CN209945229U - Measuring tool for measuring width of two sides of air gap of magnetic core - Google Patents
Measuring tool for measuring width of two sides of air gap of magnetic core Download PDFInfo
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- CN209945229U CN209945229U CN201921070288.4U CN201921070288U CN209945229U CN 209945229 U CN209945229 U CN 209945229U CN 201921070288 U CN201921070288 U CN 201921070288U CN 209945229 U CN209945229 U CN 209945229U
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Abstract
The utility model discloses a measure measuring tool of two side width in magnetic core air gap, including interior scale, outer scale, insertion portion and handle, interior scale and outer scale are used for measuring the inboard width and the outside width of magnetic core air gap respectively, interior scale and outer scale are wedge structure and its narrow tip and link to each other through insertion portion, the handle is being connected to the wide tip of outer scale, the width of insertion portion is less than the width of magnetic core air gap, be provided with first scale mark and the second scale mark that is used for measuring the inboard width and the outside width of magnetic core air gap on interior scale and the outer scale respectively. The utility model discloses not only can once only accomplish the measurement to the inboard width of the magnetic core air gap of magnetic core and outside width, simplify operating procedure, improve measurement of efficiency, pass through the perfect match of measuring tool and magnetic core air gap structure moreover, the width value of magnetic core air gap directly presents on the measuring tool and measuring error can not appear basically, has improved measurement accuracy.
Description
Technical Field
The utility model relates to a system magnetic core preparation field, concretely relates to measuring tool that can measure the two side widths of magnetic core air gap simultaneously.
Background
The air gap magnetic core is widely applied to a magnetic collection loop of an electric quantity sensor, and is used as an electromagnetic induction core component, and the precision and the size management of the air gap have extremely important significance for the quality of a product.
The core air gap is ground using a resin abrasive cut sheet having a thickness equal to the air gap width G, as shown in fig. 1. The linear speed of the cutting grinding wheel gradually increases from inside to outside along the radial direction due to the fact that the speed of different point lines of the cutting grinding wheel is in direct proportion to the radius of the cutting grinding wheel. This results in a difference in the width of the air gap between the inside and outside of the core: i.e. G1< G2. This is the so-called "bell mouth phenomenon".
Therefore, the inner gap width and the outer gap width of each air-gap core are required to be measured respectively, and whether the inner and outer width values of the air gap of the core are within the tolerance range is determined. These gauges all have the following disadvantages in practical use:
1. the widths of the inner side and the outer side of the air gap of the magnetic core need to be measured respectively every time, the operation actions are more, and the efficiency is lower.
2. The feeler gauge, the vernier caliper or the special feeler gauge have certain measuring errors, and the measuring precision is difficult to ensure.
3. Due to structural limitations of the air-gap magnetic core, especially for measurement of the inner end of the air gap of the magnetic core, certain space limitations exist, and measurement personnel are difficult to perform rapid and accurate measurement.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the measuring tool capable of simultaneously measuring the widths of the two sides of the air gap of the magnetic core is provided, the measuring efficiency is high, and the measuring tool has extremely high measuring precision.
The technical scheme is as follows: in order to realize the above-mentioned purpose, the utility model provides a measure of two side width in measurement magnetic core air gap, including interior scale, outer scale, insertion portion and handle, interior scale and outer scale are used for measuring the inboard width and the outside width of magnetic core air gap respectively, interior scale and outer scale are wedge structure and its narrow tip and link to each other through insertion portion, the handle is being connected to the wide tip of outer scale, the width of insertion portion is less than the width of magnetic core air gap, be provided with the first scale mark and the second scale mark that are used for measuring the inboard width and the outside width of magnetic core air gap on interior scale and the outer scale respectively.
Further, the structure and the size of the inner detection ruler and the outer detection ruler are the same.
Furthermore, a hand holding groove is formed in the handle.
Furthermore, the inner measuring scale, the outer measuring scale, the inserting part and the handle are integrally formed, so that the whole measuring tool has excellent structural strength.
