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The waterproof cable
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Waterproof cable, as the name suggests, the outer skin and filling of the cable are made of waterproof rubber, and the sheath of the cable is also made of waterproof rubber sheath. Generally, waterproof cables are suitable for submersible pumps, coal mines, underwater operations, underwater landscape lights and other water treatment equipment. So what are the specific types of waterproof cables and what are their characteristics? Let's have a look.
1、 Ethylene propylene rubber insulated waterproof cable
Due to the superior insulation performance without "water tree" phenomenon, ethylene propylene rubber insulated cables are widely used in medium and low voltage underwater transmission lines. For example, waterproof rubber sheathed cable (JHS type) can operate safely in shallow water for a long time.
2、 XLPE insulated waterproof cable
Because the cross-linked polyethylene material is particularly sensitive to water, if the insulation is soaked with water during manufacturing and operation, it is prone to "water tree" breakdown, which greatly shortens the service life of the cable. Therefore, XLPE insulated cables, especially medium and high voltage cables under AC voltage, must have "water blocking structure" when used in water environment or humid environment. The so-called "water blocking structure" includes radial water blocking structure and longitudinal water blocking structure.
Longitudinal water blocking
Longitudinal water blocking commonly used are water blocking yarn, water blocking powder and water blocking belt. Their water blocking mechanism is that these materials contain a water expandable material. When water enters from the cable end or sheath defects, this material will expand rapidly in case of water to prevent further diffusion of water along the longitudinal direction of the cable, so as to achieve the purpose of longitudinal waterproof of the cable.
Radial water blocking
Radial water resistance is mainly realized by squeezing HDPE non-metallic sheath or hot pressing, welding and cold drawing metal sheath.
The Causes of oxidation blackening of copper conductors
Several causes of oxidation blackening of wires and cables that are most likely to be ignored:
1. Improper handling of cable joints
The sealing of the cable joint is not well packaged, resulting in air intrusion into the copper conductor and blackening. When packaging the cable head, most masters will directly seal it with insulating tape. In fact, the insulating tape is not waterproof, and there is a layer of glue on it, which will also make the cable blacken over time.
2. Damp insulation
This situation is also very common, which usually occurs at the cable joint. If the cable joint is not qualified or made under humid climate conditions, the joint will be filled with water or mixed with water vapor, and the cable will blacken over time.
3. Construction and installation
Some users do not conduct standardized construction when laying and installing cables, which is easy to cause mechanical damage; If the copper conductor of the cable is partially damaged, it will be oxidized and blackened if it is damp underground or exposed for a long time.
Rifeng XLPE insulated power cable
Cross-linked polyethylene insulated power cable, so the name suggests, its insulating medium material uses cross-linked polyethylene. Cross-linked polyethylene material is that after the steam cross-linked polyethylene, its molecular structure is transformed into a three-dimensional network structure, which turns the thermoplastic polyethylene into a thermosetting cross-linked polyethylene, which greatly improves the heat resistance and mechanical properties of the material , And maintains excellent electrical performance. The relevant parameters of the XLPE insulated power cable are as follows:
01 Product Usage
It is suitable for power transmission and distribution in urban power grids, mines and factories with rated voltage of 6-35KV.
02 Product Standards
It is produced in accordance with the GB/T12706-2008 standard equivalent to the IEC60502-2004 standard.
03 Product Features
(1) When the cable is laid under the condition that the ambient temperature is not lower than 0℃, there is no need to pre-heat it. The cable laying drop is not restricted.
(2) The maximum rated temperature of the cable conductor is 90℃;
(3) When the core is short-circuited (the longest lasting 5S), the temperature shall not exceed 250℃.
(4) The minimum bending radius during cable laying is specified as follows:
Single core cable: 20(d+D)±5%;
Three-core cable: 15(d+D)±5%.
