Quartz crucible forming device, quartz crucible forming method and quartz crucible

Abstract

The invention discloses a quartz crucible forming device, a quartz crucible forming method and a quartz crucible. The quartz crucible forming device comprises an outer mold, an inner mold and a telescopic forming assembly, the outer mold can circumferentially rotate along the axis of the outer mold; the inner mold is coaxially fixed in the outer mold, and a gap is reserved between the outer wall of the inner mold and the inner wall of the outer mold to form a clamping cavity for accommodating quartz sand; the telescopic forming assembly is arranged in the inner mold along the axis of the inner mold and can penetrate through the outer wall of the inner mold in a reciprocating mode so as to adjust the distance between the telescopic forming assembly and the inner wall of the outer mold. Quartz sand can be compacted and attached to the inner wall of the outer mold layer by layer, manual forming operation can be replaced, a large amount of sand can be rapidly added, the forming time is prolonged, the uniformity of the inner layer and the outer layer of the quartz sand can be effectively improved when the quartz crucible is formed, the density of each sand layer is improved, and the production efficiency is improved. And the generation of influencing mixed materials during the forming of the quartz crucible is reduced, so that the product quality of the quartz crucible is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of quartz crucibles, and in particular to a quartz crucible forming device, a quartz crucible forming method and a quartz crucible. Background Art

[0002] Semiconductor quartz crucibles are currently primarily produced using a high-temperature arc melting method. To prepare the crucible, various high-purity quartz sands are poured into the inner surface of a mold. The crucible is then manually shaped using the centrifugal force of the rotating mold and forming rods. The crucible-shaped rotating mold is then moved to the electrode position. The electrode is then lowered, the arc is struck, and the electrode is inserted into the formed powder cavity, rapidly melting it into a crucible-shaped quartz. After cooling, the crucible is removed, completing the production of a quartz crucible blank. This manual process, coupled with significant interference from mold rotation, results in varying product quality depending on the operator. Furthermore, mixing of the inner and outer layers of quartz sand can occur, severely impacting product quality and leading to defects in the crucible's crystal pulling process. Summary of the Invention

[0003] In order to solve the technical problems existing in the above technology, it is necessary to provide a quartz crucible forming device.

[0004] A quartz crucible forming device comprises an outer mold, an inner mold, and a telescopic forming assembly; The outer mold can rotate circumferentially along its own axis; The inner mold is coaxially fixed in the outer mold, and a gap is left between the outer wall of the inner mold and the inner wall of the outer mold to form a cavity for accommodating quartz sand; The telescopic molding component is built into the inner mold along the axis of the inner mold. The telescopic molding component can reciprocate through the outer wall of the inner mold to adjust the distance between the telescopic molding component and the inner wall of the outer mold.

[0005] Preferably, the telescopic forming assembly includes an adjusting rod, a connecting frame, a support arm, and a U-shaped forming plate; the two sides and the bottom of the U-shaped forming plate slide through the inner mold, the adjusting rod is built into the inner mold along the axial direction of the inner mold, the connecting frame is threadedly installed on the adjusting rod, and the two ends of the support arm are respectively hinged to the connecting frame and the inner wall of the U-shaped forming plate, so that when the adjusting rod is rotated, it can drive the connecting frame to move up and down along the adjusting rod, and then the connecting frame drives the support arm to push and pull the U-shaped forming plate along the outer wall of the inner mold to adjust the distance between the U-shaped forming plate and the inner wall of the outer mold.

[0006] Preferably, the inner mold has a U-shaped guide hole for the U-shaped forming plate to pass through.

[0007] Preferably, the U-shaped forming plate includes a left forming bar and a right forming bar, and the left forming bar and the right forming bar are symmetrically installed in the U-shaped guide hole on the inner mold, the lower parts of the left forming bar and the right forming bar are slidably inserted, and the inner walls of the left forming bar and the right forming bar are hinged to the support arm, so that the support arm can drive the left forming bar and the right forming bar to slide along the U-shaped guide hole.

[0008] Preferably, the upper end of the U-shaped guide hole is in a T-shaped structure, and the upper ends of the left and right forming strips have guide blocks that are adapted to the structural dimensions of the upper end of the U-shaped guide hole.

[0009] Preferably, the upper end of the U-shaped guide hole is a downwardly inclined guide slope, and the upper ends of the left and right forming strips have guide slopes that are compatible with the upper end structure of the U-shaped guide hole.

