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.

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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.

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