Optical fiber preform clamping device and its clamping method

Abstract

The present invention provides an optical fiber preform clamping device and a clamping method thereof. The optical fiber preform clamping device includes a base, a driving mechanism and a fixture; the driving mechanism is arranged on the base, and a first moving end and a second moving end of the driving mechanism are arranged oppositely along a first direction; the fixture includes a first clamping mold and a second clamping mold, the first clamping mold is arranged on the first moving end, the second clamping mold is arranged on the second moving end, a clamping opening is formed between opposite side surfaces of the first clamping mold and the second clamping mold, the clamping opening is used to extend along the axial direction of the optical fiber preform, and the clamping surface of the clamping opening is used to fit with the side surface of the optical fiber preform; wherein, the driving mechanism has a first state and a second state, in the first state, the clamping surface of the clamping opening fits with the side surface of the optical fiber preform; in the second state, the clamping surface of the clamping opening is separated from the side surface of the optical fiber preform. The present invention realizes stable clamping of the optical fiber preform by providing a fixture adapted to the side surface of the optical fiber preform.

Description

Technical Field

[0001] The present invention relates to the technical field of fiber preform processing, and particularly relates to a clamping device for a fiber preform and a clamping method thereof. Background Art

[0002] During the processing of a fiber preform, one end of the polished fiber preform needs to be welded to one end of a glass handle rod. The technological requirement during the welding process is to ensure that the fiber preform and the glass handle rod are coaxially arranged.

[0003] Currently, when welding a fiber preform, the fiber preform and the glass handle are respectively fixed on two three-jaw chucks. The centers of the two three-jaw chucks coincide, so that the axis of the fiber preform can be coaxially arranged with the glass handle. After the three-jaw chuck is tightened, the welding operation of the fiber preform and the glass handle is carried out. However, in actual production, the three-jaw chuck is only suitable for clamping round shaft parts. When clamping a part with a plane or an edge, since the angle between two adjacent jaws of the three-jaw chuck is 120°, the clamping position of the three-jaw chuck cannot be adjusted adaptively. The cross-sectional shape of the fiber preform includes a square, a regular hexagon or a regular octagon. When the three-jaw chuck clamps the fiber preform with the above cross-sectional shape, at least one clamping position of a jaw is an edge. Then, the three-jaw chuck cannot stably clamp the fiber preform, resulting in the axis of the fiber preform being prone to shift during the welding process, which does not meet the welding process requirements. Summary of the Invention

[0004] The present invention provides a clamping device for a fiber preform and a clamping method thereof to solve the problem that the existing chuck cannot stably clamp the fiber preform when clamping the fiber preform.

[0005] The present invention provides a clamping device for a fiber preform, including: a base, a driving mechanism and a fixture; the driving mechanism is arranged on the base, the driving mechanism has a first moving end and a second moving end, and the first moving end and the second moving end are arranged oppositely along a first direction; the fixture includes a first clamping mold and a second clamping mold, the first clamping mold is arranged on the first moving end, the second clamping mold is arranged on the second moving end, a clamping opening is formed between the opposite side surfaces of the first clamping mold and the second clamping mold, the clamping opening is used to extend along the axial direction of the fiber preform, and the clamping surface of the clamping opening is used to adapt to the side surface of the fiber preform; wherein, the driving mechanism has a first state and a second state. In the first state, the clamping surface of the clamping opening is attached to the side surface of the fiber preform; in the second state, the clamping surface of the clamping opening is separated from the side surface of the fiber preform.

[0006] According to a fiber preform clamping device provided by the present invention, a first groove is provided on a side surface of the first clamping die close to the second clamping die, and the first groove is used to extend along the axial direction of the fiber preform; a second groove is provided on a side surface of the second clamping die close to the first clamping die, and the second groove is used to extend along the axial direction of the fiber preform; a clamping port is formed between the first groove and the second groove.

[0007] According to a fiber preform clamping device provided by the present invention, the first groove and the second groove have the same structure, and the cross-sectional shape of the first groove in a plane perpendicular to the axis of the fiber preform is an isosceles trapezoid.

