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Single beam grab bridge crane

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Grab crane

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The basic conditions to ensure that the grab is full of materials are: a suitable bucket type, basic size and sufficient weight. According to the characteristics of the material being grabbed, grabs are often divided into four basic types: light, medium, heavy and extra heavy. All kinds of grabs are suitable for materials and the ratio of their own weight to the weight of materials is shown in Table 1. The weight of the medium grab is approximately equal to the weight of the material, the light weight is smaller, and the heavy weight is larger.

For various types of grabs, the corresponding parameters and structure should be selected. The double-jaw grab is suitable for grabbing granular and powder materials. When grabbing materials with a particle size greater than 100mm or more solid materials, the jaw plate should be made of belt Toothed; when the grabbing bucket is used to unload the standard rail vehicle, the grab bucket volume is generally not more than 3m. Multi-jaw (also known as lotus) grab, the number of jaws of the bucket is generally 6 pieces, and the jaw cut is sharp, suitable for grabbing materials that are difficult to insert in a double-jaw grab, such as large hard ore, aluminum Ingots, iron filings and scrap steel, etc.

Table 1 Grab characteristics

Grab type	Light	Medium	Heavy	Extra heavy
Bulk density of materials /t·m	0.8～1.2	>1.2～2.0	>2.0～2.8	>2.8
Weight and materials weight ratio	0.75～0.8	0.9～1.0	1.2～1.4	1.5～1.6
Adapt to materials	Medium lump coal, coke, slag, cement	Limestone, large coal, peat, sand in water, flaky iron oxide scale	Iron ore, fine ore, heavy clay, rod-shaped iron oxide scale	Large ore, large manganese ore