A liquid metal quantitative delivery device for aluminum alloy die casting

Abstract

The application discloses a molten metal quantitative conveying device for aluminum alloy die casting and relates to the technical field of aluminum alloy die casting equipment. The device comprises a driving assembly, a centering assembly is fixed below the driving assembly, a quantitative assembly is coaxially arranged inside the centering assembly, and a conveying assembly is connected to the liquid outlet end of the quantitative assembly. The centering assembly comprises a mounting seat, a boss is arranged on the inner hole wall of the mounting seat, a second gasket is arranged on the upper end surface of the boss, a cylinder body is coaxially arranged inside the mounting seat, an end cover is fixed to the top end of the cylinder body, a boss is outwardly extended from the upper portion of the cylinder body, the boss is supported above the second gasket, and a first gasket is arranged on the upper end surface of the boss. Through the cooperative matching of the centering assembly, the quantitative assembly, the one-way valve and the conveying assembly, the problems of the limited service life of the sealing element between the plunger and the cylinder body, the deviation of the centering state of the cylinder body and the driving component caused by the inconsistent thermal expansion amount, and the decline of the return action reliability of the spool of the liquid inlet one-way valve with the extension of the operation time are solved.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy die casting equipment technology, specifically to a quantitative conveying device for molten metal in aluminum alloy die casting. Background Technology

[0002] The molten metal quantitative conveying device used for aluminum alloy die casting is a core process equipment for the transfer and quantitative pouring of molten aluminum. It is a key unit that determines the dimensional accuracy, internal density, finished product qualification rate, and overall production line efficiency of die castings.

[0003] Existing quantitative conveying devices for molten metal in aluminum alloy die casting mostly employ pneumatic quantitative furnaces, rotary ladle feeders, and plunger quantitative pumps. Pneumatic quantitative furnaces control the output of molten aluminum by relying on the pressure difference within the furnace; rotary ladle feeders use a robotic arm to scoop a fixed amount of molten aluminum for delivery; and plunger quantitative pumps use the reciprocating motion of a plunger to change the volume of the cavity for quantitative dispensing. However, under conditions of frequent alloy grade changes, numerous casting specification adjustments, fluctuations in the molten metal level, and uneven furnace temperature, these technologies have the following limitations: the quantitative accuracy of pneumatic quantitative furnaces is affected by fluctuations in the molten metal level and furnace temperature, resulting in insufficient long-term stability; and pressurization within the furnace can easily exacerbate molten metal oxidation and gas entrapment. Rotary ladle feeders... The molten aluminum is transported in an open manner, resulting in a large area of ​​contact between the molten aluminum and the air. This leads to a high amount of oxide inclusions and causes cumulative deviations in scooping accuracy as the liquid level drops, resulting in a significant decrease in accuracy over long-term operation. The plunger-type quantitative pump requires a sealing structure between the plunger and the cylinder to prevent leakage of molten aluminum. Under high-temperature conditions, the service life of the seals is limited, and replacing the seals after failure involves shutdown for cooling and disassembly of the furnace. Due to the different thermal expansion of the cylinder and the drive components, the alignment is prone to shift during long-term operation. In the case of frequent opening and closing of the inlet check valve and immersion in molten aluminum, the reliability of the valve core return action decreases with the extension of operating time. The embedded installation method of the core components limits the space for maintenance and operation, resulting in long maintenance time. Summary of the Invention

[0004] The purpose of this invention is to provide a quantitative conveying device for molten metal in aluminum alloy die casting, in order to solve the problems mentioned in the background art, such as the limited service life of the seal between the plunger and the cylinder, the misalignment of the cylinder and the drive component due to inconsistent thermal expansion, and the decrease in the reliability of the return action of the inlet check valve core as the operating time increases.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The present invention provides a quantitative conveying device for molten metal in aluminum alloy die casting, including a driving assembly, a centering assembly fixed below the driving assembly, a quantitative assembly coaxially mounted inside the centering assembly, and a conveying assembly connected to the liquid outlet end of the quantitative assembly. The centering assembly includes a mounting base, the inner wall of which is provided with a boss, and a second washer is placed on the upper end face of the boss. A cylinder is coaxially provided inside the mounting base, and an end cap is fixed to the top of the cylinder. A boss extends outward from the upper part of the cylinder and supports the second washer. A first washer is provided on the upper end face of the boss. A second flange is fixed to the top of the mounting base. The boss, the first washer, and the second washer cooperate to form a spherical hinge pair. A radial gap is left between the inner wall of the mounting base and the outer edge of the boss, and a radial gap is left between the outer wall of the cylinder and the center hole of the second flange. The metering component includes a plunger coaxially disposed inside the cylinder body. The upper section of the plunger is provided with a plunger sealing section, and the plunger sealing section is precisely clearance-fitted with the inner wall of the cylinder body. A transmission rod extends upward from the center of the upper end of the plunger. Multiple axial through holes are evenly distributed along the circumference on the plunger body next to the root of the transmission rod to connect the lower cavity of the plunger with the upper cavity.

