Skeletonless double loop winding device and method for fiber optic rotation seismograph

Abstract

The application provides a skeleton-free double-ring winding device for a fiber-optic rotary seismic instrument, which comprises a rotatable skeleton-free double-ring winding tool, and is further provided with a first fiber first fiber disc, a first fiber second fiber disc, a second fiber first fiber disc and a second fiber second fiber disc. Three of the first fiber first fiber disc, the first fiber second fiber disc, the second fiber first fiber disc and the second fiber second fiber disc rotate synchronously with the skeleton-free double-ring winding tool, and the other one is fixed in position, so that the fiber is wound on the skeleton-free double-ring winding tool from the middle part. The fiber ring wound by the device solves the problem that the traditional single-polarization fiber ring cannot simultaneously improve the zero-bias stability and the sensitivity.

Description

Technical Field

[0001] This invention relates to the field of fiber optic ring manufacturing, and in particular to a winding device and method for a frameless double ring for a fiber optic rotating seismograph. Background Technology

[0002] A fiber optic rotating seismograph is a sensor used to measure earthquakes, crustal deformation, and related applications. It is also based on the Sagnac effect, but its goal is not to measure rotation, but rather the relative deformation within the optical fiber. When an earthquake or crustal movement occurs, the optical fiber experiences a change in optical path difference due to relative displacement or stretching. The fiber optic rotating seismograph reflects seismic activity or crustal deformation by measuring this change in optical path difference. Both zero-bias stability and sensitivity are important considerations for fiber optic rotating seismographs, because higher sensitivity in earthquake monitoring determines the ability to acquire low-frequency (ultra-low-frequency) seismic signals through zero-bias stability.

[0003] Currently, single-polarization fiber loops made from a single fiber can only selectively improve one of the two parameters: zero-bias stability and sensitivity. They are mainly used in fiber optic gyroscopes, which are primarily used in inertial navigation, aerospace, geological exploration, and other scenarios that require precise measurement of rotation, measuring rotation angles or angular velocities. Therefore, they are more concerned with zero-bias stability and cannot meet the application requirements of fiber optic rotating seismographs. Summary of the Invention

[0004] This invention provides a frameless double-ring winding device and method for fiber optic rotating seismographs, which solves the problem that traditional single-polarization fiber optic rings cannot simultaneously improve zero-polarization stability and sensitivity.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a frameless double-ring winding device for a fiber optic rotating seismograph, comprising a rotatable frameless double-ring winding fixture, and further comprising a first fiber optic first splitter, a first fiber optic second splitter, a second fiber optic first splitter, and a second fiber optic second splitter. Three of the first fiber optic first splitter, the first fiber optic second splitter, the second fiber optic first splitter, and the second fiber optic second splitter rotate synchronously with the frameless double-ring winding fixture, and the other of the first fiber optic first splitter, the first fiber optic second splitter, the second fiber optic first splitter, and the second fiber optic second splitter is fixed in position so that the optical fiber is wound around the frameless double-ring winding fixture from the middle.

[0006] In a preferred embodiment, the frameless double-wrap tooling includes a first core and a second core arranged side by side, with an intermediate auxiliary partition between the first core and the second core. A first side plate and a second side plate are respectively provided on the outer side of the first core and the second core. Multiple fiber-threading slots are provided on the outer edge of the intermediate auxiliary partition, and optical fibers are wound alternately between the first core and the second core through the fiber-threading slots.

[0007] In a preferred embodiment, the first core and the second core each include two semi-cylindrical core petals, each core petal is detachably connected to each side plate on its planar side, the two core petals of the same core are spliced ​​together to form a complete cylindrical shape, and there is a gap between the core petals. The intermediate auxiliary partition includes multiple circumferentially arranged fan-shaped petals, which are detachably connected to the core petals of the first core or the second core.

[0008] In a preferred embodiment, at least four positioning pins are provided, each positioning pin passing through the first side plate and the first core to be inserted into the second core.

[0009] In a preferred embodiment, a conical filler sheet is provided in the gap between the core lobes. One end of the conical filler sheet is flush with the cylindrical surface of the core lobe, and the thickness of the conical filler sheet near the outer edge of the first core is less than the thickness away from the outer edge of the first core.

[0010] In a preferred embodiment, the fan-shaped petal has a conical outer edge near its outer edge, and a first cladding and a second cladding that can be separated from the conical outer edge are respectively provided on both sides of the conical outer edge. The first cladding and the second cladding are used to abut against the optical fiber.

[0011] In the preferred embodiment, the outer edges of the first and second shells are provided with hinged lugs, and a rotating shaft is also provided, with both ends of the rotating shaft hinged to each hinged lug.

