The working principle of gasoline engine and diesel engine oil is different, to put forward different requirements, reflected in the preparation process of the oil, then the formation of the respective formula system. Although adding additives have detergent, dispersant and antioxidant, but due to solve the problem of different emphases, adding proportion is different, the gasoline engine low-temperature sludge is more outstanding, so adding dispersant than the proportion of diesel engine, while the high temperature detergency of diesel engine and the prominent problem of anti oxygen therefore, the detergent than the proportion of gasoline engine oil, especially a large load of CD grade diesel oil additive compound formula plus some sulfurized alkylphenols (such as LZ6499, LZ6500) to solve the high temperature oxidation resistance of anti corrosion problems. Related reading: how to distinguish the car is in the "burn oil" phenomenon of residual oil how to dispose of oil change more saving environmental protection.



Single stage and multistage oil oil selection

Single stage oil such as 5W, 30, 40, only comply with the SAE engine oil viscosity classification (SAEJ300Apr.84) in a single level, there are strict requirements of applicable environment temperature, such as the lowest temperature of SAE40 suitable for 0 DEG C; multistage oil can simultaneously satisfy multiple viscosity class, such as SAE15W/40, refers to the low temperature performance can meet the requirement of 15W, the high temperature viscosity can reach 40 of the index, which spans 5 viscosity grade, so the multistage oil can be used in four seasons.



Because the multistage oil has good low temperature flow and pump delivery performance, but also has high temperature lubricating ability, thus selecting multistage oil is the best choice, such as the northern region selection SAE5W/30, the Central Plains region selection SAE15W/40, southern area selection of 20W/50; but the multistage oil price to be more expensive than single grade oil, consider from economy, in some seasons can also choose single grade oil, such as the use of SAE30 in the northern area of the spring and autumn season, the use of SAE40 in summer; in the central region in winter using SAE40; use SAE30 in southern winter, spring and autumn using SAE40, use the SAE50 summer (see chart single and multistage oil viscosity level and suitable temperature of 1). For vehicle regions throughout the north and south of the multistage oil must be used, such as SAE15W/40.



The viscosity of the engine oil level selection



From the development of automobile manufacturing technology point of view, and the engine manufacturing more sophisticated, its output to the high power and high load development; from cars using environmental change point of view, with the development of highway, the car running on the high temperature and high speed in the environment with long time constant, all of the oil made more stringent requirements. From the economic maintenance, lubrication performance of high profile oil is good, not easy wear parts, repair cost was decreased, and the high profile of oil oil cycle can reach 8000~10000km, synthetic oil is as high as 15000~25000km; many aspects of integrated, selection of high-grade oil or cost-effective. Therefore, suggestions for selection of SF, SG grade gasoline engine, diesel engine using CD, class CE, or choose SF/CD, SG/CD general purpose engine oil. There are a lot of fake oil on the market at present, the best selection of the Great Wall, shell Shell and other domestic and foreign well-known brand of oil. In addition, in use, to be diligent to check, timely fill, form good habits change the oil regularly.


Vibrator sieve through vibration, mostly for the eccentric shaft vibration exciter and box type vibrator. The eccentric shaft vibration exciter has convenient installation and adjustment, but the cost is high, and the eccentric distance could not be adjusted; box vibrator with adjustable to the relative position of the fan-shaped eccentric block, can realize the vibrating force adjustment, so as to achieve the purpose of adjustable amplitude.

 Centrifugal force vibration exciter eccentric mass produced during the work of the eccentric shaft bending, leading to the relative deflection of bearing inner and outer rings, due to the eccentric vibration will occur in the rotation frequency and its first harmonic caused by, so the running of the inertia force and inertia will cause the bearing dynamic reaction force and vibration, stable working state damage to bearings and other components, to generate high-frequency vibration. The study shows that the analysis, when the vibration exciter and a screen box bearing vibration frequency of elastic vibration of a first-order natural frequency is same, will cause the strong vibration sieve box elastomer.



The composition of the vibration system of the bearing and the eccentric system, can be regarded as a single degree of freedom system. Bearing drive shaft and the driven shaft system exists a certain value of the resonance frequency, if a certain vibration frequencies close to resonance frequency, resonance occurs. In addition, due to the bias in the centrifugal force of inertia, so will produce bending vibration, if speed is close to the critical value, then bending resonance.



2 bearing geometric accuracy



Vibrating screen vibrating force, cause bearing bear large radial force, resulting in strong vibration. Bearing precision is high, the smaller the vibration. Raceway especially vibration waviness on bearing rolling body surface maximum, vibration of rolling body and the cage and the outer ring surface of rolling gap and the relative motion will cause the bearing, which is due to high frequency of the rolling body spin, the work surface with both the inner and outer raceway contact ring, rolling body, and keep the the magnitude of the vibration rack generated approximately 4:3:1 relationship. So reducing the bearing vibration should first improve the machining precision of the rolling body surface.



3 bearing radial clearance



Radial clearance is too large will cause the bearing system to generate larger vibration. The radial clearance is too small to cause high frequency vibration is too large is caused by low frequency vibration. Through the test of bearing vibration sieve results show that the radial clearance is too large, reduce the bearing radial elastic system natural frequency, easy to produce resonance, the larger low-frequency vibration. This is because at the point of impact rolling body and the ring will produce greater acceleration. In the impact of early, produce high frequency has nothing to do with the mechanical quality and shape compression wave, and sent into the inner metal; and in shock period, will be produced by mechanical force of a wave and low frequency mechanical vibration shock compression. The radial clearance of the bearings in the pass band on vibration.



4 matching



With the outer ring and the bearing hole will affect the vibration transmission, with a tight will force the rolling deformation, increase the shape error, lead to increase the vibration. A loose fit can make the oil film clearance is generated in the damping effect. The outer ring and (bearing supporting hole) material properties vary greatly, especially in the meantime placed rubber damping ring, can restrain the vibration of the transmission.



5 the friction and lubrication



Bearing is the main vibration source is difficult to control the vibration sieve, the vibrating screen is to maintain a great incentive, so the radial bearing large, vibration sieve in the work process, large vibration force caused by the elastic vibration of the bearing system. If the lubrication is bad, will have a larger friction bearing temperature rise too high, thermal expansion is too large, so that the radial clearance is significantly reduced, thereby exacerbating friction, further improve the temperature rise.



The above five points are Zhengzhou Xinhai machinery and according to the experience accumulated and vibrating screen information summary of user feedback and daily maintenance of Xinhai machinery suggested vibration sieve device users should pay attention to equipment, to ensure the stable operation of the equipment, to avoid damage to the enterprise. Zhengzhou Xinhai machinery products mainly include: PE jaw crusher, PF crusher, impact crusher, cone crusher, efficient fine crusher, ball mill, ball mill, cement lime rotary dryer, rotary kiln, vibrating screens, conveyors and other equipment. Welcome new and old customers to inspect the Xinhai production base.