A control method for an automatic glue spraying device of a fully automatic optical fiber looping machine

Abstract

The present invention discloses an automatic glue spraying device for a full-automatic optical fiber looping machine and its control method, which is 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 jet valve and an extended needle; the driving unit includes a first linear module, a second linear module and a bracket; the first linear module is used to drive the bracket to move uniformly along the axial direction of the optical fiber loop skeleton; the second linear module is used to drive the bracket to move intermittently along the radial direction of the optical fiber loop skeleton; the glue spraying unit and the CCD camera move together on the bracket. The present invention can realize the winding method in which the optical fiber is first guided for fiber laying and then coated with glue, avoiding the phenomenon of empty glue caused by uneven glue application. At the same time, when the optical fiber is wound, the glue can fill the gap formed by the tangency of three turns of optical fibers, increasing the effective bonding glue amount between the optical fibers, greatly increasing the bonding strength, and making the tangency part tightly bonded, thereby improving the performance and stability of the optical fiber loop product.

Description

Technical Field

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

[0002] Optical fiber rings are mainly used in the field of inertial navigation. The main customers are military enterprises and scientific research institutions in the optical fiber gyro industry, and the downstream corresponds to modern equipment of various military services such as military aircraft, armored vehicles, and missiles in the sea, land, air, and space; and the application in the civilian product market is also promoted simultaneously, mainly including industrial lasers, ocean monitoring, communication, and smart grids, etc.

[0003] The full - automatic optical fiber winding machine is the core equipment for the production of polarization - maintaining optical fiber rings used in optical fiber gyros. Its structure includes: a main shaft mechanism for optical 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 an appropriate tension during the winding process, a fiber arranging mechanism for controlling the optical fiber to move along a certain trajectory during winding, a glue coating mechanism for optical fiber 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, etc.

[0004] The existing glue coating methods of the glue coating mechanism of the full - automatic optical fiber winding machine are optical fiber glue trough passing glue or a glue - carrying brush of a dot - glue machine (reference can be made to patent documents such as CN115415100A, CN102241483A, CN115106256A, CN110806202A, etc.). They are all contact - type glue coating on the optical fiber and apply glue to the optical fiber by contact before it is wound on the optical fiber ring skeleton; and since the fiber arranging pressure rod of the fiber arranging mechanism of the full - automatic optical fiber winding machine will guide and arrange the optical fiber during the fiber winding (reference can be made to patent documents such as CN117782048A, CN110926451A, CN115421237A, etc.), part of the glue on the optical fiber will be scraped off, resulting in uneven glue - carrying, and there will be a phenomenon of empty glue on the optical fiber ring body (see Figure 1 )

[0005] In addition, when the optical fiber is wound, the effective bonding glue amount between adjacent optical fibers is small, and the adhesive force is only generated at the tangent contact points (i.e., 6 discrete points, which are point - contact glue). The existing glue spraying method cannot completely fill the large gaps formed between the upper and lower layers of optical fibers (see Figure 1 ), resulting in a large number of voids inside the optical fiber ring (i.e., the tangent points of three turns of optical fibers), which will affect the resistance of the optical fiber ring product to external interferences such as vibration and impact, and problems such as optical fiber displacement and loosening are likely to occur during subsequent use, further affecting the performance and stability of the optical fiber ring product. And in an optical fiber gyro (the core is an optical fiber ring), a slight change in the optical fiber position may lead to a decrease in measurement accuracy. Summary of the Invention

[0006] The present invention provides an automatic glue spraying device for a full-automatic optical fiber winding machine, aiming to solve the technical problems in the prior art that the optical fiber is coated with glue in a contact manner and the glue is applied to the optical fiber in contact before it is wound on the optical fiber ring skeleton. During the winding of the optical fiber, the glue application is uneven, resulting in the phenomenon of empty glue in the optical fiber ring body. At the same time, the effective bonding amount of glue between adjacent optical fibers is small, and the adhesive force is only generated at the tangent contact point, thereby affecting the performance and stability of the optical fiber ring product.

