Feeding and injection device of die casting machine

Abstract

The invention relates to the technical field of die casting, in particular to a feeding and injection device of a die casting machine. Comprising a charging barrel, a punch, an injection rod, an injection oil cylinder, a charging barrel sealing plate, a liquid inlet pipe and a driving part, the charging barrel is arranged in the fixed plate, the injection oil cylinder is arranged below the fixed plate, a punch is arranged in the charging barrel, a sealing plate is arranged on the side edge of the charging barrel, a guide structure is arranged on the sealing plate and matched with the charging barrel, a driving component is arranged on the bottom side of the sealing plate and fixed to the fixed plate, and the sealing plate moves under the action of the driving component. A charging barrel opening in the side surface of the charging barrel is opened and closed. When the sealing plate is in an open state, molten metal in the liquid inlet pipe begins to enter the charging barrel through the opening, the sealing plate closes the side opening of the charging barrel, the punch presses the molten metal into a mold cavity under the action of the injection oil cylinder, and a die-casting product is obtained after cooling forming. By adopting the opening and closing mode of the sealing plate, the time or the cooling degree of molten metal in the charging barrel is reduced, the feeding precision and efficiency are improved, and the injection period is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of die casting, in particular to a feeding and injection device for a die casting machine. Background Art

[0002] Die casting involves the die-casting machine's die-casting mechanism pushing the injection piston at high speed and high pressure, filling the barrel (shot chamber) with liquid metal into the mold cavity where it solidifies. For vertical injection molding machines located below the mold, there are two methods of pouring. One method involves pouring molten metal into a vertical barrel before the mold is closed. After the molten metal is poured into the barrel, the mold is closed, and the injection punch rises to press the metal into the mold cavity. After cooling and solidification, the mold opens and ejects the casting, completing a die-casting cycle. The other method uses a swinging shooting platform. Before the die is filled, the barrel is lowered, then hydraulically swung outward with the barrel and shot cylinder. Molten metal is poured into the barrel using a ladle before returning to the vertical position for injection. The first method, which requires closing the mold after each filling, reduces production efficiency and makes the molten metal cool more easily, resulting in poor fluidity. The second method is cumbersome, inefficient, and prone to molten metal cooling.

[0003] In response to the above problems, this patent proposes a feeding and injection device for a die-casting machine. By driving the opening and closing of the sealing plate, the molten metal can be directly injected into the mold cavity at high speed and high pressure after the loading is completed, which greatly shortens the production time, ensures the fluidity of the molten metal, and improves the quality of the product. Summary of the Invention

[0004] The present application provides a feeding and injection device for a die-casting machine, which adopts the following technical solution: A feeding and injection device for a die-casting machine, comprising a barrel, a punch, a shot rod, an injection oil cylinder, a sealing plate, a liquid inlet pipe and a driving component; The barrel is arranged inside the fixed plate, the injection cylinder is arranged below the fixed plate, a punch is arranged inside the barrel, a sealing plate is arranged on the side of the barrel, a guide structure is arranged on the sealing plate to cooperate with the barrel, a driving component is arranged on the bottom side of the sealing plate, the driving component is fixed to the fixed plate, and the sealing plate moves under the action of the driving component to open and close the barrel opening on the liquid inlet pipe; An insulation furnace is provided at the bottom of the liquid inlet pipe. When the sealing plate is in the open state, the insulation furnace injects the molten metal from the liquid inlet pipe into the barrel through the internal air pressure. After the predetermined feed amount is reached, the sealing plate closes the side opening of the barrel, and the punch presses the metal into the mold cavity for molding under the action of the injection cylinder. After the punch moves forward and exceeds the barrel opening, the sealing plate opens the gap, and the insulation furnace is adjusted to a negative pressure state. The liquid inlet pipe contacts the air in the barrel to form a pressure difference, causing the molten metal in the liquid inlet pipe to flow back into the insulation furnace.

[0005] Optionally, the barrel opening is arranged at the rear end of the barrel, and the driving device is used to control the moving position of the sealing plate, which can be used to control the opening and closing of the channel and the flow rate of the molten metal entering the barrel.

