Multi-station centrifugal casting machine

Abstract

This utility model relates to the field of casting technology and discloses a multi-station centrifugal casting machine, including a base. Multiple worktables are provided on the upper surface of the base. A sleeve plate is fixed to the upper surface of each worktable. A casting unit is provided on the inner wall of the sleeve plate. An injection pipe is provided on one side of each casting unit, and a baffle is provided on the other side. This multi-station centrifugal casting machine, through the cooperation of the base, worktables, sleeve plate, injection pipe, baffle, and casting unit, allows the operator to first power a heating rod to generate heat before injecting high-temperature molten metal into the mold cavity inside the cylinder through the injection pipe. This heat is conducted through the heat transfer oil, keeping the inner wall of the cylinder at a high temperature. At this point, the high-temperature molten metal injected into the cylinder through the injection pipe will not encounter the mold cavity with a large temperature difference during the initial casting stage, thus preventing some of the high-temperature molten metal from rapidly pre-cooling and solidifying. This facilitates high-quality molding of the finished product and improves its practical performance.

Description

Technical Field

[0001] This utility model relates to the field of casting technology, specifically to a multi-station centrifugal casting machine. Background Technology

[0002] A centrifugal casting machine is a device that pours molten metal into a rotating mold, where it fills and solidifies into a casting through centrifugal force. Specifically, the working principle of a centrifugal casting machine is to inject molten metal into a high-speed rotating mold, allowing the molten metal to fill the mold and form a casting under centrifugal force. This casting method helps to remove gases and inclusions from the molten metal, influencing the metal's crystallization process and thus improving the mechanical and physical properties of the casting.

[0003] The prior art utility model patent with authorization announcement number CN 218015678 U discloses a centrifugal casting machine for bimetallic pipe fittings. The output shaft of the first motor is fixedly connected to the first connecting shaft, and the side of the first bevel gear is meshed with the second bevel gear. Although it can allow liquid metal to be gradually poured from one end of the mold to the other end, shortening the flow path of the liquid metal in the mold, it can make the liquid metal evenly dispersed after entering the mold.

[0004] However, its structure still has some minor drawbacks during use. For example, the casting structure is only a single cylindrical structure, which cannot achieve high-temperature heating inside the mold cavity. When the hot molten metal encounters the mold cavity with a large temperature difference in the early stage of casting, some of the hot molten metal will be rapidly pre-cooled and solidified, which can easily cause surface defects in the subsequent finished products. Its practical performance needs to be further improved. Utility Model Content

[0005] The purpose of this invention is to provide a multi-station centrifugal casting machine that can heat the mold cavity for forming the casting film at high temperature, preventing the hot molten metal from encountering the mold cavity with a large temperature difference in the early stage of casting, and preventing the rapid pre-cooling and solidification of some hot molten metal, thus facilitating the high-quality forming of the cast product and further enhancing its practical performance, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a multi-station centrifugal casting machine, including a base, with multiple worktables on the upper surface of the base, a sleeve plate fixedly connected to the upper surface of the worktables, a casting unit on the inner wall of the sleeve plate, an injection pipe on one side of the casting unit, a baffle on the other side of the casting unit, a protective sleeve unit on the outer side of the casting unit, and a protective unit below the casting unit. The casting unit includes: a cylinder, located inside the sleeve plate, with a cavity inside the cylinder containing heat-conducting oil, and a pair of heating rods on both sides of the cavity. End caps are rotatably connected to both ends of the cylinder, and the end caps are fixedly connected to the heating rods. One end cap is connected to the injection pipe, and the other end cap is connected to the baffle.

[0007] Preferably, the inner wall of the cavity is provided with multiple grooves.

[0008] Preferably, a pair of support rods are fixedly connected to the upper surface of the workbench, and the top ends of the support rods are fixedly connected to the end caps.

[0009] Preferably, the sheath unit includes: a heat-reflecting layer, the heat-reflecting layer being fixedly sleeved on the outer wall of the cylinder, a heat-insulating layer being fixedly sleeved on the outer wall of the heat-reflecting layer, and a sleeve being fixedly sleeved on the outer wall of the heat-insulating layer, the sleeve being rotatably connected to the sleeve plate through a ball bearing.

[0010] Preferably, the protective unit includes: a pair of horizontal holes, the pair of horizontal holes being respectively opened below the two end caps near the surface of the cylinder, the bottom end of the end caps being fixedly connected to a vertical pipe, the vertical pipe communicating with the interior of the horizontal holes, the outer wall of the vertical pipe being fixedly connected to a joint, and pressure relief valves being provided at the bottom ends of both sides of the cavity, the pressure relief valves being fixedly connected to the cylinder.

