DK156318B - PROCEDURE FOR CONTROLING A PRESSURE REGULATION SYSTEM FOR DURATION LOAD TESTS ON ONE OR SIMILAR MULTIPLE SAMPLING PARTS, NAMELY PLASTIC PIPE PIECES - Google Patents
PROCEDURE FOR CONTROLING A PRESSURE REGULATION SYSTEM FOR DURATION LOAD TESTS ON ONE OR SIMILAR MULTIPLE SAMPLING PARTS, NAMELY PLASTIC PIPE PIECES Download PDFInfo
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- DK156318B DK156318B DK345879A DK345879A DK156318B DK 156318 B DK156318 B DK 156318B DK 345879 A DK345879 A DK 345879A DK 345879 A DK345879 A DK 345879A DK 156318 B DK156318 B DK 156318B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2846—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for tubes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/023—Pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0464—Chucks, fixtures, jaws, holders or anvils with provisions for testing more than one specimen at the time
- G01N2203/047—Chucks, fixtures, jaws, holders or anvils with provisions for testing more than one specimen at the time in series
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0464—Chucks, fixtures, jaws, holders or anvils with provisions for testing more than one specimen at the time
- G01N2203/0476—Chucks, fixtures, jaws, holders or anvils with provisions for testing more than one specimen at the time in parallel
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0611—Hydraulic or pneumatic indicating, recording or sensing means
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- Life Sciences & Earth Sciences (AREA)
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- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measuring Fluid Pressure (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Description
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Opfindelsen vedr0rer en fremgangsmâde til sty-ring af et trykreguleringsSystem ved varighedsbe-lastningspr0ver pâ et eller samtidig pâ flere pr0ve-legemer, navnlig plastr0rstykker, med stort set sam-5 me tryk i afhængighed af pr0velegemets opf0rsel og den allerede forl0bne pr0vetid, og hvor den samlede pr0vetid kan ændres i afhængighed af den optrædende fejlhyppighed.The invention relates to a method for controlling a pressure control system by duration load tests on one or at the same time on several test bodies, in particular plastic pieces, with substantially the same pressure depending on the behavior of the test body and the test time already elapsed and total trial time may change depending on the frequency of errors occurring.
Ved de i det foregâende nævnte varighedsbelast-10 ningspr0ver gâr man ud fra, at pr0velegemerne gennem en meget lang tid udsættes for næsten samme tryk.For the duration tests mentioned above, it is assumed that the test bodies are subjected to almost the same pressure for a very long time.
Hvis der ikke optræder brud pâ pr0velegemerne inden for en bestemt tid, der er væsentlig lavere end den oprin-delige pr0vevarighed, gâr man nutildags ud fra, at 15 den samlede varighed af pr0ven kan være tilsvarende lavere, end hvis der opstâr brud f0r udl0bet af den samlede pr0vetid. Ved hvert brud under en parallel-pr0vning skulle den samlede pr0vetid sâledes fortrins-vis stadig forlænges. I tilfælde af en god kvalitet 20 ved pr0velegemerne og kun et ringe antal brud eller helt fejlfri afpr0vning ville man spare megen pr0ve-tid. Hidtil har man ikke haft nogen simpel behandling for sâdanne varighedsbelastningspr0ver, navnlig ikke noget fuldautomatisk styret forl0b.If no breakage of the test pieces occurs within a specified time that is substantially lower than the original test duration, it is nowadays assumed that the total duration of the test may be correspondingly lower than if a break occurs before the expiry of the test. the total trial time. Thus, for each break during a parallel test, the total test time should preferably still be extended. In the case of a good quality 20 at the test bodies and only a small number of fractures or completely flawless testing, you would save a lot of trial time. To date, no simple treatment has been conducted for such duration load tests, in particular no fully automatic controlled course.
25 Med opfindelsen tilsigtes der derfor tilveje- bragt en fremgangsmâde, ved hjælp af hvilken en fuldautomatisk styring af et trykreguleringssystem og et pr0veforl0b er muligt.The invention therefore aims to provide a method by which a fully automatic control of a pressure control system and a test process is possible.
