Transition pipe and low-pressure casting equipment

Abstract

The utility model belongs to the technical field of low-pressure casting, and discloses a transition pipe and low-pressure casting equipment. The transition pipe comprises an outer cylinder, an inner cylinder and a heat preservation layer, the outer cylinder is used for being connected with a furnace cover of the pouring furnace, the inner cylinder is coaxially arranged in the outer cylinder in a penetrating mode and used for being communicated with a liquid rising pipe in the pouring furnace, and the heat preservation layer is arranged between the outer circumferential wall of the inner cylinder and the inner circumferential wall of the outer cylinder in a clamped mode. According to the transition pipe and the low-pressure casting equipment, loss of heat of liquid metal can be effectively reduced, the situation that the liquid metal is solidified in advance to block the transition pipe due to the fact that the temperature of the liquid metal in the transition pipe is reduced too fast is avoided, waste of liquid metal resources is avoided, the reject ratio of castings is reduced, and the production cost is reduced. And meanwhile, the whole casting process is simplified, and the casting efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-pressure casting, in particular to a transition pipe and low-pressure casting equipment. Background Art

[0002] Low-pressure casting is a casting process in which liquid metal fills the mold cavity under pressure to form a casting. When casting complex molds, a transition tube is typically designed outside the pouring furnace to connect to the riser tube inside the furnace. Because the transition tube is exposed to the external environment and lacks additional auxiliary heating, low-pressure casting can cause the liquid metal to lose temperature rapidly during the rise process, causing it to solidify prematurely in the transition tube. This can lead to pouring anomalies and increased subsequent cleanup work. It can also cause under-casting of the casting, resulting in a high rate of defective castings or even scrapping of the casting.

[0003] In the prior art, the transition tube is usually configured as a detachable inner tube and outer tube, and a refractory coating is applied to the inner wall of the inner tube. The defective rate of the casting is reduced by replacing the preheated inner tube. However, this still causes the temperature of the liquid metal to lose, which in turn causes the liquid metal to solidify prematurely and clog the transition tube, resulting in lower casting quality, waste of energy, and a complicated casting process. Utility Model Content

[0004] The first purpose of the present utility model is to provide a transition tube that can effectively reduce the loss of heat from liquid metal, avoid the situation where the liquid metal solidifies prematurely and blocks the transition tube due to the rapid decrease in the temperature of the liquid metal in the transition tube, avoid the waste of liquid metal resources, reduce the defective rate of castings, improve the quality of castings, and at the same time simplify the entire casting process and improve casting efficiency.

[0005] The second purpose of the present invention is to provide a low-pressure casting device to simplify the casting process and improve casting efficiency and product quality.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] Transition pipe, including:

[0008] The outer cylinder is used to connect with the furnace cover of the pouring furnace;

[0009] an inner cylinder coaxially disposed inside the outer cylinder and configured to communicate with a riser pipe inside the casting furnace; and

[0010] The heat-insulating layer is sandwiched between the outer peripheral wall of the inner tube and the inner peripheral wall of the outer tube.

[0011] Preferably, the transition duct further comprises:

[0012] The fixing piece is inserted into the thermal insulation layer to squeeze and fix the thermal insulation layer.

[0013] Preferably, the outer cylinder comprises:

[0014] An outer cylinder body, the outer cylinder body being coaxially sleeved on the outside of the inner cylinder;

[0015] At least one partition extends along the axial direction of the outer cylinder body, the partition is fixedly connected to the inner wall of the outer cylinder body, and extends toward the outer wall of the inner cylinder along the radial direction of the outer cylinder body, and the insulation layer is filled between the outer circumferential wall of the inner cylinder, the inner circumferential wall of the outer cylinder and the partition.

[0016] Preferably, the partition is provided with a fixing hole, and the fixing hole is filled with the thermal insulation layer.

[0017] Preferably, the outer cylinder further comprises:

[0018] The mounting seat is arranged at the first end of the outer cylinder body and is fixedly connected to the outer cylinder body. The mounting seat is detachably connected to the furnace cover of the pouring furnace.

[0019] Preferably, the thermal insulation layer is made of powder material, and the powder material can be solidified by heating.

