CN106746585B - Optical fiber perform conical head processingequipment - Google Patents
Optical fiber perform conical head processingequipment Download PDFInfo
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- CN106746585B CN106746585B CN201611114512.6A CN201611114512A CN106746585B CN 106746585 B CN106746585 B CN 106746585B CN 201611114512 A CN201611114512 A CN 201611114512A CN 106746585 B CN106746585 B CN 106746585B
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- cooling cylinder
- furnace mouth
- optical fiber
- cooling medium
- mouth cooling
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
- C03B37/01225—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing
- C03B37/01251—Reshaping the ends
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/47—Shaping the preform draw bulb before or during drawing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Abstract
An optical fiber perform conical head processing device belongs to the technical field of optical fiber cable production facilities. Including the furnace body, be equipped with the graphite heating body, its direction of height has optical fiber perform heating chamber, and the upper portion in optical fiber perform heating chamber is for going up fire door, lower part for fire door down, characteristics: an upper furnace mouth cooling cylinder is arranged at the upper part of the furnace body, the cavity of the upper furnace mouth cooling cylinder corresponds to the upper furnace mouth, and an optical fiber perform suspension mechanism is arranged at the top of the upper furnace mouth cooling cylinder and is in sealing fit with the top of the upper furnace mouth cooling cylinder; the lower part of the furnace body is provided with a lower furnace mouth cooling cylinder, the cavity of the lower furnace mouth cooling cylinder corresponds to the lower furnace mouth, the side surface of the lower furnace mouth cooling cylinder is provided with an observation operation door and is connected with a vacuumizing mechanism, and the bottom of the lower furnace mouth cooling cylinder is provided with a quartz lump collecting barrel. The graphite heater is protected, and the surface of the optical fiber preform is prevented from being polluted by impurities in air entering the furnace from the outside at high temperature; the structure of the furnace body is simplified; the stability of the temperature in the furnace is improved; the safety is guaranteed.
Description
Technical Field
The invention belongs to the technical field of optical fiber cable production facilities, and particularly relates to a device for processing a conical head of an optical fiber preform.
Background
An optical fiber is drawn from an optical fiber preform, and specifically, the optical fiber preform is heated to a molten state by a drawing furnace, and the optical fiber is drawn with the optical fiber preform in the molten state. In order to ensure that the ratio of the optical fiber drawn from the optical fiber preform is consistent with the core cladding (core layer and cladding) of the optical fiber preform, reduce the material loss at the beginning of drawing, and shorten the fused cone forming time of the optical fiber preform, a streamline-shaped cone head needs to be processed in advance at the drawing end of the optical fiber preform before drawing.
At present, there are two main methods for forming the cone head at the wire drawing starting end of the optical fiber preform; a method for heating the optical fiber preform by using a graphite induction heating furnace and tapering by self weight; the other is a method for heating the tapering by using oxyhydrogen flame. The former is to vertically place an optical fiber preform in a graphite induction furnace, heat the tapered part of the optical fiber preform to soften the tapered part, and freely form a uniform streamline cone head by means of self gravity; the latter is to soften the tapered part of the optical fiber prefabricated rod by the heat generated by the combustion of hydrogen and oxygen, butt joint a quartz tail handle in the softened state, and then form a streamline conical head by stretching. Since the latter is more troublesome and less efficient than the former, the former is currently preferred in the industry, and for this purpose, reference is also made to the evaluation of paragraphs 0002 to 0004 of the specification "a method for increasing the service life of a graphite member in an optical fiber preform drawing furnace" recommended in CN101481209B and paragraphs 0003 to 0004 of the specification "a method and an apparatus for manufacturing an optical fiber preform" provided in CN 105271694A.
The current measure for preventing external air from entering the furnace is to use inert gas instead of furnace air, so as to protect the graphite piece and the optical fiber preform (see paragraph 0021 of the aforementioned specification CN 101481209B). The introduction of inert gas into the furnace, although effective to some extent in mitigating oxidation of the graphite member and the optical fiber preform, does not completely prevent air from entering the furnace, and moreover, increases the production cost due to the use of inert gas.
