CN110297276A - Metal detection device - Google Patents
Metal detection device Download PDFInfo
- Publication number
- CN110297276A CN110297276A CN201910667046.1A CN201910667046A CN110297276A CN 110297276 A CN110297276 A CN 110297276A CN 201910667046 A CN201910667046 A CN 201910667046A CN 110297276 A CN110297276 A CN 110297276A
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- Prior art keywords
- coiled material
- metal
- metal detector
- deviation
- metal detection
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- 239000002184 metal Substances 0.000 title claims abstract description 98
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 98
- 238000001514 detection method Methods 0.000 title claims abstract description 64
- 239000000463 material Substances 0.000 claims abstract description 130
- 230000007704 transition Effects 0.000 claims description 11
- 230000010355 oscillation Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 10
- 230000006698 induction Effects 0.000 description 7
- 238000007689 inspection Methods 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000001788 irregular Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 230000005674 electromagnetic induction Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical group [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 241000416536 Euproctis pseudoconspersa Species 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/02—Registering, tensioning, smoothing or guiding webs transversely
- B65H23/0204—Sensing transverse register of web
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Life Sciences & Earth Sciences (AREA)
- Electromagnetism (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The invention discloses a kind of metal detection devices, for detecting whether coiled material contains metallics, it include: the metal detector for detecting metallics, the first side set on the metal detector and positional shift device for coiled material described in reciprocally swinging, and second side set on the metal detector and material Deviation rectifier for rectifying a deviation to coiled material;Second side of the metal detector is the side opposite with the first side of the metal detector.Metal detection device of the invention improves the reliability that metal detector detects web material metallic foreign body, substantially reduces false dismissal probability in the premise for not increasing metal detector quantity additionally.
Description
Technical field
The present invention relates to metal detection fields, more particularly to a kind of metal detection device.
Background technique
Metal detector on the market at present, is usually used Faraday's electromagnetic induction law as design principle, there is gold
Belong to or other objects with stronger electric conductivity are when passing through, because " being moved in magnetic field described in Faraday's electromagnetic induction law
And the conductor both ends of cutting magnetic induction line will appear potential difference " phenomenon, cause by metal with potential difference to closed line
The stabilizing magnetic field in circle center causes to disturb, and the electric current in disturbed magnetic field reverse influence closing coil changes, metal inspection
Survey instrument detects that curent change is considered as and detects that metal passes through.The raw material of amenities are generally the form of coiled material, logical
When crossing metal detector, generally in a suspended manner straight line by the penetrating hole of detection zone, that is, rectangle of metal detector, if
There is metallic foreign body attachment on raw material, then metal detector can signal an alert.In the industrial application of metal detector, absolutely
Most metallic foreign body is all not no regular shape, is substantially occurred with particulate, fine strip shape or filament shape,
Above-mentioned metallic foreign body mixes not can guarantee its direction for passing through metal detector detection zone in the product, that is, not can guarantee one
Surely the magnetic induction line of metal detector can be cut, and then not can guarantee the effect of metal detection, leads to have certain probability to occur
The problem of metallic foreign body missing inspection.
Summary of the invention
Based on this, the invention reside in overcome the prior art not can guarantee metallic foreign body to pass through metal detector detection zone
Direction, and then not can guarantee the effect of metal detection, lead to there is certain probability the problem of metallic foreign body missing inspection defect occur, mentions
For a kind of metal detection device.
Its technical solution is as follows:
A kind of metal detection device, for detecting whether coiled material contains metallics, comprising: for detecting metallics
Metal detector, the first side set on the metal detector and positional shift device for coiled material described in reciprocally swinging, and
Set on the metal detector second side and for the material Deviation rectifier rectified a deviation to coiled material;The of the metal detector
Two sides are the side opposite with the first side of the metal detector.
