A two-dimensional side volume compression plunger device

Abstract

The application discloses a two-dimensional lateral volume compression injection device and belongs to the technical field of pressure casting and injection molding equipment. The technical scheme is as follows: a two-dimensional lateral volume compression injection device, which comprises a compression chamber front plate, a compression chamber back plate, a plurality of pull rods and a plurality of injection blocks, the compression chamber front plate and the compression chamber back plate are locked and connected through the pull rods, the plurality of injection blocks are clamped between the two plates and form a compression chamber by being surrounded, the compression chamber is communicated with a cavity through a sprue, at least one of the injection blocks is driven, and the rest of the injection blocks are connected through a mechanical linkage, so that the cross-sectional area of the compression chamber is synchronously reduced in two mutually perpendicular lateral directions. The two-dimensional lateral volume compression injection device realizes the rapid reduction of the volume of the compression chamber by simultaneously shrinking in two lateral directions, the effective length of the compression chamber can be greatly shortened under the same volume of the compression chamber, the high-power accumulator is cancelled, the injection blocks only make short-distance translation, the wear is extremely small, the service life is long, and a 'fast first and slow later' injection curve is naturally formed.

Description

Technical Field

[0001] This invention belongs to the technical field of pressure casting and injection molding equipment, specifically relating to an injection device for two-dimensional lateral volume compression. Background Technology

[0002] In die casting and semi-solid molding processes, the molten metal filling process relies on an injection device to inject molten metal into the mold cavity at high speed and high pressure to achieve precise product forming. Current mainstream equipment adopts an axial filling structure, its core consisting of a cylindrical injection punch and a straight-cylinder pressure chamber. The punch reciprocates along the chamber axis, pushing the molten metal to complete filling and compaction. In practice, when the output thrust of the injection punch is constant, increasing the hydraulic pressure of the molten metal in the cavity requires reducing the diameter of the punch and pressure chamber; however, with a reduced diameter, to ensure sufficient molten metal filling, the length of the pressure chamber and the stroke of the punch must be significantly extended, leading to a significant increase in equipment complexity. This long-stroke axial design causes multiple technical bottlenecks in actual engineering. Equipment manufacturing costs remain high because the long stroke requires the punch to complete filling in a very short time before the molten metal solidifies, demanding stringent requirements on movement speed and response accuracy. This forces the equipment to integrate high-power, high-speed accumulators, high-precision servo drive units, and complex hydraulic and electrical control systems, significantly increasing the number of parts and the overall cost. Meanwhile, the reliability of components is severely compromised under high temperature and high pressure conditions. The long contact stroke between the pressure chamber and the punch is prone to axial bending deformation and uneven stress distribution under continuous thermal load and mechanical stress. The punch frequently rubs against the inner wall of the pressure chamber during reciprocating motion, accelerating surface wear and even causing cracking and jamming, significantly shortening the service life of the equipment. In addition, the processing and maintenance are particularly difficult. The long-stroke pressure chamber and the slender punch have extremely stringent requirements for coaxiality and fit clearance, resulting in a low machining yield. The fit clearance is prone to exceed tolerances during equipment operation, and daily maintenance requires frequent disassembly, replacement, and calibration, which is cumbersome and affects the continuity of production.

[0003] To address these shortcomings, the industry has attempted to develop improved solutions. For example, patent application CN202610633809.0 proposes a single-dimensional lateral compression injection device, which shortens the chamber length through lateral extrusion in a single direction. However, its filling speed is only linearly related to the speed of movement in that direction, failing to overcome the process contradiction between shortening the stroke and increasing the filling rate. The chamber shortening is limited, and it still relies on a high-power drive system. In the fields of powder metallurgy and extrusion casting, patent application CN202111411011.5 employs multi-directional radial compression technology. However, such solutions are mainly aimed at powder cavities or dense forming of solid materials. Their block linkage mechanism and force characteristics are difficult to adapt to the high-speed filling requirements of liquid metals. They usually require complex program control to achieve high-speed filling and low-speed pressurization in stages, and cannot naturally generate an ideal injection curve through structural geometry.

[0004] More importantly, existing solutions generally fail to address the wear and jamming risks caused by long-stroke sliding friction, resulting in limited improvements in component reliability. Traditional axial structures and existing lateral compression technologies have significant shortcomings in terms of chamber length optimization, system simplification, wear suppression, and process implementation. There is an urgent need for an innovative structural design that can significantly shorten the chamber length through a mechanical adaptive mechanism, while simultaneously achieving a simple and reliable method for changing the filling speed from fast to slow, and effectively reducing component wear and maintenance complexity. Summary of the Invention

[0005] The present invention provides a two-dimensional lateral volumetric compression injection device to solve at least one of the above-mentioned technical problems.

[0006] The technical solution adopted in this invention is as follows: A two-dimensional lateral volume compression injection device includes a front plate of a pressure chamber for fitting against the rear end face of a fixed mold; a rear plate of a pressure chamber opposite to the front plate; a plurality of tie rods for locking the front plate and the rear plate together; and a plurality of injection blocks clamped between the front and rear plates to form a pressure chamber, the pressure chamber being connected to a cavity via a gating system; wherein the plurality of injection blocks can be driven to simultaneously translate towards the center of the pressure chamber along two mutually perpendicular lateral directions, both perpendicular to the axis of the pressure chamber, so that the cross-sectional area of ​​the pressure chamber decreases synchronously in the two lateral dimensions, thereby pressing the molten metal in the pressure chamber into the cavity via the gating system.

[0007] Furthermore, this application also proposes that there are at least four of the aforementioned injection blocks, which together form a pressure chamber with a quadrilateral cross-section.

[0008] Furthermore, this application also proposes that two adjacent injection blocks are fitted together by an inclined surface, the inclined surface being configured such that when one of the injection blocks translates along a first lateral direction, the other adjacent injection block translates synchronously along a second lateral direction under the push of the inclined surface.

[0009] Furthermore, this application also proposes that the inclined surface is at a 45° angle to the direction of movement of the corresponding injection block.

[0010] Furthermore, this application also proposes that it further includes a compression spring and a spring seat, the compression spring being disposed between the spring seat and the injection block, the spring restoring force keeping the inclined surfaces between adjacent injection blocks in contact.

[0011] Furthermore, this application also proposes that the injection block is provided with a spring guide rod, which is slidably inserted into the spring seat.

[0012] Furthermore, this application also proposes that the pull rod is provided with a rollable copper sleeve, the injection block and the pull rod are slidably engaged through the copper sleeve, and the pull rod also serves as a translation guide for the injection block.