[0007] To achieve the above object, the present invention provides an automatic glue spraying device for a full-automatic optical fiber winding machine, which is 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 jet valve and an extended needle. The glue storage cylinder is connected to the glue inlet of the piezoelectric jet valve. The nozzle of the piezoelectric jet valve is externally connected to the extended needle. The center line of the extended needle is perpendicular to and intersects 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 uniformly along the axial direction of the optical fiber ring skeleton. The second linear module is used to drive the bracket to move intermittently 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 along with it. The CCD camera is used to obtain the real-time image information of the optical fiber ring on the optical fiber ring skeleton and the extended 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] Further, the length of the extended needle is 20 - 30 mm.

[0009] Further, the piezoelectric jet valve adopts the MDS 3000 model.

[0010] Further, the CCD camera is inclinedly installed on the bracket. The center line of the lens of the CCD camera is perpendicular to and intersects with the center line of the optical fiber ring skeleton. The included angle K between the center line of the lens of the CCD camera and the center line of the extended needle is 20 - 30°.

[0011] Further, both the glue spraying unit and the CCD camera are 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 full-automatic optical fiber winding machine described in any of the above technical solutions, and is characterized in that it includes the following steps:

[0013] S1. Connect the optical fiber on the fiber splitting ring to the optical fiber ring skeleton, and rotate the optical fiber ring skeleton to wind the first layer of the optical fiber ring first.

[0014] S2. Starting from the second layer, start the first linear module to work and drive the bracket, the glue spraying unit and the CCD camera thereon to move forward uniformly along the axial direction of the optical fiber ring skeleton. The piezoelectric jet valve applies glue at the tangent point between two adjacent turns of the optical fiber on the first layer of the optical fiber ring. At the same time, the optical fiber winds along the glue application trajectory until the second layer of the optical fiber ring is wound;

[0015] S3. First, drive the bracket, the glue spraying unit and the CCD camera thereon to move downward by a fiber layer spacing H along the radial direction of the optical fiber ring skeleton through the second linear module; then start the first linear module to work and drive the bracket, the glue spraying unit and the CCD camera thereon to move negatively along the axial direction uniformly. The piezoelectric jet valve applies glue at the tangent point between two adjacent turns of the optical fiber on the second layer of the optical fiber ring. At the same time, the optical fiber winds along the glue application trajectory until the third layer of the optical fiber ring is wound;

[0016] S4. First, drive the bracket, the glue spraying unit and the CCD camera thereon to move downward by a fiber layer spacing H along the radial direction of the optical fiber ring skeleton through the second linear module; then start the first linear module to work and drive the bracket, the glue spraying unit and the CCD camera thereon to move positively along the axial direction uniformly. The piezoelectric jet valve applies glue at the tangent point between two adjacent turns of the optical fiber on the third layer of the optical fiber ring. At the same time, the optical fiber winds along the glue application trajectory until the fourth layer of the optical fiber ring is wound;

[0017] S5. First, drive the bracket, the glue spraying unit and the CCD camera thereon to move downward by a fiber layer spacing H along the radial direction of the optical fiber ring skeleton through the second linear module; then start the first linear module to work and drive the bracket, the glue spraying unit and the CCD camera thereon to move negatively along the axial direction uniformly. The piezoelectric jet valve applies glue at the tangent point between two adjacent turns of the optical fiber on the fourth layer of the optical fiber ring. At the same time, the optical fiber winds along the glue application trajectory until the fifth layer of the optical fiber ring is wound;

[0018] S6. According to the above step rules, until the last layer of the optical fiber ring is wound.

[0019] Further, the cross-sectional area A of the glue amount applied by the piezoelectric jet valve at the tangent point between two adjacent turns of the optical fiber; and the cross-sectional area B of the gap formed by the tangency between three turns of the optical fiber;

[0020] B = , where r is the radius of the optical fiber;

[0021] And satisfy the following parameter conditions:

[0022] ≥ A ≥ .

[0023] Advantages of the present invention:

[0024] First, the winding method of the present invention enables the optical fiber to be first guided for fiber arranging and then coated with glue, which is completely different from the existing winding method of first coating with glue and then guiding for fiber arranging. It can completely avoid the phenomenon of empty glue caused by uneven glue coating, prevent the bright line and cracking defects of the ring body due to empty glue after the optical fiber winding is completed, and thus ensure the stability of the optical fiber ring.

