How to judge whether the damage of papermaking equipment is caused by normal loss or installation problems?

Judging whether the damage of papermaking equipment is normal loss or installation problem is actually very clear and can be distinguished at a glance. I'll give you a judgment method that can be directly compared on the spot without complicated instruments.

First, the simplest and fastest judgment: look at three key points.

Damage speed

It will break in a few days or weeks → 90% is installation/alignment/uneven stress.

It took several months and more than half a year to gradually wear out → mostly normal wear and tear.

Damage position

Only one side, corner and part are damaged → the installation is biased and the stress is uneven.

Uniform wear and integral aging → normal wear and tear

Damage morphology

Scratches, edge gnawing, heat discoloration, deformation → installation problems.

Smooth wear, fatigue crack, natural aging → normal loss

Second, different components: normal loss vs comparison of installation problems

1. Bearing (most common)

fair wear and tear

Roller/raceway is evenly polished and slightly fatigued and pitted.

Lubrication is normal, without discoloration or burning.

Service life: several months to more than one year.

Installation problems (one check is accurate)

One side of raceway is severely worn, blue and black due to burning.

Deformation and fragmentation of cage

Eccentric wear of inner/outer ring

It didn't take long for it to break down.

→ Causes: misalignment, uneven locking force, incorrect clearance and improper installation and knocking.

2. Rubber roller/stone roller/press roller

fair wear and tear

The roller surface is evenly worn and the gloss is consistent.

The adhesive layer is slowly aging, cracking and slightly falling off.

Installation problem

The unilateral wear is serious, one side is deep and the other side is shallow.

Local swelling, blistering and tearing of the adhesive layer

Roller rotation has obvious jump.

→ Cause: poor parallelism, uneven pressure at both ends and inclined installation.

3. Gears, couplings and transmission parts

fair wear and tear

The tooth surface is evenly worn and the bright band is consistent.

The noise rises steadily.

Installation problem

One-sided gnawing, corner collapse and serious scratches on the tooth surface

Unilateral flattening and tearing of elastic block of coupling

Large vibration and quick heating.

→ Cause: Out-of-tolerance, improper clearance and improper fastening.

4. Seals (oil seal, mechanical seal)

fair wear and tear

The lip is evenly worn and hardened by aging.

Slowly leaking

Installation problem

One side of the seal is worn out, twisted, flanged and broken.

It leaks as soon as it is installed/soon.

→ Cause: installation inclination, eccentric shaft, rough surface and uneven spring.

5. Consumables such as net, felt cloth and filter belt.

fair wear and tear

Overall uniform pilling, thinning and decreased air permeability.

Installation problem

Local scratch, unilateral wear, wrinkle and deviation wear

Uneven tension leads to local tensile failure

→ Cause: installation deviation, uneven tension and non-parallel rollers.

Third, the five most practical judgment formulas on the spot

Bad after use = installation problem.

Unilateral local bad = installation problem

Even and slow deterioration = normal loss

Heating, discoloration and deformation = incorrect installation force.

Continuous failure in the same batch = it must be installation or alignment.