Silica sol precision casting sequential solidification cooling device and cooling method

Abstract

The invention provides a sequential solidification cooling device and method for silica sol precision casting, and belongs to the technical field of silica sol precision casting, and the sequential solidification cooling device for silica sol precision casting comprises a cooling base, an electromagnetic valve, a controller, a first temperature sensor and a second temperature sensor. The first temperature sensor and the second temperature sensor are respectively arranged at the liquid inlet and the liquid outlet of the liquid cooling cavity on the cooling base and are used for monitoring the liquid inlet temperature and the liquid outlet temperature of the liquid cooling cavity. When the temperature difference between the temperature of the liquid inlet and the temperature of the liquid outlet is large, the controller can control the electromagnetic valve to increase the opening degree so as to increase the flow in the liquid cooling cavity, and therefore the temperature difference between the two ends of the cooling base in the first direction is guaranteed. And meanwhile, the cooling liquid which continuously circulates in the liquid cooling cavity can keep continuous heat exchange with the mold shells, so that it is guaranteed that the multiple mold shells can obtain the stable heat dissipation effect, and the stability of the casting forming quality is improved.

Description

Technical Field

[0001] This invention belongs to the field of silica sol precision casting technology, specifically relating to a silica sol precision casting sequential solidification and cooling device and cooling method. Background Technology

[0002] Due to structural limitations, some silica sol precision castings cannot use gates for feeding in thicker areas. After pouring, these areas must be forced to solidify first to achieve the feeding effect. To improve the forming quality of these thicker sections and accelerate cooling, the current method typically involves placing the corresponding mold shell on wet sand. However, the mold shell temperature is high after pouring. During cooling, water evaporation carries away heat, and some water vapor enters the mold shell through its pores, forming air pockets on the casting surface and affecting surface quality. While liquid cooling plates are used, heat exchange occurs between the circulating coolant and the mold shell. The coolant absorbs heat during flow, causing its temperature to gradually rise, resulting in a significant temperature difference on the cooling plate. Currently, effective temperature control of the coolant is impossible, leading to uneven cooling across the mold shell and affecting the stability of the casting quality. Summary of the Invention

[0003] This invention provides a silica sol precision casting sequential solidification cooling device and cooling method, which aims to solve the problem of unstable casting quality in the prior art during the sequential solidification process of silica sol precision casting.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a silica sol precision casting sequential solidification and cooling device, comprising: A cooling base, the top surface of which is used to place the shell, and the interior of the cooling base is provided with a liquid cooling cavity for the flow of coolant. The length direction of the cooling base is defined as the first direction, and the two ends of the cooling base along the first direction are respectively provided with an inlet pipe and an outlet pipe communicating with the liquid cooling cavity. A solenoid valve, connected to the inlet pipe, is used to control the flow rate inside the inlet pipe; A controller, electrically connected to the solenoid valve, is used to control the opening degree of the solenoid valve; A first temperature sensor is installed at the liquid inlet of the liquid cooling cavity to monitor the liquid inlet temperature of the liquid cooling cavity. The second temperature sensor is installed at the liquid outlet of the liquid cooling chamber to monitor the liquid outlet temperature of the liquid cooling chamber. Both the first temperature sensor and the second temperature sensor are electrically connected to the controller.

[0005] In one possible implementation, the liquid cooling cavity includes a plurality of flow channels that are connected end to end in sequence, and the length direction of the flow channels is arranged along a first direction, and the plurality of flow channels are arranged in sequence along the width direction of the cooling base.

[0006] In one possible implementation, the cooling base is inclined vertically in a first direction, and the height of the liquid outlet pipe on the cooling base is higher than the height of the liquid inlet pipe.

[0007] In one possible implementation, the inlet pipe on the cooling base is also connected to a liquid cooling mechanism for supplying coolant into the liquid cooling chamber, and the working end of the liquid cooling mechanism is electrically connected to the controller.

[0008] The solution shown in this application, compared with the prior art, incorporates a cooling base. The top surface of the cooling base is used to place the mold shell, and a liquid cooling cavity is provided inside the cooling base. After the mold shell is cast, it is placed on the cooling base, causing the thicker part of the casting to adhere to the top of the cooling base. This enables heat exchange between the coolant inside the liquid cooling cavity and the mold shell, absorbing the heat from the mold shell and rapidly cooling the thicker part inside. Furthermore, during production, multiple mold shells need to be placed on the same cooling base. To ensure uniform heat dissipation at the bottom of the mold shells, the coolant inside the liquid cooling cavity needs to be kept within a certain temperature range. Therefore, this application provides a first temperature sensor and a second temperature sensor at the inlet and outlet of the liquid cooling cavity on the cooling base. These sensors monitor the inlet and outlet temperatures of the liquid cooling cavity. When the temperature difference between the inlet and outlet is large, a controller can be used to increase the opening of the solenoid valve to increase the flow rate inside the liquid cooling cavity. This ensures a temperature difference between the two ends of the cooling base along the first direction, while the continuously flowing coolant inside the liquid cooling chamber maintains continuous heat exchange with the mold shell. This guarantees stable heat dissipation for all mold shells, improving the stability of the casting quality.

