What is the friction between the belt and the pulley

It's static friction. When objects placed on a fixed plane have a tendency to slide relative due to the action of an external force along their contact surface, but the relative sliding has not yet occurred, the phenomenon that hinders this sliding tendency on the contact surface is called "static friction". There are two things that should be noted here:

One is two objects that are in close contact but relatively stationary; The other point is that there is a tendency to have a relative slip, but there has not yet been a relative slip.

If it is sliding friction, then there will be relative motion. If there is relative motion. That won't drive the belt to turn.

1.When there is no slippage between the belt and the pulley, it is rolling friction! (i.e., the part close to the tight force is the rolling friction).

2.The sliding between the belt and the pulley caused by the elastic deformation of the belt is called elastic sliding. This elastic sliding is inevitable in belt drives, and the result is that the circumferential velocity of the driven pulley is lower than that of the driving pulley, making the transmission ratio inaccurate.

Therefore, there is both rolling friction and sliding friction in the part near the loose edge of the belt! 1

Static friction. Because they are relatively stationary with each other. The pulleys give the belt a sporty trend. But they didn't actually move, because they were relatively stationary with each other.

If it is synchronous motion (the contact part of the belt does not slip), it is static friction, and if it slips, it is dynamic friction. That's all you can do with your knowledge at the middle school level. The deeper reason is, of course, to study molecules and even atoms, but it is better to ask what friction is.

is favorable friction. The only reason for choosing belt drive, instead of gear drive, is so that when the load (resistance) is too large, the belt can slide and not damage the machinery or motor.

I didn't say clearly, whether the belt rotates at a uniform speed, if there is acceleration, relative motion will occur, it is difficult to say, if not, it is static friction. If it is sliding friction, the pulley and the belt will slip, and it will not be able to rotate.

The equivalent friction coefficient between the belt and the pulley is fv=, if the initial tensile force of the belt f0=100n, the influence of centrifugal force is not considered.

Belt drive is made up of driving wheel 1, driven wheel 2 and annular belt tensioned on two pulleys; Due to the tensioning, a compressive force is generated in the contact part of the belt with the pulley. When the driving wheel is running, it relies on friction to drive the belt, and the belt drives the driven wheel to operate. In this way, the power of the drive shaft is transmitted to the driven shaft.

Pulley precautions.

It should be noted that gasoline must be used for the last cleaning before assembly to ensure that the parts are clean and dry, so as to ensure that the mating surface is tightly fitted and free of oil stains, and has sufficient friction.

Check and measure the length of the hexagon bolt for assembly before installation to ensure that the assembly bolt can withstand the bottom end of the blind hole of the taper sleeve after tightening, so as to ensure that the cone surface fits tightly, and ensure that the bolt is subjected to the reverse thrust of the bottom end of the blind hole, resulting in the same anti-loosening effect as the principle of double nuts.

Solution: The acceleration of the object is a = mg m = g =, the velocity reaches v = 3 m s, and the acceleration time t = (v-0) a = 2s

The distance passed by the filial piety state is x1=1 2at 2=3m The visible object accelerates first and then moves at a uniform speed, and the displacement of the uniform motion is x2 = obtained from the kinetic energy theorem: mgx1=ek-0

then the maximum kinetic energy of the object ek= mgx1=

The heat generated by this process q = mgδx = where x = vt-x1 = 3 * 2-3 = 3m is the relative displacement between the belt and the object, and the electrical energy e consumed by the motor pulse source in this process is equal to the kinetic energy obtained by the block plus the heat generated e=ek+q=9j

The degree of sliding friction acceleration improvement a=u*g= m s2

Speed = 3m s

Time = v a = 2s

Distance: 3m "So finally slide out at a constant speed of 3m s."

Blind lead of the electric energy nuclear consumed by the dissipation: w=pt=fvt=self-calculated.

t=2sv=3m/s

f is the frictional force.

Whether the two wheels are horizontal, whether they are rotten and tilted, and what the inclination is did not say Jinghui, in other words, what is the angle between the two wheels and the horizontal plane There is no bright calendar to answer, and the meaning of the question is unclear.

(1) In the machinery driven by the belt, it is often necessary to tighten the belt, which is to increase the friction by increasing the pressure when the roughness of the contact surface is constant;

So the answer is: increase the pressure; Enlarged

1., radial alignment is not good (the error is too large) Douqing.

2. The axial clearance is too small (friction against each other). Sue Rock.

3. The belt is too tight and subjected to too much force (friction.

Enlarged4. The base balance socks are poor or not very firm.

1. The belt falls off the pulley by itself when it is driven, and it may be that the belt is installed too loosely;

2. It is also possible that the pulley and the motor drive end are unbalanced and not in a horizontal plane;

3. Check whether the bearing of the pulley is damaged and whether the pulley is vertical.

4. Check whether the drive end is fixed firmly, and check again whether the belt model matches the pulley.

Hello, look at your problem, and give you an analysis of the following situations:

1: The pulley installation is not vertical.

2: Please check the parallel distance between the two axes.

3: Adjust the allowable shaft deviation of the belt.

4: There is also be a must check whether the belt is compatible with the wheels about these points, the important thing is to pay attention to the problem when installing, I hope to help you.

If it doesn't work, you can find Boyang Technology on **, this ** store, selling European standard pulleys, their customer service is very professional, many problems can be solved, you can go there to ask.

If it is not a straight line, then it is loose and the wheel is not round.

Of course not. Useful work is static friction, and kinetic friction is basically useless work.

Because of the existence of dynamic friction (commonly known as pulley slippage), the pulley will heat up, which will lead to the low efficiency of the belt drive.

However, the existence of dynamic friction is also beneficial, which can prevent the motor from being burned due to faults such as machine jamming. From this point of view, it can play the role of a partial soft connection.

First of all, you don't know much about the definition of friction.

To put it simply: when two objects are squeezed against each other and have relative motion or relative motion tendency, then a frictional force f will be generated that hinders the relative motion or relative motion tendency of the object

3l explains very well, the velocity between the belt and the theory is equal, there is no relative motion, only a tendency to relative motion.

It is static friction, if it is rolling friction, then there will be a "slip belt" phenomenon, that is, the slippage between the belt and the wheel, which is an abnormal working phenomenon, so it can only be static friction.

It is static friction when the belt does not slip.

To distinguish between static and sliding friction, it depends on whether there is a slip between the wheel and the belt.

Generally speaking, in a normal belt system, the friction between the belt and the roller should be static friction, and there will be no sliding friction. For those belt conveyor systems that have been used for a long time and have not been maintained, there may be a slippage between the belt and the rollers, which is the sliding friction.