A rapid sintering equipment for zirconium oxide

Abstract

This invention relates to the field of sintering technology and discloses a rapid sintering equipment for zirconia, comprising a machine body, a heating cylinder, three silicon carbide rods, a loading platform, and a material tray. A turntable is rotatably connected to the middle of the heat insulation plate of the heating cylinder. The silicon carbide rods are rotatably connected to the inner side of the turntable, and a transmission gear is sleeved at the end of each silicon carbide rod. A bidirectional threaded rod, rotatably connected to the loading platform, is coaxially fixed below the material tray, and a gear disk, rotatably connected to the bidirectional threaded rod, is driven by the bidirectional threaded rod. This design achieves positional changes in the silicon carbide rods by setting a planetary gear structure at their top ends, while the transmission gear at the bottom of the silicon carbide rods and the gear disk on the loading platform work together to drive the bidirectional threaded rod along the axis of the gear disk, enabling the material tray to reciprocate vertically. This improves the uniformity of heating of zirconia during sintering and enhances product quality.

Description

Technical Field

[0001] This invention relates to the field of sintering, and more particularly to a rapid sintering apparatus for zirconium oxide. Background Technology

[0002] Zirconia ceramics are white, turning yellow or gray when containing impurities. They generally contain HfO2, which is difficult to separate. Pure ZrO2 exists in three crystalline states under normal pressure: low-temperature monoclinic (m-ZrO2); medium-temperature tetragonal (t-ZrO2); and high-temperature cubic (c-ZrO2). These three crystal forms exist in different temperature ranges and exhibit the following interconversion relationships. Sintering is a crucial process in the preparation of zirconia ceramics, and the quality of sintering directly affects subsequent ceramic processing.

[0003] Since pure ceramic materials are sometimes difficult to sinter, sintering aids are usually introduced, where performance permits, to form a partial low-melting-point solid solution, glassy phase, or other liquid phase. This promotes particle rearrangement and viscous flow, resulting in a denser product and lowering the sintering temperature. Minimizing powder particle size is also a crucial measure to facilitate sintering. Finer powders have higher surface energy, making sintering easier. For ceramic materials and products with general performance requirements, pressureless sintering is the most convenient and economical method.

[0004] Existing small-area zirconia sintering is mostly carried out in small sintering furnaces. These furnaces control the furnace temperature via a control panel and typically consist of a control mechanism, a heating mechanism, and a loading mechanism. The preform to be sintered is placed in the loading mechanism and lifted into the heating chamber by a drive mechanism, where it is heated by silicon carbide rods. However, in existing sintering furnaces, the silicon carbide rods are mostly installed using a plug-in fixed method, and the loading platform below is also a fixed structure. This results in the side of the preform closest to the silicon carbide rod experiencing a higher temperature than other areas, leading to uneven sintering and inconsistent product quality, easily resulting in defective products. Therefore, this invention proposes a rapid zirconia sintering device to solve the above problems. Summary of the Invention

[0005] To address the problem of unsatisfactory sintering results due to the fixed position of silicon carbide rods in existing sintering furnaces, this invention provides a rapid zirconia sintering device.

[0006] The rapid sintering equipment for zirconia provided by this invention adopts the following technical solution:

[0007] A rapid zirconia sintering equipment includes a machine body. A heating cylinder is integrally formed at the front end of the machine body, and three silicon carbide rods for heating are arranged inside the heating cylinder. A loading platform and a material tray are movably arranged vertically below the heating cylinder on the machine body. A heat insulation plate is fixedly connected to the top of the heating cylinder, and a turntable is rotatably connected to the middle of the heat insulation plate. The silicon carbide rods are rotatably connected to the inside of the turntable, and the silicon carbide rods revolve around the turntable with the turntable. A transmission gear is sleeved at the end of the silicon carbide rod.

[0008] The material tray is coaxially fixedly connected to a bidirectional threaded rod that is rotatably connected to the loading platform, and a gear disk that is rotatably connected to the bidirectional threaded rod is driven on the loading platform.

[0009] When the gear disk and the transmission gear mesh, the transmission gear is axially displaced by the bidirectional threaded rod connected to the gear disk.

[0010] Preferably, a sun gear is rotatably connected to the center of the turntable, and planetary gears are fitted onto the tops of the three silicon carbide rods, with each planetary gear meshing and driving with the sun gear.