[0010] Preferably, a support plate is provided above the inner mold and the outer mold, and the support plate is rotatably connected to the adjustment rod.

[0011] Preferably, a feeding pipe is further provided above the inner mold and the outer mold, and the outlet end of the feeding pipe faces the cavity formed between the outer wall of the inner mold and the inner wall of the outer mold.

[0012] It is also necessary to provide a method for forming a quartz crucible.

[0013] A quartz crucible forming method, using the above-mentioned quartz crucible forming device to form the crucible, comprises the following steps: Step S1: Adjust the positions of the outer mold and the inner mold to ensure that they are coaxial and a certain space is reserved between the inner mold and the outer mold. Rotate only the outer mold at a certain speed, and then add quartz sand into the clamping cavity through the feeding pipe until the entire clamping cavity is filled. Step S2: Control the adjusting rod to rotate forward, so that the U-shaped forming plate slowly expands outward along the U-shaped guide hole, evenly distributes and compacts the quartz sand to adhere to the inner wall of the outer mold, and completes the formation of the first layer of sand; Step S3: Keep the outer mold rotating and control the adjusting rod to rotate in the opposite direction, so that the U-shaped forming plate slowly shrinks inward along the U-shaped guide hole, ensuring that a certain space is left between the U-shaped forming plate and the first layer of sand, and then add quartz sand into the clamping cavity through the feeding pipe until the entire space is filled; Step S4: According to the thickness parameter, the feed rate is reduced and the adjusting rod is controlled to rotate in the positive direction, so that the U-shaped forming plate slowly expands outward along the U-shaped guide hole, and the quartz sand is evenly distributed and compacted to adhere to the first layer of sand, completing the formation of the second layer of sand; Step S5: Keep the outer mold rotating and control the adjusting rod to rotate in the opposite direction, so that the U-shaped forming plate slowly shrinks inward along the U-shaped guide hole, ensuring that a certain space is left between the U-shaped forming plate and the second layer of sand, and then add quartz sand into the clamping cavity through the feeding pipe until the entire space is filled; Step S6: According to the thickness parameter, the feed rate is reduced and the adjusting rod is controlled to rotate in the forward direction, so that the U-shaped forming plate slowly expands outward along the U-shaped guide hole, and the quartz sand is evenly distributed and compacted to adhere to the second layer of sand, completing the formation of the third layer of sand; Step S7: Control the adjusting rod to rotate in the opposite direction, so that the U-shaped forming plate shrinks to the initial position along the U-shaped guide hole, and after the entire telescopic forming assembly and the inner mold are lifted, the quartz crucible forming process is completed, and the next process is to melt the crucible.

[0014] It is also necessary to provide a quartz crucible.

[0015] A quartz crucible is manufactured using the above-mentioned quartz crucible forming method.

[0016] Compared with the prior art, the quartz crucible forming device, quartz crucible forming method and quartz crucible provided by the present invention adopt a split U-shaped forming plate, and the distance between the U-shaped forming plate and the inner wall of the outer mold is controlled by an adjusting rod. By relying on the rotation of the outer mold and the cooperation between the U-shaped forming plates, the quartz sand is compacted layer by layer and attached to the inner wall of the outer mold. It can not only replace manual forming operations, but also realize rapid and large-scale sand addition, thereby shortening the forming time, and effectively improve the uniformity of the inner and outer layers of the quartz sand during the forming of the quartz crucible, increase the density of each sand layer, reduce the generation of mixing during the forming of the quartz crucible, and thus greatly improve the product quality of the quartz crucible. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a structural schematic diagram of the present invention.

[0019] Figure 2 It is a schematic cross-sectional structural diagram of one embodiment of the present invention.

[0020] Figure 3 It is a schematic cross-sectional structural diagram of a telescopic forming assembly in one embodiment of the present invention.

[0021] Figure 4 For the present invention Figure 3Schematic diagram of the top view of the U-shaped forming plate.

[0022] Figure 5 This is a schematic structural diagram of an inner mold in one embodiment of the present invention.

[0023] Figure 6 For the present invention Figure 5 Schematic diagram of the structure from another angle.

[0024] Figure 7 It is a schematic cross-sectional structural diagram of another embodiment of the present invention.

[0025] Figure 8 It is a schematic cross-sectional structural diagram of a telescopic molding assembly in another embodiment of the present invention.

