A casting mold cooling device for low-pressure casting

Abstract

The application 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 seat arranged at the upper end of the base, an upper mold seat arranged at the upper end of the lower mold seat, an electricity-connection sliding rail arranged at the upper end of the base in a straight line direction, a first cover frame and a second cover frame symmetrically arranged at the two ends of the lower mold seat, the first cover frame and the second cover frame being slidably installed on the electricity-connection sliding rail, the first cover frame and the second cover frame being arranged in a two-side opening mode, the first cover frame and the second cover frame being closed to each other to form a closed cavity and to enclose the lower mold seat and the upper mold seat in the cavity. The cooling process of the mold is combined with air cooling and water cooling, the cooling process has two different degrees of cooling modes, the two cooling modes can be automatically controlled and switched according to the heat dissipation demand, the mold heat dissipation effect is effectively improved, the cooling process is moderate, and the mold service life and production efficiency are not affected due to the mold cooling being too fast or too slow.

Description

Technical Field

[0001] This invention relates to the field of metal casting mold cooling technology, and more particularly to a casting mold cooling device for low-pressure casting. Background Technology

[0002] Low-pressure casting is a method of forming a casting by filling a mold cavity with molten metal under gas pressure in the direction of anti-gravity. It is characterized by smooth filling and dense solidification. Because the gas pressure used is relatively low, it is called low-pressure casting. The process is as follows: Dry compressed air is introduced into a sealed crucible (or sealed container). Under the pressure of the gas, the molten metal rises along the riser pipe and smoothly enters the mold cavity through the gate. After filling, the gas pressure on the surface of the liquid in the crucible is maintained until the casting is completely solidified. Then, the gas pressure on the surface of the liquid is released, allowing the unsolidified molten metal in the pipe to flow into the crucible. Finally, a cylinder opens the mold and ejects the casting.

[0003] Currently, in low-pressure casting processes, cooling devices are generally used to cool the mold in order to improve casting efficiency. Existing cooling devices often cool the mold by directly contacting it with cold air or liquid nitrogen. Cold air cooling is relatively slow and can easily affect production efficiency, while liquid nitrogen has a strong cooling intensity, and excessively fast cooling can cause the mold to become brittle and prone to cracking. Summary of the Invention

[0004] The purpose of this invention is to provide a cooling device for casting molds used in low-pressure casting, thereby solving the aforementioned technical problems.

[0005] The objective of this invention can be achieved through the following technical solutions: A cooling device for a casting mold used in low-pressure casting includes a base, a lower mold base is disposed at the center of the upper end of the base, an upper mold base is disposed at the upper end of the lower mold base, an electrical sliding rail is disposed at the upper end of the base along a straight direction, a first cover frame and a second cover frame are symmetrically disposed at both ends of the lower mold base, the bottom of the first cover frame and the second cover frame are slidably mounted on the electrical sliding rail, the first cover frame and the second cover frame are open on both sides, the first cover frame and the second cover frame approach each other and close to form a closed cavity and enclose the lower mold base and the upper mold base inside the cavity.

[0006] A first water bladder is fixedly installed on the inner wall of the first cover frame, and a first fan is fixedly installed on the side wall of the first cover frame. The first fan is connected to one end of the air outlet pipe, and the other end of the air outlet pipe passes through the first water bladder and extends into the frame. A water storage tank is fixedly installed at the top of the first cover frame, and one end of the water storage tank is connected to a water inlet pipe. The water inlet pipe is connected to the first water bladder, and a valve control structure for controlling whether water enters is provided inside the water inlet pipe.

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

[0008] As a further aspect of the present invention: the surface of the first water bladder is provided with raised contact portions at equal intervals in the longitudinal direction, and a recessed ventilation portion is formed between two adjacent raised contact portions; the second water bladder has the same structural arrangement as the first water bladder.

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

[0010] As a further aspect of the present invention: a first connecting pipe is connected to one side of the water storage tank, and a second connecting pipe is connected to one side of the cooler, wherein the first connecting pipe and the second connecting pipe are aligned and adapted to each other.

[0011] As a further embodiment 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 installed inside the first cover frame, with its bottom end extending into the air outlet pipe and its top end extending into the water inlet pipe. The floating block is slidably installed inside the mercury column and floats up and down with the mercury level. The electromagnetic block is fixedly installed inside the water inlet pipe, and the valve core is located above the electromagnetic block and at the connection between the water inlet pipe and the first water bladder.

