A feeding and injection device for die casting machine

Abstract

This utility model relates to the field of die casting technology, and more particularly to a die casting machine feeding and injection device. It includes a barrel, a punch, an injection rod, an injection cylinder, a barrel sealing plate, a liquid inlet pipe, and a driving component. The barrel is disposed inside a fixed plate, and the injection cylinder is disposed below the fixed plate. The punch is disposed inside the barrel, and a sealing plate is disposed on the side of the barrel. The sealing plate has a guide structure that cooperates with the barrel. A driving component is disposed on the bottom side of the sealing plate and is fixed to the fixed plate. The sealing plate moves under the action of the driving component, opening and closing the barrel opening on the side. When the sealing plate is in the open state, the molten metal in the liquid inlet pipe begins to enter the barrel through the opening. The sealing plate closes the barrel opening, and the punch, under the action of the injection cylinder, forces the molten metal into the mold cavity. After cooling and solidification, a die-cast product is obtained. This sealing plate opening and closing method reduces the time or cooling degree of the molten metal in the barrel, improves feeding accuracy and efficiency, and shortens the injection cycle.

Description

Technical Field

[0001] This utility model relates to the field of die casting technology, and in particular to a die casting machine feeding and injection device. Background Technology

[0002] Die casting refers to the process where the die casting mechanism of a die casting machine uses high speed and high pressure to push the injection piston, filling the molten metal in the barrel (injection chamber) into the mold cavity and solidifying it into a shape. For vertical injection devices located below the mold, there are two casting methods. One method involves pouring molten metal into the vertical barrel before the mold closes. After the molten metal is poured into the barrel, the mold closes, the injection punch rises, and the molten metal is forced into the mold cavity. After cooling and solidification, the mold opens and the casting is ejected, completing one die casting cycle. The other method is a swing-type injection stage. Before molten metal is poured in, the barrel descends first, and then hydraulic pressure causes the barrel and injection cylinder to swing outward together. Molten metal is poured into the barrel using a ladle, and then the barrel returns to the vertical position for injection. The first method of pouring molten metal only closes the mold after each pour, reducing production efficiency, and the molten metal cools easily, resulting in poor fluidity. The second method of pouring molten metal suffers from cumbersome operations, low efficiency, and the molten metal cools easily.

[0003] To address the aforementioned problems, this patent proposes a feeding and injection device for a die-casting machine. By driving the opening and closing of the sealing plate, molten metal can be directly injected into the mold cavity at high speed and high pressure after feeding, which greatly shortens the production time, ensures the fluidity of the molten metal, and improves the quality of the product. Utility Model Content

[0004] This application provides a feeding and injection device for a die-casting machine, which adopts the following technical solution:

[0005] A die-casting machine feeding and injection device includes a material cylinder, a punch, an injection rod, an injection cylinder, a sealing plate, a liquid inlet pipe, and a drive component.

[0006] The material cylinder is located inside the fixed plate, the injection cylinder is located below the fixed plate, the punch is located inside the material cylinder, the sealing plate is located on the side of the material cylinder, the sealing plate is provided with a guide structure that cooperates with the material cylinder, the driving component is located on the bottom side of the sealing plate, the driving component is fixed on the fixed plate, and the sealing plate moves under the action of the driving component to open and close the material cylinder opening on the liquid inlet pipe.

[0007] A heat preservation furnace is installed at the bottom of the liquid inlet pipe. When the sealing plate is open, the heat preservation furnace injects molten metal from the liquid inlet pipe into the barrel through internal air pressure until the predetermined feed amount is reached. Then, the sealing plate closes the side opening of the barrel, and the punch, under the action of the injection cylinder, forces the molten metal into the mold cavity for forming. After the punch advances and passes the barrel opening, the sealing plate opens the gap opening, and the heat preservation furnace is adjusted to a negative pressure state. The liquid inlet pipe comes into contact with the air in the barrel to form a pressure difference, causing the molten metal in the liquid inlet pipe to flow back into the heat preservation furnace.

