Sand making machine production process of stone crusher mill plant Professional Answer:
In the mechanical sand, it is mainly divided into two parts: soft rock sand making and hard rock sand making. The biggest difference between the two is that the compressive strength of the finished material is not the same, such as basalt, granite, pebbles and other hard rock sand made of physical properties closer to natural river sand, but the production wear cost is also large, the price is relatively expensive compared to limestone and other soft rock sand. For hard rock sand making, we mainly recommend the hydraulic roller sand making machine, that is, we often say that the roller (grinding) sand making machine.
Combined with Shandong Sanxiang Heavy Industry Co., LTD., many years of experience in the production of sand making machine, and as a professional crusher manufacturer, from the perspective of use to help you answer the question of the production process of sand making machine, I hope to help you.
One: What is machine-made sand?
A: Mechanical sand refers to the sand processed by the stone sand making machine and other ancillary equipment, which can be processed into different rules and sizes of sand according to different process requirements. The biggest difference with river sand is that machine sand is not naturally formed, but in the face of massive market demand, the role of machine sand is becoming more and more important.
Two: What equipment is usually required for stone machine sand production line?
A: Mechanical sand production line usually needs sand making machine, vibration feeder, jaw crusher, hammer crusher, cone crusher, impact crusher, vibrating screen, belt conveyor, sand washing machine and other equipment, according to different process requirements, various types of equipment to meet the different process requirements of customers. Shandong Sanxiang stone crusher mills machine factory now mainly produces sand making machine series, including for soft rock crushing counter-hammer sand making machine and for hard rock crushing roller sand pressing machine, rod grinding sand making machine, impact sand making machine and other models for sale.
Three: Advantages of machine-made sand compared with natural sand:
A: 1) Stable supply
Natural sand due to years of mining, less and less resources, short supply, soaring prices, and supply and quality is not guaranteed; The machine sand raw materials are sufficient, urban construction waste (construction waste), gravel tail, waste, stone chips, stone slag, mine tailings, etc., can be used as the machine sand raw materials.
2) Price
The price of machine-made sand is not the same everywhere, but it is basically much cheaper than river sand, and compared with river sand, machine-made sand is about 20 yuan cheaper per ton. In addition, machine-made sand is also quite profitable.
3) Environmental protection
The traditional mechanism of sand production does bring environmental problems such as dust pollution, but with the continuous improvement of the sand making process, the production is now basically using a completely closed structure, and each machine port has a spray setting, dust does not spill, and the environmentally friendly dry process, does not need to wash, does not produce sewage, silt, dust and other problems.
4) adhesion, life
When the granularity of machine-made sand is used for structural bonding such as cement, it often has better adhesion, greater pressure resistance, and longer service life.
Four: What are the main advantages of the dry production process?
A: The main advantages of the dry production process are:
1) The produced mechanical sand moisture content is low, generally less than 2%, commercial mixed dry mortar can be used directly.
2) The content of stone powder in the finished sand is adjustable and controllable, and the centralized recycling can be comprehensively utilized to reduce dust emission.
3) Little or no water is used in the production process to save water resources and protect the environment.
4) Easy to centralized operation control, to achieve automatic management.
5) It is not affected by drought and cold seasons and can be continuously produced throughout the year.
Five: Why is the wet production process being used less and less?
A: The main reasons are:
1) Consume a lot of water, 1t of sand and stone requires water consumption of 2-3.5m.
2) The product has high sand water content, must be dehydrated, dry mixed use must be re-dried.
3) The product sand fineness modulus is coarse, and the sand yield is low.
4) Produce a lot of mud powder sewage, pollute the environment, and stone powder is not easy to recover.
5) There are many types of infrastructure investment and equipment, and the production cost of machine-made sand is high.
6) It cannot be produced normally in arid and rain-less areas or during the icing season.
Six: What are the characteristics of the semi-dry sand process?
