On August 2, 7 37 points in the morning, at a time when the factory starts or shift time, kunshan in jiangsu development zone of a taiwan-funded background metal products company a serious explosion accident, as of the day 22, is it has killed 69 workers were killed, more than 120 workers were injured. Small make up at here! In addition to paid what can we do?
If someone asks what does this have to do the party with us, hereby nahum small make up to refute: why no relationship? Born in the marketization of the division of labor society, isn’t it bus travel, what’s more, more and more Chinese families to have a car. So, you know, the fine aluminum alloy wheel hub on your car, it is by what we see in the news today these victims compatriots with sweat in exchange for come back! It’s never too late to mend. Hon small make up will organize science related plant dust explosion prevention knowledge sharing, and combining the hong han robot company, introduces the application of industrial robot polishing workshop. Can’t rushed to the scene to participate in the rescue, or “messed up” is ashamed, then at least spread valuable information and knowledge, don’t let our souls like body numb!
The party accident polishing workshop business introduction
The scene of the accident, is the aluminum alloy wheel polishing workshop, the workshop is for car travel is necessary in our daily life important parts processing, aluminum alloy automobile wheel polishing of aluminum alloy wheel hub assembly car before the middle of a process, in order to make the wheel surface is bright and clean and bright. Aluminum alloy wheel hub with its beautiful and easy, safe and comfortable etc. Won the more the favour of many private car owners. Now, almost all of the new models of aluminum alloy wheel hub has been adopted, and many owners friends also use the original car wheel hub for aluminum alloy wheel hub.
Aluminum alloy wheel polishing, general with wool polishing wheel or sponge polishing wheel polishing machine drive rotation, add in the wheel hub surface after polishing wax repeated friction, reduce workpiece surface roughness, in order to obtain bright and smooth surface. Polishing machine is divided into semi-automatic and fully automatic and manual several levels. Automatic polishing is used without artificial direct operation by the workpiece complete polishing machine (such as the currently used robot polishing system abroad: robot grasping polishing machine in workpiece surface active polishing operations.)
Many manufacturing enterprises in China, because of the restriction of technology and equipment level, as well as in previous years cheap Labour market guidance, many enterprises preferred way of semi-automatic or manual polishing using artificial participation. Is according to the reason of casualties, the factory workshop is likely to be using the total artificial way of manual polishing — that is divided into several groups in the same workshop polishing operations, each carrying a portable polishing machine for aluminum alloy wheel hub polishing operations, polishing wax, wax, wheel hub of handling are artificial.
Polishing operation site is one of the technology of manufacturing environment is very bad, because the polishing wheel and the workpiece friction, will produce the dense dust particles suspended in the workshop, in bad ventilation and protective measures of the scene, when many workers start polishing operation, the scene can be used “severe dust weather” describe, attention! Floating particles is aluminium magnesium alloy and industrial wax and other metal ions, compounds and toxic gases, etc. In addition, many polishing machine working together to produce high strength friction noise, the continuous high intensity factors such as physical labor bring fatigue, is unbearable.
A little familiar to kunshan knows, in suzhou prefecture in a county-level city, adjacent to Shanghai in recent years, the rapid development of the basic dependence is given priority to with compatriots to investment by Taiwanese firms. Taiwan companies to invest in kunshan factory, it is because of cheap land and policy, cheap labor, such as the vast mainland market resources, and investment in the factory is basically highly labor-intensive manufacturing enterprises. At the same time, dealt with the Taiwanese people all know, the Taiwan businessmen are notoriously stingy, the mainland legal system and imperfect market supervision of today, many sweatshops universal existence is not a slogan with speech get negative.
About the enterprise and polishing business is introduced to this, the above described passing friends can not be taken as seditious speech treatment, we to wash to recognize the objective reality and recognize the fact that at the same time also want to find a way to improve and take action. The fellow workers living environment, have to rely on our own efforts to improve!
【 plant dust explosion hazard characteristics 】
1. The factory dust explosion characteristics:
(1) multiple explosion is the biggest characteristic of dust explosion. Dust in the industrial production field is a certain scale, and are characterized by concentrated in space and time. Blast wave for the first time, the deposition in equipment or dust blowing it on the ground, in a short period of time after the blast explosion center will form a negative pressure, the fresh air around it outside-in fill, mixed with the raise of dust, which triggered secondary explosions. Secondary explosions, dust concentration is higher.
(2) the minimum ignition energy required to dust explosion is higher, generally over decades millijoule. Factory production, often accompanied by factors such as electricity, open flames, and subject to factory workshop conditions, usually accompanied by high temperature, high dust workshop unfavorable factors such as difference of gout.
(3) compared with combustible gas explosion and dust explosion pressure rise is slow, long time high pressure, the energy released is big, strong destructive power. Space is relatively limited in factory workshop, the release of the explosion pressure of space is also accompanied by one of the unfavorable factors.
2. The main harm
(1) with a strong damaging. Involving a wide range of dust explosion, coal, chemical, pharmaceutical processing, wood processing, food and feed processing departments are often happened.
(2) easy to produce secondary explosions. The first blast wave rolled up the dust on the negative pressure “return wind” mix, embers ignition under the second explosion. Secondary explosive power is much bigger than the first time.
(3) can produce poisonous gas. A carbon monoxide; Another is explosives (such as plastic) its own decomposition of toxic gases. Gas generation often after an explosion caused by a large number of people and livestock poisoning casualties, must full attention.
3. The accident case
Only industrial and agricultural areas in the United States, between 1913 and 1973 is 72 times more serious dust explosion accidents happened.