[0006] Preferably, the drive assembly includes a first flange, a gantry frame is fixed to the upper end of the first flange, a linear drive module is installed on the top of the gantry frame, and a connecting rod and a coupling are sequentially connected to the output end of the linear drive module. The connecting rod is fixedly connected to the transmission rod at the upper end of the plunger through the coupling.

[0007] Preferably, the lower surface of the boss is an outwardly convex spherical surface, and the upper surface is an inwardly concave spherical surface. The lower surface of the first washer is a convex spherical surface that matches the upper surface of the boss, and the upper surface of the second washer is a concave spherical surface that matches the lower surface of the boss. All spherical surfaces share the same center of curvature and are located on the axis of the cylinder.

[0008] Preferably, the working section of the plunger has a three-stage stepped structure, consisting of a plunger sealing section, a plunger pressure stabilizing section, and a plunger guide section from top to bottom. The diameter of each section increases sequentially, and the sections are smoothly transitioned by a conical surface. A transmission rod extends above the plunger sealing section.

[0009] Preferably, the outer circular surface of the plunger sealing section is provided with a plurality of microgrooves, the plurality of microgrooves are closed independent structures, and the plurality of microgrooves are arranged at equal intervals along the axial direction of the plunger sealing section, and the cross section of each microgroove is semi-circular.

[0010] Preferably, a groove is provided on the lower part of the inner wall of the cylinder, and a guide ring is embedded in the groove. The inner hole of the guide ring is in clearance fit with the guide section of the plunger to form a radial constraint on the lower end of the plunger.

[0011] Preferably, the lower part of the cylinder is symmetrically provided with liquid inlets, and each liquid inlet is provided with a one-way valve on one side. Each one-way valve includes a liquid inlet pipe connected to the liquid inlet. The lower end of the liquid inlet pipe is connected to a valve seat. The inner hole of the valve seat is machined with a conical sealing surface. The inner side of the valve seat is provided with a freely movable valve core. The valve core sits on the conical sealing surface by gravity.

[0012] Preferably, the valve seat has two symmetrically arranged blocks on its inner side. The two blocks are fixed on the upper sides of the valve core. Each block has an arc-shaped surface that matches the spherical surface of the valve core on its side facing the valve core, so as to limit the maximum opening stroke of the valve core.

[0013] Preferably, the conveying assembly includes a flow channel body, the outer wall of the flow channel body is wrapped with a heat insulation layer, a protective sleeve is fitted on the outside of the heat insulation layer, the inlet end of the flow channel body is connected to a liquid outlet pipe, the liquid outlet pipe is connected to the liquid outlet on the side of the cylinder, and both ends of the flow channel body are fitted to the docking end face through a conical hard seal.

[0014] Preferably, clamps are provided at both ends of the flow channel body to compress and seal, and brackets are symmetrically provided at the lower middle section of the flow channel body, with each bracket supporting the bottom of the protective sleeve through a flexible pad at its upper end.

