CN102749596B - Magnetic steel performance consistency screening device for space travelling wave tube - Google Patents
Magnetic steel performance consistency screening device for space travelling wave tube Download PDFInfo
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- CN102749596B CN102749596B CN201110101385.7A CN201110101385A CN102749596B CN 102749596 B CN102749596 B CN 102749596B CN 201110101385 A CN201110101385 A CN 201110101385A CN 102749596 B CN102749596 B CN 102749596B
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Abstract
The invention discloses a magnetic steel performance consistency screening device for a space travelling wave tube, relating to an electric vacuum device. A support platform is arranged in a constant-temperature box, a clamp for fixing magnetic steel to be tested is arranged on the support platform, one side of the clamp is provided with a clamping block, and a temperature measuring thermocouple is suspended just above the clamp; a spacer is arranged between the clamping block and the clamp; the clamping block is connected with a tension sensor outside the constant-temperature box through a pulling wire; the tension sensor is fixedly arranged on the upper surface of a moving trolley and moves synchronously with the trolley; and the tension sensor, a trolley driving device, the temperature measuring thermocouple and a temperature adjusting system of the constant-temperature box are respectively and electrically connected with a computer. Changes of the performance of the magnetic steel along with the temperature are measured indirectly via measuring magnetic forces of magnetic steel to be tested to soft magnetic alloy materials within the testing temperature range, and thus the screening of consistency of the magnetic steel for the space travelling wave tube is realized. The device has high sensitivity in measurement of changes of the performance of the magnetic steel along with the temperature and a wide range of high/low testing temperature, automated measurement can be realized, and the device can be operated conveniently.
Description
Technical field
The present invention relates to electron tube technical field, particularly space travelling wave tube magnet steel performance and vary with temperature conforming screening plant.
Background technology
Space travelling wave tube is the core component that is widely used in the final power amplifier of transponder, data transmission system, radar and the ECM transmitter etc. of telstar, reconnaissance satellite, Navsat, landsat, weather satellite, seasat and manned space flight and lunar exploration engineering.
Generally be greater than 10 years the serviceable life of space travelling wave tube, and the reliability requirement of work is very high.One of high reliability performance of space travelling wave tube work is exactly in the high Low Temperature Thermal cyclic process of experience (temperature range is generally between-30 ℃ to+80 ℃), can both keep normal steady operation.
As shown in Figure 1, travelling-wave tube comprises several major parts such as magnet steel e, electron gun f of input structure a, export structure b, collector c, helix part d, magnetic circuit part.The magnetic circuit of magnet steel composition is the important component part of travelling-wave tube, and it directly has influence on frequency of operation, power, efficiency, noise figure, stability and the life-span of travelling-wave tube.
Travelling-wave tube magnetic circuit is generally made up of tens to tens blocks magnet steel, and these magnet steel are along with the variation of travelling-wave tube environment for use temperature, and magnetic property is corresponding to change, and this is the essential attribute of magnet steel.Concerning same travelling-wave tube, the magnetic circuit magnet steel of selection will meet: on the one hand, magnet steel performance variation with temperature is as far as possible little, the temperature coefficient < 0.03% of General Requirements magnet steel; On the other hand, the performance variation with temperature of tens blocks of magnet steel of composition magnetic circuit will be consistent, and can not occur the situation of indivedual magnet steel performances with temperature acute variation, and this impact of steady operation on travelling-wave tube is very large.Concerning the travelling-wave tube of same model, the magnet steel performance of composition magnetic circuit also will be consistent as far as possible, is conducive to like this produce stable performance, consistent good space travelling wave tube.
The magnet steel that space travelling wave tube uses as shown in Figure 2, generally comprises two kinds of annular magnet steel (a) and cuboid magnet steel (b).Magnet steel performance variation with temperature generally characterizes with the temperature coefficient of magnet steel.Order when magnet steel, what producer generally provided is to take a sample test data, and the sample of test is all in most cases special shape, can not reflect and orders the temperature variant individual difference of magnet steel.And with regard to the production status of current domestic magnet steel, inevitably there is performance difference in the magnet steel performance between same batch, different batches, therefore carries out the temperature variant consistance screening of space travelling wave tube magnet steel performance and seem particularly important.
