Casting mold cooling device for low-pressure casting

Abstract

The invention relates to the field of metal casting mold cooling, in particular to a casting mold cooling device for low-pressure casting, which comprises a base, a lower mold base arranged at the center of the upper end of the base, an upper mold base arranged at the upper end of the lower mold base, a power connection slide rail arranged at the upper end of the base along the linear direction, and a first cover frame and a second cover frame symmetrically arranged at two ends of the lower mold base, the bottom of the first cover frame and the bottom of the second cover frame are both installed on the power connection sliding rail in a sliding mode, the two faces of the first cover frame and the two faces of the second cover frame are open, and the first cover frame and the second cover frame are close to each other to be closed to form a closed cavity and cover the lower die base and the upper die base in the cavity. Air cooling and water cooling are combined, so that the cooling process of the mold has two different degrees of cooling modes, the two cooling modes can be automatically controlled and switched according to heat dissipation requirements, the heat dissipation effect of the mold is effectively improved, the cooling process is mild, and the cooling efficiency is improved. The influence on the service life and the production efficiency of the mold due to too fast or too slow mold cooling is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of metal casting mold cooling, in particular to a casting mold cooling device for low-pressure casting. Background Art

[0002] Low-pressure casting is a method of filling the mold cavity with liquid metal in the direction of anti-gravity under the action of gas pressure to form a casting. It has the characteristics of stable filling and dense solidification structure. Because the gas pressure used is relatively low, it is called low-pressure casting. The process of low-pressure casting is: dry compressed air is introduced into a sealed crucible (or sealed tank). Under the action of gas pressure, the molten metal rises along the riser and smoothly enters the mold cavity through the gate. After the filling is completed, the gas pressure on the liquid surface in the crucible is maintained until the casting is completely solidified. Then the gas pressure on the liquid surface is released to allow the unsolidified metal liquid in the liquid pipe to flow into the crucible, and then the cylinder opens the mold and pushes out the casting.

[0003] At present, in the low-pressure casting process, in order to improve the casting efficiency, a cooling device is generally used to cool the mold. When cooling, the existing cooling device often directly contacts the mold with cold air or liquid nitrogen for cooling. The cooling speed of cold air is slow, which can easily affect the production efficiency, while the cooling intensity of liquid nitrogen is large. If the cooling speed is too fast, the mold will become brittle and easy to crack. Summary of the invention

[0004] The object of the present invention is to provide a casting mold cooling device for low-pressure casting, aiming to solve the above-mentioned technical problems.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A casting mold cooling device for low-pressure casting includes a base, a lower mold base is arranged at the center of the upper end of the base, an upper mold base is arranged at the upper end of the lower mold base, an electric slide rail is arranged along a straight line at the upper end of the base, a first cover frame and a second cover frame are symmetrically arranged at both ends of the lower mold base, the bottoms of the first cover frame and the second cover frame are both slidably installed on the electric slide rail, the first cover frame and the second cover frame are arranged with openings on two sides, the first cover frame and the second cover frame are closed to each other to form a closed cavity and cover the lower mold base and the upper mold base inside the cavity.

[0006] A first water bag is fixedly arranged on the inner wall of the first cover frame, a first fan is fixedly arranged on the side wall of the first cover frame, the first fan is connected to one end of an air outlet pipe, the other end of the air outlet pipe passes through the first water bag and extends into the frame, a water storage tank is fixedly arranged on the top of the first cover frame, one end of the water storage tank is connected to a water inlet pipe, the water inlet pipe is communicated with the first water bag, and a valve control structure for controlling water inflow is arranged inside the water inlet pipe.

[0007] A second water bag is fixedly arranged on the inner wall of the second cover frame, a second fan is fixedly arranged on the side wall of the second cover frame, the second fan is connected to one end of an air inlet pipe, the other end of the air inlet pipe passes through the second water bag and extends into the frame, a cooler is fixedly arranged on the top of the second cover frame, the cooler is connected to one end of a water outlet pipe, the other end of the water outlet pipe passes through the second cover frame and is connected to the second water bag, and a water pump is fixedly arranged on the water outlet pipe.