Objectively, the two aforementioned patent proposals can bring out their respective technical effects described in the technical effect column of the specification, but have the following general disadvantages: firstly, because the environment in the furnace is not in a vacuum state, the air in the furnace, particularly the air entering the furnace from the outside, can affect the graphite heating element and the optical fiber preform, for example, the service life of the graphite heating element is affected, and if impurities in the air are attached to the surface of the optical fiber preform at high temperature; secondly, the graphite heating element needs to be protected by inert gas, so that the processing (i.e. production) cost is obviously increased; thirdly, as protective gas is required to be introduced into the furnace, on one hand, the complexity of the furnace body is increased, and on the other hand, the temperature zone in the furnace is unstable, and finally the size of the conical head of the optical fiber preform rod is unstable; fourthly, since the cut quartz lump falls in a state of being scattered without bundles, the environment of the operation site is damaged, and the limbs of the on-line operator are also damaged.
In view of the above-mentioned prior art, there is a need for improvement, for which the applicant has made an advantageous design, resulting in the solution described below.
Disclosure of Invention
The invention aims to provide an optical fiber preform taper end processing device which is beneficial to forming vacuum in a furnace in a heating state so as to protect a graphite heating body of the furnace body, avoid the pollution of impurities in air entering the furnace from the outside at high temperature on the surface of an optical fiber preform, abandon the use of protective gas so as to obviously reduce the processing cost, simplify the structure of the furnace body, improve the stability of the temperature in the furnace, ensure the quality of the taper end size of the optical fiber preform, and control the cut quartz lumps so as to improve the environment of an operation place and avoid damaging limbs of online operators.
The task of the invention is completed in such a way, the invention relates to an optical fiber perform conical head processing device, which comprises a furnace body, wherein a graphite heating body is arranged in the furnace body, an optical fiber perform heating cavity is formed in the center of the graphite heating body in the height direction, the upper part of the optical fiber perform heating cavity is an upper furnace mouth of the furnace body, the lower part of the optical fiber perform heating cavity is a lower furnace mouth of the furnace body, the invention is characterized in that an upper furnace mouth cooling cylinder is arranged at the upper part of the furnace body and at the position corresponding to the upper furnace mouth, the upper furnace mouth cooling cylinder cavity of the upper furnace mouth cooling cylinder corresponds to the upper furnace mouth and is communicated with the optical fiber perform heating cavity, an optical fiber perform suspension mechanism is arranged at the top of the upper furnace mouth cooling cylinder, and the optical fiber perform suspension mechanism is matched with the top of the upper furnace mouth cooling cylinder in a sealing way; and a lower furnace mouth cooling cylinder is arranged at the lower part of the furnace body and at the position corresponding to the lower furnace mouth, the lower furnace mouth cooling cylinder cavity of the lower furnace mouth cooling cylinder corresponds to the lower furnace mouth and is also communicated with the optical fiber preform heating cavity, the side surface of the lower furnace mouth cooling cylinder is provided with an observation operation door and connected with a vacuumizing mechanism for vacuumizing the optical fiber preform heating cavity, and the bottom of the lower furnace mouth cooling cylinder is provided with a quartz lump collecting barrel.
In a specific embodiment of the invention, the upper furnace mouth cooling cylinder is provided with an upper furnace mouth cooling cylinder cooling medium cavity, an upper furnace mouth cooling cylinder cooling medium outlet pipe is matched at the upper side part of the upper furnace mouth cooling cylinder, an upper furnace mouth cooling cylinder cooling medium inlet pipe is matched at the lower side part of the upper furnace mouth cooling cylinder, and the upper furnace mouth cooling cylinder cooling medium outlet pipe and the upper furnace mouth cooling cylinder cooling medium inlet pipe are both communicated with the upper furnace mouth cooling cylinder cooling medium cavity and are connected with the cooling medium circulating supply device.
In another specific embodiment of the present invention, said upper tuyere cooling cylinder cooling medium outlet pipe and said upper tuyere cooling cylinder cooling medium inlet pipe are in a diagonal relationship with each other.
