***Embedded casing (threaded spike casing, plastic casing, nylon casing Insulating sleeve ） 
1、 What is nylon
Nylon is the outstanding American scientist Carlos (Carothers) The first kind of synthetic fiber appeared in the world was developed by a scientific research team under his leadership. The appearance of nylon makes textiles take on a new look. Its synthesis is a major breakthrough in synthetic fiber industry and an important milestone in polymer chemistry.
Nylon（ Nylon ）, English name Polyamide (short for PA ）, the main chain of the molecule contains repeated amide groups —[NHCO]— Of Thermoplastic resin General. Including aliphatic group PA , Fat — Aromatic group PA And aromatics PA 。 Among them, aliphatic PA It has many varieties, large output and wide application. Its name depends on the specific carbon atom number of the synthetic monomer.
one thousand nine hundred and thirty-eight year ten month twenty-seven It was officially announced that the first kind of synthetic fiber was born in the world, and polyamide sixty-six This synthetic fiber is named nylon (Nylon) 。
Nylon has many characteristics, so it is widely used in automobile, electrical equipment, mechanical parts, transportation equipment, textile, paper making machinery, etc. With the miniaturization of automobiles, the high performance of electronic and electrical equipment mechanical equipment The process of lightweight is accelerated, and the demand for nylon will be higher and greater. In particular, as a structural material, nylon has high requirements on its strength, heat resistance and cold resistance. The inherent disadvantages of nylon are also important factors limiting its application, especially for PA6 、 PA66 For the two varieties PA46 、 PAl2 It has a strong price advantage over other products, although some properties cannot meet the requirements of the development of related industries. Therefore, we must aim at a certain application field, improve some of its performance through modification to expand its application field. because PA Extremely strong, strong hygroscopicity, poor dimensional stability, but can be improved by modification.
2、 Classification of nylon
one Glass fiber reinforced PA: stay PA join 30% Glass fiber, PA The mechanical properties, dimensional stability, heat resistance and aging resistance of nylon , The strength is not enhanced two point five times 。
two , flame retardant PA: Because on PA The flame retardant is added in the. Most of the flame retardants are easy to decompose at high temperatures, releasing acidic substances, which have a corrosive effect on metals. Therefore, the plasticizing elements (screw, rubber head, rubber ring, rubber washer, flange, etc.) need to be plated with hard chrome. In terms of technology, try to control the temperature of the machine barrel not to be too high and the injection speed not to be too fast, so as to avoid the discoloration of products and the decline of mechanical properties caused by the decomposition of the rubber material due to the high temperature.
three , transparent PA: It has good tensile strength, impact strength, rigidity, abrasion resistance, chemical resistance, surface hardness and other properties, high light transmittance, similar to optical glass, and processing temperature of 300--315 The temperature of the barrel shall be strictly controlled during the molding process. If the melt temperature is too high, the product will change color due to degradation, and if the temperature is too low, the transparency of the product will be affected due to poor plasticization.
four Wear resistance PA: stay PA Carbon black and other ultraviolet absorbing additives are added into the PA The self lubrication and wear of metal are greatly enhanced, which will affect blanking and wear parts during forming. Therefore, the combination of screw, barrel, rubber head, rubber ring and rubber washer with strong feeding capacity and high wear resistance is required.
five Nano nylon : According to the news from Toray Chemical Company, the company has successfully developed a new technology of "nanofiber" with a nanometer scale monofilament structure whose diameter is two digits smaller than that of the previous ultra-fine fibers, and reached the limit of fiber fineness by controlling the nano structure technology. Dongli Chemical said that the company has developed a diameter of ten μ m Monofilament one hundred and forty Nano nylon fiber composed of more than 10000 pieces. Compared with previous products, the surface area of this fiber is one thousand About times, with high surface activity 。
six Super strong nylon fiber : Triangle–Raleigh Nylon fiber has many uses, from clothing, carpets to ropes to data lines of microcomputers.