[0008] As a further solution of the present invention: raised contact parts are arranged at equal intervals in the longitudinal direction on the surface of the first water bag, a recessed ventilation part is formed between two adjacent raised contact parts, and the second water bag has the same structural arrangement as the first water bag.

[0009] As a further solution of the present invention: the inner cavity of the first water bag is connected with one end of the liquid inlet pipe, the liquid inlet pipe passes through the first water bag and extends into the frame, the inner cavity of the second water bag is connected with the liquid outlet pipe, the liquid outlet pipe passes through the first water bag and extends into the frame, connecting interfaces are provided at both ends of the upper mold base, the liquid inlet pipe and the liquid outlet pipe are respectively aligned with the corresponding connecting interfaces, and a cooling cavity is provided on the inner wall of the lower mold base, and both ends of the cooling cavity are connected with the corresponding connecting interfaces.

[0010] As a further solution of the present invention: a first connecting pipe is provided on one side of the water tank, and a second connecting pipe is provided on one side of the cooler, and the first connecting pipe is aligned and matched with the second connecting pipe.

[0011] As a further solution of the present invention: the valve control structure includes a mercury column, a floating block, an electromagnetic block and a valve core, the mercury column is fixedly arranged in the first cover frame, the bottom end of the mercury column extends into the air outlet pipe, and the top end of the mercury column extends into the water inlet pipe, the floating block is slidably installed in the mercury column and floats up and down with the liquid level of the mercury, the electromagnetic block is fixedly arranged in the water inlet pipe, and the valve core is located above the electromagnetic block and is arranged at the connection point between the water inlet pipe and the first water bag.

[0012] As a further solution of the present invention: a connecting rod is fixedly provided on the top of the floating block, an electrode column is fixedly provided on the top of the connecting rod which slides through the mercury column and fixedly provided with the electrode column, electrical contacts are provided at both ends of the bottom of the electromagnetic block, and both ends of the electrode column are respectively aligned with the corresponding electrical contacts.

[0013] As a further solution of the present invention: a return spring is arranged between the bottom of the valve core and the top of the electromagnetic block, a positioning column is fixedly arranged in the center of the bottom of the valve core, a positioning groove is arranged in the center of the upper end of the electromagnetic block, and the positioning column is adapted to be slidably installed in the positioning groove.

[0014] As a further solution of the present invention: a sealing strip is provided on the upper edge of the side wall of the first cover frame near one end of the lower mold base, and a sealing groove is provided on the upper edge of the side wall of the second cover frame near one end of the lower mold base, and the sealing strip is aligned and matched with the sealing groove.

[0015] The beneficial effects of the present invention are as follows: when the first cover frame and the second cover frame are closed to prepare for cooling the mold, the second fan blows cold air into the closed cavity through the air inlet pipe, and the cold air continuously exchanges heat with the upper mold base and the lower mold base during the circulation process to absorb heat. At the same time, the first fan continuously discharges the hot air after heat exchange through the air outlet pipe, thereby realizing the air cooling process of the mold. During the discharge of hot air, the valve control structure can control the opening and closing state of the water inlet pipe and the first water bag according to the temperature of the discharged air. At the same time, a circulating water system is formed between the water storage tank, the first water bag, the mold, the second water bag and the cooler. When the mold needs to further dissipate heat, cooling water enters the first water bag and the second water bag, causing the first water bag and the second water bag to gradually swell and abut against the surface of the upper mold base and the lower mold base, thereby realizing the water cooling process of the mold. The combination of air cooling and water cooling allows the mold to have two different cooling modes, and can automatically control the switching of the two cooling modes according to the heat dissipation requirements, effectively improving the mold heat dissipation effect and production efficiency, and making the cooling process gentle, avoiding mold cooling too fast or too slow, which affects the mold life and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a structural schematic diagram of the first cover frame in the present invention.

[0019] Figure 3 It is a schematic diagram of the internal structure of the first cover frame in the present invention.

[0020] Figure 4 yes Figure 3 A schematic diagram of the enlarged structure at point A in the middle.

