CN203558972U

CN203558972U - Device for stretching optical fiber preform

Info

Publication number: CN203558972U
Application number: CN201320707447.3U
Authority: CN
Inventors: 李要飞; 肖华; 王友兵; 李晓东; 马康库; 杜森; 劳雪刚; 王亚玲
Original assignee: Jiangsu Hengtong Optic Electric Co Ltd
Current assignee: Hengtong Optic Electric Co Ltd
Priority date: 2013-11-11
Filing date: 2013-11-11
Publication date: 2014-04-23
Anticipated expiration: 2023-11-11

Abstract

The utility model relates to a device for stretching an optical fiber preform. The device comprises an RIC rod composed of a quartz sleeve and a quartz mandril, wherein an upper handle of the RIC rod is clamped and fixed by an upper clamp; a lower handle of the RIC rod is clamped and fixed by a lower clamp; the upper clamp, the lower clamp and a heating furnace can move up and down. In the stretching process, the heating furnace moves from top to bottom to generate heat, and the upper clamp moves upwards while the lower clamp moves downwards so as to provide drawing force; the heating furnace moves from top to bottom at a first speed V1, meanwhile, the upper clamp moves upwards at a second speed V2, the lower clamp moves downwards at a third speed V3, and thus the softened RIC rod is stretched so as to produce the optical fiber preform.

Description

A kind of device that preform is stretched

Technical field

The utility model relates to preform processing technique field, especially relates to a kind of device that preform is stretched.

Background technology

In order to improve the production efficiency of fibre-optical drawing, as producing the preform of fibre parent material progressively to large size future development.A kind of high-level efficiency, the production method of large-scale optical fiber prefabricating stick cheaply in patent document CN101328012A, have been introduced: the rock quartz core rod that VAD method is produced and quartz socket tube are combined to form RIC rod (as Fig. 1), utilize process furnace from bottom to up RIC rod to be heated to (as Fig. 2), use vacuum pumping technology to make, together with the molten contracting of plug and quartz socket tube, to form preform simultaneously.

The length of the quartz socket tube (1 length L in Fig. 1) using in patent document CN101328012A is longer, and the efficiency of producing preform is also just higher, and the material use efficiency of quartz socket tube is also just higher simultaneously.

While adopting the mode that above-mentioned process furnace heats from bottom to top, according to physical principle, quartz is under molten state, the maximum height that normal atmosphere can hold up rock quartz core rod is about 4.6m, if when quartz socket tube length (L in Fig. 1) exceedes 4.6m, in drawing process, rock quartz core rod will, with respect to quartz socket tube down sliding (position as shown in Fig. 2 8), affect the quality of preform.

That is to say, in the method described in patent document CN101328012A, cannot use and exceed the long quartz socket tube of 4.6m.

Utility model content

The utility model provides a kind of new stretching device, can solve the technical problem of plug landing in above-mentioned drawing process, can realize the use of long quartz socket tube, produces overlength quartz prefabricated rods, improves the production efficiency of quartzy prefabricated rods.

The utility model provides a kind of device that preform is stretched, and this device comprises: the RIC rod being combined by quartz socket tube and rock quartz core rod, and the upper handle of this RIC rod is gripped by upper fixture, and lower handle is gripped by lower clamp; Wherein, upper fixture, lower clamp, process furnace can move up and down; In drawing process, by process furnace is mobile, produce heat from top to bottom, upper fixture moves up, lower clamp moves down provides drawing force.

Further, process furnace moves from top to bottom with First Speed, and meanwhile, upper fixture upwards moves with second speed, and lower clamp moves with third speed downwards, and softening RIC rod is stretched, and produces preform.

The utility model overcome that prior art exists because of the oversize defect that cannot stretch of quartz socket tube, can realize the use of long quartz socket tube, realize the production of overlength optical fiber prefabricated rods, improve the production efficiency of preform.