[0011] Preferably, a second motor is fixedly connected to the top of the heating cylinder by bolts, and the output end of the second motor is connected to the sun gear drive through a synchronous belt mechanism.

[0012] Preferably, the gear disk and the loading platform are vertically limited and radially rotated, and the diameter of the gear disk is larger than the diameter of the material tray. When the loading platform reaches its maximum stroke height, the gear disk and the transmission gear mesh.

[0013] Preferably, a conductive ring is provided above the planetary gear. The longitudinal section of the conductive ring is an inverted L-shaped structure. A first carbon ring is fixedly connected to the inner wall of the conductive ring, and a second carbon ring is fixedly connected to the top wall of the conductive ring.

[0014] Preferably, a first conductive sheet is fixedly connected to the top of the outer wall of each of the three silicon carbide rods, and the first conductive sheet and the first carbon ring are slidably attached together. A second conductive sheet is fixedly connected to the top of the silicon carbide rod, and the second conductive sheet and the second carbon ring are slidably attached together.

[0015] Preferably, two threaded rods are arranged in parallel inside the machine body, and a first motor is provided at the top of the threaded rods to synchronously drive the two threaded rods. A connecting plate is fixedly connected to the rear of the loading platform, and the connecting plate is slidably sleeved on the two threaded rods and threadedly connected to the threaded rods through the threaded sleeve.

[0016] In summary, the present invention has at least one of the following beneficial technical effects:

[0017] By setting a planetary gear structure at the top of the silicon carbide rod, the position of the silicon carbide rod can be changed. At the same time, a transmission gear is set at the bottom of the silicon carbide rod, and a gear disk is set on the loading platform. The two cooperate with each other to drive the bidirectional screw at the axis of the gear disk, realizing the reciprocating motion of the material tray in the vertical direction. Compared with the existing heating method with no stationary heating, the uniformity of zirconia heating during sintering is improved, thus improving the quality of the product. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the equiaxed structure of an embodiment of the invention.

[0019] Figure 2 This is a bottom-view isometric structural schematic diagram of an embodiment of the invention.

[0020] Figure 3 This is a partial cross-sectional structural schematic diagram of an embodiment of the invention.

[0021] Figure 4 This is a schematic diagram of the transmission mechanism structure according to an embodiment of the invention.

[0022] Figure 5 This is a cross-sectional structural diagram of an embodiment of the invention.

[0023] Figure 6 This is an isometric structural schematic diagram of the heating mechanism according to an embodiment of the invention.

[0024] Figure 7 This is an enlarged structural schematic diagram of point A in an embodiment of the invention.

[0025] Figure 8 This is an enlarged structural schematic diagram of section B in an embodiment of the invention.

[0026] Figure 9 This is an isometric structural diagram of the heating mechanism according to an embodiment of the invention, viewed from below.

[0027] Figure 10 This is a schematic diagram of the feeding mechanism structure according to an embodiment of the invention.

[0028] Figure 11 This is a schematic diagram of the material tray structure according to an embodiment of the invention.

[0029] Explanation of reference numerals in the attached drawings: 1. Machine body; 2. Heating cylinder; 201. Through groove; 202. Heat insulation plate; 3. Material tray; 4. Loading platform; 5. Gear disk; 6. Connecting plate; 7. Turntable; 8. Conductive ring; 801. First carbon ring; 802. Second carbon ring; 9. Silicon carbide rod; 10. Transmission gear; 11. First motor; 12. Threaded rod; 13. Bidirectional threaded rod; 14. Second motor; 15. Synchronous belt mechanism; 16. Sun gear; 17. Planetary gear; 18. First conductive plate; 19. Second conductive plate. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-11 The present invention will be described in further detail below.

