Tightening mechanism and magnesium alloy thixomolding die set

Abstract

The application discloses a tensioning mechanism and a magnesium alloy thixomolding die set, and relates to the technical field of metal injection molding. The tensioning mechanism comprises a connecting rod assembly and an elastic assembly. The connecting rod assembly is installed through a first end in a die plate. A melt conveying mechanism parallel to the connecting rod assembly is slidably arranged on one side of the die plate. A second end of the connecting rod assembly is connected to the outside of the melt conveying mechanism. The elastic assembly is arranged on at least one end of the connecting rod assembly and connected to the corresponding melt conveying mechanism or / and die plate. The magnesium alloy thixomolding die set comprises the above tensioning mechanism. The application has the beneficial effects that: the elastic force of the elastic assembly keeps the injection head within a set range of tensioning force, and the tensioning force is maintained without the continuous thrust of an oil cylinder. Reliable force can be provided when the equipment is closed, and safety is ensured. The tensioning mechanism is arranged on the side of the melt conveying mechanism along the axial direction, which facilitates compact layout of the equipment. The connecting rod assembly penetrates the die plate, which can ensure that the connecting rod assembly is axially parallel to the melt conveying mechanism, and improves the installation precision and efficiency.

Description

Technical Field

[0001] This application relates to the field of metal injection molding technology, and in particular to a tensioning mechanism and a magnesium alloy thixotropic molding module. Background Technology

[0002] Magnesium alloys are ideal lightweight metals, lighter than aluminum alloys, while possessing similar high strength and high rigidity. With the continuous narrowing of the price ratio between magnesium and aluminum and the improvement of magnesium alloy processing and die-casting technology, they have become the main raw material for automotive parts, offering significant advantages in lightweighting automotive components.

[0003] In existing technologies, the preparation of semi-solid magnesium alloy slurry primarily employs a barrel-screw feeding method. The injection head at the end of the barrel and the injection port inside the template are sealed together by a tensioning mechanism. Currently, most tensioning mechanisms are hydraulic and installed at the rear / tail end of the barrel along its axial direction. This structure has two drawbacks: firstly, the hydraulic tensioning process requires continuous thrust from the cylinder to maintain tension balance, resulting in high energy consumption and the risk of oil leakage and pressure loss leading to insufficient tension; secondly, the current installation position of the tensioning mechanism increases the overall axial dimension of the equipment, hindering a compact layout. Therefore, improving existing tensioning mechanisms to overcome these problems is a pressing issue for those skilled in the art. Summary of the Invention

[0004] One of the objectives of this application is to provide a tensioning mechanism.

[0005] Another objective of this application is to provide a magnesium alloy thixotropic molding module.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: a tensioning mechanism, comprising a linkage assembly and an elastic component, wherein the linkage assembly is installed through a first end in a template, and a molten material conveying mechanism parallel to the linkage assembly is slidably disposed on one side of the template, and the second end of the linkage assembly is connected to the outside of the molten material conveying mechanism; the elastic component is disposed at at least one end of the linkage assembly and is connected to the corresponding molten material conveying mechanism and / or the template; the elastic component is adapted to apply a force to the molten material conveying mechanism along the axial direction close to the template, so that the molten material conveying mechanism is tensioned and fitted to the template.

[0007] Preferably, the second end of the linkage assembly is connected to the molten material conveying mechanism via the elastic component, and a frame is fixedly connected to the outside of the molten material conveying mechanism; the elastic component includes an elastic element, a guide rod, and a connecting pipe, the connecting pipe is fixedly connected to the frame, the guide rod is inserted and installed at the axis of the connecting pipe, the elastic element is located inside the connecting pipe and its two ends are respectively abutted against the frame and the first end of the guide rod, the second end of the guide rod is connected to the linkage assembly, and the elastic element is in a compressed energy storage state.

[0008] Preferably, the elastic element includes a plurality of disc springs coaxially stacked and sleeved on the guide rod, wherein the conical surfaces of two adjacent disc springs face opposite or the same direction, and the adjacent disc springs are in contact with each other.

