Optical fiber grinder

Abstract

The application relates to the technical field of optical fiber processing equipment, and provides a grinding mechanism, which comprises a workbench, a sponge pad installed on the workbench, and a grinding sheet attached to the sponge pad and used for grinding an optical fiber ferrule; a lifting mechanism installed on one side of the grinding mechanism, wherein the lifting mechanism comprises a transmission rod and a lifting support arranged on the transmission rod; a sensor used for detecting the position of the optical fiber ferrule after the optical fiber ferrule is moved up and down along with the lifting support; a controller used for controlling the lifting support to move up and down; and a grinding disc used for installing the optical fiber ferrule, wherein the grinding disc is installed on the lifting support and is arranged opposite to the workbench; when the sensor detects that the optical fiber ferrule is moved to a first preset position through the lifting support, the sensor sends a feedback signal to trigger the controller to control the workbench to rotate and drive the grinding sheet to rotate, so that the optical fiber ferrule is ground. The application can play a double protection role on the grinding of the optical fiber ferrule, reduce the core cracking rate of the optical fiber ferrule in the grinding process, and reduce the manufacturing cost.

Description

Technical Field

[0001] This invention relates to the field of optical fiber processing equipment technology, and specifically to an optical fiber polishing machine. Background Technology

[0002] Fiber optic connectors can be classified according to the transmission medium into common silicon-based fiber optic single-mode and multi-mode connectors, as well as other fiber optic connectors using plastic or other materials as the transmission medium. According to the connector structure, they can be classified into various types such as FC, SC, ST, LC, D4, DIN, MU, MT, etc.

[0003] After the fiber is fixed in position by the ferrule, the fiber end face needs to be polished flat. Fiber polishing is an important step to ensure fiber quality, and the removal of adhesive during polishing is a key step. Therefore, a polishing device is required. Traditional polishing devices usually use a clamping device to hold the MPO connector, and the MPO connector end face is aligned with the polishing turntable to polish the fiber end face. For example, Chinese invention patent with publication number CN203566479U, publication date April 30, 2014, entitled "A Fiber Polishing Machine". However, such polishing devices generally use a hard worktable with polishing pads. When the support base of this material is used with polishing pads to polish the fiber, its high hardness makes it difficult to control the pressure and speed during the removal of adhesive, which leads to an increase in the fiber breakage rate and thus increases the manufacturing cost. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an optical fiber polishing machine that can effectively reduce the core cracking rate of optical fiber ferrules during the polishing process and reduce the manufacturing cost.

[0005] To address the above problems, the present invention provides the following technical solution:

[0006] An optical fiber polishing machine, comprising:

[0007] The polishing mechanism includes a worktable, a sponge pad mounted on the worktable, and a polishing disc attached to the sponge pad for polishing the fiber optic ferrule.

[0008] A lifting mechanism is installed on one side of the grinding mechanism. The lifting mechanism includes a transmission rod and a lifting bracket disposed on the transmission rod.

[0009] A sensor is used to detect the position of the optical fiber ferrule after it has moved up and down with the lifting bracket;

[0010] The controller is used to control the lifting support to rise and fall.

[0011] A polishing disc is used to install fiber optic ferrules. The polishing disc is installed on the lifting bracket and is positioned opposite the worktable.

[0012] When the sensor detects that the fiber optic ferrule has moved to a first preset position via the lifting bracket, the sensor sends a feedback signal to trigger the controller to control the worktable to rotate and drive the polishing disc to rotate, thereby polishing the fiber optic ferrule.

[0013] In the aforementioned fiber polishing machine, the sensor includes an upper sensor and a lower sensor mounted on the transmission rod;

[0014] The upper-level sensor is located on one side of the lifting bracket;

[0015] The lower-level sensor is located on the other side of the lifting bracket;

[0016] When the lower-level sensor detects that the fiber optic ferrule has moved to the first preset position through the lifting bracket, the lower-level sensor sends a feedback signal to trigger the controller to control the worktable to rotate and drive the polishing disc to rotate, thereby polishing the fiber optic ferrule.