[0009] In conjunction with the first aspect, this application also provides a method for sequential solidification and cooling of silica sol in precision casting, employing the aforementioned sequential solidification and cooling apparatus for silica sol in precision casting, comprising the following steps: S1, through the controller, the solenoid valve is opened to allow the coolant to flow through the liquid cooling chamber. After coolant flows out of the outlet of the liquid cooling chamber, the inlet and outlet temperatures of the liquid cooling chamber are monitored by the first temperature sensor and the second temperature sensor. S2, place the cast shells sequentially onto the top surface of the cooling base, and make the thicker side of the casting on the shell abut against the cooling base; S3, define the stable range of temperature difference between the liquid outlet and the liquid inlet of the liquid cooling chamber as the first range value, and monitor the temperature difference between the liquid inlet and the liquid outlet of the liquid cooling chamber; S4. When the temperature difference between the liquid outlet and the liquid inlet of the liquid cooling chamber exceeds the first range value, the controller increases the opening of the solenoid valve until the temperature difference is within the first range value.

[0010] In one possible implementation, the opening degree of the solenoid valve in step 1 is defined as the initial opening degree. In step 4, when the temperature difference between the liquid outlet and the liquid inlet of the liquid cooling chamber is lower than the first range value, the opening degree of the solenoid valve is reduced by the controller until the opening degree of the solenoid valve is restored to the initial opening degree.

[0011] In one possible implementation, step 4 further includes monitoring multiple temperature values ​​at the liquid outlet of the liquid cooling chamber within a certain time period, analyzing the temperature change trend at the liquid outlet of the liquid cooling chamber, and stopping the reduction of the opening of the solenoid valve when the temperature difference between the inlet and outlet exceeds the first range value and the temperature change trend is downward, and maintaining the existing opening.

[0012] In one possible implementation, the acceptable temperature range of the liquid cooling chamber inlet is defined as a second range value. The temperature value of the liquid cooling chamber inlet is monitored. When the temperature value exceeds the second range value, the liquid cooling mechanism is controlled by the controller to increase the cooling effect. If the temperature value is lower than the second range value, the cooling effect of the liquid cooling mechanism is reduced by the controller.

[0013] In one possible implementation, when the temperature difference between the liquid outlet and the liquid inlet of the liquid cooling chamber is higher than a first range value and the temperature value of the liquid inlet of the liquid cooling chamber is lower than a second range value, the operating power of the liquid cooling mechanism remains unchanged.

[0014] In one possible implementation, when the temperature difference between the liquid outlet and the liquid inlet of the liquid cooling chamber is lower than the first range value, the cooling effect of the liquid cooling mechanism is reduced first and the temperature of the liquid inlet of the liquid cooling chamber is stabilized so that it does not exceed the highest value of the second range value. Then, the opening of the solenoid valve is adjusted so that the temperature difference between the liquid inlet and the liquid outlet of the liquid cooling chamber is within the first range value.

[0015] The solution described in this application, compared with the prior art, initially delivers coolant to the liquid cooling cavity via a liquid cooling mechanism, facilitating heat exchange between the coolant and the mold shell. This application uses a first temperature sensor and a second temperature sensor to monitor the temperature at the inlet and outlet of the liquid cooling cavity on the cooling base. Based on the monitored temperature difference between the inlet and outlet, the opening of the solenoid valve is controlled. When the temperature difference is large, the opening of the solenoid valve is increased, thereby increasing the flow rate inside the liquid cooling cavity and ensuring the uniformity of the coolant temperature within the cavity. This allows multiple mold shells placed on the cooling base to exchange heat synchronously. Furthermore, a stable temperature is maintained within the corresponding range of the same mold shell, preventing large temperature differences that could lead to uneven heat exchange inside the mold shell and affect casting quality. This application can control the overall temperature of the liquid inside the liquid cooling cavity by monitoring the temperature difference within the cavity, ensuring uniform heat exchange for multiple mold shells and improving the subsequent casting quality. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the process of a sequential solidification and cooling device for silica sol precision casting provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of the cooling base provided in an embodiment of the present invention; Figure 3 This is a schematic flowchart of the sequential solidification and cooling method for silica sol precision casting provided in an embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. Cooling base; 11. Liquid cooling chamber; 12. Liquid inlet pipe; 13. Liquid outlet pipe; 2. Solenoid valve; 3. First temperature sensor; 4. Second temperature sensor; 5. Liquid cooling mechanism; 51. Cooling tower; 52. Water storage tank. Detailed Implementation