Where: D is the actual outer diameter of the cable, and d is the actual outer diameter of the conductor.
ocean exploration cables
In modern times, ocean exploration has become a worldwide hot technology. For this reason, multi-disciplinary ocean detection systems and detection technologies have been developed. All detection systems and detection technologies are inseparable from the carrier of power and signals-ocean detection cables.
Product Features
1. Comprehensive
For ocean exploration cables, it is often a cable that not only reliably provides power to ocean exploration equipment, but also accurately transmits the acousto-optic signals collected and processed by the detection instrument. Therefore, it is necessary to collect power lines, high and low frequency logic, analog and digital signals. The wire and the reinforcing element are integrated, and the photoelectric composite is made into a multi-wire group and a multi-functional comprehensive cable.
2. Electromagnetic compatibility
In order to eliminate the mutual interference of strong and weak current, high and low frequency signals, the structure of ocean exploration cables must be carefully designed, and the cores or groups of wires must be reasonably laid out. According to relevant standards, they must meet the requirements of electromagnetic compatibility.
3. Water tightness
Ocean exploration cables work in the ocean for a long time, and with different water depths, they bear different water pressures. Therefore, waterproofing is an important feature of cables. Not only must have horizontal and vertical watertightness, as well as their connectors or branch cables, they must be carefully sealed.
4. High strength and long length
Ocean exploration cables are in a special marine environment. They not only have to withstand the impact of waves and ocean currents, but also take on the task of retracting and towing the detection equipment. Most of them require high strength, especially high tensile strength and wear resistance.
5. Predetermined buoyancy
According to the different purposes used on the sea, underwater and seabed, ocean exploration cables are often manufactured into cables with predetermined buoyancy such as floating, waiting to float, and sinking to the bottom.
6. Resistant to chemical corrosion and biological attack
Ocean exploration cables must be resistant to salt spray, seawater corrosion, mold, rodent bites, and marine animals.
Guangdong Rifeng Cable Co. Ltd.-product certification
Started in 2009, Guangdong Rifeng Cable Co. Ltd. is specialized in research and development, design, manufacturing and sales of rubber-sheathed cables as core products. Its products have been used widely in air conditioning, home appliances, wind power generation, new energy, high-end equipment manufacturing, building machinery, port machinery, petrochemical industry, marine engineering, vehicles and vessels, robot and power-driven tools. Rifeng currently has facilities of more than 200,000 sq. meters . It has more than 30 patents granted by the state and been successfully listed at Shenzhen Stock Exchange under the code 002953 on May 9th, 2019.
Rifeng Enterprise has passed ISO9001:2015 Quality Management System Certification, ISO14001:2015 Environmental Management System Certification, IATF16949:2016 Quality Management System Certification.
Rifeng’sproducts have passed China CCC, France NF, UK ASTA, UK BSI, German VDE, German TUV, EU CE, EU CPR, US UL, US ETL, US MSHA, Canadian CSA, Australia SAI &SAA, Korea KTL, Japan JQA &PSE, Saudi SASO, Brazil INMETRO, India BIS, BV Classification Society, CCS Classification Society, India ISI, China National Industrial Products Production License and product certificationsof the other countries and regions.
For more details about this listing please click here to access the webpage provided by listing owner.
Environmentally friendly cables will be the trend of the cable industry
With the development of world economy and technology, the demand for wires and cables is increasing, and their performance requirements are also increasing. Under the new economic situation and technical conditions, the development of the global wire and cable industry is showing new trends. Environmentally friendly cables are gradually entering people's field of vision, and gradually replacing traditional cables to become the focus of global cable development. So, what is an environmentally friendly cable?
1. High flame retardancy
When a fire occurs, traditional cables are extremely easy to burn and release a large amount of harmful gases, while environmentally friendly cables are not only difficult to burn, but also prevent the spread of flames and the expansion of disasters after burning.
