Injection system and die casting machine

Abstract

The utility model relates to the technical field of die casting, and discloses an injection system and a die casting machine, the injection system comprises: a housing, which is provided with a chamber capable of accommodating molten metal, and the upper end of which is provided with a cover plate; the two ends of the U-shaped pipe are arranged on the cover plate, the middle of the U-shaped pipe extends into the shell, one end of the U-shaped pipe is a discharging port, and a feeding hole located in the molten metal is formed in the U-shaped pipe; one end of the charging valve is connected to the feeding hole; the pressurizing device is arranged at the other end of the U-shaped pipe in a sealed mode and can inject gas into the U-shaped pipe. The injection system is arranged in the die-casting machine, and during die-casting operation, molten metal can be supplied into a die at a low speed, so that bubbles in the molten metal are effectively reduced, and the casting quality of a large thick-wall structural part is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of die casting technology, specifically to an injection system and a die casting machine. Background Technology

[0002] In modern die casting technology, especially for the die casting of large, thick-walled structural parts, there are still many technical challenges. The die casting of large, thick-walled castings requires a stable and uniform supply of molten metal, and the filling process must be carried out at an ultra-low speed to reduce air bubbles in the molten metal, thereby ensuring the quality of the casting.

[0003] However, traditional die-casting machines struggle to achieve such a low-speed and stable molten metal supply during operation, especially when processing large structural components. Excessive speed or uneven filling in conventional die-casting machines can lead to high gas content in the molten metal, causing defects such as porosity and cracks within the casting, severely impacting the quality and yield of the casting. Therefore, using traditional die-casting machines for large, thick-walled structural components is insufficient to meet the demands of large-scale industrial production and cannot consistently output high-quality castings. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides an injection system and a die-casting machine having the same, which can supply molten metal into the mold at a lower speed, thereby effectively reducing air bubbles in the molten metal and ensuring the casting quality of large, thick-walled structural parts.

[0005] According to one embodiment of the present invention, a pressure injection system is provided, comprising: a housing having a chamber capable of containing molten metal and a cover plate at the upper end; a U-shaped tube having both ends disposed on the cover plate and extending into the housing in the middle, with one end being a discharge port, and an inlet hole located in the molten metal on the U-shaped tube; a feeding valve having one end connected to the inlet hole; and a pressurizing device sealed at the other end of the U-shaped tube, capable of injecting gas into the U-shaped tube.

[0006] In one embodiment, the pressurization device includes an accumulator and a nitrogen separation device connected together, the accumulator being sealed to the other end of the U-tube.

[0007] As one embodiment, the pressurizing device further includes a pressure sensor and a liquid level sensor, both located at the other end of the U-shaped tube.

[0008] In one embodiment, the feeding valve is a valve stem that can move up and down on the cover plate, and when the valve stem moves downward, its lower end blocks the feed hole.

[0009] As one embodiment, the injection system further includes a heat-insulating heating rod disposed within the housing.

[0010] In one embodiment, the diameter of the end of the U-shaped tube near the discharge port is smaller than the diameter of the end of the U-shaped tube near the pressurizing device.

[0011] In one embodiment, the shell is a heat-insulating furnace or a melting furnace.

[0012] According to one embodiment of the present invention, a die-casting machine is provided, comprising: a fixed mold, horizontally arranged; a movable mold, slidably arranged above the fixed mold, forming a mold cavity when connected with the fixed mold; and an injection system as described above, wherein the discharge port is connected to the feed port on the fixed mold.

[0013] As one embodiment, the die-casting machine further includes: a plurality of pressure boosting mechanisms, located at a preset position above the moving mold, capable of applying pressure to the moving mold toward the fixed mold side.

[0014] Based on the above description and practical application, it is evident that the injection system of this invention applies pressure to the molten metal in the U-shaped tube via a pressurizing device, precisely controlling the flow rate of the molten metal. This allows it to flow smoothly into the mold at a low speed, significantly reducing the air bubble content in the molten metal. Consequently, it reduces defects such as porosity and cracks within the casting, thereby significantly improving the casting quality of large, thick-walled structural components. This is of great significance for large-scale industrial production, especially in applications requiring high casting precision and reliability.

[0015] This injection system, through an improved molten metal supply method, ensures a smooth and uniform filling process. When applied to die-casting machines, especially in the production of thick-walled castings, it effectively prevents uneven or excessively rapid molten metal flow, ensuring the structural integrity and uniformity of the castings. Attached Figure Description

[0016] Figure 1 This is a cross-sectional structural diagram of the injection system involved in one embodiment of the present invention.