[0021] Figure 5 It is a structural schematic diagram of the electromagnetic block and the valve core in the present invention.

[0022] Figure 6 It is a structural schematic diagram of the second cover frame in the present invention.

[0023] Figure 7 It is a schematic diagram of the internal structure of the second cover frame in the present invention.

[0024] Figure 8It is a closed schematic diagram of the first cover frame and the second cover frame in the present invention.

[0025] Fig. 9 It is a schematic diagram of the internal structure in the closed state of the present invention.

[0026] In the figure: 1, base; 101, power rail; 2, lower die base; 201, cooling cavity; 3, upper die base; 301, communication interface; 4, first cover frame; 41, sealing strip; 42, first water bag; 421, raised contact part; 422, recessed ventilation part; 43, air outlet pipe; 44, liquid inlet pipe; 45, first fan; 46, mercury column; 47, floating block; 471, connecting rod; 472, electrode column; 5. Water storage tank; 51. First connecting pipe; 52. Water inlet pipe; 53. Electromagnetic block; 531. Electrical contact; 532. Positioning slide groove; 54. Valve core; 541. Return spring; 542. Positioning column; 6. Second cover frame; 61. Sealing groove; 62. Second water bag; 63. Air inlet pipe; 64. Liquid outlet pipe; 65. Second fan; 7. Cooler; 71. Second connecting pipe; 72. Water outlet pipe; 73. Water pump. DETAILED DESCRIPTION

[0027] 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.

[0028] See also Figure 1 , Figure 8 and Fig. 9 As shown, the present invention is a casting mold cooling device for low-pressure casting, including a base 1, a lower mold base 2 is arranged at the center of the upper end of the base 1, an upper mold base 3 is arranged at the upper end of the lower mold base 2, and an electric slide rail 101 is arranged along a straight line at the upper end of the base 1, and a first cover frame 4 and a second cover frame 6 are symmetrically arranged at both ends of the lower mold base 2. The bottoms of the first cover frame 4 and the second cover frame 6 are both slidably installed on the electric slide rail 101, and the first cover frame 4 and the second cover frame 6 are arranged with openings on both sides. The first cover frame 4 and the second cover frame 6 are closed to each other to form a closed cavity and cover the lower mold base 2 and the upper mold base 3 inside the cavity.

[0029] Specifically, when mold casting is performed, the first cover frame 4 and the second cover frame 6 slide linearly along the power-connected slide rail 101 and move away from each other, so that the upper mold base 3 and the lower mold base 2 are open and exposed to facilitate the casting operation. When the upper mold base 3 and the lower mold base 2 need to be cooled, the first cover frame 4 and the second cover frame 6 slide in opposite directions along the power-connected slide rail 101 and approach each other until the first cover frame 4 and the second cover frame 6 are sealed and closed, thereby forming a closed cavity inside to cool the upper mold base 3 and the lower mold base 2.

[0030] like Figure 2 and Figure 3 As shown, a first water bag 42 is fixedly provided on the inner wall of the first cover frame 4, a first fan 45 is fixedly provided on the side wall of the first cover frame 4, the first fan 45 is connected to one end of an air outlet pipe 43, the other end of the air outlet pipe 43 passes through the first water bag 42 and extends into the frame, a water storage tank 5 is fixedly provided on the top of the first cover frame 4, one end of the water storage tank 5 is connected to a water inlet pipe 52, the water inlet pipe 52 is communicated with the first water bag 42, and a valve control structure for controlling water inflow is provided inside the water inlet pipe 52.

[0031] like Figure 6 and Figure 7 As shown, a second water bag 62 is fixedly provided on the inner wall of the second cover frame 6, a second fan 65 is fixedly provided on the side wall of the second cover frame 6, the second fan 65 is connected to one end of an air inlet pipe 63, the other end of the air inlet pipe 63 passes through the second water bag 62 and extends into the frame, a cooler 7 is fixedly provided on the top of the second cover frame 6, the cooler 7 is connected to one end of a water outlet pipe 72, the other end of the water outlet pipe 72 passes through the second cover frame 6 and is connected to the second water bag 62, and a water pump 73 is fixedly provided on the water outlet pipe 72.

