On September 3, 2019,Visit of American expertsLuoyang shunxiang machinery co. LTDVisit, investigate and guide!Under the leadership of shunxiang in luoyang,American experts visited the machining workshop, the casting workshop and the mold workshop.Inquire about the equipment, technology and talents of our factory.Prepare for further instruction in factory.American experts communicate with the leaders of our factory about the experience and technology of American factory production process.Luoyang shunxiang machinery co. LTDV casting production line with ten thousand tons capacityAnd thousand tons of resin sand, coated sand production line casting,Heat treatment, machining and welding center.The company keeps learning advanced management methods.6S site management has been introduced successively.Organizational learning amoeba business model,Improve the management team management level. American experts to visit and guide the work,For the future development of luoyang shunxiang,To improve the company's product quality, technical level, etcHave very important meaning and value!

China's top 50 coal enterprises and coal output in 2019 were released by the China national coal industry association on Aug. 6, 2019.Among the top 50 coal companies,National energy investment group,Shandong energy group,Shaanxi coal chemical groupThey are in the top three.Of the top 50 coal producers,National energy investment group,China media energy group,Yankuang group co. LTDThey are in the top three.

On the morning of August 2nd, the factory appraisal and press conference of 8.8 meters super-large intelligent coal mining machine jointly developed by xi 'an reloading xi 'an coal mining machinery co., LTD. And shindong coal mining group co., LTD., a national energy group, was held in xi coal mining company. At the meeting, the expert review committee organized by the China coal industry association heard the technical report of the project team and reviewed the relevant technical documents. After questioning, defense and discussion by the experts at the meeting, it was unanimously agreed that the world's first 8.8-meter super-large intelligent mining machine independently developed by west coal mining machinery co., ltd. is the first in China and can meet the mining demand of 8.8-meter large mining height working face, and agreed to conduct underground industrial test through factory evaluation. Expert assessment committee read out the independent research and development of the world's first 8.8 meters large mining height are broken intelligent coal winning machine factory review opinions: the project in view of the large mining height are broken coal winning machine's reliability and intelligent key technology were studied, such as independent research and development the world's first 8.8 meters large mining height are broken intelligent coal winning machine, installed power of 3030 kw, high memory cutting, automatic adjustment, three-dimensional positioning, navigation, remote monitoring, and other functions, improve the intelligent level of the coal winning machine. The successful development of the world's first independent research and development of 8.8m super-large intelligent coal mining machine is a major breakthrough in the technical innovation of coal mining machine of west coal mining company, which has important guiding significance and experience support for the domestic mining equipment industry. This technical innovation has broken through the technical difficulties in the development of domestic super-large and high-height coal shearer, and realized the high-yielding and high-efficiency mining of extra-thick coal seam, which has an important role in promoting the core competitiveness of China's coal equipment manufacturing. Vice President of China coal industry association stressed that the core of development in the new era is high-quality development. Facing a new round of * * *, the industrial revolution of science and technology and the informationization, digital development tide and the future development trend of intelligent, he asked the coal science and technology staff, should be based on the change trend of world science and technology * * *, profound understanding of "development is the priority, and * * * is * * * resources, innovation is * * * power" of the scientific connotation and "with the development of science and technology initiative firmly into his own hands" of great significance, is focused on the coal mine intelligent key problem, speed up the construction of coal mine intelligent technology system, lacking high precision sensors, quick short board, such as communication, basic software gate-crashers celebrated the mine intelligent "no man's land", keep the concentration, We will take the initiative, focus on safe, green and intelligent coal mining and clean, efficient and low-carbon utilization, strengthen basic theoretical research, and tackle key technologies. We will present our outstanding achievements in scientific and technological innovation to the 70th anniversary of the founding of the People's Republic of China.

