A low-pressure casting machine with counter-pressure bubble removal function

Abstract

A low-pressure casting machine with a counter-pressure bubble removal function belongs to the technical field of low-pressure casting machines. It is designed to solve the problems of low production efficiency of casting machines and easy generation of holes on workpieces. The present invention allows a movable rod to enter a first guide groove, and negative pressure is generated inside the piston cylinder, which eventually squeezes and ruptures the bubbles inside the molten metal between the upper die and the lower die, and then water-cools and dissipates the heat through the inlet and outlet water pipes on the upper die and the lower die to solidify it, effectively preventing bubbles from causing the casting to fail to meet the standards. When the guide plate is driven by the second gear to rotate counterclockwise, the three groups of sliders approach each other, causing the upper die to move upward and separate from the lower die. Under the action of the tooth plate, the support plate extends between the upper die and the lower die and is located below the casting. The casting is demolded from below the upper die with manual assistance and falls on the support plate. When the casting falls, under the resetting action of the second spring, the support plate supports the casting to reset, thereby realizing convenient demolding of the casting.

Description

Technical Field

[0001] The invention relates to the technical field of low-pressure casting machines, and in particular to a low-pressure casting machine with a back-pressure bubble removal function. Background Art

[0002] A low-pressure casting machine is a metal casting device that uses a low-pressure method to inject molten metal into a mold, and by applying a relatively low pressure, the metal fully fills the mold cavity and forms the desired casting. For example, the Chinese patent with the publication number CN108262462B discloses a low-pressure casting machine, including a workbench, a heat preservation furnace is provided inside the workbench, a liquid riser is provided inside the heat preservation furnace, a calibration block is provided on the top of the heat preservation furnace, and the calibration block is arranged outside the liquid riser. A lower mold is provided on the top of the workbench, an upper mold is provided on the top of the lower mold, and mounting holes are provided at the four corners of the top of the upper mold, and a top mold is provided on the top of the upper mold. The sleeve is driven upward by a screw rod, thereby driving the pressing plate, the upper mold, the top mold and the finished product to move upward, the roller is movably connected with the slide rail, the lug slides in the guide rail, the demoulding is stable, and the finished product will not be damaged. The double-axis motor drives the receiving barrel and the connecting rod to rotate, and the receiving barrel rotates to make the finished product dissipate heat faster. The connecting rod drives the cleaning cotton to rotate to clean the lower cavity. When the lower mold and the upper mold are in position, the position is accurately fixed, the use is convenient, and the casting quality is high.

[0003] At present, the existing casting machines often use a single mold to cast metal, that is, only one casting can be cast at a time, and the casting takes a long time to cool. If it is demolded too early and the next casting is carried out, it is easy to cause the casting to be unstable and deformed. Due to the complex structure of the cavity inside the mold, bubbles are often easily generated inside during casting, resulting in holes on the surface of the workpiece that do not meet the standards.

[0004] To solve the above problems, a low-pressure casting machine with a back-pressure bubble removal function is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a low-pressure casting machine with a back-pressure bubble removal function, which solves the problem that the existing casting machine in the background technology has low production efficiency and is prone to holes on the workpiece.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a low-pressure casting machine with a counter-pressure bubble removal function, comprising a base and a rotating seat rotatably arranged on the base, a mold is evenly distributed on the top of the rotating seat, and a negative pressure component is also evenly distributed on the top of the rotating seat, the base is annular, and a liquid injection component is arranged below the middle of the bottom of the base, and the liquid injection component includes a box body, the base and the box body are fixedly installed on the ground, a fixed column is installed on the top of the box body, the top of the fixed column passes through the rotating seat upward and is connected to the fixed seat, and the fixed seat is used to guide the negative pressure component and then perform negative pressure bubble removal on the mold;