Evaluation (reference: [1] GB/T 8986-1999 permanent magnetic material temperature coefficient measuring method to magnetic material; [2] GB/T 3217-1992 permanent magnetism (Hard Magnetic) magnetism of material test method; [3] Li Xing, Zhang Fumin, a drizzle.The discussion that permanent magnetic material temperature coefficient is measured.Electrical alloy collected works, 1989,1:24-26), the magnetic property of normally measuring sample (the same batch of standard sample of manufacturing or the direct sample cutting from product in magnetic materials production process) in closed magnetic circuit, conventional device has direct current impulse type magnet equipment, DC magnetic self-operated measuring unit and symmetric double yoke tester etc.The measuring accuracy of these measurement mechanisms is higher, but is confined to the measurement of the standard model to certain size, shape.In the daily production of travelling-wave tube, be generally to adopt the gaussmeter that hall probe is installed to measure (reference: " microwave tube magnetic Circuit Design handbook " National Defense Industry Press, 1984 are compiled by tube design handbook editorial board) at present.Change because the performance of Hall plate in hall probe varies with temperature, therefore generally can not be used for measuring magnet steel performance variation with temperature, otherwise measuring error is very large.
The people's such as Li Shi patent of invention has proposed the (reference: Lee is real of a kind of instrument for measuring magnetic field in high temperature, Wu Linlin " applied instrument for measuring magnetic field in high temperature " Chinese invention patent, number of patent application 200410098989.0) its core is to use cooling hall probe to measure the magnetic field intensity of magnet steel.Because hall probe and magnet steel are in same heating zone, the hall probe ambient temperature being cooled constantly changes and the coolant temperature of input is also difficult to keep invariable, causes the temperature of hall probe to be difficult to keep constant.The performance of Hall plate varies with temperature and changes, in this case, the magnet steel performance of measuring is unavoidably brought the uncertainty of measuring magnet steel performance along with the uncertainty of environment temperature, therefore this measuring instrument is difficult to competent magnet steel performance and varies with temperature conforming matching measurement.
Summary of the invention
The object of the invention is open a kind of space travelling wave tube magnet steel consistency of performance screening plant, the problem existing for prior art, solve the temperature variant consistance screening of travelling-wave tube magnetic circuit magnet steel performance problem, and and then the space travelling wave tube highly reliable to producing, stable performance is consistent technical guarantee is provided.
For achieving the above object, technical solution of the present invention is:
Magnet steel consistency of performance screening plant for a kind of space travelling wave tube, it comprises pulling force sensor, dolly, bracing wire, rank piece, support platform, magnet steel stationary fixture to be measured, magnet steel to be measured, sept, temperature thermocouple, constant temperature oven, computing machine; Wherein,
In constant temperature oven, be horizontally disposed with support platform, support platform is provided with magnet steel stationary fixture to be measured, and a side of stationary fixture is provided with rank piece, the unsettled temperature thermocouple that arranges directly over stationary fixture;
Between rank piece and stationary fixture, be provided with sept; Rank piece is connected with the pulling force sensor in constant temperature oven outside by bracing wire;
Pulling force sensor is fixedly arranged in travelling car upper surface, with dolly synchronizing moving;
The thermoregulating system of the drive unit of pulling force sensor, dolly, temperature thermocouple, constant temperature oven is electrically connected with computing machine respectively;
When measurement, magnet steel to be measured is fixedly arranged in stationary fixture, in Range of measuring temp, by measuring magnet steel to be measured, the magnetic field force of rank piece is measured to magnet steel performance variation with temperature to be measured indirectly, and then complete the temperature variant consistance screening of magnet steel performance to be measured.
