Stop messing around with your chair lift and get blown up.

Even though the Spring Festival holiday is over and office workers start to go to work, they still have to stay safe because the chair lift can explode. Why? Now most of the company's office equipment is the use of air lift chair, but the small air pressure chair also implies security risks of explosion, do not sit on the chrysanthemum mountain.

A review of the chairlift explosion

1. On the evening of April 20, 2007, Dinghai District, Zhoushan City, Zhejiang Province, an explosion occurred in the chair Ms. Lou was sitting on, which tore through the seat and made a big hole in Ms. Lou's pants. A large number of debris, including hard plastic, wood chips, sponges, cloth and sealing rings, collapsed into Ms. Lou's body up to 10 centimeters.

2. On the night of November 26, 2007, the air pressure chair that Mr. Wu, 68 years old, was sitting in Yantai Development Zone exploded, causing serious injuries to his hips, legs, rectum, anal canal and small intestine.

3. On the night of March 26, 2008, the computer chair of a Mr. Lin's home in Ganzhou City, Jiangxi Province suddenly exploded. Mr. Lin suffered injuries on his back and hands, and a small iron rod about 15 centimeters long was blown up to the ceiling.

4. On January 14, 2009, Xiaogang (a pseudonym), a 14-year-old boy in Jiaozhou, Shandong Province, was surfing the Internet alone at home. When adjusting the lift of an air pressure chair, a sudden explosion occurred.

5. At around 9:30pm on May 12, 2010, a loud noise was heard from a rented house in front of Huldian, Xiamen. A woman was injured by a chair lift that suddenly burst. The lifting rotary chair suddenly explodes, and the impact force sends the screws and small gaskets in the chair into the body like bullets from the buttocks. The pressure bar of the chair lift was inserted into the victim's anus. The woman fainted at the scene. Fortunately, after more than five hours of surgery, all the parts of the chair were removed and Liu survived. This is the chairlift that burst and hurt people. The seat burst in the middle. The pressure rod inserted into the injured woman's anus was more than 20 centimeters long.

6. An accident occurred in an office building on Huaqiao Road in Nanjing. A rotary pneumatic chair used for office in a company suddenly exploded, injuring the buttocks of the hostess. As soon as this incident happened, many employees were shocked: did not expect to sit under the butt a "time bomb". The woman, who works for a travel company, was sitting at her desk during her lunch break and did not make a big move when the chair exploded and the woman fell to the floor screaming. Sent to Jiangsu Hospital of Traditional Chinese Medicine emergency surgical treatment. From a surgeon of the hospital that learned, the woman for the gas explosion injury, jeans are blown out, resulting in perineum and the inner thigh of many ruptures, injuries are not minor. After debridement and anti-inflammatory treatment, she is under observation and treatment. It is understood that the air pressure chair explosion injury incidents in other places from time to time, two years ago, a Shanghai citizen was injured by the air pressure chair, hemorrhagic shock, blood loss of more than 2000 ml. After a comprehensive examination, the results were very shocking: the injured's anal rectum was seriously damaged, the small intestine was broken, and there was a 5cm wound. After detrauma, a total of more than 20 sundry objects were removed, including spring wire, sponge, wood chips, screw cap and a steel bar. The steel was as thick as a finger and 16 centimeters in length. It was shot through a blunt end, and the entire steel was shot into the body, indicating that the explosion was very powerful.

7. In May 2010, a woman in Fujian Province was seriously injured in an explosion of a pneumatic chairlift, which caused her to fall into a coma on the spot. Her buttocks were injured, her rectum was torn and her vagina was pierced. After checking the chair's purchase receipt, there is no factory name, address, phone number and other information.

8. Kobayashi, 24, was sitting on a rotating chair to blow out her hair when the chair exploded and a screw entered her anus and exited her uterorectal rectum. After surgery, doctors removed numerous screws and pieces of plastic from her body and buttocks. Doctors said that fortunately, the screws that passed through his body did not hurt any vital organs, and Xiao Lin is out of danger after surgery.

Frequent chair lift explosions cause concern

Rough estimates suggest that an average person will spend more than 40,000 hours sitting in a computer chair or work chair, an office worker will spend more than 60,000 hours sitting in a work chair, and an IT practitioner will spend more than 80,000 hours sitting in a work chair. In the past two years, in Xiamen, Yantai, Zhoushan and other places, the computer chairlift suddenly exploded causing injuries to users of the case frequently seen in the news.

Then in the future of work and life, how to prevent or avoid this kind of things? How to choose a safe and reliable chair lift? Let's take a look.

The explosion of the chairlift caused severe injuries to users caused by a large amount of debris including hard plastic, wood chips, sponges, cloth and sealing rings. Small chairlift are hidden so much risk, that how to choose the chairlift, the correct use of chairlift, need to cause the attention of office workers.

Reason: The material is shoddy to hide hidden dangers

Why did a seemingly safe chair lift explode? Industry insiders told reporters that the lifting of the chair is mainly achieved by the lifting device at the lower part of the chair surface. The current lifting device is mainly divided into three categories: oil pressure, mechanical type and air pressure. Pneumatic chair lift is the most common chair lift.

