Extension springs are used in a wider range, in the production of assembly, computers, automotive, medical, aerospace, construction machinery and wind power and other fields have applications. I will give you a detailed introduction to the extension spring.
Features:
A number of different terminations or "hooks" are used to secure the source of tension in the extension spring. Extension springs work in reverse to compression springs. Compression springs work in reverse when compressed, while extension springs work in reverse when extended or pulled apart. When the ends of an extension spring are pulled apart, the spring tries to pull them back together. Like compression springs, extension springs absorb and store energy. But unlike compression springs, most extension springs are usually under some degree of tension, even without any load. This initial tension determines how tightly the extension spring is coiled without any load.
Applications:
Medical respiratory equipment, motion control, medical mobility equipment, hand tools, home care equipment, vibration damping, pump springs, mechanical and electronic protective hardware, fluid control valves, mechanical aerospace components, actuators, switchgear.
Extension springs, also known as helical extension springs, are generally of equal pitch and have a mostly round cross-section, and they can be used in many applications such as production assembly, experimentation, research and development, and maintenance. Tension springs occupy an important position in the global market, and are widely used in the fields of national defense, marine, computers, electronics, automobiles, molds, medicine, biochemistry, aerospace, railroads, nuclear power, wind power, thermal power, construction machinery, mining machinery, construction machinery, elevators and so on.
A key to the design of compression springs:
1, ? Design of compression springs need the basic parameters, that is, the outer diameter, inner diameter, length, that is, the range of space occupied by the spring, which is the first condition.
2, spring force, must clearly understand when the spring is in the working state of the actual required strength (N), to facilitate the selection of materials and wire diameter.
3, compression, that is, compression stroke, which determines the number of coils.
4, the spring working environment, working in a high humidity environment, the spring surface needs to be done surface treatment, in order to prevent corrosion and moisture; working in a high temperature environment, due to the temperature of the spring has a huge impact on the service life, so the high temperature environment needs to be selected to work in a high temperature material, in order to work properly.
Second, the key elements of the design of extension springs:
1,? Need to have the tension, that is, the weight of the load, and thus to determine the material and wire diameter and adjustable length of the tension spring.
2, ? The spatial range, knowing the spatial range, you can decide the outer diameter of the tension spring, free length and the number of coils.
Commonly used materials for metal springs are steel wire (SWC), piano wire (SWPB, SWPA), high carbon spring steel wire (SWA?, SWB), stainless steel wire (SUS303, SUS304, ?SUS302, ?SUS301), weldable stainless steel wire (SUS304? (NI- COATED)), nickel-plated wire (SWIC-F), and so on. The form of the spring is divided into two types: A type and B type. If the working drawing of the spring is made in accordance with GB4459, the diameter of the spring material is between 0.16 and 0.45mm. Spring stiffness, outer diameter, free length are in accordance with the provisions of GB1973 level 3 manufacturing, if manufactured in accordance with the 2 level needs to be added in front of the symbol "2", but the hook and loop opening dimensions are to be manufactured in accordance with the 3 level of precision. Carbon spring steel wire spring surface is generally oxidized and then marked in accordance with GB1238? Stainless steel spring manufactured only for surface cleaning can be, without marking. Japan, Germany, the United States and other countries have developed a lot of spring standards, but the specific spring standards to be determined from the scope of use, only in accordance with the corresponding standards is not enough.
The k-value of extension springs is calculated using the same formula as for pressure springs. Due to the differences in the material of the wire used for making the extension spring, wire diameter, spring index and heat treatment method, the initial tension of each extension spring produces an uneven phenomenon. According to the modulus of rigidity of the wire: piano wire G = 8000; stainless steel wire G = 7300; phosphor bronze wire G = 4500; brass wire G = 3500? These parameters can be calculated K value of the extension spring. The tightness of coiling in an extension spring is determined by the initial tension without any load. The basic principle of an extension spring is to utilize the exchange between absorbed and stored energy. The end setting "hook" is the source of tension in the extension spring.
The role of extension springs, extension springs are mainly used in daily hardware . House lamps, water heaters, electronic scales, sockets, etc. all involve the use of extension springs. Extension springs also have a place in the electronic and electrical industry such as vacuum cleaners, washing machines, televisions, cameras and so on. Craft design accessories also contain the use of some extension springs such as toys, handbags, leather goods and other small crafts. In the industrial and automotive fields have applications such as mining machinery, construction machinery and other machinery. Although the tension of the spring is very small, but the force is still quite large, on some instruments can play a role in shock absorption to protect the instrument. Extension springs on the use of environmental requirements are not high and thus the use of a wide range of corrosion-resistant, high and low temperature environment can work.
In fact, a closer look at the extension spring used in all aspects of our lives. Only according to some formulas to calculate the size of the so-called elasticity and constants and so on. The data used in the formula are based on the actual situation. Therefore, the size of the spring depends mainly on the scope of your use.