CN102706498A - Disconnected electrical contact fusion welding force detection device and method - Google Patents
Disconnected electrical contact fusion welding force detection device and method Download PDFInfo
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- CN102706498A CN102706498A CN2012101507940A CN201210150794A CN102706498A CN 102706498 A CN102706498 A CN 102706498A CN 2012101507940 A CN2012101507940 A CN 2012101507940A CN 201210150794 A CN201210150794 A CN 201210150794A CN 102706498 A CN102706498 A CN 102706498A
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Abstract
The invention provides a disconnected electrical contact fusion welding force detection device, which is used for measuring the welding force of contact points and contacts used in relays, contactors, switches, and the like. The disconnected electrical contact fusion welding force detection device comprises a welding force measuring device and a force application mechanism (a vibration exciter, a linear motor and an air cylinder), and a fixture, wherein the welding force measuring device comprises a mechanical sensor, a reed, a support base, and a shell and can be mechanically set to zero. The disconnected electrical contact welding force detection device can accomplish the measurement on the welding force (including static welding and movable welding) of the contact points and the contacts by combining a data acquisition device and a rear instrument.
Description
Technical field
The present invention relates to metallic conductor and electrically contact the field, particularly relate to and electrically contact melting welding force measurement apparatus and method.
Background technology
Between metallic conductor through Mechanical Contact, thereby the state that electric current is passed through is called and electrically contacts.Electrically contact several kinds of forms such as being divided into sliding contact, disjunction contact, slip disjunction contact, fixing contact.Wherein disjunction contact use is the most extensive, and common switch, relay, contactor, trigger etc. all belong to this scope, and material property has determined its connecting-disconnecting function and contact reliability ability basically.In the disjunction contact; Two contact point materials generally adopt elemental metals, alloy or its compound substance of silver, copper, gold, platinum etc.; The task of burden connection, disconnecting circuit and load; In (be also referred to as contact, rivet, conducting strip etc., following unification is called the contact) closed and disconnected process melting welding can take place in two contacts.Melting welding divides two kinds of situation: the electric arc that produces when contact closure or closed spring makes the fusing of two contact surface parts, and closed back contact melted portion is solidified, and contact is welded together, and is called as moving melting welding; After another kind of melting welding occurs in the closing of contact; The contact electric current transmitted produces high-density current through the contraction-like contact region that disperses, thereby in tiny area, produces great amount of heat, elevates the temperature; Temperature rise surpasses certain value will make the final welding of these microcells together, and we are referred to as the deadmelt weldering.After melting welding takes place, if Joint Strength less than disjunction power, then the contact can also separate, and receives the effect of melting welding power, disjunction action in contact has certain time-delay; Make contact can not break off the dead weldering of just generation if melting welding power surpasses disjunction power, cause the disjunction electric contact-system to lose efficacy, we are referred to as incomplete melting welding.Need the extra power that applies in the breaking course because melting welding makes, be judged to be inefficacy greater than setting value (like the maximum pull of reed).The relative motion situation is divided into moving contact and stationary contact when moving according to contact.
Material, contact pressure, shape, surface film situation and the voltage and current of melting welding and contact, circuit load situation (resistive, capacitive, perception, lamp property etc.) are all relevant.In application, mainly be to form devices such as relay, contactor, vacuum switch on the parts such as reed and under certain test conditions, make an experiment at present through the contact is installed to the judgement of melting welding; When taking place between the contact, melting welding effectively thinks generation melting welding during disjunction; Adopt tautness meter to hang on the movable contact of device this moment, and the power value that the application of force separately records until two melting welding contacts is a melting welding power.Measure melting welding power during dead weldering of the final generation of employing and can omit generation melting welding but the situation of disjunction, and this situation still can cause fault in some key application.In the time need influencing key element and investigate or study, adopt the method for tautness meter just obviously can not meet the demands to each of melting welding.
The detection of melting welding power at present has several method; The most simply be recited abovely after melting welding takes place in the contact, to utilize the extension spring taseometer that moving contact is drawn back; The taseometer maximal value is melting welding power, and the method can not detect deadmelt weldering and not exclusively melting welding, and can not do real-time detection.Also having a kind of method is through piezoelectric chip is installed in the stationary contact lower end; Through the charge amplifier amplifying signal; Through PV holding circuit indication melting welding power size, but because the transformational relation of piezoelectric substrate is a nonlinear relationship, measuring accuracy is influenced and cost is higher.In addition, through installing weight beam additional, when spring is broken contact weldering bridge at the moving contact end; Dynamometer obtains the value of melting welding power; Because the spring that increases is prone to rock, and causes moving contact and stationary contact contraposition inaccurate, also there is nonlinear problem to a certain extent in spring.No matter take which kind of detection method in the melting welding testing process, all to have precision (actual response melting welding power situation), stability (in several ten thousand disjunctions action, being consistent), sensitivity requirements such as (can detect small melting welding power), these more parameters height are good more.