A: The semi-dry production process is relative to the wet production process, the biggest feature is to wash off the mud and stone powder on the surface of the sand making raw materials with water, and the finished sand is no longer washed partially or completely, so the water consumption is relatively less, the stone powder loss in the finished sand is less, and the water content is lower. However, this sand and stone production process still requires more water resources, and sewage treatment devices must still be equipped, but the specifications are much smaller. Its investment cost is less than the wet method, more than the dry method, the finished sand powder content is between the two, and the operating cost is also between the two.
Seven: What is the mechanical sand methylene Blue (MB) value?
A: An indicator used to determine whether the content of particles smaller than 0.075mm in machine-made sand is mainly soil or stone powder with the same chemical composition as the parent rock being processed. The methylene blue value of the sand is required to be MB or less than 1.4, and it is better to control it below 1.0.
Eight: Why should the finished sand be humidified and mixed?
A: In the machine sand dry production process, the humidification and mixing treatment of the finished machine sand can make the water content of the machine sand and stone reach the saturated surface dry state, which is conducive to the control of the water consumption of the subsequent concrete mixing, and can reduce the segregation and dust during the transportation process.
Nine: Why is the fineness modulus of machine-made sand unstable?
A: In the production process, the feed lithology, water content and grading are easy to change, the screening process will also appear plugging, damage and other problems, crushing, dust removal equipment efficiency, parameters are also unstable, easy to lead to the mechanical sand fineness modulus is unstable, which requires timely maintenance of the machine, if it is found that the need to replace the relevant parts, Please timely call Shandong Sanxiang Heavy Industry Co., Ltd. crusher parts sales phone for parts ordering work.
Ten: Production mechanism can sand use waste concrete, masonry?
A: Waste concrete, masonry and industrial waste through special equipment through the sorting, cleaning, crushing, screening and other processes to produce machine-made sand. However, the current industry is mainly used for the production of recycled coarse aggregate.
11: What is the basis of artificial sand and stone production process?
A: The basis for the selection of dry method, wet method and semi-dry artificial sand and stone production process:
1) First of all, it depends on the region and water resources of the machine-made sand and gravel system, the cleanliness of raw materials, and the specific requirements for aggregate, machine-made sand and gravel powder content and fineness modulus. If the original conditions permit, the dry production process is preferred, followed by the semi-dry production process, and finally the wet production process.
2) From the equipment investment, the size of the floor area, the difficulty of production management, the cost of processing sand and gravel, the dry method is also given priority, followed by the semi-dry method, and finally the wet method.
Twelve: How to sample machine-made sand?
A: The general method of sampling for mechanical sand detection is:
1) When sampling on the material pile, the sampling part should be evenly distributed. Before sampling, remove the surface of the sampling site, and then extract roughly equal amounts of sand from different parts to form a group of samples.
2) When sampling from the belt conveyor, the feeder should be used to regularly extract 4 parts of sand in roughly the same amount at the discharge point of the tail of the belt conveyor to form a group of samples.
3) When sampling from trains, cars and cargo ships, roughly equal amounts of sand are extracted from different parts and depths to form a set of samples.
13: The main detection methods of the sand powder content are?
A: The stone powder content of the mechanism generally has two test methods: washing method and dry screening method, the representative is the United States ASTMC136 or AASHTOT27, suitable for dry screening, ASTMC117 or AASHTOT11, suitable for water sieve. However, China has always been in the cement concrete aggregate or asphalt pavement aggregate, are directly using the dry screening method, 0.075mm sieve passing amount is not determined by washing, so the accuracy is poor. The dry screening method is mainly applied to cement concrete aggregates, and the comprehensive evaluation should be combined with the detection results of methylene blue value.
14: What are the main process methods of stone powder separation?
A: From the industry process equipment development: at present, the main methods to remove excess stone powder in the original sand are water washing hydraulic classification, high-frequency screening mechanical screening and dust removal wind classification.
Fifteen: How to adjust the grading index of sand particles?
A: Mechanical sand particle grading can be achieved by adjusting the feed grading, feed amount, crusher speed, screen size and other aspects.