[0025] Second, through the coordinated work among the glue spraying unit, the driving unit, and the CCD camera of the automatic glue spraying device of the present invention, non-contact, uniform, and precise glue spraying can be achieved during the optical fiber winding. Before winding on the optical fiber ring skeleton, the upper-layer optical fiber surface of the optical fiber ring is uniformly sprayed with glue at a high frequency and in a non-contact manner. The glue coating trajectory is precise, continuous, and uniform. Moreover, the optical fiber winding and glue spraying can be synchronized with each other, and the winding trajectory and the glue spraying trajectory are in step, which can further ensure the product performance and stability of the optical fiber ring.

[0026] Third, the present invention can achieve dot-gluing at the tangent point of two adjacent turns of the upper layer of the optical fiber ring before the current turn of the optical fiber is wound. When the optical fiber is wound into contact with the two adjacent turns of the optical fiber, it can just combine with the glue. At the same time, the glue will fill the gap formed by the tangency of the three turns of the optical fiber, forming a linear contact glue bond with an arc length. Instead of the existing point-contact glue bond, the amount of effective bonding glue increases, which can greatly increase the bonding strength. At the same time, when the optical fiber is wound, the glue has not dried, so that the optical fibers will maintain a dense combination at the tangent point, thereby improving the product performance and stability of the optical fiber ring.

[0027] Fourth, the present invention can make at least half of the circumference of each turn of the optical fiber in the optical fiber ring have a glue bond and be in a linear contact glue bond. Therefore, the bonding effect is very firm and stable, which can multiply improve the product performance and stability of the optical fiber ring. Description of the Drawings

[0028] Figure 1 It is a schematic structural diagram of the optical fiber ring on the optical fiber ring skeleton when the glue coating mechanism of the full-automatic optical fiber winding machine coats the optical fiber with glue in contact before winding it on the optical fiber ring skeleton using the existing method.

[0029] Figure 2 It is a front view of an automatic glue spraying device for a full-automatic optical fiber winding machine in the present invention.

[0030] Figure 3 It is a three-dimensional view of an automatic glue spraying device for a full-automatic optical fiber winding machine in the present invention.

[0031] Figure 4 It is a working principle diagram of the optical fiber ring on the optical fiber ring skeleton when an automatic glue spraying device for a full-automatic optical fiber winding machine in the present invention winds the optical fiber ring.

[0032] Figure 5It is a partial working principle diagram of an automatic glue spraying device for a full-automatic optical fiber winding machine in the present invention when the optical fiber ring is on the optical fiber ring skeleton and A = B during the winding of the optical fiber ring.

[0033] Figure 6 It is a partial working principle diagram of an automatic glue spraying device for a full-automatic optical fiber winding machine in the present invention when the optical fiber ring is on the optical fiber ring skeleton and A > B during the winding of the optical fiber ring.

[0034] Figure 7 It is a three-dimensional view of an automatic glue spraying device for a full-automatic optical fiber winding machine in the present invention when it is installed on the main shaft mechanism of the full-automatic optical fiber winding machine.

[0035] Figure 8 It is a front view of an automatic glue spraying device for a full-automatic optical fiber winding machine in the present invention when it is installed on the main shaft mechanism of the full-automatic optical fiber winding machine. Specific embodiments

[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0037] Embodiment: Refer to Figure 2 and Figure 3 An automatic glue spraying device for a full-automatic optical fiber winding machine, which includes a glue spraying unit 1, a CCD camera 2, and a driving unit 3.

[0038] Refer to Figure 2 and Figure 3 Among them, the glue spraying unit 1 includes a glue storage cylinder 1-1, a piezoelectric jet valve 1-2, and an extended needle 1-3. The glue storage cylinder 1-1 is connected to the glue inlet of the piezoelectric jet valve 1-2. The nozzle of the piezoelectric jet valve 1-2 faces upward and is externally connected to the extended needle 1-3. The center line of the extended needle 1-3 is perpendicular to and intersects the center line of the optical fiber ring skeleton 4.

