Low-pressure casting machine with adjustable pouring gate

Abstract

The invention relates to the technical field of low-pressure casting machines, and particularly discloses a sprue-adjustable low-pressure casting machine which comprises a heat preservation furnace, a material supplementing opening is formed in the side surface of the heat preservation furnace in a penetrating mode, a one-way valve is arranged at the material supplementing opening, a heat preservation cavity is formed in the upper surface of the heat preservation furnace, and the heat preservation cavity communicates with the material supplementing opening. Operation of the whole machine can be completed only through an external hydraulic system, the production cost is greatly reduced, meanwhile, the use difficulty of the casting machine is reduced, when the top plate moves upwards, the extrusion disc is pulled to move upwards till contact between the extrusion disc and the limiting ring is blocked, and the driving rod and the extrusion disc are separated and reset normally; when the extrusion disc moves upwards, the bottom of the heat preservation cavity is in a negative pressure state, that is, the metal liquid is pumped inwards through the material supplementing opening for supplementing, so that automatic supplementing of the metal liquid in the production process is achieved, the working continuity of the casting machine is greatly improved, the defect that the metal liquid needs to be manually added is overcome, and meanwhile the production cost is further reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of low-pressure casting machines, and specifically relates to a low-pressure casting machine with an adjustable gate. Background Art

[0002] In the casting industry, a low-pressure casting machine is a key device that fills a mold cavity with liquid metal under a low-pressure environment to obtain high-quality castings. A low-pressure casting machine with an adjustable gate can better control the flow rate and filling method of liquid metal through flexible adjustment of the gate, meeting the production requirements of different castings. This device is widely used in fields such as automotive parts manufacturing and aerospace precision casting, and is of great significance for improving the quality of castings and reducing production costs. Through optimizing the gate design and automatic control, it aims to achieve an efficient and precise casting process, promoting the development and innovation of casting technology.

[0003] However, traditional low-pressure casting machines have many deficiencies. In terms of metal liquid replenishment, traditional equipment often relies on manual operation, which not only consumes manpower, but also makes it difficult to accurately grasp the addition timing, easily leading to production interruptions, affecting work continuity, and increasing production costs. At the same time, there are safety hazards in manually adding metal liquid, such as splashing of high-temperature liquid. In terms of mold fixing and replacement, the mold fixing method of traditional casting machines is complex, and the installation and disassembly processes are cumbersome, requiring a lot of time and effort. This not only reduces production efficiency, but also easily causes mold damage or inaccurate installation due to improper operation during frequent mold replacement, affecting the quality of castings. In addition, the gate of traditional low-pressure casting machines is usually fixed, making it difficult to adapt to the requirements of molds with different specifications and shapes, restricting the use range of the equipment and unable to meet diverse production requirements. These problems restrict the application and development of traditional low-pressure casting machines and urgently need to be solved through technological innovation. Summary of the Invention

[0004] (I) Technical Problems to be Solved The present invention provides a low-pressure casting machine with an adjustable gate, which solves the problems mentioned in the above background art.

[0005] (II) Technical Solutions To achieve the above object, the present invention is realized through the following technical solutions: A low-pressure casting machine with an adjustable gate, including a holding furnace, a feeding port is penetrated and opened on the side surface of the holding furnace, and a one-way valve is arranged at the feeding port. A heat preservation cavity is opened on the upper surface of the holding furnace, and the heat preservation cavity is communicated with the feeding port. It further includes: a casting mechanism fixedly installed on the upper surface of the holding furnace; an auxiliary mechanism fixedly installed on the casting mechanism; wherein the casting mechanism includes a sealing cover, the sealing cover is fixedly buckled on the middle upper surface of the holding furnace, sliding rods are symmetrically and fixedly connected to the upper surface of the edge of the holding furnace, a sleeve rod is slidably connected to the outer surface of the sliding rod, and a sliding plate is fixedly connected to the end of the sleeve rod away from the sliding rod.

[0006] According to an embodiment of the present invention, an installation groove is opened on the upper surface of the sealing cover, a lower mold is fixedly embedded in the installation groove, and an upper mold is fixedly connected to the bottom surface of the sliding plate, wherein the upper mold and the lower mold are arranged opposite to each other.