2. Halogen-free
Traditional cables generally use halogen-containing PVC to make insulating sheaths or cable filling materials, which are likely to produce carcinogenic "dioxin" substances when burned, while environmentally friendly cables use environmentally friendly insulating layers, sheaths and special oxygen barriers. The material is not only halogen-free, but also has good electrical and physical and mechanical properties.
3. Low toxin
The insulation and sheath of the environmental protection cable do not contain lead, cadmium and other heavy metals that are harmful to the human body. When the environmental protection cable is used and disposed of, it will not pollute the soil and water sources.
4. no corrosive gas
Environmentally friendly cables will not produce toxic gases such as HCL when they are produced, used and burned, and emit very little acid gas, which causes little damage to personnel, equipment and instruments, and shows environmental protection characteristics.
5. High light transmittance
The light transmittance of traditional cables is less than 20%, while the standard for environmental protection cable products is greater than 40%. Therefore, the smoke generated when the environmental protection cable is burned is extremely thin, which is more conducive to the evacuation of personnel and the conduct of fire fighting.
6, high protection
The environmental protection cable is not afraid of the erosion of ultraviolet rays, sand and rain, and can slow down the aging speed of the environmental protection cable to a certain extent and extend its service life
For more details about Environmentally friendly cables please click here to access the webpage.
Basic characteristics and uses of reel cables
1. What is a reel cable? What is the purpose of the reel cable?
Drum cables are mostly used for flexible connection and control cables for hoisting lifts, stackers and reclaimers, dumpers, dumpers, mixers, port machinery drums, rock drilling rigs, roadheader drums, and electric scrapers At the same time, it can also be used as a winding and towing cable in the drag chain system. The cable reel is guided by the tow shaft or other similar devices for retracting movement. The reel cable can be installed in a dry or humid indoor or humid industrial environment, and can also be used for outdoor installation.
2. What are the basic characteristics of the reel cable?
1. Small bending radius: The working mode of the reel cable often needs to withstand long-term bending motion, so this kind of cable requires a small bending radius in use, which requires the cable material to have high flexibility and small outer diameter.
2. Excellent tensile and abrasion resistance: Since the working principle of the reel is rotation, winding, and pay-off, the reel itself is generally retracted and rewinded under constant tension, which has higher requirements for the tensile strength of the cable.
3. Rolling pressure resistance characteristics: most of the winding cables are single-track or multi-layer stacking, which puts forward higher requirements for the extrusion resistance of the reel cable itself.
4.Other characteristics of the reel cable: extremely strong mechanical load bearing capacity, oil and water resistance, UV resistance, general acid and alkali smoke prevention, anti-cracking, etc.
Spring Clamps
Spring clamps utilize spring tension to apply pressure to workpieces with one-handed operation. They are suitable for use in light assembly applications to hold material in place while gluing or fastening. The design features two handles joined by a spring, which operates in similar fashion to a clothespin. They can be set in place or adjusted by squeezing and releasing the handles, and they can be stored by clamping onto a clamp rack or shelf edge.Get more news about Spring Clamp Suppliers,you can vist our website!
Spring clamps each consist of two handles tensed by a spring to help keep pressure on the workpiece. Use a spring clamp when you need fast, easy opening and closing.
Needle-nose spring clamps each feature a long, tapered-nose design for hard-to-reach spaces. The ergonomic, 2-component handles can help provide comfort and firm grip. Soft-touch pads also offer a non-marring grip. Made of lightweight polyamide plastic. The ergonomic, 2-component handles are designed to provide antislip properties. Use a spring clamp when you need fast, easy opening and closing.
Deep-reach ratcheting spring clamps are ideal for double-sided step-over clamping, and are specially suited for T-profiles, such as square frames. They feature pivoting jaw pads, which are soft, slip-proof, and designed to help prevent marring. The clamps offer easy pressure application with a ratchet mechanism, and easy-to-control clamping force.
Double-jaw, variable spring clamps feature rapid-action sliding top and bottom jaws. They are made of lightweight, polyamide plastic, and engineered with ergonomic, 2-component, antislip handles.