[0006] Optionally, the inner shape of the sealing plate is consistent with the cross-section of the barrel, and the sealing plate fits in with the side opening of the inner wall of the barrel.

[0007] Optionally, a fixing plate is provided on the driving component, and the fixing plate is directly or indirectly fixed to the fixed plate.

[0008] Optionally, guide blocks are provided on both sides of the sealing plate, and guide rails are provided on the barrel. The guide rails slide in cooperation with the guide blocks, and the sealing plate can move along the axis direction of the barrel.

[0009] Optionally, the holding furnace raises the molten metal when the air pressure drops, the sealing plate is in an open state, and the molten metal enters the barrel and reaches a specified weight, thereby realizing quantitative feeding.

[0010] Optionally, when the molten metal in the barrel reaches a set weight, the detection structure sends a detected signal to the control center, and the control center controls the driving component to drive the sealing plate to move forward, thereby closing the passage between the barrel and the liquid inlet pipe.

[0011] Optionally, a plurality of supports are provided in the middle of the opening of the barrel, and corresponding grooves are provided on the back of the sealing plate.

[0012] Optionally, a guide surface is provided on the support to make the molten metal flowing through the barrel opening more stable.

[0013] A method for using a feeding and injection device for a die-casting machine, step A: closing a movable die and a fixed die, actuating a driving component to pull back a sealing plate, and opening a barrel; Step B: After the barrel opening is opened, the liquid inlet pipe is connected to the barrel opening on the barrel, and the other end of the liquid inlet pipe is connected to an external holding furnace. The holding furnace uses the gas pressure to send the molten metal into the barrel through the liquid inlet pipe; Step C: The molten metal enters the barrel and reaches the specified weight to achieve quantitative feeding. When the molten metal in the barrel reaches the set weight, the detection structure sends the detected signal to the control center, which controls the driving component to push the sealing plate forward until the front end of the sealing plate is pressed tightly against the barrel, closing the channel between the barrel and the liquid inlet pipe; Step D: After the molten metal is fed into the barrel, the punch presses the metal into the mold cavity under the action of the injection cylinder. When the punch moves forward and exceeds the barrel opening, the sealing plate opens the gap, and the holding furnace is adjusted to a negative pressure state. The liquid inlet pipe contacts the air in the barrel to form a pressure difference, causing the liquid metal in the liquid inlet pipe to flow back into the holding furnace.

[0014] Step E: The injection rod continues to drive the punch upward at high speed and high pressure to hydraulically inject the metal into the casting mold cavity, and the die-cast product is obtained after cooling.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. Compared with the traditional feeding method, after the feeding is completed and the barrel opening is closed, the molten metal can be directly injected into the mold cavity at high speed and high pressure, which reduces the cooling degree of the molten metal, improves the feeding efficiency, and shortens the injection cycle; 2. The molten metal enters the barrel through the barrel opening at the tail end of the barrel. The liquid level rises from the bottom, which can discharge the gas in the barrel from the top, reducing the probability of metal splashing and gas entrainment when the molten metal fills the barrel, thereby improving the quality of the die-casting product; 3. The structure is simple and reliable. The swing hinge shaft of the traditional swing-type injection cylinder needs to withstand a large injection reaction force and long-term wear, which leads to a short service life of the injection mechanism. The injection cylinder of this device is a fixed mechanism, and the moving soup opening structure is compact and small, thereby improving the service life of the injection mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be discussed below. Obviously, the technical solutions described in conjunction with the drawings are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments and their drawings can be obtained based on the embodiments shown in these drawings without paying any creative work.

[0017] Figure 1 It is the overall structure diagram of the present invention.

[0018] Figure 2 It is a schematic diagram of the overall side structure of the present invention.

[0019] Figure 3 It is a cross-sectional view of the present invention.

[0020] Figure 4 It is an enlarged cross-sectional view of the present invention.

[0021] Figure 5 It is a schematic diagram of the connection of the driving components of the present invention.

[0022] Figure 6 It is a side view of the driving component of the present invention.

