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A calculated check of the factors limiting the distance between the supports and the dependencies determined makes it possible to assert that the recommended span limits can be expanded and brought to at least 200. Despite the theoretically proven possibility of increasing the span by more than 200, the limitation of the span of 200 is due to purely structural and installation considerations. It is obvious, firstly, that an increase in spans higher than 200 due to an increase in the sagging of the shaft line in the spans will lead to an undesirable increase in the so-called "edge loads" of the bearing bearings. Secondly, with a span of about 200 for the usual range of shaft diameters of 300-400 mm, the distance between the supports reaches about 11-12.5 m. Considering that, usually in practice, for technological and installation reasons, the maximum length of the intermediate shaft does not exceed 8 m, the recommended discharged arrangement of supports will lead to the presence of unsupported intermediate shafts in the shaft pipeline system. The presence of unsupported intermediate shafts creates some difficulties when installing the shaft line. However, overcoming these difficulties with the help of temporary mounting supports is ultimately very advisable, since with such a degree of sparsity of the supports, the shaft line acquires the maximum possible flexibility. It is estimated that it is possible to achieve a coefficient of flexibility for the existing range of shaft diameters in the order of 40-65 units, while the maximum value of the coefficient of flexibility on existing shaft pipelines does not exceed 7 units.
An experimental verification of the conclusions made about the possibility of increasing the distance between the supports beyond 125 was carried out on the shaft pipelines of the Serpukhov and Dneprostroy vessels.
On March 12, 1956, five of the nine bearings on the Serpukhov steamship's shaft line were removed, namely Nos. 1, 3, 5, 7 and 9. This made it possible to increase the maximum span value from 87 to 140.
At the same time, the coefficient of flexibility of the shaft increased from 1.2 to 13.2, i.e. eleven times. Since the specified time, the shaft line has been working quite normally on four supports. The maximum fixed oil temperature in the bearing bearings does not exceed 42 ° C.
To experimentally verify the possibility of increasing the span between the bearings to values close to 200, the shaft pipeline of the Dneprostroi steamship was selected. The shaft line, as can be seen from the diagram, has a combined arrangement of supports, i.e. under the first, second, third and fifth intermediate shafts there is one bearing each, and under the fourth intermediate shaft there are two bearings — Nos. 4 and 5.
On February 5, 1956, the steamship Dneprostroy sailed from Vladivostok to Petropavlovsk with the support bearing No. 4 removed. This made it possible to increase the span between supports No. 3 and 5 to 11 m or up to 198. At the same time, the shaft line worked quite normally, the oil temperature in the bearings did not exceed 40 ° C.
Currently, work on testing shaft pipelines with spans exceeding 125 is continuing, however, the results of theoretical follow-up and experimental verification of these results already allow us to make the necessary recommendations.
When designing shaft pipelines, the span of 125 should not be considered the upper limit, as is the case at present, but the lower limit. The most appropriate limits for choosing the size of the span between the supports should be 125-200. ১। ক্রিকেট প্রেমীদের জন্য 1xbet প্ল্যাটফর্মে রয়েছে অসংখ্য উত্তেজনাপূর্ণ বাজির সুযোগ। আইপিএল থেকে শুরু করে আন্তর্জাতিক টেস্ট ম্যাচ—প্রতিটি খেলায় আপনি লাইভ বেটিং করে উপভোগ করতে পারেন রোমাঞ্চ। বিশেষ করে যারা নতুন ব্যবহারকারী, তাদের জন্য রয়েছে চমৎকার স্বাগত অফার। আপনি যখন প্রথম অ্যাকাউন্ট খুলবেন এবং জমা করবেন, তখনই পাবেন অতিরিক্ত ফান্ড। এই সুযোগটি কাজে লাগাতে হলে অবশ্যই একটি নির্দিষ্ট কোড ব্যবহার করতে হবে, যা আপনার বোনাস বাড়িয়ে দেবে। 1xbet প্রোমো কোড ব্যবহার করে নিশ্চিত করুন আপনার বোনাস—এখনই সক্রিয় করুন এবং পেয়ে যান ৫০০০ টাকা। এটি শুধু শুরু, এরপর প্রতিটি জমায় মিলবে বিশেষ পুরস্কার। ক্যাশব্যাক, ফ্রিবেট, আ