[0013] Furthermore, this application also proposes to include an injection block drive source, which acts on at least one of the injection blocks to drive the injection blocks to translate simultaneously along the two mutually perpendicular lateral directions.

[0014] Furthermore, this application also proposes that the injection block includes two transverse injection sections arranged opposite each other along a first lateral direction and two vertical injection sections arranged opposite each other along a second lateral direction. A guide rail is provided between the front plate of the pressure chamber and the rear plate of the pressure chamber. The transverse injection sections and the vertical injection sections are slidably engaged with the guide rail. The transverse injection sections are directly driven by the injection block drive source and the vertical injection sections are moved synchronously towards the center of the pressure chamber by the inclined surface.

[0015] Furthermore, this application also proposes that the cross-sectional area of ​​the pressure chamber decreases nonlinearly with the increase of the displacement of the injection block, so that the filling speed of the molten metal is higher in the early stage of filling and lower in the late stage of filling, thereby forming an injection curve that is fast at first and slow at the end.

[0016] Due to the adoption of the above technical solution, the beneficial effects achieved by this invention are as follows: 1. The axial length of the pressure chamber is significantly shortened, resulting in a substantial reduction in equipment cost and system complexity. Two-dimensional lateral synchronous compression makes the rate of change of the pressure chamber cross-sectional area proportional to the product of the velocities in the two lateral directions. The equivalent filling speed is much higher than that of traditional unidirectional axial filling and single-dimensional lateral compression methods. Under the same pressure chamber volume requirements, the effective length of the pressure chamber can be shortened to one-tenth or even less than that of traditional axial structures. This eliminates the need for high-power, high-speed accumulators, reduces reliance on long-stroke, high-response drive systems, and significantly reduces the overall design, processing, and assembly costs.

[0017] 2. Minimal component wear significantly improves service life and production stability. The injection block only moves a short distance perpendicular to the pressure chamber wall, completely eliminating the scraping wear and jamming risks caused by long-stroke sliding friction between the traditional punch and the pressure chamber; the tie rod also serves as a translation guide for the injection block, ensuring that it maintains a precise movement trajectory and good parallelism during high-speed, high-pressure translation, further extending the overall service life of the injection system and significantly reducing maintenance frequency and difficulty.

[0018] 3. The drive system is simple and reliable, with high motion synchronization and control precision. At least four injection blocks surround a quadrilateral cross-section pressure chamber, resulting in a clear structure and well-defined motion trajectory, simplifying the design of the drive mechanism. Adjacent injection blocks are linked together by inclined planes, requiring only the driving of a portion of the injection blocks to propel the remaining blocks synchronously towards the center along mutually perpendicular lateral directions, forming a precise 1:1 linkage relationship. This significantly simplifies the drive system and control logic, reduces manufacturing costs, and ensures that the cross-sectional area of ​​the pressure chamber decreases uniformly and synchronously, avoiding uneven filling and casting defects.

[0019] 4. Excellent sealing and operational stability. The compression spring provides a continuous preload force towards the center of the pressure chamber to the injection block via the spring seat. The injection block is equipped with a spring guide rod that can slide through the spring seat. This preload force ensures that the injection block remains tightly fitted during movement and resetting, effectively preventing molten metal leakage, compensating for machining and assembly errors, ensuring uniformity and long-term stable operation during the filling process, and preventing the compression spring from skewing and becoming unstable, thus extending the life of related components.

[0020] 5. Naturally forming an optimal "fast then slow" injection curve results in high-quality castings. The cross-sectional area of ​​the pressure chamber decreases non-linearly with the increase of the injection block displacement. The molten metal filling speed is higher in the early stage of filling and lower in the late stage. In the early stage, the high speed ensures that the molten metal quickly fills all corners of the mold cavity, avoiding cold shuts and incomplete filling. In the late stage, the low speed reduces the impact of the molten metal on the cavity, preventing flash and porosity. At a constant driving power, a greater extrusion force is generated, resulting in a more uniform and dense structure of the molded part, better mechanical properties, and extended mold life.

[0021] 6. High structural scalability and compatibility. The number of injection blocks, the angle of the bevel, the driving combination method, and the cross-sectional shape can all be flexibly adjusted as needed, adapting to different injection molding equipment and product requirements, and has a wide range of applications. Attached Figure Description

[0022] Figure 1 This is one of the three-dimensional structural diagrams of the two-dimensional lateral volume compression injection device in a specific embodiment of the present invention; Figure 2 This is a schematic diagram of the two-dimensional lateral volume compression principle and the enclosed structure of four injection blocks in a specific embodiment of the present invention; Figure 3 This is one of the schematic diagrams of the exploded structure of the two-dimensional lateral volume compression injection device in a specific embodiment of the present invention; Figure 4 This is a schematic diagram of the two-dimensional lateral volume compression injection device in a specific embodiment of the present invention; Figure 5This is the second three-dimensional structural diagram of the two-dimensional lateral volume compression injection device in a specific embodiment of the present invention; Figure 6 This is a schematic diagram of the two-dimensional lateral volume compression principle and the enclosed structure of the lateral injection section and the vertical injection section in a specific embodiment of the present invention. Figure 7 This is the second schematic diagram of the exploded structure of the two-dimensional lateral volume compression injection device in a specific embodiment of the present invention; Figure 8 This is a schematic diagram of the cross-section and displacement changes of the inner cavity of the injection block in a specific embodiment of the present invention; Figure 9 This is a graph showing the change in pressure chamber volume with the displacement of the injection block in a specific embodiment of the present invention.

[0023] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0024] In the attached diagram: 1. Front plate of pressure chamber; 2. Rear plate of pressure chamber; 3. Tie rod; 4. Injection block; 5. Pressure chamber; 6. Sprue; 7. Cavity; 8. Injection block drive source; 9. Compression spring; 10. Spring seat; 11. Spring guide rod; 12. Guide rail; 13. Horizontal injection section; 14. Vertical injection section. Detailed Implementation

[0025] To more clearly illustrate the overall concept of the present invention, a detailed description will be provided below with reference to the accompanying drawings and examples.

[0026] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0027] Furthermore, in the description of this invention, it should be understood that the terms "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 invention.

