Graphite riser convenient for heat preservation and used for casting fused brick
By setting sealing and venting components at the top of the graphite riser, the thermal expansion characteristics of the material are utilized to achieve sealing and venting, solving the problem of heat loss during the electrofused brick casting process and improving the quality and yield of castings.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHENGZHOU YUANDONG REFRACTORY CO LTD
- Filing Date
- 2025-04-16
- Publication Date
- 2026-04-28
AI Technical Summary
In traditional electrofused brick casting, risers are prone to gaps at the joints under high-temperature conditions, leading to heat loss, ineffective feeding, and affecting casting quality and yield.
A graphite riser is used to set a sealing component and an venting component at the top, including an alloy push rod, a push plate and a baffle. The sealing and venting functions are achieved by utilizing the thermal expansion characteristics of the material, and an insulation layer is combined to reduce heat loss.
A tight seal between the graphite riser and the top cover is achieved in a high-temperature environment, reducing heat loss, ensuring stable internal temperature of the casting, preventing shrinkage cavities and porosity, and improving casting quality and yield.
Smart Images
Figure CN224170080U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of riser technology, and in particular to a graphite riser for electrofused brick casting that is easy to keep warm. Background Technology
[0002] Electrofused bricks are refractory materials made by melting raw materials such as bauxite and industrial alumina at high temperatures in an electric furnace and then recrystallizing them. During the solidification process, the molten metal shrinks due to the decrease in temperature. Riseres store additional molten metal, which is replenished in time when the electrofused bricks solidify and shrink, preventing the formation of defects such as shrinkage cavities and porosity inside the bricks, thus ensuring the density and quality of the bricks. Without risers to compensate for shrinkage, these internal defects would weaken the structural strength of the electrofused bricks, making them prone to cracking and accelerated erosion under harsh conditions such as high temperature and high pressure in kilns, thus shortening their service life.
[0003] Traditional risers for electrofused brick casting have significant shortcomings in terms of heat preservation. Most risers have simple sealing structures, relying solely on a simple bonding method between the top cover and the graphite riser. In the high-temperature environment of electrofused brick casting, gaps easily appear at the connection point, leading to substantial heat loss. This not only causes the temperature of the molten metal inside the riser to drop too quickly, failing to provide continuous and effective feeding for the casting, but also results in defects such as shrinkage cavities and porosity within the casting, severely impacting casting quality and yield. Therefore, a graphite riser for electrofused brick casting with improved heat preservation is proposed. Utility Model Content
[0004] To overcome the above deficiencies, this utility model provides a graphite riser for electrofused brick casting that facilitates heat preservation, aiming to improve the problem in the prior art where gaps easily appear at the joints in the high-temperature environment of electrofused brick casting, resulting in a large amount of heat loss.
[0005] To achieve the above objectives, the present invention adopts the following technical solution: a graphite riser for casting electrofused bricks that is easy to keep warm, comprising a graphite riser, a top cover provided on the top of the graphite riser, three vent holes provided on the top of the top cover, a sealing component provided on the inner wall of the top cover, and a venting component provided inside the top cover.
[0006] The sealing assembly includes four alloy push rods, the outer walls of which are slidably connected to the inside of the top cover, and sealing rings are fixedly connected to the sides of the four alloy push rods that are far apart from each other.
[0007] As a further description of the above technical solution:
[0008] The exhaust assembly includes multiple push plates, which are installed on the inner wall of the top cover. A connecting rod is fixedly connected to the outer wall of the top cover, and a baffle is fixedly connected to the side of the connecting rod away from the push plate.
[0009] As a further description of the above technical solution:
[0010] The inner wall of the top cover has a groove, the width of which is greater than the top edge of the graphite riser.
[0011] As a further description of the above technical solution:
[0012] The graphite riser is filled with an insulation layer.
[0013] As a further description of the above technical solution:
[0014] The coefficient of thermal expansion of the alloy push rod is higher than that of the graphite riser.
[0015] As a further description of the above technical solution:
[0016] The expansion coefficient of the push plate is greater than that of the baffle plate.
[0017] As a further description of the above technical solution:
[0018] The area of the baffle is larger than the diameter of the top cover.
[0019] This utility model has the following beneficial effects:
[0020] 1. In this utility model, a tight seal is achieved between the top cover and the graphite riser through a sealing assembly. Under the high-temperature environment of electrofused brick casting, the alloy push rod expands more significantly, which can powerfully push the sealing ring to fit tightly against the inner wall of the graphite riser, greatly reducing heat loss from the connection between the top cover and the graphite riser.