[0007] According to an embodiment of the present invention, a conveying pipe is fixedly penetrated and connected to the upper surface of the installation groove, the bottom of the conveying pipe is arranged at the bottom of the heat preservation cavity, a limiting ring is fixedly connected to the inner surface of the top of the heat preservation cavity, and a pressing disc is slidably connected to the inner surface of the heat preservation cavity, and the middle of the pressing disc is slidably sleeved on the outer surface of the conveying pipe.

[0008] According to an embodiment of the present invention, a driving rod is slidably penetrated and connected to the upper surface of the edge of the sliding plate, a top plate is fixedly connected to the top of the driving rod, a spring is arranged outside the driving rod, the top of the spring is fixedly connected to the lower surface of the top plate, and the bottom of the spring is fixedly connected to the upper surface of the sliding plate.

[0009] According to an embodiment of the present invention, the driving rod is set as an electromagnetic rod, a matching hole is penetrated and opened on the upper surface of the sealing cover, and the bottom of the driving rod is opposite to the matching hole.

[0010] According to an embodiment of the present invention, the auxiliary mechanism includes a plugging groove opened on the upper surface of the edge of the holding furnace, plugging rods are symmetrically and fixedly connected to the bottom surface of the plugging groove, a plugging plate is slidably penetrated and connected to the plugging rods, a corrugated sheet is fixedly connected to the bottom of the plugging plate, and the bottom of the corrugated sheet is fixedly connected to the bottom surface of the plugging groove.

[0011] According to an embodiment of the present invention, a slot is opened on the side surface of the installation groove, an elastic rod is elastically and movably plugged in the slot, a plugging block is fixedly connected to the end of the elastic rod away from the slot, four plugging blocks are fixedly spaced around the central axis of the sealing cover, and connecting rods are slidably plugged at both ends of the plugging block.

[0012] According to an embodiment of the present invention, the four plug-in blocks are combined into a circular ring through a connecting rod. The upper surface of the plug-in block is set as an inclined surface. The combined central axis of the four plug-in blocks and the central axis of the conveying pipe are set as the same central axis. The bottom surface of the lower mold is symmetrically and fixedly connected with inlay blocks, and a pouring pipe is fixedly connected through the middle bottom surface of the lower mold.

[0013] According to an embodiment of the present invention, an extrusion bladder is fixedly connected to the bottom of the plug-in slot. The top of the extrusion bladder is fixedly connected to the bottom surface of the plug-in plate. Sliding grooves are symmetrically opened on the side surface of the installation slot. The sliding grooves communicate with the internal cavity of the extrusion bladder. A fixing rod is elastically slidably connected in the sliding grooves. An insertion opening is opened on the side surface of the inlay block, and the insertion opening is opposite to the fixing rod. The upper surface of the top plate is connected to the hydraulic system. By driving the top plate to move downward through the hydraulic system, when the top plate moves downward, it will first drive the sliding plate to move downward along the sliding rod through the sleeve rod, so that the upper mold and the lower mold are aligned and closed. At this time, as the top plate continues to descend, the elastic force of the spring will be compressed, and the extrusion force generated on the sliding plate will gradually increase, so that the sliding plate firmly presses the upper mold at its bottom on the lower mold. At the same time, the driving rod will move downward relative to the sliding plate. Finally, the bottom of the driving rod enters the interior of the heat preservation furnace through the matching hole on the sealing cover until it contacts the upper surface of the extrusion disk in the heat preservation cavity and is electromagnetically adsorbed on the upper surface of the extrusion disk. At this time, as the top plate continues to move downward, it will push the extrusion disk to move downward along the inner wall of the heat preservation cavity through the driving rod, so that the air pressure in the cavity below the heat preservation cavity begins to slowly increase. The maximum downward movement distance of the extrusion disk does not exceed the feeding port. Under the action of pressure, the molten metal inside is extruded to the cavity of the lower mold at the top of the conveying pipe through the bottom of the conveying pipe to complete pouring. After waiting for molding, moving the top plate upward can open the upper mold and the lower mold to take out the parts.