　　The state administration of coal mine safety announced four major coal mine accidents Thursday,according to the official website of the state administration of coal mine safety. 　　Coal mine safety supervision and administration departments,coal industry administration departments and coal mine safety supervision bureaus at the provincial level in all coal-producing provinces,autonomous regions and municipalities directly under the central government,xinjiang production and construction corps: 　　Recently,four major coal mine accidents occurred in sichuan,guizhou,hebei and other places in succession,killing 21 people in total,with severe impact and profound lessons,and the situation of coal mine safety production is grim.In order to draw a profound lesson from the accident,curb the frequent occurrence of coal mine accidents,and earnestly strengthen the work of coal mine safety,the relevant information is hereby notified as follows: 　　I.basic information of four major accidents 　　(I)the July 28 gas explosion accident of houxin coal industry co.,LTD.,wangcang county,guangyuan city,sichuan province. 　　On July 28,2019,a gas explosion occurred in houxin coal industry co.,ltd.in wangcang county,guangyuan city,sichuan province,killing three people and injuring two others.The mine is a private enterprise with an approved production capacity of 90,000 tons per year and is a low-gas mine. 　　Preliminary analysis shows that the main ventilation system of this mine is not free due to roadway collapse and local ventilation fans are used for ventilation in roadway type coal mining face,which leads to gas accumulation in operation without wind breeze.Operators illegally use naked blasting method to deal with large coal Ganges,and the explosion spark triggers gas accumulation in the upper part of no.2 vertical hole.The main problems exposed by the accident are:first,the mine on June 12,due to the existence of safety exit collapse on the work surface,return wind alley many disrepair and other hidden dangers,was ordered by sichuan coal mine safety supervision bureau north sichuan supervision branch to stop production,the relevant certificates were temporarily withheld,but the mine to repair and correct the name of the work face illegal production.The second is to adopt the"roadway type coal mining"technology,which is banned by the state.The ventilation management is chaotic.A local ventilator is used to supply wind to three vertical eyes at the same time.Third,safety monitoring facilities were not installed on the accident working face,and operation rules and safety technical measures were not prepared.Fourth,the management of gas inspection and blasting was disordered,and the system of"one gun and three inspections"and"three person chain blasting"was not implemented.The personnel did not withdraw to a safe place during the blasting,and the personnel did not work without a license.Fifth,the mine is suspected of concealing,delayed accident,blind organization rescue. 　　2.Coal and gas outburst accident occurred in longwo coal mine of guizhou zheshang mining group co.,LTD.,xiuwen county,guiyang city,guizhou province. 　　On July 29,2019,a coal and gas outburst occurred in longwo coal mine of guizhou zheshang mining group co.,LTD.,liuguang town,xiuwen county,guiyang city,guizhou province,resulting in four deaths and two injuries.After the accident,the mine conceals the accident,after the masses reported verification.The mine is a private enterprise with the approved production capacity of 150,000 tons per year.It is located in the coal and gas outburst area.The gas grade appraisal result is low gas mine,and there is no risk of coal and gas outburst in the area above the elevation of+977.3 meters. 　　