[0021] 2. In this utility model, the push plate is connected to the baffle plate via a connecting rod, which can accurately transmit the displacement generated by expansion to the baffle plate. When the internal temperature of the graphite riser is high and the gas pressure increases, the vent is opened to release the internal hot gas. When the temperature drops, the vent is closed to prevent cold air from entering and maintain a high-temperature stable environment inside the riser. Attached Figure Description
[0022] Figure 1 A perspective view of a graphite riser for casting electrofused bricks that facilitates heat preservation, as proposed in this utility model.
[0023] Figure 2 This is a schematic diagram of the groove of a graphite riser for casting electrofused bricks that facilitates heat preservation, as proposed in this utility model.
[0024] Figure 3 A schematic diagram of an alloy push rod for a graphite riser used in the casting of electrofused bricks, which is easy to keep warm, according to this utility model.
[0025] Figure 4This is a schematic diagram of a graphite riser baffle for electrofused brick casting that facilitates heat preservation, as proposed in this utility model.
[0026] Legend:
[0027] 1. Graphite riser; 2. Top cover; 3. Vent hole; 4. Groove; 5. Alloy push rod; 6. Sealing ring; 7. Push plate; 8. Connecting rod; 9. Baffle plate. Detailed Implementation
[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.
[0029] Reference Figures 1-3 This utility model provides an embodiment of a graphite riser for casting electrofused bricks that facilitates heat preservation. The riser includes a graphite riser 1, which stores molten metal during the casting process and simultaneously feeds the casting to ensure its quality. A top cover 2 is provided on the top of the graphite riser 1 to seal it, creating a closed space inside and preventing heat loss. Three vent holes 3 are provided on the top of the top cover 2 to discharge gases generated during the casting process. A sealing component is provided on the inner wall of the top cover 2 to seal the connection between the graphite riser 1 and the top cover 2, preventing heat loss at the joint. An exhaust component is provided inside the top cover 2 to assist the exhaust holes 3 in better discharging gases generated during the casting process.
[0030] Reference Figure 2 and Figure 3 The sealing assembly includes four alloy push rods 5. The outer wall of the alloy push rods 5 is slidably connected to the inside of the top cover 2. The alloy push rods 5 are used to fix the sealing rings 6 and drive the sealing rings 6 to slide through their own sliding. The sealing rings 6 are fixedly connected to the sides of the four alloy push rods 5 that are far apart. The sealing rings 6 can fit into the connection between the graphite riser 1 and the top cover 2, further enhancing the sealing effect.
[0031] Reference Figure 4 The venting assembly includes multiple push plates 7, which are installed on the inner wall of the top cover 2. The push plates 7 are made of thermally expandable material, which will expand during casting, thereby driving other components to slide. A connecting rod 8 is fixedly connected to the outer wall of the top cover 2. The connecting rod 8 is used to connect the push plates 7 and the baffles 9, and transmit the movement of the push plates 7 to the baffles 9, thereby driving the baffles 9 to slide. A baffle 9 is fixedly connected to the side of the connecting rod 8 away from the push plates 7. The baffle 9 is used to open the vent hole 3 to vent when the temperature of the molten metal inside the graphite riser 1 is high, and to close the vent hole 3 when the temperature of the molten metal inside the graphite riser 1 is too low, thereby reducing convective heat dissipation.
[0032] Reference Figure 2 and Figure 3 The inner wall of the top cover 2 is provided with a groove 4. The width of the groove 4 is greater than the top edge of the graphite riser 1. The groove 4 allows the graphite riser 1 to be completely embedded in the inner wall of the top cover 2, thereby increasing the sealing between the graphite riser 1 and the top cover 2. At the same time, the width of the groove 4 is greater than the edge of the graphite riser 1, so that when the graphite riser 1 expands, the graphite riser 1 and the top cover 2 can be further fitted together.
[0033] Reference Figure 1 The graphite riser 1 is made of graphite, which has good high temperature resistance and can withstand the high temperature environment during the electrofused brick casting process without deformation or damage. The graphite riser 1 is filled with an insulation layer, which can further prevent heat loss and help maintain the high temperature inside the graphite riser 1.