Sixteen: What factors affect the mechanism of sand grain shape?
A: The factors that affect the shape of the sand are:
1) The lithology of the source rock, such as the development of joints, is not conducive to obtaining better grain shape.
2) Type of crushing equipment, impact crusher forming effect is better.
3) The type of screen, such as square holes, has better control over particle shape.
17: Why "to break the generation of grinding, more broken less grinding"?
Answer: Because the energy utilization rate of crushing is higher than that of grinding, more breaking and less grinding is conducive to saving energy, but it can not be completely broken by grinding, because the energy utilization of both changes in reverse with the reduction of material particle size.
18: What are the characteristics of "stone beating stone" and "stone beating iron"?
A: "stone beating stone" is suitable for medium hard and above abrasive materials, such as basalt. Under the working condition of "stone beating stone", the finished product has better grain shape and slightly more powder content. "Stone iron" is suitable for medium and hard less abrasive materials, such as limestone and so on. Under the working condition of "stone beating", the crushing efficiency is high, the wear cost of the surrounding protection plate is high, and the finished grain shape is slightly poor. The most serious wear of "stone beating iron" should be the anvil, so its structural design and casting process are also important factors affecting the efficiency of the sand making machine. In addition, "stone beating stone" is suitable for plastic surgery, "stone beating iron" is suitable for sand making.
19: Why does the impact crusher (sand making machine) use double motors?
A: The use of dual motors has two main functions:
1) Dual motors ensure the balanced force of the spindle.
2) Ensure speed, energy will be lost in the transmission process, dual motor to ensure high power, to ensure speed.
Twenty: How to solve the large working current deviation between the two?
A: In dual-drive equipment, the current of one motor is lower than that of the other, which is called an inert reaction, and the deviation requirement should not be greater than 10%; Generally, it is solved by adjusting the tension of the transmission belt and making it equal, checking the cleanliness of the terminal, and checking the soft start problem.
21: Why should the impeller rotor be corrected for static balance?
Answer: The impeller rotor does not carry out proper static balance correction, the rotor unbalance is large, and the centrifugal force generated during operation will lead to abnormal vibration and failure of the equipment, abnormal wear of the rotor, excessive noise and other problems. According to industry standards, the impeller rotor balance class of the impact sand making machine is G16.
22: What are the basic steps for the balance of sand making machine?
A: After the impeller rotor of the impact sand making machine is replaced with wear-resistant parts, the basic steps for the static balance correction of the impeller rotor are:
1) Clean the sand, stone, old wear parts, debris on the rotor and accessories, and confirm that it can continue to use.
2) Reinstall the wear-resistant parts and install the rotor on the balance tooling.
3) Determine the weight and position of the imbalance.
4) Review the balanced rotor balance.
23: Factors affecting the efficiency of impact sand making machine?
A: 1) Characteristics of raw materials. The hardness and strength of the material are low, the crushing property is good, and the sand making efficiency is high.
2) Influence of water content of crushed materials. Higher water content reduces sand production.
3) The size of the feeding amount. Generally speaking, the greater the feed amount, the better the crushing effect, but there are extreme points.
4) Rotational speed of the impeller. Generally, the higher the speed, the better the crushing efficiency.
24: Why does the impact sand making machine vibrate more when it starts running?
Answer: Because the rotor does not form a uniform lining and imbalance caused by the start of operation, so generally at the beginning of the need to enter several pieces of fine material, if the start of the coarse material will continue to vibrate for several hours until the rotor formed a uniform lining.
25: What type of vibrating screen is currently used for mechanical sand and gravel screening?
A: The screening equipment mainly used for sand and stone production is: bar screen, cylinder screen, round vibrating screen, linear vibrating screen, high frequency screen and probability screen six types, of which bar screen is mainly used for soil removal process, circular vibrating screen, linear vibrating screen is more common.
26: What factors will cause screen holes to be blocked?
