What should we pay attention to when buying spiral protective sleeve?

Spiral protective sleeve is widely used in loaders, excavators, cranes, mining machinery and agricultural machinery equipment. Its main function is to protect the safety of oil, electricity and steam pipelines of the above vehicles, avoid wear and collision, improve the service life of pipelines and ensure the safety of construction operations.

So how to choose a suitable protective cover and what precautions should be taken when buying it? The editor interviewed the factory technical expert of parlmu --- engineer Wei. Let's listen to his experience.

First, observe the surface, and the surface of spiral sheath shall be smooth and flat; No shortage, crack and burr. Since the protective sleeve has extremely strict requirements on material and cannot be doped with impurities such as recycled materials, there shall be no obvious blistering and unevenness during visual observation.

Second, feel the hardness. The excellent protective sleeve hardness is generally shore 85-90 degrees. Deviation from this range does not meet the requirements. The hardness is too low to protect and bind the inside of the pipeline. The hardness is high, and the protective sleeve is easy to brittle crack in low temperature environment (such as some areas in northern China), which can not meet the use requirements.

Third, high and low temperature resistance. The qualified protective sleeve shall have good high and low temperature resistance. The protective sleeve can be placed in the environment of 80 ° high temperature and - 40 ° low temperature respectively to observe whether the protective sleeve has cracking, sticking and depression.

Fourth, oil resistance. Because the protective sleeve is in the environment of protecting the oil circuit for a long time, there are certain requirements for the oil resistance of the protective sleeve. The spiral sheath can be immersed in the mixture of 70# gasoline and 10% toluene for observation for 5 minutes. If there is no discoloration. Sticking and other phenomena are qualified products.

Fifth, wear resistance. The spiral protective sleeve produced by regular factories has good wear resistance. The protective sleeve produced by zoyou Zhonggong adopts international standardized production process, and each product is tested by "Akron wear test". The quality difference of test results is less than 0.07 to ensure that they are qualified. When purchasing, you can ask the other party to produce the quality inspection report issued by the quality and technical supervision department to distinguish the authenticity.

Sixth, tensile strength and impact strength. High quality and qualified spiral protective sleeve has good tensile strength and impact strength. The tensile strength at room temperature is generally 25 ~ 30MPa; The impact strength is generally: notch, 35kJ / m2 at room temperature and 5kj / m2 at - 40 / 24h. The impact strength (without notch): continuous. This item belongs to the national standard value. You can view the product test report when purchasing.

Seventh, anti ultraviolet, the spiral protective sleeve should have good anti ultraviolet performance. Because the protective sleeve is in the harsh environment such as wind, sand and sun exposure for a long time, the protective sleeve is required to have strong anti ultraviolet ability, so as to prolong the service life of the protective sleeve.

Eighth, antistatic. With the continuous development of science and technology, various high-end and precision instruments and equipment have been introduced one after another. Some electrical equipment have strict requirements for the working environment, and even require to eliminate the generation of static electricity and magnetic field. This kind of rubber protective sleeve can undoubtedly bring maximum effective protection. When purchasing these products with special functions, it must be required to do field testing. Seeing is believing.

The above is the personal experience of engineer Wei on how to buy rubber protective covers. As an old expert who has been struggling in the industry for more than 30 years, I hope these tips of engineer Wei can help you buy genuine products.