Glory Moment | Vanguard Machinery's 350 T/H Diabase Crushing Project was Successfully Launched in Russia

 Recently, Vanguard Machinery's 350 t/h diabase crushing production line project was successfully put into production in Russia. Vanguard Machinery provided overall solution design, installation and EPC general contracting services for this project. The smooth operation of the production line has once again consolidated Vanguard Machinery's influence in the Russian market, marking that the company's technical strength and service advantages in the global market have been verified again.

It is understood that the production line is equipped with the latest technological achievements of Vanguard Machinery, including 912 jaw crusher, CS840 single-cylinder cone crusher and YK2870 series vibrating screen. These equipment can perform well in complex production environments with their excellent performance and reliability, especially in low-temperature conditions, while maintaining stable and efficient operation. This is an important consideration for cold climate regions such as Russia. To enable them to work without load below minus 50 degrees Celsius and adapt to the high-intensity production needs in extremely low-temperature environments, Vanguard Machinery adopted measures such as selecting fuel oil with a lower freezing point, replacing gear oil with gear lubricating oil and grease for winter, and using high-quality brake fluid in the brake system in the early stage of design to cope with high-demand environmental conditions and strict operating requirements. Vanguard Machinery not only carefully optimized the equipment design, but also provided professional after-sales installation services, successfully overcame challenges, and won unanimous praise from customers. The customer highly praised the professionalism and efficient execution demonstrated by the Vanguard Machinery team during the project delivery process, believing that this was not only an equipment purchase, but also a manifestation of trust in partners.

Vanguard Machinery will continue to use innovation as a driving force to provide efficient and reliable solutions to global customers and continuously promote the advancement of industry technology and the improvement of service levels. In the future, we look forward to performing well in more challenging environments and creating more glorious moments with our customers.

9 Major Differences Between Circular Vibrating Screen and Linear Vibrating Screen

Introduction

There are many types of vibrating screens. According to the movement trajectory of the material, they can be divided into circular vibrating screens and Linear vibrating screens. Both types are commonly used screening equipment in daily production. Today we will compare and see the difference between the two.

Classification of vibrating screens

According to the material movement trajectory of the vibrating screen, it can be divided into:

Linear vibrating screen: The material moves forward in a straight line on the screen surface;

Circular vibrating screen: The material moves forward in a circular motion on the screen surface.

There is no essential difference in the style and structural composition of the circular vibrating screen and the linear vibrating screen. The material is screened by the vibration of the screen surface, but the different vibration tracks will directly affect the purpose of screening.

Working principle

1. Circular vibrating screen

The motor drives the eccentric block of the vibrator to rotate at high speed through the V-belt, generating a large centrifugal inertia force, which stimulates the screen box to produce a circular motion with a certain amplitude. The material on the screen is subjected to the impulse transmitted by the screen box on the inclined screen surface and produces a continuous throwing motion. When the material meets the screen surface, particles smaller than the screen hole are screened, thereby achieving classification.

2. Linear vibrating screen

Using the vibration motor as the vibration source, the material is thrown up on the screen and moves forward in a straight line. The material enters the feed port of the screening machine evenly from the feeder and passes through the multi-layer screen to produce several specifications of oversize and undersize, which are discharged from their respective outlets.

Differences and comparisons

1. Movement trajectory

The material on the circular vibrating screen moves in a circular motion, and the material on the linear screen moves forward in a linear motion.

2. Exciter

The circular vibrating screen is also called a single-axis vibrating screen because the exciter is a single shaft and works by an inertial motor. The linear vibrating screen exciter consists of two shafts and works by the principle of vibration motor excitation, so it is also called a double-axis vibrating screen

3. Blockage phenomenon

The material on the circular vibrating screen moves in a parabolic circular trajectory on the screen surface, so that the material is dispersed as much as possible, thereby increasing the material bounce force, and the material stuck in the screen hole can also jump out, reducing the blockage phenomenon.

