Like oil mist lubrication, dry oil spray lubrication is also a lubrication method that relies on compressed air as power. Because the dry oil is too viscous, it cannot form a mist using the Venturi effect like oil mist lubrication. Instead, a separate pump (dry oil station) is used to deliver the grease. The grease meets with the compressed air at the nozzle and is blown into a granular oil mist, which is sprayed directly with the compressed air to the friction pair for lubrication. It is characterized in that the space that the lubricant can exceed is directed, quantitatively and uniformly onto the friction surface. Not only is it easy to use, and it saves oil in reliable work, but also can obtain better lubrication effect in harsh working environment. This method of lubrication is referred to as jet lubrication.

The dry oil injection device is suitable for the lubrication of large open gears (such as ball mills, rotary kiln, excavators, blast furnace distributors, etc.) in metallurgical, mining, cement, chemical, papermaking and other industries, as well as the lubrication of wire ropes and chains.

Operation and maintenance of dry oil jet lubrication systems

Before the newly installed or repaired transmission is put into operation, a uniform layer of the same grease as the spray device must be applied to the lubricated surface. Because the dry oil injection system cannot provide sufficient grease at the beginning of operation, it needs to be manually pre-coated. When using the spray device, the following points should also be noted:

1. The grease used is filtered, homogeneous, and properly penetrated. Impurities are mixed in the grease, which not only affects the atomization effect, but also risks clogging the nozzle. In order to facilitate atomization, it is generally necessary to add about 20% high viscosity lubricating oil (such as rolling oil, gasoline, motor oil, etc.) to the grease, and its penetration should not be less than 300. If the abrasion resistance is enhanced, an appropriate amount of molybdenum disulfide can be added to the grease, or a standard brand of molybdenum disulfide grease can be used;

2. Compressed air meets the pressure (ie, not less than 0.45MPa). The air should be kept clean and dry. When possible, install three large pneumatic parts (ie, water separator filter, air pressure regulating valve, and oil mist generator) in the air inlet pipeline, which can increase the service life of the control valve and nozzle

3． The large working pressure of manual dry oil stations should be kept below 7MPa. The newly installed dry oil injection device should be filled with grease before use;

4． The oil reservoir should be kept in sufficient grease and not allowed to evacuate. Otherwise air enters the system and affects the spray;

5. It is necessary to regularly check whether the tooth surface of the lubricated gear is adequately lubricated, and whether the angle of the nozzle is changed. If you need to adjust the oil quantity, you can turn the adjustment screw on the oil feeder to adjust (the adjustment range is 1.5 ~ 5mm / per cycle);

6. The entire spray device is cleaned regularly, which is in line with the smooth and flexible system. Open gear transmission should also timely remove the dirt remaining on the tooth surface according to the site working conditions.