[0039] Furthermore, the piezoelectric jet valve adopts the MDS 3000 model. The operation of the piezoelectric jet valve mainly relies on the piezoelectric effect. When a voltage is applied to the piezoelectric material, the ions inside the material will displace, causing the crystal to deform. When the voltage is applied to the piezoelectric sheet, the piezoelectric sheet deforms, changing the size of the small holes or channels on it, causing a change in fluid pressure, and further changing the flow rate or direction of the fluid. To achieve precise control of the fluid flow rate and direction, the piezoelectric jet valve is used in conjunction with a control circuit. By changing the magnitude and frequency of the voltage, the deformation degree of the piezoelectric sheet and the size change of the fluid channel can be precisely controlled, thereby achieving precise control of fluid injection. The specific structure and working principle of the piezoelectric jet valve belong to the prior art, so they will not be elaborated here. The stable operating frequency of this piezoelectric jet valve can be as high as 1000 Hz or above, and the high-frequency characteristics of the piezoelectric jet valve make it perform excellently in the dispensing operation, capable of achieving high-speed and high-precision dispensing operations, and can achieve uniform and precise glue spraying during movement.

[0040] It should be noted that the piezoelectric jet valve can adopt known products with a glue spraying volume of 0.1 nl level or higher precision level each time, and is not limited to the above model.

[0041] See Figure 2 and Figure 3 In this regard, compared with the existing piezoelectric jet valve 1-2, the glue spraying unit 1 of the present invention is different in that the nozzle of the piezoelectric jet valve 1-2 faces upward and is externally connected with an extended needle 1-3 (a structure additionally installed on the purchased piezoelectric jet valve), and the center line of the extended needle 1-3 and the center line of the optical fiber ring skeleton 4 are vertically intersecting.

[0042] The extended needle 1-3 is used to solve the problem of the glue ejected by the piezoelectric jet valve 1-2 being deflected. At the same time, the extended needle 1-3 can be used for calculating and comparing the relative position distance with the optical fiber ring on the optical fiber ring skeleton 4 when the CCD camera 2 performs image acquisition, and then the focusing can be controlled when the glue spraying unit 1 works to complete the glue dispensing at the tangent point of two adjacent turns of optical fibers on the upper layer, achieving precise glue dispensing.

[0043] Furthermore, the length of the extended needle 1-3 is 20 - 30 mm.

[0044] See Figure 2 and Figure 3 Among them, 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 displace uniformly 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 displace intermittently along the radial direction of the optical fiber ring skeleton 4.

[0045] Refer to Figure 2 and Figure 3 , wherein, the glue spraying unit 1 and the CCD camera 2 are both fixedly installed on the bracket 3-3 and move therewith. 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 therewith, ensuring the synchronization of image acquisition and dispensing position.

[0046] Refer to Figure 2 and Figure 3 , the CCD camera 2 is used to obtain the real-time image information of the fiber optic loop on the fiber optic loop skeleton 4 and the extension needle 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.

[0047] Since the first linear module 3-1 is used to drive the bracket 3-3 to move uniformly along the axis of the fiber optic loop skeleton 4, synchronously, the first linear module 3-1 is also driving the glue spraying unit 1 and the CCD camera 2 to move uniformly along the axis of the fiber optic loop skeleton 4. When the fiber optic loop skeleton 4 rotates at a constant speed during fiber winding, and the automatic fiber laying mechanism (not shown in the figure) will control the fiber to move uniformly along the axis of the fiber optic loop skeleton 4. Therefore, the fiber makes an equidistant helical motion formed by the superposition of linear motion and circular motion on the fiber optic loop skeleton 4.

[0048] And the moving speed of the first linear module 3-1 is equal to and synchronized with that of the automatic fiber laying mechanism. Therefore, the glue spraying unit 1 can realize that the glue spraying trajectory on the fiber optic loop on the fiber optic loop skeleton 4 is also an equidistant helical motion. The CCD camera 2 follows the movement of the glue spraying unit 1 to collect whether there is a deviation in the position of the glue spraying point and the relative position of the current winding fiber, and controls to make timely corrections.

