Optical fiber preform core rod slitting device and method

Abstract

The invention discloses an optical fiber preform core rod slitting device and method, and belongs to the field of optical fiber preform production and processing.The optical fiber preform core rod slitting device comprises a rack, and the rack is provided with a fixing table used for supporting a core rod and a floating table used for breaking the core rod; the core rod supporting and clamping unit is arranged on the fixed table and the floating table and arranged in the length direction of the core rod, and the core rod supporting and clamping unit is used for positioning and fixing the position where the core rod is located; the rotary cutting unit is arranged on the fixed table, the rotary cutting unit can rotate along the axis of the core rod, and complete annular nicks are annularly cut on the outer surface of the core rod; and the fracture execution unit is arranged on the rack, and the output end of the fracture execution unit can drive the position where the floating table is located to deviate relative to the position where the fixed table is located, so that deviation force perpendicular to the length direction of the core rod is applied to the core rod on the floating table, and the core rod is fractured along the annular nick position of the outer surface of the core rod.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical fiber preform processing equipment, in particular to an optical fiber preform core rod slitting device and method. BACKGROUND

[0002] Due to the material properties and production process requirements of the optical fiber preform core rod, external pollutants and water stains must be strictly prevented from being introduced during the slitting process, which leads to the fact that the conventional mechanical cutting piece cannot be directly applied, and the current slitting operation needs to be completed by two people working together, one person is responsible for firmly holding the core rod, and the other person uses a chain cutter to manually carve a line around it. After the line is carved, the operator still needs to knock along the line position in 360 degrees, and finally the rod body is separated by breaking, which highly depends on the personal experience and touch of the operator.

[0003] Due to the above-mentioned highly dependent operation mode, the existing slitting process must be manually completed by two people, which is high in labor cost and low in efficiency, and the slitting quality completely depends on the force, angle and position of the operator, which is extremely poor in consistency, and is easy to cause the slitting surface to be skewed, and even to be broken from the non-line position due to uncontrolled stress, which directly leads to product scrap. In addition, the manual knocking and breaking method is easy to cause defects and micro cracks on the cutting surface, which seriously affects the yield and processing efficiency of the subsequent handle connecting process, therefore, it is an urgent need to develop an automatic and high-precision special slitting device. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings in the above-mentioned technology, and to provide an optical fiber preform core rod slitting device and method, which aims to solve the problems of poor manual slitting precision, many defects on the cutting surface, low efficiency and easy to damage the product.

[0005] The present application provides an optical fiber preform core rod slitting device and method, which comprises: a rack, a fixed table for supporting the core rod and a floating table for breaking the core rod are arranged on the rack; a core rod supporting and clamping unit is arranged on the fixed table and the floating table and is arranged along the length direction of the core rod, and the core rod supporting and clamping unit is used for positioning and fixing the position of the core rod; a rotary cutting unit is arranged on the fixed table, the rotary cutting unit can rotate along the axis of the core rod, and a complete annular notch is cut around the outer surface of the core rod; a breaking execution unit is arranged on the rack, the output end of the breaking execution unit can drive the position of the floating table to be offset relative to the position of the fixed table, so as to exert an offset force on the core rod on the floating table, which is perpendicular to the length direction of the core rod, so that the core rod is broken along the annular notch on the outer surface of the core rod.

[0006] Preferably, the mandrel supporting and clamping unit comprises at least one set of supporting rollers for supporting the mandrel, and a plurality of pneumatic clamping jaw assemblies for clamping from both ends or laterally of the mandrel, two supporting rollers are respectively fixedly installed on the table surfaces of the fixed table and the floating table, the pneumatic clamping jaw assembly comprises a pneumatic cylinder, a cylinder mounting bracket is fixedly installed on the outer side of the pneumatic cylinder, the cylinder mounting bracket is respectively fixedly installed on the table surfaces of the fixed table and the floating table, two mutually cooperating jaw arms are drivingly connected to the output end of the pneumatic cylinder, the pneumatic cylinder drives the two mutually cooperating jaw arms to move synchronously to complete clamping or opening of the mandrel.

[0007] Preferably, the two mutually cooperating jaw arms are respectively fixedly installed with clamping blocks, annular grooves are respectively formed on the mutually approaching side surfaces of the two clamping blocks, the two annular grooves are abutted against each other to form a clamping part matched with the outer profile of the mandrel, and the two clamping blocks are made of Teflon material.

