Application of hydraulic retaining wheel in large rotary kiln
With the advanced technology and equipment level of the 1990s, the Sulphuric Acid Engineering of the Smelting Plant has been continuously improved and improved. At present, all the production process indicators have reached an ideal state, and the production of the sulfuric acid system has reached and exceeded the design capacity. The successful improvement of the acid-making equipment of the plant and the smelting industry has accumulated experience for the promotion of new equipment, new technologies and new materials for the production of acid from the colored flue gas in China, and is of great significance for improving the equipment level of China's non-ferrous sulphuric acid equipment. Application of hydraulic retaining wheel in large rotary kiln Song Wenbao (Zhuzhou Smelting Plant Roasting Branch, Zhuzhou 412004, Hunan) The hydraulic retaining wheel is widely used in large-scale kiln. This paper describes the application of hydraulic retaining wheel. Principle, normal operating conditions, common faults in use, qualitative analysis of the unstable factors of the hydraulic retaining wheel in operation, reasonable improvement methods are proposed, and the life of the rotary kiln is extended. China Classification No. 丨TF806. Rotary kiln is the main equipment in our zinc oxide system. It is used to treat and recover leaching slag containing 22% zinc. The system is small and has great benefits. It is called “cash treeâ€. In 1968 and 1972, three factories were installed in our factory. In recent years, due to the continuous excavation and renovation of the production potential of the system, our factory added a set of Y3. 52m rotary kiln system in May 1993. In February 1997, we added a new set of 4.15mmX 52.8mm. In the rotary kiln system, in March 1996 and November 1997, two kiln in the original three Y2.4mX44m rotary kiln were overhauled and converted into a Y2.44m rotary kiln. Before the renovation, the form and function of the retaining wheel in the three rotary kiln are signal retaining wheels. The upper and lower turbulent strokes of the rotary kiln are adjusted by the manual kiln method. This method relies on the operator's observation. And experience, so there are often accidents that cause forced kiln shutdown. This kind of kiln operation also caused the non-parallel between the support wheel and the axis of the kiln, which resulted in uneven contact between the retaining wheel and the support ring. The operating conditions of the kiln were complicated, and the production capacity could not be fully exerted to restrict the economy. The growth of benefits. Therefore, in cooperation with Zhuzhou Smelter and North China University of Technology, the development and research of a new type of rotary kiln with computer integrated display and flexible transmission system in the “Eighth Five-Year†National Key Science and Technology Development Project (No. 85-09-01) In the project, the successful development and application of the automatic push-back hydraulic wheel system, and the results in the production process have been further summarized, improved, and applied to the modified rotary kiln, the structure is to support the wheel and support The axis of the circle is installed in parallel. When the kiln body slides down to a certain position, the kiln body is pushed back and reset by an automatic joint liquid locking system, thereby overcoming the drawbacks caused by the manual adjustment of the kiln, and having stable, reliable operation. Simple, convenient and so on. 1 Working principle The hydraulic retaining wheel is composed of a hydraulic oil station system and a retaining wheel device. The rotary kiln of Y3.45mX52m is taken as an example to explain the working principle: 1.1 Technical performance parameters Technical performance parameters are shown in Table 1. Table 1 technical performance parameters retaining wheel specifications, mm cylinder inner diameter, mm maximum stroke, mm system working pressure, MPa system maximum working pressure MPa maximum thrust, MN 1.2 working principle is now used to explain the working principle of the hydraulic retaining wheel. The rotary kiln moves down under the action of its own weight, moves down to a certain distance and hits the lower stroke switch, so that the hydraulic pump station motor starts, and at the same time closes the solenoid valve (so that the solenoid valve is de-energized), the motor drives the oil pump to work, and the pressure oil passes through the single The valve, the speed regulating valve, the throttle stop valve and the pressure oil pipe enter the oil cylinder, the piston in the oil cylinder is driven, and the retaining wheel is pushed to move the kiln body upward. After moving the Almm, the block on the kiln body hits the travel switch to send a signal signal. The electromagnetic reversing valve is energized to be connected to the oil circuit, and the motor stops rotating. The kiln body is moved downward by its own weight, and the piston in the retaining wheel and the