If you are a new entrant in the industry, you must have such questions: what are the models of
double-girder overhead cranes? How to choose cranes of different tonnages and models? This article will introduce them in detail to help you understand different models of double-girder overhead cranes and how to choose them for different usage scenarios.
We often see designations such as QD, QZ, QC, QB, QN, etc., which represent different models of double-girder overhead cranes.
The following will introduce the meaning of each letter and the application scenarios of each model one by one.
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Q: It is the first letter of the pinyin of "Qi" (lifting) in Chinese, representing a crane.
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D: It is the first letter of the pinyin of "Dong" (moving) in Chinese, representing an electric hoist or electric drive.
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Z: It is the first letter of the pinyin of "Zhua" (grab) in Chinese, representing a grab bucket (a device specially used for picking up objects).
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C: It is the first letter of the pinyin of "Ci" (magnetic) in Chinese, representing an electromagnetic chuck (a device that can adsorb objects through magnetic force).
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B: It is the first letter of the pinyin of "Bao" (explosion-proof) in Chinese, indicating that the product can be used in flammable and explosive environments (such as chemical workshops, oil depots, factories with more dust). All electrical components and mechanical parts of such products have undergone explosion-proof treatment to avoid dangers caused by friction during equipment operation.
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N: It is the first letter of the pinyin of "Nai" (insulation) in Chinese, indicating that the product can be used in live working environments, such as transporting high-value equipment in substations, to prevent high-voltage current from being conducted through the crane, resulting in electric shock to personnel.
The above has introduced the meaning of each letter. Next, we will introduce the common models encountered in daily purchase and their main uses.
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QD type: General overhead crane (most commonly used)
QD type double-girder overhead cranes are mainly used in workshops, warehouses and other places, and are suitable for most cargo lifting operations, such as steel, parts, etc. It should be noted that the QD type is not suitable for special environments.
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QZ type: Grab bucket overhead crane
As the name implies, the grab bucket crane is mainly used for grabbing materials. The grab bucket can be opened and closed, which can replace manual loading and unloading. Common application scenarios include transportation of coal, ore, grain, etc. It should be noted that the capacity of the grab bucket needs to be considered according to the density of the materials.
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QC type: Electromagnetic overhead crane
The QC type crane is characterized by an electromagnetic chuck, which has magnetism after being energized. It has a good transportation effect for metal products (such as steel plates, iron and steel, steel billets, etc.). It should be noted that the electromagnetic chuck only has magnetism after being energized. A backup power supply should be equipped during use to prevent material damage or personal injury caused by sudden power failure. In addition, this model cannot lift non-magnetic materials.
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QB type: Explosion-proof overhead crane
It is mainly used in flammable and explosive environments such as chemical plants, oil depots, and workplaces with severe dust.
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QN type: Insulated overhead crane, mainly used in live working environments.
- For ordinary lifting operations that do not involve special environments and special materials, you can safely choose the QD type.
- If the transported materials are bulk items such as grain, coal, gravel, etc., the QZ type will be your ideal choice.
- If the transported materials are metals that can be adsorbed by magnets, such as steel, steel coils, etc., the QC type will bring you surprises.
- If there is a risk of flammability and explosion in the environment, you can choose the QB type to ensure your work safety.
- If it involves a live environment, then the QN type crane will be your first choice.
In the crane industry, there is a basic principle: the lifting weight needs to be >= the maximum weight of a single piece in daily lifting operations, and a safety margin of 10% ~ 20% needs to be reserved to avoid affecting the product life due to long-term full-load operation.
For example, if the maximum weight of a single piece is 15 tons, a 20-ton crane should be preferred to ensure sufficient redundant lifting weight to cope with overweight, lifting errors, etc.
In addition to the above models and lifting weights, span and lifting height are also necessary parameters that we should consider.
- Span: refers to the distance between the center lines of the rails at both ends of the crane. Usually, it is necessary to choose a span 1 ~ 2 meters smaller than the span of the factory building to ensure that it can adapt to the factory environment and avoid collision with columns.
- Lifting height: refers to the maximum height that the hook can rise, which needs to ensure that materials can pass through obstacles, such as equipment, shelves, etc., so that the transported goods can reach the target position.
If you need to purchase a
double-girder overhead crane and are not sure whether the model you choose is suitable for your working scenario, you are welcome to leave us a message at any time. Our technical team will provide you with professional selection suggestions and make the best quotation plan for you. As a professional crane R & D and manufacturing enterprise, CATET has been deeply engaged in the industry for many years. Relying on its profound understanding of various industrial scenarios and technical precipitation, it can provide you with accurate selection support for double-girder overhead cranes. Thank you for reading this. If you are interested in our products, you can click here.