[0008] According to a fiber preform clamping device provided by the present invention, the fixture includes a first cushion block and a second cushion block; the first cushion block is detachably provided on a side of the first clamping die close to the second clamping die, and a third groove is provided on a side surface of the first cushion block close to the second clamping die, and the third groove is used to extend along the axial direction of the fiber preform; the second cushion block is detachably provided on a side of the second clamping die close to the first clamping die, and a fourth groove is provided on a side surface of the second cushion block close to the first clamping die, and the fourth groove is used to extend along the axial direction of the fiber preform; a clamping port is formed between the third groove and the fourth groove.

[0009] According to a fiber preform clamping device provided by the present invention, the third groove and the fourth groove have the same structure; a plurality of the first cushion blocks and the second cushion blocks are provided in one-to-one correspondence, and the sizes of the cross-sections of the third grooves of any two of the first cushion blocks in a plane perpendicular to the axis of the fiber preform are different from each other; a plurality of the second cushion blocks are provided, and the sizes of the cross-sections of the fourth grooves of any two of the second cushion blocks in a plane perpendicular to the axis of the fiber preform are different from each other.

[0010] An optical fiber preform clamping device provided according to the present invention, the driving mechanism includes a connecting rod assembly and a driving handle; the connecting rod assembly includes a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod; a first end of the first connecting rod and a second end of the second connecting rod are hinged at a first hinge point on the first moving end, a first end of the second connecting rod is hinged to a second end of the third connecting rod, a first end of the third connecting rod and a second end of the fourth connecting rod are hinged at a second hinge point on the second moving end, and a first end of the fourth connecting rod and a second end of the first connecting rod are hinged at a third hinge point on the driving handle; the base is cylindrical, and the connecting rod assembly is arranged inside the base; a first guiding member is formed on a side of the first moving end away from the first clamping die along the first direction; a second guiding member is formed on a side of the second moving end away from the second clamping die along the first direction; an end of the first guiding member away from the first clamping die is slidably connected to the base, and an end of the second guiding member away from the second clamping die is slidably connected to the base; the driving handle is arranged along a second direction, and the second direction is perpendicular to the first direction; one end of the driving handle is slidably connected to the base; the driving handle is used to drive the third hinge point to move along the second direction

[0011] An optical fiber preform clamping device provided according to the present invention, both the first guiding member and the second guiding member are rod-shaped, a first guiding hole and a second guiding hole are oppositely formed on a side wall of the base, one end of the first guiding member passes through the first guiding hole, and one end of the second guiding member passes through the second guiding hole.

[0012] An optical fiber preform clamping device provided according to the present invention, the driving handle includes an adapter seat and a screw; a threaded hole is formed on the base; the third hinge point is located at one end of the adapter seat, the other end of the adapter seat is rotatably connected to one end of the screw, a limiting structure is formed between the adapter seat and the screw, and the limiting structure is used to limit the relative movement between the screw and the adapter seat in the second direction; the middle of the screw is threadedly connected to the threaded hole, and the other end of the screw extends out of the base.

[0013] The present invention also provides a clamping method for an optical fiber preform clamping device, including: S1, fixing the base on a three-jaw chuck, and placing the optical fiber preform to be clamped at the clamping opening of the fixture; S2, according to the cross-sectional size of the optical fiber preform to be clamped, controlling the first moving end and the second moving end of the driving mechanism to move towards each other to clamp the optical fiber preform to be clamped at the clamping opening of the fixture.

[0014] According to the clamping method provided by the present invention, S2 further includes: S21, determining the size of the clamping opening between the first clamping mold and the second clamping mold; S22, when the size of the clamping opening between the first clamping mold and the second clamping mold matches the size of the optical fiber preform to be clamped, clamping the optical fiber preform to be clamped with the clamping opening between the first clamping mold and the second clamping mold; S23, when the size of the clamping opening between the first clamping mold and the second clamping mold does not match the size of the optical fiber preform to be clamped, selecting the first spacer and the second spacer according to the size of the optical fiber preform to be clamped, installing the first spacer on the first clamping mold, installing the second spacer on the second clamping mold, and clamping the optical fiber preform to be clamped with the clamping opening between the first spacer and the second spacer.