[0009] Preferably, at least one disc spring assembly is sleeved on the outside of the guide rod. The disc spring assembly includes four disc springs arranged in sequence: a first disc spring, a second disc spring, a third disc spring, and a fourth disc spring. The conical surfaces of the first and second disc springs face the same direction to form a first disc spring group, and the conical surfaces of the third and fourth disc springs face the same direction to form a second disc spring group. The conical surfaces of the first disc spring group and the second disc spring group face opposite directions.

[0010] Preferably, the linkage assembly includes multiple rods, and adjacent rods are detachably floatingly connected by a connecting assembly; the connecting assembly includes a pair of detachably installed half-hoops, each half-hoop having a snap-fit ​​groove on its opposite side, and the end of each rod having a snap-fit ​​portion that is adapted to the snap-fit ​​groove.

[0011] The second end of the guide rod is connected to the connecting rod assembly via a threaded connection; the initial tension force can then be preset by adjusting the thread engagement length.

[0012] Preferably, the molten material conveying mechanism has a pair of symmetrically slidingly disposed on both sides of the template, and the first end of the connecting rod assembly passes through the template and is connected to the other molten material conveying mechanism; furthermore, the elastic component is adapted to provide a tensioning force that brings the two molten material conveying mechanisms closer to each other synchronously through the connecting rod assembly.

[0013] Preferably, the connecting rod assembly and the elastic component are both a pair, with the two connecting rod assemblies located symmetrically above and below the molten material conveying mechanism, and the two elastic components located at the second end of the connecting rod assembly.

[0014] Preferably, a telescopic device is installed on the frame, and the output end of the telescopic device corresponds to the guide rod; before the molten material conveying mechanism is disassembled, the telescopic device is adapted to extend through the output end and abut against the guide rod, thereby driving the molten material conveying mechanism to move in a direction away from the template.

[0015] A magnesium alloy thixotropic molding module includes the aforementioned tensioning mechanism.

[0016] Compared with the prior art, the beneficial effects of this application are as follows: This invention utilizes a connecting rod assembly and an elastic component. The elastic force of the elastic component keeps the injection head under tension within a set range, eliminating the need for continuous thrust from the hydraulic cylinder to maintain the tension. Even when the equipment is off, reliable force can be applied, ensuring safety. Furthermore, the tensioning mechanism is axially positioned on the side of the molten material conveying mechanism, facilitating a compact layout. The tensioning mechanism maintains the tension through a mechanical elastic energy storage structure, automatically achieving adaptive tensioning on both sides as the molten material conveying mechanism heats up and deforms. Additionally, the connecting rod assembly's design, which extends through the template, allows the template to limit the movement of the connecting rod assembly during installation, effectively ensuring that the connecting rod assembly remains parallel to the axial direction of the molten material conveying mechanism after installation, improving installation accuracy and efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the magnesium alloy thixotropic molding module of the present invention.

[0018] Figure 2 This is a schematic diagram of the connection method between the connecting rod assembly and the elastic assembly in the single-unit tensioning mechanism of the present invention.

[0019] Figure 3 This is a schematic diagram of a second connection method between the connecting rod assembly and the elastic assembly in the single-unit tensioning mechanism of the present invention.

[0020] Figure 4 This is a schematic diagram of the symmetrical double tensioning mechanism of the present invention.

[0021] Figure 5 This is a schematic diagram of the overall three-dimensional structure of the tensioning mechanism of the present invention.

[0022] Figure 6 This is a schematic diagram of the structure of adjacent rods of the present invention when they are installed by a connecting assembly.

[0023] Figure 7 This is a schematic diagram of the overall structure of the elastic component of the present invention.

[0024] Figure 8 This is an exploded structural diagram of the elastic component of the present invention.

[0025] Figure 9 This is a partial cross-sectional view of the elastic component of the present invention.

[0026] Figure 10 for Figure 9 A magnified structural diagram at point A in the diagram.

[0027] Figure 11 This is a schematic diagram illustrating the principle of the barrel of the present invention being tensioned by the elastic component and the connecting rod assembly.

[0028] Figure 12 This is a schematic diagram illustrating the separation principle of the barrel under the action of the telescopic device of the present invention.