The metal detection device of the technical program improves metal inspection in the premise for not increasing metal detector quantity additionally
The reliability that instrument detects web material metallic foreign body is surveyed, false dismissal probability is substantially reduced.Specifically, the technical program is in raw material
Before coiled material enters metal detector, increase the positional shift device that reciprocally swinging is carried out to coiled material, raw material coiled material is by position
It when setting deviator, is swung therewith, so that coiled material is advanced when passing through the detection zone of metal detector from the straight line of script
Mode become fluctuation-type row advance so that metallic foreign body pass through metal detector detection zone when direction multiplicity,
Whether irregular particulate, fine strip shape or filamentous metallic foreign body, no matter its placement location, significantly
The probability for carrying out cutting movement with magnetic induction line in magnetic field is increased, keeps the effective sectional area of metallic foreign body cutting magnetic induction line maximum
Change, to improve the reliability of metal detection, prevents the detection leakage phenomenon occurred by the placement direction of metallic foreign body substantially.Work as gold
After belonging to detector test, increases a material Deviation rectifier, revert to the coiled material for leaving metal detector detection zone directly
The mode that line is advanced enters in next process.
It is flat that the direction that the positional shift device swings coiled material in one of the embodiments, which meets the fluctuation direction of coiled material,
Row plane where coiled material, and it is vertical with the direction of travel of coiled material.
In one of the embodiments, the positional shift device be circular arc type reciprocally swinging, and amplitude of fluctuation be ± 20 ° extremely
±30°;The plane of oscillation of the positional shift device is parallel to plane where coiled material.
The metal detector includes for the detection window by coiled material, the detection in one of the embodiments,
The width of window is greater than the width of coiled material.
The width of the detection window is twice of web width in one of the embodiments,.
The spacing of the positional shift device and the metal detector is more than or equal to coiled material in one of the embodiments,
Twice of width.
The spacing of the material Deviation rectifier and the metal detector is more than or equal to coiled material in one of the embodiments,
Twice of width.
The positional shift device includes the swinging mounting for swinging coiled material in one of the embodiments, as described
First support portion of the swing pivot of swinging mounting, and the driving swinging mounting swung around first support portion first
Pusher.
The material Deviation rectifier includes the deviation-rectifying bracket for correcting coiled material in one of the embodiments, as described
Second support portion of the swing pivot of deviation-rectifying bracket, the second promotion for driving the deviation-rectifying bracket to swing around second support portion
Device, the sensor deviated for detecting coiled material, and receive the sensor signal and control the second pusher movement
Controller.
It in one of the embodiments, further include set on the transition between the positional shift device and the metal detector
Roller, and the transition roller between the material Deviation rectifier and the metal detector.
Detailed description of the invention
Fig. 1 is the schematic top plan view of metal detection device described in the embodiment of the present invention;
Fig. 2 is the schematic side view of metal detection device described in the embodiment of the present invention;
Fig. 3 is the structural schematic diagram one of the positional shift device in Fig. 1;
Fig. 4 is the structural schematic diagram two of the positional shift device in Fig. 1;
Fig. 5 is the structural schematic diagram one of the material Deviation rectifier in Fig. 1;
Fig. 6 is the structural schematic diagram two of the material deviator in Fig. 1.
Description of symbols:
10, coiled material;20, metal detector;21, detection window;30, positional shift device;31, swinging mounting;32, first
Support part;33, the first pusher;34, mounting seat;40, material Deviation rectifier;41, deviation-rectifying bracket;42, the second support portion;43, it passes
Sensor;44, controller;50, transition roller.
Specific embodiment
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.In attached drawing
Give better embodiment of the invention.But the invention can be realized in many different forms, however it is not limited to herein
Described embodiment.On the contrary, the purpose of providing these embodiments is that making to understand more the disclosure
Add thorough and comprehensive.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term as used herein "and/or" includes one or more
Any and all combinations of relevant listed item.
Heretofore described " first ", " second " do not represent specific quantity and sequence, are only used for the differentiation of title.
A kind of metal detection device as Figure 1-Figure 2, for detecting whether coiled material 10 contains metallics, comprising:
For detecting the metal detector 20 of metallics, set on the metal detector 20 the first side and for described in reciprocally swinging
The positional shift device 30 of coiled material 10, and set on the metal detector 20 second side and for rectifying a deviation to coiled material 10
Material Deviation rectifier 40;Second side of the metal detector 20 is the side opposite with the first side of the metal detector 20.
