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6=SimSun twin-screw extrusion granulation, 1 main reducer design Huo Fugui Wang Hao Li Changlin Shenyang Blower Group Co., Ltd. Jinguibin Panjin Ethylene Co., Ltd. performance and structural parameters, pointed out the key and innovation points of the technology, and analyzed Economic benefits.
1 Introduction The main function of the mixing granulator is to heat-plasticize the polymer powder, mix and shear, knead and homogenize the mixing process, and finally extrude the pellets to obtain convenient packaging, transportation and storage and corresponding finished pellets.
The large-scale mixing and squeezing granulator has a complicated structure and is difficult to design and manufacture. Only a few companies in Japan, France, France and Italy can design and manufacture.
At present, China's large-scale mixing granulators are completely dependent on imports, which are expensive and have a short life span. Due to the large domestic demand, it is costly every year. Therefore, the large-scale mixing and extrusion granulator of 70,000 polyethylene polypropylene was designated as the national major equipment localization project by the Sinopec Group Major Equipment Localization Office.
The main reducer of the large-scale mixing and squeezing granulator is a multi-function reducer with functions such as the unit, and the mechanism is complicated and the cost is also expensive.
2 Main technical parameters of large twin-screw extrusion granulator Double screw extruder granulator main reducer Main technical parameters No. Transmission mode Name Unit reducer Transmission torque distribution transmission 1 stage transmission 2 stage transmission screw 1 Screw 2 high speed rotation output Power evaluation output speed, low speed transmission power 4 1 moving ratio input speed Ding use coefficient double screw center distance mm gear center moment mm screw output torque core claw bearing life cylinder outer cylinder Hunchun design calculation 3 main reducer drive system main Reducer shape 1; main reducer drive and profile 2.
4 Design calculation content and technical key 4.1 Design and calculation content 4.1.1 Since the main reducer has 4 pairs of gear meshing, multi-stage reduction transmission, the distribution of transmission ratio is the key to drive optimization. The effective constraint that dominates the optimization of the transmission ratio design calculation is the contact strength condition. When the allowable contact stresses of the various levels are the same, and the influence of the variation of the load factor is not considered, the various transmission schemes are optimally minimized. The gear ratio is assigned. Therefore, the design structure of the main reducer is complicated and the calculation is difficult. The first thing to do is to optimize the gear ratio, and then use the contact strength as a constraint to calculate the optimal gear ratio distribution with the smallest transmission volume. In the process of optimizing the gear ratio configuration, if any calculation in the middle is passed, it must be calculated from the beginning and repeated until the constraints of the optimized design are met.
4.1.2 Design and calculation of the main reducer The main reducer is mainly arranged in Panjin Ethylene, and then the main reducer is designed and manufactured for Panjin Ethylene Industry Co., Ltd. The main reducer weighs about 1 and has a bearing test point vibration test point and an exhaust hood.
4.1.3 Function analysis of the main reducer drive system Main reducer features 4 pairs of gears Multiple radial rolling bearings Two multi-stage series thrust bearings The first gear drive shaft is equipped with a fork gear reversing mechanism for achieving twin screw High-speed or low-speed selection of two output shafts, the root is a single-stage gear series transmission direct output; the other is a two-subject transmission output through the gears on the two flexible torsion bars and the gears on the output shaft.
The main reducer transmission system is extremely complicated, and the transmission system of the main reducer cannot be analyzed by a general design method.
In order to better design the transmission system of the main reducer, the total function of the system is decomposed into relatively simple sub-functions, so that the relationship between the input quantity and the output quantity is more clear, and the physical principle required for conversion is more simple, so it is easy Solve. Therefore, the function of the subsystem is analyzed by the causal relationship or the purpose of the purpose of solving the transmission system of the main reducer. Functional analysis is not just a means of asking for solutions; it is also a method of profound understanding of things. Therefore, when designing the main reducer, do not start with the product structure, but design the main reducer from the functional analysis of the system. In order to grasp the questionable ability, the novelty has a higher design level.
4.1.4 Design and analysis of the preloading device of the thrust bearing The equipment driven by the main reducer is a twin-screw extruder. When the twin-screw extrusion granulator is running, it produces extremely high torque and extremely high axial force. Due to the axial thrust of the twin-screw extrusion granulator, the special arrangement bearing designed and produced by the German still bearing company for the twin-screw extruder main reducer is preloaded to ensure several series thrusts. The bearings are both at the same time and stressed, so that they can be balanced with the reverse thrust of the screw. After the balance, a tensioning device is needed.
4.1.5 Multi-point meshing gear strength calculation and force analysis Because the multi-point meshing gear is not balanced, the force action point and the force direction are different, so the use of general calculation and analysis methods will not work. In order to solve this key problem, the finite element analysis of multi-point meshing gear strength calculation and force analysis is adopted.
Similarly, the calculation of the torsion stress of the gear shaft and the key of the gearbox 4.2 technology 4.2.1 achieve the same spline phase of the two output shaft spline shaft heads. This is a very difficult and difficult key technology. To this end, a large number of technical materials were collected in this area, and the characteristics of different clamping structures and displacement adjustment methods of Japan Shima Seiki Italy, 3 companies and French stomach companies were studied, but it is difficult to guarantee the realization. Effect. According to the functional principle of the series transmission, the transmission component which is the easiest to achieve fine adjustment is found and solved, and the spline phase of the spline shaft of the two output shafts is solved.
