CN103487684A - Mean time between failure (MTBF) testing machine and testing method thereof - Google Patents
Mean time between failure (MTBF) testing machine and testing method thereof Download PDFInfo
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- CN103487684A CN103487684A CN201310422270.7A CN201310422270A CN103487684A CN 103487684 A CN103487684 A CN 103487684A CN 201310422270 A CN201310422270 A CN 201310422270A CN 103487684 A CN103487684 A CN 103487684A
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Abstract
The invention relates to the technical field of electric appliance testing, in particular to a mean time between failure (MTBF) testing machine and a testing method thereof. The MTBF testing machine comprises a testing machine body and a hot air exhaust channel formed in the testing machine body, wherein a hot air exhaust device is arranged in the hot air exhaust channel, a temperature detection device used for detecting the temperature in the testing machine body in real time is disposed in the testing machine body, the lower portion of the testing machine body is provided with a fresh air inlet, a fresh air inlet control valve is arranged in the fresh air inlet, a heater, a circulating wind turbine and a circulating fan are arranged in the testing machine body, and the circulating wind turbine and the circulating fan enable air in the testing machine body to circulate and flow. The MTBF testing machine further comprises a refrigerating device and a control device. The MTBF testing machine is simple in structure, and can adjust various testing conditions, reduce energy consumption of testing and shorten testing time. Besides, heat of samples is effectively used by means of a circulating system, work performance is reliable, the use effect is good, and uniformity of temperature distribution in the testing machine is effectively guaranteed.
Description
Technical field
The present invention relates to the electric test technical field, more specifically, relate to a kind of mean free error time testing machine and test method thereof.
Background technology
MTBF, the mean time between failures claims again the mean free error time, English full name is that " Mean Time Between Failure " refers to the averaging time between twice adjacent fault of repairable item, is designated as MTBF.MTBF is the reliability index of weighing a product (especially electric equipment products).Unit be " hour ".It has reflected the temporal quality of product, is to embody a kind of ability that product keeps function at the appointed time.Specifically, but it is only applicable to maintenance product.Also prescribed product is MTBF in total operational phase accumulative total working time and the ratio of the number of stoppages simultaneously.Be provided with a recoverable product in use, occurred altogether
n 0inferior fault, come into operation with new the same the continuation again through repairing after each fault, and its working time is respectively:
, so the mean time between failures of product, namely mean lifetime is that Q is:
Usually, we can see this MTBF value on the handbook of product or packing.In the prior art, normally in the reliability burn-in chamber, carry out, burn-in chamber, cry again and burn machine room, to go out the equipment of a kind of high temperature, rugged surroundings test for the high-performance electronic product simulation, be the important experimental facilities that improves product stability, reliability, be that each manufacturing enterprise improves the quality of products and emulative important production procedure, this equipment is widely used in the fields such as power supply electronic, computer, communication, bio-pharmaceuticals.Existing burn-in chamber normally makes product be set under a certain state, then test other numerical value, for example, the input current of product and voltage are fixed, and then temperature or humidity variation are tested, and these conditions can not be become and can control, like this, the test of burn-in chamber is to separate independently, has greatly increased the energy consumption of test and the time of test, and its applicable scope is narrow.
Summary of the invention
The present invention, for overcoming described at least one defect of above-mentioned prior art, provides a kind of mean free error time testing machine and test method thereof, can be adjusted various test conditions, has reduced the energy consumption of test and the time of test.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of mean free error time testing machine, wherein, comprise the testing machine main body, be located at the thermal wind exhausting passage on the testing machine main body, be provided with the thermal wind exhausting device in the thermal wind exhausting passage, be provided with in the testing machine main body temperature in main body is carried out to the temperature-detecting device detected in real time; The testing machine lower body part is provided with new wind entrance, in new wind entrance, is provided with new wind entrance operation valve; Be provided with well heater in the testing machine main body, mobile circulation wind wheel and the circulating fan to testing machine body interior air circulation; Also comprise refrigerating plant and control device, control device is electrically connected to above-mentioned thermal wind exhausting device, temperature-detecting device, new wind entrance operation valve, well heater, circulation wind wheel, circulating fan, refrigerating plant respectively.
Control device is provided with touch display screen, can control the parameters such as temperature in Comprehensive Control testing machine main body, voltage by control device, control device is standard container controller programming interface, but design temperature and magnitude of voltage on touch display screen, when needs are done 35 degree, during the operation of 300V voltage definite value, just directly at touch display screen, set.When selecting the walking program operation, can change the page at touch display screen and be set, as the 0th section (the program initial segment is 0 section), how many hours do, how many minutes, temperature was how many, voltage is how many again, sets, and then then sets first paragraph, how many hours do, how many minutes, temperature was how many, voltage is how many again, sets, and so analogizes, can set at most 50 sections, and program operation capable of circulation, 999 times capable of circulation at most.Program can be preengage start by set date or be stopped, and according to setting value, automatically turns round, and without personnel, intervenes.
