Medical bed accessories – what factors need to be considered when choosing casters?
There are several types of casters for hospital beds, including single-sided brake casters, double-sided brake casters, silent casters, central control central brake casters, and central control side brake casters.
So what’s the difference between these casters?
How is the surface of the caster bracket generally treated?
In the market, the most common bracket colors are divided into two types: silver and black. The silver color is electroplated, and a layer of zinc or chrome is plated to make the color of the bracket into silver. The black ones are generally made of electrophoresis technology to make their brackets black. Another kind of high-end caster adopts powder spraying technology, and the color can be customized according to the needs of customers. Of course, the price is relatively high. Whether it is electroplating technology, electrophoresis technology or powder spraying technology, the purpose is to prevent the surface of the bracket from rusting.
What are the general types of brakes for casters?
The brakes of casters can be roughly divided into three types according to their functions: wheel brakes, direction brakes, and double brakes.
a. Wheel brake: It is easy to understand, installed on the wheel bushing or the surface of the wheel, and operated by hand or foot. The operation is to step on it, the wheels cannot be rotated, but they can be turned.
b. Braking direction: The braking direction is used in the universal wheel to change the universal wheel into a directional wheel so that it maintains the same direction.
c. Double brakes can not only lock the wheels to move, but also fix the wave plate to rotate.
Iron core wheels and cast iron wheels bear more weight than other wheels?
No, the technology in the process makes the injection molded wheels have the same load-bearing capacity.
Are rubber wheels (ER wheels) softer than polyurethane wheels (PU wheels)?
uncertain. The hardness of the material can be adjusted. Some manufacturers’ rubber wheels are harder than nylon wheels, so rubber casters also have hard rubber and soft rubber. When purchasing casters, if there is no requirement, soft rubber is the default.
Bearings are more stable than single bearings, and single bearings turn faster?
Double bearings are applied to high-end products, and their stability, quiet effect and load-bearing capacity are stronger than single bearings. The single bearing is a simplified version of the double bearing, although the performance is not as good as the double bearing, but the price is cheaper.
What factors will affect the flexibility of casters
There are many factors that affect the flexibility of casters, which can be roughly divided into the following categories:
a. The size of the wheel: the larger the diameter of the wheel, the more flexible the rotation and the less effort to push
b. The eccentricity of the tripod: the larger the eccentricity of the tripod, the more flexible it is, but the load capacity will decrease accordingly.
c. Wheel material: On relatively flat ground, the hard material rotates more flexibly, but on the uneven ground, the soft wheel saves effort.
d. The size of the wheel surface: the smaller the contact area between the wheel and the ground, the more flexible the rotation, so many wheels are designed with an arc surface, the purpose is to reduce the contact area with the ground.
Single ball bearings and double ball bearings have flexible rotation and are suitable for quiet environments; roller bearings have large bearing capacity but general flexibility; Terling bearings are suitable for humid and corrosive environments, but have relatively high resistance and general flexibility.
What should be paid attention to when installing casters?
a, make sure it is installed in a horizontal position;
b, universal wheel, to ensure that the axis of rotation is in a vertical position;
c. Orient the wheels to ensure that the two wheels are parallel and perpendicular to the frame.
When 4 casters are used at the same time, is it possible to multiply the bearing capacity of one caster by 4?
No, when 4 casters are used at the same time, the actual safe load is generally based on the sum of the parameters of the 3 casters, because when the road surface is uneven, only 3 casters can bear all the weight when the 3 casters touch the ground.
What factors need to be considered when choosing casters?
a. Consider the ground: casters are generally used on flat ground. If the ground is uneven, hard objects or iron filings remain, in this case, harder casters, such as iron wheels and nylon wheels, should be used.
b. Consider the on-site environment: polyurethane casters are generally used for the external environment or ground with acid and alkali. In an environment with a temperature of 60° or above, high temperature resistant casters or iron wheels are generally used. In the low temperature environment of minus 30°, it is more suitable to use rubber wheels.
c. Consider the surrounding environment: For low-noise environments, use soft, elastic polyurethane, artificial rubber and other casters, such as offices, hospitals, floors, quiet workshops, and dense transportation channels in shopping malls.
Post time: Apr-25-2023