In still another embodiment of the present invention, the optical fiber preform suspension mechanism includes a cooling cylinder sealing cover, a hook, and a suspension beam, the cooling cylinder sealing cover is disposed on the top of the upper furnace mouth cooling cylinder and is in sealing engagement with the top surface of the upper furnace mouth cooling cylinder, the hook is fixed at a central position on an upward facing side of the cooling cylinder sealing cover, and the suspension beam is fixed on a side of the cooling cylinder sealing cover facing the cavity of the upper furnace mouth cooling cylinder.
In a further specific embodiment of the invention, a sealing ring groove is formed at the edge part of one side of the cooling cylinder sealing cover facing the upper furnace mouth cooling cylinder cavity and surrounds the circumferential direction of the cooling cylinder sealing cover, a sealing ring is embedded in the sealing ring groove, and the sealing ring is in sealing fit with the top surface of the upper furnace mouth cooling cylinder cavity; one end of the suspension beam is provided with an optical fiber precast rod neck abdicating groove.
In still another embodiment of the present invention, the lower furnace mouth cooling cylinder has a lower furnace mouth cooling cylinder cooling medium cavity, a lower furnace mouth cooling cylinder cooling medium outlet pipe is connected to the upper side part of the lower furnace mouth cooling cylinder, a lower furnace mouth cooling cylinder cooling medium inlet pipe is connected to the lower side part of the lower furnace mouth cooling cylinder, and the lower furnace mouth cooling cylinder cooling medium outlet pipe and the lower furnace mouth cooling cylinder cooling medium inlet pipe are both communicated with the lower furnace mouth cooling cylinder cooling medium cavity and are connected with the cooling medium circulation supply device.
In a more specific embodiment of the present invention, the lower tuyere cooling cylinder cooling medium outlet pipe and the lower tuyere cooling cylinder cooling medium inlet pipe are in a diagonal relationship with each other.
In a further specific embodiment of the present invention, a door mounting frame is formed at a side portion of the lower throat cooling cylinder and at a position corresponding to the observation operation door, a latch is provided at one side of the door mounting frame in a height direction thereof, the observation operation door is pivotally coupled to the other side of the door mounting frame in the height direction and a latch holder is fixed at a position of the observation operation door corresponding to the latch, the latch is engaged with the latch holder, a door sealing gasket is provided around a side of the observation operation door facing the door mounting frame, the door sealing gasket is sealingly engaged with a side of the door mounting frame facing the observation operation door, and a transparent window is provided at a middle region of the observation operation door.
In yet another specific embodiment of the present invention, the evacuation mechanism includes a first evacuation pipe section, an evacuation motor, an evacuation pump, a filter and a second evacuation pipe section, one end of the first evacuation pipe section is connected to the lower side of the lower furnace mouth cooling cylinder and is communicated with the lower furnace mouth cooling cylinder cavity, the other end of the first evacuation pipe section is formed with a first flange, flange fixing screws are arranged at intervals on the peripheral edge of the first flange, a pressure sensor and a pressure relief valve are respectively arranged in the middle of the first evacuation pipe section, the evacuation motor is in transmission fit with the evacuation pump and the evacuation motor is arranged on the traveling base together with the evacuation pump, an air inlet pipe of the evacuation pump is connected to an air outlet of the filter, an air outlet pipe of the evacuation pump is communicated with the outside, the filter is associated with the evacuation pump and supported on the traveling base, one end of the second evacuation pipe section is formed with a second flange, the flange fixing screws are fixedly connected to the second flange, the other end of the second evacuation pipe section is connected to an air inlet of the filter, and a vacuum solenoid valve is connected to the middle of the second evacuation pipe section.
In yet another specific embodiment of the present invention, the traveling wheel is disposed at the bottom of the traveling base, the flange sealing gasket and the filter screen are disposed between the first flange and the second flange, and the filter screen is disposed between the first flange and the flange sealing gasket.
The technical scheme provided by the invention has the following technical effects: because the side part of the lower furnace mouth cooling cylinder is matched with the vacuumizing mechanism, the vacuumizing mechanism vacuumizes the heating cavity of the optical fiber perform, thereby being beneficial to protecting the graphite heating body and avoiding the pollution of impurities in air entering the furnace from the outside at high temperature on the surface of the optical fiber perform; because protective gas is not needed, the processing cost of the optical fiber preform rod conical head can be reduced, and the furnace body structure can be obviously simplified; the protection gas is not used, so that the stability of the temperature in the furnace can be obviously improved, and the quality of the size of the conical head of the optical fiber preform can be ensured; because the cut quartz lump can enter the quartz lump collecting barrel, the environment of an operation place can be improved, and the safety of online operators can be guaranteed.
