Optical fiber grinding precision positioning tool clamp

Abstract

The application discloses a fiber grinding precision positioning tool clamp and belongs to the technical field of fiber grinding, which comprises a grinding equipment body, elastic positioning blocks, positioning springs and a positioning clamp assembly. The positioning clamp assembly comprises a downward pressing locking mechanism, a fiber clamping mechanism and a circulating inclined pressing mechanism. When the fiber clamping mechanism moves downward, the circulating inclined pressing mechanism is driven to press the inclined surface at the top of the elastic positioning block with the working section of the conveying belt, so that the elastic positioning block is close to the fiber to be ground, and the inclined block is matched with the locking rack to keep the downward pressing position. The circulating inclined pressing mechanism is provided with an inclined surface bearing plate, a conveying roller, a conveying belt, an indexing driving rod, a ratchet wheel and a ratchet pawl, and can switch the contact area in one direction. A dust suction cleaning assembly forms a negative pressure path through a floating support plate, a guide column, a toothed rack, a hollow ball head, a suction pipe and a dust suction cover, and can suck and clean the surface of the working section. The application can reduce the influence of positioning retreat and particle residues during continuous grinding, and improve the clamping and positioning stability.

Description

Technical Field

[0001] This invention belongs to the field of optical fiber polishing technology, and particularly relates to a precision positioning fixture for optical fiber polishing. Background Technology

[0002] After assembly, fiber optic connectors, fiber optic ferrules, and other similar components typically require end-face grinding to achieve a state that meets subsequent connection and usage requirements. In this process, the fiber to be ground must first be positioned within the grinding equipment's workstation, and then its end must maintain a specified contact relationship with the grinding surface. Unlike the short-term clamping of ordinary parts, fiber optics or fiber ferrules are relatively small. During the continuous end-face grinding process, the clamping position repeatedly experiences friction from the grinding surface. Therefore, the holding state after clamping directly affects the positional consistency during grinding.

[0003] To balance ease of installation and adaptability to workpieces of different sizes, some existing fiber optic polishing fixtures incorporate an elastic element between the positioning component and the fixture body. This allows the positioning component to move within a certain range and uses elasticity to press the fiber or fiber ferrule into a predetermined position. This structure provides some clearance during the installation phase and facilitates the positioning component maintaining clamping force after contacting the workpiece. However, in specific applications involving continuous end-face polishing of fibers or fiber ferrules, if the positioning component relies primarily on the elastic element to maintain its position after reaching the clamping position, the periodic frictional force exerted by the polishing surface on the workpiece, the minute vibrations generated by the equipment operation, and the changes in the contact reaction force between the workpiece and the clamping surface can all be transmitted through the workpiece to the positioning component, causing the elastic element to undergo corresponding slight compression or rebound.

[0004] For clamping scenarios where only preventing workpieces from falling off is required, the aforementioned slight displacement usually does not affect normal use. However, in the case of precision grinding of fiber end faces, the workpiece needs to maintain a relatively fixed spatial position throughout the grinding process. When the positioning component retracts slightly with the change of load, the force state and positional relationship of the fiber or fiber ferrule relative to the grinding surface will also change. In the continuous processing process, there may also be inconsistencies in the clamping state between different workpieces. Summary of the Invention

[0005] The purpose of this invention is to provide a precision positioning fixture for optical fiber polishing, which solves the technical problem in the prior art where, during continuous polishing of the end face of an optical fiber ferrule, the positioning component is easily affected by polishing friction load and vibration, resulting in slight retraction and thus insufficient stability of the clamping position of the optical fiber to be polished.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A precision positioning fixture for optical fiber polishing includes: a polishing equipment body, which has an elastic positioning block inside for pressing against the optical fiber to be polished. The elastic positioning block is connected to the polishing equipment body via a positioning spring, and the top of the elastic positioning block forms an inclined surface; a positioning fixture assembly, mounted on the polishing equipment body, and including a pressing locking mechanism, an optical fiber clamping mechanism, and a cyclic inclined pressing mechanism; wherein, the pressing locking mechanism is used to adjust the locking position, the optical fiber clamping mechanism can move downward relative to the pressing locking mechanism and be locked, and the cyclic inclined pressing mechanism moves downward with the optical fiber clamping mechanism and squeezes the inclined surface of the elastic positioning block, so that the elastic positioning block is close to the optical fiber to be polished, thereby maintaining the clamping and positioning state.

[0008] According to some embodiments, the downward locking mechanism includes: a locking mounting base, fixedly mounted on the grinding equipment body; a positive and negative screw, rotatably mounted inside the locking mounting base; two locking sliders, both slidably mounted on the locking mounting base and respectively threaded to both ends of the positive and negative screws; and two locking racks, respectively fixedly mounted on the two locking sliders.

[0009] According to some embodiments, the pressing locking mechanism further includes: a second bevel gear, fixedly mounted on the positive and negative screws; an adjusting knob, rotatably mounted on the locking mounting base; and a first bevel gear, fixedly mounted on the adjusting knob and meshing with the second bevel gear; wherein the adjusting knob drives the positive and negative screws to rotate through the first and second bevel gears, so that the two locking sliders move towards or away from each other.

[0010] According to some embodiments, the fiber optic clamping mechanism includes: a clamping guide seat, slidably mounted on the locking mounting seat; a drive spring, disposed between the clamping guide seat and the locking mounting seat, and used to drive the clamping guide seat to move downward; a sliding push rod, slidably mounted inside the clamping guide seat; a reset spring, connected between the sliding push rod and the clamping guide seat; and an tilting block, slidably mounted on the clamping guide seat and fixedly connected to the sliding push rod.