[0029] In the diagram: 1. Template; 2. Molten material conveying mechanism; 201. Injection head; 202. Barrel; 3. Injection module; 301. Injection cylinder; 4. Linkage assembly; 401. Rod body; 4011. Snap-fit ​​part; 5. Elastic component; 501. Elastic element; 5011. Disc spring; 502. Guide rod; 503. Connecting pipe; 6. Connecting assembly; 601. Half hoop; 6011. Snap-fit ​​groove; 7. Frame; 8. Sensing module; 9. Telescopic device. Detailed Implementation

[0030] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0031] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and should not be construed as limiting the specific protection scope of this application.

[0032] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0033] Further description of the shortcomings of the existing technology: such as Figure 1As shown, a template 1 for a magnesium alloy thixotropic molding module is installed on the die-casting machine head plate. An injection module 3 is located within the template 1. A molten material conveying mechanism 2 is slidably mounted on the side of the template 1 via a linear guide rail assembly. The injection head 201 of the molten material conveying mechanism 2 is sealed against the injection cylinder 301 in the injection module 3. The workflow is as follows: the molten material conveying mechanism 2 conveys the prepared semi-solid magnesium alloy slurry through the injection head 201 into the injection cylinder 301, and then the injection module 3 injects the slurry into the molding die through the injection punch. Currently, a hydraulic tensioning mechanism is used to set axial thrust at the tail of the molten material conveying mechanism 2 to achieve a tight seal. However, this results in high energy consumption, a tendency for oil leakage and pressure loss leading to insufficient tensioning force, and an increase in the axial dimension of the equipment.

[0034] Therefore, the inventors of this application have developed a tensioning mechanism, one embodiment of which is, for example... Figures 1 to 12 As shown, the tensioning mechanism includes a connecting rod assembly 4 and an elastic component 5. A frame 7 is fixedly installed on the outside of the molten material conveying mechanism 2. The elastic component 5 includes an elastic element 501, a guide rod 502, and a connecting pipe 503. This tensioning mechanism can be divided into two structural forms based on whether the template 1 is configured on one or both sides: single-group tensioning and symmetrical double tensioning.

[0035] Additionally, it should be noted that the tensioning mechanism is not limited to the tensioning cooperation between the molten material conveying mechanism 2 and the template 1, but can also be applied to other parts assembly scenarios that require pre-tensioning. This embodiment takes the tensioning scenario of the molten material conveying mechanism 2 applied to a magnesium alloy thixotropic molding module as an example for description.

[0036] Example 1: like Figure 2 and Figure 3 As shown, the tensioning mechanism is arranged on one side of the template 1 to provide tensioning force to the molten material conveying mechanism 2 set on one side. The following description takes the arrangement of the molten material conveying mechanism 2 being horizontally slidably installed on the right side of the template 1 as an example. The first end of the connecting rod assembly 4 is the left end, and the second end is the right end. The connecting rod assembly 4 and the elastic component 5 can be connected in various ways, including but not limited to the following three: Method 1: For example Figure 2 As shown, the left end of the connecting rod assembly 4 is installed through the template 1. The left end of the connecting rod assembly 4 can be fixedly installed with the left side of the template 1, or it can be abutted against the left side of the template 1 by a limiting head to ensure that the connecting rod assembly 4 will not come out axially to the right. The connecting pipe 503 is horizontally fixedly installed on the frame 7, and the guide rod 502 is horizontally inserted into the axis of the connecting pipe 503. The two ends of the elastic element 501 are respectively abutted against the right end of the frame 7 and the guide rod 502. The left end of the guide rod 502 is connected to the right end of the connecting rod assembly 4, and the elastic element 501 is in a compressed energy storage state.

[0037] It is understandable that, such as Figure 2 As shown, let the horizontal elastic forces generated at both ends of the elastic component 5 be F1 and F2. F1 acts on the connecting rod assembly 4, thereby generating a rightward force on the connecting rod assembly 4, while F2 acts on the frame 7, thereby generating a leftward force on the frame 7 and the molten material conveying mechanism 2. Under this force, the injection head 201 of the molten material conveying mechanism 2 can remain taut and tightly fitted to the injection cylinder 301 port on one side of the template 1, achieving a stable seal.