Dette opnâs ved, at der ved hjælp af mindst 30 ët organ, der fastlægger en 0verste og en nederste, forud indstillet trykværdi for varighedspr0vning af et eller flere pr0velegemer, bestemmes en n0dvendig trykfor0gelse af den indstillede værdi, og at antallet af de til opretholdelse af trykket afgivne styreim-35 puiser bestemmes med jævne tidsmellemrum af passende 2This is achieved by determining, by means of at least 30 means which determine a top and a lower preset pressure value for the duration of one or more test bodies, a necessary pressure increase of the set value and the number of the pressure emitted control pulses are determined at regular intervals of appropriate 2
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. t \ tælleorganer i en centraistyreenhed, og at den centrale styreenhed endvidere omkobles til en ny bestemt samlet pr0vetid i afhængighed af et af centralstyre-enheden fastlagt, bestemt antal styreimpulser pr.. counting means in a central control unit, and that the central control unit is further switched to a new determined total test time in dependence on a determined number of control pulses per unit determined by the central control unit.
5 tidsenhed, der er n0dvendigt til opretholdelse af et forud bestemt tryk pâ pr0velegemet, idet centralstyre-enheden til konstatering af et beskadiget pr0velegeme f0rst ved hjælp af en passende lukning og âbning af de til pr0velegemerne h0rende ventiler omstilles til 10 enkeltpr0vning og efter konstatering og mærkning af det beskadigede pr0velegeme igen pâ fortsat parallel pr0ven uden det beskadigede pr0velegeme i et tids-rum afhængigt af den allerede forl0bne pr0vetid og antallet af udfaldne pr0velegemer.5 time unit necessary for maintaining a predetermined pressure on the test body, the central control unit for detecting a damaged test body first by means of a suitable closure and opening of the valves belonging to the test body for 10 individual testing and after detection of the damaged sample body again on a continued parallel sample without the damaged sample body for a period of time, depending on the test period already elapsed and the number of sample samples dropped.
15 Pâ denne mâde er det muligt ved hjælp af en cen tral styreenhed ikke blot at gennemf0re en simpel, ensartet trykregulering pâ en bestèmt værdi i pr0ve-legemerne, men ogsâ ved hjælp af den centrale styreenhed automatisk at fastslâ beskadigede pr0velegemer 20 og automatisk at fastlægge betingelserne for den vide-re varighedspr0vning, der skal gennemf0res.15 In this way, it is possible by means of a central control unit not only to carry out a simple, uniform pressure control at a fixed value in the test bodies, but also by means of the central control unit to automatically determine damaged sample bodies 20 and to automatically determine the conditions for the further duration test to be carried out.
If0lge en udf0relsesform for opfindelsen omfat-ter centraistyreenheden en mikrocomputer, der over en omsætter optager og forarbejder ordre ud fra forud 25 fastlagte data samt fastlægger den ny samlede pr0ve-tid.According to an embodiment of the invention, the central controller comprises a microcomputer which, over a transducer, records and processes orders based on pre-determined data and determines the new total test time.
Ved udnyttelsen af integrerede, elektroniske byggeenheder i en mikrocomputer kan den yderligere, n0dvendige styring konstrueres enkelt og billigt.By utilizing integrated electronic building units in a microcomputer, the additional, necessary control can be designed simply and inexpensively.
30 Endvidere kan der ogsâ senere indf0res yderligere betingelser, og yderligere data til yderligere ordre kan bearbejdes.30 Further conditions can also be introduced later and further data for further orders can be processed.