[0026] Figure 9 For the present invention Figure 8 Schematic diagram of the top view of the U-shaped forming plate.

[0027] Figure 10 Schematic diagram of the structure of the inner mold in another embodiment of the present invention.

[0028] Figure 11 For the present invention Figure 10 Schematic diagram of the cross-sectional structure of AA.

[0029] In the figure: outer mold 01, inner mold 02, U-shaped guide hole 21, telescopic molding assembly 03, adjusting rod 31, connecting frame 32, support arm 33, U-shaped molding plate 34, left molding strip 341, right molding strip 342, clamping cavity 04, guide block 05, guide slope 06, guide slope 07, support plate 08, feeding pipe 09. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner", "lower" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0032] Please see Figure 1 、 Figure 2 、 Figure 7, the present invention provides a quartz crucible forming device, including an outer mold 01, an inner mold 02, and a telescopic forming component 03; The outer mold 01 can rotate circumferentially along its own axis; The inner mold 02 is coaxially fixed inside the outer mold 01, and a gap is left between the outer wall of the inner mold 02 and the inner wall of the outer mold 01 to form a cavity 04 for accommodating quartz sand. The telescopic molding component 03 is built into the inner mold 02 along the axis of the inner mold 02 , and the telescopic molding component 03 can reciprocate through the outer wall of the inner mold 02 to adjust the distance between the telescopic molding component 03 and the inner wall of the outer mold 01 .

[0033] In one embodiment, the telescopic forming assembly 03 includes an adjusting rod 31, a connecting frame 32, a support arm 33, and a U-shaped forming plate 34; the two sides and the bottom of the U-shaped forming plate 34 slide through the inner mold 02, the adjusting rod 31 is built into the inner mold 02 along the axial direction of the inner mold 02, the connecting frame 32 is threadedly installed on the adjusting rod 31, one end of the support arm 33 is hinged to the connecting frame 32, and the other end is hinged to the inner wall of the U-shaped forming plate 34, so that the support arm 33 is installed in an inclined manner; when the adjusting rod 31 rotates, it can drive the connecting frame 32 to move up and down along the adjusting rod 31, and then the connecting frame 32 drives the support arm 33 to push and pull the U-shaped forming plate 34 along the outer wall of the inner mold 02 to adjust the distance between the U-shaped forming plate 34 and the inner wall of the outer mold 01.

[0034] Of course, a support plate 08 is also provided above the inner mold 02 and the outer mold 01, and the support plate 08 is rotatably connected to the adjusting rod 31; and a motor can be installed at the input end of the adjusting rod 31 to realize the rotation of the adjusting rod 31. For the motor, a variable frequency motor can be selected.

[0035] Secondly, to facilitate the addition of quartz sand, a feeding tube 09 is installed above the inner and outer molds 02 and 01. A material leaker can be installed at the inlet of feeding tube 09; the outlet of feeding tube 09 faces the sandwich cavity 04 formed between the outer wall of inner mold 02 and the inner wall of outer mold 01. Furthermore, to reduce the impact of falling quartz sand, feeding tube 09 is designed in an N-shaped structure.

[0036] In one embodiment, the inner mold 02 has a U-shaped guide hole 21 for the U-shaped forming plate 34 to pass through.

[0037] In one embodiment, the U-shaped forming plate 34 includes a left forming bar 341 and a right forming bar 342. The left forming bar 341 and the right forming bar 342 are symmetrically installed in the U-shaped guide hole 21 on the inner mold 02. The lower parts of the left forming bar 341 and the right forming bar 342 are slidably inserted, and the inner walls of the left forming bar 341 and the right forming bar 342 are hinged to the support arm 33, so that the support arm 33 can drive the left forming bar 341 and the right forming bar 342 to slide along the U-shaped guide hole 21.

[0038] Please see Figures 2 to 6 In one embodiment, the upper end of the U-shaped guide hole 21 is a T-shaped structure, and the upper ends of the left molding strip 341 and the right molding strip 342 have a guide block 05 that is adapted to the structural dimensions of the upper end of the U-shaped guide hole 21.