[0015] Compared with the prior art, the beneficial effects of the present invention are: In this invention, the coordinated operation of the centering component, the metering component, the one-way valve, and the delivery component improves the problems of limited service life of the seals between the plunger and the cylinder, misalignment of the cylinder and the drive components due to inconsistent thermal expansion, and decreased reliability of the return action of the inlet one-way valve core with prolonged operation. In the centering component, the engagement of the boss with the second and first washers forms a spherical hinge pair, allowing the cylinder to adaptively deflect around the center of the sphere, automatically compensating for high-temperature thermal deformation and assembly errors, and providing a stable coaxiality basis for the precise clearance fit between the plunger sealing section and the inner wall of the cylinder. In the metering component, the precise clearance fit between the plunger sealing section and the inner wall of the cylinder utilizes the surface tension of the molten aluminum to form a liquid... In the membrane seal, multiple through holes evenly distributed along the circumference on the side of the root of the transmission rod connect the lower cavity of the plunger with the upper cavity, making the pressure difference between the two ends of the sealing section approach zero. The annular microgroove locks the liquid film through capillary effect, maintaining the sealing stability during reciprocating motion. In the check valve, the valve core relies on gravity to sit on the conical sealing surface to achieve reverse shut-off. The arc surface of the stop restricts the opening stroke of the valve core and assists in centering, avoiding the opening and closing response lag caused by the high temperature creep of the spring. In the conveying assembly, the heat insulation layer and sheath on the outer wall of the main body of the flow channel reduce the temperature drop during the conveying process. The two ends of the main body of the flow channel are fitted to the docking end face through conical hard seals. The clamps are pressed to form a closed conveying channel without rubber seals, reducing the amount of aluminum oxide inclusions brought in. Attached Figure Description

[0016] Figure 1 This is a perspective view of the main structure in this invention; Figure 2 This is a side view of the three-dimensional structure in this invention; Figure 3 This is a schematic diagram of the installation location structure of the driving component in this invention; Figure 4 This is a schematic diagram of the installation position structure of the centering component in this invention; Figure 5 This is a schematic diagram of the structure of the first washer, the boss, and the second washer in this invention; Figure 6 This is a schematic diagram of the card slot and liquid inlet in this invention; Figure 7 This is a schematic diagram of the quantitative component in this invention; Figure 8 This is a schematic diagram of the installation position structure of the one-way valve in this invention; Figure 9 This is a schematic diagram of the installation position structure of the conveying component in this invention; Figure 10 This is a schematic diagram showing the installation positions of the main flow channel, insulation layer, and protective sleeve in this invention.

[0017] In the diagram: 100, Drive assembly; 101, First flange; 102, Gantry frame; 103, Linear drive module; 104, Connecting rod; 105, Coupling; 200, Centering assembly; 201, Mounting base; 202, Second flange; 203, First gasket; 204, Boss; 205, Second gasket; 206, Cylinder body; 207, Boss; 208, End cap; 209, Slot; 210, Liquid inlet; 211, Liquid outlet; 300, Metering assembly; 301, Transmission... 302. Plunger sealing section; 303. Microgroove; 304. Plunger pressure stabilizing section; 305. Plunger guide section; 306. Guide ring; 307. Check valve; 3071. Inlet pipe; 3072. Valve seat; 3073. Conical sealing surface; 3074. Valve core; 3075. Stop block; 308. Through hole; 400. Conveying assembly; 401. Outlet pipe; 402. Flow channel body; 403. Insulation layer; 404. Sheath; 405. Bracket; 406. Clamp. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] like Figures 1-2 As shown, this embodiment provides a quantitative conveying device for molten metal in aluminum alloy die casting, including a drive assembly 100, a centering assembly 200 fixed below the drive assembly 100, a quantitative assembly 300 coaxially installed inside the centering assembly 200, and a conveying assembly 400 connected to the liquid outlet end on the side of the quantitative assembly 300; the whole is arranged coaxially along a single vertical axis, with the upper drive assembly 100 located in the ambient temperature region above the furnace cover of the holding furnace, the lower part of the cylinder 206 immersed in the molten aluminum in the furnace, and the side conveying assembly 400 connected to the injection port of the die casting machine injection chamber. It can realize quantitative conveying of molten aluminum without relying on contact dynamic seals, and is suitable for long-term continuous production of high-temperature molten aluminum.

[0020] like Figure 3 As shown, the drive assembly 100 includes a first flange 101, which is an annular plate structure with bolt holes evenly distributed around its circumference. A gantry frame 102 is fixed to the upper end of the first flange 101. The gantry frame 102 adopts a portal welded frame body with vertical plates on both sides and a horizontal mounting plate on the top. A space is reserved in the center for the connecting rod 104 to pass through. A linear drive module 103 is installed on the top of the gantry frame 102. The linear drive module 103 is vertically arranged with its output end facing downward. The output end of the linear drive module 103 is connected in sequence to a connecting rod 104 and a coupling 105. The connecting rod 104 is fixedly connected to the transmission rod 301 at the upper end of the plunger through the coupling 105.

