1. Construction of spiral classifier The motive part is mainly the output power of the motor; the transmission part includes a reducer, a cylindrical gear reduction device and a bevel gear reduction device, which accepts the part of the moving force, reduces the speed and increases the torsion to meet the requirements of the working department; the working part consists of a hollow shaft, up and down The support, the double spiral blade, the joint bracket and the trough body are formed, and the coarse ore deposited by the spiral conveying trough enters the return sand ditch, and the coarse ore deposited by the hydrodynamic flow conveying trough enters the return sand ditch, and relies on the hydraulic flow conveying trough The fine-grained ore in the sedimentation zone of the body flows through the overflow weir into the flotation process; the adjustment section includes a lifting screw, a transmission mechanism, etc., and adjusts the depth of the lower support in the tank to adjust the size of the sedimentation area. 2. The structure and use of the lower support are abnormal (1) Construction Analyze the lower bearing assembly drawing (see the figure below), which can be broken down into three components according to function: joint part, support part and sealing part. (2) Abnormal use of each part a, the joint group parts are abnormal, the double round nut 12 is loose, the flange 3 is worn, the keyway is worn, and the key 1 is worn. b. The bearing group parts are abnormal, the round nut 11 is retracted, the bearing bead frame is broken, and the beads are off track. In severe cases, the shaft diameter is worn from Φ180 to Φ80 and is separated from the bearing housing. The inner hole of the bearing body 6 is seriously worn, and the end surface of the bearing gland 8 is worn by the shaft. c. The parts of the sealing group are abnormal, the end face of the inner stuffing box 4 is worn through, the packing is completely worn and consumed, and the inside of the cavity is filled with slime. 3. Analysis of the causes of abnormal phenomena (1) Failure of the lower bearing bearing: When the classifier is in normal operation, a large axial force is caused due to the pressure of the returning sand on the blade. Moreover, due to the inclined installation, the self-weight is large, and a certain axial force is also generated. In addition, there is also the axial component force generated by the rotation of the bevel gear. These three axial forces are theoretically supported by the upper thrust ball bearing. In fact, with the wear of the upper bearing and the error in the assembly, the running axial force is more and more Large, causing the hollow shaft to move down, generating thrust on the lower support, making the bearing easy to overload and heat and jam. Moreover, due to the friction and heat generation of the filler, the heat is not easily dissipated, and the thermal expansion of the bearing is also caused to be stuck. (2) Flange inner hole wear: the mating surface roughness is low, the gap is too large, and the lower bearing rotation is not flexible, causing the transmission load of the mating surface to increase. (3) Failure of packing seal: The packing seal has large frictional resistance and serious wear. It can not be compensated after wear, and it is easy to enter the ore. The end face of the stuffing box is worn by the sand in the end face of the flange during the rotation of the dust disk, causing the end of the stuffing box. It wears out quickly and is easy to enter the sand. 4, the lower support improvement program (1) Improvement of the support group Under the premise of keeping the suspension form and the flange connection form unchanged and the external dimensions unchanged, the bearing is installed in the front section of the lower support, leaving the dead zone where the sand is stacked, immersed under the active liquid surface, and the heat dissipation condition is good. The tapered roller bearings 1 and 4 are selected, as shown in Fig. 2, to withstand large radial forces and withstand large axial forces. The bearing spacing is determined by force calculation. (2) Improvement of the sealing group The sealing adopts a multi-composite sealing method in which the composite skeleton oil seal 6 is mainly used and the thread seal is feared. The multi-head spiral is processed on the outer cylindrical surface of the rear sealing cover 5 to form a spiral seal with the cylindrical surface of the lifting lug 7. The screwing direction is consistent with the spiral axis of the spiral shaft, and when the rear sealing cover is rotated by the shaft 2 according to the prescribed working direction, The axial component generated by the spiral conveys the sand located in the gap between the rear sealing cover and the lifting lug, making the oil seal work more reliable. 5 sets of skeleton oil seals of two specifications are selected to form 5 sets of assembly units. The outer assembly dimensions of the assembly units are designed into 5 size segments, the assembly work is easy, and the assembly movement distances of the 5 assembly units are equal, forming 5 A group of independent sealed working units, any group of damage and failure can not affect the function of other groups, the sealing is more reliable. 5, improve the technical test results The improved lower support was put into trial, and the two sets of components tested have been running 9 multi-persons so far, in good condition, without any abnormality during the period. 6, the conclusion By improving the support of the lower support, the ability to withstand the axial force is changed, making the force more reasonable. In the bearing assembly, the lubricant is filled once to ensure reliable lubrication of the bearing. The spiral conveying principle is used to make the sealing more reliable, and the rotation resistance torque formed by the skeleton oil seal is small and the rotation is flexible. The improved lower support has a simple structure and long running time, which saves the cost of spare parts and improves the operating rate of the equipment. The spiral classifier is generally used in the beneficiation production line to form a closed circuit with the ball mill. Wood Display Fixtures,Wooden Display,Wooden Crafts,Makeup Display Rack Dongguan Golden Memory Display Products Co., Ltd. , https://www.dggmdisplays.com
Analyze the cause of the failure of the lower support of the spiral classifier
Today we will give you an analysis of the reasons for the failure of the lower support of the spiral classifier, and give you some analysis and improvement measures. As we all know, the spiral classifier forms a closed-circuit process with the ball mill in the beneficiation , but the classifier has long-term existence of the following prime minister: the lower bearing has a short service life and is calculated on an annual average of about 3 months. Frequent failure replacement increases the number of downtimes and time, reduces the operating rate of the energy-saving ball mill, increases the labor of the workers, and increases the cost of spare parts. In response to this problem, we conducted a comprehensive analysis of the reasons for the failure of the lower bearing, and proposed a comprehensive improvement program, which achieved good results after the initial implementation of the program.