oil cylinder is moved together. The oil in the oil cylinder is returned through the oil return pipe and electromagnetic exchange. The valve and the speed control valve are returned to the fuel tank, and the down speed is controlled by the regulating valve until the kiln body moves down to the collision lower stroke switch. At this time, the operation cycle of pushing the upper and lower kiln body is completed. After the collision of the lower stroke switch, a telecommunication signal is generated to start the motor, the electromagnetic reversing valve is closed, and the retaining wheel pushes the kiln body upward. In the event of a power outage or failure of the pumping station, a manual pump (with a quick coupling at the cylinder or on the pump block manifold) can be used. Rotary kiln hydraulic wheel working principle 1 quick joint 2. cylinder 3. shut-off valve 4 check valve 5 speed control valve 6. electromagnetic reversing valve 7. precision oil filter 8. overflow valve 9. oil pump 10. fuel tank 11 Pressure gauge switch 12. The oil filter kiln body is moved up and down by the hydraulic retaining wheel to ensure the uniform wear of the tread surface, and to provide guarantee for the future maintenance and installation of the supporting wheel. 2 The conditions of stable operation of the hydraulic retaining wheel The oil pressure retaining wheel is an important component in the rotary kiln. The back pressure value of the hydraulic oil that controls the upper and lower kiln body directly reflects the dynamic condition of the rotating kiln. If the back pressure is large, there will be serious consequences of being forced to stop the kiln due to damage to the components such as the wear of the wheel of the wheel. At the same time, due to the long-term abnormal operation, the roller tread will be worn and the local force will be too large. The adjustment of the force condition is difficult, which seriously affects the service life of the supporting wheel and the rotary kiln. For this reason, the normal stability of the hydraulic gear must ensure the following conditions: the hydraulic station system must supply oil normally. Under abnormal conditions, the strength of the hydraulic wheel must be able to bear the role of the signal retaining wheel. The upper and lower sway strokes AL of the hydraulic wheel must be controlled by an appropriate amount. According to the actual experience of the site, it is determined by the following factors: After the carcass is heated to the working condition, the AL must ensure that the upper and lower displacement of the support ring is greater than the non-contact amount of the tread surface and the support ring due to the elongation of the cylinder. AL must be less than the yaw amount of the universal joint safety angle. AL must be less than the amount of axial displacement of the large gear on the suspension pinion. AL must be less than the safe running yaw of the angle hinge of the torsion bar in the suspension gearbox. When the retaining wheel is installed, the center line and the axial line of the kiln must be bound in the direction of the bracket to ensure a certain amount of eccentricity AA (for example). Because there is friction between the retaining wheel and the support ring during operation, the direction of the frictional force will be inclined upward in the direction of the engagement without pre-setting the eccentric amount, so that the retaining wheel is "headed up". If the AA is too large, it will make the force of the downward force of the friction force too large, and the phenomenon that the wheel is "planted" occurs. According to the experience AA, it is taken as 5~8mm. 3 Common fault conditions and improvement methods The hydraulic wheel system is used in 4 large rotary kiln of our factory. In recent years, due to continuous improvement, the failure rate has been decreasing, but due to the structure, etc. There are still some reasons for this. The following is an example from May to December 1998. The fault conditions in use are shown in Table 2. Table 2 Fault situation name Date block fault condition Fault cause handling situation 1 Kiln June 14 bearing bad force, excessive lubrication, "planting phenomenon" Replace the bearing, adjust the kiln on September 9th, the base of the wheel is torn and the force is too large, "head up phenomenon" Wheel cleaning, wheel thickness turning 10mm 2 kiln July 8 bearing damage is too strong, "planting phenomenon" Replace the bearing, adjust the kiln on September 5, the bearing is too weak, "heading phenomenon" Replace the bearing, adjust the kiln on December 29, the bearing abnormal sound lubrication is not good, clean, refueling 4 kiln May 10 bearing damage is too strong, "head up phenomenon" Replace the bearing, adjust the name of the kiln name, the date of the wheel, the fault, the cause of the problem, the handling situation, June 29, the bearing is broken, the wheel and shaft wear excessive force, "planting phenomenon" Replace the bearing, the rest of the repair, adjust the kiln 5 kiln November 13th, the abnormal