What Are the Different Types of Hose Products?

Metal hoses are an important component in modern industrial equipment connection lines. Metal hoses are used for wires, cables, wire and cable protection tubes for automation instrument signals, and civilian shower hoses with specifications from 3mm to 150mm. Small-caliber metal hose (inner diameter 3mm-25mm) is mainly used for the protection of the sensor line and industrial sensor line protection of precision optical rulers.

At first, people used animal skins to synthesize tubular structures to meet the needs of the production struggle. After a long period of time, by the end of the seventeenth century, the brothers of the Dutch Van Der Gekin made longitudinally stitched canvas hoses, which were widely used in the fire protection business of the time. Later, with the emergence of rubber in the international market and the development of its vulcanization process, hoses and hoses armored with fabrics such as metal wires or hemp ropes came out. However, some high-temperature media such as steam and hot air are used in engineering '

Installation stress of the pipeline

In the complicated pipeline system, there are often various difficulties in installation due to the limitation of the spatial location conditions: the formed pipe cannot be fitted; the bent, straight forward, and fitting together the installed pipe will inevitably produce partial Cold correction. Depending on the diameter of the pipe and the specific conditions of the site, the amount of cold correction can range from a few millimeters to tens of millimeters, and sometimes up to several hundred millimeters. Practice has proved that the larger the amount, the higher the internal stress. These installation stresses in the pipeline system are undoubtedly extremely hidden.

A section of the bearing lubricating oil pipe in a certain type of engine suffered multiple fracture accidents in actual operation due to excessive installation stress.

Because it can be bent at will and the internal stress generated by bending at the rated bending radius is extremely small, it can bring great convenience to the installation work and also play a certain role in ensuring the safe operation of the piping system. This is the main reason that metal hoses must be used in some piping systems.

Compensating the position of the pipeline

Due to the need for loading and unloading the mold, the movable cylinder on the vulcanizer will move upward and downward. After the copper serpentine pipe reciprocates for many times, fatigue fracture will occur. Although it can still be used after repairing, parking repair will cause time loss. Although the rubber tube has good soft characteristics and strong anti-fatigue ability, it is also a weak link in terms of pressure resistance, temperature resistance, and anti-aging. Generally, it cannot be continued after several months of use. The good comprehensive performance of metal hoses is fully reflected here. In the general industrial field, in addition to pressure and temperature, there are often harsh conditions such as fatigue, corrosion, vibration, compression, and shock. Under such circumstances, it is most suitable to compensate the position of the pipeline. Yes.

Metal hose consists of three parts: bellows, mesh sleeve and joint. The bellows is the body of the metal hose, which plays a flexible role; the mesh sleeve plays a role of strengthening and shielding; the joint plays a role of connection. For different use requirements, they are connected in different ways: the bellows, the net sleeve and the joint are connected in a welded form, called a welded type; connected in a mechanical clamped form, called a mechanical clamped type, In addition, there is also a combination of the above two methods, called hybrid.

Metal hose products include oil suction hoses, steam hoses, sandblasting hoses, acid and alkali suction hoses, food hoses, oxygen blowing hoses, and various special-shaped hoses. Widely used in machinery, chemical, petroleum, metallurgy, food and other industries.

What is the pressure range of the pressure-resistant metal hose: The pressure range of the hose is generally PN0.6-32.0Mpa. Up to 42.0MPa. The metal hose is the main pressure-receiving part of the hose installed in the pressure pipeline, and it also acts as a sheath for the corrugated pipe. Depending on the pressure in the pipeline and the application site, one or more layers of stainless steel wire or steel strip can be selected. Weaving. ^[1]

Because the main parts of the hose are made of austenitic stainless steel, the excellent temperature resistance and corrosion resistance of the hose are guaranteed. The working temperature range of the hose is extremely wide, which is -196-600 Select the appropriate stainless steel grade according to the corrosiveness of the medium passing through the pipeline, and the corrosion resistance of the hose can be guaranteed.

1. The metal hose is made of 1Cr18Ni9Ti stainless steel as a whole, which has strong corrosion resistance.

2. The hose body is a thin-walled stainless steel pipe body formed by hydroforming, which has strong flexibility, stretchability, strong bending and vibration resistance, and enhanced protection of the braided mesh sleeve, so that it has higher pressure capacity.

3 The connection at both ends of the hose can also be made in other ways than the thread and flange standards for easy connection and use.

Although metal hoses can be compressed and stretched, if they are not installed in the correct position, they will break quickly and reduce the service life.

The hose can be installed horizontally, vertically or obliquely. The ideal state is vertical installation. At the same time, it should be avoided to install near the wheels. If necessary, a baffle can be installed.

Generally, metal hoses can be divided into three types: the first is the compression length, that is, the length when the hose is compressed to the extreme position; the second is the installation length, which is at the middle position of half of the maximum displacement The length of the hose; the third is the stretch length, the length when the hose is stretched to the maximum limit.

The hose should be installed in the middle position, the so-called installation length. When installed in this position, the hose can move in two directions when subjected to axial load, otherwise if it can only move in one direction, it will affect the strength of the metal hose and reduce its service life.

In the actual installation process, taking into account the calculation of the length of the hose with a ruler and then installing it may affect production efficiency, some foreign manufacturers install the ruler directly on the hose and cut the ruler after installation.

1. When selecting metal hoses, please use metal hoses with loose flanges as far as possible for easy installation.

2. The surface of the metal hose should be protected during welding operations at the construction site to prevent welding slag and arc ignition from burning the metal hose.

3. It is strictly forbidden to twist the metal hose.

4. It should not bend along the root of the metal hose, and there should be no dead bend.

5. The medium passed must not be corrosive to the corrugated pipe material, and the chloride ion content in the medium should be 25PPM

6. Strict installation diagram: Install in the correct way. (See installation guide)

7. Mechanical damage to the flange sealing surface is strictly prohibited. ^[2]

First, production costs have risen too fast, raw materials have generally risen, labor costs have risen too fast, and the problems of labor shortage and labor shortage are very prominent. The wages of employees in the Yangtze River Delta, Pearl River Delta and other coastal areas have generally risen. The above two "costs rise too fast" squeezed the profit margin of metal hose companies.

Application of metal hose products: used to protect various equipment signal lines, transmission wires and cables, and fiber optic cables.

1. Armored optical cables, precision optical rulers, optical measuring instruments, medical instruments, wire protection tubes for machinery and equipment;

2.Applicable to public

China is a large country in the production and export of metal hoses. Most of the metal hoses sold worldwide are produced and exported from China. China has become the world's major supplier of metal hoses. Although China's metal hose industry has a large scale, due to weak technological innovation capabilities, too single market structure, and weak brand influence, many metal hose manufacturers often lack core competitiveness, making it difficult to grow larger and stronger.

Sales of stainless steel hoses were 14.5 billion yuan, of which threaded stainless steel hoses accounted for less than 25%, which was not only far from the international market hose product structure, but also failed to meet the growing demand for stainless steel hoses in the domestic manufacturing industry.

In 2010, the imbalance in the structure of metal hoses meant that the produced hoses did not meet the demand. For example, the gaps in fiber protection hoses required by users are very large, but galvanized metal hoses are over-produced; the double-stainless stainless steel hoses urgently needed by modern manufacturing are very large, but low-grade single-stainless stainless steel hoses are over-produced. ^[4]