Device for improving loose body deposition in optical fiber preform production

Abstract

The utility model relates to the technical field of optical fiber production, in particular to an improvement device for loose body deposition in optical fiber preform production, and aims to overcome the defect of large laser intensity change fluctuation in the prior art. According to the technical scheme, the improvement device for loose body deposition in optical fiber preform production comprises a tower, a deposition cavity and a target rod, a loose body is fixed to the lower portion of the target rod, the improvement device further comprises a detection part and a driving part, and the detection part comprises a laser emitting part, a laser receiving part and a control console; the driving part comprises a lifting motor and a rotating motor, the laser emitting part and the laser receiving part are improved, the laser diameter needed by the loose body is determined according to the actual situation, the influence of shaking of the loose body on the shielded laser diameter is reduced, the balance of lifting speed change is ensured, and the fluctuation of lifting speed change is reduced. And adjustment operation can be carried out according to different loose body conditions.

Description

Technical Field

[0001] The utility model relates to the technical field of optical fiber production, in particular to a device for improving the deposition of loose bodies in the production of optical fiber preform rods. Background Art

[0002] The mainstream method for producing the core rod of optical fiber preform includes axial vapor deposition (VAD). The axial vapor deposition (VAD) is carried out in a closed cavity, and the target rod is fixed on the traction rod, and the other end of the traction rod is fixed on the rotating chuck, which rotates at a constant speed. The core layer torch and multiple cladding torches continuously spray and ignite the mixed gas, and then a hydrolysis reaction occurs to produce accumulated powder. The powder is rotated and raised with the continuous rotation of the target rod and finally forms an accumulated loose body.

[0003] In order to ensure the stable production of loose bodies and the uniformity of the optical properties and diameter of the core rod of the optical fiber preform, it is necessary to control the lifting speed of the target rod. Therefore, a laser transmitter and a laser receiver are provided under the loose body. When the loose body is accumulated, the laser is blocked. When the equipment detects that the laser intensity is weakened, the lifting speed is accelerated, and vice versa, the lifting speed is reduced, thereby controlling the fluctuation of the lifting speed within a stable range, and finally controlling the diameter and optical properties of the loose body to be stable.

[0004] In the prior art, the diameter of the laser beam emitted by the laser transmitter is only 0.68 mm. The small diameter of the beam and the slight shaking of the loose body will cause dislocation, which cannot completely block the laser beam, which will reduce the lifting speed. When the shaking blocks the laser beam, the lifting speed will be accelerated, which will lead to frequent changes in the lifting speed, which is very likely to affect the uniformity of the core rod of the optical fiber preform. In order to reduce the impact of the shaking of the loose body, a laser transmitter and laser receiver with a large beam diameter can be used, but the overall cost is high. Utility Model Content

[0005] Therefore, the technical problem to be solved by the utility model is to overcome the defect of large fluctuation of laser intensity in the prior art, thereby providing an improved device for loose body deposition in the production of optical fiber preform.

[0006] The above technical objectives of the utility model are achieved through the following technical solutions:

[0007] A device for improving the deposition of loose bodies in the production of optical fiber preforms, comprising a tower, a deposition cavity and a target rod, wherein the deposition cavity is fixed in the tower, the target rod is arranged below the middle of the tower top and is arranged to slide vertically in the center of the top of the deposition cavity, the target rod is also arranged to rotate relative to the deposition cavity, a loose body is fixed below the target rod, and the device also comprises a detection member and a driving member, the detection member comprises a laser emitting component and a laser receiving component arranged relatively, the laser emitting component and the laser receiving component are both mounted on the tower, the detection member also comprises a control console, the laser receiving component is connected to the control console signal control, the control console is also connected to the driving member signal control, the driving member comprises a lifting motor and a rotating motor, the lifting motor is arranged on the tower to control the target rod to slide vertically in the deposition cavity, the rotating motor is also arranged on the tower and controls the target rod to rotate along the vertical axis.

[0008] By adopting the above-mentioned technical scheme, the laser emitting component and the laser receiving component are improved, the laser diameter required at the loose body is determined according to the actual situation, and the influence of the loose body shaking on the blocking of the laser diameter is reduced to ensure the balance of the lifting speed change and reduce the volatility of the lifting speed change. The present application has a simple structure and low cost, and can be adjusted according to different loose body conditions.