Magnet steel consistency of performance screening plant for described space travelling wave tube, described in it, bracing wire is horizontally disposed with, and connects the sidewall of constant temperature oven.
Magnet steel consistency of performance screening plant for described space travelling wave tube, support platform, stationary fixture described in it, use non-magnetic material to make, for aluminium alloy, magnetism-free stainless steel one of them; Rank piece, uses magnetically soft alloy to make, for pure iron, mild carbon steel, silicon steel one of them; Sept, uses nonmagnetic substance to make, for alumina ceramics, aluminium alloy, oxygen-free copper, magnetism-free stainless steel one of them.
Magnet steel consistency of performance screening plant for described space travelling wave tube, it regulates pulling force f to be no more than the measurement range of pulling force sensor by changing width of sept, to expand the adaptability of screening plant to magnet steel magnetic property to be measured.
Magnet steel consistency of performance screening plant for described space travelling wave tube, its Range of measuring temp is wide, adopts compressor cooling, liquid nitrogen refrigerating technology, and low temperature is below-80 ℃, and by Resistant heating mode, high temperature reaches+and more than 200 ℃.
Magnet steel consistency of performance screening plant for described space travelling wave tube, the measuring process of the magnetic field force F of its magnet steel to be measured to rank piece is as follows: computing machine is by the temperature of the tested magnet steel of thermocouple measurement, computer control constant temperature oven is after a certain temperature T insulation certain hour, computer control travelling car draws rank piece by bracing wire, record pulling force-displacement f-x curve by pulling force sensor, computing machine is analyzed pulling force-displacement f-x curve, obtain the maximum pull fmax at this temperature, repeat above process, to obtain maximum pull-temperature fmax-T curve.
Magnet steel consistency of performance screening plant for space travelling wave tube of the present invention, has following characteristics: 1, measure magnet steel performance temperature variant highly sensitive; 2, high low temperature Range of measuring temp is wide; 3, can realize automatic measurement, easy to operate.
Accompanying drawing explanation
Fig. 1 is travelling-wave tube one-piece construction schematic diagram; In figure: a is travelling-wave tube input structure; B is travelling-wave tube export structure; C is traveling-wave tube collector; D is travelling tube helical line part; E is the magnet steel of magnetic circuit part; F is travelling-wave tube electron gun.
Fig. 2 is travelling-wave tube magnet steel schematic diagram; Wherein:
Fig. 2 (a) is annular magnet steel;
Fig. 2 (b) is cuboid magnet steel;
Fig. 3 is a kind of space travelling wave tube magnet steel consistency of performance screening plant structural representation of the present invention; In figure: 1 is pulling force sensor; 2 is travelling car; 3 is bracing wire; 4 is magnetically soft alloy rank piece; 5 is support platform; 6 is magnet steel stationary fixture to be measured; 7 is magnet steel to be measured; 8 is nonmagnetic substance sept; 9 is temperature thermocouple; 10 is constant temperature oven; 11 is computing machine;
Fig. 4 is the pulling force-displacement f-x curve synoptic diagram between tested magnet steel and rank piece;
Fig. 5 is the maximum pull-temperature fmax-T curve synoptic diagram between tested magnet steel and rank piece.
Embodiment
Figure 3 shows that a kind of space travelling wave tube magnet steel consistency of performance screening plant schematic diagram of the present invention, comprise the ingredients such as pulling force sensor 1, travelling car 2, bracing wire 3, magnetically soft alloy rank piece 4, support platform 5, magnet steel stationary fixture 6 to be measured, magnet steel to be measured 7, nonmagnetic substance sept 8, temperature thermocouple 9, constant temperature oven 10, computing machine 11.
