CN111943501B - A method for vertical automatic drawing of optical fiber without damage - Google Patents

Abstract

The invention discloses a method for non-destructive vertical automatic drawing of optical fibers, which comprises the steps that first and second electric fingers are respectively positioned at the top ends of respective strokes when the method is started, a first transmission sliding table is accelerated downwards and starts the first electric finger to clamp an optical fiber wire when the method is started, the first electric finger releases a clamping jaw when the first transmission sliding table runs to a terminal point, meanwhile, a second transmission sliding table is accelerated downwards and starts the second electric finger to clamp the optical fiber wire to draw the optical fiber wire downwards, and at the moment, the first transmission sliding table moves to the top end of a sliding guide rail quickly; when the second electric finger runs to the end point of the wire drawing length L, the second electric finger is loosened, the first transmission sliding table is started to run downwards in an accelerated mode and start the first electric finger to automatically draw wires, and then the second transmission sliding table starts to move quickly to the top end of the stroke to wait for the next action to be repeated. The invention reduces the surface contact and the skin layer damage of the optical fiber wire by a nondestructive automatic wire drawing method, and improves the surface quality and the wire diameter stability of the optical fiber wire drawing.

Description

A method for vertical automatic drawing of optical fiber without damage

technical field

The invention relates to the technical field of optical fiber manufacturing and processing, in particular to a non-damaging vertical automatic drawing method for optical fibers.

Background technique

Optical fiber imaging components, including optical fiber panels, optical fiber inverters, optical fiber cones, optical fiber imaging bundles, and microchannel plates, are photoelectric imaging components with excellent performance, with simple structure, small size, and light weight. , high resolution, large numerical aperture, small inter-stage coupling loss, clear and true image transmission, high light transmission efficiency, optical zero thickness in image transmission, and improved edge image quality. Optical fiber image transmission components are widely used in various cathode ray tubes, camera tubes, charge-coupled device (CCD, Charge-coupled Device) couplings, medical device display screens and high-speed High-definition television imaging and other instruments and equipment that need to transmit images are high-tech cutting-edge products in the optoelectronics industry in this century.

The optical fiber image transmission element is made by matching and combining high-refractive-index glass rods and low-refractive-index glass tubes. After being softened by heating at high temperature in a heating furnace, it is made by single-filament drawing, primary multi-filament drawing, and secondary multi-filament drawing. Optical fiber filaments with a unit fiber diameter less than 6 μm, and then tens of thousands of optical fibers with a unit fiber diameter less than 6 μm are closely packed and arranged, then hot-melted and pressed, and then twisted or drawn. Rigid fiber optic image transmission components that can transmit images.

Each optical fiber in the optical fiber imaging component has good optical insulation, so each optical fiber can transmit light and image independently without being affected by other adjacent optical fibers. Optical fiber image transmission components are mainly used in cathode ray tubes, camera tubes, image intensifiers and other instruments and equipment that need to transmit images, so the requirements for product manufacturing technology are extremely high, especially the drawing process of optical fiber filaments. The key process in the preparation process of such products is to heat and soften the matched optical fiber drawing preform in the drawing furnace at high temperature, then sag by gravity, and then use the drawing and pulling device of the optical fiber filament to soften the sagging optical fiber After the wire is clamped, it is pulled down at a constant speed. The different optical fiber drawing process determines the different wire diameters of optical fiber products, and the drawing process of optical fiber determines the optical fiber wire diameter size, verticality, optical fiber surface quality, twist and so on of optical fiber products. Quality indicators such as silk degree and ellipticity, the drawing mechanism of optical fiber is the key equipment and device in the process of drawing optical fiber. The stability of the device and the accuracy of drawing are directly related to the dimensional stability and diameter of the optical fiber. Consistency of surface quality. Especially for the preparation of optical fiber filaments of rigid optical fiber image transmission components, it needs to go through the processes of single filament drawing, primary multifilament drawing and secondary multifilament drawing. Especially the secondary multifilament, which is drawn from a master rod composed of multiple monofilaments, and then arranged and then drawn. Its surface is formed by combining many optical fibers. Serrated surface, after multiple composite arrangements and drawing, the number of serrated teeth on the surface of the optical fiber doubles with the number of arrangements, and the thickness of the cortex of the secondary multifilament is getting thinner and thinner. Touching and friction will cause damage to the optical fiber cortex, resulting in "light leakage" of the optical fiber, causing "spots" or "grid" defects inside the prepared optical fiber image transmission component, which greatly reduces the optical fiber transmission. Such as the production quality of components and product qualification rate.

