Automatic glue spraying device for full-automatic optical fiber winding machine and control method of automatic glue spraying device

Abstract

The invention discloses an automatic glue spraying device for a full-automatic optical fiber winding machine and a control method of the automatic glue spraying device. The automatic glue spraying device is characterized by comprising a glue spraying unit, a CCD (Charge Coupled Device) camera and a driving unit, the glue spraying unit comprises a glue storage barrel, a piezoelectric injection valve and a lengthened needle; the driving unit comprises a first linear module, a second linear module and a support. The first linear module is used for driving the bracket to axially move at a uniform speed along the optical fiber ring framework; the second linear module is used for driving the bracket to intermittently move along the radial direction of the optical fiber ring framework; and the glue spraying unit and the CCD camera move along with each other on the bracket. The winding mode that the optical fibers are guided and arranged firstly and then glued can be achieved, the empty glue phenomenon caused by uneven glue carrying is avoided, meanwhile, gaps formed by tangency of the three turns of optical fibers can be filled with glue when the optical fibers are wound, the effective bonding glue amount among the optical fibers is increased, the bonding strength can be greatly improved, the tangent positions are tightly combined, and the service life of the optical fibers is prolonged. And the performance and the stability of the optical fiber ring product are improved.

Description

Technical Field

[0001] The invention relates to an automatic glue spraying device for a full-automatic optical fiber winding machine and a control method thereof. Background Art

[0002] Fiber optic rings are mainly used in the field of inertial navigation. The main customers are military-industrial enterprises and scientific research institutes in the fiber optic gyroscope industry. The downstream corresponds to modern equipment of the military services such as military aircraft, armored vehicles, missiles, etc.; and simultaneously promote the application in the civilian market, mainly including industrial lasers, ocean monitoring, communications and smart grids.

[0003] The fully automatic fiber winding machine is the core equipment for producing polarization-maintaining fiber rings for fiber optic gyroscopes. Its structure includes: a main shaft mechanism for fiber winding, a fiber supply mechanism for providing optical fiber and ensuring that the optical fiber can be smoothly released during the winding process, a tension control mechanism for controlling the optical fiber to maintain appropriate tension during the winding process, a fiber arrangement mechanism for controlling the movement of the optical fiber along a certain trajectory during winding, a glue coating mechanism for optical fiber glue coating, a position monitoring device for real-time monitoring of the winding position and the winding length of the optical fiber, and a control system.

[0004] The glue coating method of the existing fully automatic optical fiber winding machine's glue coating mechanism is to apply glue through the optical fiber glue groove or apply glue with a brush of a glue dispenser (refer to patent documents CN115415100A, CN102241483A, CN115106256A, CN110806202A, etc.), which is a contact method for applying glue to the optical fiber and the glue is applied to the optical fiber before it is wound on the optical fiber ring frame; and because the fiber discharge pressure rod of the fiber discharge mechanism of the fully automatic optical fiber winding machine guides and discharges the optical fiber when the optical fiber is wound (refer to patent documents CN117782048 A, CN110926451A, CN115421237A, etc.), part of the glue on the optical fiber will be scraped away, resulting in uneven glue application and empty glue on the optical fiber ring body (refer to Figure 1 ).

[0005] In addition, when the optical fiber is wound, the amount of effective adhesive between adjacent optical fibers is small, and the bonding force is only generated at the tangent contact points (i.e. 6 scattered points, which are point contact glue). The existing glue spraying method cannot completely fill the large gaps formed between the upper and lower optical fibers (see Figure 1 ), which results in a large number of gaps inside the fiber ring (i.e. the tangent of three turns of fiber), which will affect the fiber ring's ability to resist external interference such as vibration and impact, and in the subsequent use process, it is easy to cause problems such as fiber displacement and loosening, which will affect the performance and stability of the fiber ring product. In the fiber optic gyroscope (the core of which is the fiber ring), a slight change in the position of the fiber may lead to a decrease in measurement accuracy. Summary of the invention

[0006] The present invention provides an automatic glue spraying device for a fully automatic optical fiber winding machine to solve the technical problem that the prior art adopts a contact-type optical fiber glue coating and glue is first applied to the optical fiber before it is wound on the optical fiber ring frame, resulting in uneven glue application during optical fiber winding, causing empty glue in the optical fiber ring body; at the same time, the amount of effective bonding glue between adjacent optical fibers is small, and bonding force is only generated at the tangential contact point, thereby affecting the performance and stability of the optical fiber ring product.