[0039] Please see Figures 7 to 11 In one embodiment, the upper end of the U-shaped guide hole 21 forms a downwardly inclined guide slope 06, and the upper ends of the left and right molding strips 341 and 342 have guide slopes 07 that match the upper end structure of the U-shaped guide hole 21. When the adjustment rod 31 rotates, the support arm 33 pushes and pulls the upper ends of the left and right molding strips 341 and 342 along the guide slope 06. This enables the left and right molding strips 341 and 342 to move radially and axially within the inner mold 02, thereby adjusting the distance between the left and right molding strips 341 and 342 at the sides and bottom of the clamping cavity 04, thereby compacting and attaching the quartz sand.

[0040] In one embodiment, the present invention provides a quartz crucible forming method, which uses the quartz crucible forming device to form the crucible, comprising the following steps: Step S1: Adjust the positions of the outer mold 01 and the inner mold 02. After centering and positioning, ensure that the outer mold 01 and the inner mold 02 are coaxial and a certain space is reserved between the inner mold 02 and the outer mold 01. Rotate only the outer mold 01 at a certain speed, and then add quartz sand into the clamping cavity 04 through the feeding pipe 09 until the entire clamping cavity 04 is filled. Step S2: Control the adjusting rod 31 to rotate forward, causing the U-shaped forming plate 34 to slowly expand outward along the U-shaped guide hole 21. Utilizing the rotational force of the outer mold 01 and the centrifugal force generated therefrom, combined with the extrusion of the U-shaped forming plate 34, the quartz sand is evenly distributed and compacted onto the inner wall of the outer mold 01, completing the formation of the first layer of sand. Step S3: Keep the outer mold 01 rotating and control the adjusting rod 31 to rotate in the opposite direction, so that the U-shaped forming plate 34 slowly shrinks inward along the U-shaped guide hole 21, ensuring that a certain space is left between the U-shaped forming plate 34 and the first layer of sand. Then, quartz sand is added into the clamping cavity 04 through the feeding pipe 09 until the entire space is filled. Step S4: Based on the thickness parameter, the feed rate is reduced and the adjusting rod 31 is controlled to rotate in the forward direction, so that the U-shaped forming plate 34 slowly expands outward along the U-shaped guide hole 21. The rotational force of the outer mold 01 and the centrifugal force generated are combined with the extrusion of the U-shaped forming plate 34 to evenly distribute the quartz sand and compact it onto the first layer of sand, completing the formation of the second layer of sand. Step S5: Keep the outer mold 01 rotating and control the adjusting rod 31 to rotate in the opposite direction, so that the U-shaped forming plate 34 slowly contracts inward along the U-shaped guide hole 21, ensuring that a certain space is left between the U-shaped forming plate 34 and the second layer of sand. Then, quartz sand is added into the clamping cavity 04 through the feeding pipe 09 until the entire space is filled. Step S6: Based on the thickness parameter, the feed rate is reduced and the adjusting rod 31 is controlled to rotate forward, causing the U-shaped forming plate 34 to slowly expand outward along the U-shaped guide hole 21. The rotational force of the outer mold 01 and the centrifugal force generated therefrom, combined with the extrusion of the U-shaped forming plate 34, evenly distribute the quartz sand and compact it onto the second layer of sand, completing the formation of the third layer of sand. Step S7: Control the adjusting rod 31 to rotate in the opposite direction, so that the U-shaped forming plate 34 shrinks to the initial position along the U-shaped guide hole 21, and after lifting the entire telescopic forming assembly 03 and the inner mold 02, the quartz crucible forming process is completed and the next process is to be carried out for crucible melting.

[0041] In one embodiment, the present invention provides a quartz crucible manufactured using the quartz crucible forming method.

[0042] The above disclosure is only a preferred embodiment of the present invention, and it is certainly not intended to limit the scope of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiment and equivalent changes made in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A quartz crucible forming device, characterized in that: It includes outer mold, inner mold and telescopic molding components; The outer mold can rotate circumferentially along its own axis; The inner mold is coaxially fixed in the outer mold, and a gap is left between the outer wall of the inner mold and the inner wall of the outer mold to form a cavity for accommodating quartz sand; The telescopic molding component is built into the inner mold along the axis of the inner mold. The telescopic molding component can reciprocate through the outer wall of the inner mold to adjust the distance between the telescopic molding component and the inner wall of the outer mold.