[0017] When the upper sensor detects that the optical fiber ferrule has moved to the second preset position through the lifting bracket, the upper sensor sends a feedback signal to trigger the controller to control the worktable to stop rotating;

[0018] The second preset position is higher than the first preset position.

[0019] In the aforementioned fiber polishing machine, the first preset position is located above the polishing disc and the distance between the position and the polishing disc is between 0.3 and 0.5 mm.

[0020] The second preset position is located above the grinding disc and at a distance of ≥70mm from the grinding disc.

[0021] In the aforementioned optical fiber polishing machine, the optical fiber ferrule includes a body, a fiber tip protruding from the body, and an adhesive layer, wherein the adhesive layer is located between the fiber tip and the body;

[0022] During the first period after the worktable starts to rotate, the grinding disc first grinds the fiber head;

[0023] During the second time period after the abrasive disc finishes grinding the fiber head, the abrasive disc grinds the adhesive layer.

[0024] The first time period is 3 / 5 of the second time period.

[0025] In the aforementioned fiber polishing machine, during the polishing process of the polishing pad polishing the fiber tip and the adhesive layer, the controller controls the lifting bracket to descend, and the descent speed of the lifting bracket is between 0.1 and 0.3 mm / s.

[0026] In the aforementioned fiber polishing machine, the polishing disc includes a disc body and an extension column protruding from the center of the disc body. The lifting bracket includes an extension arm and elastic clamping portions protruding from the end of the extension arm to both sides. The extension column is inserted between the elastic clamping portions on both sides and the polishing disc is fixed by locking the elastic clamping portions with fixing screws.

[0027] In the aforementioned fiber polishing machine, the polishing disc includes a first fastener and a second fastener for clamping the fiber ferrule and abutting against the fiber ferrule, a first screw inserted into the first fastener, and a second screw inserted into the second fastener.

[0028] Both the first fastener and the second fastener are disposed on the disk body;

[0029] Tightening the first screw causes the first fastener to press the fiber optic ferrule along a first direction, and tightening the second screw causes the second fastener to press the fiber optic ferrule along a second direction.

[0030] The first direction is perpendicular to the second direction.

[0031] In the aforementioned fiber polishing machine, the disk body can be equipped with multiple fiber ferrules, and the multiple fiber ferrules are distributed on the disk body with the central axis of the disk body as the axis of symmetry.

[0032] The straight-line distance from any fiber optic ferrule installed on the disk to the central axis of the disk is ≥ 1 / 2 of the disk diameter.

[0033] In the aforementioned fiber polishing machine, the thickness of the sponge pad ranges from 15 to 30 mm.

[0034] In the aforementioned fiber polishing machine, the sponge pad is made of high-density sponge.

[0035] The beneficial effects of this invention are as follows: By setting a sensor to sense the lifting and lowering movement of the fiber optic ferrule and preset the grinding start position, when the sensor detects that the fiber optic ferrule has moved to the first preset position via the lifting bracket, the sensor sends a feedback signal to trigger the controller to control the rotation of the worktable and drive the grinding disc to rotate, thereby grinding the fiber optic ferrule. This prevents the fiber optic ferrule from continuing to descend with the lifting bracket after it has reached its position, causing the fiber tip of the ferrule to come into contact with the grinding disc and be squeezed, resulting in core cracking. At the same time, by setting a sponge pad between the worktable and the grinding disc, the impact of the hardness of the grinding disc when it comes into contact with the fiber optic ferrule during the grinding process is reduced, giving the grinding disc a certain degree of elasticity to buffer the fiber optic ferrule. Combined with the sensor, this provides dual protection for the descent of the fiber optic ferrule and the grinding process, thereby reducing the core cracking rate of the fiber optic ferrule during the grinding process and reducing manufacturing costs. Attached Figure Description