4. Installation layout

The linear vibrating screen reduces the screen height with a small screen surface inclination angle, for convenience for the process layout.

5. Screen surface inclination angle

According to the particle size of the material, the circular vibrating screen can change the screen surface inclination angle, thereby changing the material movement speed along the screen surface and increasing the processing capacity of the screen machine. Generally speaking, the linear vibrating screen has a small screen surface inclination angle in production.

6. Material

Generally speaking, the thicker plates use circular vibrating screens, and the box is made of manganese steel to resist the impact of materials during the screening process. The main materials of linear vibrating screens are made of light plates or stainless steel plates.

7. Applicable fields

Circular vibrating screens mainly screen materials with high specific gravity, large particles, and high hardness. They are widely used in mining industries such as mines, coal, and quarries.

Linear vibrating screens mainly screen fine particles, light specific gravity, and low hardness materials, especially for dry powder, fine particles or micro powder materials, and are usually widely used in food, chemical, building materials, and pharmaceutical industries.

8. Processing capacity

For the circular vibrating screen, since the exciter is arranged above the center of gravity of the screen box, the elliptical long axes at both ends of the screen box form a downward eight-shaped shape, and the upper end of the elliptical long axis at the feeding end faces the discharge direction, which is conducive to the rapid dispersion of the material, while the upper end of the elliptical long axis at the discharge end faces the discharge direction, which reduces the material movement speed and is conducive to the screening of difficult-to-screen materials. The arc-shaped screen surface also increases the effective area of the screen machine, thereby improving its processing capacity.

In addition, for difficult-to-screen materials, the circular vibrating screen can flip the main shaft, so that the vibration direction is opposite to the material movement direction, and the material movement speed along the screen surface is reduced (when the screen surface inclination angle is the same as the main shaft speed) to improve the screening efficiency.

9. Environmental protection

The linear vibrating screen can adopt a fully enclosed structure, without dust spillage, which is more conducive to environmental protection.

In the field of mining crushing, it widely used circular vibrating screens. In actual production, the choice of the circular vibrating screen or the linear vibrating screen mainly depends on the type of materials processed by the user and the application field. The different purpose of screening is to select different equipment.

What Is the Reduction Ratio of the Crusher?

 When purchasing crushers, especially jaw crushers for coarse crushing, we often see a word: large reduction ratio. So, what is the reduction ratio of the crusher? What are the commonly used calculation methods?

What is the reduction ratio of the crusher?

    After the ore is blasted, there are mostly large stones of different sizes. They must be crushed by the crusher before they can meet the needs of the project. So do these stones need single-stage crushing or multi-stage crushing? The reduction ratio is a very important factor.

The reduction ratio refers to the ratio of the feed particle size to the product particle size in the crusher, which indicates the degree of material crushing, which directly affects the energy consumption and processing capacity of the crusher.

Commonly used calculation method of reduction ratio

    The reduction ratio has a professional calculation method, which is divided into three types according to different situations:

1. Particle size reduction ratio:the ratio of large block size before and after crushing

Calculation formula:I = larger diameter of feeding material / larger diameter of finished product

    Due to the different habits of each, the large-granularity value method is different. British and American take the sieve width at which 80% of the material can pass through the sieve hole as the large particle size diameter. China and the Soviet Union, 95% of the material can pass through the sieve hole width as the diameter of the large particle size.

Application object:This calculation method is often used in quarries because the width of the feed port of the crusher should be determined according to the large particle size of the ore in the design.

2. Surface reduction ratio:the ratio of the width of the crusher inlet to the width of the outlet

Calculation formula:I=0.85B/S (inlet width/discharge width referred to here)

0.85 is the width coefficient of the crusher to accommodate the material. The value S of the width of the discharge port: the coarse crusher is different from the medium and fine crusher, and the former takes the larger width; The latter takes the smaller width.

Application object:Because this method does not need to do screening analysis of a large number of materials, the approximate calculation can be carried out until the width of the feed port and the discharge port of the crusher, which is simple and fast, so it is widely used in production.

