What are the problems encountered in sand aggregate production line?

Product introduction:https://www.lvssn.com/epc/Aggregate-Production-Line.html

With the joining of cement enterprises, the appearance of sand aggregate industry is gradually developing to scale, environmental protection, ecology and sustainability.However, due to the diversity of raw materials and markets and the uneven level of design units, most production lines cannot fully achieve the original intention and purpose of the investors after being put into production, or there are various problems in the operation process.What are the problems encountered in sand aggregate production line?
 

1. Improper equipment selection

 

Reasonable equipment selection is the primary factor to determine the success of a production line.Equipment selection of sand aggregate production line mainly depends on physical properties of raw materials (such as hardness, abrasion index of raw materials, soil content, etc.).Because there are many production line investors did not find a formal company design, by directly copying the equipment selection of other enterprises for construction, after the operation of the equipment selection is not reasonable.This problem is difficult to solve by adjusting the process, the production enterprises have to replace the extrusion crusher equipment to ensure the long-term stable and economic operation of the production line.Therefore in the choice of manufacturers must choose the strength of equipment manufacturers or formal company design production lines.Jiangsu LVSSN has a number of design lines, you are welcome to visit.
 

2. Improper design of silos or warehouses

 

Silos or silos of sand aggregate production line mainly include coarse feed silos, medium and fine break and sand buffer silos and product storage warehouses.
 

(1) coarse feed bin

The common problem of coarse feeding bin is that the side discharge port of the bin is designed as a rectangular "door" structure. There is a dead Angle between the warehouse and the discharge port, material feeding is not smooth enough, and large pieces of material are easy to accumulate here, which affects the normal feeding.The simple measure to solve this problem is to place an excavator beside the feeding mouth to clean up the accumulated material at any time.In the off-season of the market, the feeding bin side outlet is transformed into a trapezoidal "inverted eight" structure, so as to eliminate the dead corner of the product.
 

(2) medium and fine crushing and sand making buffer bin

The common problem of medium fine breaking and sand making buffer bin is that the bottom of the bin is designed as a steel bin structure with flat bottom. Because the overall material pressure at the bottom of the bin is relatively large, serious deformation and subsidence of the bottom of the steel bin will occur during the operation of the sand and stone aggregate production line, resulting in safety risks.The improvement measures can be taken to strengthen the structure of the bottom of the warehouse.The design unit shall try to avoid the use of flat steel structure in the design, and try to choose concrete structure at the bottom of the flat steel structure when it is inevitable to choose flat steel structure.
 

(3) product repository

Product storage is generally in the form of concrete storage, with large and stable reserves. However, some enterprises choose steel silos to store sand and stone aggregates. It is hoped that these enterprises can regularly check the wear condition of steel silos and carry out wear resistance treatment.
 

3. Wear of material slide

 

Due to the multi-edge and Angle characteristics of aggregate intermediate products, the high abrasion characteristics of some raw materials and the large delivery gap of some materials, the impact wear of most runways in the conveying process is serious and the service life is short.This problem can be improved by laying cast manganese steel or other material lining board inside the impact-heavy slide.Change the structure form of the slide with less impact, and form the abrasive material inside the slide, and thicken the slide steel plate under the condition of conditions.However, when conveying soil materials, it is recommended to adopt thickening treatment for the slide, and it is not necessary to adopt the design of abrasive ladder slide, because the structure of abrasive slide is easy to cause the clogging of soil materials on the slide.

The above is only a small part of the problems in the aggregate production line. If you encounter other problems in the aggregate production line, please contact us and we can propose solutions for you.

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Jaw crusher stuck material solution

Product introduction:https://www.cementepc.net/crusher/Jaw-crusher.html

In the working process of jaw crusher, sometimes there will be stuck material can not be ore, directly affect the subsequent production.So, what are the reasons for jaw crusher stuck?What is the solution of jaw crusher stuck material?
 

1. The material has high water content or high viscosity

In the working process of jaw crusher, if the water content of the ore is higher, into the crushing chamber, containing water after the material is broken into small pieces, will mutually adhesion together, block in the crushing chamber of the two jaw plate directly, resulting in material jam.Or the material mixed with more viscous dilute soil, so that the material is stuck into a block of broken cavity, the phenomenon of material jam.If this is done for a long time, not only will the production efficiency be affected, the material attached to the jaw will corrode the jaw and accelerate its wear.
 

Solution for material with large water content:

Before the material enters the jaw crusher, the material is screened and prepared for dehydration to reduce the moisture and viscosity of the material.Dehydration can choose natural air drying air drying, or choose the configuration of drying equipment.

2. The feeding amount is too large

In the production process of jaw crusher, some operators in order to speed up the production schedule, increase the amount of feed, beyond the normal production capacity of jaw crusher, materials in the crushing chamber can not be broken in time, resulting in stuck materials.
 