[0032] Specifically, when the first cover frame 4 and the second cover frame 6 are closed to prepare for cooling the mold, the second fan 65 blows cold air into the closed cavity through the air inlet pipe 63. The cold air continuously exchanges heat with the upper mold base 3 and the lower mold base 2 during circulation to absorb heat. At the same time, the first fan 45 continuously discharges the hot air after heat exchange through the air outlet pipe 43, thereby realizing the air cooling process of the mold. During the discharge of hot air, the valve control structure can control the opening and closing state of the water inlet pipe 52 and the first water bag 42 according to the temperature of the discharged air. At the same time, a circulating water system is formed between the water storage tank 5, the first water bag 42, the mold, the second water bag 62 and the cooler 7. When the mold needs to further dissipate heat, cooling water enters the first water bag 42 and the second water bag 62, so that the first water bag 42 and the second water bag 62 gradually swell and abut against the surface of the upper mold base 3 and the lower mold base 2, thereby realizing the water cooling process of the mold. The combination of air cooling and water cooling allows the mold to have two different cooling modes during its cooling process, and can automatically switch between the two cooling modes according to the heat dissipation requirements, effectively improving the heat dissipation effect of the mold and making the cooling process gentle, thus avoiding mold cooling too fast or too slow, which affects the mold life and production efficiency.

[0033] It is worth noting that the two cooling methods in this embodiment are "air cooling" and "air cooling combined with water cooling". When the exhaust air temperature is not high, it means that the mold does not dissipate much heat at this time, and the air cooling method is sufficient to meet the heat dissipation requirements; when the exhaust air temperature is high, it means that the mold dissipates more heat at this time, and the air cooling will be combined with water cooling to dissipate the heat of the mold in time.

[0034] like Figure 2 As shown, the surface of the first water bag 42 is longitudinally provided with raised contact portions 421 at equal intervals, and a recessed ventilation portion 422 is formed between two adjacent raised contact portions 421 . The second water bag 62 has the same structural arrangement as the first water bag 42 .

[0035] Specifically, when cooling water is introduced into the first water bag 42, the raised contact portion 421 will gradually expand and bulge until it contacts the upper mold base 3 and the lower mold base 2, while the recessed ventilation portion 422 does not contact the mold at this time, so that cold air can still circulate in the recessed ventilation portion 422, thereby avoiding blockage of the circulation of cold air when the first water bag 42 bulges.

[0036] like Figure 3 , Figure 7 and Fig. 9As shown, the inner cavity of the first water bag 42 is connected with one end of the liquid inlet pipe 44, the liquid inlet pipe 44 passes through the first water bag 42 and extends into the frame, the inner cavity of the second water bag 62 is connected with the liquid outlet pipe 64, the liquid outlet pipe 64 passes through the first water bag 42 and extends into the frame, connecting interfaces 301 are provided at both ends of the upper mold base 3, the liquid inlet pipe 44 and the liquid outlet pipe 64 are respectively aligned with the corresponding connecting interfaces 301, and a cooling cavity 201 is provided on the inner wall of the lower mold base 2, and both ends of the cooling cavity 201 are connected with the corresponding connecting interfaces 301.

[0037] like Figure 8 As shown, a first connecting pipe 51 is provided on one side of the water tank 5 , and a second connecting pipe 71 is provided on one side of the cooler 7 . The first connecting pipe 51 is aligned and matched with the second connecting pipe 71 .

[0038] Specifically, when the first cover frame 4 and the second cover frame 6 are sealed and closed, the liquid inlet pipe 44 and the liquid outlet pipe 64 will be respectively adapted and connected to the corresponding connecting interface 301, and at the same time, the first connecting pipe 51 and the second connecting pipe 71 will be adapted and connected. At this time, the first water bag 42 and the second water bag 62 will be respectively connected to the cooling cavity 201 through the liquid inlet pipe 44 and the liquid outlet pipe 64, thereby forming a circulating water system between the water storage tank 5, the first water bag 42, the mold, the second water bag 62 and the cooler 7. During the water cooling process, the cooling water will flow from the water tank 5 into the first water bag 42, then enter the cooling cavity 201 through the liquid inlet pipe 44, and then enter the second water bag 62 from the liquid outlet pipe 64 after circulating in the cooling cavity 201, and then enter the cooler 7 through the water outlet pipe 72 for re-cooling. Finally, the cooling water will flow back to the water tank 5 through the first connecting pipe 51 and the second connecting pipe 71, thereby realizing the circulation process of the cooling water, and realizing the internal and external combined heat dissipation cooling process for the mold during the circulation, thereby improving the cooling effect of the mold.