[0008] Preferably, the rotating cutting unit comprises a mounting seat fixedly installed on the surface of the fixed table, a through hole is formed in the center of the surface of the mounting seat, an installation shaft is fixedly installed on the inner surface of the through hole, the two ends of the installation shaft extend out of the through hole, the installation shaft has a cavity for the mandrel to pass through, a ring-shaped cutting base is rotatably connected to the installation shaft near the floating table through a bearing, a rotating handle is fixedly installed on the outer side of the cutting base, a cutting hole is formed in the center of the surface of the ring-shaped cutting base for the mandrel to pass through, a cutting knife is movably installed on the inner wall of the cutting hole, a threaded hole is formed in the annular wall of the ring-shaped cutting base, a screw rod is threadedly connected in the threaded hole, the screw rod can rotate and relatively displace in the threaded hole, the cutting knife is fixedly installed on one end of the screw rod located in the cutting hole, and a three-jaw chuck is fixedly installed on the installation shaft away from the floating table, the three-jaw chuck is used to fix the mandrel at the current position.

[0009] Preferably, the breaking execution unit comprises a bottom support frame, a slide rail is fixedly installed on the bottom support frame, a sliding block is slidingly installed on the slide rail, the floating table is fixedly installed on the sliding block, a pneumatic hammer is fixedly installed on the side wall of one end of the bottom support frame, the output end of the pneumatic hammer abuts against one side of the floating table, a limiting plate is fixedly installed on the side wall of the other end of the bottom support frame, and the limiting plate is used to limit the displacement distance of the floating table on the bottom support frame.

[0010] A kind of cutting method based on the above-mentioned optical fiber preform rod core cutting device, comprising the following steps: S1: core rod loading and positioning, the optical fiber preform rod core rod to be cut is placed on the core rod support clamping unit, so that it is supported by support roller along the length direction, and located in the predetermined cutting station;S2: core rod clamping and fixing, start pneumatic jaw assembly, drive jaw arm synchronous motion, it is clamped and fixed from the side or end of core rod by annular groove on clamping block, while the core rod is fixed by three-jaw chuck;S3: ring cutting notch formation, adjust the feed depth of screw in rotary cutting unit, drive cutting knife to accurately displace to predetermined cutting position, drive rotary handle, make annular cutting base drive cutting knife rotate around core rod axis, and cut out complete and uniform annular notch on the outer surface of core rod;S4: offset fracture execution, start fracture execution unit, control the instantaneous impact force of air hammer output, push floating table to occur rapid offset relative to fixed table along slide rail, so that the instantaneous offset force perpendicular to the length direction of core rod on floating table is applied to core rod, and core rod is neatly broken from annular notch;S5: cutting is completed and is discharged, after fracture is completed, pneumatic jaw assembly and three-jaw chuck are loosened, the core rod segment that has completed cutting is taken out, and cutting operation is completed.

[0011] Preferably, in step S3, the feed depth of cutting knife is positioned and adjusted by scale line set on screw, to ensure the depth of annular notch is consistent.

[0012] Preferably, in step S4, the impact force of air hammer or the displacement distance of floating table is adjustable, to adapt to the cutting needs of core rod with different diameter and material, and the offset motion of floating table is limited within preset displacement stroke by the limiting action of limiting plate.

[0013] Compared with prior art, the following beneficial effects are achieved: The application provides a fiber preform core rod slitting device and method, which realizes mechanical and controllable slitting of the fiber preform core rod through the rack structure of the fixed table and the floating table matched with each other, the integrated core rod supporting and clamping unit, the rotary cutting unit and the breaking execution unit, the core rod is accurately positioned and reliably fixed on the fixed table and the floating table by the supporting and clamping unit, the rotary cutting unit rotates uniformly along the core rod axis to cut a complete and uniform annular notch on the outer surface of the core rod, the breaking execution unit drives the floating table to offset relative to the fixed table to apply a precise breaking force perpendicular to the axial direction of the core rod, so that the core rod is separated along the annular notch, the mechanical clamping and rotary cutting replace the original manual support and manual marking, the operation of two people is optimized to single-person operation, the operation efficiency is improved, the labor cost is reduced, the annular notch is complete and uniform by using the equipment, the problems of the broken surface skew or unexpected breaking caused by the different depths and positions of the manual notch are fundamentally avoided, the product loss is reduced, the controllable directional offset force is applied by the breaking execution unit to replace the original multiple knocking operation depending on the strength and experience of the personnel, the core rod surface indentation caused by the knocking is effectively eliminated, the flatness and quality of the breaking surface are further ensured, and a good foundation is provided for subsequent handle connecting processes, and the automation level and product yield of the fiber preform manufacturing process are improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only preferred embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0015] Figure 1 The overall structure schematic diagram of the fiber preform core rod slitting device of one embodiment of the application is shown in the figure. Figure 2 The connection relationship between the bottom support frame and the floating table of the fiber preform core rod slitting device of one embodiment of the application is shown in the figure. Figure 3 The rotary cutting unit of the fiber preform core rod slitting device of one embodiment of the application is shown in the figure. Figure 4 The pneumatic clamping jaw assembly of the fiber preform core rod slitting device of one embodiment of the application is shown in the figure.

