Injection mechanism and die casting system

Abstract

The utility model relates to the technical field of die casting, and discloses an injection mechanism and a die casting system, the injection mechanism comprises an injection rod, an injection cylinder and a charging barrel, the injection rod comprises an injection punch, a fixed section and a middle section, two end parts of the middle section are provided with left-hand threads, and two ends of the middle section are respectively in threaded connection with the injection punch and the fixed section. The output end of the injection cylinder is connected with the fixed section; an end cover is arranged at the outer end of the charging barrel; the injection punch is slidably arranged in the pressure chamber of the charging barrel, and the middle section is in sliding contact with the end cover. The injection rod is of a three-section structure, if the injection punch and / or the middle section are / is abraded and need to be maintained and replaced, the injection punch and the fixed section can be fixed at the same time, then the injection punch and the fixed section can be detached from the middle section only by rotating the middle section, and the efficiency of maintaining and replacing the injection rod is improved. After the injection rod is applied to the injection mechanism and the die-casting system, the injection mechanism and the die-casting system can have the injection function and the die-casting function while achieving the injection function and the die-casting function.

Description

TECHNICAL FIELD

[0001] The utility model relates to die casting technical field, specifically, relates to a kind of injection mechanism and die casting system. BACKGROUND

[0002] Amorphous alloy has excellent performance in strength, hardness, toughness and the like, in order to ensure its amorphous characteristics, extra attention needs to be paid to its temperature control to form amorphous state during preparation and processing, and oxygen isolation needs to be kept at all times to avoid oxidation failure. However, the working environment of traditional die casting machine is difficult to match the requirements of high-precision temperature control and vacuum environment required by amorphous alloy. In some existing amorphous alloy die casting schemes, the full-cover type vacuum environment shell used is too large, which will affect the execution of processes such as feeding, melting and part taking of amorphous alloy that require opening of the vacuum environment shell, and will also greatly prolong the construction time of the vacuum environment, which is not conducive to efficient mass production. Some small vacuum melting cavity schemes are fixed on the barrel, and the cooperation with the die casting head plate structure and the melting system is poor, and there is interference between the feeding system and the vacuum melting cavity during the injection process, which affects the injection stroke, and the injection punch, barrel and other vulnerable parts lack replacement positions and are difficult to replace.

[0003] The traditional injection rod usually sets the injection punch and the main body as a split type, so that only the injection punch part needs to be replaced when the injection punch is worn out. However, during the amorphous alloy die casting process, the barrel needs to be provided with a vacuum environment, and the part of the barrel outer end in contact with the injection rod also needs to be sealed, which causes the main part of the injection rod to be easily worn out after multiple injection operations, and the entire injection rod needs to be replaced at this time, which is high in cost. UTILITY MODEL CONTENTS

[0004] The utility model is made to solve the above technical problems, and one of its purposes is to provide an injection rod that is easy to maintain and low in cost.

[0005] Another purpose of the utility model is to provide an injection mechanism that can stably inject material, and the injection rod therein is easy to maintain and low in cost.

[0006] Still another purpose of the utility model is to provide a die casting system, in which the vulnerable parts near the barrel are convenient to maintain and replace.

[0007] According to one embodiment of the utility model, an injection rod is provided, which comprises: an injection punch for injecting material in a compression chamber; a fixed segment for connecting with an injection cylinder; an intermediate segment provided with reverse-threaded threads at both ends, and the threads at both ends are respectively threadedly connected with the injection punch and the fixed segment.

[0008] As an embodiment, the length of the intermediate section is greater than the length of the injection punch and the length of the fixed section, and only the intermediate section is in sliding contact with an end cap of an outer end of the barrel during an injection stroke of the injection rod.

[0009] As an embodiment, the outer surface of the intermediate section is roughened.

[0010] According to an embodiment of the present application, an injection mechanism is provided, comprising: an injection rod as described above; an injection cylinder, the output end of which is connected to the fixed section; a barrel, which is sleeved on the injection rod and has an end cap at the outer end; wherein the injection punch is slidingly arranged in the compression chamber of the barrel, and the intermediate section is in sliding contact with the end cap.

[0011] As an embodiment, the end cap is a sealing end cap, and only the intermediate section of the injection rod is in dynamic sealing connection with the sealing end cap.

[0012] According to an embodiment of the present application, a die casting system is provided, comprising: an injection mechanism as described above; a die casting mechanism, which is provided with a mounting position capable of accommodating the barrel at the head plate.

