Improvement of the coal mill discharge tube sealing mechanism

Coal mill discharge tube sealing device improvement - 2019 04 - 24 Fan Zhongchun 1 Liu Minghong 2 ( 1. Aksu tianshan surf cement co. , LTD. , xinjiang aksu 843000; 2. Hunan creek huazhong cement co. , LTD. , hunan Chen creek 419500). My company a & Phi; 2. 4 m× 4. 75 m wind swept coal grinding mill finish discharging pipe during leak is expected to use after a period of time, disassemble, discharging taper sleeve and discharge tube cylindrical wear large, discharge tube wear unevenly, the upper wear. After replace the sealing ring, quickly material leakage, and more serious. 1 discharging pipe leakage cause analysis 1) Grinding in high wind speed, bring up fine powder material or coarse particle material easy to enter the discharge between the taper sleeve and discharge tube, causing wear and seal damage, leakage of material. 2) Seal USES 4 block ( 30× 30) Half of mm circular thick felt lap, after the discharge tube wear, especially outside the uneven wear round round after, easy to spread out a gap joint leakage. 3) Due to grinding end bearing shell has certain wear and tear, mill hollow shaft position will move down; Accumulation of material and lower clearance, discharge tube and the taper sleeve wear, the wear is lower and upper small, so there will be a discharge taper sleeve and discharge tube on the gap between small under the big situation, which makes the material more easily from the below into the gap between the two, accelerated wear and tear. 4) In the operation of the mill, because of the wind in the sweep of grinding material relative to other less grinding, ball will directly target lining plate, noise big, liner wear easily, operators are often used to increase grinding operation, feeding rate of way in this way, in the grinding material level increases, beyond the lowest position of discharging taper sleeve, the material easy to enter the discharge in the clearance between the discharge pipe and taper sleeve, easy to cause leakage. 2 improvements mill sealing device of the improved structure as shown in figure 1. 1) In the welding of discharging taper sleeve inside a circle ring, avoid the material under the action of wind, directly into the discharge between taper sleeve and discharge tube. Retaining ring is 5 mm, and the material on the surface of the pipe end clearance height and discharge tube level, so that raw material is falling from the ascending air and debris ( Such as wood, etc. ) Can fall into the discharge grinding taper sleeve and return. 2) Longer discharge pipe and the discharging the matching of the taper sleeve length, to increase the leakage resistance. The with the original length of 20 mm ( Do not contain sealing ring in length) 。 Cooperate with shorter length, the material through the resistance is smaller. To this end, the discharge pipe corresponding extended 50 mm, make the cooperate to increase to 70 mm in length. 3) To improve discharge tube structure. The original design of discharge pipe for steel pipe size suits, the wall thickness 6 mm, inside outside wall thick 7. 5 mm, inside and outside the tube welding together, and then with the discharge elbow and its supporting feet welded into a whole, then turning outside the pipe, to ensure the discharge pipe and the discharging of the taper sleeve concentricity. At the scene, if the discharge tube still adopts the above structure, laborious. To this end, we made by the 20 mm steel plate discharging pipe, considering the discharging taper sleeve wear, from the discharge pipe diameter & Phi; Increases to 665 mm & Phi; 670 mm, and maintain the discharge pipe and the discharging the minimum clearance between taper sleeve is 5 mm. Discharge pipe rolled after turning machining cylindrical surface and two ends, to facilitate the discharge elbow welding and guarantee the concentricity and discharging taper sleeve. When installation, first determine the discharge tube axial position, which ensure the face 5 mm gap with the retaining ring end face, and then use the material on the taper sleeve 16 M12 & times; 70 mm good adjustment bolt to adjust radial location, and then the discharge pipe and the subsequent discharge elbow welding is good, to ensure the discharging concentricity between taper sleeve and discharge tube. For welding deformation, through to get rid of to install. The last leg of the welding and installing discharging pipe, and the supporting feet between flange and flange base padded around 3 mm gaskets, with convenient discharging tube downward adjustment. 4) Sealing ring to 28 mm & times; 28 mm oil-immersed asbestos packing, wire fasten joint, in order to avoid scattered joint failure. 5) Strengthen management, to avoid grinding. Once the leakage, to opening sealing device, cleaning the internal material, adjusting bolt, so as to reduce wear and tear. 3 slow tail effect these measures make coal leakage is greatly reduced, and a long time do not need to replace the gasket and the adjusting bolt. To this end, we at the end of another typhoon sweeps raw meal grinding mill did the improvement, also has obtained the ideal effect. Source: 'cement' 5, 2015