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Basic Knowledge of Wear and Lubrication in Ultrasound Equipment Maintenance
Source: | Author:liahn | Publish time: 866 days ago | 761 Views | Share:
But in the process of using machinery, there will be different degrees of wear and tear, and the ultrasonic equipment is no exception. Then, how should we treat the wear and tear of equipment correctly? We should choose suitable lubricants or take appropriate measures to reduce the wear and tear of equipment. After serious wear and tear, we need timely maintenance or take remedial measures to avoid safety and safety. Therefore.

Basic Knowledge of Wear and Lubrication in Ultrasound Equipment Maintenance

 


But in the process of using machinery, there will be different degrees of wear and tear, and the ultrasonic equipment is no exception. Then, how should we treat the wear and tear of equipment correctly? We should choose suitable lubricants or take appropriate measures to reduce the wear and tear of equipment. After serious wear and tear, we need timely maintenance or take remedial measures to avoid safety and safety. Therefore.

 

(1) Types of wear and tear

 

In the process of relative movement of contact surfaces, the phenomenon of continuous loss of surface materials is called wear. According to the length of wear delay * the wear can be divided into natural wear and accident wear.

 

The causes of accident wear and tear are as follows: defective machine structure, poor quality of parts and materials, poor manufacturing and processing of parts, incorrect assembly and installation of parts or machines, violation of safety, technology, operation and lubrication regulations of machines, poor repair or poor repair quality, and other unexpected reasons. In general, when the natural wear reaches the limit, it is not repaired in time, which is the main cause of accident wear.

 

(2) Lubrication

 

1. The Role of Lubricants

 

(1) Cooling and heat dissipation. Prevent and stop the incidents such as aggravating adhesive wear and corrosive wear, burning rubber sealing rings or bearing bushes, etc. due to the increase of temperature caused by friction and heat generation.

 

(2) Sealing protection. Lubricating grease can effectively prevent moisture, oxygen and harmful media from eroding in moist air, or prevent leakage of internal media. Lubricating grease can also prevent moisture, dust and impurities from intruding into friction pairs.

 

(3) Detergent effect. When the friction pair moves, abrasive particles will be produced, as well as external impurities, dust and so on, which will aggravate the wear of the friction surface. Forced liquid lubrication along the * ring can take away the abrasive particles to reduce or avoid * wear.

 

(4) Reduce friction and wear. Because the lubrication film can reduce the friction factor between the two moving parts, it can reduce the wear and tear consumption of the parts, and also play the role of damping and vibration absorption, thus prolonging the life of the equipment, reducing power consumption and improving the operation characteristics of the equipment.

 

2. Types of Lubricants

 

Lubricants can be divided into four categories according to their state: liquid (lubricant), semi-solid (grease), solid and gas lubricants.

 

(1) Lubricating oil

 

Lubricating oil is also called thin oil. Its physicochemical properties are as follows:

 

Good fluidity, low solidification point, proper viscosity and viscosity coefficient, good load resistance, good oil resistance, extrusion resistance and abrasion resistance, good corrosion resistance and rust resistance, a certain degree of refinement, low ash content, residual carbon and acid value, good thermal stability, not easy to volatilize, not easy to ignite, high ignition point and flash point, good anti-oxidation* safety, not easy to be refined. Aging deterioration; good water separation, anti-emulsification; a certain degree of foam resistance.

 

The inspection points of lubricating oil appearance quality are as follows:

 

Color change

Causes and Prediction of Deterioration

Greasy dirt

Causes and Prediction of Deterioration

New oil darkens

Oxidative degradation

It tastes like burning.

Thermal deterioration

Blackening

Mixed abrasive particles

Stimulating odor

Deterioration of Inert Metal Agents

Muddy

Mix in water

Sediment

Mixed foreign body

Foam

Blend in different oils

 


The selection principle of lubricating oil:

 

A. In order to reduce energy consumption, the lubricant with low viscosity should be preferentially selected under the condition of sufficient safe operation of machine friction parts.

 

B. The friction parts working under high speed load should be lubricated with low viscosity, while the friction parts working under low speed and heavy load should be lubricated with high viscosity.

 

C. Lubricating oil with low viscosity should be selected when ambient temperature is low, whereas lubricating oil with high viscosity should be selected when ambient temperature is low; lubricating oil with high flash point should be selected at high temperature; lubricating oil with low solidification point should be selected at low temperature.

 

D. Shock, vibration, reciprocating motion and intermittent motion are harmful to the formation of oil film. Therefore, lubricants with high viscosity or grease or solid lubricant should be selected for reliable lubrication.

 

E. Lubricating oil with low viscosity should be selected for small clearance of friction pairs, and lubricating oil with low viscosity should be selected for working face with high surface processing accuracy.

 

F. Lubricating oils with lower viscosity should be selected under mechanical cycling conditions. Lubricating oils with higher viscosity should be selected during intermittent refueling. Lubricating oils with higher viscosity should be selected for vertical lubricating surfaces, exposed gears, chains and wire ropes.

 

G. If there is no suitable brand of lubricating oil, the similar brand of lubricating oil can be used for substitution or blending, only slightly larger than the prescribed viscosity of lubricating oil can be selected for substitution, and when blending, as far as possible, no oil with two different properties, different brands and additives can be used for blending.

 

(2) Grease

 

Lubricating grease, also known as dry oil, is a semi-solid lubricant. It is a kind of plastic lubricant with colloidal structure, which is made up of mineral oil and other lubricating liquids mixed with thickeners.

 

Selection principle of grease:

 

A. Lubricating grease with high penetration under high speed and light load conditions; lubricating grease with low penetration under impact, vibration and intermittent working conditions.

 

B. In winter or at low temperature, the grease with low solidification point and low viscosity should be selected; in summer or at high temperature, the grease with high dropping point should be selected.

 

C. When the fit clearance is large and the surface is rough, the grease with small penetration is chosen, and the grease with large penetration is chosen instead.

 

D. Environmental conditions: Calcium-based grease should be generally used in wet conditions, while sodium-based grease should be used in high temperature conditions.

 

(3) Solid lubricants

 

There are many substances that can be used as solid lubricants, including metals and metals.