A: 1) Sand and gravel contain a large number of critical separation point sand and gravel particles.
2) sand and stone contains more flake materials; Due to the reasons of rock breakage or sand and stone itself, there are more flaky materials in sand and stone, and the flaky materials in screening themselves can not be sifted smoothly.
3) There is more mud in sand and stone.
4) High water content in sand and stone.
27: What is the main reason why the screen is easy to damage?
A: The main reason why the screen is easy to damage is:
1) Screen quality or material is not qualified.
2) The tensioning strength of the screen is not enough, which causes the screen to vibrate, usually broken or damaged along the edge of the screen or the wrapping strip.
3) The vibration amplitude of the screen is too small, resulting in the accumulation of sand particles on the screen and rapid damage to the screen.
28: What is the relationship between fineness modulus and screen size?
A: At present, the general requirement of the mechanical sand fineness modulus produced by the stone sand making machine is 2.6-3.0, and it is generally recommended to use a screen size of 3.0mm or 3.5mm. If the content of stone powder is more, you can consider using 2.8mm screen; If you reach about 2.3, you can consider a long screen, such as 1.7X5 or 1.9X5 screen size. The screen type is generally selected as square hole screen as possible, which is very beneficial to particle shape control; Use round mesh or long screen as little as possible; It is also necessary to often monitor whether the screen is damaged and affect the fineness modulus.
29: What are the wearing parts of the impact sand making machine?
A: Standard wearing parts are: cylindrical roller bearing, deep groove ball bearing, thrust ball bearing, expansion sleeve, conveyor belt, oil seal, O-ring seal.
Non-standard wearing parts include: upper shaft sleeve, lower shaft sleeve (hopper lifting part), shock absorber rubber, spinner retainer ring, upper/lower track plate, impact block, parting cone, wear plate, throw-off head, blanking ring, feed pipe, upper/lower striking plate, hopper liner ring, parting tray, bulk tray (bulk cone), perimeter guard plate.
30: Why is wheel sand washing machine generally used in wet production?
A: The wheel sand washing machine has a simple structure, the failure rate is much lower than that of the spiral sand washing machine, and in the washing process, the loss of fine particle sand and stone powder is less, the production of mechanical sand is better graded, the fineness modulus is easy to control, and the quality is more stable.
31: Mechanical sand apparent density loose bulk density and other requirements?
A: The apparent density of machine-made sand is not less than 2500kg/m3; Loose packing density is not less than 1400kg/m3; The porosity is not greater than 44%.
32: What are the types of natural rocks?
A: There are three types of natural rocks, which are:
The first type is magmatic rock (igneous rock), formed by the eruption of magma, generally hard, uniform texture.
The second category is sedimentary rock (diagenesis), which is formed by weathering, transport, sedimentation and diagenesis and a series of geological processes, which is generally characterized by a layered distribution structure, and similar in nature at the same time.
The third type is metamorphic rock, which is formed on the basis of existing rocks after metamorphic mixing, and its characteristics are both the above rocks and their own characteristics.
33: Which rocks can be used for mechanical sand production?

A: The raw materials for making sand are usually granite, basalt, river pebble, pebble, andesite, rhyolite, diabase, diorite, sandstone, limestone and other varieties. The machine-made sand is differentiated according to the type of rock, and there are differences in strength and use.
In summary: Shandong Sanxiang Heavy Industry Co., Ltd. as a crusher mill manufacturer in Shandong, focus on the crusher industry. Taking the hammer crusher as the starting point, the company has successfully developed complete sets of crushing mills machinery equipment such as hydraulic counterroll sand making machine, jaw crusher mills, impact crusher, counterroll crusher, force crusher for sale, reversible force crusher, vibrating feeder, circular vibrating screen, hydraulic cone crusher, wood crusher and so on. Accessories sales include high chromium alloy hammer, wear leakage plate and so on. Focusing on providing customers with production lines, the company has also developed sand making, screening, powder selection, transmission, dust prevention, steel structure and other auxiliary equipment.