If01ge en yderligere udformning af opfindelsen bevirkes den f0rste omkobling til enkeltpr0vning 35 f0rst gennem centralstyreenheden efter et en gang fastlagt h0jere antal af gennem den centrale styreenhed afgivne impulser pr. tidsenhed. Herved sikres,According to a further embodiment of the invention, the first switch for single test 35 is effected first through the central control unit after a higher number of pulses delivered through the central control unit once determined. unit of time. This ensures,
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3 at den ved begyndelsen af varighedsbelastningspr0ven optrædende begyndende udvidelse af pr0velegemet ikke f0rer til en omkobling og sâledes til en ikke n0dven-dig kontrol af de enkelte pr0velegemer.3 that the initial expansion of the test body occurring at the beginning of the duration load test does not lead to a switching and thus to an unnecessary control of the individual test bodies.
5 If0lge endnu en udf0relsesform for opfindelsen overvâges de til pr0velegemerne f0rte, regelmæssige og ensartede trykfor0gelser af et manometer og aflastes acceleret ved hjælp af centraistyreenheden ved over-skridelse af trykket med en forud bestemt, over den 10 0verste grænse for den 0nskede varighedsværdi liggende trykværdi, der er fastlagt pâ et kontaktpunkt af et manometer, til den nederste, 0nskede værdi for varig-hedsværdien for varighedspr0vningen.According to yet another embodiment of the invention, the pressure, regular and uniform pressure increases of a pressure gauge monitored by the test bodies are monitored and accelerated by means of the central control unit by exceeding the pressure by a predetermined upper limit of the desired pressure value, determined at a contact point of a pressure gauge, to the lower desired value for the duration value of the duration test.
Pâ denne mâde er det muligt automatisk at fjerne 15 forstyrrelser, der kan optræde pâ grund af tilsmuds-ning af tilf0rsels- eller afgangskanaler for tryk-mediet. Sâdanne operationer kan foregâ flere gange efter hinanden, hvorved sikkerheden for fjernelse af forstyrrelser for0ges. Der kan nemlig forekomme sâdan-20 ne tilsmudsninger, som g0r flere sâdanne operationer efter hinanden n0dvendige. Gentagelsen heraf sker sa længe, til den normale, fastlagte grænseværdi for trykket overhôldes.In this way, it is possible to automatically remove 15 disturbances that may occur due to fouling of supply or discharge channels for the pressure medium. Such operations can take place several times in succession, thereby increasing the safety of interference removal. Namely, such soiling may occur which makes several such operations consecutively necessary. The repetition of this occurs for as long as the normal set limit value for the pressure is adhered to.
If0lge en yderligere udf0relsesform for opfin-25 delsen er der til for0gelse af reguleringsn0jagtigheden flere af styreenheden detekterbare mâlepunkter pâ manometeret. Pâ denne mâde sikrer man sig en tilstræk-kelig n0jagtighed ogsâ ved overl0b af kontakterne.According to a further embodiment of the invention, for measuring accuracy, there are several measurement points detectable by the control unit on the manometer. In this way, sufficient accuracy is also ensured when the contacts are over.
Opfindelsen forklares nærmere i det f0lgende 30 under henvisning til tegningen, hvor fig. 1 viser et apparat til gennemf0relse af fremgangsmâden if0lge opfindelsen med flere eller enkelte pr0velegemer skematisk angivet, fig. 2 skematisk hvorledes antallet af impulser 35 kan angives i forhold til tiden, og fig. 3 et diagram til forklaring af fremgangsmâden if01ge opfindelsen, hvor trykket er angivet iThe invention will be further explained in the following with reference to the drawing, in which: FIG. 1 is a schematic diagram of an apparatus for carrying out the method according to the invention with several or single test bodies; FIG. 2 schematically shows how the number of pulses 35 can be indicated in relation to time; and FIG. 3 is a diagram for explaining the method according to the invention in which the pressure is indicated in
. DK 156318B. DK 156318B
4 forhold til tiden. Af dette skema ses det, hvorledes en hurtig aflastning af mediet kan styres ved over-skridelse af bestemte, h0jere spændingstærskler.4 relationships over time. This diagram shows how a quick relief of the medium can be controlled by exceeding certain higher voltage thresholds.