Further, the width of the wide end parts of the inner detection ruler and the outer detection ruler is respectively larger than the inner width and the outer width of the air gap of the magnetic core, so that the measurement can be realized.
The specific setting method of the scale value points of the first scale mark and the second scale mark comprises the following steps:
the first scale mark and the second scale mark are respectively provided with five scale value points which are D, B, A, C, E and d, b, a, c and e respectively, the scale value of each scale value point is equal to the thickness of the detection ruler at the position, the nominal width of the air gap of the magnetic core to be detected is G, the tolerance is +/-a, and then the definition is as follows:
A＝G，D＝G+a，E＝G-a，B＝G+a/2，C＝G-a/2
a＝G，d＝G+a，e＝G-a，b＝G+a/2，c＝G-a/2
like this accessible magnetic core air gap inner port drop on the position on interior scale, or magnetic core air gap outer port drop on the position on the outer scale, read the numerical value of the interior outer port width of magnetic core air gap respectively, and the reading of every scale mark is the accurate value, and the reading between the scale mark is the estimated value, and reading error is less than a/2, measures the precision promptly and equals a/2. And whether the size of the air gap of the magnetic core is qualified or not can be qualitatively and visually judged according to the relative positions of the inner port and the outer port of the air gap of the magnetic core, which fall on D, B, A, C, E and d, b, a, c and e respectively.
Has the advantages that: compared with the prior art, the utility model, not only can once only accomplish the measurement to the inboard width of magnetic core air gap and the outside width of magnetic core, simplify operating procedure, improve measurement of efficiency, through the perfect match of measuring tool and magnetic core air gap structure moreover, the width value of magnetic core air gap directly presents on the measuring tool, and its measuring accuracy can reach the half of requiring the tolerance value, has improved measuring accuracy.
Drawings
FIG. 1 is a schematic view of a wound core;
FIG. 2 is a schematic structural view of the present invention;
fig. 3 is a schematic plan view of the present invention.
Detailed Description
The invention will be further elucidated with reference to the drawings and the specific embodiments.
As shown in fig. 2, the utility model provides a measure of two side width in measurement magnetic core air gap, including interior dipstick 2, outer dipstick 4, insertion portion 3 and handle 1, interior dipstick 2 is wedge structure and size of a dimension the same with outer dipstick 4, the narrow end of interior dipstick 2 and outer dipstick 4 links to each other through insertion portion 3, handle 1 is being connected to the wide end of outer dipstick 4, be provided with first scale 6 and the second scale 7 that are used for measuring the inboard width of magnetic core air gap and outside width on interior dipstick 2 and the outer dipstick 4 respectively, interior dipstick 2, outer dipstick 4, insertion portion 3 and handle 1 integrated into one piece, the width of the wide end of interior dipstick 2 and outer dipstick 4 is greater than the inboard width and the outside width of magnetic core air gap respectively, be provided with on the handle 1 and hold groove 5.
Referring to fig. 1 to 3, in the present embodiment, the thickness of the handle 1 is slightly greater than the thicknesses of the inner scale 2 and the outer scale 4, the length of the insertion portion 3 is slightly greater than the length of the core air gap 101 of the wound core 10, D, B, A, C, E four mark points are marked on the first scale line 6, which represent scale values of 3.1mm, 3.05mm, 3.0mm, 2.95mm and 2.90mm, respectively, and d, b, a, c and e four mark points are marked on the second scale line 7, which also represent scale values of 3.1mm, 3.05mm, 3.0mm, 2.95mm and 2.90mm, respectively.
