Forming die capable of improving strength of upper opening of quartz crucible

Abstract

The invention discloses a forming mold capable of improving the strength of an upper opening of a quartz crucible, and belongs to the technical field of crucible forming, the forming mold comprises an outer mold and an inner mold, the outer mold and the inner mold are spaced to form a forming cavity for the crucible, and the outer mold comprises an outer side main mold body and an outer side ring mold body arranged at the bowl opening of the outer side main mold body; the inner mold comprises an inner side main mold body and an inner side ring mold body arranged at the bowl opening of the inner side main mold body, the inner side ring mold body is coaxially arranged on the inner side of the outer side ring mold body, the inner side ring mold body and the outer side ring mold body are connected with a pressing assembly, and the pressing assembly is used for pressing the inner side ring mold body and the outer side ring mold body to the outer side main mold body and the inner side main mold body correspondingly. The inner side ring die body and the outer side ring die body are separated to form a margin accommodating cavity; the outer side main mold body is connected with a separation assembly at the same time, and the separation assembly controls the outer side main mold body and the inner side main mold body to be separated from the outer side ring mold body and the inner side ring mold body respectively. By adopting the mold disclosed by the invention, the strength of the upper opening of the quartz crucible can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of crucible forming equipment, and in particular relates to a forming mold capable of improving the upper mouth strength of a quartz crucible. Background Art

[0002] Quartz crucible is a consumable vessel for pulling single crystal silicon. One quartz crucible is used for each furnace of single crystal silicon. Quartz crucible is a key necessity for single crystal silicon production. Therefore, the demand for single crystal silicon is proportional to the demand for quartz crucible. The existing crucible production quantity is far from meeting the needs of the domestic single crystal silicon industry.

[0003] The strength of the top of the quartz crucible has a strong correlation with the yield of crystal pulling. At present, the top strength of the crucible in the industry is generally weak. Studies have shown that during the forming process of the crucible, bubbles will be generated at the top position due to incomplete combustion of raw materials. The bubbles float to the top position, thus affecting the top strength of the quartz crucible. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a molding die capable of improving the strength of the upper end of a quartz crucible, thereby improving the strength of the upper end of a quartz crucible.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention discloses a molding die capable of improving the upper mouth strength of a quartz crucible, comprising an outer mold and an inner mold, wherein a molding cavity for the crucible is formed between the outer mold and the inner mold, wherein the outer mold comprises an outer main mold body and an outer ring mold body arranged at the bowl mouth of the outer main mold body, wherein the inner mold comprises an inner main mold body and an inner ring mold body arranged at the bowl mouth of the inner main mold body, wherein the inner ring mold body is coaxially arranged on the inner side of the outer ring mold body, wherein the inner ring mold body and the outer ring mold body are connected with a clamping assembly, wherein the clamping assembly is used to respectively clamp the inner ring mold body and the outer ring mold body to the outer main mold body and the inner main mold body, wherein a residual accommodating cavity is formed between the inner ring mold body and the outer ring mold body; wherein the outer main mold body is simultaneously connected with a disengagement assembly, wherein the disengagement assembly controls the outer main mold body and the inner main mold body to disengage from the outer ring mold body and the inner ring mold body respectively.

[0007] Furthermore, the clamping assembly includes a pressure plate, a cylinder, a support rod, a connecting plate, and a vertical displacement drive device that drives the pressure plate to move up and down. A connecting plate is connected between the inner ring mold body and the outer ring mold body. The upper side of the connecting rod is connected to the cylinder through the support rod, and the cylinder is fixed to the lower side of the pressure plate.

[0008] Furthermore, a plurality of floating pressure blocks are arranged between the outer ring die body and the inner ring die body, and the floating pressure blocks are evenly distributed in a ring shape along the circumference of the outer ring die body; a plurality of guide rods corresponding to the floating pressure blocks are distributed in a ring shape at the lower end of the cylinder body, and the lower ends of the guide rods slide through the through holes provided on the floating pressure blocks; an elastic support device and a displacement sensor are installed between the floating pressure block and the cylinder body; a heating device is arranged on the inner side of the inner ring die body, and the heating device is connected to a planar displacement driving device.