[0039] like Figure 3 and Figure 4 As shown, the valve control structure includes a mercury column 46, a floating block 47, an electromagnetic block 53 and a valve core 54. The mercury column 46 is fixedly arranged in the first cover frame 4, the bottom end of the mercury column 46 extends into the air outlet pipe 43, and the top end of the mercury column 46 extends into the water inlet pipe 52. The floating block 47 is slidably installed in the mercury column 46 and floats up and down with the liquid level of mercury. The electromagnetic block 53 is fixedly arranged in the water inlet pipe 52, and the valve core 54 is located above the electromagnetic block 53 and is arranged at the connection between the water inlet pipe 52 and the first water bag 42.

[0040] Furthermore, a connecting rod 471 is fixedly provided at the top of the floating block 47, and an electrode column 472 is fixedly provided at the top of the connecting rod 471 which slides through the mercury column 46. Electrical contacts 531 are provided at both ends of the bottom of the electromagnetic block 53, and both ends of the electrode column 472 are aligned with the corresponding electrical contacts 531 respectively.

[0041] Specifically, by setting a valve control structure, during the cooling process, the air after heat exchange is continuously discharged from the air outlet pipe 43, and the temperature of the discharged air can be sensed and monitored in real time by using the mercury column 46. At the same time, by using the property of mercury expansion and contraction, when the temperature of the discharged air is high, the mercury in the mercury column 46 will expand due to the heat, and the floating block 47 will slide upward with the mercury, and drive the electrode column 472 to move upward through the connecting rod 471 until both ends of the electrode column 472 are in contact with the electrical contact 531. At this time, the electromagnetic block 53 is turned on. The electricity generates magnetism and applies suction to the valve core 54, so that the valve core 54 is constantly displaced to approach the electromagnetic block 53. The downward movement of the valve core 54 will open the passage between the water inlet pipe 52 and the first water bag 42, and the cooling water will begin to flow into the first water bag 42. When the exhaust air temperature is low, the mercury level is also low. At this time, the electrode column 472 is disconnected from the electrical contact 531, and the electromagnetic block 53 will also be powered off. The valve core 54 will not move downward to close the passage between the water inlet pipe 52 and the first water bag 42. Therefore, the valve control structure can realize the automatic opening and closing control of the cooling water passage according to the temperature of the exhaust air, and the temperature of the exhaust air reflects the heat dissipation of the mold, that is, different cooling methods can be automatically switched according to the heat dissipation requirements of the mold.

[0042] like Figure 5 As shown, a return spring 541 is arranged between the bottom of the valve core 54 and the top of the electromagnetic block 53, a positioning column 542 is fixedly arranged at the center of the bottom of the valve core 54, and a positioning groove 532 is arranged at the center of the upper end of the electromagnetic block 53. The positioning column 542 is adapted to be slidably installed in the positioning groove 532.

[0043] Specifically, the reset spring 541 can ensure that the valve core 54 can be quickly reset after the electromagnetic block 53 is powered off, and the sliding cooperation between the positioning column 542 and the positioning groove 532 can ensure the stability of the valve core 54 during the downward displacement process.

[0044] like Figure 2 and Figure 5 As shown, a sealing strip 41 is provided on the upper edge of the side wall of the first cover frame 4 close to the lower mold base 2 , and a sealing groove 61 is provided on the upper edge of the side wall of the second cover frame 6 close to the lower mold base 2 , and the sealing strip 41 is aligned and matched with the sealing groove 61 .

