CN109596863B - Tested part fixing clamp for Helmholtz coil test - Google Patents
Tested part fixing clamp for Helmholtz coil test Download PDFInfo
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- CN109596863B CN109596863B CN201811465946.XA CN201811465946A CN109596863B CN 109596863 B CN109596863 B CN 109596863B CN 201811465946 A CN201811465946 A CN 201811465946A CN 109596863 B CN109596863 B CN 109596863B
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- helmholtz coil
- middle shaft
- rod
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- connecting rods
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- 238000012360 testing method Methods 0.000 title claims abstract description 34
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 239000011810 insulating material Substances 0.000 claims description 8
- 229920006351 engineering plastic Polymers 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 abstract description 9
- 239000000463 material Substances 0.000 description 5
- 239000004033 plastic Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0425—Test clips, e.g. for IC's
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a tested part fixing clamp for a Helmholtz coil test, which consists of a middle shaft lever and two connecting rods sleeved on the middle shaft lever, wherein the positions of the two connecting rods on the middle shaft lever are adjustable; each connecting rod consists of a supporting block and 3-4 telescopic supporting rods which are fixed on the supporting block and uniformly distributed in a radial circumference mode, the lengths of the telescopic supporting rods are the same, and the connecting rods are installed in the Helmholtz coil through acting force and reacting force when the tail end of each telescopic supporting rod is in contact with the inner side of the Helmholtz coil; a through hole for penetrating through the middle shaft lever is formed in the middle of each supporting block; a groove for placing an experimental test piece is formed in the center of the middle shaft rod, and the middle shaft rod and the Helmholtz coil are coaxially arranged. This anchor clamps can be fast accurately be fixed in the homogeneous magnetic field region of helmholtz coil positive centre with the experiment test piece, and can be applied to not unidimensional helmholtz coil.
Description
Technical Field
The invention relates to a Helmholtz coil testing device, in particular to a tested piece fixing clamp for Helmholtz coil testing.
Background
A helmholtz coil is a device used to produce a uniform magnetic field over a small region. The Helmholtz coil is composed of a pair of identical conductor coils with circular or square cross sections, the two coils are mutually parallel and coaxially arranged, the distance between the two coils is equal to the radius of the coils, and the coils are internally provided with equidirectional current. This produces a highly uniform magnetic field at the center of the two coils.
Helmholtz coils are widely used in many electromagnetic research fields, such as generation of a standard magnetic field, cancellation and compensation of an earth magnetic field, simulation of a geomagnetic environment, determination of a magnetic shielding effect, electromagnetic interference simulation experiments, calibration of a Hall probe and various magnetometers, research of a biological magnetic field, research of magnetic properties of substances, and the like.
Since the region of uniform magnetic field of the helmholtz coil is midway between the two coil axes, the magnetic field direction is strictly parallel to the two coil axis directions. Therefore, in the experiment, the space placing position and the direction of the measured piece have high requirements.
At present, a common solution is to place a stage in the coil and then fix the test object on the stage by tape or other similar methods. The objective table that prior art used is mostly the cuboid platform, directly places in the helmholtz coil. However, the Helmholtz coil is in a circular ring shape, and the placing level of the cuboid object stage is difficult to ensure. And because the objective table is difficult to modify its size after often doing, the reuse rate is low, to the Helmholtz coil of different sizes, just need use the objective table of equidimension not, very inconvenient. In addition, the fixing mode of the object stage is unstable regardless of the object stage and a measured piece on the object stage, and the object stage cannot be used in outdoor wind environment. Moreover, if the operation is improper when the tested piece is fixed, the tested piece is easy to be damaged.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a fixing clamp for a tested part for a Helmholtz coil test. The geometric construction of the clamp ensures that the clamp can be accurately positioned in a uniform magnetic field area in the middle of the Helmholtz coil, and ensures that the direction of a measured piece is parallel to the direction of the magnetic field. This anchor clamps have scalability, have guaranteed that this anchor clamps have better multiplexing ability, and one set of anchor clamps can use to the helmholtz coil of different sizes. The structure is simple in mounting and dismounting, and is convenient for multiple tests at different time and different places. And this structure fixity is good, can not violently damage the experimental measured piece, also is convenient for experiment under different environment such as field.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a tested part fixing clamp for a Helmholtz coil test, which is characterized by comprising a middle shaft rod and two connecting rods sleeved on the middle shaft rod, wherein the positions of the two connecting rods on the middle shaft rod are adjustable; each connecting rod consists of a supporting block and 3-4 telescopic supporting rods which are fixed on the supporting block and uniformly distributed in a radial circumference mode, the lengths of the telescopic supporting rods are the same, and the connecting rods are installed in the Helmholtz coil through acting force and reacting force when the tail end of each telescopic supporting rod is in contact with the inner side of the Helmholtz coil; a through hole for penetrating through the middle shaft lever is formed in the middle of each supporting block; a groove for placing an experimental test piece is formed in the center of the middle shaft rod, and the middle shaft rod and the Helmholtz coil are coaxially arranged.