[0007] The fixed column is provided with a flow channel inside, and the flow channel is L-shaped. The box body is provided with a liquid inlet pipe, and the liquid inlet pipe is connected with one end of the flow channel. A plurality of groups of external insulation layers are evenly distributed on the outside of the fixed column, and a circulation pipe and an electric heating pipe are provided in the external insulation layer, and the circulation pipe corresponds to the other end of the flow channel, and the electric heating pipe surrounds and wraps the outside of the circulation pipe, and the electric heating pipe is used to heat the circulation pipe to prevent the metal liquid from solidifying. The mold comprises an upper mold and a lower mold, and the upper mold and the lower mold are externally connected to the water inlet and outlet pipes, and the upper mold and the lower mold are provided with a heat dissipation cavity inside. An inner cavity for metal liquid molding is provided between the upper mold and the lower mold, and the lower mold is fixedly connected to the top of the rotating seat, and the upper mold is movably arranged above the lower mold, and the top of the upper mold is covered with a fixed plate, and the top of the upper mold is provided with a negative pressure hole connected with its inner cavity, and the bottom of the lower mold is provided with a casting pipe connected with the other end of the circulation pipe, and the casting pipe is connected with the inner cavity of the lower mold;

[0008] The negative pressure assembly includes a piston cylinder installed on the top of a rotating seat through a bracket, a piston plate is slidably connected in the piston cylinder, a movable rod is installed on one side of the piston plate, a first spring is installed between the other side of the piston plate and the inner wall of the piston cylinder, a pressure relief hole is provided at one end of the piston cylinder, a connecting pipe is installed between the lower part of the end of the piston cylinder away from the pressure relief hole and the fixed plate, the connecting pipe is a metal hose, a first guide groove and a second guide groove are provided on the top of the fixed seat, the first guide groove and the second guide groove are both arc-shaped, wherein the diameter of the second guide groove is smaller than the diameter of the first guide groove, the second guide groove and the first guide groove form a closed shape, and the other end of the movable rod is slidably connected in the second guide groove and the first guide groove.

[0009] Furthermore, a filling port is installed on the upper side of one side of the box body, and a boosting pipe is installed on the upper side of the other side of the box body. The boosting pipe is externally connected to a boosting pump, and the boosting pump works to transport the metal liquid in the box through the liquid inlet pipe.

[0010] Furthermore, a locking mechanism is provided in the mold corresponding to the interior of the rotating seat, and the locking mechanism includes a rotating rod rotatably connected to the outer wall of the upper mold, and three groups of rotating rods are provided. The other end of the rotating rod is rotatably connected to a slider, and a sliding groove for sliding of the slider is provided on the top of the rotating seat.

[0011] Furthermore, the locking mechanism also includes a guide plate rotatably connected to the inside of the rotating seat, the outer edge of the guide plate has teeth evenly distributed, the teeth of the guide plate are exposed from the outer edge of the rotating seat, the guide plate is provided with a third guide groove extending from the inside to the outside, the third guide groove is provided in three groups, the three groups of third guide grooves are independent spiral shapes, the bottom of the slider is fixedly connected to a guide column, the guide column is movably arranged in the third guide groove, the top inner edge of the base is fixedly connected to a rack, and the rack corresponds to the guide plate.

[0012] Furthermore, a driving assembly is installed on one side of the base, and the driving assembly includes a motor, a first gear, a second outer disk, an inner disk, a first outer disk and a gear set arranged in sequence from bottom to top.

[0013] Furthermore, the motor is fixedly connected to the bottom outer edge of the base, the motor output end passes through the first gear and the second outer disk and is fixedly connected to the inner disk, ratchets are evenly distributed on the inner disk, the ratchets are rotatably connected to the outside of the inner disk, and a spring is installed between the ratchets and the outer wall of the inner disk.