[0021] In this embodiment, the linear drive module 103 adopts a structure of servo motor, ball screw and linear guide rail, which can output high-precision linear reciprocating motion. The quantitative volume is adjusted by controlling the plunger stroke. The coupling 105 adopts a cross slider structure, which can compensate for radial and angular deviations and avoid the plunger from being worn by lateral loads.

[0022] like Figures 4-6As shown, the centering assembly 200 includes a mounting base 201, which is a thick-walled annular seat with a straight hole structure that runs vertically through the interior. A boss 204 is provided on the inner wall of the mounting base 201. The boss 204 is an annular platform integrally protruding along the circumference of the inner wall. A second washer 205 is placed on the upper end face of the boss 204. A cylinder 206 is coaxially mounted inside the mounting base 201. An end cap 208 is fixed to the top of the cylinder 206 with high-temperature ceramic adhesive through a stop fit. The end cap 208 is a circular silicon nitride ceramic plate with a through hole in the center through which the transmission rod 301 passes. The lower surface of the end cap 208 is sealed to the upper end face of the cylinder 206. The lower surface of the end cap 208, the inner wall of the cylinder 206, and the upper end face of the plunger together form a balance cavity. Multiple through holes 308 on the plunger connect the main metering cavity below the plunger to the balance cavity, allowing the plunger sealing section 302 to... The pressure at both ends remains consistent. A boss 207 extends outward from the upper part of the cylinder body 206. The boss 207 is an integral ring structure that supports the second washer 205. A first washer 203 is provided on the upper end face of the boss 207. A second flange 202 is fixed to the top of the mounting base 201. The second flange 202 is pressed on the first washer 203 and is fastened to the mounting base 201 by circumferential bolts. The boss 207, the first washer 203, and the second washer 205 cooperate to form a spherical hinge pair. The cylinder body 206 can adaptively deflect around the center of the sphere, automatically compensate for high-temperature thermal deformation and assembly errors, and maintain the coaxiality of the plunger and the cylinder body 206. A radial gap of 2 to 3 mm is left between the inner wall of the mounting base 201 and the outer edge of the boss 207. A corresponding gap is left between the center hole of the second flange 202 and the outer wall of the cylinder body 206 to provide radial floating space for the cylinder body 206.

[0023] like Figure 5 As shown, the lower surface of the boss 207 is an outwardly convex spherical surface, and the upper surface is an inwardly concave spherical surface. The lower surface of the first washer 203 is a convex spherical surface that matches the upper surface of the boss 207, and the upper surface of the second washer 205 is a concave spherical surface that matches the lower surface of the boss 207. All spherical surfaces share the same center of curvature, and this center of curvature is located on the axis of the cylinder 206.

[0024] In this embodiment, the first washer 203 and the second washer 205 are made of alumina ceramic material, and the spherical surface is mirror polished. During the mating process, they can achieve multi-directional adaptive deflection while maintaining the contact surface fit, providing stable floating support for the cylinder 206.

[0025] like Figure 7As shown, the metering component 300 includes a plunger coaxially disposed inside the cylinder 206. The upper section of the plunger is provided with a plunger sealing section 302, which is precisely clearance-fitted with the inner wall of the cylinder 206. A transmission rod 301 extends upward from the center of the upper end of the plunger. On the plunger body next to the root of the transmission rod 301, a plurality of axial through holes 308 are evenly distributed along the circumference. The through holes 308 penetrate the plunger body vertically to connect the lower cavity and the upper cavity of the plunger. The through holes 308 can make the pressure in the upper and lower cavities of the plunger more consistent, weaken the pressure difference driving force on both sides of the plunger sealing section 302, and achieve non-contact self-sealing in combination with the precision clearance and the surface tension of the molten aluminum.

[0026] The working section of the plunger has a three-stage stepped structure, consisting of a plunger sealing section 302, a plunger pressure stabilizing section 304, and a plunger guide section 305 from top to bottom. The diameter of each section increases sequentially, and the sections are smoothly transitioned by conical surfaces. A transmission rod 301 extends above the plunger sealing section 302. The progressively increasing stepped structure can form a multi-stage interception and buffer, further reducing the tendency of molten aluminum to leak upwards. The conical transition can reduce the turbulence of molten aluminum flow and avoid local slag formation and material accumulation.

