English (UK) 
简体中文 Is your chain rattling with use, or suddenly "clicking" and striking? Don't be in a hurry to scold! Let's talk about the roller chain today.Grinding restorations and anti-jumpingThe doorway to the world - after reading this, you too can be half a chain doctor!
🔧 A. Chain "long" still rattling? Ninety per cent is wear and tear!
Chain "lengthening" over time?It's not stretching at all, it's a gap between the pin and the sleeve.! Dusty workshops can double the rate of wear and tear.
Three tricks to save the chain::
- light wearMeasure the chain elongation with spring scale, and replace it immediately with a new one if it exceeds 3% (Don't be pained, save a little money for bad equipment!).
- moderate wear: Remove the chain and soak it in paraffin and scrub it, then dip it in lubricant - it lasts half a month (temporary emergency).
- Heavy wear and tear: Direct exchangeCarbon steel heat treatment chainWear Resistance Enhancement 40%
Last week a fan tweeted that it still rattled after three chain changes! As a result of a check -The sprocket's sharpened to a razor-sharp point.! Just change the chain but not the wheel? For nothing!
🛡️ IIRC, skipped teeth? Mostly a mine buried in the installation!
Chain suddenly "jumped" can not catch the teeth? Don't blame the quality, check these out:
Q: Should the tight edge be on the top or the bottom?
reply:.Tight edges must be on top!The loose side drops down to put underneath so it doesn't fight. Seen people put it on backwards and the chain runs like a fast one 🎵
Q: Is it OK to have a transmission ratio i=10?
reply:.Looking for death! Don't go over 7 at the most.Otherwise the small sprocket wrap angle is too small to bite and will jump teeth. Do you have to have a high speed ratio?Change to two-stage transmissionOr change the timing belt!
⚠️ Three things you must do to prevent tooth skipping:
- tensioning: Hand-pressed loose edge sag ≈ 2% centre distance (e.g. 2cm sag at 1m centre distance)
- coplanar calibration: Take a laser pointer and shine it on the side of both sprockets, the point of light deviates from the width of the superchain by 1%.
- the science of dentition:.Select an odd number of teeth for the small sprocket!(19/21/23 teeth) wear more evenly
A factory lift always jumped teeth, finally found to beChain case deformation and extrusion-Moved away 5cm and immediately stopped!
💧 Third, lubrication is not just grease! Getting it wrong is a waste of time.
Dry grinding sparking chainI've seen it a lot! The lubrication has to depend on the chain speed talking:
| chain speed v | Lubrication method | Overturning cases |
|---|---|---|
| <1.5m/s | Manual oil brushing | A farm machinery chain rusted to iron. |
| 1.5-7m/s | Oil bath or drip oil | Conveyor dripper clogged, chain broken for 3 months |
| >7m/s | Oil pump injection ⚠️ | Coal crusher oil injection delayed, shafts are worn through |
experience acquired through blood and tears::
- lubricantsDon't choose butter.! Dust turns into sandpaper and grinds harder!
- every monthCleaning Chain Boxes, especially cement factories, flour mills - dust + oil = fatal sludge
🧰 Fourth, exclusive practical: anti-jumping teeth reinforcement tips
Scenario 1: Vertically mounted chain
issues: Chain up for the old shakes?
solution (a math problem)::
① Centre distanceIncrease 20%(e.g. 1 metre designed, 1.2 metres actually fitted)
② Tensioner WheeltopsidePlus spring auto-compensation
Scenario 2: Heavy load also always jumps teeth
issues: Crane "clicks" when lifting weights?
solution (a math problem)::
① ExchangeDouble row roller chainLoad capacity↑70%
② Coefficient of safetydouble take(4-8 for ordinary equipment, ≥16 for cranes!)
A logistics sorting line with this trick, jumping teeth failure from a monthly average of 3 times to half a year 0 times! Saved 20,000 in maintenance costs
👨🔧 The editor slapped the table and said
Don't wait for the chain to sing "Rock and Roll" before you take care of it!Spend 10 minutes a month:
1️⃣feel for sth.(Sagging over 3cm? Tighten it up!)
2️⃣mishear(Clatter? Hurry up with the oil!)
3️⃣see how worn out it is(Rust spots on chainplates? Wash it with paraffin!)
final tyranny (law): I'd rather you buy cheap chains thanDon't save money on lubrication.--I've seen too many "dry grinders" that end up scrapping all the chain wheels and losing even more money!
