Optical fiber preform sleeving device based on RIT

Abstract

The utility model provides an RIT-based optical fiber preform sleeving device, which comprises a tower device, a core rod suspension clamp and a sleeve clamping platform are arranged on the tower device, the relative distance between the core rod suspension clamp and the sleeve clamping platform is adjustable, the core rod suspension clamp is arranged above the sleeve clamping platform, the core rod suspension clamp comprises a swingable taper sleeve, and the taper sleeve is arranged on the tower device. The lower end of the taper sleeve is provided with a rod locking structure, the rod locking structure is used for clamping the upper end of the core rod, the sleeve clamping platform comprises a first translation table capable of horizontally moving, the first translation table is provided with a second translation table capable of horizontally moving, the moving direction of the first translation table is perpendicular to that of the second translation table, and the second translation table is provided with a sleeve clamping device; the sleeve clamping device is used for being connected with the sleeve, and the problem that alignment is difficult when the sleeve and the core rod are connected in a sleeving mode through manual operation is solved.

Description

Technical Field

[0001] The utility model relates to the field of optical fiber preform rod production, in particular to an optical fiber preform rod sleeve connection device based on RIT. Background Art

[0002] Meaning of RIT technology: There is a rod-in-tube method (RIT) in the preparation technology of optical fiber preform, which is one of the conventional methods in optical fiber preparation. In simple terms, a glass rod is inserted into a glass sleeve, the glass tube is heated, and it is melted onto the rod to form a thicker solid rod, that is, the preform of the optical fiber. Finally, one end of the preform is heated and stretched to form an optical fiber.

[0003] The current RIT technology is all done manually without a special fixture, and generally requires two people to complete, which is inefficient. Due to manual operation, it is inevitable that the core rod will scratch the casing due to hand shaking or misalignment during the operation, and bubbles and bright spots are easily formed during the melt shrinkage molding of the solid rod. Utility Model Content

[0004] The utility model provides an optical fiber preform rod sleeve connection device based on RIT, which solves the problem of difficulty in aligning a sleeve and a core rod when sleeved manually.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: an optical fiber preform rod sleeve connection device based on RIT, including a tower device, on which a core rod hanging fixture and a sleeve clamping platform are provided, the relative distance between the core rod hanging fixture and the sleeve clamping platform is adjustable, the core rod hanging fixture is arranged above the sleeve clamping platform, the core rod hanging fixture includes a swingable cone sleeve, a locking rod structure is provided at the lower end of the cone sleeve, the locking rod structure is used to clamp the upper end of the core rod, the sleeve clamping platform includes a first horizontally movable translation platform, a second horizontally movable translation platform is provided on the first translation platform, the moving directions of the first translation platform and the second translation platform are perpendicular, the second translation platform is provided with a sleeve clamping device, and the sleeve clamping device is used to connect the sleeve.

[0006] In the preferred embodiment, the core rod hanging fixture includes a ball joint seat tube, which is a central through structure. A thin neck is provided at one end of the central through structure, and a ball joint portion is provided at one end of the cone sleeve. The ball joint portion is arranged in the ball joint seat tube, and one end of the ball joint portion is abutted against the thin neck. A connecting piece is also provided, and one end of the connecting piece is threadedly connected to the central through structure of the ball joint seat tube and abuts against the ball joint portion.

[0007] In the preferred scheme, a guide rail device and a screw device are provided on one side of the tower device, and a first sliding platform is also provided. The first sliding platform is slidably connected to the guide rail device through a slider, and a nut seat is provided on the side of the first sliding platform close to the tower device, the nut seat is socketed with the screw device, and a synchronous belt assembly is also provided. A rotating drive motor is also provided on the tower device, and the shaft end of the rotating drive motor and the screw device are transmitted through the synchronous belt assembly. A first L-shaped connecting plate is connected to the upper end of the connecting piece, and the first L-shaped connecting plate is connected to the first sliding platform.

[0008] In the preferred embodiment, a connecting cone cylinder is provided at one end of the clamp cylinder, and a plurality of pin holes are provided circumferentially between the cone sleeve and the connecting cone cylinder. The cone sleeve is provided with an inner cone groove, and the connecting cone cylinder is sleeved with the inner cone groove. A pin shaft is also provided, and one end of the pin shaft is inserted into the pin hole and pins the connecting cone cylinder and the cone sleeve.

