The hottest plate production line and the new ANSI

Gone are the days when the owners or the largest buyers of plate production lines and ANSI new safety standards make quick decisions when purchasing production lines for special products. They usually form a team including engineers, managers and production personnel to study the project, visit suppliers and then select equipment

the first safety standard specially formulated for plate extrusion equipment was published by American National Standards Institute (ANSI) in New York City in August, 1999. Nasi/spi b151.201999 standard was originally developed by SPI Machinery Group in Washington, D.C., and then submitted to ANSI as a national consistent standard. Until now, the plate extrusion production line is only included in a basic safety standard of the extruder

the new standard deals with the design and use of equipment, and it is generally believed that its greatest impact is to require the old plate roll bundle to be repaired or replaced in a wide range to meet the new accident roll distance requirements. Although ANSI is not a government agency, its standards are used as a guide by OSHA inspectors. Violation of the standards may lead to safety summons or fines. If an accident occurs, users who violate safety standards may pay a higher price

other extrusion processes have specific safety standards since the 1980s, some of which were updated in August 1999: ansi/spi b151.21999 for cast film, coating and embossing; Ansi/spi b151.41999 for blown film. Ansi/spi b151.52000 for thin film and flat wound winding equipment was adopted in August 2000

accident roll distance

the most important change in the plate processing industry standard is that the roll on the polishing roller support must be opened within 3s of pushing the emergency button. Over the past 20 years, the manufacturer has manufactured roller type supports with a roll gap of 1 inch and no change in roll distance. If the processor notices the new rules, these things will be replaced. There are still many machines running with roller type supports, but the transformation of these supports cannot meet the new standards

the new plate standard is mandatory for the new and modified plate extrusion production lines delivered after August 2000. From August 2002, all existing machines must comply with the new standard (the existing winding machines must comply with the new film and plate winding machine standard from August 2003)

the following parts of the new plate standard have the greatest impact on processors. The strain extensometer is composed of elastic elements and strain gauges pasted on it:

1 The emergency stop signal is expected to appear by 2020. The roll must be opened for 4in within 3S. Existing machine booth: the exception of opening at least 3 inches within 12103s is also explained. The roll operated by screw jack must be greatly modified to meet the opening requirements of 4in/3s. In addition, the main roller must prevent the roller from rotating within the specified stroke

2. The roll, including the main roll, must be protected. However, this protection function can be provided by molds, end extensions or molding cabinets, and presence sensing devices. Processors generally run thin plates narrower than roller brackets to avoid the trouble of installing a mold frame at the end of the mold. This is against the standard, Lounsbury said

3. Unless the roll is controlled locally, a quasi closed alarm is required for the roll. If the sheet needs to be supplied manually under some processing conditions, the roll may rotate at a low speed when the protective cover is closed and the roll is closed. The condition is that there is a "accident automatic brake" switch, which may be operated by another person in the adjacent area

4. When the operator enters the area that may be involved by the surface winder roll or the belt pressing roll distance of the central winder, a special alarm is required. When entering the no-load area of the winder further, all actions must be stopped

5. It is required to use two independent mechanical devices to fix the winding shaft in the bearing seat

6. For manual sheet access, the user is required to set two operators at the access position: one transfers the sheet to the rotating shaft, and the other stands at the emergency stop button to prevent the first worker from being involved

7. Users are required to train operators before they work on the plate production line to ensure that the correct sequence is adopted. Users are also required to prepare instructions for operators, estimate the necessity of personnel protection equipment, and ensure that these equipment can be used when necessary

8. Users are required to establish regular and regular inspection procedures for the machine to ensure that the safety shield is in a proper operating state and adjusted properly

action plan

sheet metal processors can use EN1050 for quantitative analysis of hazards

the standard EN1050 works like this:

First: establish a multidisciplinary risk assessment team familiar with the current equipment and its operation; Second: the team identifies potential hazards to workers, such as crushing, shearing, cutting or burning; Third: each member of the group judges the frequency of workers' exposure to each hazard, the severity of possible injuries and the vulnerability of workers caused by an accident in a ratio of 1:9 (see table). The classification should consider the technical level and training of workers, foreseeable misoperation of equipment and environmental or pressure conditions, such as higher production requirements; Fourth: create a consistent classification standard for each hazard. Eliminate any classification with great differences, know that their differences are no more than one point, and then the Group classifies each hazard; Fifth: multiply the average frequency of the group by the average severity, and then multiply by the average vulnerability. The range of possible results is 1 × one × 1=1 to 9 × nine × 9=729. The result figures provide a relative classification through which measures can be taken to minimize the risk of the factory

en1050: quantitative analysis method of hazard ranking

frequency of exposure to hazards

classification standard

1 theoretically possible, But it is likely never to happen

2. It may only happen once in the whole service life of a certain process or product

3. It may only happen once in the service life of each process or product

4. A process or product may occur once a year

5. A process or product may occur once a month

6. A process or product may occur once a week

7. A process or product may occur once a work shift

8. A process or product may occur every hour It occurs once in a while

9. It is always in danger. The severity of possible injury

classification standard

1 requires minor emergency; No loss of working time

2 needs to be handled by factory nurses or doctors; No loss of working time

3 requires treatment in the infirmary or emergency room; The loss of working time does not exceed one week

4, requiring hospitalization, the loss of working time does not exceed one month but does not lose the ability to work

5 local permanent disability, small obstacles in dry work

6 permanent disability, visible obstacles in dry work

7 permanent and large disability, serious obstacles in dry work

8 inability to work in normal production environment

9 death or complete disability, Cannot do any work. The vulnerability of the injury classification standard

classification standard

1 actually cannot have complete accident results

2 subtle possibility, but unlikely

3 possible under special conditions

4 under normal conditions, there may be some main conditions for complete accident results. (end)