[0016] In the figure, 1, rack; 2, mandrel; 3, fixed table; 4, floating table; 5, supporting roller; 6, pneumatic clamping jaw assembly; 601, air cylinder; 602, air cylinder mounting frame; 603, clamping jaw arm; 604, clamping block; 7, mounting seat; 8, mounting shaft; 9, annular cutting base; 10, rotating handle; 11, cutting hole; 12, cutting knife; 13, screw rod; 14, three-jaw chuck; 15, bottom support frame; 16, slide rail; 17, sliding block; 18, air hammer; 19, limiting plate. DETAILED DESCRIPTION

[0017] In order to more easily understand the structure of the present application and the function characteristics and advantages that can be achieved, the preferred embodiments of the present application are described in detail below, as follows, with reference to the drawings: As Figure 1 shown, the present application provides a kind of optical fiber preform mandrel slitting device and method, comprising: rack 1, fixed table 3 for supporting mandrel 2 and floating table 4 for breaking mandrel 2 are provided on rack 1;Mandrel support clamping unit, mandrel support clamping unit is set to fixed table 3 and floating table 4 and is arranged along the length direction of mandrel 2, and mandrel support clamping unit is used to position and fix the position where mandrel 2 is located;Rotary cutting unit, rotary cutting unit is set to fixed table 3, rotary cutting unit can rotate along the axis of mandrel 2, and complete annular notch is cut out on the outer surface of mandrel 2;Breaking execution unit, breaking execution unit is set to rack 1, and the output end of breaking execution unit can drive the position where floating table 4 is located to be offset relative to the position where fixed table 3 is located, so as to exert offset force perpendicular to the length direction of mandrel 2 on mandrel 2 on floating table 4, so that mandrel 2 is broken along the annular notch on the outer surface of mandrel 2.

[0018] Specifically, by setting rack 1 as a cooperative structure with fixed table 3 and floating table 4, and arranging mandrel support clamping unit on fixed table 3 and floating table 4 along the length direction of mandrel 2, during slitting operation, mandrel 2 is first accurately positioned and reliably fixed on fixed table 3 and floating table 4 by support clamping unit, then rotary cutting unit arranged on fixed table 3 rotates along the axis of mandrel 2, and complete and uniform 360° annular notch is formed on the outer surface of mandrel 2 by cutting in a ring, finally, breaking execution unit is started, and the output end of breaking execution unit drives floating table 4 to produce controllable lateral offset relative to fixed table 3, so as to exert breaking stress perpendicular to the axial direction of mandrel 2 on the mandrel 2 segment supported by floating table 4.

[0019] In the process, since the core rod 2 on the fixed table 3 side has been firmly constrained, and the core rod 2 on the floating table 4 side is bent and deformed under the action of the offset force, the stress is concentrated on the thinnest link of the annular notch, and by controlling the output force and displacement of the breaking execution unit, the strict breaking of the core rod 2 along the preset annular notch can be ensured, so that the precise slitting is realized. The present application replaces manual support with mechanical clamping, replaces manual line marking with rotary ring cutting, and replaces manual knocking and breaking with controllable offset breaking, solves the problems of poor slitting surface quality, uncontrolled breaking position and high product loss rate in the original manual operation, significantly improves the slitting precision and operation safety, and provides a high-quality core rod 2 cross section for the subsequent process.

[0020] Optionally, the core rod supporting and clamping unit comprises at least one set of supporting rollers 5 for supporting the core rod 2 and a plurality of pneumatic clamping jaw assemblies 6 for clamping from both ends or the side of the core rod 2. The two supporting rollers 5 are fixedly installed on the table surfaces of the fixed table 3 and the floating table 4 respectively. The pneumatic clamping jaw assembly 6 comprises a pneumatic cylinder 601, the outer side of the pneumatic cylinder 601 is fixedly installed with a pneumatic cylinder 601 mounting bracket, the pneumatic cylinder 601 mounting bracket is fixedly installed on the table surfaces of the fixed table 3 and the floating table 4 respectively, and the output end of the pneumatic cylinder 601 is drivingly connected with two mutually cooperating clamping jaw arms 603. The pneumatic cylinder 601 drives the two mutually cooperating clamping jaw arms 603 to move synchronously to complete the clamping or opening of the core rod 2.

[0021] Specifically, as shown in Figure 1 The supporting rollers 5 are arranged on the fixed table 3 and the floating table 4 respectively to form a V-shaped or U-shaped supporting structure for the core rod 2, ensuring that the core rod 2 is effectively positioned in the axial and radial directions. The inner side of the clamping jaw arm 603 in the pneumatic clamping jaw assembly 6 is provided with an arc-shaped clamping surface matched with the outer contour of the core rod 2. When the two clamping jaw arms 603 move synchronously under the drive of the pneumatic cylinder 601, uniform clamping or release of the core rod 2 can be achieved.