[0009] Furthermore, the laser emitting component includes a fixing frame, a laser emitter and a diverging part, the laser emitter and the diverging part are arranged in parallel on the fixing frame, the diverging part is arranged at one end of the laser emitter close to the target rod, the fixing frame is arranged on the tower frame and along the width of the tower frame, and the fixing frame is arranged near the middle of the deposition chamber.

[0010] By adopting the above technical solution, the laser generated by the laser transmitter is diverged through the diverging member to expand the laser diameter without changing the original laser path, which is convenient for aligning the bottom of the loose body and improving the laser intensity fluctuation range.

[0011] Furthermore, the divergent part includes a concave lens, a holder and two fixing rings. The holder is arc-shaped and has a slot in the middle. The concave lens is clamped in the slot. The fixing rings are relatively arranged at both ends of the holder and the axis coincides with the holder. The fixing rings are respectively threadedly connected to the two ends of the axis of the holder.

[0012] By adopting the above technical solution, the concave lens is inserted into the holder and fixed by two fixing rings, so as to ensure that the concave lens is aligned with the laser emitter and the laser path during use, thereby reducing the impact of the shaking of the concave lens during use.

[0013] Furthermore, a movable block is provided under the base, and the movable block is slidably arranged on the fixed frame and the sliding direction is along the length direction of the tower. A sliding rod and two guide rods are provided in the fixed frame corresponding to the movable block, and the sliding rod and the guide rod are both arranged along the length direction of the fixed frame and the axes are parallel. The guide rods are symmetrically arranged on both sides of the sliding rod, the sliding rod is threadedly connected to the movable block and is positioned and rotatably installed on the fixed frame, and the guide rod passes through the movable block and both ends are fixed to the fixed frame.

[0014] By adopting the above technical solution, the movable block drives the holder to slide relative to the fixed frame, controls the distance between the concave lens and the laser emitter, adjusts the position of the concave lens to ensure that the focal length of the laser emitter and the concave lens are equal, ensures that the laser is completely diffused, and realizes the divergence function.

[0015] Furthermore, the laser receiving component includes a laser receiver, a focusing piece and an adjustment seat, the laser receiver and the adjustment seat are arranged in parallel on the tower, the focusing piece is arranged on the adjustment seat and is located at one end of the laser receiver close to the target rod, the adjustment seat is movably connected to the tower, the focusing piece includes a convex lens, two adjustment frames and an adjustment control, the adjustment frames are relatively slidably arranged on the adjustment seat, the convex lens is clamped between the two adjustment frames, and each of the adjustment frames is connected to a corresponding adjustment control at the bottom.

[0016] By adopting the above technical solution, the laser receiver is set at the focus of the focusing member to ensure that all divergent lasers can be received, and the laser transmitter and laser receiver are in the same straight line to ensure that the laser path will not be changed; the adjustment frame can adjust the position of the convex lens left and right relative to the clamped convex lens to align with the laser receiver.

[0017] Furthermore, an arc-shaped engaging groove is provided in the middle of the adjustment frame, and the curvature of the engaging groove is in line with the curvature of the outer side of the convex lens. The adjustment control includes a bottom adjusting block, an adjusting screw and a connecting block. The connecting block is fixed on the side of the adjustment frame away from each other. A bottom adjusting block is fixed at the bottom of the connecting block. The bottom adjusting block is threadedly connected to the adjusting screw. The axis of the adjusting screw is arranged along the length direction of the adjustment seat. A locking piece is also provided on the top of the adjustment frame. The locking piece includes two locking clips, a locking rod and two locking bolts. The locking clips are respectively vertically fixed on the top of the adjustment frame. The locking rod passes through the two locking clips and is fixed at both ends by locking bolts.

[0018] By adopting the above technical solution, the engaging groove cooperates with the outer side of the convex lens to engage and clamp the convex lens, and the adjusting screw rotates to control the bottom adjusting block to drive the connecting block to move, thereby adjusting the position between the axis of the convex lens and the center of the laser receiver.