[0009] Furthermore, a circular hole is formed at the center of the pressure plate, and the planar displacement driving device includes a rotating ring, a gear, a rack, a motor and a connecting part. The rotating ring is rotatably installed on the inner wall of the circular hole, and the upper end of the heating device is connected to the rack through the connecting part. The rack extends along the radial direction of the rotating ring and slides with the rotating ring. The rack is meshed with the gear, and the gear is driven to rotate by the motor installed on the rotating ring.

[0010] Furthermore, at least one guide rod is a hollow rod, the lower end of the hollow rod is connected to the molding cavity, and the lower end of the cylinder is formed with an injection port connected to the hollow rod.

[0011] Furthermore, a support rod is connected to the pressing plate, and the support rod extends along the radial direction of the cylinder. The inner end of the support rod is connected to a positioning seat through a telescopic device, and the positioning seat is used to position the position of the inner main mold body.

[0012] Furthermore, a pin is connected to the outer end of the support rod, and the pin is rotatably matched with the pressure plate, so that the support rod can rotate in a horizontal plane.

[0013] Furthermore, a convex ring is formed on the inner side of the outer ring mold body, and the convex ring is formed at the lower end of the outer ring mold body.

[0014] Furthermore, the vertical displacement drive device includes a platform, a column, a slider, and a vertical hydraulic cylinder. The column is installed on the platform, the vertical hydraulic cylinder is installed on the column, the slider vertically slides in cooperation with the column, the slider is also fixed to the pressure plate, and the output end of the vertical hydraulic cylinder is connected to the slider.

[0015] Furthermore, the disengagement assembly includes a support frame, a support column, a base plate and a horizontal hydraulic cylinder, the outer main mold body is rotatably mounted on the support frame, the support frame is mounted on the base plate through the support column, the base plate is slidably mounted on the platform, a horizontal hydraulic cylinder is mounted on the platform, and the output end of the horizontal hydraulic cylinder is connected to the base plate.

[0016] The beneficial effects of the present invention are:

[0017] When using a conventional mold, bubbles or impurities tend to float up, thus affecting the strength of the upper opening of the crucible. The present invention discloses a molding mold capable of improving the strength of the upper opening of a quartz crucible, wherein the mold is divided into two sections, wherein an inner ring mold body and an outer ring mold body located in the upper section are separated to form a surplus accommodating cavity. After the crucible is formed, the upper opening of the crucible can be cut off from the split position, thereby removing the opening portion with more impurities or bubbles, and forming a new upper opening near the cutting position, thereby ensuring the strength of the upper opening of the quartz crucible.

[0018] In the mold structure disclosed in the present invention, the excess accommodating cavity is formed by the inner ring mold body and the outer ring mold body being spaced and matched. Under the action of the clamping assembly, it can be applied to the mold forming processing operation of multiple groups of products, greatly reducing the design and manufacturing costs and ensuring the consistency of the products. The operation is simple and convenient, and it is easy to cut at the split position.

[0019] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art may be taught from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0021] Figure 1 It is a structural schematic diagram of the molding die of the present invention;

[0022] Figure 2 It is a schematic structural diagram of the planar displacement driving device of the present invention;

[0023] Figure 3 is the distribution diagram of the floating briquette;

[0024] Figure 4 is the distribution diagram of the guide rod;

[0025] Figure 5 for Figure 4 A cross-sectional view of

[0026] Figure 6 for Figure 5 Enlarged view at A.

[0027] The markings in the accompanying drawings are as follows: molding cavity 1, outer main mold body 2, outer ring mold body 3, inner main mold body 4, inner ring mold body 5, residual accommodating cavity 6, pressure plate 7, cylinder 8, support rod 9, connecting plate 10, floating pressure block 11, guide rod 12, through hole 13, elastic support device 14, rotating ring 15, gear 16, rack 17, motor 18, connecting part 19, injection port 20, support rod 21, telescopic device 22, positioning seat 23, pin shaft 24, convex ring 25, platform 26, column 27, slider 28, vertical hydraulic cylinder 29, support frame 30, support column 31, bottom plate 32, horizontal hydraulic cylinder 33, heating device 34. DETAILED DESCRIPTION

[0028] like Figures 1 to 6 As shown, the present invention discloses a molding die capable of improving the upper strength of a quartz crucible. The quartz crucible is a bowl-shaped structure with an opening facing upward. The molding die comprises an outer mold and an inner mold. A molding cavity 1 for the crucible is formed between the outer mold and the inner mold. Quartz sand raw material is loaded into the molding cavity 1 and the molding can be performed after melting. The above structure belongs to the prior art and should be understandable to those skilled in the art.

