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撼神高頻率液壓缸應用在疲勞試驗機 疲勞試驗機技術指標

時間：2020-07-30    來源：儀多多儀器網(wǎng)    作者：儀多多商城     
Hydraulic cylinder vibrates to a 400 Hz sine.

(DYNA-MESS Gmbh) and Hänchen reach new heights of performance

Modern quality standards mean that components are now facing more varied and useful tests than at any time before. DYNA-MESS Testing Systems specialises in testing machines for dynamic component and material testing. With its broad and varied range of standard and special test machines, the Aachen-based company exploits the possibilities of modern fluid technology to the best advantage. Its pièce de resistance is a special testing machine for elastomers which, with the help of standard hydraulic cylinders from Hänchen, realises controlled vibrations of 400 Hz in order, for instance, to test the damping of bearing elements made of rubber-metal composites for the automotive industry.

Hydraulics is cutting-edge technology

According to Dr. Marcus Jarchow, Managing Director of DYNA-MESS, "these test units are exposed to extreme stresses with a nominal force of 10 kN and a frequency of anything from 0 to 400 Hz. It has been extremely difficult to find a suitably high-performance hydraulic cylinder on the hydraulics market", because the test device depends on the perfect stick-slip behaviour of the hydraulic system. Cylinders with hydrostatically supported piston rod guides are normally used for this type of application, but the technical expenditure for this solution is enormous. "We have nevertheless kept our ears to the ground to try and find out who can offer some help with finding a solution" stated the Managing Director of DYNA-MESS. "Everybody hesitated when we mentioned the technical requirements, with the exception of Hänchen Hydraulik. A further argument in their favour was that they had their own test equipment and would be able to base their results on extensive experience. Ultimately, the hydraulic specialists from Ostfildern, near Stuttgart, offered a standard cylinder with patented, floating annular gap seal which is considerably more cost-effective than drives with hydrostatically supported piston rod guides". The PZL assembly series from Hänchen, however, also provides these high-end cylinders.

The PZR floating annular gap seal

The patented, floating annular gap seal from Hänchen permits the use of cost-effective PZR high-end test cylinders, in which a steel sleeve is positioned through a choke gap and thereby creates a contact-free sealing gap of just a few 1/100 mm. This process can, however, only function correctly with a production accuracy of only a few µm, as leaks would otherwise lead to an unacceptable loss of hydraulic fluid. This PZR assembly differs only by the slightly lesser absorption of the lateral forces from a cylinder with hydrostatically supported piston rod guide, but yields a considerable cost advantage. Thanks to their negligible friction, however, PZR cylinders offer maximum positioning and repeat accuracy and are stick-slip free, making them ideally suitable for extremely slow as well as fast movements and minimum travel over ranges of a very few µm. As lateral forces are not experienced in this 400 Hz DYNA-MESS test equipment, the decision was made in favour of these cylinders.

High-quality peripherals

The cylinder is equipped with a special inductive position measuring system and a force transducer with an extremely low natural frequency and yield measuring strips. Both sensors supply analog output signals which are digitalised with a resolution of 16 Bit and tested with more than 20 kHz. They supply the control with the necessary data, which must be converted practically in real time by a control card with its own high-performance processor. Tried-and-tested DYNA-MESS software modules were adapted to the special conditions to facilitate programming. A PC forms the basis for the Windows user interface. The valves represented yet another technical challenge, as they have to work with a control frequency of 16 kHz. The fluid circuit has been designed for 300 bar and operates at 40 l/min. This high power density enabled a low design size, because a high frequency with a wide frequency spectrum places extremely high demands on the mechanical construction: the frame must not have any natural resonance over the whole of the frequency range.

Commissioning

Commissioning proved to be a time-consuming exercise, particularly due to the need to tune in to the various frequency ranges. The frequency was increased in steps of 10, 20, 30 … up to 400 Hz, with the resonance having to be minimised at every stage. The complete control was also tuned during this time, in that the runtime delays between the reaction of the processor and its execution by the hydraulic system are captured and included in the control. Finally the control quality and curve form were optimised, this operation being followed by fine tuning with the help of a friction-free and loss-free spring, which measures the dynamic without phase displacement and so enables material tests to be carried out under clearly defined conditions. After up to 400 Hz had been reached, Dr. Jarchow’s team carried out further tests up to a frequency of 1,000 Hz. "We were surprised at what outputs were possible, up to double the nominal output at 800 Hz", said the hydraulic specialist. "It was only above this frequency that the limits of what is technically feasible at the moment were clearly reached. The hydraulic cylinder has more than matched the requirements placed on it, and that was with the use of a catalogue cylinder and at a very attractive price”. The finished system was then commissioned during the first quarter of 2002.

Practical application

Hänchen’s PZR hydraulic cylinders are now being used by a Daimler-Chrysler supplier to test vibration dampers for engine and gearbox suspensions for load carrying ability, damping behaviour and service life. These components are made from rubber-metal composite material with embedded passive hydraulic damping. The sealed glycol circuit in this component is used to dampen the vibrations. A new test bench enables the developers to optimise the damping characteristics. Sweep tests with a pre-selected load which corresponds to the engine or gearbox weight are used to determine at which frequency damping is most effective. For this test the frequency is superimposed over the static load with the aim of achieving an optimised damping over the whole frequency range of up to 400 Hz."