[0023] Figure 7 It is a schematic diagram of the connection between the sealing block and the punch of the present invention.

[0024] Figure 8 It is a schematic diagram of the sealing plate of the present invention.

[0025] Figure 9 It is a schematic diagram of the liquid inlet pipe of the present invention.

[0026] Figure 10 It is a schematic diagram of the barrel opening and sealing plate of the present invention.

[0027] Figure 11 It is a schematic diagram of the improvement of the barrel opening in Example 2 of the present invention.

[0028] In the figure: 1. Injection cylinder; 101. Cylinder mouth; 2. Cylinder column; 201. Injection rod; 202. Punch; 3. Fixed plate; 301. Barrel; 302. Guide rail; 4. Fixed mold; 5. Mold cavity; 6. Mold; 7. Moving mold; 8. Liquid inlet pipe; 801. Barrel opening; 802. Support; 9. Closing plate; 901. Guide block; 902. Copper block; 903. Leaf spring; 10. Driving component; 1001. Fixed plate. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions of various embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0032] An embodiment of the present invention provides a feeding and injection device for a die-casting machine.

[0033] Example 1: Figure 1-10As shown, a feeding and injection device for a die-casting machine includes a fixed plate 3, a fixed mold 4 is provided on the fixed plate 3, and a movable mold 7 is movable. After the movable mold 7 and the fixed mold 4 are closed, a casting mold cavity 5 is formed; a barrel 301 is provided inside the fixed plate 3, and the barrel 301 is connected to the injection port on the fixed plate 4. The metal liquid in the barrel 301 enters the casting mold cavity 5 through the injection port on the fixed plate 4; a punch 202 is provided in the barrel 301, and the punch 202 can move along the barrel axis in the barrel 301. The punch 202 is provided on the cylinder column 2. The cylinder column 2 is provided with an injection cylinder 1, which is vertically arranged below the fixed plate. A cylinder port 101 is provided at the bottom of the injection cylinder 1 to realize oil supply to the injection cylinder 1; a injection rod 201 is provided on the injection cylinder 1, and the top of the injection rod 201 is connected to the punch 202. The injection rod 201 is arranged in the cylinder column 2. When the injection cylinder 1 is started, the injection column 201 in the cylinder column 2 is raised, thereby driving the punch 202 to move and rise in the barrel 301, and the metal in the barrel 301 is hydraulically injected into the mold cavity 5 for molding.

[0034] A movable sealing plate 9 is provided on the barrel 301. The inner shape of the sealing plate 9 is consistent with the cross-section of the barrel 301. At the same time, guide blocks 901 are provided on both sides of the sealing plate 9. A guide rail 302 is provided on the barrel 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 fixed plate 1001 is provided on the driving component 10. The fixed plate 1001 is fixed on the fixed plate 3. A driving device is provided on the driving component 10 for telescopic movement. 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 barrel on the guide rail 302, and the guide rail 302 and the guide block 901 also play a limiting role to prevent the sealing plate 9 from moving into the inside of the barrel.

[0035] A barrel opening 801 is provided at the tail end of the barrel 301, and a liquid inlet pipe 8 is provided outside the barrel opening 801. One end of the feed pipe 8 is shaped to fit the sealing plate 9, and the other end of the feed pipe 8 is fixedly connected to an external insulation furnace, and soup is fed into the barrel 301 from the insulation furnace.

[0036] During the injection process, the sealing plate 9 is subjected to the outward liquid pressure exerted by the liquid, the size of which is the product of the feed port area on the barrel 301 side 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 withdrawing outward.

[0037] Working principle: After the movable mold 7 and the fixed mold 4 are closed, the driving component 10 on the sealing plate 9 is started to pull the sealing plate 9 backward. At this time, the sealing plate 9 is in the open state, and 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 insulation furnace. The insulation furnace increases the molten metal as the air pressure decreases. The molten metal enters the barrel 301 and reaches the specified weight, thereby realizing quantitative feeding.

