A nitrogen gas filling and heat preservation device for a heat preservation furnace

Abstract

The invention discloses a nitrogen gas-filled heat-insulating device for a heat-insulating furnace, comprising a heat-insulating furnace main body, a support frame and a nitrogen tank being fixed on the top surface of the right part of the bottom plate of the heat-insulating furnace main body, a gas storage shell being fixed on the upper part of the support frame, a solenoid valve being fixed on the upper part of the nitrogen tank, a gas outlet end of the nitrogen tank being connected to the gas inlet of the solenoid valve, the gas outlet of the solenoid valve being communicated with the gas storage shell through a connector, a main gas outlet pipe being connected to the side wall of the gas storage shell, the other end of the main gas outlet pipe extending into the gas inlet of the heat-insulating furnace main body and being communicated with the inner cavity of the heat-insulating furnace main body; the device adopts nitrogen as a protective gas to realize pressurization and enter the inner cavity of the heat-insulating furnace for use, the device will not react with molten metal, and the purity of the molten metal is ensured; at the same time, the nitrogen does not need to be discharged after use, and can be used continuously, so that the heat in the nitrogen will not be released in large quantities, and heat energy will not be wasted, and the temperature of the surrounding air will not be increased, and the normal operation of the surrounding employees is ensured.

Description

Technical field:

[0001] The invention relates to the technical field of metal processing equipment, and more specifically to a nitrogen gas filling and heat preservation device for a heat preservation furnace. Background technology:

[0002] In the existing insulation furnace, the furnace cover is generally fixed directly on the top of the insulation furnace, and a liquid riser is fixed on it. The bottom of the liquid riser extends into the molten metal placed in the inner cavity of the insulation furnace. At the same time, a plurality of heating rods are fixed on the inner wall of the insulation furnace to keep the molten metal in the inner cavity warm.

[0003] During its use, it is necessary to pressurize the external air and pump it into the upper part of the inner cavity, so that the molten metal in the lower part of the inner cavity is squeezed out from the riser tube to achieve casting. Then, the compressed air needs to be discharged and then filled with molten metal (when aluminum liquid is cast, the molten metal is aluminum liquid), and the compressed air is inflated and released. When the compressed air comes, it is compressed air at room temperature. When it is released, its temperature has reached about two or three hundred degrees. Then, after the discharge, the temperature of the air around it will increase. The first is to cause the loss of energy, and the second is that the surrounding temperature will rise, resulting in a very poor working environment for the employees.

[0004] Secondly, when the outside air is pressurized and enters the inner cavity of the insulation furnace, it will react with the molten metal inside. For example, when the inside is molten aluminum, it will oxidize the aluminum and form alumina when it comes into contact with the air, which will reduce the purity of the molten aluminum and affect its quality. Summary of the invention:

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a nitrogen inflation insulation device for an insulation furnace. The nitrogen is used as a protective gas to be pressurized and enter the inner cavity of the insulation furnace for use. The nitrogen will not react with the molten metal, thereby ensuring the purity of the molten metal. At the same time, the nitrogen does not need to be discharged after use, and can be used continuously, so that the heat in the nitrogen will not be released in large quantities, and heat energy will not be wasted, and the surrounding air temperature will not increase, thereby ensuring the normal operation of surrounding employees.

[0006] The solution of the present invention to solve the technical problem is:

[0007] A nitrogen gas-filled heat-insulating device for a heat-insulating furnace comprises a heat-insulating furnace main body, a support frame and a nitrogen tank are fixed on the right top surface of the bottom plate of the heat-insulating furnace main body, a gas storage shell is fixed on the upper part of the support frame, a solenoid valve is fixed on the upper part of the nitrogen tank, a gas outlet end of the nitrogen tank is connected to a gas inlet of the solenoid valve, the gas outlet of the solenoid valve is communicated with the gas storage shell through a connector, a main gas outlet pipe is connected to the side wall of the gas storage shell, the other end of the main gas outlet pipe extends into the gas inlet of the heat-insulating furnace main body and communicates with the inner cavity of the heat-insulating furnace main body;

[0008] An air bag is arranged in the air storage housing, and an end of the first air inlet pipe connected to the air bag extends out of the outer side wall of the air storage housing;

[0009] An air pump is installed on the right part of the bottom plate of the insulation furnace body, a first solenoid valve is fixed on the upper part of the air pump, the air outlet of the air pump is connected to the air inlet of the first solenoid valve, and the air outlet of the first solenoid valve is connected to the end of the first air inlet pipe through a connecting pipe.