[0014] (III) Beneficial effects The present invention provides a low-pressure casting machine with an adjustable gate. It has the following beneficial effects: (I). For this low-pressure casting machine with an adjustable gate, the entire machine can be operated only by an external hydraulic system, which greatly reduces the production cost and at the same time reduces the difficulty of using this casting machine. When the top plate moves upward, it will pull the extrusion disk upward until the extrusion disk contacts the limit ring and is blocked, and the driving rod is separated from the extrusion disk and returns to normal. When the extrusion disk moves upward, the bottom of the heat preservation cavity is in a negative pressure state, that is, it starts to draw molten metal into it through the feeding port for supplementation, so as to realize the automatic supplementation of molten metal during the production process, greatly improving the working coherence of this casting machine, avoiding the disadvantage of needing to add molten metal manually, and further reducing the production cost.

[0015] (2) For the low-pressure casting machine with an adjustable gate, when the sliding plate moves downward, it will gradually come into contact with and press the plug-in plate, causing the plug-in plate to move along the plug-in rod into the plug-in groove, that is, the bottom extrusion bladder is pressed by the plug-in plate, increasing the air pressure in the internal cavity of the extrusion bladder. Finally, the internal air pressure is conveyed into the chute, increasing the air pressure inside the chute. Then, the fixed rod is pushed to move outward and finally enters the plug-in port in the inlay block, realizing automatic fixation of the lower mold during casting, greatly improving the working stability of this casting machine. When the casting machine resets, the fixation of the lower mold is automatically unlocked, greatly reducing the disassembly and assembly difficulty of the lower mold and significantly increasing the speed of replacing the lower mold, thereby improving production efficiency.

[0016] (3) For the low-pressure casting machine with an adjustable gate, when the lower mold is normally installed in the installation groove on the sealing cover, the pouring pipe on the lower mold will first come into contact with the upper surface of the plug-in block. After the inclined upper surface of the plug-in block contacts the bottom of the pouring pipe, the plug-in block and the connecting rod start to expand outward under the extrusion state. Finally, the inner surface of the plug-in block fits against the outer surface of the pouring pipe, that is, this casting machine can adapt to lower molds with multiple pouring diameters, realizing variable gates and greatly expanding the application range of this casting machine. Description of the Drawings

[0017] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the structural schematic diagram of the sliding plate and its connection of the present invention; Figure 3 is the structural schematic diagram of the delivery pipe and its connection of the present invention; Figure 4 is the structural schematic diagram of the corrugated sheet and its connection of the present invention; Figure 5 is the structural schematic diagram of the lower mold and its connection of the present invention; Figure 6 is the structural schematic diagram of the elastic rod and its connection of the present invention; Figure 7 is the structural schematic diagram of the inlay block of the present invention; Figure 8 is the structural schematic diagram of the plug-in block of the present invention.

[0018] In the figure: 1, heat preservation furnace; 2, feeding port; 3, heat preservation cavity; 4, casting mechanism; 41, sealing cover; 42, sliding rod; 43, sleeve rod; 44, sliding plate; 45, installation groove; 46, lower mold; 47, upper mold; 48, conveying pipe; 49, limiting ring; 410, extrusion disc; 411, driving rod; 412, top plate; 413, spring; 414, mating hole; 5, auxiliary mechanism; 51, insertion slot; 52, insertion rod; 53, insertion plate; 54, corrugated sheet; 55, slot; 56, elastic rod; 57, insertion block; 58, connecting rod; 59, inlay block; 510, pouring pipe; 511, extrusion bladder; 512, sliding groove; 513, fixing rod; 514, insertion port. Detailed implementation mode

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] The first embodiment: As Figures 1 to 8 shown, the present invention provides a technical solution: A low-pressure casting machine with an adjustable gate, including a heat preservation furnace 1, a feeding port 2 is penetrated and opened on the side surface of the heat preservation furnace 1, and a one-way valve is arranged at the feeding port 2. A heat preservation cavity 3 is opened on the upper surface of the heat preservation furnace 1, and the heat preservation cavity 3 is communicated with the feeding port 2. It further includes: A casting mechanism 4, the casting mechanism 4 is fixedly installed on the upper surface of the heat preservation furnace 1; An auxiliary mechanism 5, the auxiliary mechanism 5 is fixedly installed on the casting mechanism 4; Among them, the casting mechanism 4 includes a sealing cover 41, the sealing cover 41 is fixedly buckled on the middle upper surface of the heat preservation furnace 1, and sliding rods 42 are symmetrically and fixedly connected to the upper surface of the edge of the heat preservation furnace 1. A sleeve rod 43 is slidably connected to the outer surface of the sliding rod 42, and one end of the sleeve rod 43 away from the sliding rod 42 is fixedly connected to a sliding plate 44.

