Home » Cnc Machining Guide » Mechanical equipment must be “four must be, four are not repaired, and four are out of service”!

Mechanical equipment must be “four must be, four are not repaired, and four are out of service”!

Posted by: Fymicohuang 2021-10-24 Comments Off on Mechanical equipment must be “four must be, four are not repaired, and four are out of service”!

“Four must have”

A shaft must have a sleeve, a wheel must have a cover

where there is a table, there must be a column, where there is a hole, there must be a cover

“Four No Repairs”

Live without repair, no repair under pressure

High temperature and cold, no repair, no repair without special tools

“Four stop”

No interlock protection disabled, no ground leakage protection disabled

No pre-job training out of service, no safe operation rules out of service

There must be one or four

A shaft must have a sleeve, a wheel must have a cover

where there is a table, there must be a column, where there is a hole, there must be a cover

  • 1. There must be a cover if there are wheels: a fixed protective cover must be provided for the dangerous parts of the transmission with pulleys, gears, and chains.such as the pulley of a drill press, the chain part of a bicycle, etc.
  • 2. A shaft must have a cover: a rotating roller must have a protective cover to prevent employees’ hair, collars, cuffs, etc. from being caught and causing injuries. Such as the roller of the workshop assembly line head, the transmission shaft of the lathe, etc.
  • 3. There must be a fence when there is a platform: there must be a fence along the edge of the platform, equipment and auxiliary tools on the edge. If the height of the equipment platform exceeds 1.2 meters (inclusive), a protective fence shall be set up. The height of the guardrail shall be no less than 0.9m under 2m, and the guardrail shall be no less than 1.05m if the height is 2m and above.such as a large injection molding machine feeding platform.
  • 4. If there is a hole, there must be a cover: there must be a cover on the device where there are holes and holes.It is like a hole on the side of a beer machine.

Four without repair

Live without repair, no repair under pressure

High temperature and cold, no repair, no repair without special tools

  • 1. No repairs under power: When the live equipment is overhauled, or when it is necessary to enter the equipment for maintenance and cleaning, the power must be cut off first, and the warning sign “under maintenance, no closing” should be hung to prevent the moving parts from starting or causing electric shock accidents.
  • 2. No repair under pressure: When the equipment is overhauled, in addition to power failure, pressure must be used to drive or remove pressure vessels before operation can be performed.
  • 3. No repairs for high temperature or cold: When there is a high temperature or too cold area on the equipment, it must be restored to normal temperature before repairing to prevent burns or frostbite.
  • 4. No repair without special tools: During maintenance, disassembly, and assembly, the original special tools must be used to prevent damage to the equipment or damage caused by tools flying out.

When removing the nozzle of the injection molding machine, you must use your own tools. It is strictly forbidden to install a sleeve on the tool or remove it with the aid of a crane.

Four off

No interlock protection is disabled, no earth leakage protection is disabled

No pre-job training out of service, no safe operation rules out of service

  • 1. No interlock protection outage: On equipment with greater risk, equipment that is not installed with two or more safety protection devices must be out of service! These devices ensure that our limbs will not touch the dangerous parts of the equipment, so the installation must be standardized, and it is strictly forbidden to remove or shield it without permission!such as the safety door mechanical, electrical, and hydraulic limit interlock switch of the injection molding machine, the side protection net opening interlock of the punch press, the photoelectric protection switch, the two-hand synchronization button and other protective devices.
  • 2. Disable non-grounding leakage protection: stop using the electrical equipment whose shell is not grounded or not installed with leakage protection switch that meets the requirements!
  • The shell of the coating drying box for electrical equipment used in production should be grounded, and a leakage protection switch should be installed.
  • 3, no pre-job training out of service: equipment employees, technicians, and management personnel with greater operational risks must stop using them if they have not undergone safety training or passed the assessment before taking the job.For example, employees, technicians, and management personnel who operate punch presses, injection molding machines, die-casting machines and other equipment must undergo some pre-job training and pass the assessment.
  • 4. Shutdown without safe operation procedures: The equipment shall be stopped using the safe operation procedures for what should be done, what must be done, and what is forbidden before starting, during, and after the operation.

If you wear the corresponding personal protective equipment before the operation, check the effectiveness of the safety device, if there is a failure during the operation, you must shut down and cut off the power and ask a professional for repair, etc., the safety operation rules are not the operation process, and the expression should be easy to understand.

also invites the majority of workers to participate in the protection of life and health together! If you find the “Twelve Articles” in violation of the iron law of mechanical damage, “Four must have, four no repairs, and four stoppages”, please refuse to work! And promptly report to the enterprise or safety supervision department.

Please keep the source and address of this article for reprinting:Mechanical equipment must be "four must be, four are not repaired, and four are out of service"!

Reprint Statement: If there are no special instructions, all articles on this site are original. Please indicate the source for reprinting.:Cnc Machine Wiki,Thanks!^^