[0028] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "aspect," "specific example," or "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] In molten metal filling processes such as die casting and semi-solid molding, traditional axial filling structures generally suffer from high equipment manufacturing costs, complex drive systems, severe component wear, short service life, difficult processing and maintenance, and poor production stability. Existing lateral compression schemes have also failed to fundamentally resolve the contradiction between filling speed and pressure chamber length, and still rely on high-response drive systems. Furthermore, the risk of wear and jamming caused by long-stroke sliding friction remains.

[0031] In this regard, refer to Figures 1-8 This application proposes a two-dimensional lateral volume compression injection device, including a front plate 1 of the pressure chamber, a rear plate 2 of the pressure chamber, a plurality of tie rods 3 and a plurality of injection blocks 4. The front plate 1 and the rear plate 2 of the pressure chamber are locked together by the tie rods 3. The plurality of injection blocks 4 are clamped between the front plate 1 and the rear plate 2 of the pressure chamber and enclose to form a pressure chamber 5. The pressure chamber 5 is connected to the cavity 7 through the gating 6. The plurality of injection blocks 4 can be driven to simultaneously translate towards the center of the pressure chamber 5 along two mutually perpendicular lateral directions, both perpendicular to the axis of the pressure chamber 5, so that the cross-sectional area of ​​the pressure chamber 5 decreases synchronously in the two lateral directions, thereby pressing the molten metal in the pressure chamber 5 into the cavity 7 through the gating channel 6.

[0032] This structure aims to significantly shorten the length of the pressure chamber and achieve high-speed filling and low-speed pressurization of molten metal in a simple and reliable manner, while reducing wear and maintenance difficulty.

[0033] For ease of understanding, the following explains some key terms in this embodiment: The front plate 1 and the rear plate 2 of the pressure chamber are two main components that make up the main frame of the injection device. They are locked together by the tie rod 3 and together provide a clamping and support structure for the injection block 4.

[0034] The tie rod 3 is used to connect and lock the front plate 1 of the pressure chamber and the rear plate 2 of the pressure chamber to ensure the structural stability and sealing of the injection device in the working state.

[0035] The injection block 4 is a component that comes into direct contact with the molten metal and applies pressure to it. It compresses the volume of the pressure chamber 5 through translational movement.

[0036] The pressure chamber 5 is a space formed by several injection blocks 4 to contain molten metal, where the molten metal is compressed and forced into the cavity 7.

[0037] The gating 6 is a channel connecting the pressure chamber 5 and the cavity 7. The molten metal enters the cavity 7 from the pressure chamber 5 through the gating 6.

[0038] Cavity 7 is the space in the mold used to form the final shape of the casting. The molten metal is pressed into cavity 7 and then solidifies there.

[0039] "Two mutually perpendicular lateral directions, both perpendicular to the axis of the pressure chamber 5" refers to the planar directions of the movement of the injection block 4. These directions are orthogonal to the central axis of the pressure chamber 5 and are at a 90-degree angle to each other, ensuring that the cross-sectional area of ​​the pressure chamber 5 can be compressed simultaneously from multiple sides.

[0040] "Translation" refers to the linear movement of the injection block 4 in the aforementioned lateral direction, without rotation or tilting.

[0041] "Synchronous reduction of cross-sectional area" means that during the translation of the injection block 4, the size of the pressure chamber 5 decreases simultaneously in two lateral directions, thereby achieving effective compression of the volume of the pressure chamber 5.

[0042] The injection device of this embodiment includes a front plate 1 of the pressure chamber, a rear plate 2 of the pressure chamber, several tie rods 3, and several injection blocks 4. The front plate 1 and the rear plate 2 of the pressure chamber can be designed as plate structures with sufficient strength and rigidity, for example, made of high-strength alloy steel, to withstand the enormous pressure during the injection process. The tie rods 3 can be in the form of bolts or pins, passing through corresponding holes on the front plate 1 and the rear plate 2 of the pressure chamber, and are fixed by nuts or other locking mechanisms, thereby firmly connecting the front plate 1 and the rear plate 2 of the pressure chamber together. The injection blocks 4 can be made of wear-resistant and high-temperature resistant materials, such as hot work die steel, and their number can be configured according to the geometric requirements of the pressure chamber 5, for example, three, four or more can be configured to enclose pressure chambers 5 of different shapes.

[0043] The front plate 1 and the rear plate 2 of the pressure chamber are locked together by tie rods 3, forming a stable frame structure. This connection method ensures that the pressure chamber 5 can withstand high pressure without deformation or leakage during the injection process. For example, the tie rods 3 can be evenly distributed around the perimeter of the front plate 1 and the rear plate 2 of the pressure chamber, and the two plates are tightly joined together by pre-tightening force.

[0044] Several injection blocks 4 are clamped between the front plate 1 and the rear plate 2 of the pressure chamber, forming a pressure chamber 5. The sides of the injection blocks 4 can be designed as smooth planes or curved surfaces, which, when they are close to each other, collectively define the internal space of the pressure chamber 5. For example, four independent injection blocks 4 can be used, with their inner sides forming a pressure chamber 5 with a square or circular cross-section. Appropriate gaps can be left between the injection blocks 4 and the front plate 1 and the rear plate 2 of the pressure chamber to allow the injection blocks 4 to translate.

[0045] The pressure chamber 5 is connected to the mold cavity 7 via the runner 6. The runner 6 can be one or more channels, and its shape and size can be designed according to the flow characteristics of the molten metal and the filling requirements. For example, the runner 6 can be a tapered channel, with its small end connected to the pressure chamber 5 and its large end connected to the mold cavity 7, to guide the molten metal smoothly into the mold cavity 7. The mold cavity 7 is the core part of the mold, and its internal shape corresponds to the shape of the final casting.

[0046] The injection blocks 4 can be driven to simultaneously translate towards the center of the pressure chamber 5 along two mutually perpendicular lateral directions, both perpendicular to the axis of the pressure chamber 5. To achieve this translation, each injection block 4 can be equipped with an independent drive mechanism, such as a hydraulic cylinder or a servo motor. These drive mechanisms can act on each injection block 4 separately, causing it to move independently in its respective lateral direction. By precisely controlling these independent drive mechanisms, the simultaneous translation of the injection blocks 4 towards the center of the pressure chamber 5 can be achieved. For example, when four injection blocks 4 are used to form a square pressure chamber 5, a hydraulic cylinder can be configured for each injection block 4, with the piston rod of the hydraulic cylinder connected to the injection block 4, and the injection block 4 can be moved along a preset direction by the actuation of hydraulic oil.