[0013] As an embodiment, a lifting mechanism is fixed to the head plate and has a mounting plate capable of moving up and down; a vacuum melting mechanism is arranged on the mounting plate, and the discharge port of the melting cavity is opposite to the feed port of the barrel, and a sealing element capable of being connected to the feed port is arranged on the discharge port; wherein when the sealing element is connected to the feed port, a closed space is formed between the cavity of the die casting mold, the barrel and the melting cavity.

[0014] As an embodiment, the lifting mechanism comprises: a driving device fixed to the head plate and having an output end capable of moving up and down; a first guide fixed to the head plate; a lifting bracket connected to the output end; a second guide fixed to the lifting bracket and vertically slidingly connected to the first guide; wherein the mounting plate is fixed to the second guide.

[0015] As an embodiment, the driving device is two lifting cylinders separately arranged on both sides of the vacuum melting mechanism; the lifting mechanism comprises two sets of symmetrical first guides, second guides and mounting plates.

[0016] As an embodiment, a recess is formed in the head plate, and one end of the vacuum melting mechanism is arranged in the recess; the feed port of the barrel is arranged at the position of the recess.

[0017] Based on the above description and practice, it can be seen that the injection rod of this utility model consists of three sections. After a period of use, if the injection punch and / or the middle section are worn and need to be maintained or replaced, the injection punch and the fixed section can be fixed at the same time, and then only the middle section can be rotated to remove the injection punch and the fixed section from the middle section, which improves the efficiency of maintaining and replacing the injection rod.

[0018] The injection mechanism and die-casting system of this invention, after applying the injection rod, can simultaneously perform the functions of injection and die-casting. Furthermore, with the addition of a lifting mechanism and a vacuum melting mechanism, the die-casting system, during use, when the mounting plate moves downward to the preset position, the sealing element abuts against the feed inlet, forming a sealed space between the die-casting mold cavity, the barrel, and the melting chamber. At this time, the vacuum melting mechanism's vacuum pump operates, creating a vacuum environment within this sealed space, allowing subsequent melting and casting of the amorphous alloy to be carried out in a vacuum or vacuum environment. When maintenance or replacement of the barrel, injection rod, or other nearby components is required, the lifting mechanism can be used to separate the vacuum melting mechanism from the barrel, providing operating space for maintenance and replacement operations, making the die-casting system easier to use and maintain. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the injection rod involved in one embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of a die-casting system according to one embodiment of the present invention, which includes an injection mechanism and an injection rod.

[0021] Figure 3a and Figure 3b This is a partial cross-sectional view of the die-casting system in one embodiment of the present invention. Figure 3a The injection rod is located at the initial position of the injection stroke. Figure 3b The injection rod is located at the end of the maximum injection stroke.

[0022] Figure 4 This is a schematic diagram of the structure of the barrel in a die-casting system according to one embodiment of the present invention.

[0023] Figure 5 This is a schematic diagram of the assembly between the injection rod, the barrel, and the head plate in a die-casting system according to one embodiment of the present invention.

[0024] Figure 6a and Figure 6b This is a schematic diagram of the assembly of the lifting mechanism and the head plate in the die-casting system according to two different perspectives in one embodiment of the present invention.

[0025] Figure 7 The structure diagram of the lifting mechanism in the die casting system is shown in the embodiment of the die casting system.

[0026] Figure 8 The assembly diagram between the head plate and the head plate in the die casting system is shown in the embodiment of the die casting system.

[0027] Figure 9 The side structure diagram of the head plate in the die casting system is shown in the embodiment of the die casting system.

[0028] The reference signs in the drawings are as follows:

[0029] 11, head plate; 12, barrel; 13, sealing end cover; 14, feeding port; 15, compression chamber; 16, sealing groove; 17, recess; 18, head plate; 19, connecting rod; 21, injection rod; 22, injection cylinder; 211, injection punch; 212, middle section; 213, fixed section; 31, mounting plate; 32, driving device; 33, first guide; 34, lifting support; 35, second guide; 36, output end; 37, slot; 4, vacuum melting mechanism; 41, discharge port; 42, sealing element. DETAILED DESCRIPTION

[0030] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations may, however, be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the inventive aspects to those skilled in the art. Features described in the description and / or shown in the figures can be combined in any suitable manner without departing from the scope of the present disclosure.

