Research On Last-Stage Pinion Device With Self-Aligning In The Heavy-Load Low-Speed Driving

With the needs of technology, in metallurgy, building materials and chemical industries etc, there are some heavy-duty rotating equipment, such as sintering machine, oxygen converters and rotary device etc. Heavy-load low-speed driving system occupies an important position in the heavy–duty operation. From 1950s in the 20th century, foreign countries started to develop the application of flexible-transmission technology. In the late of 1970s, China gradually developed the multi-channel engaging device, and introduced a number of such complete sets of equipment. This paper dedicates to research on last-stage pinion device with self-aligning in heavy-load low-speed driving and study on its structure, theory and design of multi-channel engaging and self-aligning pinion in order to provide our country the technical references for the development and application in this field.Based on analysis of the mechanism, advantages and disadvantages of BF-type, BFP-type, and BFT-type, multi-channel engaging, combining the features of BF-type, and BFP-type,, the paper introduces the innovative design of the dual-track type, dual-point meshing with single-drive BF multi-channel engaging device and its features.Because the common malpractice of BF-type (including particular BF type), BFP-type transmission is that the rotating wheel must endure a certain degree of the wheel-pressure in order to maintain the distance between centers of big and small gears and operate stably, as a result that the wheel-pressure will inevitably cause the abrasion between the wheel and track, in actual operation, not only will the wheel has more frequent replacement, but also the gear will reduce its service life.The successful development of double-track flexible driving with multi-channel engaging makes it possible that the wheel-pressure can be zero in theory with lots of functions between the rotating-wheel and track in the condition of the single-point meshing. The operation function of this new transmission device is not single but contains all functions of BOGILEX transmission in any single meshing point, also when it operates in BF and BFP way, the wheel-pressure is likely to be lower. The dual-point meshing in single-drive BF flexible-transmission device will promote its bearing capacity by two small pinions which are setting in a small slung trolley to driving big one altogether.To aim at the last-stage pinion excessive wear, which causes the reduction of its service time in the last-stage transmission device inф3200 incinerator in an enterprise, the paper suggests a kind of device changing the last-stage transmission into the self-aligning engaging so as to solve bad meshing problem in the last-stage transmission.Due to the most prominent feature of self-aligning engaging device is to transfer engine power by drum-shape gear and self-aligning defluxion, This paper analyzes its transmission mechanism, structure and stress distribution based on the understanding of DMGH transmission theory; and according to the requirements of the last-stage transmission in incinerator, creatively designs 3 different types for self-aligning pinion structures, demonstrates the detail reforming proposals and drum-shape pinion structure design. Also, in order to make deeper research on dynamics of drum-shape gear transmission system of self-aligning pinion device, this paper presents the last-stage self-aligning pinion experimental device in heavy-load and low-speed transmission and puts it into experimental use.Directed towards the current exist problems for calculating formula in BFT flexible-driving theory, the paper establishes the new coordinate system; makes 3 different dynamic analysis of BFT flexible-driving in the last-stage uneven loading; solves the issue of the precise theoretical calculation in all kinds of uneven loading condition so that the precise theoretical calculating formula is obtained in the condition of the whole and uneven degree loading, and makes convenient project calculation with these formula.Meanwhile, the paper proposes 2 ways to determine the optimum structure parameters and verifies by examples that the one is Attempting Method, which can identify the more suitable parameters quickly and provide the similar solution to the other pattern flexible-driving design; the second is Optimizing Design Method, which can optimize structure and parameters for the flexible-driving device.Since the self-aligning pinion device has been applied in recent years in foreign countries and its design and manufacturing methods belong to the scope of patents, there is no any public information. The paper demonstrates the design method for the nucleus part, drum-shape gear based on the stress distribution analysis of the self-aligning pinion device and uses the method to design a self-aligning pinion experimental device according to the parameters and structures, successfully makes experiments with a prototype of self-aligning pinion to provide a basis for the device and series of devices.For the easy analyzing the tooth displacement and seamed-edge block phenomenon in drum-shape pinion in self-aligning pinion device and explaining a tooth circumferential position, the paper consults in the meshing analysis of the shift jointer of the drum-shape gear, simplifies the inner and outer movement of the drum-shape pinion to an unfolded planar motion; firstly, the paper sets equations for its tooth surface according to non-conjugating tooth meshing condition so as to obtain a series of nonlinear equations; then, uses MATALAB optimization to solve the numerical value of the meshing points coming to the conclusion for both inner and outer tooth meshing movement disciplines.Based on the co-analysis between the drum-shape pinion and inner gear on the pinion, and the bias loading analysis for the self-aligning pinion device structure, the paper introduces the flexible-multi-body dynamics theory, establishes a dynamics model for self-aligning pinion system, the flexible-multi body system. Since this self-aligning device in this transmission belongs to a self-adaptive rotating flexible component, we need to set up the multi-rigid dynamics model and to analyze its movement transmission based on this model, then, to introduce dynamics model of the flexible-multi-body system; at last, to identify the vibration characteristic of the torque fluctuations in self-aligning pinion device resulting in the relations between the torque and the stress in different slight deformed angles.