[0022] In this embodiment, after the core rod 2 is placed on the supporting rollers 5, the pneumatic clamping jaw assembly 6 is started, the pneumatic cylinder 601 pushes the two clamping jaw arms 603 to close synchronously, and uniform clamping force is applied to the core rod 2 from the side. Through the positioning action of the supporting rollers 5 and the clamping action of the pneumatic clamping jaw, the core rod 2 always maintains a stable position during the slitting process, avoiding the position deviation caused by manual support, preventing the surface damage or position deviation of the core rod 2 caused by uneven clamping force, and providing a reliable positioning reference for the subsequent ring cutting and breaking processes.

[0023] The pneumatic cylinder 601 mounting bracket is connected with the table surface by bolt fixing or welding, ensuring the stability of the clamping mechanism. The transmission between the clamping jaw arm 603 and the pneumatic cylinder 601 is realized by hinging or sliding block 17 mechanism, ensuring the synchronism of the movement of the two clamping jaw arms 603 and the uniformity of the clamping force.

[0024] Optionally, the two clamping jaw arms 603 are fixedly installed with clamping blocks 604, and the two clamping blocks 604 are provided with annular grooves on the side surfaces close to each other, and the two annular grooves abut against each other to form a clamping part matched with the outer contour of the core rod 2. The two clamping blocks 604 are made of Teflon material.

[0025] Specifically, as shown in Figure 4 The clamping blocks 604 are installed at the front ends of the clamping jaw arms 603 by bolt fixation or clamping groove embedding, and the side surfaces close to each other of the two clamping blocks 604 are each provided with a semicircular annular groove. When the two clamping jaw arms 603 are synchronously closed by the air cylinder 601, the two annular grooves are aligned and tightly abutted against each other to form a complete circular clamping area which is accurately matched with the outer diameter of the core rod 2.

[0026] The clamping blocks 604 are made of Teflon material, which has inherent low friction coefficient, high wear resistance and excellent anti-sticking properties. Therefore, the clamping blocks 604 can effectively avoid scratching or indentation on the surface of the core rod 2 while applying sufficient clamping force to the core rod 2, and can also prevent the generation of particulate pollutants due to friction during clamping, thereby meeting the strict requirements of optical fiber preform production on cleanliness.

[0027] In the embodiment, the clamping blocks 604 with annular grooves are provided, so that the clamping force can be uniformly distributed circumferentially around the core rod 2, thereby avoiding local stress concentration caused by point contact or line contact. When the pneumatic clamping jaw assembly 6 performs the clamping action, the two clamping blocks 604 made of Teflon material simultaneously embrace the core rod 2 from both sides, and the annular groove structure forms a surface contact with the outer cylindrical surface of the core rod 2, thereby providing reliable fixation while minimizing potential damage to the surface of the core rod 2.

[0028] In particular, the depth of the annular groove is accurately calculated to ensure sufficient contact area to transmit the clamping force, and to avoid excessive wrapping of the core rod 2 which may affect the subsequent ring cutting operation. The selection of Teflon material not only protects the surface quality of the core rod 2, but also reduces the operating load of the air cylinder 601 due to its self-lubricating properties, thereby prolonging the service life of the equipment. This clamping structure not only ensures positioning accuracy, but also lays a foundation for subsequent high-quality cutting processes, thereby solving the problem of surface damage of the core rod 2 caused by traditional clamps.

[0029] Optionally, the rotating cutting unit comprises a mounting seat 7 fixedly installed on the surface of the fixed table 3, a through hole is formed in the center of the surface of the mounting seat 7, an installation shaft 8 is fixedly installed on the inner surface of the through hole, the two ends of the installation shaft 8 both extend to the outside of the through hole, the installation shaft 8 has a cavity through which the mandrel 2 can pass, a ring-shaped cutting base 9 is rotatably connected to the installation shaft 8 near the side of the floating table 4 through a bearing, a rotating handle 10 is fixedly installed on the outer side of the cutting base, a cutting hole 11 through which the mandrel 2 can pass is formed in the center of the surface of the ring-shaped cutting base 9, a cutting knife 12 is movably installed on the inner wall of the cutting hole 11, a threaded hole is formed in the ring-shaped wall of the ring-shaped cutting base 9, a screw rod 13 is threadedly connected in the threaded hole, the screw rod 13 can rotate and relatively displace in the threaded hole, the cutting knife 12 is fixedly installed on one end of the screw rod 13 located in the cutting hole 11, and a three-jaw chuck 14 is fixedly installed on the installation shaft 8 away from the side of the floating table 4, the three-jaw chuck 14 is used for fixing the mandrel 2 at the current position.