[0009] In a preferred embodiment, the sleeve clamping platform also includes a second sliding table, which is slidably connected to the guide rail device, and a second L-shaped connecting plate is provided on the second sliding table. A first fine-tuning device is connected between the second L-shaped connecting plate and the first translation table, and a second fine-tuning device is connected between the first translation table and the second translation table. The first fine-tuning device and the second fine-tuning device include a first screw sleeve and a second screw sleeve, and the adjustment screw is threadedly connected to the first screw sleeve and the second screw sleeve respectively, and the first fine-tuning device and the second fine-tuning device are arranged vertically.

[0010] In the preferred solution, one end of the second L-shaped connecting plate is connected to a positioning sleeve, which is slidably sleeved with the guide rail device. A tightening knob is also provided which is threadedly connected to the positioning sleeve, and one end of the tightening knob passes through the positioning sleeve to rest against the guide rail device.

[0011] In the preferred embodiment, a detachable spherical clamp support seat is provided on the sleeve clamping platform, and a detachable spherical clamp is provided on the detachable spherical clamp support seat. The detachable spherical clamp support seat includes a first half sleeve and a second half sleeve hinged at one end, the first half sleeve and the second half sleeve are provided with matching hemispherical arc grooves, a swingable rocker is provided at one end of the first half sleeve away from the hinged end of the second half sleeve, the second half sleeve is provided with a slot seat, the rocker is snapped into the slot seat, a threaded nut is provided on the rocker, and the end of the nut abuts against the slot seat, the detachable spherical clamp includes two matching hemispherical sleeves, and the hemispherical sleeves are provided with semi-arc column grooves.

[0012] In the preferred embodiment, a chuck mounting conical hole is provided at the lower end of the clamp tube, a hollow basic chuck is provided in the chuck mounting conical hole, a plurality of grooves are provided on the side wall of the basic chuck along the circumferential direction, the basic chuck is provided with a rear conical surface that fits with the chuck mounting conical hole, the basic chuck is also provided with a front conical surface, and a locking nut with a threaded connection is sleeved on the end of the driving shaft of the clamp tube, a conical surface supporting portion is provided in the locking nut, and the conical surface supporting portion rests against the front conical surface.

[0013] In a preferred solution, a spacer sleeve with a reducible diameter is provided in the basic chuck, the spacer sleeve comprises a first half sleeve and a second half sleeve, and an avoidance notch is provided between the first half sleeve and the second half sleeve.

[0014] The beneficial effects of the utility model are as follows: the core rod and the sleeve can be adaptively moved vertically downward by the clamp, and the sleeve and the core rod can be adjusted to be coaxial by a platform that can be horizontally moved, thereby assisting the alignment and sleeve connection of the core rod and the sleeve; two slides are used to adjust the relative distance between the core rod and the sleeve in the vertical direction, and the two slides use the same guide rail to ensure that the core rod and the sleeve always remain coaxial during the relative movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 It is a front view of the utility model.

[0017] Figure 2 It is a side view of the utility model.

[0018] Figure 3 It is a structural diagram of the locking rod structure of the utility model.

[0019] Figure 4 It is a structural diagram of the clamp tube of the utility model.

[0020] Figure 5 It is a structural diagram of the ball joint of the utility model.

[0021] Figure 6 It is a schematic diagram of the installation of the rotary drive motor of the utility model.

[0022] Figure 7 It is a schematic diagram of the translation platform of the utility model.

[0023] Figure 8 It is a schematic diagram of a positioning sleeve of the utility model.

[0024] Fig. 9 The utility model is a structural diagram of a detachable spherical clamp support seat.

[0025] Fig.10 It is a structural diagram of a detachable spherical clamp of the utility model.

[0026] Fig.11 It is a cross-sectional view of the lock cap of the utility model.

[0027] Fig.12 It is a schematic diagram of a spacer sleeve of the utility model.

[0028] Fig.13 It is a basic clamping head structure diagram of the utility model.