Wherein, be horizontally disposed with support platform 5 in constant temperature oven 10, support platform 5 is provided with magnet steel stationary fixture 6 to be measured, and a side of stationary fixture 6 is provided with rank piece 4, the unsettled temperature thermocouple 9 that arranges directly over stationary fixture 6;
Between rank piece 4 and stationary fixture 6, be provided with sept 8; Rank piece 4 is connected with the pulling force sensor 1 in constant temperature oven 10 outsides by bracing wire 3;
Pulling force sensor 1 is fixedly arranged in travelling car 2 upper surfaces, with dolly 2 synchronizing movings;
The thermoregulating system of the drive unit of pulling force sensor 1, dolly 2, temperature thermocouple 9, constant temperature oven 10 is electrically connected with computing machine 11 respectively;
When measurement, magnet steel 7 to be measured is fixedly arranged in stationary fixture 6, in Range of measuring temp, by measuring magnet steel 7 to be measured, the magnetic field force of magnetically soft alloy rank piece 4 is measured to magnet steel 7 performance variation with temperature to be measured indirectly, and then complete the temperature variant consistance screening of magnet steel 7 performance to be measured.
Pulling force sensor 1 is contained on a travelling car 2 driven by stepper motors.
Temperature in constant temperature oven 8 can change continuously from low temperature to high temperature, and variation range can specifically customize according to test request.
Wherein, μ
rfor the relative permeability of rank piece, μ
0for permeability of vacuum, B is magnetic induction density, and s is magnetic field and the area of holding in the mouth piece acting surface.
From formula (1), we know, the magnetic field intensity B that magnetic attraction F and magnet steel produce
2have incidence relation, the variation that magnetic field intensity B the is little larger variation of F of can exerting oneself replaces, and therefore measures magnetic attraction F variation with temperature and more can reflect delicately magnet steel magnetic field intensity B variation with temperature.
The automatic measurement process of magnetic attraction F is as follows: computing machine 11 is measured the temperature of tested magnet steel 7 by thermopair 9, computing machine 11 is controlled constant temperature oven 10 after a certain temperature T insulation certain hour, computing machine 11 is controlled travelling car 2 by bracing wire 3 traction rank pieces 4, records pulling force-displacement f-x curve as shown in Figure 4 by pulling force sensor 1.Computing machine 11 is analyzed the pulling force-displacement f-x curve shown in Fig. 4, obtains the maximum pull fmax at this temperature.Repeat above process, just can obtain maximum pull-temperature fmax-T curve as shown in Figure 5.By comparing the fmax-T curve of different magnet steel, complete the conforming screening of magnet steel temperature performance.
As shown in Figure 3, support platform 5 and magnet steel stationary fixture 6 to be measured use non-magnetic material to make, such as aluminium alloy, magnetism-free stainless steel etc.
As shown in Figure 3, rank piece 4 uses magnetically soft alloy to make, such as pure iron, mild carbon steel, silicon steel etc.Sept 8 is made up of nonmagnetic substance, such as alumina ceramics, aluminium alloy, oxygen-free copper, magnetism-free stainless steel etc.Pulling force f is the reflection of attractive force between rank piece 4 and magnet steel to be measured 7, should be to be decided by the distance between rank piece 4 and magnet steel to be measured 7, be reflected on sept 8, and be the horizontal width of sept 8, do not involve other physical dimension of sept 8.Change the width of sept 8 and regulate pulling force f to be no more than the measurement range of pulling force sensor 1, to expand the adaptability of this screening plant to tested magnet steel performance.
In order to raise the efficiency, can in a constant temperature oven 10, carry out many covers magnetic field force measurement simultaneously, between every cover measurement mechanism, need to guarantee to be separated by certain safe distance, measurement each other is not affected mutually.
Computing machine 11 is measured the temperature of tested magnet steel 7 by thermopair 9, computing machine 11 is controlled constant temperature oven 10 after a certain temperature T insulation certain hour, computing machine 11 is controlled travelling car 2 by bracing wire 3 traction rank pieces 4, records pulling force-displacement f-x curve as shown in Figure 4 by pulling force sensor.Computing machine 11 is analyzed the pulling force-displacement f-x curve shown in Fig. 4, obtains the maximum pull fmax at this temperature.Repeat above process, just can obtain maximum pull-temperature fmax-T curve as shown in Figure 5.By comparing maximum pull-temperature fmax-T curve of different magnet steel, complete magnet steel performance and vary with temperature conforming screening.