Solutions to excessive feeding:

Professional training should be given to operators to make them familiar with the knowledge of jaw crusher, so as to achieve continuous and stable feeding and effectively reduce the occurrence of material jam.
 

3. Improper adjustment of discharge port

The occurrence of material stuck phenomenon may also be because the discharge port is too small, the broken material can not be discharged in time, a large number of piles in the broken cavity, resulting in stuck material.
 

Solutions to improper adjustment of discharge port:

Adjust the outlet of jaw crusher properly, increase the size of outlet, so that the crushed material can be discharged from the outlet smoothly.

4. Do not know the parameters of jaw crusher

Before use, there is no first clear jaw crusher parameters, especially the requirements of material properties.Material does not meet the requirements of the production process of jaw crusher, after entering the crushing chamber, it can not reach the ideal crushing effect, resulting in a decrease in production efficiency, resulting in material stuck phenomenon.
 

Do not understand the jaw crusher parameters solution:

Before using the jaw crusher for production, it is necessary to make clear the parameters of the jaw crusher, especially the requirements of material properties.According to the related requirements of jaw crusher for materials (such as size, hardness, etc.), put suitable materials.

Stuck material is a very easy phenomenon in the production process of jaw crusher, but as long as the cause is found, it is easy to solve the problem according to the correct method.

The page source:https://www.cementepc.net/company/Jaw-crusher-stuck-material-solution.html

What factors affect the output of the cone crusher?

Product introduction:https://www.lvssn.com/crusher/Cone-crusher.html

As a kind of ore crushing equipment, cone crusher is usually used for medium and fine crushing operations in concentrator.In addition to the equipment operating parameters and material properties, such as eccentricity, ore discharge port, material crushing power index, water content, etc., the feeding process conditions and equipment layout will affect the operation of the cone crusher.
 

1. Influence of pre-screening

When the ore is broken in the crushing chamber, there is a certain gap between the particles.If the gap between the particles is less, the "space" required for the larger particles to break is insufficient, then it is difficult to break the material

In general, the feed of the medium crushing cone crusher comes from the discharge of the coarse crushing jaw crusher.Due to the influence of the raw material source and the insufficient pre-screening of the coarse crushing section feeder, the coarse crushing jaw broken discharge contains a lot of fine materials (smaller than the medium crushing cone broken discharge mouth or the materials that can directly enter the next crushing section), so the pre-screening equipment should be added before the medium crushing cone crusher.

On the one hand, the particles with smaller particle size in the crushing and discharging materials are separated in advance to ensure that there is sufficient space between the bulk materials in the crushing and feeding materials, which is conducive to strengthening laminating and crushing, improving crushing efficiency and reducing lining consumption.

On the other hand, after screening the material can be directly into the fine crushing operations (such as fine cone or vertical shaft impact broken), improve the processing efficiency of the whole production line.

 

2. Influence of feed particle size composition

Different from the medium crushing cone crusher, the feeding of fine crushing cone crusher is the product on the screen of pre-screening operation, and the range of particle size of feeding is relatively narrow.Therefore, according to the different feeding particle size composition of the fine crushing cone crusher, it is necessary to select the appropriate crushing cavity type to make the material fill the whole crushing cavity from large to small.

If the feed particle size is coarse, the ore crushing mainly occurs in the upper part of the crushing chamber, the actual running power of the motor is small, the upper lining wear is serious, the service life of the lining is shortened.

If the feed particle size is too small, the ore crushing mainly occurs in the lower part of the crusher, the lower part of the plate is seriously worn, the actual crushing power is low, and the unit crushing cost is increased.

Both of them will cause the actual operation power of the cone crusher is low and the lining plate is irregularly worn, which will shorten the service life of the lining plate and increase the production cost.

 

3. Influence of feeding equipment layout

 

(1) warehouse form

If the site area is large, the combination of underground bin and high bin can be adopted.

The underground material storage has a large amount of material, which can avoid the problem of broken jaw of the coarse crushing section due to the delayed processing of the middle crushing cone, and the problem of insufficient operating rate caused by the fault of the coarse crushing section.

In high buffer bin, the capacity of the crusher should be guaranteed to run for 15-20 minutes.This bin can ensure that the center of the cone machine is full of feeding materials, reduce the impact of materials on the cone machine's feeding barrel, further adjust the position of field equipment installation, and avoid the disadvantages of the feeding belt machine that once the cone breaks suddenly and stops running, the feeding belt machine needs to stop starting with materials.
 

(2) feeder

The vibration feeder is installed in the discharge port of the medium and fine crushing bin, which can reduce the belt wear and fracture to a great extent while effectively controlling the feeding amount, especially the feeding of the medium crushing crusher.If the installation of vibration feeder, crusher feed amount by vibration feeder frequency conversion control, belt machine running at constant speed.