[0029] In the figure: tower device 1; guide rail device 101; screw device 102; mandrel hanging fixture 2; taper sleeve 201; ball joint 202; ball joint seat tube 203; connector 204; first L-shaped connecting plate 205; first sliding platform 206; waist-shaped hole 207; narrow neck 208; fixture tube 3; chuck mounting taper hole 301; connecting taper tube 302; pin hole 303; pin shaft 304; limit pin 305; locking rod structure 4; basic chuck 401; locking cap 402; spacer 403; first half sleeve 404; second half sleeve 405; avoidance notch 406; rear taper surface 407; front Conical surface 408; conical surface support portion 409; sleeve clamping platform 5; second L-shaped connecting plate 501; second sliding platform 502; first translation platform 503; second translation platform 504; sleeve clamping device 505; first screw sleeve 506; second screw sleeve 507; adjusting screw 508; positioning sleeve 509; tightening knob 510; first half sleeve 511; second half sleeve 512; hemispherical arc groove 513; rocker arm 514; slot seat 515; nut 516; hemispherical sleeve 517; semi-arc column groove 518; rotary drive motor 6; synchronous belt assembly 601; core rod 7; sleeve 8. DETAILED DESCRIPTION

[0030] Embodiment 1:

[0031] like Figure 1-13 In the invention, a RIT-based optical fiber preform sleeve connection device comprises a tower device 1, on which a core rod hanging fixture 2 and a sleeve clamping platform 5 are provided, the relative distance between the core rod hanging fixture 2 and the sleeve clamping platform 5 is adjustable, the core rod hanging fixture 2 is arranged above the sleeve clamping platform 5, the core rod hanging fixture 2 comprises a swingable cone sleeve 201, a locking rod structure 4 is provided at the lower end of the cone sleeve 201, the locking rod structure 4 is used to clamp the upper end of the core rod 7, the sleeve clamping platform 5 comprises a first horizontally movable translation platform 503, on which a second horizontally movable translation platform 504 is provided, the moving directions of the first translation platform 503 and the second translation platform 504 are perpendicular, and on which a sleeve clamping device 505 is provided, the sleeve clamping device 505 is used to connect the sleeve 8.

[0032] Since the core rod 7 is generally longer, its center of gravity is lower, and its upper end can swing freely, the core rod 7 remains in a vertical state under the action of its own weight. Then, the horizontal position of the sleeve clamping device 505 is adjusted by the first translation platform 503 and the second translation platform 504 so that the central axis of the sleeve 8 and the core rod 7 are aligned. Then, the relative distance between the core rod hanging fixture 2 and the sleeve clamping platform 5 is shortened so that the lower end of the core rod 7 is inserted into the sleeve 8.

[0033] In the preferred embodiment, the core rod hanging fixture 2 includes a ball joint seat tube 203, which is a central through structure. A thin neck 208 is provided at one end of the central through structure. A ball joint portion 202 is provided at one end of the cone sleeve 201. The ball joint portion 202 is arranged in the ball joint seat tube 203, and one end of the ball joint portion 202 is abutted against the thin neck 208. A connecting piece 204 is also provided, and one end of the connecting piece 204 is threadedly connected to the central through structure of the ball joint seat tube 203 and abuts against the ball joint portion 202.

[0034] The ball joint structure formed by the ball joint seat tube 203, the connecting piece 204 and the ball joint part 202 allows the core rod 7 to swing freely.

[0035] In the preferred scheme, a guide rail device 101 and a screw device 102 are provided on one side of the tower device 1, and a first sliding platform 206 is also provided. The first sliding platform 206 is slidably connected to the guide rail device 101 through a slider, and a nut seat is provided on the side of the first sliding platform 206 close to the tower device 1, and the nut seat is sleeved with the screw device 102, and a synchronous belt assembly 601 is also provided. A rotary drive motor 6 is also provided on the tower device 1, and the shaft end of the rotary drive motor 6 and the screw device 102 are transmitted through the synchronous belt assembly 601. The upper end of the connecting member 204 is connected to a first L-shaped connecting plate 205, and the first L-shaped connecting plate 205 is connected to the first sliding platform 206.

[0036] The first L-shaped connecting plate 205 is provided with a waist-shaped hole 207 , and the upper end of the connecting member 204 is connected to the first L-shaped connecting plate 205 through a bolt and a nut, and the position of the bolt in the waist-shaped hole 207 is adjustable.

[0037] The rotary drive motor 6 drives the lead screw device 102 to rotate, so that the first sliding platform 206 drives the core rod hanging fixture 2 to move up and down.

[0038] In the preferred embodiment, a connecting cone cylinder 302 is provided at one end of the clamp cylinder 3, and a plurality of pin holes 303 are circumferentially provided on the cone sleeve 201 and the connecting cone cylinder 302. The cone sleeve 201 is provided with an inner cone groove, and the connecting cone cylinder 302 is sleeved with the inner cone groove. A pin shaft 304 is also provided, and one end of the pin shaft 304 is inserted into the pin hole 303 and pins the connecting cone cylinder 302 and the cone sleeve 201.