Drawings
FIG. 1 is a schematic diagram illustrating an embodiment and an application of the present invention.
Detailed Description
In order to clearly understand the technical spirit and the advantages of the present invention, the applicant below describes in detail by way of example, but the description of the example is not intended to limit the technical scope of the present invention, and any equivalent changes made according to the present inventive concept, which are merely in form and not in material, should be considered as the technical scope of the present invention.
Referring to fig. 1, there is shown a furnace body 1 (also referred to as a furnace shell), in which a graphite heater 11 is provided in the furnace body 1, an optical fiber preform heating chamber 111 is formed at the center of the graphite heater 11 in the height direction, the upper portion of the optical fiber preform heating chamber 111 is configured as an upper furnace mouth 12 of the furnace body 1, and the lower portion thereof is configured as a lower furnace mouth 13 of the furnace body 1.
The technical key points of the technical scheme provided by the invention are as follows: an upper furnace mouth cooling cylinder 2 is arranged at the upper part of the furnace body 1 and at the position corresponding to the upper furnace mouth 12 preferably by welding, an upper furnace mouth cooling cylinder cavity 21 of the upper furnace mouth cooling cylinder 2 corresponds to the upper furnace mouth 12 and is communicated with the optical fiber perform heating cavity 111, an optical fiber perform suspension mechanism 3 is arranged at the top part of the upper furnace mouth cooling cylinder 2, and the optical fiber perform suspension mechanism 3 is matched with the top part of the upper furnace mouth cooling cylinder 2 in a sealing way; a lower furnace mouth cooling cylinder 4 is disposed at the lower part of the furnace body 1 and at a position corresponding to the aforementioned lower furnace mouth 13, a lower furnace mouth cooling cylinder chamber 41 of the lower furnace mouth cooling cylinder 4 corresponds to the lower furnace mouth 13 and also communicates with the optical fiber preform heating chamber 111, an observation operation door 5 and a vacuum pumping mechanism 6 for pumping vacuum to the aforementioned optical fiber preform heating chamber 111 are provided at the side of the lower furnace mouth cooling cylinder 4, and a silica lump collecting barrel 7 is provided at the bottom of the lower furnace mouth cooling cylinder 4.
Continuing to refer to fig. 1, the aforementioned upper furnace mouth cooling cylinder 2 has an upper furnace mouth cooling cylinder cooling medium cavity 22, an upper furnace mouth cooling cylinder cooling medium outlet pipe 23 is connected to the upper side portion of the upper furnace mouth cooling cylinder 2, an upper furnace mouth cooling cylinder cooling medium inlet pipe 24 is connected to the lower side portion of the upper furnace mouth cooling cylinder 2, and the upper furnace mouth cooling cylinder cooling medium outlet pipe 23 and the upper furnace mouth cooling cylinder cooling medium inlet pipe 24 are both communicated with the upper furnace mouth cooling cylinder cooling medium cavity 22 and connected with a cooling medium circulation supply device.
As shown in fig. 1, the aforementioned upper throat cooling cylinder cooling medium outlet pipe 23 and the aforementioned upper throat cooling cylinder cooling medium inlet pipe 24 are in a diagonal relationship with each other.
Continuing with fig. 1, a preferred, but not absolutely limited, configuration of the aforementioned optical fiber preform suspension mechanism 3 is as follows: comprises a cooling cylinder sealing cover 31, a hook 32 and a hanging beam 33, wherein the cooling cylinder sealing cover 31 is placed at the top of the upper furnace mouth cooling cylinder 2 and is in sealing fit with the top surface of the upper furnace mouth cooling cylinder 2, the hook 32 is fixed at the central position of the upward side of the cooling cylinder sealing cover 31 in a threaded connection manner, and the hanging beam 33 is fixed at the side (namely, the downward side) of the cooling cylinder sealing cover 31 facing the upper furnace mouth cooling cylinder cavity 21.