The wire drawing system is an important control system in the optical fiber drawing process, including many aspects. The stability and accuracy of the system are directly related to the performance indicators and pass rate of the optical fiber. At present, the pulling device of the optical fiber drawing machine is mainly in two ways: wheel pulling or holding. Wheel pulling mainly relies on the rotational friction of the rubber drawing wheel to achieve the drawing of the optical fiber filament. During the drawing process, the optical fiber and the rubber surface of the drawing wheel are in full contact with the friction force to produce a pull-down effect. Due to friction The contact process causes the surface of the optical fiber to be easily damaged. When the drawing temperature is high, it is easy to burn the surface of the rubber drawing wheel, which will cause impurities or foreign matter pollution on the surface of the optical fiber and reduce the surface quality of the optical fiber. ; When the drawing temperature is low, the optical fiber is easily slipped with the rubber drawing wheel so that normal drawing cannot be achieved, or the surface of the optical fiber will be cortical and glass-abrased. The way of pulling is mainly to rely on the rubber pad on the timing belt to clamp and draw the optical fiber, which is also very prone to slippage of the optical fiber or twisting or drawing of the optical fiber during the drawing process. Due to problems such as uneven diameter, it is often necessary to manually intervene in the entire drawing process, which makes the surface of the optical fiber very prone to damage, adhesion of colloidal particles, impurities, or deterioration of the perpendicularity and concentricity of the drawn optical fiber. As a result, the drawing quality of the optical fiber filaments is reduced, causing spots to appear inside the prepared optical fiber image transmission element, and the entire product is likely to be scrapped.

Contents of the invention

In order to solve the deficiencies in the prior art, the present invention provides a non-damaging vertical automatic drawing method for optical fibers which improves the surface quality of optical fiber filaments and reduces surface defects of optical fiber filaments.

The technical solution adopted by the present invention to solve its technical problems is:

A method for non-damaging vertical automatic drawing of optical fibers, characterized in that it comprises the following steps:

Initial preparation: the first electric finger is at the top of the stroke of the upper half of the sliding guide rail, and the second electric finger is at the top of the stroke of the lower half of the sliding guide rail. The sliding guide rail is divided into the upper half and the lower half by the limit block, wherein, The first electric finger and the second electric finger are in an open state; the drawing master bar material head that manually draws the optical fiber wire to be drawn passes through the first electric finger and the second electric finger in turn, and is positioned by the laser before the drawing operation The drawn optical fiber required for device adjustment and positioning is at the center of the two electric fingers;

Step 1: Start the first transmission slide connected to the first electric finger. The first transmission slide accelerates downward on the upper half of the sliding guide rail. When the first transmission slide reaches the set wire drawing speed V, start The first electric finger clamps the optical fiber, and the first electric finger starts to draw the wire automatically downward at a constant speed according to the set drawing speed V, and the second electric finger stands still and waits;

Step 2: When the first electric finger runs to the end position of the set drawing length L, start the second transmission slide connected to the second electric finger at the same time and start to accelerate downward in the lower half of the sliding guide rail. When the second transmission slide reaches the set drawing speed V, start the second electric finger to clamp the optical fiber and start drawing downwards automatically at a constant speed at the set drawing speed V, and when the second electric finger clamps the optical fiber At the same time, the first electric finger releases the gripper and opens the electric finger;

Step 3: While the second electric finger clamps the optical fiber and automatically draws it downward at a constant speed, the first transmission slide table connected to the first electric finger begins to move upward on the upper half of the sliding guide rail, and quickly moves to the bottom of the sliding guide rail. top, waiting for the next action;