[0008] Optionally, the barrel opening is located at the tail of the barrel, and the drive device is used to control the movement position of the sealing plate, which in turn can be used to control the opening and closing of the channel for molten metal to enter the barrel and the flow rate.

[0009] Optionally, the inner shape of the sealing plate is consistent with the cross-section of the barrel, and the sealing plate has an opening on the side that fits the inner wall of the barrel.

[0010] Optionally, a fixing plate is provided on the drive component, and the fixing plate is directly or indirectly fixed to the mounting plate.

[0011] Optionally, guide blocks are provided on both sides of the sealing plate, and guide rails are provided on the material cylinder. The guide rails and guide blocks cooperate to slide, and the sealing plate can move along the axis of the material cylinder.

[0012] Optionally, the holding furnace lowers the air pressure, raising the molten metal. The sealing plate is in the open state, allowing the molten metal to enter the material cylinder and reach the specified weight, thus achieving quantitative feeding.

[0013] Optionally, when the molten metal in the barrel reaches the set weight, the detection structure sends the detected signal to the control center, which then controls the drive component to move the sealing plate forward, sealing the channel between the barrel and the inlet pipe.

[0014] Optionally, several supports are provided at the middle position of the opening of the barrel, and corresponding grooves are provided on the back of the sealing plate.

[0015] Optionally, a guide surface can be provided on the support to make the molten metal flowing through the feed inlet of the barrel more stable.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. Compared with the traditional molten metal injection method, after molten metal injection is completed and the barrel opening is closed, molten metal can be directly injected into the mold cavity at high speed and high pressure, which reduces the cooling degree of molten metal, improves molten metal injection efficiency, and shortens the injection cycle;

[0018] 2. The molten metal enters the barrel through the barrel opening located at the tail of the barrel. The liquid level rises from bottom to top, which can discharge the gas in the barrel from the top, reducing the probability of molten metal splashing and air entrapment when filling the barrel, and improving the quality of die-cast products.

[0019] 3. The structure is simple and reliable. The swing hinge shaft of the traditional swing injection cylinder has to withstand a large injection reaction force and long-term wear, resulting in a short service life of the injection mechanism. The injection cylinder of this device is a fixed mechanism, and the moving feed opening structure is compact and small, thereby improving the service life of the injection mechanism. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be discussed below. Obviously, the technical solutions described in conjunction with the accompanying drawings are only some embodiments of this utility model. For those skilled in the art, other embodiments and their accompanying drawings can be obtained from the embodiments shown in these drawings without creative effort.

[0021] Figure 1 This is an overall structural diagram of the present invention.

[0022] Figure 2 This is a schematic diagram of the overall side structure of this utility model.

[0023] Figure 3 This is a cross-sectional view of the utility model.

[0024] Figure 4 This is an enlarged cross-sectional view of the present invention.

[0025] Figure 5 This is a schematic diagram of the connection of the drive component of this utility model.

[0026] Figure 6 This is a side view of the drive component of this utility model.

[0027] Figure 7 This is a schematic diagram of the connection between the sealing block and the punch of this utility model.

[0028] Figure 8 This is a schematic diagram of the sealing plate of this utility model.

[0029] Figure 9 This is a schematic diagram of the liquid inlet pipe of this utility model.

[0030] Figure 10 This is a schematic diagram of the opening and sealing plate of the material cylinder of this utility model.

[0031] Figure 11 This is a schematic diagram of the improved barrel opening in Embodiment 2 of this utility model.

[0032] In the diagram: 1. Injection cylinder; 101. Cylinder port; 2. Cylinder column; 201. Injection rod; 202. Punch; 3. Fixed plate; 301. Barrel; 302. Guide rail; 4. Fixed mold; 5. Casting mold cavity; 6. Mold; 7. Moving mold; 8. Liquid inlet pipe; 801. Barrel opening; 802. Support; 9. Sealing plate; 901. Guide block; 902. Copper block; 903. Leaf spring; 10. Drive component; 1001. Fixed plate. Detailed Implementation

[0033] The technical solutions of various embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0034] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within 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.

