CN109884744B - Torsion forming device and method for ultra-narrow torsion area optical fiber image inverter - Google Patents
Torsion forming device and method for ultra-narrow torsion area optical fiber image inverter Download PDFInfo
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- CN109884744B CN109884744B CN201910294647.2A CN201910294647A CN109884744B CN 109884744 B CN109884744 B CN 109884744B CN 201910294647 A CN201910294647 A CN 201910294647A CN 109884744 B CN109884744 B CN 109884744B
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Abstract
The invention discloses a torsion forming device and a torsion forming method of an optical fiber image inverter in an ultra-narrow torsion area. The torsion forming method of the invention is to install the blank of the optical fiber board on the torsion forming clamp head, adopt the set temperature programming and heat preservation to torsion form the optical fiber image inverter, and apply a relative driving force to the two end faces of the optical fiber image inverter which is being twisted or has been twisted in the torsion forming process, thereby realizing the compression torsion area. The device can effectively avoid the problems of burst, edge dark point, disappearing edge resolution and reduced transmittance of the optical fiber image reverser caused by the width of the compression torsion area in the torsion forming process of the optical fiber image reverser, and can realize an ultra-narrow torsion area.
Description
Technical Field
The invention relates to the field of production and manufacturing of optical fiber image inversors, in particular to a torsion forming device and a torsion forming method of an ultra-narrow torsion area optical fiber image inverser.
Background
The night vision helmet is suitable for more complex night combat environments, and can be found earlier and seen more clearly, so that all-weather combat targets are achieved, and the night combat capability becomes an important sign for measuring the combat capability of armies in modern high-tech wars. The low-light night vision technology adopted by the night vision helmet is to install the low-light night vision device on the helmet, and is mainly applied to the aspects of pilots, night drivers, infantry combat and the like, and becomes important weaponry for soldiers. The night vision device is arranged on the helmet, so that a pilot can observe the outside under the condition of weak light and provide a wider field of view, and a helicopter driver can fly close to the ground under the condition of low brightness. But mounting the night vision device in front of the driver's standard flight helmet causes the combined center of gravity of the night vision device, helmet and head to shift forward and upward from the normal head center of gravity. The additional weight of the night vision device and the mounting bracket connected with the night vision device and the offset of the gravity center caused by the additional weight are an additional burden to a driver, the driver can feel tired in normal flight, the neck of the driver can be injured in sudden maneuvering flight, some systems are provided with a balance object or a battery of the night vision device at the rear part of the helmet, partial gravity center offset can be corrected, but the total weight borne by the head can be increased, the head movement in the helmet is limited, and the potential observation range of the driver is greatly reduced. The night vision helmet has become an important factor affecting the health and flight safety of pilots due to the problems of overlarge mass, unstable center of gravity, increased outline, limited noise immunity, large temperature load, poor comfort and the like. When the flight helmet is worn for a long time, the problems of large head and neck load, high heat load, hearing decline, visual damage, increased psychological load and the like are easily generated, the flight fatigue degree is increased, the pilot operation level can be directly influenced when the flight fatigue degree is serious, the flight safety is threatened, and particularly, after the flight helmet is worn for a long time, the phenomena of neck pain, hearing loss, large heat load, poor comfortableness and the like are easily generated, so that the flight fatigue of the pilot is increased, the pilot operation coordination is reduced, the action force is unstable, the flight action is difficult to be completed skillfully and accurately, and the occurrence rate of human factor errors is obviously increased.
In order to keep the advantages of the night vision technology and meet the overall requirements of soldiers in armies for high-mobility operations, the night vision helmet is continuously developed in the directions of miniaturization, light weight and integration, and aims to reduce the volume and the mass, enable the projection amount of an objective lens eyepiece to be small, enable the center of gravity to be closer to the face, increase the visual field and increase the visibility, so that the night vision helmet is more suitable for being worn for a long time. The optical fiber image inverter is a core optical component in the helmet night vision device, in order to meet the development requirements of miniaturization, light weight, resolution and imaging definition of the helmet night vision device, the purpose of reducing the overall quality and volume of the helmet night vision device is always expected to be achieved by reducing the height, volume and weight of the optical fiber image inverter, if the quality of the optical fiber image inverter can be reduced by 30%, the overall quality of related structures, components, battery structures and the like matched with the low-light night vision device can be reduced by more than 50%, the flexibility and mobility requirements of soldier combat use can be greatly met, and the night combat capability of individual soldiers is improved.