[0007] To achieve the above-mentioned purpose, the present invention provides an automatic glue spraying device for a fully automatic optical fiber winding machine, characterized in that it includes a glue spraying unit, a CCD camera and a driving unit; the glue spraying unit includes a glue storage cylinder, a piezoelectric injection valve and an extension needle, the glue storage cylinder is connected to the glue inlet of the piezoelectric injection valve, the nozzle of the piezoelectric injection valve is externally connected to the extension needle, and the center line of the extension needle intersects vertically with the center line of the optical fiber ring skeleton; the driving unit includes a first linear module, a second linear module and a bracket; the first linear module is connected to the bracket through the second linear module; the first linear module is used to drive the bracket to move at a uniform speed along the axial direction of the optical fiber ring skeleton; the second linear module is used to drive the bracket to intermittently move along the radial direction of the optical fiber ring skeleton; the glue spraying unit and the CCD camera are both arranged on the bracket and move together; the CCD camera is used to obtain real-time image information of the optical fiber ring on the optical fiber ring skeleton and the extension needle of the glue spraying unit and send it to the control system, so that the control system controls the glue spraying unit and the driving unit to perform corresponding actions.

[0008] Furthermore, the length of the extended needle is 20-30 mm.

[0009] Furthermore, the piezoelectric injection valve adopts the MDS 3000 model.

[0010] Furthermore, the CCD camera is installed on the bracket at an angle; the center line of the lens of the CCD camera intersects vertically with the center line of the optical fiber ring skeleton; and the angle K between the center line of the lens of the CCD camera and the center line of the extension needle is 20-30°.

[0011] Furthermore, the glue spraying unit and the CCD camera are both located below the optical fiber ring skeleton.

[0012] The present invention also discloses a control method, which adopts the automatic glue spraying device for a fully automatic optical fiber winding machine described in any of the above technical solutions, and is characterized in that it comprises the following steps: S1, connect the optical fiber on the fiber splitter ring to the fiber ring frame, rotate the fiber ring frame, and wrap around the first layer of the fiber ring first; S2, starting from the second layer, start the first linear module to work and drive the bracket and the glue spraying unit and the CCD camera thereon to move forward along the axial direction of the optical fiber ring skeleton at a uniform speed, and the piezoelectric injection valve dispenses glue at the tangent points of two adjacent turns of optical fiber on the first layer of the optical fiber ring, and the optical fiber is wound along the glue spraying track until the second layer of the optical fiber ring is wound; S3, first drive the bracket and the glue spraying unit and CCD camera thereon to move radially downward along the fiber ring skeleton by a fiber layer spacing H through the second linear module; then start the first linear module to drive the bracket and the glue spraying unit and CCD camera thereon to move axially at a uniform speed in a negative direction, and the piezoelectric injection valve dispenses glue at the tangent points of two adjacent turns of optical fiber on the second layer of the optical fiber ring, and at the same time, the optical fiber is wound along the glue dispensing track until it is wound around the third layer of the optical fiber ring; S4, first drive the bracket and the glue spraying unit and CCD camera thereon to move radially downward along the fiber ring skeleton by a fiber layer spacing H through the second linear module; then start the first linear module to work and drive the bracket and the glue spraying unit and CCD camera thereon to move forward axially at a uniform speed, and the piezoelectric injection valve dispenses glue at the tangent points of two adjacent turns of optical fiber on the third layer of the optical fiber ring, and at the same time, the optical fiber is wound along the glue dispensing track until it is wound around the fourth layer of the optical fiber ring; S5, first drive the bracket and the glue spraying unit and CCD camera thereon to move radially downward along the fiber ring skeleton by a fiber layer spacing H through the second linear module; then start the first linear module to drive the bracket and the glue spraying unit and CCD camera thereon to move axially at a uniform speed in a negative direction, and the piezoelectric injection valve dispenses glue at the tangent points of two adjacent turns of optical fiber on the fourth layer of the optical fiber ring, and at the same time, the optical fiber is wound along the glue dispensing track until it is wound around the fifth layer of the optical fiber ring; S6. Follow the above cycle rule until the last layer of the optical fiber ring is completed.

[0013] Furthermore, the cross-sectional area A of the amount of glue dispensed by the piezoelectric injection valve at the tangent point between two adjacent turns of optical fiber; and the cross-sectional area B of the gap formed by the tangent between three turns of optical fiber; B= , where r is the fiber radius; And the following parameter conditions are met: ≥ A ≥ .