[0019] Furthermore, the adjustment seat is relatively slidably arranged on the tower, the sliding direction of the adjustment seat is parallel to the length direction of the tower, the tower is extended with an adjustment frame corresponding to the adjustment seat, and the adjustment frame is provided with an adjustment rod and two guide rods corresponding to the adjustment seat, the adjustment rod and the guide rod are both arranged along the length direction of the adjustment frame and the axes are parallel, the guide rods are symmetrically arranged on both sides of the adjustment rod, the adjustment rod is threadedly connected to the adjustment seat and both ends are positioned and rotatably installed on the adjustment frame, the guide rod passes through the adjustment seat and both ends are fixed on the adjustment frame.

[0020] By adopting the above technical solution, the position of the adjustment seat from the laser receiver is controlled to ensure that all lasers can be received, thereby achieving adjustment of the longitudinal distance.

[0021] Furthermore, the adjustment seat is a lifting structure, and the adjustment seat includes two adjustment rods, two limit rods, an upper adjustment block and a lower adjustment block. The two adjustment rods are arranged at the diagonal of the upper adjustment block, and the two limit rods are arranged at the other diagonal of the upper adjustment block. The upper adjustment block has outer adjustment blocks extending near the four corners. The adjustment rod is positioned and rotatably installed on the lower adjustment block and is threadedly connected to the outer adjustment block. The bottom of the limit rod is fixed on the lower adjustment block and passes through the outer adjustment block.

[0022] By adopting the above technical solution, the lifting adjustment seat ensures the accuracy between the convex lens and the center position of the laser receiver, thereby achieving adjustment of the upper and lower positions.

[0023] In summary, the technical solution of the utility model has the following advantages:

[0024] 1. The utility model provides an improved device for the deposition of loose bodies in the production of optical fiber preforms, improves the laser emitting components and the laser receiving components, determines and expands the laser diameter required at the loose body according to actual conditions, reduces the influence of the loose body shaking on the blocking of the laser diameter, ensures the balance of the lifting speed change, and reduces the volatility of the lifting speed change.

[0025] 2. The device for improving the deposition of loose bodies in the production of optical fiber preforms provided by the present invention has a simple structure, low cost, and can be adjusted according to different loose body conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1It is a schematic diagram of the overall structure of a device for improving the deposition of loose bodies in the production of optical fiber preforms provided in one embodiment of the utility model;

[0028] Figure 2 A schematic diagram of the internal structure of a device for improving the deposition of loose bodies in the production of optical fiber preforms provided in one embodiment of the utility model;

[0029] Figure 3 A schematic diagram of a partial structure of a laser emitting component provided in one embodiment of the utility model;

[0030] Figure 4 It is a schematic diagram of the local structure of a laser receiving component provided in one embodiment of the utility model.

[0031] Description of reference numerals:

[0032] 1. Tower; 11. Adjustment frame; 111. Adjustment rod; 112. Guide rod; 2. Deposition chamber; 3. Target rod; 31. Loose body; 4. Detection component; 5. Laser emitting component; 51. Fixing frame; 52. Laser emitter; 53. Divergence component; 531. Concave lens; 532. Card seat; 5321. Card slot; 5322. Movable block; 53221. Sliding rod; 53222. Guide rod; 533. Fixing ring; 6. Laser receiving component; 61. Laser receiver; 62. Aggregation component; 62 1. Convex lens; 622. Adjustment frame; 6221. Engagement groove; 623. Adjustment control; 6231. Bottom adjustment block; 6232. Adjustment screw; 6233. Connecting block; 63. Adjustment seat; 631. Adjustment rod; 632. Limit rod; 633. Upper adjustment block; 6331. Outer adjustment block; 634. Lower adjustment block; 64. Locking piece; 641. Locking card; 642. Locking rod; 643. Locking bolt; 7. Control console; 8. Driving piece; 81. Lifting motor; 82. Rotating motor. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] A device for improving the deposition of loose bodies in the production of optical fiber preforms, such as Figure 1 and Figure 2As shown, it includes a tower 1, a deposition chamber 2 and a target rod 3, the deposition chamber 2 is fixed in the tower 1, the target rod 3 is arranged at the lower middle of the top of the tower 1 and is vertically slidably arranged at the top center of the deposition chamber 2, the target rod 3 is also rotatably arranged relative to the deposition chamber 2, a loose body 31 is fixed below the target rod 3, and also includes a detection member 4 and a driving member 8, the detection member 4 includes a laser emitting component 5 and a laser receiving component 6 arranged oppositely, the laser emitting component 5 and the laser receiving component 6 are installed on the tower 1, the laser emitting component 5 is arranged at the rear side of the tower 1, and the laser The light receiving component 6 is installed on the front side of the tower 1. The deposition chamber 2 is provided with a lens corresponding to the laser emitting component 5 and the laser receiving component 6 to facilitate the passage of light. The detection component 4 also includes a control console 7. The laser receiving component 6 is connected to the control console 7 by signal control. The control console 7 is also connected to the driving component 8 by signal control. The driving component 8 includes a lifting motor 81 and a rotating motor 82. The lifting motor 81 is arranged on the tower 1 to control the vertical sliding of the target rod 3 in the deposition chamber 2. The rotating motor 82 is also arranged on the tower 1 and controls the target rod 3 to rotate along the vertical axis. The present application improves the laser emitting component 5 and the laser receiving component 6, determines the required laser diameter at the loose body 31 according to the actual situation, reduces the influence of the shaking of the loose body 31 on the blocking of the laser diameter, ensures the balance of the lifting speed change, and reduces the volatility of the lifting speed change. The present application has a simple structure and low cost, and can be adjusted according to the conditions of different loose bodies 31.