Accompanying drawing explanation

Fig. 1 is the structure iron of the qualified RIC rod produced: 1 is quartz socket tube, and 2 is rock quartz core rod, and 3 is upper handle, and 4 is lower handle, and L represents the length of quartz socket tube.

Fig. 2 is the schematic diagram of existing stretching device during for long quartz socket tube; Wherein 1 is RIC rod; 2 is the preform having stretched; 3 is the upper handle of RIC rod; 4 is the lower handle of RIC rod; 5 is the upper fixture for stretching; 6 is the lower clamp for stretching; 7 is process furnace; 8 is rock quartz core rod landing position; V1 is First Speed; V2 is second speed; V3 is third speed.

Fig. 3 is the schematic diagram according to stretching device of the present utility model, and wherein 1 is RIC rod; 2 is the preform having stretched; 3 is the upper handle of RIC rod; 4 is the lower handle of RIC rod; 5 is the upper fixture for stretching; 6 is the lower clamp for stretching; 7 is process furnace; V1 is First Speed; V2 is second speed; V3 is third speed.

embodiment

Below in conjunction with Figure of description, the utility model is specifically described.

First, by quartz socket tube and rock quartz core rod combination RIC rod, as shown in fig. 1, RIC rod comprises quartz socket tube 1, rock quartz core rod 2, and the upper handle 3 of welding and lower handle 4.

RIC rod is placed on stretcher, and upper handle 3 is gripped by upper fixture 5, and lower handle 4 is gripped by lower clamp 6.Wherein, upper fixture 4, lower clamp 6, process furnace 7 can move up and down.

In drawing process, by process furnace 7, produce heat, upper fixture 5, lower clamp 6 provide drawing force.

Process furnace 7 heats RIC rod 1, and by softening RIC rod 1, with First Speed, V1 moves from top to bottom.

Meanwhile, upper fixture 5 upwards moves with second speed V2, and lower clamp 6 moves with third speed V3 downwards, and softening RIC rod is stretched, and produces preform.

Because process furnace heats RIC rod from top to bottom, rock quartz core rod is to soften successively from top to bottom, the rock quartz core rod that does not soften bottom can provide enough anchorage forces to softening rock quartz core rod, therefore do not have the situation of rock quartz core rod and quartz socket tube relatively sliding, the theoretical length of quartz socket tube is will being no longer subject to the restriction of drawing process.

Stretching step in the utility model is: utilize process furnace to heat from top to bottom, rock quartz core rod and quartz socket tube are softening successively from top to bottom, while softening below, rock quartz core rod can provide enough anchorage forces, and the relatively sliding of quartz socket tube and rock quartz core rod can not occur.

According to this method, the information of the quartz socket tube of having produced and the rear preform that stretches is as shown in table 1 below at present, can significantly improve the production efficiency of preform.

Table 1

Quartz socket tube length/m	Optical fiber prefabricating rod outside diameter/mm	Overall length/m after stretching	Estimate drawing optical fiber length/Km
				6	150	11	16000
6	180	7.8	16000

The above, it is only the utility model exemplary embodiments, not technical scope of the present utility model is imposed any restrictions, any trickle modification, equivalent variations and modification that every foundation technical spirit of the present utility model is made above enforcement, all still belong within the scope of the technical solution of the utility model.

Claims

1. device preform being stretched, is characterized in that this device comprises:

The RIC rod being combined by quartz socket tube and rock quartz core rod, the upper handle of this RIC rod is gripped by upper fixture, and lower handle is gripped by lower clamp; Wherein, upper fixture, lower clamp, process furnace can move up and down; In drawing process, by process furnace is mobile, produce heat from top to bottom, upper fixture moves up, lower clamp moves down provides drawing force.

2. device according to claim 1, is characterized in that:

Process furnace moves from top to bottom with First Speed, and meanwhile, upper fixture upwards moves with second speed, and lower clamp moves with third speed downwards, and softening RIC rod is stretched, and produces preform.