Den i fig. 1 viste styreenhed er forsynet 5 med integrerede, elektroniske koblingskredse og med en mikrocomputer. Mikrocomputeren s0rger i afhængig-hed af modtagne informationer og oplagrede informa-tioner for tilvejebringelsen af ordrer, der er n0d-vendige til styring af de til trykfor0gelse i pr0ve-10 legemerne beregnede organer, eksempelvis magnet-ventiler, og til en central luft-/vandpumpe.The FIG. 1, the control unit shown in Fig. 5 is provided with integrated electronic switching circuits and with a microcomputer. The microcomputer relies on information received and stored information to provide orders necessary to control the pressure increase means in the test bodies, for example, magnetic valves and Waterpump.
Ved de gennemf0rte varighedsbelastningspr0ver gâr man ud fra, at fors0get kan betragtes som afslut-tet, hvis ikke noget pr0velegeme under pr0veopera-15 tioneme er faldet ud inden for en vis tid, f.eks.In the completed duration load tests, it is assumed that the test can be considered completed if no sample body during the test operations has dropped out within a certain time, e.g.
60 timer. Alt efter οια imidlertid et pr0velegeme faider ud#efter at der er gâet en vis tid, eller flere pr0velegemier f aider ud efter et andet tids-forl0b, mâ der fra den centrale styreenhed be-20 · stemmes en ny samlet pr0vetid ved hjælp af mikrocomputeren. Det er klart, at pr0vetiden bliver længere desto flere pr0velegemer,der faider ud inden for en forud bestemt tid efter begyndelsen af vedkommen-de varighedspr0ve. Dette betyder altsâ, at der ved 25 hvert udfald af et pr0velegeme mâ bestemmes, hvor meget pr0vetid der allerede er forl0bet, og hvor mange pr0velegemer der pâ dette tidspunkt allerede er faldet ud. üd fra den derefter kendte, 10bende samlede pr0vetid mâ den nye pr0vetid, der skal fast-30 lasgges, bestemmes . Ikke blot pr0vetiden mâ fastlæg-ges, men det mâ ogsâ bestemmes, hvilke pr0velegemer der er beskadigede. Med dette formâl mâ den centrale styreenhed kunne omstilles vilkârligt fra pr0vning af flere legemier til enkeltpr0vning og omvendt.60 hours. However, depending on whether a sample body fails # after a certain amount of time has elapsed, or more sample bodies fade out after another time period, a new total sample time must be determined by the microcomputer from the central controller. . Obviously, the longer the trial body expires within a predetermined time after the commencement of the duration test. This means that at every 25 outcomes of a trial body, it must be determined how much trial time has already elapsed and how many trial bodies have already expired at this time. From the then-known 10-leg total test time, the new test time to be determined must be determined. Not only does the test time have to be determined, but it is also necessary to determine which test bodies are damaged. With this purpose, the central control unit could be switched arbitrarily from testing multiple bodies to single testing and vice versa.
35 Pr0velegemer, der f0rst er blevet konstateret beskadigede, mâ ikke mere optages i den samlede afpr0vning.35 Samples that were first found to be damaged must no longer be included in the overall test.
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55
De mâ derfor under pr0vens forl0b centrait være mar-keret som sâdanne. Ventilerne til vedkommende pr0ve-legemer mâ svare til pr0velegemernes tilstand, og 5 den samlede eller enkeltpr0vningen mâ kunne styres i henhold hertil.Therefore, during the course of the test, the centrait must be marked as such. The valves for the test specimens must correspond to the condition of the specimens, and the total or single test may be controlled accordingly.
Til den centrale styreenhed h0rer der, som allerede omtalt i det foregâende, til gennemf0relse af styreoperationerne ikke blot en mikrocomputer, 10 men ogsâ tælbkoblere og lagerkobleorganer. Mikrocom-puteren tjener til forarbejdning af indgâende in-formationer i afhængighed af oplagrede informationer.The central control unit includes, as already mentioned above, for carrying out the control operations not only a microcomputer, but also counter couplers and storage switching means. The microcomputer serves to process incoming information in reliance on stored information.
