Improvement of the structure of SGB42020(30) type scraper conveyor reducer
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Journal of Anhui Institute of Architecture and Industry, Natural Science Edition, 4220030, Scraper Conveyor, Improvement of the Structure of the Reducer. Xu Qin, Department of Control Science and Engineering, Nanjing Normal University, Nanjing 210042, Analysis and improvement of the shaft structure of the reducer of the 30-type scraper conveyor In order to solve the problem of replacing the vulnerable first axis in the field. It provides convenience for her mining machinery. The scraper conveyor is a mining machine that transports materials. It is mainly used to transport coal at the gently inclined blasting coal mining face. It can also double as a shearer track during transportation. The crew works together and is sometimes used in surface coal preparation plants and on-site production systems. Because of its short fuselage, bendability, large transport capacity, high structural strength, good safety and economical work, it is still used as a transportation equipment for gently inclined longwall coal mining face. This paper mainly analyzes the causes of the damage of the first shaft of the 38.4202030 scraper reducer and proposes the improvement measures.
1 The reason for the destruction of the transmission part is that the reverse conveyor is mainly composed of the partial part of the actuation part and the like, and the speed reducer of the flower integration machine is the key component of the present. It is responsible for transmitting the power to adjust the rotation speed in time. A properly structured reducer plays a very important role in ensuring the normal operation of the machine, increasing productivity and extending the life of the machine. It can be seen from the conventional double-chain type flexible scraper conveyor used in China that the first shaft of the reducer is the input shaft of the reducer, which is the arc-toothed bevel gear shaft, which is in the entire power transmission system. The motor shafts are directly connected. Therefore, the rotation speed of the first shaft during operation is very high, and the working torque is generated at a very high working temperature. The entire shaft is operated under high temperature and heavy load conditions, which requires the first shaft to be structurally To be reasonable in design, it is also required that the installation position of each part must be accurate during installation, otherwise there will be a large deviation in the transmission, which will cause a large power loss in the whole transmission process. The conveying object of the scraper conveyor is the coal block which is collapsed by the blasting or the comprehensive machine mining. The working environment is the coal mining face under the coal well, and the impact load and the overload operation are often encountered in the working process. Due to these harsh working conditions, coupled with their own structural reasons, the shaft-arc gear in the first shaft is easy to wear when used, and needs to be replaced frequently.
2334202030 type reducer structural defects The structure of the first shaft of the reducer 2, mainly consists of shaft arc bevel gear 1 spherical roller bearing 2 bushing 3 retaining ring 5 centripetal thrust ball bearing 6 nut 8 and so on. During installation, the convex edge of the upper retaining ring is installed in the notch of the upper and lower casings, and the left-hand contact of the casing and the convex edge is used to face the radial thrust ball bearing, and the casing can also be utilized during operation. The groove is used to withstand a fixed axial force. The bearing is reversed and, although the bearing rigidity of the shaft is high, the gap between the bearings is adjusted by the sleeve retaining ring and the nut.
Such a structure brings inconvenience to the production and maintenance of the speed reducer. Firstly, when the shaft arc bevel gear needs to be replaced after being worn, since the convex edge of the retaining ring is inserted into the casing to make the first shaft difficult to take out, the cover must be opened for removal when the replacement is performed. This is a time-consuming and laborious task for a small working face with a poor working environment.
4 outside. Since the housing material of the reducer is mostly 1250, and the shaft is operated under the conditions of heavy and heavy load, impact load and other heavy and complicated conditions, the gears on the shaft circular arc gear spherical roller bearing are engaged during operation. When the radial force and the axial force are not large, the spherical roller bearing and the core thrust ball bearing are assumed, and the position of the shaft is adjusted to make the shaft normal. jobs. However, under the continuous action of the radial force, friction will occur between the spherical roller bearing and the box. Since the outer ring material of the spherical roller bearing is better than the box material, the spherical roller bearing and the box There will be gaps between the bodies. Due to the existence of the magazine gap, the axis will produce offset and wobble when working. The offset of the shaft in the radial direction can be adjusted by the spherical roller bearing.