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

[0013] As a further embodiment of the present invention: a reset spring is provided between the bottom of the valve core and the top of the solenoid block, a positioning post is fixedly provided at the center of the bottom of the valve core, a positioning groove is provided at the center of the upper end of the solenoid block, and the positioning post is adapted to slide and install in the positioning groove.

[0014] As a further aspect of the present invention: a sealing strip is provided on the upper edge of the side wall of the first cover frame near the lower mold base, and a sealing groove is provided on the upper edge of the side wall of the second cover frame near the lower mold base, wherein the sealing strip and the sealing groove are aligned and adapted to each other.

[0015] The beneficial effects of this invention are as follows: When the first and second covers are closed to cool the mold, the second fan blows cold air into the closed cavity through the air inlet pipe. During the flow, the cold air continuously exchanges heat with the upper and lower mold bases to absorb heat. Simultaneously, the first fan continuously discharges the heated air through the air outlet pipe, thus achieving the air cooling process for the mold. During the discharge of hot air, the valve control structure can control the opening and closing of the water inlet pipe and the first water bladder according to the temperature of the discharged air. At the same time, a circulating water system is formed between the water tank, the first water bladder, the mold, the second water bladder, and the cooler. When the mold needs further heat dissipation, cooling water enters the first and second water bladders, causing them to gradually inflate and press against the surfaces of the upper and lower mold bases, thereby achieving the water cooling process for the mold. The combination of air cooling and water cooling allows the mold to have two different cooling methods, and can automatically switch between the two cooling methods according to the heat dissipation requirements. This effectively improves the heat dissipation effect and production efficiency of the mold, and makes the cooling process gentle, avoiding the impact on mold life and production efficiency caused by excessively fast or slow cooling. Attached Figure Description

[0016] The invention will now be further described with reference to the accompanying drawings.

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

[0018] Figure 2 This is a schematic diagram of the structure of the first cover frame in this invention.

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

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

[0021] Figure 5 This is a schematic diagram of the structure of the electromagnetic block and valve core in this invention.

[0022] Figure 6 This is a schematic diagram of the structure of the second cover frame in this invention.

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

[0024] Figure 8This is a schematic diagram of the closure of the first cover frame and the second cover frame in this invention.

[0025] Figure 9 This is a schematic diagram of the internal structure in the closed state of this invention.

[0026] In the diagram: 1. Base; 101. Electrically connected slide rail; 2. Lower mold base; 201. Cooling cavity; 3. Upper mold base; 301. Connecting interface; 4. First cover frame; 41. Sealing strip; 42. First water bladder; 421. Protruding 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; 54. Valve core; 541. Return spring; 542. Positioning column; 6. Second cover frame; 61. Sealing groove; 62. Second water bladder; 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 Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figure 1 , Figure 8 and Figure 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 provided at the center of the upper end of the base 1, an upper mold base 3 is provided at the upper end of the lower mold base 2, an electric sliding rail 101 is provided at the upper end of the base 1 along a straight direction, a first cover frame 4 and a second cover frame 6 are symmetrically provided at both ends of the lower mold base 2, the bottom of the first cover frame 4 and the second cover frame 6 are slidably installed on the electric sliding rail 101, the first cover frame 4 and the second cover frame 6 are open on both sides, the first cover frame 4 and the second cover frame 6 are close to each other and close to form a closed cavity, which covers the lower mold base 2 and the upper mold base 3 inside the cavity.

[0029] Specifically, during mold casting, 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 exposed to facilitate casting operations. When it is necessary to cool the upper mold base 3 and the lower mold base 2, the first cover frame 4 and the second cover frame 6 slide in opposite directions 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.

[0030] like Figure 2 and Figure 3 As shown, a first water bladder 42 is fixedly installed on the inner wall of the first cover frame 4, and a first fan 45 is fixedly installed on the side wall of the first cover frame 4. The first fan 45 is connected to one end of the air outlet pipe 43, and the other end of the air outlet pipe 43 passes through the first water bladder 42 and extends into the frame. A water storage tank 5 is fixedly installed at the top of the first cover frame 4. One end of the water storage tank 5 is connected to a water inlet pipe 52, which is connected to the first water bladder 42. A valve control structure for controlling whether water enters is provided inside the water inlet pipe 52.