3. Average reduction ratio:the ratio of the average particle size of the material before and after crushing.

Calculation formula:I=average particle size of material before crushing/average particle size of material after crushing

Application object:Because the size and shape of the ores before and after crushing are different, they can only be represented by the average particle size. Therefore, the crushing ratio calculated by the average particle size can reflect the degree of crushing more truly, so it is mostly used in theoretical research.

    In actual production, the appropriate calculation method of the reduction ratio should be selected according to the specific work content of the crusher.

A Detailed Explanation of the 7 Differences Between Cone Crusher and Jaw Crusher in Fine Crushing

 In the stone crushing production line, the reasonable configuration of crushing equipment plays a crucial role in increasing production and improving the stone shape and particle size distribution. Currently, the entire crushing production line process includes three main stages: coarse crushing, medium and fine crushing, and screening. In the fine crushing stage, there are many crushers to choose from. What kind of equipment is more suitable?

The structure and principle of the fine jaw crusher are similar to those of the jaw crusher. The working mode is the flexural extrusion type. The materials are squeezed and crushed in the crushing chamber composed of a movable and fixed jaw. The cone crusher adopts laminated crushing. The mortar wall continuously moves toward the crushing wall to squeeze the materials sandwiched between the two and crush them.

The difference between the two in actual production:

1. Production characteristics

Generally speaking, fine jaw crusher and cone crusher have the following characteristics:

1) The feed particle size range of the fine jaw crusher is relatively large, and it can generally process materials below 1000mm, while the cone crusher is relatively strict, generally requiring less than 300mm (depending on the specific situation of the product);

2) In terms of processing capacity, the cone crusher far exceeds the fine jaw crusher, generally up to 1000 t/h, more than twice that of the fine jaw crusher;

3) In processing hard materials, the compressive strength of the two is the same, between 300-350Mpa.

2. Overall structure

From the overall structure, the cone crusher is 1.7-2 times heavier than the fine jaw crusher with the same feed size, and the body is generally 2-3 times higher than the fine jaw crusher, so with a relatively large construction cost of the plant.

3. Processing materials

The cone crusher is not applied for crushing wet and sticky ores, while the fine jaw crusher can process almost all kinds of materials.

4. Feeding requirements

The cone crusher can be filled with ore and directly fed without adding silo and feeders. However, the fine jaw crusher cannot be filled with ore and requires uniform ore feeding, so it is necessary to set up additional silos and feeders, which increases the investment cost of auxiliary equipment.

5. Finished product particle shape

The finished products of the cone crusher are more needle-shaped, and compared with the fine jaw crusher, the shaping effect of the cone crusher is slightly better in general.

6. Price comparison

The cone crusher price is much more expensive than that of the fine jaw crusher.

7. Use and maintenance

We know that no matter which kind of crushing equipment, it is inevitable to do regular inspections and maintenance. Despite the high initial investment cost of the cone crusher, a low failure rate in the later stage, the long replacement cycle of wearing parts, and the convenient maintenance and repair, which saves a lot of manpower and material investment.

We know that it is uncertain to choose which equipment to use for medium and fine crushing through the comparison of the above characteristics. We should consider it comprehensively when purchasing. Considering the equipment cost, when both equipment can meet the crushing needs and the required quantity is the same, we generally choose the fine jaw crusher; For large-scale factory production operations, it should apply the cone crusher; When crushing wet and sticky ores, it should apply the fine jaw crusher; When processing flake or long-strip hard ores, it should apply the cone crusher is suitable. The specific equipment selection still depends on the user's production requirements.

What to do if there is too much Stone Powder in Machine-made Sand? 6 Ways to Control Stone Powder

 Four forms of stone powder in machine-made sand:

(1) Free powder: Stone powder particles do not adhere to each other or adsorb on the surface of sand and can move freely under the action of wind and gravity.