[0045] Specifically, when the first cover frame 4 and the second cover frame 6 are sealed and closed, the sealing strip 41 will also cooperate with the sealing groove 61, thereby improving the sealing performance of the first cover frame 4 and the second cover frame 6 when closed, and preventing cold air from overflowing from the closed gap.

[0046] The working principle of the present invention is as follows: Figure 1-Figure 9As shown, when the mold is cast, the first cover frame 4 and the second cover frame 6 slide linearly along the power-connected slide rail 101 and move away from each other, so that the upper mold base 3 and the lower mold base 2 are open and exposed to facilitate the casting operation. When the upper mold base 3 and the lower mold base 2 need to be cooled, the first cover frame 4 and the second cover frame 6 slide in the opposite direction along the power-connected slide rail 101 and move closer to each other until the first cover frame 4 and the second cover frame 6 are sealed and closed, thereby forming a closed cavity inside to cool the upper mold base 3 and the lower mold base 2. During cooling, the second fan 65 blows cold air into the closed cavity through the air inlet pipe 63. During the circulation process, the cold air continuously exchanges heat with the upper mold base 3 and the lower mold base 2 to absorb heat. At the same time, the first fan 45 continuously discharges the hot air after heat exchange through the air outlet pipe 43, thereby realizing the air cooling process of the mold. During the exhaust process of hot air, the mercury column 46 can be used to sense and monitor the temperature of the exhaust air in real time. At the same time, the mercury's thermal expansion and contraction characteristics are used. When the exhaust air temperature is high, the mercury in the mercury column 46 will expand due to the heat, and the floating block 47 will slide upward with the mercury, and drive the electrode column 472 to move upward through the connecting rod 471 until both ends of the electrode column 472 contact the electrical contact 531. At this time, the electromagnetic block 53 is energized to generate magnetism and exert suction on the valve core 54, so that the valve core 54 is continuously displaced to approach the electromagnetic The valve core 54 moves downwards to open the passage between the water inlet pipe 52 and the first water bag 42, and cooling water will begin to flow into the first water bag 42; when the exhaust air temperature is low, the mercury level is also low, and the electrode column 472 is disconnected from the electrical contact 531, and the electromagnetic block 53 is also powered off, and the valve core 54 will not move downwards to close the passage between the water inlet pipe 52 and the first water bag 42, so that the valve control structure can realize the automatic opening and closing control of the cooling water passage according to the exhaust air temperature. When the cooling water enters the first water bag 42 and the second water bag 62, the first water bag 42 and the second water bag 62 gradually swell and abut against the surface of the upper die seat 3 and the lower die seat 2, thereby realizing the water cooling process of the mold. The combination of air cooling and water cooling allows the mold to have two different cooling modes during its cooling process, and can automatically switch between the two cooling modes according to the heat dissipation requirements, effectively improving the heat dissipation effect of the mold and making the cooling process gentle, thus avoiding mold cooling too fast or too slow, which affects the mold life and production efficiency.

[0047] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A casting mold cooling device for low-pressure casting, comprising a base (1), a lower mold base (2) being arranged at the center of the upper end of the base (1), and an upper mold base (3) being arranged at the upper end of the lower mold base (2), characterized in that: The upper end of the base (1) is provided with a power-connecting slide rail (101) along a straight line, and the two ends of the lower mold base (2) are symmetrically provided with a first cover frame (4) and a second cover frame (6), the bottoms of the first cover frame (4) and the second cover frame (6) are both slidably mounted on the power-connecting slide rail (101), the first cover frame (4) and the second cover frame (6) are provided with openings on both sides, the first cover frame (4) and the second cover frame (6) are closed to each other to form a closed cavity and cover the lower mold base (2) and the upper mold base (3) inside the cavity; A first water bag (42) is fixedly arranged on the inner wall of the first cover frame (4), a first fan (45) is fixedly arranged on the side wall of the first cover frame (4), the first fan (45) is connected to one end of an air outlet pipe (43), the other end of the air outlet pipe (43) passes through the first water bag (42) and extends into the frame, a water storage tank (5) is fixedly arranged on the top of the first cover frame (4), one end of the water storage tank (5) is connected to a water inlet pipe (52), the water inlet pipe (52) is in communication with the first water bag (42), and a valve control structure for controlling water inflow is arranged inside the water inlet pipe (52); A second water bag (62) is fixedly arranged on the inner wall of the second cover frame (6), a second fan (65) is fixedly arranged on the side wall of the second cover frame (6), the second fan (65) is connected to one end of an air inlet pipe (63), the other end of the air inlet pipe (63) passes through the second water bag (62) and extends into the frame, a cooler (7) is fixedly arranged on the top end of the second cover frame (6), the cooler (7) is connected to one end of a water outlet pipe (72), the other end of the water outlet pipe (72) passes through the second cover frame (6) and is connected to the second water bag (62), and a water pump (73) is fixedly arranged on the water outlet pipe (72).