Tællerne tjener i hovedsagen til tælling af antallet af impulser pr. tidsenhed, medens lagerkobleorganerne 15 tjener sâvel til oplagring af bearbejdede informationer, f.eks. indgâende impulser (efter hver tidsenhed kan vedkommende lager igen slettes), men ogsâ til oplagring af kendetegn og adresser for pr0ve-legemer, der er beskadigede, sâ at man for at spare 20 arbejdstid kan undgâ en ikke n0dvendig kontrol af sâdanne pr0velegemer under samle- og enkeltpr0vnin-ger.The counters mainly serve to count the number of pulses per second. unit of time, while the storage coupling means 15 serve as well for storing processed information, e.g. incoming pulses (after each unit of time, the storage in question can be deleted again), but also for storing the characteristics and addresses of damaged bodies, so that in order to save 20 working hours an unnecessary control of such sample bodies can be avoided during collection. and single tests.
Til opnâelse af samarbejde mellem de organer, der h0rer til den centrale styreenhed, er en passen-25 de sammenkobling n0dvendig, som fremgâr af fig. 1.In order to achieve cooperation between the organs belonging to the central control unit, a suitable interconnection is required, as can be seen in FIG. First
De i fig. 1 angivne pile angiver retningen for in-formationsforl0bet. De fra den centrale styreenhed ESt udgâende pile angiver, fra hvilke midler, f.eks. ventiler, kontaktmanometer, den centrale styreenhed 30 fâr sine informationer, eller til hvem den afgiver sine ordrer. Aile informationer, der indgâr til den centrale styreenhed, og aile ordrer, der afgives, mâ omsættes pâ passende mâde, hvorfor der foran mikrocomputeren CPU er mindst ên omsætter U1 og 35 eventuelt en efterindkoblet yderligere omsætter U2.The 1 arrows indicate the direction of the information flow. The arrows from the central control unit ESt indicate which means, e.g. valves, contact manometer, central control unit 30 receives its information or to whom it places its orders. All information provided to the central control unit and all orders placed must be appropriately transposed, which is why in front of the microcomputer CPU there is at least one converter U1 and optionally a further switched on converter U2.
Under visse forudsætninger kan de to omsættere være kombineret.Under certain conditions, the two converters may be combined.
• t• t
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6 I fig. 2 er det vist, hvorledes den centrale styreenheds impulser kan afbildes i forhold til tiden. Af det i fig. 2 viste diagram fremgâr det, at den f0rste for0gelse af antallet af impulser pr.6 In FIG. 2, it is shown how the pulses of the central control unit can be mapped in relation to time. Of the embodiment shown in FIG. 2 shows that the first increase in the number of pulses per
5 tidsenhed f.eks. andrager 50%, og at den anden spids optræder i et andet tidsafsnit, men kun andrager 30%. Den f0rste spids kan optræde ved, at pr0ve-emnet efter den f0rste for0gelse af trykket fâr en st0rre udvidelse. Dette er normalt ved pr0vning af 10 plastr0r. Kun den anden udvidelse, dvs. for0gelsen af antallet af impulser pr. tidsenhed, optræder i reglen, nâr der er fare for brud. Dette betyder, at ikke blot den f0rste og eventuelt de efterf0lgende spidser er kritiske for antallet af impulser pr.5 time unit e.g. is 50%, and the second tip appears in a different time section, but only 30%. The first tip may occur in that the sample blank after the first increase in pressure causes a larger expansion. This is usually when testing 10 plastic tubes. Only the second extension, ie. the increase in the number of pulses per rule of time, usually occurs when there is a danger of breakage. This means that not only the first and possibly the subsequent peaks are critical to the number of pulses per second.