[0038] Method 2: For example Figure 3 As shown, the right end of the guide rod 502 is installed on the left end of the connecting rod assembly 4, the elastic element 501 is respectively abutted against the left end of the template 1 and the guide rod 502, the connecting pipe 503 is fixed to the left side of the template 1 and sleeved on the outside of the guide rod 502 and the elastic element 501, and the elastic element 501 is in a compressed energy storage state.

[0039] It is understandable that the horizontal elastic forces generated at both ends of the elastic component 5 are F1 and F2. F1 acts on the template 1, while F2 pulls the connecting rod assembly 4 to the left through the guide rod 502. The right end of the connecting rod assembly 4 pulls the frame 7 and the molten material conveying mechanism 2 to the left, so that the injection head 201 is tightened and fits against the port of the injection cylinder 301, which can also achieve a stable seal.

[0040] Method 3 (not shown): This is a combination of Methods 1 and 2. Elastic components 5 are located at both ends of the connecting rod assembly 4. One end is connected to the template 1 via elastic component 5, and the other end is connected to the frame 7 via elastic component 5. The two elastic components 5 work together to provide a leftward tension force to the molten material conveying mechanism 2. Simply put, it essentially splits one end of the connecting rod assembly 4's elastic component 5 in two. While this provides double protection—meaning that if one end of the elastic component 5 fails, the other end can still maintain tension—adjusting the preload requires simultaneous operation at both ends, making the adjustment more difficult and costly.

[0041] It should be noted that all three methods can meet practical needs, and those skilled in the art can choose according to the actual situation. This application adopts a design where the connecting rod assembly 4 penetrates through the template 1, and arranges the tensioning force-applying structure on the outside of the molten material conveying mechanism 2 on the side of the template 1. This eliminates the need to occupy the axial installation space on the rear side of the molten material conveying mechanism 2, effectively shortening the overall axial dimension of the equipment and facilitating a more compact layout. At the same time, the tensioning force is provided by the elastic component 5 in a compressed and stored state, eliminating the need for continuous output thrust from the hydraulic cylinder to maintain the tensioning force. This reduces the energy consumption of the equipment and avoids the problem of insufficient tensioning force caused by oil leakage and pressure loss in the hydraulic system.

[0042] It is worth mentioning that the structural design of the connecting rod assembly 4 penetrating through the template 1 has the following advantages: high installation accuracy and good installation stability. Specifically: if the left end of the connecting rod assembly 4 is directly connected to the right side of the template 1, it is difficult to ensure the parallelism between the connecting rod assembly 4 and the molten material conveying mechanism 2 during installation. This would result in an angle between the direction of the tensioning force applied by the elastic component 5 and the axial direction of the molten material conveying mechanism 2. This angle would cause the tensioning force to decompose into a component perpendicular to the axial direction, affecting its service life. However, by penetrating the template 1 axially, the template 1 can directly limit the installation position of the connecting rod assembly 4, effectively ensuring that the connecting rod assembly 4 remains parallel to the axial direction of the molten material conveying mechanism 2 after installation, thus improving installation accuracy. In addition, after the connecting rod assembly 4 is installed through the template 1, the left and right through-holes in the template 1 form a couple support, which can counteract the bending moment caused by the off-center load of the connecting rod assembly 4, thereby improving installation stability.

[0043] Example 2: like Figure 4 As shown, the tensioning mechanism is arranged on both sides of the template 1 to provide tensioning force to the molten material conveying mechanisms 2 set on both sides; that is, the molten material conveying mechanisms 2 are arranged in a horizontally symmetrical sliding configuration on the left and right sides of the template 1, with the first end of the connecting rod assembly 4 being the left end and the second end being the right end. Both ends of the connecting rod assembly 4 are connected to the two molten material conveying mechanisms 2, and at least one end of the connecting rod assembly 4 is connected to the molten material conveying mechanism 2 through an elastic component 5.

[0044] It should be noted that the number of elastic components 5 and the connection method can refer to the three forms in Embodiment 1. In this embodiment, a single elastic component 5 is configured at the right end of the linkage assembly 4 as an example.