Step 4: When the second electric finger runs to the end point of the set drawing length L, start the first transmission slide connected to the first electric finger at the same time and start to accelerate downward;

Step 5: When the speed of the first transmission slide reaches the set drawing speed V, start the first electric finger to clamp the optical fiber, and start drawing at a constant speed automatically at the set drawing speed V, and at the same time, the second electric finger releases The optical fiber is in a state of opening, and then the second transmission slide starts to move upward on the lower half of the sliding guide rail, quickly moves to the lower end of the limit block, and waits for the next action;

Repeat action: Repeat the action from the first step to the fifth step.

The drawing speed V is 20-70mm per second.

The drawing speed V is 50 mm per second.

The drawing distance L is 400-800mm.

The drawing distance L is 600mm.

Further, the ellipticity of the drawn optical fiber is less than 2.0 μm, the diameter of the drawn optical fiber is 0.5-3.5 mm, and the tolerance of the drawn wire diameter is less than ±5.0 μm.

The sliding guide rail is one guide rail, and the length of the sliding guide rail is 1200-2000mm.

The length of the sliding guide rail is 1600mm.

Further, when the required length of the optical fiber is reached, an automatic cutter is used to cut the optical fiber.

Compared with prior art, the beneficial effect of the present invention is:

In the present invention, the splint of the electric finger touches the optical fiber to carry out uniform-speed and stable traction and drawing, so that the drawing process of the optical fiber is more stable, and the phenomenon of twisting and slipping in the drawing process does not occur, and the ellipticity of the twisting is less than 2.0 μm , The wire diameter tolerance is less than ±5.0μm, which reduces the surface contact and skin wear of the optical fiber wire during the drawing process, improves the surface quality of the optical fiber wire drawing and the stability of the wire diameter of the optical fiber wire.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that need to be used in the description of the embodiments or the prior art will be further introduced below. Apparently, the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to these drawings without creative efforts. Throughout the drawings, similar elements or parts are generally identified by similar reference numerals, and in the drawings, each element or part is not necessarily drawn to scale.

Fig. 1 is a schematic structural view of an optical fiber non-damaging vertical automatic wire drawing mechanism provided by the present invention;

Fig. 2 is a schematic view of the front structure of an optical fiber non-damaging vertical automatic drawing mechanism provided by the present invention.

Fig. 3 is a flowchart of a non-damaging vertical automatic drawing method for optical fibers provided by the present invention.

In the picture:

1 sliding guide rail, 2 the first transmission slide, 3 the second transmission slide, 4 the first servo motor, 5 the second servo motor, 6 the first electric finger, 7 the second electric finger, 8 backplane bracket, 9 fiber drawing Tower, 10 limit blocks.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Referring to Figures 1 and 2, a non-damaging vertical automatic wire drawing mechanism for optical fibers includes a sliding guide rail 1 arranged parallel to the wire drawing direction;

The sliding guide rail 1 is provided with a first transmission slide 2, and the slide guide below the first transmission slide 2 is provided with a second transmission slide 3;

The upper part of the sliding guide rail 1 is provided with a first servo motor 4, and the first servo motor 4 is connected to the first transmission slide 2 for realizing the rise and fall of the first transmission slide 2;

The lower part of the sliding guide rail 1 is provided with a second servo motor 5, and the second servo motor 5 is connected to the second transmission slide 3 for realizing the rising and falling of the second transmission slide 3;

The first transmission slide 2 is connected with a first electric finger 6, and a first micro servo motor is installed on the first electric finger 6 for opening and closing of the first electric finger 6;

The second transmission slide 3 is connected with a second electric finger 7 , and a second micro servo motor is installed on the second electric finger 7 for opening and closing of the second electric finger 7 .

In the present invention, the upper and lower electric fingers alternately clamp the optical fiber for traction and drawing, so that the drawing action of the optical fiber is smooth, the repeat positioning accuracy is high, and the surface contact and cortex damage of the optical fiber during the drawing process are reduced. , improve the surface quality of the optical fiber wire drawing and the stability of the wire diameter.

