Product warranty clause |
All dongrui products are guaranteed for one year from the date of leaving the factory for damage caused by raw materials and production process defects. However, the liability for damage caused by improper use, overload modification or installation error is excluded. Products returned due to quality approved by dongrui company will be replaced free of charge (shipping and installation costs). This warranty does not contain any other warranties, express or implied, for dongrui products only. For example, implied evidence of commercialization and applicability for a particular purpose. This warranty is limited to the free replacement of the contract and dongrui is not liable for any other liability, including liability for accidents, related losses or special damages. |
How do you choose the right caster for your use |
I. how to choose the appropriate caster: 1. Calculation of bearing weight: in order to calculate the load capacity required by 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 load capacity required for a single wheel or caster is calculated as follows: T= (E+Z) /MXN; T= the bearing weight of a single wheel or caster and the number of caster; E= dead weight of transport equipment; Z= maximum load; M= the number of single wheels and casters used; N= safety factor (about 1.3-1.5). 2. Determine wheel diameter: generally, the larger the caster diameter is, the easier it is to push, and the larger the load capacity is, at the same time, able to protect the ground from damage. 3. Rotational flexibility: the greater the rotation of a single wheel, the more effort is saved. The roller bearing can carry a heavier load, and the resistance during rotation is larger. Single wheel mounted with high quality (bearing steel) ball bearing, can bear heavier load, rotation more light, flexible and quiet. 4. Temperature condition: cold and high temperature conditions have a great impact on caster. Polyurethane wheel can rotate flexibly at a low temperature below zero. Second, how to choose the appropriate wheel frame 1. Choose the suitable choice considering bearing the weight of the castor wheel frame, such as supermarkets, schools, hospitals, office buildings, hotels and other places, because the floor is good, smooth and lighter, handling of goods (each trundle bearing in 10-140 - kg), suitable for selection (2-4 mm) with a thin plate stamping plating wheel frame, the wheel frame is light, flexible operation, quiet and beautiful, the plating wheel frame in accordance with the ball bearing arrangement is divided into double row bead and single bead. Double row beads should be used when moving or handling. 2. In factories, warehouses and other places, goods are moved frequently and the load is heavy (each casters bearing 280-420kg), then suitable for the selection of thick steel plate (5-6mm) stamping hot forging and welding double row ball wheel frame. 3. If used for carrying heavy things such as textile factory, automobile factory, machinery factory and other places, because the charge big factories within walking distance (caster wheel bearing only at 350-1200 kg) each, therefore, should choose to steel plate (8-12 mm) after cutting wheel frame, welding activities wheel rack plane bearing and ball bearing on the floor, make the castor can withstand the heavy loading, flexible rotation, impact resistance, etc. Three, choose the appropriate bearing 1. Cone bearing: it can bear heavy load and rotate flexibly. 2. Needle roller bearing: after heat treatment, needle roller bearing can bear heavier load and has general rotation flexibility. 3. Ball bearing: the ball bearing is made of high-quality bearing steel, which can bear heavy load and is suitable for occasions requiring flexible and quiet rotation. 4. Flat bearing: suitable for the coordination of high and extra-high load and high speed. |
All kinds of caster with bearing
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