Knowledge About PCB Assembly Manufacturing Safety and Anti-static Treatment
1. Security
⑴ How to prevent personal electric shock accidents at work
①. If there are any electrical safety hazards such as damaged switches, wires, promptly report to the relevant personnel for handling.
②. People who do not understand electrical technology or have a little knowledge should not install or dismantle electrical equipment indiscriminately.
③. Do not use electrical equipment with wet hands or feet (such as pressing switches and buttons)
④. When cleaning, do not wipe the wires or switch buttons with a wet cloth. Be sure to perform sanitation. Please disconnect the power first. Never wash wires and various electrical appliances with water.
⑵ What if someone gets an electric shock?
① Don't use bare hands to rescue the electrocuted person.
② Cut off the power quickly (pull the switch).
③ Report to the leader as soon as possible.
2. Common sense of machinery
The placement machine is a high-speed moving machine, a machine composed of multiple mechanical parts. There are many power sources (motors), power transmission mechanisms (belts, chains), action mechanisms (high-speed rotating placement heads, worktables), the movement of racks and grippers, and they also have sharp cutting edges. Such as these rotating and moving machinery, if you are a little careless in the process of using and operating, it may cause injury to people. Therefore, a list of issues should be paid attention to when operating the machine:
(1) During the operation or adjustment of the equipment, if an accident occurs, press the emergency stop button or pull down the power switch to make the equipment stop working immediately.
(2) When replacing some parts, the machine should be stopped, and the emergency stop button should be locked (to prevent misoperation by others).
(3) Under normal circumstances, when the equipment is being maintained, the operation should be carried out when the equipment is stopped. Under special circumstances, it cannot be shut down, and more than one person should be watched by the side.
(4) The equipment should be used in accordance with the equipment operating rules.
(5) Try to avoid direct contact between skin and flux when working, and use gloves and other tools.
(6) When opening the reflow oven, pay attention to prevent burns and wear gloves.
(7) Open the doors and windows of the equipment as little as possible, so that the dust can be effectively sucked away by the exhaust system, and keep the air fresh and the environment clean.
3. Fire safety knowledge
Due to the stencil cleaning fluid and certain packaging materials, the warehouse of the factory contains a large number of flammable materials. Therefore, all employees who enter the factory must establish fire protection ideas. Fire prevention must be based on the principle of prevention. The following is the daily fire prevention common sense:
⑴. After using flammable products, the cap must be tightly closed and placed in a cool place. Avoid exposure to sunlight and high temperature and dry environment.
⑵. It is strictly forbidden to use fire when entering the factory or forest. In case of using the fire, make sure that the fire is completely extinguished before leaving.
⑶. Ensure that the power cord is in good condition when using electricity, and it is strictly forbidden to use one plug for multiple purposes. Avoid overloading the wires and causing fire.
⑷. Employees must learn to use fire-fighting equipment.
In the event of a fire, you should call the fire alarm number "119" as soon as possible to specify the exact location of the fire.
4. Anti-static requirements
(1) Basic principles of electrostatic protection:
A. Inhibit the accumulation of static charge
B. Quickly, safely and effectively eliminate the static charge that has been generated
(2) Overview of static electricity
Static electricity is a kind of free electric charge, usually caused by friction and separation. The voltage at which the human body can feel an electrostatic shock is at least 3000V, and some advanced electronic components may be damaged by a voltage lower than 1000V, and even a voltage lower than 10V can break down an IC.
(3) Tools and measures for anti-static
A. Use anti-static transmission belt
B. Lay anti-static table mats on the work surface
C. Every operator wears an anti-static wrist strap
D. Use a tester to test the anti-static wrist strap every day to ensure the effective function of the anti-static ring
E. Anti-static table mats must be effectively grounded