[0045] It is understandable that, such as Figure 11 As shown, the elastic component 5 is located on the right side of the molten material conveying mechanism 2. Let the horizontal elastic forces generated at both ends of the elastic component 5 be F1 and F2. F1 acts on the connecting rod assembly 4, which pulls the left side of the molten material conveying mechanism 2, causing the left injection head 201 to tighten and adhere to the injection cylinder 301 within the template 1. Simultaneously, F2 acts directly on the right side of the molten material conveying mechanism 2, generating a thrust that causes the right injection head 201 to also tighten and adhere to the injection cylinder 301 within the template 1.

[0046] Specifically, such as Figure 11As shown, let the initial compressed length of the elastic component 5 be L. During metal injection molding, the barrel 202 of the molten material conveying mechanism 2 generates high temperatures. According to the principle of thermal expansion and contraction, the overall length of the barrel 202 will elongate due to heat. The connecting rod assembly 4, located outside the barrel 202, will not elongate due to heat; therefore, the connecting rod assembly 4 can be considered a rigid, fixed-length structure. Thus, the elongated barrel 202 compresses the length of the elastic component 5, reducing L and automatically compensating for the elongation of the barrel 202. This ensures that the injection heads 201 of the two molten material conveying mechanisms 2 always maintain a tension force within a set range, eliminating the need for continuous output thrust from the hydraulic cylinder to maintain tension. This reduces energy consumption and avoids the risk of oil leakage and pressure drop caused by long-term operation of the hydraulic cylinder. Furthermore, this tensioning mechanism uses mechanical elasticity to maintain a stable tension force, resulting in a simple and reliable structure. Even when the equipment is off, it can apply a reliable force, fully ensuring safety.

[0047] It should be added that using a pair of molten material conveying mechanisms 2 for double-sided pulping doubles the pulping power, enabling the production of larger magnesium alloy products. In existing technologies, to improve the melting efficiency of magnesium alloys by the barrel 202 in single-sided pulping, a barrel 202 of greater length and diameter and a screw are generally designed. This significantly increases the manufacturing difficulty and cost of components such as the barrel 202 and screw. Furthermore, an excessively long screw has a large torsion angle and insufficient rigidity when subjected to torque, making it prone to breakage. The motor power driving the screw is also excessive, resulting in lower starting and output efficiency compared to the parallel pulping scheme with double-sided barrels 202. Therefore, the double-sided pulping scheme has a more significant advantage when producing large-sized magnesium alloy parts. This tensioning mechanism solves the tensioning and sealing problem of the double-sided pulping scheme, making it more practical.

[0048] Specifically, such as Figure 8 and Figure 11 As shown, the connection method between the connecting rod assembly 4 and the elastic component 5 is the same as the first connection method in the above embodiment, and will not be repeated here. It can be understood that the elastic component 501 will generate elastic forces in opposite directions on the guide rod 502 and the frame 7. The guide rod 502 is subjected to an elastic force F1 pointing away from the template 1, which in turn pulls the connecting rod assembly 4. The frame 7 is subjected to an elastic force F2 pointing towards the template 1, which in turn drives the barrel 202 to move closer to the template 1. Finally, the double-sided injection heads 201 can simultaneously obtain a tensioning force towards the template 1.

[0049] As a further description of Embodiments 1 and 2 above: This application does not limit the specific structure of the elastic element 501, but provides a specific embodiment for reference below: like Figures 8 to 10As shown, the elastic element 501 consists of multiple disc springs 5011, which are coaxially stacked and sleeved on the outside of the guide rod 502, and adjacent disc springs 5011 are kept in close contact with each other. Of course, the elastic element 501 can also be a regular spring (i.e., a cylindrical helical spring), but it has the following disadvantages: (1) Low space efficiency: its stroke is large, which in turn occupies a large axial space; (2) Easy to relax: it is easy to relax under long-term heavy load, resulting in a decrease in preload; (3) Inconvenient maintenance: it needs to be replaced as a whole when damaged. Therefore, disc springs 5011 are preferred, which have the advantages of small space, large load and high stiffness.