[0039] The connecting cone cylinder 302 and the cone sleeve 201 can be quickly assembled and disassembled, and the clamp cylinder 3 of corresponding specifications can be quickly replaced according to the diameter of the core rod 7.

[0040] A pin hole 303 may be provided every ninety degrees to facilitate quick adjustment of the circumferential angle of the clamp cylinder 3 .

[0041] One end of the pin shaft 304 is a large diameter end, and the small diameter end passes through the pin hole 303. A detachable limit pin 305 is provided at the end to prevent the pin shaft 304 from falling.

[0042] In the preferred embodiment, the sleeve clamping platform 5 also includes a second sliding table 502, which is slidably connected to the guide rail device 101, and a second L-shaped connecting plate 501 is provided on the second sliding table 502. A first fine-tuning device is connected between the second L-shaped connecting plate 501 and the first translation table 503, and a second fine-tuning device is connected between the first translation table 503 and the second translation table 504. The first fine-tuning device and the second fine-tuning device include a first screw sleeve 506 and a second screw sleeve 507, and the adjustment screw 508 is threadedly connected to the first screw sleeve 506 and the second screw sleeve 507 respectively, and the first fine-tuning device and the second fine-tuning device are arranged vertically.

[0043] The second L-shaped connecting plate 501 is connected to the second screw sleeve 507 of the first fine-tuning device, the first translation platform 503 is connected to the first screw sleeve 506 of the first fine-tuning device, the second screw sleeve 507 of the second fine-tuning device is connected to the first translation platform 503, and the second translation platform 504 is connected to the first screw sleeve 506 of the second fine-tuning device, and the lateral positions of the two platforms are accurately adjusted by using a screw pair.

[0044] In the preferred embodiment, one end of the second L-shaped connecting plate 501 is connected to a positioning sleeve 509, which is slidably connected to the guide rail device 101. A tightening knob 510 is also provided which is threadedly connected to the positioning sleeve 509, and one end of the tightening knob 510 passes through the positioning sleeve 509 to rest against the guide rail device 101.

[0045] The height position of the casing clamping platform 5 can be adjusted manually. After the adjustment is completed, the tightening knob 510 is tightened to lock the height position of the casing clamping platform 5.

[0046] In the preferred embodiment, a detachable spherical clamp support seat is provided on the sleeve clamping platform 5, and a detachable spherical clamp is provided on the detachable spherical clamp support seat. The detachable spherical clamp support seat includes a first half sleeve 511 and a second half sleeve 512 hinged at one end. The first half sleeve 511 and the second half sleeve 512 are provided with matching hemispherical arc grooves 513. A swingable rocker 514 is provided at one end of the first half sleeve 511 away from the hinged end of the second half sleeve 512. The second half sleeve 512 is provided with a slot seat 515. The rocker 514 is inserted into the slot seat 515. A threaded nut 516 is provided on the rocker 514. The end of the nut 516 abuts against the slot seat 515. The detachable spherical clamp includes two matching hemispherical sleeves 517. The hemispherical sleeves 517 are provided with a semi-arc column groove 518.

[0047] The outer side of the removable spherical clamp is spherical and can be fitted into the hemispherical arc groove 513 of the removable spherical clamp support seat. Since the upper end of the sleeve 8 is clamped and the sleeve 8 is relatively long, the center of gravity of the sleeve 8 is biased downward and the sleeve 8 is kept vertical by its own weight. When the sleeve 8 and the mandrel 7 are aligned, the swing direction of the sleeve 8 can be adjusted in real time to make it parallel to the mandrel 7, and then the orthogonal platform translation can be coordinated to ensure that the mandrel 7 and the sleeve 8 are smoothly docked.

[0048] In the preferred embodiment, a chuck mounting conical hole 301 is provided at the lower end of the clamp tube 3, a hollow basic chuck 401 is provided in the chuck mounting conical hole 301, a plurality of grooves are provided on the side wall of the basic chuck 401 along the circumferential direction, the basic chuck 401 is provided with a rear conical surface 407 which fits with the chuck mounting conical hole 301, the basic chuck 401 is also provided with a front conical surface 408, the end of the driving shaft of the clamp tube 3 is sleeved with a threaded locking cap 402, a conical surface supporting portion 409 is provided in the locking cap 402, and the conical surface supporting portion 409 rests against the front conical surface 408.