As shown in fig. 1, a sealing ring groove 311 is formed at an edge portion of the cooling cylinder sealing cover 31 facing the upper furnace mouth cooling cylinder cavity 21 and around a circumferential direction of the cooling cylinder sealing cover 31, a sealing ring 3111 is embedded in the sealing ring groove 311, and the sealing ring 3111 is in sealing engagement with a top surface of the upper furnace mouth cooling cylinder cavity 21; an optical fiber preform neck escape groove 331 is formed at one end of the suspension beam 33.
Continuing with fig. 1, the aforementioned lower furnace mouth cooling cylinder 4 has a lower furnace mouth cooling cylinder cooling medium cavity 42, a lower furnace mouth cooling cylinder cooling medium outlet pipe 43 is connected to the upper side portion of the lower furnace mouth cooling cylinder 4, and a lower furnace mouth cooling cylinder cooling medium inlet pipe 44 is connected to the lower side portion of the lower furnace mouth cooling cylinder 4, and the lower furnace mouth cooling cylinder cooling medium outlet pipe 43 and the lower furnace mouth cooling cylinder cooling medium inlet pipe 44 are both communicated with the lower furnace mouth cooling cylinder cooling medium cavity 42 and are connected with a cooling medium circulation supply device.
As shown in fig. 1, the aforementioned lower tuyere cooling cylinder cooling medium lead-out pipe 43 and the aforementioned lower tuyere cooling cylinder cooling medium lead-in pipe 44 are in a diagonal relationship with each other.
The cooling medium is water, and the cooling medium circulation supply device preferably employs a circulation pump.
A door mounting frame 45 is formed at a side portion of the aforementioned lower furnace mouth cooling cylinder 4 and at a position corresponding to the aforementioned observation operation door 5, a latch 451 is provided at one side of the door mounting frame 45 in the height direction of the door mounting frame 45, the aforementioned observation operation door 5 is pivotally connected (by a hinge or a pin) to the other side of the height direction of the door mounting frame 45 and a latch holder 51 is fixed at a position of the observation operation door 5 corresponding to the aforementioned latch 451, the latch 451 is engaged with the latch holder 51, a door seal gasket 52 is provided around one side of the observation operation door 5 facing the door mounting frame 45, the door seal gasket 52 is sealingly engaged with the door mounting frame 45 at the side facing the observation operation door 5, and a transparent window 53 is provided at a middle region of the observation operation door 5.
Continuing to refer to fig. 1, the aforementioned vacuum pumping mechanism 6 includes a first vacuum pumping pipe section 61, a vacuum pumping motor 62, a vacuum pumping pump 63, a filter 64 and a second vacuum pumping pipe section 65, one end of the first vacuum pumping pipe section 61 is connected to the lower side of the aforementioned lower furnace mouth cooling cylinder 4 and is communicated with the aforementioned lower furnace mouth cooling cylinder cavity 41, the other end of the first vacuum pumping pipe section 61 is formed with a first flange 611, flange fixing screws 6111 are arranged at intervals at the peripheral edge of the first flange 611, a pressure sensor 612 and a pressure relief valve 613 are respectively arranged at the middle part of the first vacuum pumping pipe section 61, the vacuum pumping motor 62 is in transmission fit with the vacuum pumping pump 63 and is arranged on a walking seat 633 by the vacuum pumping pump 63 together with the vacuum pumping motor 62, the vacuum pumping pump 631 of the vacuum pumping pump 63 is connected to the filter outlet of the filter 64, the vacuum pumping pump outlet pipe 632 of the vacuum pumping pump 63 is communicated with the outside, the filter 64 is accompanied with the vacuum pumping pump 63 and is supported on the walking seat 633, one end of the second vacuum pumping pipe section 65 is formed with a second flange fixing flange 641, the flange fixing screw 6111 is connected to the middle part of the second vacuum pumping nut 642, and the vacuum pumping pipe section is connected to the vacuum pumping nut 642, and is connected to the vacuum pumping nut 64, and is connected to the vacuum pumping pipe section 64, and is connected to the second vacuum pumping pipe section 64, and is connected to the vacuum pumping nut 642.