[0047] Therefore, the cross-sectional area of ​​pressure chamber 5 decreases synchronously in both lateral directions. When the injection blocks 4 translate towards the center of pressure chamber 5, the boundaries of pressure chamber 5 contract inward, resulting in a decrease in its cross-sectional area. Because the injection blocks 4 translate simultaneously in two mutually perpendicular lateral directions, the cross-sectional area of ​​pressure chamber 5 contracts synchronously in these directions. For example, if pressure chamber 5 is initially a square cross-section, when the four injection blocks 4 move towards the center simultaneously, the side lengths of the square will decrease synchronously, thus causing the cross-sectional area of ​​pressure chamber 5 to continuously decrease.

[0048] Finally, the molten metal in the pressure chamber 5 is forced into the mold cavity 7 through the gating system 6. As the cross-sectional area of ​​the pressure chamber 5 decreases, its volume is compressed, thus applying pressure to the molten metal within. Under this pressure, the molten metal is injected into the mold cavity 7 at high speed and high pressure through the gating system 6, completing the filling process. For example, as the injection block 4 continues to move towards the center, the molten metal in the pressure chamber 5 is squeezed, and its pressure rapidly increases until it is sufficient to overcome the resistance of the gating system 6 and the mold cavity 7, completely filling the mold cavity 7 with molten metal.

[0049] This embodiment of the two-dimensional lateral volume compression injection device achieves a synchronous reduction in the cross-sectional area of ​​the pressure chamber 5 by simultaneously translating multiple injection blocks 4 along two mutually perpendicular lateral directions toward the center of the pressure chamber 5, thereby efficiently injecting molten metal into the mold cavity 7. This structure significantly shortens the axial length of the pressure chamber 5, reduces reliance on long-stroke drive systems, and helps reduce equipment manufacturing costs and system complexity. Simultaneously, the lateral movement of the injection blocks 4 reduces frictional wear between the traditional axial punch and the pressure chamber wall, improving component lifespan and production stability, and simplifying maintenance procedures. Compared to a single-dimensional lateral compression scheme, this application compresses the pressure chamber volume simultaneously from two dimensions. In single-dimensional compression, the filling speed is proportional to the injection block moving speed v; while in the two-dimensional compression of this application, the speeds in the x and y directions are denoted as vx and vy, respectively. x and v y By using inclined plane linkage to make v y =k·v x The rate of change of cross-sectional area and v x ·v y Proportional to v x The speed is proportional to 2 and much faster than single-dimensional compression, thus achieving a doubling of the equivalent filling speed and further shortening the compression chamber length.

[0050] Reference Figures 1-4As a preferred embodiment of the arrangement of the injection blocks 4, this application further proposes a pressure chamber 5 with at least four injection blocks 4 enclosing a quadrilateral cross-section. The number of injection blocks 4 is a key element in achieving two-dimensional lateral volume compression. When the number of injection blocks 4 is at least four, the pressure chamber 5 can be effectively surrounded and compressed in two mutually perpendicular lateral directions. For example, four injection blocks 4 can be used, corresponding to the four sides of the pressure chamber 5 respectively, and synchronous translation can be achieved through their respective driving or linkage mechanisms. In addition, more than four injection blocks 4 can be used, such as six or eight, to form a pressure chamber cross-section that is closer to a circle, or to provide finer compression control in specific applications, but at least four injection blocks 4 are the basic configuration for achieving two-dimensional lateral compression. The cross-sectional shape of the pressure chamber 5 directly affects the filling path and injection efficiency of the molten metal. When the pressure chamber 5 is enclosed to form a quadrilateral cross-section, such as a square or rectangular cross-section, it can form a good correspondence with the configuration of at least four injection blocks 4. This quadrilateral cross-section structure simplifies the layout and movement trajectory of the injection block 4, making the synchronous translation of the injection block 4 along two mutually perpendicular lateral directions more direct and easier to control. At the same time, the geometric characteristics of the quadrilateral cross-section pressure chamber 5 also facilitate the connection with the gating system 6 and the cavity 7, ensuring that the molten metal can be efficiently and uniformly injected into the cavity 7.

[0051] By explicitly limiting the number of injection blocks 4 to at least four, and having these injection blocks 4 enclose a pressure chamber 5 with a quadrilateral cross-section, this application provides a two-dimensional lateral volume compression scheme with a clear structure and well-defined motion trajectory. Specifically, the configuration of at least four injection blocks 4, for example, with four injection blocks 4 corresponding to the four sides of the quadrilateral pressure chamber 5 respectively, makes the layout of the injection blocks 4 more regular and simplifies the design of the drive mechanism. When these injection blocks 4 synchronously translate towards the center of the pressure chamber 5 along two mutually perpendicular lateral directions, the quadrilateral cross-section pressure chamber 5 can ensure that the molten metal is subjected to uniform and stable pressure during compression, avoiding local stress concentration or uneven filling problems that may be caused by irregular cross-sections or an uncertain number of injection blocks 4. This explicit structural design not only improves the stability and controllability of the injection process, but also helps to optimize the filling speed and quality of the molten metal, thereby improving the performance of the final product.

[0052] Reference Figures 1-4 This application further proposes that two adjacent injection blocks 4 are attached to each other by an inclined surface, which is configured such that when one of the injection blocks 4 is translated in a first lateral direction, the other adjacent injection block 4 is translated synchronously in a second lateral direction under the push of the inclined surface.

[0053] Specifically, a "sloping surface" refers to a surface with a certain angle of inclination provided on the contact surface of two adjacent injection blocks 4. These slopes can be straight, curved, or a combination thereof, and their main function is to serve as an interface for force transmission and motion conversion. Through the interaction of these slopes, the motion of one injection block 4 can be decomposed or converted into the motion of another injection block 4. This contact method ensures stable contact and effective force transmission of the injection blocks 4 during movement, thereby avoiding gaps or jamming.

[0054] The inclined plane is configured such that when one of the injection blocks 4 translates along a first lateral direction, the adjacent injection block 4 is simultaneously translated along a second lateral direction under the push of the inclined plane. This configuration describes the specific function and motion conversion mechanism of the inclined plane. When an injection block 4 (e.g., a transverse injection section) is driven to translate along its preset first lateral direction (e.g., the X-axis direction), its inclined plane will contact the inclined plane of another adjacent injection block 4 (e.g., a vertical injection section) and generate a thrust. Due to the inclination angle of the inclined plane, this thrust will push the adjacent injection block 4 along its preset second lateral direction (e.g., the Y-axis direction), causing it to translate synchronously. This linkage mechanism allows for coordinated synchronous movement of all injection blocks 4 by driving only a portion of the injection blocks 4, thereby simplifying the drive system. The angle design of the inclined plane is key to achieving precise synchronous translation; for example, when the inclined plane is at 45° to the direction of movement, synchronous movement at the same speed in both directions can be achieved.