[0011] According to some embodiments, the tilting block matches the locking rack, and the tilting block abuts against the locking rack when the clamping guide seat moves down, causing the sliding push rod to compress the return spring; when the tilting block passes the tooth position of the locking rack, the return spring pushes the sliding push rod to return to its original position, so that the tilting block engages with or abuts against the locking rack for locking.

[0012] According to some embodiments, the circulating inclined pressing mechanism includes: a mounting housing fixedly connected to the clamping guide seat; a circulating belt extrusion assembly disposed inside the mounting housing and used to extrude the elastic positioning block as the mounting housing moves downward; and a dust extraction and cleaning assembly disposed inside the mounting housing and used to clean the circulating belt extrusion assembly.

[0013] According to some embodiments, the circulating belt extrusion assembly includes: an inclined bearing plate, fixedly installed inside the mounting housing; two rotating shafts, both rotatably installed on the mounting housing; two conveying rollers, respectively fixedly installed on the two rotating shafts; a conveyor belt, drivingly connected between the two conveying rollers; two indexing drive rods, both rotatably installed on the mounting housing, each having a track groove on its outer surface; and two universal joints, respectively connected between the two indexing drive rods and their corresponding conveying rollers.

[0014] According to some embodiments, the circulating belt extrusion assembly further includes: two ratchet wheels, respectively fixedly disposed inside the two conveyor rollers; two pawls, respectively matched with the two ratchet wheels and respectively fixedly connected to the two universal joints; wherein, the indexing drive rod drives the pawls to rotate through the universal joints, and the pawls drive the conveyor rollers to rotate unidirectionally through the ratchet wheels, so that the conveyor belt switches the area in contact with the elastic positioning block.

[0015] According to some embodiments, the vacuum cleaning assembly includes: a cleaning pressure plate disposed inside the mounting housing; a floating support plate slidably mounted inside the mounting housing; a plurality of floating compression springs connected between the floating support plate and the mounting housing; a squeezing rod fixedly mounted at the bottom end of the floating support plate and slidably connected to the mounting housing; and two guide posts, both fixedly mounted on the floating support plate and respectively matched with the track grooves on the two indexing drive rods.

[0016] According to some embodiments, the vacuum cleaning assembly further includes: a gear frame, fixedly mounted on the floating support plate; the circulating inclined pressure mechanism further includes: an air suction pipe, fixedly mounted on the mounting housing; a spherical seat, fixedly mounted on the air suction pipe; a hollow ball head, rotatably mounted inside the spherical seat; a drive shaft, rotatably mounted on the spherical seat and fixedly connected to the hollow ball head; a spur gear, fixedly mounted on the drive shaft and meshing with the gear frame; and a vacuum hood, fixedly mounted at the bottom end of the spherical seat and fixedly connected to the inclined support plate.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0018] 1. This invention uses a driving spring to push the clamping guide seat downward, causing the circulating inclined pressing mechanism connected to the clamping guide seat to move downward synchronously. By utilizing the contact between the working section of the conveyor belt and the inclined surface of the top of the elastic positioning block, the vertical downward pressure is converted into a force that pushes the elastic positioning block closer to the optical fiber to be polished. At the same time, the positioning spring reserves a movement margin for the elastic positioning block to adapt to the size difference of the workpiece. After the inclined block passes the corresponding tooth position of the locking rack, the reset spring pushes the sliding push rod and the inclined block to reset, so that the inclined block is constrained by the reverse displacement of the locking rack. Thus, while the elastic positioning block has elastic adaptability, its clamping state no longer depends solely on the elastic deformation of the positioning spring. This helps to reduce the retraction of the positioning component caused by load changes during continuous polishing and maintain the clamping state of the optical fiber or optical fiber ferrule relative to the polishing position.

[0019] 2. This invention drives the first bevel gear to rotate by adjusting the knob. The meshing of the first and second bevel gears transmits torque to the positive and negative screws. The positive and negative screws use threads with opposite directions at both ends to drive the two locking sliders to move towards or away from each other along the locking mounting base. This causes the locking racks fixed on the two locking sliders to synchronously change their position relative to the movement path of the inclined blocks. When the thread parameters on both sides of the positive and negative screws correspond, the adjustment amount of the locking racks on both sides is formed by the same rotation input. This allows for corresponding adjustment of the locking positions on both sides while keeping the installation position of the locking mounting base unchanged. It also ensures that the inclined blocks on both sides have relatively consistent structural conditions when entering the locking area, making it easier to adjust the downward locking state of the clamping guide seat according to the actual clamping position, while reducing the positional differences caused by adjusting the locking components on both sides separately.

[0020] 3. This invention causes the extrusion rod to press against the grinding equipment body when the mounting housing moves downward, causing the floating support plate to move relative to the mounting housing. This also causes the guide column to have relative displacement along the track groove on the outer surface of the indexing drive rod. The track groove converts this linear displacement into rotation of the indexing drive rod, which then drives the conveyor roller to rotate in a set direction via the universal joint, pawl, and ratchet. This allows the conveyor belt to move a predetermined distance during one clamping process, moving the belt surface that has already participated in the extrusion out of the main contact area of ​​the elastic positioning block and allowing another belt surface to enter the working position. At the same time, the ratchet and pawl restrict the conveyor roller from rotating in the opposite direction with the indexing drive rod during the resetting of the mounting housing, so that the conveyor belt maintains its current position after indexing. This allows different belt surface areas to bear the extrusion contact in sequence, reducing the contact state changes caused by continuous repeated pressure on the same local area.