[0038] When the molten metal in the barrel 301 reaches a set weight, the detection structure sends the detected signal to the control center, and the control center controls the driving component 10 to drive the sealing plate 9 to move forward, closing the channel between the barrel 301 and the liquid inlet pipe 8.

[0039] After the filling is completed, the molten metal is stored in the barrel 301, and the injection cylinder 1 drives the injection rod 201 to move. The injection rod 201 moves and drives the punch 202 to press the metal into the mold cavity 5 at high speed and high pressure, and the die-cast product is obtained after cooling. At the same time, after the punch 202 moves upward and exceeds the barrel opening 801, the driving component 10 will drive the sealing plate 9 to move down a 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 diameter of the inner section of the barrel 301, when the punch 202 rises, the cylinder column 2 does not contact the inner section of the barrel 2. Therefore, after a part of the sealing plate 9 is opened, the barrel opening 801 will be in contact with the outside atmosphere, and at the same time, the inside of the insulation furnace connected to the liquid inlet pipe 8 is adjusted to negative pressure, and the external atmosphere and the inside of the insulation furnace form a pressure difference, so that the molten metal in the liquid inlet pipe quickly flows back to the furnace, preventing the molten metal in the liquid inlet pipe 8 from cooling. When the die casting of the product is completed, the punch 202 returns to its original position and starts the next working cycle.

[0040] Operation steps of the die-casting machine feeding and injection device: Step A: The movable mold 7 and the fixed mold 4 are closed, and the driving component 10 is started to pull the closing plate 9 back, and the closing plate 9 is opened; Step B: After the sealing plate 9 is opened, the barrel opening 801 on the barrel 301 is connected to the liquid inlet pipe 8, and the liquid inlet pipe 8 is connected to the external holding furnace. The holding furnace uses the pressure of the gas to send the molten metal into the barrel 301 through the liquid inlet pipe 8; Step C: The molten metal enters the barrel 301 and reaches a specified weight, achieving quantitative feeding. When the molten metal in the barrel 301 reaches the set weight, the detection structure sends a detected signal to the control center, which controls the driving component 10 to drive the sealing plate 9 to move upward, closing the passage between the barrel 301 and the liquid inlet pipe 8; Step D: After the molten metal is fed, it is stored in the barrel 301. The punch 202 presses the metal into the cavity of the mold 6 under the action of the injection cylinder 1. When the punch 202 moves forward and exceeds the barrel opening 801, the sealing plate 9 opens the gap, and the holding furnace is adjusted to a negative pressure state. The liquid inlet pipe contacts the air in the barrel 301 to form a pressure difference, causing the liquid metal in the liquid inlet pipe to flow back into the holding furnace.

[0041] Step E: The injection rod 201 continues to drive the punch upward to hydraulically inject the metal into the casting mold cavity at high speed and high pressure, and the die-cast product is obtained after cooling.

[0042] In order to prevent the liquid from leaking from the barrel opening 801, the contact surface between the sealing plate 9 and the barrel 301 should also be strictly sealed, such as Figure 10 As shown, the barrel 301 and the sealing plate 9 are fitted with each other at the beveled edges, with one side wider and the other side narrower. This also enables the sealing plate 9 to block the barrel opening 801 to prevent the molten metal from leaking out. At the same time, because the guide groove of the barrel 301 is limited after the sealing plate 9 is installed in the barrel 301, the leaf spring 903 is compressed, and the resulting restoring force causes the sealing plate 9 to press the track groove of the barrel 301 outward to achieve side sealing. This device uses external force to achieve sealing by pressing the top and side contact surfaces of the sealing plate 9. The force that drives the sealing plate 9 upward to close the barrel opening 801 seals the top contact surface of the sealing plate. During injection, the top side of the sealing plate 9 is sealed against the barrel 301 by the upward push of the driving component 10. At the same time, the limiting setting of the guide rail 302 on the sealing plate and the barrel 301 ensures that the side of the sealing plate 9 is tightly against the barrel 301.