[0055] The above technical solution cleverly utilizes the principle of mechanical linkage by setting inclined planes between adjacent injection blocks 4 and using the pushing action of the inclined planes to achieve synchronous translation of the injection blocks 4. This design transforms the movement of multiple injection blocks 4, which originally required independent driving and complex synchronous control, into coordinated and synchronous movement that can be achieved by driving a few injection blocks 4. This significantly simplifies the drive system and control logic of the injection device, reduces the complexity of the mechanism and manufacturing cost, while improving the synchronicity and accuracy of the movement of the injection blocks 4, ensuring a uniform reduction in the cross-sectional area of ​​the pressure chamber 5, thereby achieving a more stable and efficient metal hydraulic injection process.

[0056] Reference Figures 1-4This application further proposes that the inclined surface forms a 45° angle with the direction of movement of the corresponding injection block 4. Here, the inclined surface refers to the surface between two adjacent injection blocks 4 that contacts each other and transmits motion. The direction of movement of the corresponding injection block 4 refers to the specific lateral translation direction in which the injection block 4 is driven or pushed during the injection process. Setting the angle between the inclined surface and the direction of movement of the injection block 4 at 45° means that the inclined surface presents a 45-degree inclination angle relative to the trajectory of the injection block 4. For example, if one injection block 4 translates along a first lateral direction, and another adjacent injection block 4 translates along a second lateral direction, then the inclined surface between them will form a 45-degree angle with both lateral directions. This precise geometric configuration can be achieved through precision machining of the contact surfaces of the injection blocks 4, ensuring the accuracy of motion transmission.

[0057] By setting the angle between the inclined plane and the corresponding injection block 4 at 45°, a precise 1:1 linkage relationship can be ensured between the translation of adjacent injection blocks 4 along the first lateral direction and their translation along the second lateral direction when driven. This geometric configuration makes the synchronous translation of the injection blocks 4 more accurate and stable, effectively avoiding problems such as asynchronous movement or low transmission efficiency caused by improper angles. Consequently, the cross-sectional area of ​​the pressure chamber 5 can decrease synchronously in a highly coordinated manner in two mutually perpendicular lateral directions, ensuring uniform pressure and stable filling of the molten metal during the injection process, significantly improving the operational reliability of the injection device and the quality of the castings.

[0058] Reference Figures 1-8 This application further proposes that the injection device also includes a compression spring 9 and a spring seat 10. The compression spring 9 is disposed between the spring seat 10 and the injection block 4, and the spring's restoring force keeps the inclined surfaces between adjacent injection blocks 4 in contact. The compression spring 9 is an elastic element capable of storing and releasing mechanical energy; it deforms under pressure and returns to its original shape after the pressure is released. The spring seat 10 is a structural component used to fix and support the compression spring 9, ensuring that the spring can stably provide force during operation. Specifically, the compression spring 9 is disposed between the spring seat 10 and the injection block 4 to provide a preload force towards the center of the pressure chamber 5 to the injection block 4. This arrangement allows the compression spring 9 to act directly on the injection block 4, providing it with a continuous elastic force pointing towards the center of the pressure chamber 5. The compression spring 9 can be in various forms, such as a helical spring, a disc spring, or a wave spring, depending on the required preload, space constraints, and working environment. The spring seat 10 is typically fixed to the front plate 1 or the rear plate 2 of the pressure chamber, or integrated into the frame structure of the device. Its design should ensure that the spring can work stably during compression and release and withstand the corresponding reaction force. The magnitude of the preload can be achieved by selecting springs with different stiffnesses, adjusting the initial compression of the spring, or adjusting the position of the spring seat 10.

[0059] Through the above technical solution, the preload force ensures that the injection block 4 always maintains an inward tendency when it is not fully driven by the main drive mechanism, or when the main drive mechanism stops working. This maintains the tight fit between the injection blocks 4 and the stable relationship with the center of the pressure chamber 5. The preload force continuously pushes the injection blocks 4 towards the center of the pressure chamber 5, ensuring a tight fit between the injection blocks 4 and between the injection blocks 4 and the pressure chamber 5, thereby significantly improving the sealing performance of the pressure chamber 5 and preventing leakage of molten metal during injection. Furthermore, the preload force also helps compensate for minor errors generated during machining and assembly, ensuring that the injection blocks 4 maintain a stable position and contact state throughout the entire injection stroke, improving the stability of the injection process and the uniformity of molten metal filling.

[0060] Reference Figures 1-4 This application further proposes that the injection block 4 is provided with a spring guide rod 11, which is slidably inserted into the spring seat 10.

[0061] Specifically, the spring guide rod 11 is a rod-shaped structure mounted on the injection block 4. Its main function is to provide stable support and a guiding path for the compression spring 9, ensuring that the compression spring 9 maintains axial movement during compression and release, and preventing lateral bending or deflection. The spring guide rod 11 can be an integrally formed protrusion on the injection block 4, or it can be a separate component fixed to the injection block 4, for example, by means of threaded connection, welding, or press-fit. Its material is typically a metal with good wear resistance and sufficient strength, such as stainless steel, alloy steel, or surface-hardened steel, to withstand repeated friction and pressure.

[0062] Meanwhile, the spring guide rod 11 is slidably inserted into the spring seat 10, meaning that the spring seat 10 has a hole or groove that mates with the spring guide rod 11. This sliding fit ensures that the spring guide rod 11 can smoothly reciprocate within the spring seat 10, while effectively limiting the lateral displacement of the compression spring 9. The clearance of the sliding fit should be precisely designed to ensure the smoothness of the spring guide rod 11 during movement and to effectively prevent unnecessary wobbling when under force. To further reduce friction and wear, a lubricant can be placed between the sliding mating surfaces, or a wear-resistant bushing made of a self-lubricating material (such as an oil-impregnated bearing or polymer bushing) can be inserted into the hole of the spring seat 10.