[0031] Example 1:

[0032] Reference Figure 1-11 A rapid zirconia sintering device includes a body 1. A heating cylinder 2 is integrally formed at the front end of the body 1, and three silicon carbide rods 9 are installed inside the heating cylinder 2 for heating. The silicon carbide rods 9 are connected to an external control mechanism, which sets the heating curve of the silicon carbide rods 9 to better meet the sintering requirements of zirconia. A through groove 201 corresponding to a loading platform 4 and a connecting plate 6 is provided at the bottom of the heating cylinder 2. The loading platform 4 and a material tray 3 are vertically movable below the heating cylinder 2 on the body 1. Two threaded rods 12 are arranged in parallel, and a first motor 11 that synchronously drives the two threaded rods 12 is provided at the top of the threaded rods 12. A connecting plate 6 is fixedly connected to the rear of the loading platform 4, and the connecting plate 6 is slidably sleeved on the two threaded rods 12. The connecting plate 6 is threadedly connected to the threaded rods 12 through the threaded sleeve. When the two threaded rods 12 rotate, the connecting plate 6 is moved vertically under the action of the threaded sleeve, thereby realizing the control of the height of the loading platform 4. The first motor 11 drives one of the two threaded rods 12 to rotate through the synchronous belt, and the two threaded rods 12 are connected by the synchronous belt.

[0033] A heat insulation plate 202 is fixedly connected to the top of the heating cylinder 2, and a turntable 7 is rotatably connected to the middle position of the heat insulation plate 202. A silicon carbide rod 9 is rotatably connected to the inner side of the turntable 7, and the silicon carbide rod 9 revolves around the turntable 7. A transmission gear 10 is sleeved on the end of the silicon carbide rod 9. A sun gear 16 is rotatably connected to the center of the turntable 7. The shaft of the sun gear 16 is fixedly connected to the outer wall of the conductive ring 8 through a connector to ensure the stability of the axial position of the sun gear 16. Planetary gears 17 are sleeved on the tops of the three silicon carbide rods 9, and each planetary gear 17 is connected to the sun gear 8. The sun gear 16 is engaged in a transmission connection. The top of the heating cylinder 2 is bolted to the inside of the second motor 14. The output end of the second motor 14 is connected to the sun gear 16 through a synchronous belt mechanism 15. The synchronous belt mechanism 15 includes two gears and a synchronous belt. The two gears are fixedly connected to the sun gear 16 and the output shaft of the second motor 14, respectively, so that the second motor 14 can drive the sun gear 16. The synchronous belt mechanism 15 can also adopt other forms of gear matching, and ultimately achieve the transmission effect of the second motor 14 to the sun gear 16.

[0034] A bidirectional threaded rod 13, which is rotatably connected to the loading platform 4, is coaxially fixedly connected below the material tray 3, and a gear disk 5, which is rotatably connected to the bidirectional threaded rod 13, is driven by the loading platform 4.

[0035] When the gear disk 5 and the transmission gear 10 mesh, the transmission gear 10 is axially displaced by the bidirectional threaded rod 13 connected to the gear disk 5. The loading platform 4 is provided with a plug rod, which is slidably embedded in the axis of the bidirectional threaded rod 13 to limit the radial movement of the bidirectional threaded rod 13. The gear disk 5 and the loading platform 4 are vertically limited and rotate radially. The diameter of the gear disk 5 is larger than the diameter of the material tray 3. When the loading platform 4 reaches the maximum stroke height, the gear disk 5 and the transmission gear 10 mesh. The teeth on the outer walls of the gear disk 5 and the transmission gear 10 are all turned inward on the opposite side to increase the gap area between the two ends and improve the convenience of plugging in the gear disk 5 and the transmission gear 10. This avoids the loading platform 4 from not being able to fit and seal with the through groove 201 due to poor docking.

[0036] When the loading platform 4 and the through slot 201 are sealed, the second motor 14 rotates and drives the sun gear 16 through the synchronous belt mechanism 15. When the sun gear 16 rotates, the transmission planetary gear 17 rotates. The planetary gear 17 rotates around the sun gear 16 while rotating on its own axis, thereby achieving a deceleration effect. The silicon carbide rod 9 moves synchronously with the planetary gear 17 and drives the gear disk 5 through the transmission gear 10. Under its action, the gear disk 5 rotates around the axis. At this time, due to the radial limit of the threaded rod 12, the threaded rod 12 will be displaced along the axial direction. When the position of the top of the threaded rod 12 changes, the vertical position of the material tray 3 also changes, thereby changing the vertical position of the material tray 3 in the heating cylinder 2, so that the zirconium oxide in the material tray 3 is heated more evenly and the sintering effect is improved.