[0036] Figure 1 This is a perspective view of one embodiment of the fiber polishing machine of the present invention;

[0037] Figure 2 This is a cross-sectional view of one embodiment of the fiber polishing machine of the present invention;

[0038] Figure 3 This is an exploded view of one embodiment of the optical fiber polishing machine of the present invention;

[0039] Figure 4 for Figure 3 A schematic diagram of the structure of one embodiment of the grinding disc;

[0040] Figure 5 for Figure 4 An installation diagram of one embodiment of a fiber optic ferrule;

[0041] Figure 6 for Figure 3 A schematic diagram of one embodiment of the lifting support;

[0042] Figure 7 for Figure 5 A schematic diagram of one embodiment of a fiber optic ferrule.

[0043] Figure label:

[0044] 100. Fiber optic polishing machine; 111. Base plate; 211. Polishing mechanism; 311. Lifting mechanism; 412. Fiber optic ferrule; 411. Polishing disc; 212. Worktable; 213. Sponge pad; 214. Polishing disc; 312. Transmission rod; 313. Lifting bracket; 314. Upper sensor; 315. Lower sensor; 11a. First preset position; 11b. Second preset position; 421. Main body; 422. Fiber optic tip; 423. Adhesive layer; 431. Disc body; 432. Extension column; 321. Extension arm; 322. Elastic clamping part; 442. First fastener; 443. Second fastener; 452. First screw; 453. Second screw; 433. Handle; 511. Machine body; 512. Through hole; 513. Screw hole. Detailed Implementation

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0047] For ease of description of the first and second directions in the embodiments of this application, the first direction is the left-right direction in the accompanying drawings, and the second direction is the up-down direction in the accompanying drawings. The x-axis arrow direction is referred to as the "right" direction in the following text, and the y-axis arrow direction as the "down" direction in the following text; however, in the actual application of this application, these are not limiting.

[0048] like Figure 1 As shown, this embodiment provides an optical fiber polishing machine 100, which includes: a base plate 111 disposed at the bottom, a polishing mechanism 211 mounted on the base plate 111, a lifting mechanism 311 mounted on the base plate 111 and disposed on one side of the polishing mechanism 211, a polishing disc 411 for mounting an optical fiber ferrule 412, and a sensor and controller. It can be understood that when the optical fiber is terminated, the fiber tip 422 and the adhesive layer 423 of the optical fiber ferrule 412 must be polished to meet the standards for use. This embodiment provides an optical fiber polishing machine 100 to polish and remove the adhesive from the optical fiber ferrule 412 to be used.

[0049] Optionally, the base plate 111 is made of marble, which is quite hard.

[0050] Please refer to Figure 1-2 As shown, preferably, the polishing mechanism 211 includes a body 511 and a worktable 212 disposed in the center of the body 511, a sponge pad 213 mounted on the worktable 212, and a polishing disc 214 attached to the sponge pad 213 for polishing the fiber optic ferrule 412; further, the lifting mechanism 311 includes a transmission rod 312 and a lifting bracket 313 disposed on the transmission rod 312, and a sensor is used to detect the position of the fiber optic ferrule 412 after it moves up and down with the lifting bracket 313; even further, a controller is used to control the lifting bracket 313 to move up and down, and the polishing mechanism 211 also includes a drive motor (not labeled) disposed in the body 511, which can drive the lifting bracket 313 to move up and down along the transmission rod 312 by being electrically connected to the controller. In this embodiment, the sensors are all mounted on... The transmission rod 312 has an upper sensor 314 and a lower sensor 315. The upper sensor 314 is located on one side of the lifting bracket 313 and away from the worktable 212, while the lower sensor 315 is located on the other side of the lifting bracket 313 and close to the worktable 212. Furthermore, the polishing disc 411 is installed on the lifting bracket 313 and faces the worktable 212. Since the fiber optic ferrule 412 is installed on the polishing disc 411 and the polishing disc 411 is installed on the lifting bracket 313, the fiber optic ferrule 412 can move closer to or away from the worktable 212 as the controller controls the lifting bracket 313 to move up and down, thereby moving closer to or away from the polishing disc 214. During this process, the upper sensor 314 and the lower sensor 315 are used to detect whether the position of the fiber optic ferrule 412 after moving up and down with the lifting bracket 313 has reached the preset position.