[0036] An embodiment of this utility model provides a feeding and injection device for a die casting machine.

[0037] Example 1: As Figure 1-10 As shown, a die-casting machine feeding and injection device includes a fixed plate 3, on which a fixed mold 4 is disposed, and a movable mold 7 is movable, which, when closed with the fixed mold 4, forms a casting cavity 5; a material cylinder 301 is disposed inside the fixed plate 3, and the material cylinder 301 is connected to an injection port on the fixed plate 4, through which the molten metal in the material cylinder 301 enters the casting cavity 5; a punch 202 is disposed inside the material cylinder 301, and the punch 202 can move along the axis of the material cylinder 301, and the punch 202 is mounted on a hydraulic cylinder column 2. 2 is equipped with an injection cylinder 1, which is vertically positioned below the fixed plate. The bottom of the injection cylinder 1 is provided with an oil cylinder port 101 to supply oil to the injection cylinder 1. An injection rod 201 is provided on the injection cylinder 1. The top of the injection rod 201 is connected to the punch 202. The injection rod 201 is located inside the cylinder column 2. When the injection cylinder 1 is activated, the injection column 201 inside the cylinder column 2 is raised, thereby driving the punch 202 to move and rise inside the barrel 301, and hydraulically injecting the metal in the barrel 301 into the mold cavity 5 for forming.

[0038] A movable sealing plate 9 is provided on the material cylinder 301. The inner shape of the sealing plate 9 is consistent with the cross-section of the material cylinder 301. Guide blocks 901 are provided on both sides of the sealing plate 9. A guide rail 302 is provided on the material cylinder 301. The guide rail 302 cooperates with the guide block 901. A copper plate 902 is provided on the guide block 901. A leaf spring 903 is provided between the guide block 901 and the copper plate 902. A driving component 10 is provided on the bottom side of the sealing plate 9. A fixing plate 1001 is provided on the driving component 10. The fixing plate 1001 is fixed on the fixed plate 3. A driving device is provided on the driving component 10 to extend and retract. The movement of the driving component 10 will drive the sealing plate 9 to move up and down. The guide block 901 drives the sealing plate 9 to slide along the axis of the material cylinder on the guide rail 302. The guide rail 302 and the guide block 901 also play a limiting role to prevent the sealing plate 9 from moving into the material cylinder.

[0039] A cylinder opening 801 is provided at the tail of the cylinder 301. A liquid inlet pipe 8 is provided on the outside of the cylinder opening 801. One end of the liquid inlet pipe 8 is shaped to fit the sealing plate 9. The other end of the liquid inlet pipe 8 is fixedly connected to an external heat preservation furnace, and the heat preservation furnace feeds soup into the cylinder 301.

[0040] During the injection process, the sealing plate 9 bears the outward hydraulic pressure generated by the liquid, the magnitude of which is the product of the area of ​​the feed port on the side of the barrel 301 and the injection pressure. With the help of the cross-sectional shape of the sealing plate 9 and the barrel opening 801, the sealing plate 9 is limited on the outside to prevent it from retracting outward.

[0041] Working principle: After the moving mold 7 and the fixed mold 4 are closed, the driving component 10 on the sealing plate 9 is activated to pull the sealing plate 9 back. At this time, the sealing plate 9 is in the open state. The barrel opening 801 on the barrel 301 is connected to one end of the liquid inlet pipe 8. The liquid inlet pipe 8 is connected to an external heat preservation furnace. The heat preservation furnace decreases under the action of air pressure and raises the molten metal. The molten metal enters the barrel 301 and reaches the specified weight, realizing quantitative feeding.

