The anti-corrosion performance control of group hoist electric hoist is particularly important
The anti-corrosion design of the group hoist is related to the stability, safety and life span of the group hoist. The electric hoist has a compact structure, and the electric hoist whose motor axis is perpendicular to the axis of the drum adopts a worm gear transmission device. Its disadvantages are: large length dimension, large width dimension, rough structure, low mechanical efficiency, and difficult processing. The hydraulic system is dual-controlled, and the pressure can be precisely controlled by the overflow regulating valve and the magnetic contact pressure gauge. The electrical control department adopts low-voltage control, which increases the safety of the control system. The sacrificial anode protection method is a new anti-corrosion control method. The electric hoist has a compact structure, and the electric hoist whose motor axis is perpendicular to the axis of the drum adopts a worm gear transmission device. Its disadvantages are: large length dimension, large width dimension, rough structure, low mechanical efficiency, and difficult processing. The hydraulic system is dual-controlled, and the pressure can be precisely controlled by the overflow regulating valve and the magnetic contact pressure gauge. The electrical control department adopts low-voltage control, which increases the safety of the control system. It can effectively control the oxidation of the surface of the electric chain hoist.
The anti-corrosion control of group hoist electric hoist mainly has the following aspects:
(1) Brush the anticorrosive paint on the chain electric hoist regularly to isolate the source of corrosion;
2) Control the working environment of the chain electric hoist and reduce the concentration and humidity of harmful gases in the atmosphere.
3) The sacrificial anode protection method is used for cathodic protection of the group hoist, and the electrochemical anti-corrosion technology is used to realize the anti-corrosion control of the group hoist.
Sacrificial anode protection is the most important anti-corrosion control method for group hoist. The electrochemical corrosion principle of the group hoist is to form a primary battery on the metal surface. A primary battery is usually composed of a central carbon rod, a peripheral zinc skin and an electrolyte solution between the electrodes, where the central carbon rod refers to the positive electrode and the cathode. The outer zinc skin refers to the negative electrode and the anode, which react with the electrolyte to ionize zinc.
Specifically, zinc oxidation occurs on the zinc skin around the anode, and zinc is oxidized into an ionic state and generates electrons. The reduction reaction of hydrogen ions occurs on the central carbon rod of the cathode, which consumes electrons and produces hydrogen gas.
With the continuous ionization of the surrounding zinc flakes and the continuous generation of electrons, anodic corrosion occurs, which is called a sacrificial anode from a chemical point of view.
Electron corrosion is related to the electrical sequence of metal elements. Once the lifting equipment is electrochemically corroded, the cathode of the corroded galvanic cell is a metal with a high standard electrode potential, the anode is a metal with a low standard electrode potential, and zinc is a standard electrode. Metals with low points are often corroded as anodes in electrochemical corrosion. Therefore, we can use tin and zinc on the lifting equipment to protect the main material steel of the lifting equipment. Sacrifice extreme protection laws.