Furthermore, telescopic branch adopts multistage formula telescopic link structure, and each section telescopic link is structural all to be equipped with the scale.
Furthermore, a through hole for the middle shaft rod and the experiment test piece to simultaneously pass through is formed in the center of the supporting block, and a shielding ring is arranged at the through hole.
Further, the length of the middle shaft rod is larger than the distance between the two connecting rods.
Furthermore, the middle shaft rod is provided with scales for ensuring that the distance from the center of the middle shaft rod to each connecting rod is equal.
Further, the clamp is made of insulating materials, including engineering plastics, magnetic insulating materials and electric insulating materials.
Furthermore, an elastic layer used for embedding the experiment test piece is arranged in the groove of the middle shaft rod.
Furthermore, the tail end of each telescopic supporting rod is provided with a hemispherical end.
Further, the hemispherical end is made of rubber.
The invention has the following characteristics and beneficial effects:
1. according to the invention, the problem of positioning a measured part when a Helmholtz coil is used is solved by matching two connecting rods with one middle shaft rod. Compare with current scheme, this scheme is fixed more accurate to the position of being surveyed in the helmholtz coil, easily realizes that the height and the direction of high accuracy are fixed. Particularly, the groove formed in the shaft rod in the clamp can be used for fixing the measured piece and compensating position errors caused by the thickness of the measured piece.
2. The clamp has the advantages of reasonable design of all parts, convenient assembly and disassembly, strong reusability and adjustable size, and one set of clamp can be suitable for a plurality of Helmholtz coils with different sizes.
3. The clamp uses the semicircular rubber end at the end part of the connecting rod, realizes the effects of increasing friction and reducing scratch, has wind resistance, and is suitable for various environments such as outdoor environment and the like; and insulating materials are adopted, so that the anti-interference performance is high, and the clamp cannot generate interference on the magnetic field distribution of the tested piece and the Helmholtz coil.
Drawings
Fig. 1 is a schematic three-dimensional structure diagram of a fixing clamp for a test object for a helmholtz coil test according to an embodiment of the present invention.
Fig. 2 is a front view of the clamp of fig. 1.
FIG. 3 is a schematic view of the fixture of FIG. 1 mounted within a Helmholtz coil.
Detailed Description
The technical scheme of the invention is described in detail below by combining the drawings and specific embodiments as follows:
the invention provides a tested part fixing clamp for a Helmholtz coil test, which consists of a middle shaft lever and two connecting rods sleeved on the middle shaft lever, wherein the positions of the two connecting rods on the middle shaft lever are adjustable; each connecting rod consists of a supporting block and 3-4 telescopic supporting rods which are fixed on the supporting block and uniformly distributed in a radial circumference mode, the lengths of the telescopic supporting rods are the same, and the connecting rods are installed in the Helmholtz coil through acting force and reacting force when the tail end of each telescopic supporting rod is in contact with the inner side of the Helmholtz coil; the middle part of each supporting block is provided with a through hole for penetrating through the middle shaft lever; a groove for placing a tested piece is formed in the center of the middle shaft rod, and the middle shaft rod and the Helmholtz coil are coaxially arranged.
The following is inventive example 1:
referring to fig. 1, the fixing clamp for the test of the helmholtz coil in this embodiment is composed of a slotted middle shaft rod 2 and two cross connecting rods 1. Wherein four branch lengths of two cross connecting rods 1 all equal, two connecting rods 1 are fixed respectively in two coils of Helmholtz coil to shaft lever 2 is located the axis of two coils in the Helmholtz coil in this assurance, and the axis and the coil axial coincidence of well shaft lever. Therefore, the center of the middle shaft rod 2 can be ensured to be positioned in the area with the best uniform magnetic field intensity of the Helmholtz coil, and the tested piece used in the experiment is placed in the groove of the middle shaft rod 2, so that the fixed work of the tested piece is completed.