[0014] First, the present invention enables the optical fiber to be first guided to the fiber arrangement and then coated with glue, which is completely different from the existing winding method of first coating with glue and then guiding to the fiber arrangement, and can completely avoid the phenomenon of empty glue caused by uneven glue, and can prevent the optical fiber ring body from having bright lines and cracks due to empty glue after the optical fiber ring is wound, thereby ensuring the stability of the optical fiber ring; Second, the automatic glue spraying device of the present invention can realize contactless uniform and accurate glue spraying during optical fiber winding through the coordinated work between the glue spraying unit, the driving unit and the CCD camera. The upper optical fiber surface of the optical fiber ring is uniformly sprayed with high frequency and contactless before the optical fiber ring skeleton is wound. The glue coating track is accurate, continuous and uniform. Moreover, the optical fiber winding and glue spraying can be carried out synchronously, and the winding track and the glue spraying track are in step, which can further ensure the performance and stability of the optical fiber ring product. Thirdly, the present invention can implement the point glue application on the tangent part of two adjacent turns of optical fiber on a layer of the optical fiber ring before the current turn of optical fiber is wound during optical fiber winding. When the optical fiber is wound into the tangent part of the two adjacent turns of optical fiber, it can just combine with the glue. At the same time, the glue will fill the gap formed by the tangent of three turns of optical fiber, forming a line contact glue bonding of a certain arc length, rather than the existing point contact glue bonding, so that the effective bonding amount of glue is increased, which can greatly increase the bonding strength. At the same time, the glue is not dry when the optical fiber is wound, so that the optical fibers will maintain a close bond at the tangent part, thereby improving the product performance and stability of the optical fiber ring.

[0015] Fourthly, the present invention can ensure that at least half of the circumference of each turn of optical fiber in the optical fiber ring is bonded with glue and the bonding is line contact glue, so the bonding effect is very firm and stable, which can multiply the performance and stability of the optical fiber ring product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The invention is a structural schematic diagram of the optical fiber ring on the optical fiber ring frame when the gluing mechanism of the fully automatic optical fiber ring winding machine adopts the existing method to apply glue to the optical fiber contact before winding on the optical fiber ring frame, and then the optical fiber ring is wound on the optical fiber ring frame.

[0017] Figure 2 It is a front view of an automatic glue spraying device used in a fully automatic optical fiber winding machine in the present invention.

[0018] Figure 3 It is a stereoscopic diagram of an automatic glue spraying device used in a fully automatic optical fiber winding machine in the present invention.

[0019] Figure 4 The invention discloses a working principle diagram of an automatic glue spraying device used in a fully automatic optical fiber ring winding machine when winding an optical fiber ring on an optical fiber ring frame.

[0020] Figure 5 It is a partial diagram of the working principle of an automatic glue spraying device used in a fully automatic optical fiber ring winding machine in the present invention when the optical fiber ring is on the optical fiber ring skeleton and when A=B when winding the optical fiber ring.

[0021] Figure 6 It is a partial diagram of the working principle of an automatic glue spraying device used in a fully automatic optical fiber ring winding machine in the present invention when the optical fiber ring is on the optical fiber ring skeleton and when A>B.

[0022] Figure 7 The invention is a stereoscopic diagram of an automatic glue spraying device for a fully automatic optical fiber winding machine installed on a main shaft mechanism of the fully automatic optical fiber winding machine.

[0023] Figure 8 The invention is a front view of an automatic glue spraying device for a fully automatic optical fiber winding machine when the device is installed on a main shaft mechanism of the fully automatic optical fiber winding machine. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Example: See Figure 2 and Figure 3 , an automatic glue spraying device for a fully automatic optical fiber winding machine, comprising a glue spraying unit 1, a CCD camera 2 and a driving unit 3.

[0025] See also Figure 2 and Figure 3 The glue spraying unit 1 includes a glue storage cylinder 1-1, a piezoelectric injection valve 1-2 and an extension needle 1-3. The glue storage cylinder 1-1 is connected to the glue inlet of the piezoelectric injection valve 1-2. The nozzle of the piezoelectric injection valve 1-2 faces upward and is externally connected to the extension needle 1-3. The center line of the extension needle 1-3 intersects vertically with the center line of the optical fiber ring skeleton 4.