(2) Agglomerated powder: Stone powder particles are tightly aggregated together to form larger stone powder agglomerates, and the particles adhere to each other and aggregate. This type of stone powder aggregate is difficult to remove by traditional powder classification equipment due to the large particle size and mass of the agglomerates.

(3) Adherent powder: Stone powder particles are attached to the surface of larger sand particles. When the surface of the sand particles is relatively smooth, the stone powder particles are easy to remove under mechanical force, but when the surface of the sand particles is uneven, the stone powder particles and the sand particles tightly adhere to each other, and it is difficult to separate them by general mechanical methods.

(4) Cracked powder: There are often some natural cracks on the surface of sand particles, which are tens to hundreds of microns wide or generated by mechanical crushing. These cracks are often filled with a large number of stone powder particles. This is the most compact way of stone powder adhesion.

Stone dust control technology

The 6 types of stone dust control technologies and equipment are as follows:

1. Feeding vibrating grate screen

The increased mud content in machine-made sand will increase water demand and affect the strength of concrete, thus affecting its compression capacity. Therefore, before the raw materials enter the sand making process, they need to be sifted and discarded, which can significantly reduce the moisture content of the raw materials.

According to different material conditions, select the appropriate screen bar spacing to achieve different mud removal effects; For working conditions where the mountain bark is thick, the vegetation is difficult to remove, the mountain is severely weathered, and the interlayer contains large amounts of mud, which is easy to mix with soil, increasing the spacing between screen bars can effectively reduce the mud content.

2. Aggregate chute powder removal device

A certain specification of aggregate from the screening machine enters the aggregate unloading chute after the screening. An integrally detachable diffusion air distribution chamber is arranged in a suitable place, and the blower is connected to it. In this way, the free dust on the aggregate surface is blown up by the blower when passing through the chute and is collected in the dust collector under the suction effect of the dust collector.

In addition, the suction volume of the dust collector can be controlled by adjusting the pipeline regulating valve. When the blower adopts the variable frequency form, the ratio of blowing and suction is adjusted by the variable frequency control of the blower and the adjustment of the regulating valve, to realize the continuous control of the powder content of the finished sand and gravel aggregate within a certain range.

3. High frequency vibration screening pretreatment

Basic principle: The machine-made sand is preprocessed by high-frequency vibration to disperse the powder, separate the powder, coarsely and finely classify the sand, and then remove the stone powder contained by the wind.

Specific method: After the material is crushed by the sand making machine when it enters the screening module, it can be bulked through the bulker or the spiral material lever. This has a preliminary dispersion effect on the agglomerated and adhered stone powder and improves the quality of the material. The uniformity of distribution, at this time, the stone powder can be selected through the air separation device. After primary classification, the materials enter a high-frequency vibrating screen with a vibration frequency of 60-80HZ and an amplitude of 0.15-2.4mm for screening. The vibration intensity of this equipment is 3.5-5 times that of ordinary equipment, which can generate greater mechanical force and has a good dispersion and separation effect on agglomerated stone powder and surface-adhesive stone powder. At the same time, the coarse and fine classification of machine-made sand is efficiently achieved.

Compared with ordinary vibrating screens, the powder removal efficiency of machine-made sand after being screened by high-frequency vibrating screens is significantly increased by about 40%, and the required air volume is reduced by 45%.

4. Centrifugal powder classifier

The powder classifier is used in the sand making process. Its main function is to separate excess stone powder and useful particles and recycle them separately.

Its working principle is: to mix gas and powder to form a gas-solid two-phase flow. The rotating scattering disc and high-speed airflow make the powder-containing airflow obtain centrifugal force during rotation. The centrifugal force obtained by particles of different particle sizes is different, thereby realizing the separation of coarse and fine powder particles. At the same time, the coarse and fine powder particles are recycled separately by corresponding methods. The useful particles are the finished sand, and the useless fine powder is the waste material.

From the position of the powder separator installed in the building station, it is divided into raw material powder classifier and finished material powder selection process layout. The powder classifier has strict requirements on the moisture content. When the moisture content of the feed is higher than 5%, the powder removal efficiency of the powder separator will be seriously reduced. When the moisture content of the feed is 2%, the powder separator can better exert its efficiency, and the sand formation rate is between 60%-70%.