The metal detection device of present embodiment improves metal in the premise for not increasing by 20 quantity of metal detector additionally
Detector 20 substantially reduces false dismissal probability to the reliability of 10 material metal foreign bodies detection of coiled material.Specifically, present embodiment exists
Before raw material coiled material 10 enters metal detector 20, increase the positional shift device 30 that reciprocally swinging is carried out to coiled material 10, it is former
It when material web 10 is by positional shift device 30, is swung therewith, so that coiled material 10 is in the detection for passing through metal detector 20
Become fluctuation-type row from the mode that the straight line of script is advanced when region to advance, so that metallic foreign body is passing through metal detector
Direction when 20 detection zone is various, whether irregular particulate, fine strip shape or filamentous metallic foreign body, no matter
How is its placement location, has increased considerably the probability for carrying out cutting movement with magnetic induction line in magnetic field, has cut metallic foreign body
The effective sectional area of magnetic induction line maximizes, to improve the reliability of metal detection, prevents the placement side because of metallic foreign body substantially
To and occur detection leakage phenomenon.After metal detector 20 detects, increase a material Deviation rectifier 40, makes to leave metal inspection
The coiled material 10 for surveying 20 detection zone of instrument reverts to the mode that straight line is advanced and enters in next process.
It is parallel that the direction that positional shift device 30 described in present embodiment swings coiled material 10, which meets the fluctuation direction of coiled material 10,
In 10 place plane of coiled material, and vertical with the direction of travel of coiled material 10 so that coiled material 10 on position deviator 40 with
" several " font passes through, and follows positional shift device 30 to swing and the synchronous hunting in being advanced, so that coiled material 10 is passing through gold
It had not only been parallel to the movement speed of direction of travel when belonging to the detection zone of detector 20, but also has had the mobile speed perpendicular to direction of travel
Degree increases the probability that magnetic induction line carries out cutting movement.
Positional shift device 30 described in present embodiment is circular arc type reciprocally swinging, and amplitude of fluctuation is ± 20 ° to ± 30 °;
The plane of oscillation of the positional shift device 30 is parallel to 10 place plane of coiled material, to guarantee that the fluctuation direction of coiled material 10 is to be parallel to
10 place plane of coiled material, and it is vertical with the direction of travel of coiled material 10, passed through with the fluctuation of " several " font.
Metal detector 20 described in present embodiment includes the detection window 21 for passing through coiled material 10, i.e., the described detection window
Mouth 21 is detection zone, and the width of the detection window 21 is greater than the width of coiled material 10.To prevent detected material and detection metal
Instrument 20 occurs friction and causes electrostatic, and the accuracy of interference detection results, metal detector 20 is in 10 detection station of coiled material
In use, 10 material width of coiled material detected need to be less than the width of detection window 21.
Due to present embodiment when advancing to advance in the fluctuation of 10 place plane of coiled material, so the inspection of present embodiment
The width for surveying window 21 is twice of 10 width of coiled material, guarantees that detection window 21 is sufficiently wide so that coiled material 10 fluctuates detection of advancing.
In other embodiments, the width of detection window 21 can also suitably be increased.
In view of the fluctuation-type that the traveling mode of raw material coiled material 10 is changed to 10 place plane of coiled material advances, direction is fluctuated
Amplitude is big when must advance than straight line, it is therefore desirable to increase the longest edge side length of detection window 21.But due to metal detector
The most length of short sides of the main examined window 21 of effect influence maximum, and the elongated variation of longest edge influences less, therefore should
Actually to the detection effect of metal detector 20, there is no apparent negative effects for change.
When coiled material 10 by positional shift device 30 drive swing after, need to there are enough distances to swing it sufficiently, make coiled material 10
Fluctuating range when passing through metal detector 20 is sufficiently large, guarantees the cutting speed of all directions, increases metallic foreign body interference
The effect in magnetic field.So the spacing of the positional shift device 30 and the metal detector 20 is set greater than equal to coiled material 10
Twice of width.Present embodiment is preferably that the spacing of the positional shift device 30 and the metal detector 20 is equal to coiled material 10
Twice of width.