[0014] Furthermore, the ratchet is provided with two layers, an upper layer and an lower layer, and the ratchet teeth of the two layers are opposite, and the ratchet teeth of the two layers correspond to the inner sides of the first outer disk and the second outer disk respectively, and when the inner disk rotates clockwise, it can drive the first outer disk to rotate, and when the inner disk rotates counterclockwise, it can drive the second outer disk to rotate, the second outer disk is fixedly connected to the first gear, and the second outer disk and the first gear are rotatably connected to the base, and a tooth groove is provided on the outer side of the rotating seat, and the first gear is meshed with the tooth groove, and when the motor drives the inner disk to rotate counterclockwise, the second outer disk and the first gear drive the rotating seat to rotate.

[0015] Furthermore, the gear set includes a second gear fixedly connected to the first outer disk, a third gear is fixedly connected to the top of the second gear via a shaft, and the second gear is meshingly connected to the guide disk.

[0016] Furthermore, a material receiving mechanism is provided on one side of the base, and the material receiving mechanism includes an outer shell fixedly connected to one side of the base, a supporting plate is slidably connected inside the outer shell, a second spring is installed between one side of the supporting plate and the outer shell, a tooth plate is slidably connected below the supporting plate, a third spring is fixedly connected to the rear of the tooth plate, and the tooth plate corresponds to the gear set.

[0017] Furthermore, slots are evenly distributed on the top outer edge of the rotating seat, and the slots correspond to the tooth plates.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention provides a low-pressure casting machine with a counter-pressure bubble removal function. The movable rod enters the first guide groove, and negative pressure is generated inside the piston cylinder, which eventually squeezes and ruptures the bubbles inside the molten metal between the upper die and the lower die. Then, water cooling and heat dissipation are performed through the inlet and outlet water pipes on the upper die and the lower die to solidify the molten metal, effectively preventing bubbles from causing the casting to fail to meet the standards.

[0020] 2. The present invention provides a low-pressure casting machine with a counter-pressure bubble removal function. The inner disk is driven by a motor to rotate clockwise, so that the inner disk, the first outer disk and the gear set rotate clockwise. When the second gear drives the guide disk to rotate counterclockwise, the three groups of sliders approach each other, so that the upper mold moves upward and separates from the lower mold. Under the action of the tooth plate, the support plate extends between the upper mold and the lower mold and is located below the casting. The casting is demoulded from the bottom of the upper mold with manual assistance and falls on the support plate. When the support plate extends under the casting, the tooth plate is inserted into the slot and accurately positioned. When the casting falls, under the resetting action of the second spring, the support plate supports the casting to reset, thereby realizing convenient demoulding of the casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a disassembled diagram of the overall structure of the present invention;

[0023] Figure 3 It is a cross-sectional view of the structure of the liquid injection component of the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the fixing seat and the negative pressure assembly of the present invention;

[0025] Figure 5 It is a cross-sectional view of the structure of the negative pressure assembly of the present invention;

[0026] Figure 6 It is a schematic diagram of the rotating seat and the mold structure of the present invention;

[0027] Figure 7 It is a schematic diagram of the structure of the mold and the locking mechanism of the present invention;

[0028] Figure 8 It is an exploded view of the mold structure of the present invention;

[0029] Fig. 9 It is a schematic diagram of the structure of the driving assembly and the material receiving mechanism of the present invention;

[0030] Fig.10 It is an exploded view of the drive assembly and material receiving mechanism structure of the present invention;

[0031] Fig.11 It is an exploded view of the drive assembly structure of the present invention.

[0032] In the figure: 1, base; 11, rack; 2, rotating seat; 21, tooth groove; 3, fixed seat; 31, first guide groove; 32, second guide groove; 4, injection assembly; 41, box; 411, filling port; 412, booster pipe; 413, liquid inlet pipe; 42, fixed column; 421, flow channel; 43, outer insulation layer; 44, circulation pipe; 45, electric heating pipe; 5, mold; 51, upper mold; 511, negative pressure hole; 52, lower mold; 521, casting pipe; 53, fixed plate; 6, locking mechanism; 61, rotating rod; 62, slider; 621, slide groove; 63 , guide column; 64, guide plate; 65, third guide groove; 7, negative pressure assembly; 71, piston cylinder; 711, pressure relief hole; 72, piston plate; 73, movable rod; 74, first spring; 75, connecting pipe; 8, driving assembly; 81, motor; 82, inner plate; 821, ratchet; 83, first outer plate; 84, second outer plate; 85, first gear; 86, gear set; 861, second gear; 862, third gear; 9, material receiving mechanism; 91, outer shell; 92, supporting plate; 93, second spring; 94, tooth plate; 95, third spring; 96, slot. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In order to solve the technical problems of low production efficiency of casting machines and easy holes on workpieces, such as Figure 1-Figure 5 As shown, the following preferred technical solutions are provided:

[0035] A low-pressure casting machine with a counter-pressure bubble removal function comprises a base 1 and a rotating seat 2 rotatably arranged on the base 1, a mold 5 is evenly distributed on the top of the rotating seat 2, and a negative pressure component 7 is also evenly distributed on the top of the rotating seat 2, characterized in that: the base 1 is annular, a liquid injection component 4 is arranged below the middle of the bottom of the base 1, the liquid injection component 4 comprises a box body 41, the base 1 and the box body 41 are both fixedly installed on the ground, a fixed column 42 is installed on the top of the box body 41, the top of the fixed column 42 passes through the rotating seat 2 upward and is connected to the fixed seat 3, and the fixed seat 3 is used to guide the negative pressure component 7 and then perform negative pressure bubble removal on the mold 5;

[0036] The fixed column 42 is provided with a flow channel 421 inside, and the flow channel 421 is L-shaped. A liquid inlet pipe 413 is provided in the box body 41, and the liquid inlet pipe 413 is connected with one end of the flow channel 421. A plurality of groups of outer insulation layers 43 are evenly distributed on the outside of the fixed column 42, and a circulation pipe 44 and an electric heating pipe 45 are provided in the outer insulation layer 43. The circulation pipe 44 corresponds to the other end of the flow channel 421, and the electric heating pipe 45 is wrapped around the outside of the circulation pipe 44. The electric heating pipe 45 is used to heat the circulation pipe 44 to prevent the metal liquid from solidifying. The mold 5 includes an upper mold 51 and a lower mold 52. The upper mold 51 and the lower mold 52 are externally connected to the water inlet and outlet pipes. The upper mold 51 and the lower mold 52 are both provided with heat dissipation cavities inside, and a heat dissipation chamber for the metal liquid is provided between the upper mold 51 and the lower mold 52. The molding inner cavity, the lower mold 52 is fixedly connected to the top of the rotating seat 2, the upper mold 51 is movably arranged above the lower mold 52, the top of the upper mold 51 is covered with a fixed plate 53, the top of the upper mold 51 is provided with a negative pressure hole 511 connected to its inner cavity, the bottom of the lower mold 52 is provided with a casting pipe 521 connected to the other end of the flow pipe 44, and the casting pipe 521 is connected to the inner cavity of the lower mold 52, the molten metal liquid is stored in the box body 41, and can enter the multiple groups of flow pipes 44 respectively through the liquid inlet pipe 413, and finally enter between the upper mold 51 and the lower mold 52 through the casting pipe 521, when the outer insulation layer 43 is not aligned with the flow channel 421, the metal liquid in the flow pipe 44 will not solidify under the action of the outer insulation layer 43 and the electric heating pipe 45;

[0037] The negative pressure assembly 7 includes a piston cylinder 71 mounted on the top of the rotating seat 2 through a bracket, a piston plate 72 is slidably connected in the piston cylinder 71, a movable rod 73 is installed on one side of the piston plate 72, a first spring 74 is installed between the other side of the piston plate 72 and the inner wall of the piston cylinder 71, a pressure relief hole 711 is provided at one end of the piston cylinder 71, a connecting pipe 75 is installed between the lower end of the piston cylinder 71 away from the pressure relief hole 711 and the fixed plate 53, and the connecting pipe 75 is a metal hose, and a first guide groove 31 and a second guide groove 32 are provided on the top of the fixed seat 3. The groove 32, the first guide groove 31 and the second guide groove 32 are all arc-shaped, wherein the diameter of the second guide groove 32 is smaller than the diameter of the first guide groove 31, the second guide groove 32 and the first guide groove 31 form a closed shape, and the other end of the movable rod 73 is slidably connected in the second guide groove 32 and the first guide groove 31, and the movable rod 73 is guided by the first guide groove 31 and the second guide groove 32, so that the piston plate 72 slides in the piston cylinder 71, prompting the connecting tube 75 to generate negative pressure, thereby sucking the inner cavity between the upper mold 51 and the lower mold 52.