[0063] Through the above technical solution, a spring guide rod 11 is provided on the injection block 4 and slidably inserted into the spring seat 10, providing a stable and constrained guide path for the compression spring 9. This effectively avoids bending, skewing, or instability of the compression spring 9 during the translation of the injection block 4, ensuring that the compression spring 9 is always compressed and rebounded along its axial direction. Therefore, it can ensure that the preload applied by the compression spring 9 to the injection block 4 is more uniform and stable, significantly improving the smoothness of the movement and positioning accuracy of the injection block 4. At the same time, due to the presence of the spring guide rod 11, the friction and wear that may occur between the compression spring 9 and the spring seat 10 and the injection block 4 are reduced, thereby extending the service life of the compression spring 9 and related components, and improving the reliability and working efficiency of the entire injection device.

[0064] Reference Figures 1-4 This application further proposes that the pull rod 3 is equipped with a rollable copper sleeve, and the injection block 4 and the pull rod 3 are slidably engaged through the copper sleeve. The pull rod 3 also serves as a translational guide for the injection block 4. Specifically, the pull rod 3 not only functions to lock the front plate 1 and the rear plate 2 of the pressure chamber, but is also designed to provide precise motion guidance for the injection block 4. To achieve this dual function, the injection block 4 is provided with a rollable copper sleeve, guide hole, or guide groove that mates with the pull rod 3. The rollable copper sleeve and the pull rod 3 form a sliding fit, allowing the injection block 4 to move smoothly along the direction of the pull rod 3, while restricting its degree of freedom in the direction perpendicular to the pull rod 3, thereby ensuring that the injection block 4 always maintains the predetermined motion trajectory and posture during translation. The surface of the pull rod 3 can be precision machined to ensure that it has sufficient straightness and surface finish, thereby reducing frictional resistance and improving guiding accuracy. In addition, the material selection and heat treatment process of the pull rod 3 should also ensure that it has sufficient strength and wear resistance to withstand long-term high-frequency sliding friction.

[0065] Through the above technical solution, the tie rod 3 is also used as a translational guide for the injection block 4, effectively solving the problems of motion instability, jamming, or deviation from the trajectory that may occur during the high-speed, high-pressure translation of the injection block 4. As the skeleton of the device, the tie rod 3 itself possesses high strength and rigidity, providing solid and reliable guiding support for the injection block 4. This design ensures that the injection block 4 maintains a precise motion trajectory and good parallelism as it translates towards the center of the pressure chamber 5, thereby ensuring that the cross-sectional area of ​​the pressure chamber 5 decreases uniformly and synchronously, avoiding uneven filling or casting defects caused by unstable movement of the injection block 4. At the same time, this integrated design simplifies the device structure, reduces the number of parts, and lowers manufacturing costs and maintenance difficulty.

[0066] Reference Figures 1-4The present application further proposes that it also includes an injection block drive source 8, which acts on at least one injection block 4 to drive a plurality of injection blocks 4 to translate simultaneously along two mutually perpendicular lateral directions.

[0067] The injection block drive source 8 refers to the mechanism used to apply power to the injection blocks 4, causing them to move along a predetermined path. This drive mechanism can take various forms, such as hydraulic cylinders, pneumatic cylinders, servo motors with lead screw transmission mechanisms, cam mechanisms, or rack and pinion mechanisms. Its core function is to provide precise and synchronized driving force to ensure that several injection blocks 4 can simultaneously translate towards the center of the pressure chamber 5 along two mutually perpendicular lateral directions according to a preset trajectory and speed. The injection block drive source 8 can act on all injection blocks 4, or it can act on only some of the injection blocks 4, with the driven injection blocks 4 driving the remaining injection blocks 4 to move synchronously through mechanical linkage or other means.

[0068] By setting the injection block drive source 8, this application provides a specific power source and control means for the synchronous translation of the injection blocks 4. The injection block drive source 8 can precisely control several injection blocks 4 to move simultaneously towards the center of the pressure chamber 5 along two mutually perpendicular lateral directions, thereby achieving effective and uniform compression of the molten metal in the pressure chamber 5. This explicit driving mechanism ensures the stability and repeatability of the injection process, avoiding filling defects caused by uneven or asynchronous driving, such as under-casting, porosity, or shrinkage. In addition, through precise control of the injection block drive source 8, the injection speed and pressure curve can be adjusted according to different casting requirements, further optimizing the molten metal filling process and improving the quality and yield of castings.

[0069] Reference Figures 5-7 This application further proposes a preferred embodiment of the arrangement of the injection blocks 4. The injection blocks 4 include two transverse injection parts 13 arranged opposite each other in a first lateral direction and two vertical injection parts 14 arranged opposite each other in a second lateral direction. A guide rail 12 is provided between the front plate 1 and the rear plate 2 of the pressure chamber. The transverse injection parts 13 and the vertical injection parts 14 are slidably engaged with the guide rail 12. The transverse injection parts 13 are directly driven by the injection block drive source 8 and drive the vertical injection parts 14 to move synchronously toward the center of the pressure chamber 5.

[0070] Specifically, the injection blocks 4 are clearly divided into two transverse injection sections 13 arranged opposite each other along a first lateral direction and two vertical injection sections 14 arranged opposite each other along a second lateral direction. This configuration allows the injection blocks 4 to form a closed pressure chamber 5, and during the injection process, the transverse injection sections 13 and the vertical injection sections 14 move towards the center of the pressure chamber 5 along their respective lateral directions, thereby achieving a two-dimensional synchronous reduction of the cross-sectional area of ​​the pressure chamber 5. This layout is typically used to form pressure chambers 5 with rectangular or square cross-sections, ensuring that the contraction of the pressure chamber 5 occurs uniformly in both dimensions.

[0071] Meanwhile, a guide rail 12 is provided between the front plate 1 and the rear plate 2 of the pressure chamber. The guide rail 12 is a mechanical structure used to guide the smooth movement of the injection block 4. It can be fixed between the front plate 1 and the rear plate 2 of the pressure chamber, or directly integrated into the inner surface of the front plate 1 and the rear plate 2 of the pressure chamber. The guide rail 12 is designed to provide the injection block 4 with a precise movement trajectory and prevent it from deviating or jamming during translation. The material of the guide rail 12 is usually wear-resistant, high-strength alloy steel to withstand the wear and impact of the injection block 4 under high-speed movement and high pressure.

[0072] Based on this, both the transverse injection section 13 and the vertical injection section 14 are slidably engaged with the guide rail 12. Sliding engagement means that the transverse injection section 13 and the vertical injection section 14 achieve movement through sliding contact with the guide rail 12. This engagement ensures that the injection block 4, constrained by the guide rail 12, can only move in a preset lateral direction, without displacement or rotation in other directions. Sliding engagement can be achieved by providing grooves or sliders on the injection block 4 to match the protrusions or grooves on the guide rail 12. To reduce friction and wear, the sliding engagement surfaces can undergo surface treatments such as carburizing, nitriding, or coating with anti-friction materials. Lubricants can even be introduced, or rolling friction pairs can be used to further improve motion accuracy and lifespan.