[0021] 4. This invention uses the movement of the floating support plate relative to the mounting housing to synchronously drive the displacement of the gear frame, causing the gear frame to mesh with the spur gear and drive the spur gear, drive shaft, and hollow ball head to rotate. When the hollow ball head rotates to the corresponding position, it creates a negative pressure path for airflow through the suction pipe, the internal cavity of the hollow ball head, and the dust collection hood. This allows for the suction and cleaning of the belt surface that has left the main extrusion area as the conveyor belt is indexed. The grinding powder, glass shavings, and particles that can move with the airflow adhering to the belt surface enter the dust collection hood and are discharged through the suction pipe. After the mounting housing is reset, the floating clamping spring pushes the floating support plate back to its initial position and drives the hollow ball head to rotate. This ensures that the cleaning process corresponds to the indexing and reset process of the conveyor belt, which helps to reduce the impact of residual particles carried by the used belt surface on the subsequent contact area. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of the fiber optic polishing precision positioning fixture of the present invention;

[0024] Figure 2 This is a top view of the grinding equipment body and the positioning fixture assembly.

[0025] Figure 3 for Figure 2 Enlarged structural diagram of section A in the middle;

[0026] Figure 4 This is a structural schematic diagram of the positioning fixture assembly;

[0027] Figure 5 This is a schematic diagram of the downward locking mechanism;

[0028] Figure 6 This is a schematic diagram of the fiber optic clamping mechanism;

[0029] Figure 7 A cross-sectional view of the mounting housing, the circulating belt extrusion assembly, and the vacuum cleaning assembly;

[0030] Figure 8 This is a schematic diagram of the structure of the recirculating belt extrusion assembly;

[0031] Figure 9 This is a schematic diagram of a ratchet and pawl drive structure.

[0032] Figure 10This is a schematic diagram of the connection structure of the suction pipe, ball seat, hollow ball head and dust hood;

[0033] Figure 11 This is a schematic diagram of the internal structure of a vacuum cleaning component.

[0034] Figure 12 for Figure 11 Enlarged structural diagram of section B;

[0035] Figure 13 This is a schematic diagram of the gear frame structure.

[0036] Reference numerals: 100, Grinding equipment body; 101, Elastic positioning block; 102, Positioning spring; 200, Positioning clamp assembly; 210, Downward locking mechanism; 211, Locking mounting base; 212, Locking rack; 213, Locking slider; 214, Adjustment knob; 215, First bevel gear; 216, Second bevel gear; 217, Positive and negative screws; 220, Fiber optic clamping mechanism; 221, Clamping guide seat; 222, Return spring; 223, Sliding push rod; 224, Inclined block; 225, Drive spring; 230, Circulating inclined pressure mechanism; 231. 232. Mounting housing; 233. Suction pipe; 234. Spherical seat; 235. Hollow ball head; 236. Spur gear; 237. Dust hood; 240. Circulating belt extrusion assembly; 241. Inclined bearing plate; 242. Indexing drive rod; 243. Universal joint; 244. Rotating shaft; 245. Conveyor roller; 246. Conveyor belt; 247. Ratchet; 248. Pawl; 250. Dust collection and cleaning assembly; 251. Floating pressure spring; 252. Cleaning pressure plate; 253. Floating support plate; 254. Extrusion rod; 255. Guide column; 256. Gear frame. Detailed Implementation

[0037] To make the above-mentioned objects, features, and advantages of the present invention more readily understood, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0038] This invention is described in detail with reference to the accompanying drawings. When detailing the embodiments of this invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not to scale. Furthermore, the accompanying drawings are merely examples and should not be construed as limiting the scope of protection of this invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0039] Furthermore, it should be noted in the description of this invention that the terms "first," "second," or "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] Example 1: As Figures 1 to 6 As shown, a precision positioning fixture for optical fiber polishing includes a polishing equipment body 100, which serves as the mounting base for a positioning fixture assembly 200. The optical fiber to be polished or an optical fiber ferrule is inserted into a corresponding mounting position on the polishing equipment body 100. An elastic positioning block 101 is provided inside the polishing equipment body 100. The elastic positioning block 101 is connected to the polishing equipment body 100 via a positioning spring 102. The elastic positioning block 101 can move towards the optical fiber to be polished or reset away from the optical fiber to be polished within the compression or extension range of the positioning spring 102. An inclined surface is formed on the top of the elastic positioning block 101, which is positioned towards the downward movement path of the cyclic inclined pressing mechanism 230.

[0041] For fiber polishing, the constraint on the fiber to be polished depends not only on the magnitude of the clamping force, but also on whether the clamping member is allowed to generate relative displacement under the polishing friction load. If the clamping member is always held in position by the elastic element alone, the elastic element may generate a corresponding slight elastic deformation when the direction of the external friction load changes. Therefore, in this embodiment, the positioning spring 102 is not used as the final position holding member alone. Instead, the positioning spring 102 is mainly used to provide adaptive movement and reset space for the elastic positioning block 101, and the downward locking mechanism 210 holds the downward pressing position of the cyclic inclined pressing mechanism 230.

[0042] Specifically, the positioning fixture assembly 200 is mounted on the grinding equipment body 100 and includes a downward locking mechanism 210, an optical fiber clamping mechanism 220, and a cyclic inclined pressing mechanism 230. The downward locking mechanism 210 includes a locking mounting base 211 fixed on the grinding equipment body 100. A positive and negative screw 217 is rotatably arranged inside the locking mounting base 211. Two locking sliders 213 are respectively connected to the two oppositely helical threads of the positive and negative screws 217. Two locking racks 212 are respectively fixed on the corresponding locking sliders 213.

[0043] The adjusting knob 214 is rotatably mounted on the locking mounting base 211. The first bevel gear 215 is fixed to the adjusting knob 214, and the second bevel gear 216 is fixed to the positive and negative screw 217. The first bevel gear 215 and the second bevel gear 216 mesh with each other. When the operator rotates the adjusting knob 214, the adjusting knob 214 drives the first bevel gear 215 to rotate. The first bevel gear 215 transmits torque to the second bevel gear 216 through tooth surface meshing. The second bevel gear 216 drives the positive and negative screw 217 to rotate around its own axis.