[0030] Specifically, as shown in the figure, Figures 1-3 the mounting seat 7 is installed on the surface of the fixed table 3 by bolt fixing or welding, the center through hole and the installation shaft 8 are fixed by interference fit or flange connection, one end of the installation shaft 8 is rotatably connected to the ring-shaped cutting base 9 through a bearing, the other end is fixedly connected to the three-jaw chuck 14, and the rotating handle 10 on the outer side of the cutting base can be provided in plurality and symmetrically distributed for manual operation.

[0031] The cutting knife 12 is fixed to the front end of the screw rod 13 by screws or special clamps, when the screw rod 13 is rotated, the cutting knife 12 can make radial feeding motion along the inner wall of the cutting hole 11, through the cooperation of the thread lead and the number of rotation of the screw rod 13, the accurate control of the cutting depth of the cutting knife 12 can be realized, the three-jaw chuck 14 is driven by manual or pneumatic driving mode, and the centering clamping of the mandrel 2 is realized by the synchronous closing of the three clamping jaws.

[0032] In this embodiment, when the mandrel 2 passes through the inner cavity of the installation shaft 8, it is first accurately positioned and fixed by the three-jaw chuck 14, the operator drives the cutting base to rotate uniformly around the axis of the mandrel 2 through the rotating handle 10, and simultaneously accurately adjusts the feeding amount of the screw rod 13 according to the scale indication, so that the cutting knife 12 can scratch a ring-shaped scratch with uniform depth on the surface of the mandrel 2. This mechanical ring cutting device replaces the operation mode of the traditional manual chain cutter, eliminates the problem of different scratch depths caused by different manual skills, and also ensures the continuity and consistency of the ring-shaped scratch, laying a foundation for subsequent accurate breaking.

[0033] In particular, the bearing structure ensures the stability of the ring cutting process, avoids radial runout, the screw rod 13 feeding mechanism provides reliable depth control means to prevent overcutting or insufficient cutting, the centering clamping function of the three-jaw chuck 14 avoids axial movement of the mandrel 2 during processing, ensures the accuracy and repeatability of the ring cutting process, and solves the quality fluctuation problem caused by manual operation.

[0034] Optionally, the breaking execution unit comprises a bottom support frame 15, a sliding rail 16 is fixedly installed on the bottom support frame 15, a sliding block 17 is slidingly installed on the sliding rail 16, the floating table 4 is fixedly installed on the sliding block 17, an air hammer 18 is fixedly installed on the side wall of one end of the bottom support frame 15, the output end of the air hammer 18 and one side of the floating table 4 abut each other, and a limiting plate 19 is fixedly installed on the side wall of the other end of the bottom support frame 15. The limiting plate 19 is used to limit the displacement distance of the floating table 4 on the bottom support frame 15.

[0035] Specifically, as shown in Figures 1-2 the bottom support frame 15 is fixed to the base of the rack 1 by anchor bolts or welding, the sliding rail 16 is installed on the surface of the support table by bolt connection, the floating table 4 is firmly connected with the upper surface of the sliding block 17 by bolts, so that the floating table 4 can slide along the sliding rail 16 in the axial direction of the sliding block 17, the air hammer 18 is fixed on one end of the bottom support frame 15 by a mounting bracket, the piston rod end of the air hammer 18 is in contact with the side wall of the floating table 4 but does not exert a pre-tightening force, and the limiting plate 19 is adjustably installed on the other end of the support table by bolts. By adjusting the installation position, the maximum displacement stroke of the floating table 4 can be accurately controlled.

[0036] In this embodiment, when the mandrel 2 completes the ring cutting and marking, the control system triggers the air hammer 18 to act, the piston rod of the air hammer 18 instantaneously extends, and an instantaneous impact force is applied to the side wall of the floating table 4. The impact force is converted into the accurate lateral displacement of the floating table 4 relative to the fixed table 3 through the sliding block 17 and the sliding rail 16 mechanism, so as to exert a bending moment perpendicular to the axis on the mandrel 2 segment supported on the floating table 4. Since the mandrel 2 on the side of the fixed table 3 has been firmly constrained, the mandrel 2 on the side of the floating table 4 is subjected to controllable bending under the impact, so that the stress is concentrated at the ring-shaped marking, and precise breaking is achieved.

[0037] Particularly, the slide rail 16 and the slide block 17 mechanism ensure the straightness and repeatability of the movement trajectory of the floating table 4, avoid the deviation of the fracture surface caused by lateral shaking, the instantaneous impact force provided by the air hammer 18 effectively overcomes the fracture toughness of the mandrel 2 material, and by adjusting the working pressure of the air hammer 18 and the position of the limiting plate 19, the impact strength and displacement stroke can be accurately controlled, which is suitable for the cutting requirements of mandrels 2 of different diameters and materials. The limiting plate 19 not only prevents damage to the equipment caused by overshoot, but also ensures the consistency of each fracture operation, replaces the traditional manual knocking method, realizes the mechanization and controllability of the fracture process, and solves the problems of fracture surface quality and product loss caused by uneven manual force.