[0031] like Figure 6 and Figure 7 As shown, a second water bladder 62 is fixedly installed on the inner wall of the second cover frame 6, and a second fan 65 is fixedly installed on the side wall of the second cover frame 6. The second fan 65 is connected to one end of the air inlet pipe 63, and the other end of the air inlet pipe 63 passes through the second water bladder 62 and extends into the frame. A cooler 7 is fixedly installed at the top of the second cover frame 6. The cooler 7 is connected to one end of the water outlet pipe 72, and the other end of the water outlet pipe 72 passes through the second cover frame 6 and is connected to the second water bladder 62. A water pump 73 is fixedly installed 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. 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 heated air through the air outlet pipe 43, thereby realizing the air cooling process of the mold. During the discharge process, the valve control structure can control the opening and closing state of the water inlet pipe 52 and the first water bladder 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 bladder 42, the mold, the second water bladder 62, and the cooler 7. When the mold needs further heat dissipation, cooling water enters the first water bladder 42 and the second water bladder 62, causing the first water bladder 42 and the second water bladder 62 to gradually inflate and press against the surfaces 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 methods, and can automatically switch between the two cooling methods according to the heat dissipation requirements, effectively improving the heat dissipation of the mold and making the cooling process gentle, avoiding the impact on mold life and production efficiency caused by the mold cooling too fast or too slow.

[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 is not dissipating much heat, and air cooling is sufficient to meet the heat dissipation requirements; when the exhaust air temperature is high, it means that the mold is dissipating more heat, and air cooling will be combined with water cooling to dissipate heat and cool the mold in a timely manner.

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

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

[0036] like Figure 3 , Figure 7 and Figure 9As shown, the inner cavity of the first water bladder 42 is connected to one end of the liquid inlet pipe 44. The liquid inlet pipe 44 passes through the first water bladder 42 and extends into the frame. The inner cavity of the second water bladder 62 is connected to the liquid outlet pipe 64. The liquid outlet pipe 64 passes through the first water bladder 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 and adapted with the corresponding connecting interfaces 301. The lower mold base 2 is provided with a cooling channel 201 on its inner wall. The two ends of the cooling channel 201 are connected to the corresponding connecting interfaces 301.

[0037] like Figure 8 As shown, a first connecting pipe 51 is connected to one side of the water storage tank 5, and a second connecting pipe 71 is connected to one side of the cooler 7. The first connecting pipe 51 and the second connecting pipe 71 are aligned and adapted to each other.

[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 adapted and connected to the corresponding connecting interface 301 respectively. 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 bladder 42 and the second water bladder 62 will be connected to the cooling cavity 201 through the liquid inlet pipe 44 and the liquid outlet pipe 64 respectively, thereby forming a circulating water system between the water storage tank 5, the first water bladder 42, the mold, the second water bladder 62 and the cooler 7. During the water cooling process, cooling water is introduced from the water storage tank 5 into the first water bladder 42, then enters the cooling chamber 201 through the liquid inlet pipe 44, flows through the cooling chamber 201, and then enters the second water bladder 62 through the liquid outlet pipe 64. It then enters the cooler 7 through the water outlet pipe 72 for re-cooling. Finally, the cooling water flows back to the water storage tank 5 through the first connecting pipe 51 and the second connecting pipe 71, thus realizing the circulation process of cooling water. In addition, the circulation process achieves a combined internal and external heat dissipation and cooling process for the mold, 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 installed inside 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 inside the mercury column 46 and floats up and down with the height of the mercury liquid level. The electromagnetic block 53 is fixedly installed inside the water inlet pipe 52. The valve core 54 is located above the electromagnetic block 53 and is located at the connection between the water inlet pipe 52 and the first water bladder 42.