Further, described refrigerating plant comprises compressor, air-cooled condenser and the restriction device of being located at testing machine main body outside, is located at the evaporator of testing machine body interior.In this programme, the common technology that the refrigeration principle of refrigerating plant is this area, do not describe in detail at this.
Further, testing machine also comprises alternating current-direct current control power supply, with alternating current-direct current, controls a plurality of sockets that power supply is connected, and socket is distributed in the testing machine main body.The socket number of described ac control power supply is 100, and the socket number of DC control supply is 100.The testing machine body interior useful space is not less than 8(L) * 3.6(W) * 2.4(H) (m), each 100, interchange (10A), direct supply interface is provided, be evenly distributed in the side of specimen frame, so that the test of product power supply, reserved sample working signal passage.Specimen holder width 1m, divide two-layer up and down, being designed to can be from mobile taking out of in the testing machine main body, each 100 of both sides configuration alterating and direct current supply sockets are for sample in the testing machine main body, the specimen test supply voltage can be set in the chamber director demon, 6 of the test holes of the reserved Φ 50mm of testing laboratory, to do the input of sample working signal.In the testing machine main body, all distribution materials possess high temperature resistant specification.
Described testing machine main body is provided with a body, and the door body is provided with transparent glass window, the Men Tiwei thermal insulating door thermally insulated door.Heat preserving mode: heat room plate, two Kai Pingkai thermal insulating door thermally insulated door, gate-width is no less than 1.2 m, highly is not less than 2m, specimen holder can be shifted out in test room, has visual transparent windowpane.
Be provided with smoke alarm in the testing machine main body.Prevention certain reason in the process of ageing prod makes the product burning and reports to the police, and when reporting to the police, can automatically close the burn-in chamber power supply.There is power supply earth leakage protection in the testing machine main body, the load short circuits protection.
Also be provided with the RS-485 interface on described control device.Temperature variation setting able to programme, can arrange the temperature value of different sections and as the loop cycle running test, circulation that can A.T.C, and there is LCD demonstration cyclic curve, and there is man-machine interface, be convenient to download curve, have the curve record function, the maximum holding time is no less than 60 days.The variable-frequency power sources of can controlling testing machine controller realizes supply voltage setting able to programme, the magnitude of voltage of different time section can be set and, as the loop cycle running test, have the curve record function.(variable-frequency power sources provides RS232 communication protocol).
Also be provided with indoor lamp in described testing machine main body.The indoor location explosion proof illuminating lamp, improve bulb life, prevents the bulb explosion.
A kind of test method of utilizing described testing machine comprises the following steps:
S1. the sample arranged in the testing machine main body starts, heater starting, and the heat that the heat that sample produces and well heater produce, simultaneously to air heat in main body, when temperature arrives setting value, enters temperature constant state; If design temperature is greater than 15 degree than ambient temperature, enter step S2; If the thermal value of sample is not enough to maintain design temperature in the testing machine main body, enter step S3; If in the testing machine main body, actual temperature is greater than design temperature, enter step S4;
S2. start thermal wind exhausting device and new wind entrance operation valve, the hot blast in the testing machine main body is extracted out, the new wind of external environment condition enters the testing machine main body, utilizes low ambient temperature to carry out the heat in the balancer main body;
S3. start the thermal wind exhausting device and quit work, start well heater, the well heater evolution of heat maintains design temperature in the testing machine main body;
S4. start thermal wind exhausting device and new wind entrance operation valve, utilize low ambient temperature to carry out the heat in the balancer main body, well heater quits work.
In described step S4, if start after the thermal wind exhausting device can not balance sample thermal value, start refrigerating plant.
Compared with prior art, beneficial effect is: the present invention is simple in structure, can be adjusted various test conditions, has reduced the energy consumption of test and the time of test; And its circulation system effectively utilizes the thermal value of sample, reliable working performance and result of use are good, the homogeneity that effectively the warranty test built-in temperature distributes.
The accompanying drawing explanation
Fig. 1 is one-piece construction schematic top plan view of the present invention.
Fig. 2 is that one-piece construction master of the present invention looks schematic diagram.
Fig. 3 is one-piece construction schematic side view of the present invention.
Embodiment
Accompanying drawing, only for exemplary illustration, can not be interpreted as the restriction to this patent; For better explanation the present embodiment, some parts of accompanying drawing have omission, zoom in or out, and do not represent the size of actual product; To those skilled in the art, in accompanying drawing some known configurations and explanation thereof may to omit be understandable.Describe position relationship in accompanying drawing only for exemplary illustration, can not be interpreted as the restriction to this patent.