[0020] Preferably, a groove is provided on one of the first end of the outer tube and the first end of the inner tube, and a boss is provided on the other one, and the boss can be fixedly engaged with the groove.

[0021] Preferably, a sealing material is filled between the groove and the boss.

[0022] Preferably, the transition duct further comprises:

[0023] A cover plate is fixedly connected to the end of the outer tube, and the end of the outer tube and the end of the thermal insulation layer are both covered with the cover plate.

[0024] Low-pressure casting equipment comprises a pouring furnace and the transition pipe described above, wherein the transition pipe is detachably connected to the pouring furnace.

[0025] Beneficial effects of the utility model:

[0026] The utility model provides a transition tube comprising an outer tube, an inner tube, and an insulation layer. The outer tube is connected to the furnace cover of a casting furnace, and the inner tube is coaxially disposed within the outer tube and communicates with a riser pipe within the casting furnace. The insulation layer is sandwiched between the outer circumferential wall of the inner tube and the inner circumferential wall of the outer tube. By sandwiching the insulation layer between the outer circumferential wall of the inner tube and the inner circumferential wall of the outer tube, the insulation effect of the transition tube is improved. When liquid metal flows through the transition tube from the riser pipe, heat loss from the liquid metal is effectively reduced, preventing premature solidification of the liquid metal in the transition tube and clogging the transition tube due to a rapid decrease in liquid metal temperature. This avoids waste of liquid metal resources, reduces the defective rate of castings, and improves casting quality. Furthermore, by sandwiching the insulation layer between the outer circumferential wall of the inner tube and the inner circumferential wall of the outer tube, the inner tube does not need to be preheated within the outer tube, simplifying the entire casting process and improving casting efficiency.

[0027] The utility model also provides a low-pressure casting device. By applying the above-mentioned transition tube, the low-pressure casting device does not need to replace the preheated inner cylinder in the outer cylinder before and after casting, so that the casting process is simple, thereby improving casting efficiency and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is an exploded view of a transition duct provided by an embodiment of the present utility model;

[0029] Figure 2 This is a first cross-sectional view of a transition duct provided by an embodiment of the present utility model;

[0030] Figure 3 This is a second cross-sectional view of the transition duct provided in an embodiment of the present utility model.

[0031] In the picture:

[0032] 1. Outer tube; 11. Outer tube body; 12. Separator; 121. Fixing hole; 13. Mounting seat; 14. Groove; 2. Inner tube; 21. Boss; 3. Cover plate; 4. Fixing piece; 5. Insulation layer. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0034] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0035] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0037] like Figure 1 As shown, this embodiment provides a transition tube comprising an outer tube 1, an inner tube 2, and an insulation layer 5. The outer tube 1 is configured to connect to the furnace cover of a pouring furnace, while the inner tube 2 is coaxially disposed within the outer tube 1 and communicates with a riser pipe within the pouring furnace. The insulation layer 5 is sandwiched between the outer circumferential wall of the inner tube 2 and the inner circumferential wall of the outer tube 1. By sandwiching the insulation layer 5 between the outer circumferential wall of the inner tube 2 and the inner circumferential wall of the outer tube 1, the insulation effect of the transition tube is improved. When liquid metal from the riser pipe flows through the transition tube, heat loss from the liquid metal is effectively reduced, preventing premature solidification and clogging of the transition tube due to a rapid drop in liquid metal temperature. This also avoids waste of liquid metal resources, reduces the defective rate of castings, and improves casting quality. Furthermore, by sandwiching a thermal insulation layer 5 between the outer circumferential wall of the inner tube 2 and the inner circumferential wall of the outer tube 1, there is no need to replace the preheated inner tube 2 within the outer tube 1, thus simplifying the entire casting process and improving casting efficiency. Optionally, in this embodiment, the outer tube 1 is detachably connected to the furnace cover of the casting furnace by bolts.

[0038] Optionally, in this embodiment, a transition tube is used for low-pressure casting of aluminum alloys. Specifically, liquid aluminum alloy is contained within a casting furnace and passed through a riser pipe within the casting furnace to a transition tube located outside the casting furnace. The transition tube then passes the liquid aluminum alloy into a mold to complete the low-pressure casting of the aluminum alloy. It should be noted that by using this transition tube to pass the liquid aluminum alloy, the operating temperature of the transition tube is always higher than the solidification temperature of the aluminum alloy, preventing the liquid aluminum alloy from prematurely solidifying and adhering to the inner wall of the inner tube 2, thereby improving the efficiency of the low-pressure casting.