[0010] An elastic seat is fixed on one side wall of the air storage shell, an outer elastic layer is arranged outside the airbag, a water flow cavity is formed between the outer elastic layer and the outer side wall of the airbag, and the outer elastic layer is fixed on the elastic seat.

[0011] The top of the outer elastic layer is connected with a liquid outlet hose, and the bottom of the outer elastic layer is connected with a liquid inlet hose. The outer ends of the liquid outlet hose and the liquid inlet hose both extend out of the gas storage housing.

[0012] A coolant circulating water tank is fixed to the top surface of the right part of the bottom plate of the insulation furnace body, a cover plate is fixed on the top of the coolant circulating water tank, a circulating liquid circulating pump is fixed on the top surface of the cover plate, the water inlet end of the circulating liquid circulating pump extends into the coolant circulating water tank and is fixed with a coolant inlet pipe extending vertically downward, the bottom end of the coolant inlet pipe extends into the coolant placed in the coolant circulating water tank, the liquid outlet end of the circulating liquid circulating pump is connected with the outer end of the liquid inlet hose through a connecting pipe, the outer end of the liquid outlet hose is connected with a return liquid connector connected to the cover plate of the coolant circulating water tank through a connecting pipe, and the liquid outlet end of the return liquid connector is connected to the coolant circulating water tank.

[0013] An exhaust head is fixed on the cover plate of the coolant circulating water tank, and the bottom of the exhaust head is communicated with the coolant circulating water tank.

[0014] A plurality of connecting plates are fixed to the front and rear of the bottom surface of the bottom plate of the insulation furnace body, a transmission shaft is movably connected to two corresponding front and rear connecting plates through bearings, a wheel is fixed to the end of the transmission shaft, a transmission sprocket is fixed to one end of the transmission shaft, a reduction motor is fixed to the top surface of the right part of the bottom plate of the insulation furnace body, a driving sprocket is fixed to the output shaft of the reduction motor, and a chain is tensioned on the driving sprocket and the transmission sprocket.

[0015] An adjusting block is fixed on the bottom surface of the bottom plate of the insulation furnace body, an adjusting through groove is formed in the middle of the adjusting block, and the moving block is inserted in the adjusting through groove; the top and bottom surfaces of the moving block are fixed with adjusting grooves extending left and right; the top and bottom surfaces of the adjusting through groove are fixed with guide bars, and the guide bars are inserted in the corresponding adjusting grooves; the right side wall of the moving block is movably connected with an adjusting screw, the adjusting screw is screwed on the side plate on the right side of the adjusting through groove, the right end of the adjusting screw extends out of the right side wall of the adjusting block and is fixed with a rotating part; the moving block is movably connected to a tensioning wheel through a bearing, and the tensioning wheel is pressed against the corresponding part of the chain.

[0016] A central through groove is formed in the middle of the top plate of the insulation furnace body, the upper cover plate is pressed against the top surface of the top plate of the insulation furnace body and covers the central through groove, a plurality of heating rods are fixed on the bottom surface of the upper cover plate, the heating rods extend into the inner cavity of the insulation furnace body, a plurality of liquid riser pipes are fixed on the upper cover plate, the liquid riser pipes extend into the inner cavity of the insulation furnace body, and the bottom ends of the liquid riser pipes extend into the molten metal placed in the inner cavity of the insulation furnace body.

[0017] The air inlet is located on the upper right side wall of the insulation furnace body.

[0018] A temperature sensor is fixed on the upper part of the left side plate of the insulation furnace body, and the sensing end of the temperature sensor extends into the inner cavity of the insulation furnace body.

[0019] A plurality of heat sinks and a fan frame extending forward and backward are fixed on the right side wall of the coolant circulation water tank, a cooling fan is fixed on the fan frame, and the cooling fan faces the heat sink.

