English (UK) 
简体中文 Hey, you say in the SMT workshop to get a roller line what is so difficult? It is not just a few rollers rotating to send the boards! --Stop! If it's really so simple, why is the production line next door always jammed? Why is Xiao Li's PCB always damaged by static electricity?Choose a wrong line, stop production two lines of tears ahToday we will break open the rubbing said SMT this precision electronics workshop, roller line in the end how to choose to not step on the pit! Today we will break open the rubbing said, SMT this kind of precision electronics workshop, roller line in the end how to choose not to step on the pit!
I. Anti-static? This is not a multiple choice question, it's a mandatory question!
"The roller is not electrified and the boss is not heartbroken."
What is the biggest fear of SMT workshop? Static electricity ah! A small chip thousands of dollars, static electricity "pop" a direct scrap. Select the roller line:
- Material must be stainless steelDon't use carbon steel for cheap, it rusts in minutes in wet workshop and conducts electricity! Stainless steel + polished surface, rust-proof and easy to clean.
- Grounding design should be in placeThe frame is grounded, the drum shaft is added with conductive carbon brushes, and the static electricity is obediently led to the earth (the measured static voltage can be reduced to <100V).
- Anti-static brushes as standard: As that patented device says, the roller is equipped with anti-static brush rollers next to the roller, eliminating static electricity while conveying.
personal viewpointSMT workshop humidity varies greatly, today is fine does not mean that tomorrow does not discharge. Spend more than 10% cost on anti-static configuration, saving millions of repair costs!
Second, not enough precision? PCB runs off to your heart's content!
"When the roller goes sideways, the patch goes all the way down."
PCB board on the roller "snake walking"? Mounter directly reported an error and shut down! How to be steady as a mountain?
- Roller spacing ≤ 1/3 of plate lengthFor example, for a 300mm long board, don't pitch the rollers more than 100mm apart, or the board will hang and wobble.
- Adding lateral guide wheelsThe board will not even run out of alignment if the side guide wheel gap is adjusted ±5mm, like the Suzhou Duchang solution.
- Positioning accuracy ±1mmHigh-precision production line directly on the servo motor + encoder, with the blocker accurate jamming.
real-life example: A factory with ordinary roller line, patch offset rate of 0.5%; replaced with precision guided roller, directly down to 0.02% - the light to save the money of the solder paste is enough to buy half a line!
Third, the double-sided panel to production? Don't let the drum become a "roadblock".
"You can deliver on one side, but you're confused on the flip side?"
Doing a single panel one day, cutting a double panel the next - only to have the roller line jam the back element? Remember these three points:
- Adjustable track height: Plate thickness 0.8~3mm no need to adjust the equipment? Learn that dust removal equipment, track adaptive lifting.
- Hollow drum design: Components with high backs (e.g. heat sinks) are avoided by hollowing out the middle of the drum as they pass by.
- Quick Release Structure: 5 minutes to dismantle the drum when changing the cable, don't let the engineer fiddle around with a spanner for half an hour.
personal spiteI've seen too many factories buy expensive equipment for "double sided compatibility", but in fact, a hollow roller will do the trick! Flexibility is more important than price, understand?
Fourth, load-bearing can not count? Beware of the drum into a "twist"!
"What you think is load-bearing vs. the scene of a roller's fracture."
Heavy duty fixtures + full material PCBs in SMT shops crush weakling rollers in minutes! Teach you to count in two steps:
- count static loadsFor example, for a 10kg PCB, there are 5 rollers in contact, each carrying at least 2kg.
- plus dynamic shocks! Double the impact at the moment of starting and stopping! Heavy duty lines by the formula.Power P=(0.1×total weight kg×speed m/min)/6120.
lesson learnt through blood and tears: An automotive electronics factory did not calculate the dynamic load, the roller running for a month all deformed! It cost $300,000 more to replace the heavy-duty chain pulley, so what happened?
V. Cleaning and maintenance? Don't wait for a breakdown to cry foul!
"Roller sticking solder paste? Stop the machine!!!"
SMT's solder paste dust, flux oils, gumming up the rollers is a disaster! Maintenance tips are here:
- Preferred lubrication-free bearings: IP54 protection class, dust and spatter solder proof.
- Sticky dust roller auto-cleaning: Like that dust removal device, the rubber rollers automatically roll away after sticking the dust, and you can change them by tearing the stamp holes.
- Three things you must do every month::
✅ Alcohol wipe the surface of the roller (don't use water!)
✅ Check grounding resistance <10Ω
✅ Listen for strange noises - bearings must groan before they go bad!
White MisconceptionsThink "Rollers do not need to maintain"? Wrong! SMT workshop dust with electricity (do not ask why, remember on the line), not clean light cardboard, heavy short-circuit fire!
In the end, the SMT drum line is not "just able to turn", it isThe guardian of anti-static, the ruler of precision, the bridge of transferring production! Selected according to these five points - anti-static, stable accuracy, compatibility, load-bearing enough, easy to maintain - your production line if you still fall off the chain ... ahem, bring the configuration list to find me, buy you a milk tea!