For the feeding belt machine, in the premise of ensuring the amount of ore feeding, should choose the appropriate belt width, to ensure the slow speed, in order to reduce the fall of the belt material precipitation, reduce the impact on the crusher feeding barrel.When the belt width is small, the material guide groove can be installed on the whole length of the belt to increase the thickness of the belt material.The feeding belt machine of the cone crusher is designed to be movable. First, it is easy to adjust the feeding point, so that the material falls in the feeding barrel of the crusher.The other is to provide enough space for equipment maintenance.

 

4. What measures can be taken to ensure that the cone is packed with feeding materials

(1) buffer ore bin with a certain capacity is set before the medium fine cone crusher to ensure the feeding stability of the equipment;

(2) the maximum feeding capacity of the feeding equipment is greater than the maximum production capacity of the crusher;

(3) if there is no ore bin, but the actual production capacity of the system is less than the design capacity, and the handling capacity of the equipment cannot be adjusted, it is recommended to set a high and low material level meter in the fine material bin:

When the material level is low, the equipment stops feeding and the crusher idles or stops.

When the material level is high, the equipment starts to feed to ensure that the feeding amount meets the requirement of crusher to fill the material evenly.

In the crushing before adding pre-screening, can be pre-separated in the crushing cone crusher feed in the fine particle size of the material, can reduce the load rate of the crusher, to ensure that there is more abundant space between the large pieces of material in the feed, help to strengthen the laminating crushing, improve the efficiency.For the different feeding particle size composition of the fine cone crusher, it is necessary to choose the appropriate crushing cavity, so that the material from large to small fills the whole crushing cavity, in order to give full play to the excellent performance of the cone crusher.Through proper arrangement of feeding equipment, the precipitation of materials can be reduced as far as possible, so as to achieve even crowding feeding, enhance laminating crushing effect, reduce energy consumption per unit of ore crushing, and reduce production cost.

The page source:https://www.lvssn.com/Product/What-factors-affect-the-output-of-the-cone-crusher.html

Comparison of three kinds of discharge opening adjustment modes of jaw crusher

Product introduction:https://www.cementepc.net/crusher/Jaw-crusher.html

The size of the discharge port of the jaw crusher determines the size of the ore after crushing and the production capacity of the equipment.Due to the change of wear and size of finished products, it is necessary to adjust the size of discharge port from time to time. The time and efficiency of different adjustment methods are different, and the convenience is also different.The following is a look at the board type, wedge block type and hydraulic cylinder type of these three main regulation.

1. Backing plate type

The adjusting backing plate is generally located behind the inner bracket seat of the adjusting seat.When the discharge port needs to be adjusted, the number of backing plate can be increased or decreased, and the total thickness of the backing plate can be changed, so that the front and rear position of the elbow plate can be changed, and the front and rear position of the lower part of the movable jaw can be moved to realize the change of the size of the discharge port.
 

(1) insert the backing plate from behind the broken jaw

Adjust the backing plate inserted from the back of the crusher, the length of the backing plate is shorter, the weight is lighter.The operator's operating space is limited, so it is not convenient to replace the pad.

(2) insert the backing plate from the side of the jaw crusher

Adjust the plate inserted from the side plate of the crusher, the plate is longer and heavier.The operator's operating position is better and safer.

Plate adjustment is relatively simple, but, often inconvenient, add or subtract plate adjustment discharge port difficult, need to be placed near the crusher, on the one hand, take up space, on the other hand to prevent loss.No stepless adjustment, no automatic adjustment by hydraulic means.
 

2. Wedge block type

The wedge type regulating device mainly consists of two identical wedge blocks.The wedge-shaped blocks are located behind the bracket in the adjustment seat, and the inclined planes of the two wedge-shaped blocks are relative to each other. By changing the relative position of the two wedge-shaped blocks, the total thickness of the wedge-shaped blocks can be changed, so that the front and rear position of the bracket can be changed and the front and rear position of the lower jaw can be moved to realize the change of the size of the discharge port.
 

2.1 mechanical regulation

Mechanical regulation means that the movement of wedge blocks is realized by manually rotating the adjusting screw.The adjusting screw is located on both sides of the crusher.One end of the adjusting screw is connected with the wedge-shaped block through the pin shaft, and is mounted on both sides of the side plate of the crusher frame by means of adjusting nut and support.When the discharge port needs to be adjusted, the two wedge-shaped blocks can be pulled by turning the screw on both sides of the frame with a wrench to change the relative position of the two wedge-shaped blocks, and then the total thickness of the wedge-shaped blocks can be changed to adjust the size of the discharge port.
 

2.2 hydraulic regulation

Hydraulic regulation, is the mechanical regulation of the adjusting screw into the hydraulic cylinder, and the adjustment of the spring also through the hydraulic cylinder to achieve, so that the automatic adjustment of the discharge port, convenient and labor saving.
 