5. V-type static classifier + dynamic high-efficiency classifier

The raw materials enter the sand making machine, and after vibration screening, the coarse powder returns to the sand making machine, and the fine powder is sent to the combined classifier of the V-type static classifier + dynamic high-efficiency powder classifier. After being homogenized by the material distributor, it enters the classification system, the coarse particles enter the finished product warehouse, and the fine particles and fine powder enter the dynamic classifier with airflow. By adjusting the speed of the dynamic powder selector, the sand and gravel classification is adjusted, and the qualified products are discharged from the coarse powder pipe into the finished product warehouse. Adjust the particle grading of the finished product, and the fine powder is collected by the cyclone dust collector with the airflow and enters the stone powder warehouse. The airflow enters the V-type air inlet through the circulating blower.

6. Air Screen

The air screen combines wind separation technology based on vibration screening to realize the three functions of particle size adjustment, grading and screening.

Its working principle: The material is evenly spread under the action of the air screen dispersion device and blown to different positions of the air selection chamber by the blower. The lighter the material (the smaller the particle size), the farther it is blown away and the longer the screening distance; The lightest stone powder will be blown to the powder outlet position, adsorbed by the dust collector-induced draft blower, and finally concentrated in the powder tank. At the same time, the particle size adjustment plate automatically adjusts the proportion of the returned material to fine-tune the fineness modulus of the finished sand, thereby ensuring the stability of the fineness modulus of the finished sand.

For the dry sand making system using an air screen, the raw materials need to control their moisture content below 1.6% (surface moisture content 0.6%), without mud, and the feed particle size is 0-25mm and the gradation is continuous. If the raw materials change, the system capacity will change accordingly. If the raw materials contain too much mud or stone powder, separation processes such as powder classifier or powder removal equipment need to be used in the front stage.

Vanguard Machinery Brings New Technology to WAMPEX 2024: Jointly Planning for Ghana's Mining Development

 With the vigorous development of the global mining and energy industry, the continued growth of demand for mining and energy has become a significant phenomenon, bringing unprecedented opportunities and challenges to the mining machinery and equipment industry. This increase in demand has not only promoted the expansion of the industries but also promoted technological innovation and product upgrading. To continuously explore overseas markets, expand sales channels, enhance brand awareness, and achieve sustained business growth, our company is scheduled to participate in the WAMPEX 2024 West Africa Mining and Power Expo to be held in Accra, Ghana from June 5 to 7, 2024, to showcase the latest mining machinery equipment technology and solutions. We sincerely invite you to visit booth C13, communicate face-to-face with our professional team, and discuss the development of Ghana's mining industry.

According to data from the Ghana Mining Department, Ghana's mining output value has grown steadily and mining investment has continued to increase. China is one of Ghana's largest suppliers of mining machinery and equipment, and cooperation between the two countries in the mining field is becoming increasingly close. At the same time, according to data from the General Administration of Customs of China, Ghana is also one of the important import markets for China's mining machinery and equipment. In recent years, bilateral trade cooperation has grown steadily, providing strong support for Ghana's mining development.

Vanguard Machinery has always attached great importance to the development of the African market, which is one of our strategic priorities. In the past few years, we have achieved a series of important results in the African market. Through close cooperation and an in-depth understanding of local customers, we provide customized solutions for various industries in Africa, covering mining, infrastructure construction and other fields.

Our products have been widely recognized and praised in the African market, and their stability, efficiency and reliability are highly trusted by customers. We have established long-term and stable cooperative relationships with African customers, jointly promoting the development of local economies and the progress of engineering construction.