[0031] In addition, the accompanying drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments and, as such, should not be considered limiting in any way. Identical reference numerals in the figures indicate identical or functionally similar elements, and thus the description will not be repeated. It should be noted that the use of the terms "including", "containing", "comprising", "having", "front", "back", "left", "right", "up", "down", "top", "bottom", "over", "under" and "parallel", among others, in the description, are used to specify the itineraries of the devices or elements as shown in the drawings, and are merely used to facilitate the description of the present disclosure and simplify the description, and are not intended to limit or imply that the devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present disclosure.

[0032] Unless otherwise defined, the terms "mounting", "connected", "connecting" are to be construed broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according of the specific circumstances.

[0033] According to one embodiment of the utility model, a plunger is provided, please refer to Figure 1 The plunger 21 comprises a plunger punch 211, an intermediate section 212 and a fixed section 213. The plunger punch 211 is used for plungering material in the compression chamber; the fixed section 213 is used for being connected with the plunger cylinder; the intermediate section 212 is provided with reverse thread at both ends, and the two ends are respectively threadedly connected with the plunger punch 211 and the fixed section 213.

[0034] After the plunger works for a period of time, if the plunger punch 211 and / or the intermediate section 212 need to be replaced due to significant friction, the plunger 21 with the structure can simultaneously fix the plunger punch 211 and the fixed section 213, then only rotate the intermediate section 212, so that the plunger punch 211 and the fixed section 213 can be detached from the intermediate section 212, thereby improving the efficiency of maintaining the plunger 21.

[0035] Please combine Figures 2 to 3b When the plunger is applied in the die casting system, the plunger punch 211 is slidably arranged in the barrel 12 and the compression chamber 15 in front of the cavity, the fixed section 213 is arranged outside the barrel 12 and connected with the plunger cylinder 22, and the intermediate section 212 is arranged between the plunger punch 211 and the fixed section 213. The length of the intermediate section 212 is greater than the length of the plunger punch 211 and the length of the fixed section 213. Correspondingly, in the plunger process, the sealing end cover 13 at the outer end of the barrel 12 only slides with the intermediate section 212.

[0036] Specifically, when the plunger 21 is located at the initial position of the plunger stroke, the plunger punch 211 is located at the left side of the sealing end cover 13, when the plunger 21 is located at the terminal position of the maximum plunger stroke, the fixed section 213 is located at the right side of the sealing end cover 13, and only the intermediate section 212 is in frictional contact with the sealing end cover 13 in the entire plunger stroke.

[0037] The three-section plunger 21 structure and the way of controlling the length of the intermediate section 212 so that the sealing end cover 13 always only rubs with the intermediate section 212 can avoid the joint between the plunger punch 211, the intermediate section 212 and the fixed section 213 from rubbing with the sealing end cover 13, thereby improving the service life of the sealing end cover 13 and the plunger 21.

[0038] Further, in the embodiment, the outer surface of the intermediate section 212 of the injection rod 21 is roughened, and when a closed environment is required, the injection rod 21 cooperates with the sealing end cap 13 on the barrel 12 to have better sealing performance, thereby ensuring that the barrel 12 can maintain a better closed environment during the injection operation.

[0039] According to an embodiment of the utility model, provide a kind of injection mechanism, please refer to Figures 2 to 3b The injection mechanism includes the injection rod 21, the barrel 12 and the injection cylinder 22. One end of the injection rod 21 is inserted into the barrel 12, the injection punch 211 is slidably arranged in the pressure chamber 15 of the barrel 12, and the intermediate section 212 is in sliding contact with the end cap of the outer end of the barrel 12. The output end of the injection cylinder 22 is connected to the fixed section 213 on the injection rod 21, so as to push the injection rod 21 to slide in the barrel 12.

[0040] The injection mechanism can inject the material in the barrel 12 to the other side of the pressure chamber 15, and simultaneously has the above-mentioned functions of the injection rod 21.

[0041] After the end cap of the outer end of the barrel 12 is set as the sealing end cap 13, only the intermediate section 212 of the injection rod 21 is in dynamic sealing connection with the sealing end cap 13 during the entire injection stroke, and the sealing performance between the outer end of the barrel 12 and the injection rod 21 can be maintained during the injection operation.

[0042] For example, in a specific embodiment, the length of the injection punch 211 is L1, the length of the intermediate section 212 is L2, and the length of the fixed section 213 is L3; in the initial position of the injection stroke, the distance between the sealing end cap 13 and the tail end of the fixed section 213 is S0, that is, the distance between the sealing end cap 13 and the injection cylinder 22 is S0; the maximum injection stroke is S1; S0-S1>L3, L2+L3>S0. Under the above parameter relationships, it can be ensured that only the intermediate section 212 rubs against the sealing end cap 13 during the entire injection stroke.