[0026] Furthermore, the piezoelectric injection valve adopts the MDS 3000 model, which can be purchased from Vermes, and can be found on the official website: https: / / www.vermes.com. The operation of the piezoelectric injection valve mainly relies on the piezoelectric effect. When voltage is applied to the piezoelectric material, the ions inside the material will be displaced, causing the crystal to deform. When voltage is applied to the piezoelectric sheet, the piezoelectric sheet is deformed, causing the size of the small holes or channels on it to change, causing the fluid pressure to change, and then changing the flow rate or direction of the fluid. In order to achieve precise control of the fluid flow and direction, the piezoelectric injection valve is used in conjunction with the control circuit. By changing the magnitude and frequency of the voltage, the degree of deformation of the piezoelectric sheet and the size change of the fluid channel can be accurately controlled, thereby achieving precise control of the fluid injection. The specific structure and working principle of the piezoelectric injection valve belong to the prior art, so it will not be repeated. The stable operating frequency of the piezoelectric injection valve can be as high as 1000Hz or above, and the high rate characteristics of the piezoelectric injection valve make it perform well in dispensing operations, enabling high-speed and high-precision dispensing operations, and can achieve uniform and precise glue spraying during movement.

[0027] It should be noted that the piezoelectric injection valve can be a known product with a spray volume of 0.1nl or higher precision level each time, and is not limited to the above models, such as: PICO Pµlse model of Nordson EFD; Jetlab 4 model of MicroFab Technologies; MD-K-130 model of Microdrop Technologies, etc.

[0028] See also Figure 2 and Figure 3 The difference between the glue spray unit 1 of the present invention and the existing piezoelectric injection valve 1-2 is that the nozzle of the piezoelectric injection valve 1-2 is upward and is externally connected to an extension needle 1-3 (a structure that is additionally installed on the purchased piezoelectric injection valve), and the center line of the extension needle 1-3 intersects vertically with the center line of the optical fiber ring skeleton 4.

[0029] The extended needle 1-3 is used to solve the problem of glue deflection sprayed by the piezoelectric injection valve 1-2. At the same time, the extended needle 1-3 can be used for the CCD camera 2 to get close to the optical fiber ring on the optical fiber ring skeleton 4 and calculate and compare the relative position distance when acquiring images. Then, the glue spraying unit 1 can be controlled to focus when working and glue can be dispensed at the tangent point of two adjacent turns of optical fiber on the upper layer to complete precise glue dispensing.

[0030] Furthermore, the length of the extended needles 1-3 is 20-30 mm.

[0031] See also Figure 2 and Figure 3 , wherein the driving unit 3 includes a first linear module 3-1, a second linear module 3-2 and a bracket 3-3; the first linear module 3-1 is connected to the bracket 3-3 through the second linear module 3-2; the first linear module 3-1 is used to drive the bracket 3-3 to move axially at a uniform speed along the optical fiber ring skeleton 4; the second linear module 3-2 is used to drive the bracket 3-3 to move radially intermittently along the optical fiber ring skeleton 4.

[0032] See also Figure 2 and Figure 3 , wherein the glue spraying unit 1 and the CCD camera 2 are both fixedly mounted on the bracket 3-3 and move together. When the bracket 3-3 is driven to move by the first linear module 3-1 or / and the second linear module 3-2, the glue spraying unit 1 and the CCD camera 2 will move together, which can ensure the synchronization of image acquisition and glue dispensing position.

[0033] See also Figure 2 and Figure 3The CCD camera 2 is used to obtain real-time image information of the optical fiber ring on the optical fiber ring skeleton 4 and the extension needles 1-3 of the glue spraying unit 1 and send it to the control system, so that the control system controls the glue spraying unit 1 and the driving unit 3 to perform corresponding actions.

[0034] Since the first linear module 3-1 is used to drive the bracket 3-3 to move at a uniform speed along the axial direction of the optical fiber ring skeleton 4, the first linear module 3-1 is also driving the glue spraying unit 1 and the CCD camera 2 to move at a uniform speed along the axial direction of the optical fiber ring skeleton 4. When the optical fiber is wound, the optical fiber ring skeleton 4 rotates at a constant speed, and the automatic fiber arrangement mechanism (not shown in the figure) controls the optical fiber to move at a uniform speed along the axial direction of the optical fiber ring skeleton 4. Therefore, the optical fiber performs an equidistant spiral motion formed by superimposing a linear motion and a circular motion on the optical fiber ring skeleton 4.

[0035] The movement speed of the first linear module 3-1 is equal to and synchronized with that of the automatic fiber arrangement mechanism, so the glue spraying unit 1 can realize an equidistant spiral motion of the glue spraying trajectory on the optical fiber ring on the optical fiber ring skeleton 4, and the CCD camera 2 follows the movement of the glue spraying unit 1 to collect the position of the glue spraying point and the relative position of the current winding optical fiber to see if there is any deviation, and control to make timely corrections.