[0012] In a preferred embodiment, the outer edge of the cone surface is provided with cone grooves on both sides, and one end of the cone groove near the outer edge of the cone surface is provided with an inner hook. The first shell and the second shell are provided with an outer hook at one end near the inner edge of the fan-shaped petal. The outer hook is located in the cone groove, and the outer edge of the cone surface is retracted so that the inner hook hooks the outer hook and moves obliquely inward.

[0013] Including fiber winding methods: The first and second optical fibers are wound from the center. The first half of the first optical fiber starts from the middle auxiliary partition in the middle of the frameless double-wrap tooling and is arranged in a right-hand spiral towards the first outer side. The first half of the second optical fiber starts from the middle auxiliary partition and is arranged in a right-hand spiral towards the second outer side, forming the first layer of optical fiber. The second half of the first optical fiber passes through the fiber-threading slot and is arranged in a right-hand spiral from the middle auxiliary partition to the second outer side. The second half of the second optical fiber passes through the fiber-threading slot and is arranged in a right-hand spiral from the middle auxiliary partition to the first outer side, forming the second layer of optical fiber. The second half of the first optical fiber is arranged in a left-hand spiral from the outermost side plate of the frameless double-wrap tooling towards the center, and the second half of the second optical fiber is arranged in a left-hand spiral from the outermost side plate of the frameless double-wrap tooling towards the center, forming the third layer of optical fiber. The first half of the first optical fiber is arranged in a left-hand spiral from the outermost side plate of the frameless double-wrap tooling towards the center, and the first half of the second optical fiber is arranged in a left-hand spiral from the outermost side plate of the frameless double-wrap tooling towards the center, forming the fourth layer of optical fiber. The first half of the first optical fiber passes through the fiber-threading slot and is arranged in a left-hand spiral from the middle auxiliary partition to the second outer side. The first half of the second optical fiber passes through the fiber-threading slot and is arranged in a left-hand spiral from the middle auxiliary partition to the first outer side, forming the fifth layer of optical fiber. The second half of the first optical fiber passes through the fiber-threading slot and is arranged in a left-hand spiral from the middle auxiliary partition to the first outer side. The second half of the second optical fiber passes through the fiber-threading slot and is arranged in a left-hand spiral from the middle auxiliary partition to the second outer side, forming the sixth layer of optical fiber. The second half of the first optical fiber is arranged in a right-hand spiral from the outermost side plate towards the center, and the second half of the second optical fiber is arranged in a right-hand spiral from the outermost side plate towards the center, forming the seventh layer of optical fiber. The first half of the first optical fiber is arranged in a right-hand spiral from the second outer side plate toward the center, and the first half of the second optical fiber is arranged in a right-hand spiral from the first outer side plate toward the center, forming the eighth layer of optical fiber. During the winding process, adhesive is applied to the outer wall of the optical fiber. The above eight-layer winding method is repeated until the winding is completed. After the adhesive solidifies, the frameless double-ring winding fixture is removed to obtain a frameless double-ring optical fiber ring.

[0014] The beneficial effects of this invention are as follows: the winding fixture with an intermediate auxiliary partition can wind both left and right rings simultaneously; the winding fixture adopts a splicing design, which facilitates disassembly and demolding; the dual-fiber winding gives the fiber ring dual polarization characteristics, which can simultaneously improve zero-bias stability and sensitivity to meet the requirements of fiber optic rotating seismographs; the fiber ring has four pigtails, which can connect two optical path systems at the same time, making its application scenarios more extensive. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the winding device of the present invention.

[0017] Figure 2 This is a schematic diagram of the main rotation axis of the present invention.

[0018] Figure 3 This is a structural diagram of the frameless double-wrap tooling of the present invention.

[0019] Figure 4 This is an internal view of the frameless double-ring tooling of the present invention.

[0020] Figure 5 This is a diagram showing the installation of the fan-shaped petals of the present invention.

[0021] Figure 6 This is a schematic diagram of the fan-shaped petals of the present invention.

[0022] Figure 7 This is a schematic diagram of the finished frameless ring of the present invention.

[0023] Figure 8 This is a schematic diagram of the conical filling sheet of the present invention.

[0024] Figure 9 This is a schematic diagram of the optical fiber passing through the fiber slot of the present invention.

[0025] Figure 10 This is a schematic diagram of the shell hinge of the present invention.

[0026] Figure 11 This is a cross-sectional view of the casing of the present invention.

[0027] Figure 12 This is an enlarged cross-sectional view of the casing of the present invention.

[0028] Figure 13 This is an enlarged view of the conical groove of the present invention.

[0029] Figure 14 This is a schematic diagram of the hook connection at the conical groove of the present invention.

[0030] Figure 15 This is a diagram of the optical fiber winding interface of the present invention.