As Figure 1-3, a kind of mean free error time testing machine, wherein, comprise testing machine main body 14, be located at the thermal wind exhausting passage 15 on testing machine main body 14, be provided with thermal wind exhausting device 12 in thermal wind exhausting passage 15, be provided with in testing machine main body 14 temperature in main body is carried out to the temperature-detecting device detected in real time; Testing machine main body 14 bottoms are provided with new wind entrance 16, in new wind entrance 16, are provided with new wind entrance operation valve 13; The circulation wind wheel 2 and the circulating fan 4 that be provided with well heater 5 in testing machine main body 14, testing machine main body 14 inner airs are circulated; Also comprise refrigerating plant and control device 3, control device 3 is electrically connected to above-mentioned thermal wind exhausting device 12, temperature-detecting device, new wind entrance operation valve 13, well heater 5, circulation wind wheel 2, circulating fan 4, refrigerating plant respectively.
Control device is provided with touch display screen, can control the parameters such as temperature in Comprehensive Control testing machine main body, voltage by control device, control device is standard container controller programming interface, but design temperature and magnitude of voltage on touch display screen, when needs are done 35 degree, during the operation of 300V voltage definite value, just directly at touch display screen, set.When selecting the walking program operation, can change the page at touch display screen and be set, as the 0th section (the program initial segment is 0 section), how many hours do, how many minutes, temperature was how many, voltage is how many again, sets, and then then sets first paragraph, how many hours do, how many minutes, temperature was how many, voltage is how many again, sets, and so analogizes, can set at most 50 sections, and program operation capable of circulation, 999 times capable of circulation at most.Program can be preengage start by set date or be stopped, and according to setting value, automatically turns round, and without personnel, intervenes.
Refrigerating plant comprises compressor, air-cooled condenser and the restriction device of being located at testing machine main body outside, is located at the evaporator of testing machine body interior.In the present embodiment, the common technology that the refrigeration principle of refrigerating plant is this area, do not describe in detail at this.
In Fig. 2, testing machine also comprises alternating current-direct current control power supply, with alternating current-direct current, controls a plurality of sockets 9 that power supply is connected, and socket 9 is distributed in the testing machine main body.The socket number of ac control power supply is 100, and the socket number of DC control supply is 100.The inner useful space of testing machine main body 14 is not less than 8(L) * 3.6(W) * 2.4(H) (m), each 100, interchange (10A), direct supply interface is provided, be evenly distributed in the side of specimen frame, so that the test of product power supply, reserved sample working signal passage.Specimen holder width 1m, divide two-layer up and down, being designed to can be from mobile taking out of in the testing machine main body, each 100 of both sides configuration alterating and direct current supply sockets are for sample in the testing machine main body, the specimen test supply voltage can be set in the chamber director demon, 6 of the test holes of the reserved Φ 50mm of testing laboratory, to do the input of sample working signal.In the testing machine main body, all distribution materials possess high temperature resistant specification.
In Fig. 2, the testing machine main body is provided with a body 10, and door body 10 is provided with transparent glass window, and door body 10 is thermal insulating door thermally insulated door.Heat preserving mode: heat room plate, two Kai Pingkai thermal insulating door thermally insulated door, gate-width is no less than 1.2 m, highly is not less than 2m, specimen holder can be shifted out in test room, has visual transparent windowpane.Be provided with smoke alarm in the testing machine main body.Prevention certain reason in the process of ageing prod makes the product burning and reports to the police, and when reporting to the police, can automatically close the burn-in chamber power supply.There is power supply earth leakage protection in the testing machine main body, the load short circuits protection.
In addition, also be provided with the RS-485 interface on control device.Temperature variation setting able to programme, can arrange the temperature value of different sections and as the loop cycle running test, circulation that can A.T.C, and there is LCD demonstration cyclic curve, and there is man-machine interface, be convenient to download curve, have the curve record function, the maximum holding time is no less than 60 days.The variable-frequency power sources of can controlling testing machine controller realizes supply voltage setting able to programme, the magnitude of voltage of different time section can be set and, as the loop cycle running test, have the curve record function.(variable-frequency power sources provides RS232 communication protocol).
In Fig. 3, also be provided with indoor lamp 7 in testing machine main body 14.The indoor location explosion proof illuminating lamp, improve bulb life, prevents the bulb explosion.