The cross connecting rod 1 adopted by the clamp of the embodiment determines the circle center of a single Helmholtz coil in a four-pole-equal mode, and then determines the axis positions of two coils of the Helmholtz coil through two cross connecting rods. The positioning function of the shimming region of the Helmholtz coil is realized. The principle is simple, and the thinking is novel, and the location is accurate, and the practicality is strong.
The front view of the cross connecting rod 1 of the clamp of the embodiment is shown in fig. 2, wherein four cross supporting rods all adopt a three-section type telescopic rod structure 11, matched internal and external threads are adopted between two adjacent sections of telescopic rod structures to screw in and screw out, the length of the supporting rods can be freely adjusted, and the cross connecting rod is used by matching with Helmholtz coils with different diameters. Scales are marked on the four supporting rods and can be used for adjusting to ensure that the lengths of the four supporting rods are equal. For cooperation cross branch, the supporting shoe at the middle part of this embodiment also adopts cross block structure, and the through-hole that this cross block structure middle part was seted up is located helmholtz coil centre of a circle position.
Referring to fig. 2, the ends of the four struts of the cross-shaped connecting rod are each provided with a hemispherical end 12. This hemisphere end can be better with the arc internal surface laminating of helmholtz coil, makes the installation compacter. The hemispherical end 12 is made of rubber materials, so that the function of increasing friction force is achieved, the cross connecting rod 1 is not easy to fall off from the Helmholtz coil, the function of insulation is achieved, and temporary protection is achieved when the Helmholtz coil has an electric leakage fault; in addition, rubber contact can also protect Helmholtz coil in many tests, not scratched the damage when dismouting anchor clamps are repeated.
Referring to fig. 2, a circular through hole is formed in the middle of the cross-shaped connecting rod 1 and is used for being connected with a semicircular middle shaft rod 2. The advantage of doing so is that the wiring of being surveyed a piece electromagnetic test can be drawn forth from this through-hole, has avoided at helmholtz coil internal circuit wiring too complicated, produces too big electromagnetic interference. Meanwhile, a shielding ring can be additionally arranged at the round through hole, so that the electromagnetic interference generated by the lead wire is further shielded, and the quality of a magnetic field generated in the Helmholtz coil is improved.
Further, the length of the middle shaft rod 2 is long, and the middle shaft rod can penetrate through the two cross-shaped connecting rods 1, so that the size of the clamp can be adjusted according to Helmholtz coils with different sizes. The middle shaft lever 2 is marked with scales, the scale at the center is 0, and the scales extend to two sides. The scales of the two cross-shaped connecting rods 1 on the middle shaft rod 2 are adjusted to be equal to each other so as to ensure that the central scale 0 on the middle shaft rod 2 is always positioned in the middle of the Helmholtz coil. Simultaneously, set up the recess on well axostylus axostyle 2, the fluxgate probe of making things convenient for the experiment usefulness is installed by the measuring piece, has also compensatied the position error that the thickness of measured piece itself brought to a certain extent, can play the effect that reduces experimental error. In addition, in order to adapt to the tested pieces with different sizes, an elastic layer for embedding the experimental test piece can be attached to the groove formed in the middle shaft rod 2.
Furthermore, the clamp disclosed by the invention is made of heat-resistant insulating plastic materials (such as engineering plastics), so that the clamp is prevented from being damaged due to Joule heat of a tested piece in an electrical experiment, and the magnetic field distribution in the Helmholtz coil is prevented from being influenced due to the magnetization characteristic of the clamp. Meanwhile, although the plastic material is easy to break and damage due to low elasticity and high plasticity, the position of the measured piece cannot move due to deformation caused by load bearing and the like after the plastic material is installed, and the plastic material is favorable for better positioning the measured piece. In addition, the clamp of the present invention may alternatively be made of a magnetically insulating material (e.g., ceramic) and an electrically insulating material.
