Online loose body density measurement method and device

Abstract

The invention discloses an online loose body density measurement method and device and relates to the field of VAD (vapor axial deposition) of optical fiber preform rods. The device comprises a weight measurement module, a volume measurement module and a density calculation module, wherein the weight measurement module is fixedly arranged onto the lifting platform of VAD equipment for measuring the weight of a preform rod loose body; the volume measurement module is fixedly arranged outside a deposition cavity for scanning and calculating the volume of a preform rod loose body. The online loose body density measurement device implements measurement in a state that deposition of the preform rod loose body is completed. Therefore, the online loose body density measurement device can ensure safety of production of the preform rod loose body, timely and accurately feed density data of the preform rod loose body back, avoid rejection of a furnace tube due to the fact that low-density optical fiber preform rod loose bodies fall into the furnace tube, save offline testing operation, significantly reduce the workload and the working time of operators and effectively improve the production efficiency.

Description

technical field [0001] The invention relates to the field of VAD manufacturing of optical fiber prefabricated rods, in particular to a method and device for on-line measuring the density of a loose body. Background technique [0002] In recent years, the telecommunications industry has accelerated the construction of mobile base stations according to the "Twelfth Five-Year Plan", and due to factors such as anti-dumping of optical fiber preforms, the demand for the industry has grown rapidly, and there has been a huge shortage of optical fiber preforms in China, and this phenomenon Affected by the rapid growth of domestic telecommunications fixed asset investment, and the demand for optical fibers by domestic telecom operators will continue to grow rapidly in the next few years, it is extremely important for the current optical fiber preform production enterprises to stabilize and increase the production capacity of optical fiber preforms. meaning. [0003] For manufacturers...

AI Technical Summary

Problems solved by technology

[0007] (1) The loose body may directly crack the bottom of the furnace core tube during the falling process, causing the furnace core tube to be scrapped

[0008] (2) The fallen loose matter accumulates at the bottom of the furnace core tube, which may block the air inlet of the furnace core tube and cause the furnace core tube to be scrapped

Because the gas inlet is blocked, the process gas cannot enter the furnace core tube according to the set flow rate, so that the dehydration and sintering of the preformed loose body cannot achieve the expected effect

[0009] (3) The falling soot accumulates at the bottom of the furnace core tube. After accumulating to a certain height, the effective stroke of the preformed soot body will be shortened, causing it to fail to complete the normal dehydration process or sintering process, resulting in the scrapping of the furnace core tube

For off-line density testing, it is necessary to transport the loose body of the preform to the density tester. On the one hand, it increases the workload and working time of the operator, and reduces the production efficiency. Risk of damage in the process

At the same time, in order to improve production efficiency, the off-line density test is only a regular density test for a certain batch of preformed soot, and the phenomenon of low density of some preformed soots caused by unstable production cannot be ruled out.

When the preform soot that has not passed the density test is sent to the inside of the furnace core tube for dehydration and sintering, it increases the risk of the furnace core tube being scrapped

Images