3. Hydraulic cylinder type

The adjustment device of the discharge port of the hydraulic cylinder is equivalent to installing a large oil cylinder in the middle of the elbow plate, so that the length of the elbow plate becomes stepless to adjust and change, thus changing the front and rear position of the moving jaw to realize the adjustment of the discharge port size.

The adjustment device of this kind of structure can not only automatically adjust the size of the discharge port, but also realize the function of passing iron and clearing cavity, which is convenient to operate and reduce labor intensity.

But the jaw crusher would be more expensive to make and would require workers' operating and maintenance skills.

To sum up, the pad type is the simplest, but inconvenient to operate;The wedge-shaped block type can be adjusted automatically and the operation is more convenient.The hydraulic cylinder type can not only adjust the discharge port automatically, but also realize the function of passing iron and clearing the cavity, which is easy to use and reduces the labor intensity of the operator.

However, with the development and progress of the society, the hydraulic cylinder type adjustment device will be used more and more, and become the main discharge mouth adjustment mode of jaw crusher.

The page source:https://www.cementepc.net/Industry/Comparison-of-three-kinds-of-discharge-opening-adjustment-modes-of-jaw-crusher.html

What are the differences between a simple pendulum jaw crusher and a compound pendulum jaw crusher?

Product introduction:https://www.lvssn.com/crusher/Jaw-crusher.html

Jaw crusher as a widely used primary crushing products, we use more is the compound pendulum jaw crusher, today I will take you to understand the simple pendulum jaw crusher and compound pendulum jaw crusher what is the difference?

 

1. How it works

 

1.1 simple pendulum jaw crusher

Crushing principle: movable jaw suspension on the heart axis, can make left and right oscillation, eccentric axis rotation, connecting rod do up and down reciprocating movement, drive two thrust plate also do reciprocating movement, thus promoting movable jaw do about reciprocating movement, to achieve crushing and unloading.

This moving jaw is a kind of about reciprocating movement, moving jaw on each point movement track is the center of the suspension axis arc line, the movement track is simple, so called simple pendulum jaw crusher.
 

1.2 compound pendulum jaw crusher

Principle of crushing: the motor drives the eccentric shaft to rotate through the belt and pulley, and the movable jaw makes periodic reciprocating movement around the eccentric shaft to the stationary jaw plate, sometimes close to and sometimes away from it. When the movable jaw plate is close to the stationary jaw plate, the ore between the two jaws is crushed, bent and split.When the movable jaw plate leaves the fixed jaw plate, the broken ore is discharged through the discharge port of the crusher under the action of gravity.

The movable jaw is directly suspended on the eccentric shaft. When the eccentric shaft rotates counterclockwise, it can directly drive the movable jaw to make complex oscillation.The movement track of the moving jaw from top to bottom: the movement track of the broken cavity is elliptical;In the middle of the crushing cavity, the movement track is a flatter oval.At the bottom of the crushing chamber, the movement track is almost reciprocating.Because the motion track of each point on the moving jaw is more complex, it is called complex oscillating jaw crusher.

Although they have different types of structures, they basically work in the same way, except that the movement of the jaw is different.

 

2. Comparison of advantages and disadvantages

 

2.1 simple pendulum jaw crusher

 

Advantage:

(1) compact and simple structure;

(2) eccentric shaft, connecting rod and other transmission parts of the force is small, industrial made of mainframe and medium-sized machine, used to break hard materials;

(3) less wear of movable jaw plate;

(4) the vertical stroke (vertical movement distance) of the moving jaw is small, the wear effect of the ore on the jaw plate is light, and the over-commination of the product is less.
 

Disadvantage:

(1) low crushing efficiency;

(2) more flake products.

 

2.2 compound pendulum jaw crusher

 

Advantage:

(1) lighter weight (about 20-30% lighter when the production capacity is equal), fewer components and more compact structure;

(2) the degree of filling in the crushing chamber is good, the packed material block is evenly broken, and the productivity is high, 20-30% higher than the simple pendulum type of the same specification;

(3) there are more finished products in the shape of cube with better quality.
 

Disadvantage:

The wear of jaw board is fast, the product is too crushed serious, the dust that produces is more also.

In the beginning, the double pendulum jaw crusher is generally made of small and medium-sized, because it is in the process of crushing ore, the moving jaw is subjected to huge extrusion pressure, and most of the action on the eccentric shaft and bearing above, resulting in the eccentric shaft and bearing stress deterioration, easy to damage.However, with the emergence of large impact bearing, compound pendulum jaw crusher is gradually becoming larger.

The page source:https://www.lvssn.com/Product/What-are-the-differences-between-a-simple-pendulum-jaw-crusher-and-a-compound-pendulum-jaw-crusher.html