[0031] In the figure: 1. Frameless double-ring tooling; 2. First side plate; 201. Second side plate; 3. First screw; 4. First core; 401. Second core; 402. Conical filler plate; 5. Intermediate auxiliary partition; 501. Fan-shaped petal; 502. First shell; 503. Second shell; 504. Outer edge of conical surface; 505. Fiber grooving slot; 506. Hinge ear seat; 507. Rotating shaft; 508. Conical groove; 509. Inner hook; 510. Outer hook; 6. Positioning pin; 7. Frameless ring; 8. Optical fiber; 9. Main rotating shaft; 901. Secondary shaft; 10. First fiber splitter disc; 1001. Second fiber splitter disc; 11. Second fiber splitter disc; 1101. Splitter disc fixing position; 12. Detailed Implementation

[0032] Example 1: like Figure 1-15Among them, a frameless double-ring winding device for a fiber optic rotating seismograph includes a rotatable frameless double-ring winding fixture 1, and also includes a first fiber optic first splitter 10, a first fiber optic second splitter 1001, a second fiber optic first splitter 11, and a second fiber optic second splitter 1101. Three of the first fiber optic first splitter 10, the first fiber optic second splitter 1001, the second fiber optic first splitter 11, and the second fiber optic second splitter 1101 rotate synchronously with the frameless double-ring winding fixture 1, and the other one of the first fiber optic first splitter 10, the first fiber optic second splitter 1001, the second fiber optic first splitter 11, and the second fiber optic second splitter 1101 is fixed in position so that the optical fiber is wound around the frameless double-ring winding fixture 1 from the middle.

[0033] One end of the main rotating shaft 9 is connected to a drive motor, and the other end of the main rotating shaft 9 is equipped with a frameless double-wrap tooling 1. A secondary shaft 901 is also provided, which is detachably connected to the main rotating shaft 9 and rotates synchronously with it. A first fiber optic first splitter 10 and a first fiber optic second splitter 1001 are mounted on the main rotating shaft 9, and a second fiber optic second splitter 1101 is mounted on the secondary shaft 901. A splitter fixing position 12 is also provided, and the second fiber optic first splitter 11 is fitted onto the splitter fixing position 12 and rotates. At regular intervals, the splitter on the splitter fixing position 12 is replaced to achieve multi-pole winding of the optical fiber.

[0034] In a preferred embodiment, the frameless double-wrap tooling 1 includes a first core 4 and a second core 401 arranged side by side, with an intermediate auxiliary partition 5 between the first core 4 and the second core 401. A first side plate 2 and a second side plate 201 are respectively provided on the outer sides of the first core 4 and the second core 401. The outer edge of the intermediate auxiliary partition 5 is provided with a plurality of fiber-threading slots 505, and the optical fiber is wound alternately between the first core 4 and the second core 401 through the fiber-threading slots 505.

[0035] The two ends of the optical fiber are wound on the fiber distribution plate, and the winding starts from the middle. After one end of the same optical fiber is wound on the first core 4, the other end is shuttled from the nearest fiber slot 505 to the second core 401 to continue winding.

[0036] In a preferred embodiment, the first core 4 and the second core 401 each include two semi-cylindrical core petals, each core petal being detachably connected to each side plate on its planar side, and the two core petals of the same core being spliced ​​together to form a complete cylindrical shape. A gap is provided between the core petals, and the intermediate auxiliary partition 5 includes a plurality of circumferentially arranged fan-shaped petals 501, which are detachably connected to the core petals of the first core 4 or the second core 401.

[0037] In a preferred embodiment, at least four positioning pins 6 are provided, each positioning pin 6 passing through the first side plate 2 and the first core 4 to be inserted into the second core 401.

[0038] Each core is positioned by at least two locating pins 6 and connected to the cores arranged side by side, ensuring the roundness of the assembled cylinder and ensuring that the two cylinders are coaxial. On this basis, the side plate is laterally locked to the core by the first screw 3, and the fan-shaped petals 501 are connected to the core by flat-head screws.

[0039] During demolding, first remove the secondary shaft 901, remove the frameless double-ring tooling 1 from the main rotating shaft 9, then remove the first screw 3 and the positioning pin 6, and then peel off the first side plate 2 and the second side plate 201 to expose the first core 4 and the second core 401. Since there is a gap between the core petals, the core petals of the first core 4 can be pulled inward to close the gap, and the core petals of the first core 4 are torn off.

[0040] If the gap spacing is too large, the optical fiber will be a straight line segment instead of a circular arc when it passes around. If the gap spacing is too small, the allowable inward retraction distance of the core lobe will be reduced, making it difficult for the core lobe to be peeled off from the inner wall of the frameless ring 7.

[0041] In a preferred embodiment, a conical filler plate 402 is provided in the gap between the core lobes. One end of the conical filler plate 402 is flush with the cylindrical surface of the core lobe, and the thickness of the conical filler plate 402 near the outer edge of the first core 4 is less than the thickness away from the outer edge of the first core 4.