However, the optical fiber image inverter manufactured by the traditional method torsion forming device has wide torsion area, large diameter, large volume and heavy mass, and can not be manufactured into an ultra-narrow torsion area optical fiber image inverter.
Disclosure of Invention
The invention provides a torsion forming method capable of realizing an ultra-narrow torsion region optical fiber image inverter and a torsion forming device capable of realizing the ultra-narrow torsion region optical fiber image inverter, aiming at solving the defect of higher manufacturing cost in the prior art.
The technical scheme adopted for solving the technical problems is as follows:
the utility model provides a twist reverse device of district optic fibre of turning round of super narrow, includes twists reverse shaping dop and heating furnace, the heating furnace includes the passageway, the passageway periphery is equipped with interior stove heating system, interior stove heating system is equipped with the heat preservation outward, twists reverse shaping dop and is used for installing the blank, the blank is located in the passageway, interior stove heating system is used for making the blank evenly heated.
The heat preservation sets up the both sides of interior stove heating system, and the heat preservation symmetry setting of both sides.
The width of one side of the heat preservation layer is 40-60mm and/or the width of the internal furnace heating system is 8-15mm.
The periphery of the heat preservation layer is provided with a furnace shell, and one side of the heat preservation layer, which is close to the channel, is provided with an auxiliary heating system.
The thickness of the heat preservation layer is 50-80mm.
The inner furnace heating system comprises a heating furnace wire and a ceramic support arranged on the heating furnace wire, and a gap surrounding the blank is formed in the ceramic support.
The width of the gap is 3-7mm, and the distance between the gap and the blank is 1.5-3mm.
The upper part of the inner furnace heating system is provided with a thermocouple, the heat preservation layer is a ceramic fiber heat preservation layer, and the blank is an optical fiber plate blank.
Further, the rotary torsion forming device also comprises a thrust system and a rotary torsion forming system, wherein the thrust system is used for applying opposite thrust to the two end faces of the blank; the heating furnace is arranged on the rotary torsion forming system.
The invention also provides a torsion forming method by using the torsion forming device, which comprises the following steps:
(1) Heating the blank: the optical fiber plate blank is arranged on the torsion forming clamping head and is arranged in the middle of the torsion forming heating furnace; starting an inner furnace heating system and simultaneously starting a synchronous rotating system to enable the blank of the optical fiber plate to rotate in the inner furnace heating system to be heated uniformly, and raising the torsion forming heating furnace to the torsion forming temperature of 620-780 ℃ from room temperature for 60-120 minutes;
(2) And (5) torsion forming: after the temperature is raised to the torsion forming temperature, preserving heat, and gradually realizing differential torsion forming in the preserving heat process, wherein the whole torsion forming process needs 10-30 minutes;
(3) Compression torsion region: during or after the torsion molding process of the optical fiber image reverser, applying a relative thrust of 8-20 kg weight to the two end surfaces of the optical fiber image reverser which are being or have been subjected to torsion molding through a thrust system;
(4) Cooling: and after the optical fiber image inverter reaches a torsion forming angle of 180 degrees, ending the heating and rotating process, naturally cooling the torsion formed optical fiber image inverter in a torsion forming furnace, taking out the torsion forming furnace after the temperature of the torsion forming furnace is reduced to below 200 ℃, and placing the torsion forming furnace in a heat preservation box for further cooling.
The device can effectively avoid the problems of burst, edge dark point, disappearing edge resolution and reduced transmittance of the optical fiber image reverser caused by the width of the compression torsion area in the torsion forming process of the optical fiber image reverser, can realize an ultra-narrow torsion area, and has light weight.
Drawings
FIG. 1 is a schematic diagram of a torsion forming device of an optical fiber image inverter with ultra-narrow torsion area according to an embodiment of the present invention;
fig. 2 is a graph showing a torsion area width and torsion angle distribution diagram of an ultra-narrow torsion area optical fiber inverter and a comparison result of the torsion area width and torsion angle distribution diagram with a torsion area width and torsion angle distribution diagram of a normal optical fiber inverter according to an embodiment of the present invention.
In the figure:
1-blank;
2-heating furnace, 20-channel, 21-internal furnace heating system, 22-furnace shell and 23-ceramic bracket;
3-an insulating layer;
4-twisting and forming a clamping head;
5-thermocouple.