[0035] like Figure 2 and Figure 3 As shown, the laser emitting component 5 includes a fixing frame 51, a laser emitter 52 and a diverging member 53. The laser emitter 52 and the diverging member 53 are arranged in parallel on the fixing frame 51. The diverging member 53 is arranged at one end of the laser emitter 52 close to the target rod 3. The fixing frame 51 is arranged on the tower 1 and along the width of the tower 1. The fixing frame 51 is arranged near the middle of the deposition chamber 2. The laser generated by the laser emitter 52 is diverged through the diverging member 53 to expand the laser diameter without changing the original laser path, so as to facilitate alignment with the bottom of the loose body 31 and improve the laser intensity fluctuation range.

[0036] The diverging member 53 includes a concave lens 531, a holder 532 and two fixing rings 533. The holder 532 is arc-shaped and has a slot 5321 in the middle. The concave lens 531 is snap-fitted in the slot 5321. The fixing rings 533 are relatively arranged at the front and rear ends of the axis of the holder 532 and the axis coincides with the holder 532. The fixing rings 533 are respectively threadedly connected to the two ends of the holder 532. The concave lens 531 is snapped into the holder 532 and fixed by the two fixing rings 533 to ensure that the concave lens 531 is aligned with the laser emitter 52 and the laser path during use, thereby reducing the impact of the shaking of the concave lens 531 during use.

[0037] The diverging member 53 includes a concave lens 531, a holder 532 and two fixing rings 533. The holder 532 is arc-shaped and has a slot 5321 in the middle. The concave lens 531 is snap-fitted in the slot 5321. The fixing rings 533 are relatively arranged at both ends of the holder 532 and the axis coincides with the holder 532. The fixing rings 533 are respectively threadedly connected to both ends of the holder 532. The movable block 5322 drives the holder 532 to slide relative to the fixed frame 51, controls the distance between the concave lens 531 and the laser emitter 52, adjusts the position of the concave lens 531 to ensure that the focal length of the laser emitter 52 is equal to that of the concave lens 531, ensures that the laser is completely diffused, and realizes the diverging function.

[0038] like Figure 2 and Figure 4 As shown, the laser receiving component 6 includes a laser receiver 61, a focusing member 62 and an adjustment seat 63. The laser receiver 61 and the adjustment seat 63 are arranged in parallel on the tower 1. The focusing member 62 is arranged on the adjustment seat 63 and is located at one end of the laser receiver 61 close to the target rod 3. The adjustment seat 63 is movably connected to the tower 1. The laser receiver 61 is arranged at the focus of the focusing member 62 to ensure that all divergent lasers can be received, and the laser transmitter 52 and the laser receiver 61 are in the same straight line to ensure that the laser path will not be changed.