[0042] When the molten metal in the barrel 301 reaches the set weight, the detection structure sends the detected signal to the control center. The control center controls the drive component 10 to move the sealing plate 9 forward, sealing the channel between the barrel 301 and the inlet pipe 8.

[0043] After the molten metal is poured, it is stored in the barrel 301. The injection cylinder 1 drives the injection rod 201 to move, which in turn drives the punch 202 to inject the molten metal into the mold cavity 5 at high speed and pressure. After cooling, the die-cast product is obtained. At the same time, after the punch 202 moves upward past the barrel opening 801, the drive component 10 will drive the sealing plate 9 to move downward a certain distance to obtain a certain opening distance. Because the diameter of the punch 202 is larger than the diameter of the lower cylinder column 2, and the diameter of the punch 202 is the same as the inner diameter of the barrel 301, when the punch 202 rises, the cylinder column 2 does not contact the inner diameter of the barrel 2. Therefore, after the sealing plate 9 is partially opened, the barrel opening 801 will contact the outside atmosphere. At the same time, the inside of the holding furnace connected to the liquid inlet pipe 8 is adjusted to a negative pressure. The pressure difference between the outside atmosphere and the inside of the holding furnace allows the molten metal in the liquid inlet pipe to flow back into the furnace quickly, preventing the molten metal in the liquid inlet pipe 8 from cooling down. Once the product die-casting is complete, the punch 202 returns to its original position and begins the next work cycle.

[0044] Die casting machine feeding and injection device operation steps: Step A: The moving mold 7 and the fixed mold 4 are closed, the drive component 10 is started to pull the sealing plate 9 back, and the sealing plate 9 is opened;

[0045] Step B: After the sealing plate 9 is opened, the cylinder opening 801 on the cylinder 301 is connected to the liquid inlet pipe 8. The liquid inlet pipe 8 is connected to the external holding furnace. The holding furnace sends the molten metal into the cylinder 301 through the liquid inlet pipe 8 by the action of air pressure.

[0046] Step C: The molten metal enters the barrel 301 and reaches the specified weight to achieve quantitative feeding. When the molten metal in the barrel 301 reaches the set weight, the detection structure sends the detected signal to the control center. The control center controls the drive component 10 to drive the sealing plate 9 to move upward and close the channel between the barrel 301 and the inlet pipe 8.

[0047] Step D: After the molten metal is poured, it is stored in the barrel 301. The punch 202, under the action of the injection cylinder 1, presses the molten metal into the cavity of the mold 6. When the punch 202 advances and passes the barrel opening 801, the sealing plate 9 opens the gap and the heat preservation furnace is adjusted to a negative pressure state. The liquid inlet pipe comes into contact with the air in the barrel 301 to form a pressure difference, causing the molten metal in the liquid inlet pipe to flow back into the heat preservation furnace.

[0048] Step E: The injection rod 201 continues to drive the punch upward at high speed and high pressure, injecting the metal into the casting mold cavity. After cooling, the die-cast product is obtained.

[0049] To prevent liquid leakage at the barrel opening 801, the contact surface between the sealing plate 9 and the barrel 301 should also have a strict seal, such as... Figure 10As shown, the barrel 301 and the sealing plate 9 are fitted together at an angle, with one side wider than the other. This allows the sealing plate 9 to block the barrel opening 801 and prevent molten metal from leaking out. Simultaneously, because the sealing plate 9 is inserted into the barrel 301, the leaf spring 903 is compressed due to the limiting position of the guide rail groove. The resulting restoring force causes the sealing plate 9 to press outward against the guide rail groove of the barrel 301, achieving a side seal. This device achieves a seal by pressing the top and side contact surfaces of the sealing plate 9 together using external force. The force driving the sealing plate 9 upward to close the barrel opening 801 seals the top contact surface of the sealing plate. During injection, the upward push of the drive component 10 ensures that the top side of the sealing plate 9 fits tightly against the barrel 301, while the limiting position of the guide rail 302 on the sealing plate and barrel 301 ensures that the side of the sealing plate 9 is in close contact with the barrel 301.