[0018] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0019] Please refer to the following: Figures 1 to 2The sequential solidification and cooling device for silica sol precision casting provided by the present invention will now be described. The sequential solidification and cooling device for silica sol precision casting includes a cooling base 1, a controller, a solenoid valve 2 installed on the liquid inlet pipe 12 on the cooling base 1, and a first temperature sensor 3 and a second temperature sensor 4 respectively installed at the liquid inlet and liquid outlet of the liquid cooling chamber 11. The top surface of the cooling base 1 is used to place the shell. The cooling base 1 is provided with a liquid cooling cavity 11 for the flow of coolant. The length direction of the cooling base 1 is defined as the first direction. The two ends of the cooling base 1 along the first direction are respectively provided with an inlet pipe 12 and an outlet pipe 13 communicating with the liquid cooling cavity 11. A solenoid valve 2 is connected to the inlet pipe 12 and is used to control the flow rate inside the inlet pipe 12. A controller is electrically connected to the solenoid valve 2 and is used to control the opening degree of the solenoid valve 2. A first temperature sensor 3 is installed at the inlet of the liquid cooling cavity 11 and is used to monitor the inlet temperature of the liquid cooling cavity 11. A second temperature sensor 4 is installed at the outlet of the liquid cooling cavity 11 and is used to monitor the outlet temperature of the liquid cooling cavity 11. Both the first temperature sensor 3 and the second temperature sensor 4 are electrically connected to the controller.

[0020] The silica sol precision casting sequential solidification cooling device provided in this embodiment, compared with the prior art, initially delivers coolant to the liquid cooling cavity 11 through the liquid cooling mechanism 5, and heat exchange occurs between the coolant and the mold shell. This application uses a first temperature sensor 3 and a second temperature sensor 4 to monitor the temperature of the inlet and outlet of the liquid cooling cavity 11 on the cooling base 1. Based on the monitored temperature difference between the inlet and outlet, the opening of the solenoid valve 2 is controlled. When the temperature difference is large, the opening of the solenoid valve 2 is increased, thereby increasing the flow rate inside the liquid cooling cavity 11, ensuring the uniformity of the coolant temperature inside the liquid cooling cavity 11, and enabling multiple mold shells placed on the cooling base 1 to exchange heat synchronously. Furthermore, a stable temperature is maintained within the corresponding range of the same mold shell, avoiding large temperature differences that could lead to uneven heat exchange inside the mold shell and affect the casting quality. This application can adjust the opening of the solenoid valve 2 by monitoring the internal temperature difference of the liquid cooling cavity 11, thereby controlling the overall temperature of the liquid inside the liquid cooling cavity 11, ensuring uniform heat exchange for multiple mold shells, and thus improving the forming quality of the castings in the later stage.

[0021] Specifically, in this embodiment, when placing the mold shells on the cooling base 1, multiple mold shells are arranged sequentially along the first direction. The flow rate of the liquid inside the liquid cooling cavity 11 is indirectly controlled by controlling the opening degree of the solenoid valve 2, thereby ensuring that the temperature difference inside the liquid cooling cavity 11 is within a stable range. This ensures that multiple mold shells can exchange heat uniformly and synchronously, improving the molding quality of the internal castings. This allows multiple mold shells to be cooled simultaneously on the same cooling base 1.

[0022] Preferably, in this embodiment, before placing the mold shell, a layer of steel sand is laid on the top surface of the cooling base 1. This can improve the stability of the mold shell during placement and increase the contact area between the steel sand and the mold shell, thereby improving the heat exchange effect.

[0023] In some embodiments, the cooling base 1 may be as follows: Figure 2 The structure shown. See also Figure 2 The liquid cooling cavity 11 includes multiple flow channels that are connected end-to-end, with the length direction of the flow channels arranged along a first direction and the multiple flow channels arranged sequentially along the width direction of the cooling base 1. Multiple baffles are fixedly installed inside the liquid cooling cavity 11, with the length direction arranged along the first direction and the baffles arranged at intervals along the width direction of the cooling base 1. The multiple baffles form multiple adjacent flow channels, and adjacent flow channels are interconnected end-to-end. The liquid inlet pipe 12 on the cooling base 1 is connected to a flow channel on one side, and the liquid outlet pipe 13 on the cooling base 1 is connected to a flow channel on the other side, thereby allowing the coolant to circulate reciprocally within the liquid cooling cavity 11 along the first direction. During circulation, the coolant can absorb heat by passing through multiple shells sequentially and then circulate back and forth through multiple shells to absorb heat again, thus ensuring effective cooling of the rear shells. Furthermore, by controlling the opening of the solenoid valve 2 to control the temperature of the liquid inside the entire liquid cooling cavity 11, it is possible to effectively ensure synchronous heat dissipation from multiple shells.