[0015] An optical fiber preform clamping device and a clamping method provided by the present invention, by arranging a driving mechanism and a fixture on a base, during the process of clamping the optical fiber preform, driving the first clamping mold and the second clamping mold to approach each other through the driving mechanism, the clamping opening of the first clamping mold and the second clamping mold can clamp the optical fiber preform, and ensure that the clamping surface of the clamping opening fits the side surface of the optical fiber preform, that is, the clamped part of the first clamping mold and the second clamping mold is the side surface of the optical fiber preform, avoiding the phenomenon of unstable clamping when clamping the edge; here, by replacing different first clamping molds and second clamping molds, the present invention can make the mold stably clamp optical fiber preforms with various cross-sectional shapes, avoiding the phenomenon that the axis of the optical fiber preform is prone to shift during the fusion splicing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 is a schematic structural diagram of the optical fiber preform clamping device provided by the present invention;

[0018] Figure 2 is a schematic structural diagram of the optical fiber preform clamping device provided by the present invention installed on a three-jaw chuck;

[0019] Figure 3 is a schematic structural diagram of the optical fiber preform clamping device provided by the present invention when clamping an optical fiber preform with a regular decagon cross-section;

[0020] Figure 4 is a schematic structural diagram of the optical fiber preform clamping device provided by the present invention when clamping an optical fiber preform with a regular octagon cross-section;

[0021] Figure 5 It is a schematic structural diagram of the fiber preform clamping device provided by the present invention when clamping a fiber preform with a regular hexagon cross-section;

[0022] Figure 6 It is a schematic structural diagram of the fiber preform clamping device provided by the present invention when using the first first cushion block and second cushion block;

[0023] Figure 7 It is a schematic structural diagram of the fiber preform clamping device provided by the present invention when using the second first cushion block and second cushion block;

[0024] Figure 8 It is a schematic structural diagram of the driving handle provided by the present invention;

[0025] Figure 9 It is one of the schematic flow diagrams of the clamping method provided by the present invention

[0026] Figure 10 It is the second schematic flow diagram of the clamping method provided by the present invention;

[0027] Reference numerals:

[0028] 1: Preform clamping device; 2: Fiber preform; 3: Three-jaw chuck;

[0029] 11: Base; 12: Driving mechanism; 13: Fixture;

[0030] 111: First guiding hole; 112: Second guiding hole; 113: Threaded hole;

[0031] 121: Link assembly; 122: Driving handle; 131: First clamping die;

[0032] 132: Second clamping die; 133: First cushion block; 134: Second cushion block;

[0033] 1211: First link; 1212: Second link; 1213: Third link;

[0034] 1214: Fourth link; 1221: Adapter seat; 1222: Limit structure;

[0035] 1223: Screw; 1311: First groove; 1312: First guide;

[0036] 1321: Second groove; 1322: Second guide; 1331: Third groove;

[0037] 1341: Fourth groove. Detailed implementation manners

[0038] To make the objectives, technical solutions and advantages of the present invention more clear, the following will clearly and completely describe the technical solutions in the present invention in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts fall within the scope of protection of the present invention.

[0039] The following will describe Figures 1 to 10 a fiber preform clamping device and a clamping method provided by the present invention.

[0040] As Figures 1 to 8 shown, this embodiment provides a fiber preform clamping device. The fiber preform clamping device 1 includes: a base 11, a driving mechanism 12 and a fixture 13; the driving mechanism 12 is arranged on the base 11, the driving mechanism 12 has a first moving end and a second moving end, and the first moving end and the second moving end are arranged oppositely along a first direction; the fixture 13 includes a first clamping die 131 and a second clamping die 132, the first clamping die 131 is arranged on the first moving end, the second clamping die 132 is arranged on the second moving end, a clamping opening is formed between the opposite side surfaces of the first clamping die 131 and the second clamping die 132, the clamping opening is used to extend along the axial direction of the fiber preform 2, and the clamping surface of the clamping opening is used to fit the side surface of the fiber preform 2; wherein, the driving mechanism 12 has a first state and a second state. In the first state, the clamping surface of the clamping opening is in contact with the side surface of the fiber preform 2; in the second state, the clamping surface of the clamping opening is separated from the side surface of the fiber preform 2.