[0042] A conical filler plate 402 is used to fill the gap. The inner end of the conical filler plate 402 abuts against the main rotating shaft 9. After the frameless double-ring tooling 1 is pulled out from the main rotating shaft 9, the conical filler plate 402 is moved inward a short distance and then slides out from the side. The core flap can be peeled off from the inner wall of the frameless ring 7 using the gap created by removing the conical filler plate 402. The thickness of the conical filler plate 402 can be adjusted to facilitate the peeling off of the core flap.

[0043] Because the intermediate auxiliary partition 5 is located between the first core 4 and the second core 401, during the winding process, the optical fiber 8, after passing through the fiber insertion slot 505 from the first side of the fan-shaped petal 501, adheres to the other side of the fan-shaped petal 501. Due to the large lateral span, the tension of the optical fiber exerts a certain compressive force on the sidewall of the fan-shaped petal 501, especially near the fiber insertion slot 505. This force is greater than the compressive force exerted by the optical fiber on the first side plate 2 or the second side plate 201. Furthermore, since the demolding method of the first side plate 2 and the second side plate 201 is outward peeling, it is only subject to the adhesive force of the glue, while the fan-shaped petal 501 is pulled outward. It needs to overcome the adhesive force of the glue and the frictional force of the optical fibers 8 on both sides. Therefore, the fan-shaped petal 501 is difficult to pull out directly. Since the core petal of the second core 401 is connected to the fan-shaped petal 501 by a flat-head screw, the core petal of the second core 401 is also difficult to retract inward to close the gap.

[0044] In a preferred embodiment, the fan-shaped petal 501 has a conical outer edge portion 504 near its outer edge, and a first shell 502 and a second shell 503 that can be separated from the conical outer edge portion 504 are respectively provided on both sides of the conical outer edge portion 504. The first shell 502 and the second shell 503 are used to abut against the optical fiber 8.

[0045] Since the conical structure of the outer edge 504 of the conical surface does not have the frictional force of planar sliding, and the outer edge 504 of the conical surface does not directly contact the optical fiber 8, nor is there any adhesive force from the glue, the core lobe of the second core 401 easily drives the fan-shaped lobe 501 to retract inward after overcoming the adhesive force of the glue on the inner wall of the optical fiber 8. Then, due to the conical structure, a gap is generated between the first cladding 502, the second cladding 503 and the outer edge 504 of the conical surface. When under force, the first cladding 502 and the second cladding 503 can use this gap to move closer to each other, reduce the total thickness, and thus detach from the side of the optical fiber 8. Finally, after the screws of the fan-shaped lobe 501 and the second core 401 are removed, the fan-shaped lobe 501 can be pulled out from the outside.

[0046] In a preferred embodiment, the outer edges of the first shell 502 and the second shell 503 are provided with hinged lugs 506, and a rotating shaft 507 is also provided, with both ends of the rotating shaft 507 hinged to each hinged lug 506.

[0047] This avoids the problem of easy loss when the first shell 502 and the second shell 503 are completely separated.

[0048] Because the hinge axis is at the outer edge, when the first shell 502 and the second shell 503 are pinched with fingers, the distance from the hinge axis is close and the power arm is short. The resistance wall at the bonding position between the optical fiber 8 and the first shell 502 and the second shell 503 is long. Therefore, after increasing the hinge point, even if the outer edge of the conical surface 504 is retracted, it is difficult to detach from the frameless ring 7 by squeezing the first shell 502 and the second shell 503 from the outer edge.

[0049] In a preferred embodiment, the outer edge of the conical surface 504 is provided with conical grooves 508 on both sides. One end of the conical groove 508 near the outer edge of the outer edge of the conical surface 504 is provided with an inner hook portion 509. The first shell 502 and the second shell 503 are provided with an outer hook portion 510 near the inner edge of the fan-shaped petal 501. The outer hook portion 510 is located in the conical groove 508. The outer edge of the conical surface 504 is retracted inward so that the inner hook portion 509 hooks the outer hook portion 510 and moves obliquely inward.

[0050] The first shell 502 and the second shell 503 are relatively thin and have a certain elastic deformation capability. When the ring is wound, the outer hook 510 abuts against the bottom of the conical groove 508. Since the conical groove 508 has a conical bottom surface, after the ring is wound, the outer edge of the conical surface 504 shrinks inward toward the axis of the frameless double-ring forming tool 1. The conical surface gradually separates from the abutting surface of the outer hook 510. The gap between the outer hook 510 and the bottom surface of the conical groove 508 gradually increases, allowing the outer hook 510 to deform toward the outer edge of the conical surface 504. At this time, the inner hook 509 gradually hooks the outer hook 510 and pulls the outer hook 510 inward so that the first shell 502 and the second shell 503 are away from the end of the rotating shaft 507 and first separate from the optical fiber 8. The lever arm is long and it is relatively easy to exert force. The inclined inward pull does not need to overcome the friction force. Therefore, when the outer edge of the conical surface 504 shrinks inward, the first shell 502 and the second shell 503 are naturally peeled off the optical fiber 8 together, and no separate operation is required.