Meanwhile after coiled material 10 leaves metal detector 20, need to rectify a deviation to coiled material 10, when in the fluctuation width of coiled material 10
When wave crest or trough when degree is maximum are rectified a deviation, difficulty of rectifying a deviation will be increased, so in order to avoid this is happened, the material correction
The spacing of device 40 and the metal detector 20 is set greater than twice of the width equal to coiled material 10, avoids big in fluctuating range
When rectify a deviation to coiled material 10.Preferably, present embodiment is set as the material Deviation rectifier 40 and the metal detector 20
Spacing be equal to twice of width of coiled material 10.
As Figure 3-Figure 4, positional shift device 30 described in present embodiment includes the swinging mounting for swinging coiled material 10
31, the first support portion 32 of the swing pivot as the swinging mounting 31, and the driving swinging mounting 31 is around described the
The first pusher 33 that one support portion 32 is swung.The positional shift device 30 further includes being set to mounting seat 34, and described first
Support part 32 is set between swinging mounting 31 and mounting seat 34 and connects swinging mounting 31 and mounting seat 34, and described first pushes
Device 33 is set in mounting seat 34, and first pusher 33 includes the telescopic rod that can carry out reciprocal telescopic movement, described to stretch
The telescopic direction of contracting bar and is parallel to 10 place plane of coiled material perpendicular to the direction of travel of coiled material 10;The telescopic rod and swing
Bracket 31 connects, and swinging mounting 31 is driven to carry out circular arc type reciprocally swinging around the first support portion 32.Specifically, the swing branch
Frame 31 includes the pan feeding side that coiled material 10 enters and the exit side that coiled material 10 exports, and the telescopic rod junction is close to swing branch
The exit side of frame 31, first support portion 32 are set to the midline position of the pan feeding side, so that wave when coiled material 10 exports
It is dynamic to advance.
As shown in Fig. 5-Fig. 6, material Deviation rectifier 40 described in present embodiment includes the deviation-rectifying bracket for correcting coiled material 10
41, the second support portion 42 of the swing pivot as the deviation-rectifying bracket 41 drives the deviation-rectifying bracket 41 around described second
The second pusher (not shown) that support part 42 is swung, the sensor 43 deviated for detecting coiled material 10, and described in reception
43 signal of sensor and the controller 44 for controlling the second pusher movement.The structure and principle of the material Deviation rectifier 40 with
Positional shift device 30 is similar, and difference is, advances since coiled material 10 needs to restore original straight line after material Deviation rectifier 40,
Therefore in order to guarantee to restore precision, need to add sensor 43 and controller 44 on material Deviation rectifier 40 again, the sensor 43 is set
It is aligned in the detection zone center line of exit side, and the sensor 43 with the edge of coiled material 10;When sensor 43 detects
When coiled material 10 is to the left or right side shifts, then controller 44 controls pusher movement, drives deviation-rectifying bracket 41 to opposite direction
It swings, coiled material 10 is made to keep straight line to advance after through material Deviation rectifier 40.When coiled material 10 is the coiled material of irregular shape, institute
The quantity for stating sensor 43 is two, and two sensors 43 are respectively arranged on the both ends of exit side, respectively with the two of coiled material 10
Side edge-justified calibrations;When coiled material 10 is regular shape, then the sensor 43 can be positioned only at exit side one end and coiled material 10 1
Correction precision detection can be realized in side edge-justified calibrations.
Present embodiment further includes the transition roller 50 being set between the positional shift device 30 and the metal detector 20,
And the transition roller 50 between the material Deviation rectifier 40 and the metal detector 20.The setting one of the transition roller 50
Aspect improves 10 tensile force of coiled material and provides certain frictional force, guarantees swing and rectifying effect;On the other hand, the transition roller
50 be arranged in increases the travel distance of coiled material 10 under the premise of not increasing device overall length, guarantee 10 laser propagation effect of coiled material.This
The outer wall surface of transition roller 50 described in embodiment passes through Teflon spray treatment, so that between transition roller 50 and coiled material 10
Frictional force is sufficiently small, avoids frictional force excessive and impact position deviator 30 is to the offset effect and material Deviation rectifier 40 of coiled material 10
To the rectifying effect of coiled material.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of metal detection device, for detecting whether coiled material contains metallics characterized by comprising for detecting
The metal detector of metallics, set on the metal detector the first side and position for coiled material described in reciprocally swinging it is inclined
Move device, and set on the metal detector second side and for the material Deviation rectifier rectified a deviation to coiled material;The metal
Second side of detector is the side opposite with the first side of the metal detector.
