Water quenching medium cooling equipment mainly refers to the tank for water quenching medium. Water has a large heat capacity and a strong cooling capacity. When the workpiece is quenched in water, it is easy to form a steam film on the surface of the workpiece, which hinders cooling. For this purpose, quench tank shall be equipped with a stirrer or other device to move the medium to destroy the steam film and homogenize the temperature of the medium. When the water temperature is controlled at 15~25 ℃, a consistent quenching effect can be obtained.

　　2. Salt solution quenching tank

　　The structure of the salt solution quenching tank is basically similar to that of the quenching tank. When the workpiece is quenched in brine, the vapor film is not easy to form. Therefore, the brine tank is usually not equipped with an agitator. The allowable temperature range of quenching brine is also wide. The brine cooling circulation system generally does not use a cooler, and the pumps and pipelines used should consider the corrosion of the salt.

　　3. Caustic Solution Quench Tank

　　The structure of the caustic solution quench tank is similar to that of the brine solution tank. Caustic soda is easy to cause damage to human skin, special attention should be paid to production safety.

　　4. oil quenching medium cooling equipment

　　oil quenching medium cooling equipment mainly refers to the tank containing oil quenching medium. The viscosity of the oil is large and affects the cooling capacity and temperature uniformity. Therefore, the oil tank should control the oil temperature and strengthen the stirring. The oil temperature is generally maintained between 40 and 95°C, most commonly between 50 and 70°C. The oil tank shall be equipped with an oil cooling circulation system and a heating device, and shall also be equipped with a drain port to prevent water from mixing.

　　5. Polymer solution quenching tank

　　The structure of the polymer solution quenching tank is similar to that of the quenching tank. When the workpiece is quenched in this medium. Easy to wither with a thin layer of polymer, affecting the cooling capacity. Therefore, this tank should be equipped with a stirrer, but the stirring capacity need not be too strong.

　　6. Bath quenching tank

The bath quenching tank is a salt bath or lead bath quenching tank, similar in structure to a salt bath furnace. Usually used for graded quenching and quenching.

　　7. Fluidized bed quenching device

Fluidized bed quenching device uses fluidized solid particles as quenching medium. Quenching the workpiece in this medium produces an effect equivalent to salt bath quenching. The device adjusts the cooling capacity by controlling the air flow.

　　8. Gas quenching device The gas quenching device has the following situations.

　　 1) Gas quenching in a sealed container, quenching parts are placed in a sub-container, and cold gas passes through nozzles or blades to form high-speed airflow, blowing on the surface of the workpiece and cooling it. The above-mentioned spray cooling is in this state. This installation is mostly used in large parts, with the advantages of small cracking tendency, small deformation and low cost, but the hardness uniformity of the workpiece is poor.

　　2) strong air cooling in the furnace cooling room, for example, in the front room of the controlled atmosphere box-type Shanghai or in the cooling section of the continuous furnace, a fan or cold air circulation device is installed to forcibly cool the workpiece.

　　3) Air-cooled in the furnace. For example, the workpiece is cooled by a cold gas flow of high-pressure nitrogen gas or the like in a vacuum furnace.

　　4) Strong wind directly blows the workpiece to cool it down.