[0044] Because the threads at both ends of the positive and negative screws 217 rotate in opposite directions, when the thread parameters of the two locking sliders 213 correspond, the two locking sliders 213 move in opposite directions when the positive and negative screws 217 rotate through the same angle. When the lead of the two thread segments is the same, the theoretical displacement of the two locking sliders 213 is equal, thereby causing the two locking racks 212 to move closer together or further apart. This allows for changing the interaction position between the locking racks 212 and the tilting block 224 along their movement paths without changing the mounting center of the locking mounting base 211, thus maintaining relative symmetry in the clamping structures on both sides.

[0045] In addition to changing the locking position, the above-mentioned symmetrical adjustment can also make the adjustment amount of the locking racks 212 on both sides determined by the same positive and negative screws 217, reducing the left and right position difference that may occur when adjusting the two locking racks 212 separately, so that the inclined blocks 224 on both sides have similar geometric conditions when entering the locking area.

[0046] The fiber optic clamping mechanism 220 includes a clamping guide seat 221, which is slidably mounted on a locking mounting seat 211. A drive spring 225 is disposed between the clamping guide seat 221 and the locking mounting seat 211. In the released state, the drive spring 225 applies a downward force to the clamping guide seat 221. A sliding push rod 223 is slidably disposed inside the clamping guide seat 221. A return spring 222 is disposed between the sliding push rod 223 and the clamping guide seat 221. An inclined block 224 is slidably mounted on the clamping guide seat 221 and fixedly connected to the sliding push rod 223.

[0047] When the clamping guide seat 221 begins to move downward under the action of the drive spring 225, the tilting block 224 moves downward together with the clamping guide seat 221. When the tilted surface of the tilting block 224 contacts the teeth of the locking rack 212, the locking rack 212 applies a contact reaction force with a lateral component to the tilting block 224. This lateral component pushes the tilting block 224 and the sliding push rod 223 backward relative to the clamping guide seat 221, and compresses the return spring 222. As the clamping guide seat 221 continues to descend, after the tilting block 224 passes the current tooth, the lateral compressive force from the locking rack 212 decreases. The return spring 222 releases the stored elastic potential energy and pushes the sliding push rod 223 and the tilting block 224 back towards the locking rack 212, so that the tilting block 224 enters the position below the adjacent tooth or the corresponding abutment position.

[0048] Because the teeth of the locking rack 212 allow the tilting block 224 to pass through in the downward direction, while forming an abutment constraint in the opposite upward direction, the upward tendency of the clamping guide seat 221 after reaching the corresponding position is limited by the contact between the locking rack 212 and the tilting block 224. This structure primarily uses the function of the drive spring 225 to push the clamping guide seat 221 downward, and the spatial position after downward movement is maintained by the contact relationship between the tilting block 224 and the locking rack 212. Therefore, the grinding load must first overcome the corresponding tooth surface constraint before the clamping guide seat 221 can undergo reverse displacement.

[0049] The cyclic inclined pressing mechanism 230 is fixedly connected to the clamping guide seat 221. When the clamping guide seat 221 descends, the cyclic inclined pressing mechanism 230 descends synchronously and gradually contacts the inclined surface of the top of the elastic positioning block 101. Under ideal conditions where contact surface friction is ignored, the vertical force applied by the cyclic inclined pressing mechanism 230 can be decomposed into a component along the lateral movement direction of the elastic positioning block 101 through the inclined contact surface. Therefore, the vertical stroke of the cyclic inclined pressing mechanism 230 can be converted into a lateral displacement of the elastic positioning block 101 towards the optical fiber to be polished. As the elastic positioning block 101 gradually approaches the optical fiber to be polished, the deformation of the positioning spring 102 is adjusted accordingly, so that the elastic positioning block 101 retains a certain elastic adaptability after contacting the optical fiber to be polished.

[0050] In this way, the drive spring 225 is responsible for forming the downward stroke, the inclined surface of the cyclic inclined pressing mechanism 230 and the elastic positioning block 101 is responsible for changing the direction of the force, the positioning spring 102 is responsible for absorbing dimensional tolerances and local position errors, and the locking rack 212, the inclined block 224, the sliding push rod 223 and the return spring 222 are responsible for maintaining the downward position. The functions of each component are distinguished from each other, which can avoid a single elastic element simultaneously undertaking stroke driving, dimensional compensation and position holding, thus preventing the clamping state from relying too much on elastic deformation.

[0051] When it is necessary to release the clamp, the operator rotates the adjustment knob 214 in the opposite direction, causing the forward and reverse screws 217 to drive the two locking sliders 213 to move in opposite directions. The two locking racks 212 move away from the upward constraint position of the inclined block 224. Then, the operator manually overcomes the force of the drive spring 225 to lift the clamping guide seat 221 upward. The cyclic inclined pressure mechanism 230 rises accordingly, and the inclined surface pressure on the elastic positioning block 101 is released. The positioning spring 102 pushes the elastic positioning block 101 away from the optical fiber to be polished, thereby forming a space where the optical fiber can be removed.

[0052] Example 2: As Figure 4 , Figures 7 to 9 as well as Figure 11 , Figure 12As shown, while all other parts are the same as in Embodiment 1, this embodiment further enables the cyclic inclined pressing mechanism 230 to switch the actual extrusion contact area when completing one pressing action.

[0053] The circulating inclined pressing mechanism 230 includes a mounting housing 231, which is fixedly connected to the clamping guide seat 221. Therefore, when the clamping guide seat 221 descends or rises, the mounting housing 231 has a corresponding vertical movement. The mounting housing 231 is internally provided with a circulating belt compression assembly 240 and a dust extraction and cleaning assembly 250.