Our engineering competence, the experience and evaluation of our suppliers as well as the ability to develop test solutions together with our customers were the deciding factors", explained Dr. Jarchow, whose team performs all calculations, is responsible for design, software, electronic development, control, configuration as well as installation and realises the complete system in co-operation with the suppliers. "Suppliers whose products conform to our own high standards play a critical role. That is why we are working together with Hänchen Hydraulik".



    今天我們來講一下怎么維護保養(yǎng)橡膠緩沖塊疲勞試驗機。

    1、定期更換油路濾芯，對變質(zhì)油及時清理。設備運行過程中，難免會出現(xiàn)一些故障，故障讓金屬造成污染，污染到濾芯，所以定期更換系統(tǒng)的油路濾芯，把被污染的油或者是已經(jīng)不干凈的油清理掉，及時更換新的油。不僅可以提高工作效率，而且也可以減少設備出現(xiàn)故障。

    2、更換液壓油，并且加強管理。液壓油長期工作，一定會有氧化焦化的現(xiàn)象出現(xiàn)，而且在液壓系統(tǒng)中會零件容易磨損，一旦磨損就會有金屬屑摻雜在液壓油中，大大降低油品，造成嚴重故障。有專家表示，液壓油的更換周期一般在十個月，這樣可以保障設備正常運轉(zhuǎn)。

    3、更換伺服閥。設備出現(xiàn)故障，也有可能是伺服閥的動作不良所造成，所以定期清洗和更換伺服閥是很關鍵的，既能夠防止污染，也可以杜絕出現(xiàn)故障。

    4、更換密封圈。密封圈主要是為了防止出現(xiàn)漏油的現(xiàn)象，如果密封圈不在密封，應該及時更換，保持有效工作。

    5、更換濾芯，想要保持液壓系統(tǒng)的干凈衛(wèi)生，濾芯一定要及時更換，工作人員結(jié)合實際情況來調(diào)整更換周期即可，畢竟每臺設備的工作量不太一樣。






疲勞試驗機的維護方法
　　疲勞試驗機用于進行測定金屬、合金材料及其構(gòu)件在室溫狀態(tài)下的拉伸、壓縮或拉壓交變負荷的疲勞特性、疲勞壽命、預制裂紋及裂紋擴展試驗。疲勞試驗機需要進行定期的維護可以保障儀器的正常運行，那么用戶應該如何維護疲勞試驗機呢?下面小編就來具體介紹一下疲勞試驗機的維護方法。

　　1、定期更換油路濾芯，清理變質(zhì)油

　　電液伺服壓力試驗機由于此次故障由液壓油中金屬污染造成，因此定期更換該系統(tǒng)油路中的濾芯，放掉濾油器中存油，可防止污物進入伺服閥，有效的防止故障發(fā)生，延長伺服閥的運行時間。

　　力矩馬達和先導閥完全浸泡在與回油相通的油液里，位置又處于管道的盲端，所以該處的油液幾乎不流動，易氧化變質(zhì)，因此需定期放掉變質(zhì)的液壓油。

　　2、定期更換液壓油，加強液壓油的管理

　　液壓油在長期工作中會氧化焦化，并且液壓系統(tǒng)中的泵.閥、油缸等的磨損，會產(chǎn)生一些金屬屑，它們會降低液壓油的品質(zhì)，造成故障。根據(jù)近幾年液壓油使用周期和油品化驗結(jié)果，要每10個月更換一次液壓油，才能保證設備無計劃外停機。

　　3、定期更換伺服閥

　　有些故障的直接原因為力矩馬達被污染導致伺服閥動作不良，因此定期清洗、更換力矩馬達和先導閥，防止污染，從而杜絕故障發(fā)生。伺服閥的裝拆應在盡可能干凈的環(huán)境中進行，操作時應先去掉接到伺服閥上的電氣信號，再卸掉液壓系統(tǒng)的壓力，然后拆下伺服閥。在干凈、相容的商用溶劑中清洗所有的零件，零件可以晾干或用軟氣管以潔凈、干燥的空氣吹干。清洗后的伺服閥，可以作為備件輪流使用，降低費用。

　　4、定期更換密封圈

　　定期檢查主機和油源處是否有漏油的地方，如發(fā)現(xiàn)有漏油，應及時更換密封圈或組合墊

　　5、定期更換濾芯

　　液壓濾芯概述液壓濾芯應用在液壓系統(tǒng)中，用于濾除系統(tǒng)中的顆粒雜物及橡膠雜質(zhì)，保證液壓系統(tǒng)的清潔度，根據(jù)機器的使用情況及油的使用期限，定期更換吸油過濾器和濾芯。余姚表；立式恒溫恒濕試驗箱：日本優(yōu)易控儀表；潔度，根據(jù)機器的使用情況及油的使用期限，定期更換吸油過濾器和濾芯。

標簽: 疲勞試驗機
疲勞試驗機 疲勞試驗機的維護方法_疲勞試驗機

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