A target rod holding device and a preform rod deposition apparatus

Abstract

The utility model relates to a target stick clamping device and prefabricated rod deposition equipment, including chuck body, be equipped with the connecting portion for connecting main rotating axle in the upper end of chuck body, the lower extreme of chuck body is equipped with the wear -resisting hole of convenient target stick transverse wear -resisting, the both sides of wear -resisting hole on chuck body correspond are equipped with the hanging groove for hanging target stick, the lower extreme of chuck body is configured with the elastic bushing for clamping target stick, the corresponding elastic bushing is configured with locking piece in the lower extreme outer periphery of chuck body. The utility model discloses through to the improvement of chuck body structure, makes target stick only need to pass wear -resisting hole and hanging groove can hang on chuck body, need not to move the equipment component of torch, will not influence the stability of equipment, reduces robot operation step and shift cycle time, has improved powder cooperation intelligent manufacturing robot shift efficiency to improve the degree of automation of optical fiber prefabricated rod manufacturing.

Description

Technical Field

[0001] This utility model belongs to the field of optical fiber manufacturing technology, specifically relating to a target rod clamping device and a preform deposition equipment. Background Technology

[0002] Optical fiber preforms are the core raw material for manufacturing silica optical fibers and a key factor affecting the performance of optical fiber communication. As one of the manufacturing methods for optical fiber preforms, vapor phase axial deposition (VAD) is favored by many manufacturers due to its high raw material utilization rate, small product outer diameter fluctuation, continuous production capability, and suitability for manufacturing large preforms. It has been widely developed and applied in recent years.

[0003] VAD (Vacuum-Adjustable Deposition) technology is more suitable for fabricating optical fiber preform cores. The VAD fabrication process includes: 1. Powder deposition; 2. Powder dehydration and sintering to form the optical fiber preform mother rod; 3. Stretching of the optical fiber preform mother rod, ultimately forming the core part of the optical fiber preform. The quality of the powder directly affects the main parameters of the optical fiber, such as the refractive index profile and mode field diameter. Therefore, precise control of the deposition process is crucial for ensuring the quality of the optical fiber.

[0004] In existing technologies, during most VAD deposition processes, the target rod is fixed to the lower end of a longitudinal push rod and rotates around the longitudinal axis of the push rod. Due to cost and operational inconvenience, the size of the target rod is typically no larger than 50mm. Because of the mismatch in thermal expansion coefficients between the target rod clamping devices, it is necessary to prevent potential damage to the target rod end face or deformation. To prevent such situations that could lead to target rod breakage and damage to the powder, or target rod deformation preventing transfer, this paper provides a target rod clamping device and preform deposition equipment to improve the automation of optical fiber preform manufacturing and enhance the powder transfer efficiency with intelligent manufacturing robots. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a target rod clamping device and preform deposition equipment to improve the automation of optical fiber preform manufacturing, in order to address the shortcomings of the existing technology.

[0006] This utility model is achieved using the following solution: A target rod clamping device is characterized in that it includes a clamping body, a connecting part for connecting a main rotating shaft is provided at the upper end of the clamping body, a through hole for facilitating the transverse insertion of the target rod is provided at the lower end of the clamping body, hanging grooves for hanging the target rod are provided on both sides of the through hole on the clamping body, an elastic bushing for clamping the target rod is provided at the lower end of the clamping body, and a locking element is provided on the outer periphery of the lower end of the clamping body corresponding to the elastic bushing.

[0007] According to the above technical solution, the chuck body has a central hole inside, and the through hole is connected to the central hole to form an arc-shaped structure.

[0008] According to the above technical solution, the mounting groove is a U-shaped groove structure.

[0009] According to the above technical solution, the connecting part is a flange structure installed on the upper end of the clamp body.

[0010] According to the above technical solution, the upper end of the flange structure is a plane, and the lower end is an inclined surface that is thinner on the outside and thicker on the inside.

[0011] According to the above technical solution, the central hole penetrates the upper and lower end faces of the chuck body.