[0017] Figure 2 This is a top view of the cover plate in the injection system according to one embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the structure of a die-casting machine involved in one embodiment of the present invention.

[0019] The attached figures are labeled as follows:

[0020] 11. Shell; 12. Cover plate; 13. Feed valve; 14. Molten metal; 15. Pressure sensor; 16. Liquid level sensor; 17. Insulation heating rod; 2. U-tube; 21. Injection chamber; 22. Injection cavity; 23. Outlet; 24. Feed hole; 25. Gas inlet; 26. Observation port; 31. Accumulator; 32. Nitrogen separation device; 41. Fixed mold; 42. Moving mold; 43. Tie column; 44. Pressurization mechanism. Detailed Implementation

[0021] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0022] Furthermore, the accompanying drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. It should be noted that in this disclosure, the terms "comprising," "configured with," and "set in" are used to indicate an open-ended inclusion, meaning that additional elements / components / etc. may exist besides those listed; the terms "first," "second," etc., are used only as labels and are not intended to limit the number or order of objects; the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] like Figure 1 and Figure 2As shown, in this embodiment, a pressure injection system is disclosed, including a housing 11, a U-shaped tube 2, a feeding valve 13, and a pressurizing device. The housing 11 has a closed chamber capable of containing molten metal 14 to be poured. A removable cover plate 12 is provided at the upper end of the housing 11. When the cover plate 12 is installed on the housing 11, the chamber inside the housing 11 can form a sealed environment.

[0025] The two ends of the U-shaped tube 2 are located on the cover plate 12, and the middle part of the U-shaped tube 2 extends into the housing 11. For example... Figure 1 As shown, the left and right sides of the U-shaped tube 2 are vertically arranged tubes, and their lower regions are connected to form the U-shaped tube 2. The right tube contains an injection chamber 21, and the left tube contains a filling chamber 22. One end of the filling chamber 22 is a discharge port 23. A feed port 24 is located in the middle of the U-shaped tube 2, allowing the molten metal 14 in the housing 11 to enter the U-shaped tube 2. A pressurizing device is sealed at one end of the injection chamber 21, which can inject gas into the U-shaped tube 2, such as nitrogen or other inert gases that do not react with the molten metal 14.

[0026] One end of the feeding valve 13 is connected to the feed port 24. By opening and closing the feeding valve 13, it is possible to control whether the molten metal 14 in the housing 11 flows into the U-shaped tube 2.

[0027] In operation, the discharge port 23 of this injection system is connected to the mold cavity of the die-casting machine. During operation, the feeding valve 13 is first opened, allowing the molten metal 14 in the housing 11 to flow into the U-tube 2. Then, the pressurizing device is activated, injecting gas at a preset pressure into the U-tube 2. This causes the molten metal 14 to be slowly transported upwards into the mold cavity. Because the molten metal 14 is slowly transported upwards into the mold cavity, air bubbles in the molten metal 14 are reduced, ensuring the casting quality of large, thick-walled structural parts. The flow rate of the molten metal 14 can be controlled by adjusting the pressure and speed of the gas injected into the U-tube 2 by the pressurizing device. Compared to traditional horizontally positioned hydraulic injection rods, this injection system can achieve lower injection speeds.

[0028] In this embodiment, the pressurization device includes a connected accumulator 31 and a nitrogen separator 32. The accumulator 31 is sealed to the gas inlet 25 at the injection chamber 21, allowing the stored gas to be injected into the injection chamber 21. A solenoid valve or similar structure can be installed between the accumulator 31 and the gas inlet 25 to facilitate precise control of the amount of gas supplied to the injection chamber 21. The nitrogen separator 32 is connected to the accumulator 31 and can separate nitrogen from the air in real time for use in the injection operation. Once the gas is trapped inside the injection chamber 21, it forms a "gas hammer," which pushes the molten metal 14 towards the injection chamber 22 at the left end, completing the injection process.