[0041] Specifically, as Figure 2 shown, this embodiment can fix the base 11 on a three-jaw chuck. By arranging the driving mechanism 12 and the fixture 13 on the base 11, during the process of clamping the fiber preform 2, the driving mechanism 12 is used to drive the first clamping die 131 and the second clamping die 132 to approach the fiber preform 2 until the clamping surface is in contact with the side surface of the fiber preform 2, that is, the clamped part of the first clamping die 131 and the second clamping die 132 is the side surface of the fiber preform 2, avoiding the phenomenon of unstable clamping when clamping the edge; by replacing different first clamping dies 131 and second clamping dies 132, the fixture 13 can stably clamp fiber preforms 2 with various cross-sectional shapes, avoiding the phenomenon that the axis of the fiber preform 2 is prone to shift during the welding process.

[0042] It should be noted here that the first direction is the direction in which the first clamping die 131 and the second clamping die 132 approach or move away from each other.

[0043] Meanwhile, the driving mechanism 12 shown in this embodiment may be a clamping mechanism. The clamping mechanism may be composed of two linearly driving mechanisms arranged oppositely, so that the first moving end and the second moving end are respectively two driving ends arranged oppositely on the clamping mechanism. The linearly driving mechanism includes any one of a hydraulic cylinder, a pneumatic cylinder or a linear motor, and the two linearly driving mechanisms may be installed on the base. The driving end of one linearly driving mechanism is connected to the first clamping die 131, and the driving end of the other linearly driving mechanism is connected to the second clamping die 132. When the driving ends of the two linearly driving mechanisms move towards or away from each other, the first clamping die 131 and the second clamping die 132 can be driven to approach or separate from each other. Among them, the driving mechanism 12 may also be in other structural forms, which will not be listed one by one here.

[0044] As Figure 3 shown, in one embodiment, the driving mechanism 12 is in the first state, and the clamping surface is attached to the side surface of the optical fiber preform 2.

[0045] As Figure 1 shown, in one embodiment, the driving mechanism is in the second state, and the clamping surface is separated from the side surface of the optical fiber preform 2.

[0046] Preferably, as Figures 1 to 7 shown, on one side of the first clamping die 131 close to the second clamping die 132 in this embodiment, a first groove 1311 is provided, and the first groove 1311 is used to extend along the axis direction of the optical fiber preform 2; on one side of the second clamping die 132 close to the first clamping die 131, a second groove 1321 is provided, and the second groove 1321 is used to extend along the axis direction of the optical fiber preform 2; a clamping opening is formed between the first groove 1311 and the second groove 1321. It can be understood that the groove walls of the first groove 1311 and the second groove 1321 are adapted to the side surface of the optical fiber preform 2.

[0047] Preferably, as Figures 1 to 7 shown, the first groove 1311 and the second groove 1321 shown in this embodiment have the same structure. The cross-sectional shape of the first groove 1311 in a plane perpendicular to the axis of the optical fiber preform 2 is an isosceles trapezoid, that is, the angles between the groove bottom of the first groove 1311 and the two side walls are equal.

[0048] In one embodiment, as Figure 3 shown, if the cross-sectional shape of the optical fiber preform 2 to be clamped is a regular decagon, then the included angle between the two side walls of the first groove 1311 is α, and the value of α is 72°.

[0049] In another embodiment, as Figure 4 shown, if the cross-sectional shape of the optical fiber preform 2 to be clamped is a regular octagon, then the included angle between the two side walls of the first groove 1311 is β, and the value of β is 90°.

[0050] In yet another embodiment, as Figure 5 shown, the cross-sectional shape of the optical fiber preform 2 to be clamped is a regular hexagon, and the included angle formed by the two side walls of the first groove 1311 is γ, and the value of γ is 60°.