[0039] The gathering member 62 includes a convex lens 621, two adjustment frames 622 and an adjustment control 623. The adjustment frames 622 are relatively slidably arranged on the adjustment seat 63. The convex lens 621 is clamped between the two adjustment frames 622. The bottom of each adjustment frame 622 is connected to a corresponding adjustment control 623. The adjustment frame 622 clamps the convex lens 621 relative to the left and right positions of the convex lens 621 to align with the laser receiver 61. An arc-shaped engaging groove 6221 is arranged in the middle of the adjustment frame 622. The arc of the engaging groove 6221 fits the arc of the outer side of the convex lens 621. The adjustment control 623 includes a bottom adjustment block 6231, an adjustment screw 6232 and a connecting block 6233. The connecting block 6233 is fixed on the side of the adjustment frame 622 that is away from each other. The bottom of the connecting block 6233 is fixed with a bottom adjustment block 6231. The bottom adjustment block 6231 is threadedly connected to the adjusting screw 6232. The axis of the adjusting screw 6232 is arranged along the length direction of the adjustment seat 63.

[0040] A locking member 64 is also provided on the top of the adjustment frame 622. The locking member 64 includes two locking clips 641, a locking rod 642 and two locking bolts 643. The locking clips 641 are respectively fixed vertically on the top of the adjustment frame 622. The locking rod 642 passes through the two locking clips 641 and is fixed at both ends by locking bolts 643. The engaging groove 6221 engages with the outer side of the convex lens 621 to clamp the convex lens 621. The adjusting screw 6232 rotates to control the bottom adjusting block 6231 to drive the connecting block 6233 to move, thereby adjusting the position between the axis of the convex lens 621 and the center of the laser receiver 61.

[0041] The adjustment seat 63 is also relatively slidably arranged on the tower 1, and the sliding direction of the adjustment seat 63 is parallel to the length direction of the tower 1. The tower 1 is extended with an adjustment frame 11 corresponding to the adjustment seat 63. The adjustment frame 11 is provided with an adjustment rod 111 and two guide rods 112 corresponding to the adjustment seat 63. The adjustment rod 111 and the guide rod 112 are both arranged along the length direction of the adjustment frame 11 and the axes are parallel. The guide rods 112 are symmetrically arranged on both sides of the adjustment rod 111. The adjustment rod 111 is threadedly connected with the adjustment seat 63 and both ends are positioned and rotatably installed on the adjustment frame 11. The guide rods 112 pass through the adjustment seat 63 and the front and rear ends are fixed on the adjustment frame 11. The position of the adjustment seat 63 from the laser receiver 61 is controlled to ensure that all lasers can be received, so as to achieve the adjustment of the longitudinal distance.

[0042] The adjustment seat 63 is a lifting structure, and the adjustment seat 63 includes two adjustment rods 631, two limit rods 632, an upper adjustment block 633 and a lower adjustment block 634. The two adjustment rods 631 are arranged at the diagonal of the upper adjustment block 633, and the adjustment rods 631 are arranged at the right front side and the left rear side of the upper adjustment block 633. The two limit rods 632 are arranged at the other diagonal of the upper adjustment block 633, and the limit rods 632 are arranged at the left front side and the right rear side of the upper adjustment block 633. The upper adjustment block 633 is extended with an outer adjustment block 6331 near the four corners. The adjustment rod 631 is fixed and rotatably installed on the lower adjustment block 634 and is threadedly connected with the outer adjustment block 6331. The bottom of the limit rod 632 is fixed on the lower adjustment block 634 and passes through the outer adjustment block 6331. The lifting adjustment seat 63 ensures that the convex lens 621 and the center position of the laser receiver 61 are accurate, and the upper and lower positions are adjusted.