[0039] Alternatively, as Figure 2 As shown, in this embodiment, the length of the inner tube 2 is greater than that of the outer tube 1. When the inner tube 2 is inserted into the outer tube 1, the end of the inner tube 2 extends outward from the end of the outer tube 1. This arrangement, on the one hand, facilitates connection between the end of the inner tube 2 extending outward from the outer tube 1 and the casting mold. On the other hand, it prevents liquid aluminum alloy from flowing into the insulation layer 5 during the casting process, thereby causing the molten aluminum to carry impurities and reduce the quality of the casting. In other embodiments, when the inner tube 2 is inserted into the outer tube 1, the length of the inner tube 2 is equal to the length of the outer tube 1.

[0040] Optionally, in this embodiment, the inner barrel 2 is made of aluminum titanate. Aluminum titanate offers advantages such as excellent stability and corrosion resistance, preventing corrosion and reaction with circulating liquid aluminum alloy. Furthermore, aluminum titanate is heat-resistant and well-suited to oxidation issues at high temperatures. This increases the continuity of the low-pressure casting process, improves production efficiency, and reduces production costs. In other embodiments, the inner barrel 2 can also be made of stainless steel, silicon nitride, or the like.

[0041] Furthermore, the insulation layer 5 is a powdered material that solidifies upon heating. The powdered material completely fills the space between the outer tube 1 and the inner tube 2, ensuring the integrity of the insulation layer 5. Furthermore, when the powdered material is heated, a solidification reaction occurs between the powders, gradually bonding and fusing the loose powders together to form a solid and stable structure. The solidified insulation layer 5 significantly improves the thermal insulation performance of the transition duct, firmly locking heat within the duct.

[0042] Optionally, in this embodiment, the insulation layer 5 is an amorphous refractory material, such as a siliceous refractory material, a high-alumina refractory material, a clay refractory material, or a combination of any two thereof. In this embodiment, a high-alumina refractory material is preferably used, which has better insulation performance.

[0043] Alternatively, as Figure 1-Figure 3As shown, the transition pipe also includes a fixing member 4, which is inserted into the insulation layer 5 to squeeze and fix the insulation layer 5. Under the action of squeezing, the insulation layer 5 is gradually compacted inside, which increases the bonding force between the insulation layers 5. After the insulation layer 5 is heated and solidified, it expands, causing the fixing member 4 to further squeeze the insulation layer 5, so that the insulation layer 5 fits tightly to the fixing member 4, the outer tube 1 and the inner tube 2. This avoids shaking of the insulation layer 5 due to external forces or other factors during the casting process, greatly enhances the stability of the insulation layer 5, and enables it to better play the role of thermal insulation between the outer tube 1 and the inner tube 2, so as to ensure that the transition pipe can always maintain good thermal insulation effect and structural integrity during long-term use. It should be noted that there are multiple fixing members 4, and the length of the fixing member 4 is not limited. The fixing member 4 can be inserted into the middle position of the insulation layer 5 or into the bottom of the insulation layer 5, and there is no restriction here.

[0044] Optionally, in this embodiment, the fixing member 4 is in the form of a steel nail, which can better insert the fixing member 4 into the insulation layer 5. In other embodiments, the fixing member 4 can also be in the form of a cylinder, a cone, or a sheet, etc., which can achieve the purpose of squeezing and fixing the insulation layer 5.

[0045] Further, if Figure 1 and Figure 3 As shown, the outer cylinder 1 includes an outer cylinder body 11 and at least one separator 12, wherein the outer cylinder body 11 is coaxially sleeved on the outside of the inner cylinder 2, and the separator 12 extends along the axial direction of the outer cylinder body 11. The separator 12 is fixedly connected to the inner wall of the outer cylinder body 11 and extends radially toward the outer wall of the inner cylinder 2. The insulation layer 5 is filled between the outer circumferential wall of the inner cylinder 2, the inner circumferential wall of the outer cylinder 1, and the separator 12. This arrangement can divide the insulation layer 5 into blocks and separate the insulation layer 5 between the outer cylinder 1 and the inner cylinder 2, thereby increasing the contact area between the insulation layer 5 and the outer cylinder 1 after heating and curing, thereby enhancing the friction between the insulation layer 5, the inner cylinder 2, and the outer cylinder 1, and ensuring the relative position of the insulation layer 5 to the inner cylinder 2 and the outer cylinder 1.