[0051] After removing the flat-head screws between the fan-shaped petal 501 and the second core 401, you can pinch the outer sides of the first shell 502 and the second shell 503, and the inner hook 509 hooks the outer hook 510 to pull out the fan-shaped petal 501 as well, which is very convenient.

[0052] Example 2: A frameless double-loop method is disclosed, implemented through a loop winding device. The fiber optic loop is formed by winding two fibers of equal length. The loop winding device includes a loop winding fixture, a No. 1 loop fiber placement reel device, and a No. 2 loop fiber placement reel device. Furthermore, when the No. 1 loop is wound in direction A, the fibers in direction B and the No. 2 loop can be installed and fixed without interference during the winding process. Moreover, when the No. 1 and No. 2 loops are wound alternately, the winding process of the No. 1 and No. 2 loop fibers does not interfere with each other. The fiber optic loop winding method includes the following steps: The (A1, B1) fibers wound on the No. 1 loop fiber placement reel and the (A2, B2) fibers wound on the No. 2 loop fiber placement reel are cross-wound onto the loop winding fixture. This loop winding method can achieve cross-eight-pole symmetrical winding, ensuring the symmetry of the fiber optic transmission path and thus improving the accuracy of the fiber optic gyroscope.

[0053] 1. Double-wrap method The dual-polarization fiber optic gyroscope assembled in this ring exhibits comparable zero-bias stability in high and low temperature variable environments as it does in normal temperature environments.

[0054] The fiber optic ring is made by winding two optical fibers of equal length. Fiber 1 is ring number 1, and fiber 2 is ring number 2. The winding fixture is divided by a central baffle, with ring number 1 on the left and ring number 2 on the right. The winding method is achieved by a winding device, which includes a winding fixture, a fiber feeding tray for ring number 1, and a fiber feeding tray for ring number 2.

[0055] 1.1 The looping method includes the following steps: Prepare two optical fibers of corresponding ring lengths, and split them into two fiber distribution trays of ring 1 and ring 2 with equal lengths after rewinding. Label the two rewinding and split optical fibers respectively, labeling the two fiber distribution trays of ring 1 as A1 and B1, and the fiber distribution trays of ring 2 as A2 and B2; The winding tension during the process of winding the optical fiber coiled on the No. 1 ring fiber feeding tray and the optical fiber coiled on the No. 2 ring fiber feeding tray onto the winding fixture is 5g. While the optical fibers coiled on the No. 1 and No. 2 ring fiber coils are wound onto the winding fixture, glue is also applied evenly to the optical fibers.

[0056] 1.2 The process of winding optical fiber onto a loop fixture includes the following steps: Remove the No. 1 fiber guide reel and install B1 on the pay-off shaft of the winding machine, while installing A1 on the fixed fiber guide reel device. Adjust the fiber inlet angle of the No. 1 ring B1 so that the fiber on the B1 fiber guide reel is tangent to the center baffle of the winding fixture's bearing shaft. The line connecting this tangent point and the center of the winding fixture is the designated standard line for winding the No. 1 fiber. Wind the first layer of fiber of the No. 1 fiber ring in the first rotation direction, starting from the groove of the center baffle of the frame and moving towards the left bearing surface of the frame, ending at the left side wall of the fiber ring frame. Then remove the B1 fiber guide reel from the pay-off shaft of the winding machine and install it on the fixed fiber guide reel device.

[0057] Remove the No. 2 fiber guide reel. Install A2 on the pay-off shaft of the winding machine, and install B2 on the fixed fiber guide reel device. Adjust the fiber inlet angle of the No. 2 ring A2 so that the fiber on the A2 fiber guide reel is tangent to the center baffle of the winding fixture's bearing shaft. The line connecting this tangent point and the center of the winding fixture is the designated standard line for winding the No. 2 fiber. Wind the first layer of fiber of the No. 2 fiber ring in the first rotation direction from the groove of the center baffle of the frame towards the right bearing surface of the frame, ending at the right side wall of the fiber ring frame. Then remove the A2 fiber guide reel from the pay-off shaft of the winding machine and install it on the fixed fiber guide reel device.

[0058] Remove the A1 fiber guide reel from the fixed fiber guide reel device, pass it through the groove of the center baffle of the winding fixture, and install it onto the pay-off shaft of the winding machine. Adjust the fiber inlet angle of ring A1 so that the fiber on the A1 fiber guide reel is tangent to the center baffle of the winding fixture. This tangency point is located on the planned standard line for winding ring 2. Following the second rotation direction of ring 1, wind the second layer of fiber from the groove of the center baffle of the skeleton towards the right side of the skeleton, ending at the right wall of the skeleton. Keeping the end point of the second layer winding of ring 1 unchanged, wind the third layer of fiber from the right side of the skeleton's winding surface according to the third rotation direction of ring 1, ending at the groove of the center baffle of the winding fixture. Then remove the A1 fiber guide reel from the pay-off shaft of the winding machine and install it on the fixed fiber guide reel device.