[0049] Refer to Figure 2 and Figure 3, and the second linear module 3-2 is used to drive the bracket 3-3 to perform intermittent displacement along the radial direction of the optical fiber loop skeleton 4. Synchronously, the second linear module 3-2 also drives the glue spraying unit 1 and the CCD camera 2 to perform intermittent displacement along the radial direction of the optical fiber loop skeleton 4. Specifically, when the optical fiber is wound from one end to the other end on each layer of the optical fiber loop on the optical fiber loop skeleton 4 (either in the positive winding direction or the negative winding direction), the second linear module 3-2 remains in a stopped working state. Then, when the optical fiber stops winding and before switching to the next layer, it is necessary to first start the second linear module 3-2 to work and drive the glue spraying unit 1 and the CCD camera 2 to displace outward (i.e., downward) along the radial direction of the optical fiber loop skeleton 4 by a fiber layer spacing H. Then the second linear module 3-2 stops working again, and then the optical fiber is wound from one end to the other end on the next layer of the optical fiber loop on the optical fiber loop skeleton 4. Therefore, the second linear module 3-2 drives the glue spraying unit 1 and the CCD camera 2 to perform intermittent displacement along the radial direction of the optical fiber loop skeleton 4 to meet the requirement that the outer diameter of the optical fiber loop increases as the number of layers increases during winding. In order to ensure the constant glue spraying distance of the glue spraying unit 1 and the constant focusing distance of the CCD camera 2, it is necessary to intermittently displace the glue spraying unit 1 and the CCD camera 2. Through intermittent movement, precise glue spraying, image acquisition, and optical fiber winding can be achieved for each layer of the optical fiber loop.

[0050] Specifically, both the first linear module 3-1 and the second linear module 3-2 are CTL linear modules.

[0051] See Figure 7 and Figure 8 , further, both the glue spraying unit 1 and the CCD camera 2 are located below the optical fiber loop skeleton 4; the first linear module 3-1 is horizontally fixedly installed on the frame 7 of the full-automatic optical fiber winding machine 5 and is located below its main shaft mechanism 6; and the first linear module 3-1 is parallel to the main shaft mechanism 6; while the second linear module 3-2 is vertically located below the main shaft mechanism 6; in this way, the optical fiber can be wound in from above the optical fiber loop skeleton 4, and glue spraying can be performed below the optical fiber loop, which can avoid interference during multi-mode optical fiber winding, meet the production requirements, and at the same time spray upward, which can reduce the impact force between the glue and the optical fiber loop and avoid the problem of splashing.

[0052] See Figure 2 and Figure 3 , specifically, an inverted T-shaped frame 3-4 is fixed on the slide 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.

[0053] Further, a first position sensor for sensing the real-time position information of its slide is provided on the first linear module 3-1; a second position sensor for sensing the real-time position information of its slide is provided on the second linear module 3-2.

[0054] See Figure 2 and Figure 3 Further, the CCD camera 2 is inclinedly mounted on the bracket 3-3; the center line of the lens of the CCD camera 2 perpendicularly intersects the center line of the optical fiber loop skeleton 4; the included angle K between the center line of the lens of the CCD camera 2 and the center line of the lengthened needle 1-3 is 20-30°. In this way, the CCD camera 2 can satisfy the acquisition of the glue dispensing position of the optical fiber loop on the lengthened needle 1-3 and the current winding optical fiber image on the optical fiber loop skeleton, which is beneficial to data calculation, analysis and processing. The range of the image information collected by the CCD camera 2 can know whether the relative position between the current turn of the optical fiber and the current glue spraying position is accurate. When the current turn of the optical fiber is offset, the displacement of the fiber arranging mechanism can be controlled by the control system to be automatically corrected or rectified. When the glue spraying position of the lengthened needle 1-3 is offset, the displacement of the first linear module 3-1 of the driving unit 3 of the control system can be driven to be automatically corrected or rectified.