[0027] Multiple microgrooves 303 are formed on the outer circular surface of the plunger sealing section 302. The multiple microgrooves 303 are closed and independent annular structures, and are equidistantly arranged along the axial direction of the plunger sealing section 302. The cross-section of each microgroove 303 is semi-circular. The microgrooves 303 can adsorb aluminum liquid through capillary effect to form multiple closed liquid rings, enhance the stability of the sealing liquid film, maintain the continuity of the liquid film during the reciprocating motion of the plunger, and at the same time play a self-lubricating role, reducing the wear rate of the mating surface.

[0028] like Figure 6 As shown, a groove 209 is provided on the lower part of the inner wall of the cylinder 206. The groove 209 is an annular groove, and a guide ring 306 is embedded in the groove 209. The inner hole of the guide ring 306 is clearance-fitted with the plunger guide section 305 to form a radial constraint on the lower end of the plunger. The guide ring 306 cooperates with the floating centering structure at the upper end to form a statically determinate constraint with radial positioning at the lower end and floating alignment at the upper end, ensuring that the circumferential clearance is uniform during the operation of the plunger and avoiding uneven wear on one side.

[0029] like Figure 6 as well as Figure 8As shown, the lower part of the cylinder body 206 is symmetrically provided with liquid inlets 210. Each liquid inlet 210 is provided with a one-way valve 307 on one side. Each one-way valve 307 includes a liquid inlet pipe 3071 connected to the liquid inlet 210. The lower end of the liquid inlet pipe 3071 is connected to a valve seat 3072. The inner hole of the valve seat 3072 is machined with a conical sealing surface 3073. The inner side of the valve seat 3072 is provided with a freely movable valve core 3074. The valve core 3074 has a spherical structure and sits on the conical sealing surface 3073 by its own weight. When a negative pressure is formed in the cylinder, the valve core 3074 is pushed upward by the aluminum liquid to realize liquid inlet. When the pressure in the cylinder increases, the valve core 3074 is pressed on the conical sealing surface 3073 to realize reverse cut-off. There is no need to set a spring reset structure, which avoids the problems of spring creep relaxation and delayed opening and closing response under high temperature environment.

[0030] like Figure 7 As shown, two symmetrical stop blocks 3075 are provided on the inner side of the valve seat 3072. The stop block 3075 is a small silicon nitride ceramic block, which is fixed to the inner wall of the liquid inlet pipe 3071. The side of the stop block 3075 facing the valve core 3074 is machined with an arc-shaped surface that matches the spherical surface of the valve core 3074 to limit the maximum opening stroke of the valve core 3074. The stop block 3075 can prevent the valve core 3074 from being pushed away too far by the liquid flow, ensuring that it can accurately sit on the sealing surface when returning to its original position. The arc-shaped surface can guide the valve core 3074 to center, reducing the risk of jamming. Moreover, the overall volume of the stop block 3075 is small, and its impact on the flow area is weak, so it will not significantly increase the flow resistance.

[0031] like Figures 9-10 As shown, the conveying assembly 400 includes a flow channel body 402, the outer wall of which is wrapped with an insulation layer 403, and a protective sleeve 404 is fitted on the outside of the insulation layer 403. The inlet end of the flow channel body 402 is connected to an outlet pipe 401, which is connected to the outlet port 211 on the side of the cylinder body 206. Both ends of the flow channel body 402 are fitted to the docking end face through a conical hard seal.

[0032] In this embodiment, the main body 402 of the flow channel is made of silicon carbide ceramic material, and the insulation layer 403 is made of nano aerogel felt, which can reduce the temperature drop during the aluminum liquid transportation process, maintain the fluidity of the melt, and the conical hard seal does not require rubber seals, which is suitable for high temperature conditions and can avoid leakage problems caused by the aging and failure of seals.

[0033] like Figures 9-10As shown, clamps 406 are provided at both ends of the flow channel body 402 for compression and sealing. The clamps 406 adopt a two-half ring structure and provide axial clamping force by locking the end bolts. The flow channel body 402 is symmetrically provided with brackets 405 at the lower middle section. The upper end of each bracket 405 supports the bottom of the protective sleeve 404 through a flexible pad. The brackets 405 can support most of the self-weight of the flow channel, reduce the bending moment load at the joint, and the flexible pad can adapt to the slight floating of the cylinder 206, avoiding rigid constraints from interfering with the automatic centering action of the cylinder 206.