[0073] Furthermore, the lateral injection section 13 is directly driven by the injection block drive source 8, which in turn drives the vertical injection section 14 to move synchronously towards the center of the pressure chamber 5. This technical feature describes the driving method and motion coordination mechanism of the injection blocks 4. The injection block drive source 8 directly applies force to the lateral injection section 13, causing it to move along the first lateral direction. Simultaneously, the lateral injection section 13 transmits motion to the vertical injection section 14 through mechanical coupling (e.g., through an inclined plane structure, linkage mechanism, or rack and pinion mechanism), thereby driving the vertical injection section 14 to move synchronously towards the center of the pressure chamber 5 along the second lateral direction. This strategy of "directly driving one part to drive another part" simplifies the complexity of the overall drive system, reduces the number of independent drive units required, and ensures the synchronous movement of all injection blocks 4 through ingenious mechanical design, thereby achieving precise and uniform contraction of the cross-sectional area of ​​the pressure chamber 5.

[0074] Through the above technical solution, several injection blocks 4 are clearly divided into two transverse injection sections 13 arranged opposite each other along the first lateral direction and two vertical injection sections 14 arranged opposite each other along the second lateral direction. A guide rail 12 is introduced to ensure that all injection blocks 4 can slide against the guide rail 12, thus providing a reliable mechanical constraint for the precise translation of the injection blocks 4. More importantly, by setting the injection block drive source 8 to directly drive only the transverse injection sections 13, and then having the transverse injection sections 13 drive the vertical injection sections 14 to move synchronously towards the center of the pressure chamber 5, the technical problem of how to achieve synchronous and coordinated movement of multiple injection blocks 4 under only partial driving force is effectively solved. This driving method significantly simplifies the structure of the drive system, reduces the number of drive components, and lowers the system complexity and manufacturing cost. At the same time, because the synchronicity of movement is guaranteed, the cross-sectional area of ​​the pressure chamber 5 can be reduced uniformly and stably, avoiding uneven filling of the molten metal or product defects caused by asynchronous movement of the injection blocks 4, thereby improving the stability of the injection process and the quality of the final product.

[0075] Reference Figure 8 and Figure 9 This application further proposes that the cross-sectional area of ​​the pressure chamber 5 decreases nonlinearly with the increase of the displacement of the injection block 4, so that the filling speed of the molten metal is higher in the early stage of filling and lower in the late stage of filling, thereby forming the desired ideal injection curve that is fast at the beginning and slow at the end.

[0076] Specifically, the non-linear decrease in the cross-sectional area of ​​the pressure chamber 5 with the increase of the displacement of the injection block 4 means that the relationship between the displacement of the injection block 4 and the decrease in the cross-sectional area of ​​the pressure chamber 5 during the translation process is not a simple linear proportion. This non-linear relationship can be achieved in several ways. For example, the surface in contact with the pressure chamber 5 can be designed with a specific curved shape or a stepped shape, so that when the injection block 4 translates at a constant speed, the cross-sectional area of ​​the pressure chamber 5 changes in a non-linear manner. Alternatively, the movement speed and acceleration of the injection block 4 can be precisely controlled by the injection block drive source 8 (such as a servo-controlled hydraulic cylinder or motor), so that it has different displacement rates at different stages, thereby achieving a non-linear decrease in the cross-sectional area of ​​the pressure chamber 5.

[0077] By employing the aforementioned nonlinear reduction method, the filling speed of the molten metal can be achieved to be higher in the initial stage of filling and lower in the final stage. The higher speed in the initial stage helps the molten metal quickly fill the distal region of the cavity 7, overcoming flow resistance and effectively preventing premature solidification during the filling process. The lower speed in the final stage allows for a smooth filling of the cavity 7, reducing the impact of the molten metal on the cavity wall, reducing turbulence, and thus avoiding defects such as porosity and air entrapment.

[0078] This variation in filling speed ultimately forms the desired ideal injection curve, which is initially fast and then gradually slows down. This curve describes the speed variation of the molten metal throughout the filling process, characterized by a high initial speed followed by a gradual decrease until the filling is complete.

[0079] Through the above technical solution, this application effectively solves the problems caused by improper control of filling speed in traditional injection molding processes. By precisely controlling the nonlinear reduction of the cross-sectional area of ​​the pressure chamber 5, the filling speed of the molten metal is optimized. Specifically, in the initial stage of filling, the cavity 7 is filled rapidly at a high speed, ensuring that the molten metal can quickly reach all corners of the cavity 7, effectively avoiding cold shuts and incomplete filling. In the final stage of filling, the filling speed decreases, which helps reduce the impact and wear of the molten metal on the mold cavity 7, reducing the risk of flash and porosity, while ensuring the density and surface quality of the casting. This fast-then-slow injection curve makes the injection process more refined and controllable, significantly improving the overall quality and production efficiency of the casting, and extending the service life of the mold.

[0080] The following example will provide a more detailed explanation of the above technical solution: In a die-casting production scenario, molten metal needs to be injected rapidly and stably into the mold cavity 7. Traditional axial injection devices suffer from high equipment costs, severe component wear, and complex maintenance due to their long stroke and reliance on high-precision drive systems. This example employs a two-dimensional lateral volumetric compression injection device to address these issues.

[0081] The core structure of this device includes a front plate 1 of the pressure chamber, a rear plate 2 of the pressure chamber, several tie rods 3, and several injection blocks 4. The front plate 1 and the rear plate 2 of the pressure chamber are securely connected by the tie rods 3, forming a stable frame. Inside this frame, at least four injection blocks 4 are clamped between the front plate 1 and the rear plate 2, forming a quadrilateral pressure chamber 5. The pressure chamber 5 is connected to the mold cavity 7 through a runner 6. The tie rods 3 not only provide locking force but also serve as translational guides for the injection blocks 4, ensuring the accuracy and stability of the injection blocks 4 during movement, thereby simplifying the structure and reducing the number of parts.

[0082] When an injection operation is required, molten metal is first injected into the pressure chamber 5. Then, the injection block drive source 8 begins operation. In this example, the injection block drive source 8 acts on two transverse injection sections 13 arranged opposite each other along a first lateral direction. A guide rail 12 is provided between the front plate 1 and the rear plate 2 of the pressure chamber. The transverse injection sections 13 and the two vertical injection sections 14 arranged opposite each other along a second lateral direction are all slidably engaged with the guide rail 12 to ensure smooth movement.