[0055] When in use in the embodiment, the optical fiber is wound in from above the optical fiber loop skeleton, first through the guiding and fiber arranging action of the fiber arranging pressing rod of the fiber arranging mechanism, and then wound on the optical fiber loop of the optical fiber loop skeleton. The glue spraying unit 1 and the CCD camera 2 are both located below the optical fiber loop skeleton 4. The glue spraying unit 1 faces upward and dispenses glue at the tangent point between two adjacent turns of the upper layer of the optical fiber loop. Then the optical fiber is on the glue and simultaneously in tangent contact with two adjacent turns of the upper layer of the optical fiber loop. Therefore, after the optical fiber is first fiber arranged and then continues to be wound and is tangent to two adjacent turns of the optical fiber, it can just be combined with the glue, and the glue will fill the gap formed by the tangency of three turns of the optical fiber, forming a linear contact glue bond with an arc length, rather than the existing point contact glue bond, increasing the effective bonding glue amount, greatly increasing the bonding strength. At the same time, when the optical fiber is wound, the glue is not dry, so that the turns of the optical fiber can be completely and densely combined at the tangent point, thereby improving the performance and stability of the optical fiber loop product.

[0056] This automatic glue spraying device can make the optical fiber be wound in a way of being first fiber arranged and then coated with glue, which is completely different from the existing winding method of being first coated with glue and then fiber arranged, and can completely avoid the phenomenon of empty glue caused by uneven glue application, and can prevent the bad phenomena of bright lines and cracking of the loop body due to empty glue after the optical fiber loop is wound, thereby ensuring the stability of the optical fiber loop.

[0057] This automatic glue spraying device can work in coordination among the glue spraying unit, the driving unit 3 and the CCD camera 2 to achieve non-contact, uniform and accurate glue spraying during optical fiber winding. Before winding on the optical fiber loop skeleton, non-contact and uniform glue spraying is carried out on the surface of the upper layer of the optical fiber loop at a high frequency. The glue coating trajectory is accurate, continuous and uniform. The optical fiber winding and glue spraying can be carried out synchronously, and the winding trajectory and the glue spraying trajectory are in step, which can further ensure the performance and stability of the optical fiber loop product.

[0058] In addition, as a control method, based on the above-described automatic glue spraying device for a fully automatic optical fiber winding machine, it includes the following steps:

[0059] S1. Connect the optical fiber on the fiber splitting ring to the optical fiber ring skeleton. By rotating the optical fiber ring skeleton 4, the first layer of the optical fiber ring is wound first.

[0060] 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 the CCD camera 2 thereon to move forward uniformly along the axis of the optical fiber ring skeleton 4. The piezoelectric jet valve 1-2 applies glue at the tangent point between two adjacent turns of the optical fiber on the first layer of the optical fiber ring. At the same time, the optical fiber winds along the glue application trajectory until the second layer of the optical fiber ring is wound.

[0061] S3. First, drive the bracket 3-3 and the glue spraying unit 1 and the CCD camera 2 thereon to move downward by a fiber layer spacing H along the diameter of the optical fiber ring skeleton 4 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 the CCD camera 2 thereon to move negatively uniformly along the axis. The piezoelectric jet valve 1-2 applies glue at the tangent point between two adjacent turns of the optical fiber on the second layer of the optical fiber ring. At the same time, the optical fiber winds along the glue application trajectory until the third layer of the optical fiber ring is wound.

[0062] S4. First, drive the bracket 3-3 and the glue spraying unit 1 and the CCD camera 2 thereon to move downward by a fiber layer spacing H along the diameter of the optical fiber ring skeleton 4 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 the CCD camera 2 thereon to move positively uniformly along the axis. The piezoelectric jet valve 1-2 applies glue at the tangent point between two adjacent turns of the optical fiber on the third layer of the optical fiber ring. At the same time, the optical fiber winds along the glue application trajectory until the fourth layer of the optical fiber ring is wound.

[0063] S5. First, drive the bracket 3-3 and the glue spraying unit 1 and the CCD camera 2 thereon to move downward by a fiber layer spacing H along the diameter of the optical fiber ring skeleton 4 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 the CCD camera 2 thereon to move negatively uniformly along the axis. The piezoelectric jet valve 1-2 applies glue at the tangent point between two adjacent turns of the optical fiber on the fourth layer of the optical fiber ring (see Figure 4 and Figure 5 ), and at the same time, the optical fiber winds along the glue application trajectory until the fifth layer of the optical fiber ring is wound.

[0064] S6. According to the above step rules, until the last layer of the optical fiber ring is wound.