[0051] Optionally, both the upper sensor 314 and the lower sensor 315 are set as infrared sensors.

[0052] Please refer to Figure 1-2As shown, specifically, the first preset position 11a and the second preset position 11b are set by the installation positions of the upper sensor 314 and the lower sensor 315. That is, the first preset position 11a is the position when the fiber optic ferrule 412 descends to be close to the polishing plate 214, and the lower sensor 315 is positioned horizontally on the transmission rod 312 at the first preset position 11a; the second preset position 11b is the position when the fiber optic ferrule 412 rises to be away from the polishing plate 214 and separated from the polishing plate 214 by a fixed distance, and the upper sensor 314 is positioned horizontally on the transmission rod 312 at the second preset position 11b. The lifting position of the fiber optic ferrule 412 is sensed and detected by the infrared signal feedback speed, and the second preset position 11b is higher than the first preset position 11a. It can be understood that when the lower sensor 315 detects that the fiber optic ferrule 412 has moved to the first preset position 11a by the lifting bracket 313, the lower sensor 315 transmits a feedback signal to the controller, and the controller controls the worktable 2. The 12 rotates and drives the polishing disc 214 to rotate, thereby polishing the fiber optic ferrule 412. This structure is designed to prevent the fiber optic ferrule 412 from continuing to descend after it has reached its lower position during the descent of the lifting bracket 313. This would cause the fiber tip 422 of the fiber optic ferrule 412 to come into contact with the polishing disc 214 and be squeezed, resulting in core cracking. This reduces the core cracking rate of the fiber optic ferrule 412 during the polishing process. Furthermore, after the polishing disc 214 has finished polishing the fiber optic ferrule 412, the controller controls the lifting bracket 313 to rise automatically. When the upper sensor 314 detects that the fiber optic ferrule 412 has moved to the second preset position 11b through the lifting bracket 313, the upper sensor 314 transmits a feedback signal to the controller. The controller then controls the worktable 212 to stop rotating. The user can then remove the polishing disc 411 from the lifting bracket 313, take out the polished fiber optic ferrule 412 from the polishing disc 411, and can reinstall the fiber optic ferrule 412 that needs polishing or stop the fiber polishing machine 100 from operating.

[0053] like Figure 3As shown, in the above scheme, the thickness L1 of the sponge pad 213 is set between 15 and 30 mm. In this embodiment, the sponge pad 213 is adapted to the worktable 212, with a length L2 of 130 mm and a thickness of 20 mm. The sponge pad 213 is made of high-density sponge (high-density sponge is sponge with a weight of more than 25 kg per cubic meter). By setting the sponge thickness range, the sponge is adapted to the worktable 212 during the grinding process, avoiding the situation where the fiber optic ferrule 412 cracks during the grinding process due to the sponge pad 213 being too thick or too thin. At the same time, by selecting high-density sponge for the sponge pad 213, the sponge has both good softness and a certain degree of rigidity and weight, ensuring that the sponge pad 213 has good support force when supporting the grinding disc 214, and also ensuring that the sponge pad 213 has good stability when rotating with the worktable 212.

[0054] Optionally, the abrasive pad 214 in this embodiment is made of abrasive sandpaper.

