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Archyvas: Spalis, 2019

Physical phenomena during the working of the ball mill


From the physical phenomena and geometrical characteristics of ore crushing and ball mill grinding process, grinding is the continuation of crushing ore, which is a process of reducing the size of a nugget or ore. However, from the thermodynamic point of view, grinding is a process of internal energy increase. The grinding machine works on the ore block and overcomes the cohesion of the ore block to break it. Therefore, grinding is a process of mutual transformation. The electric energy input by the power grid is converted into mechanical energy by the electric motor, and the mechanical energy works on the grinding machine and the medium through the transmission system, and becomes the mechanical energy of the grinding medium of the ball mill. When the grinding medium falls or rolls down, it works on the ore. The work of the medium becomes the deformation internal energy of the ore, which causes the ore to deform and break. After the ore is broken, it becomes the new surface energy of the ore.
The work of deforming and breaking ore is active, and it includes deformation work and separation work. Most of the work done by the medium on the ore is lost to the surrounding medium space during the crushing process. This part is called the fracture loss force. It includes the ore and the mechanical parts and the friction work between the ore and the ore. The crushing force repeatedly acts as a loss of heat energy loss, loss of sound energy, light energy and radiant energy. A certain energy loss occurs every time an energy conversion occurs. SBM Machinery is mainly engaged in the production and sales of ball mill series equipment, steel slag ball mill, round hammer ball mill, beneficiation ball mill, lattice ball mill and other different ball mill types, can provide you with the ball mill model for your satisfaction.

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The development of jaw crusher technology is constantly seeking innovation and reform


At present, the most widely used jaw crusher produced in China has two forms: the jaw crusher with a simple swinging crank and a double rocker mechanism. Simple pendulum jaw crusher; Jaw crusher with complex swinging crank and rocker mechanism. The former is mostly made into large or medium, and its crushing ratio is 3— 3; The latter is generally made of small and medium-sized, its crushing ratio up to 10. With the development of industrial technology, compound pendulum jaw crusher has been to the development of large-scale, has been adapted to the development needs of various industries.
Crusher has been mining, smelting, building materials, highway, railway, water conservancy and chemical industry and other industries, especially the jaw crusher is the pearl of each industry.
But with the development of the society is not broken, the technology of the crusher is constantly innovative, the type is also broken, such as: impact crusher, cone crusher, hammer crusher, impact crusher, on the roll broken. Therefore, the position of hubei jaw crusher is obviously reduced.
The scale of social demand for all kinds of metal, non-metal ore and other materials is expanding day by day. Since the 1990s, the annual amount of worn out materials in the world has reached more than 10 billion tons. China’s annual production of brittle materials has reached about 1.5 billion tons, most of these materials have to go through the grinding, crushing and grinding engineering in the national economy plays a huge role.
Therefore, under the stimulation of various factors, our company has continuously improved and innovated the technology of hubei crusher: optimize the structure and movement track: improve the crushing cavity, in order to increase the crushing ratio, improve the crushing efficiency, reduce wear and tear, reduce energy consumption, has been widely used in high crushing cavity and small Angle; Improve the suspension of the jaw and the support of the lining plate, improve the performance of the crusher. Improve the level of automation (automatic regulation, overload protection, automatic lubrication, etc.).

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Influencing factors and precautions of precision casting dimensional accuracy defects