Summary of the invention
It is as shown in Figure 1 that disjunction formula of the present invention electrically contacts the melting welding force test device, mainly is made up of mounting base, pressure transducer, chip strain reed, outside support, contact anchor clamps.Chip strain reed fixation power is in vertical direction, and the contact is installed in the anchor clamps, and outside support can move up and down adjusting.The contact anchor clamps run through chip strain reed and link to each other with pressure transducer, and chip strain reed connecting terminal anchor clamps and outside support, outside support can move up and down the adjusting pressure transducer and export zero point; Said force application mechanism is furnished with vibrator, cylinder or linear electric machine, and is fixed with anchor clamps at the force application apparatus end, and the experiment contact is fixed on the anchor clamps.
Under the situation of vertically placing, when moving contact is not closed, finely tune outside support, through the reed effect, offset the pressure that the deadweight of anchor clamps and contact produces, make that mechanics sensor output signal is zero.Then there is mechanical balance, detects the size of holding power with the rigidly connected mechanics sensor of lower contact at the disjunction clossing pressure that force application mechanism applies the zero hour and the holding power of lower contact.Force application mechanism progressively reduces clossing pressure until being zero after disjunction begins, if there is not the existence of melting welding power, no longer changes after then holding power is reduced to zero, and is as shown in Figure 3.If there is melting welding power, then force application mechanism need apply an extra power that makes progress and draw back the contact that bonds together, and power that a negative sense change can occur on the mechanics sensor this moment, drawn back up to the melting welding part, and holding power just can be got back to zero point, and is as shown in Figure 4.
Like the force application mechanism of the melting welding force test device adapted of Fig. 3, force application mechanism can be vibrator, cylinder or linear electric machine, and its underpart is fixed with anchor clamps, and the contact is fixed on the anchor clamps, and lead is connected on the anchor clamps, can after the energising.Force application mechanism and proving installation can on put, underlying or place with other direction.The signal wire that pressure transducer is drawn connects the rear end and amplifies instrument, and the rear end uses peak holding circuit or computer data acquiring device can obtain maximum melting welding power value.Said force application mechanism adopts vibrator, cylinder or linear motor driving, under control, applies continuously or reduces closed contact pressure, and its underpart is fixed with anchor clamps, and the contact is fixed on the anchor clamps, and lead is connected on the anchor clamps, switch on during measurement,
The present invention proposes a kind of brand-new disjunction formula and electrically contact the melting welding force test device; Possess high precision, high stability, high sensitivity characteristics; Proving installation is axially being measured melting welding power, and with axial vertical X, Y direction non-displacement; Can guarantee that contact contraposition in the long period of experiments process is accurate, can not introduce experimental error; Because between contact and mechanics sensor is hard the connection, not because of adding time lag that spring etc. causes and non-linear, real time reaction melting welding power situation and highly sensitive; Can return to zero to force transducer output through adjusting position, can improve the output area and raising precision of rear end amplifying circuit; The back is balance on mechanical structure because the melting welding force measuring device tilts, and does not influence the melting welding force measurement, therefore can arbitrarily angledly use.On apparatus and method of the present invention basis; Through fixing experiment conditions such as contact pressure, contact shape, voltage and current, circuit load, change the material type and pairing parameter of contact, cooperate the computer data acquiring equipment of rear end; The value of melting welding power when at every turn being opened; As shown in Figure 5, can realize fusion welding property and trend are experimentized and analyzes, thus screening and seek the slider material that meets final service condition.
Description of drawings
Fig. 1 electrically contacts melting welding force test device synoptic diagram for the disjunction formula, is melting welding force measuring device and chip strain reed example.
Fig. 2 is the application of force and measurement mechanism synoptic diagram, is the melting welding force measuring device usage example of just putting and be inverted.
Output mechanics signal schematic representation when Fig. 3 and Fig. 4 are no melting welding for the signal schematic representation of pressure transducer output: Fig. 3, Fig. 4 is output mechanics signal schematic representation when melting welding takes place.
Fig. 5 is actual melting welding power detection example, for repeatedly testing back melting welding power change curve.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done further explain.Should correct understanding be: the method in the embodiments of the invention is only used for explaining the present invention, rather than limitation of the present invention.