In fig. 2: a is a normal optical fiber image inverter; and b is an ultra-narrow torsion area optical fiber image inverter.
Detailed Description
The invention is further described below with reference to the accompanying drawings, which are not intended to limit the invention.
Referring to fig. 1, a torsion forming device of an optical fiber image inverter with an ultra-narrow torsion area comprises a torsion forming clamping head 4 and a heating furnace 2, wherein the heating furnace 2 comprises a channel 20, an inner furnace heating system 21 is arranged on the periphery of the channel 20, an insulating layer 3 is arranged outside the inner furnace heating system 21, the torsion forming clamping head 4 is used for mounting a blank 1, the blank 1 is positioned in the channel 20, and the inner furnace heating system 21 is used for uniformly heating the blank 1.
The optical fiber image inverter with the ultra-narrow torsion area is an optical fiber image inverter with a torsion forming compression torsion area on a limited blank length, so that the middle area of a heating furnace needs to have enough heat to soften a heating area of the blank, and the high-temperature area of the middle area is uniformly distributed as much as possible, so that the width angles of the torsion area after compression are uniformly distributed as much as possible, namely the stretching deformation area of the optical fiber is uniformly distributed. The periphery of the channel is provided with a circle of inner furnace heating system, so that the heating uniformity is ensured, and the blank can be softened in a heating area by arranging the heating quantity of the inner furnace heating system. The heat preservation layer is arranged to ensure that the optical fiber image inverter does not burst due to uneven heat distribution in the areas except the high-temperature heated area. The inner furnace heating system arranged in the torsion forming heating furnace is independently heated, and the outer furnace heat preservation layer is arranged in the heating process, so that the heating furnace and the heat preservation layer can ensure that the two ends and the middle of the torsion forming ultra-narrow torsion region optical fiber image reverser blank form a temperature difference so as to compress the torsion region width, and the temperature difference cannot be too large, thereby ensuring that the torsion optical fiber image reverser blank is not burst in the torsion forming process and the cooling process after torsion forming.
Preferably, the heat preservation layers 3 are arranged on two sides of the inner furnace heating system 21, so that the inner furnace heating system 21 is convenient to install and overhaul while heat preservation is achieved, and the heat preservation layers 3 on two sides of the inner furnace heating system 21 are symmetrically arranged, so that consistency and uniformity of temperatures on two sides of a blank are guaranteed. In order to ensure that the blank has a temperature difference between its ends and the middle so as to compress the width of the torsion zone, the width of the insulating layer 3 on one side is preferably 40-60mm, preferably 50mm, and/or the width of the internal furnace heating system 21 is 8-15mm, preferably 10mm.
Preferably, the periphery of the heat preservation layer 3 is provided with a furnace shell 22, and one side of the heat preservation layer 3 close to the channel is provided with an auxiliary heating system.
When the heating temperature of the internal furnace heating system is insufficient, the auxiliary heating system can be used for supplementing heat to the blank.
In this embodiment, based on the above embodiment, the thickness of the insulation layer 3 is 50-80mm.
The thickness of the heat preservation layer is smaller than 50mm, so that heat can be dissipated too quickly, and the temperature difference between the two sides and the middle of the blank of the optical fiber plate is too large, so that the end face of the optical fiber plate is cracked; the heat preservation layer is larger than 80mm, so that the temperature difference between the two sides and the middle of the blank of the optical fiber plate is too small, heat cannot be dissipated, the width of a torsion region is not easy to compress, the end face is even deformed, the width of the torsion region is widened, and the thickness of the heat preservation layer 3 is 50-80mm, preferably 60mm, so that the formation of the ultra-narrow torsion region of the optical fiber image inverter can be effectively ensured.
In this embodiment, on the basis of the above embodiment, the inner furnace heating system 21 includes a heating furnace wire and a ceramic bracket 23 provided on the heating furnace wire, and a slit surrounding the blank 1 is provided on the ceramic bracket 23.
The heating furnace wire is a main part of an inner furnace heating system, and the inner furnace heating system can ensure enough heat energy to soften a blank heating area and also can lead the width of a torsion area to be widened as much as possible in a middle high-temperature area so as to homogenize the distribution of torsion angles of the optical fiber image inverter. Through setting up ceramic support, play the effect of fixed heating furnace silk to make furnace silk not sagged or subside, through setting up the gap, guaranteed the heat of radiation on the fiber board blank.
