The Regulations on the Prevention of Occupational Hazards in the Workplaces of Coal Mines (Drafts for Ratification), drafted by the State Administration of Work Safety, formally solicit opinions. The regulations made it clear that the coal mine construction unit violated the regulations, failed to conduct pre-evaluation of occupational disease hazards in accordance with the regulations, and commenced without permission. If the overdue period is not corrected, it may impose a fine of more than 100,000 yuan but less than 500,000 yuan.
The regulations propose that the prevention and control of occupational hazards in coal mines should be subject to national surveillance, local supervision, and corporate responsibility. The legal representative (actual controller) of a coal mining enterprise is the first person responsible for the prevention and treatment of occupational disease hazards in this unit.
The regulations require that coal mining enterprises should set up occupational disease hazard prevention and management institutions and provide full-time occupational health management personnel to take charge of the routine management of occupational disease hazards. Coal mining enterprises shall carry out routine monitoring of occupational hazards, and entrust qualified occupational health technical service agencies to conduct an annual inspection of occupational hazards in workplaces and conduct an assessment of the status of occupational hazards every three years.
Coal mining enterprises shall strengthen the management of labor employment, effectively fulfill their obligation to inform, and when concluding or changing labor contracts with workers, they shall truthfully inform workers of the occupational hazards and their consequences, protective measures and related treatment that may arise during the operation, and The labor contract must not be concealed or deceived.
Occurrence of occupational disease hazards in coal mining enterprises shall be reported to the local coal mine safety supervision authority and the resident coal mine safety supervision agency in a timely manner, and active measures shall be actively taken to reduce or eliminate occupational hazards and prevent accidents from expanding. Workers who have suffered or may be exposed to acute occupational diseases must organize timely treatment and bear the necessary expenses. Coal mining enterprises must not delay, report, falsely report or report accidents involving occupational diseases in coal mines.
If the coal mine construction unit has not conducted pre-evaluation of occupational hazards, the relevant department may not approve the construction project.
In order to strengthen the occupational health monitoring of coal mines, the regulations also require that, for workers exposed to occupational disease hazards, coal mining enterprises shall, in accordance with relevant state regulations, organize occupational health examinations before, during, and after the employee’s employment, and inform labor in writing of the inspection results. By. Occupational health inspection costs are borne by coal mining companies. Occupational health inspections shall be undertaken by medical and health institutions approved by the health administrative department of the people's government at or above the provincial level.
Coal mining enterprises must not arrange for personnel who have not been subjected to pre-post occupational health examinations to engage in occupational disease hazards; they must not engage in occupations that are contraindicated; and must not arrange for minor workers to engage in occupational disease hazards, and must not arrange for pregnancy, Nursing female workers engage in homework, fetuses and babies.
Although there are many types of tapping screws, they all have the following similarities:
(1) are generally made of carbonized carbon steel (accounting for 99% of total production). It can also be made of stainless steel or non-ferrous metals.
(2) The product must be heat treated. Carbon steel tapping screws must be carbonized and stainless steel tapping screws must be solution hardened. In order to make tapping screws to meet the requirements of the standard of mechanical properties and performance.
(3) The product surface hardness is high, the core toughness is good. That is, "soft inside strong outside". This is a major feature of tapping Screw performance requirements. If the surface hardness is low, it can not be screwed into the matrix; If the core toughness is poor, a twist will break, can not be used. So "inside soft outside steel" is self-tapping screw to meet the use of performance, very important requirements.
(4) The surface of the product needs surface protection treatment, generally electroplating treatment. Some product surface must be treated by phosphate (photostatting), such as wall panel self - tapping screws for photostatting.
(5) Production by cold heading process. It is recommended to use high-speed cold heading machine and high-speed wire rolling machine or high-speed planetary wire rolling machine. High speed is emphasized here to ensure product quality. Only the head of tapping screw produced by high-speed machine is well formed and the thread quality is high.
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