Furnace mouth air isolation system and automatically-controlled high-temperature rod replacement method

Abstract

The invention belongs to the technical field of optical fiber preparation, and particularly relates to a furnace mouth air isolation system and an automatically-controlled high-temperature rod replacement method. The furnace mouth air isolation system comprises a closing device, a sensing device and a driving device, the closing device is arranged at a furnace mouth of the furnace body and comprises a plurality of membranes, the membranes are sequentially stacked to form an inscribed circle, and the diameter of the inscribed circle is changed by changing the plane included angle between the membranes; the sensing device is arranged on the peripheral side of the closing device and is used for sensing the distance between the preform and the closing device and the diameter of the preform; the driving device is in communication connection with the closing device and the sensing device, and the driving device is arranged on the peripheral side of the closing device and can drive the multiple diaphragms to change the plane included angle between the diaphragms so as to change the diameter of the inscribed circle. The sensing device can sense the diameter change of the preform, so that the diameter of the inscribed circle is changed, the diameter of the preform is the same as that of the inscribed circle, air is prevented from entering the furnace body, and the service life of the graphite piece is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of optical fiber preparation, and in particular to a furnace mouth air isolation system and an automatically controlled high-temperature rod changing method. Background Art

[0002] With the rise of big data, the Internet of Things, cloud computing and 5G, the growing demand for information has put forward higher requirements on the attenuation and cost of optical fiber communication systems. Attenuation refers to the phenomenon that when the optical signal is transmitted in the optical fiber, its power gradually decreases as the transmission distance increases. The national standard attenuation standard of optical fiber in the 1310nm window is less than 0.36dB per kilometer. In the process of optical fiber drawing, the 1310nm attenuation of the optical fiber often accounts for a large part of the overall attenuation loss. In addition to the normal optical rod, the factors determined by the 1310nm attenuation will also have a great impact on the wire drawing process. In the wire drawing process, in addition to the state of the graphite parts in the furnace itself, the mixing of air during high-temperature production change is also a major factor affecting the attenuation.

[0003] In the prior art, a quartz cover is often used to isolate the furnace environment from the external environment during production change. However, it is not possible to isolate the furnace from the outside world when lifting and feeding the rods. Since the feeding speed of the rod body is slow and cannot be accelerated, the rod body is in contact with the outside world for a long time, which can easily cause oxidation of the graphite parts, resulting in a reduction in the service life of the graphite parts and an increase in the 1310nm attenuation during the optical fiber drawing process. Summary of the invention

[0004] The purpose of the present invention is to provide a furnace mouth air isolation system and an automatically controlled high-temperature rod changing method to solve the problem in the prior art that the rod cannot be isolated from the outside world when lifting and feeding the rod. Since the feeding speed of the rod body is slow and it is impossible to speed up, the contact time with the outside world is long, which easily causes oxidation of the graphite parts, resulting in a decrease in the service life of the graphite parts and an increase in the 1310nm attenuation during the optical fiber drawing process. The service life of the graphite parts is increased and the 1310nm attenuation during the optical fiber drawing process is reduced.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] In one aspect, a furnace mouth air isolation system is provided, comprising:

[0007] A closing device, a sensing device and a driving device, wherein the closing device is arranged at the furnace mouth of the furnace body, the closing device comprises a plurality of diaphragms, the plurality of diaphragms are stacked in sequence to form an inscribed circle, and the plane angles between the plurality of diaphragms are changed to change the diameter of the inscribed circle; the sensing device is arranged at the peripheral side of the closing device, and is used to sense the distance between the preform rod and the closing device and the diameter of the preform rod; the driving device is communicatively connected with both the closing device and the sensing device, the driving device is arranged at the peripheral side of the closing device and can drive the plurality of diaphragms to change the plane angles between them to change the diameter of the inscribed circle.

[0008] As an optional technical solution for the furnace mouth air isolation system, the closing device also includes a first fixed ring, a second fixed ring and a rotating ring. The rotating ring is clamped between the first fixed ring and the second fixed ring and can rotate relative to the first fixed ring and the second fixed ring. One end of the diaphragm is arranged on the rotating ring, and the other end is rotatably arranged on the first fixed ring or the second fixed ring. The rotation of the rotating ring can drive all the diaphragms to rotate together, thereby changing the plane angle between the multiple diaphragms to change the diameter of the inscribed circle.