[0036] See also Figure 2 and Figure 3 , and the second linear module 3-2 is used to drive the bracket 3-3 to intermittently displace radially along the optical fiber ring skeleton 4, and synchronously the second linear module 3-2 also drives the glue spraying unit 1 and the CCD camera 2 to intermittently displace radially along the optical fiber ring skeleton 4. Specifically, when the optical fiber is wound from one end to the other end on the optical fiber ring skeleton 4 on each layer of the optical fiber ring (positive winding or negative winding), the second linear module 3-2 remains in a stopped working state, and then the optical fiber stops winding, and before switching to the next layer, it is necessary to start the second linear module 3-2 to work and drive the glue spraying unit 1 and the CCD camera 2 to displace radially outward (i.e. downward) along the optical fiber ring skeleton 4 by a fiber layer spacing H, and the second linear module 3-2 stops working again, and then the optical fiber is wound on the optical fiber ring skeleton 4 on the optical fiber ring. The next layer of the ring is wound from one end to the other end, so the second linear module 3-2 drives the glue spraying unit 1 and the CCD camera 2 to intermittently displace along the radial direction of the optical fiber ring skeleton 4 to meet the outer diameter of the optical fiber ring increases with the number of layers during winding. In order to ensure that the glue spraying distance of the glue spraying unit 1 and the focusing distance of the CCD camera 2 remain unchanged, it is necessary to intermittently displace the glue spraying unit 1 and the CCD camera 2. Through intermittent movement, accurate glue spraying, image acquisition and optical fiber winding can be achieved for each layer of the optical fiber ring.

[0037] Specifically, the first linear module 3 - 1 and the second linear module 3 - 2 are both CTL linear modules purchased from Guangzhou Hongke Electronic Technology Co., Ltd. (or Hongke Group, HongKe), and their displacement accuracy is as high as ±0.001 mm.

[0038] See also Figure 7 and Figure 8 Furthermore, the glue spraying unit 1 and the CCD camera 2 are both located below the optical fiber ring skeleton 4; the first linear module 3-1 is horizontally fixedly mounted on the frame 7 of the fully automatic optical fiber winding machine 5 and is located below its spindle mechanism 6; and the first linear module 3-1 is parallel to the spindle mechanism 6; and the second linear module 3-2 is vertically located below the spindle mechanism 6; in this way, the optical fiber can be wound in from above the optical fiber ring skeleton 4, and glue can be sprayed below the optical fiber ring, which can avoid interference when winding multi-mode optical fiber and meet production requirements. At the same time, spraying upward can reduce the impact force between the glue and the optical fiber ring and avoid splashing problems.

[0039] See also Figure 2 and Figure 3 Specifically, an inverted T-shaped frame 3-4 is fixed on the slide seat of the first linear module 3-1, and the second linear module 3-2 is vertically fixedly installed on the inverted T-shaped frame 3-4.

[0040] Furthermore, the first linear module 3 - 1 is provided with a first position sensor for sensing the real-time position information of its slide; the second linear module 3 - 2 is provided with a second position sensor for sensing the real-time position information of its slide.

[0041] See also Figure 2 and Figure 3 , further, the CCD camera 2 is obliquely mounted on the bracket 3-3; the center line of the lens of the CCD camera 2 intersects perpendicularly with the center line of the optical fiber ring skeleton 4; the angle K between the center line of the lens of the CCD camera 2 and the center line of the extension needle 1-3 is 20-30°. In this way, the CCD camera 2 can collect the image of the extension needle 1-3 and the optical fiber ring glue dispensing position on the optical fiber ring skeleton 4 and the current winding fiber, which is conducive to data calculation, analysis and processing. The range of image information collected by the CCD camera 2 is to know whether the relative position between the current turn of optical fiber and the current glue spraying position is accurate. When the current turn of optical fiber is offset, the displacement of the fiber arrangement mechanism can be automatically corrected or rectified by the control system. When the glue spraying position of the extension needle 1-3 is offset, the displacement of the first linear module 3-1 of the control system drive unit 3 can be automatically corrected or rectified.

