Analysis of explosion proof structure principle of cylinder scale

Analysis of explosion proof structure principle of cylinder scale

Flammable and explosive gases or dust endanger the life and property safety of enterprises and employees. Therefore, enterprises need to prepare for a rainy day and equip explosion-proof electronic scales at key positions such as production and storage.

When purchasing and using explosion-proof weighbridge truck scale, we often come into contact with several related terms, such as intrinsically safe type, flameproof type and increased safety type. In order to distinguish and correctly select the right type of explosion-proof weighbridge, it is necessary to first understand the relevant explosion-proof classification knowledge stipulated by the state.

Principle of intrinsically safe cylinder scale weighing scale:

Intrinsically safe cylinder scale weighing scale is different from flameproof type and increased safety type. It is the only type of explosion-proof equipment that can be applied to zone 0. There may be a certain amount of electric spark or explosion in the process of opening, closing and using the cylinder scale. The intrinsically safe cylinder scale can limit the two factors that may cause explosion, namely, under normal working and fault conditions, when the energy of electric spark or thermal effect produced by the weighing instrument is less than the preset energy, it will not cause gas explosion.

Mark of intrinsically safe cylinder scale:

The explosion-proof sign is capital English letter ex. Explosion proof weighbridge truck scale usually needs three parameters to identify whether there is explosion danger in a place and the degree of explosion danger, and according to the comprehensive attribute value of these three parameters to determine the explosion risk level of this place.

Explosion proof weighbridge truck scale may produce explosion range: that is, the frequency or duration of dangerous gas or dust in a certain area;

Explosion proof electronic scale weighing scale may produce explosion medium: that is, the type and explosion concentration of dangerous gas or dust that may appear in a certain area;

Explosion proof electronic scale weighing scale may produce explosion temperature: that is, ignition temperature of dangerous gas or dust that may appear in a certain area.

Therefore, the explosion-proof signs need to use different symbols after ex to express the applicable area, gas category and temperature level of the platform scale weighing scale.

The scope of these three types of explosion may be divided into IA and IB according to the safety degree of the place of use or the connected place.

Class IA means that the explosive gas mixture cannot be ignited under normal operation, one counting fault and two counting faults. That is to say, class IA instrument will not produce safety failure even if two counting failures are considered at most.

Class Ib means that the explosive gas mixture cannot be ignited under normal operation and a counting fault. Obviously, the safety level of class IA instrument is higher than that of class Ib instrument. Class Ib instrument will not produce safety failure when only one fault occurs, but if the second counting fault occurs, it may produce safety failure. According to the frequency and time of gas volatilization, it can be divided into zone 0, zone 1 and zone 2.

Medium that may produce explosion: cylinder scale according to the provisions of "electrical equipment for explosive gas environment Part 1 General requirements" formulated by the state, intrinsically safe explosion-proof platform scale can be divided into class I and class II: class I is intrinsically safe explosion-proof instrument for coal mine; class II is intrinsically safe explosion-proof weighing instrument for factory, which is further divided into class A, class B and class C according to different properties of gas.

Possible explosion temperature: the temperature here represents the maximum allowable temperature of explosion-proof electronic scale weighing scale surface. The temperature level of the equipment must be lower than the ignition temperature of combustible materials used in the dangerous environment. According to the relevant national regulations, it is divided into six levels, namely T1, T2, T3, T4, T5 and T6. T1 means the safety temperature when the maximum surface temperature of explosion-proof weighbridge is less than 450 ℃; T2 means the safety temperature when the maximum surface temperature of explosion-proof weighbridge truck scale is less than 300℃; and so on: 200℃, 135℃, 100 ℃ and 85℃.

National standards gb3836.1-2000 electrical equipment for explosive gas atmospheres Part 1: General requirements (EQV IEC 60079-0:1998) and gb3836.4-2000 electrical equipment for explosive gas atmospheres Part 4: intrinsically safe "I" (EQV IEC 60079-11:1999).

At present, the steel cylinder scale weigh scale is certified by the national instrument explosion-proof supervision and inspection station. The national instrument explosion-proof supervision and inspection station is the unit that performs the safety supervision and inspection of domestic and imported instrument explosion-proof products, and has obtained the mutual recognition of explosion-proof certification technology with the United States Factory Joint Research Association and the German Federal Institute of physical technology.

The following are the structural features and application requirements of the cylinder:

1.To save space, the steel cylinder scale weighing scale with frame structure can use the lower air part to set up the protruding arc of the circular side of the steel cylinder when placing the steel cylinder.

2.Cost saving. In fact, cost saving for businesses means cost saving for users. With the development of society, every user wants to buy a good weighing system, but the price is also low, and the quality is also required to pass, so businesses not only need to make a breakthrough in technology, but also look for a stable and practical method in structure. This method not only ensures the quality, but also saves the purchase cost for users.

3.It is easy to clean. Generally, the leakage of liquefied gas should be considered in the steel cylinder scale weighing scale, and the structure that is easy to clean must be made. Therefore, in order to keep clean, the structure that can be cleaned from multiple angles must be kept, so that the scale body can keep a new look at all times.

4.It's convenient to carry and place. A frame scale weighing scale can be easily moved and stacked together, so it's very convenient to carry in batches, save huge space and reduce the gravity load.

Therefore, it can be known that the electronic cylinder scale weighing scale does not have to be a frame structure, but the frame structure has many advantages; such design is to meet the needs of users, meet the user experience, the effect is good, from the perspective of users, such design is also an inevitable trend.