[0034] Reference Figure 3 The coefficient of thermal expansion of the alloy push rod 5 is higher than that of the graphite riser 1. The alloy push rod 5 is made of nickel-based high-temperature alloy and is cast in fused brick. Because the coefficient of thermal expansion of the alloy push rod 5 is higher than that of graphite, the stroke by which the alloy push rod 5 pushes the sealing ring 6 to slide is greater than the stroke by which the graphite itself expands. Therefore, the sealing ring 6 can fit tightly against the inner wall of the graphite riser 1, thereby further enhancing the sealing effect and reducing heat loss from the connection between the top cover 2 and the graphite riser 1.
[0035] Reference Figure 4 The expansion coefficient of the push plate 7 is greater than that of the baffle 9. The push plate 7 is made of copper. Copper will expand due to the high temperature of the molten metal during the pouring process, which will push the connecting rod 8 to slide, and further drive the baffle 9 to slide. The baffle 9 is made of ceramic. Ceramic has a low expansion coefficient. It will not expand due to the high temperature of the pouring process, which will make it difficult to open the vent hole 3.
[0036] Reference Figures 2-3 The area of the baffle 9 is larger than the diameter of the top cover 2, ensuring that the baffle 9 can effectively seal the exhaust hole 3 during the sealing process, and at the same time, effectively prevent foreign objects from entering the exhaust hole 3.
[0037] Working principle: When graphite riser 1 is needed to replenish the cast electrofused bricks, the top cover 2 is opened and molten metal is injected into the graphite riser 1. After the molten metal is injected, it will flow into the mold through the graphite riser 1. After the molten metal is injected, the top cover 2 and the graphite riser 1 are closed. At this time, the inner wall of the top cover 2 will engage with the outer wall of the graphite riser 1. At the same time, the sealing ring 6 in the inner wall of the top cover 2 will engage with the inside of the graphite riser 1. The alloy push rod 5 and the push plate 7 inside the top cover 2 will expand due to their own material and the high temperature of the solution. When the alloy push rod 5 expands, it will push the sealing ring 6 to slide, so that the sealing ring 6 is further fitted with the inner wall of the graphite riser 1, thereby increasing the sealing between the graphite riser 1 and the top cover 2 and reducing heat loss.
[0038] When the push plate 7 expands due to heat, it drives the connecting rod 8 to slide, and the connecting rod 8 drives the baffle 9 to slide. When the baffle 9 slides, it releases the sealing effect on the vent hole 3. At this time, the vent hole 3 is in the open state, and the hot air inside the graphite riser 1 will be discharged through the vent hole 3. When the temperature inside the graphite riser 1 gradually cools down, the sealing ring 6 will return to its initial state. At this time, the baffle 9 will also return to its initial position, thereby sealing the vent hole 3 and preventing foreign matter from entering the interior of the graphite riser 1 through the vent hole 3.
Claims
1. A graphite riser for casting electrofused bricks that facilitates heat insulation, comprising a graphite riser (1), characterized in that: The graphite riser (1) is provided with a top cover (2), the top cover (2) has three vent holes (3) on the top, the inner wall of the top cover (2) is provided with a sealing component, and the inside of the top cover (2) is provided with a venting component; The sealing assembly includes four alloy push rods (5), the outer walls of which are slidably connected to the inside of the top cover (2), and sealing rings (6) are fixedly connected to the sides of the four alloy push rods (5) that are far apart from each other.
2. The graphite riser for electrofused brick casting that facilitates heat insulation according to claim 1, characterized in that: The exhaust assembly includes multiple push plates (7), which are installed on the inner wall of the top cover (2). A connecting rod (8) is fixedly connected to the outer wall of the top cover (2), and a baffle (9) is fixedly connected to the side of the connecting rod (8) away from the push plate (7).
3. A graphite riser for casting electrofused bricks that facilitates heat insulation, as described in claim 2, is characterized in that: The inner wall of the top cover (2) is provided with a groove (4), the width of which is greater than the top edge of the graphite riser (1).
4. A graphite riser for casting electrofused bricks that facilitates heat insulation, as described in claim 2, characterized in that: The graphite riser (1) is filled with an insulation layer.
5. A graphite riser for casting electrofused bricks that facilitates heat insulation, as described in claim 2, characterized in that: The coefficient of expansion of the alloy push rod (5) is higher than that of the graphite riser (1).
6. A graphite riser for casting electrofused bricks that facilitates heat insulation, as described in claim 2, characterized in that: The expansion coefficient of the push plate (7) is greater than that of the baffle plate (9).
7. A graphite riser for casting electrofused bricks that facilitates heat insulation, as described in claim 2, characterized in that: The area of the baffle (9) is larger than the diameter of the top cover (2).