[0034] Under normal operating conditions, the linear drive module 103 drives the plunger upward, increasing the volume of the main cavity at the bottom of the cylinder 206 and creating a negative pressure inside. The pressure of the molten aluminum outside the cylinder is higher than that inside the cylinder. It pushes the ball valve core 3074 upward through the inlet 210 and the inlet pipe 3071, allowing it to flow smoothly into the main cavity and complete the liquid suction process. When the valve core 3074 rises to its maximum stroke, it is limited by the stop block 3075 and will not deviate too far from the sealing axis. After the plunger rises to the set stroke, it stops, and the pressure inside and outside the cylinder gradually tends to balance. Under its own gravity, the valve core 3074 falls back onto the conical sealing surface 3073, completing the closure of the one-way valve 307.

[0035] During the liquid discharge stage, the linear drive module 103 drives the plunger downward, reducing the volume of the main cavity and increasing the internal pressure. The hydraulic pressure further presses the valve core 3074 onto the conical sealing surface 3073, achieving reliable reverse shut-off. The metered aluminum liquid enters the main body of the flow channel 402 through the liquid outlet 211 and the liquid outlet pipe 401, and is smoothly transported to the injection chamber of the die-casting machine through the closed flow channel, completing one metered pouring.

[0036] During operation, when the cylinder body 206 is heated and undergoes thermal deformation or assembly deviation, the spherical hinge joint between the boss 207 and the first washer 203 and the second washer 205 can adaptively generate a slight deflection, automatically adjusting the posture of the cylinder body 206 to ensure that the circumferential gap between the plunger sealing section 302 and the inner wall of the cylinder body 206 is uniform. The upper and lower chambers of the plunger are connected by circumferentially distributed through holes 308, making the pressure difference on both sides of the plunger sealing section 302 approach zero. Combined with the surface tension of the aluminum liquid and the capillary liquid-locking effect of the microgroove 303, a non-contact self-sealing is achieved, eliminating the need for traditional contact dynamic seals and extending the maintenance cycle under high-temperature conditions.

[0037] During assembly and processing, ceramic parts such as cylinder body 206, plunger, valve seat 3072, and valve core 3074 are sintered and then precision ground to produce mating spherical surfaces and conical sealing surfaces 3073 that mate with the plunger, ensuring dimensional accuracy and surface finish. Metal components such as mounting base 201, second flange 202, first flange 101, and gantry 102 are made of heat-resistant cast steel or stainless steel and are machined and surface treated with high-temperature resistance after being cast or welded.

[0038] During on-site installation, first fix the mounting base 201 to the center position of the furnace cover mounting flange, then insert the second washer 205, boss 207, and first washer 203 in sequence, and tighten the second flange 202 to complete the assembly of the centering component 200. Next, insert the plunger from the upper end of the cylinder 206, embed the guide ring 306, and install the upper end cover 208. Then, hoist the gantry frame 102 and the linear drive module 103 into place, and connect the connecting rod 104 and the transmission rod 301 through the coupling 105. Finally, connect the side conveying component 400, adjust the height of the bracket 405 to support the middle section of the flow channel body 402, tighten the clamps 406 at both ends, and complete the assembly of the entire device.