[0012] According to the above technical solution, the inner hole at the lower end of the chuck body has a certain inclination angle to cooperate with the installation of the elastic bushing.

[0013] According to the above technical solution, the outer wall of the elastic bushing has a conical structure.

[0014] According to the above technical solution, the locking component is a locking nut, and the lower outer periphery of the chuck body is provided with an external thread that mates with the locking nut.

[0015] A preform deposition apparatus, characterized in that it includes a target rod clamping device as described above.

[0016] The beneficial effects of this utility model are as follows: 1. This utility model improves the structure of the chuck body, allowing the target rod to be hung on the chuck body simply through the insertion hole and mounting slot, eliminating the need to move the torch or other equipment components. This ensures the stability of the equipment, reduces robot operation steps and transfer cycle time, and improves the transfer efficiency of the intelligent manufacturing robot for powder preparation, thereby enhancing the automation level of optical fiber preform manufacturing. 2. By using a tapered spring bushing and locking components to fix the target rod to the chuck body, the impact of target rod hole deformation on the runout of the produced core rod is reduced. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a front view of the target rod clamping device provided in Embodiment 1 of this utility model.

[0019] Figure 2This is a side view of the target rod clamping device provided in Embodiment 1 of this utility model.

[0020] Figure 3 This is a schematic diagram of the preform deposition equipment provided in Embodiment 1 of this utility model.

[0021] Figure 4 This is a schematic diagram comparing PMD during the actual implementation of Embodiment 1 of this utility model.

[0022] Figure 5 This is a schematic diagram illustrating the efficiency improvement during the actual implementation of Embodiment 1 of this utility model.

[0023] Figure 6 This is a front view of the target rod clamping device provided in Embodiment 2 of this utility model.

[0024] Figure 7 This is a side view of the target rod clamping device provided in Embodiment 22 of this utility model. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Example 1: like Figure 1 , 2 As shown, this embodiment provides a target rod clamping device, including a clamping head 1. The upper end of the clamping head 1 is provided with a connecting part 101 for connecting to the main rotating shaft. The lower end of the clamping head is provided with a through hole 103 for facilitating the horizontal insertion of the target rod. On the clamping head, on both sides of the through hole, there are corresponding hanging grooves 104 with U-shaped groove structures for hanging the target rod. The lower end of the clamping head is provided with an elastic bushing 2 for clamping the target rod. A locking member 3 is provided on the outer periphery of the lower end of the clamping head corresponding to the elastic bushing.

[0027] In this embodiment, the chuck body has a central hole 102 inside, which penetrates the upper and lower end faces of the chuck body. The insertion hole 103 is connected to the central hole, forming an arc-shaped structure. When inserting the target rod, it directly passes through the insertion hole 103 laterally into the central hole 103, and then is hung on the mounting groove 104 by a pin.

[0028] In this embodiment, the connecting part 101 is a flange structure mounted on the upper end of the chuck body. The upper end of the flange structure is flat, and the lower end is an inclined surface that is thinner on the outside and thicker on the inside, which can effectively reduce the probability of target rod breakage and improve the transfer efficiency of the intelligent manufacturing robot. When it is connected to the main rotating shaft, the two are connected through the flange structure.

[0029] In this embodiment, the locking component 3 is a locking nut, and the lower outer periphery of the chuck body is provided with an external thread that mates with the locking nut.

[0030] The specific installation process is as follows: Install the locking nut and collet spring onto the upper target rod 4 in sequence. Install the special pin and hang it on the U-shaped changing slot of the collet body 1. Use the rod holder device to hang the target rod onto the collet body. Figure 1 Tighten the collet spring upwards and tighten the lock nut. (Example:) Figure 1 , 2 By tightening the nut and spring clamp, the target rod, push rod, and upper fixed end are aligned vertically; during the powder transfer stage, the powder can be directly grasped and transferred without the need for clamp release.

[0031] After sintering and a series of subsequent treatments, the PMD results of the optical fiber drawn from the optical fiber preform are as follows: The effect of the new target rod clamping device PMD is as follows: Figure 4 As shown, PMD levels decreased by approximately 52%.