[0009] As an optional technical solution for the furnace mouth air isolation system, slide grooves are provided on both sides of the rotating ring, and sliders are provided on the first fixed ring and the second fixed ring. The slide grooves and the sliders cooperate with each other to enable relative rotation between the rotating ring and the first fixed ring and the second fixed ring.

[0010] As an optional technical solution for the furnace mouth air isolation system, a rotating shaft is provided on the first fixing ring or the second fixing ring, and a rotating hole is provided on the diaphragm. The rotating shaft and the rotating hole cooperate to rotatably set the diaphragm on the first fixing ring or the second fixing ring.

[0011] As an optional technical solution for the furnace mouth air isolation system, a plurality of rotating shafts are evenly spaced apart on the first fixing ring or the second fixing ring.

[0012] As an optional technical solution for the furnace mouth air isolation system, a tooth block is provided on the circumferential side of the rotating ring, and the driving device includes a gear, and the gear is meshed with the tooth block. The rotation of the gear can drive the rotating ring to rotate, thereby driving the multiple diaphragms to change the plane angles between each other to change the diameter of the inscribed circle.

[0013] As an optional technical solution of the furnace mouth air insulation system, the furnace mouth air insulation system also includes a feeding device, and the feeding device includes a driving motor, and the driving motor can drive the preform rod to move towards or away from the furnace mouth.

[0014] As an optional technical solution for the furnace mouth air isolation system, the feeding device also includes a centering adjustment mechanism, which can drive the preform rod to move radially along the furnace mouth so that the center of the preform rod is aligned with the center of the inscribed circle.

[0015] As an optional technical solution of the furnace mouth air insulation system, the furnace mouth air insulation system also includes a cooling device, which is arranged above the closing device and is used to adjust the temperature of the closing device.

[0016] As an optional technical solution of the furnace mouth air isolation system, the furnace mouth air isolation system also includes an oxygen content testing device, and the oxygen content testing device is arranged in the furnace body and is used to test the oxygen content in the furnace body.

[0017] On the other hand, an automatically controlled high-temperature rod replacement method is provided, which is applied to the above-mentioned furnace mouth air isolation system, and is characterized in that it includes the following steps:

[0018] S1, driving the preform rod to move in a direction close to the furnace opening;

[0019] S2, the sensing device monitors the distance between the preform and the furnace mouth in real time;

[0020] S3, when the limit gap between the preform rod and the furnace mouth is reached, the driving device drives the diaphragm to change its angle to form an inscribed circle;

[0021] S4. The sensing device monitors the diameter of the preform rod in real time, so that the preform rod passes through the inscribed circle and abuts against the inner wall of the inscribed circle at all times.

[0022] Beneficial effects of the present invention:

[0023] The present invention provides a furnace mouth air isolation system and an automatically controlled high-temperature rod replacement method, comprising a closing device, a sensing device and a driving device, wherein the closing device is arranged at the furnace mouth of the furnace body, the closing device comprises a plurality of diaphragms, the plurality of diaphragms are stacked in sequence to form an inscribed circle, and the plane angle between the plurality of diaphragms is changed to change the diameter of the inscribed circle; the sensing device is arranged at the peripheral side of the closing device, and is used to sense the distance between the preform rod and the closing device and the diameter of the preform rod; the driving device is communicatively connected with the closing device and the sensing device, and the driving device is arranged at the peripheral side of the closing device and can drive the plurality of diaphragms to change the plane angle between each other to change the diameter of the inscribed circle. The sensing device can identify the change in the diameter of the preform rod, thereby controlling the change in the diameter of the inscribed circle, making the diameter of the preform rod coincide with the diameter of the inscribed circle, avoiding air from entering the furnace body, increasing the service life of the graphite parts, and reducing the 1310 attenuation during the optical fiber drawing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0025] Figure 1 is a structural schematic diagram of a furnace mouth air isolation system provided by an embodiment of the present invention;

[0026] Figure 2 This is a partial structural diagram of the furnace mouth air isolation system provided by an embodiment of the present invention. Figure 1 ;

[0027] Figure 3 This is a partial structural diagram of the furnace mouth air isolation system provided by an embodiment of the present invention. Figure 2 ;

[0028] Figure 4 This is a partial structural diagram of the furnace mouth air isolation system provided by an embodiment of the present invention. Figure 3 ;

[0029] Figure 5 It is a flow chart of the automatic controlled high temperature rod changing method provided by an embodiment of the present invention.