[0042] When the embodiment is in use, the optical fiber is rolled in from the top of the optical fiber ring skeleton, first guided by the fiber evacuation pressure rod of the fiber evacuation mechanism, and then wound around the optical fiber ring of the optical fiber ring skeleton, and the glue spraying unit 1 and the CCD camera 2 are both located below the optical fiber ring skeleton 4, and the glue spraying unit 1 faces upward and dispenses glue on the tangent point of two adjacent turns of optical fiber in the upper layer of the optical fiber ring, and then the optical fiber is on the glue and tangent to the two adjacent turns of optical fiber in the upper layer of the optical fiber ring at the same time. Therefore, the optical fiber is first discharged, and then continues to be wound in before it can be combined with the glue when it is tangent to the two adjacent turns of optical fiber. The glue will fill the gap formed by the tangency of the three turns of optical fiber, forming a line contact glue bonding of an arc length, rather than the existing point contact glue bonding, so that the effective bonding amount of glue is increased, which can greatly increase the bonding strength. At the same time, the glue is not dry when the optical fiber is wound, so that the turns of optical fiber can be completely and densely combined at the tangent point, thereby improving the performance and stability of the optical fiber ring product.

[0043] The automatic glue spraying device can make the optical fiber be guided to the fiber arrangement first and then coated with glue during winding, which is completely different from the existing winding method of coating with glue first and then guiding to the fiber arrangement. It can completely avoid the phenomenon of empty glue caused by uneven glue, and can prevent the phenomenon of bright lines and cracks in the ring body due to empty glue after the optical fiber ring is wound, thereby ensuring the stability of the optical fiber ring.

[0044] The automatic glue spraying device can realize contactless, uniform and precise glue spraying during optical fiber winding through the coordinated work among the glue spraying unit, the driving unit 3 and the CCD camera 2. The upper optical fiber surface of the optical fiber ring is uniformly sprayed with high frequency contactless glue before the optical fiber ring is wound on the optical fiber ring skeleton. The glue coating trajectory is precise, continuous and uniform. The optical fiber winding and glue spraying can be carried out synchronously with each other. The winding trajectory and the glue spraying trajectory are in sync, which can further ensure the performance and stability of the optical fiber ring product.

[0045] In addition, as a control method, it is based on the above-mentioned automatic glue spraying device for a fully automatic optical fiber winding machine, which includes the following steps: S1, connect the optical fiber on the fiber splitter ring to the optical fiber ring frame, rotate the optical fiber ring frame 4, and first wrap around the first layer of the optical fiber ring; S2, starting from the second layer, start the first linear module 3-1 to work and drive the bracket 3-3 and the glue spraying unit 1 and CCD camera 2 thereon to move forward along the axial direction of the optical fiber ring skeleton 4 at a uniform speed, and the piezoelectric injection valve 1-2 dispenses glue at the tangent points of two adjacent turns of optical fiber on the first layer of the optical fiber ring, and the optical fiber is wound along the glue spraying track until the second layer of the optical fiber ring is wound; S3, first drive the bracket 3-3 and the glue spraying unit 1 and CCD camera 2 thereon to move radially downward along the fiber ring skeleton 4 by a fiber layer spacing H through the second linear module 3-2; then start the first linear module 3-1 to work and drive the bracket 3-3 and the glue spraying unit 1 and CCD camera 2 thereon to axially move negatively at a uniform speed, and the piezoelectric injection valve 1-2 dispenses glue at the tangent points of two adjacent turns of optical fiber on the second layer of the optical fiber ring, and at the same time, the optical fiber is wound along the glue dispensing track until the third layer of the optical fiber ring is completed; S4, first drive the bracket 3-3 and the glue spraying unit 1 and CCD camera 2 thereon to move radially downward along the fiber ring skeleton 4 by a fiber layer spacing H through the second linear module 3-2; then start the first linear module 3-1 to work and drive the bracket 3-3 and the glue spraying unit 1 and CCD camera 2 thereon to move forward axially at a uniform speed, and the piezoelectric injection valve 1-2 dispenses glue at the tangent points of two adjacent turns of optical fiber on the third layer of the optical fiber ring, and at the same time, the optical fiber is wound along the glue dispensing track until the fourth layer of the optical fiber ring is wound; S5, first drive the bracket 3-3 and the glue spraying unit 1 and CCD camera 2 thereon to move radially downward along the fiber ring skeleton 4 by the second linear module 3-2 for a fiber layer spacing H; then start the first linear module 3-1 to work and drive the bracket 3-3 and the glue spraying unit 1 and CCD camera 2 thereon to move axially at a uniform speed in a negative direction, and the piezoelectric injection valve 1-2 dispenses glue at the tangent point of two adjacent turns of optical fiber on the fourth layer of the fiber ring (see Figure 4 and Figure 5 ), and at the same time, the optical fiber is wound along the glue-dispensing track until the fifth layer of the optical fiber ring is completed; S6. Follow the above cycle rule until the last layer of the optical fiber ring is completed.