[0059] Remove the B2 fiber guide tray fixed to the fiber guide tray device, pass it through the groove of the center baffle of the winding fixture, and install it onto the pay-off shaft of the winding machine. Adjust the fiber inlet angle of ring B2 so that the fiber on the B2 fiber guide tray is tangent to the center baffle of the winding fixture, with this tangency point located on the planned standard line for winding the fiber of ring 1. Wind the second layer of fiber of ring 2 in the second rotation direction from the groove of the center baffle of the skeleton towards the left side of the skeleton, ending at the left wall of the fiber ring skeleton. Keeping the end point of the second layer winding of ring 2 unchanged, wind the third layer of fiber of ring 2 in the third rotation direction from the left side of the skeleton's bearing surface, ending at the groove of the center baffle of the winding fixture. Then remove the B2 fiber guide tray from the pay-off shaft of the winding machine and install it on the fixed fiber guide tray device.

[0060] Install the B1 fiber guide disc from the fixed fiber guide disc device onto the pay-off shaft of the winding machine. Adjust the fiber inlet angle of ring B1 so that the fiber on the B1 fiber guide disc is tangent to the left side of the frame winding surface. This tangency point is located at the end point of the first layer of the first fiber ring, corresponding to the designated standard line of the first fiber ring. Wind the fourth layer of fiber of ring 1 from the left side of the frame winding surface in the fourth rotation direction of ring 1, ending at the center baffle groove of the winding shaft of the fiber ring tooling. Then remove the B1 fiber guide disc from the pay-off shaft of the winding machine and install it on the fixed fiber guide disc device.

[0061] Install the A2 fiber guide disc from the fixed fiber guide disc device onto the pay-off shaft of the winding machine. Adjust the fiber inlet angle of ring A2 so that the fiber on the A2 fiber guide disc is tangent to the right side of the frame's winding surface. This tangency point is located at the end point of the first layer of the No. 2 fiber ring, corresponding to the designated standard line of the No. 2 fiber ring. Wind the fourth layer of fiber of the No. 2 ring in the reverse direction from the right side of the frame's winding surface, following the fourth rotation direction of the No. 2 ring, ending at the center baffle slot of the winding shaft of the fiber ring tooling. Keeping the end point of the fourth layer of winding of the No. 2 ring unchanged, remove the A2 fiber guide disc from the pay-off shaft of the winding machine, pass it through the center baffle slot of the winding shaft of the winding tooling, and then install the A2 fiber guide disc onto the pay-off shaft of the winding machine. Adjust the fiber inlet angle of ring A2 so that the fiber on the A2 fiber guide disc is tangent to the center baffle of the winding shaft of the winding tooling. This tangency point is located on the designated standard line for the winding of the No. 1 fiber ring. Following the fifth rotation direction of ring 2, wind the fifth layer of fiber from the center baffle slot of the frame towards the left side of the frame, ending at the left wall of the fiber ring frame. Then remove the A2 fiber guide disc from the winding machine's pay-off shaft and install it on the fixed fiber guide disc device.

[0062] Thread the B1 fiber guide disc from the fixed fiber guide disc device through the groove of the center baffle of the winding fixture and install it onto the pay-off shaft of the winding machine. Adjust the fiber inlet angle of ring B1 so that the fiber on the B1 fiber guide disc is tangent to the center baffle of the winding fixture. This tangency point is located on the planned standard line for winding ring 2. Wind the fifth layer of fiber for ring 1 from the groove of the center baffle of the frame towards the right side of the frame, following the fifth rotation direction of ring 1. The winding ends at the right side wall of the fiber ring frame. Then remove the B1 fiber guide disc from the pay-off shaft of the winding machine and install it on the fixed fiber guide disc device.

[0063] Remove the A1 fiber guide reel from the fixed fiber guide reel device, pass it through the groove of the center baffle of the winding fixture, and install it onto the pay-off shaft of the winding machine. Adjust the fiber inlet angle of ring A1 so that the fiber on the A1 fiber guide reel is tangent to the center baffle of the winding fixture. The line connecting this tangent point and the axis of the winding fixture is the standard line for winding the No. 1 fiber. Following the sixth rotation direction of ring 1, wind the sixth layer of fiber from the groove of the center baffle of the skeleton towards the left side of the skeleton, ending at the left wall of the fiber ring skeleton. Keeping the end point of the sixth layer of winding unchanged, wind the seventh layer of fiber from the left side of the skeleton's winding surface according to the seventh rotation direction of ring 1, ending at the groove of the center baffle of the winding fixture. Then remove the A1 fiber guide reel from the pay-off shaft of the winding machine and install it on the fixed fiber guide reel device.

