein:
the round steel length sensor adopts a laser range finder, a grating instrument or an industrial camera.
4. The apparatus for calculating the concentration of magnetic suspension in round steel magnetic particle inspection according to claim 1 or 2, wherein:
the industrial camera is arranged in the protective cover, the protective cover is an air-cooled protective sleeve, and the protective cover is arranged on the holder.
5. The apparatus for calculating the concentration of magnetic suspension in round steel magnetic powder flaw detection according to claim 1, wherein:
the data processing unit is selected from DSP, ARM or PLC.
6. The apparatus for calculating the concentration of magnetic suspension in round steel magnetic powder flaw detection according to claim 1, wherein:
the display unit adopts a nixie tube or a data interface of a higher-level control system.
7. A method for calculating the concentration of magnetic suspension in round steel magnetic powder flaw detection is characterized by comprising the following steps:
the method for calculating the concentration of the magnetic suspension in the round steel magnetic powder flaw detection comprises the following steps:
s1, detecting the diameter of the round steel, and obtaining a first signal of the diameter of the round steel in real time;
s2, detecting the length of the round steel, and obtaining a first signal of the length of the round steel in real time;
s3, a data conversion and transmission step, wherein the measured round steel diameter first signal and the round steel length first signal are respectively converted into a round steel diameter second signal and a round steel length second signal which are suitable for a long-distance industrial transmission mode, and are output and transmitted;
s4, a data processing step, namely converting the round steel diameter second signal and the round steel length second signal into a round steel diameter calculation signal and a round steel length calculation signal which can be subjected to data calculation respectively, and defining the round steel diameter calculation signal and the round steel length calculation signal as a round steel diameter D and a round steel length L respectively; calculating the surface area of the round steel according to the diameter of the round steel and the length of the round steel, and calculating according to the concentration of the magnetic suspension consumed by the current round steel to obtain the concentration value of the magnetic suspension in the current round steel magnetic powder flaw detection;
s5, a display step, which is to display the concentration value of the magnetic suspension in the current round steel magnetic powder flaw detection,
wherein, step S4 includes: and determining the initial concentration of the magnetic suspension, and calculating to obtain the concentration value of the magnetic suspension in the current round steel magnetic powder flaw detection according to the initial concentration and the concentration of the magnetic suspension consumed by the current round steel.
8. The method for calculating the concentration of the magnetic suspension in the round steel magnetic powder inspection according to claim 7, wherein the method comprises the following steps:
in step S4, the calculation of the magnetic suspension concentration value in the current round steel magnetic powder inspection includes the following steps:
s41, calculating the current round steel surface area S according to the round steel diameter D and the round steel length L
S＝πDL；
S42, calculating the concentration rho of the magnetic suspension consumed by the current round steels
ρs＝αS；
Wherein the coefficient alpha represents the corresponding magnetic suspension concentration which needs to be consumed in the flaw detection of the round steel with a certain surface area, the concentration is calibrated by more than two off-line pear-shaped sedimentation tube methods, and the value of alpha is less than 0.01g/lm2；
Magnetic suspension concentration rho consumed by current round steelsThe concentration of magnetic suspension consumed by the magnetic powder is taken away in the current flaw detection of the round steel;
s43, calculating the concentration value rho of the magnetic suspension in the current round steel magnetic powder inspection1
ρ1＝ρ0-ρs；
Where ρ is0The concentration of the original magnetic suspension is the concentration of the magnetic suspension before the round steel enters the flaw detection and is also the initial concentration of the magnetic suspension, and the concentration is obtained by offline measurement by a pear-shaped precipitation tube method; magnetic suspension concentration in current round steel magnetic powder flaw detectionValue rho1The concentration of the magnetic suspension after consumption is removed from the current round steel magnetic powder inspection magnetic suspension box.
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| GB1458942A (en) * | 1974-03-25 | 1976-12-15 | Inst Dr Foerster Pruefgeraeteb | Method and apparatus for photo-electric determination of othe concentration of a suspension of magnetic powder particles which are fluorescently pigmented |
| WO1988005910A1 (en) * | 1987-02-04 | 1988-08-11 | Institut Khimii Tverdogo Tela I Pererabotki Minera | Device for determining the concentration of paramagnetic ions in solutions |
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| CN105784834A (en) * | 2016-04-05 | 2016-07-20 | 共享铸钢有限公司 | Magnetic suspension solution concentration determination device capable of accelerating magnetic powder precipitation |
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| CN103335926A (en) * | 2013-06-27 | 2013-10-02 | 南车戚墅堰机车车辆工艺研究所有限公司 | Method and device for measuring concentration of magnetic suspension for magnetic powder inspection |
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| CN105784834A (en) * | 2016-04-05 | 2016-07-20 | 共享铸钢有限公司 | Magnetic suspension solution concentration determination device capable of accelerating magnetic powder precipitation |
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