As shown in fig. 1, the traveling wheel 6331 is disposed at the bottom of the traveling base 633, a flange sealing gasket 66 and a filter screen 67 are disposed between the first and second flanges 611 and 651, and the filter screen 67 is disposed between the first flange 611 and the flange sealing gasket 66.
The applicant described the use of the present invention in conjunction with fig. 1, and moved the optical fiber preform suspension mechanism 3 away from the position of the optical fiber preform 8 shown in the drawing by the on-line operator, and aligned the preform neck 81 of the optical fiber preform 8 with the aforementioned optical fiber preform neck escape groove 331, and supported the preform bulb 82 located at the upper portion of the preform neck 81 in the cavity of the suspension beam 33. The optical fiber preform 8 is introduced from the upper opening of the upper furnace opening cooling cylinder cavity 21 of the upper furnace opening cooling cylinder 2 by the lifting hook of the lifting tool and the lifting hook 32. At this time, the cooling cylinder sealing cover 31 is in sealing engagement with the top surface of the upper furnace mouth cooling cylinder 2 by the aforementioned sealing ring 3111, and due to the gravity of the optical fiber preform 8, the sealing ring 3111 can exhibit an excellent sealing effect with the top surface of the upper furnace mouth cooling cylinder 2. In this state and as shown in fig. 1, about the upper half of the optical fiber preform 8 is located in the upper furnace mouth cooling cylinder chamber 21, and the lower half is located in the aforementioned optical fiber preform heating chamber 111. The on-line operator closes the observation operation door 8, the vacuum-pumping motor 62 of the vacuum-pumping mechanism 6 operates to drive the vacuum-pumping pump 63, and the air in the upper and lower furnace mouth cooling cylinder cavities 21 and 41 and the optical fiber perform heating cavity 111 is pumped out by the vacuum-pumping pump 63, specifically, the air sequentially passes through the pumping port 46, the first vacuum-pumping pipe section 61 (the pressure release valve 613 is in a closed state), the filter screen 67, the second vacuum-pumping pipe section 65 (the electromagnetic valve 652 is in an open state), the filter air inlet 642, the filter air outlet 641, the vacuum-pumping pump air inlet pipe 631 and the vacuum-pumping pump 63 which are arranged on the lower side portion of the lower furnace mouth cooling cylinder 4 until being exhausted to the outside from the vacuum-pumping pump air outlet 632. The degree of evacuation is revealed by a pressure sensor 612 (also called a pressure gauge), which is designed to be between 50 and 150mbar according to the present invention.
In the above state, the graphite heating body 11 is electrically heated, and the cooling medium (water) in the upper and lower throat cooling cylinder cooling medium chambers 22 and 42 is circulated and refluxed. When the temperature reaches 1600-2000 ℃ in the heated state of the graphite heating body 11, the lower part of the optical fiber preform 8 is melted to form a streamline cone head 83, and a quartz lump 84 generated in the forming process of the cone head 83 is also connected to the lower part of the cone head 83, which is observed by the on-line operator through the transparent window 53. Then, the graphite heating body 11 stops heating, the pressure release valve 613 is opened after about 20-50min, meanwhile, when the indication value of the pressure sensor 612 is observed to be zero, the locking relation between the lock catch 451 and the lock catch seat 51 is released, the observation operation door 5 is opened, the quartz lump 84 (also called as a "stub") is cut off in a manual operation mode, and the cut quartz lump 84 automatically falls into the quartz lump collecting barrel 7 and is cleared when the quartz lump is accumulated to a certain amount. Then, the cooling cylinder sealing cover 31 and the optical fiber preform 8 in the suspended state are lifted away from the device by a lifting tool and a lifting hook 32.
In conclusion, the technical scheme provided by the invention overcomes the defects in the prior art, successfully completes the invention task and truly realizes the technical effects of the applicant in the technical effect column.