[0021] An installation groove 45 is opened on the upper surface of the sealing cover 41, a lower mold 46 is fixedly inlaid in the installation groove 45, and an upper mold 47 is fixedly connected to the bottom surface of the sliding plate 44, and the upper mold 47 and the lower mold 46 are arranged opposite to each other.

[0022] A conveying pipe 48 is fixedly penetrated and connected to the upper surface of the installation groove 45, the bottom of the conveying pipe 48 is arranged at the bottom of the heat preservation cavity 3, a limiting ring 49 is fixedly connected to the inner surface of the top of the heat preservation cavity 3, and an extrusion disc 410 is slidably connected to the inner surface of the heat preservation cavity 3. The middle part of the extrusion disc 410 is slidably sleeved on the outer surface of the conveying pipe 48.

[0023] On the upper surface of the edge of the sliding plate 44, a driving rod 411 is slidably connected through. At the top of the driving rod 411, a top plate 412 is fixedly connected. On the outer side of the driving rod 411, a spring 413 is arranged. The top of the spring 413 is fixedly connected to the lower surface of the top plate 412, and the bottom of the spring 413 is fixedly connected to the upper surface of the sliding plate 44.

[0024] The driving rod 411 is arranged as an electromagnetic rod. A matching hole 414 is penetrated and opened on the upper surface of the sealing cover 41, and the bottom of the driving rod 411 is aligned with the matching hole 414.

[0025] The second embodiment: As Figures 1 to 8 shown, the auxiliary mechanism 5 includes a plugging groove 51. The plugging groove 51 is opened on the upper surface of the edge of the heat preservation furnace 1. On the bottom surface of the plugging groove 51, plugging rods 52 are symmetrically fixedly connected. On the plugging rods 52, a plugging plate 53 is slidably connected through. At the bottom of the plugging plate 53, a corrugated sheet 54 is fixedly connected. The bottom of the corrugated sheet 54 is fixedly connected to the bottom surface of the plugging groove 51.

[0026] On the side surface of the installation groove 45, a slot 55 is opened. An elastic rod 56 is elastically and movably plugged in the slot 55. At one end of the elastic rod 56 away from the slot 55, a plugging block 57 is fixedly connected. Four plugging blocks 57 are fixedly arranged at equal intervals around the central axis of the sealing cover 41. At both ends of the plugging block 57, a connecting rod 58 is slidably plugged.

[0027] The four plugging blocks 57 are combined into a circular ring through the connecting rod 58. The upper surface of the plugging block 57 is set as an inclined surface. The central axis of the combination of the four plugging blocks 57 and the central axis of the conveying pipe 48 are set as the same central axis. On the bottom surface of the lower mold 46, embedding blocks 59 are symmetrically fixedly connected. In the middle bottom surface of the lower mold 46, a pouring pipe 510 is fixedly connected through.

[0028] At the bottom of the plugging groove 51, an extrusion bladder 511 is fixedly connected. The top of the extrusion bladder 511 is fixedly connected to the bottom surface of the plugging plate 53. On the side surface of the installation groove 45, sliding grooves 512 are symmetrically opened. The sliding grooves 512 are communicated with the internal cavity of the extrusion bladder 511. In the sliding grooves 512, a fixing rod 513 is elastically slidably connected. On the side surface of the embedding block 59, an insertion opening 514 is opened, and the insertion opening 514 is aligned with the fixing rod 513.