[0029] As an improvement of the embodiment of the present invention, the outer mold of the present invention includes two parts, namely, an outer main mold body 2 and an outer ring mold body 3 arranged at the mouth of the outer main mold body 2. The outer ring mold body 3 can be understood as extending outward along the generatrix from the opening of the outer main mold body 2. A sealing structure can be provided between the outer main mold body 2 and the outer ring mold body 3 to avoid overflow of the quartz sand raw material during molding, thereby ensuring product quality.

[0030] Similarly, the inner mold disclosed in the present invention includes an inner main mold body 4, an inner ring mold body 5 arranged at the bowl mouth of the inner main mold body 4, and the inner ring mold body 5 can be understood as being formed by extending outward along the generatrix from the opening of the inner main mold body 4. The inner ring mold body 5 is coaxially arranged on the inner side of the outer ring mold body 3, and the inner ring mold body 5 and the outer ring mold body 3 are connected with a clamping assembly, which is used to respectively clamp the inner ring mold body 5 and the outer ring mold body 3 to the outer main mold body 2 and the inner main mold body 4, so as to stabilize the crucible during molding.

[0031] The inner ring mold body 5 and the outer ring mold body 3 are separated to form a surplus accommodating cavity 6, which just corresponds to the upper surplus that needs to be cut; the outer main mold body 2 is also connected to a disengagement component, which controls the outer main mold body 2 and the inner main mold body 4 to separate from the outer ring mold body 3 and the inner ring mold body 5 respectively. By dividing the mold into two sections, wherein the inner ring mold body 5 and the outer ring mold body 3 located in the upper section are separated to form a surplus accommodating cavity 6, after the crucible is formed, the upper and lower parts are separated by the disengagement component, and the upper opening of the crucible can be cut off from the dividing position, thereby eliminating the opening surplus with more impurities or bubbles, and forming a new upper opening near the cutting position, thereby ensuring the upper opening strength of the quartz crucible. Of course, in order to ensure the smoothness of the product, the upper opening can be polished after cutting to meet actual production needs.

[0032] In this embodiment, the clamping assembly includes a pressing plate 7, a cylinder 8, a support rod 9, a connecting plate 10, and a vertical displacement driving device for driving the pressing plate 7 to move up and down. A connecting plate 10 is connected between the inner ring mold body 5 and the outer ring mold body 3. The inner ring mold body 5 and the outer ring mold body 3 are connected as a whole through the connecting plate 10 and can move together. The connecting plate 10 is installed on the upper side of the inner ring mold body 5 and the outer ring mold body 3 to avoid obstruction to the material. The upper side of the connecting rod is connected to the cylinder 8 through the support rod 9, and the cylinder 8 is fixed to the lower side of the pressing plate 7. In some other embodiments, the vertical displacement driving device directly uses a linear motor 18 to drive the pressing plate 7 to move up and down. After the pressing plate 7 moves up and down, it drives the inner ring mold body 5 and the outer ring mold body 3 to move up and down together through the support rod 9 and the connecting plate 10. When the inner ring mold body 5 and the outer ring mold body 3 move downward, they are assembled with the main mold body, thereby forming a complete mold for crucible molding.

[0033] In this embodiment, a plurality of floating pressure blocks 11 are arranged between the outer ring mold body 3 and the inner ring mold body 5. The floating pressure blocks 11 are arc-shaped, and the extension direction corresponds to the inclination direction of the main mold body generatrix. The floating pressure blocks 11 are evenly distributed in a ring shape along the circumference of the outer ring mold body 3, and the floating pressure blocks 11 can be installed floatingly on the upper side of the quartz raw material. The gap between two adjacent floating pressure blocks 11 is small, so that the floating pressure blocks 11 can have space to move up and down. A plurality of guide rods 12 corresponding to the floating pressure blocks 11 are distributed in a ring shape at the lower end of the cylinder 8, and the lower end of the guide rod 12 slides through the through hole 13 provided on the floating pressure block 11. An elastic support device 14 and a displacement sensor are installed between the floating pressure block 11 and the cylinder 8; a heating device 34 is arranged on the inner side of the inner ring mold body 5, and the heating device 34 is connected to a plane displacement driving device.