After research and analysis, it is determined that the large gear assembled by the ring gear + hub + expansion cone sleeve is installed on the one shaft. When the expansion cone sleeve is loosened, the ring gear and the hub can be freely rotated relative to each other. When the spline phase of the spline shaft of the root output shaft reaches the design requirement value, the expansion taper sleeve is fastened with bolts. At this time, the ring gear and the hub cannot be arbitrarily rotated, and the tooth ring and the expansion taper sleeve are The over-expansion caused by the taper between the two is tight. The fine adjustment mechanism can be supplemented by the transmission torque; the two output shaft spline shaft heads can be adjusted. 4.2.2 Tooth surface load factor is large. On the basis of earnest research on the point strength, in order to further improve the gear fatigue strength, a large pressure is adopted. The angle gear cutter was also compared with the original Japanese Shidao Seiki in the material selection, and high-grade carburized steel with high strength and high toughness was selected.
4.2.3 The design of the casting structure of the main and auxiliary boxes of the gear box 4.2.4 The design of the main and auxiliary box of the gear box 4.3 Design innovation 4.3.1 Optimized design of the innovative point gear. There are many constraints in the gear optimization design. The more constraints are considered, the more difficult the solution is. This study considers the following 13 constraint undercut constraints; 2 avoids transition curve interference; 3 tooth tip thickness limit; 4 coincidence limit; 5 gear modulus limit; 6 tooth limit; 7 helix angle limit; 8 total block coefficient Limit; 9 gear ratio error limit; 10 slip rate limit; tooth width factor limit; 12 contact strength limit; 13 intensity limit.
4.3.2 Innovative point tooth shape and tooth direction modification optimization design.
4.3.3 Application of innovative point finite element in gear stress analysis.
5 The technical level uses a large modulus and pressure angle based on the balance of the strength of the contact bending and bending point.
In order to avoid the impact of the gear during the initial meshing, the tooth profile modification technology is adopted; for the torsion and bending deformation caused by the low speed heavy-duty gear transmission, the tooth direction modification compensation technology is adopted.
Compensation for manufacturing and assembly errors, resulting in a decline in gear transmission quality indicators, the gear manufacturing accuracy from the original, 8 009, 588 level 6 to 5.
Low-speed heavy-duty gear transmission, all gear shaft gear transmission shafts, all finite element analysis.
To meet the requirements of the gear contact bending and bending point strength, high strength and high toughness grade carburized alloy steel is used.
The design of the box body and the fuel tank are the body; the gearbox 6 has a total of five equations, including, 0, 5 calls and other 6 unknowns. The series of machining points on the machined surface are given in sequence, and the five unknowns can be solved by the above five equations. Medium, 5 is the lateral and height coordinates of the cutter core when machining this point. When the rotation of the workpiece and the combined motion of the tool move form a spiral motion, the spiral corresponding to the point can be machined. The series is given in turn, and the corresponding four pieces are obtained, and the required tooth shape can be processed by taking the spiral motion multiple times. Among them, the compound movement of the center of the tool.
The development and success of this reducer has broken the situation that our company only produces single-speed high-speed heavy-duty gears. At the same time, it has also achieved localization and filled the domestic gap, making our company the only one in the world that can design and The company that produces such reducers.
The development of this reducer has made it a new economic growth point for our company. Can not meet the domestic market; and then hit the international market. It can achieve a high reputation for our company; it also brings huge economic and social benefits to the company.
7 Conclusions 1 Through the actual work and practice, combined with the specific implementation in this course, the grating and digital display device can be installed in the horizontal carriage and bed height direction of the ordinary universal milling machine, and the position of the tool is adjusted according to the pre-calculated 4 crystals during operation. Repeat the spiral milling motion. No special CNC machine tools are required.
Some scholars include the earliest study of the torsion blade impeller in China. When milling the torsion blade impeller, it is only necessary to consider the tool offset according to the face tooth shape, just as in the case of milling the straight toothed compass. This is not correct, because when milling the torsion blade impeller along the same end of the line, the tooth surface normal is not in the same end face, 3. Therefore, it will cause tooth shape error, it is easy to waste. Because the French is biased to have a need to be righteous, there are digital display devices in one direction.
3 Conclusion With this method, only two digital display devices are needed, so it is the simplest cut line. In order to avoid the infeed knife marks, the initial contact position should be on the spiral surface of the workpiece which is virtually extended on the workpiece end.
Li Tewen. Gear meshing theory. Mechanical Industry Press, 1984.
Wu Daren. Differential Geometry. Science Press, 1984.
He Zhaotai, Liu Yuran. The surface of the surface is partially 0. Machinery, 2, 24.
Rong, designed the main reducer of the twin-screw extrusion granulator of the multi-function multi-stage gear transmission with the set power transmission, deceleration and speed-changing torque distribution.
The design of the fine adjustment mechanism for the phase of the two output shafts has effectively achieved the requirement of adjusting the functions of the two output shaft splines and the shaft spline phase.
On the sliding bearing lubricating oil, forced lubrication is used to supply oil separately. In order to avoid the oil returning, the vortex is generated, and the bearing temperature rises. Each bearing and bearing group has an independent oil return system.
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