2. The quartz crucible forming device according to claim 1, characterized in that: The telescopic forming assembly includes an adjusting rod, a connecting frame, a support arm, and a U-shaped forming plate; the two sides and the bottom of the U-shaped forming plate slide through the inner mold, the adjusting rod is built into the inner mold along the axial direction of the inner mold, the connecting frame is threadedly installed on the adjusting rod, and the two ends of the support arm are respectively hinged to the connecting frame and the inner wall of the U-shaped forming plate, so that when the adjusting rod is rotated, it can drive the connecting frame to move up and down along the adjusting rod, and then the connecting frame drives the support arm to push and pull the U-shaped forming plate along the outer wall of the inner mold to adjust the distance between the U-shaped forming plate and the inner wall of the outer mold.

3. The quartz crucible forming device according to claim 2, characterized in that: The inner mold is provided with a U-shaped guide hole for the U-shaped forming plate to pass through.

4. The quartz crucible forming device according to claim 3, characterized in that: The U-shaped forming plate includes a left forming bar and a right forming bar, and the left forming bar and the right forming bar are symmetrically installed in the U-shaped guide hole on the inner mold. The lower parts of the left forming bar and the right forming bar are slidably inserted, and the inner walls of the left forming bar and the right forming bar are hinged to the support arm, so that the support arm can drive the left forming bar and the right forming bar to slide along the U-shaped guide hole.

5. The quartz crucible forming device according to claim 4, characterized in that: The upper end of the U-shaped guide hole is in a T-shaped structure, and the upper ends of the left and right forming strips are provided with guide blocks that are adapted to the structural dimensions of the upper end of the U-shaped guide hole.

6. The quartz crucible forming device according to claim 4, characterized in that: The upper end of the U-shaped guide hole is a downwardly inclined guide slope, and the upper ends of the left and right forming strips have guide slopes that are compatible with the upper end structure of the U-shaped guide hole.

7. The quartz crucible forming device according to claim 2, characterized in that: A support plate is further provided above the inner mold and the outer mold, and the support plate is rotatably connected to the adjusting rod.

8. The quartz crucible forming device according to claim 1, characterized in that: A feeding pipe is further provided above the inner mold and the outer mold, and an outlet end of the feeding pipe faces the clamping cavity formed between the outer wall of the inner mold and the inner wall of the outer mold.

9. A method for forming a quartz crucible, comprising: forming the crucible using the quartz crucible forming device according to any one of claims 1 to 8, wherein: The following steps are included: Step S1: Adjust the positions of the outer mold and the inner mold to ensure that they are coaxial and a certain space is reserved between the inner mold and the outer mold. Rotate only the outer mold at a certain speed, and then add quartz sand into the clamping cavity through the feeding pipe until the entire clamping cavity is filled. Step S2: Control the adjusting rod to rotate forward, so that the U-shaped forming plate slowly expands outward along the U-shaped guide hole, evenly distributes and compacts the quartz sand to adhere to the inner wall of the outer mold, and completes the formation of the first layer of sand; Step S3: Keep the outer mold rotating and control the adjusting rod to rotate in the opposite direction, so that the U-shaped forming plate slowly shrinks inward along the U-shaped guide hole, ensuring that a certain space is left between the U-shaped forming plate and the first layer of sand, and then add quartz sand into the clamping cavity through the feeding pipe until the entire space is filled; Step S4: According to the thickness parameter, the feed rate is reduced and the adjusting rod is controlled to rotate in the positive direction, so that the U-shaped forming plate slowly expands outward along the U-shaped guide hole, and the quartz sand is evenly distributed and compacted to adhere to the first layer of sand, completing the formation of the second layer of sand; Step S5: Keep the outer mold rotating and control the adjusting rod to rotate in the opposite direction, so that the U-shaped forming plate slowly shrinks inward along the U-shaped guide hole, ensuring that a certain space is left between the U-shaped forming plate and the second layer of sand, and then add quartz sand into the clamping cavity through the feeding pipe until the entire space is filled; Step S6: According to the thickness parameter, the feed rate is reduced and the adjusting rod is controlled to rotate in the forward direction, so that the U-shaped forming plate slowly expands outward along the U-shaped guide hole, and the quartz sand is evenly distributed and compacted to adhere to the second layer of sand, completing the formation of the third layer of sand; Step S7: Control the adjusting rod to rotate in the opposite direction, so that the U-shaped forming plate shrinks to the initial position along the U-shaped guide hole, and after the entire telescopic forming assembly and the inner mold are lifted, the quartz crucible forming process is completed, and the next process is to melt the crucible.

10. A quartz crucible manufactured using the quartz crucible forming method according to claim 9.

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