Metal hose is an important connecting component in engineering technology, which is formed by the combination of corrugated flexible pipe, net sleeve and joint. In all kinds of gas and liquid pipeline system, length, temperature, position and angle compensation system as the compensation element, a sealing element and connecting element and damping element, used in various fields of aerospace, petrochemical, electronics, shipbuilding, mining machinery, textile, medical electronic energy construction etc.. The latest national specification for metal hoses is the general technical conditions for corrugated metal hoses (GB/T14525-2010), which was implemented in October 1, 2011.
1. Wire protective tubes for armoured cable, precision optical ruler, optical measuring instrument, medical instrument and machine equipment.
2, for the public telephone, remote meter, magnetic door alarm other need security protection for wire equipment;
3. Protective tubes of various fine wires;
4, all kinds of computer, robot and so on network line protection pipe.
5, the outer layer protection film of the solar energy equipment PVC.
The metal hose can be compressed and stretchable, but if it is not installed in the correct position, it will break quickly and even reduce the service life. The metal hose can be installed horizontally and can be installed vertically or slanted. The ideal condition is the vertical installation, and it should be avoided near the wheel, and the baffle can be installed when necessary.
General can be divided into 3 kinds of metal hose length: first compression length, which is compressed to the limit position of the hose length; the second is to install length, which is in the middle position of the half length of the hose of the maximum displacement; third is the stretched length of the hose is stretched to the maximum when the length of.
When the hose is installed, the hose should be in the middle position, that is, the so-called installation length. When installed in this position, there will be 2 moving directions when the hose is subjected to axial load. Otherwise, if it moves in 1 directions, it will affect the strength and reduce the service life of the metal hose.
Precautions for the use of metal hoses
Metal hose can not be towed on the sharp or rough surface, not to suffer hammer, knife, variant, vehicle rolling. Transportation of heavier straight tubes, especially when lifting, should be taken properly.
2. seal test
After the metal joint is installed, the hydraulic test should be carried out (the test pressure follows the corresponding data) to ensure that the metal joint and hose are not leaking and loose. If there are no existing standard test specifications, the pressure test should comply with the data provided by the hose manufacturer.
3. electrostatic release
The installation of a hose with a release of electrostatic functions should be specified in compliance with the manufacturer's specification. After the metal interface is installed, the corresponding test is required. If the hose can only withstand low resistance, a path tester test or an insulation controller can be used.
4. fixed device
Safety measures should be taken in the hose on the fixtures. Safety measures can not affect the normal deformation of the hose stress, including (length, diameter, bending, etc.). If the hose is subject to special mechanical force, pressure, negative pressure or geometric deformation, please consult the manufacturer.
5. active component
The hose installed on the moving part should ensure that the hose will not be impacted, blocked, worn or abnormally bent, folded, dragged or twisted due to the movement.
6. reference information
In addition to the label, if you want to add reference information on the hose, you should choose the appropriate tape. In addition, paint and paint can not be used. The protective film of the outer layer of the hose will have a chemical effect on the paint solution.
The hose should always be maintained in accordance with the regulations to ensure the performance of the hose. Attention should be paid to some specific phenomena of metal joints and reaction hoses polluted, such as normal aging, improper use and erosion. Special attention should be paid to the occurrence of the following phenomena: - cracks, scratches, breakages, disconnections, etc. will lead to the exposure of the internal structure.
In case of the above conditions, the metal hose should be replaced. In certain specific use environments, expiry dates are required to ensure the safety of use. The date is marked on the hose, and the hose should not be exhausted immediately and should be stopped immediately.
Usually it is not recommended to repair the hose. If the special situation is to be repaired, it is necessary to strictly comply with the repair opinion of the student. The pressure test is required after the repair is finished. If one end of the hose is contaminated by the incision, the rest of the hose still meets the requirements of the food production, and the contaminated part can be removed to complete the repair.