Gear processing should adopt different technology according to different structure and precision. In view of the large equipment investment, the selection of process mode (as shown in Table 1) usually takes full account of the existing resources. The control of micro deformation and process stability in the process of high-speed computer gong machining gear is relatively complex. Isothermal normalizing is usually used after blank forging in order to obtain good processing performance and uniform microstructure with trend deformation. For low-speed cylindrical gear with low accuracy requirements, gear shaving can be done before hot rolling, and no processing is required after hot rolling. There are many teeth in hot post processing of cylindrical gear according to the conditions Different from gear grinding, the cost of tooth cleaning is low, but the ability of tooth profile correction is weak, and the precision of gear grinding is high but the cost is high. The technology of edge dressing and drum tooth modification can significantly reduce the gear meshing noise and improve the transmission performance, which are widely used at present.
The straight bevel gear is mainly used in the differential. Due to the low speed and relatively low precision requirement, precision forging gear is recommended. The complicated and time-consuming manual operation of spiral bevel gear processing and machine tool adjustment has been replaced by modern special software and computer program. The introduction of finite element analysis makes the process parameter design more reliable and convenient. There are mainly two kinds of gear grinding: grinding and grinding. Due to the high cost, low efficiency and limitation of gear grinding, gear lapping is mostly used at present Recently, a large marine gear with world advanced level and equipped with adjustable propeller [gear: gear is a mechanical element with teeth on the rim that can continuously mesh and transmit motion and power. The meshing of teeth in mechanical parts has been used for a long time. Box was born in hangchi group. This product belongs to the transmission device of marine power propulsion system. It not only has the functions of deceleration, clutch and bearing propeller thrust, but also has the function of auxiliary power output and auxiliary power input, which can meet the requirements of French bv ship inspection unmanned engine room.
This product is designed and manufactured by hangchi technicians according to the order requirements of foreign customers. High speed computer gong processing synchronous belt wheel is specially equipped with adjustable paddle for transportation and ocean fishing vessels. The product is controlled by electricity and hydraulic pressure. It has clutch system and gear transmission system with clutch and deceleration functions. For the first time, the PTO / PTI function is realized on the gearbox at the same time, which can make the propeller obtain the best propulsion efficiency and realize the automatic control of ship forward and backward. The auxiliary power input can realize the function of ship emergency return when the main engine fails, and the auxiliary power output can generate power for the ship when necessary. This kind of function can be used not only as generator but also as engine, which can greatly meet the needs of users.
The product has large speed ratio and wide application range. Hangchi installed the liquid level alarm for the first time in this product. All controllers and transmitters of synchronous belt pulley are imported brands. Make its performance more safe and reliable. The gearbox adopts double pump, which simplifies the design of hydraulic system and reduces the possibility of failure.
- The tightness of the sprocket should be appropriate. If it is too tight, the power consumption will be increased, and the bearing is easy to wear; if the sprocket is too loose, it is easy to jump and fall off the chain. The tightness of the chain wheel is: lift or press down from the middle of the chain wheel, which is about 2% – 3% of the center distance between the two chain wheels.
- There should be no swing and skew when the sprocket is installed on the shaft. In the same transmission component, the end faces of two sprockets should be in the same plane. When the center distance of sprocket is less than 0.5 m, the deviation can be 1 mm; when the center distance of sprocket is more than 0.5 m, the deviation can be 2 mm. However, there should be no friction on the side of sprocket teeth. If the offset of two wheels is too large, it is easy to cause chain shedding and accelerated wear. Pay attention to check and adjust the offset when replacing the sprocket.
- When the sprocket is seriously worn, the new sprocket and new sprocket should be replaced at the same time to ensure good meshing. Do not replace new sprocket or new sprocket separately. Otherwise, it will cause bad meshing and accelerate the wear of new sprocket or new sprocket. When the tooth surface of the sprocket is worn to a certain extent, it should be turned over in time to extend the service time.
- If the new sprocket is too long or elongated after use, it is difficult to adjust. The chain link can be removed according to the situation, but it must be even. The chain link shall pass through the back of the chain wheel, the locking plate shall be inserted outside, and the opening of the locking plate shall face the opposite direction of rotation.
- The sprocket should be filled with lubricating oil in time. Lubricating oil must enter the clearance between roller and inner sleeve to improve working conditions and reduce wear.
- The old chain wheel can not be mixed with some new ones, otherwise it will cause impact in the transmission and break the chain wheel.
- When the machine is stored for a long time, the sprocket wheel should be removed and cleaned with kerosene or diesel oil, and then coated with oil or grease and stored in a dry place.
2、 The structural design of the sprocket:
- Tooth profile of sprocket
The tooth shape of the chain wheel must ensure that the chain can enter and exit the meshing smoothly and smoothly, reduce the impact and contact stress of the chain link during meshing as far as possible, and it should be easy to process.
The common tooth profile of sprocket end face is composed of three arc AA, AB, CD and a straight line BC, which is called three arc straight line profile for short. The tooth profile is processed with standard cutter. It is not necessary to draw the end face tooth profile on the sprocket working drawing. It is only necessary to mark “the tooth profile is manufactured according to the provisions of 3rgb1244-85” on the drawing. However, the axial tooth profile of the sprocket shall be drawn, as shown in Fig. 2, and the dimension shall refer to the relevant design manual. ginseng
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