Claims (7)
1. a magnet steel consistency of performance screening plant for space travelling wave tube, it is characterized in that, comprise pulling force sensor, dolly, bracing wire, rank piece, support platform, magnet steel stationary fixture to be measured, magnet steel to be measured, sept, temperature thermocouple, constant temperature oven, computing machine; Wherein,
In constant temperature oven, be horizontally disposed with support platform, support platform is provided with magnet steel stationary fixture to be measured, and a side of stationary fixture is provided with rank piece, the unsettled temperature thermocouple that arranges directly over stationary fixture;
Between rank piece and stationary fixture, be provided with sept; Rank piece is connected with the pulling force sensor in constant temperature oven outside by bracing wire;
Pulling force sensor is fixedly arranged in travelling car upper surface, with dolly synchronizing moving;
The thermoregulating system of the drive unit of pulling force sensor, dolly, temperature thermocouple, constant temperature oven is electrically connected with computing machine respectively;
When measurement, magnet steel to be measured is fixedly arranged in stationary fixture, in Range of measuring temp, by measuring magnet steel to be measured, the magnetic field force of rank piece is measured to magnet steel performance variation with temperature to be measured indirectly, and then complete the temperature variant consistance screening of magnet steel performance to be measured.
2. magnet steel consistency of performance screening plant for space travelling wave tube as claimed in claim 1, is characterized in that, described bracing wire is horizontally disposed with, and connects the sidewall of constant temperature oven.
3. magnet steel consistency of performance screening plant for space travelling wave tube as claimed in claim 1, is characterized in that, described support platform, stationary fixture use non-magnetic material to make; Rank piece, uses magnetically soft alloy to make; Sept, uses nonmagnetic substance to make.
4. magnet steel consistency of performance screening plant for space travelling wave tube as claimed in claim 3, is characterized in that, described non-magnetic material be aluminium alloy, magnetism-free stainless steel one of them; Described magnetically soft alloy be pure iron, mild carbon steel, silicon steel one of them; Described nonmagnetic substance be alumina ceramics, aluminium alloy, oxygen-free copper, magnetism-free stainless steel one of them.
5. magnet steel consistency of performance screening plant for space travelling wave tube as claimed in claim 1, it is characterized in that, regulate pulling force f to be no more than the measurement range of pulling force sensor by changing the width of sept, to expand the adaptability of screening plant to magnet steel magnetic property to be measured.
6. magnet steel consistency of performance screening plant for space travelling wave tube as claimed in claim 1, is characterized in that, described Range of measuring temp is wide, adopt compressor cooling, liquid nitrogen refrigerating technology, low temperature is below-80 ℃, by Resistant heating mode, high temperature reaches+and more than 200 ℃.
7. magnet steel consistency of performance screening plant for space travelling wave tube as claimed in claim 1, it is characterized in that, the measuring process of the magnetic field force F of magnet steel to be measured to rank piece is as follows: computing machine is by the temperature of the tested magnet steel of thermocouple measurement, computer control constant temperature oven is after a certain temperature T insulation certain hour, computer control travelling car draws rank piece by bracing wire, record pulling force-displacement f-x curve by pulling force sensor, computing machine is analyzed pulling force-displacement f-x curve data, obtain the maximum pull fmax at this temperature, repeat above process, to obtain maximum pull-temperature fmax-T curve.
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| CN103064044B (en) * | 2013-01-03 | 2014-10-08 | 无锡隆盛科技股份有限公司 | Hall displacement sensor magnetic steel detection device |
| CN103235032B (en) * | 2013-04-16 | 2014-03-12 | 中南林业科技大学 | Pyromagetic effect multi-field coupling integration testing system |
| CN112051527B (en) * | 2020-08-11 | 2021-07-02 | 大连理工大学 | Clamping-detecting integrated device and matching method for micro magnetic steel |
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