[0030] In the figure:

[0031] 100, preform; 200, furnace body;

[0032] 10. Closing device; 11. Diaphragm; 111. Rotation hole; 12. First fixing ring; 121. Rotation shaft; 13. Gear block;

[0033] 20. Sensing device; 21. Filter; 22. CCD detector; 23. Infrared emitting device;

[0034] 30. Driving device; 31. Gear;

[0035] 40. Feeding device;

[0036] 50. Oxygen content testing device. DETAILED DESCRIPTION

[0037] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above drawings.

[0038] In this application, the terms "comprises", "includes", "has" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0039] In this application, the term "and / or" is a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects before and after are in an "and / or" relationship.

[0040] In the present application, the terms "connect", "combine", "couple", and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, direct connection refers to two parts or components being connected together without the need for an intermediate piece, and indirect connection refers to two parts or components being connected to at least one intermediate piece respectively, and the two parts or components being connected via the intermediate piece. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

[0041] In the present application, it will be understood by those of ordinary skill in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerances caused by manufacturing, assembly, and use associated with a specific value, and the like. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0042] In this application, it will be understood by those skilled in the art that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0043] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, the bottom can include directly below, lower left, lower right, lower front, and lower back, etc.

[0044] In the prior art, a quartz cover is often used to isolate the furnace environment from the external environment during production change. However, it is not possible to isolate the furnace from the outside world when lifting and feeding the rods. Since the feeding speed of the rod body is slow and cannot be accelerated, the rod body is in contact with the outside world for a long time, which can easily cause oxidation of the graphite parts, resulting in a reduction in the service life of the graphite parts and an increase in the 1310nm attenuation during the optical fiber drawing process.

[0045] To solve the above problems, see Figure 1-Figure 3 The present embodiment provides a furnace mouth air isolation system, comprising a closing device 10, a sensing device 20 and a driving device 30. The closing device 10 is arranged at the furnace mouth of the furnace body 200. The closing device 10 comprises a plurality of diaphragms 11, and the plurality of diaphragms 11 are stacked in sequence to form an inscribed circle. The plane angle between the plurality of diaphragms 11 is changed to change the diameter of the inscribed circle; the sensing device 20 is arranged on the peripheral side of the closing device 10, and is used to sense the distance between the preform rod 100 and the closing device 10 and the diameter of the preform rod 100; the driving device 30 is communicatively connected with both the closing device 10 and the sensing device 20. The driving device 30 is arranged on the peripheral side of the closing device 10 and can drive the plurality of diaphragms 11 to change the plane angle between them to change the diameter of the inscribed circle. The sensing device 20 can identify the diameter change of the preform rod 100, thereby controlling the change in the diameter of the inscribed circle, so that the diameter of the preform rod 100 and the diameter of the inscribed circle match, avoiding air from entering the furnace body 200, increasing the service life of the graphite parts, and reducing the 1310 attenuation during the optical fiber drawing process.

[0046] Specifically, see Figure 4 The sensing device 20 is configured as an infrared sensing device, including a filter 21, a CCD detector 22 and an infrared emitting device 23. Since the infrared sensing device is a very mature device in the prior art, the specific principle will not be described in detail here.

[0047] Furthermore, the diaphragm 11 is a frosted quartz sheet. The frosted quartz sheet has extremely high high temperature resistance and is suitable for being arranged at the furnace mouth.

[0048] Furthermore, the closing device 10 also includes a first fixed ring 12, a second fixed ring and a rotating ring. The rotating ring is clamped between the first fixed ring 12 and the second fixed ring and can rotate relative to the first fixed ring 12 and the second fixed ring. One end of the diaphragm 11 is arranged on the rotating ring, and the other end is rotatably arranged on the first fixed ring 12 or the second fixed ring. The rotation of the rotating ring can drive all the diaphragms 11 to rotate together, thereby changing the plane angle between the multiple diaphragms 11 to change the diameter of the inscribed circle. The diaphragm 11 rotates with the rotating ring to form inscribed circles of different diameters. The size of the inscribed circle is the same as that of the preform rod 100. When the rod is lifted and fed, the edge of the inscribed circle is close to the peripheral side of the preform rod 100 to isolate air from entering the furnace body 200.