[0011] Preferably, a valve is fixedly connected to the bottom end of the riser, a pagoda head is fixedly connected to the bottom end of the valve, and an observation window is fixedly connected to the front side of the outer wall of the riser.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This multi-station centrifugal casting machine has the following advantages over traditional technology:

[0013] Through the coordination between the base, worktable, sleeve plate, injection pipe, baffle and casting unit, before injecting high-temperature molten metal into the mold cavity inside the cylinder through the injection pipe, the operator first supplies power to the heating rod to generate heat. Through the conduction of heat transfer oil, the inner wall of the cylinder is kept at a high temperature. At this time, the high-temperature molten metal is injected into the cylinder through the injection pipe, so that the high-temperature molten metal in the early stage of casting will not come into contact with the mold cavity with a large temperature difference. This will prevent some of the high-temperature molten metal from being rapidly pre-cooled and solidified, making it easier to form high-quality cast products and improving practical performance.

[0014] Through the cooperation of the base, worktable, sleeve plate, injection pipe, baffle, casting unit, and protective sleeve unit, the heat-reflecting layer possesses certain heat-reflecting properties, reflecting the heat diffused from the cylinder to the outside. Combined with the excellent heat insulation effect of the insulation layer, it can significantly reduce the heat diffusion from the cylinder to the outside, facilitating the full utilization of heat. Through the cooperation of the base, worktable, sleeve plate, injection pipe, baffle, casting unit, and protective unit, during long-term use, if the internal pressure of the cavity increases due to pressure or heating setting errors, and the pressure exceeds the threshold of the pressure relief valve, the pressure relief valve will open, allowing some of the heat transfer oil inside the cavity to flow. This oil is then conducted through the horizontal holes, vertical pipes, and joints into the external heat transfer oil collection container, ensuring the safe and stable operation of the machine. Attached Figure Description

[0015] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 for Figure 1 A partial sectional view of the worktable, plate, and sleeve from below;

[0018] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0019] Figure 4 for Figure 1 A three-dimensional structural diagram of the middle end cap.

[0020] In the diagram: 1. Base, 2. Workbench, 3. Sleeve plate, 4. Injection pipe, 5. Baffle, 6. Cylinder, 7. Cavity, 8. Heat transfer oil, 9. Heating rod, 10. End cap, 11. Groove, 12. Reverse heat layer, 13. Insulation layer, 14. Sleeve, 15. Horizontal hole, 16. Riser, 17. Connector, 18. Pressure relief valve, 19. Observation window, 20. Valve, 21. Pagoda head, 22. Support rod. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figures 1-4 This utility model provides a technical solution: a multi-station centrifugal casting machine, including a base 1, a plurality of worktables 2 on the upper surface of the base 1, a sleeve plate 3 fixedly connected to the upper surface of the worktables 2, a casting unit on the inner wall of the sleeve plate 3, an injection pipe 4 on one side of the casting unit, a baffle 5 on the other side of the casting unit, a protective sleeve unit on the outer side of the casting unit, and a protective unit below the casting unit. The casting unit includes: a cylinder 6, the cylinder 6 is located inside the sleeve plate 3, a cavity 7 is provided inside the cylinder 6, heat transfer oil 8 is provided inside the cavity 7, a pair of electric heating rods 9 are provided on both sides inside the cavity 7, and end caps 10 are rotatably connected to both ends of the cylinder 6. The end caps 10 are fixedly connected to the electric heating rods 9, one end cap 10 is connected to the injection pipe 4, and the other end cap 10 is connected to the baffle 5.

[0023] In the specific implementation process, it is worth noting that the base 1 is connected to the production workshop floor via expansion bolts to ensure the stable operation of the entire machine. The sleeve 3 is used to support the casting unit. The injection pipe 4 is used to inject high-temperature molten metal into the casting unit. The baffle 5 is connected to the casting unit via fasteners. The baffle 5 can be installed and disassembled, and after disassembly, it is easy to remove the castings inside the casting unit. The heat transfer oil 8 is a hydrogenated terphenyl type heat transfer oil, but other types of industrial heat transfer oil can also be used. It is a special oil with good thermal stability used for indirect heat transfer, characterized by uniform heating and accurate temperature control. With its wide temperature range, high thermal stability, high heat transfer efficiency, and low system pressure, heat transfer oil has become an ideal choice in the field of industrial heat transfer. The cylinder 6 is made of ductile iron, but other commonly used materials can also be used. The material of the casting mold is, for example, carbon steel / alloy steel. The power cord of the heating rod 9 is connected to an external power supply device to provide the necessary power for its operation. The specific model of the heating rod 9 is not limited, as long as it meets the requirements for normal use. The operation of the heating rod 9 can heat the heat transfer oil 8. The end cover 10 is rotatably connected to the cylinder 6 through a high-temperature resistant sealed bearing. The high-temperature resistant sealed bearing is made of heat-resistant bearing steel (high-temperature bearing steel). This steel has sufficiently high high-temperature hardness, wear resistance, contact fatigue strength, oxidation resistance and high-temperature dimensional stability. Common high-temperature resistant bearing steels include Cr4Mo4V, Cr15Mo4 and 12Cr2Ni3Mo5. High-temperature sealed bearings are usually equipped with sealing rings or seals on both the inner and outer sides to prevent lubricant leakage and external impurities from entering the bearing, ensuring that the bearing can operate stably for a long time in a high-temperature environment.