[0055] Please refer to Figure 2 As shown, in the above scheme, the first preset position 11a is located above the polishing plate 214 and the distance between the first preset position 11a and the polishing plate 214 is between 0.3 and 0.5 mm. That is, when the fiber optic ferrule 412 descends to a distance between it and the polishing plate 214 within this distance range, the lower-level sensor 315 can detect the fiber optic ferrule 412 and send a signal to the controller to issue a command to the worktable 212. Further, the second preset position 11b is located above the polishing plate 214 and the distance between it and the polishing plate 214 is L3 ≥ 70 mm. That is, when the polishing disc 411 rises to a distance between it and the polishing plate 214 exceeding 70 mm, the second preset position 11b is located above the polishing plate 214 and the distance between it and the polishing plate 214 is L3 ≥ 70 mm. At 70mm, the user can remove the grinding disc 411 from the lifting bracket 313. This distance range makes it easy for the user to install or remove the grinding disc 411, so as to avoid the distance between the grinding disc 411 and the sandpaper being too small, which could cause the fiber optic ferrule 412 to crack when the grinding disc 411 is installed or removed. In this embodiment, the farthest distance between the fiber optic ferrule 412 and the grinding disc 214 is set to 70mm, but it is not limited to this. The installation position of the upper sensor 314 on the transmission rod 312 changes with the change of the second preset position 11b, and always remains flush with the second preset position 11b.

[0056] like Figure 7As shown, preferably, the fiber optic ferrule 412 includes a body 421, a fiber tip 422 protruding from the body 421, and an adhesive layer 423. The adhesive layer 423 is located between the fiber tip 422 and the body 421. Before actually using the fiber optic ferrule 412, the user needs to grind both the fiber tip 422 and the adhesive layer 423. When the lower position sensor 315 triggers the worktable 212 to rotate through the controller to grind the fiber optic ferrule 412, the lifting bracket 313 slowly descends as the worktable 212 rotates.

[0057] According to the above scheme, during the first period after the worktable 212 starts to rotate, the grinding disc 214 first grinds the fiber head 422. During the second period after the grinding disc 214 finishes grinding the fiber head, the grinding disc 214 then grinds the adhesive layer 423 as the lifting bracket 313 descends.

[0058] The first period is 3 / 5 of the second period.

[0059] In the above scheme, it is understood that by presetting the first time period and the second time period by the controller, and setting the first time period to account for 3 / 5 of the second time period, the fiber optic connector 422 and the adhesive layer 423 are fully polished by the polishing disc 214 within the specified time period. This avoids insufficient polishing of the fiber optic connector during the polishing process, which would result in failure to meet the actual use standard, and also avoids excessive polishing that would cause core cracking. In this embodiment, the first time period is 8s, the second time period is 3s, and the third time period is 5s. After the first time period ends, the controller controls the lifting bracket 313 to rise through a preset process, thereby moving the fiber optic ferrule 412 to the second preset position 11b. In another embodiment, the first time period and the second time period can also vary according to the different thicknesses of the fiber optic connector 422 and the adhesive layer 423, which is not limited here.

[0060] During the grinding process of the grinding disc 214 grinding the fiber tip 422 and the adhesive layer 423, the controller controls the lifting bracket 313 to descend as the worktable 212 rotates through the drive motor. The descent speed of the lifting bracket 313 is set to be between 0.1 and 0.3 mm / s. That is, when the descent speed of the lifting bracket 313 is within this speed range, it can ensure that the fiber tip 422 and the adhesive layer 423 of the fiber optic ferrule 412 are fully ground, avoiding insufficient grinding or core cracking caused by descent that is too fast or too slow.

[0061] Please refer to Figure 3 and Figure 6As shown, preferably, the grinding disc 411 includes a disc body 431 and an extension post 432 protruding from the center of the disc body 431. The lifting bracket 313 includes an extension arm 321 and elastic clamping portions 322 protruding from the ends of the extension arm 321 to both sides. Through holes 512 are formed by recesses on the opposite sidewalls of the elastic clamping portions 322 on both sides. The extension post 432 can be inserted into the through holes 512 between the elastic clamping portions 322 on both sides. When the grinding disc 411 is installed on the lifting bracket 313, the screw holes 513 on the elastic clamping portions 322 on both sides are locked by fixing screws to reduce the through holes 512 and tighten the extension post 432, so that the lifting bracket 313 fixes the grinding disc 411. When the grinding disc 411 is removed from the lifting bracket 313, it is removed by screwdriver.

