Machining device for variable-diameter barrel

Abstract

The machining device comprises a centering shaft, the centering shaft is integrally machined and formed by a cylindrical section and a circular truncated cone section which are distributed up and down, the diameter of the upper bottom of the circular truncated cone section is the same as that of the cylindrical section, and the diameter of the upper bottom of the circular truncated cone section is larger than that of the lower bottom of the circular truncated cone section; the centering assembly is connected to the outer wall of the centering shaft and comprises three centering plates connected to the outer wall of the circular truncated cone section, the three centering plates are sequentially defined as a first centering plate, a second centering plate and a third centering plate which are distributed up and down, and the first centering plate, the second centering plate and the third centering plate are all circular plates; and the diameters of the first centering plate, the second centering plate and the third centering plate are sequentially reduced. By means of the mode that the centering shaft is matched with the centering assembly, when the circular truncated cone section of the guide cylinder is subjected to edge rolling, welding and other machining, the inner wall of the circular truncated cone section of the guide cylinder is centered, the circumferential degree of the inner wall of the circular truncated cone section of the guide cylinder can be ensured, and correspondingly, the circumferential degree of the whole circular truncated cone section of the guide cylinder is also ensured.

Description

Technical Field

[0001] The utility model relates to the field of single crystal furnace processing, in particular to a processing device for a variable diameter cylinder. Background Art

[0002] A single crystal furnace is a device that uses a graphite heater to melt polycrystalline materials such as polysilicon and grows dislocation-free single crystals using the Czochralski method. During the single crystal pulling process, inert gas (mainly nitrogen and helium) must be introduced as a protective layer to ensure a stable crystal growth environment, and the gas is guided through a guide tube to ensure stable gas circulation. The guide tube, also known as a heat shield, not only serves as a guide, but also serves to separate the inside and outside of the single crystal furnace's thermal field, making the external temperature much lower than the internal temperature, thereby accelerating the single crystal pulling speed. In the single crystal furnace's thermal field, the guide tube is a key component that affects the crystal pulling size, pulling speed, and process.

[0003] There is currently a type of guide tube that is composed of a cylindrical section at the top and a conical section at the bottom. Both the cylindrical section and the conical section are hollow structures with openings on both the top and bottom. The upper base of the conical section is the same size as the diameter of the cylindrical section, while the upper base of the conical section is larger than the lower base. Due to the inherent shape of the conical section in this guide tube, rolling and welding are relatively complex processes. In particular, ensuring the circularity of the side of the conical section often requires multiple adjustments, which is time-consuming and labor-intensive. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a processing device for a variable diameter cylinder which is convenient for processing a guide cylinder.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: a processing device for a variable diameter cylinder, the innovation of which is: comprising

[0006] A centering shaft, wherein the centering shaft is integrally formed by a cylindrical section and a truncated cone section distributed above and below, wherein the diameter of the upper base of the truncated cone section is the same as the diameter of the cylindrical section, and the diameter of the upper base of the truncated cone section is larger than the diameter of the lower base of the truncated cone section;

[0007] A centering assembly connected to the outer wall of the centering shaft, the centering assembly includes three centering plates connected to the outer wall of the truncated cone segment, and are defined as a first centering plate, a second centering plate and a third centering plate distributed up and down, the first centering plate, the second centering plate and the third centering plate are all circular plates, and the diameters of the first centering plate, the second centering plate and the third centering plate decrease in sequence.

[0008] Furthermore, the first centering plate is located at the connection between the truncated cone segment and the cylindrical segment, the third centering plate is located at the end of the truncated cone segment away from the cylindrical segment, and the second centering plate is located in the middle of the truncated cone segment.

[0009] Furthermore, a fourth centering plate is connected to the outer wall of the cylindrical section. The fourth centering plate is a circular plate, and the diameter of the fourth centering plate is the same as the diameter of the first centering plate. The fourth centering plate is threadedly fixed to the cylindrical section. An external thread structure is provided on the outer wall of the cylindrical section away from the conical section, and a limit plate is also provided on the side of the cylindrical section where the external thread structure is close to the conical section.

[0010] The advantage of the present invention is that the centering shaft cooperates with the centering assembly to center the inner wall of the conical section of the guide tube when the conical section of the guide tube is rolled, welded, or processed. Therefore, no matter rolling, welding, or other processing is performed, the circularity of the inner wall of the conical section of the guide tube can be ensured, and the circularity of the entire conical section of the guide tube is correspondingly ensured. Only one centering is required to complete the processing, and no multiple corrections are required, which facilitates the processing of the conical section of the guide tube.

[0011] The distribution positions of the first centering plate, the second centering plate and the third centering plate are controlled so that when the conical section of the guide tube is rolled or welded, only three centering plates are needed to ensure the control of the circumference of the inner wall of the conical section of the guide tube, thereby reducing the number of centering plates and facilitating the processing of the conical section of the guide tube.

[0012] By arranging a fourth centering plate on the outer wall of the cylindrical section, it is convenient to perform subsequent processing of the cylindrical section of the guide tube, and the same processing device can be used to simultaneously process the cylindrical section and the frustum section of the guide tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of a processing device for a variable diameter cylinder of the present invention. DETAILED DESCRIPTION

[0014] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the following is a detailed description of the specific implementation method, structure, characteristics and effects of the present invention in combination with the accompanying drawings and preferred embodiments.