[0024] Furthermore, the inner wall of the cavity 7 is provided with multiple grooves 11.

[0025] In the specific implementation process, it is worth noting that the setting of multiple grooves 11 can increase the distance between the heat transfer oil and the inner wall of the cylinder 6, which facilitates the increase of the temperature rise rate of the inner wall of the cylinder 6.

[0026] Furthermore, a pair of support rods 22 are fixedly connected to the upper surface of the workbench 2, and the top ends of the support rods 22 are fixedly connected to the end cap 10.

[0027] In the specific implementation process, it is worth noting that the setting of the support rod 22 can improve the stability of the end cover 10.

[0028] Furthermore, the sheath unit includes: a heat-reflecting layer 12, which is fixedly sleeved on the outer wall of the cylinder 6; a heat-insulating layer 13 is fixedly sleeved on the outer wall of the heat-reflecting layer 12; a sleeve 14 is fixedly sleeved on the outer wall of the heat-insulating layer 13; and the sleeve 14 is rotatably connected to the sleeve plate 3 via a ball bearing.

[0029] In the specific implementation process, it is worth noting that the heat-reflecting layer 12 is made of aluminum foil, which has a certain heat-reflecting efficiency and can reflect part of the heat that diffuses from the cylinder 6 to the outside. Of course, the material of the heat-reflecting layer 12 can also be other conventional heat-reflecting layers such as aluminized steel and ceramic coating. This application does not protect the material, and the description is only for the convenience of understanding the implementation. The heat insulation layer 13 is a ceramic fiber blanket, which is a component to prevent heat loss, ensure safe use and improve energy efficiency. The material of the sleeve 14 is the same as that of the cylinder 6. After the sleeve plate 3 is rotatably connected to the sleeve 14 through the bearing, it can provide support force for it. The outer wall of the sleeve 14 is fixedly fitted with a toothed ring, which can be driven by gears. The gears can be driven by a servo motor to realize the rotation operation of the sleeve 14 and the cylinder 6.

[0030] Furthermore, the protective unit includes: a pair of horizontal holes 15, which are respectively opened on the two end caps 10 below the surface of the cylinder 6. The bottom end of the end cap 10 is fixedly connected to a vertical pipe 16, which is connected to the interior of the horizontal holes 15. The outer wall of the vertical pipe 16 is fixedly connected to a connector 17. The bottom ends of both sides of the cavity 7 are provided with pressure relief valves 18, which are fixedly connected to the cylinder 6.

[0031] In the specific implementation process, it is worth noting that the pressure relief valve 18 is usually equipped with a spring and piston system (or valve core). When the system pressure exceeds the preset value, the pressure will overcome the resistance of the spring and push the piston or valve core to move, thereby opening the valve and releasing the excess pressure. If the pressure inside the cavity 7 increases due to pressure or heating setting operation errors, when the pressure intensity is greater than the threshold of the pressure relief valve 18, the pressure relief valve 18 is in the open state, allowing some of the heat transfer oil 8 inside the cavity 7 to flow for pressure relief. The riser 16 is interconnected with the interior of the horizontal hole 15 and the connector 17. The end of the connector 17 away from the riser 16 is connected to the external heat transfer oil collection container.

[0032] Furthermore, a valve 20 is fixedly connected to the bottom end of the riser 16, a pagoda head 21 is fixedly connected to the bottom end of the valve 20, and an observation window 19 is fixedly connected to the front side of the outer wall of the riser 16.

[0033] In the specific implementation process, it is worth noting that during subsequent equipment maintenance, the operator can connect the pagoda head 21 to the heat transfer oil delivery pipeline and open the valve 20 to drain the heat transfer oil 8 inside the riser 16. The observation window 19 is made of transparent high-purity quartz glass, which makes it easy for external staff to know whether there is heat transfer oil 8 inside the riser 16, so that the equipment can be shut down for maintenance in a timely manner.

