1. Select the wheel material: first, consider the size of the road surface, obstacles, residual substances (such as iron filings and grease) on the site, the environmental conditions (such as high temperature, normal temperature or low temperature) and the weight that the wheel can carry to determine the appropriate wheel material. For example, rubber wheels cannot be resistant to acid, grease and chemicals. Super polyurethane wheels, high-strength polyurethane wheels, nylon wheels, steel wheels and high-temperature wheels can be used in different special environments.
2. Calculation of load capacity: in order to calculate the required load capacity of various casters, it is necessary to know the dead weight of the transport equipment, the maximum load and the number of single wheels and casters used. The required load capacity of a single wheel or caster is calculated as follows:
T=(E+Z)/M × N：
—T=required bearing weight of single wheel or casters;
—E=dead weight of 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 wheel diameter: generally, the larger the wheel diameter is, the easier it is to push, the larger the load capacity is, and the better it is to protect the ground from damage. The selection of wheel diameter size should first consider the weight of the load and the starting thrust of the carrier under the load.
4. Selection of soft and hard wheel materials: generally, the wheels include nylon wheel, super polyurethane wheel, high-strength polyurethane wheel, high-strength synthetic rubber wheel, iron wheel and air wheel. Super polyurethane wheels and high-strength polyurethane wheels can meet your handling requirements no matter whether they are driving on the ground indoors or outdoors; High-strength artificial rubber wheels can be used for driving on hotels, medical equipment, floors, wooden floors, ceramic tile floors and other floors that require low noise and quiet when walking; Nylon wheel and iron wheel are suitable for places where the ground is uneven or there are iron chips and other substances on the ground; The pump wheel is suitable for light load and soft and uneven road.
5. Rotation flexibility: the larger the single wheel turns, the more labor-saving it will be. The roller bearing can carry a heavier load, and the resistance during rotation is greater. The single wheel is installed with high-quality (bearing steel) ball bearing, which can carry a heavier load, and the rotation is more portable, flexible and quiet.
6. Temperature condition: severe cold and high temperature conditions have a great impact on the casters. The polyurethane wheel can rotate flexibly at a low temperature of minus 45 ℃, and the high-temperature resistant wheel can rotate easily at a high temperature of 275 ℃.
Special attention: because three points determine a plane, when the number of casters used is four, the load capacity should be calculated as three.
Wheel frame selection
1. Generally, the weight of the casters, such as supermarkets, schools, hospitals, office buildings, hotels and other places, should be considered first when selecting a suitable wheel frame. Because the floor is good, smooth, and the goods handled are light (each caster carries 10-140kg), it is suitable to select the electroplating wheel frame formed by stamping thin steel plate (2-4mm). Its wheel frame is light, flexible, quiet and beautiful. This electroplating wheel frame is divided into two rows of beads and a single row of beads according to the ball arrangement. If it is often moved or transported, double row of beads shall be used.
2. In places such as factories and warehouses, where goods are frequently handled and loaded heavily (each castor carries 280-420kg), it is suitable to select the wheel frame with thick steel plate (5-6 mm) stamped and hot-forged and welded double-row ball bearings.
3. If it is used to carry heavy objects such as textile factories, automobile factories, machinery factories, etc., due to the heavy load and the long walking distance in the factory (each castor bearing 350-1200kg), the wheel frame welded after cutting with thick steel plate (8-12mm) should be selected. The movable wheel frame uses plane ball bearing and ball bearing on the base plate, so that the castor can bear heavy load, rotate flexibly, and resist impact.
Bearing selection
1. Terling bearing: Terling is a special engineering plastic, suitable for wet and corrosive places, with general flexibility and large resistance.
2. Roller bearing: the roller bearing after heat treatment can bear heavy load and has general rotation flexibility.
3. Ball bearing: The ball bearing made of high-quality bearing steel can bear heavy load and is suitable for occasions requiring flexible and quiet rotation.
4. Flat bearing: suitable for high and ultra-high load and high speed occasions.
matters needing attention
1. Avoid being overweight.
2. Do not offset.
3. Regular maintenance, such as regular oiling, and timely inspection of screws.
Post time: Feb-10-2023