Is the surface roughness of the slewing bearing as small as possible? How to choose?

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

Slewing Bearings

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

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How to increase the output of vibrating screen?

Mining vibrating screen is a kind of large-scale screening equipment, commonly used in the mining industry, etc. The use of this vibrating screen to screen materials generally requires relatively large output. In use, we also hope that the larger the output of the equipment, the better. Since the models and specifications produced by each vibrating screen manufacturer are different, the output of each equipment is also different, but this can be improved by some methods, so how to increase the output of the vibrating screen?

The method of increasing the output of vibrating screen

High frequency dehydration vibrating screen

1. Improve the opening rate of the screen mesh

Because the ore is relatively large in mesh, a metal woven mesh or punching plate with a large aperture is generally used. If you want to increase the output, you can also replace the screen mesh with a larger aperture than the previous one for production. The high opening ratio is beneficial to improve the screening effect; but the disadvantage is that it is not as high as the previous screening. Therefore, once the output needs to be increased, it will inevitably affect the screening accuracy.

2. Adjust the feeding method

A distribution device can be installed at the feed port of the linear vibrating screen, so that the material can be evenly fed to the screen surface to achieve the requirement of increasing the output, which is of great help to improve the screening output of the linear screen. If the distributor is added unconditionally, attention should be paid to manual feeding to ensure uniform feeding. When feeding, the cloth should be evenly distributed.

3. Increase the screening area

The screening area of ​​the linear vibrating screen can be achieved by increasing the length and width of the screen surface. The width of the screen surface determines the processing capacity of the sieve. The wider the screen surface, the greater the output; the length of the screen surface determines the screening efficiency. The longer the screen surface, the longer the material screening time, and the higher the efficiency. After the size is reduced, the sieving efficiency improves little or not at all. At this time, increasing the length of the sieve surface will only increase the volume and weight of the sieve.

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For more details click to visit:https://www.hsd-industry.com/news/how-to-increase-the-output-of-vibrating-screen/

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How to deal with abnormal operation of vibrating screen exciter?

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.

DE60A

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/

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What are the common faults and solutions of impact crushers?

Impact crusher is a crushing machine that uses impact energy to crush materials. It can handle materials with a side length of 100-500 mm or less, with a compressive strength of up to 350 MPa, with a large crushing ratio, and the crushed materials are cubic particles. Widely used in building materials, ore crushing, railways, highways, energy, transportation, energy, cement, mining, chemical and other industries for medium and fine crushing materials, the size of the discharge can be adjusted, and the crushing specifications are diversified.

When any machine is used for a long time or is used improperly, it will cause the situation that it cannot be used normally. So what are the common faults and solutions when using the impact crusher? Crusher manufacturers take you to share their common faults and solutions in detail:

1. The counterattack starter does not turn

Check whether the material in front of the feeder falls into the crushing cavity due to the vibration of the shutdown, causing the material to stick to the rotor. It is necessary to clean up the materials in the crushing chamber and start the machine again to solve the problem.

2. The counterattack breaks the bearing and generates heat

It should be checked whether the lubrication of the bearing is good. Under normal circumstances, the lubricating oil should be filled with 50% of the volume of the bearing seat; in another case, the lubricating oil is deteriorated and viscous, and the bearing needs to be cleaned and replaced with new lubricating oil. Too much or too little oil in the bearing will cause the bearing to heat up. When refueling, check the oil level. If the bearing is damaged, replace the bearing in time. If the upper cover is too tight, it is advisable to adjust the bolt tightness.

3. Abnormal vibration of equipment

If there is abnormal vibration, the operator should stop immediately, we need to check the following conditions.

(1) Check whether there are metal impurities or broken parts inside, and clean the crusher cavity;

(2) Check the fastening of the inner lining plate and the gap between the blow bar and the lining plate. If the gap is too small, abnormal noise will be caused;

(3) It may be that the feed size is too large;

(4) The wear parts are unevenly worn, and the impact hammer needs to be replaced;

(5) The rotor is unbalanced and needs to be adjusted and checked for balance;

(6) Check whether the anchor bolts of the equipment are tightened and properly reinforced.

Impact Crusher

4. Counterattack to break the belt and turn over

Mainly because the belt is damaged, the V-belt needs to be replaced, and attention should be paid to ensure the quality of the belt; or because of the inappropriate assembly of the pulley, the active and driven pulleys need to be adjusted on the same plane.

5. The machine bearing is bent or broken

The main reasons are the long-term overload operation of the main engine, improper heat treatment of the bearing, and excessive hardness of the broken objects. When handling, it is necessary to replace the new bearing, and pay attention to timely maintenance and repair in the future operation process.

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For more details click to visit: https://www.zymining.com/blog/common-faults-and-solutions-of-impact-crusher.html

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How to solve the excessive noise of concrete mixer truck?

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).

tank

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/

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What are the maintenance methods for mobile shelves in summer?

It’s summer now, and basically it’s time for the heat. In such an environment, some materials will crack due to excessive temperature, so what is the maintenance method of the dense rack in the hot summer? Due to the difference between manual compact racks and intelligent compact racks, it is also necessary to distinguish them clearly in terms of maintenance.

Reasons for maintaining mobile shelves in summer

The structural stability and moisture content of mobile shelves are important factors that determine their structural stability and moisture content. Therefore, special attention should be paid to preventing their deformation and cracking during the maintenance process.