[0043] According to an embodiment of the utility model, provide a kind of injection mechanism, please refer to Figures 2 to 9The die casting system comprises a die casting mechanism and the injection mechanism. In the drawings, only the head plate 11 and the barrel 12 of the die casting mechanism are shown, and other structures such as the fixed mold, the movable mold, the middle plate, the tail plate, the mold opening and closing cylinder and the like are not shown in the drawings, and the non-innovative parts of the embodiment are provided with corresponding technical solutions in the prior art, and thus will not be described herein. Figure 3a The die casting system in the embodiment is applied to amorphous alloy die casting, and thus a sealing end cover 13 is arranged at the outer end face, i.e. the right end of the barrel 12, so as to set a vacuum or high-vacuum working environment, facilitating the amorphous alloy die casting operation.

[0044] The die casting system not only realizes the die casting operation, but also has the above-mentioned functions of the injection rod 21, and the easily damaged parts near the barrel 12 are convenient to maintain and replace.

[0045] Further, the die casting system further comprises a lifting mechanism and a vacuum melting mechanism 4. The lifting mechanism is fixed on the head plate 11 and has an installation plate 31 capable of moving up and down. The vacuum melting mechanism 4 is arranged on the installation plate 31, the discharge port 41 of the melting cavity of the vacuum melting mechanism 4 is opposite to the feeding port 14 of the barrel 12, and the sealing element 42 capable of being connected to the feeding port 14 is arranged on the discharge port 41. The vacuum melting mechanism 4 has the functions of melting and vacuumizing, and can set a vacuum or high-vacuum environment in a closed space.

[0046] When the installation plate 31 moves downward to a preset position during use of the die casting system, the sealing element 42 abuts against the feeding port 14, and a closed space is formed between the cavity of the die casting mold, the barrel 12 and the melting cavity. At this time, the vacuumizing device of the vacuum melting mechanism 4 can make the closed space in a vacuum or high-vacuum environment after operation, and the subsequent melting and pouring operations of the amorphous alloy can be carried out in the vacuum or high-vacuum environment. When the barrel 12 or the injection rod 21 or other parts near the barrel 12 need to be maintained or replaced, the vacuum melting mechanism 4 can be separated from the barrel 12 by using the lifting mechanism, so as to provide an operation space for the maintenance and replacement operations, and the die casting system is more convenient to use and maintain.

[0047] It should be noted that one of the purposes of the utility model is to provide a die casting system which is more convenient to use and maintain, and the specific structure of the vacuum melting mechanism 4 and the sealing end cover 13 and the specific process of realizing sealing and vacuumizing are not the innovative parts of the utility model, and thus will not be described herein.

[0048] In the embodiment, the lifting mechanism comprises a driving device 32, a first guide 33, a lifting support 34, a second guide 35 and the mounting plate 31. Please refer to Figure 2 、 Figure 6a and Figure 6b , wherein the driving device 32 is fixedly connected to the head plate 11 and has an output end 36 capable of moving up and down, and the output end 36 will move up or down when the driving device 32 is working. The lifting support 34 is connected to the output end 36 and can move up and down with the output end 36. The first guide 33 is fixed to the head plate 11, and the second guide 35 is fixed to the lifting support 34, and the first guide 33 and the second guide 35 are vertically slidably connected. The mounting plate 31 is fixed to the second guide 35.

[0049] When the output end 36 of the driving device 32 moves up and down, the mounting plate 31 can move up and down through the lifting support 34 and the second guide 35, and the vacuum melting mechanism 4 on the mounting plate 31 can also move up and down. The first guide 33 and the second guide 35 can further limit the movement direction of the vacuum melting mechanism 4, prevent it from moving in a direction other than up and down or deflecting during use, and thus affect the sealing between the vacuum melting mechanism 4 and the barrel 12.

[0050] Further, in the embodiment, the driving device 32 is two lifting cylinders separately arranged on both sides of the vacuum melting mechanism 4; the lifting mechanism comprises two sets of symmetrical first guides 33, second guides 35 and mounting plates 31. As shown in Figure 2 、 Figure 6a and Figure 6b , the first guide 33, the second guide 35, the mounting plate 31 and the lifting cylinder are arranged above the left and right sides of the vacuum melting mechanism 4. When the two lifting cylinders operate synchronously in this structure, the balance in the horizontal direction of the two sides of the vacuum melting mechanism 4 is ensured, which can drive the vacuum melting mechanism 4 to move strictly in the up and down direction, and ensure that it has good airtightness with the barrel 12 during die casting operation. The lifting cylinder can be a cylinder, a hydraulic cylinder, an electric telescopic cylinder or other equipment capable of telescoping in one direction in specific applications.