[0064] Remove the B2 fiber guide reel from the fixed fiber guide reel device, pass it through the groove of the center baffle of the winding fixture, and install it onto the pay-off shaft of the winding machine. Adjust the fiber inlet angle of ring B2 so that the fiber on the B2 fiber guide reel is tangent to the center baffle of the winding fixture. This tangency point is located on the planned standard line for winding ring B2. Following the sixth rotation direction of ring B2, wind the sixth layer of fiber for ring B1 from the groove of the center baffle of the skeleton towards the right side of the skeleton, ending at the right wall of the skeleton. Keeping the end point of the sixth layer winding of ring B2 unchanged, wind the seventh layer of fiber for ring B2 from the right side of the skeleton's winding surface in the seventh rotation direction of ring B2, ending at the groove of the center baffle of the winding fixture. Then remove the B2 fiber guide reel from the pay-off shaft of the winding machine and install it on the fixed fiber guide reel device.

[0065] Install the B1 fiber guide disc from the fixed fiber guide disc device onto the pay-off shaft of the winding machine. Adjust the fiber inlet angle of ring B1 so that the fiber on the B1 fiber guide disc is tangent to the right side of the frame winding surface. This tangency point is located at the end point of the first layer of the first fiber ring, corresponding to the designated standard line of the first fiber ring. Wind the eighth layer of fiber of ring 1 from the right side of the frame winding surface in the eighth rotation direction of ring 1, ending at the center baffle groove of the winding shaft of the fiber ring tooling. Then remove the B1 fiber guide disc from the pay-off shaft of the winding machine and install it on the fixed fiber guide disc device.

[0066] Install the A2 fiber guide disc from the fixed fiber guide disc device onto the pay-off shaft of the winding machine. Adjust the fiber inlet angle of ring A2 so that the fiber on the A2 fiber guide disc is tangent to the left side of the frame winding surface. This tangency point is located at the end of the first layer of the No. 2 fiber ring, corresponding to the designated standard line of the No. 2 fiber ring. Wind the eighth layer of fiber of the No. 2 ring in the opposite direction from the left side of the frame winding surface according to the eighth rotation direction of the No. 2 ring, ending at the center baffle groove of the winding shaft of the fiber ring tooling.

[0067] Repeat the above steps until the fiber optic loop is completed. The total number of layers of the fiber optic loop should be an integer multiple of 8.

[0068] 2. Tooling Design: To address the requirements of the aforementioned winding method, the following winding fixture was designed and developed, mainly including components such as the C-side fixture side plate, the C-side fixture core, the intermediate auxiliary partition, the D-side fixture side plate, the D-side fixture core, locating pins, and screws. Figure 1 As shown; The positioning pins are used to achieve precise splicing of multi-lobed structures, ensuring the assembly gap, dimensional accuracy and positional tolerance of the winding tooling; The C and D side tooling cores are the fiber bearing surfaces. After the A side is wound, the fiber passes through the fiber threading gap on the intermediate auxiliary partition and continues to be wound on the D side tooling core. The above actions are repeated according to the set winding method. The intermediate auxiliary partition is used to isolate the C and D fiber rings, ensuring the smooth arrangement of the fibers during the winding of the C and D fibers, and finally forming the desired shape.

[0069] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A frameless double-ring winding device for a fiber optic rotating seismograph, characterized in that: The fixture includes a rotatable frameless double-wrap tooling (1), and also includes a first fiber first splitting disk (10), a first fiber second splitting disk (1001), a second fiber first splitting disk (11), and a second fiber second splitting disk (1101). Three of the first fiber first splitting disk (10), the first fiber second splitting disk (1001), the second fiber first splitting disk (11), and the second fiber second splitting disk (1101) rotate synchronously with the frameless double-wrap tooling (1). The other one of the first fiber first splitting disk (10), the first fiber second splitting disk (1001), the second fiber first splitting disk (11), and the second fiber second splitting disk (1101) is fixed in one position so that the optical fiber is wound around the frameless double-wrap tooling (1) from the middle. The frameless double-wrap tooling (1) includes a first core (4) and a second core (401) arranged side by side. An intermediate auxiliary partition (5) is provided between the first core (4) and the second core (401). A first side plate (2) and a second side plate (201) are respectively provided on the outer side of the first core (4) and the second core (401). Multiple fiber-threading slots (505) are provided on the outer edge of the intermediate auxiliary partition (5). The optical fiber is wound alternately between the first core (4) and the second core (401) through the fiber-threading slots (505). The first core (4) and the second core (401) each include two semi-cylindrical core petals. The planar side of each core petal is detachably connected to each side plate. The two core petals of the same core are spliced ​​together to form a complete cylindrical shape. There is a gap between the core petals. The intermediate auxiliary partition (5) includes multiple circumferentially arranged fan-shaped petals (501). The fan-shaped petals (501) are detachably connected to the core petals of the first core (4) or the second core (401).