[0050] It should be noted that the disc spring 5011 can be used individually or in combination in pairs, and there are various ways to combine them, including but not limited to the following three: The first combination is stacking (parallel connection), where all disc springs 5011 are stacked in the same direction, meaning the conical surfaces of the disc springs 5011 face the same direction. The total load is the sum of the load-bearing capacities of individual disc springs 5011, and the deformation is the same as that of a single disc spring 5011. The stiffness increases with the number of disc springs 5011.

[0051] The second combination is a series arrangement, where disc springs 5011 are stacked alternately, one facing forward and the other backward, meaning the conical surfaces of the disc springs 5011 face opposite directions. The total deformation is the sum of the deformations of individual disc springs 5011, and the load-bearing capacity is the same as that of a single disc spring 5011.

[0052] The third combination: composite (hybrid), first stacking multiple 5011 disc springs into a group, then combining multiple groups together. Flexible combination, which can take into account both load-bearing capacity and compression.

[0053] Based on the above three combinations of disc springs 5011, in one embodiment of this application, a composite combination is adopted, which achieves a large compression amount while ensuring sufficient load-bearing capacity, enough to compensate for the dimensional changes caused by the thermal expansion of the barrel 202. Specifically, as shown... Figure 10As shown, at least one disc spring assembly is sleeved on the outside of the guide rod 502. This disc spring assembly includes four disc springs arranged sequentially from left to right: a first disc spring, a second disc spring, a third disc spring, and a fourth disc spring. The first and second disc springs have the same cone surface orientation to form a first disc spring group, satisfying the requirements for stacking and combining. This allows the load-bearing capacity of the first disc spring group to be doubled compared to a single disc spring 5011, while maintaining the deformation of a single disc spring 5011, resulting in higher stiffness. Similarly, the third and fourth disc springs have the same cone surface orientation to form a second disc spring group, also increasing the load-bearing capacity and stiffness. The first and second disc spring groups have opposite cone surface orientations, satisfying the requirements for mating and combining. The total deformation is the sum of the deformations of the two disc spring groups, ensuring both overall load-bearing capacity and a larger compression stroke. Those skilled in the art can select the appropriate number of disc spring assemblies based on actual conditions to meet the different degrees of thermal elongation compensation requirements of the adaptable barrel 202.

[0054] like Figures 2 to 4 As shown, the connecting rod assembly 4 is installed through the template 1, and the overall length of the connecting rod assembly 4 is relatively long. If the connecting rod assembly 4 is processed into a straight rod, it will not only be difficult to process, but also inconvenient to transport and install. In addition, if local deformation or damage occurs, the whole assembly must be replaced, resulting in high maintenance costs.

[0055] Therefore, in order to solve the above-mentioned technical problems, in one embodiment of this application, such as Figure 5 As shown, the connecting rod assembly 4 includes multiple rods 401, and adjacent rods 401 are detachably floatingly connected by connecting components 6. This structure allows for segmented batch processing of the rods 401, reducing processing difficulty and facilitating transportation and installation. If a section of rod 401 is deformed or damaged, only the corresponding section needs to be replaced, effectively reducing maintenance costs. Simultaneously, the floating connection compensates for coaxiality errors during the mating of adjacent rods 401. Furthermore, in actual use, it provides a certain amount of redundancy for the installation, adjustment, and deformation of the connecting rod assembly 4, preventing assembly stress or jamming throughout the connecting rod.

[0056] Specifically, such as Figure 6 As shown, the connecting assembly 6 includes a pair of detachable and installable semi-hoops 601. The two semi-hoops 601 can be locked together with bolts at the connection position of two adjacent rods 401. Each semi-hoop 601 has a snap-fit ​​groove 6011 on its opposite side, and the end of the rod 401 is provided with a radially protruding snap-fit ​​part 4011. After the two semi-hoops 601 are locked together, the snap-fit ​​parts 4011 at the ends of the two adjacent rods 401 are respectively snapped into the snap-fit ​​grooves 6011 on both sides, achieving reliable positioning. At the same time, the inner diameter of the snap-fit ​​groove 6011 is slightly larger than the outer diameter of the snap-fit ​​part 4011, so that a small movement gap can be maintained between adjacent rods 401, achieving the installation requirements of floating fit. The structure is simple, easy to disassemble and assemble, and easy to maintain.