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

[0041] Specifically, by setting a valve-controlled structure, during the cooling process, the air after heat exchange is continuously discharged from the air outlet duct 43. The mercury column 46 can sense and monitor the temperature of the discharged air in real time. At the same time, taking advantage of the thermal expansion and contraction properties of mercury, when the temperature of the discharged air is high, the mercury in the mercury column 46 will expand due to heat, and the floating block 47 will slide upward with the mercury. It will also drive the electrode column 472 to move upward through the connecting rod 471 until the two ends of the electrode column 472 contact the electrical contact 531. At this time, the electromagnetic block 53 is energized. The electricity generates magnetism and applies an attractive force to the valve core 54, causing it to continuously move closer to the solenoid block 53. The downward movement of the valve core 54 opens the passage between the water inlet pipe 52 and the first water bladder 42, allowing cooling water to flow into the first water bladder 42. When the exhaust air temperature is low, the mercury level is also low. At this time, the electrode post 472 disconnects from the contact 531, the solenoid block 53 is de-energized, and the valve core 54 will not move downward, thus closing the passage between the water inlet pipe 52 and the first water bladder 42. Therefore, the valve-controlled structure can automatically control the opening and closing of the cooling water passage based on the temperature of the exhaust air. The temperature of the exhaust air reflects the heat dissipation of the mold, meaning that different cooling methods can be automatically switched according to the mold's heat dissipation requirements.

[0042] like Figure 5 As shown, a reset spring 541 is provided between the bottom of the valve core 54 and the top of the solenoid block 53. A positioning post 542 is fixedly provided in the center of the bottom of the valve core 54. A positioning groove 532 is provided in the center of the upper end of the solenoid block 53. The positioning post 542 is adapted to slide and install in the positioning groove 532.

[0043] Specifically, the return spring 541 ensures that the valve core 54 can quickly return to its original position after the solenoid block 53 is de-energized, and the sliding cooperation between the positioning pin 542 and the positioning groove 532 ensures the stability of the valve core 54 during downward displacement.

[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 near 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 near the lower mold base 2. The sealing strip 41 and the sealing groove 61 are aligned and matched.

[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 escaping from the closing gap.

[0046] The working principle of this invention is as follows: Figures 1-9As shown, during mold casting, the first cover frame 4 and the second cover frame 6 slide linearly along the power-connected slide rail 101, moving away from each other, thus exposing the upper mold base 3 and the lower mold base 2 for convenient casting operations. When cooling of the upper mold base 3 and the lower mold base 2 is required, the first cover frame 4 and the second cover frame 6 slide in opposite directions along the power-connected slide rail 101, moving closer to each other until the first cover frame 4 and the second cover frame 6 seal shut, thereby forming a closed cavity inside for cooling 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. 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 heated air through the air outlet pipe 43, thereby achieving the air cooling process for the mold. During the exhaust process, the mercury column 46 can sense and monitor the temperature of the exhaust air in real time. Utilizing the thermal expansion and contraction property of mercury, when the exhaust air temperature is high, the mercury inside the mercury column 46 will expand due to heat. The floating block 47 will slide upwards with the mercury, and through the connecting rod 471, it will drive the electrode column 472 upwards until both ends of the electrode column 472 contact the electrical contact 531. At this point, the electromagnetic block 53 is energized, generating magnetism and applying an attractive force to the valve core 54, causing the valve core 54 to continuously shift closer to the electromagnetic block. The downward movement of block 53 and valve core 54 opens the passage between the water inlet pipe 52 and the first water bladder 42, allowing cooling water to flow into the first water bladder 42. When the exhaust air temperature is low, the mercury level is also low, causing electrode post 472 to disconnect from contact 531 and de-energizing block 53. Valve core 54 will not move downward, thus closing the passage between the water inlet pipe 52 and the first water bladder 42. This valve-controlled structure allows for automatic opening and closing of the cooling water passage based on the exhaust air temperature. When cooling water enters the first water bladder 42 and the second water bladder 62, they gradually inflate and press against the surfaces of the upper mold base 3 and the lower mold base 2, achieving water cooling of the mold. The combination of air cooling and water cooling allows the mold to have two different cooling methods, and can automatically switch between the two cooling methods according to the heat dissipation requirements, effectively improving the heat dissipation of the mold and making the cooling process gentle, avoiding the impact on mold life and production efficiency caused by the mold cooling too fast or too slow.

