Process quality
The grease penetration measurement method is a test method for determining the consistency of the grease. The penetration degree refers to the depth at which the standard cone falls freely and penetrates into the grease installed in the standard grease cup after 5S. The unit is 0.1mm. The consistency of the grease is of great significance to the actual use of the grease. Greases of different consistency are suitable for different equipment lubrication requirements. According to the regulations of the National Grease Association (NLGI), the grease consistency value is divided into 9 grades
During the measurement, the inner ring rotates at a constant speed, and the outer ring is fixed. The sensor contacts the outer ring of the bearing and vibrates with the outer ring. The sensor converts the picked mechanical signal into an electronic signal and sends it to the electronic measuring instrument. After the arithmetic processing, the electronic measuring instrument displays the vibration value (effective value, peak value) on the meter head, and the vibration waveform on the oscilloscope. Vibration noise is heard through the horn.
Lubricating grease mechanical impurity test method: mechanical impurities in grease refer to the content of solvent insoluble matter. If mechanical impurities are mixed in the grease, it will be brought into the mechanical rubbing part during use, which reduces the friction reducing effect of the grease, and can cause the friction surface to break, increase the friction torque, and cause the mechanical equipment to vibrate and jump during operation , Swing, etc. Shorten the service life of mechanical equipment.
The kinematic viscosity tester is also known as: the petroleum product kinematic viscosity tester is designed and manufactured according to the requirements of the national standard GBT265 "Petroleum Product Kinematic Viscosity Determination Method and Dynamic Viscosity Calculation Method". The test instrument is suitable for measuring the kinematic viscosity of liquid petroleum products . The instrument has a time to measure the movement time of the sample, and automatically calculates the final result of the kinematic viscosity.
This method is suitable for measuring the kinematic viscosity of liquid petroleum products (referring to Newtonian liquid). The method is to measure the time when a certain volume of liquid flows through a calibrated glass capillary viscometer under gravity at a constant temperature. The product of the constant and the flow time is the kinematic viscosity of the liquid at that temperature. The dynamic viscosity can be obtained by multiplying the measured kinematic viscosity by the density of the liquid at the current temperature.
The pressure oil separation of the grease refers to the tendency of the base oil to be precipitated under the pressure condition of the grease, and is one of the indexes reflecting the stability of the grease colloid. Determining the pressure separation of grease can predict the tendency of grease to seep and bleed out under pressure. It is a simulation of the oil separation state of grease when stored in a vat.
Rotational viscosity tester
Mainly used for oil viscosity test, according to the measuring principle of rotary viscometer, in order to obtain accurate and reliable measurement data.
The corrosion test of the copper grease sheet refers to the ability of the grease to protect the metal copper sheet from corrosion. It has become one of the main indicators of the physical and chemical properties of the grease. It is of great significance to determine the corrosion of the copper sheet of the grease for practical use.
Method A--Compared with the standard color plate for copper sheet corrosion to check the discoloration and corrosion signs on the surface of the test copper sheet
Method B--Check the copper sheet for green or black changes
The extreme pressure performance of the grease refers to the bearing capacity of the grease under the applied load, and is the determination of the extreme pressure and anti-wear performance of the grease under the condition of point contact (four-ball machine method). For the test method, see SH/T 0202 "Determination of Extreme Pressure Performance of Lubricating Grease (Four Ball Method)". This method is suitable for measuring the bearing capacity of grease, that is, using a four ball testing machine to measure the strength of the grease film. This method is equivalent to ASTM D2596-82. Use the following measurement results to judge the extreme pressure performance of grease:
(1) Comprehensive wear value ZMZ—Continuously increase the load according to the prescribed test procedure on the four-ball machine until the test ball is sintered. Take the test results of the 10 times before the negative load of the sinter and calculate the ZMZ according to the formula;
(2) Sintering load PD—the ultimate working load of grease against scratches;
(3) Maximum non-seizure load PB-the load before the axial load will be ruptured by the axial load.
Determination method of grease evaporation loss: Grease evaporation loss is the degree of evaporation loss of the base oil of the grease under high temperature conditions. The smaller the evaporation loss of the grease, the better the high temperature performance of the grease. The evaporation loss of grease mainly depends on the type, nature and fraction composition of the base oil of the grease. If the evaporation loss of the grease is too large, it will cause the concentration of the thickening agent in the grease to increase relatively, which may easily lead to the hardening of the grease consistency, increased friction and shortened service life. Therefore, choosing the right base oil is the key to preparing grease products with good high temperature performance.
Lubricating grease chemical stability is oxidation stability, which refers to the ability of the grease to resist oxidation during storage or when used under high temperature conditions. The chemical characterization of the grease is one of the important factors that affect the service life of the grease. The metal soap and base oil in the grease component are easily oxidized during long-term storage or when exposed to high temperature for a long period of time and in contact with air. As a result of the oxidation, the grease is deteriorated, the dropping point is reduced, and acidic corrosive products are generated. Gum and substances that destroy the structure of grease. At the same time, the metal soap in the grease has an oxidation promoting effect on the base oil and is a catalyst to promote oxidation. The low-point tandem organic acids and colloidal products generated after the grease is oxidized will destroy the colloidal structure of the grease and cause the grease to deteriorate , Can no longer meet the lubrication requirements of mechanical equipment.