[0020] The bottom surface of the top plate of the gas storage shell and the inner wall of the left plate are both fixed with heat exchange tubes coiled in an S shape, the heat exchange tubes are all over the bottom surface of the top plate of the gas storage shell and the inner wall of the left plate, and the liquid inlet and outlet ends of the heat exchange tubes both extend out of the outer wall of the gas storage shell;

[0021] The liquid outlet of the circulating liquid circulation pump is connected to one end of a three-way connector, the other end of the three-way connector is connected to the outer end of the liquid inlet hose through a connecting pipe, and another end of the three-way connector is connected to the liquid inlet end of the heat exchange tube through a connecting pipe;

[0022] The liquid inlet of the return liquid connector is connected to one end of the second three-way connector, the outer end of the liquid outlet hose is connected to one end of the second three-way connector through a connecting pipe, and the liquid outlet end of the heat exchange tube is connected to another end of the second three-way connector.

[0023] A central through groove is formed in the middle of the upper cover plate, the heat insulation plate is fixed on the upper cover plate and covers the central through groove, and the heating rod and the liquid riser are both installed on the heat insulation plate.

[0024] The heat insulation board comprises an upper fixing board, a middle asbestos board and a lower fixing board which are stacked and fixed.

[0025] A pressure sensor is fixed on the top plate of the gas storage shell, and the sensing end of the pressure sensor extends into the gas storage shell.

[0026] A one-way valve is connected to the top plate of the gas storage housing, a fixed cover is fixed to the gas outlet end of the one-way valve, a rubber bag is fixed to the top of the fixed cover, the rubber bag is connected to a plurality of through holes formed on the fixed cover, and the through holes are connected to the gas outlet end of the one-way valve;

[0027] The one-way valve comprises a valve body, which is fixed on the top surface of the top plate of the gas storage shell, the air inlet end of the valve body extends into the corresponding through hole of the top plate of the gas storage shell, a sealing ring is clamped between the outer wall of the air inlet end of the valve body and the inner wall of the through hole, an external thread is formed on the upper outer wall of the valve body, a fixed cover is screwed on the external thread, an extension column is formed or fixed in the middle of the bottom surface of the top plate of the fixed cover, the upper part of the compression spring is inserted on the extension column, a plurality of vertical guide strips are fixed on the inner wall of the valve body, a lifting plate is inserted in the valve body, and the vertical guide strips are inserted on the side wall of the lifting plate to form In the corresponding vertical guide groove of the type, a fixing column is fixed on the bottom surface of the lifting plate, a sphere is fixed on the bottom surface of the fixing column, a bottom end plate is fixed on the bottom end surface of the valve body, a bottom center through hole is formed in the middle of the bottom end plate, an annular rubber block is fixed on the top surface of the bottom end plate around the bottom center through hole, the lower part of the sphere is inserted into the middle through hole and the bottom center through hole of the annular rubber block, the lower outer wall of the sphere is pressed against the inner wall of the annular rubber block, the bottom end of the compression spring is pressed against the top surface of the lifting plate, and the top end of the compression spring is pressed against the bottom surface of the top plate of the fixed cover.

[0028] The outstanding effects of the present invention are:

[0029] It uses nitrogen as a protective gas to pressurize and enter the inner cavity of the insulation furnace for use. It will not react with the molten metal, ensuring the purity of the molten metal. At the same time, the nitrogen does not need to be discharged after use, and can be used continuously, so that the heat in the nitrogen will not be released in large quantities, and no heat energy will be wasted. In addition, the nitrogen can be reused to reduce consumption. Since the nitrogen is basically not discharged, the surrounding air temperature will not increase, ensuring the temperature of the surrounding environment, allowing surrounding employees to operate normally. Description of the drawings:

[0030] Figure 1 It is a partial structural schematic diagram of the present invention;

[0031] Figure 2 yes Figure 1 A partial enlarged view of

[0032] Figure 3 yes Figure 1 a partial enlarged view of another part;

[0033] Figure 4 yes Figure 1 There is also a partial enlarged view of a part;

[0034] Figure 5 yes Figure 3 A partial enlarged view of

[0035] Figure 6 It is a partial top view of the main body of the holding furnace (some parts such as the chain are not shown). Specific implementation method:

[0036] For example, see Figures 1 to 6 As shown, a nitrogen-filled heat preservation device for a heat preservation furnace includes a heat preservation furnace body 10, which is substantially the same as the structure of an existing heat preservation furnace, and therefore, will not be described in detail;

[0037] A plurality of connecting plates 11 are fixed to the front, middle and rear parts of the bottom surface of the bottom plate of the insulation furnace body 10, and the transmission shaft is movably connected to the two corresponding front and rear connecting plates 11 through bearings, and wheels 12 are fixed to the ends of the transmission shaft, and a transmission sprocket 13 is fixed to one end of one of the transmission shafts, and a reduction motor 14 is fixed to the top surface of the right part of the bottom plate of the insulation furnace body 10, and a driving sprocket 15 is fixed on the output shaft of the reduction motor 14, and a chain 16 is tensioned on the driving sprocket 15 and the transmission sprocket 13.