2. metal detection device according to claim 1, which is characterized in that the positional shift device swings the direction of coiled material
Meet the fluctuation direction of coiled material to be parallel to plane where coiled material, and vertical with the direction of travel of coiled material.
3. metal detection device according to claim 1, which is characterized in that the positional shift device is circular arc type toward physical pendulum
It is dynamic, and amplitude of fluctuation is ± 20 ° to ± 30 °;The plane of oscillation of the positional shift device is parallel to plane where coiled material.
4. metal detection device according to claim 1, which is characterized in that the metal detector includes for passing through volume
The detection window of material, the width of the detection window are greater than the width of coiled material.
5. metal detection device according to claim 4, which is characterized in that the width of the detection window is web width
Twice.
6. metal detection device according to claim 1, which is characterized in that the positional shift device and the metal detection
The spacing of instrument is more than or equal to twice of the width of coiled material.
7. metal detection device according to claim 1, which is characterized in that the material Deviation rectifier and the metal detection
The spacing of instrument is more than or equal to twice of the width of coiled material.
8. metal detection device according to claim 1, which is characterized in that the positional shift device includes for swinging volume
The swinging mounting of material, the first support portion of the swing pivot as the swinging mounting, and the driving swinging mounting are around institute
State the first pusher of the first support portion swing.
9. metal detection device according to claim 1, which is characterized in that the material Deviation rectifier includes for correcting volume
The deviation-rectifying bracket of material, the second support portion of the swing pivot as the deviation-rectifying bracket drive the deviation-rectifying bracket around described
The second pusher that two support portions are swung, the sensor deviated for detecting coiled material, and receive the sensor signal and control
Make the controller of the second pusher movement.
10. -9 described in any item metal detection devices according to claim 1, which is characterized in that further include being set to the position
Transition roller between deviator and the metal detector, and be set between the material Deviation rectifier and the metal detector
Transition roller.
Priority Applications (1)
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CN201910667046.1A CN110297276B (en) | 2019-07-23 | 2019-07-23 | Metal detection device |
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CN201910667046.1A CN110297276B (en) | 2019-07-23 | 2019-07-23 | Metal detection device |
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CN110297276B CN110297276B (en) | 2024-06-11 |
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---|---|---|---|---|
JP2005214789A (en) * | 2004-01-29 | 2005-08-11 | Anritsu Sanki System Co Ltd | Metal detection device |
CN205192467U (en) * | 2015-11-30 | 2016-04-27 | 郑州金泰制罐有限公司 | Metal sheet on -line measuring device |
JP2017058215A (en) * | 2015-09-16 | 2017-03-23 | トック・エンジニアリング株式会社 | Metal foreign matter detection device |
CN106646628A (en) * | 2016-12-30 | 2017-05-10 | 合肥通用机械研究院 | Metal-detector-based metal detection device and metal detection method thereof |
CN109082872A (en) * | 2018-09-05 | 2018-12-25 | 佛山市特丝纳纺织科技有限公司 | A kind of metal detecting device for spinning |
CN210181236U (en) * | 2019-07-23 | 2020-03-24 | 广州市贝云科技有限公司 | Metal detection device |
-
2019
- 2019-07-23 CN CN201910667046.1A patent/CN110297276B/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005214789A (en) * | 2004-01-29 | 2005-08-11 | Anritsu Sanki System Co Ltd | Metal detection device |
JP2017058215A (en) * | 2015-09-16 | 2017-03-23 | トック・エンジニアリング株式会社 | Metal foreign matter detection device |
CN205192467U (en) * | 2015-11-30 | 2016-04-27 | 郑州金泰制罐有限公司 | Metal sheet on -line measuring device |
CN106646628A (en) * | 2016-12-30 | 2017-05-10 | 合肥通用机械研究院 | Metal-detector-based metal detection device and metal detection method thereof |
CN109082872A (en) * | 2018-09-05 | 2018-12-25 | 佛山市特丝纳纺织科技有限公司 | A kind of metal detecting device for spinning |
CN210181236U (en) * | 2019-07-23 | 2020-03-24 | 广州市贝云科技有限公司 | Metal detection device |
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