Detailed explanation: Simple cleaning and refueling method for textile sealed bearings

     New cotton spinning equipment uses a large number of sealed bearings due to dust, heat and high speed requirements. After a certain period of operation of these bearings, the bearings are dry and damaged due to lack of oil inside. For example, the imported air-sea spinning machine has a large number of sealed bearings, and the material is good. However, after several years of use, the grease can not be cleaned and replenished, which causes a large number of sealed bearings to be scrapped, which increases equipment failure and unnecessary expenses.

Two simple and effective cleaning and refueling methods are introduced. The first type of sleeve cleaning and refueling method is suitable for sealed bearings with gaps at both ends of the bearing housing. The method is to first soak the bearing in the kerosene for 1 h to 2 h, and then make a special sleeve according to the outer diameter of the bearing, which can both clean and refuel. The inner diameter of the sleeve is slightly larger than the outer diameter of the bearing from 0.05 mm to 0.08 mm, which is slightly shallower than the bearing. Cleaning and refueling step: add appropriate amount of kerosene into the sleeve, press the bearing into the hand, use the gap of the bearing itself, squeeze the kerosene out, repeat 1 or 2 times; clean and drip before adding the required grease to the sleeve The bearing is placed in the sleeve and gently pressed with a pressure gauge. The bearing oil is flexibly controlled according to the demand. The second type is suitable for special fully enclosed bearings with a gap at one end and a set screw hole. Use the positioning screw hole to communicate with the bearing clearance, first soak the bearing in kerosene for 1 h to 2 h, inhale the kerosene with a special nozzle and oil gun, repeatedly drive the bearing 2 to 3 times, and then use the oil gun to lubricate the required lubrication. Add the fat to it.

The above methods are applicable to a variety of imported or domestic sealed bearings and special sealed bearings. If these bearings can be cleaned and refueled regularly, they will prolong their service life and save a lot of money and reduce the occurrence of bad cars.

For more information and purchase please visit: https://www.supplyforever.com

4 misunderstandings in the use of lubricating grease in the repair of automotive bearings

    1. Butter when installing the cylinder head gasket

Some repairers prefer to apply a layer of butter on the cylinder head when installing the cylinder head gasket, which is considered to increase the engine's tightness. As everyone knows, this is not only useless, but harmful. It is well known that the cylinder head gasket is an important sealing material between the engine block and the cylinder head of the automobile. It not only requires strict sealing of the high temperature and high pressure gas generated in the cylinder, but also must seal the pressure and flow rate through the cylinder head and the cylinder body. Cooling water and oil, it is required to pay special attention to the quality of the seal when disassembling the cylinder head gasket.

If butter is applied to the cylinder head gasket, when the cylinder head bolts are tightened, a part of the butter will be squeezed into the cylinder water channel and the oil passage. When the butter remaining between the cylinder heads is working in the cylinder, some of the oil will flow into the cylinder due to the high temperature. The other part will burn the coke deposits on the joint surface of the cylinder block and the cylinder head. Under the action of high pressure and high temperature, it is easy to break down or burn through the cylinder head gasket, causing the engine to leak. Therefore, do not apply butter when installing the cylinder head gasket.

    2. Diesel car uses gasoline engine oil

The oil is divided into gasoline engine oil and diesel engine oil. Although gasoline engines and diesel engines also work under high temperature, high pressure, high speed and high load conditions, there is still a big difference between the two. The compression ratio of the diesel engine is more than twice that of the gasoline engine. The main parts are much more affected by high temperature and high pressure than the gasoline engine, so some parts are made of different materials. For example, the gasoline engine main shaft and the connecting rod bearing bush can be made of babbitt alloy with soft material and good corrosion resistance, while the bearing bush of the diesel engine must be made of high-performance materials such as lead bronze or lead alloy, but the corrosion resistance of these materials Poor performance. For this reason, in the refining process of diesel engine oil, more anti-corrosion agent should be added, so that a protective film can be formed on the surface of the bearing pad to reduce the corrosion of the bearing bush and improve the wear resistance. Since the gasoline engine oil does not have such a preservative, if it is added to the diesel engine, the bearing bush is prone to spots, pits and even the unfavorable consequences of peeling off during use, and the oil will quickly become dirty and cause the shaft to burn. The accident occurred. In addition, the sulfur content of diesel oil is larger than that of gasoline. This harmful substance will form sulfuric acid or sulfurous acid during the combustion process, and together with the high-temperature and high-pressure exhaust gas, it will enter the oil sump to accelerate the oxidation and deterioration of the oil, so the diesel engine oil is refined. Some anti-oxidation additives need to be added during the process to make the oil alkaline. If there is acid gas intrusion, it can play a certain neutralization effect, so as not to cause the oil to oxidize and deteriorate too quickly. The gasoline engine oil does not add this additive because it is neutral. If it is used in a diesel engine, it will quickly deteriorate due to the corrosion of the above acid gas. Therefore, do not use gasoline engine oil to fill the diesel engine.

    3. Domestic cars blindly use imported engine oil

Some car owners believe that imported oil must be better than domestic oil, so imported oil is used in domestic cars, especially new cars. As everyone knows, this is often not worth the loss, there will be many ills. For example, most imported oils have low viscosity and cannot meet the requirements of domestic vehicles for oil viscosity. In addition, the materials of various matching parts of domestic engines are larger than the imported ones, and most of the domestically produced car engines do not have oil radiators. If blind imported oil is used, the engine will be too thin at normal working temperature. The oil pressure is low, and even the specified working pressure is not reached, which can not meet the needs of normal lubrication, and the wear of the engine is intensified.
    4. No oil is added when assembling the oil pump

When the repaired oil pump is installed on the vehicle, if the oil is not added to the oil pump gear chamber, the oil pump will not pump oil, causing accidents such as burning tiles. Because the gear oil pump relies on the small matching clearance between the gear and the inner wall of the casing, and the correct matching clearance between the gears to generate suction. If the oil pump is not installed or the oil is not supplied to the gear chamber after the oil pump is installed, the oil pump cannot generate enough suction. This is more pronounced for geared oil pumps with some wear and tear. Therefore, don't forget to add oil to the gear chamber when installing the oil pump.

