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Technical improvement of anti-blocking jaw plate of tube mil

Date:2019-05-21 14:32     writer:admin     Views:

  1. Problems with casting rafts

  1.1 Quilting is easily blocked by the grinding body

  Current state of the art ball mill jaws typically employ conventional cast jaws, which present several problems. Due to the casting error and the draft angle, the quilting is generally 7-10mm, and the fine grinding bin often adopts the 8-10mm diameter steel segment. Once worn, it is inevitable to block the quilting, and the lighter reduces the flow velocity of the grinding material and affects the grinding output. Increase the internal wind resistance and increase the energy consumption of grinding; the heavy ones stop grinding and maintenance, generally grinding for about one month, you need to stop grinding and clean up the blockage, manually clean the quilting, each time to stop the grinding time 3-4 classes, directly affective the grinding operation rate, thus affecting the energy consumption of grinding body located in the outer layer can not produce the projectile motion, so that the energy consumption of the mill increases.

  1.2 Low hardness and short life

  People have not been able to get rid of the high-power consumption of the tube mill, high metal (steel ball, liner, partition board, etc.) consumption. The cast liner is thicker and the traditional design has a thickness of 50mm. Although it is changed to cast alloy and hardened by heat treatment, the hardness can only reach HRC 40. Take 3.8*13m mill as an example: the total weight of the discharge raft is 4t, and the average service life is 14500h. Due to the low hardness of the material of the mill compartment, most of the is extended and closed under the impact of the steel ball, and the ventilation and the material are completely lost. This is the phenomenon of cement over-grinding.

  1.3 Low through hole rate

  In the casting and strength conditions, the traditional design of the slab through hole rate of 9%, a partial blockage, the flow is directly blocked, the speed is lower, the fine powder cannot get out, forming a mat, reducing the grinding output, increasing the grinding energy consumption.

  2. Technical improvement of anti-blocking jaw

  2.1 Improvement purpose and design ideas

  It is the design goal to fundamentally solve the problems existing in the current mill casting slab, improve the strength, wear resistance, through hole rate and operation rate, and reduce the grinding power consumption, manufacturing cost and running cost.

  Taking the energy saving and consumption reduction of products as the general rule, the main mechanism of the ball mill boring plate in the grinding process is studied, and the technical requirements of the modern energy-saving grinding on the boring plate of the mill are analyzed, and various improvement schemes are proposed for the problems of the current mill raft. In combination with each solution, it is preferred to have the best energy-saving benefits and a combination of lower manufacturing costs and operating costs.

  2.2 Improvements

  1) With the goal of light weighting and high-strength mechanical properties, it is studies to optimize the wear resistance, machinability and weldability of various sieve materials, and it is preferred to use a slab that is nearly 50% smaller than the original thickness. Develop a machinable weldable heat-treatable alloy steel slab to replace the current ball mill casting slab, accurately control the quilting accuracy+/= 0.2mm, and basically avoid steel blockage.

  The mill jaw is a wear part, and the wear resistance of the wear parts is the main goal of the research and development. The usual methods re: 1. Adding wear-resistance alloy elements; 2. Surface treatment to improve wear resistance; 3 heat treatment hardening. This design is preferred to a chromium-manganese alloy with better hardenability. Considering the carbon equivalent with good weldability, a new type of wear-resistant steel is studies based on medium carbon low alloy steel: designing test steel of different chemical compositions. The kinds of test steels were analyzed for the metallographic structure and mechanical properties of the test steel after rolling by changing the content of Mn, Cr and Mo. The hardness of the test steel was selected from test steels. The material with the best impact toughness is subjected to subsequent heat treatment tests. They are heated at 850-950 centigrade, quenched for 0.5-2h, then tempered at 300-600 centigrade. After heat treatment, the impact properties and hardness values of the test steel are measured. The wear tester is used to determine the wear resistance of the test steel. Scanning electron microscopy and metallographic microscope were used to observe the impact fracture morphology, wear morphology and metallographic structure of the test steel. Determine the most reasonable heat treatment by comparing various performance indexes under different heat treatment processes.

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