[0039] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A quantitative conveying device for molten metal in aluminum alloy die casting, comprising a drive assembly (100), characterized in that: A centering component (200) is fixed below the driving component (100), and a metering component (300) is coaxially installed inside the centering component (200). A conveying component (400) is connected to the liquid outlet end of the metering component (300). The centering assembly (200) includes a mounting base (201), the inner wall of which is provided with a boss (204), a second washer (205) is placed on the upper end face of the boss (204), a cylinder (206) is coaxially provided inside the mounting base (201), an end cap (208) is fixed to the top of the cylinder (206), and a boss (207) extends outward from the upper part of the cylinder (206), the boss (207) supporting the second washer (205). Above the boss (205), the upper end face of the boss (207) is provided with a first washer (203), and the top of the mounting base (201) is fixed with a second flange (202). The boss (207), the first washer (203), and the second washer (205) cooperate to form a spherical hinge pair. A radial gap is left between the inner wall of the mounting base (201) and the outer edge of the boss (207). A radial gap is left between the outer wall of the cylinder body (206) and the center hole of the second flange (202). The lower surface of the boss (207) is an outwardly convex spherical surface, and the upper surface is an inwardly concave spherical surface. The lower surface of the first washer (203) is a convex spherical surface that matches the upper surface of the boss (207), and the upper surface of the second washer (205) is a concave spherical surface that matches the lower surface of the boss (207). All spherical surfaces share the same center of curvature and are located on the axis of the cylinder (206). The metering component (300) includes a plunger coaxially disposed inside the cylinder (206). The upper section of the plunger is provided with a plunger sealing section (302), and the plunger sealing section (302) and the inner wall of the cylinder (206) are in a precision clearance fit. A transmission rod (301) extends upward from the center of the upper end of the plunger. Multiple axial through holes (308) are evenly distributed along the circumference on the plunger body next to the root of the transmission rod (301) to connect the lower cavity of the plunger with the upper cavity. The working section of the plunger has a three-stage stepped structure, consisting of a plunger sealing section (302), a plunger pressure stabilizing section (304), and a plunger guide section (305) from top to bottom. The diameter of each section increases sequentially, and the sections are smoothly transitioned by a conical surface. A transmission rod (301) extends above the plunger sealing section (302). The outer circular surface of the plunger sealing section (302) is provided with a plurality of micro-grooves (303). The plurality of micro-grooves (303) are closed independent structures, and the plurality of micro-grooves (303) are arranged at equal intervals along the axial direction of the plunger sealing section (302). The cross section of each micro-groove (303) is semi-circular. The lower part of the inner wall of the cylinder (206) is provided with a slot (209), and a guide ring (306) is embedded in the slot (209). The inner hole of the guide ring (306) is in clearance fit with the plunger guide section (305) to form a radial constraint on the lower end of the plunger.

2. The molten metal conveying device for aluminum alloy die casting according to claim 1, characterized in that: The drive assembly (100) includes a first flange (101), a gantry (102) is fixed to the upper end of the first flange (101), a linear drive module (103) is installed on the top of the gantry (102), and a connecting rod (104) and a coupling (105) are connected in sequence to the output end of the linear drive module (103). The connecting rod (104) is fixedly connected to the transmission rod (301) at the upper end of the plunger through the coupling (105).

3. The molten metal conveying device for aluminum alloy die casting according to claim 1, characterized in that: The cylinder body (206) has symmetrically arranged liquid inlets (210) at the bottom. Each liquid inlet (210) has a one-way valve (307) on one side. Each one-way valve (307) includes a liquid inlet pipe (3071) connected to the liquid inlet (210). The lower end of the liquid inlet pipe (3071) is connected to a valve seat (3072). The valve seat (3072) has a conical sealing surface (3073) machined in the inner hole. The valve seat (3072) has a freely movable valve core (3074) on the inner side. The valve core (3074) sits on the conical sealing surface (3073) by gravity.

4. The molten metal conveying device for aluminum alloy die casting according to claim 3, characterized in that: The valve seat (3072) has two symmetrically arranged stops (3075) on its inner side. The two stops (3075) are fixed on the upper sides of the valve core (3074). Each stop (3075) has an arc-shaped surface that matches the spherical surface of the valve core (3074) on the side facing the valve core (3074) to limit the maximum opening stroke of the valve core (3074).

5. The molten metal conveying device for aluminum alloy die casting according to claim 1, characterized in that: The conveying assembly (400) includes a flow channel body (402), the outer wall of the flow channel body (402) is wrapped with a heat insulation layer (403), a protective sleeve (404) is fitted on the outside of the heat insulation layer (403), the inlet end of the flow channel body (402) is connected to an outlet pipe (401), the outlet pipe (401) is connected to the outlet port (211) on the side of the cylinder (206), and both ends of the flow channel body (402) are fitted to the docking end face through a conical hard seal.

6. The molten metal conveying device for aluminum alloy die casting according to claim 5, characterized in that: The flow channel body (402) has clamps (406) at both ends to press and seal. The flow channel body (402) has brackets (405) symmetrically arranged below the middle section. The upper end of each bracket (405) supports the bottom of the protective sleeve (404) through a flexible pad.

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