Under normal circumstances, the dimensional accuracy of precision casting is affected by many factors such as the structure of the casting, the material of the casting, the molding, the shell, the roasting, and the casting. Any setting or unreasonable operation will change the shrinkage of the casting. The dimensional accuracy of the casting is deviated from the requirements. The following are factors that can cause defects in the precision of precision castings:
(1) Influence of casting structure: a. The wall thickness of the casting is large, the shrinkage rate is large, the casting wall is thin, and the shrinkage rate is small. b. The free shrinkage rate is large, which hinders the shrinkage rate.
(2) Influence of casting material: a. The higher the carbon content in the material, the smaller the linear shrinkage rate, and the lower the carbon content, the larger the linear shrinkage rate. b. The casting shrinkage of common materials is as follows: casting shrinkage K = (LM-LJ) / LJ × 100%, LM is the cavity size, and LJ is the casting size. K is affected by the following factors: wax mold K1, casting structure K2, alloy type K3, casting temperature K4.
(3) The influence of mold making on the shrinkage rate of castings: a. The effect of wax temperature, wax pressure and dwell time on the size of the investment is obvious. The temperature of the wax is obvious, followed by the pressure of the wax, and the pressure holding time is guaranteed. After the investment molding, the influence on the final size of the investment mold is small. b. The linear shrinkage of the wax (molding) material is about 0.9-1.1%. c. When the investment mold is stored, further shrinkage will occur, and the shrinkage value is about 10% of the total shrinkage amount, but after 12 hours of storage, the investment size is substantially stable. d. The radial shrinkage of the wax mold is only 30-40% of the shrinkage in the longitudinal direction, and the effect of the wax temperature on the free shrinkage is far greater than the effect on the resistive shrinkage (the preferred wax temperature is 57-59 ° C, The higher the temperature, the greater the shrinkage).
(4) Influence of shell material: Zircon sand, zircon powder, Shangdian sand, Shangdian powder, because of its small expansion coefficient, is only 4.6×10-6/°C, so it can be ignored.
(5) Effect of shell roasting: Since the coefficient of expansion of the shell is small, when the shell temperature is 1150 ° C, it is only 0.053%, so it can be neglected.
(6) Effect of casting temperature: The higher the pouring temperature, the larger the shrinkage rate, the lower the casting temperature and the smaller the shrinkage rate, so the pouring temperature should be appropriate.

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The advantages and functions of precision casting


Precision casting is a casting method in the modern traditional casting process. It can obtain relatively accurate shapes and high casting precision. When designing and manufacturing products, it should be carried out by a relatively good casting method. The metal material obtained by casting a wax after a series of castings can obtain a relatively high-precision finished product after sand cleaning, and can be heat-treated or cold-worked according to the needs of the product.
So what are the main advantages of the silica sol precision casting products produced in this way? The use range of precision casting is relatively wide, the production mode is convenient, and a large amount of scrap metal and renewable resources can be used, and the consumption is less. The cost is relatively low and the overall economic performance is good.
When casting high dimensional accuracy and high surface finish, the products produced in this way can reduce the amount of machining work, save a lot of machine tools and processing time when processing, and can Greatly save metal raw materials.

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How the blade can hinder the productivity of Raymond Mill


In the production process of Raymond Mill, the hardness, water content and impurities contained in the processed materials play an important role in the equipment. At the same time, Raymond’s blade will also affect the production capacity of the equipment. Today, Shanghai Shanzhuo Heavy Industry introduces how the blade can hinder the productivity of Raymond Mill.
First, we should all know that in the production of Raymond mill, the blade mainly scrapes the material and sends it to the grinding roller and the grinding ring for grinding. The lifting position of the blade is too high, and some are biased. Low, so that the material scooped by the blade can not be accurately sent to the grinding position, which greatly affects the production capacity of Raymond Mill.
Second, the size of the blade has a direct relationship with the production space of Raymond Mill. If the space is too large, it will not be put in, and it will affect the normal operation of Raymond Mill. If it is too small, then Shovel can not handle the material being processed. Therefore, when purchasing, you must pay attention to the size of the Raymond sharpening blade.
Third, the production efficiency of Raymond Mill will become an important part of saving resources and energy. Therefore, when purchasing the Raymond Scrub, the blade can be reasonably configured according to the nature of the material and the model of the equipment. The hardness is relatively high and the use time is relatively short.

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The main reason for the production of pores in stainless steel castings