seven , cast nylon : Cast nylon（ MC Nylon), also known as monomer casting nylon, is a kind of nylon that uses caprolactam monomer in strong alkali (such as NaoH ）Under the action of some cocatalysts, the rough parts of the products are directly polymerized and molded by the mold. Because the polymerization and molding process are combined, the molding is convenient, the equipment investment is small, and it is easy to manufacture large machine parts. Its mechanical properties and physical new energy are better than nylon six High. It can produce dozens of kilograms of gears, turbines, bearings, etc.
eight , Nylon 1010: It is a kind of engineering plastic created by our country. It is made from castor oil, extracted from sebacic diamine and sebacic acid, and then condensed. Low cost, good economic effect, very good self-lubricating and wear resistance, good oil resistance, low brittle transition temperature (about -60 ℃), high mechanical strength, widely used in mechanical parts, chemical and electrical parts .
nine , aromatic nylon : Aromatic nylon, also called polyaromamide, is twenty century sixty In the s, DuPont first developed a new type of nylon with high temperature resistance, radiation resistance and corrosion resistance. All nylon molecules containing aromatic ring structure belong to aromatic nylon.
ten 、 MXD6 : Yes Lum Et al twenty century fifty A crystalline nylon resin was synthesized from m-phenylenedimethylamine and adipic acid by polycondensation in the s. In industry, MXD6 It is mainly used as packaging materials and engineering structural materials instead of metal. The former includes food and beverage packaging, instrument and equipment packaging (damp proof, vibration damping cushion and foam materials); The latter includes high heat resistance grade Reny 、 MXD6/PPO Alloy and anti vibration level of Reny Etc. besides, MXD6 It is also used in magnetic plastics, transparent adhesives, etc.
3、 Nylon resin pipe
Nylon resin pipe refers to the high pressure hose formed by weaving or winding high degree industrial fiber or steel wire with nylon material extruded hose as the inner core. The hose should belong to the theoretical category of hydraulic resin pipe. As a new generation of hydraulic hose, nylon resin hose has quite good advantages over traditional rubber hose. First, the oil resistance of nylon resin pipe is higher than that of rubber pipe five Times more. Compared with rubber pipes of the same specification, nylon resin pipes have higher pressure bearing capacity and lower pipe weight. The appearance of nylon resin pipe is generally made of high-quality polyurethane elastomer material, and its wear resistance is higher than that of rubber pipe three Times, known as the wear-resistant king. Nylon resin pipe has better chemical resistance and corrosion resistance. Nylon resin pipe is an environment-friendly high performance hose. Whether processing or application, its reliable and environmentally friendly performance is favored by users. The inner wall of nylon resin pipe is as smooth as a mirror, which neither pollutes the medium nor is it polluted by the medium; Less power transmission loss and higher efficiency. Of course, nylon resin pipe also has its insurmountable defects at present, that is, the bending radius is large, and the flexibility is not as good as traditional rubber pipe; However, this shortcoming has been overcome by newer hydraulic resin pipe products.
4、 * * * Embedded casing
Features: high-quality nylon sixty-six It is a basic resin, which is blended and granulated by adding a variety of modifiers. It has good mechanical strength, heat resistance, wear resistance, high rigidity and good pull-out resistance. Purpose: * * * special sleeper sleeve.
Technical requirements:
performance Properties | Company Units | test method Test methods | TEP-DBZ730 |
density Density | g/cm | GB1033 | one point one four |
tensile strength Tensile strength | MPa | GB1040 | ≥ fifty-five |
elongation Elongation | % | GB1040 | ≥ seventy |
bending strength Flexural strength | MPa | GB1042 | ≥ sixty-five |
Bending modulus Flexural modulus | MPa | GB1042 | ≥ two thousand |
Notch impact strength Notched Impact Strength | twenty ℃ | KJ/m | GB1043 | ≥ twenty-five |
-50 ℃ | KJ/m | GB1043 | ≥ fifteen |
hardness Hardness | R | GB9342 | ≥ ninety-five |
Water absorption Absorptivity | % | GB1034 | ≤ one point three |
5、 * * * Function and performance of embedded casing
The embedded sleeve is a plastic sleeve with good mechanical strength, heat resistance, wear resistance and high rigidity embedded in the fixing hole of the track nail of the sleeper. It has the advantages of simple and convenient construction, long service life, etc., can improve the durability, insulation, environmental protection level and comprehensive technical and economic indicators of sleepers, and meet the requirements of high-speed development of * * *.
