1. Select the wheel material: first consider the size of the road surface, the obstacles, the residual materials on the site (such as iron filings, grease), the environmental conditions (such as high temperature, normal temperature or low temperature) and the weight that the wheels can carry. The conditions determine the choice of the appropriate wheel material. For example, rubber wheels are not resistant to acids, greases and chemicals. Super polyurethane wheels, high-strength polyurethane wheels, nylon wheels, steel wheels and high temperature resistant wheels can be used in different special environments.
2. Calculate the weight of the load: In order to be able to calculate the required load capacity of the various casters, it is necessary to know the weight of the transport equipment, the maximum load and the number of single wheels and casters used. The load capacity required for a single wheel or caster is calculated as follows:
T=(E+Z)/M×N:
---T=bearing weight required for single wheel or caster;
---E=The weight of the transport equipment;
---Z=maximum load;
---M=Number of single wheels and casters used;
---N = safety factor (about 1.3-1.5).
3. Determine the size of the wheel diameter: Generally, the larger the diameter of the wheel, the easier it is to push. The greater the load capacity, the better the ground can be protected from damage. The choice of the size of the wheel diameter should first consider the weight of the load and the starting thrust of the truck under the load. To decide.
4, the choice of soft and hard wheel material: usually the wheel has nylon wheel, super polyurethane wheel, high-strength polyurethane wheel, high-strength artificial rubber wheel, iron wheel, air pump. Super polyurethane wheel and high-strength polyurethane wheel can meet your handling requirements whether you are driving indoors or outdoors. High-strength artificial rubber wheels can be applied to hotels, medical equipment, floors, wooden floors, tile floors, etc. It is required to travel on the ground with low noise and quiet when walking; nylon wheels and iron wheels are suitable for places with uneven ground or iron scrap on the ground; and air wheels are suitable for light load and soft uneven road.
5, the flexibility of rotation: the larger the wheel, the more labor-saving, the roller bearing can carry heavier load, the resistance is greater when rotating: high-quality (bearing steel) ball bearing on single wheel installation, can carry heavier load The rotation is lighter, more flexible and quiet.
6. Temperature condition: The impact of the cold and high temperature on the casters is very great. The polyurethane wheel is at a low temperature of minus 45 °C, and the rotation is flexible. The high temperature resistant wheel rotates lightly at a high temperature of 275 °C.
Special Note: Since 3 points are used to determine a plane, when the number of casters used is 4, the load should be calculated in 3 cases.
Bulk Blending Fertilizer (BB Fertilizer/Mixture of Fertilizer) is a kind of compound granular fertilizer mixed by several single fertilizers or compound fertilizers according to certain proportion. It has characters of granule uniformity, less water, moderate granule intensity, no agglomeration, easy to use and low cost.
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