Lift chair computer chair explosion? ! The office family sitting in the chair lift had to look

[Office Partner Information Center] The chair lift is a new type of chair. Nowadays, the chair is basically used in the office. Because of its own principle and material, it leads to the relationship between some bad manufacturers. Sometimes there are certain hidden dangers. However, because the chair itself has many advantages, it is still very popular. It is helpful to know some information about the explosion of the chair lift.

Lift chair Computer Chair explosion? ! The office family sitting in the chair lift had to look

First, the types and characteristics of chair lift

Literally, the chair is a chair that can be raised and lowered in height. It is generally divided into pneumatic, hydraulic and mechanical. At present, pneumatic lift chairs have a high market share. The adjustable function of the pneumatic lift chair is achieved by the gas spring components therein.

Pneumatic chair

So how does the pneumatic chair lift achieve height adjustment? Xiaobian explained here that the gas spring is a kind of elastic element that uses gas and liquid as the working medium, and can function as support, buffer, brake, height adjustment and angle adjustment. It is composed of pressure pipe, piston and piston rod. Several couplings are composed. The working principle of the pneumatic lift chair is to press an inert gas, such as nitrogen, into the closed cavity to make the pressure in the cavity larger than atmospheric pressure, and use the pressure difference to realize the movement of the piston rod, thereby achieving the function of adjusting the seat.

Hydraulic chair

The hydraulic lift chair is often used in special occasions such as a barber chair, and the use of a driving force by a third person outside the user is required to realize the lifting function of the chair. The hydraulic lifting mechanism is the principle of the hydraulic jack. Because the hydraulic lift chair is expensive, the structure is relatively complicated, and the height adjustment is not sensitive enough, and the market share is low.

Mechanical chair

In addition to the pneumatic lift chair, there is also a mechanical lift chair, that is, a supportive seat is a threaded solid steel rod. When the computer chair needs to adjust the height, the chair needs to be lowered, and the bolt of the fixing bolt is fixed. After loosening, adjust and then screw on.

Compared with mechanical chair lifts, pneumatic lift chairs are relatively inexpensive to manufacture and easy to use, so the market share is relatively large. However, the safety of a pneumatic lift chair is not as good as that of a mechanical one. The lifting chair explosion accidents that have occurred in recent years in China are all pneumatic lift chairs.

Second, what causes the explosion of the pneumatic lift chair?

Generally speaking, the following two conditions may cause an explosion: First, the thickness of the gas spring wall is uneven or the preload is too large. Second, frequent high and low adjustments and rotations lead to overheating explosions.

Under normal circumstances, this gas pressure rod similar to a bicycle pump is filled with a high purity inert gas nitrogen. When a person sits on a chair, although the pressure of the nitrogen is increased by the extrusion pressure, it is still within the limit of the air pressure expansion, and no problem occurs. However, some inferior gas pressure rods often have problems such as insufficient purity of nitrogen gas and sub-charge of gas rod material. In the case of high temperature in summer or frequent lifting of seats, the pressure in the gas pressure rod suddenly rises, which is easy to cause an explosion. Some black manufacturers use low-pressure air instead of inert gas to reduce the cost, which makes it easier to explode the gas pressure rod.

In addition, some consumers have safety hazards when using the pneumatic chair lift, such as excessive force when sitting, or often adjust the lifting handle.

3. How big is the explosive power of the chair lift?

According to the calculation, under normal circumstances, when the air pressure rod under the chair bears the weight of one person, the air inside the air pressure rod will be compressed, and the air pressure inside will reach about 24 atmospheres. Once the explosion occurs, the 24 atmospheric pressures The area of ​​the bottom of the piston in the outer tubing is the power of the bursting of the pneumatic rod. This power will reach 70 to 80 kilograms.

In the experiment, when the atmosphere was compressed to about 7 atmospheres, the air pressure was instantaneously released, and the ejector rod in the piston was ejected, and a MDF was placed not far from the front end of the ejector to simulate the surface of the chair. As a result, the MDF, which is about three or four millimeters thick, is easily broken down. In the second set of experiments, they increased the thickness of the MDF and placed two MDFs. As a result, the MDFs were also unable to withstand the impact of 7 atmospheres.

Experiments have shown that the power generated by 24 air pressures can penetrate at least 6 MDFs, and the power is amazing. It is because of the strong pressure that it has produced such tremendous destructive power.

Fourth, how to choose a safety chair?

1. Purchase regular manufacturers' products.

When consumers purchase such a gas lift chair, they must choose a regular product that indicates the manufacturer's information. Don't try to buy three no products at a cheap price, otherwise not only the quality can't be guaranteed, but also there may be no right to defend the rights when there is a problem. At the time of purchase, consumers should pay attention to check whether the product has a certificate of conformity, registered trademark, manufacturer name and address.

2. Carefully choose a chair that is too cheap.

According to industry insiders, all the chair lifts sold by regular manufacturers will issue an “inspection report”. For gas pressure rods with a certain risk factor, the pneumatic rods are made of steel and high purity gas, and the gas is applied. Strictly sealed; at the upper end of the gas pressure bar, there are also signs printed by the relevant national authorities, and the manufacturer, the type of pneumatic rod and the prompts are written in English. Generally, there will be an explosion situation, and the chair lift uses a poor quality gas rod produced by a non-formal manufacturer.

3. When purchasing the chair lift, you can check whether there is a product's qualified mark on the chair or the box and the basis for compliance.

Since the general air lift chair has a warranty period, consumers should remember to ask the merchant for an invoice when purchasing, so as to avoid lack of credentials when defending rights.

4. Try it out.

When you buy, you can try to adjust the seat to see if it is smooth. It is recommended to purchase a chair with a smooth adjustment.

5. How can I use the pneumatic lift chair correctly?

1. Do not adjust and rotate the chairlift frequently. Many people like to move when they are in the chair lift, or repeatedly lift and lower. These sitting methods are very dangerous, and it is easy to cause uneven pressure on the gas pressure rod. When the gas rod is used for a long time, the pressure rod will be unevenly worn and form an explosion hazard.

2, do not arbitrarily disassemble the chair, especially the gas spring parts, if you need to repair, please find a professional. Some people think that the interior of the chair is filled with gas, so they disassemble and release the gas. The self-demolition chair lift on the Internet is used for deflation. Consumers should not follow suit to avoid danger. A lot of information on the Internet is not authoritative, and ordinary consumers are prone to accidents during the disassembly process due to lack of professional knowledge. If there is a problem with the air lift chair, be sure to ask a professional service person for repair.

3. Regularly inspect and maintain the chair lift. If it is found that the adjustment is not smooth or there are other abnormal phenomena, it is recommended to suspend the use and seek professional maintenance. Any item has a normal life. Check your chair every once in a while, the chair is cracked, loose, or shaken, and it should be repaired and replaced in time to avoid a tragedy.

4. When using the chair lift, do not sit on the front edge of the chair frequently to avoid the chair being damaged by the twisting force.

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