[0049] The side wall of the basic chuck 401 is circumferentially grooved to form a plurality of clamping petals. The locking cap 402 is rotated so that the front conical surface 408 squeezes the conical surface top support portion 409, and the basic chuck 401 moves toward the bottom end of the chuck mounting conical hole 301. The inner wall of the chuck mounting conical hole 301 squeezes the rear conical surface 407, and the clamping petals of the basic chuck 401 shrink inward to clamp the side wall of the sleeve clamping platform 5.

[0050] In a preferred solution, a spacer sleeve 403 with a reducible diameter is provided in the basic chuck 401 . The spacer sleeve 403 includes a first half sleeve 404 and a second half sleeve 405 . An avoidance notch 406 is provided between the first half sleeve 404 and the second half sleeve 405 .

[0051] The basic clamp 401 is made of steel, and the spacer 403 is made of softer materials such as copper or aluminum to prevent the basic clamp 401 from directly contacting the surface of the preform rod and causing grinding or cracks.

[0052] The avoidance notch 406 is a broken line structure so that a staggered insertion groove and a protrusion are formed at the junction of the first half sleeve 404 and the second half sleeve 405 to ensure the closing margin of the first half sleeve 404 and the second half sleeve 405.

[0053] Embodiment 2:

[0054] The device adopts a tower structure, which is divided into upper and lower parts (upper tower assembly and lower tower assembly), which are connected into a whole by bolts. The main body of the tower frame is welded with square tubes 40×40×4, with a total height of 4.2m.

[0055] The linear guide rail assembly is installed on both sides of the tower, and the ball screw motion assembly is installed on the upper tower assembly; the core rod suspension fixture is installed on the upper tower assembly to clamp the quartz core rod (diameter ø10~ø16); the sleeve clamping platform is installed on the lower tower assembly to clamp the quartz sleeve.

[0056] The core rod clamping mechanism can be quickly clamped by the collet; the collet is suspended on the mounting back plate by a spherical hanger, and the spherical hanger is adjusted adaptively by gravity to make the core rod vertically downward; the spherical hanger can move forward and backward through the waist-shaped hole to adjust the position of the core rod in the front and rear directions.

[0057] The quartz sleeve is clamped by a spherical clamp, and the sleeve is adaptively adjusted to be vertically downward; by adjusting the manual platform, the position of the sleeve in the XY direction can be adjusted to adapt to the center alignment of the core rod and the sleeve.

[0058] The servo motor drives the synchronous wheel to rotate, drives the screw to rotate, and drives the ball (screw) nut to move up and down, so as to achieve the purpose of the mandrel moving up and down. The purpose of automatic RIT for preform preparation can be achieved by remotely controlling the motor through the program / handle.

[0059] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limitations of the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. An optical fiber preform rod sleeve device based on RIT, characterized by: The invention comprises a tower device (1), wherein a core rod hanging fixture (2) and a casing clamping platform (5) are provided on the tower device (1), wherein the relative distance between the core rod hanging fixture (2) and the casing clamping platform (5) is adjustable, the core rod hanging fixture (2) is arranged above the casing clamping platform (5), the core rod hanging fixture (2) comprises a swingable cone sleeve (201), a locking rod structure (4) is arranged at the lower end of the cone sleeve (201), the locking rod structure (4) is used to clamp the upper end of the core rod (7), and the casing clamping platform (5) comprises a first translation platform (503) that can be moved horizontally, a second translation platform (504) that can be moved horizontally is arranged on the first translation platform (503), the moving directions of the first translation platform (503) and the second translation platform (504) are perpendicular, and a casing clamping device (505) is arranged on the second translation platform (504), and the casing clamping device (505) is used to connect the casing (8).

2. The optical fiber preform sleeve connection device based on RIT according to claim 1, characterized in that: The core rod hanging fixture (2) comprises a ball joint seat tube (203), the ball joint seat tube (203) being a central through structure, one end of which is provided with a thin neck (208), one end of the cone sleeve (201) being provided with a ball joint portion (202), the ball joint portion (202) being arranged in the ball joint seat tube (203), one end of which is abutted against the thin neck (208), and a connecting piece (204) being further provided, one end of which is threadedly connected to the central through structure of the ball joint seat tube (203) and abutted against the ball joint portion (202).