[0038] A cutting method of a mandrel cutting device for optical fiber preform based on the above, comprising the following steps: S1: mandrel 2 feeding and positioning, placing the mandrel 2 to be cut on the mandrel supporting and clamping unit, so that it is supported by the supporting roller 5 along the length direction and located at the predetermined cutting station; S2: mandrel 2 clamping and fixing, starting the pneumatic jaw assembly 6, driving the jaw arm 603 to move synchronously, clamping and fixing the mandrel 2 from the side or end through the annular groove on the clamping block 604, and assisting the mandrel 2 to be fixed through the three-jaw chuck 14; S3: forming a ring cut mark, adjusting the feed depth of the screw 13 in the rotary cutting unit, driving the cutting knife 12 to accurately displace to the predetermined cutting position, driving the rotary handle 10 to make the annular cutting base 9 drive the cutting knife 12 to rotate around the axis of the mandrel 2, and cutting a complete and uniform annular mark on the outer surface of the mandrel 2; S4: offset fracture execution, starting the fracture execution unit, controlling the air hammer 18 to output an instantaneous impact force, driving the floating table 4 to quickly offset relative to the fixed table 3 along the slide rail 16, so as to apply an instantaneous offset force perpendicular to the length direction of the mandrel 2 to the mandrel 2 on the floating table 4, and make the mandrel 2 fracture neatly from the annular mark; S5: cutting is completed and discharged, after the fracture is completed, the pneumatic jaw assembly 6 and the three-jaw chuck 14 are loosened, the mandrel 2 segment that has completed the cutting is taken out, and the cutting operation is completed.

[0039] Specifically, the fiber preform rod core rod 2 to be slitting is horizontally placed on the support roller 5 of the core rod supporting and clamping unit, the core rod 2 is preliminarily positioned through the V-shaped or U-shaped supporting structure of the roller, it is ensured that the axis of the core rod 2 coincides with the axis of the equipment, and the pre-determined slitting position is aligned with the machining area of the rotary cutting unit, the cylinder 601 of the pneumatic jaw assembly 6 is started, the two jaw arms 603 are driven to move synchronously and oppositely, the annular groove on the clamping block 604 is laterally embraced from the core rod 2, and a uniformly distributed circumferential clamping force is formed, at the same time, the three-jaw chuck 14 is adjusted so that the jaws are closed, the core rod 2 is centered and clamped from the end, through the cooperation of the pneumatic jaw and the three-jaw chuck 14, the core rod 2 is completely fixed in the axial and radial directions, a stable reference is provided for subsequent precision machining, the screw rod 13 in the rotary cutting unit accurately controls the radial feed amount of the cutting knife 12 through threaded transmission, so that the cutting knife 12 reaches the pre-set scratch depth, the rotary handle 10 is manually or driven to rotate, the annular cutting base 9 is uniformly rotated around the axis of the core rod 2, the cutting knife 12 cuts out a continuous and uniform annular scratch on the surface of the core rod 2, through the precise feeding of the screw rod 13 and the stable rotation of the cutting base, it is ensured that the scratch depth is consistent and has no breakpoints, and an accurate stress concentration point is provided for subsequent fracture, the air hammer 18 of the fracture execution unit is started, the piston rod of the air hammer 18 is instantaneously extended, a controllable instantaneous impact force is applied to the side wall of the floating table 4, the floating table 4 is quickly offset along the slide rail 16 under the pushing of the air hammer 18, the core rod 2 segment clamped thereon is driven to produce transverse displacement, and the core rod 2 segment on the opposite fixed table 3 remains fixed, the relative movement makes the core rod 2 bear bending stress at the annular scratch, when the stress exceeds the material strength, the core rod 2 is neatly fractured along the scratch line, through adjusting the impact force of the air hammer 18 and the position of the limiting plate 19, the impact strength and displacement amount of the fracture process can be accurately controlled, the pneumatic jaw assembly 6 and the three-jaw chuck 14 are loosened at the same time, the constraint on the core rod 2 is released, the operator takes out the slitted core rod 2 segment from the support roller 5, and the whole slitting operation is completed. The cross section of the slitted core rod 2 is smooth and flat, and does not need secondary processing to meet the requirements of the subsequent handle connecting process.

[0040] Optionally, in step S3, the feed depth of the cutting knife 12 is positioned and adjusted through the scale line arranged on the screw rod 13, so as to ensure that the depth of the annular scratch is consistent.

[0041] Specifically, the thread lead of the screw rod 13 is calculated, the corresponding displacement amount of the cutting tip is fixed for each rotation, the scale ring is uniformly distributed in the circumferential direction of the screw rod 13, the rotation angle can be accurately read through the pointer or the marking line, and then the exact feed depth is obtained, the operator can accurately control the depth of the cutting knife 12 cutting into the surface of the core rod 2 according to the target scratch depth set according to the material and diameter of the core rod 2 by rotating the screw rod 13 to the corresponding scale position.

