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仪器交易网 > 仪器知识 > 操作使用 > 动静万能疲劳试验机 疲劳试验机如何操作

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动静万能疲劳试验机 疲劳试验机如何操作

时间：2020-08-27    来源：仪多多仪器网    作者：仪多多商城     
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    说到弹簧疲劳试验机，众多人也许对其工作原理有所了解，但在维护保养工作上无法做好。本文就和大家一起了解一下疲劳试验机维护保养相关知识。
    1、弹簧试验机在正常工作状态下，误差需要校验一次，其有效周期为一年。误差校验是非常重要的工作，只有经过精准的校验，才能保证测量的数据精准无误。反之，校验工作不正规的话，会影响试验机测量，无法满足人们测量需求。
    2、弹簧试验机在操作的过程中，一定要注重卸荷问题。卸荷的时候不能猛地松手，这样会使设备产生强烈的震动，影响试验机的精度。
    3、试验机升降齿条及油杯中应该要经常加入润滑油，保证试验机不会经常出现死机的状态。润滑油的作用主要是将保证设备更好的运行，同时能提升设备的运行效率。
    4、试验机如果使用完毕之后，应该要对其进行保护，罩上机衣，防止灰尘落入设备之中，影响设备的正常使用，降低设备的使用寿命。
    5、使用试验机的坏死后应该要妥善保护，安全接地，才能保证其使用标准，测量精准的数据信息。
    6、试验机要定期清洗，由于设备长期工作，设备中会含有大量的灰尘屑，影响设备正常测量。如果长期不清洗灰尘，一定会给设备带来测量负担，影响设备测量的精准度。





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".

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