Preferably, the width of the gap is 3-7mm, preferably 5.0mm, the gap is too small, heat of the heating furnace wire cannot radiate, the furnace wire can be damaged, the service life is shortened, and the gap is too large, so that the heat can be completely radiated on the surface of the blank of the optical fiber plate, and the purpose of compressing the torsion area can not be achieved; the distance between the slit and the optical fiber plate blank 1 is 1.5-3mm, preferably 2.0mm, and is too large, so that the heat radiated on the optical fiber plate blank can not reach the torsion forming temperature, and the distance is too small, which is not beneficial to the optical fiber plate blank to enter and exit the torsion forming inner furnace.
The distance between the gap and the blank is determined so as to better achieve the effects of softening and uniform heating.
Preferably, for testing the temperature, the upper part of the inner furnace heating system 2 is provided with a thermocouple 5.
In this embodiment, based on the above embodiment, the heat insulation layer 3 is a ceramic fiber heat insulation layer, and the blank 1 is a fiber board blank.
The furnace shell of the torsion-molded heating furnace is separated by the light ceramic fiber heat-insulating layer material, and the ceramic fiber is used as the heat-insulating layer material, so that the heat-insulating performance is good, the weight of the whole heating furnace can be reduced, and the installation and the disassembly are convenient.
Further, the rotary torsion forming device also comprises a thrust system and a rotary torsion forming system, wherein the thrust system is used for applying opposite thrust to the two end faces of the blank; the heating furnace is arranged on the rotary torsion forming system.
The middle part of the heating furnace is provided with a high-temperature area, the high-temperature area is an inner furnace heating system, two sides of the heating furnace are symmetrically provided with ceramic fiber heat preservation layers, a thermocouple directly penetrates through the upper part of the inner furnace heating system from the top of the heating furnace, and the thermocouple is not in direct contact with the inner furnace heating system. The internal furnace heating system, the heat preservation layer and the rotary torsion forming machine are matched, the torsion forming heating furnace is arranged on the rotary torsion forming machine, the rotary torsion forming machine adopts special equipment for processing an ultra-narrow torsion area optical fiber image reverser product, and the structure of the rotary torsion forming machine is identical or similar to that of a common optical fiber image reverser torsion forming machine, and the rotary torsion forming machine is not repeated herein.
The ultra-narrow torsion area optical fiber image inverter blank to be torsion-molded is arranged on the torsion rod clamp head and is placed in the middle of a high-temperature heating system of the torsion molding furnace at high temperature.
The invention also provides a torsion forming method by using the torsion forming device, which comprises the following steps:
(1) Heating the blank: the optical fiber plate blank with the diameter smaller than phi 27mm and the length smaller than 27mm is arranged on the torsion forming clamping head and is arranged in the middle of the torsion forming heating furnace; starting an inner furnace heating system and simultaneously starting a synchronous rotating system to enable the optical fiber plate blank to rotate in the inner furnace heating system and be heated uniformly, and raising the torsion forming heating furnace to the torsion forming temperature of 620-780 ℃ from room temperature for 60-120 minutes, wherein if the torsion forming temperature is higher than 780 ℃, the phenomenon of light leakage caused by skin cracking can occur to the edge fiber of the optical fiber plate blank because of too high temperature, the torsion forming temperature cannot be lower than 620 ℃, otherwise, the optical fiber plate blank cannot reach the torsion forming temperature, and torsion forming cannot be realized;
(2) And (5) torsion forming: after the temperature is raised to the torsion forming temperature, preserving heat, and gradually realizing differential torsion forming in the preserving heat process, wherein the whole torsion forming process needs 10-30 minutes;
(3) Compression torsion region: during or after the torsion molding process of the optical fiber image reverser, applying a relative thrust of 8-20 kg weight to the two end surfaces of the optical fiber image reverser which are being or have been subjected to torsion molding through a thrust system; the thrust is determined by the distance between the compression torsion areas, the thrust given by the small range of the compression torsion areas is larger, but the thrust cannot exceed 20 kg, otherwise, the fiber is broken, and the thrust cannot be smaller than 8 kg, otherwise, the compression of the torsion areas cannot be realized;
(4) Cooling: and after the optical fiber image inverter reaches a torsion forming angle of 180 degrees, ending the heating and rotating process, naturally cooling the torsion formed optical fiber image inverter in a torsion forming furnace, taking out the torsion forming furnace after the temperature of the torsion forming furnace is reduced to below 200 ℃, and placing the torsion forming furnace in a heat preservation box for further cooling.