[0046] Alternatively, as Figure 1 and Figure 3 As shown, in this embodiment, four separators 12 are evenly arranged along the circumference of the outer cylinder 1, which can further increase the contact area between the outer cylinder 1 and the thermal insulation layer 5. The separators 12 are further squeezed by the heated and cured thermal insulation layer 5, thereby increasing the friction between the thermal insulation layer 5 and the outer cylinder 1. In other embodiments, the number of separators 12 is not limited and can be one, two, three, or five, etc.

[0047] Further, if Figure 3As shown, the separator 12 is provided with fixing holes 121, which are filled with the insulation layer 5. This arrangement allows the insulation layer 5 to fill the fixing holes 121, further increasing the friction between the insulation layer 5 and the outer tube 1. This not only further ensures the relative position of the insulation layer 5 to the inner tube 2 and the outer tube 1, but also connects the insulation layers 5 evenly separated by the separator 12. After being heated and cured, the insulation layer 5 forms a continuous insulation barrier, improving the thermal insulation performance of the transition tube.

[0048] Optionally, in this embodiment, five fixing holes 121 are provided on the partition 12. If there are too many fixing holes 121, the partition 12 will lose its original function of increasing the friction between the insulation layer 5 and the outer tube 1. If there are too few fixing holes 121, the fixing holes 121 will not be able to connect the insulation layer 5 to form an insulation barrier.

[0049] Further, if Figure 1-Figure 3 As shown, the outer cylinder 1 also includes a mounting base 13, which is disposed at the first end of the outer cylinder body 11 and is fixedly connected to the outer cylinder body 11. The mounting base 13 is detachably connected to the furnace cover of the pouring furnace. The provision of the mounting base 13 facilitates assembly and disassembly of the mounting base 13 and the pouring furnace, improving the efficiency of the entire equipment installation. Furthermore, when the mounting base 13 or the furnace cover is replaced or upgraded, it will not cause excessive interference to other parts of the pouring furnace, ensuring the flexibility and scalability of the pouring furnace.

[0050] Alternatively, as Figure 2 and Figure 3 As shown, a groove 14 is defined on one of the first ends of the outer tube 1 and the inner tube 2, while a boss 21 is defined on the other. The boss 21 can be securely engaged with the groove 14. This arrangement provides positioning for the inner tube 2 within the outer tube 1, ensuring the stability of the installation of the inner and outer tubes 2 and 1. Optionally, in this embodiment, the groove 14 is defined on the first end of the outer tube 1 and the boss 21 is defined on the first end of the inner tube 2. In other embodiments, the boss 21 is defined on the first end of the outer tube 1 and the groove 14 is defined on the first end of the inner tube 2.

[0051] Alternatively, as Figure 2 and Figure 3As shown, a sealing material (not shown) is filled between the groove 14 and the boss 21. The sealing material is tightly adhered to or applied to the inner circumferential wall of the groove 14 and the outer surface of the boss 21, filling the tiny gap between the groove 14 and the boss 21. The sealing material has excellent sealing properties and can effectively prevent the unheated insulation layer 5 from leaking at the junction between the two. This ensures that the transition duct can operate stably under different working environments and pressure conditions, and avoids the degradation of the transition duct's insulation effect due to leakage of the unheated insulation layer 5, which could lead to casting quality problems.

[0052] Optionally, in this embodiment, the sealing material is a knotted material. This material prevents uncured insulation layer 5 from leaking through the gap between groove 14 and boss 21, and also provides thermal insulation. In other embodiments, the sealing material can be other materials that can seal the gap between groove 14 and boss 21.