[0024] Specifically, in this embodiment, multiple shell thicknesses can be cooled simultaneously during mass production, and synchronous cooling can be ensured so that multiple shells can solidify at the same time, which not only ensures molding quality but also improves production efficiency.

[0025] In some embodiments, the cooling base 1 may adopt the following... Figure 2 The structure shown. See also Figure 2 The cooling base 1 is inclined vertically in a first direction, and the height of the outlet pipe 13 on the cooling base 1 is higher than the height of the inlet pipe 12. The cooling base 1 is inclined in the first direction, and the liquid cooling cavity 11 inside the cooling base 1 is also inclined in the first direction, with the height of the inlet pipe 12 lower than the height of the outlet pipe 13. When coolant is pumped into the liquid cooling cavity 11, the coolant enters through the inlet pipe 12 and exits through the outlet pipe 13. Because the height of the outlet pipe 13 is higher than the height of the inlet pipe 12, the coolant can effectively fill the liquid cooling cavity 11. Even if air bubbles are generated inside the liquid cooling cavity 11, the bubbles can be quickly discharged with the coolant. Because the liquid cooling cavity 11 is inclined, the bubbles will automatically move to one end of the cooling base 1, thus avoiding the residue of bubbles in the middle of the cooling base 1. This allows the coolant to effectively contact the top surface of the cooling base 1, improving the uniformity of heat dissipation.

[0026] In some embodiments, the liquid cooling mechanism 5 described above may employ, for example... Figure 2 The structure shown. See also Figure 2 The inlet pipe 12 on the cooling base 1 is also connected to a liquid cooling mechanism 5 for supplying coolant to the liquid cooling chamber 11. The working end of the liquid cooling mechanism 5 is electrically connected to the controller. The liquid cooling mechanism 5 includes a cooler, which can be a cooling tower 51. The controller is electrically connected to the control end of the cooling tower 51 to control the cooling effect of the cooling tower 51 on the coolant. This allows the initial temperature of the coolant to be adjusted according to actual production needs.

[0027] Specifically, in this embodiment, the liquid cooling mechanism 5 also includes a water storage tank 52 connected to the liquid outlet pipe 13 on the cooling base 1 and the liquid inlet end of the cooling tower 51. A circulation pump is connected in the pipeline between the cooling tower 51 and the liquid inlet pipe 12 of the cooling base 1. The circulation pump can draw the coolant from the water storage tank 52 into the cooling tower 51 for cooling, and then deliver it to the liquid cooling cavity 11 of the cooling base 1 to exchange heat with the shell. The heated coolant then flows back into the water storage tank 52, forming a coolant circulation. In the initial stage of shell cooling, the coolant absorbs heat from the shell and flows into the water storage tank 52, causing the coolant temperature inside the water storage tank 52 to rise. At this time, it is necessary to increase the heat exchange power of the cooling tower 51 to ensure that a stable low-temperature coolant is delivered into the liquid cooling cavity 11.

[0028] Specifically, in this embodiment, during the shell cooling stage, since the heat exchange temperature changes as the shell temperature decreases, the first temperature sensor 3 monitors the coolant temperature at the inlet of the liquid cooling chamber 11 to adjust the operating power of the cooling tower 51 in real time. This ensures the stability of the coolant temperature input into the liquid cooling chamber 11, guaranteeing stable heat exchange with the shell. Simultaneously, as the shell temperature decreases, the operating power of the cooling tower 51 can be reduced, thereby lowering power consumption costs.

[0029] Based on the same inventive concept, see also Figure 1 , Figure 3 This application also provides a method for sequential solidification and cooling of silica sol precision casting, using the aforementioned silica sol precision casting sequential solidification and cooling device, including the following steps: S1, through the controller, the solenoid valve 2 is opened to allow the coolant to flow through the liquid cooling chamber 11. After coolant flows out of the outlet of the liquid cooling chamber 11, the inlet and outlet temperatures of the liquid cooling chamber 11 are monitored by the first temperature sensor 3 and the second temperature sensor 4. S2, place the cast shells sequentially onto the top surface of the cooling base 1, and make one side of the thicker part of the casting on the shell abut against the cooling base 1; S3, define the stable range of temperature difference between the liquid outlet and the liquid inlet of the liquid cooling chamber 11 as the first range value, and monitor the temperature difference between the liquid inlet and the liquid outlet of the liquid cooling chamber 11; S4, when the temperature difference between the liquid outlet and the liquid inlet of the liquid cooling chamber 11 exceeds the first range value, the opening of the solenoid valve 2 is increased by the controller until the temperature difference is within the first range value.