[0038] An adjusting block 17 is fixed to the bottom surface of the bottom plate of the insulation furnace body 10, and an adjusting through groove is formed in the middle of the adjusting block 17. The moving block 18 is inserted in the adjusting through groove. The top and bottom surfaces of the moving block 18 are fixed with adjusting grooves extending left and right. The top and bottom surfaces of the adjusting through groove are fixed with guide bars 171, and the guide bars 171 are inserted in the corresponding adjusting grooves. The right side wall of the moving block 18 is movably connected with an adjusting screw 181, and the adjusting screw 181 is screwed on the side plate on the right side of the adjusting through groove. The right end of the adjusting screw 181 extends out of the right side wall of the adjusting block 17 and is fixed with a rotating part. The right part of the adjusting screw 181 is screwed with a locking nut, and the end face of the locking nut is pressed against one end face of the adjusting block 17. The moving block 18 is movably connected to a tensioning wheel 182 through a bearing, and the tensioning wheel 182 is pressed against the corresponding part of the chain 16.

[0039] This structure makes it easy to move the insulation furnace body 10. The movement of the insulation furnace body 10 can be achieved by running the reduction motor 14. At the same time, by loosening the locking nut and rotating the rotating part of the adjusting screw 181, the adjusting screw 181 can be rotated, and the moving block 18 can be moved left and right along the adjusting slot. At the same time, the locking nut needs to be tightened to change the tension of the chain 16 and realize the normal transmission of the chain 16.

[0040] Furthermore, a support frame 20 and a nitrogen tank 30 are fixed to the top right surface of the bottom plate of the insulation furnace main body 10, a gas storage shell 40 is fixed to the upper part of the support frame 20, a solenoid valve 31 is fixed to the upper part of the nitrogen tank 30, the gas outlet end of the nitrogen tank 30 is connected to the gas inlet of the solenoid valve 31, the gas outlet of the solenoid valve 31 is communicated with the gas storage shell 40 through a connecting head, and a main gas outlet pipe 41 is connected to the side wall of the gas storage shell 40, the other end of the main gas outlet pipe 41 extends into the gas inlet of the insulation furnace main body 10 and is communicated with the inner cavity of the insulation furnace main body 10; the gas inlet is located on the upper right side wall of the insulation furnace main body 10.

[0041] The air storage housing 40 is provided with an air bag 50, and the end of the first air inlet pipe 51 connected to the air bag 50 extends out of the outer wall of the air storage housing 40;

[0042] A second support frame is installed on the right part of the bottom plate of the insulation furnace body 10, and an air pump 60 is fixed on the top surface of the second support frame. A first solenoid valve 61 is fixed on the upper part of the air pump 60. The air outlet end of the air pump 60 is connected to the air inlet end of the first solenoid valve 61, and the air outlet end of the first solenoid valve 61 is connected to the end of the first air inlet pipe 51 through a connecting pipe.

[0043] Furthermore, an elastic seat 1 is fixed on one side wall of the gas storage housing 40, an outer elastic layer 52 is provided on the outside of the airbag 50, a water flow cavity 53 is formed between the outer elastic layer 52 and the outer side wall of the airbag 50, and the outer elastic layer 52 is fixed on the elastic seat 1. The outer elastic layer 52 and the airbag 50 are both made of high temperature resistant materials, such as high temperature resistant silicone rubber, and the highest stability can withstand high temperatures of up to 300°C.

[0044] Furthermore, the top of the outer elastic layer 52 is connected to a liquid outlet hose 54 , and the bottom of the outer elastic layer 52 is connected to a liquid inlet hose 55 . The outer ends of the liquid outlet hose 54 and the liquid inlet hose 55 both extend out of the gas storage housing 40 .