[0015] like Figure 1 The processing device for a variable diameter cylinder shown in the figure comprises

[0016] A fixed centering shaft is formed by integrally processing a cylindrical section 1 and a truncated cone section 2 distributed above and below, and the diameter of the upper bottom of the truncated cone section 2 is the same as the diameter of the cylindrical section 1, and the diameter of the upper bottom of the truncated cone section 2 is larger than the diameter of the lower bottom of the truncated cone section 2.

[0017] A centering assembly connected to the outer wall of the centering shaft, the centering assembly includes three centering plates connected to the outer wall of the truncated cone segment, and are defined as a first centering plate 3, a second centering plate 4 and a third centering plate 5 distributed up and down, and the center positions of the first centering plate 3, the second centering plate 4 and the third centering plate 5 are all provided with through holes that can still allow the truncated cone segment 2 to pass through, the first centering plate 3, the second centering plate 4 and the third centering plate 5 are all circular plates, and the diameters of the first centering plate 3, the second centering plate 4 and the third centering plate 5 are The outer circumferential walls of the first centering plate 3, the second centering plate 4 and the third centering plate 5 are all inclined surfaces, and the inclination direction of the inclined surfaces is gradually inclined from top to bottom toward the centering axis. By setting the inclined inclined surfaces, the first centering plate 3, the second centering plate 4 and the third centering plate 5 can be better fitted with the inner wall of the conical section of the guide tube when they are matched with the inner wall of the conical section of the guide tube, so as to facilitate subsequent processing.

[0018] The first centering plate 3 is located at the junction of the conical segment 2 and the cylindrical segment 1. The third centering plate 5 is located at the end of the conical segment 2 away from the cylindrical segment 1. The second centering plate 4 is located in the middle of the conical segment 2. The control of the distribution of the first, second, and third centering plates 3, 4, and 5 ensures that only three centering plates are needed to effectively control the circularity of the inner wall of the conical segment of the guide tube when rolling or welding the conical segment of the guide tube. This reduces the number of centering plates and facilitates the processing of the conical segment of the guide tube.

[0019] A fourth centering plate 6 is also connected to the outer wall of the cylindrical section 1. The fourth centering plate 6 is a circular plate, and the diameter of the fourth centering plate 6 is the same as the diameter of the first centering plate 3. The fourth centering plate 6 is threadedly fixed to the cylindrical section. A threaded through hole is provided in the center of the fourth centering plate 6 for the cylindrical section 1 to pass through. An external thread structure is provided on the outer wall of the cylindrical section 1 away from the truncated cone section 2, which is threadedly matched with the threaded through hole of the fourth positioning plate 6. A limiting plate 7 is also provided on the side of the cylindrical section 1 where the external thread structure is close to the truncated cone section 2. The limiting plate 7 is welded and fixed to the cylindrical section 1. The cooperation of the limiting plate 7 serves to provide a hard limit to the movement of the fourth centering plate 6. By providing the fourth centering plate 6 on the outer wall of the cylindrical section 1, the subsequent processing of the cylindrical section of the guide tube is facilitated, and the same processing device can be used to simultaneously process the cylindrical section and the truncated cone section of the guide tube.

[0020] The processing device in the present invention cooperates with the centering shaft and the centering component to play a centering role on the inner wall of the conical section of the guide tube when the conical section of the guide tube is rolled, welded, etc., so that the circumference of the inner wall of the conical section of the guide tube can be ensured regardless of rolling, welding or other processing, and the circumference of the entire conical section of the guide tube is correspondingly ensured. Only one centering is required to complete the processing, and no multiple corrections are required, which facilitates the processing of the conical section of the guide tube.

[0021] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A processing device for a variable diameter cylinder, characterized in that: include A centering shaft, wherein the centering shaft is integrally formed by a cylindrical section and a truncated cone section distributed above and below, wherein the diameter of the upper base of the truncated cone section is the same as the diameter of the cylindrical section, and the diameter of the upper base of the truncated cone section is larger than the diameter of the lower base of the truncated cone section; A centering assembly connected to the outer wall of the centering shaft, the centering assembly includes three centering plates connected to the outer wall of the truncated cone segment, and are defined as a first centering plate, a second centering plate and a third centering plate distributed up and down, the first centering plate, the second centering plate and the third centering plate are all circular plates, and the diameters of the first centering plate, the second centering plate and the third centering plate decrease in sequence.

2. The processing device for a variable diameter cylinder according to claim 1, characterized in that: The first centering plate is located at the connection between the truncated cone segment and the cylindrical segment, the third centering plate is located at the end of the truncated cone segment away from the cylindrical segment, and the second centering plate is located in the middle of the truncated cone segment.

3. The processing device for a variable diameter cylinder according to claim 1, characterized in that: A fourth centering plate is also connected to the outer wall of the cylindrical section. The fourth centering plate is a circular plate, and the diameter of the fourth centering plate is the same as the diameter of the first centering plate. The fourth centering plate is threadedly fixed to the cylindrical section. An external thread structure is provided on the outer wall of the cylindrical section away from the conical section, and a limit plate is also provided on the side of the cylindrical section where the external thread structure is close to the conical section.

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