[0030] The silica sol precision casting sequential solidification and cooling method provided in this embodiment, compared with the prior art, in the initial state of the cooling device, stably delivers coolant to the liquid cooling cavity 11 through the liquid cooling mechanism 5, and heat exchange occurs between the coolant and the mold shell. This application uses a first temperature sensor 3 and a second temperature sensor 4 to monitor the temperature of the inlet and outlet of the liquid cooling cavity 11 on the cooling base 1. Based on the monitored temperature difference between the inlet and outlet, the opening of the solenoid valve 2 is controlled. When the temperature difference is large, the opening of the solenoid valve 2 is increased, thereby increasing the flow rate inside the liquid cooling cavity 11. This ensures the uniformity of the coolant temperature inside the liquid cooling cavity 11, allowing multiple mold shells placed on the cooling base 1 to exchange heat synchronously. Furthermore, it maintains a stable temperature within the corresponding range of the same mold shell, avoiding large temperature differences that could lead to uneven heat exchange inside the mold shell and affect the casting quality. This application can adjust the opening of the solenoid valve 2 by monitoring the internal temperature difference of the liquid cooling cavity 11, thereby controlling the overall temperature of the liquid inside the liquid cooling cavity 11, ensuring uniform heat exchange for multiple mold shells, and thus improving the forming quality of the castings in the later stage.

[0031] Specifically, in this embodiment, before placing the mold shells onto the cooling base 1, the controller controls the solenoid valve 2 to open to an initial opening degree, which is less than the maximum opening degree of the solenoid valve 2. The controller also controls the circulation pump on the liquid outlet of the liquid cooling mechanism 5 to start working. The coolant is drawn from the water storage tank 52 into the cooling tower 51 for cooling and then pumped into the liquid cooling cavity 11 on the cooling base 1. After the liquid cooling cavity 11 is filled with coolant, the mold shells are placed on top of the cooling base 1 in sequence. During the placement of the mold shells, the temperature of the coolant will rise, so the temperature difference between the inlet and outlet of the liquid cooling cavity 11 will increase. When the temperature difference exceeds the maximum value of the first range, the opening degree of the solenoid valve 2 can be increased to accelerate the flow rate and velocity inside the liquid cooling cavity 11, thereby stabilizing the temperature at each stage inside the liquid cooling cavity 11 and ensuring that multiple mold shells can dissipate heat stably and evenly.

[0032] In some embodiments, the opening degree of solenoid valve 2 in step 1 is defined as the initial opening degree. In step 4, when the temperature difference between the liquid outlet and the liquid inlet of the liquid cooling chamber 11 is lower than a first range value, the opening degree of solenoid valve 2 is reduced by the controller until the opening degree of solenoid valve 2 returns to the initial opening degree. Specifically, in this embodiment, the minimum value of the first range value of the temperature difference between the liquid inlet and the liquid outlet of the liquid cooling chamber 11 is greater than 0. Preferably, the first range value is 2-4℃. When the temperature difference between the liquid outlet and the liquid inlet is higher than 4℃, the opening degree of the regulating valve is increased. When the temperature difference between the liquid outlet and the liquid inlet is between 2-4℃, it proves that the coolant can meet the stable heat dissipation of multiple shells. When the temperature difference between the liquid outlet and the liquid inlet is lower than 2℃, the opening degree of solenoid valve 2 can be reduced, thereby reducing the load on each working component and playing an automatic energy-saving and consumption-reducing role.

[0033] Specifically, in this embodiment, during the later stages of cooling, the shell's own temperature decreases, thus eliminating the need for a large flow rate of coolant to cool the shell. To reduce the overall power consumption of the device, monitoring the temperature difference between the inlet and outlet can be used. This allows for automatic control of the reduction in the operating power of each module as the shell temperature decreases.

[0034] Specifically, in this embodiment, the circulating pump on the liquid cooling mechanism 5 is a variable frequency pump. Since the opening degree of the solenoid valve 2 changes, the variable frequency pump can change its operating power according to the change of the opening degree of the solenoid valve 2, ensuring the stability of the coolant output. In this embodiment, as the flow rate and velocity inside the liquid cooling cavity 11 decrease, the load on the circulating pump on the liquid cooling mechanism 5 can be reduced, achieving the effect of energy saving and consumption reduction.