[0049] Specifically, slide grooves are provided on both sides of the rotating ring, and sliders are provided on the first fixed ring 12 and the second fixed ring, and the slide grooves and the sliders cooperate with each other to enable the rotating ring and the first fixed ring 12 and the second fixed ring to rotate relative to each other. In other embodiments, the rotating ring and the first fixed ring 12 and the second fixed ring can also cooperate with each other through pulley rails or ball slide grooves, which will not be described in detail here.

[0050] Furthermore, a rotating shaft 121 is provided on the first fixing ring 12 or the second fixing ring, and a rotating hole 111 is provided on the diaphragm 11 . The rotating shaft 121 cooperates with the rotating hole 111 to rotatably set the diaphragm 11 on the first fixing ring 12 or the second fixing ring.

[0051] Furthermore, a plurality of rotating shafts 121 are evenly spaced on the first fixing ring 12 or the second fixing ring. In this embodiment, the number of diaphragms 11 is the same as the number of rotating shafts 121. The more diaphragms 11 there are, the smoother the edge of the inscribed circle formed by the plurality of diaphragms 11 is, and the better the air isolation effect is.

[0052] Furthermore, a tooth block 13 is provided on the circumference of the rotating ring, and the driving device 30 includes a gear 31. The gear 31 is meshed with the tooth block 13. The rotation of the gear 31 can drive the rotating ring to rotate, thereby driving the multiple diaphragms 11 to change the plane angles between each other to change the diameter of the inscribed circle. In other embodiments, a socket can also be provided on the circumference of the rotating ring, and the driving device 30 can be provided with a plug rod; the plug rod is inserted into the socket, and the driving device 30 drives the plug rod to swing back and forth, thereby driving the rotating ring to rotate, thereby driving the diaphragm 11 to rotate, thereby changing the diameter of the inscribed circle.

[0053] Furthermore, the furnace mouth air isolation system further includes a feeding device 40, which includes a driving motor, and the driving motor can drive the preform 100 to move toward or away from the furnace mouth. Further, the feeding device 40 also includes a centering adjustment mechanism, which can drive the preform 100 to move along the radial direction of the furnace mouth so that the central axis of the preform 100 coincides with the central axis of the inscribed circle.

[0054] Specifically, the feeding device 40 is communicatively connected with the driving device 30, the closing device 10 and the sensing device 20. The feeding device 40 can drive the preform 100 to enter the furnace port and adjust the center through the signal released by the sensing device 20, so that the preform 100 and the diaphragm 11 can be more accurately docked, thereby improving the air isolation effect.

[0055] Furthermore, the furnace mouth air isolation system also includes a cooling device, which is arranged above the closing device 10 and is used to adjust the temperature of the closing device 10. In this embodiment, the cooling device can be set as a water cooling mechanism to exchange heat with the closing device 10 so as to control the temperature of the closing device 10 and prevent the closing device 10 from being unable to operate due to excessively high temperature. Specifically, a pipe is arranged around the closing device 10, cold water or condensing agent is introduced into the pipe, and then the cold water or condensing agent is discharged from the outlet, and the cycle is repeated to cool the closing device 10.

[0056] Furthermore, the furnace mouth air isolation system also includes an oxygen content testing device 50, which is arranged in the furnace body 200 and is used to test the oxygen content in the furnace body 200. Specifically, an air inlet and an air pump are also arranged in the furnace body 200 to introduce oxygen when the oxygen content in the furnace body 200 is too low, so as to avoid combustion failure in the furnace body 200 due to lack of oxygen. It should be noted that since the oxygen content testing device 50 is a relatively mature device in the prior art, the specific structure and testing principle of the oxygen content testing device 50 will not be described one by one here.

[0057] Further, see Figure 5 This embodiment also provides an automatically controlled high-temperature rod replacement method, which is applied to a furnace mouth air isolation system and includes the following steps:

[0058] S1. Drive the preform rod 100 to move in a direction close to the furnace opening.

[0059] S2. The sensing device 20 monitors the distance between the preform rod 100 and the furnace opening in real time.

[0060] S3. When the gap between the preform rod 100 and the furnace mouth reaches the limit, the driving device 30 drives the diaphragm 11 to change its angle to form an inscribed circle.

[0061] S4. The sensing device 20 monitors the diameter of the preform rod 100 in real time, so that the preform rod 100 passes through the inscribed circle and abuts against the inner wall of the inscribed circle at all times.