A layer of paint is applied on the surface of the mobile shelf. If this layer of paint is damaged, it will not only affect its aesthetics, but also affect the structure inside. Therefore, try not to directly contact the sun to avoid the paint film falling off .

Mobile office shelving

Methods of maintaining mobile shelves in summer

1. In daily life, we can use a dry and soft cotton cloth to wipe off the dust on the surface of the mobile shelf. After a period of time, we can use a wet cloth that has been wrung out of moisture to wipe off the dust on the corners of the mobile shelf. , and then wipe it with a clean dry soft muslin cloth.

2. For mobile shelves, the most worrying thing is dragging. If it is an ordinary mobile shelf, the bottom needs to be shaken. If it is a large mobile shelf, please ask for help, and split and move it. Do not move blindly by yourself, otherwise it will damage the shelves and have a serious impact on our economy.

3. In the rainy weather, the room where the mobile shelves are placed should have as few windows as possible, especially in the south where the air is humid. After the archives are stored with dense shelves, it is essential to have an archives dehumidifier.

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For more details click to visit:https://www.etegreen.com/blog/summer-mobile-shelves-maintenance-method/

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Installation and adjustment method of the bottom of the square bottom machine

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

HD100-ID

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

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HOW TO DEAL WITH DUST WHEN CALCIUM HYDROXIDE POWDER IS SELECTED?

Calcium hydroxide powder selection is to make the extracted calcium hydroxide mesh more pure. There are many kinds of powder separators, such as centrifugal, three-separation, fly ash and other different types. Qualified powder is selected.

In the process of calcium hydroxide production, even if it is produced by professional calcium hydroxide production line equipment, it is almost inevitable to mix impurities. In order to improve the quality and purity of calcium hydroxide powder, it is necessary to select qualified powders. For this qualification, in addition to requiring purity, the fineness of the powder should also be distinguished.

Small calcium hydroxide powder also has many parameters. It is based on these parameters that people keep thinking about the method of powder selection and design a powder separator. For example, according to the quality and density of the powder, under a certain wind speed, the powder can be divided into two piles with a cyclone separator. Obviously, the pile is needed, and the pile is the so-called impurity.

For the powder separator, the simpler the structure, the better, and the overly complicated powder selection channel is not conducive to the discharge of the selected powder from the powder selection device.

Due to the centrifugal force of the calcium hydroxide powder separator during the powder selection process, it is inevitable that dust will occur. When it comes to dust removal, the first thing that comes to mind is the pulse bag filter.

calcium hydroxide

Pulse dust removal adopts pulse bag type dust removal technology, which overcomes the shortcomings of conventional pulse dust collectors and sub-chamber back-flushing dust collectors. The land area is small, the operation is stable and reliable, and the economy is good. And the falling powder can be recycled and reused, which is a link to reduce the cost of producing calcium hydroxide powder, which overcomes the problem of re-pollution of water dust removal. Any conveying device falls directly into the digester and enters the powder selection system.

For more details click to visit:https://www.ly-gaifeng.com/blog/calcium-hydroxide-dust-treatment.html

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How to choose the school desk and chair manufacturer correctly?

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

Classroom Chairs and Tables

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

Classroom Chairs and Tables

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

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How is the slewing bearing soft belt produced? The installation position of the flexible belt

The raceway of the slewing bearing generally needs to be heat treated. In the heat treatment process, because the diameter of the raceway circle of the slewing bearing is relatively large, flame surface quenching is usually used. The method is to use acetylene to heat the surface of the workpiece to be hardened and then add water to cool it. , this process is completed continuously.

1. How is the slewing bearing soft belt produced?

During the production and processing of the slewing bearing, the raceway of the device generally needs to be heat treated. The usual processes are: forging → rough machining → quenching and tempering treatment → finishing → raceway surface flame surface quenching → raceway surface grinding and other processes . One of the raceway surfaces is flame quenched to form a soft band.
The so-called soft belt is the area that has not been heat treated. The formation of the soft band is necessary for the heat treatment process. In the heat treatment process of the slewing bearing, because the diameter of the raceway circle of the slewing bearing is relatively large, flame surface quenching is usually used. The method is to use acetylene to heat the surface of the workpiece to be hardened and then add water to cool it.

Slewing Bearings

The heated flame spray gun and water gun are mounted together while making a circular motion along the circle of the workpiece. When the movement is close to 360 degrees, the heating and water spray are stopped immediately. That is, the circular areas of heating and water spray do not overlap. Cracks in the workpiece can occur if the circle areas where the heating and water spray occur overlap (heat treatment at an angle greater than 360 degrees on the circle). The tangential width of the unheated area is typically 15 mm. This 15 mm area is called the soft belt in the slewing bearing, that is, the so-called soft belt is the area without heat treatment. The formation of the soft band is essential to the heat treatment process.
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Under normal circumstances, the steel character “S” is marked on the position where the soft belt exists in the workpiece to indicate the specific soft belt position. The installation position of the soft belt is essentially to improve the life of the bearing. From the perspective of the user and the manufacturer, it is still a reasonable position to install the upper and lower ring soft belts of the slewing bearing. Therefore, the manufacturer of the slewing bearing should accurately mark the position of the soft belt of the slewing bearing, and the manufacturer and installer should reasonably install the position of the soft belt of the slewing bearing as needed.

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

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