[0054] The circulating belt extrusion assembly 240 includes an inclined support plate 241 fixedly disposed inside the mounting housing 231, two rotating shafts 244 respectively rotatably mounted on the mounting housing 231, two conveyor rollers 245 respectively fixed to the corresponding rotating shafts 244, and a conveyor belt 246 wound between the two conveyor rollers 245, thereby forming a closed belt body capable of circulating movement. The section of the conveyor belt 246 facing the elastic positioning block 101 constitutes the working section, and the inclined support plate 241 is disposed corresponding to this working section so that when the conveyor belt 246 is subjected to the reaction force of the elastic positioning block 101, its back side can be supported by the inclined support plate 241.

[0055] This configuration allows the conveyor belt 246 to primarily function as a contact surface renewing and surface isolation unit, while the actual clamping reaction force can be transmitted through the conveyor belt 246 to the inclined bearing plate 241 and the mounting housing 231, thereby preventing the conveyor belt 246 from bearing the main compressive force in a suspended state. In specific manufacturing, the conveyor belt 246 can be a closed belt with a wear-resistant surface layer and relatively uniform thickness. The inclined bearing plate 241 and the working section of the conveyor belt 246 can form a close contact or a small support gap, as long as it can limit excessive deflection of the conveyor belt 246 to the back side after being compressed.

[0056] Two indexing drive rods 242 are rotatably mounted on the mounting housing 231. Track grooves are provided on the outer periphery of each indexing drive rod 242. These track grooves can be spiral grooves extending around the axis of the indexing drive rod 242 or spatial curved grooves with an equivalent axial-circumferential displacement relationship. Two guide posts 255 on the floating support plate 253 extend into the corresponding track grooves of the indexing drive rods 242.

[0057] The floating support plate 253 in the vacuum cleaning assembly 250 is slidably installed inside the mounting housing 231. Multiple floating compression springs 251 are disposed between the floating support plate 253 and the mounting housing 231. The pressing rod 254 is fixed to the bottom of the floating support plate 253 and slides through the mounting housing 231. When the mounting housing 231 descends, the lower end of the pressing rod 254 first or subsequently contacts the corresponding support surface of the grinding equipment body 100. As the mounting housing 231 continues to descend, the pressing rod 254 is blocked by the grinding equipment body 100, thus creating a relative displacement between the pressing rod 254 and the mounting housing 231. The pressing rod 254 drives the floating support plate 253 to move relative to the mounting housing 231 and compresses the floating compression springs 251.

[0058] At this time, the guide post 255 fixed on the floating support plate 253 generates axial relative motion along the track groove of the indexing drive rod 242. Since the axial position of the indexing drive rod 242 is restricted by the mounting housing 231 and retains the degree of freedom to rotate around its own axis, the guide post 255 generates a circumferential component on the side wall of the track groove, thereby causing the indexing drive rod 242 to rotate. When the track groove adopts a helical groove with an approximately constant lead, under ideal motion conditions, the greater the axial displacement of the guide post 255 relative to the indexing drive rod 242, the greater the rotation angle of the indexing drive rod 242. Therefore, the indexing angle corresponding to one pressing can be determined by the track groove lead and the effective relative stroke of the pressing rod 254.

[0059] Two universal joints 243 are respectively disposed between the two indexing drive rods 242 and the corresponding conveying rollers 245, so as to allow a certain installation angle between the indexing drive rods 242 and the conveying rollers 245, and to transmit the rotation of the indexing drive rods 242 to the end of the conveying rollers 245. Two ratchet wheels 247 are respectively fixedly disposed inside the corresponding conveying rollers 245, and two pawls 248 respectively cooperate with the ratchet wheels 247 and are fixedly connected to the corresponding universal joints 243.

[0060] When the indexing drive rod 242 rotates in the set direction, the universal joint 243 drives the pawl 248 to move around the axis of the conveyor roller 245. The pawl 248 abuts against the drive tooth surface of the ratchet 247, causing the ratchet 247 and the conveyor roller 245 to rotate in the working direction. The two conveyor rollers 245 thereby drive the conveyor belt 246 to move a predetermined distance, so that the area of ​​the conveyor belt 246 that was originally in contact with the elastic positioning block 101 moves out of the working position, while the other section of the conveyor belt 246 enters the working position.

[0061] When grinding is complete and the mounting housing 231 is reset upwards, the floating clamping spring 251 pushes the floating support plate 253 to gradually return to its initial relative position. The guide post 255 moves in the opposite direction along the track groove, causing the indexing drive rod 242 to rotate in the opposite direction. At this time, the pawl 248 passes over the corresponding tooth along the non-driving tooth surface of the ratchet 247. The ratchet 247 and the conveyor roller 245 do not reverse synchronously with the indexing drive rod 242, so the conveyor belt 246 remains in the position where indexing has been completed. Thus, the reciprocating motion of the mounting housing 231 is converted into intermittent unidirectional displacement of the conveyor belt 246, instead of the conveyor belt 246 returning to its original contact position when the mounting housing 231 rises.

[0062] When the fixed inclined pressing component maintains contact with the elastic positioning block 101 on the same surface for an extended period, the contact pressure and particles in the grinding environment tend to concentrate on the same area. In this embodiment, the conveyor belt 246 moves a preset distance after each prescribed clamping stroke, allowing different belt surface areas to participate in the extrusion sequentially. This disperses the number of contacts across multiple locations on the conveyor belt 246. Simultaneously, the used area of ​​the conveyor belt 246 enters the mounting housing 231 with the indexing movement, establishing the positional conditions for the subsequent vacuum cleaning assembly 250 to process this area.

[0063] Example 3: As Figure 7 as well as Figures 10 to 13 As shown, while all other parts are the same as in Embodiment 2, this embodiment further utilizes the relative movement of the floating support plate 253 to change the state of the dust suction path, so that the conveyor belt 246, which has left the extrusion working area, passes through the negative pressure cleaning area in the circulation path.