[0062] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A furnace mouth air isolation system, characterized in that: include: A closing device (10), the closing device (10) being arranged at a furnace opening of a furnace body (200), the closing device (10) comprising a plurality of diaphragms (11), the plurality of diaphragms (11) being stacked in sequence to form an inscribed circle, and the plane angles between the plurality of diaphragms (11) being changed to change the diameter of the inscribed circle; a sensing device (20), the sensing device (20) being arranged on the peripheral side of the closing device (10) and used for sensing the distance between the preform rod (100) and the closing device (10) and the diameter of the preform rod (100); A driving device (30), wherein the driving device (30) is communicatively connected to the closing device (10) and the sensing device (20), and the driving device (30) is arranged on the peripheral side of the closing device (10) and can drive the plurality of diaphragms (11) to change the plane angles between each other, so as to change the diameter of the inscribed circle.

2. The furnace mouth air insulation system according to claim 1, characterized in that: The closing device (10) further comprises a first fixed ring (12), a second fixed ring and a rotating ring; the rotating ring is clamped between the first fixed ring (12) and the second fixed ring and can rotate relative to the first fixed ring (12) and the second fixed ring; one end of the diaphragm (11) is arranged on the rotating ring, and the other end is rotatably arranged on the first fixed ring (12) or the second fixed ring; the rotation of the rotating ring can drive all the diaphragms (11) to rotate together, thereby changing the plane angles between the multiple diaphragms (11) to change the diameter of the inscribed circle.

3. The furnace mouth air insulation system according to claim 2, characterized in that: Slide grooves are arranged on both sides of the rotating ring, and sliding blocks are arranged on the first fixed ring (12) and the second fixed ring. The slide grooves and the sliding blocks cooperate with each other to enable the rotating ring and the first fixed ring (12) and the second fixed ring to rotate relative to each other.

4. The furnace mouth air insulation system according to claim 2, characterized in that: The first fixing ring (12) or the second fixing ring is provided with a rotating shaft (121), and the diaphragm (11) is provided with a rotating hole (111), and the rotating shaft (121) and the rotating hole (111) cooperate to rotatably set the diaphragm (11) on the first fixing ring (12) or the second fixing ring.

5. The furnace mouth air insulation system according to claim 4, characterized in that: A plurality of rotating shafts (121) are evenly spaced apart on the first fixing ring (12) or the second fixing ring.

6. The furnace mouth air insulation system according to claim 2, characterized in that: A tooth block (13) is arranged on the circumferential side of the rotating ring, and the driving device (30) comprises a gear (31). The gear (31) is meshed with the tooth block (13). The rotation of the gear (31) can drive the rotating ring to rotate, thereby driving the plurality of diaphragms (11) to change the plane angles between each other, so as to change the diameter of the inscribed circle.

7. The furnace mouth air insulation system according to any one of claims 1 to 6, characterized in that: The furnace mouth air insulation system further comprises a feeding device (40), wherein the feeding device (40) comprises a driving motor, and the driving motor can drive the preform rod (100) to move towards or away from the furnace mouth.

8. The furnace mouth air insulation system according to claim 7, characterized in that: The feeding device (40) also includes a centering adjustment mechanism, which can drive the preform rod (100) to move radially along the furnace mouth so that the center of the preform rod (100) is aligned with the center of the inscribed circle.

9. The furnace mouth air insulation system according to any one of claims 1 to 6, characterized in that: The furnace mouth air insulation system also includes a cooling device, which is arranged above the closing device (10) and is used to adjust the temperature of the closing device (10).

10. The furnace mouth air insulation system according to any one of claims 1 to 6, characterized in that: The furnace mouth air isolation system further comprises an oxygen content testing device (50), wherein the oxygen content testing device (50) is arranged in the furnace body (200) and is used to test the oxygen content in the furnace body (200).

11. An automatically controlled high temperature rod changing method, applied to the furnace mouth air isolation system according to any one of claims 1 to 10, characterized in that: The following steps are involved: S1, driving the preform rod (100) to move in a direction close to the furnace opening; S2, the sensing device (20) monitors the distance between the preform (100) and the furnace opening in real time; S3, when the limit gap between the preform rod (100) and the furnace mouth is reached, the driving device (30) drives the diaphragm (11) to change its angle to form an inscribed circle; S4. The sensing device (20) monitors the diameter of the preform rod (100) in real time, so that the preform rod (100) passes through the inscribed circle and abuts against the inner wall of the inscribed circle at all times.

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