Casters are a general term, including movable casters, fixed casters and movable brake casters. Movable casters are also known as universal wheels, whose structure allows 360 degrees of rotation; Fixed casters are also called directional casters. They have no rotating structure and cannot rotate. Usually, the two casters are used together. For example, the structure of the trolley is two directional wheels at the front, and two universal wheels at the back near the handrail. Casters are made of various materials, such as pp casters, PVC casters, PU casters, cast iron casters, nylon casters, TPR casters, iron core nylon casters, iron core PU casters, etc.
origin
It is also very difficult to trace the history of castors. However, after people invented the wheel, it became much easier to carry and move objects, but the wheel can only run in a straight line. It is still very difficult to change the direction when carrying heavy objects. Later, people invented the wheel with a steering structure, which is called castors or universal wheels. The appearance of casters has brought about an epoch-making revolution for people to carry, especially moving objects. They can not only carry easily, but also move in any direction, greatly improving efficiency.
In modern times, with the rise of the industrial revolution, more and more equipment needs to be moved, and castors are used more and more widely all over the world. In modern times, with the continuous development of science and technology, the equipment has more and more functions and high utilization, and the casters have become indispensable components. The development of castors has become a special industry with more specialization.
Structural characteristics
Installation height: refers to the vertical distance from the ground to the installation position of the equipment. The installation height of the casters refers to the maximum vertical distance from the bottom plate of the casters to the edge of the wheels.
Support turning center distance: refers to the horizontal distance from the vertical line of the center rivet to the center of the wheel core.
Turning radius: refers to the horizontal distance from the vertical line of the center rivet to the outer edge of the tire. The proper spacing enables the casters to turn 360 degrees. The reasonable turning radius directly affects the service life of the casters.
Driving load: the bearing capacity of the casters when moving is also called dynamic load. The dynamic load of the casters varies according to the factory test methods and the wheel materials. The key is whether the structure and quality of the support can resist impact and vibration.
Impact load: the instantaneous bearing capacity of the casters when the equipment is impacted or vibrated by the load. Static load Static load Static load Static load: the weight that the casters can bear under static state. Generally, the static load shall be 5~6 times of the driving load (dynamic load), and the static load shall be at least 2 times of the impact load.
Steering: Hard, narrow wheels are easier to turn than soft, wide wheels. The turning radius is an important parameter of wheel rotation. If the turning radius is too short, it will increase the difficulty of steering. If the turning radius is too large, it will lead to wheel shaking and shorten the life of the wheel.
Driving flexibility: The factors that affect the driving flexibility of the casters include the structure of the support and the selection of the support steel, the size of the wheel, the type of wheel, bearings, etc. The larger the wheel, the better the driving flexibility. The hard and narrow wheels on the smooth ground save more effort than the soft wheels with flat edges, but the soft wheels on the uneven ground save more effort, but the soft wheels on the uneven ground can better protect the equipment and avoid shocks!
application area
It is widely used in handcart, mobile scaffold, workshop truck, etc.
The simplest invention is often the most important, and castors have this feature. At the same time, the degree of development of a city is often positively related to the number of casters used. For example, Shanghai, Beijing, Tianjin, Chongqing, Wuxi, Chengdu, Xi’an, Wuhan, Guangzhou, Foshan, Dongguan, Shenzhen and other cities, the use rate of casters is very high.
The structure of the casters is composed of a single wheel mounted on a bracket, which is installed under the equipment to make it move freely. Casters are mainly divided into two categories:
A. Fixed castors: fixed supports are equipped with single wheels and can only move in a straight line.
B. Movable castors: 360 degree steering support is equipped with single wheel, which can drive in any direction at will.
The single wheels of casters are various in size, model and tire surface. Select the appropriate wheel based on the following conditions:
A. Use the site environment.
B. Load capacity of the product.
C. The working environment contains chemicals, blood, grease, engine oil, salt and other substances.
D. Various special climates, such as humidity, high temperature or severe cold
E Requirements for impact resistance, collision resistance and driving quietness.
Using Materials
Polyurethane, cast iron steel, nitrile rubber wheel (NBR), nitrile rubber, natural rubber wheel, silicon fluorine rubber wheel, neoprene rubber wheel, butyl rubber wheel, silicon rubber (SILICOME), ethylene propylene diene monomer rubber wheel (EPDM), fluorine rubber wheel (VITON), hydrogenated nitrile (HNBR), polyurethane rubber wheel, rubber plastic, PU rubber wheel, polytetrafluoroethylene rubber wheel (PTFE processing parts), nylon gear, POM rubber wheel, PEEK rubber wheel, PA66 gear.
Post time: Jan-08-2023