[0050] Example 2: As Figure 11 As shown, when the opening width of the barrel 301 is large, and the span between the supports on both sides is large, in order to prevent the sealing plate 9 from undergoing large deformation and leakage under liquid pressure, one or more supports 802 can be set at the middle position of the opening of the barrel 301, and a corresponding groove can be set on the back of the sealing plate 9. A guide surface is set on the support 802, which can make the molten metal flowing through the barrel 301 opening more stable.

[0051] 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 exemplary and not restrictive in all respects. The scope of this invention is defined by the appended claims, not by the foregoing description, and is therefore intended to encompass all variations falling within the meaning and scope of equivalents of the claims. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0052] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A feeding and injection device for a die-casting machine, characterized in that: The die casting machine's feeding and injection device includes a material cylinder, punch, injection rod, injection cylinder, sealing plate, liquid inlet pipe, and drive components; The material cylinder is located inside the fixed plate, the injection cylinder is located below the fixed plate, the punch is located inside the material cylinder, the sealing plate is located on the side of the material cylinder, the sealing plate is provided with a guide structure that cooperates with the material cylinder, the driving component is located on the bottom side of the sealing plate, the driving component is fixed on the fixed plate, and the sealing plate moves under the action of the driving component to open and close the material cylinder opening on the liquid inlet pipe. A heat preservation furnace is installed at the bottom of the liquid inlet pipe. When the sealing plate is open, the heat preservation furnace injects molten metal from the liquid inlet pipe into the barrel through internal air pressure until the predetermined feed amount is reached. Then, the sealing plate closes the side opening of the barrel, and the punch, under the action of the injection cylinder, forces the molten metal into the mold cavity for forming. After the punch advances and passes the barrel opening, the sealing plate opens the gap opening, and the heat preservation furnace is adjusted to a negative pressure state. The liquid inlet pipe comes into contact with the air in the barrel to form a pressure difference, causing the molten metal in the liquid inlet pipe to flow back into the heat preservation furnace.

2. The die-casting machine feeding and injection device according to claim 1, characterized in that: The barrel opening is located at the tail of the barrel, and the drive device is used to control the movement position of the sealing plate, which in turn can be used to control the opening and closing of the channel for molten metal to enter the barrel and the flow rate.

3. The die-casting machine feeding and injection device according to claim 1, characterized in that: The inner shape of the sealing plate is consistent with the cross-section of the barrel, and the sealing plate has an opening on the side that fits into the inner wall of the barrel.

4. The die-casting machine feeding and injection device according to claim 1, characterized in that: The drive component is equipped with a fixing plate, which is directly or indirectly fixed to the fixed plate.

5. The die-casting machine feeding and injection device according to claim 3, characterized in that: Guide blocks are provided on both sides of the sealing plate, and guide rails are provided on the material cylinder. The guide rails and guide blocks cooperate to slide, and the sealing plate can move along the axis of the material cylinder.

6. The die-casting machine feeding and injection device according to claim 1, characterized in that: The heat preservation furnace lowers the air pressure, raising the molten metal. The sealing plate is in the open state, and the molten metal enters the material cylinder, reaching the specified weight, thus achieving quantitative feeding.

7. The die-casting machine feeding and injection device according to claim 6, characterized in that: When the molten metal in the barrel reaches the set weight, the detection structure sends the detected signal to the control center. The control center then controls the drive component to move the sealing plate forward, sealing the channel between the barrel and the inlet pipe.

8. The die-casting machine feeding and injection device according to claim 1, characterized in that: Several supports are set at the middle position of the opening of the barrel, and corresponding grooves are set on the back of the sealing plate.

9. The die-casting machine feeding and injection device according to claim 8, characterized in that: A guide surface is provided on the support to make the molten metal flowing through the feed inlet of the barrel more stable.

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