6、 * * * Embedded casing material and use
Nylon casing is made of glass fiber reinforced nylon composite by injection molding process, with internal and external threads .
A : The internal thread matched with the spike is a serrated single bevel thread, the bevel of the thread is a large bevel angle, and the matching between the nylon sleeve and the spike is a loose fit, so that the stress condition of the plastic sleeve and its components is better, thus greatly extending the service life of the nylon sleeve and its components;
B : The external thread combined with the concrete sleeper is the thread slot with the same pitch as the internal thread. According to different road conditions, full thread or half thread can be selected. At the same time, a transverse boss is added at the upper and lower ends of the casing, and an insertion hole is set in the boss to facilitate the insertion of reinforcement during embedding, which improves the pulling resistance of the casing to the sleeper. It can be widely used in engineering projects related to concrete, such as * * *, roads, bridges, houses, etc. It is especially suitable for * * * sleepers. Embedded in concrete turnout sleepers can improve train speed and turnout crossing speed.
7、 Technical conditions for installation of sleeve for concrete turnout
1、 During transportation, loading, unloading and stacking of turnout sleepers, the bolts shall be screwed into the casing, or the pipe orifice can be sealed with a wooden plug to prevent sundries falling into the casing.
2、 Before the fastener assembly, the surface of the concrete turnout sleeper shall be cleaned. The inside of the sleeve shall be clean and free of sundries. The bottom of the sleeve shall not be blocked by sundries or mud. The sleeve shall be coated with grease to prevent the bolt from rusting.
3、 During the assembly of fasteners, some unsuitable accessories shall be polished and repaired, and hammering is not allowed to avoid damaging accessories or sleeves.
4、 During fastener assembly, the bolt torque shall be controlled within two hundred and fifty ～ 300N · m 。
5、 When assembling fasteners, it is not allowed to use a force bar or other tools to assemble them, so as to avoid the acceleration force exceeding the larger bearing force of the nylon sleeve, and to damage the sleeve, a torque wrench must be used for assembly.
8、 * * * Embedded Casing production Manufacturer Profile
The * * * nylon casing production of Kunshan Alexis attaches great importance to quality control and management. Our company mainly produces and sells * * * embedded sleeves made of nylon PA66 And plastic HDPE 。 Our * * * nylon casing production is completely in accordance with ISO9001-2008 We have also obtained the production license of * * * products from the * * * Department of China. We have a full set of testing equipment to ensure that all our * * * nylon casing products meet the quality requirements of customers.
As a production and sales enterprise in China's * * * equipment and * * * accessories industry, Kunshan Alexis Precision Machinery Co., Ltd. also supplies rail fastening systems, threaded studs, hooked studs, rail bolts T T-bolt, tunnel connection segment bolt, fishtail bolt, spring bar, gusset plate, spring plate, fishtail plate, iron backing plate, anticreeper, embedded iron seat, nylon gauge block, embedded sleeve, rubber backing plate, turnout, rail, steel sleeper, train brake shoe, etc. We will make efforts to make China's high-speed railway go global!!! Let the whole world enjoy the comfort, convenience and quality services brought to them by the cause of Chinese Communist Party.
9、 Embedded casing production workshop
10、 Embedded casing detection
11、 Packaging and delivery of embedded sleeves
12、 Embedded Casing application
thirteen Introduction to embedded casing manufacturing factory
