What does PCB mean

1. Safety skills test for special construction workers in Shanxi Province

2.

Excavator bucket and arm materials are: Q235, Q345 two kinds of steel

the materials excavated by excavators are mainly soil, coal, silt and soil and rock after pre loosening. From the development of construction machinery in recent years, the development of excavator is relatively fast, excavator has become one of the most important construction machinery in engineering construction. The three most important parameters of excavator are operating weight (mass), engine power and bucket capacity

common excavator structures include power unit, working device, slewing mechanism, control mechanism, transmission mechanism, walking mechanism and auxiliary facilities

the transmission mechanism transmits the power of the engine to the hydraulic motor, hydraulic cylinder and other executive elements through the hydraulic pump, which promotes the action of the working device, so as to complete various operations

working device is the main part of hydraulic excavator. At present, sy series excavators are equipped with backhoe working device, which is mainly used to excavate the soil below the parking surface, but can also excavate the soil below the maximum cutting height. In addition to digging, trenching and loading, it can also carry out simple site leveling work. The excavation operation is suitable for excavating grade I ~ IV soil, and hydraulic hammer or blasting method is required for grade V or above

extended data:

classification of excavators:

there are two common types of excavators driven by internal combustion engine and electric power. Among them, electric excavator is mainly used in plateau hypoxia and underground mine and some other flammable and explosive places

according to the different scale, excavators can be divided into large excavators, medium excavators and small excavators

according to the different walking modes, excavators can be divided into Crawler excavators and wheel excavators

According to different transmission modes, excavators can be divided into hydraulic excavators and mechanical excavators. Mechanical excavators are mainly used in some large mines

According to the usage, excavators can be divided into general excavators, mining excavators, marine excavators, special excavators, etc.

according to the bucket, excavators can be divided into front shovel excavators, backhoe excavators, dragline excavators and grab excavators. The front shovel excavator is mostly used to excavate the materials above the surface, and the backhoe excavator is mostly used to excavate the materials below the surface

References: Network excavator

3. 1、 The scope of identified work types: electrician, maintenance electrician, fitter, assembly fitter, Turner, Miller, CNC Turner, CNC Miller, welder, electric welder, gas welder, automobile maintenance, animal disease prevention and control, waste material recycling, surveying and setting out, mine hoist operator, mine surveyor, coal mine handling, flotation worker, grinder, ironmaker, Galvanizer, refrigeration worker Chemical process tester, other daily chemical workers, boring workers, drilling workers, machining centers, molar machine tool operators, foundry workers, chemical instry, gear making workers, molding workers, forging workers, heat treatment, electric cutting workers, cold working sheet metal workers, sheet metal workers, automobile sheet metal workers, painting workers, oil painters, automobile painting workers, painting workers, tool fitters, motor assembly, high and low voltage electrical equipment assembly Optical measurement, electrical instrument assembler, mechanic fitter, automobile repairer, motorcycle repairer, automobile repairer, precision instrument repairer, boiler repairer, vacuum electronic device assembler, electric light source exhauster, plastic molding worker, radio assembler, textile stopper, Weaver, clothing design and customization worker Canned food processing, carpentry, wood model workers, masonry workers, tile workers, cement workers, concrete workers, scaffolding workers, waterproof workers, decoration workers, plastering workers, road maintenance workers, electrical equipment, car drivers, crane loading machinery operators, crane workers, crane workers. 2、 Appraisal level: primary, intermediate, senior, three, application conditions (1), primary workers who have graated or completed training in various training institutions at all levels can apply for the primary technical level of vocational skill appraisal 2 Intermediate workers who have obtained the primary "technical grade certificate" and have worked continuously for more than five years in this type of work or have received formal intermediate technical grade training can apply for the vocational skill appraisal of intermediate technical grade; Graates of secondary vocational schools, technical schools and vocational schools who have passed the assessment can apply for the vocational skill appraisal of intermediate technical level 3 (1) after obtaining the intermediate technical grade certificate of this occupation, he has been engaged in this occupation continuously for more than 4 years, and has reached 500 standard class hours through intensive training for senior workers of this occupation, and has obtained the vocational qualification training certificate 2) After obtaining the vocational qualification certificate of intermediate worker in this occupation, he has been engaged in this occupation continuously for more than 6 years 3) Senior engineering students of technical college, technician college, senior technical school and other technical colleges, who have completed their studies and passed the examination. (4) graates of this major or related majors who have obtained the intermediate vocational qualification certificate of this profession and have been engaged in this profession for more than 2 years continuously 5) The backbone of proction technology who has been engaged in this profession (type of work) for more than 15 years has reached 500 standard class hours after intensive training for senior workers of this profession, and has obtained the "vocational qualification training certificate" 4 The technician who meets one of the following conditions can apply: (1) after obtaining the professional qualification certificate of senior worker, he has been engaged in the professional work for more than 5 years, and has reached 500 standard class hours after intensive training of professional technician, and has obtained the professional qualification training certificate 2) After obtaining the professional qualification certificate of senior worker, he has been engaged in the professional work for more than 7 years 3) Graates of technical college, technician college and senior technician school who have obtained the professional qualification certificate of senior worker of their own occupation have been engaged in their own occupation for at least 2 years 4) Technical college, technician college and senior technical school technician class students, complete their studies, pass the examination 5) Graates of this major or related majors who have obtained the professional qualification certificate for senior workers of this profession have been engaged in this profession for at least two years 6) The proction backbone and technical leaders who have been engaged in this occupation (type of work) for more than 22 years have reached 500 standard class hours through the intensive training of professional technicians, and have obtained the "vocational qualification training certificate".