[0051] Preferably, in order to adapt to clamping optical fiber preforms 2 with various different cross-sectional dimensions, the fixture 13 shown in this embodiment further includes a first cushion block 133 and a second cushion block 134; the first cushion block 133 is detachably arranged on one side of the first clamping die 131 close to the second clamping die 132, and a third groove 1331 is arranged on the side surface of the first cushion block 133 close to the second clamping die 132, and the third groove 1331 is used to extend along the axial direction of the optical fiber preform 2; the second cushion block 134 is detachably arranged on one side of the second clamping die 132 close to the first clamping die 131, and a fourth groove 1341 is arranged on the side surface of the second cushion block 134 close to the first clamping die 131, and the fourth groove 1341 is used to extend along the axial direction of the optical fiber preform 2; a clamping opening is formed between the third groove 1331 and the fourth groove 1341.

[0052] In one embodiment, as Figure 6 shown, the cross-sectional dimension of the optical fiber preform 2 to be clamped is small. By installing the first cushion block 133 on the first clamping die 131 and the second cushion block 134 on the second clamping die 132, the third groove 1331 on the first cushion block 133 and the fourth groove 1341 on the second cushion block 134 are in contact with the side surface of the optical fiber preform 2.

[0053] Preferably, the third groove 1331 and the fourth groove 1341 shown in this embodiment have the same structure; a plurality of first cushion blocks 133 and second cushion blocks 134 are provided in a one-to-one correspondence, and the cross-sectional dimensions of the third grooves 1331 of any two first cushion blocks 133 in a plane perpendicular to the axis of the optical fiber preform 2 are different from each other; the cross-sectional dimensions of the fourth grooves 1341 of any two second cushion blocks 134 in a plane perpendicular to the circumferential direction of the optical fiber preform 2 are different from each other, so as to adapt to optical fiber preforms 2 with various cross-sectional shapes.

[0054] In one embodiment, as Figure 6 shown, the cross-sectional shape of the optical fiber preform 2 to be clamped is a regular octagon, then the cross-sectional shape of the third groove 1331 in a plane perpendicular to the axis of the optical fiber preform 2 is an isosceles trapezoid, and the included angle formed by the two side walls of the third groove 1331 is 90°.

[0055] In another embodiment, as Figure 7As shown in the figure, the cross-sectional shape of the optical fiber preform 2 to be clamped is square. Then, the cross-sectional shape of the third groove 1331 in a plane perpendicular to the axis of the optical fiber preform 2 is an isosceles right triangle. To avoid the collision between the edge of the optical fiber preform 2 and the bottom of the third groove 1331, an avoidance groove is provided at the bottom of the third groove 1331. The avoidance groove is used to avoid the edge of the optical fiber preform 2 and prevent the optical fiber preform 2 from being easily damaged by collision during the clamping process.

[0056] Preferably, to achieve the synchronous movement of the first clamping die 131 and the second clamping die 132, the driving mechanism 12 shown in this embodiment includes a link assembly 121 and a driving handle 122; the link assembly 121 includes a first link 1211, a second link 1212, a third link 1213, and a fourth link 1214; the first end of the first link 1211 and the second end of the second link 1212 are hinged at a first hinge point on the first moving end, the first end of the second link 1212 and the second end of the third link 1213 are hinged to each other, the first end of the third link 1213 and the second end of the fourth link 1214 are hinged at a second hinge point on the second moving end, and the first end of the fourth link 1214 and the second end of the first link 1211 are hinged at a third hinge point on the driving handle.

[0057] It should be noted here that the lengths of the first link 1211, the second link 1212, the third link 1213, and the fourth link 1214 are all equal. Adjacent ones are hinged to each other to form a closed four-bar mechanism. When two opposite hinge points approach each other, the other two hinge points move away from each other.

[0058] Preferably, the base 11 shown in this embodiment is cylindrical, and the link assembly 121 is arranged inside the base 11; on one side of the first moving end away from the first clamping die 131, a first guiding member 1312 is formed along a first direction; on one side of the second moving end away from the second clamping die 132, a second guiding member 1322 is formed along the first direction; one end of the first guiding member 1312 away from the first clamping die 131 is slidably connected to the base 11, and one end of the second guiding member 1322 away from the second clamping die 132 is slidably connected to the base 11.

