Is the surface roughness of the slewing bearing as small as possible? Surface roughness refers to the small spacing and the unevenness of small peaks and valleys that the machined surface has. The roughness of the bearing surface may affect the wear resistance, stability, fatigue strength, stability and other properties of the bearing. Generally speaking, the smaller the roughness of the bearing surface, the better, but it should be determined according to the equipment use requirements and process accuracy.

The surface roughness of the slewing bearing is not as small as possible

Is the surface roughness of the slewing bearing as small as possible? It can be analyzed from the following aspects:

1. Physical properties of materials

The surface roughness of the bearing is often represented by Ra. Generally speaking, from the working principle, we hope that the smaller the surface roughness of the slewing bearing, the better. Generally, the higher the bearing tolerance accuracy level, the better the surface quality and the finer the workmanship. However, two surfaces that are too smooth are prone to gluing (exchange between the same or similar materials, which is similar to the “dyeing phenomenon” in our life, but it belongs to the exchange of metal substances here), while the surfaces that are too rough are prone to gluing. Under the action of force, the surface is prone to peeling off (that is, what we often call wear).

2. Processing cost

Theoretically, the smaller the value of the surface roughness of the slewing bearing, the better, the smaller the roughness, the smoother the surface and the more beautiful the appearance. However, the size of the roughness is determined by the machining process and other factors, such as the friction between the tool and the bearing surface, cutting, and high-frequency vibration in the process.

However, the smaller the surface roughness, the higher the processing cost. Whether the use cost of the part matches the consumption speed and the profit of the equipment production output value. These all need to be considered. Some spare parts do not have high requirements on the roughness of the bearing surface. Excessive pursuit of the surface roughness will affect the economy of processing.

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For more details click to visit:https://www.ldb-bearing.com/ldb-bearing-knowledge/slewing-bearing-surface-roughness.html

The vibrating screen exciter is an important component that utilizes mechanical vibration. The exciter can make the excited object obtain the vibration amount of the form and size, so as to conduct vibration and strength tests on the object, or calibrate the vibrating screen and sensor.

The vibrating screen exciter can also be used as an excitation component to form a vibrating machine to realize the conveying, screening, compacting, forming and tamping of soil sand and gravel of materials or objects.

1. Damage to the vibration damping system

For example, the failure of the vibration damping spring or the accumulation of materials under the screen will make the vibration damping system uncoordinated, resulting in damage to the vibrating screen exciter.

2. Installation quality problems

Improper adjustment of the exciter gap during the installation process will cause errors in the axial radial joints between the exciter and the motor, and the universal coupling, as well as the relative position of the exciter eccentric block. Excessive vibration of the vibrator produces high temperature, which seriously affects the normal operation of the vibrating screen.

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For more details click to visit:https://www.hsd-industry.com/news/abnormal-handling-of-vibrating-screen-exciter/

One of the most important aspects of environmental protection is to control noise pollution. Noise pollution is a common problem in the machinery industry. The noise of concrete mixer trucks are composed of mechanical noise and motor noise.

When the feeding system of the mixer feeds the stones, sand, cement and water into the conical mixing drum of the mixer in a certain proportion for mixing, the sand and stones and between the sand and the wall of the drum rub and collide with each other, causing a large area of ​​​​the drum wall. Vibrates and produces stirring noise. The vibration of a large area radiates not only low-frequency noise but also high-frequency noise, and the impact noise of the mixer is about 95).

When stones, sand and water enter the mixing drum and start mixing, the noise is loud, and the noise decreases slightly when cement is added. On the other hand, in the transmission of power, the noise generated by the unbalanced friction of the contact surface between the belt and the pulley and between the gears during the rolling process and sliding process is about 87).

The above-mentioned mechanical noise generated by solid vibration is the main noise source of the mixer. Its motor noise is relatively small, about 85). Concrete mixers are usually installed in the open air. The equipment does not have any sound insulation and noise reduction measures, and its noise spreads out as far as 100 meters away. At the same time, the sun and rain will cause the transmission parts to corrode or lack of lubrication, which will also aggravate the mechanical noise. These numerous noise-generating factors need to be addressed urgently.