A kind of test method of utilizing described testing machine comprises the following steps:
S1. the sample arranged in the testing machine main body starts, heater starting, and the heat that the heat that sample produces and well heater produce, simultaneously to air heat in main body, when temperature arrives setting value, enters temperature constant state; If design temperature is greater than 15 degree than ambient temperature, enter step S2; If the thermal value of sample is not enough to maintain design temperature in the testing machine main body, enter step S3; If in the testing machine main body, actual temperature is greater than design temperature, enter step S4;
S2. start thermal wind exhausting device and new wind entrance operation valve, the hot blast in the testing machine main body is extracted out, the new wind of external environment condition enters the testing machine main body, utilizes low ambient temperature to carry out the heat in the balancer main body; Meanwhile, control device will automatically adjust the exhaust air rate (by Frequency Converter Control exhaust blower rotating speed) of thermal wind exhausting device and equipment self well heater add thermal output (being controlled by solid-state relay SSR);
S3. start the thermal wind exhausting device and quit work, start well heater, the well heater evolution of heat maintains design temperature in the testing machine main body;
S4. start thermal wind exhausting device and new wind entrance operation valve, utilize low ambient temperature to carry out the heat in the balancer main body, well heater quits work.
In step S4, if start after the thermal wind exhausting device can not balance sample thermal value, start refrigerating plant.
Obviously, the above embodiment of the present invention is only for example of the present invention clearly is described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all embodiments.All any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in the protection domain of the claims in the present invention.
Claims (10)
1. a mean free error time testing machine, it is characterized in that, comprise testing machine main body (14), be located at the thermal wind exhausting passage (15) on testing machine main body (14), be provided with thermal wind exhausting device (12) in thermal wind exhausting passage (15), be provided with in testing machine main body (14) temperature in main body is carried out to the temperature-detecting device detected in real time; Testing machine main body (14) bottom is provided with new wind entrance (16), in new wind entrance (16), is provided with new wind entrance operation valve (13); The circulation wind wheel (2) that be provided with well heater (5) in testing machine main body (14), testing machine main body (14) inner air is circulated and circulating fan (4); Also comprise refrigerating plant and control device (3), control device (3) is electrically connected to above-mentioned thermal wind exhausting device (12), temperature-detecting device, new wind entrance operation valve (13), well heater (5), circulation wind wheel (2), circulating fan (4), refrigerating plant respectively.
2. a kind of mean free error time testing machine according to claim 1, it is characterized in that: described refrigerating plant comprises is located at testing machine main body (14) outside compressor, air-cooled condenser (11) and restriction device, is located at the inner evaporator (6) of testing machine main body (14).
3. a kind of mean free error time testing machine according to claim 2, it is characterized in that: testing machine also comprises alternating current-direct current control power supply (8), with alternating current-direct current, controls a plurality of sockets (9) that power supply (8) is connected, and socket (9) is distributed in testing machine main body (14).
4. a kind of mean free error time testing machine according to claim 3, it is characterized in that: the socket of described ac control power supply (9) quantity is 100, the socket of DC control supply (9) quantity is 100.
5. a kind of mean free error time testing machine according to claim 1, it is characterized in that: described testing machine main body (14) is provided with a body (10), and a door body (10) is provided with transparent glass window, and a door body (10) is thermal insulating door thermally insulated door.
6. a kind of mean free error time testing machine according to claim 1, it is characterized in that: described control device is provided with touch display screen, and the testing machine main body is provided with smoke alarm in (14).
7. a kind of mean free error time testing machine according to claim 6, is characterized in that: also be provided with the RS-485 interface on described control device.
8. a kind of mean free error time testing machine according to claim 1, is characterized in that: also be provided with indoor lamp (7) in described testing machine main body (14).
9. a test method of utilizing the arbitrary described testing machine of claim 1 to 8 is characterized in that: comprise the following steps:
S1. the sample arranged in testing machine main body (14) starts, and well heater (5) starts, and the heat that the heat that sample produces and well heater (5) produce, simultaneously to air heat in main body, when temperature arrives setting value, enters temperature constant state; If design temperature is greater than 15 degree than ambient temperature, enter step S2; If the thermal value of sample is not enough to maintain the interior design temperature of testing machine main body (14), enter step S3; If the interior actual temperature of testing machine main body (14) is greater than design temperature, enter step S4;
S2. start thermal wind exhausting device (12) and new wind entrance operation valve (13), the hot blast in testing machine main body (14) is extracted out, the new wind of external environment condition enters testing machine main body (14), utilizes low ambient temperature to carry out the heat in balancer main body (14);
S3. start thermal wind exhausting device (12) and quit work, start well heater (5), well heater (5) evolution of heat maintains the interior design temperature of testing machine main body (14);
S4. start thermal wind exhausting device (12) and new wind entrance operation valve (13), utilize low ambient temperature to carry out the heat in balancer main body (14), well heater (5) quits work.
10. test method according to claim 9 is characterized in that: in described step S4, if start after thermal wind exhausting device (12) can not balance sample thermal value, start refrigerating plant.
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Application publication date: 20140101 |