In the stainless steel casting process, the pore problem often occurs, which causes a lot of troubles for the stainless steel casting processing. The pore is the bubble defect formed by the deposited gas remaining in the ingot during the cooling and solidification of the metal liquid. Let’s analyze the main reasons for the generation of pores:
01. The permeability of the coating is poor or the negative pressure is insufficient. The gas permeability of the filling sand is poor, and the gas and residue in the cavity cannot be discharged in time, and the pores are formed under the filling pressure.
02. The pouring speed is too slow to fill the sprue cup, expose the sprue, entrap the air, inhale the slag, and form the venting hole and the slag hole.
03. Foam model gasification decomposition generates a large amount of gas and residue can not be discharged into the mold in time, foam, paint layer filled dry sand is poor drying, surrounded by high temperature of liquid alloy, cracking a large amount of hydrogen and oxygen into the casting is formed The main cause of stomata.
04. Due to the unreasonable design of the pouring system, the filling speed of the molten metal is greater than the foaming gasification and gas discharge speed, causing the filling front to enclose the gasification residue in the metal liquid and vaporize again to form the decomposition black hole of the inner wall smoke black. .
05. The connection between the sprue cup and the sprue and the pouring system is not well sealed, especially the connection between the sprue and the sprue cup is not good, and the sand and the air hole are easily formed under the action of the negative pressure. This phenomenon can be calculated and explained by the Bernoulli equation.
06. The particle size of the molding sand is too fine, the dust content is high, the gas permeability is poor, and the internal pressure of the negative pressure pipe causes the negative pressure distortion, so that the negative pressure value around the cavity is far lower than the indicated negative pressure, and the vapor can not discharge the coating in time. Forming pores or wrinkles.
07. The pouring temperature is low, the filling front metal liquid can not fully vaporize the foam, and the undecomposed residual material can not be floated to the riser to solidify and form pores in the casting.
08. Poor deoxidation of molten steel, uncleaning of slag in the furnace, furnace and package, the sedation time is too short, the slag blocking is not strong during the pouring process, and the pouring process is unreasonable to cause slag holes.
09. The position of the sprue is unreasonable. When filling, the dead zone is formed. Due to the gas pressure in the cavity, the gasification residue accumulates at the dead corner to form pores. The cross-sectional area of ​​the gate is too large, so that the filling speed is greater than The foam gasification rate is reduced, the foam is swallowed, and the gas is decomposed and vaporized inside the alloy, and the gas cannot be discharged to form pores.
10. The capacity of the gate cup is too small, and the molten metal forms a vortex, which invades the air to form pores.

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Stainless steel precision casting process


There are two main types of dewaxing casting methods: the Solid Mold method and the Ceramic Shell Mold method, the latter being the former method of improvement.
The shell mold method until the wax type is produced in the same way as the solid mold, but after one damp and sand (or floating sand), the mold-free operation is not carried out, but the dipping and sanding are repeated several times. Until the predetermined shell thickness is obtained. Drying, heating, melting and waxing, high temperature heating and casting, this method is widely used by the current dewaxing precision casting industry, because it has the following advantages:
(1) The process can be partially automated to save manpower and increase production rate
(2) Lower production costs
(3) The ceramic shell mold is thin, and the casting rate of the casting after casting is high and uniform, so the mechanical properties are better.
(4) better dimensional stability
A precision casting mold for stainless steel precision casting obtains a casting method for precision castings.

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How to improve the efficiency of vertical roller mill grinding machine


The configuration of SBM heavy machine vertical roller mill grinding machine must be based on design output, based on the principle of process rationality and advanced nature. Based on comparison and analysis of different configuration schemes, it can be optimized to achieve ideal milling. Process effect. SBM heavy machine mining equipment analyzes and compares the vertical grinding mill model, vertical roller mill grinding machine output and grinding fineness in each process, combined with the user’s use of vertical roller mill grinding machine equipment, for vertical roller mill grinding Machine model configuration problem and how to configure the vertical roller mill grinding machine and improve the process effect analysis, the innovative idea of ​​the vertical roller mill grinding machine configuration in the industrial milling process, the customer demand as the research focus, efforts in equipment research, product technology, etc. Strive for level. SBM heavy machine pays attention to product quality, relies on technological innovation, optimizes product structure, enhances core competitiveness, continuously expands business fields, and always adheres to people-oriented, technological innovation, emphasizes internal quality and external image, and constantly improves internal management mechanism and improves Product quality, quality products and after-sales service continue to meet the needs of our customers.
In the design of large-scale industrial milling technology, when the production scale and product structure are basically determined, how to properly configure the vertical grinding mill will directly affect the design, process effect and economic benefits of the milling system. Over the years, the mining machinery manufacturer SBM heavy machine mining equipment has been continuously innovating, surpassing itself, challenging the limit, striving to provide customers with quality products and services, pursuing the integrity, pragmatic and efficient operation, always insisting on building brand with quality and improving service. Brand, we warmly welcome friends to visit, exchange and negotiate cooperation.
The output of the vertical roller mill is an important indicator with a goal in the design of the milling process. It is related to the selection of the model and quantity of the vertical roller mill and the size of the investment. The vertical grinding mill is the core equipment in the milling process, and its grinding effect is related to economic and technical indicators such as flour extraction rate and yield quality. Most of the milling process now selects the type and quantity of the vertical roller mill based on the output, and then distributes it to each of the milling processes. Reasonably determine the type and quantity of the vertical grinding mill to make the industrial milling process design more reasonable and complete. The more the vertical roller mill and the thinner the system, the more flexible the system adjustment and the more complete the process. The combination of different types of vertical roller mills saves investment and reduces operating costs. In order to meet the process requirements, you can reduce the investment by matching different types of vertical roller mills.