[0046] Therefore, the present invention can achieve the point glue application on the tangent part of two adjacent turns of optical fiber in a layer of the optical fiber ring before the current turn of optical fiber is wound when the optical fiber is wound, and when the optical fiber is wound into the tangent part with the two adjacent turns of optical fiber, it can just combine with the glue, and at the same time, the glue will fill the gap formed by the tangent of three turns of optical fiber, forming a line contact glue bonding of a certain arc length, rather than the existing point contact glue bonding, so that the effective bonding glue amount is increased, which can greatly increase the bonding strength. At the same time, the glue is not dry when the optical fiber is wound, so that each turn of optical fiber can be completely and densely combined at the tangent part, thereby improving the performance and stability of the optical fiber ring product.

[0047] The present invention is configured on a fully automatic optical fiber winding machine, and can complete the automatic glue spraying work when the optical fiber is wound, and can cooperate with the work to realize the fully automatic optical fiber winding production.

[0048] Furthermore, the cross-sectional area A of the glue amount dispensed by the piezoelectric injection valve 1-2 at the tangent point of two adjacent turns of optical fiber; and the cross-sectional area B of the gap formed by the tangent between three turns of optical fiber, B= , where r is the fiber radius; and the following parameter conditions are met, formula 1: ≥ A ≥ .

[0049] When A is equal to B, see Figure 5 The glue just fills the gap formed by the tangent of three turns of optical fiber. There are three arc segments of glue bonding on the outer wall of each turn of optical fiber, and each arc segment is line contact bonding rather than point contact bonding. After the three are added together, half of the circumference of each turn of optical fiber is bonded with glue, so the bonding effect is very strong and stable.

[0050] When A is greater than B, see Figure 6 After the glue fills the gap formed by the tangent of three turns of optical fiber, it will overflow along both sides, increasing the length range of the arc segment for glue bonding. In total, more than half of the circumference of each turn of optical fiber is bonded with glue, and the maximum can be about 2 / 3 of the circumference. Compared with the above A=B, this embodiment will be more stable and firm, and at the same time can avoid the problem of insufficient filling caused by uneven glue dispensing.

[0051] Since A is not greater than This can avoid the problem of excessive glue dispensing (i.e., overdispensing) at the tangent point of two adjacent turns of optical fiber, and the problem of excessive glue before the optical fiber is wound in and higher than the upper edge of the two adjacent turns of optical fiber, which will flow out randomly and be difficult to control evenly.

[0052] For the convenience of calculation, it is assumed that the amount of glue sprayed each time by the piezoelectric injection valve 1-2 during operation is a standard sphere with a volume of V. The maximum cross-sectional area of ​​the sphere is equivalent to A, which is also the maximum orthographic projection area. The relationship between V and A is: Formula 2: V= .

[0053] For example, when the fiber radius r = 100um, the following can be calculated from formula 1: 4292 ≥A ≥1613

[0054] Then, according to formula 2, we can calculate: When A= 1613 When Vmin= =48730 ; When A=4292 When Vmax= =211333 .

[0055] At this time, the reasonable value range of the volume V of the glue sprayed out by the piezoelectric injection valve 1-2 each time is: 211333 ≥V≥48730 .

[0056] When the fiber radius r=100um, the glue amount ejected by the piezoelectric injection valve 1-2 can be set to 200000 =0.2 nanoliter (nl).

[0057] Therefore, the present invention can ensure that at least half of the circumference of each turn of optical fiber in the optical fiber ring is bonded with glue, and the bonding is line contact glue, so the bonding effect is very firm and stable, which can double the performance and stability of the optical fiber ring product.

[0058] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. An automatic glue spraying device for a fully automatic optical fiber winding machine, characterized in that: It comprises a glue spraying unit (1), a CCD camera (2) and a driving unit (3); The glue spraying unit (1) comprises a glue storage cylinder (1-1), a piezoelectric injection valve (1-2) and an extension needle (1-3); the glue storage cylinder (1-1) is connected to a glue inlet of the piezoelectric injection valve (1-2); a nozzle of the piezoelectric injection valve (1-2) is externally connected to the extension needle (1-3); a center line of the extension needle (1-3) intersects vertically with a center line of the optical fiber ring skeleton (4); The driving unit (3) comprises a first linear module (3-1), a second linear module (3-2) and a bracket (3-3); the first linear module (3-1) is connected to the bracket (3-3) via the second linear module (3-2); the first linear module (3-1) is used to drive the bracket (3-3) to move at a uniform speed along the axial direction of the optical fiber ring skeleton (4); the second linear module (3-2) is used to drive the bracket (3-3) to move intermittently along the radial direction of the optical fiber ring skeleton (4); The glue spraying unit (1) and the CCD camera (2) are both arranged on the bracket (3-3) and move together; The CCD camera (2) is used to obtain real-time image information of the optical fiber ring on the optical fiber ring skeleton (4) and the extension needles (1-3) of the glue spraying unit (1) and send it to the control system, so that the control system controls the glue spraying unit (1) and the driving unit (3) to perform corresponding actions.

