Introduction: The cotton product itself has a certain amount of moisture, and the normal moisture content of the general cotton product is 6-7%. And cotton products have a strong hygroscopicity. Storage environment If the humidity is too high and the temperature is too high (ie, the temperature is above 30°C and the relative humidity is over 75%), the cotton product will absorb the moisture in the air and make its own water content exceed the normal water content. In this way, during storage, Cotton products are susceptible to mildew and decay. The storage of raw materials such as cotton products or cotton yarns is quite strict with respect to temperature and humidity. In the processes of spinning and weaving, the temperature and humidity are closely related to the performance of cotton yarns, which is even more important. Compared to other rolling-element bearings, Slewing Bearings are thin in section and are often made in diameters of a metre or more; the slewing bearings on the Falkirk Wheel are 4 metres diameter and fit over a 3.5 metre axle. Slewing bearings resemble oversize aircraft control surface bearings. Slewing Bearings Slewing Bearings,Slewing Ring Bearing,Single-Row Ball Slewing Bearing,High Precision Slewing Bearings Ningbo Ritbearing Imp & Exp Co.,Ltd. , http://www.ritbearingchina.com
The cotton product itself has a certain moisture content, and the normal moisture content of the general cotton product is 6-7%. And cotton products have a strong hygroscopicity. Storage environment If the humidity is too high and the temperature is too high (ie, the temperature is above 30°C and the relative humidity is over 75%), the cotton product will absorb the moisture in the air and make its own water content exceed the normal water content. In this way, during storage, Cotton products are susceptible to mildew and decay. In addition, because the temperature is too high, the molecular motion energy inside the cotton fiber is increased, the attraction between the cotton fiber molecules in some regions is weakened, and the tensile strength of cotton yarns and other products is reduced. The temperature has a great influence on the softness of the cotton. Generally, the cotton fiber is soft when the temperature is high. Due to the presence of cotton wax, cotton fibers have a certain temperature requirement. Although the wax content only accounts for 4.3-4.5%, the temperature has a great influence on it. Because the cotton wax begins to soften at about 18.3°C, the cotton fiber is soft at this time, and the cotton wax is softened, which can play a role in lubrication and is particularly advantageous for the machining of the cotton yarn. When the temperature is lower than 18.3°C, the wax is hardened and the cotton yarn is relatively weak. Plasticity is reduced, which increases the friction between the fibers in the process of spinning, and can easily increase the yarn breakage during machining. Therefore, controlling temperature and humidity is particularly important for storage of textile warehouses.
In order to make the leather products tough and soft, a certain amount of oil is added during the tanning process. The normal oil content of normal fur is 3 to 4%, and the normal moisture content is 15%. If the temperature of the storage environment is too high or too low, the leather will lose fat and water during the storage process, so that the content is lower than the normal standard, so that the leather is easily cracked and loses its flexibility and elasticity. If the humidity in the storage environment is too high, the leather products will absorb moisture and become mildewed, affecting normal use.
Comparison of performance of air-conditioning dehumidification and professional dehumidifiers
Dehumidification and moisture protection, some people will consider the cost savings to choose to use ordinary air-conditioning to dehumidify; some people choose to use a professional dehumidifier to dehumidify, then, the dehumidifying principle of air-conditioning and dehumidifier dehumidification in the end what is the difference? In the following, we come to the details Explanation:
First, the working principle of air conditioning dehumidification:
There are two common dehumidification methods for air conditioners. The first type is refrigeration dehumidification; the other is an independent dehumidification function
A. Air-conditioning cooling and dehumidification: During the cooling process, the humid air passes through the air-conditioner evaporator and the temperature drops drastically. The air humidity is in an over-saturated state. The excess water vapor is precipitated in the form of condensed water and condensed in the evaporator. On the fins, that is, "condensing," until the cooling mode reaches a certain equilibrium, the air humidity will drop to a certain level. Therefore, when the air-conditioning cooling process, not only the air temperature is reduced, together with the humidity of the air will also be reduced, air drying will induce a series of respiratory diseases. This is the working principle of dehumidification under the air-conditioning cooling mode. It is actually the "side effect" of the cooling process and reduces the humidity.
B. What is the working principle of the independent dehumidification function in the uncooled mode?
Many air conditioners now have an independent dehumidification function. In fact, its working principle is to reheat the air cooled by the evaporator to the original temperature and then send it to the room. In other words, the indoor fan has been running at low speed, and the compressor has been switched on and off (compressor frequently starts and stops will seriously affect the service life, and the market will often see the use of less than half a year), and the refrigeration system will perform an intermittent refrigeration cycle. Most of the generated cooling capacity is used to balance the latent heat of air in the air, that is, water vapor becomes condensed water. A small part is used to balance sensible heat, that is, lowering some room temperature. This is continuously circulated, keeping the air temperature close to the set value while removing moisture in the air in large quantities. This keeps the indoor environment relatively constant with reduced humidity. The cooling of the air conditioner is only for condensation. There is little control over the temperature, so this dehumidification is called constant temperature dehumidification.
After seeing the dehumidification method of the air conditioner, let's take a look at the dehumidification principle of the dehumidifier:
Second, the dehumidifier works
The general working principle of the dehumidifier is simply to utilize the moisture in the air to condense the tyrants when entering the evaporator of the dehumidifier, and then accumulate the drips and discharge them into the drain, so as to achieve the purpose of reducing the space humidity. The principle is similar to the dehumidification principle in the air conditioner cooling mode. After condensing the air into water, it is discharged and the air temperature in the room is balanced.
From the above, it can be seen that the principle of dehumidification of air conditioners is similar to that of general dehumidifiers. But why do we need to choose a dehumidifier for dehumidification?
Because the dehumidifier is easy to move, the professional dehumidification technology, and the better dehumidification effect are incomparable with the “side effect†type dehumidification function of the air conditioner, the fixed position of the air conditioner and the dehumidification function accompanying the refrigeration cannot actually affect the humidity in the air. Plays a significant dehumidification effect in a short time. Therefore, the dehumidification function of the air conditioner is actually a limited degree of dehumidification, and it is the best policy to dehumidify the moisture or to purchase a dehumidifier. In addition, the dehumidifier's working method is to reduce the temperature inside the machine and analyze the water in the air. The temperature of the space will rise slightly, but the temperature difference is not obvious, and it is suitable for the wet season outside midsummer, and the electricity consumption is also relatively low.
A slewing bearing or slewing ring is a rotational Rolling-Element Bearing or plain bearing that typically supports a heavy but slow-turning or slow-oscillating load, often a horizontal platform such as a conventional crane, a swing yarder, or the wind-facing platform of a horizontal-axis windmill.
Slewing bearings often use two rows of rolling elements. They often use three race elements, such as an inner ring and two outer ring "halves" that clamp together axially.
Slewing bearings are often made with gear teeth integral with the inner or outer race, used to drive the platform relative to the base.
As for other bearings that reciprocate, rather than rotating continuously, lubrication can be difficult. The oil wedge built up in a continuously rotating bearing is disrupted by the stop start motion of slewing. Instead, a hydrostatic bearing with pumped oil flow may be used.