3. The optical fiber preform sleeve connection device based on RIT according to claim 2, characterized in that: A guide rail device (101) and a lead screw device (102) are provided on one side of the tower device (1), and a first sliding platform (206) is also provided. The first sliding platform (206) is slidably connected to the guide rail device (101) via a slider. A nut seat is provided on the side of the first sliding platform (206) close to the tower device (1), and the nut seat is sleeved with the lead screw device (102). A synchronous belt assembly (601) is also provided. A rotary drive motor (6) is also provided on the tower device (1). The shaft end of the rotary drive motor (6) and the lead screw device (102) are driven via the synchronous belt assembly (601). The upper end of the connector (204) is connected to a first L-shaped connecting plate (205), and the first L-shaped connecting plate (205) is connected to the first sliding platform (206).

4. The optical fiber preform sleeve connection device based on RIT according to claim 1, characterized in that: A connecting cone (302) is provided at one end of the clamp cylinder (3); a plurality of pin holes (303) are provided along the circumferential direction of the cone sleeve (201) and the connecting cone cylinder (302); the cone sleeve (201) is provided with an inner cone groove; the connecting cone cylinder (302) is sleeved with the inner cone groove; and a pin shaft (304) is further provided; one end of the pin shaft (304) is inserted into the pin hole (303) and pins the connecting cone cylinder (302) and the cone sleeve (201).

5. The optical fiber preform sleeve connection device based on RIT according to claim 1, characterized in that: The casing clamping platform (5) further comprises a second sliding platform (502), the second sliding platform (502) being slidably connected to the guide rail device (101), a second L-shaped connecting plate (501) being provided on the second sliding platform (502), a first fine-adjusting device being connected between the second L-shaped connecting plate (501) and the first translation platform (503), a second fine-adjusting device being connected between the first translation platform (503) and the second translation platform (504), the first fine-adjusting device and the second fine-adjusting device comprising a first screw sleeve (506) and a second screw sleeve (507), an adjusting screw rod (508) being threadedly connected to the first screw sleeve (506) and the second screw sleeve (507), respectively, and the first fine-adjusting device and the second fine-adjusting device being arranged vertically.

6. The optical fiber preform sleeve connection device based on RIT according to claim 5, characterized in that: One end of the second L-shaped connecting plate (501) is connected to a positioning sleeve (509), the positioning sleeve (509) is slidably sleeved with the guide rail device (101), and a tightening knob (510) is threadedly connected to the positioning sleeve (509), one end of the tightening knob (510) passes through the positioning sleeve (509) to abut against the guide rail device (101).

7. The optical fiber preform sleeve connection device based on RIT according to claim 1, characterized in that: A detachable spherical clamp support seat is provided on the casing clamping platform (5), and a detachable spherical clamp is provided on the detachable spherical clamp support seat. The detachable spherical clamp support seat comprises a first half sleeve (511) and a second half sleeve (512) hinged at one end. The first half sleeve (511) and the second half sleeve (512) are provided with matching hemispherical arc grooves (513). The first half sleeve (511) is away from the second half sleeve (512) hinged at one end. A swingable swing rod (514) is provided at one end, a second half sleeve (512) is provided with a slot seat (515), the swing rod (514) is inserted into the slot seat (515), a screw threaded nut (516) is provided on the swing rod (514), an end of the screw nut (516) abuts against the slot seat (515), and the detachable spherical fixture comprises two matching hemispherical sleeves (517), and the hemispherical sleeves (517) are provided with a semi-arc column groove (518).

8. The optical fiber preform sleeve connection device based on RIT according to claim 1, characterized in that: A chuck mounting conical hole (301) is provided at the lower end of the clamp barrel (3), a hollow basic chuck (401) is provided in the chuck mounting conical hole (301), a plurality of grooves are provided on the side wall of the basic chuck (401) along the circumferential direction, the basic chuck (401) is provided with a rear conical surface (407) that fits the chuck mounting conical hole (301), the basic chuck (401) is also provided with a front conical surface (408), a locking cap (402) that is threadedly connected is sleeved on the end of the driving shaft of the clamp barrel (3), a conical surface abutting portion (409) is provided in the locking cap (402), and the conical surface abutting portion (409) abuts against the front conical surface (408).

9. The optical fiber preform sleeve connection device based on RIT according to claim 8, characterized in that: A spacer sleeve (403) with a reducible diameter is provided inside the basic clamp (401); the spacer sleeve (403) comprises a first half sleeve (404) and a second half sleeve (405); an avoidance notch (406) is provided between the first half sleeve (404) and the second half sleeve (405).

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