[0043] like Figure 2 , Figure 3 and Figure 4As shown, the present application improves the laser according to the principle that the concave lens 531 diverges the light and the convex lens 621 gathers the light. A concave lens 531 is installed at the end of the laser transmitter 52, and a convex lens 621 is installed in front of the laser receiver 61. The positions of the concave lens 531 and the convex lens 621 are adjusted so that the original laser path does not change. The selection parameters of the concave lens 531 are: lens diameter 10cm, focal length -10cm; the selection parameters of the convex lens 621 are: lens diameter 10cm, focal length 10cm. The position of the concave lens 531 is adjusted so that the laser can pass through the center of the concave lens 531. The distance between the laser transmitter 52 and the center of the concave lens 531 is consistent with the focal length of the concave lens 531, and the laser receiver 61 is located at the focus of the convex lens 621. The magnification formula of the concave lens 531 is m = |f| / (u+|f|), where m is the magnification, u is the object distance, and f is the focal length. The laser diameter D at the loose body 31 is D / m, where d is the laser diameter of the laser emitter 52. After actual measurement, u≈38cm, and the laser diameter at the loose body 31 is actually magnified by about 5 times, while the theoretical calculation result is 4.8 times, and the actual result is close to the theoretical result. When the laser reaches the laser receiver 61 after being amplified, the light diameter is magnified by 8.8 times, that is, the actual light diameter is 6mm, the light cross-sectional area is 28.3mm2, and the area of ​​the laser receiver 61 is 16mm2. In order to ensure that the laser light is fully received, a convex lens 621 is added. After using this device, the fluctuation range of the laser intensity and the fluctuation range of the lifting speed are reduced by about 50%.

[0044] The working principle and use method of the device for improving the deposition of the loose body 31 in the production of the optical fiber preform are as follows: before use, the required laser diameter is determined according to the actual situation of the loose body 31, the distance from the laser transmitter 52 to the target rod 3 is pre-adjusted, the focal length and lens size of the concave lens 531 and the convex lens 621 are selected according to calculation, and then the position of the concave lens 531 and the position of the convex lens 621 are adjusted, the laser receiver 61 is at the focus of the convex lens 621 and ensures that the laser path remains unchanged, and then the deposition operation of the loose body 31 is started, and the lifting speed is adjusted according to the change of the laser intensity.

[0045] The above description shows and describes the preferred embodiments of the utility model. As mentioned above, it should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the utility model concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not depart from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. An improved device for the deposition of loose bodies in the production of optical fiber preforms, comprising a tower (1), a deposition chamber (2) and a target rod (3), wherein the deposition chamber (2) is fixed in the tower (1), the target rod (3) is arranged at the lower middle of the top of the tower (1) and is vertically slidably arranged at the top center of the deposition chamber (2), the target rod (3) is also rotatably arranged relative to the deposition chamber (2), a loose body (31) is fixed below the target rod (3), and the characteristics are as follows: The device also comprises a detection member (4) and a driving member (8). The detection member (4) comprises a laser emitting member (5) and a laser receiving member (6) which are arranged opposite to each other. The laser emitting member (5) and the laser receiving member (6) are both mounted on the tower (1). The detection member (4) also comprises a control console (7). The laser receiving member (6) is connected to the control console (7) by signal control. The control console (7) is also connected to the driving member (8) by signal control. The driving member (8) comprises a lifting motor (81) and a rotating motor (82). The lifting motor (81) is arranged on the tower (1) to control the vertical sliding of the target rod (3) in the deposition chamber (2). The rotating motor (82) is also arranged on the tower (1) to control the rotation of the target rod (3) along the vertical axis.

2. The device for improving the deposition of loose bodies in the production of optical fiber preform according to claim 1, characterized in that: The laser emitting component (5) comprises a fixing frame (51), a laser emitter (52) and a diverging piece (53); the laser emitter (52) and the diverging piece (53) are arranged in parallel on the fixing frame (51); the diverging piece (53) is arranged at one end of the laser emitter (52) close to the target rod (3); and the fixing frame (51) is arranged on the tower (1) and along the width of the tower (1).

3. The device for improving the deposition of loose bodies in the production of optical fiber preform according to claim 2, characterized in that: The diverging member (53) comprises a concave lens (531), a holder (532) and two fixing rings (533); the holder (532) is arc-shaped and has a fixing groove (5321) in the middle; the concave lens (531) is fixedly arranged in the fixing groove (5321); the fixing ring (533) is relatively arranged at two ends of the holder (532) and its axis is arranged to coincide with the holder (532); the fixing ring (533) is respectively threadedly connected to two ends of the axis of the holder (532).