[0038] A filling port 411 is installed on one side of the box body 41 , and a boosting pipe 412 is installed on the other side of the box body 41 . The boosting pipe 412 is externally connected to a boosting pump. When the boosting pump works, the metal liquid in the box body 41 is transported through the liquid inlet pipe 413 .

[0039] In order to solve the technical problem of inconvenient demoulding after continuous casting, such as Figure 1-Figure 2 and Figure 6-Figure 11 As shown, the following preferred technical solutions are provided:

[0040] A locking mechanism 6 is provided inside the rotating seat 2 corresponding to the mold 5. The locking mechanism 6 includes a rotating rod 61 rotatably connected to the outer wall of the upper mold 51. The rotating rod 61 is provided with three groups. The other end of the rotating rod 61 is rotatably connected to a slider 62. The top of the rotating seat 2 is provided with a slide groove 621 for the slider 62 to slide.

[0041] The locking mechanism 6 also includes a guide plate 64 rotatably connected to the inside of the rotating seat 2, the outer edge of the guide plate 64 has teeth evenly distributed, the teeth of the guide plate 64 are exposed from the outer edge of the rotating seat 2, and a third guide groove 65 extending from the inside to the outside is provided on the guide plate 64. The third guide groove 65 is provided in three groups, and the three groups of third guide grooves 65 are independent spiral shapes. The bottom of the slider 62 is fixedly connected to a guide column 63, and the guide column 63 is movably arranged in the third guide groove 65. The top inner edge of the base 1 is fixedly connected to a rack 11, and the rack 11 corresponds to the guide plate 64.

[0042] A driving assembly 8 is installed on one side of the base 1, and the driving assembly 8 includes a motor 81, a first gear 85, a second outer disk 84, an inner disk 82, a first outer disk 83 and a gear set 86 arranged in sequence from bottom to top, wherein the second outer disk 84 and the inner disk 82 form a ratchet structure, and the inner disk 82 and the first outer disk 83 form a ratchet structure.

[0043] The motor 81 is fixedly connected to the bottom outer edge of the base 1, and the output end of the motor 81 passes through the first gear 85 and the second outer disk 84 and is fixedly connected to the inner disk 82. Ratchet teeth 821 are evenly distributed on the inner disk 82. The ratchet teeth 821 are rotatably connected to the outer side of the inner disk 82, and a spring is installed between the ratchet teeth 821 and the outer wall of the inner disk 82.

[0044] The ratchet teeth 821 are provided with two layers, an upper layer and an lower layer, and the ratchet teeth 821 of the two layers are opposite to each other. The ratchet teeth 821 of the two layers correspond to the inner sides of the first outer disk 83 and the second outer disk 84 respectively. When the inner disk 82 rotates clockwise, the first outer disk 83 can be driven to rotate. When the inner disk 82 rotates counterclockwise, the second outer disk 84 can be driven to rotate. The second outer disk 84 is fixedly connected to the first gear 85. The second outer disk 84 and the first gear 85 are rotatably connected to the base 1. A tooth groove 21 is provided on the outer side of the rotating seat 2. The first gear 85 is meshed with the tooth groove 21. When the motor 81 drives the inner disk 82 to rotate counterclockwise, the second outer disk 84 and the first gear 85 drive the rotating seat 2 to rotate.