The pneumatic lifting chair has a pneumatic bar, the pneumatic bar is a kind of gas and liquid as the working medium, can support, buffer, braking, height adjustment and Angle adjustment and other functions of the elastic element, its basic principle is filled with high pressure nitrogen, because the piston is provided with a through hole, the piston at both ends of the gas pressure is equal, and the cross-sectional area on both sides of the piston is different, One end is connected with the piston rod and the other end is not. Under the action of gas pressure, the pressure to the side of the small cross-sectional area is generated, that is, the elastic force of the pressure bar. When people sit on the lifting shaft, the lifting shaft will gently decline, with uniform speed, and can be reduced to the lowest point. Do not give the lifting shaft external force, lifting shaft rise back to the highest point. It is understood that regular manufacturers are using nitrogen filled pressure rod, the concentration is generally more than 99%, the pressure is about one or two atmospheres.

Normally, the rods, which are similar to bicycle pumps, are filled with nitrogen, a highly pure inert gas. When a person is sitting in a chair, although the pressure of nitrogen is increased, it is still within the limit of pressure expansion, and no problem will occur. However, some inferior pressure rods often have problems such as insufficient nitrogen purity and shoddy gas rod material. In the case of high temperature in summer or frequent seat ups and downs, the pressure inside the pressure rods will rise sharply, which is more likely to cause explosion.

The pressure bar market is a mixed bag

Reporters in Guangzhou Avenue south of a furniture city to see, there are a lot of sales of chair lift shop. Swivel chair prices also range from one hundred yuan to several hundred yuan, the chair is a variety of styles. In these shops, in addition to all kinds of swivel chairs, the shops are almost without exception stacked with chair backs, chair seats, turntables and other accessories. Swivel chairs are assembled from accessories on site and sold on the spot, whether in furniture stores or corner stores, merchants say. Every day, the merchants need to buy a variety of accessories, mainly pressure bars, pulleys, seat armrests.

"Most of the barometric bars on the market now are made in Guangdong." One merchant says it takes only a minute to assemble a chair, with a few accessories simply inserted and fixed. And these accessories, the most important is the pressure bar. But the reporter visited the market found that the pressure bar on the market is now sold as fish eye mixed bead, the quality is uneven, qualified pressure bar and no manufacturer logo pressure bar, the price difference is dozens of times. Usually a pressure bar is sold at about 30 to 40 yuan, or even hundreds of yuan, but the cheapest pressure bar is only sold at 4 to 5 yuan.

Some merchants say there will be a market for inferior pressure rods, mainly because of the price. In order to reduce costs, some small workshops do not consider safety issues, they use a cheap but hidden pressure rod, once the explosion is very powerful, can kill or injure.

The air lift was a powerful explosion

Once the air lift explodes, how powerful is it? Wang Zhanlin, a professor at the School of Automation Science and Electrical Engineering at Beihang University, conducted a simulation experiment. Professor Wang said, according to the calculation, under normal circumstances, when the pressure bar under the chair to bear a person's weight, the air in the pressure bar will be compressed, then the pressure inside will reach about 24 atmospheres, once the explosion, the 24 atmospheric pressure multiplied by the bottom area of the piston in the oil pipe, is the power of the pressure bar up instant explosion. The force is about 70 to 80 kilograms. The force of 24 pressures is enough to punch through at least six density plates, compared to a body of flesh and blood.

Points for attention when using the chair lift

Experts remind, consumers in the purchase of this kind of air lift chair, must choose regular products marked with manufacturer information "gas purity of more than 90% can ensure safety, but some black factories in order to save money, irrigation is high pressure air, the safety of this chair is relatively poor." In addition, the following points should also be paid attention to in the daily use of the chair lift:

1. No steel plate chair can be installed by itself

When the chair is overturned, if the inspection finds that there is a "slanting empty hole" on the bracket steel plate below the chair seat surface and opposite to the axis of the supporting steel pipe, a steel plate (commonly known as iron plate) with a thickness of about 2 mm can be fixed with screws to cover it to resist the accidental shooting of the screw, etc.

2, do not repeatedly lift the seat, sit hard

Many people in the chair lift, like to move to move, or repeatedly lift, chair slide to slide, these sitting method is very dangerous, easy to cause uneven pressure rod, long time pressure rod will be uneven wear, the formation of explosion hidden danger.

3, there are problems do not disassemble themselves

Any item has a normal life span. Every once in a while to check their own chair, lift chair cracks, loose, or shaking, should be timely maintenance and replacement, so as not to lead to tragedy.

Choose to look for regular manufacturers

A sales pressure pole business Mr. Zhang told reporters, in addition to their own business in this small shop, usually he also supplies to large furniture city. When choosing a pressure rod, he would first choose a regular manufacturer, and would also go to the manufacturer to spot check the quality of the pressure rod from time to time to see whether the manufacturer injected nitrogen rather than high-pressure gas in accordance with the contract.

The explosion of the pressure rod was caused by frequent rotation and lifting? Mr. Zhang said that generally qualified pressure rod does not exist this problem, the domestic pressure rod lifting times of the detection standard is 120,000 times. According to the standard weight of an adult, the pressure bar from the highest pressure to the lowest, continuous impact 120,000 times, no problems, such a product is qualified. Therefore, we must choose regular goods when buying.