vibration of the wheel is too strong, poor lubrication, oil change, kiln è… ) Bearing 1 bearing 2 W bearing 2 bearing 3 a rotary kiln hydraulic gear wheel initial design structure b. Design structure of the rotary kiln hydraulic gear wheel after transformation. It can be seen from Table 2 that the direct cause of the damage of the hydraulic retaining wheel is caused by excessive force. The analysis of the Y.45mX52m rotary kiln is still described here: The initial design structure of the rotary kiln hydraulic wheel is composed of a double row cylindrical roller self-aligning bearing and another self-aligning thrust bearing (a). In this structure, the bearing 1 and the bearing 2 F are both adjustable. In theory, the center of rotation of the two bearings cannot be concentric in the vertical direction, and the self-locking is formed by a certain distance ΔA to withstand the combined force F of all external forces, so that It is in a stable state. The influence of many external factors is extremely variable, such as: the amount of material in the kiln, the ball formed by the mixture (commonly known as "knot"), the impact on the local parts, and the force of the single roller after the change of the center line of the roller The change, the frictional force of the contact surface between the retaining wheel and the support ring, etc., when the kiln body rotates, its direction and size constantly change, so that its self-locking force is not enough to withstand the external force, so that the vertical axis of the retaining wheel occurs. The yaw also causes our common "head-up" or "planting" phenomenon, which causes the single bearing to be overstressed and damaged. The above is only a qualitative analysis. In response to this phenomenon, we carried out the transformation on the original structure of the hydraulic retaining wheel in December 1994 (b). The addition of a radial bearing under the original thrust bearing to increase the strong vertical axis and increase the constraint on the vertical axis effectively controls the "head-up" and "planting" of the retaining wheel and prolongs the use of the bearing. Life, but the improvement of this method also brings drawbacks. On the one hand, the assembly is difficult; on the other hand, if F is further increased by the change of the working condition, the structure is still unstable, and a single bearing damage failure occurs, that is, the situation shown in Table 2. The direct response of this phenomenon is that when the back pressure of the retaining wheel is large, it is necessary to obtain the ideal operating condition of the hydraulic retaining wheel. Further, two problems must be solved: on the one hand, the structural dimension of the vertical axis of the retaining wheel should be as compact as possible. In order to eliminate the instability in its operation, it is conceivable that a double row cylindrical roller bearing is provided on the wheel with a flat bearing on the base; on the other hand, the action point of the hydraulic thrust and the effect of the kiln body on the retaining wheel The point forms a pair of couples, which strongly affects the stability of the retaining wheel. The force arm should be minimized to increase the stability of the retaining wheel during operation. 4 Conclusion The operation of the hydraulic retaining wheel system in large rotary kiln, in addition to the reasons introduced and analyzed in this paper, depends on the operating level of the unit of use, if the external factors are minimized and the rotary kiln is adjusted in time. The running condition of the machine will greatly reduce the failure rate of the hydraulic retaining wheel and improve the life of the rotary kiln in stable operation. Talking about the Function of Equipment Technical Regulations in Enterprise Management Zhao Jinghan, Zhu Yaping (Zhuzhou Smelting Plant, Mobility Department, Zhuzhou 412004, Hunan), briefly described the status of equipment technical regulations in the enterprise standardization system, and briefly reviewed the development and development of equipment technical regulations of our factory. Overview and role in production and operation. An important means of consuming and increasing benefits. The enterprise standardization system consists of four sub-systems: comprehensive basic standards, technical standards, management standards and working standards. Technical standards are an important part of the enterprise standardization system, and the main body is the technical basis for the organization of production, technology and production management. And equipment technical standard technical regulations; standardization system; equipment management 1 equipment technical regulations in the enterprise standardization system status enterprise standardization work is an important component and foundation of the national standardization work, it is enterprise organization modernization, standardized production, realize enterprise scientific management Improve product quality and reduce
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