[0062] Loosening the fixing screw locked in the screw hole 513 allows the elastic clamping part 322 to return to its initial state, and the grinding disc 411 can then be easily removed.

[0063] like Figure 4 As shown, optionally, the grinding disc 411 also includes a handle 433 protruding to one side from the extension post 432, by which the user installs or removes the grinding disc 411.

[0064] Please refer to Figure 4-5 As shown, preferably, the polishing disc 411 includes a first fastener 442 and a second fastener 443 for clamping fiber optic ferrules 442 and abutting against each other, a first screw 452 for inserting into the first fastener 442, and a second screw 453 for inserting into the second fastener 443. The first fastener 442 and the second fastener 443 are both movably disposed on the disc body 431. In this embodiment, the disc body 431 can accommodate multiple fiber optic ferrules 412, thereby setting the number of first fasteners 442, second fasteners 443, first screws 452, and second screws 453 to match the number of fiber optic ferrules. It is understood that when multiple fiber optic ferrules 412 are each installed on the disc body 431 for polishing, tightening the first screw 452 causes the first fastener 4442 to press against the fiber optic ferrule 412 in a first direction, and tightening the second screw 453 causes the second fastener 443 to press against the fiber optic ferrule 412 in a first direction.

[0065] The fiber ferrule 412 is pressed along the second direction. In this embodiment, the first direction is perpendicular to the second direction, so that the fiber ferrule 412 is subjected to force in both the horizontal and vertical directions, thereby fixing it on the disk body 431. This ensures the stability of the fiber ferrule 412 during the polishing process and prevents core cracking. Conversely, after the polishing of multiple fiber ferrules 412 is completed, after the polishing disk 411 rises to the second preset position 11b and is removed from the lifting bracket 313, the first screw 452 and the second screw 453 are twisted in the opposite direction to allow the fiber ferrule to be pressed firmly.

[0066] The fiber ferrule 412 is loosened on the disc 431, making it easy to remove the polished fiber ferrule 412.

[0067] like Figure 4 As shown, in the above scheme, multiple fiber optic ferrules 412 are distributed on the disk 431 with the central axis of the disk 431 as the axis of symmetry, and any fiber optic ferrule 412 installed on the disk 431 can be distributed on the disk 431.

[0068] The straight-line distance L4 of the central axis is greater than or equal to half the diameter L5 of the disk body 431. This structure aims to make the fiber optic ferrules 4125 arranged on the disk body 431 as close as possible to the periphery of the disk body 431, thereby allowing the fiber optic ferrules 4125 to be arranged in the same space.

[0069] The number of units installed at intervals should be as large as possible to ensure that the grinding efficiency of the single grinding mechanism 211 is at a high level.

