Low-temperature gas molecules hitting high-temperature solids, will take heat from the solid. The vacuum gauge that calculates the pressure by the heat captured by the gas molecules becomes a heat conduction vacuum gauge. Heat conduction vacuum gauge is mainly used in the field of low-vacuum. Representative thermal conductivity gauges include Pirani gauges and thermocouple gauges. Gauge vacuum gauge metal cylinder with a platinum thin wire inside, both ends connected to the electrode. Platinum thin wires heat when the platinum thin wires are supplied with current through the electrodes, and the heat of the platinum wires will be taken away by gas molecules colliding with fine gold wires or heat radiation or by solid heat conduction. Qb = Qg + Qr + Qs (1) Q is the heat released by the thin line per unit time, and R is Thin wire resistance, I is thin wire current. Qg is expressed as Qg = αΔπda (T-T0) p (2) where T and T0 are the temperatures of the thin wire and the metal cylinder, respectively, P For gas pressure, a is the length of the thin wire. The remaining Qs and Qr can be expressed as Qs = Sκ (T-T0) / L (4) Qr = πdaσε (T4-T04) , κ is the solid conductivity, and L is the length of the electrode. (4) represents heat radiation, and σ and ε are called constant and solid emissivity, respectively. If we keep T and T0 constant, then (3) and (4) are constants. Equation (1) can be expressed as I2R = Ap + I02R (5) A = αΛπda (T-T0) if I02R represents a certain amount of solid heat conduction and heat radiation. I0 is the current of the thin wire when the pressure is 0, Heat loss due to solid heat conduction and heat radiation. A type is not dependent on the pressure of a fixed number If you know the fine wire resistance R, current I0 and the fixed number A, you can get the pressure (5) P
Traction Wire Rope
The wire rope is a helical wire bundle made of steel wires with mechanical properties and geometric dimensions that meet the requirements. The wire rope is composed of steel wire, rope core and grease. A steel wire rope is a rope that is twisted into strands from multiple layers of steel wires, and then a certain number of strands are twisted into a spiral shape with the core as the center. In material handling machinery, it is used for lifting, traction, tensioning and carrying. The steel wire rope has high strength, light weight, stable work, not easy to break the whole rope suddenly, and reliable work. In 1834, European Olubert invented the world's first steel wire rope (smooth steel wire rope).
Wire ropes can be classified according to the material, surface condition, twisting method and purpose of the wire rope.
Classified by material
1. Carbon steel wire rope is made by twisting high-quality carbon structural steel wire as raw material.
2. Stainless steel wire rope, manufactured and twisted with stainless steel wire as raw material.
Galvanized Wire Rope,Steel Wire Rope For Oil Field,Lifting Wire Rope,Traction Wire Rope
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