[0045] Furthermore, a coolant circulating water tank 70 is fixed to the top surface of the right part of the bottom plate of the insulation furnace body 10, a cover plate is fixed to the top of the coolant circulating water tank 70, a circulating liquid circulation pump 71 is fixed to the top surface of the cover plate, the water inlet end of the circulating liquid circulating pump 71 extends into the coolant circulating water tank 70 and is fixed with a coolant inlet pipe 72 extending vertically downward, the bottom end of the coolant inlet pipe 72 extends into the coolant placed in the coolant circulating water tank 70, and the liquid outlet end of the circulating liquid circulating pump 71 is connected to the outer end of the liquid inlet hose 55 through a connecting pipe.

[0046] Furthermore, an exhaust head 74 is fixed on the cover plate of the coolant circulating water tank 70, and the bottom of the exhaust head 74 is connected to the coolant circulating water tank 70. The exhaust head 74 can discharge the water vapor mixed in the refluxed liquid to prevent the internal air pressure of the coolant circulating water tank 70 from being too high, and a water inlet is also formed on the cover plate of the coolant circulating water tank 70 to facilitate water addition. A liquid level sensor is installed on the cover plate of the coolant circulating water tank 70. When the water is lower than the minimum liquid level set by the liquid level sensor, it can transmit the sensing signal to the control host, and the control host will control the alarm fixed on the control host to sound, reminding the operator to add water.

[0047] Furthermore, a central through groove 101 is formed in the middle of the top plate of the insulation furnace body 10, and the upper cover plate 80 is pressed against the top surface of the top plate of the insulation furnace body 10 and covers the central through groove 101. A sealing strip is clamped between the bottom surface of the edge of the upper cover plate 80 and the top surface of the insulation furnace body 10 to achieve sealing. A plurality of heating rods 81 are fixed to the bottom surface of the upper cover plate 80, and the heating rods 81 extend into the inner cavity of the insulation furnace body 10. A plurality of liquid riser pipes 82 are fixed on the upper cover plate 80, and the liquid riser pipes 82 extend into the inner cavity of the insulation furnace body 10. The bottom end of the liquid riser pipe 82 extends into the molten metal placed in the inner cavity of the insulation furnace body 10. The portion of the riser tube 82 that is in the molten metal can perform immersion heating on the molten metal, while the portion that is above the molten metal can perform radiation heating on the nitrogen in the inner cavity of the insulation furnace body 10, so that the temperature of the portion of the riser tube 82 that is in the nitrogen is also increased, thereby ensuring that the temperature of the subsequent molten metal flowing out of the riser tube 82 is stable, and it also ensures that the temperature of the gate at the top of the riser tube 82 will not be too low, thereby ensuring the casting effect.

[0048] A central through groove is formed in the middle of the upper cover plate 80, and a heat insulation plate 83 is fixed on the upper cover plate 80 and covers the central through groove, and the heating rod 81 and the liquid riser 82 are both installed on the heat insulation plate 83. The heat insulation plate 83 is formed by stacking and fixing an upper fixed plate, a middle asbestos plate and a lower fixed plate.

[0049] Since a detachable upper cover plate 80 is adopted and the heating rod 81 is fixed on the upper cover plate 80 , when the heating rod 81 needs to be cleaned or replaced, it is only necessary to dismantle the upper cover plate 80 for replacement, which is very convenient.

[0050] At the same time, in the present embodiment, five riser pipes 82 are installed on the upper cover plate 80, and their positions correspond to the casting ports of the corresponding molds (the positions of the upper cover plate 80 and the riser pipes 82 in the present embodiment correspond to the casting ports of the sub-frame casting mold to achieve casting). When other molds are replaced, it is only necessary to replace the entire upper cover plate 80 with the upper cover plate 80 equipped with the riser pipes 82 corresponding to the casting ports of the corresponding molds (of course, a plurality of heating rods 81 are fixed to the bottom surface of the upper cover plate 80, and the positions of the heating rods 81 on the upper cover plate 80 can also be changed as needed). Therefore, the use of this structure greatly improves its flexibility and can meet the casting needs of different molds. Moreover, the heating rod 81 in this embodiment is vertically arranged on the upper cover 80, so it will not interfere with the riser 82, that is, when the riser 82 is installed, it is also vertically downward, and will not touch or block the adjacent heating rod 81. Compared with the original heating rod horizontally installed in the inner cavity of the insulation furnace body 10, no matter how the riser 82 is installed on the upper cover 80, as long as it is not installed at the position of the upper cover 80 where the heating rod 81 is installed, there will be no interference. Moreover, when the upper cover 80 is replaced, it is disassembled and replaced as a whole, that is, the riser 82 and the heating rod 81 thereon are disassembled and replaced together with the upper cover 80, and it is convenient to install and disassemble.