[0070] In summary, this invention provides an optical fiber polishing machine. By incorporating sensors to detect the lifting and lowering movement of the optical fiber ferrule and preset the polishing start position, the sensor sends a feedback signal when it detects that the optical fiber ferrule has moved to the first preset position via the lifting bracket. This triggers the controller to rotate the worktable, causing the polishing pad to rotate and polish the optical fiber ferrule. This prevents the optical fiber ferrule from continuing to descend after reaching its designated position, causing the fiber tip to come into contact with the polishing pad and resulting in cracking. Simultaneously, by placing a sponge pad between the worktable and the polishing pad, the impact of the hardness of the polishing pad when in contact with the optical fiber ferrule during polishing is reduced. This provides the polishing pad with a certain degree of elasticity, cushioning the optical fiber ferrule. Combined with the sensor, this provides dual protection for the descent of the optical fiber ferrule and the polishing process, thereby reducing the cracking rate of the optical fiber ferrule during polishing and lowering manufacturing costs.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An optical fiber polishing machine, characterized in that, include: The polishing mechanism includes a worktable, a sponge pad mounted on the worktable, and a polishing disc attached to the sponge pad for polishing the fiber optic ferrule. A lifting mechanism is installed on one side of the grinding mechanism. The lifting mechanism includes a transmission rod and a lifting bracket disposed on the transmission rod. A sensor is used to detect the position of the optical fiber ferrule after it has moved up and down with the lifting bracket; The controller is used to control the lifting support to rise and fall. A polishing disc is used to install fiber optic ferrules. The polishing disc is installed on the lifting bracket and is positioned opposite the worktable. When the sensor detects that the fiber optic ferrule has moved to a first preset position via the lifting bracket, the sensor sends a feedback signal to trigger the controller to control the worktable to rotate and drive the polishing disc to rotate, thereby polishing the fiber optic ferrule. The sensor includes an upper sensor and a lower sensor mounted on the transmission rod; The upper-level sensor is located on one side of the lifting bracket; The lower-level sensor is located on the other side of the lifting bracket; When the lower-level sensor detects that the optical fiber ferrule has moved to the first preset position through the lifting bracket, the lower-level sensor sends a feedback signal to trigger the controller to control the worktable to rotate and drive the polishing disc to rotate, thereby polishing the optical fiber ferrule; When the upper sensor detects that the optical fiber ferrule has moved to the second preset position through the lifting bracket, the upper sensor sends a feedback signal to trigger the controller to control the worktable to stop rotating; The second preset position is higher than the first preset position.

2. The optical fiber polishing machine according to claim 1, characterized in that: The first preset position is located above the grinding disc and the distance between the position and the grinding disc is between 0.3 and 0.5 mm. The second preset position is located above the grinding disc and at a distance of ≥70mm from the grinding disc.

3. The optical fiber polishing machine according to claim 1, characterized in that: The optical fiber ferrule includes a body, a fiber tip protruding from the body, and an adhesive layer, wherein the adhesive layer is located between the fiber tip and the body; During the first period after the worktable starts to rotate, the grinding disc first grinds the fiber head; During the second time period after the abrasive disc finishes grinding the fiber head, the abrasive disc grinds the adhesive layer. The first time period is 3 / 5 of the second time period.

4. The optical fiber polishing machine according to claim 3, characterized in that: During the grinding process of the grinding disc grinding the fiber head and the adhesive layer, the controller controls the lifting bracket to descend, and the descent speed of the lifting bracket is between 0.1 and 0.3 mm / s.

5. The optical fiber polishing machine according to claim 1, characterized in that: The grinding disc includes a disc body and an extension column protruding from the center of the disc body. The lifting bracket includes an extension arm and elastic clamping parts protruding from the end of the extension arm to both sides. The extension column is inserted between the elastic clamping parts on both sides and the elastic clamping parts are locked by fixing screws to fix the grinding disc.

6. The optical fiber polishing machine according to claim 5, characterized in that: The grinding disc includes a first fastener and a second fastener for clamping the optical fiber ferrule and abutting against the optical fiber ferrule, a first screw inserted into the first fastener, and a second screw inserted into the second fastener. Both the first fastener and the second fastener are disposed on the disk body; Tightening the first screw causes the first fastener to press the fiber optic ferrule along a first direction, and tightening the second screw causes the second fastener to press the fiber optic ferrule along a second direction. The first direction is perpendicular to the second direction.

7. The optical fiber polishing machine according to claim 6, characterized in that: The disk body can be equipped with multiple fiber optic ferrules, and the multiple fiber optic ferrules are distributed on the disk body with the central axis of the disk body as the axis of symmetry. The straight-line distance from any fiber optic ferrule installed on the disk to the central axis of the disk is ≥ 1 / 2 of the diameter of the disk.

8. The optical fiber polishing machine according to claim 1, characterized in that: The thickness of the sponge pad is between 15 and 30 mm.

9. The optical fiber polishing machine according to claim 1, characterized in that: The sponge pad is made of high-density sponge.

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