1952-1979, 209 kinds of dust explosion accidents occurred in Japan, casualties, a total of 546 people, among them with crushing, powder and dust separation engineering is more prominent in 46.
1965-1980, the federal republic of Germany 768 various types of dust explosion accidents occurred, the more serious is the wood powder and wood dust explosion accident and grain feed, 32% and 25% respectively.
From below the momentous dust explosion accidents occurred in recent years in China, accounts for the vast majority of aluminium magnesium alloy dust, as well as the kunshan factory aluminum alloy polishing cause the cause of the accident (general for magnesium alloy aluminum alloy wheel hub, polishing the dust containing high concentrations of aluminum magnesium alloy particles)
The influence factors of dust explosion analysis 】 【
Dust and dust explosion is closely related to the chemical and physical properties: physical heat of combustion, strong oxidizing, easy to charged, containing volatile matter concentration, its dust explosion, the greater the risk; The rules the more active the dust particle, the more easily adsorbed oxygen in the air, the more easy explosion; Over lower explosive limit of dust concentration of dust explosion in satellite coefficient is higher. Kunshan plant explosion scene is at a high polishing aluminum alloy products workshop dust environment.
1. The principle of dust explosion:
Dust explosion, dust within the scope of the explosion limit, in the heat source (open flame or temperature), flame instantaneous spread to the whole mixed dust in space, the chemical reaction speed, release a large amount of heat at the same time, the formation of high temperature and a lot of pressure, the energy of the system is converted into mechanical work, as well as light and heat radiation, has a strong destructive power.
Dust explosion test (experiment course in junior high school students) : danger, do not imitate!
2. The dust explosion conditions
(1) the concentration of combustible dust with appropriate suspended in the air, the formation of dust cloud;
Explosive dust are: metal (such as magnesium powder, aluminum powder); Coal; Food (such as wheat, starch); (e.g., blood meal, fish meal feed); Agricultural and sideline products (such as cotton, tobacco); Forest products (e.g., paper powder, wood powder); Synthetic materials (such as plastic, dye).
(2) there is plenty of air and oxidant;
(3) there is fire or strong vibration and friction.
In actual production, we can’t risk through reforming process and material to replace time high production process, but at least can take necessary measures in prevention and protection, and strictly enforce the process flow and field management standard, can’t make fun of life.
Precautions 】 【 factory production high dust environment
If use effective ventilation and dust control measures, no smoking and open flame. Relief valve or other device is installed in the equipment shell, the explosion suppression system, etc. For workshop, with dust explosion hazard must be conducted in strict accordance with the level of explosion-proof technology design, and set the ventilation, dust exhausting system alone. Always wet cleaning workshop and equipment on the ground, to prevent dust float in the sky and gathered. Guarantee system should have very good sealing, if necessary, of combustible dust in airtight containers or pipe filled with nitrogen, carbon dioxide and other gases, in order to reduce the content of oxygen, suppress dust explosion.
The robot polishing system reliability and the feasibility of automatic polishing technology.
Combining the above analysis, we see that in the polishing aluminum alloy products workshop protection is absolutely possible, such as dust collecting device (cloth bag dust collector, dust cleaner), atomizing nozzle humidifying dust, ventilation equipment use and operation of space segments, fire control and supervision and so on.
In the modern industry, explosion-proof measures and give powder environment we do not only consider a certain equipment alone, should start from the whole, as an explosion protection system engineering to design, so often need to take a variety of composite applications. Such as discharge and mechanical isolation scheme, discharge and chemical isolation scheme, flameless discharge and mechanical isolation scheme, the flameless discharge and chemical separation solutions, restrain and mechanical isolation, etc., may also need an aggregate of all solutions.
In numerous solutions, robot polishing, this robot to replace manual polishing homework, reliability requirements for the environment to reduce a lot, at least can reduce dust explosion is so bad for field personnel casualty risk, reduce dust to the human body health hazard. Robot polishing operation and polishing machine, automatic loading equipment of attachment, not only realized the full automation of the polishing process, and the effective protection of the duplication of the reliability of the consistency and quality of work:
Highly automated: robot precision control by computer, through computer simulation programming mode or handle teaching mode, realize the automatic management of polishing operation, can simulate highly artificial polishing action and ensure consistency, robot movement can be adjusted according to the production need to be flexible, and minimize footprint factory space;
2. Quickly adapt to multiple batch job switching between products: robot different from ordinary semi-automatic polishing machine, can be set different polishing applications, in view of the different batches of the workpiece and the requirements of flexible call the corresponding action set, after the replacement of products specifications, only button can be selected, convenient and fast;
3. High flexible manufacturing reuse: after the workpiece breed even process application change, robots still reusable: most of the tooling needs to be replaced. Such as polishing robot by robot can be updated to handle, you just need to change the flange at the end of the polishing variant for the gripper can;
4. High-precision standardization work, the robot is controlled by computer, repetitive motions homework, homework circulation space positioning error between < + / - 0.08 mm, repositioning precision of the ideal and work cycle control, make robot work kept good consistency, guarantee the standardization of products with the percent of pass; 5. Low environmental requirements: robot protection levels up to IP65, dust can completely adapt to the environment operation, normal operation in the 0 ~ 55 ℃ environment; 6. Continuous operation without fatigue: robot 24 hours of continuous operation, don't need to have a rest, the factory can continuous production, expanding production capacity, improve the efficiency of unit production, shorten the delivery time; 7. Low maintenance and high life: robot polishing system suitable for continuous operation and the average between failures reach more than 75000 hours (about 8 years), maintenance interval of more than 20000 hours (about 2 years). 8. Easy operation easy management: the use of simple and convenient operation, easy to manage.
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