2. The frameless double-ring winding device for a fiber optic rotating seismograph according to claim 1, characterized in that: It is also provided with at least four positioning pins (6), each positioning pin (6) passing through the first side plate (2) and the first core (4) to be inserted into the second core (401).

3. The winding device and method for a frameless double-ring for a fiber optic rotating seismograph according to claim 1, characterized in that: A conical filler plate (402) is provided in the gap between the core petals. One end of the conical filler plate (402) is flush with the cylindrical surface of the core petal. The thickness of the conical filler plate (402) near the outer edge of the first core (4) is less than the thickness away from the outer edge of the first core (4).

4. The frameless double-ring winding device for a fiber optic rotating seismograph according to claim 2 or 3, characterized in that: The fan-shaped petal (501) has a conical outer edge (504) near its outer edge. A first shell (502) and a second shell (503) that can be separated from the conical outer edge (504) are respectively provided on both sides of the conical outer edge (504). The first shell (502) and the second shell (503) are used to abut against the optical fiber (8).

5. The frameless double-ring winding device for a fiber optic rotating seismograph according to claim 4, characterized in that: The outer edges of the first shell (502) and the second shell (503) are provided with hinged lugs (506) and a rotating shaft (507), with both ends of the rotating shaft (507) hinged to each hinged lug (506).

6. The frameless double-ring winding device for a fiber optic rotating seismograph according to claim 5, characterized in that: The outer edge of the cone surface (504) is provided with cone grooves (508) on both sides. The cone groove (508) is provided with an inner hook (509) at one end near the outer edge of the outer edge of the cone surface (504). The first shell (502) and the second shell (503) are provided with an outer hook (510) at one end near the inner edge of the fan-shaped petal (501). The outer hook (510) is located in the cone groove (508). The outer edge of the cone surface (504) is retracted so that the inner hook (509) hooks the outer hook (510) and moves obliquely inward.

7. A method for manufacturing a frameless double-ring winding device for a fiber optic rotating seismograph according to claim 1, characterized in that: The first and second optical fibers are wound from the center. The first half of the first optical fiber starts from the middle auxiliary partition (5) in the middle of the frameless double-wrap tooling (1) and is arranged in a right-hand spiral towards the first outer side. The first half of the second optical fiber starts from the middle auxiliary partition (5) and is arranged in a right-hand spiral towards the second outer side, forming the first layer of optical fiber. The second half of the first optical fiber passes through the fiber-threading slot (505) and is arranged in a right-hand spiral from the middle auxiliary partition (5) to the second outer side. The second half of the second optical fiber passes through the fiber-threading slot (505) and is arranged in a right-hand spiral from the middle auxiliary partition (5) to the first outer side, forming the second layer of optical fiber. The second half of the first optical fiber is arranged in a left-hand spiral from the second outer side plate of the frameless double-wrap tooling (1) towards the center, forming the third layer of optical fiber. The first half of the first optical fiber is arranged in a left-hand spiral from the outermost side plate of the frameless double-wrap tooling (1) towards the center, and the first half of the second optical fiber is arranged in a left-hand spiral from the outermost side plate of the frameless double-wrap tooling (1) towards the center, forming the fourth layer of optical fiber. The first half of the first optical fiber passes through the fiber-threading slot (505) and is arranged in a left-hand spiral from the middle auxiliary partition (5) to the second outer side. The first half of the second optical fiber passes through the fiber-threading slot (505) and is arranged in a left-hand spiral from the middle auxiliary partition (5) to the first outer side, forming the fifth layer of optical fiber. The second half of the first optical fiber passes through the fiber-threading slot (505) and is arranged outward in a left-hand spiral starting from the middle auxiliary partition (5). The second half of the second optical fiber passes through the fiber-threading slot (505) and is arranged outward in a left-hand spiral starting from the middle auxiliary partition (5), forming the sixth layer of optical fiber. The second half of the first optical fiber is arranged in a right-hand spiral from the outermost side plate towards the center, and the second half of the second optical fiber is arranged in a right-hand spiral from the outermost side plate towards the center, forming the seventh layer of optical fiber. The first half of the first optical fiber is arranged in a right-hand spiral from the second outer side plate toward the center, and the first half of the second optical fiber is arranged in a right-hand spiral from the first outer side plate toward the center, forming the eighth layer of optical fiber. During the winding process, adhesive is applied to the outer wall of the optical fiber. The above eight-layer winding method is repeated until the winding is completed. After the adhesive solidifies, the frameless double-ring winding fixture (1) is removed to obtain a frameless double-ring optical fiber ring.

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