15 tidsenhed. Overskrider antallet af impulser pr. tidsenhed en bestemt værdi, f.eks. 30%, betyder dette, at der med sikkerhed er optrâdt brud i et pr0velegeme, og at en efterregulering af trykket inden for det normale tidsafsnit ikke er mulig. En sâdan 20 for0gelse bestemmes ved sammenligning af den optalte værdi i tælleren Z med en given værdi, der bestemmes ud fra trykket for varighedspr0vningen. Er dette tilfældet, afgiver tælleren Z en impuls, der f0rer til, at der over mikrocomputeren CPU gives ordre 25 til omstyring fra samlet pr0vning til enkeltpr0vning.15 unit of time. Exceeds the number of pulses per unit of time a certain value, e.g. 30%, this means that fracture in a sample body has certainly occurred and that a subsequent adjustment of the pressure within the normal time section is not possible. Such an increase is determined by comparing the counted value in the counter Z with a given value determined from the pressure of the duration test. If this is the case, the counter Z emits an impulse that causes the CPU 25 to be passed through the microcomputer CPU for redirection from total test to single test.
If0lge denne ordre lukkes aile ventiler und-tagen den f0rste ventil VI. Pâ denne mâde kan efter hinanden aile pr0velegemerne kontrolleres ved âbning og lukning af ventiler. De pr0velegemer, der er kon-30 stateret beskadigede, og som bestemmes ved den sam-me metode med tælling af impulserne pr. tidsenhed ved et bestemt varighedstryk, bliver ved optagelse af et særligt kendetegn og adresse for pr0velegemet markeret i et lager Sp i den centrale styreenhed 35 ESt. Denne markering tjener til efter et konstateret brud at hindre, at denne ventil ved samlet pr0vningAccording to this order, all valves except the first valve VI are closed. In this way, the test bodies can be checked one after the other by opening and closing the valves. The specimens found to be damaged and determined by the same method of counting the pulses per time unit at a particular duration pressure, upon recording a particular characteristic and address of the sample body, is marked in a storage Sp in the central control unit 35 ESt. This marking serves to prevent this valve from being tested during a joint test after a failure
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7 eller ved en efterf01gende enkeltpr0vning endnu engang bliver indkoblet i pr0vesystemet. De til disse pr0ve-legemer svarende ventiler ma altsâ ikke mere âbnes ved de f01gende pr0veoperationer. F0rst efter afslut-5 tet samlet pr0vning sker âbningen for pâ denne mâde igen af frigive aile pr0vetilslutningerne.7 or by a subsequent single test is once again connected to the test system. Thus, the valves corresponding to these test bodies must no longer be opened during the following test operations. Only after the end of the total test is the opening for this way again the release of all the test connections.
Magnetventilen V og luft-/vandpumpen P i pr0veindretningen s0rger for tilf0rsel af medium til de pr0velegemer, hvis ventiler er âbne. Parallelpr0v-10 ningen forl0ber i den af den centrale styreenhed an-givne samlede pr0vetid, der bestemmes i afhængighed af den allerede forl0bne pr0vetid og de konstaterede, beskadigede pr0velegemer. Pâ denne mâde kan den samlede pr0vetid ændres svarende til kravene.The solenoid valve V and the air / water pump P in the test device provide for the supply of medium to the test bodies whose valves are open. The parallel test runs in the total test time indicated by the central control unit, which is determined depending on the test time already elapsed and the damaged test bodies found. In this way, the total test time can be changed according to the requirements.
15 I fig. 3 er der angivet et diagram, hvorpâ for- holdet tryk til tid er anf0rt. Til mâlingen af det til varighedspr0vningen fastlagte tryk er der et kontaktmanometer M, der mindst har to mâlepunkter SI og S2. Ved et kontaktmanometer er dette enkle, 20 f.eks. fotoelektriske, kontakter, der kan aktiveres ved over- eller underskridelse af det fastlagte tryk.In FIG. 3, a diagram is given on which the pressure to time ratio is indicated. For the measurement of the pressure determined for the duration test there is a contact manometer M having at least two measuring points S1 and S2. By a contact manometer this is simple, e.g. photoelectric switches that can be activated by exceeding or below the set pressure.