[0045] The gear set 86 includes a second gear 861 fixedly connected to the first outer disk 83 . A third gear 862 is fixedly connected to the top of the second gear 861 via a shaft. The second gear 861 is meshingly connected to the guide disk 64 .

[0046] A material receiving mechanism 9 is provided on one side of the base 1, and the material receiving mechanism 9 includes a shell 91 fixedly connected to one side of the base 1, a supporting plate 92 is slidably connected inside the shell 91, a second spring 93 is installed between one side of the supporting plate 92 and the shell 91, a tooth plate 94 is slidably connected below the supporting plate 92, a third spring 95 is fixedly connected to the rear of the tooth plate 94, and the tooth plate 94 corresponds to the gear set 86, and the third spring 95 is in contact with the inner wall of the shell 91 but not fixed.

[0047] Slots 96 are evenly distributed on the top outer edge of the rotating seat 2, and the slots 96 correspond to the tooth plates 94. When the motor 81 drives the inner disk 82 to rotate clockwise, the second gear 861 and the third gear 862 can be driven to rotate clockwise through the first outer disk 83. Under the action of the third spring 95, the tooth plate 94 is meshed with the third gear 862. When the gear set 86 rotates, the tooth plate 94 and the supporting plate 92 extend between the upper mold 51 and the lower mold 52 to support the formed casting.

[0048] Specifically, Figure 1As shown, at position A, the metal liquid inside the box body 41 enters the inner cavity between the upper mold 51 and the lower mold 52 through the liquid inlet pipe 413, the flow channel 421, the circulation pipe 44 and the casting pipe 521. At this time, the movable rod 73 is located inside the second guide groove 32. When the metal liquid is injected, the motor 81 drives the inner disk 82 to rotate counterclockwise, and the inner disk 82 drives the second outer disk 84 and the first gear 85 to engage the tooth groove 21 to drive the rotating seat 2 to rotate clockwise. At this time, the movable rod 73 enters the first In the guide groove 31, negative pressure is generated inside the piston cylinder 71, which eventually squeezes and ruptures the bubbles inside the molten metal between the upper mold 51 and the lower mold 52, and then cools the molten metal through the water inlet and outlet pipes on the upper mold 51 and the lower mold 52 to solidify. When the mold 5 rotates clockwise from position A to position B, the motor 81 drives the inner disk 82 to rotate clockwise, causing the inner disk 82, the first outer disk 83 and the gear set 86 to rotate clockwise, and the second gear 861 drives the guide disk 64 to rotate counterclockwise. When the third gear 862 rotates, the three groups of sliders 62 approach each other, so that the upper mold 51 moves upward and separates from the lower mold 52. During the rotation of the third gear 862, under the action of the toothed plate 94, the support plate 92 extends between the upper mold 51 and the lower mold 52 and is located below the casting. The casting is demoulded from below the upper mold 51 by manual assistance and falls on the support plate 92. When the support plate 92 extends below the casting, the toothed plate 94 is inserted into the slot 96 for accurate positioning. When the casting falls, the motor 81 drives the inner The disk 82 rotates counterclockwise, and the rotating seat 2 rotates clockwise. The slot 96 on the rotating seat 2 causes the tooth plate 94 to also move. The tooth plate 94 compresses the third spring 95 and disengages from the gear set 86. At this time, under the reset action of the second spring 93, the support plate 92 supports the casting to reset. During the process of the mold 5 on the rotating seat 2 rotating from the B position to the A position, under the action of the rack 11, the guide disk 64 rotates clockwise, and finally at the A position, the upper mold 51 and the lower mold 52 are tightly combined.