Ideal for holding insulating mats in place, these spring clamps feature insulated solid plastic construction with an integrated spring, and are fiberglass-reinforced. They can help reduce risk of short circuits.
Retinoic acid in development: towards an integrated view
Retinoic acid (RA), the active form of vitamin A, is a small lipophilic molecule that acts as a signalling molecule in vertebrates by binding to nuclear receptors (heterodimers of RA receptors and retinoid X receptors; RAR–RXR) and regulating the transcriptional activity of various target genes.Get more news about retinoic acid,you can vist our website!
The distribution of RA is tightly controlled in embryonic tissues. Its synthesis from inactive precursors (retinol or beta-carotene) is mediated by retinaldehyde dehydrogenases 1 to 3 (RALDH1 to RALDH3), and a group of cytochrome P450s (the cytochrome P450 26 enzymes CYP26A1 to CYP26C1) trigger its tissue-specific catabolism. Both types of enzymes are often expressed according to mutually exclusive, complementary patterns.
Although there is clear evidence that RA acts as a short-range signal across tissue layers, its role as a long-range, concentration-dependent morphogen has long been debated. Recent work provided evidence for a robust RA gradient in the prospective hindbrain of the zebrafish embryo, shaped by the fibroblast growth factor (FGF)-dependent control of CYP26A1 activity.
Although the most anterior (prospective head) embryonic cells are initially protected from RA signalling by CYP26A1 and CYP26C1 activities, eventually RA is produced by RALDH2 and RALDH3 in the rostral forebrain neuroepithelium and surface ectoderm, and is necessary for proper growth and patterning of the embryonic forebrain and optic vesicle.
During extension of the body axis, a caudal pool of progenitor and/or stem cells is maintained by FGF8 signalling, and RA produced by RALDH2 in differentiating mesodermal tissues (including the somites) acts in an antagonist manner, promoting neurogenesis and regulating ventral patterning genes in the prospective spinal cord. RA is also necessary for 'buffering' left–right asymmetric embryonic signals, thus ensuring a symmetrical progression of mesodermal segmentation, that is, somitogenesis.
Various functions have been ascribed to RA with respect to heart development, recent work implicated it in the proper restriction of the cardiac progenitor cell pool in the early zebrafish embryo, and in the mouse in the formation and proper contribution of the 'second heart field' to the developing heart tube.
Cross-talk between RA and other embryonic signals are being unravelled. Contrasting with the functional antagonism between RA and FGF during caudal axis extension, during organ outgrowth RA was often found to have a positive effect on the induction (or the maintenance of appropriate levels) of FGF(s) involved in these processes. RA is also indispensable for cells to efficiently respond to the sonic hedgehog (SHH) signal, probably by controlling some downstream effectors of this pathway.
RA signalling has been detected in regions of the adult rodent brain containing neural stem cell niches, and some studies have correlated decreased RA levels with neurodegenerative diseases, such as amyotrophic lateral sclerosis, or Alzheimer disease. Retinoids are already used in therapy, and a better understanding of the effects of RA — in combination with other signalling factors — in stem cell populations might lead to novel therapeutic avenues.
Halal Edible Beef Gelatin Powder for Gummy Candy
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1. 100% natural, safe and healthy products with multiple uses.
2. It is a light yellow to white, transparent and shiny, non-impurity particles.
3. It is a hydrolyzed product of collagen. It is a fat-free high protein, without cholesterol. It is a natural nutrient-adsorbed high-grade glue and food thickener.
4. Gelatin's protein is rich in 18 amino acids, 7 are essential amino acids.The content of water and inorganic salts is less than 14%, and protein
Content is more than 86%.
5. Soluble in hot water, insoluble in cold water, but it can slowly expand and soften by absorbing water. Gelatin can absorb water equivalent to 5-10
times of its weight.
6. Gelatin can be widely used in food industry and capsule production.