[0029] During operation, the upper surface of the top plate 412 is connected to the hydraulic system. The top plate 412 is driven to move downward by the hydraulic system. When the top plate 412 moves downward, it will first drive the sliding plate 44 to move downward along the sliding rod 42 through the sleeve rod 43, so that the upper mold 47 is aligned and closed with the lower mold 46. At this time, as the top plate 412 continues to descend, the elastic force of the spring 413 will be compressed, and then the extrusion force generated on the sliding plate 44 will gradually increase, causing the sliding plate 44 to firmly press the upper mold 47 at its bottom against the lower mold 46. At the same time, the driving rod 411 will move downward relative to the sliding plate 44. Finally, the bottom of the driving rod 411 enters the interior of the heat preservation furnace 1 through the mating hole 414 on the sealing cover 41 until it contacts the upper surface of the extrusion disc 410 in the heat preservation cavity 3 and is electromagnetically adsorbed on the upper surface of the extrusion disc 410. At this time, as the top plate 412 continues to move downward, it will push the extrusion disc 410 to move downward along the inner wall of the heat preservation cavity 3 through the driving rod 411, causing the air pressure in the cavity below the heat preservation cavity 3 to gradually increase. The maximum downward movement distance of the extrusion disc 410 does not exceed the feeding port 2. Under the action of pressure, the molten metal inside it is extruded to the cavity of the lower mold 46 at the top of the delivery pipe 48 through the bottom of the delivery pipe 48 to complete casting. After waiting for the casting to solidify, moving the top plate 412 upward can open the upper mold 47 and the lower mold 46 to take out the parts, that is, the entire machine can be operated only by an external hydraulic system, greatly reducing the production cost and at the same time reducing the operation difficulty of this casting machine. When the top plate 412 moves upward, it will pull the extrusion disc 410 upward until the extrusion disc 410 contacts the limit ring 49 and is blocked, and the driving rod 411 disengages from the extrusion disc 410 and returns to its normal position. When the extrusion disc 410 moves upward, the bottom of the heat preservation cavity 3 is in a negative pressure state, that is, it starts to draw molten metal into it through the feeding port 2 for replenishment, thus realizing the automatic replenishment of molten metal during the production process, greatly improving the working continuity of this casting machine, avoiding the drawback of manual addition of molten metal, and further reducing the production cost. When the sliding plate 44 moves downward, it will gradually contact and squeeze the plug-in plate 53, prompting the plug-in plate 53 to move into the plug-in slot 51 along the plug-in rod 52, that is, the plug-in plate 53 squeezes the extrusion bladder 511 at the bottom, prompting the air pressure in the internal cavity of the extrusion bladder 511 to increase. Finally, the internal air pressure is delivered to the chute 512, causing the air pressure inside the chute 512 to increase, and then pushing the fixed rod 513 to move outward, and finally entering the insertion port 514 in the inlay block 59, realizing the automatic fixation of the lower mold 46 during casting, greatly improving the working stability of this casting machine. When the casting machine resets, the fixation effect on the lower mold 46 is automatically unlocked, greatly reducing the disassembly and assembly difficulty of the lower mold 46 and greatly increasing the speed of replacing the lower mold 46, thereby improving the production efficiency. When the lower mold 46 is normally installed in the installation groove 45 on the sealing cover 41, the pouring pipe 510 on the lower mold 46 will first contact the upper surface of the plug-in block 57.After the insertion block 57 on the inclined upper surface comes into contact with the bottom of the pouring pipe 510, the insertion block 57 and the connecting rod 58 start to expand outwards under the extrusion state, and finally the inner surface of the insertion block 57 fits on the outer surface of the pouring pipe 510, that is, it is realized that this casting machine can adapt to the lower die 46 with various pouring diameters, the pouring gate can be changed, and the application range of this casting machine is greatly improved.

[0030] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0031] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-pressure casting machine with an adjustable gate, comprising a holding furnace (1), characterized in that: A feeding port (2) is formed through the side surface of the heat preservation furnace (1), and a one-way valve is arranged at the feeding port (2). A heat preservation cavity (3) is formed on the upper surface of the heat preservation furnace (1), and the heat preservation cavity (3) is communicated with the feeding port (2). The heat preservation furnace further comprises: A casting mechanism (4) fixedly installed on the upper surface of the heat preservation furnace (1); An auxiliary mechanism (5) fixedly installed on the casting mechanism (4); The casting mechanism (4) includes a sealing cover (41) fixedly buckled on the middle upper surface of the heat preservation furnace (1). Slide bars (42) are symmetrically and fixedly connected to the upper surface of the edge of the heat preservation furnace (1). A sleeve rod (43) is slidably connected to the outer surface of the slide bar (42). A sliding plate (44) is fixedly connected to the end of the sleeve rod (43) away from the slide bar (42).

