Hydraulic control is widely used in engineering design, especially in large-scale equipment, aircraft, excavators and other hydraulic system as the main function of the control system, complex structure, high precision parts, has reached the Micron, sub-micron level, high accuracy determines the hydraulic system anti-pollution needs, and pollution to a large extent affects the work of the system, according to records, more than 75% of the faults of hydraulic system come from the pollution of hydraulic system, which mainly comes from the parts themselves, that is, the products are produced in the process of production and manufacture, these contaminants include abrasive paste, iron filings, anti-rust oils, emulsions, electrolytes, salts, and other contaminants that may remain on the surface of the parts, or gathering parts deep hole or blind hole, under the action of working fluid, pollutants will move everywhere, destroy the face, cause oil line jam, affect the work of the system, reduce the service life of hydraulic system, with the development of hydraulic control technology and the application of hydraulic control system, simple cleaning method can not guarantee the cleanliness of hydraulic parts, how to effectively control the pollution of each processing link and improve the quality and efficiency of industrial cleaning has become a problem to be solved in the production of hydraulic products. The following describes the hydraulic parts of the ultrasonic cleaning methods:
The mechanism of ultrasonic cleaning, as an effective method of enhanced cleaning, is to take advantage of the cavitation effect of ultrasonic waves in a liquid. Under Sonication conditions, liquid molecules are sometimes pulled and sometimes compressed, and a series of tiny cavities were formed, which were excited into tiny bubbles with a diameter of 50 ~ 500 um and filled with steam from the cleaning solution, there's a local pressure shock wave, air pressure up to hundreds of atmospheres, and under that pressure, all sorts of dirt that are attached to the surface of the part is peeled off, and at the same time, under the Sonication, the cleaning solution pulse and agitation intensifies, dissolution accelerates, thus enhancing the cleaning effect.
Most ultrasonic cleaning equipments are tank structures, the size of the cleaning tank determines the single cleaning capacity, according to the size and number of parts to be cleaned can be selected cleaning tank cleaning form can be single tank cleaning, can be multi-tank cleaning, single tank cleaning means that parts are cleaned in one tank and multi-tank cleaning means that the cleaning process is divided into multiple steps. After parts are cleaned in the first tank, they go into the second tank to continue cleaning. Then you go into the third slot, the fourth slot... ... each tank typically removes a contaminant and the cleaning fluid is selected based on the component material, metal materials commonly used in cleaning fluid, such as gasoline, alcohol, water, etc. . Non-metal materials cleaning fluid mostly non-destructive parts of the solution single tank cleaning often choose gasoline, alcohol and other volatile solutions, in multi-tank cleaning, water agent should be used to reduce the cost and improve the safety. No matter single tank cleaning or multi-tank cleaning, as the cleaning process goes on, the temperature of the solution will gradually rise, which will also cause the temperature of the parts to rise. In general, the temperature of the multi-tank cleaning is between 45 and 55 degrees C, when the temperature of a single tank is 25 ~ 40 ° C after cleaning, both cleaning methods will appear"Foaming" phenomenon, which will enhance the decontamination ability, and the parts need to be protected before cleaning, and the parts to be cleaned need to be protected, after cleaning the parts for anti-rust treatment, and finally for packaging.
The hydraulic shell parts have a complex structure, a large number of deep holes and blind holes, many working procedures, and a long processing period, in the middle of the machining process, before the surface treatment process, and before the Assembly and debugging, the cleaning process should be added to remove the residual contamination in the inner cavity, make parts as clean as required.