[0051] Further, in the embodiment, as shown in Figure 2 、 Figure 6a and Figure 6b , the second guide 35 is a plate member with a slot 37, and the first guide 33 is a plate member with one end extending into the slot 37. They can only slide vertically relative to each other, and the plate and the slot are in surface contact, which makes the relative sliding more stable, ensuring that the vacuum melting mechanism 4 can move smoothly and maintain good airtightness with the barrel 12.

[0052] In other embodiments, the first guide 33 can also be a plate with a slot, and the second guide 35 can be a plate with one end extending into the slot. Alternatively, other structures capable of vertical guiding can be used, such as a sleeve sliding up and down along a rod, a slider sliding up and down along a slot, etc., all of which can achieve the function of moving the vacuum melting mechanism strictly in the downward direction.

[0053] In this embodiment, the two lifting cylinders in the lifting mechanism are arranged above the two sides of the vacuum melting mechanism 4, the lifting bracket 34 is arranged above the lifting cylinders, and the first guide 33, the second guide 35, and the mounting plate 31 are located between the vacuum melting mechanism 4 and the lifting bracket 34. This structure does not affect other structures in the die casting system, ensuring that the die casting system can operate smoothly.

[0054] In this embodiment, a sealing groove 16 is formed around the inlet 14 of the barrel 12, and the sealing member 42 is a sealing rubber ring with a shape matching the sealing groove 16. As shown in Figure 4 , the barrel 12 has a cylindrical structure, and the inlet 14 is arranged on one side wall. The outer periphery of the inlet 14 forms a stepped sealing groove 16 relative to the barrel wall, and the bottom surface of the sealing groove 16 is flat. When the vacuum melting mechanism 4 is lowered and the outlet 41 is connected to the inlet 14, the sealing rubber ring tightly abuts against the sealing groove 16, achieving airtight connection between the vacuum melting mechanism 4 and the barrel 12.

[0055] In this embodiment, a recess 17 is formed on the head plate 11, and one end of the vacuum melting mechanism 4 is arranged in the recess 17. As shown in Figure 1 , Figure 6a and Figure 6b , the side surface of the head plate 11 near the vacuum melting mechanism 4 is recessed inward to form a recess 17, Figure 3a , the left end of the vacuum melting mechanism 4 is located in the recess 17. Compared with traditional die casting systems, this structure can move the vacuum melting mechanism 4 as a whole to the side of the mold of the die casting system. During the injection operation, the structure of the shot cylinder 22 and other material handling systems is less likely to interfere with the vacuum melting mechanism 4, ensuring that the die casting operation can proceed normally. Further, as shown in Figure 3a and Figure 3b , the inlet 14 of the barrel 12 is also arranged at the position of the recess 17 of the head plate 11. Since the vacuum melting mechanism 4 as a whole moves to the side of the mold of the die casting system, the outlet 41 thereon and the inlet 14 of the barrel 12 can also move to the side of the mold, i.e., the flow distance of the material to be die cast into the mold is shortened, which helps to improve the quality of the die castings.

[0056] In the embodiment, the injection cylinder 22 of the injection mechanism is connected to the platen 18, and the platen 18 and the head plate 11 are connected by three connecting rods 19. Two of the connecting rods 19 are symmetrically arranged at the lower part of the platen 18 and the head plate 11, and the other connecting rod 19 is eccentrically arranged at the upper part of the platen 18 and the head plate 11. Please refer to Figure 8 and Figure 9 The platen 18 connected to the head plate 11 by the connecting rods 19 has good stability, and the injection mechanism arranged between the platen 18 and the head plate 11 can smoothly push the injection rod 21 to move during the injection operation. In the conventional die casting system, two symmetric connecting rods 19 are arranged between the platen 18 and the head plate 11, and the two connecting rods 19 at the upper part are usually close to each other. The connecting rod 19 in this structure is easy to interfere with the vacuum melting mechanism 4 and affect the operation of the lifting mechanism. Therefore, in the embodiment, based on the arrangement of the vacuum melting mechanism 4 and the lifting mechanism, only one connecting rod 19 is arranged at the upper part between the platen 18 and the head plate 11, and the connecting rod 19 is offset by a predetermined distance to the side of the vertical center line of the platen 18, so as to ensure that it does not interfere with the vacuum melting mechanism 4 and the lifting mechanism and can maintain the stability of the connection between the platen 18 and the head plate 11.