[0042] In the embodiment, when performing the ring cutting scoring process, the operator first rotates the screw 13 according to the process parameters, so that the cutting knife 12 is radially fed to a predetermined scale position. During the rotation of the cutting knife 12 around the mandrel 2 driven by the ring cutting base 9, the self-locking characteristic of the screw 13 can keep the feeding depth constant, ensuring that the formed ring score has uniform circumferential depth, eliminating the problem of uneven score depth caused by different hand feelings during manual operation, and providing a high-quality stress concentration line for the subsequent breaking process.

[0043] More specifically, the minimum scale value of the scale ring is optimized and designed to meet the accuracy requirements of the score depth of different specifications of the mandrel 2. Through the depth-controllable ring cutting process, it not only ensures that the score has sufficient depth to guide the breaking, but also avoids damaging the structural strength of the mandrel 2 or causing cracks due to cutting too deep, improves the consistency of the cutting quality, and solves the problems of broken surface skew and unexpected breaking caused by score depth fluctuation in the traditional process.

[0044] Optionally, in step S4, the impact force of the air hammer 18 or the displacement distance of the floating table 4 is adjustable to adapt to the cutting requirements of mandrels 2 of different diameters and materials. The offset movement of the floating table 4 is limited within the preset displacement stroke by the limiting action of the limiting plate 19.

[0045] Specifically, a precision pressure regulating valve is arranged in the air inlet circuit of the air hammer 18, which can steplessly adjust the impact force within the set range by adjusting the air pressure value. The limiting plate 19 can be adjusted in position on the support table and is equipped with a scale indicating device, which can accurately set and display the allowable displacement amount of the floating table 4. The operator can match and set the corresponding impact force and displacement limit value according to the diameter, material properties and score depth of the mandrel 2 and other process parameters.

[0046] In the embodiment, when performing the breaking process, the operator first sets the working pressure of the air hammer 18 and the position of the limiting plate 19 according to the specifications of the mandrel 2. After starting the air hammer 18, the output impact force of the air hammer 18 drives the floating table 4 to move along the slide rail 16, and the limiting plate 19 accurately limits the final position of the floating table 4 as a mechanical stop. Through the coordinated control of the impact force and the displacement amount, it can ensure that the breaking energy applied to the mandrel 2 is in the optimal range, which is sufficient to make the mandrel 2 break along the score neatly, and avoids damage to the broken surface or breaking from the non-scored part due to excessive energy.

[0047] More specifically, the pressure adjusting mechanism of the air hammer 18 and the displacement adjusting mechanism of the limiting plate 19 work independently and cooperatively, forming a double guarantee for the breaking process. The adjustable design enables the device to adapt to the breaking needs of various core rods 2 from standard specifications to special types. Through parameter optimization, the best breaking effect of core rods 2 of different materials can be achieved. Compared with traditional manual knocking, this controllable mechanical breaking method eliminates the quality fluctuations caused by human subjective factors, significantly improving the breaking yield and the consistency of the cross-section quality.

[0048] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Any skilled person in the art can make many possible changes, modifications, or equivalent embodiments of the above technical content without departing from the scope of the present application. Therefore, any modification, change, and modification of the above embodiments within the scope of the present application are all within the protection scope of the present application.

Claims

1. A fiber optic preform core slitting device, characterized in that, The utility model relates to a kind of core rod cutting device, including: Rack (1), fixed platform (3) for supporting core rod (2) and floating platform (4) for breaking core rod (2) are provided on the rack (1); Core rod support clamping unit, the core rod support clamping unit is positioned and fixed for the position where core rod (2) is located, and is arranged on the fixed platform (3) and floating platform (4) and along the length direction of core rod (2); Rotary cutting unit, the rotary cutting unit is arranged on the fixed platform (3), and the rotary cutting unit can rotate along the axis of the core rod (2), and complete annular score is cut out on the outer surface of core rod (2); Breaking execution unit, the breaking execution unit is arranged on the rack (1), and the output end of the breaking execution unit can drive the position where the floating platform (4) is located to be offset relative to the position where the fixed platform (3) is located, to exert offset force perpendicular to the length direction of core rod (2) on core rod (2) on the floating platform (4), so that core rod (2) is broken along annular score on the outer surface of core rod (2).