In the present embodiment, the gauge is used to measure the inside width and the outside width of the core air gap 101 of the wound core 10, the standard value of the width of the core air gap 101 is 3.0mm, and the tolerance requires that the difference between the inside width and the outside width is within ± 0.1mm, and the specific measuring method comprises the following steps:
1. firstly, a worker holds the handle 1 by holding the groove 5;
2. moving the insertion portion 3 into the core air gap 101 from the side;
3. then, the measuring tool is pushed inwards linearly along the direction of the magnetic core air gap 101 until the outer detection ruler 4 is clamped by the outer port of the magnetic core air gap 101, and at the moment, a worker directly reads the scale value of the outer port of the magnetic core air gap 101 on the outer detection ruler 4, namely the outer side width value of the magnetic core air gap 101;
4. then, the measuring tool is pulled outwards along the direction of the magnetic core air gap 101 until the inner detection ruler 2 is clamped by the inner port of the magnetic core air gap 101, and at the moment, a worker directly reads the scale value of the inner port of the magnetic core air gap 101 on the inner detection ruler 2, namely the inner side width value of the magnetic core air gap 101;
5. and finally, comparing the outer width value and the inner width value of the magnetic core air gap 101 with the nominal tolerance value (+/-0.1 mm), and judging whether the magnetic core air gap 101 is qualified or not and how the magnetic core air gap is accurate.
In the above process, it can be visually and rapidly determined whether the magnetic core air gap 101 is qualified or not by marking D, B, A, C, E five identification points on the first scale mark 6 and d, b, a, c and e five identification points on the second scale mark 7, specifically: if the outside width value and the inside width value are respectively between B and C, and B and C, the magnetic core is a qualified product, and the tolerance of the air gap 101 is within +/-0.05 mm; if the outside width value and the inside width value are respectively between B and D and between B and D, the magnetic core is a qualified product, but the tolerance of the magnetic core is +/-0.5-0.1 mm; and if the outside width value and the inside width value exceed D and E and D and E respectively, the magnetic core is unqualified.
In this embodiment, the core air gaps 101 of five wound cores 10 are respectively detected, and the specific results are as follows:
Claims (6)
1. a measuring tool for measuring the width of two sides of an air gap of a magnetic core is characterized in that: including interior scale, outer scale, insertion portion and handle, interior scale and outer scale are used for measuring the inboard width and the outside width of magnetic core air gap respectively, interior scale and outer scale are wedge structure and its narrow tip and link to each other through the insertion portion, the handle is being connected to the wide tip of outer scale, the width of insertion portion is less than the width of magnetic core air gap, be provided with first scale mark and the second scale mark that is used for measuring the inboard width and the outside width of magnetic core air gap on interior scale and the outer scale respectively.
2. The gauge according to claim 1, wherein: the inner detection ruler and the outer detection ruler are identical in structure and size.
3. The gauge according to claim 1, wherein: the handle is provided with a hand holding groove.
4. The gauge according to claim 1, wherein: the inner measuring scale, the outer measuring scale, the inserting part and the handle are integrally formed.
5. The gauge according to claim 1, wherein: the widths of the wide end parts of the inner detection ruler and the outer detection ruler are respectively larger than the inner width and the outer width of the air gap of the magnetic core.
6. The gauge according to claim 1, wherein: the scale values on the first scale mark and the second scale mark are respectively the width of the horizontal section of the inner detection ruler and the width of the horizontal section of the outer detection ruler at the position.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921070288.4U CN209945229U (en) | 2019-07-10 | 2019-07-10 | Measuring tool for measuring width of two sides of air gap of magnetic core |
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| CN201921070288.4U CN209945229U (en) | 2019-07-10 | 2019-07-10 | Measuring tool for measuring width of two sides of air gap of magnetic core |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117268248A (en) * | 2023-11-21 | 2023-12-22 | 国网辽宁省电力有限公司 | Method and device for measuring magnetic characteristics of magnetic core of transformer |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117268248A (en) * | 2023-11-21 | 2023-12-22 | 国网辽宁省电力有限公司 | Method and device for measuring magnetic characteristics of magnetic core of transformer |
| CN117268248B (en) * | 2023-11-21 | 2024-01-26 | 国网辽宁省电力有限公司 | Method and device for measuring magnetic characteristics of magnetic core of transformer |
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