[0037] A conductive ring 8 is positioned above the planetary gear 17. The longitudinal section of the conductive ring 8 is an inverted L-shaped structure. A first carbon ring 801 is fixedly connected to the inner wall of the conductive ring 8, and a second carbon ring 802 is fixedly connected to the top wall of the conductive ring 8. Both the first carbon ring 801 and the second carbon ring 802 protrude from the conductive ring 8, and are respectively connected to the positive and negative terminals of the direct current. The body of the conductive ring 8 is made of insulating material. The outer side of the conductive ring 8 is connected to the inner wall of the heating cylinder 2 via three connecting brackets in a ring array. The three silicon carbide rods 9 are fixedly connected, with a first conductive sheet 18 fixedly connected to the top of each outer wall. The first conductive sheet 18 and the first carbon ring 801 are slidably attached to each other. A second conductive sheet 19 is fixedly connected to the top of each silicon carbide rod 9. The second conductive sheet 19 and the second carbon ring 802 are slidably attached to each other. The first conductive sheet 18 and the second conductive sheet 19 are elastically connected to the top of each silicon carbide rod 9. Their elasticity ensures good contact between them and the carbon ring. The carbon ring can reduce the friction between them to a certain extent.

[0038] It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rapid zirconia sintering device, comprising a body (1), wherein a heating cylinder (2) is integrally formed at the front end of the body (1), and three silicon carbide rods (9) for heating are arranged inside the heating cylinder (2); a loading platform (4) and a material tray (3) are movably arranged vertically below the heating cylinder (2) of the body (1), characterized in that: The top of the heating cylinder (2) is fixedly connected to a heat insulation plate (202), and a turntable (7) is rotatably connected to the middle position of the heat insulation plate (202). The silicon carbide rod (9) is rotatably connected to the inside of the turntable (7), and the silicon carbide rod (9) revolves around the turntable (7) with the turntable (7). A transmission gear (10) is sleeved at the end of the silicon carbide rod (9). The material tray (3) is coaxially fixedly connected to a bidirectional threaded rod (13) that is rotatably connected to the loading platform (4), and a gear disk (5) that is rotatably connected to the loading platform (4) and is driven by the bidirectional threaded rod (13); When the gear disk (5) and the transmission gear (10) mesh, the transmission gear (10) is axially displaced by the bidirectional threaded rod (13) transmitted through the gear disk (5); The turntable (7) is rotatably connected to a sun gear (16) at its center, and planet gears (17) are fitted on the top of the three silicon carbide rods (9). The planet gears (17) are all meshed with the sun gear (16) for transmission.

2. The rapid sintering equipment for zirconium oxide according to claim 1, characterized in that: The top of the heating cylinder (2) is bolted to a second motor (14), and the output end of the second motor (14) is connected to the sun gear (16) via a synchronous belt mechanism (15).

3. The rapid sintering equipment for zirconia according to claim 1, characterized in that: The gear disk (5) and the loading platform (4) are vertically limited and radially rotated. The diameter of the gear disk (5) is larger than the diameter of the material tray (3). When the loading platform (4) reaches the maximum stroke height, the gear disk (5) and the transmission gear (10) mesh.

4. The rapid sintering equipment for zirconium oxide according to claim 2, characterized in that: A conductive ring (8) is provided above the planetary gear (17). The longitudinal section of the conductive ring (8) is an inverted L-shaped structure. A first carbon ring (801) is fixedly connected to the inner wall of the conductive ring (8), and a second carbon ring (802) is fixedly connected to the top wall of the conductive ring (8).

5. The rapid sintering equipment for zirconium oxide according to claim 4, characterized in that: The top of the outer wall of each of the three silicon carbide rods (9) is fixedly connected to a first conductive sheet (18), and the first conductive sheet (18) and the first carbon ring (801) are slidably attached together. The top of the silicon carbide rod (9) is fixedly connected to a second conductive sheet (19), and the second conductive sheet (19) and the second carbon ring (802) are slidably attached together.

6. The rapid sintering equipment for zirconium oxide according to claim 1, characterized in that: The machine body (1) has two threaded rods (12) arranged in parallel inside, and the top of the threaded rods (12) is provided with a first motor (11) that synchronously drives the two threaded rods (12). A connecting plate (6) is fixedly connected to the rear of the loading platform (4), and the connecting plate (6) slides on the two threaded rods (12) and is threadedly connected to the threaded rods (12) through the threaded sleeve.

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