[0057] Further preferably, the snap-fit ​​part 4011 adopts a circular structure, that is, the snap-fit ​​part 4011 is an annular flange integrally machined from the end of the rod 401. This structure is easy to process, and the rod 401 can also be rotated and adjusted in the circumferential direction, further improving the flexibility during actual installation.

[0058] In this embodiment, as Figure 7 As shown, to facilitate the pre-setting of the initial preload of the elastic component 5 and thus adapt to the tension requirements under different working scenarios, the guide rod 502 and the connecting rod assembly 4 are connected by a threaded connection. Specifically, a sensing module 8 is installed at the second end of the guide rod 502. The sensing module 8 and the rod body 401 of the connecting rod assembly 4 are connected by a thread. By rotating the rod body 401, the thread engagement length between the sensing module 8 and the rod body 401 can be adjusted, thereby changing the initial compression of the elastic component 501. With the sensing module 8 monitoring the initial preload, the magnitude of the initial tension can be accurately preset. For example, a plane that mates with a wrench can be set on the outside of the corresponding rod body 401. The adjustment operation can be completed by rotating the rod body 401 with a wrench, which is very convenient.

[0059] Further optimization, such as Figures 2 to 4 As shown, both the connecting rod assembly 4 and the elastic assembly 5 can be used as a pair, with the two connecting rod assemblies 4 symmetrically arranged on the upper and lower sides of the molten material conveying mechanism 2. For the double-sided pulping mode, as... Figure 4 As shown, the elastic components 5 are arranged on the upper and lower sides of the same molten material conveying mechanism 2. The symmetrical layout allows the tension force on the molten material conveying mechanism 2 to be distributed more evenly, avoiding the skewing of the injection head 201 due to uneven force, ensuring the flatness of the sealing fit, and further improving the sealing performance.

[0060] Further optimization, such as Figure 4 As shown, for the dual-side pulping mode, the axes of the two molten material conveying mechanisms 2 coincide and are perpendicular to the axis of the injection module 3. The two molten material conveying mechanisms 2 are symmetrically distributed on both sides of the template 1. The two injection heads 201 are simultaneously aligned with the center of the injection cylinder 301 of the injection module 3. This makes the injection cylinder 301 more uniformly stressed and the overall operation of the equipment more stable.

[0061] Based on the above-mentioned double-sided slurry preparation scheme using a pair of molten material conveying mechanisms 2, this scheme also has the following drawbacks: after the molten metal injection molding is completed, the barrel 202 needs to be disassembled for maintenance and cleaning, that is, the molten material conveying mechanism 2 and the template 1 need to be disassembled. At this time, the molten metal between the injection head 201 and the injection barrel 301 will cool and solidify (i.e., magnesium rod). Direct disassembly requires the application of a large external force, which increases the difficulty of disassembly and maintenance.

[0062] Therefore, in order to solve the above-mentioned technical problems, such as Figure 7 and Figure 8 As shown, a telescopic device 9 is installed on the frame 7 or the connecting pipe 503, and the output end of the telescopic device 9 corresponds to the guide rod 502.

[0063] Specifically, the telescopic device 9 can be a thin jack, such as... Figure 12 As shown, the jack is equivalent to being directly fixed to the frame 7 outside the barrel 202, and a thrust F is applied to the guide rod 502 through the jack. 推 Then, through the rigid connecting rod assembly 4, the left barrel 202 is acted upon, causing the left injection head 201 to separate from the injection barrel 301, breaking the magnesium rod; similarly, F 推 The reaction force will act on the jack itself and the right barrel 202, thereby causing the right barrel 202 to move in the opposite direction, so that the right injection head 201 and the injection cylinder 301 will also separate synchronously, making it easier to complete the subsequent disassembly and maintenance work without the need for additional external pulling equipment.