[0034] The displacement sensor of the present invention is used to detect the up and down movement of the floating pressure block 11. When the floating pressure block 11 has a large displacement space, it means that there are more bubbles at this location. Therefore, the controller needs to control the heating device 34 to move closer to this location so that the bubbles at this location can overflow quickly, thereby improving the overall quality of the quartz crucible.

[0035] In this embodiment, a circular hole is formed in the center of the pressing plate 7, and the opening of the circular hole is relatively large to ensure that the heating device 34 has sufficient displacement space. In some other embodiments, the plane displacement driving device can adopt the existing structure, and realize the plane displacement of the heating device 34 through the combination of transverse and longitudinal directions. Due to the high internal temperature, the device is prevented from penetrating into the mold as much as possible.

[0036] In the embodiment of the present invention, the plane displacement driving device includes a rotating ring 15, a gear 16, a rack 17, a motor 18 and a connecting portion 19. The rotating ring 15 is rotatably mounted on the inner wall of the circular hole, and the rotating ring 15 can rotate around a vertical straight line. The upper end of the heating device 34 is connected to the rack 17 through the connecting portion 19. The rack 17 extends along the radial direction of the rotating ring 15 and slides with the rotating ring 15. The rack 17 is meshed with the gear 16, and the gear 16 is driven to rotate by the motor 18 installed on the rotating ring 15. When the motor 18 rotates, it can drive the rack 17 to move along the radial direction. At this time, the rack 17 can drive the connecting portion 19 and the heating device 34 to move along the radial direction, thereby adjusting the radial position. When the circumferential position needs to be adjusted, the rotating ring 15 can be rotated. The rotation method can also be achieved by a rotation drive method. For example, a gear ring is set on the outer side of the rotating ring 15 to cooperate with another gear 16. It should be understood by those skilled in the art.

[0037] In this embodiment, one of the guide rods 12 is configured as a hollow rod, the lower end of which is connected to the molding cavity 1, and a material injection port 20 connected to the hollow rod is formed at the lower end of the cylinder 8. By providing the material injection port 20, it is convenient to feed the inner side of the molding cavity 1, so as to adjust the material situation at any time and ensure the quality of the product.

[0038] In this embodiment, a support rod 21 is connected to the pressing plate 7, and the support rod 21 extends along the radial direction of the cylinder 8. The inner end of the support rod 21 is connected to the positioning seat 23 through the telescopic device 22. The positioning seat 23 is used to position the position of the inner main mold body 4. By providing the positioning seat 23, the inner main mold body 4 can be positioned during molding, thereby ensuring product quality.

[0039] In this embodiment, the outer end of the support rod 21 is connected to a pin shaft 24, and the pin shaft 24 is rotatably matched with the pressure plate 7. The support rod 21 can rotate in a horizontal plane. By setting the pin shaft 24, the support rod 21 is hinged, which can give way to the connection part 19 to a certain extent.

[0040] In this embodiment, a convex ring 25 is formed on the inner side of the outer ring mold body 3, and the convex ring 25 is formed at the lower end of the outer ring mold body 3. By setting the convex ring 25, an annular indentation can appear at the crucible division position to facilitate the separation of the excess and make the end face of the subsequent upper mouth of the crucible more neat.

[0041] In this embodiment, the vertical displacement driving device includes a platform 26, a column 27, a slider 28, and a vertical hydraulic cylinder 29. The column 27 is mounted on the platform 26, the vertical hydraulic cylinder 29 is mounted on the column 27, the slider 28 vertically slides and fits the column 27, the slider 28 is fixed to the pressing plate 7 at the same time, and the output end of the vertical hydraulic cylinder 29 is connected to the slider 28. The disengagement assembly includes a support frame 30, a support column 31, a bottom plate 32, and a horizontal hydraulic cylinder 33. The outer main mold body 2 is rotatably mounted on the support frame 30, the support frame 30 is mounted on the bottom plate 32 through the support column 31, the bottom plate 32 is slidably mounted on the platform 26, and a horizontal hydraulic cylinder 33 is mounted on the platform 26, and the output end of the horizontal hydraulic cylinder 33 is connected to the bottom plate 32. It is convenient to adjust the position of the bottom plate 32 to achieve disengagement. The support frame 30 of the present invention is equipped with a variable speed motor 18 for controlling the rotation of the outer main mold body 2, so as to facilitate demoulding.