[0059] It should be noted here that the specific connection scheme of the sliding connection is as follows: the first guiding member 1312 is rod-shaped, a guiding hole is provided on the base 11, one end of the first guiding member 1312 extends out of the guiding hole to the outside of the base 11, and the first clamping die 131 moves along the axis direction of the first guiding member 1312 under the guidance of the guiding hole. The second guiding member 1322 has the same structure as the first guiding member 1312, and will not be described in detail here.

[0060] Preferably, the driving handle 122 shown in this embodiment is arranged along the second direction, and the second direction is perpendicular to the first direction; one end of the driving handle is slidably connected to the base 11; the driving handle 122 is used to drive the third hinge point to move along the second direction.

[0061] Preferably, as Figure 1 shown, this embodiment further includes a third guiding member. The axis of the third guiding member is collinear with the axis of the driving handle and is oppositely arranged; the first end of the second link 1212 and the second end of the third link 1213 are hinged to a fourth hinge point on the third guiding member. A guiding hole is formed in the base 11. One end of the third guiding member extends out of the base 11 through the guiding hole, and the third guiding member moves along the axial direction of the third guiding member under the guidance of the guiding hole.

[0062] Specifically, when the driving mechanism 12 is in the first state, the first hinge point and the second hinge point on the link assembly 121 are in a close state, and the third hinge point and the fourth hinge point are in a separated state. At this time, the distance between the third hinge point and the fourth hinge point is a first distance; when the driving mechanism 12 is in the second state, the first hinge point and the second hinge point on the link assembly 121 are in a separated state, and the third hinge point and the fourth hinge point are in a close state. At this time, the distance between the third hinge point and the fourth hinge point is a second distance, and the first distance is greater than the second distance.

[0063] Correspondingly, during the process of the driving mechanism 12 switching from the second state to the first state, the driving handle 122 drives the third hinge point to move along the second direction toward the side away from the optical fiber preform 2, thereby driving the first hinge point and the second hinge point to move along the first direction toward the side close to the optical fiber preform 2, and driving the fourth hinge point to move along the second direction toward the side away from the optical fiber preform 2, so as to realize that the first clamping mold 131 and the second clamping mold 132 approach and fit to the optical fiber preform 2;

[0064] During the process of the driving mechanism 12 switching from the first state to the second state, the driving handle 122 drives the third hinge point to move along the second direction toward the side close to the optical fiber preform 2, thereby driving the first hinge point and the second hinge point to move along the first direction toward the side away from the optical fiber preform 2, and driving the fourth hinge point to move along the second direction toward the side close to the optical fiber preform 2, so as to realize the separation of the first clamping mold 131 and the second clamping mold 132 from the optical fiber preform 2.

[0065] Preferably, as Figures 1 to 5As shown, both the first guide member 1312 and the second guide member 1322 shown in this embodiment are rod-shaped. Oppositely arranged first guide holes 111 and second guide holes 112 are formed on the side wall of the base 11. One end of the first guide member 1312 passes through the first guide hole 111, and one end of the second guide member 1322 passes through the second guide hole 112. It can be understood that the first guide member 1312 moves along the first direction under the guidance of the first guide hole 111, and the second guide member 1322 moves along the first direction under the guidance of the second guide hole 112.

[0066] Preferably, the driving handle 122 shown in this embodiment includes an adapter base 1221 and a screw 1223; a threaded hole 113 is formed on the base 11; the third hinge point is located at one end of the adapter base 1221, and the other end of the adapter base 1221 is rotatably connected to one end of the screw 1223. A limiting structure 1222 is formed between the adapter base 1221 and the screw 1223, and the limiting structure 1222 is used to limit the relative movement between the screw 1223 and the adapter base 1221 in the second direction; the middle part of the screw 1223 is threadedly connected to the threaded hole 113, and the other end of the screw 1223 extends out of the base 11.

[0067] Preferably, a blind hole arranged along the second direction is formed at the other end of the base 11; one end of the screw 1223 is rotatably arranged in the blind hole; the limiting structure 1222 includes an annular groove and a positioning pin. The annular groove is arranged at one end of the screw 1223, and the positioning pin passes through the adapter base 1221 and is stuck in the annular groove, so that the screw 1223 will not be separated from the adapter base 1221 when moving along the second direction, realizing that the screw 1223 pushes or pulls the adapter base 1221 to move along the second direction.