Method for determining the similar viscosity of grease: The similar viscosity of grease refers to the ratio of shear and shear speed when non-Newtonian fluid flows, which is obtained according to Poiseuille's equation and the unit is Pa.s. The similar viscosity of the grease is related to the shear rate and temperature at the time of measurement. At a certain temperature, each shear rate has a corresponding similar viscosity. At a certain shear rate, the similar viscosity value of the grease is a variable that changes with temperature. Measuring the similar viscosity of the grease can predict whether the grease is easily moved through the catheter or pumped to the lubrication application site.
Lubricating grease corrosion test method: Lubricating grease corrosion refers to the ability of lubricating grease to keep metals from being corroded, and is one of the main indicators of the physical and chemical properties of lubricating grease. It is of great practical significance to check whether the corrosion of the grease on the metal has practical significance. The corrosion of the grease on the metal will cause damage to the equipment.
Determination method of grease leakage: grease leakage is to simulate the working state and performance of grease in automobile hub bearings, and is one of the means to analyze and evaluate the mechanical stability of grease. It is a screening method that can distinguish products with significantly different leakage characteristics. In the measurement, changes in other important characteristics that may occur in the grease can be observed. By measuring the amount of grease leakage, the mechanical stability of the grease can be evaluated, and the possibility of the grease used in low and medium speed thrust bearings can be judged.
Method for measuring the resistance of grease to water leaching: The resistance of grease to water leaching refers to the ability to evaluate the resistance of grease to water leaching from ball bearings under test conditions. The determination of the resistance of grease to water leaching is related to the actual application The close relationship is not a problem that must be paid attention to when properly selecting grease for mechanical equipment under humid environment conditions.
Insulating oil dielectric strength tester is mainly used in the testing of insulating oil in high-voltage electrical equipment such as transformers, oil circuit breakers, oil-filled cables, power capacitors and oil bushings.During operation, insulating oil is subject to oxygen, high temperature and high The effects of humidity, sunlight, strong electric field and impurities will gradually deteriorate, so that it can not fully play the role of insulation. For this reason, it is necessary to regularly carry out relevant tests on the insulating oil to identify whether its performance has deteriorated. Breakdown voltage is closely related.
Determination method of shear stability of grease: The shear stability of grease refers to the ability of grease to resist the change of consistency under mechanical shear force under certain conditions, and is an important index to evaluate the mechanical stability and service life of grease. Shear stability is related to the strength of the fiber structure of the grease and the adsorption force between the fibers. The degree of change in the structural system of the grease after the shear force is expressed by the consistency of the grease, that is, before and after the mechanical stress is applied to the grease The value of the change in penetration. The change in the working penetration of the grease after the extended shear test can be regarded as the shear stability measured under the test conditions.
Method for measuring the stability of grease rollers: The stability of grease rollers refers to the ability of the grease to withstand mechanical changes in the roller testing machine to resist the change in consistency. It is one of the indicators for analyzing and evaluating the mechanical stability of grease. The degree of change of the structural system of the grease after rolling is expressed by the cone penetration of the grease, that is, the change value of the cone penetration before and after the grease is subjected to mechanical rolling. After the roller test, the value of the change in the working penetration of the grease is considered to be a measure of the mechanical stability of the grease under the shear resistance test condition.
Grease steel mesh oil separation measurement method: Grease steel mesh oil separation refers to the tendency of the base oil to be precipitated under heating conditions, that is, the quality of the stability of the grease colloid under heating conditions, which is to analyze and evaluate the grease An important indicator of colloidal stability, the determination of the oil distribution of the steel mesh of the grease can predict the change state of the skeleton structure of the grease under heating conditions.
Method for measuring the drop point of grease: The drop point of grease is expressed by a temperature value, that is, the temperature of the first drop of the sample in the grease cup of the grease drop point meter. This temperature is called the drop point of grease. The drop point of the grease is an index indicating the thermal stability of the grease. It can predict the maximum temperature limit of the grease. The higher the drop point, the better the high temperature performance of the grease. In general, according to the working temperature of the lubricating part of the mechanical equipment, grease products with a dropping point higher than the temperature of the use part by more than 150°C should be selected to ensure that the grease will not be thinned and lost or thrown away due to the use of the ambient temperature exceeding the dropping point limit. Falling, making lubrication ineffective, causing wear or damage to mechanical equipment.
Definition: When the oil sample is cooled under the conditions specified in the standard, the lowest temperature that can continue to flow is called the pour point.
The maximum temperature of the oil sample when it is cooled to the point where the liquid surface does not move under the specified test conditions is called the freezing point.
Method for measuring the compatibility of grease and synthetic rubber: The compatibility of grease and synthetic rubber refers to the ability of the grease to keep the standard elastomer and the grease from changing its volume and hardness when it is in contact. Determine the grease and synthetic rubber Compatibility can be used to assess the quality of grease.
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