[0083] As the injection block drive source 8 pushes the lateral injection section 13 to translate towards the center of the pressure chamber 5 along the first lateral direction, the adjacent vertical injection section 14 also moves synchronously. This is achieved through the inclined surfaces between the injection blocks 4. Specifically, two adjacent injection blocks 4 are fitted together by inclined surfaces that form a 45° angle with the direction of movement of the corresponding injection block 4. When the lateral injection section 13 translates along the first lateral direction, its inclined surfaces push the adjacent vertical injection section 14 to translate synchronously towards the center of the pressure chamber 5 along the second lateral direction. This mechanical linkage allows all injection blocks 4 to simultaneously translate towards the center of the pressure chamber 5 along two mutually perpendicular lateral directions, both perpendicular to the axis of the pressure chamber 5, without requiring an independent drive system for each injection block, significantly reducing the complexity and cost of the drive system.

[0084] As the injection block 4 moves towards the center, the cross-sectional area of ​​the pressure chamber 5 decreases synchronously in both lateral directions, thereby forcing the molten metal in the pressure chamber 5 into the mold cavity 7 through the gating system 6. Compared with the traditional single-dimensional lateral compression scheme, this two-dimensional lateral compression method can achieve a larger volume change rate under the same injection block displacement, which allows the length of the pressure chamber 5 to be significantly shortened. This effectively solves the problem of excessively long pressure chambers in traditional axial filling structures and reduces the dependence on high-speed accumulators.

[0085] In addition, this device also includes a compression spring 9 and a spring seat 10. The compression spring 9 is disposed between the spring seat 10 and the injection block 4, and is used to provide a preload force to the injection block 4 toward the center of the pressure chamber 5. A spring guide rod 11 is provided on the injection block 4, and the spring guide rod 11 is slidably inserted in the spring seat 10. The presence of the preload force ensures that the injection block 4 is always in close contact during movement, reducing the risk of molten metal leakage, and helps to maintain the stable operation of the injection block 4, reducing the risk of wear and jamming caused by excessive gaps.

[0086] It is worth noting that the cross-sectional area of ​​the pressure chamber 5 decreases nonlinearly with the increase of the displacement of the injection block 4. This nonlinear design results in a higher filling speed of the molten metal in the early stage of filling and a lower speed in the later stage, thus naturally forming a fast-then-slow injection curve. The geometric characteristics of this structure enable the segmentation of the process between "high-speed filling" and "low-speed pressurization," avoiding the drawbacks of traditional schemes that require complex program control to achieve segmented injection, further simplifying the control system and improving the stability and efficiency of production.

[0087] In summary, this two-dimensional lateral volumetric compression injection device, through its unique structural design and linkage mechanism, effectively solves many problems of traditional axial filling structures and existing lateral compression schemes in terms of equipment cost, component wear, maintenance difficulty, and process control, providing a simple, reliable, and efficient metal hydraulic injection solution.

[0088] For any parts not mentioned in this invention, existing technologies can be used or referenced.

[0089] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0090] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A two-dimensional lateral volumetric compression injection device, comprising a front plate (1) of a pressure chamber, a rear plate (2) of a pressure chamber, a plurality of tie rods (3) and a plurality of injection blocks (4), wherein the front plate (1) and the rear plate (2) of the pressure chamber are locked together by the tie rods (3), and the plurality of injection blocks (4) are clamped between the front plate (1) and the rear plate (2) of the pressure chamber and enclose to form a pressure chamber (5), wherein the pressure chamber (5) is connected to a cavity (7) via a gating system (6); characterized in that, Several of the injection blocks (4) can be driven to simultaneously translate towards the center of the pressure chamber (5) along two mutually perpendicular lateral directions, both perpendicular to the axis of the pressure chamber (5), so that the cross-sectional area of ​​the pressure chamber (5) decreases synchronously in the two lateral directions, thereby pressing the molten metal in the pressure chamber (5) into the cavity (7) through the gating channel (6).

2. The injection device according to claim 1, characterized in that, The number of the injection blocks (4) is at least four, and they enclose a pressure chamber (5) with a quadrilateral cross section.

3. The injection device according to claim 2, characterized in that, The two adjacent injection blocks (4) are attached to each other by an inclined surface, which is configured such that when one of the injection blocks (4) moves in a first lateral direction, the other adjacent injection block (4) moves synchronously in a second lateral direction under the push of the inclined surface.

4. The injection device according to claim 3, characterized in that, The inclined plane is at 45° to the direction of movement of the corresponding injection block (4).

5. The injection device according to claim 1, characterized in that, It also includes a compression spring (9) and a spring seat (10), wherein the compression spring (9) is disposed between the spring seat (10) and the injection block (4), and the spring restoring force keeps the inclined surfaces between adjacent injection blocks (4) in contact.

6. The injection apparatus according to claim 5, characterized in that, The injection block (4) is provided with a spring guide rod (11), which is slidably inserted into the spring seat (10).

7. The injection apparatus according to claim 1, characterized in that, The pull rod (3) is provided with a rollable copper sleeve, and the injection block (4) and the pull rod (3) are slidably engaged through the copper sleeve. The pull rod (3) also serves as a translation guide for the injection block (4).

8. The injection apparatus according to claim 1, characterized in that, It also includes an injection block drive source (8), which acts on at least one of the injection blocks (4) to drive the injection blocks (4) to translate simultaneously along the two mutually perpendicular lateral directions.

9. The injection apparatus according to claim 8, characterized in that, The injection block (4) includes two transverse injection sections (13) arranged opposite each other in the first lateral direction and two vertical injection sections (14) arranged opposite each other in the second lateral direction. A guide rail (12) is provided between the front plate (1) of the pressure chamber and the rear plate (2) of the pressure chamber. The transverse injection section (13) and the vertical injection section (14) are slidably engaged with the guide rail (12). The transverse injection section (13) is directly driven by the injection block drive source (8) and moves the vertical injection section (14) synchronously toward the center of the pressure chamber (5) through the inclined surface.

10. The injection apparatus according to claim 1, characterized in that, The cross-sectional area of ​​the pressure chamber (5) decreases nonlinearly with the increase of the displacement of the injection block (4), which makes the filling speed of the molten metal higher in the early stage of filling and lower in the late stage of filling, thus forming an injection curve that is fast at first and slow at the end.

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