According to the preliminary analysis,the coal mining face in the east mountain was arranged illegally outside the scope of outburst risk appraisal to organize production,and no anti-outburst measures were taken.The coal cutting machine induced coal and gas outburst.The main problems exposed by the accident are:first,illegal arrangement of coal face,and suspected of ultra-deep mining.Production shall be organized in violation of regulations by excluding concealed areas from the above drawings,temporarily sealing the construction,recording two accounts in and out of well inspection bodies,and not carrying identification CARDS of personnel's location inspection in concealed areas.Second,the prevention and control of coal and gas outburst has not been carried out as required.No gas parameters have been measured and no outburst prevention measures have been taken.Third,the working face of the accident did not prepare operating rules,did not install safety monitoring equipment,no pressure wind self-help facilities.Fourth,ventilation management disorder,ventilation facilities are not qualified,east down the mountain coal face insufficient air volume.5.Deliberately concealing the accident,failing to report the accident to the relevant departments after the accident,and transferring the body;When the government departments concerned receive reports from the masses to the mine for verification,they falsely report the accident site and seal the accident area and organize relevant personnel to collude to supply. 　　(3)the July 31 gas explosion occurred in the dashu coal mine of guizhou xinsouthwest mining co.,LTD.,liangyan town,qixingguan district,bijie city,guizhou province. 　　On July 31,2019,a gas explosion occurred in the dashu coal mine of guizhou xinsouthwest mining co.,LTD.,liangyan town,qixingguan district,bijie city,guizhou province,killing seven people and injuring one.The mine is a private enterprise with an approved production capacity of 150,000 tons per year and is a low-gas mine.In 2015,the mine received the reply of merger and reorganization of 450,000 tons per year. 　　According to the preliminary analysis,the 17301 coal working face of this mine was flooded by water gusher in the transportation roadway,and the ventilation system of the working face was blocked.The operators used local ventilation fans to supply wind to the return air roadway,and built up the working face in the return air roadway.Accident revealed the main problems are:one is the illegal operation,the continuous heavy rainfall in the mine 17301 mining face of transport lane yield increases,the mine water disasters prevention and control measures in time,cause working face and roadway flooded parts of the system,and not to drainage,while the use of partial ventilator to return air lane for the wind,and in return air roadway construction tunneling faces up to the mountain,the illegal exploitation of coal.Second,the ventilation and gas management is not in place,the safety monitoring system is not running,and the operators do not carry portable methane alarm device,so they risk working without gas inspection.The third is blind rescue,after the accident,the coal mine enterprise did not timely report to the relevant departments,the mine manager,chief engineer to organize rescue,almost caused secondary accident.Fourth,the mine has been organizing production in the name of 150,000-tonne-per-year production in the name of the mine since it obtained the approval of 450,000-tonne-per-year merger and reorganization in 2015,without actually carrying out the related work of merger and reorganization.Fifth,the superior company of the coal mine is an affiliated shell company,which has not actually controlled the coal mine,and has not conducted effective supervision and management of the coal mine. 　　(4)the"8·2"large impact ground pressure accident of tangshan mining company,kailuan group,hebei province. 　　On August 2,2019,seven people died in the tangshan mining company of kailuan group in hebei province.The mine has an approved production capacity of 4.2 million tons per year and is a high gas and rock burst mine. 　　Preliminary analysis shows that rock burst occurred in the F5010 contact roadway in the coal pillar area of the air shaft of this mine(mining depth is nearly 800 meters),causing roof caving of this roadway and two surrounding roadway,causing serious floor heave and side heave of the roadway,resulting in death.The detailed cause of the accident is awaiting further investigation. 　　The four accidents mentioned above once again reflect that some regions and enterprises cannot stick to the red line and are driven by interests to take risks.The enterprise leaders take risks to organize illegal production,which leads to accidents.It also reflects that coal shock pressure,coal and gas outburst and water damage are still major risks of coal mine safety.