However, when the box body is under the continuous action of impact load and heavy load, the crushing failure of the contact surface between the box body and the bearing will eventually cause the gap to increase, and the spherical roller bearing will lose its self-aligning effect. When the shaft is in operation, it oscillates in the radial direction with the gear meshing point as a fulcrum, and the entire shafting component does not have an accurate working position on the base. In addition, the shaft arc bevel gear will also generate a large axial force during operation, which will cause the shaft to sway. When working normally, this deformation is adjusted by the parts of the shafting. Due to the frequent impact loads and heavy loads during operation, and the radial oscillation of the shaft during operation, the failure of the spherical roller bearing itself is accelerated when the axial radial load is increased to a certain extent. The gap between the rolling element and the outer ring is increased. As can be seen from 2, the outer ring of the spherical roller bearing has no axial positioning device, so when the box is crushed, the outer ring of the spherical roller bearing is When working, it will be thrown out into the box, so that the outer ring and the shaft arc bevel gear will collide and affect the transmission, which will generate a lot of noise. In addition, due to the continuous axial force during operation, the groove on the box is large. The left side surface and the retaining ring also produce a certain amount of wear, so that the axial position of the entire shaft changes during operation, and the axial sorrow causes the shaft end gear of the first shaft and the gear of the first shaft to fail normally. It is difficult to clarify the accuracy of the sound, which brings certain difficulties to the processing.
According to some defects exposed during use, the user has proposed an improvement on the structure of the reducer. 1 After the first shaft is damaged, it can be changed by the simpler and the small need to sweat (2) through the structural modification of the farm to eliminate the transmission. The question of the violent sue, the 3 improvement plan is aimed at the above requirements and the working condition of the scraper. For the structure of the reducer, the first shaft part of the hall is improved 4. Yes. The structure is adjustable, the entire shafting is mounted in the bearing sleeve, the nut is left-positioned by the bearing sleeve and the radial thrust ball bearing, and the nut and bearing cap are used for the axial position of the first shaft on the casing. 12 to adjust, turn the adjustment nut to change the position of the shaft system. Therefore, when the axial position of the shaft is slightly moved during manufacturing, installation and use, it can be easily adjusted. Furthermore, when the shaft end teeth of the first shaft are worn, the bearing cap and the entire shafting component are conveniently removed and replaced without the need to open the cover, saving time and effort; secondly, due to the aligning roll The sub-bearing and the bushing material are directly matched with the 45 steel instead of the direct contact with the box body. Therefore, when the first shaft is working, it does not occur in the case of the wear and crushing of the rabbit. Make the entire drive precision capture. The noise is reduced. Effectively prevent the occurrence of some unfavorable situations. In addition, the spherical roller bearing has been fixed by 1 because of the high precision of the rotation of the components. Therefore, the right-hand bearing of the shaft still uses the counter-center thrust bearing, and the radial thrust ball bearing is reversed. Changed to formal wear, and put a cushion between the inner rings of the bearing before assembly. When assembling, the nut is pre-tightened so that the inner rings of the bearing are pressed against each other, so that the initial deformation of the rolling element in contact with the inner and outer rings is generated. In order to eliminate the original internal clearance, the rigidity and rotation precision of the bearing assembly are improved, the life of the bearing is improved, the vibration of the shaft is reduced, and the vibration of the first shaft member is reduced at a high speed operation, and the operation is more stable. In addition, the adjustment of the bearing clearance is mainly done by the outer ring, which makes the bearing more convenient during installation and adjustment. The problem of making the field changeable to the vulnerable shaft difficult is solved. Bringing extreme care to the maintenance. This improves and improves the overall transmission conditions. Practice has proved that such a transformation is feasible. Of course, the modification of this structure varies from manufacturer to manufacturer, but it is based on the needs of the site and the improvement of labor productivity.
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