[0035] In some embodiments, step 4 further includes monitoring multiple temperature values ​​at the outlet of the liquid cooling cavity 11 over a certain period of time, analyzing the temperature change trend at the outlet of the liquid cooling cavity 11, and stopping the reduction of the opening of the solenoid valve 2 when the temperature difference between the inlet and outlet exceeds a first range value and the temperature change trend is downward, maintaining the existing opening. During the cooling process of the mold shell, the inlet temperature of the liquid cooling cavity 11 is stabilized within a certain range by the control of the liquid cooling mechanism 5. Therefore, the temperature difference between the inlet and outlet of the liquid cooling cavity 11 is mainly determined by the temperature change of the coolant at the outlet of the liquid cooling cavity 11. After the cast mold shell is placed on top of the cooling base 1, the coolant inside the liquid cooling cavity 11 absorbs heat and its temperature rises, thereby causing the monitored temperature at the outlet of the liquid cooling cavity 11 to rise. After rising to a certain temperature value, the temperature difference between the outlet and inlet will exceed the first range value. At this time, it is necessary to increase the opening of the solenoid valve 2 to increase the flow rate and velocity of the coolant.

[0036] Specifically, in this embodiment, during the cooling process, the temperature of the shell gradually decreases, leading to a reduction in the heat absorption of the coolant. Consequently, the temperature at the outlet of the liquid cooling chamber 11 tends to decrease. After the coolant temperature output from the liquid cooling chamber 11 decreases, under the same power of the liquid cooling mechanism 5, the temperature at the inlet of the liquid cooling chamber 11 will also decrease. This will also affect the temperature difference between the inlet and outlet. By analyzing the temperature change trend at the outlet, when the outlet temperature shows a decreasing trend, the change in temperature difference caused by the inlet temperature does not require adjustment of the opening of the solenoid valve 2. This reduces repeated adjustments to the solenoid valve 2. Furthermore, because the outlet temperature shows a decreasing trend, the coolant temperature at the outlet will continue to decrease until the temperature difference between the outlet and inlet returns to the first range.

[0037] In some embodiments, the acceptable temperature range of the liquid inlet of the liquid cooling chamber 11 is defined as a second range value. The temperature value of the liquid inlet of the liquid cooling chamber 11 is monitored. When the temperature value exceeds the second range value, the controller controls the liquid cooling mechanism 5 to increase the cooling effect. If the temperature value is lower than the second range value, the controller controls the cooling effect of the liquid cooling mechanism 5 to decrease. In this embodiment, during the operation of the liquid cooling mechanism 5, the liquid cooling mechanism 5 cools the coolant through the cooling tower 51. The cooling method of the coolant is heat exchange cooling. Therefore, in order to ensure that the output coolant temperature is within a certain stable range, when the temperature of the coolant entering the cooling tower 51 is high, the heat dissipation capacity of the cooling tower 51 needs to be increased, and the operating power consumption of the cooling tower 51 will increase. When the temperature of the coolant entering the cooling tower 51 is low, the heat dissipation capacity of the cooling tower 51 can be reduced, and the operating power consumption of the cooling tower 51 will decrease.

[0038] Specifically, in this embodiment, the operator can freely set the second range of qualified liquid inlet temperature according to the required cooling temperature of the mold shell.

[0039] Specifically, in this embodiment, during the initial cooling of the shell, the coolant circulates between the liquid cooling cavity 11 and the cooling tower 51 due to the high shell temperature. During the initial operation, the temperature of the coolant output from the liquid cooling cavity 11 will be relatively high due to the high shell temperature. To ensure effective cooling of the shell in the later stage, the temperature at the liquid inlet of the liquid cooling cavity 11 is monitored by the first temperature sensor 3, thereby automatically adjusting the operating power of the cooling tower 51 to ensure the stability of the input temperature of the liquid cooling cavity 11.

[0040] Specifically, in this embodiment, the cooling tower 51 is equipped with multiple blowers to accelerate the cooling process. The controller is electrically connected to the blowers. When it is necessary to increase the power of the liquid cooling mechanism 5, the speed or number of blowers is increased, thereby increasing the heat dissipation effect on the coolant. Conversely, when it is necessary to reduce the power of the liquid cooling mechanism 5, the speed or number of blowers is reduced, achieving energy saving and consumption reduction.

[0041] In this embodiment, by monitoring the temperature at the inlet of the liquid cooling chamber 11 and controlling the input temperature of the coolant, and by monitoring the temperature difference between the inlet and outlet and controlling the flow rate and velocity, it is possible to ensure that the temperature of the coolant inside the liquid cooling chamber 11 is within a certain range, and at the same time, it is possible to ensure that the temperature difference of the coolant in the entire cooling base 1 along the first direction is stable within a certain range.

[0042] Specifically, in this embodiment, during the initial stage of shell cooling, the operating power of the cooling tower 51 increases to ensure effective cooling of the coolant. However, as the shell temperature decreases, during the later stage of shell cooling, by monitoring the temperature at the inlet of the liquid cooling chamber 11, when the coolant temperature falls below a second range value, the controller can reduce the operating power of the cooling tower 51, achieving automatic energy saving. The operating power of the cooling tower 51 can be automatically adjusted according to changes in the shell's own temperature.