[0064] Further optimization involves performing the magnesium rod breaking operation when the temperature inside the barrel 202 drops to approximately 300°C. The principle behind this is that the mechanical properties of magnesium alloys decrease as the temperature increases, and the decrease in mechanical properties is more pronounced at 300°C, resulting in a smaller force required for the breaking operation. Furthermore, the magnesium alloy is not prone to reacting with other substances due to excessively high temperatures. This temperature is within a safe range, balancing operational safety with the convenience of breaking the rod.

[0065] Another aspect of this application provides a magnesium alloy thixotropic molding module, including the aforementioned tensioning mechanism.

[0066] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A tensioning mechanism, characterized in that, include: A linkage assembly, wherein the linkage assembly is mounted through a template at its first end, a molten material conveying mechanism parallel to the linkage assembly is slidably disposed on one side of the template, and the second end of the linkage assembly is connected to the outside of the molten material conveying mechanism; and An elastic component is disposed at at least one end of the linkage assembly and connected to the corresponding molten material conveying mechanism and / or the template; The elastic component is adapted to apply a force along the axial direction of the molten material conveying mechanism close to the template, so that the molten material conveying mechanism is tightly fitted to the template.

2. The tensioning mechanism as described in claim 1, characterized in that: The second end of the linkage assembly is connected to the molten material conveying mechanism via the elastic component. A frame is fixedly attached to the outside of the molten material conveying mechanism. The elastic component includes an elastic element, a guide rod, and a connecting pipe. The connecting pipe is fixedly attached to the frame. The guide rod is inserted and installed at the axis of the connecting pipe. The elastic element is located inside the connecting pipe and its two ends are respectively abutted against the frame and the first end of the guide rod. The second end of the guide rod is connected to the linkage assembly, and the elastic element is in a compressed energy storage state.

3. The tensioning mechanism as described in claim 2, characterized in that: The elastic element includes multiple disc springs coaxially stacked and sleeved on the guide rod, with the conical surfaces of two adjacent disc springs facing opposite or the same direction, and the adjacent disc springs fitting together.

4. The tensioning mechanism as described in claim 3, characterized in that: At least one disc spring assembly is sleeved on the outside of the guide rod. The disc spring assembly includes four disc springs arranged in sequence: a first disc spring, a second disc spring, a third disc spring, and a fourth disc spring. The conical surfaces of the first disc spring and the second disc spring face the same direction to form a first disc spring group. The conical surfaces of the third disc spring and the fourth disc spring face the same direction to form a second disc spring group. The conical surfaces of the first disc spring group and the second disc spring group face opposite directions.

5. The tensioning mechanism as described in claim 4, characterized in that: The linkage assembly includes multiple rods, and adjacent rods are detachably and floatingly connected by a connecting assembly. The connecting assembly includes a pair of detachable and installable semi-hoops, each of which has a snap-fit ​​groove on its opposite side. The end of the rod has a snap-fit ​​portion that is adapted to the snap-fit ​​groove.

6. The tensioning mechanism as described in claim 5, characterized in that: The second end of the guide rod is connected to the connecting rod assembly via a threaded connection; the initial tension force can then be preset by adjusting the thread engagement length.

7. The tensioning mechanism as described in claim 2, characterized in that: The molten material conveying mechanism has a pair of symmetrically slidingly arranged on both sides of the template. The first end of the connecting rod assembly passes through the template and is connected to the other molten material conveying mechanism. Furthermore, the elastic component is adapted to provide a tensioning force that brings the two molten material conveying mechanisms closer to each other synchronously through the connecting rod assembly.

8. The tensioning mechanism as described in claim 7, characterized in that: The connecting rod assembly and the elastic component are both a pair, with the two connecting rod assemblies located symmetrically above and below the molten material conveying mechanism, and the two elastic components located at the second end of the connecting rod assembly.

9. The tensioning mechanism as described in claim 8, characterized in that: The frame is equipped with a telescopic device, the output end of which corresponds to the guide rod. Before disassembling the molten material conveying mechanism, the telescopic device is adapted to extend through its output end and abut against the guide rod, thereby driving the molten material conveying mechanism to move in a direction away from the template.

10. A magnesium alloy thixotropic forming module, characterized in that, Including the tensioning mechanism as described in any one of claims 1-9.

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