2. The automatic glue spraying device for a fully automatic optical fiber winding machine according to claim 1, characterized in that: The length of the extended needle (1-3) is 20-30 mm.

3. The automatic glue spraying device for a fully automatic optical fiber winding machine according to claim 1, characterized in that: The piezoelectric injection valve is of the MDS 3000 model.

4. The automatic glue spraying device for a fully automatic optical fiber winding machine according to claim 1, characterized in that: The CCD camera (2) is installed obliquely on the bracket (3-3); The center line of the lens of the CCD camera (2) intersects perpendicularly with the center line of the optical fiber ring skeleton (4); and the angle K between the center line of the lens of the CCD camera (2) and the center line of the extension needle (1-3) is 20-30°.

5. The automatic glue spraying device for a fully automatic optical fiber winding machine according to claim 1, characterized in that: The glue spraying unit (1) and the CCD camera (2) are both located below the optical fiber ring skeleton (4).

6. A control method, using the automatic glue spraying device for a fully automatic optical fiber winding machine as described in any one of claims 1 to 5, characterized in that: The steps include: S1, connect the optical fiber on the fiber splitter ring to the optical fiber ring frame, rotate the optical fiber ring frame (4), and first wrap around the first layer of the optical fiber ring; S2, starting from the second layer, starting the first linear module (3-1) to work and drive the bracket (3-3) and the glue spraying unit (1) and the CCD camera (2) thereon to move forward along the axial direction of the optical fiber ring skeleton (4) at a uniform speed, and the piezoelectric injection valve (1-2) dispenses glue at the tangent points of two adjacent turns of optical fiber on the first layer of the optical fiber ring, and at the same time, the optical fiber is wound along the glue spraying track until the second layer of the optical fiber ring is wound; S3, first, the second linear module (3-2) drives the bracket (3-3) and the glue spraying unit (1) and the CCD camera (2) thereon to move radially downward along the optical fiber ring skeleton (4) by a distance H between optical fiber layers; then, the first linear module (3-1) is started to work and drives the bracket (3-3) and the glue spraying unit (1) and the CCD camera (2) thereon to move axially in a negative direction at a uniform speed, and the piezoelectric injection valve (1-2) dispenses glue at the tangent points of two adjacent turns of optical fiber on the second layer of the optical fiber ring, and at the same time, the optical fiber is wound along the glue spraying track until the third layer of the optical fiber ring is wound; S4, first, the second linear module (3-2) drives the bracket (3-3) and the glue spraying unit (1) and the CCD camera (2) thereon to move radially downward along the optical fiber ring skeleton (4) by a distance H between optical fiber layers; then, the first linear module (3-1) is started to work and drives the bracket (3-3) and the glue spraying unit (1) and the CCD camera (2) thereon to move forward axially at a uniform speed, and the piezoelectric injection valve (1-2) dispenses glue at the tangent points of two adjacent turns of optical fiber on the third layer of the optical fiber ring, and at the same time, the optical fiber is wound along the glue spraying track until the fourth layer of the optical fiber ring is wound; S5, first, the second linear module (3-2) drives the bracket (3-3) and the glue spraying unit (1) and the CCD camera (2) thereon to move radially downward along the optical fiber ring skeleton (4) by a distance H between optical fiber layers; then, the first linear module (3-1) is started to work and drives the bracket (3-3) and the glue spraying unit (1) and the CCD camera (2) thereon to move axially in a negative direction at a uniform speed, and the piezoelectric injection valve (1-2) dispenses glue at the tangent points of two adjacent turns of optical fiber on the fourth layer of the optical fiber ring, and at the same time, the optical fiber is wound along the glue spraying track until the fifth layer of the optical fiber ring is wound; S6. Follow the above cycle rule until the last layer of the optical fiber ring is completed.

7. A control method according to claim 6, characterized in that: The cross-sectional area A of the amount of glue dispensed by the piezoelectric injection valve (1-2) at the tangent point between two adjacent turns of optical fiber; The cross-sectional area B of the gap formed by the tangent three turns of optical fiber; B= , where r is the fiber radius; And the following parameter conditions are met: ≥ A ≥ 。

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