[0065] Therefore, the present invention can achieve that when winding the optical fiber, before the current turn of the optical fiber is wound, glue is applied to the tangent point of two adjacent turns of the optical fiber on the upper layer of the optical fiber loop. When the optical fiber is wound into tangency with the two adjacent turns of the optical fiber, it can just combine with the glue. At the same time, the glue will fill the gap formed by the tangency of three turns of the optical fiber, forming a linear contact glue bond with an arc length, rather than the existing point contact glue bond. This increases the effective bonding glue amount, greatly increases the bonding strength. At the same time, when the optical fiber is wound, the glue is not dry, so that the optical fibers can be completely and densely combined at the tangent points, thereby improving the performance and stability of the optical fiber loop product.

[0066] The present invention is configured on a full-automatic optical fiber winding machine and can complete the automatic glue spraying work during the optical fiber winding process, and can cooperate to achieve full-automatic optical fiber loop production.

[0067] Further, the cross-sectional area A of the glue amount applied by the piezoelectric jet valve 1-2 to the tangent point of two adjacent turns of the optical fiber; and the cross-sectional area B of the gap formed by the tangency of three turns of the optical fiber, B = , where r is the radius of the optical fiber; and the following parameter conditions are satisfied, Formula 1:

[0068] ≥ A ≥ .

[0069] When A is equal to B, reference can be made to Figure 5 , the glue just fills the gap formed by the tangency of three turns of the optical fiber. There are three arc segments of glue bond on the outer wall surface of each turn of the optical fiber, and each arc segment is a linear contact bond, rather than a point contact bond. After summing up the three, half of the circumference of each turn of the optical fiber has glue bond, so the bonding effect is very firm and stable.

[0070] When A is greater than B, reference can be made to Figure 6 , after the glue fills the gap formed by the tangency of three turns of the optical fiber, it will overflow along both sides, increasing the arc length range of the glue bond. After summing up, each turn of the optical fiber has more than half of the circumference with glue bond, and the maximum can account for 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, the problem of uneven glue filling caused by uneven glue application can be avoided.

[0071] Since A is not greater than , this can avoid the problem of excessive (i.e., over-dose) glue application when applying glue to the tangent point of two adjacent turns of the optical fiber. Before the optical fiber is wound in, the excess amount is higher than the upper edge of the two adjacent turns of the optical fiber and will flow out randomly, making it difficult to control evenly.

[0072] For the convenience of calculation, it is assumed that the glue amount ejected by the piezoelectric jet valve 1-2 each time during operation is a standard spherical shape, and its volume is V. Then 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:

[0073] V = 。

[0074] For example, when r fiber radius = 100 um, from Formula 1, it can be calculated that:

[0075] 4292 ≥A ≥1613

[0076] Then, from Formula 2, it can be calculated that:

[0077] When A = 1613 , Vmin = = 48730 ;

[0078] When A = 4292 , Vmax = = 211333 。

[0079] At this time, the reasonable value range of the volume V of the glue ejected by the piezoelectric jet valve 1-2 each time is: 211333 ≥V≥48730 。

[0080] When the fiber radius r = 100 um, the amount of glue ejected by the piezoelectric jet valve 1-2 each time can be set to 200000 = 0.2 nanoliters (nl).

[0081] Therefore, the present invention can make at least half of the circumference of each turn of the optical fiber in the optical fiber ring have glue bonding and be in line contact glue bonding. Therefore, the bonding effect is very firm and stable, and can double the performance and stability of the optical fiber ring product.

[0082] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations according to the concept of the present invention without creative labor. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field of the present invention based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. A control method for an automatic glue spraying device of a fully automatic optical fiber winding machine, characterized in that: The automatic glue spraying device 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 an 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 support (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 support (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 support (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 needle (1-3) of the glue spraying unit (1) and send it to a control system, so that the control system controls the glue spraying unit (1) and the driving unit (3) to perform corresponding actions. The control method adopts the automatic glue spraying device and comprises 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, 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 steps until the last layer of the optical fiber ring is completed.

2. The control method of an automatic glue spraying device for a fully automatic optical fiber winding machine according to claim 1, 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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