The torsion forming method of the present invention is further described by the following specific examples:
example 1
The hexagonal blank of the optical fiber plate with the diameter phi of 27mm and the length of 27mm is arranged on a torsion forming clamp head and is placed in the middle of a torsion forming heating furnace, a set temperature programming is adopted, the temperature programming system is increased to 500 ℃ for 30 minutes, the temperature is increased to 620 ℃ for 30 minutes, and the temperature is kept for 80 minutes after the temperature is increased to the torsion forming temperature; starting the synchronous rotation system while starting the inner furnace heating system, enabling the blank of the optical fiber plate to rotate in the inner furnace heating system to be heated uniformly, performing torsion molding of the optical fiber image inverter at the torsion molding temperature, and preserving heat after the temperature rises to the torsion molding temperature of 620 ℃; the differential torsion forming is gradually realized in the heat preservation process, 30 minutes are needed in the whole torsion forming process, the opposite 20 kg weight thrust is applied to the two end faces of the optical fiber image reverser which is being twisted or is already twisted through a thrust system in the torsion forming process of the optical fiber image reverser, the torsion forming area of the optical fiber image reverser which is being twisted can be compressed under the action of the thrust force, the purpose of compressing the width of the torsion forming area of the optical fiber image reverser is achieved, the heating and rotating process is finished after the optical fiber image reverser reaches the torsion forming angle of 180 degrees, the optical fiber image reverser which is twisted is naturally cooled in a torsion forming furnace, and the optical fiber image reverser which is twisted can be taken out to be placed in a heat preservation box for further cooling after the temperature of the torsion forming furnace is reduced to below 200 ℃. The method and the device have the advantages that the temperature reduction process and the temperature reduction measure do not need to be set, the end face of the optical fiber image inverter can be ensured not to deform due to the heating action of the furnace wire and not to burst due to temperature reduction, the torsion area width of the ultra-narrow torsion area optical fiber image inverter finished product prepared by the method and the device is smaller than 13mm, the height is smaller than 15mm, and the quality is smaller than 20g. Compared with a normal optical fiber image inverter, the prepared optical fiber image inverter finished product with the ultra-narrow torsion area has the advantages of reducing the volume by more than 30 percent and reducing the quality by more than 40 percent.
Example 2
The optical fiber plate blank with the diameter phi of 25mm and the length of 25mm is arranged on a torsion forming clamp head and is placed in the middle of a torsion forming heating furnace, a set temperature programming is adopted, the temperature programming system is that the temperature is increased to 500 ℃ for 60 minutes, the temperature is increased to 780 ℃ for 60 minutes, and the temperature is kept for 60 minutes after the temperature is increased to the torsion forming temperature; the inner furnace heating system is started, the synchronous rotating system is started at the same time, the blank of the optical fiber plate is heated uniformly in the inner furnace heating system, the torsion forming of the optical fiber image reverser is carried out at the torsion forming temperature, the temperature is kept after the temperature is increased to 780 ℃, differential torsion forming is gradually realized in the heat-insulating process, 10 minutes are needed in the whole torsion forming process, the opposite thrust of 8 kg weight is applied to the two end surfaces of the optical fiber image reverser which is in torsion forming or has been in torsion forming through the thrust system during or after the torsion forming of the optical fiber image reverser, the heating and rotating process is finished after the optical fiber image reverser reaches the torsion forming angle of 180 ℃, the optical fiber image reverser subjected to torsion forming is cooled naturally in the torsion forming furnace, and the optical fiber image reverser subjected to torsion forming can be taken out and placed in the heat-insulating box for further cooling after the temperature of the torsion forming furnace is reduced to below 200 ℃. The twist area width of the finished product of the ultra-narrow twist area optical fiber image inverter prepared by the method and the device is less than 13mm, the height is less than 15mm, and the mass is less than 20g. Compared with a normal optical fiber image inverter, the prepared optical fiber image inverter finished product with the ultra-narrow torsion area has the advantages of reducing the volume by more than 30 percent and reducing the quality by more than 40 percent.