[0042] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A molding die capable of improving the upper strength of a quartz crucible, comprising an outer mold and an inner mold, wherein a molding cavity for the crucible is formed between the outer mold and the inner mold, characterized in that: The outer mold comprises an outer main mold body and an outer ring mold body arranged at the bowl mouth of the outer main mold body; the inner mold comprises an inner main mold body and an inner ring mold body arranged at the bowl mouth of the inner main mold body; the inner ring mold body is coaxially arranged on the inner side of the outer ring mold body; the inner ring mold body and the outer ring mold body are connected with a clamping assembly, and the clamping assembly is used to respectively clamp the inner ring mold body and the outer ring mold body to the outer main mold body and the inner main mold body, and a residual accommodating cavity is formed between the inner ring mold body and the outer ring mold body; the outer main mold body is also connected with a disengagement assembly, and the disengagement assembly controls the outer main mold body and the inner main mold body to disengage from the outer ring mold body and the inner ring mold body respectively.

2. A forming mold capable of improving the upper mouth strength of a quartz crucible according to claim 1, characterized in that: The clamping assembly includes a pressing plate, a cylinder, a support rod, a connecting plate, and a vertical displacement driving device for driving the pressing plate to move up and down. A connecting plate is connected between the inner ring mold body and the outer ring mold body. The upper side of the connecting rod is connected to the cylinder through the support rod, and the cylinder is fixed to the lower side of the pressing plate.

3. A forming mold capable of improving the upper mouth strength of a quartz crucible according to claim 2, characterized in that: A plurality of floating pressure blocks are arranged between the outer ring die body and the inner ring die body, and the floating pressure blocks are evenly distributed in an annular shape along the circumference of the outer ring die body. A plurality of guide rods corresponding to the floating pressure blocks are distributed in an annular shape at the lower end of the cylinder body, and the lower ends of the guide rods slide through the through holes provided on the floating pressure blocks. An elastic support device and a displacement sensor are installed between the floating pressure block and the cylinder body; a heating device is arranged on the inner side of the inner ring die body, and the heating device is connected to a planar displacement driving device.

4. A forming mold capable of improving the upper end strength of a quartz crucible according to claim 3, characterized in that: A circular hole is formed at the center of the pressure plate, and the planar displacement driving device includes a rotating ring, a gear, a rack, a motor and a connecting part. The rotating ring is rotatably installed on the inner wall of the circular hole, and the upper end of the heating device is connected to the rack through the connecting part. The rack extends along the radial direction of the rotating ring and slides with the rotating ring. The rack is meshed with the gear, and the gear is driven to rotate by the motor installed on the rotating ring.

5. A forming mold capable of improving the upper end strength of a quartz crucible according to claim 3, characterized in that: At least one guide rod is a hollow rod, the lower end of the hollow rod is communicated with the molding cavity, and the lower end of the cylinder is formed with an injection port communicated with the hollow rod.

6. A molding die capable of improving the upper end strength of a quartz crucible according to claim 2, characterized in that: The pressing plate is connected with a support rod, which extends along the radial direction of the cylinder. The inner end of the support rod is connected to a positioning seat through a telescopic device, and the positioning seat is used to position the position of the inner main mold body.

7. A forming mold capable of improving the upper end strength of a quartz crucible according to claim 6, characterized in that: The outer end of the support rod is connected with a pin shaft, and the pin shaft is rotatably matched with the pressure plate, so that the support rod can rotate in a horizontal plane.

8. The molding die capable of improving the upper end strength of a quartz crucible according to claim 1, characterized in that: A convex ring is formed on the inner side of the outer ring die body, and the convex ring is formed on the lower end of the outer ring die body.

9. A molding die capable of improving the upper end strength of a quartz crucible according to any one of claims 2 to 8, characterized in that: The vertical displacement driving device includes a platform, a column, a slider, and a vertical hydraulic cylinder. The column is installed on the platform, the vertical hydraulic cylinder is installed on the column, the slider vertically slides and fits in the column, the slider is also fixed to the pressure plate, and the output end of the vertical hydraulic cylinder is connected to the slider.

10. A forming mold capable of improving the upper end strength of a quartz crucible according to claim 9, characterized in that: The disengagement assembly includes a support frame, a support column, a base plate and a horizontal hydraulic cylinder. The outer main mold body is rotatably mounted on the support frame, the support frame is mounted on the base plate through the support column, the base plate is slidably mounted on the platform, a horizontal hydraulic cylinder is mounted on the platform, and the output end of the horizontal hydraulic cylinder is connected to the base plate.

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