[0053] Further, if Figure 1-Figure 3 As shown, the transition duct also includes a cover plate 3, which is fixedly connected to the end of the outer tube 1. Both the end of the outer tube 1 and the end of the insulation layer 5 are covered with the cover plate 3. Protected by the cover plate 3, the ends of the insulation layer 5 can better maintain the thermal insulation performance of the insulation layer 5, preventing heat loss from the ends, thereby ensuring the thermal insulation effect of the transition duct. It should be noted that the gap between the cover plate 3 and the inner tube 2 is also filled with sealing material. Specifically, the cover plate 3 and the end of the outer tube 1 are welded together.

[0054] Alternatively, as Figure 1-Figure 3 As shown, in this embodiment, the cover plate 3 and the fixing member 4 are fixedly connected, which can be welding or clamping, etc. In this embodiment, welding is preferred, which can improve the stability of the fixing member 4 in the insulation layer 5. In other embodiments, the cover plate 3 and the fixing member 4 can also be separated.

[0055] Optionally, in this embodiment, when the cover plate 3 is fixed to the end of the outer tube 1, the end surface of the cover plate 3 is flush with the end surface of the second end of the inner tube 2 along the axial direction of the outer tube 1, which not only ensures the integrity of the transition tube, but also avoids leakage of the insulation layer 5.

[0056] This embodiment also provides a low-pressure casting apparatus comprising a pouring furnace and the aforementioned transition tube, which is detachably connected to the pouring furnace. By utilizing the aforementioned transition tube, the low-pressure casting apparatus eliminates the need to replace the preheated inner cylinder 2 within the outer cylinder 1 before and after casting, simplifying the casting process and improving casting efficiency and product quality.

[0057] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Transition pipe, characterized in that: include: An outer cylinder (1) is used for connecting to a furnace cover of a pouring furnace; An inner cylinder (2) is coaxially arranged inside the outer cylinder (1), and the inner cylinder (2) is used to communicate with a riser pipe inside the casting furnace; and A heat-insulating layer (5) is sandwiched between the outer peripheral wall of the inner tube (2) and the inner peripheral wall of the outer tube (1).

2. The transition duct according to claim 1, characterized in that: The transition duct further comprises: A fixing member (4) is inserted into the thermal insulation layer (5) to squeeze and fix the thermal insulation layer (5).

3. The transition duct according to claim 1, characterized in that: The outer cylinder (1) comprises: An outer cylinder body (11), wherein the outer cylinder body (11) is coaxially sleeved on the outside of the inner cylinder (2); At least one partition (12), the partition (12) extending along the axial direction of the outer cylinder body (11), the partition (12) being fixedly connected to the inner wall of the outer cylinder body (11), and extending toward the outer wall of the inner cylinder (2) along the radial direction of the outer cylinder body (11), the thermal insulation layer (5) being filled between the outer peripheral wall of the inner cylinder (2), the inner peripheral wall of the outer cylinder (1) and the partition (12).

4. The transition duct according to claim 3, characterized in that: The partition (12) is provided with a fixing hole (121), and the fixing hole (121) is filled with the thermal insulation layer (5).

5. The transition duct according to claim 3, characterized in that: The outer cylinder (1) further comprises: The mounting seat (13) is arranged at the first end of the outer cylinder body (11) and is fixedly connected to the outer cylinder body (11). The mounting seat (13) is detachably connected to the furnace cover of the pouring furnace.

6. The transition duct according to any one of claims 1 to 5, characterized in that: The heat-insulating layer (5) is a powder material, and the powder material can be solidified by heating.

7. The transition duct according to any one of claims 1 to 5, characterized in that: A groove (14) is provided on one of the first end of the outer tube (1) and the first end of the inner tube (2), and a boss (21) is provided on the other. The boss (21) can be fixedly engaged with the groove (14).

8. The transition duct according to claim 7, characterized in that: The space between the groove (14) and the boss (21) is filled with sealing material.

9. The transition duct according to any one of claims 1 to 5, characterized in that: The transition duct further comprises: A cover plate (3) is fixedly connected to the end of the outer cylinder (1), and the end of the outer cylinder (1) and the end of the thermal insulation layer (5) are both covered with the cover plate (3).

10. Low pressure casting equipment, characterized in that, It comprises a pouring furnace and a transition pipe according to any one of claims 1 to 9, wherein the transition pipe is detachably connected to the pouring furnace.

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