Claims (10)
1. An optical fiber perform conical head processing device comprises a furnace body (1), wherein a graphite heating body (11) is arranged in the furnace body (1), an optical fiber perform heating cavity (111) is formed in the center of the height direction of the graphite heating body (11), the upper part of the optical fiber perform heating cavity (111) is formed as an upper furnace mouth (12) of the furnace body (1), and the lower part of the optical fiber perform heating cavity is formed as a lower furnace mouth (13) of the furnace body (1), the device is characterized in that an upper furnace mouth cooling cylinder (2) is arranged at the upper part of the furnace body (1) and at the position corresponding to the upper furnace mouth (12), an upper furnace mouth cooling cylinder cavity (21) of the upper furnace mouth cooling cylinder (2) corresponds to the upper furnace mouth (12) and is communicated with the optical fiber perform heating cavity (111), an optical fiber perform suspension mechanism (3) is arranged at the top of the upper furnace mouth cooling cylinder (2), and the optical fiber perform suspension mechanism (3) is matched with the top of the upper furnace mouth cooling cylinder (2) in a sealing way; a lower furnace mouth cooling cylinder (4) is arranged at the lower part of the furnace body (1) and at the position corresponding to the lower furnace mouth (13), a lower furnace mouth cooling cylinder cavity (41) of the lower furnace mouth cooling cylinder (4) corresponds to the lower furnace mouth (13) and is also communicated with the optical fiber preform heating cavity (111), an observation operation door (5) and a vacuumizing mechanism (6) used for vacuumizing the optical fiber preform heating cavity (111) are arranged at the side surface of the lower furnace mouth cooling cylinder (4), and a quartz lump collecting barrel (7) is arranged at the bottom of the lower furnace mouth cooling cylinder (4).
2. The apparatus for processing the taper head of an optical fiber preform according to claim 1, wherein the upper furnace mouth cooling cylinder (2) has an upper furnace mouth cooling cylinder cooling medium chamber (22), an upper furnace mouth cooling cylinder cooling medium outlet pipe (23) is coupled to an upper side portion of the upper furnace mouth cooling cylinder (2), an upper furnace mouth cooling cylinder cooling medium inlet pipe (24) is coupled to a lower side portion of the upper furnace mouth cooling cylinder (2), and the upper furnace mouth cooling cylinder cooling medium outlet pipe (23) and the upper furnace mouth cooling cylinder cooling medium inlet pipe (24) are both communicated with the upper furnace mouth cooling cylinder cooling medium chamber (22) and are connected to a cooling medium circulation supply means.
3. The apparatus for processing the taper head of an optical fiber preform according to claim 2, wherein said upper tuyere cooling cylinder cooling medium take-off pipe (23) and said upper tuyere cooling cylinder cooling medium take-in pipe (24) are in a diagonal relationship with each other.
4. The apparatus for processing the taper head of an optical fiber preform according to claim 1, wherein the suspension mechanism (3) comprises a sealing cap (31) for the cooling cylinder, a hook (32) and a suspension beam (33), the sealing cap (31) for the cooling cylinder is disposed on the top of the cooling cylinder (2) and is in sealing engagement with the top surface of the cooling cylinder (2), the hook (32) is fixed at a central position of an upward facing side of the sealing cap (31) for the cooling cylinder, and the suspension beam (33) is fixed at a side of the sealing cap (31) for the cooling cylinder facing the cooling cylinder chamber (21) of the upper furnace.
5. The apparatus for processing the tapered end of an optical fiber preform according to claim 4, wherein a sealing ring groove (311) is formed at an edge portion of the sealing cover (31) of the cooling cylinder on a side facing the cooling cylinder cavity (21) of the upper furnace mouth and around a circumferential direction of the sealing cover (31) of the cooling cylinder, a sealing ring (3111) is embedded in the sealing ring groove (311), and the sealing ring (3111) is in sealing engagement with the top surface of the cooling cylinder cavity (21) of the upper furnace mouth; one end of the suspension beam (33) is provided with an optical fiber preform neck abdicating groove (331).
6. The apparatus for processing the tapered end of an optical fiber preform according to claim 1, wherein the lower furnace mouth cooling cylinder (4) has a lower furnace mouth cooling cylinder cooling medium chamber (42), a lower furnace mouth cooling cylinder cooling medium outlet pipe (43) is connected to an upper side portion of the lower furnace mouth cooling cylinder (4), and a lower furnace mouth cooling cylinder cooling medium inlet pipe (44) is connected to a lower side portion of the lower furnace mouth cooling cylinder (4), and the lower furnace mouth cooling cylinder cooling medium outlet pipe (43) and the lower furnace mouth cooling cylinder cooling medium inlet pipe (44) are both communicated with the lower furnace mouth cooling cylinder cooling medium chamber (42) and connected to a cooling medium circulation supply device.