4.

Excavator bucket can be divided into forward shovel, backhoe, grab and dragline according to its mechanical action principle

The front bucket of the excavator is hinged on the end of the stick and driven by the oil cylinder. During the operation, the excavation force is from the bottom to the top, and the excavation track is often in an arc. The bucket is mainly suitable for excavating sand, gravel, coal mine and other operations above the parking surface zy12

5. Changcun coal mine may formulate specific plans for economic layoffs in accordance with articles 41 and 42 of the labor contract law, but shall pay one month's salary and economic compensation according to the working years of the employee's unit< In case of any of the following circumstances in Article 41 of the labor contract law, the employer needs to rece more than 20 employees or less than 20 employees, but accounting for more than 10% of the total number of employees in the enterprise, the employer shall explain the situation to the trade union or all employees 30 days in advance, listen to the opinions of the trade union or employees, and then report the rection plan to the labor administrative department, (1) reorganization in accordance with the provisions of the enterprise bankruptcy law< (2) serious difficulties in proction and operation
(3) the enterprise still needs to rece its staff after changing its labor contract e to the change of proction, major technological innovation or business mode adjustment
(4) any other major change in the objective economic situation on which the labor contract is based at the time of conclusion, resulting in the failure to perform the labor contract< (1) signing a long-term fixed-term labor contract with the unit; and< (2) entering into an open-ended labor contract with the employer
(3) there are no other employees in the family, and there are old people or minors in need of support
If an employer reces its staff in accordance with the first paragraph of this article and recruits new staff within six months, it shall notify the reced staff and give priority to recruiting the reced staff under the same conditions< Article 42 the employer shall not terminate the labor contract in accordance with the provisions of articles 40 and 41 of this law if the employee has one of the following circumstances:
(1) the employee who is engaged in the operation exposed to occupational disease hazards has not undergone the pre departure occupational health examination, or the suspected occupational disease patient is in the period of diagnosis or medical observation
(2) suffering from occupational disease or work-related injury in the unit and being confirmed to have lost or partially lost the ability to work
(3) being ill or injured not e to work and within the prescribed period of medical treatment
(4) female employees ring pregnancy, childbirth and lactation< (5) those who have worked in the company for more than 15 consecutive years and are less than five years away from the statutory retirement age< (6) other circumstances stipulated by laws and administrative regulations< Article 46 the employer shall pay economic compensation to the laborer under any of the following circumstances:
(4) the employer terminates the labor contract in accordance with the first paragraph of Article 41 of this law
Article 47 economic compensation shall be paid to the laborer according to the number of years he has worked in the unit and the standard of one month's salary for each full year. If more than six months but less than one year, it shall be counted as one year; If the period is less than six months, economic compensation of half a month's wages shall be paid to the workers
If a worker's monthly salary is three times higher than the average monthly salary of the local workers in the previous year announced by the people's Government of the municipality directly under the central government or the city divided into districts where the employer is located, the standard of economic compensation to the worker shall be three times the average monthly salary of the worker, and the maximum period of economic compensation to the worker shall not exceed 12 years
the term "monthly wage" as mentioned in this article refers to the average wage of the laborer in the 12 months before the termination of the labor contract.