2. A low pressure casting mold cooling device according to claim 1, characterized in that: The surface of the first water bag (42) is longitudinally provided with raised contact portions (421) at equal intervals, and a recessed ventilation portion (422) is formed between two adjacent raised contact portions (421). The second water bag (62) has the same structural arrangement as the first water bag (42).

3. A low pressure casting mold cooling device according to claim 1, characterized in that: The inner cavity of the first water bag (42) is connected to one end of the liquid inlet pipe (44), the liquid inlet pipe (44) passes through the first water bag (42) and extends into the frame, the inner cavity of the second water bag (62) is connected to the liquid outlet pipe (64), the liquid outlet pipe (64) passes through the first water bag (42) and extends into the frame, the upper mold base (3) is provided with connecting interfaces (301) at both ends, the liquid inlet pipe (44) and the liquid outlet pipe (64) are respectively aligned with the corresponding connecting interfaces (301), and the inner wall of the lower mold base (2) is provided with a cooling cavity (201), and the two ends of the cooling cavity (201) are connected to the corresponding connecting interfaces (301).

4. A low pressure casting mold cooling device according to claim 3, characterized in that: One side of the water storage tank (5) is connected to a first connecting pipe (51), and one side of the cooler (7) is connected to a second connecting pipe (71), the first connecting pipe (51) and the second connecting pipe (71) being aligned and matched with each other.

5. The low pressure casting mold cooling device according to claim 1, characterized in that: The valve control structure comprises a mercury column (46), a floating block (47), an electromagnetic block (53) and a valve core (54); the mercury column (46) is fixedly arranged in the first cover frame (4); the bottom end of the mercury column (46) extends into the air outlet pipe (43); the top end of the mercury column (46) extends into the water inlet pipe (52); the floating block (47) is slidably installed in the mercury column (46) and floats up and down with the height of the mercury liquid level; the electromagnetic block (53) is fixedly arranged in the water inlet pipe (52); and the valve core (54) is located above the electromagnetic block (53) and is arranged at the connection between the water inlet pipe (52) and the first water bag (42).

6. A low pressure casting mold cooling device according to claim 5, characterized in that: A connecting rod (471) is fixedly provided at the top of the floating block (47), and an electrode column (472) is fixedly provided at the top of the connecting rod (471) which slides through the mercury column (46). Electrical contacts (531) are provided at both ends of the bottom of the electromagnetic block (53), and both ends of the electrode column (472) are respectively aligned with corresponding electrical contacts (531).

7. A low pressure casting mold cooling device according to claim 6, characterized in that: A return spring (541) is arranged between the bottom of the valve core (54) and the top of the electromagnetic block (53); a positioning column (542) is fixedly arranged at the center of the bottom of the valve core (54); a positioning groove (532) is arranged at the center of the upper end of the electromagnetic block (53); and the positioning column (542) is adapted to be slidably installed in the positioning groove (532).

8. The low pressure casting mold cooling device according to claim 1, characterized in that: A sealing strip (41) is provided on the upper edge of the side wall of the first cover frame (4) close to one end of the lower mold base (2), and a sealing groove (61) is provided on the upper edge of the side wall of the second cover frame (6) close to one end of the lower mold base (2), and the sealing strip (41) is aligned and matched with the sealing groove (61).

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