Archive for category: news

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.

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.

…

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

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 .

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.

…

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

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.

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

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.

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.
​​
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.

Most industrial production requires burning coal to obtain a high-temperature production environment. In order to improve the combustion performance of coal, briquette is basically used. The briquette can better meet the needs of industrial production in terms of strength and durability.

But not all the briquette pellets pressed by the briquetting machine can meet the requirements, and their performance is easily changed by the adjustment of the equipment parameters. How to measure the performance of the briquette machine?

1. Pellet forming principle of briquette briquette machine

Driven by the motor, the pair of rollers of the briquette briquetting machine rotate in opposite directions at the same speed. When the material falls between the two pairs of rollers, it begins to be compressed at the junction. At this time, the material is compressed in volume between the corresponding two ball sockets. ; The rollers rotate continuously, the ball socket is gradually closed, and the forming pressure gradually increases. When the distance between the two ball sockets is minimum, the forming pressure reaches the upper limit.

Then the rollers are rotated to gradually separate the ball sockets, and the molding pressure decreases rapidly. When the forming pressure is reduced to zero, the pressed briquette begins to expand and break away.

2. Determination method of pellet performance of briquette briquette machine

(1) Cold strength:

Randomly select 10 briquette pellets and place them on the particle strength testing machine one by one for pressure feed test, record the pressure value indicated when each briquette pellet cracks, and calculate the average value, the unit is N/ball. The average error is valid in the range of +50N, ​​and the ambient temperature is 25 degrees Celsius.

…

For more details click to visit:https://www.zymining.com/blog/test-method-for-pellet-properties-of-briquette-briquetting-machine.html