[0043] Example 2: Figure 11 As shown, when the barrel 301 has a wide opening width, the span of the supports on both sides is large. To prevent significant deformation and leakage of the sealing plate 9 under liquid pressure, one or more supports 802 can be provided in the middle of the barrel opening 801, and corresponding grooves can be provided on the back of the sealing plate 9. The support 802 is provided with a guide surface to ensure a more stable flow of molten metal through the barrel 301 opening.

[0044] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims, not the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be encompassed within the present invention. Any reference numerals in the claims should not be construed as limiting the claim to which they relate.

[0045] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods 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 feeding and injection device of the die casting machine includes a barrel, a punch, an injection rod, an injection oil cylinder, a sealing plate, a liquid inlet pipe and a driving component; The barrel is arranged inside the fixed plate, the injection cylinder is arranged below the fixed plate, a punch is arranged inside the barrel, a sealing plate is arranged on the side of the barrel, a guide structure is arranged on the sealing plate to cooperate with the barrel, a driving component is arranged on the bottom side of the sealing plate, the driving component is fixed to the fixed plate, and the sealing plate moves under the action of the driving component to open and close the barrel opening on the liquid inlet pipe; An insulation furnace is provided at the bottom of the liquid inlet pipe. When the sealing plate is in the open state, the insulation furnace injects the molten metal from the liquid inlet pipe into the barrel through the internal air pressure. After the predetermined feed amount is reached, the sealing plate closes the side opening of the barrel, and the punch presses the metal into the mold cavity for molding under the action of the injection cylinder. After the punch moves forward and exceeds the barrel opening, the sealing plate opens the gap, and the insulation furnace is adjusted to a negative pressure state. The liquid inlet pipe contacts the air in the barrel to form a pressure difference, causing the molten metal in the liquid inlet pipe to flow back into the insulation furnace.

2. A die-casting machine feeding and injection device according to claim 1, characterized in that: The barrel opening is set at the tail end of the barrel, and the driving device is used to control the moving position of the sealing plate, which can be used to control the opening and closing of the channel and the flow rate of the molten metal entering the barrel.

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 fits the side opening of the inner wall of the barrel.

4. The die-casting machine feeding and injection device according to claim 1, characterized in that: A fixing plate is provided on the driving component, and the fixing plate is directly or indirectly fixed on 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 a guide rail is provided on the barrel. The guide rail slides in conjunction with the guide blocks, and the sealing plate can move along the axis direction of the barrel.

6. The die-casting machine feeding and injection device according to claim 1, characterized in that: The holding furnace is operated by a decrease in air pressure, which raises the molten metal. The sealing plate is in an open state, and the molten metal enters the barrel and reaches the specified weight, thus realizing quantitative feeding.

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

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

9. A 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 barrel opening more stable.

10. A method for using a die-casting machine feeding and injection device, used for the die-casting machine feeding and injection device according to any one of claims 1 to 9, characterized in that: Step A: The movable mold and the fixed mold are closed, and the driving component is started to pull the sealing plate back to open the barrel opening; Step B: After the barrel opening is opened, the liquid inlet pipe is connected to the barrel opening on the barrel, and the other end of the liquid inlet pipe is connected to an external holding furnace. The holding furnace uses the gas pressure to send the molten metal into the barrel through the liquid inlet pipe; Step C: The molten metal enters the barrel and reaches the specified weight to achieve quantitative feeding. When the molten metal in the barrel reaches the set weight, the detection structure sends the detected signal to the control center, which controls the driving component to push the sealing plate forward until the front end of the sealing plate is pressed tightly against the barrel, closing the channel between the barrel and the liquid inlet pipe; Step D: After the molten metal is fed into the barrel, the punch presses the metal into the mold cavity under the action of the injection cylinder. When the punch moves forward and exceeds the barrel opening, the sealing plate opens the gap, and the holding furnace is adjusted to a negative pressure state. The liquid inlet pipe contacts the air in the barrel to form a pressure difference, causing the liquid metal in the liquid inlet pipe to flow back into the holding furnace; Step E: The injection rod continues to drive the punch upward at high speed and high pressure to hydraulically inject the metal into the casting mold cavity, and the die-cast product is obtained after cooling.

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