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How to reduce the number of Raymond mill maintenance


It usually takes a certain amount of time to repair the equipment, which will cause the equipment to stop and the production efficiency will affect the production. In order to save production time, the number of repairing Raymond mill is minimized, the production output is guaranteed, and the development of production is promoted smoothly.
In daily operations, we need to check the equipment to a certain extent on a regular basis to see if the equipment is fault-free and to properly handle it. In the whole production, the maintenance of equipment is the key to ensure the normal operation of the equipment. The number of inspections will affect the production of the whole machine. In the future, the number of maintenance of equipment will be reduced, and the performance of the equipment will be improved through reasonable daily inspection and maintenance.
First of all, we need production personnel, always pay attention to the working state of the equipment in production, observe the operation of each component including dust removal equipment, motor, etc., and observe the working state of attention through the particle size and quantity of milling, pay attention to all aspects of production and discover in time. Abnormalities and safe and reliable processing. This is the key to ensuring a large abnormal condition in the equipment.
Secondly, do the maintenance work before and after production, check the integrity of the equipment, and conduct a more detailed inspection of the parts that are easy to wear. Check the condition of wearing parts such as the Raymond mill roller ring. Replace parts with severe wear and replace them in a timely manner, and pay attention to effective lubrication of the equipment. After the shutdown, do a good job of cleaning the whole machine, including the motor, dust collector and other places that are prone to dust or blockage, to ensure that the equipment is clean and tidy, and to clean the entire production area.
In the daily inspection, the technicians who need to arrange the transfer should carry out regular inspections on the equipment, and do the maintenance of the equipment in advance, pay attention to the replacement of the oil. The production area is cleaned. In this way, the Raymond powder equipment can be maintained from daily production, which can reduce the number of inspections of equipment in production and ensure production efficiency.

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What is the most important thing in producing a sand making machine?


With the development of the times, there are many manufacturers of sand making machine in China, but it does not mean that the sand making machines produced by each manufacturer are the same, so customers need to carefully select the sand making machine manufacturers when purchasing sand making machines. . What is the most important thing in the production of sand making machines? The following SBM Xiaobian explained:
First of all, we want the sand making machine to produce stable efficiency and hard steel. This is directly related to the production of the sand making machine manufacturer, no matter what equipment or things we use in life, if the manufacturer does not pay attention to quality during production. If it is fine, then the things produced will be of high quality or easily damaged. Everyone knows that now is an era of rapid development of infrastructure. The sand making machine is the equipment for solving the raw materials used in construction. A good sand making machine can bring great profit to the users, and a bad quality sand making machine. The machine brings us the loss of benefits and the waste of artificial resources.
The raw material is the most important when producing the sand making machine. The quality of the sand making machine is not only related to the experience of the production personnel, but more importantly the quality of the raw materials. The sand making machine produced by Shanghai SBM adopts Shanghai Baosteel high-quality steel plate and is equipped with high wear resistance. Accessories to reduce the replacement rate of consumables. Many customers who purchase sand making machine often consider adopting cheaper manufacturers, but they don’t know the tricks behind them. Generally speaking, the price and quality are proportional, but it is also necessary to check whether the manufacturer is honest and has good equipment quality. Manufacturer. There are many manufacturers that attract customers to achieve a deal at an ultra-low price in order to earn profits. The equipment that is made is either of a very low quality or the equipment is charged at the time of delivery, so that it cannot be blinded by the price. .
SBM Heavy Industry is a professional manufacturer of sand making machines in Shanghai. It has always been based on equipment quality and corporate integrity in this industry. The sand making machines produced by SBM are sold at reasonable prices. There will be no indiscriminate charging. When the contract is signed, all the requirements of the customer will be included in the contract, and the contractual system will be followed, so that customers can purchase with confidence.

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