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Rubber hose

Tubular rubber for conveying gas, liquid, slurry or granule

A kind of tube used to transport gas, liquid, slurry or granular materials Rubber products 。 By the inner and outer glue layer and skeleton The framework layer can be made of cotton fiber, various synthetic fibers, carbon fiber or asbestos, steel wire, etc. The internal and external rubber layers of general rubber hoses are made of Natural rubber 、 butadiene styrene rubber or Cis-1,4-polybutadiene rubber ； Oil resistant hose Neoprene 、 Nitrile rubber ； Acid and alkali resistant, high temperature resistant hose EPDM , fluororubber or silicone rubber, etc.

Chinese name: Rubber hose
Foreign name: hose

Meaning: Metal hose, rubber hose
Naming: The unified naming method is material and structure
Material: Natural rubber

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meaning

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Rubber hose

Rubber hose , compared with the hose, it focuses on the use of polymer chemical materials vulcanization Extruded by equal process Rubber hose 。 The hose includes a wider range of Metal hose 、 corrugated pipe 、 Hydraulic hose, etc 。

Nomenclature of rubber hose

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There are many kinds of rubber hoses. The unified naming method is different in material, structure and use. The full name of the product is: material+structure (process)+use+rubber hose. For example: cotton thread woven oil resistant hose; Steel wire wound pressure hose.

structure

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The hose structure is generally divided into: inner rubber layer, outer rubber layer and skeleton layer (or intermediate layer). The inner rubber layer directly bears the abrasion and erosion of the conveying medium; The outer rubber layer protects the inner part of the hose from the damage and erosion of the external environment; The skeleton layer is the pressure bearing layer of the rubber hose, which endows the pipe body with strength and rigidity. The working pressure of the hose depends on the material and structure of the skeleton layer.

Full rubber hose

According to the different skeleton layers, the common rubber hoses are:

Full rubber hose (no fabric material)

Cloth clamping hose (The skeleton layer is cloth layer)

Cloth clamping hose

Suction hose (there is a layer of metal outside the cloth layer helical line , suitable for operation under negative pressure)

Braided hose (the skeleton layer is woven steel wire or fabric)

Suction hose

Winding rubber hose (the skeleton layer is the winding layer of steel wire or wire rope, and the bearing capacity is usually 80~600MPa or higher)

Knitted hose (the skeleton layer is knitted fabric)

Short fibre Rubber hose (short fiber and rubber Blending Pressed)

texture of material

Common materials used for the inner and outer rubber layers of rubber hoses are: PVC polyvinyl chloride 、 PUR Polyurethane 、 NR Natural rubber SBR oil filling butadiene styrene rubber 、 EPDM EPDM 、NBR acrylonitrile butadiene copolymer /Nitrile, CR neoprene/rubber, SI silicon rubber 、 UPE / XLPE cross-linked polyethylene UPE ultra high molecular polyethylene, etc.

purpose

Food production grade hose

Rubber hoses have been used in many fields of life and production. The common pipes include: water pipes, hot water pipes, steam pipes, marine pipes, food and beverage pipes, air pipes, welding pipes, gas pipes, ventilation pipes, material pipes, oil pipes, chemical pipes, high-pressure pipes, etc.

Forming process

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The basic process of hose production is Rubber mixture Processing the cord fabric and canvas Processing, rubber tube forming vulcanization Etc. The processing method of the skeleton layer and the forming equipment of the rubber hose with different structures and different skeletons are different.

Since the full rubber hose does not contain a skeleton layer, it is only necessary to use a press out machine to press out the hose; Cloth clamping hose It is necessary to use a molding machine to wrap the adhesive tape on the inner adhesive layer; The suction hose shall be wrapped with metal before forming helical line Inner glue of rear package; Special fabric knitting machine or Winding machine ； Knitting machine is required for knitting hose.

The forming method of rubber hose mainly depends on whether the tube core is used, which can be divided into coreless method, and cored method (including soft core method and hard core method).

Coreless molding

Sectional drawing of screw extruder components

Coreless forming of rubber hose, the equipment is Extrusion molding machine (Common screw Extruder ）The skeleton layer and the outer rubber layer are directly formed on the pressed inner rubber tube.

The rubber material is stirred, mixed, plasticized and compacted in the barrel with the help of the placement of the extrusion screw, and then moves towards the die. Finally, the product with a certain shape is extruded from the die, Screw extruder There are two kinds of hot feed and cold feed. The former is fed through the open type Rubber mixing machine Preheated strip, the latter feeds rubber without heat refining.

Cored molding

The rubber hose is formed with a core, which means that the rubber hose is formed on the hard core or soft core to ensure that the rubber hose is vulcanization During the process, the rubber hose is under pressure. After forming, it is wrapped with water cloth (about 10cm wide wet cloth roll), rope or lead, and then vulcanized.

Vulcanization can be used Vulcanization tank Direct steam heating or continuous vulcanization. The short fiber rubber hose is to add the short fiber directly into the rubber material, and then press out to form. Its production process is simple, and it will gradually replace the knitting rubber hose and Cloth clamping hose 。 Modern hose production process tends to be highly continuous and automated. use Thermoplastic rubber Or plastic can save the vulcanization process and greatly simplify the production process.