　　Epc casting process is generally a new casting method in which the surface of the processed plastic foam pattern is coated with a certain thickness of fire-resistant coating,and then put into a sand box.Self-hardening resin sand is adopted to make solid shape outside,and pouring is done under negative pressure to vaporize the pattern,and liquid metal occupies the position of the pattern,and the casting is formed after solidification and cooling.　　Although disappearing mould technology is a relatively advanced environmental protection public welfare,but there will be many problems,mechanical sand is one of them.　　Mechanical sand performance　　Mechanical sand is also known as"iron-clad sand",which means that molten iron penetrates into the pores between the sand grains and mechanically sticks the sand grains to the surface of the casting after solidification.　　1,between the coating and molding sand parts of the mechanical sand,sand exposed to the surface,most of the slope.　　2.A uniform layer of"iron-clad sand"is adhered to the surface of the casting.　　The cause of mechanical sticking sand　　There are two reasons for***defects:　　1.In order to ensure the uniformity of the casting wall thickness,the sample designer designs a structure that is not easy to grind sand or cannot grind sand,and even presents a very narrow hole cavity in the pattern.　　2,the negligence of the model worker.　　The causes of the second type of defect are also two aspects:　　1,the composition of the composition,the type of coating aggregate,fire resistance and mutual ratio,the coating layer thickness requirements and anti-sand effect is very influential;　　2,layer thickness,coating thickness is too large,labor cost materials;Coating thickness is too small,high temperature liquid iron will penetrate through the coating sand particle gap,resulting in sticky sand.　　Mechanical sand prevention　　The main preventive measures are as follows:　　(1)strictly review the pattern structure casting engineers in the pattern structure review,must carefully analyze whether the pattern structure is reasonable,for the impact of paint coating and prevent the unreasonable structure of sand compactor to be completely eliminated,in order to facilitate workers to work.　　(2)to strengthen the monitoring of molding ground-up sand quality with full-time staff to manage the quality of the process,and the implementation of the whole process of ground-up sand quality tracking,supervision and inspection.　　(3)strict coating preparation and coating quality,especially on the coating layer thickness monitoring,because of material,because of parts,because of time to carry out strict and flexible operations,to ensure that the coating to meet technological requirements.　　(4)to strengthen the education of quality awareness,timely analyze and summarize the causes of the above-mentioned sand sticking defects of castings,and call relevant responsible persons to conduct on-site analysis of the defects.　　(5)the incentive mechanism shall be adopted to quantify the severity and quantity of defects,and the relevant responsible person shall be given certain economic penalties.

　　Sand mold casting technology is a casting method of sand as the main molding material to prepare mold,is***traditional casting method.Due to its own characteristics(not subject to the shape,size,complexity and type of alloy***,production cycle is short,low cost),so sand casting is still a wide range of casting methods used in casting production,especially single or small batch casting!　　Today to introduce the sand mold casting process***basic eight processes:sand distribution,molding,core-making,melting,pouring,cleaning,processing,inspection.　　A,with sand　　Molding sand and core sand need to be prepared in the sand distribution stage for molding.Generally,sand mixer is used to stir the old drawing and appropriate amount of clay.　　Second,the system of touch　　In the stage of mold making,molds and core boxes are made according to the drawings of spare parts.Generally,wooden molds and mass production can be used for individual pieces to make plastic molds or metal molds(commonly known as iron or steel molds),and mold plates can be made for mass castings.Now the mold is basically using engraving machine so the production cycle is greatly shortened,the mold generally needs 2~10 days.　　Third,core making　　Modeling(core making)stage:including modeling(forming the cavity of casting with molding sand),core making(forming the inner shape of casting),mold making(putting the nixin into the mold cavity and closing the upper and lower sand boxes).Molding is the key link in casting.　　Four,melting　　Melting stage:according to the required metal into the distribution of chemical composition,select the appropriate melting furnace alloy material,the formation of qualified liquid metal liquid(including qualified composition,qualified temperature).Cupola or electric furnace are commonly used in smelting.　　Five,pouring　　Pouring stage:the molten iron from the electric furnace is poured into the finished mold with a molten iron bag.The pouring speed should be paid attention to so that the molten iron can fill the whole cavity.In addition,pouring iron is more dangerous need to pay attention to safety!　　Sixth,to clean up　　Cleaning stage:after pouring,after the molten metal has solidified,take a hammer to remove the gate and shake out the sand of the casting,and then use a sandblasting machine for sandblasting,so that the casting surface will appear very clean!On the requirements are not strict casting blank after inspection can be basically out of the factory.　　Seven,processing　　Casting processing,for some special requirements of casting or casting can not meet the requirements,may need to be simple processing.Generally,grinding wheel or polishing machine is used to remove burrs and make casting more bright and clean.　　Eight,inspection　　Casting inspection,casting inspection is generally in the process of cleaning or processing stage,the unqualified have been found out.However,there are some casting requirements,which need to be checked again.For example,some castings require a 5 cm shaft to be inserted through the center hole.