[0043] In some embodiments, during the power control of the liquid cooling mechanism 5, especially during the initial cooling of the mold shell, when the temperature difference between the liquid outlet and inlet of the liquid cooling cavity 11 is higher than a first range value and the temperature at the liquid inlet of the liquid cooling cavity 11 is lower than a second range value, the power of the liquid cooling mechanism 5 remains unchanged. When the temperature at the liquid inlet of the liquid cooling cavity 11 is lower than the second range value and the temperature difference between the liquid outlet and inlet of the liquid cooling cavity 11 is higher than the first range value, the temperature of the mold shell is higher, and the heat exchange efficiency of the coolant inside the liquid cooling cavity 11 is higher, resulting in a rapid increase in the temperature of the coolant after passing through the liquid cooling cavity 11. The temperature of the heated coolant after passing through the liquid cooling mechanism 5 also increases accordingly. Therefore, this application does not need to reduce the power of the liquid cooling mechanism 5 in the early stage, avoiding repeated adjustments to the power of the liquid cooling mechanism 5 after the coolant heats up later. At the same time, the lower temperature of the coolant in the early stage can more effectively improve the heat dissipation efficiency of the mold shell. At this time, it is only necessary to adjust the opening of the solenoid valve 2 to regulate the flow rate and velocity inside the liquid cooling chamber 11. As the coolant circulates, the temperature at the inlet of the liquid cooling chamber 11 will automatically rise to the second range value.

[0044] Specifically, in this embodiment, during the adjustment of the operating power of the cooling tower 51 in the liquid cooling mechanism 5, while monitoring the temperature of the liquid inlet of the liquid cooling chamber 11, it is also necessary to combine the monitoring of the temperature difference between the liquid inlet and outlet of the liquid cooling chamber 11, and prioritize adjusting the opening of the solenoid valve 2. After the overall temperature inside the liquid cooling chamber 11 stabilizes, if the temperature of the liquid inlet of the liquid cooling chamber 11 is still lower than the second range value, the operating power of the liquid cooling mechanism 5 is reduced to reduce energy consumption.

[0045] In some embodiments, during the later stages of shell cooling, when the temperature difference between the liquid outlet and inlet of the liquid cooling cavity 11 is lower than a first range value, the cooling effect of the liquid cooling mechanism 5 is preferentially reduced and the temperature at the inlet of the liquid cooling cavity 11 is stabilized to be no higher than the highest value of the second range value. Then, the opening of the solenoid valve 2 is adjusted so that the temperature difference between the inlet and outlet of the liquid cooling cavity 11 is within the first range value. After the shell temperature decreases, the heat exchange efficiency of the coolant inside the liquid cooling cavity 11 will also decrease. After the temperature difference between the liquid outlet and inlet of the liquid cooling cavity 11 is less than the first range value, the temperature of the coolant has reached low-temperature saturation. The operating power of the liquid cooling mechanism 5 is preferentially reduced until the cooling tower 51 in the liquid cooling mechanism 5 reaches the minimum operating power, thereby reducing energy consumption. At the same time, it is necessary to ensure that the temperature at the inlet of the liquid cooling cavity 11 is no higher than the highest value of the second range value, so as to preferentially reduce energy consumption before adjusting the overall temperature inside the liquid cooling cavity 11.

[0046] Specifically, in this embodiment, when the temperature difference between the liquid outlet and the liquid inlet of the liquid cooling chamber 11 is lower than the first range value, directly adjusting the opening of the solenoid valve 2 can easily cause the liquid cooling mechanism 5 to operate at high power, and the circulation speed and flow rate of the coolant inside the liquid cooling chamber 11 will be low, affecting the heat exchange efficiency. This application prioritizes reducing the operating power of the liquid cooling mechanism 5, which can quickly reduce power consumption while ensuring the flow rate and velocity inside the liquid cooling chamber 11.

[0047] Specifically, in this embodiment, under the above circumstances, the shell temperature has usually dropped to a certain temperature, the working state of the liquid cooling mechanism 5 is adjusted to be closed, and the opening degree of the solenoid valve 2 is adjusted to the initial opening degree and then no longer decreases, thereby ensuring the continuous operation of the liquid cooling state in the later stage.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A silica sol precision casting sequential solidification cooling apparatus, characterized by, include: Cooling base (1), the top surface of the cooling base (1) is used to place the shell, the cooling base (1) is provided with a liquid cooling cavity (11) for the flow of coolant, the length direction of the cooling base (1) is defined as the first direction, and the cooling base (1) is provided with an inlet pipe (12) and an outlet pipe (13) communicating with the liquid cooling cavity (11) at both ends along the first direction; A solenoid valve (2) is connected to the inlet pipe (12) and is used to control the flow rate inside the inlet pipe (12); The controller is electrically connected to the solenoid valve (2) and is used to control the opening degree of the solenoid valve (2); The first temperature sensor (3) is installed at the liquid inlet of the liquid cooling cavity (11) to monitor the liquid inlet temperature of the liquid cooling cavity (11); The second temperature sensor (4) is installed at the outlet of the liquid cooling chamber (11) to monitor the outlet temperature of the liquid cooling chamber (11). The first temperature sensor (3) and the second temperature sensor (4) are both electrically connected to the controller. The controller controls the opening of the solenoid valve based on the monitored value of the temperature difference between the inlet and outlet.