As a professional mining equipment manufacturing company, Vanguard Machinery is committed to innovative design, improving product quality, improving product lines, and providing customers with all-round support and guarantees based on the full life cycle service concept. Our R&D team cooperates with top scientific research institutions at home and abroad to continuously explore new technologies and processes to meet the growing needs of customers. The production process is strictly implemented following the quality management system to ensure that every piece of equipment reaches the highest standards. In terms of sales and after-sales service, we always adhere to "customer first" and provide customers with professional consultation, solutions and around-the-clock service to ensure customer satisfaction and stable equipment operation.

The WAMPEX 2024 exhibition is about to open. This is an important platform to gather industry elites and discuss future development trends. Vanguard Machinery looks forward to communicating and cooperating with you at the exhibition site, working hand in hand with global partners, and jointly promoting the sustainable development of the mining and energy industries. Let's meet at WAMPEX 2024!

There is Serious Sand Loss in the Sand Washing Production Line. How to Remedy it?

 As we all know, among the reasonable and environmentally friendly configuration methods of the entire sand making production line, it is a popular trend to equip pulse dust collector and water-washed sand washing machine. In the wastewater of wet sand washing, fine and powdered sand is inevitably lost in the water flow. Each production line loses about 5%-25% of the content. Calculating the loss in a year is also very alarming. If these lost parts are collected back, this part of the profit will also be very considerable. This article shares four methods of fine sand recycling.

Sand washing machine classification

Sand washing machines are divided into wheel sand washing machine and spiral sand washing machine. Wheel sand washing machine is widely used for washing and classifying materials in mining, building materials, chemical industry, transportation, concrete mixing stations and other fields. The sand washing process is a circular motion. Spiral sand washing equipment uses the propelling action of spiral blades to clean soil. Compared with wheel sand washing machines, spiral sand washing machines have a higher cleaning efficiency and better cleaning effects on stones. In the same way, the different specific gravity of sand, mud, and water are used to extract the sand, and the water and mud flow away along the chute.

However, no matter which type of sand washing machine is used, in the process of stirring the water source, most of the sand will inevitably be picked up, and the separation will not be clear and it will flow away along the sink. Then it inevitably caused most of the losses.

Four methods of fine sand recycling

1. Multi-stage sedimentation tank sedimentation method

The sand washing wastewater flows into the sedimentation tank, which is preferably equipped with 3 layers. It will settle layer by layer over time. Since the specific gravity of sand and mud is relatively heavy, they can be separated after a relatively long time.

Of course, this method also has disadvantages. The long-term sedimentation process takes up a large area of the sedimentation tank. In the later stage, manual excavation of sedimented sand and sedimentary mud is required, which consumes lots of time and manpower.

2. Equipped with dewatering screen equipment

Discharge the sand washing wastewater directly onto the linear dewatering screen surface to recover the lost sand.

The disadvantage is that if the raw material contains little or no mud, there will be no problem. However, if it contains too much mud, the last step will be useless and the recycling effect will not be achieved at all. What is recycled is still a mixture of sediment and sand.

3. Fine sand recycling machine device recovery

Drain the sand washing wastewater directly into the lower water tank of the fine sand collector. Use a slurry pump to pump the mixed sand and mud water to the cyclone separator and then discharge it to the screen surface. The fine sand part is discharged along with the screen surface, and the mud and water flow back to the sewer tank, forming a cycle to continuously extract sand from the wastewater.

No other faulty or theoretical problems have been found yet, and this fine sand recycling device is relatively recognized on the market.

Two points should be paid attention to when operating the fine recycling machine: first, do not feed materials when starting up. It is recommended to feed materials after idling for a few turns. This is more reasonable and can also reduce the burden on the equipment; Second, the overall power must be taken into consideration when configuring the transformer. Configure more voltage appropriately to ensure that the equipment can work normally and will not operate at low voltage.

4. Add chemicals

Discharge the lost sand water into the sinking tank, and add a chemical agent that can cause the mud and sand to quickly condense into floc, thereby achieving rapid separation of sand, mud and water. However, this method is mostly used in the coal slime industry to recycle clean and fine coal. Its use in sand and gravel quarries has certain limitations and cannot be popularized for the time being.