Example 3
The optical fiber plate blank with the diameter phi of 26mm and the length of 26mm is arranged on a torsion forming clamp head and is placed in the middle of a torsion forming heating furnace, a set temperature programming is adopted, the temperature programming system is that the temperature is increased to 500 ℃ for 50 minutes, the temperature is increased to 700 ℃ for 50 minutes, and the temperature is kept for 90 minutes after the temperature is increased to the torsion forming temperature; the inner furnace heating system is started, the synchronous rotating system is started at the same time, the blank of the optical fiber plate is heated uniformly in the inner furnace heating system, the torsion forming of the optical fiber image reverser is carried out at the torsion forming temperature, the temperature is kept after the temperature is increased to 700 ℃, differential torsion forming is gradually realized in the heat-insulating process, 15 minutes are needed in the whole torsion forming process, the opposite thrust of 14 kg weight is applied to the two end surfaces of the optical fiber image reverser which is in torsion forming or has been in torsion forming through the thrust system during or after the torsion forming of the optical fiber image reverser, the heating and rotating process is finished after the optical fiber image reverser reaches the torsion forming angle of 180 ℃, the optical fiber image reverser subjected to torsion forming is cooled naturally in the torsion forming furnace, and the optical fiber image reverser subjected to torsion forming can be taken out and placed in the heat-insulating box for further cooling after the temperature of the torsion forming furnace is reduced to below 200 ℃. The twist area width of the finished product of the ultra-narrow twist area optical fiber image inverter prepared by the method and the device is less than 13mm, the height is less than 15mm, and the mass is less than 20g. Compared with a normal optical fiber image inverter, the prepared optical fiber image inverter finished product with the ultra-narrow torsion area has the advantages of reducing the volume by more than 30 percent and reducing the quality by more than 40 percent.
Example 4
The optical fiber plate blank with the diameter phi of 25mm and the length of 27mm is arranged on a torsion forming clamp head and is placed in the middle of a torsion forming heating furnace, a set temperature programming is adopted, the temperature programming system is increased to 500 ℃ for 25 minutes, the temperature is increased to 750 ℃ for 35 minutes, and the temperature is kept for 60 minutes after the temperature is increased to the torsion forming temperature; the inner furnace heating system is started, the synchronous rotating system is started at the same time, the blank of the optical fiber plate is heated uniformly in the inner furnace heating system, the optical fiber image reverser is subjected to torsion forming at the torsion forming temperature, the temperature is kept after the temperature is increased to 750 ℃ for torsion forming, differential torsion forming is gradually realized in the heat-insulating process, 18 minutes are needed in the whole torsion forming process, the opposite 12 kg weight thrust is applied to the two end surfaces of the optical fiber image reverser which is subjected to torsion forming or has been subjected to torsion forming through the thrust system in the torsion forming process or after the torsion forming process of the optical fiber image reverser, the heating and rotating process is finished after the optical fiber image reverser reaches the torsion forming angle of 180 ℃, the torsion forming optical fiber image reverser is subjected to natural cooling in the torsion forming furnace, and the optical fiber image reverser can be taken out for further cooling after the temperature of the torsion forming furnace is reduced to below 200 ℃. The twist area width of the finished product of the ultra-narrow twist area optical fiber image inverter prepared by the method and the device is less than 13mm, the height is less than 15mm, and the mass is less than 20g. Compared with a normal optical fiber image inverter, the prepared optical fiber image inverter finished product with the ultra-narrow torsion area has the advantages of reducing the volume by more than 30 percent and reducing the quality by more than 40 percent.
Referring to fig. 2, fig. 2 is a graph of twist width and twist angle profile of an ultra-narrow twist section optical fiber inverter and a twist width and twist angle profile of a normal optical fiber inverter; it can be seen from the figure that the twist zone width of the normal fiber optic inverter is greater than 16mm, while the twist zone width of the ultra-narrow twist zone fiber optic inverter is less than 13mm.
The optical fiber image inverter with the ultra-narrow torsion area has the advantages of small height, small volume, light weight, convenience in integration and the like because the width of the torsion area is small, the resolution and the image transmission definition are the same as those of a normal image inverter, and the optical fiber image inverter with the ultra-narrow torsion area can remarkably reduce the volume and the weight of a helmet night vision device and becomes an ideal component of the helmet night vision device.
The above embodiment is only one of the preferred embodiments of the present invention, and the ordinary changes and substitutions made by those skilled in the art within the scope of the present invention should be included in the scope of the present invention.