[0029] In this embodiment, the pressurization device further includes a pressure sensor 15 and a liquid level sensor 16. For example... Figure 1 As shown, both pressure sensor 15 and level sensor 16 are located at one end of the injection chamber 21 of the U-tube 2. Pressure sensor 15 monitors the gas pressure in the injection chamber 21 of the U-tube 2 to accurately control the injection speed. Level sensor 16 monitors the height of the molten metal 14 in the injection chamber 21 of the U-tube 2. Through the cooperation of these two sensors, sufficient molten metal 14 can be filled into the injection chamber 21, and the gas pressure and flow rate can be controlled to provide a stable injection force for the molten metal 14, achieving the required ultra-low speed injection. Both pressure sensor 15 and level sensor 16 are fixed to the cover plate 12 for easy installation and removal, and can be easily separated from the U-tube 2 when cleaning is required.

[0030] In this embodiment, the liquid level sensor 16 is a laser liquid level sensor. An observation port 26 is provided on the cover plate 12. The laser liquid level sensor can monitor the liquid level in the injection chamber 21 in real time through the observation port 26.

[0031] like Figure 1 As shown, in this embodiment, the feeding valve 13 is a valve stem that can move up and down on the cover plate 12. When the valve stem moves downward, its lower end blocks the feed hole 24. The valve stem can be controlled to move up and down by an electric control valve, which facilitates precise control of replenishing the molten metal 14 into the U-tube 2. The feed hole 24 is immersed in the molten metal 14. When the valve stem moves upward, the molten metal 14 can enter the U-tube 2 from the housing 11 through the feed hole 24 under the influence of gravity. After each injection, the feeding valve 13 can be controlled to replenish the U-tube 2 with an appropriate amount of molten metal 14 according to the amount of mold material used and the liquid level of the injection chamber 21 / injection chamber 22. The part of the valve stem that is in the molten metal 14 can be made of high-temperature resistant material, while other parts of the structure used to realize the action control can be made of conventional materials since they are on the cover plate 12, which can reduce the cost of the feeding valve 13 to a certain extent. In other embodiments, a high-temperature resistant electromagnetic control valve can also be directly installed on the U-tube 2, which can also achieve precise control of replenishing the molten metal 14 into the U-tube 2.

[0032] Furthermore, in this embodiment, a heat-insulating heating rod 17 is also provided in the housing 11, which enables the molten metal 14 in the housing 11 to be maintained at a preset temperature during the injection operation. In practical applications, the housing 11 can be either a furnace or a heat-insulating furnace. A furnace can directly produce molten metal 14 from solid metal materials, while a heat-insulating furnace can maintain the molten metal 14 at a preset temperature for a long period of time, ensuring that the properties of the molten metal 14 do not change during the injection operation.

[0033] Furthermore, in this embodiment, the diameter of the end of the U-shaped tube 2 near the outlet 23 is smaller than the diameter of the end of the U-shaped tube 2 near the pressurizing device. For example... Figure 1 As shown, the diameter of the injection chamber 22 at the left end of the U-shaped tube 2 is smaller than the diameter of the injection chamber 21 at the right end, which enables ultra-low speed injection of molten metal 14 with a smaller pressure.

[0034] In this embodiment, the U-shaped tube 2 is a shaped tube made of refractory materials such as silicon nitride. It is installed on the cover plate 12 as a detachable independent mechanism, which can be adapted to different models of holding furnaces. It can also be disassembled, cleaned, and replaced separately, making it easy to maintain. In practical applications, except for the contact between the injection chamber 22 and the mold, the entire U-shaped tube 2 is kept in a fully enclosed environment, immersed in the molten metal 14 inside the shell 11. The temperature of the U-shaped tube 2 can be maintained by the molten metal 14, so that the molten metal 14 inside can also maintain a preset temperature.

[0035] This injection system uses a non-physical gas hammer for low-speed injection control, and can also solve the problem of corrosion and damage to traditional solid hammers caused by aluminum alloy liquid 14 with high iron content, stabilize the composition of alloy liquid 14, and extend the service life of the injection system.

[0036] In this injection system, the U-shaped tube 2 can be removed along with the cover plate 12, allowing the casing 11 to be directly cleaned in the furnace, facilitating maintenance. The U-shaped tube 2 is made entirely of refractory material, and after separation from the cover plate 12 and disassembly of the pressurizing device, the internal slag can be removed by high-temperature heating. The control components, pressurizing device, sensors, etc., of the injection mechanism on the U-shaped tube 2 are all installed on the cover plate 12, not in contact with the molten metal 14, facilitating maintenance.