In this embodiment, on the basis of the above embodiments, the first servo motor 4 and the second servo motor 5 are respectively connected to an intelligent program control system, and the intelligent program control system is used to control the first transmission slide 2 and the second transmission slide 3 respectively. running speed and running distance.

In this embodiment, on the basis of the above-mentioned embodiments, the first micro servo motor and the second micro servo motor are respectively connected to an intelligent program control system, and the intelligent program control system is used to control the opening and closing of the first electric finger 6 and the second electric finger 7 respectively. combine.

The invention adopts an intelligent program control system, and the intelligent program control adopts touch screen control, which can set the parameters of the control system, compensate and correct, etc.; ensures the precise operation of complex movements in the wire drawing process, and abandons the disadvantages of traditional PLC single-chip microcomputers that only have a single signal; can It is more convenient and precise to adjust the movement speed of moving parts, and has the advantages of stable movement and small speed deviation.

Further, it also includes a laser positioning device;

The laser positioning device is arranged at the bottom of the sliding guide rail, and the laser of the laser positioning device is coaxial with the center of the first electric finger, the center of the second electric finger and the female rod of the optical fiber filament to be drawn;

The laser positioning device is used for precise positioning of the concentricity of the drawing wire when adjusting and replacing the optical fiber female rod.

The first electric finger 6 and the second electric finger 7 both have a parallel splint structure, and the parallel splints of the parallel splint structure are used for vertically pulling and drawing the optical fiber after clamping it.

One end of the electric finger of the present invention is a parallel splint structure, which can be easily disassembled and replaced; the electric finger is driven by a micro motor, which abandons the traditional compressed air drive; Traction and pulling, the electric finger moves gently, and the repeat positioning accuracy is high;

Preferably, rubber sheets are provided on the inner surfaces of the parallel splints.

The material of the rubber sheet is carbon black-free rubber, preferably nitrile rubber; the thickness of the rubber sheet is 0.5-5.0 mm.

The role of the rubber sheet is to increase the frictional resistance of the wire drawing, so that the splint does not slip when drawing the optical fiber during the wire drawing process;

Further, it also includes a backplane support 8, on which the sliding guide rail 1 is mounted and fixed, and the backplane support 8 can be adjusted away from or close to the optical fiber filament to ensure that the center of the first electric finger 6, The center of the second electric finger 7 is coaxial with the optical fiber filament;

Backplane bracket 8 is made of aluminum alloy to reduce the weight of the entire load-bearing frame;

The backplane bracket 8 can be matched and installed with the fiber drawing tower 9, and can be aligned and adjusted in three dimensions.

Further, it also includes a protective cover and a limit block 10 arranged at the middle position of the sliding guide rail 1;

The sliding guide rail 1 above the restricting device 10 is provided with a first transmission slide 2;

The sliding guide rail 1 below the restricting device 10 is provided with a second transmission slide 3;

The protective cover is installed on the upper part of the sliding guide rail 1 to protect the female bar head or other foreign objects or sundries from falling during wire drawing.

Preferably, a wire diameter tester is provided above the sliding guide rail 1, and an automatic cutter is provided below the sliding guide rail 1;

The wire diameter tester can test the wire diameter change and the ellipticity in at least two directions of the automatically drawn optical fiber;

The automatic cutter can cut the drawn optical fiber filaments to a fixed length.

The method for automatic wire drawing using the optical fiber non-damaging vertical automatic wire drawing mechanism of the present invention will be described below through specific examples

Example 1

Referring to Fig. 3, a method for vertical automatic drawing of optical fibers without damage includes the following steps:

Initial preparation: Both the first electric finger and the second electric finger are at the top of their respective strokes and their openings are at the maximum state; the drawing head of the optical fiber to be drawn is manually pulled through the first electric finger and the second electric finger in turn. Fingers: before the wire drawing operation, the laser positioning device needs to be used to adjust and position the optical fiber wire to be drawn in the center of the two electric fingers;