7. The apparatus for processing the taper head of an optical fiber preform according to claim 6, wherein said lower tuyere cooling cylinder cooling medium take-off pipe (43) and said lower tuyere cooling cylinder cooling medium take-in pipe (44) are in a diagonal relationship with each other.
8. The apparatus for processing the tapered end of an optical fiber preform according to claim 1, wherein a door mounting frame (45) is formed at a side portion of the lower furnace entrance cooling cylinder (4) and at a position corresponding to the observation operation door (5), a latch (451) is provided at one side of the door mounting frame (45) in a height direction, the observation operation door (5) is pivotally connected to the other side of the door mounting frame (45) in the height direction, and a latch holder (51) is fixed at the observation operation door (5) in a position corresponding to the latch (451), the latch (451) is engaged with the latch holder (51), a door sealing gasket (52) is provided around a side of the observation operation door (5) facing the door mounting frame (45), the door sealing gasket (52) is mounted to be in sealing engagement with the side of the door frame (45) facing the observation operation door (5), and a transparent window (53) is provided at a central region of the observation operation door (5).
9. The apparatus for processing the taper head of an optical fiber preform according to claim 1, wherein the evacuation mechanism (6) comprises a first evacuation tube section (61), an evacuation motor (62), an evacuation pump (63), a filter (64), and a second evacuation tube section (65), one end of the first evacuation tube section (61) is connected to the lower side of the lower furnace mouth cooling cylinder (4) and is communicated with the lower furnace mouth cooling cylinder cavity (41), the other end of the first evacuation tube section (61) is formed with a first flange (611), flange fixing screws (6111) are arranged at intervals around the peripheral edge of the first flange (611), a pressure sensor (612) and a pressure relief valve (613) are respectively arranged at the middle part of the first evacuation tube section (61), the evacuation motor (62) is in transmission fit with the evacuation pump (63) and is arranged on the traveling base (633) by the evacuation pump (63) together with the evacuation motor (62), the vacuum pump (63) and the evacuation pump (63) are connected to the air inlet tube (631), the filter (63) is connected to the exhaust port (64), and the second evacuation mechanism (632) is supported on the traveling base (633) by the second evacuation tube section (65), the flange fixing screw (6111) is fixedly connected with the second flange (651), the other end of the second vacuumizing pipe section (65) is connected with a filter air inlet (642) of a filter (64), and the middle of the second vacuumizing pipe section (65) is provided with an electromagnetic valve (652).
10. The apparatus for processing the taper head of an optical fiber preform according to claim 9, wherein a walking wheel (6331) is provided at the bottom of the walking base (633), a flange sealing gasket (66) and a filtering net (67) are provided between the first and second flanges (611, 651), and the filtering net (67) is located between the first flange (611) and the flange sealing gasket (66).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611114512.6A CN106746585B (en) | 2016-12-07 | 2016-12-07 | Optical fiber perform conical head processingequipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611114512.6A CN106746585B (en) | 2016-12-07 | 2016-12-07 | Optical fiber perform conical head processingequipment |
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| CN107235624A (en) * | 2017-07-25 | 2017-10-10 | 江苏亨通光纤科技有限公司 | Preform vacuum-pumping density seal apparatus and its vacuum-pumping density encapsulation method |
| CN108716459B (en) * | 2018-04-24 | 2020-10-09 | 烽火通信科技股份有限公司 | Adjusting device for adjusting negative pressure of machine head |
| CN109516687A (en) * | 2018-12-28 | 2019-03-26 | 江苏通鼎光棒有限公司 | A kind of optical fiber preform bar stretching furnace and its drawing process |
| CN110746110A (en) * | 2019-12-10 | 2020-02-04 | 普天线缆集团有限公司 | Improved 1550 low loss optical fiber manufacturing apparatus and method of operation |
| CN112159094A (en) * | 2020-05-14 | 2021-01-01 | 江苏永鼎光纤科技有限公司 | Automatic processing method for optical fiber preform taper head |
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