[0064] The vacuum cleaning assembly 250 includes a toothed frame 256, which is fixedly mounted on a floating support plate 253. Therefore, when the extrusion rod 254 is blocked by the grinding equipment body 100 and pushes the floating support plate 253 to move relative to the mounting housing 231, the toothed frame 256 moves in the same direction as the floating support plate 253.

[0065] The circulating inclined pressure mechanism 230 also includes an air intake pipe 232, a spherical seat 233, a hollow ball head 234, a spur gear 235, a drive shaft 236, and a dust collection hood 237. The air intake pipe 232 is fixed to the mounting housing 231, and its upper end is used to input negative pressure. The spherical seat 233 is fixedly mounted on the air intake pipe 232, and the hollow ball head 234 is rolled within the spherical seat 233, allowing the hollow ball head 234 to rotate relative to the spherical seat 233 while maintaining a spherical fit. The drive shaft 236 is rotatably mounted on the spherical seat 233 and fixedly connected to the hollow ball head 234. The spur gear 235 is fixed to the drive shaft 236 and meshes with the teeth of the gear frame 256.

[0066] The dust suction hood 237 is fixedly mounted on the bottom of the spherical seat 233 and fixedly connected to the inclined support plate 241. The suction inlet of the dust suction hood 237 faces the movement path of the conveyor belt 246 after it exits the working area. Thus, the relative positions of the inclined support plate 241, the dust suction hood 237, and the conveyor belt 246 are all determined by the mounting housing 231. When the entire circulating inclined pressure mechanism 230 moves up and down, the dust suction hood 237 can still maintain a set distance relative to the cleaning area of ​​the conveyor belt 246.

[0067] The hollow ball head 234 has an internal cavity that allows airflow, and ventilation openings corresponding to the suction pipe 232 and the dust cover 237 are formed on its corresponding surface. When the hollow ball head 234 is at a non-cleaning angle, the effective overlap area between its ventilation opening and the suction pipe 232 or the dust cover 237 is small; when the hollow ball head 234 is rotated to a cleaning angle, the internal cavity of the hollow ball head 234 creates a continuous negative pressure passage between the suction pipe 232 and the dust cover 237.

[0068] As the mounting housing 231 moves downward, the pressing rod 254 contacts the grinding equipment body 100, causing the floating support plate 253 to undergo relative displacement, and the gear frame 256 moves with the floating support plate 253. Since the gear frame 256 meshes with the spur gear 235, the linear displacement of the gear frame 256 is converted into the rotation of the spur gear 235. The spur gear 235 drives the hollow ball head 234 to rotate within the spherical seat 233 via the drive shaft 236. By setting the tooth length of the gear frame 256, the pitch circle size of the spur gear 235, and the initial angle of the hollow ball head 234, the hollow ball head 234 can achieve a cleaning angle when the conveyor belt 246 begins indexing or when the area of ​​the conveyor belt 246 after use enters the corresponding area of ​​the dust collection hood 237.

[0069] Negative pressure enters through the suction pipe 232, passes through the internal cavity of the hollow ball head 234, and reaches the dust collection hood 237, which forms a localized airflow corresponding to the conveyor belt 246. Grinding powder, glass shavings, and other particles that can be carried away by the airflow, which have already moved to this area with the conveyor roller 245, enter the dust collection hood 237 and are subsequently discharged from the fixture through the hollow ball head 234 and the suction pipe 232. Since the cleaning process corresponds to the area of ​​the conveyor belt 246 that has already left the main extrusion position, the suction action does not directly change the contact state between the elastic positioning block 101 and the conveyor belt 246 in the current main extrusion area.

[0070] When the mounting housing 231 returns to its upward position, the floating clamping spring 251 pushes the floating support plate 253 to return to its original position, the gear frame 256 moves in the reverse direction, and the spur gear 235, drive shaft 236, and hollow ball head 234 rotate. As the vent opening of the hollow ball head 234 gradually deviates from the cleaning angle, the effective flow area between the suction pipe 232 and the dust hood 237 decreases, ending the current cleaning cycle. Simultaneously, the ratchet 247 and pawl 248 in Embodiment 2 prevent the conveyor belt 246 from reversing, thus the cleaned area of ​​the conveyor belt 246 continues to maintain its position along a single cycle direction.

[0071] In a preferred embodiment, the ventilation opening of the hollow ball head 234 can be configured as an elongated oval or a window whose width gradually changes along the direction of rotation. This ensures that when the toothed frame 256 drives the hollow ball head 234 to rotate, the effective flow cross-section between the suction pipe 232 and the dust collection hood 237 does not open completely instantaneously, but gradually increases with the rotation angle of the hollow ball head 234. In this way, a small suction flow rate is formed when the conveyor belt 246 first begins to move, a larger flow cross-section is formed after the used belt surface enters the main cleaning area of ​​the dust collection hood 237, and then gradually decreases during resetting.

[0072] The cleaning pressure plate 252 can be arranged opposite to the dust suction hood 237 in the thickness direction of the conveyor belt 246, with the conveyor belt 246 passing between them. The cleaning pressure plate 252 provides back support for the conveyor belt 246, and the dust suction hood 237 forms a negative pressure area from the other side. In this way, when a local pressure difference is generated in the dust suction hood 237, the cleaning section of the conveyor belt 246 is spatially restricted by the cleaning pressure plate 252, which helps to maintain the suction gap between the dust suction hood 237 and the conveyor belt 246.