2. The low-pressure casting machine with an adjustable gate according to claim 1, characterized in that: An installation groove (45) is formed on the upper surface of the sealing cover (41), and a lower mold (46) is fixedly embedded in the installation groove (45). An upper mold (47) is fixedly connected to the bottom surface of the sliding plate (44), and the upper mold (47) is arranged opposite to the lower mold (46).

3. The low-pressure casting machine with an adjustable gate according to claim 2, characterized in that: A delivery pipe (48) is fixedly and penetratingly connected to the upper surface of the installation groove (45). The bottom of the delivery pipe (48) is arranged at the bottom of the heat preservation cavity (3). A limiting ring (49) is fixedly connected to the inner surface of the top of the heat preservation cavity (3). An extrusion disc (410) is slidably connected to the inner surface of the heat preservation cavity (3), and the middle of the extrusion disc (410) is slidably sleeved on the outer surface of the delivery pipe (48).

4. The low-pressure casting machine with an adjustable gate according to claim 3, characterized in that: A driving rod (411) is slidably and penetratingly connected to the upper surface of the edge of the sliding plate (44). A top plate (412) is fixedly connected to the top of the driving rod (411). A spring (413) is arranged outside the driving rod (411). The top of the spring (413) is fixedly connected to the lower surface of the top plate (412), and the bottom of the spring (413) is fixedly connected to the upper surface of the sliding plate (44).

5. The low-pressure casting machine with an adjustable gate according to claim 4, characterized in that: The driving rod (411) is an electromagnetic rod. A matching hole (414) is formed through the upper surface of the sealing cover (41), and the bottom of the driving rod (411) is arranged opposite to the matching hole (414).

6. The low-pressure casting machine with an adjustable gate according to claim 5, wherein: The auxiliary mechanism (5) includes a plug-in slot (51) formed on the upper surface of the edge of the heat preservation furnace (1). Plug-in rods (52) are symmetrically and fixedly connected to the bottom surface of the plug-in slot (51). A plug-in plate (53) is slidably connected through the plug-in rods (52). A corrugated sheet (54) is fixedly connected to the bottom of the plug-in plate (53), and the bottom of the corrugated sheet (54) is fixedly connected to the bottom surface of the plug-in slot (51).

7. An adjustable-gate low-pressure casting machine according to claim 6, wherein: The side surface of the installation groove (45) is provided with a slot (55), an elastic rod (56) is elastically and movably inserted into the slot (55), one end of the elastic rod (56) far away from the slot (55) is fixedly connected with a plugging block (57), four plugging blocks (57) are fixedly arranged at equal intervals around the central axis of the sealing cover (41), and two ends of the plugging block (57) are slidably inserted with a connecting rod (58).

8. An adjustable-gate low-pressure casting machine according to claim 7, characterized in that: The four plugging blocks (57) are combined into a circular ring through the connecting rod (58), the upper surface of the plugging block (57) is an inclined surface, the central axis of the combination of the four plugging blocks (57) and the central axis of the conveying pipe (48) are arranged on the same central axis, the bottom surface of the lower die (46) is symmetrically and fixedly connected with an inlay block (59), and a pouring pipe (510) is fixedly connected through the middle bottom surface of the lower die (46).

9. An adjustable-gate low-pressure casting machine according to claim 8, characterized in that: The bottom of the plugging groove (51) is fixedly connected with an extrusion bladder (511), the top of the extrusion bladder (511) is fixedly connected to the bottom surface of the plugging plate (53), the side surface of the installation groove (45) is symmetrically provided with a sliding groove (512), the sliding groove (512) is communicated with the internal cavity of the extrusion bladder (511), a fixing rod (513) is elastically slidably connected in the sliding groove (512), and an insertion port (514) is arranged on the side surface of the inlay block (59), and the insertion port (514) is opposite to the fixing rod (513).

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