The first electric finger is at the top of the stroke of the upper half of the sliding guide rail, and the second electric finger is at the top of the stroke of the lower half of the sliding guide rail. The sliding guide rail is divided into the upper half and the lower half by the limit block; the length of the sliding guide rail is 1600mm, The distance from the top of the sliding guide rail to the limiting block is the stroke distance of the first sliding platform, and the distance from the limiting block to the bottom of the sliding guide rail is the stroke distance of the second sliding platform;

The first step: start the first transmission slide connected to the first electric finger, the first transmission slide accelerates downward on the upper half of the sliding guide rail, when the first transmission slide reaches the set wire drawing speed of 50mm/s , start the first electric finger to clamp the optical fiber, and the first electric finger starts to automatically draw downward at a constant speed according to the set drawing speed of 50mm/second, and the second electric finger stands still and waits;

Step 2: When the first electric finger runs to the end position of the set wire drawing length of 600mm, start the second transmission slide connected to the second electric finger at the same time and start to accelerate downward in the lower half of the sliding guide rail. When the second transmission slide reaches the set drawing speed of 50mm/s, start the second electric finger to clamp the optical fiber and start drawing downwards automatically at a constant speed at the set drawing speed of 50mm/s, and when the second electric finger clamps At the same time as the optical fiber, the first electric finger releases the gripper and opens the electric finger to the maximum;

Step 3: While the second electric finger clamps the optical fiber and automatically draws it downward at a constant speed, the first transmission slide table connected to the first electric finger begins to move upward on the upper half of the sliding guide rail, and quickly moves to the bottom of the sliding guide rail. top, waiting for the next action;

Step 4: When the second electric finger runs to the end point of the set drawing length of 600mm, start the first transmission slide connected to the first electric finger at the same time and start to accelerate downward;

Step 5: When the speed of the first transmission slide reaches the set drawing speed of 50mm/s, start the first electric finger to clamp the optical fiber, and start drawing at the set drawing speed V automatically at a constant speed, and at the same time the second electric finger Loosen the optical fiber and open the mouth to the maximum state, then the second transmission slide starts to move upward on the lower half of the sliding guide rail, quickly moves to the lower end of the limit block, and waits for the next action;

Repeat action: Repeat the action from the first step to the fifth step.

When the required length of optical fiber filament is reached, use an automatic cutter to cut the optical fiber filament.

The ellipticity of the drawn optical fiber in this embodiment is less than 2.0 μm, the diameter of the drawn optical fiber is 1.20 mm, and the tolerance of the drawn wire diameter is less than ±5.0 μm.

Example 2

The steps are the same as in Example 1, except that the wire drawing speed V is 70 mm per second, the wire drawing distance L is 800 mm, and the length of the sliding guide rail is 2000 mm.

Example 3

The steps are the same as in Example 1, except that the wire drawing speed V is 20 mm per second, the wire drawing distance L is 400 mm, and the length of the sliding guide rail is 1200 mm.

The invention sets, adjusts and controls the wire drawing speed of the transmission slide, the return speed of the transmission slide, and the wire drawing length of the transmission slide through an intelligent control system; an optical fiber non-damage automatic wire drawing system of the present invention is used for automatic wire drawing, The splint of the electric finger is used to clamp the optical fiber. The splint of the electric finger is in contact with the optical fiber through point contact, forming a point-contact drawing traction method. The transmission slide and the electric finger are not in contact with the optical fiber during the traction process. The contact or touch of other positions of the filament reduces the contact with the optical fiber filament, thereby reducing the occurrence of optical fiber surface defects, so that the optical fiber filament diameter size, optical fiber filament surface quality, verticality, and concentricity during the drawing process The performance indicators such as fiber diameter, ellipticity, etc. are more stable, and there will be no twisting and surface damage of the optical fiber, which ensures the drawing quality of the optical fiber and reduces the damage ratio of the optical fiber during the drawing process. Improved internal finish quality of fiber optic imaging components.