[0051] Furthermore, a temperature sensor 2 is fixed to the upper part of the left side plate of the insulation furnace body 10, and the sensing end of the temperature sensor 2 extends into the inner cavity of the insulation furnace body 10. The temperature of the inner cavity of the insulation furnace body 10 can be known at all times through the temperature sensor 2.

[0052] Furthermore, a plurality of heat sinks 75 and a fan frame 76 extending forward and backward are fixed on the right side wall of the cooling liquid circulation water tank 70, and a cooling fan 77 is fixed on the fan frame 76, and the cooling fan 77 faces the heat sink 75. This structure can accelerate the cooling speed of the cooling liquid (water is used in this embodiment) after heat exchange in the cooling liquid circulation water tank 70, so as to ensure that the temperature of the water flowing in the water flow cavity 53 formed between the outer elastic layer 52 and the outer side wall of the airbag 50 is lower than the temperature of the nitrogen in the air storage shell 40, so that the heat of the nitrogen in contact with the outer elastic layer 52 can be reduced by the water, reducing the impact on the outer elastic layer 52 and improving its service life.

[0053] The bottom surface of the top plate of the gas storage housing 40 and the inner wall of the left plate are both fixed with heat exchange tubes 3 coiled in an S shape, and the heat exchange tubes 3 are all over the bottom surface of the top plate of the gas storage housing 40 and the inner wall of the left plate, and the liquid inlet end and the liquid outlet end of the heat exchange tube 3 are both extended out of the outer wall of the gas storage housing 40;

[0054] The liquid outlet of the circulating liquid circulation pump 71 is connected to one end of a three-way connector, the other end of the three-way connector is connected to the outer end of the liquid inlet hose 55 through a connecting pipe, and another end of the three-way connector is connected to the liquid inlet end of the heat exchange tube 3 through a connecting pipe;

[0055] The liquid inlet of the liquid return connector 73 is connected to one end of the second three-way connector, the outer end of the liquid outlet hose 54 is connected to one end of the second three-way connector through a connecting pipe, and the liquid outlet end of the heat exchange tube 3 is connected to another end of the second three-way connector.

[0056] The heat exchange tube 3 is provided to exchange heat with the nitrogen in the gas storage shell 40 through the water flowing inside, thereby reducing the temperature of the entire gas storage shell 40 and further ensuring the service life of the outer elastic layer 52 and the airbag 50 therein.

[0057] Furthermore, a pressure sensor 4 is fixed on the top plate of the gas storage housing 40 , and a sensing end of the pressure sensor 4 extends into the gas storage housing 40 .

[0058] A one-way valve 90 is connected to the top plate of the gas storage housing 40, a fixed cover 91 is fixed to the gas outlet end of the one-way valve 90, a rubber bag 92 is fixed to the top of the fixed cover 91, the rubber bag 92 is connected to a plurality of through holes formed on the fixed cover 91, and the through holes are connected to the top of the valve body 93 of the one-way valve 90;

[0059] The one-way valve 90 includes a valve body 93, which is fixed on the top surface of the top plate of the gas storage shell 40. The lower end of the valve body 93 is an air inlet end, which extends into the corresponding through hole of the top plate of the gas storage shell 40. A sealing ring is clamped between the outer wall of the air inlet end of the valve body 93 and the inner wall of the through hole. An external thread is formed on the upper outer wall of the valve body 93, and a fixed cover 91 is screwed on the external thread. An extension column 94 is formed or fixed in the middle of the bottom surface of the top plate of the fixed cover 91. The upper part of the compression spring 95 is inserted on the extension column 94. A plurality of vertical guide strips 96 are fixed on the inner wall of the valve body 93. A lifting plate 97 is inserted in the valve body 93, and the vertical guide strips 96 are inserted in the lifting plate 97. In the corresponding vertical guide groove formed on the side wall, a fixing column is fixed to the bottom surface of the lifting plate 97, and a ball 98 is fixed to the bottom surface of the fixing column. A bottom end plate 99 is fixed to the bottom end surface of the valve body 93, and a bottom center through hole is formed in the middle of the bottom end plate 99. An annular rubber block 991 is fixed to the top surface of the bottom end plate 99 around the bottom center through hole. The lower part of the ball 98 is inserted into the middle through hole and the bottom center through hole of the annular rubber block 991, and the lower outer wall of the ball 98 is pressed against the inner wall of the annular rubber block 991. The bottom end of the compression spring 95 is pressed against the top surface of the lifting plate 97, and the top end of the compression spring 95 is pressed against the bottom surface of the top plate of the fixed cover 91.