Rubber hose classification

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Chemical hose

Rubber hose

Multi functional chemical hose It means that it has good corrosion resistance to strong solvents and strong acid and alkali media, and can be used to transport benzene[ toluene 、 xylene ]Ketone [butanone acetone , cyclohexanone] ester [butyl ester, ethyl ester], alcohol, aldehyde, hydrocarbon, acid, alkali, chlorinated hydrocarbon, etc. The solvent hose is widely used for conveying and unloading coatings, dyes, inks, paints, chemical additives and benzene and ketone organic solvents in the production process of the chemical, paint, coatings and ink industries; Storage and transportation of various solvents, acid-base and other highly corrosive chemicals in filling trucks, barges, docks or storage tanks in the chemical industry; In the printing and packaging industry, ink (oily ink and Water-based ink ）。

hydraulic hose

Rubber hose

Purpose: It is used for conveying high-pressure liquid and hydraulic transmission in various engineering buildings, transportation, injection molding, agricultural machinery, metallurgy=forging, mining equipment, ships, machine tools, and first-class mechanized and automatic systems. For general futures instruments hydraulic hose It is mainly used on various manual and electric hydraulic jacks or similar tools as a source of pressure transmission. The applicable media are hydraulic oil, fuel oil, lubricating oil grade I water, air and water-based liquid (except castor oil and grease based liquid). The medium temperature is - 40 ℃ -+100 ℃ for oil, - 30 ℃ -+50 ℃ for air, and below+80 ℃ for water emulsion.

High pressure hose

coal industry

Oil pipes for coal industry mainly include hydraulic support Rubber hose. The pressure requirements of some coal mine hydraulic supports have been improved, some Steel wire braided hose Unable to meet its performance requirements, it is required to use steel wire winding tubing instead. In addition, in order to prevent coal dust pollution during underground coal mining and improve production safety, the variety of oil pipes used in coal mines has been increased, such as the expansion oil pipe of the coal seam water probe hole sealer, which is used for water injection, grouting and other operations on the coal seam before the comprehensive mining of the coal mine underground working face. It is reported that it has been produced by domestic manufacturers and tested by more than a dozen coal mines, which can replace similar imported products.

petroleum industry

twenty-first century CNOOC In the development strategy, it is proposed to focus on the development of offshore and shallow oil fields. Therefore, in addition to the use of drilling tubing and vibrating tubing, the petroleum industry also requires the use of shallow oil pipelines. Shallow sea subsea oil pipelines have been produced domestically, but floating or semi floating oil pipelines and deep sea subsea oil pipelines still rely on imports. With the implementation of China's offshore oil development strategy, the requirements of offshore oil exploitation on tubing performance will continue to improve.

Metallurgical industry

The equipment used in the production of iron and steel includes continuous casting equipment, which is divided into electric furnace converter and hot furnace converter. The requirement for rubber hose is that it must be armored, which is used for temperature insulation, cooling and burning resistance. During the use of oil pump and pump station, in addition to meeting the requirements for qualified pressure, it is required to meet the requirements for aging resistance.

Farmland water conservancy

The No. 1 document of the 12th Five Year Plan put forward the water conservancy proposal and passed it, and invested one trillion yuan in reform. In the process of water delivery, especially under negative pressure High pressure hose It can show its own advantages, long service life and convenient carrying.

call	Inner diameter (mm)	Performance and use	remarks
Temperature resistant steam hose	6-76	Conveying 200. Saturated steam or superheated water below C, working pressure of steam 0.35MPa, hot water 0.8MPa	-
Oil resistant hose	6-152	Suction and delivery of gasoline, engine oil, lubricating oil and other mineral oil under normal temperature. The working pressure is 0.5-1.2MPa	External armored structure can also be used
Hygienic food hose	16-152	Attract milk, alcohol, edible oil and liquid drinks. The working pressure is 0.5-0.8MPa	-
Acid and alkali resistant hose	19-203	Transport dilute acid and alkali solutions at normal temperature. The working pressure is 0.5-0.7MPa	When transporting concentrated acid, butyl rubber can be used as the inner rubber layer, and glass fiber can be used as the cloth layer
High wear-resistant sandblasting hose	19-76	Hose for air pressure sand blasting, working pressure 0.6MPa	Pipes for cement tanker can also be produced according to this
Water tank elbow	25-102	For water conveyance of locomotive water tank	-
Oil drilling hose	51-102	It is pressure resistant, wear-resistant and oil resistant, and is used as the flexible connecting pipe between the hose faucet of the drilling rig and the riser flange. The working pressure is 10-30MPa	Metal joints at both ends
High pressure cord winding oxygen blowing hose	51-127	Flexible connecting pipe for pure oxygen top blown converter, with working pressure of 1.5MPa, steel wire textile buckle pressure type can also be used, and the working pressure can reach 8MPa	Vulcanized metal flanges at both ends, with asbestos protective layer outside
Large diameter mud discharge and suction hose	102-1300	The dredger is used to discharge (absorb) sediment, and the working pressure is 0.4-0.5MPa	Flange joint can be provided according to design requirements

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