In the wire drawing method of the present invention, a sliding guide rail is used in the same direction, which can better and more effectively control the concentricity of the first transmission slide table and the second transmission slide table and the first electric finger and the second electric finger. The first electric finger and the second electric finger can well realize the vertical drawing of the optical fiber and the butt joint of the drawing during the drawing and drawing process, so that the drawing process of the optical fiber does not deviate.

The embodiments described above are only one of the more preferred specific implementations of the present invention, and the usual changes and replacements performed by those skilled in the art within the scope of the technical solutions of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. A method for vertical automatic drawing of optical fiber without damage is characterized by comprising the following steps:

initial preparation: the first electric finger is positioned at the top end of the stroke of the upper half part of the sliding guide rail, the second electric finger is positioned at the top end of the stroke of the lower half part of the sliding guide rail, the sliding guide rail is divided into the upper half part and the lower half part by a limiting block, and the first electric finger and the second electric finger are in an opening state; manually drawing a drawing mother rod stub bar of the optical fiber wire to be drawn to sequentially pass through a first electric finger and a second electric finger, and adjusting and positioning the optical fiber wire to be drawn to be in the central positions of the two electric fingers through a laser positioning device before the wire drawing operation is prepared;

the first step is as follows: starting a first transmission sliding table connected with a first electric finger, wherein the first transmission sliding table runs downwards at the upper half part of the sliding guide rail in an accelerated manner, when the first transmission sliding table reaches a set wire drawing speed V, starting the first electric finger to clamp the optical fiber wire, the first electric finger starts to automatically draw the wire downwards at a constant speed according to the set wire drawing speed V, and at the moment, a second electric finger stands still for waiting;

the second step is that: when the first electric finger runs to the end position of the set wire drawing length L, the second transmission sliding table connected with the second electric finger is started to run downwards at the lower half part of the sliding guide rail at an accelerated speed, when the second transmission sliding table reaches the set wire drawing speed V, the second electric finger is started to clamp the optical fiber wire to automatically draw the optical fiber wire downwards at a constant speed according to the set wire drawing speed V, and when the second electric finger clamps the optical fiber wire, the first electric finger releases the clamping jaw and opens the electric finger;

the third step: when the second electric finger clamps the optical fiber filaments to automatically draw the optical fiber filaments downwards at a constant speed, the first transmission sliding table connected with the first electric finger starts to move upwards at the upper half part of the sliding guide rail, rapidly moves to the top end of the sliding guide rail and waits for the next action;

the fourth step: when the second electric finger runs to reach the end point of the set wire drawing length L, simultaneously starting a first transmission sliding table connected with the first electric finger to start to downwards accelerate;

the fifth step: when the speed of the first transmission sliding table reaches a set wire drawing speed V, starting a first electric finger to clamp the optical fiber wires, starting automatic uniform wire drawing according to the set wire drawing speed V, simultaneously loosening the optical fiber wires by a second electric finger and opening the optical fiber wires, then starting the second transmission sliding table to move upwards at the lower half part of the sliding guide rail, quickly moving to the lower end of the limiting block, and waiting for the next action;

repeating the actions: repeating the actions of the first step to the fifth step;

the wire drawing speed V is 20-70 mm per second;

the wire drawing distance L is 400-800mm;

the ovality of the drawn optical fiber is less than 2.0 μm, the diameter of the drawn optical fiber is 0.5-3.5 mm, and the tolerance of the diameter of the drawn fiber is less than +/-5.0 μm.

2. The method for non-invasive vertical automatic fiber drawing of optical fibers according to claim 1, wherein the drawing speed V is 50mm per second.

3. The method for non-invasive vertical automatic fiber drawing of optical fibers according to claim 1, wherein the drawing distance L is 600mm.

4. The method for vertical automatic fiber drawing without damage of optical fiber according to claim 1, wherein the sliding guide rail is 1 guide rail, and the length of the sliding guide rail is 1200-2000mm.

5. The method for non-invasive vertical automatic fiber drawing according to claim 4, wherein the length of the sliding guide rail is 1600mm.

6. The method of claim 4, wherein the optical fiber is cut by an automatic cutter when the desired length of the optical fiber is achieved.

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