For more information and purchase please visit: https://www.supplyforever.com

Analysis and Treatment of Bearing Heat at the Outlet End of Fuller Pump

Core Tips: 1. Increase the pressure of the gas seal and adjust the compression spring. The Fuller pump is in use, and the tongue valve needs to be continuously switched. When the tongue valve is opened, that is, when discharging, there must be part of the material to be conveyed.
1. Increase the pressure of the gas seal and adjust the compression spring. The Fuller pump is in use, and the tongue valve needs to be continuously switched. When the tongue valve is opened, that is, when discharging, there is inevitably a part of the low-pressure compressed air that transports the material into the discharge chamber. Since the spiral portion of the cylindrical portion is long and the resistance is large, this portion of the compressed air is not easily caught at the dropping funnel. The only way out is to discharge the bearing in the direction of the bearing through several aprons on the front of the discharge end bearing. When the gas seal pressure is low, the airflow cannot be resisted, and the portable raw material powder enters the bearing, causing the bearing to heat up.
In order to solve this problem, it is necessary to increase the pressure of the gas seal, at least to be greater than the pressure of the compressed air conveying the material. In addition, the tightness of the compression springs of several sealing rubber rings must be adjusted to a moderate degree. Too tight to increase wear, the bearing is still prone to heat; too loose, the apron will not play a sealing role, easy to make raw meal into the bearing.
2. The axial clearance of the movable bearing must ensure that the screw shaft of the Fuller pump is generally long. Take the diameter of the 300 Fuller pump as an example. The total length of the screw shaft of the pump is 3155 mm. The distance between the fulcrums at both ends is considered to be 2800 mm. The temperature difference of the casing is calculated at 30 ° C, 40 ° C and 50 ° C, and the thermal elongation of the screw shaft is 0.950, 1.266, 1.582 mm, respectively. For such a large amount of elongation, one of the bearings at both ends must be a movable bearing. According to the design principle, the movable bearing is generally installed at the discharge end, and the axial clearance must be ensured, otherwise the bearing will inevitably heat up. Therefore, a minimum clearance of about 2 mm should be left between the outer end cover of the bearing end of the discharge end and the bearing.
3. The amount of oil in the bearing should be improperly applied to the bearing, which will also cause the bearing to heat up.
When lubricating greases for general rolling bearings, add 1/2 to 2/3 of the bearing space volume of grease. If there is too much grease, the bearing will heat up. If it is too little, the operation cycle will be shortened, the refueling cycle will be frequent, and the second will be caused by insufficient oil.

For more information and purchase please visit: https://www.supplyforever.com

Mistakes in changing roller bearings

Core Tip: There are always some newbies asking, about the problem of changing bearings, is it faster? Still -7 fast? Novices will also blindly worship some of the ceramic bearings, I will explain here
There are often some novices asking, about the problem of changing bearings, is it faster than -5? Still -7 fast? Novices will also blindly worship some of the ceramic bearings. What I will explain here is that bearings need to be considered in many ways to confirm that they are suitable for themselves.
Novice Mistakes 1: Do not consider the characteristics of your own actions, blindly choose
I remember that I used to have a hot brain. I grabbed a set of black ceramic bearings and ceramics from my brother's hand. I feel very cool, but if I really take it, I can't use it. Although the ceramic bearing can be cleaned free and fast, but he can't stand my kind of tossing, FSK was originally the direction of the action of destroying the shoes. As a result, the bearing was basically scrapped in less than three months. So the direction of your practice, decide what bearing you use, and then the bearing, you use the limit small wheel, how fast can he?
Novice Mistake 2: I think -7 is faster than -5
The misunderstanding that novices often have is that -7 is faster than -5, which is actually a huge misunderstanding. The -7-5 bearing standard is only about accuracy, because the SKF standard has always rejected the concept of ABEC because the standard has never stated the material and does not specify the structure of the lubricant and the bracket used. From this point of view, the -7 to 5 that the novices admire is too fast to rely on. The C3 that I used before is -5 is faster than the -7 of the domestic shoes. Because his material is different, the brackets are different, the lubricant is used differently, so the good -5 is faster than -7.
Novice Mistakes 3: I think the design of ilq-96 beads is not strong
This is also my previous misunderstanding, but after I used the iron cover ILQ-9, I will never doubt this. Even my 190-pound FSK player can bear it. Are you worried about yourself? But my personal opinion is that if you are a FSK player, try to choose iron steel, steel bracket ILQ-9, do not choose nylon bracket, nylon bracket increases the speed, but will reduce the bearing capacity.
Novice Mistakes 4: WD40 (carburetor cleaner, or gasoline) for bearing cleaning
Novices often clean their bearings with highly corrosive carburetor cleaners and gasoline, which actually ruined their bearings. The reason is that both materials are highly corrosive. Such cleaning, although very clean, will also ruin the brackets and steel balls, which will tend to be brittle over time, so I do not recommend cleaning the bearings with these two materials.
Novice Mistakes 5: Ceramic Bearings Can Be Used by Anyone
Taking my own example, a good set of black pottery is so ruined. It can be seen that ceramic bearings are absolutely not suitable for some movements. Therefore, I would like to advise you to learn the limits here. FSK's friends should not choose ceramic bearings.

For more information and purchase please visit: https://www.supplyforever.com