[0060] This structure makes it possible for the gas pressure inside the gas storage shell 40 to be too high, and it will push the ball 98 upward, compress the compression spring 95, and lift the lifting plate 97. At this time, the gas will flow upward from the gap between the vertical guide bar 96 and the vertical guide groove, and finally, be discharged from the through hole on the fixed cover 91 into the rubber bag 92 (the rubber bag 92 is made of high temperature resistant material, and can be directly replaced and installed when it is damaged after a certain period of use), thereby reducing the gas pressure inside the gas storage shell 40. It mainly plays the role of relieving pressure, and at the same time, its nitrogen will not be discharged, reducing the waste of nitrogen. When the pressure is too high instantaneously and other control components are not adjusted in time, its nitrogen will burst the rubber bag 92, achieve exhaust and pressure relief, and in subsequent use, it is necessary to remove the broken rubber bag 92 and replace it with a new rubber bag 92; at the same time, by rotating the fixed cover 91, the height position of the fixed cover 91 can be adjusted, and the pressure of the compression spring 95 can be adjusted, so that it can be opened under different pressure conditions.

[0061] The pressure sensor 4 can detect the air pressure inside the gas storage shell 40 at all times and transmit this signal to the control host. The control host can compare this data with the set limit value. When the limit value is exceeded, it means that the pressure is too high. At this time, the alarm controlled by the control host will be triggered to remind the operator so that the operator can check it. The operator can control the first solenoid valve 61 of the air pump 60 to stop inflating the airbag 50. At the same time, the gas in the airbag 50 is discharged from the air outlet of the first solenoid valve 61. The first solenoid valve 61 can adopt an existing conventional solenoid valve, such as a three-position four-way valve, which connects one connection port of the three-position four-way valve to the first connection port of the airbag 50. The air inlet pipe 51 is connected, and there is also a connecting port connected to the air outlet of the air pump 60, and there are two connecting ports connected to the outside world. When its valve core is at one end position, the gas of the air pump 60 can enter the airbag 50 to achieve inflation. When the valve core moves to another position, the air outlet of the air pump 60 is connected from a connecting port connected to the outside world to achieve exhaust. The first air inlet pipe 51 of the airbag 50 is also connected to another connection connected to the outside world to achieve exhaust, so that the volume of the airbag 50 becomes smaller, thereby reducing the pressure inside the air storage shell 40. When the valve core is in the middle, the four connecting ports are not connected and are in a stopped state. This is a conventional structure and will not be described in detail here.

[0062] When this embodiment is in use, when the molten metal (molten aluminum in this embodiment) is poured into the inner cavity of the insulation furnace body 10, the solenoid valve 31 at the gas outlet end of the nitrogen tank 30 is opened, so that the nitrogen is released and fills the entire inner cavity, ensuring that the air pressure in the inner cavity is slightly greater than the external air pressure, so that when the molten metal is poured into the inner cavity, the external air basically does not enter the inner cavity;

[0063] The molten metal must not be higher than the liquid level line in the center of the inner cavity.

[0064] Then, when in use, the air pump 60 is operated, the first electromagnetic valve 61 is opened, and the gas rushes into the airbag 50 to expand it, and the outer elastic layer 52 is also expanded at the same time. At this time, the nitrogen in the gas storage shell 40 is pressed into the inner cavity, so that the molten metal is pressed downward. After the molten metal is poured into all the riser pipes 82, it is squeezed out from the top to the upper mold to achieve casting;

[0065] When casting is not needed, the first solenoid valve 61 operates to discharge the gas in the airbag 50. At this time, the pressure in the gas storage shell 40 will drop. At this time, part of the nitrogen in the inner cavity will flow back into the gas storage shell 40 without being emptied, so that the nitrogen can be recycled to reduce waste. Moreover, the heat loss is also reduced by not discharging the nitrogen.

[0066] In this embodiment, nitrogen is used, which has a protective effect on the molten metal, reduces oxidation of the molten metal, and ensures casting quality.