[0049] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A low-pressure casting machine with a back-pressure bubble removal function, comprising a base (1) and a rotating seat (2) rotatably arranged on the base (1), a mold (5) being evenly distributed on the top of the rotating seat (2), and a negative pressure component (7) being evenly distributed on the top of the rotating seat (2), characterized in that: The base (1) is annular, and a liquid injection assembly (4) is arranged below the middle of the bottom of the base (1). The liquid injection assembly (4) comprises a box (41). The base (1) and the box (41) are both fixedly mounted on the ground. A fixing column (42) is installed on the top of the box (41). The top of the fixing column (42) passes through the rotating seat (2) upward and is connected to the fixing seat (3). The fixing seat (3) is used to guide the negative pressure assembly (7) and thus discharge bubbles from the mold (5) under negative pressure. The mold (5) comprises an upper mold (51) and a lower mold (52), the upper mold (51) and the lower mold (52) are externally connected to water inlet and outlet pipes, and the upper mold (51) and the lower mold (52) are both provided with heat dissipation cavities, and an inner cavity for metal liquid molding is provided between the upper mold (51) and the lower mold (52), the lower mold (52) is fixedly connected to the top of the rotating seat (2), the upper mold (51) is movably arranged above the lower mold (52), the top of the upper mold (51) is covered with a fixed plate (53), and the top of the upper mold (51) is provided with a negative pressure hole (511) communicating with its inner cavity; The negative pressure assembly (7) comprises a piston cylinder (71) mounted on the top of the rotating seat (2) via a bracket, a piston plate (72) being slidably connected inside the piston cylinder (71), a movable rod (73) being mounted on one side of the piston plate (72), a first spring (74) being mounted between the other side of the piston plate (72) and the inner wall of the piston cylinder (71), a pressure relief hole (711) being arranged at one end of the piston cylinder (71), a pressure relief hole (711) being arranged at one end of the piston cylinder (71) away from the movable rod (73), and a lower portion of the piston cylinder (71) away from the pressure relief hole (711) being in contact with the fixed plate (53). A connecting pipe (75) is installed between the mold (5) and the piston cylinder (71). The connecting pipe (75) is a metal hose. The connecting pipe (75) connects the inner cavity of the mold (5) and the inner cavity of the piston cylinder (71). The top of the fixed seat (3) is provided with a first guide groove (31) and a second guide groove (32). The first guide groove (31) and the second guide groove (32) are both in an arc shape, wherein the diameter of the second guide groove (32) is smaller than the diameter of the first guide groove (31). The second guide groove (32) and the first guide groove (31) form a closed shape. The other end of the movable rod (73) is slidably connected in the second guide groove (32) and the first guide groove (31).

2. A low-pressure casting machine with a back-pressure bubble removal function as claimed in claim 1, characterized in that: A flow channel (421) is provided inside the fixed column (42), and the flow channel (421) is L-shaped. A liquid inlet pipe (413) is provided inside the box body (41), and the liquid inlet pipe (413) is connected to one end of the flow channel (421). Multiple groups of outer insulation layers (43) are evenly distributed outside the fixed column (42), and a circulation pipe (44) and an electric heating pipe (45) are provided inside the outer insulation layer (43). The circulation pipe (44) corresponds to the other end of the flow channel (421), and the electric heating pipe (45) surrounds and wraps around the outside of the circulation pipe (44). The electric heating pipe (45) is used to heat the circulation pipe (44) to prevent the metal liquid from solidifying. A casting pipe (521) connected to the other end of the circulation pipe (44) is provided at the bottom of the lower mold (52), and the casting pipe (521) is connected to the inner cavity of the lower mold (52).

3. A low-pressure casting machine with a back-pressure bubble removal function as claimed in claim 1, characterized in that: A filling port (411) is installed on the upper side of one side of the box body (41), and a boosting pipe (412) is installed on the upper side of the other side of the box body (41). The boosting pipe (412) is externally connected to a boosting pump. When the boosting pump is in operation, the metal liquid in the box body (41) is transported through the liquid inlet pipe (413).