[0073] Through the above structure, the vertical displacement during a single clamping process is no longer only used to push the elastic positioning block 101, but also sequentially forms three different results: First, the downward movement of the clamping guide seat 221 brings the elastic positioning block 101 closer to the optical fiber, and maintains the downward pressure position through the tilting block 224 and the locking rack 212; Second, the relative displacement between the mounting housing 231 and the floating support plate 253 causes the indexing drive rod 242 to rotate through the guide post 255 and the track groove, and then causes the conveyor belt 246 to perform unidirectional indexing through the pawl 248 and the ratchet 247; Third, the displacement of the same floating support plate 253 changes the angle of the hollow ball head 234 through the gear frame 256 and the spur gear 235, so that the area of ​​the used conveyor belt 246 receives negative pressure when entering the cleaning path. All three processes take the actual movement of the clamping guide seat 221 and the mounting housing 231 as the starting condition, so there is a definite spatial and temporal correspondence between each stage.

[0074] Overall working principle:

[0075] Insert the optical fiber or fiber ferrule to be ground into the corresponding grinding position on the grinding equipment body 100, so that the end face to be ground is located in the specified processing area. Rotate the adjustment knob 214 according to the clamping size of the optical fiber or fiber ferrule to be processed. The adjustment knob 214 drives the first bevel gear 215 to rotate. The first bevel gear 215 drives the second bevel gear 216 and the forward and reverse screws 217 to rotate. The forward and reverse screws 217 cause the two locking sliders 213 to move synchronously towards or away from each other, so that the two locking racks 212 reach the corresponding locking positions.

[0076] Release the clamping guide seat 221, and drive the spring 225 to push the clamping guide seat 221 downward. The clamping guide seat 221 drives the mounting housing 231 and the circulating inclined pressure mechanism 230 to descend as a whole. After the tilting block 224 contacts the teeth of the locking rack 212, it is subjected to lateral compressive force, which causes the sliding push rod 223 to move relative to the clamping guide seat 221 and compress the return spring 222. The tilting block 224 passes over the corresponding teeth in sequence.

[0077] As the cyclic inclined pressure mechanism 230 continues to descend, the working section of the conveyor belt 246 contacts the inclined surface of the elastic positioning block 101 under the back support of the inclined bearing plate 241. The vertical downward pressure forms a lateral component of action in the direction of the optical fiber to be polished through the inclined surface. The elastic positioning block 101 overcomes the corresponding action of the positioning spring 102 and approaches the optical fiber to be polished until the desired clamping state is formed.

[0078] When the tilting block 224 passes the teeth of the corresponding locking rack 212, the return spring 222 pushes the sliding push rod 223 and the tilting block 224 to reset, and the tilting block 224 enters the restricted area of ​​the corresponding teeth. At this time, the reverse upward movement of the clamping guide seat 221 is restricted, the cyclic inclined pressure mechanism 230 remains in the downward pressure position, the elastic positioning block 101 continues to position the optical fiber or optical fiber ferrule to be polished, and then the polishing equipment body 100 performs the corresponding end face polishing process.

[0079] During the downward movement of the mounting housing 231, the pressing rod 254 contacts the grinding equipment body 100, causing the floating support plate 253 to move relative to the mounting housing 231 and compress the floating clamping spring 251. The guide column 255 moves along the track groove of the indexing drive rod 242 and causes the indexing drive rod 242 to rotate. The indexing drive rod 242 drives the pawl 248 via the universal joint 243. The pawl 248 pushes the ratchet 247 and the corresponding conveyor roller 245 to rotate in a set direction. The two conveyor rollers 245 drive the conveyor belt 246 to move a predetermined distance, so that the used contact area leaves the main pressing position of the elastic positioning block 101.

[0080] As the floating support plate 253 moves, it drives the gear frame 256 to move as well. The gear frame 256 drives the spur gear 235 to rotate, and the spur gear 235 drives the hollow ball head 234 to rotate within the spherical seat 233 via the drive shaft 236. When the hollow ball head 234 reaches a set angle, the suction pipe 232, the internal cavity of the hollow ball head 234, and the dust collection hood 237 form a negative pressure passage. The belt surface that enters the corresponding area of ​​the dust collection hood 237 as the conveyor belt 246 is indexed receives negative pressure suction, and movable particles on the belt surface are sucked into the dust collection hood 237 and discharged through the suction pipe 232.

[0081] After grinding is completed, the adjusting knob 214 is rotated in the opposite direction, causing the forward and reverse screws 217 to drive the two locking sliders 213 and the locking rack 212 to move in opposite directions, so that the locking rack 212 leaves the upward movement restriction area of ​​the inclined block 224. The clamping guide seat 221 is manually lifted upward, and the mounting housing 231 and the circulating inclined pressure mechanism 230 rise synchronously. The conveyor belt 246 leaves the inclined surface of the elastic positioning block 101, and the positioning spring 102 pushes the elastic positioning block 101 away from the optical fiber to be ground, thereby releasing the clamp.

[0082] As the mounting housing 231 rises, the clamping rod 254, which was restricted by the grinding equipment body 100, gradually releases, and the floating clamping spring 251 pushes the floating support plate 253 back to its initial relative position. The guide column 255 causes the indexing drive rod 242 to rotate in the opposite direction, but the pawl 248 skips over the teeth on the ratchet 247, and the conveyor roller 245 and conveyor belt 246 maintain the completed indexing position; the gear frame 256 moves in the opposite direction, causing the spur gear 235, drive shaft 236 and hollow ball head 234 to rotate, reducing or closing the negative pressure passage between the suction pipe 232 and the dust hood 237. After the reset is completed, the conveyor belt 246, which has been indexed and cleaned, enters the next clamping cycle, and the equipment can then be loaded with the next optical fiber or optical fiber ferrule to be ground.