2. A device for slicing a core rod of an optical fiber preform according to claim 1, wherein The core rod support clamping unit includes at least one set of support roller (5) for supporting core rod (2) and a plurality of pneumatic jaw assemblies (6) for clamping from both ends of core rod (2) or laterally of core rod (2), two support rollers (5) are fixedly installed on the table surface of the fixed platform (3) and the floating platform (4) respectively, the pneumatic jaw assembly (6) includes a gas cylinder (601), a gas cylinder (601) mounting rack is fixedly installed on the outer side of the gas cylinder (601), the gas cylinder (601) mounting rack is fixedly installed on the table surface of the fixed platform (3) and the floating platform (4) respectively, two mutually cooperating jaw arms (603) are drivingly connected on the output end of the gas cylinder (601), the gas cylinder (601) drives two mutually cooperating jaw arms (603) to move synchronously to complete clamping or opening of core rod (2).

3. A device for slicing a core rod of an optical fiber preform according to claim 2, wherein Two mutually cooperating jaw arms (603) are fixedly installed with clamping blocks (604), two annular grooves are formed on the mutually close side surfaces of two clamping blocks (604), two annular grooves are abutted to form clamping part matched with the outer contour of core rod (2), and two clamping blocks (604) are made of Teflon material.

4. The optical fiber preform rod slitting apparatus according to claim 1, wherein, The rotating cutting unit comprises a mounting seat (7) fixedly mounted on the surface of the fixed table (3), a through hole is formed at the center of the surface of the mounting seat (7), an installation shaft (8) is fixedly mounted on the inner surface of the through hole, both ends of the installation shaft (8) extend out of the through hole, the inside of the installation shaft (8) has a cavity for the core rod (2) to pass through, a ring-shaped cutting base (9) is rotatably connected to the installation shaft (8) near the side of the floating table (4) through a bearing, a rotating handle (10) is fixedly mounted on the outer side of the cutting base, a cutting hole (11) for the core rod (2) to pass through is formed at the center of the surface of the ring-shaped cutting base (9), a cutting knife (12) is movably mounted on the inner wall of the cutting hole (11), a threaded hole is formed in the annular wall of the ring-shaped cutting base (9), a screw rod (13) is screwedly connected in the threaded hole, the screw rod (13) can rotate and relatively displace in the threaded hole, the cutting knife (12) is fixedly mounted at one end of the screw rod (13) located in the cutting hole (11), and a three-jaw chuck (14) is fixedly mounted on the installation shaft (8) away from the side of the floating table (4), the three-jaw chuck (14) is used for fixing the core rod (2) at the current position.

5. The apparatus for slicing a core rod of an optical fiber preform according to claim 1, wherein The breaking execution unit comprises a bottom support frame (15), a sliding rail (16) is fixedly mounted on the bottom support frame (15), a sliding block (17) is slidably mounted on the sliding rail (16), the floating table (4) is fixedly mounted on the sliding block (17), an air hammer (18) is fixedly mounted on the side wall of one end of the bottom support frame (15), the output end of the air hammer (18) abuts against one side of the floating table (4), and a limiting plate (19) is fixedly mounted on the side wall of the other end of the bottom support frame (15), the limiting plate (19) is used for limiting the displacement distance of the floating table (4) on the bottom support frame (15).

6. A method of splitting a core of a fiber preform according to any one of claims 1 to 5, characterized by, The method comprises the following steps: S1: core rod loading and positioning, the core rod of the optical fiber preform to be slitting is placed on the core rod supporting and clamping unit, so that it is supported by the supporting rollers in the length direction and located at the predetermined slitting station; S2: core rod clamping and fixing, the pneumatic jaw assembly is started, the jaw arms are driven to move synchronously, the core rod is clamped and fixed from the side or the end through the annular groove on the clamping block, and the core rod is auxiliary fixed through the three-jaw chuck; S3: ring cutting and marking formation, the feeding depth of the screw rod in the rotating cutting unit is adjusted, the cutting knife is accurately displaced to the predetermined cutting position, the rotating handle is driven, the ring-shaped cutting base drives the cutting knife to rotate around the core rod axis, and a complete and uniform annular mark is cut on the outer surface of the core rod; S4: offset breaking execution, the breaking execution unit is started, the instantaneous impact force of the air hammer is controlled, the floating table is pushed to quickly offset relative to the fixed table along the sliding rail, so that an instantaneous offset force perpendicular to the length direction of the core rod is applied to the core rod on the floating table, and the core rod is neatly broken from the annular mark. S5: after the cutting is completed, the pneumatic clamping jaw assembly is loosened from the three-jaw chuck, the cut core rod segment is taken out, and the cutting operation is completed.

7. A method of and apparatus for slicing a core rod for an optical fiber preform as defined in claim 6, wherein In step S3, the feed depth of the cutting knife is positioned and adjusted by the scale line provided on the screw rod to ensure the consistency of the depth of the annular score.

8. A method of and apparatus for slicing a core rod for an optical fiber preform as defined in claim 6, wherein In step S4, the impact force of the air hammer or the displacement distance of the floating table can be adjusted to adapt to the cutting requirements of core rods of different diameters and materials, and the offset movement of the floating table is limited within the preset displacement stroke by the limiting action of the limiting plate.

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