Embodiment one sensor adopts the 500cN force transducer, adopts vibrator as drive source, 10 Ns of the maximum application of forces of vibrator, and displacement range 8mm adopts square wave to drive dutycycle 50%.The terminal stationary fixture of vibrator central shaft, the clamping contact is as moving contact.Adopt the melting welding force test device clamping stationary contact described in summary of the invention.This device reed and support external diameter are 105mm, and support height is 90mm.Melting welding force test device force transducer output signal connects peak-holding circuit and computer data acquisition system, and resetting earlier before each disjunction connects peak-holding circuit, divides the computing machine of having no progeny to read the negative peak calculated signals through data acquisition system (DAS) and obtains melting welding power.Melting welding power measurement range :+245cN is to-245cN.
Contact samples using AgNi10-AgNi10 experimentizes disjunction total degree 20000 times from pairing.Moving contact is a planar shaped, diameter 3mm, and the thick 0.65mm of contact, foot footpath 1.5mm, foot length 0.7mm, the stationary contact specification is an arc surfaced, size is the same.Experiment electric current 220V AC 10A, resistive load through the melting welding power value of computer recording closure/disjunction each time, thereby is investigated the welding tendency of this contact.
Annotate: 1 kilogram=9.8N, 1cN=1/100 N, 1 gram force=0.98 cN.
Embodiment two sensors adopt the 2000g mechanics sensor.Adopt stroke be the cylinder of 15mm as drive source, cooperate the two-position five-way valve solenoid valve, electromagnetic valve coil voltage is 12V, feeds pressurized air.The terminal fixed contact anchor clamps of cylinder, the clamping contact is as moving contact on the anchor clamps.Adopt foregoing device to grasp the contact, as stationary contact.The relative position of regulating between cylinder and melting welding force test device obtains experiment required stroke and clossing pressure.When leading to 12V voltage to solenoid valve, cylinder stretches out, and moving contact impacts stationary contact, and is closed between the contact; Solenoid valve outage exhaust hood is regained disjunction between the contact.
Experiment material sound contact is AgSnO2/Cu compound substance contact, disjunction total degree 20000 times.Moving contact is of a size of plane, diameter 4.5mm, and the thick 0.9mm of contact, foot footpath 1.5mm, foot length 1.65mm, stationary contact are arc surfaced.
Experiment condition is: 25A 220V AC resistive load, and melting welding power measurement range :+1960cN to 1960cN, through the melting welding power value of computer recording closure/disjunction each time, thereby investigate the melting welding inefficacy rule of this contact.
Claims (7)
1. a disjunction formula electrically contacts the melting welding force test device; Contain force application mechanism and device for measuring force; Both vertically place perpendicular to horizontal direction in employing; It is characterized in that: said device for measuring force is made up of mounting base, pressure transducer, chip strain reed, outside support, contact anchor clamps, and the contact is installed in the anchor clamps of contact, and the contact anchor clamps run through chip strain reed and link to each other with pressure transducer; Chip strain reed connecting terminal anchor clamps and outside support, outside support can move up and down the adjusting pressure transducer and export zero point; Said force application mechanism is furnished with vibrator, cylinder or linear electric machine, and is fixed with anchor clamps at the force application apparatus end, and the experiment contact is fixed on the anchor clamps.
2. disjunction formula as claimed in claim 1 electrically contacts the melting welding force test device; It is characterized in that: said proving installation also is furnished with pressure transducer; The output signal connects the back end signal amplifying circuit; Obtain melting welding power through the computing machine HSDA and change waveform, image data is carried out the maximum value analysis obtain melting welding power value.
3. disjunction formula as claimed in claim 1 electrically contacts the melting welding force test device, it is characterized in that: said pressure transducer output connects the rear end and amplifies instrument, and instrument adapted peak-holding circuit obtains melting welding power value.
4. disjunction formula as claimed in claim 1 electrically contacts the melting welding force test device, it is characterized in that: but said force application mechanism and proving installation can on put also underlying or place with other direction.
5. a disjunction formula electrically contacts the melting welding force test method, it is characterized in that: contain following steps:
The experiment contact is fixed on and puts into the melting welding force measuring device of being made up of mounting base, pressure transducer, chip strain reed, outside support, contact anchor clamps in the anchor clamps of contact,
The contact anchor clamps run through chip strain reed and link to each other with pressure transducer, and chip strain reed connecting terminal anchor clamps and outside support, outside support can move up and down the adjusting pressure transducer and export zero point,
Force application apparatus is furnished with vibrator, cylinder or linear electric machine; And being fixed with anchor clamps at the force application apparatus end, the experiment contact is fixed on the anchor clamps, switches on during measurement; The control force application apparatus forms closure, breakdown action; Signal is exported to the back termination and is amplified the pressure transducer of instrument, and instrument adapted peak-holding circuit obtains melting welding power value, writes down and read the value of melting welding power.