6. Does Dourong seem to have no direct connection with the rent? First of all, Douzi can be changed in size. The rent is generally calculated according to the ton level, such as 30 ton level, 40 ton level and so on. The price varies from place to place

7. Top ten special types of work in coal mines
1. Underground electrical work in coal mines
refers to the work that is engaged in the installation, commissioning, inspection, maintenance and fault handling of underground mechanical and electrical equipment in coal mines to ensure the safe operation of mechanical and electrical equipment in the shift. It is suitable for underground electric tongs and other operations in the process of coal symbiosis and associated pit exploration, mine construction and mining
2. Blasting operation in coal mine
refers to blasting operation in coal mine
3. Coal mine safety monitoring operation
refers to the operation that is engaged in the installation, commissioning, inspection and maintenance of coal mine safety monitoring system to ensure its safe operation
it is applicable to the safety monitoring operation in the process of pit exploration, mine construction and mining associated with coal
4. Coal mine gas inspection operation
refers to the operation that is engaged in coal mine gas inspection, responsible for the integrity of ventilation facilities and ventilation and gas inspection within the jurisdiction, filling in various records according to regulations, and timely handling or reporting the problems found. It is suitable for underground gas inspection in the process of coal mine construction and mining
5. Coal mine safety inspection refers to the operation that is engaged in coal mine safety supervision and inspection,
inspecting the safety facilities and safety proction conditions in the proction workplace, inspecting and supervising the handling of corresponding potential accidents
6. Coal mine hoist operation
refers to the operation of coal mine hoisting equipment to transport personnel, ore, gangue and materials, and is responsible for inspection and operation records. It is suitable for the operation of coal mine hoists, including vertical shaft hoists, concealed vertical shaft hoists, inclined shaft hoists, concealed inclined shaft hoists and open pit mine slope hoists
7. Operation of coal mining machine (roadheader)
refers to the operation of coal mining machine and roadheader at coal mining face and roadheader, engaged in coal dropping, coal loading and roadheader, responsible for inspection and operation record of coal mining machine and roadheader, and ensuring safe operation of coal mining machine and roadheader. It is suitable for the operation of shearer and roadheader in the process of coal mining and tunneling
8. Coal mine gas drainage operation
refers to the operation of underground gas drainage drilling construction, hole sealing, gas flow measurement and gas drainage equipment operation to ensure the safety of gas drainage. It is suitable for coal mine, mine construction associated with coal and gas drainage on the ground and underground in the process of mining
9. Coal mine outburst prevention operation
refers to the operation that is engaged in the prediction of coal and gas outburst, the collection and analysis of relevant parameters, the implementation and inspection of outburst prevention measures, and the inspection of outburst prevention effect, so as to ensure the safety of outburst prevention work. It is suitable for coal and gas outburst prevention in the process of coal mine construction and mining
10. Water exploration and drainage operation in coal mine
refers to the operation that is engaged in the prediction and forecast of water exploration and drainage, the collection and analysis of relevant parameters, the implementation and inspection of water exploration and drainage measures, and the effect test, so as to ensure the safety of water exploration and drainage. It is suitable for underground water exploration and drainage in the process of coal mine construction and mining

8.

Model 35 is a 3.5-ton bucket with a capacity of about 0.11 cubic meters; Model 60 is a 6-ton bucket with a capacity of about 0.3 cubic meters; Model 120 is a 12 ton bucket with a capacity of about 0.5 cubic meters; Model 160 is a 16 ton bucket with a capacity of about 0.65 cubic meters

Model 200 means that the capacity of 20 ton bucket is about 0.8 cubic meters; Model 220 is a 22 ton bucket with a capacity of about 1.1 cubic meters; Model 240 is a 24 ton bucket with a capacity of about 1.2 cubic meters; Model 270 is a 27 ton bucket with a capacity of about 1.5 cubic meters

model 300 is a 30 ton bucket with a capacity of about 1.6 cubic meters; Model 400 is a 40 ton bucket with a capacity of about 1.9 cubic meters; Model 450 is a 45 ton bucket with a capacity of about 2.1 cubic meters

extended data

excavator is composed of power device, transmission device, walking device and working device. Principle: use the bucket to excavate the material higher or lower than the bearing surface, and load it into the transport vehicle or the earth moving machinery unloaded to the stockyard. A self-propelled mining machine that uses a bucket to load stripping materials or mineral procts from the working face and transport them to the discharge site for unloading

the first manual excavator has a history of more than 130 years, ring which it has experienced the graal development process from steam driven bucket rotary excavator to electric driven and internal combustion engine driven rotary excavator, and the application of electromechanical hydraulic integration technology of fully automatic hydraulic excavator