[0068] In one embodiment, as Figure 1 and Figure 8 shown, the limiting structure 1222 is two positioning pins, and the axes of the two positioning pins are arranged in parallel; the adapter base 1221 includes two side plates and a bottom plate. The two side plates are arranged in parallel on one side of the bottom plate. Corresponding hinge holes are formed on the two side plates for hinging the second end of the first link 1211 and the first end of the fourth link 1214. The bottom plate is provided with a blind hole along the second direction, and one end of the screw 1223 rotates in the blind hole. The bottom plate is provided with two through holes along the first direction for installing the positioning pins; an annular groove is formed in the circumferential direction of one end of the screw along the axis of the screw, and the two positioning pins are stuck in the annular groove, realizing that the screw 1223 and the adapter base rotate without separation, so that the screw 1223 and the adapter base 1221 move synchronously along the second direction.

[0069] Preferably, as Figure 9As shown in the figure, this embodiment also provides a clamping method for the optical fiber preform clamping device described above, including: S1, fixing the base 11 on the three-jaw chuck 3, and placing the optical fiber preform 2 to be clamped at the clamping opening of the fixture 13; S2, according to the cross-sectional size of the optical fiber preform 2 to be clamped, controlling the displacement of the first moving end and the second moving end of the driving mechanism 12 to move towards each other, so as to clamp the optical fiber preform 2 to be clamped at the clamping opening of the fixture 13.

[0070] Since the clamping method of the optical fiber preform adopts the optical fiber preform clamping device 1 shown in the above embodiment, the specific structure of the optical fiber preform clamping device 1 refers to the above embodiment. Since the clamping method of the optical fiber preform adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated here one by one.

[0071] Among them, as Figure 10 shown, S2 further includes: S21, determining the size of the clamping opening between the first clamping mold 131 and the second clamping mold 132; S22, when the size of the clamping opening between the first clamping mold 131 and the second clamping mold 132 matches the size of the optical fiber preform 2 to be clamped, using the first clamping mold 131 and the second clamping mold 132 to clamp the optical fiber preform 2 to be clamped; S23, when the size of the clamping opening between the first clamping mold 131 and the second clamping mold 132 does not match the size of the optical fiber preform 2 to be clamped, according to the size of the optical fiber preform 2 to be clamped, selecting the first spacer 133 and the second spacer 134, installing the first spacer 133 on the first clamping mold 131, installing the second spacer 134 on the second clamping mold 132, and using the clamping opening between the first spacer 133 and the second spacer 134 to clamp the optical fiber preform 2 to be clamped.

[0072] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An optical fiber preform clamping device, characterized in that, comprising: a base; a driving mechanism disposed on the base, the driving mechanism having a first moving end and a second moving end, the first moving end and the second moving end being oppositely arranged along a first direction; a clamp, including a first clamping mold and a second clamping mold, the first clamping mold being disposed on the first moving end, the second clamping mold being disposed on the second moving end, a clamping opening being formed between opposite side surfaces of the first clamping mold and the second clamping mold, the clamping opening being adapted to extend along the axial direction of the optical fiber preform, and the clamping surface of the clamping opening being adapted to fit the side surface of the optical fiber preform; wherein, the driving mechanism has a first state and a second state, in the first state, the clamping surface of the clamping opening fits the side surface of the optical fiber preform; in the second state, the clamping surface of the clamping opening is separated from the side surface of the optical fiber preform; the driving mechanism includes a link assembly and a driving handle; the link assembly includes a first link, a second link, a third link and a fourth link; a first end of the first link and a second end of the second link are hinged at a first hinge point on the first moving end, a first end of the second link is hinged to a second end of the third link, a first end of the third link and a second end of the fourth link are hinged at a second hinge point on the second moving end, and a first end of the fourth link and a second end of the first link are hinged at a third hinge point on the driving handle; the base is cylindrical, and the link assembly is disposed inside the base; a first guiding member is formed on a side of the first moving end away from the first clamping mold along the first direction; a second guiding member is formed on a side of the second moving end away from the second clamping mold along the first direction; an end of the first guiding member away from the first clamping mold is slidably connected to the base, and an end of the second guiding member away from the second clamping mold is slidably connected to the base; the driving handle is arranged along a second direction, the second direction being perpendicular to the first direction; one end of the driving handle is slidably connected to the base; the driving handle is used to drive the third hinge point to move along the second direction; the lengths of the first link, the second link, the third link and the fourth link are all equal.