[0034] Centrifugal casting operation:

[0035] The operator first supplies power to the heating rod 9 to generate heat. Through the conduction of heat transfer oil 8, the inner wall of the cylinder 6 is kept at a high temperature. At this time, the cylinder 6 is rotated and high-temperature molten metal is injected into the mold cavity inside the cylinder 6 through the injection pipe 4. Under the action of centrifugal force, the molten metal fills the mold and forms a casting. During this process, the inner wall of the cylinder 6 is kept at a high temperature, which prevents the high-temperature molten metal from encountering the mold cavity with a large temperature difference in the early stage of casting. This prevents the rapid pre-cooling and solidification of some of the high-temperature molten metal, which is conducive to the high-quality molding of the cast product.

[0036] Casting removal operation:

[0037] After the casting inside the cylinder 6 has cooled down, the baffle 5 can be removed. Tools such as pry bars and wedges, or equipment such as hydraulic devices or robotic arms, can be used to separate the casting from the mold. After the molded casting is removed, the baffle 5 needs to be reset for future use.

[0038] Energy-saving operations during heating:

[0039] The heat-reflecting layer 12 has certain heat-reflecting properties, which can reflect the heat diffused from the cylinder 6 to the outside. Combined with the excellent heat insulation effect of the insulation layer 13, it can significantly reduce the heat diffusion from the cylinder 6 to the outside, making full use of heat and achieving a certain energy-saving effect.

[0040] Safe and stable operation of the machine body:

[0041] During prolonged use, if the internal pressure of cavity 7 increases due to pressure or heating setting errors, and the pressure exceeds the threshold of pressure relief valve 18, pressure relief valve 18 will open, allowing some of the heat transfer oil 8 inside cavity 7 to flow through. This heat transfer oil is then conducted through horizontal hole 15, riser pipe 16, and connector 17 into the external heat transfer oil collection container, ensuring the safe and stable operation of the machine. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-station centrifugal casting machine, comprising a base (1), characterized in that: The upper surface of the base (1) is provided with multiple workbenches (2), and the upper surface of the workbenches (2) is fixedly connected with a sleeve plate (3). The inner wall of the sleeve plate (3) is provided with a casting unit. One side of the casting unit is provided with an injection pipe (4), and the other side of the casting unit is provided with a baffle (5). The outer side of the casting unit is provided with a protective sleeve unit, and the lower part of the casting unit is provided with a protective unit. The casting unit includes: a cylinder (6), the cylinder (6) is located inside the sleeve plate (3), the inside of the cylinder (6) is provided with a cavity (7), the inside of the cavity (7) is provided with heat transfer oil (8), and a pair of electric heating rods (9) are provided on both sides of the inside of the cavity (7). Both ends of the cylinder (6) are rotatably connected with end caps (10), the end caps (10) are fixedly connected to the electric heating rods (9), one side of the end cap (10) is connected to the injection pipe (4), and the other side of the end cap (10) is connected to the baffle (5).

2. The multi-station centrifugal casting machine according to claim 1, characterized in that: The inner wall of the cavity (7) is provided with multiple grooves (11).

3. The multi-station centrifugal casting machine according to claim 1, characterized in that: A pair of support rods (22) are fixedly connected to the upper surface of the workbench (2), and the top of the support rods (22) is fixedly connected to the end cap (10).

4. The multi-station centrifugal casting machine according to claim 1, characterized in that: The sheath unit includes: a heat-reflecting layer (12), which is fixedly sleeved on the outer wall of the cylinder (6), and a heat-insulating layer (13) is fixedly sleeved on the outer wall of the heat-reflecting layer (12). A sleeve (14) is fixedly sleeved on the outer wall of the heat-insulating layer (13), and the sleeve (14) is rotatably connected to the sleeve plate (3) through a ball bearing.

5. The multi-station centrifugal casting machine according to claim 1, characterized in that: The protective unit includes: a pair of horizontal holes (15), the pair of horizontal holes (15) are respectively opened below the two end caps (10) near the surface of the cylinder (6), the bottom end of the end cap (10) is fixedly connected to a vertical pipe (16), the interior of the vertical pipe (16) and the horizontal holes (15) are interconnected, the outer wall of the vertical pipe (16) is fixedly connected to a connector (17), and the bottom ends of both sides of the cavity (7) are provided with pressure relief valves (18), the pressure relief valves (18) are fixedly connected to the cylinder (6).

6. The multi-station centrifugal casting machine according to claim 5, characterized in that: A valve (20) is fixedly connected to the bottom end of the riser (16), a pagoda head (21) is fixedly connected to the bottom end of the valve (20), and an observation window (19) is fixedly connected to the front side of the outer wall of the riser (16).

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