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Details can be accessed by clicking here:https://www.ly-cimc-linyu.com/news/concrete-mixer-truck-noise-solution/

The square bottom bag is also called the paste bottom bag. The mouth can be sewn after filling. The open square bottom bag is widely used in the food industry. This kind of paper bag is produced by the square bottom machine. Then the installation and debugging of the bottom of the square bottom machine If you know the method, let’s take a look at it in detail.

Bottom installation of square bottom machine

1. Understand the attachment

There are many operating accessories at the bottom of the bottom paste machine, and the installation positions are also different. In order to master the operation skills of bottom stickers as soon as possible, you should memorize the names, installation positions and usage methods of various accessories. On this basis, it can be used flexibly. In order to change the paper shape at will in the future, various accessories can be quickly and accurately installed in place, and the bottom paste work can be completed with high quality.

2. Pull up and bend at the bottom

The folded corner of the paste bottom hook is at the cutting position of the straight line and the arc of the bending plate. When the bottom paste hook pulls up the bottom of the paper and bends it, immediately press and bend the bottom of the bottom of the paper. At the same time, the position of the lower support board should be adjusted so that the bottom sticker can be strongly supported when it is hooked to the bottom, and a special paper pressing rod should be installed so that the folded cardboard will not be left behind the bottom sticker hook and the pressing board. Rebound, after sizing and pressing by the sizing roller, it is smoothly fed into the folding part for folding.

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For more details click to visit:https://www.lyhuatianm.com/products-information/installation-and-adjustment-method-of-the-bottom-of-the-square-bottom-machine.html

The use of school desks and chairs will have a greater impact on schools and students, so there are many aspects that need to be paid attention to when configuring desks and chairs. So how to correctly choose school desks and chairs manufacturers?

How to choose the school desk and chair manufacturer correctly

1. First of all, before we choose the school desk and chair manufacturer, we can conduct a systematic inquiry on the manufacturer on the Internet, so that we can have a certain basic understanding of the manufacturer, but we need to pay attention to not blindly believe that its online Because they are basically beautified, they are not necessarily true. Therefore, after having a basic understanding, you can conduct on-the-spot inspections in several favorite manufacturers, so that you can see more intuitively. The strength of the manufacturer.

2. Then we can observe more about the scale of the manufacturer during the on-site inspection, such as its production equipment, technicians and processes, etc. Generally, manufacturers with sufficient strength are relatively complete as a whole, and their requirements are relatively high. Therefore, from these aspects, it can be seen whether the manufacturers of school desks and chairs are good or not, so that the selected products can be guaranteed enough and avoid unnecessary hidden dangers and troubles to themselves.

3. Because desks and chairs are used more frequently, and the users are mainly students, but the school’s procurement itself also has certain restrictions, so the quality of school desks and chairs is more valued by everyone, so school classes Table and chair manufacturers must ensure that their quality is good enough, but some damage will inevitably occur after a period of use, so its after-sales is very important, so when choosing a manufacturer, pay attention to whether it can provide good after-sales.

Several tips for purchasing school desks and chairs

1. The color of school desks and chairs should not be too bright

When choosing school desks and chairs, many people think that they should choose brighter and more active colors, or choose a lot of cartoon patterns according to children’s preferences, etc. They feel that bright and bright colors help children form optimistic and lively characters. . However, some agency tests have shown that the brighter the paint color, the more heavy metals such as lead it contains. This is mainly caused by the lead compounds contained in the paint pigment, so the brightly colored school furniture has a much higher content of harmful substances than ordinary ones. Therefore, when purchasing desks and chairs, remember to ask the manufacturer for the school furniture paint inspection report to check whether the desks and chairs are qualified.

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For more details click to visit:https://www.aoyangschoolfurniture.com/aoyang-news/choose-school-desks-and-chairs-manufacturers.html