Da disse kontakter har en vis reaktionstærskel (hysterese), viser der sig ved den samme kontakt smâ spændingsforskelle ved stigende tryk og ved aftagen-25 de tryk, hvilket giver en bedre mulighed til forkla-ring af det samlede for10b. Dette er der gjort brug af i diagrammet i fig. 3, hvor trykket for slutning af kontakten ved overskridelse af den fastsatte spændingsgrænse er markeret med Po, og trykket for 30 underskridelse af den fastsatte spændingsgrænse er angivet med Pu. Herudfra kan det fastslâs, at der i til hinanden svarende lige store tidsafsnit Al-Ax f0rst er et st0rre antal impulser n0dvendig for at holde trykket pâ den fastlagte værdi, og at dette 35 antal af impulser pr. tidsenhed, der er n0dvendig for opretholdelse af trykket, stadig aftager.Since these contacts have a certain reaction threshold (hysteresis), small voltage differences appear at the same contact at increasing pressure and at decreasing pressure, which provides a better explanation for the total forb. This is used in the diagram of FIG. 3, where the pressure for closing the contact when exceeding the set voltage limit is marked with Po and the pressure for exceeding the set voltage limit is indicated by Pu. From this it can be stated that in correspondingly equal time sections Al-Ax first a larger number of pulses is necessary to keep the pressure at the determined value, and that this number of pulses per the unit of time needed to maintain the pressure is still decreasing.
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88
Foregâr der imidlertid nu pâ et tidspunkt Ax+1 et brud i et pr0velegeme, vil antallet af impulser pr. tidsenhed igen tiltage, og i et af de efterf0lgende tidsafsnit, f.eks. Ax+2 er antallet af impulser pr.However, if at one point Ax + 1 breaks into a test body, the number of pulses per time unit again, and in one of the subsequent time sections, e.g. Ax + 2 is the number of pulses per second.
5 tidsenhed 30% eller mere over det normale gennemsnits-antal impulser. Tælleren konstaterer dette h0je antal impulser og sammenligner med den oplagrede, forud fastlagte værdi i den centrale styreenhed ESt.5 time unit 30% or more above the normal average number of pulses. The counter detects this high number of pulses and compares with the stored, predetermined value in the central control unit ESt.
Hvis man gâr ud fra, at der eksempelvis til af-10 pr0vning af PVC-r0r skal anvendes en mindste pr0vevarig-hed pâ 1000 timer, er det klart, at det er fordelag-tigt at automatisera en sâdan varighedspr0vning. En sâdan automatisering er sâ meget mere formâlstjenlig, eftersom det er vedtaget, at pr0vetiden kan nedsæt-15 tes væsentligt i afhængighed af et lavere antal be-skadigede pr0velegemer.Assuming, for example, that a minimum test duration of 1000 hours is to be used for testing PVC pipes, it is clear that it is advantageous to automate such a duration test. Such automation is so much more desirable, since it has been decided that the testing time can be significantly reduced depending on a lower number of damaged sample bodies.
Af fig. 3 fremgâr det endvidere, at der ved overskridelse af det forud fastlagte tryk for varig-hedspr0vningen kan frembringes en styreordre, eksem-2° pelvis pâ en værdi Pü ved et andet mâlepunkt S2, der ved hjælp af den centrale styreenhed muligg0r en sâdan âbning af en yderligere ventil Vü, at der muligg0res en hurtig aflastning af trykket til den nedre, fastlagte trykværdi. Dette kan forekomme 25 flere gange. Den hurtige aflastning af trykket s0rger for en selvrensning af de i systemet værende værdier, hvorved en automatisk fjernelse af forstyrrelser bli-ver muligt. Da der ved enhver sâdan forstyrrelse gi-ves en passende information til den centrale styre-50 enhed, er der ogsâ i denne en mulighed for detekte-ring af antallet af forstyrrelser i et vist tidsrum og/eller efter hinanden f0lgende forstyrrelser, hvorved ogsâ en særlig, optisk og/eller akustisk signa-lering til pr0vepersonalet kan styres. Parallelt 35 hermed kan der ogsâ gives udtryk for resultatet af forstyrrelserne med angivelse af de indretninger,In FIG. 3 further shows that by exceeding the predetermined pressure for the duration test, a control order can be produced, for example 2 ° at a value Pü at another measuring point S2, which allows such opening of the central control unit a further valve Vü that a rapid relief of the pressure to the lower, determined pressure value is allowed. This can occur 25 more times. The rapid relief of the pressure ensures a self-cleaning of the values in the system, which makes possible an automatic removal of disturbances. Since, in any such disturbance, appropriate information is provided to the central control unit, there is also in it a possibility of detecting the number of disturbances for a certain period of time and / or consecutive disturbances, thereby also special, optical and / or acoustic signaling to the test personnel can be controlled. In parallel, the result of the disturbances can also be expressed, indicating the devices,
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9 der har været indblandet heri, og/eller pr0velegemerne med passende adresseangivelse.9 which have been implicated herein, and / or the sample bodies with appropriate addressing.