Claims (10)
1. A torsion molding method of a torsion molding device utilizing an ultra-narrow torsion area optical fiber image inverter is characterized by comprising the following steps:
(1) Heating the blank: the optical fiber plate blank is arranged on the torsion forming clamping head and is arranged in the middle of the torsion forming heating furnace; starting an inner furnace heating system, and simultaneously starting a synchronous rotating system to uniformly heat the blank of the optical fiber plate in the inner furnace heating system by rotating, and raising the torsion forming heating furnace to the torsion forming temperature of 620-780 ℃ from room temperature for 60-120 minutes;
(2) And (5) torsion forming: after the temperature is raised to the torsion forming temperature, preserving heat, and gradually realizing differential torsion forming in the preserving heat process, wherein the whole torsion forming process needs 10-30 minutes;
(3) Compression torsion region: during or after the torsion molding process of the optical fiber image reverser, applying a relative thrust of 8-20 kg weight to the two end surfaces of the optical fiber image reverser which are being or have been subjected to torsion molding through a thrust system;
(4) Cooling: after the optical fiber image inverter reaches a torsion forming angle of 180 degrees, finishing the heating and rotating process, naturally cooling the torsion formed optical fiber image inverter in a torsion forming furnace, taking out the optical fiber image inverter after the temperature of the torsion forming furnace is reduced to below 200 ℃, and placing the optical fiber image inverter in a heat preservation box for further cooling;
the torsion forming device of the ultra-narrow torsion area optical fiber image reverser comprises a torsion forming clamping head and a heating furnace, wherein the heating furnace comprises a channel, an inner furnace heating system is arranged on the periphery of the channel, an insulating layer is arranged outside the inner furnace heating system, the torsion forming clamping head is used for installing a blank, the blank is positioned in the channel, and the inner furnace heating system is used for enabling the blank to be heated uniformly.
2. The torsion forming method according to claim 1, wherein the heat insulating layers are provided on both sides of the inner furnace heating system, and the heat insulating layers on both sides are symmetrically provided.
3. The torsion forming method according to claim 2, wherein the width of the insulating layer on one side is 40-60mm and/or the width of the inner furnace heating system is 8-15mm.
4. A torsion forming method according to claim 3, wherein the outer periphery of the heat-insulating layer is provided with a furnace shell, and an auxiliary heating system is arranged on one side of the heat-insulating layer close to the channel.
5. The torsion forming method according to any one of claims 1 to 4, wherein the thickness of the heat insulating layer is 50 to 80mm.
6. The torsion forming method according to claim 5, wherein the inner furnace heating system includes a heating furnace wire and a ceramic bracket provided on the heating furnace wire, and a slit is provided on the ceramic bracket around the periphery of the blank.
7. The twist-forming method of claim 6, wherein the gap has a width of 3-7mm and the gap is spaced from the blank by a distance of 1.5-3mm.
8. The torsion forming method according to claim 7, wherein a thermocouple is provided at an upper portion of the inner furnace heating system; the heat preservation is a ceramic fiber heat preservation, and the blank is an optical fiber plate blank.
9. The twist-forming method of claim 8, further comprising a thrust system for applying opposing thrust forces to the two end surfaces of the blank and a rotary twist-forming system; the heating furnace is arranged on the rotary torsion forming system.
10. The torsion forming device of the optical fiber image reverser in the ultra-narrow torsion area is characterized by comprising a torsion forming clamping head and a heating furnace, wherein the heating furnace comprises a channel, an inner furnace heating system is arranged at the periphery of the channel, an insulating layer is arranged outside the inner furnace heating system, the torsion forming clamping head is used for mounting a blank, the blank is positioned in the channel, and the inner furnace heating system is used for uniformly heating the blank;
the rotary torsion forming system is used for applying opposite thrust to the two end faces of the blank; the heating furnace is arranged on the rotary torsion forming system.
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| CN110568550B (en) * | 2019-09-24 | 2020-10-09 | 广州宏晟光电科技股份有限公司 | Shape forming method of optical fiber image inverter |
| CN112645587A (en) * | 2020-12-07 | 2021-04-13 | 中国建筑材料科学研究总院有限公司 | Optical fiber taper and processing device and processing method thereof |
| CN115385568B (en) * | 2022-09-09 | 2023-09-12 | 中国建筑材料科学研究总院有限公司 | Twisting method and twisting device for optical fiber, large-caliber optical fiber image inverter and preparation method |
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