[0057] In an embodiment, the distance by which the connecting rod 19 is offset to the side of the vertical center line of the platen 18 is D, the width of the platen 18 is W, the diameter of the mounting bolt of the connecting rod 19 is d, and 2D+d≤W, 1 / 8W≤D≤1 / 6W. Within this range of values, the connecting rod 19 at the upper part can avoid the activity range of the lifting mechanism and the vacuum melting mechanism 4, while ensuring that the platen 18 and the head plate 11 have good connection stability.

[0058] In the die casting system in the embodiment, in order to maintain the basic vacuum operation environment and ensure that the parts near the barrel 12 are easy to maintain and replace, the vacuum melting mechanism 4 capable of moving up and down is arranged. Therefore, the vacuum melting mechanism 4 and the barrel 12 are not integrated, and there is a connection gap between them. In order to ensure the airtightness between them during die casting, a sealing groove 16 is arranged at the feeding port 14 of the barrel 12, and cooperates with the sealing element 42 on the discharging port 41 of the vacuum melting mechanism 4, so as to ensure that the airtightness between them during the die casting operation is good. In addition, the structure of the injection rod 21 is improved, and the sealing end cover 13 only slides with the middle section 212 of the injection rod 21, avoiding the joint of the injection rod 21 and the sealing end cover 13 from being rubbed to reduce the sealing performance. Under the joint action of these technical features, the vacuum or high-vacuum environment provided by the vacuum melting mechanism 4 can be maintained for a long time during the die casting operation, and finally a die casting part with good quality is obtained.

[0059] It is apparent for a person skilled in the art that the present application is not restricted to the details of the above exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary only, and not limiting, the scope of the present application being defined by the appended claims rather than the above description, and all changes coming within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims concerned.

Claims

1. A pressure injection mechanism, characterized in that, include: The injection rod includes an injection punch, a fixed section, and an intermediate section. The two ends of the intermediate section are provided with reverse threads, and the two ends of the intermediate section are respectively threaded to the injection punch and the fixed section. The injection cylinder has its output end connected to the fixed section. A barrel is fitted onto the injection rod, and an end cap is provided at the outer end; The injection punch is slidably disposed in the pressure chamber of the barrel, and the middle section is in slidable contact with the end cap.

2. The injection mechanism as described in claim 1, characterized in that, The length of the middle section is greater than the length of the injection punch and the length of the fixed section. During the injection stroke of the injection rod, only the middle section slides in contact with the end cap.

3. The injection mechanism as described in claim 1, characterized in that, The outer surface of the middle section has undergone surface roughening treatment.

4. The injection mechanism as described in claim 1, characterized in that, The end cap is a sealed end cap, and only the middle section of the injection rod is dynamically sealed to the sealed end cap.

5. A die-casting system, characterized in that, include: The injection mechanism as described in any one of claims 1 to 4; The die-casting mechanism has a mounting position at the head plate that can accommodate the material cylinder; The lifting mechanism, fixed to the head plate, has a mounting plate that can move up and down; A vacuum melting mechanism is provided on the mounting plate, with the outlet of the melting chamber facing the inlet of the material cylinder, and a sealing element that can be connected to the inlet of the material cylinder is provided on the outlet. When the mounting plate moves downward to the preset position, the sealing element is connected to the feed port, forming a sealed space between the die-casting mold cavity, the barrel, and the melting chamber.

6. The die-casting system as described in claim 5, characterized in that, The lifting mechanism includes: The drive unit, fixed to the head plate, has an output end that can move up and down; The first guide member is fixed to the head plate; The lifting bracket is connected to the output end; The second guide component is fixed on the lifting bracket and is vertically slidably connected to the first guide component; The mounting plate is fixed to the second guide member.

7. The die-casting system as described in claim 6, characterized in that, The driving device consists of two lifting cylinders located on both sides of the vacuum melting mechanism. The lifting mechanism includes two sets of symmetrical first guide members, second guide members, and mounting plates.

8. The die-casting system as described in claim 5, characterized in that, A recess is formed on the head plate, and one end of the vacuum melting mechanism is located in the recess; the feed inlet of the material cylinder is located in the recess.

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