Referring to fig. 3, a schematic diagram of the embodiment is used in conjunction with a helmholtz coil used for an experiment of the output characteristics of a fluxgate probe, in which two coils 3 of the helmholtz coil are connected through a base 4. The clamp of the present invention is schematically fixed in the coil as shown in the drawing, and the test piece 5 is fixed in a groove at the center of the middle shaft 2.
In another embodiment, the connecting rod 2 is composed of a circular supporting block and 3 telescopic supporting rods uniformly distributed on the supporting block in a radial shape, and the rest is the same as that of embodiment 1, and the description is omitted here.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A tested part fixing clamp for a Helmholtz coil test is characterized by comprising a middle shaft rod and two connecting rods sleeved on the middle shaft rod, wherein the positions of the two connecting rods on the middle shaft rod are adjustable; each connecting rod consists of a supporting block and 3-4 telescopic supporting rods which are fixed on the supporting block and uniformly distributed in a radial circumference mode, the lengths of the telescopic supporting rods are the same, and the connecting rods are installed in the Helmholtz coil through acting force and reacting force when the tail end of each telescopic supporting rod is in contact with the inner side of the Helmholtz coil; a through hole for penetrating through the middle shaft lever is formed in the middle of each supporting block; a groove for placing an experimental test piece is formed in the center of the middle shaft rod, and the middle shaft rod and the Helmholtz coil are coaxially arranged.
2. The fixture of claim 1, wherein the telescopic rod is a multi-segment telescopic rod, and each segment of the telescopic rod has a scale.
3. The fixture of claim 1, wherein a through hole is formed in the center of the support block for allowing the middle shaft and the test object to pass through simultaneously, and a shielding ring is disposed at the through hole.
4. The fixture for fixing a test object for a helmholtz coil test according to claim 1, wherein the length of the central shaft is greater than the distance between two of the connecting rods.
5. The fixture for fixing a test object to be tested for a helmholtz coil test according to claim 1, wherein the middle shaft rod is provided with scales for ensuring that the distances from the center of the middle shaft rod to the connecting rods are equal.
6. The fixture of claim 1, wherein the fixture is made of an insulating material, including engineering plastics, magnetic insulating materials, and electrical insulating materials.
7. The fixture of claim 1, wherein an elastic layer is disposed in the recess of the middle shaft for embedding the test piece.
8. The fixture for fixing a test object for a Helmholtz coil test as claimed in any one of claims 1 to 7, wherein a hemispherical end is installed at a terminal of each of said telescopic struts.
9. The fixture for fixing a test object for a helmholtz coil test according to claim 8, wherein the hemispherical end is made of rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811465946.XA CN109596863B (en) | 2018-12-03 | 2018-12-03 | Tested part fixing clamp for Helmholtz coil test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811465946.XA CN109596863B (en) | 2018-12-03 | 2018-12-03 | Tested part fixing clamp for Helmholtz coil test |
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| Publication Number | Publication Date |
|---|---|
| CN109596863A CN109596863A (en) | 2019-04-09 |
| CN109596863B true CN109596863B (en) | 2020-11-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811465946.XA Active CN109596863B (en) | 2018-12-03 | 2018-12-03 | Tested part fixing clamp for Helmholtz coil test |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110082668B (en) * | 2019-05-23 | 2024-01-30 | 南京师范大学泰州学院 | Element fixing device for Helmholtz coil magnetic field test |
| CN111487523B (en) * | 2020-04-29 | 2021-04-06 | 江苏七维测试技术有限公司 | Hall sensor testing method for carrying IC tester |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070096857A1 (en) * | 2005-10-31 | 2007-05-03 | Honeywell International Inc. | Helmholtz coil system |
| CN103048551B (en) * | 2011-10-17 | 2014-12-10 | 中国科学院空间科学与应用研究中心 | Center regulating rotary table for Helmholtz coil |
| CN204679618U (en) * | 2015-06-05 | 2015-09-30 | 中国地震局地球物理研究所 | A kind of three-dimensional orthogonal coil device of field homogeneity distribution |
| CN205264434U (en) * | 2015-12-24 | 2016-05-25 | 钢铁研究总院 | Three -dimensional helmholtz coil frame of modified |
| CN205539415U (en) * | 2016-03-11 | 2016-08-31 | 宁波市计量测试研究院（宁波市衡器管理所） | Magnetic declination measurement device |
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| CN109596863A (en) | 2019-04-09 |
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