6. disjunction formula as claimed in claim 5 electrically contacts the melting welding force test method, it is characterized in that: said contact is installed in the anchor clamps, when moving contact is not closed; Finely tune outside support; Through the reed effect, offset the anchor clamps pressure that deadweight produces with point, make that mechanics sensor output signal is zero; Then there is mechanical balance, detects the size of holding power with the rigidly connected mechanics sensor of lower contact at the disjunction clossing pressure that force application mechanism applies the zero hour and the holding power of lower contact;
Force application mechanism progressively reduces clossing pressure until being zero after disjunction begins; If there is not the existence of melting welding power, no longer change after then holding power is reduced to zero, if there is melting welding power; Then force application mechanism need apply an extra power that makes progress and draw back the contact that bonds together; Power that a negative sense change can occur on the mechanics sensor this moment, drawn back up to the melting welding part, and holding power just can be got back to zero point.
7. disjunction formula as claimed in claim 5 electrically contacts the melting welding force test method, it is characterized in that: but said force application mechanism and proving installation can on put also underlying or place with other direction.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308387A (en) * | 2013-05-30 | 2013-09-18 | 福达合金材料股份有限公司 | Static fusion welding force test device and method of electric contact material |
| CN105158520A (en) * | 2015-08-07 | 2015-12-16 | 湖南红太阳新能源科技有限公司 | Contactor used for testing |
| CN105976688A (en) * | 2016-05-04 | 2016-09-28 | 华中科技大学 | Electromagnetic relay contact dynamic fusion welding feature simulation experiment device with adjustable parameters |
| CN105973151A (en) * | 2016-05-04 | 2016-09-28 | 华中科技大学 | Breaking-type electric contact gap measuring device |
| CN106443235A (en) * | 2016-08-28 | 2017-02-22 | 福达合金材料股份有限公司 | Electrical contact material electric contact performance simulation test apparatus and test method |
| CN110274827A (en) * | 2019-07-18 | 2019-09-24 | 哈尔滨工业大学 | A kind of pilot system and method suitable for the test of contact melted power |
| CN115526540A (en) * | 2022-10-28 | 2022-12-27 | 苏州西门子电器有限公司 | Method and device for evaluating electric life, computer readable medium and electronic equipment |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202648850U (en) * | 2012-05-16 | 2013-01-02 | 昆明贵研金峰科技有限公司 | Breaking type electric contact welding force testing device |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202648850U (en) * | 2012-05-16 | 2013-01-02 | 昆明贵研金峰科技有限公司 | Breaking type electric contact welding force testing device |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308387A (en) * | 2013-05-30 | 2013-09-18 | 福达合金材料股份有限公司 | Static fusion welding force test device and method of electric contact material |
| WO2014190784A1 (en) * | 2013-05-30 | 2014-12-04 | 福达合金材料股份有限公司 | Device for testing static fusion welding force of electrical contact material and test method therefor |
| CN105158520A (en) * | 2015-08-07 | 2015-12-16 | 湖南红太阳新能源科技有限公司 | Contactor used for testing |
| CN105158520B (en) * | 2015-08-07 | 2018-05-29 | 湖南红太阳新能源科技有限公司 | A kind of test contactor |
| CN105976688A (en) * | 2016-05-04 | 2016-09-28 | 华中科技大学 | Electromagnetic relay contact dynamic fusion welding feature simulation experiment device with adjustable parameters |
| CN105973151A (en) * | 2016-05-04 | 2016-09-28 | 华中科技大学 | Breaking-type electric contact gap measuring device |
| CN105976688B (en) * | 2016-05-04 | 2018-11-13 | 华中科技大学 | A kind of dynamic fusion welding property analogue experiment installation in the electromagnetic relay contact of adjustable parameter |
| CN106443235A (en) * | 2016-08-28 | 2017-02-22 | 福达合金材料股份有限公司 | Electrical contact material electric contact performance simulation test apparatus and test method |
| CN106443235B (en) * | 2016-08-28 | 2023-09-05 | 浙江福达合金材料科技有限公司 | Electrical contact material electrical contact performance simulation test device and test method |
| CN110274827A (en) * | 2019-07-18 | 2019-09-24 | 哈尔滨工业大学 | A kind of pilot system and method suitable for the test of contact melted power |
| CN115526540A (en) * | 2022-10-28 | 2022-12-27 | 苏州西门子电器有限公司 | Method and device for evaluating electric life, computer readable medium and electronic equipment |
| CN115526540B (en) * | 2022-10-28 | 2024-02-23 | 苏州西门子电器有限公司 | Method and device for evaluating electric life, computer readable medium and electronic equipment |
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