2. The silica sol precision casting sequential solidification and cooling apparatus of claim 1 wherein, The liquid cooling cavity (11) includes multiple flow channels that are connected end to end in sequence, and the length direction of the flow channels is set along the first direction. The multiple flow channels are arranged in sequence along the width direction of the cooling base (1).

3. The silica sol precision casting sequential solidification and cooling apparatus of claim 2, wherein, The cooling base (1) is inclined in the vertical direction in the first direction, and the height of the liquid outlet pipe (13) on the cooling base (1) is higher than the height of the liquid inlet pipe (12).

4. The silica sol precision casting sequential solidification and cooling apparatus of claim 1 wherein, The inlet pipe (12) on the cooling base (1) is also connected to a liquid cooling mechanism (5) for supplying coolant to the liquid cooling cavity (11), and the working end of the liquid cooling mechanism (5) is electrically connected to the controller.

5. A method for sequential solidification and cooling of silica sol precision casting, employing the silica sol precision casting sequential solidification and cooling apparatus according to any one of claims 1-4, characterized in that, Includes the following steps: S1, through the controller, control the solenoid valve (2) to open, so that the coolant flows through the liquid cooling chamber (11). After the coolant flows out of the outlet of the liquid cooling chamber (11), the inlet and outlet temperatures of the liquid cooling chamber (11) are monitored by the first temperature sensor (3) and the second temperature sensor (4). S2, place the cast shells sequentially onto the top surface of the cooling base (1), and make one side of the thick part of the casting on the shell abut against the cooling base (1); S3, define the stable range of temperature difference between the liquid outlet and the liquid inlet of the liquid cooling chamber (11) as the first range value, and monitor the temperature difference between the liquid inlet and the liquid outlet of the liquid cooling chamber (11); S4, when the temperature difference between the liquid outlet and the liquid inlet of the liquid cooling chamber (11) exceeds the first range value, the opening of the solenoid valve (2) is increased by the controller until the temperature difference is within the first range value.

6. The silicasol precision casting sequential solidification cooling process of claim 5 wherein, In step 1, the opening degree of the solenoid valve (2) is defined as the initial opening degree. In step 4, when the temperature difference between the liquid outlet and the liquid inlet of the liquid cooling chamber (11) is lower than the first range value, the opening degree of the solenoid valve (2) is reduced by the controller until the opening degree of the solenoid valve (2) is restored to the initial opening degree.

7. The silicasol precision casting sequential solidification cooling process according to claim 6, wherein, Step 4 also includes monitoring multiple temperature values ​​at the outlet of the liquid cooling chamber (11) within a certain time period, analyzing the temperature change trend at the outlet of the liquid cooling chamber (11), and stopping the reduction of the opening of the solenoid valve (2) when the temperature difference between the inlet and outlet exceeds the first range value and the temperature change trend is downward, and maintaining the existing opening.

8. The silicasol precision casting sequential solidification cooling process of claim 5 wherein, The qualified temperature range of the liquid inlet of the liquid cooling chamber (11) is defined as the second range value. The temperature value of the liquid inlet of the liquid cooling chamber (11) is monitored. When the temperature value exceeds the second range value, the liquid cooling mechanism (5) is controlled by the controller to increase the cooling effect. If the temperature value is lower than the second range value, the cooling effect of the liquid cooling mechanism (5) is reduced by the controller.

9. The silicasol precision casting sequential solidification cooling process of claim 8 wherein, When the temperature difference between the liquid outlet and the liquid inlet of the liquid cooling chamber (11) is higher than the first range value and the temperature value of the liquid inlet of the liquid cooling chamber (11) is lower than the second range value, the operating power of the liquid cooling mechanism (5) remains unchanged.

10. The silicasol precision casting sequential solidification cooling process of claim 8 wherein, When the temperature difference between the liquid outlet and the liquid inlet of the liquid cooling chamber (11) is lower than the first range value, the cooling effect of the liquid cooling mechanism (5) is reduced first and the temperature of the liquid inlet of the liquid cooling chamber (11) is stabilized so that it does not exceed the highest value of the second range value. Then the opening of the solenoid valve (2) is adjusted so that the temperature difference between the liquid inlet and the liquid outlet of the liquid cooling chamber (11) is within the first range value.

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