[0032] This invention improves the chuck structure, allowing the target rod to be mounted on the chuck body simply through the insertion hole and mounting slot, eliminating the need to move the torch or other equipment components. This maintains equipment stability, reduces robot operation steps and transfer cycle time, and improves the transfer efficiency of the powder-blending intelligent manufacturing robot, thereby enhancing the automation level of optical fiber preform manufacturing. A schematic diagram illustrating the improved automation efficiency is shown below. Figure 5 As shown. The specific efficiency improvements are: 1. The number of steps in the deposition powder rod unloading process is reduced by 1 to 2, depending on the production workshop; 2. The average working time for the deposition powder rod unloading process is reduced by approximately 15%.

[0033] like Figure 3As shown, this embodiment also provides a preform deposition apparatus, including the target rod clamping device as described above. The preform deposition apparatus includes a powder preform conveying mechanism 9, a main rotating shaft 8, a chuck 1 (as described above), a target rod 4, a core layer torch 5, a cladding torch 6, and a deposition chamber 7. The main rotating shaft 8, the chuck 1, the target rod 4, the core layer torch 5, and the cladding torch 6 are all placed in the deposition chamber 7 and are vented through the exhaust port of the deposition chamber 7. The powder preform conveying mechanism 9 is used to convey the powder preform to form the target rod 4 below the main rotating shaft 8. The chuck 1 (as described above) is used to axially limit the target rod 4. During VAD deposition, two torches are typically used simultaneously, with the core layer torch 5 used for depositing the core layer and the cladding torch 6 used for depositing the cladding layer. The target rod 4 is fixed to the lower end of a longitudinal push rod and rotates along the longitudinal axis of the push rod.

[0034] Example 2: like Figure 6 , 7 As shown, the structure of this embodiment is basically the same as that of Embodiment 1, except for the structure of the chuck body 1 and the elastic bushing. Specifically, the inner hole at the lower end of the chuck body 1 has a certain inclination angle 10, which is used to accommodate the installation of the elastic bushing 2. The outer wall of the elastic bushing is a conical structure, and multiple adjustable holes that can be compressed and deformed are provided around the circumference of the conical structure. Specifically, it is a conical chuck spring structure.

[0035] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A target rod clamping device, characterized in that: The chuck body includes a connecting part for connecting the main rotating shaft at the upper end of the chuck body, a through hole for facilitating the horizontal insertion of the target rod at the lower end of the chuck body, hanging grooves for hanging the target rod on both sides of the through hole on the chuck body, an elastic bushing for clamping the target rod at the lower end of the chuck body, and a locking element corresponding to the elastic bushing at the lower outer periphery of the chuck body.

2. The target rod clamping device according to claim 1, characterized in that: The clamp body has a central hole inside, and the through hole is connected to the central hole to form an arc-shaped structure.

3. The target rod clamping device according to claim 1 or 2, characterized in that: The mounting groove has a U-shaped groove structure.

4. The target rod clamping device according to claim 1 or 2, characterized in that: The connecting part is a flange structure installed on the upper end of the clamp body.

5. The target rod clamping device according to claim 4, characterized in that: The upper end of the flange structure is a flat surface, and the lower end is an inclined surface that is thinner on the outside and thicker on the inside.

6. The target rod clamping device according to claim 2, characterized in that: The central hole penetrates the upper and lower end faces of the chuck body.

7. The target rod clamping device according to claim 1 or 2, characterized in that: The lower end of the chuck body has a certain inclination angle for installation with the elastic bushing.

8. The target rod clamping device according to claim 1 or 2, characterized in that: The outer wall of the elastic bushing is a conical structure, and multiple adjustment holes are provided around the circumference of the conical structure.

9. The target rod clamping device according to claim 1 or 2, characterized in that: The locking component is a locking nut, and the lower outer periphery of the chuck body is provided with an external thread that mates with the locking nut.

10. A preform deposition apparatus, characterized in that: Includes the target rod clamping device as described in any one of claims 1-9.

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