[0047] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A casting mold cooling device for low-pressure casting, comprising a base (1), wherein a lower mold base (2) is disposed at the center of the upper end of the base (1), and an upper mold base (3) is disposed at the upper end of the lower mold base (2), characterized in that, The upper end of the base (1) is provided with an electric sliding rail (101) along a straight direction. The lower mold base (2) is symmetrically provided with a first cover frame (4) and a second cover frame (6) at both ends. The bottom of the first cover frame (4) and the second cover frame (6) are slidably installed on the electric sliding rail (101). The first cover frame (4) and the second cover frame (6) are open on both sides. The first cover frame (4) and the second cover frame (6) are close 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 bladder (42) is fixedly installed on the inner wall of the first cover frame (4), and a first fan (45) is fixedly installed on the side wall of the first cover frame (4). The first fan (45) is connected to one end of the air outlet pipe (43), and the other end of the air outlet pipe (43) passes through the first water bladder (42) and extends into the frame. A water storage tank (5) is fixedly installed at the top of the first cover frame (4). One end of the water storage tank (5) is connected to a water inlet pipe (52), and the water inlet pipe (52) is connected to the first water bladder (42). A valve control structure for controlling whether water enters is provided inside the water inlet pipe (52). A second water bladder (62) is fixedly installed on the inner wall of the second cover frame (6), and a second fan (65) is fixedly installed on the side wall of the second cover frame (6). The second fan (65) is connected to one end of the air inlet pipe (63), and the other end of the air inlet pipe (63) passes through the second water bladder (62) and extends into the frame. A cooler (7) is fixedly installed at the top of the second cover frame (6). The cooler (7) is connected to one end of the water outlet pipe (72), and the other end of the water outlet pipe (72) passes through the second cover frame (6) and is connected to the second water bladder (62). A water pump (73) is fixedly installed on the water outlet pipe (72). The surface of the first water bladder (42) is provided with raised contact portions (421) at equal intervals in the longitudinal direction, and a recessed ventilation portion (422) is formed between two adjacent raised contact portions (421). The second water bladder (62) has the same structural arrangement as the first water bladder (42). When cooling water is introduced into the first water bladder (42), the protruding contact part (421) will gradually expand and bulge until it contacts the upper mold base (3) and the lower mold base (2). At this time, the recessed ventilation part (422) does not contact the mold, so that the cold air can still circulate in the recessed ventilation part (422), thereby avoiding the blockage of the cold air circulation when the first water bladder (42) bulges. The inner cavity of the first water bladder (42) is connected to one end of the liquid inlet pipe (44). The liquid inlet pipe (44) passes through the first water bladder (42) and extends into the frame. The inner cavity of the second water bladder (62) is connected to the liquid outlet pipe (64). The liquid outlet pipe (64) passes through the second water bladder (62) and extends into the frame. The upper mold base (3) is provided with a communication interface (301) at both ends. The liquid inlet pipe (44) and the liquid outlet pipe (64) are respectively aligned and adapted with the corresponding communication interface (301). The lower mold base (2) is provided with a cooling channel (201) on its inner wall. The two ends of the cooling channel (201) are connected to the corresponding communication interface (301). The water storage tank (5) is connected to a first connecting pipe (51) on one side, and the cooler (7) is connected to a second connecting pipe (71) on one side. The first connecting pipe (51) and the second connecting pipe (71) are aligned and matched.

2. The casting mold cooling device for low-pressure casting according to claim 1, characterized in that, 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 installed inside 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 inside the mercury column (46) and floats up and down with the height of the mercury liquid level. The electromagnetic block (53) is fixedly installed inside the water inlet pipe (52). The valve core (54) is located above the electromagnetic block (53) and is located at the connection between the water inlet pipe (52) and the first water bag (42).

3. The casting mold cooling device for low-pressure casting according to claim 2, characterized in that, The top of the floating block (47) is fixedly provided with a connecting rod (471), the top of the connecting rod (471) slides through the mercury column (46) and is fixedly provided with an electrode column (472), the bottom of the electromagnetic block (53) is provided with electrical contacts (531), and the two ends of the electrode column (472) are respectively aligned with the corresponding electrical contacts (531).

4. A casting mold cooling device for low-pressure casting according to claim 3, characterized in that, A reset spring (541) is provided between the bottom of the valve core (54) and the top of the electromagnetic block (53). A positioning post (542) is fixedly provided at the center of the bottom of the valve core (54). A positioning groove (532) is provided at the center of the upper end of the electromagnetic block (53). The positioning post (542) is adapted to slide and install in the positioning groove (532).

5. A casting mold cooling device for low-pressure casting according to claim 4, characterized in that, A sealing strip (41) is provided on the side wall of the first cover frame (4) near the lower mold base (2), and a sealing groove (61) is provided on the side wall of the second cover frame (6) near the lower mold base (2). The sealing strip (41) and the sealing groove (61) are aligned and matched.

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