Tooth synchronous belt use "climb" phenomenon in the mechanical solution countermeasures
[abstract] :
Studied the characteristics of the tooth synchronous belt, the advantages and disadvantages.
Pointed out that textile machinery in the use of the points for attention during the tooth synchronous belt and the basic requirements of daily prevention. Tooth synchronous belt is discussed the mechanism of mechanical wave \"climb\" phenomenon, this paper proposes the methods of prevention \"climb\" phenomenon, key points and solving measures.
For the use of tooth synchronous belt textile enterprises have important guiding significance.
Synchronized with a single tooth and two double toothed, hereinafter referred to as single and double sided tape.
Double-sided tape and symmetry tooth type (DA) and staggered tooth type (DB).
Synchronous belt with trapezoidal tooth synchronous belt and arc gear synchronous belt.
Synchronous belt type can be divided into the most light MXL, ultralight XXL, XL light, light and heavy H L, track, super-heavy XXH XH, seven.
Trapezoidal tooth synchronous belt transmission existing standards (GB11361 ~ 11362-89).
Under the specified tension, the linear distance between two teeth centerline is called the pitch, with p said. Pitch is the most basic of synchronous belt transmission parameters.
When the synchronous belt vertical its bottom edge bending on the belt to keep the original length constant weekly, called the pitch line, line length to LP said. Synchronous belt pulley of the tooth profile involute tooth profile, is recommended for the available generation method. Can also use straight tooth.
1, the tooth shape with characteristics and main advantages
1.1 the precise forming of tooth synchronous belt and pulley groove perfectly
1.2 high strength nylon fiber cloth to protect tooth type face
1.3 the biggest load can reach 1000 kw
1.4 not easy to produce skid phenomenon when it is started
1.5 transmission wide speed range
1.6 no lubricating oil, also need not adjust because of the extension and wear
1.7 high mechanical transmission power ratio
1.8 a constant speed
1.9 a long working life
2, polyurethane synchronous belt
Is a high strength low stretch chemical fiber rope or wire for the skeleton, covered with polyurethane pouring glue, double or single assumes the circular arc tooth profile, with oil resistance, abrasion resistance, shock absorption, noise is small and other advantages
Features: both gear, chain and belt drive one's own advantage, do not need lubrication, small slip, no pollution, low noise, compact structure, the characteristics of stable running.
There are more and more textile equipment USES the tooth shape with belt.
3, tooth synchronous belt use \"climb\" phenomenon in mechanism
Although there are many advantages of synchronous belt transmission, but also has many defects, such as short service life, wear-resisting, tooth stripping phenomenon is serious, as well as the meshing, skip, vibration.
With synchronous belt transmission process and transmit motion produced by the transmission error, synchronous belt on tooth profile will appear on the surface, because of the several times of N accumulation error. It can make the top round toothed climb on pulleys, synchronous cog belt on the pulley top circle sliding tooth. This is called \"climb\" phenomenon;
In addition to the above reason may produce \"climb\" phenomenon, there are:
3.1 synchronous belt tension is not appropriate.
3.2 or tooth synchronous belt wheel surface with oil
3.3 transmission of toothed wheel are not at the same level with toothed wheel (that is, the parallel degree error);
3.4 synchronous cog belt belongs to the elastomer, in the process of manufacturing and force changes with tooth pitch, synchronous belt tooth and tooth in meshing time distance, appears the pitch error. Excessive pitch error, can make the drive is not smooth, vibration and climbing gear phenomenon;
3.5 starting frequently and have a shock load, lead to jump out from toothed belt tooth groove, also can produce climbing gear
3.6 application of synchronous cog belt must prevent overload, otherwise also prone to \"climb\" phenomenon.
3.7 some enterprises using the synchronous cog belt, but to form a complete set of tension wheel \"tension\" size is not very good grasp, or to increase tension, or lack of tension.
3.7.1 tension round the dangers of excessive tension: it is well known that when the tension roller is too large, add tension shaft stiffness is insufficient, can cause tension shaft head bending deformation, which happen to beat, the beat is harmful, it makes the transmission is not steady and produce high-frequency oscillation, resulting in a higher harmonic.
3.7.2 tension wheel, increased tooth synchronous belt \"climb\" phenomenon brings adverse situations.
Synchronous cog belt \"climb\" phenomenon for textile equipment, such as: drawing frame, carding machine, roving frame, and so on, are very harmful. And mechanical wave generated by the \"climb\" phenomenon is one of the important reasons. Moreover, the \"climb\" phenomenon often has the characteristics of irregular, so often will produce more complex \"multiple mechanical wave\", this kind of \"multiple mechanical wave\", and sometimes asexual, difficult to find its trace. Increased the complexity of the solution to mechanical wave with difficulty!
4, solve the tooth synchronous belt use \"climb\" phenomenon of countermeasures
4.1 to ensure accuracy of transmission, for factory, we must improve the synchronous belt with tooth gear manufacturing precision to ensure that the pitch with equal pitch.
4.2 solve the manufacturing of pitch error and accumulated error '
4.3 the appropriate additive tension: synchronous belt transmission to a proper tension. Such as drawing frame FA317A product manuals enclosed is the tension adjustment is convenient for the maintenance of tension adjustment, and to ensure that no mechanical wave produced because of improper tension.
4.4 to ensure that the use of synchronous belt and tooth profile wheel surface can't have any stain.
4.4 toothed wheel and tooth profile wheels must ensure the parallelism in the manufacture, installation;
4.5 solve the toothed wheel machining accuracy, prevent the vibration of synchronous belt;
4.6 using cog belt transmission machinery, avoid frequent starting, in order to prevent the shortened lifespan;
4.7 on a regular basis to the cog belt, toothed wheel surface with anhydrous ethanol for cleaning and maintenance, to ensure that no pollution;
4.8 regular inspection on cog belt tension;
4.9 the combination of semi-product mechanical wave detection wave spectrum analysis, find and solve problems in a timely manner.
5 conclusion
5.1 tooth synchronous with the superior transmission performance;
5.2 tooth synchronous belt transmission errors caused by long-term use, synchronous belt tension is too small, or tooth synchronous belt wheel surface has occurred in the operation of the oil, pitch error, and frequent starting and impact load, overload will have an \"climb\" phenomenon
5.3 using tooth synchronous belt \"climb\" phenomenon is the root of the problem was the cause of mechanical wave;
5.4 the author put forward to prevent tooth synchronous belt \"climb\" phenomenon of 9 measures, can effectively solve the mechanical wave due to \"climb\" phenomenon.
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