[0037] In this embodiment, a die-casting machine employing the aforementioned injection system is also disclosed. For example... Figure 3 As shown, the die-casting machine includes a fixed mold 41, a moving mold 42, and the aforementioned injection system. When die-casting large, thick-walled structural parts, it can achieve ultra-low-speed die-casting, supplying molten metal 14 to the mold at a lower speed, thereby effectively reducing air bubbles in the molten metal 14 and ensuring the casting quality of large, thick-walled structural parts.

[0038] Specifically, both the fixed mold 41 and the moving mold 42 are horizontally arranged, with the moving mold 42 positioned above the fixed mold 41. The moving mold 42 is slidably mounted on multiple guide pillars 43 and can slide up and down along the guide pillars 43. When the moving mold 42 and the fixed mold 41 abut together, a cavity with the same shape as the casting is formed between them. The discharge port 23 in the injection system is connected to the feed port of the fixed mold 41.

[0039] During die casting, the moving mold 42 and the fixed mold 41 are first fixedly connected together. Then, the feeding valve 13 is opened to allow the molten metal 14 in the housing 11 to enter the U-tube 2. After that, the feeding valve 13 is closed, and the pressurizing device is activated to allow gas to enter the injection chamber 21 of the U-tube 2. The molten metal 14 in the U-tube 2 is then injected into the mold cavity at the required low speed. The molten metal solidifies under the preset pressure in the mold cavity to form the desired casting. During the die casting process, the molten metal 14 can flow upward into the mold cavity at a low speed, thereby effectively reducing air bubbles in the molten metal 14 and ensuring the casting quality of large, thick-walled structural parts.

[0040] Furthermore, in this embodiment, the die-casting machine also includes several pressure-boosting mechanisms 44. For example... Figure 3 As shown, the pressure boosting mechanism 44 is located at a preset position above the moving mold 42, and can apply pressure to the moving mold 42 towards the fixed mold 41. Specifically, the pressure boosting mechanism 44 has a telescopic end facing the moving mold 42. When it extends, it presses against the moving mold 42 to apply pressure. During die casting, the pressure boosting mechanism 44 can increase the pressure in the mold cavity, ensuring the quality of the casting. In the high-speed section of the die casting operation, the pressure boosting mechanism 44 can be used to perform the pressure boosting action, realizing the feeding of the molten metal 14 in the mold cavity.

[0041] The number and position of the pressurizing mechanism 44 can be set according to the size, structure and thickness of the casting. In addition, when designing the moving mold 42, more local pressurizing and feeding points can be added to correspond to each pressurizing device and match the feeding requirements of large castings.

[0042] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A pressure injection system, characterized in that, include: The shell has a chamber capable of containing molten metal and a cover plate at the top. A U-shaped tube is provided at both ends on the cover plate and extends into the housing in the middle. One end is the discharge port. The U-shaped tube is provided with a feed hole located in the molten metal. A feeding valve, one end of which is connected to the feed port; A pressurizing device, sealed at the other end of the U-tube, is capable of injecting gas into the U-tube.

2. The injection system as described in claim 1, characterized in that, The pressurization device includes an accumulator and a nitrogen separation device connected together, and the accumulator is sealed to the other end of the U-tube.

3. The injection system as described in claim 2, characterized in that, The pressurizing device also includes: Both the pressure sensor and the liquid level sensor are located at the other end of the U-shaped tube.

4. The injection system as described in claim 1, characterized in that, The feeding valve is a valve stem that can move up and down on the cover plate. When the valve stem moves downward, its lower end blocks the feed hole.

5. The injection system as described in claim 1, characterized in that, Also includes: A heat-insulating heating rod is disposed in the housing.

6. The injection system as claimed in claim 1, characterized in that, The diameter of the end of the U-shaped tube near the discharge port is smaller than the diameter of the end of the U-shaped tube near the pressurizing device.

7. The injection system as claimed in claim 1, characterized in that, The shell is a heat-insulating furnace or a melting furnace.

8. A die-casting machine, characterized in that, include: Fixed mold, horizontal setting; The moving mold is slidably disposed above the fixed mold and forms a mold cavity when connected with the fixed mold. The injection system as described in any one of claims 1 to 7, wherein the discharge port is connected to the feed port on the fixed mold.

9. The die-casting machine as described in claim 8, characterized in that, Also includes: Several pressurizing mechanisms are located at preset positions above the moving mold, and are capable of applying pressure to the moving mold toward the fixed mold side.

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