2. The optical fiber preform clamping device according to claim 1, characterized in that, a first groove is provided on a side surface of the first clamping mold close to the second clamping mold, the first groove being adapted to extend along the axial direction of the optical fiber preform; a second groove is provided on a side surface of the second clamping mold close to the first clamping mold, the second groove being adapted to extend along the axial direction of the optical fiber preform; the clamping opening is formed between the first groove and the second groove.

3. The optical fiber preform clamping device according to claim 2, characterized in that, the first groove and the second groove have the same structure, and a cross-sectional shape of the first groove in a plane perpendicular to the axis of the optical fiber preform is an isosceles trapezoid.

4. The optical fiber preform clamping device according to claim 1, It is characterized in that the fixture includes a first cushion block and a second cushion block; the first cushion block is detachably arranged on one side of the first clamping die close to the second clamping die, and a third groove is arranged on one side of the first cushion block close to the second clamping die, and the third groove is used for extending along the axial direction of the optical fiber preform; the second cushion block is detachably arranged on one side of the second clamping die close to the first clamping die, and a fourth groove is arranged on one side of the second cushion block close to the first clamping die, and the fourth groove is used for extending along the axial direction of the optical fiber preform; a clamping port is formed between the third groove and the fourth groove.

5. The optical fiber preform clamping device according to claim 4, It is characterized in that the third groove and the fourth groove have the same structure; a plurality of the first cushion blocks and the second cushion blocks are arranged in a one-to-one correspondence, and the cross-sectional dimensions of the third grooves of any two first cushion blocks in a plane perpendicular to the axis of the optical fiber preform are different from each other; the cross-sectional dimensions of the fourth grooves of any two second cushion blocks in a plane perpendicular to the axis of the optical fiber preform are different from each other.

6. The optical fiber preform clamping device according to claim 1, It is characterized in that both the first guiding member and the second guiding member are rod-shaped, a first guiding hole and a second guiding hole are oppositely formed on the side wall of the base, one end of the first guiding member passes through the first guiding hole, and one end of the second guiding member passes through the second guiding hole.

7. The optical fiber preform clamping device according to claim 6, It is characterized in that the driving handle includes an adapter seat and a screw; a threaded hole is formed on the base; the third hinge point is located at one end of the adapter seat, the other end of the adapter seat is rotatably connected to one end of the screw, a limiting structure is formed between the adapter seat and the screw, and the limiting structure is used for restricting the relative movement of the screw and the adapter seat in the second direction; the middle part of the screw is threadedly connected to the threaded hole, and the other end of the screw extends out of the base.

8. A clamping method for the optical fiber preform clamping device according to any one of claims 1 to 7, It is characterized in that including: S1, fixing the base on a three-jaw chuck, and placing the optical fiber preform to be clamped in the clamping port of the fixture; S2, according to the cross-sectional dimension of the optical fiber preform to be clamped, controlling the first moving end and the second moving end of the driving mechanism to move towards each other, so as to clamp the optical fiber preform to be clamped in the clamping port of the fixture.

9. The clamping method according to claim 8, It is characterized in that S2 further includes: S21, determining the size of the clamping port between the first clamping die and the second clamping die; S22, when the size of the clamping port between the first clamping die and the second clamping die matches the size of the optical fiber preform to be clamped, clamping the optical fiber preform to be clamped by using the clamping port between the first clamping die and the second clamping die. S23. When the size of the clamping opening between the first clamping die and the second clamping die does not match the size of the optical fiber preform to be clamped, select the first spacer and the second spacer according to the size of the optical fiber preform to be clamped, install the first spacer on the first clamping die, install the second spacer on the second clamping die, and clamp the optical fiber preform to be clamped with the clamping opening between the first spacer and the second spacer.

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