For at opnâ en tilstrækkelig h0j regulerings-n0jagtighed er kontaktmanometeret i omrâdet ved spæn-5 dingen S2 forsynet med flere kontaktpunkter. Her-ved hindres det, at der ved overl0b af en 0nsket værdi og manglende ordreafgivels e ikke sker en hur-tig aflastning af trÿkket.In order to obtain a sufficiently high control accuracy, the contact manometer in the area at voltage S2 is provided with several contact points. This prevents a rapid relief of the draft by overflowing a desired value and failure to place an order.
Endel'ig skal (Set nævnes, at der ved ny bereg-10 ning af den samlede pr0vetid efter udfald af et pr0velegeme ogsâ tages hensyn til den tid, der er bort-faldet und.er de geimemf0rte enkeltpr0verækker. Til dette formai er der digitale tidsmâleorganer i for-bindelse med den centrale styreenhed, til hvis re-15 sultat der tages hensyn i mikrocomputeren.Finally, (It should be mentioned that when recalculating the total test time after the failure of a test body, the time elapsed during the space-sampled single test specimens is also taken into account. For this purpose, there are digital timing means in conjunction with the central controller, the result of which is taken into account in the microcomputer.
Som manometer M kan der sâvel anvendes det omtalte kontaktmanometer som et digitalmanometer.As the pressure gauge M, the mentioned contact pressure gauge can also be used as a digital pressure gauge.
Claims (5)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2836508 | 1978-08-21 | ||
| DE19782836508 DE2836508C3 (en) | 1978-08-21 | 1978-08-21 | Method for controlling a pressure regulation system in the case of permanent load tests taking place on one or simultaneously on several test objects, in particular plastic pipe sections |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DK345879A DK345879A (en) | 1980-02-22 |
| DK156318B true DK156318B (en) | 1989-07-31 |
| DK156318C DK156318C (en) | 1989-12-11 |
Family
ID=6047546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK345879A DK156318C (en) | 1978-08-21 | 1979-08-17 | PROCEDURE FOR CONTROLING A PRESSURE REGULATION SYSTEM FOR DURATION LOAD TESTS ON ONE OR SIMILAR MULTIPLE SAMPLING PARTS, NAMELY PLASTIC PIPE PIECES |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE2836508C3 (en) |
| DK (1) | DK156318C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5438862A (en) * | 1994-02-14 | 1995-08-08 | Westinghouse Elec Corp | System and method for in situ testing of the leak-tightness of a tubular member |
| CN103234706A (en) * | 2013-04-25 | 2013-08-07 | 江苏中核利柏特股份有限公司 | Pneumoelectric distributor for testing gas tightness of process module pipeline |
-
1978
- 1978-08-21 DE DE19782836508 patent/DE2836508C3/en not_active Expired
-
1979
- 1979-08-17 DK DK345879A patent/DK156318C/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE2836508B2 (en) | 1980-08-28 |
| DE2836508A1 (en) | 1980-03-06 |
| DK345879A (en) | 1980-02-22 |
| DE2836508C3 (en) | 1981-04-16 |
| DK156318C (en) | 1989-12-11 |
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| Date | Code | Title | Description |
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| PBP | Patent lapsed |