4. A low-pressure casting machine with a back-pressure bubble removal function as claimed in claim 3, characterized in that: The interior of the rotating seat (2) is provided with a locking mechanism (6) corresponding to the mold (5), the locking mechanism (6) comprising a rotating rod (61) rotatably connected to the outer wall of the upper mold (51), the rotating rod (61) being provided with three groups, the other end of the rotating rod (61) being rotatably connected to a slider (62), the top of the rotating seat (2) being provided with a slide groove (621) for the slider (62) to slide, the locking mechanism (6) further comprising a guide plate (64) rotatably connected to the interior of the rotating seat (2), the outer edge of the guide plate (64) being provided with teeth evenly distributed thereon. The guide plate (64) is exposed from the outer edge of the rotating seat (2) at the tooth position, the guide plate (64) is provided with a third guide groove (65) extending from the inside to the outside, the third guide groove (65) is provided in three groups, the three groups of third guide grooves (65) are in an independent spiral shape, the bottom of the slider (62) is fixedly connected with a guide column (63), the three guide columns (63) are respectively movably arranged in the three groups of third guide grooves (65), and the top inner edge of the base (1) is fixedly connected with a rack (11), the rack (11) corresponds to the guide plate (64).

5. A low-pressure casting machine with a back-pressure bubble removal function as claimed in claim 4, characterized in that: A drive assembly (8) is mounted on one side of the base (1), and the drive assembly (8) comprises a motor (81), a first gear (85), a second outer disc (84), an inner disc (82), a first outer disc (83), and a gear set (86) which are arranged in sequence from bottom to top.

6. A low-pressure casting machine with a back-pressure bubble removal function as claimed in claim 5, characterized in that: The motor (81) is fixedly connected to the bottom outer edge of the base (1); the output end of the motor (81) passes through the first gear (85) and the second outer disk (84) and is fixedly connected to the inner disk (82); ratchet teeth (821) are evenly distributed on the inner disk (82); the ratchet teeth (821) are rotatably connected to the outer side of the inner disk (82); and a spring is installed between the ratchet teeth (821) and the outer wall of the inner disk (82).

7. A low-pressure casting machine with a back-pressure bubble removal function as claimed in claim 6, characterized in that: The ratchet teeth (821) are provided with two layers, the upper and lower layers of which are opposite to each other. The ratchet teeth (821) of the two layers correspond to the inner sides of the first outer disk (83) and the second outer disk (84), respectively. When the inner disk (82) rotates clockwise, the first outer disk (83) can be driven to rotate. When the inner disk (82) rotates counterclockwise, the second outer disk (84) can be driven to rotate. The second outer disk (84) is fixedly connected to the first gear (85). The second outer disk (84) and the first gear (85) are rotatably connected to the base (1). A tooth groove (21) is provided on the outer side of the rotating seat (2). The first gear (85) is meshedly connected to the tooth groove (21). When the motor (81) drives the inner disk (82) to rotate counterclockwise, the second outer disk (84) and the first gear (85) drive the rotating seat (2) to rotate.

8. A low-pressure casting machine with a back-pressure bubble removal function as claimed in claim 7, characterized in that: The gear set (86) comprises a second gear (861) fixedly connected to the first outer disk (83); a third gear (862) is fixedly connected to the top of the second gear (861) via a shaft; and the second gear (861) is meshingly connected to the guide disk (64).

9. A low-pressure casting machine with a back-pressure bubble removal function as claimed in claim 8, characterized in that: A material receiving mechanism (9) is provided on one side of the base (1), and the material receiving mechanism (9) comprises a shell (91) fixedly connected to one side of the base (1), a supporting plate (92) is slidably connected inside the shell (91), a second spring (93) is installed between one side of the supporting plate (92) and the shell (91), a tooth plate (94) is slidably connected below the supporting plate (92), a third spring (95) is fixedly connected to the rear of the tooth plate (94), and the tooth plate (94) corresponds to the third gear (862) of the gear set (86).

10. A low-pressure casting machine with a back-pressure bubble removal function as claimed in claim 9, characterized in that: Slots (96) corresponding to the mould (5) are evenly distributed on the top outer edge of the rotating seat (2), and the slots (96) correspond to the toothed plate (94).

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