[0083] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A precision positioning fixture for optical fiber grinding, characterized in that, include: The grinding equipment body (100) has an elastic positioning block (101) inside for pressing the optical fiber to be ground. The elastic positioning block (101) is connected to the grinding equipment body (100) through a positioning spring (102), and the top of the elastic positioning block (101) forms an inclined surface. The positioning fixture assembly (200) is mounted on the grinding equipment body (100) and includes a pressing locking mechanism (210), an optical fiber clamping mechanism (220) and a cyclic inclined pressing mechanism (230). The pressing locking mechanism (210) is used to adjust the locking position. The fiber clamping mechanism (220) can move down relative to the pressing locking mechanism (210) and be locked. The cyclic inclined pressing mechanism (230) moves down with the fiber clamping mechanism (220) and squeezes the inclined surface of the elastic positioning block (101) so that the elastic positioning block (101) is close to the fiber to be polished, so as to maintain the clamping and positioning state.

2. The precision positioning fixture for optical fiber grinding according to claim 1, characterized in that, The downward locking mechanism (210) includes: A locking mounting base (211) is fixedly installed on the grinding equipment body (100); The positive and negative screws (217) are rotatably mounted inside the locking mounting base (211); Two locking sliders (213) are slidably mounted on the locking mounting base (211) and are threaded to both ends of the positive and negative screws (217); Two locking racks (212) are fixedly installed on the two locking sliders (213) respectively.

3. The precision positioning fixture for optical fiber grinding according to claim 2, characterized in that, The downward locking mechanism (210) further includes: The second bevel gear (216) is fixedly mounted on the positive and negative screws (217); Adjust the knob (214), which is rotatably mounted on the locking mounting base (211); The first bevel gear (215) is fixedly mounted on the adjusting knob (214) and meshes with the second bevel gear (216); The adjustment knob (214) drives the positive and negative screws (217) to rotate through the first bevel gear (215) and the second bevel gear (216), so that the two locking sliders (213) move towards each other or away from each other.

4. The precision positioning fixture for optical fiber grinding according to claim 2, characterized in that, The fiber optic clamping mechanism (220) includes: The clamping guide seat (221) is slidably mounted on the locking mounting seat (211); A drive spring (225) is disposed between the clamping guide seat (221) and the locking mounting seat (211) and is used to drive the clamping guide seat (221) to move downward; A sliding push rod (223) is slidably mounted inside the clamping guide seat (221); A return spring (222) is connected between the sliding push rod (223) and the clamping guide seat (221); The tilting block (224) is slidably mounted on the clamping guide seat (221) and fixedly connected to the sliding push rod (223).

5. The precision positioning fixture for optical fiber grinding according to claim 4, characterized in that, The tilting block (224) matches the locking rack (212), and the tilting block (224) abuts against the locking rack (212) when the clamping guide seat (221) moves down, causing the sliding push rod (223) to compress the return spring (222); when the tilting block (224) passes the tooth position of the locking rack (212), the return spring (222) pushes the sliding push rod (223) to return to its original position, so that the tilting block (224) engages with or abuts against the locking rack (212) for locking.

6. The precision positioning fixture for optical fiber grinding according to claim 4, characterized in that, The circulating inclined plate pressure mechanism (230) includes: The mounting housing (231) is fixedly connected to the clamping guide seat (221); A circulating belt extrusion assembly (240) is disposed inside the mounting housing (231) and is used to extrude the elastic positioning block (101) as the mounting housing (231) moves downward. A vacuum cleaning assembly (250) is disposed inside the mounting housing (231) and is used to clean the circulating belt extrusion assembly (240).

7. A precision positioning fixture for optical fiber grinding according to claim 6, characterized in that, The recirculating belt extrusion assembly (240) includes: The inclined bearing plate (241) is fixedly installed inside the mounting housing (231); Both rotating shafts (244) are rotatably mounted on the mounting housing (231); Two conveying rollers (245) are respectively fixedly mounted on the two rotating shafts (244); A conveyor belt (246) is driven between the two conveyor rollers (245); Both indexing drive rods (242) are rotatably mounted on the mounting housing (231), and their outer surfaces are provided with track grooves; Two universal joints (243) are respectively connected between the two indexing drive rods (242) and the corresponding conveying rollers (245).

8. The precision positioning fixture for optical fiber grinding according to claim 7, characterized in that, The recirculating belt extrusion assembly (240) further includes: Two ratchet wheels (247) are respectively fixedly installed inside the two conveying rollers (245); Two pawls (248) are respectively matched with two ratchet wheels (247) and respectively fixedly connected to two universal joints (243); The indexing drive rod (242) drives the pawl (248) to rotate via the universal joint (243), and the pawl (248) drives the conveyor roller (245) to rotate unidirectionally via the ratchet (247), so that the conveyor belt (246) switches the area in contact with the elastic positioning block (101).

9. A precision positioning fixture for optical fiber grinding according to claim 7, characterized in that, The vacuum cleaning assembly (250) includes: A cleaning pressure plate (252) is disposed inside the mounting housing (231); A floating support plate (253) is slidably installed inside the mounting housing (231); Multiple floating compression springs (251) are connected between the floating support plate (253) and the mounting housing (231); The extrusion rod (254) is fixedly installed at the bottom end of the floating support plate (253) and is slidably connected to the mounting housing (231); Two guide posts (255) are fixedly installed on the floating support plate (253) and are respectively matched with the track grooves on the two indexing drive rods (242).

10. A precision positioning fixture for optical fiber grinding according to claim 9, characterized in that, The vacuum cleaning assembly (250) also includes: The gear frame (256) is fixedly installed on the floating support plate (253); The circulating inclined plane mechanism (230) further includes: The suction pipe (232) is fixedly installed on the mounting housing (231); A spherical seat (233) is fixedly installed on the suction pipe (232); A hollow ball head (234) is rolled inside a spherical seat (233); The drive shaft (236) is rotatably mounted on the spherical seat (233) and fixedly connected to the hollow ball head (234); A spur gear (235) is fixedly mounted on the drive shaft (236) and meshes with the gear carrier (256); The dust cover (237) is fixedly installed at the bottom of the spherical seat (233) and fixedly connected to the inclined bearing plate (241).

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