4. The device for improving the deposition of loose bodies in the production of optical fiber preform according to claim 3, characterized in that: A movable block (5322) is also provided below the clamping seat (532). The movable block (5322) is slidably provided on the fixed frame (51) and its sliding direction is along the length direction of the tower frame (1). A sliding rod (53221) and two guide rods (53222) are provided in the fixed frame (51) corresponding to the movable block (5322). The sliding rod (53221) and the guide rod (53222) are both provided along the length direction of the fixed frame (51) and their axes are parallel. The guide rods (53222) are symmetrically provided on both sides of the sliding rod (53221). The sliding rod (53221) is threadedly connected to the movable block (5322) and is fixedly rotatably installed on the fixed frame (51). The guide rod (53222) passes through the movable block (5322) and its two ends are fixed on the fixed frame (51).

5. The device for improving the deposition of loose bodies in the production of optical fiber preforms according to claim 1, characterized in that: The laser receiving component (6) comprises a laser receiver (61), a focusing piece (62) and an adjustment seat (63); the laser receiver (61) and the focusing piece (62) are arranged in parallel on the tower (1); the focusing piece (62) is arranged on the adjustment seat (63) and is located at one end of the laser receiver (61) close to the target rod (3); the adjustment seat (63) is movably connected to the tower (1); the focusing piece (62) comprises a convex lens (621), two adjustment frames (622) and an adjustment control (623); the adjustment frames (622) are relatively slidably arranged on the adjustment seat (63); the convex lens (621) is clamped between the two adjustment frames (622); and the bottom of each adjustment frame (622) is connected to a corresponding adjustment control (623).

6. The device for improving the deposition of loose bodies in the production of optical fiber preforms according to claim 5, characterized in that: The middle of the adjustment frame (622) is provided with an arc-shaped engaging groove (6221), the arc of the engaging groove (6221) is in contact with the outer arc of the convex lens (621), the adjustment control (623) comprises a bottom adjustment block (6231), an adjustment screw (6232) and a connecting block (6233), the connecting block (6233) is fixed on a side of the adjustment frame (622) away from each other, the bottom of the connecting block (6233) is fixed with the bottom of the bottom adjustment block (6231), the bottom adjustment block (6231) and the adjusting screw (6232) threaded connection, the axis of the adjusting screw (6232) is arranged along the length direction of the adjusting seat (63), and a locking member (64) is also arranged on the top of the adjusting frame (622), and the locking member (64) includes two locking clips (641), a locking rod (642) and two locking bolts (643), and the locking clips (641) are respectively vertically fixed on the top of the adjusting frame (622), and the locking rod (642) passes through the two locking clips (641) and is fixed at both ends by locking bolts (643).

7. The device for improving the deposition of loose bodies in the production of optical fiber preforms according to claim 6, characterized in that: The adjustment seat (63) is also relatively slidably arranged on the tower (1), the sliding direction of the adjustment seat (63) is parallel to the length direction of the tower (1), the tower (1) is extended with an adjustment frame (11) corresponding to the adjustment seat (63), the adjustment frame (11) is provided with an adjustment rod (111) and two guide rods (112) corresponding to the adjustment seat (63), the adjustment rod (111) and the guide rod (112) are both arranged along the length direction of the adjustment frame (11) and their axes are parallel, the guide rods (112) are symmetrically arranged on both sides of the adjustment rod (111), the adjustment rod (111) is threadedly connected to the adjustment seat (63), and both ends are positioned and rotatably installed on the adjustment frame (11), the guide rod (112) passes through the adjustment seat (63) and both ends are fixed on the adjustment frame (11).

8. The device for improving the deposition of loose bodies in the production of optical fiber preforms according to claim 5, characterized in that: The adjustment seat (63) is a lifting structure, and the adjustment seat (63) comprises two adjustment rods (631), two limit rods (632), an upper adjustment block (633) and a lower adjustment block (634). The two adjustment rods (631) are arranged at the diagonal of the upper adjustment block (633), and the two limit rods (632) are arranged at the other diagonal of the upper adjustment block (633). The upper adjustment block (633) is provided with outer adjustment blocks (6331) extending near the four corners. The adjustment rod (631) is rotatably mounted on the lower adjustment block (634) and is threadedly connected to the outer adjustment block (6331). The bottom of the limit rod (632) is fixed on the lower adjustment block (634) and passes through the outer adjustment block (6331).

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