[0067] Meanwhile, when in use, the circulating liquid circulating pump 71 is always running, so that there is always flowing water in the water flow cavity 53, thereby reducing the temperature of the elastic layer 52 and the airbag 50 and ensuring their service life.

[0068] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A nitrogen gas filling and heat preservation device for a heat preservation furnace, comprising a heat preservation furnace body (10), characterized in that: A support frame (20) and a nitrogen tank (30) are fixed on the top surface of the right part of the bottom plate of the insulation furnace body (10), a gas storage shell (40) is fixed on the upper part of the support frame (20), a solenoid valve (31) is fixed on the upper part of the nitrogen tank (30), the gas outlet end of the nitrogen tank (30) is connected to the gas inlet of the solenoid valve (31), the gas outlet of the solenoid valve (31) is communicated with the gas storage shell (40) through a connector, a main gas outlet pipe (41) is connected to the side wall of the gas storage shell (40), the other end of the main gas outlet pipe (41) extends into the gas inlet of the insulation furnace body (10) and is communicated with the inner cavity of the insulation furnace body (10); An air bag (50) is provided in the air storage housing (40), and an end of a first air inlet pipe (51) connected to the air bag (50) extends out of an outer side wall of the air storage housing (40); An air pump (60) is installed on the right part of the bottom plate of the insulation furnace body (10), a first electromagnetic valve (61) is fixed on the upper part of the air pump (60), an air outlet end of the air pump (60) is connected to an air inlet end of the first electromagnetic valve (61), and the air outlet end of the first electromagnetic valve (61) is connected to the end of the first air inlet pipe (51) through a connecting pipe; An elastic seat (1) is fixed on one side wall of the air storage housing (40); an outer elastic layer (52) is provided outside the air bag (50); a water flow cavity (53) is formed between the outer elastic layer (52) and the outer side wall of the air bag (50); and the outer elastic layer (52) is fixed on the elastic seat (1); The top of the outer elastic layer (52) is connected to a liquid outlet hose (54), and the bottom of the outer elastic layer (52) is connected to a liquid inlet hose (55), and the outer ends of the liquid outlet hose (54) and the liquid inlet hose (55) both extend out of the gas storage housing (40); A cooling liquid circulation water tank (70) is fixed to the top surface of the right part of the bottom plate of the insulation furnace body (10), a cover plate is fixed to the top of the cooling liquid circulation water tank (70), a circulating liquid circulation pump (71) is fixed to the top surface of the cover plate, a water inlet end of the circulating liquid circulation pump (71) extends into the cooling liquid circulation water tank (70) and is fixed with a cooling liquid inlet pipe (72) extending vertically downward, the bottom end of the cooling liquid inlet pipe (72) extends into the cooling liquid placed in the cooling liquid circulation water tank (70), the liquid outlet end of the circulating liquid circulation pump (71) is connected to the outer end of the liquid inlet hose (55) through a connecting pipe, the outer end of the liquid outlet hose (54) is connected to a return liquid connector (73) connected to the cover plate of the cooling liquid circulation water tank (70) through a connecting pipe, and the liquid outlet end of the return liquid connector (73) is connected to the cooling liquid circulation water tank (70).

2. The nitrogen gas filling and heat preservation device for a heat preservation furnace according to claim 1, characterized in that: A central through groove (101) is formed in the middle of the top plate of the insulation furnace body (10); an upper cover plate (80) is pressed against the top surface of the top plate of the insulation furnace body (10) and covers the central through groove (101); a plurality of heating rods (81) are fixed to the bottom surface of the upper cover plate (80); the heating rods (81) extend into the inner cavity of the insulation furnace body (10); a plurality of liquid riser pipes (82) are fixed to the upper cover plate (80); the liquid riser pipes (82) extend into the inner cavity of the insulation furnace body (10); and the bottom ends of the liquid riser pipes (82) extend into the molten metal placed in the inner cavity of the insulation furnace body (10).

3. The nitrogen gas filling and heat preservation device for a heat preservation furnace according to claim 1, characterized in that: The air inlet is located on the upper right side wall of the insulation furnace body (10).

4. The nitrogen gas filling and heat preservation device for a heat preservation furnace according to claim 1, characterized in that: A temperature sensor (2) is fixed to the upper part of the left side plate of the heat preservation furnace body (10), and the sensing end of the temperature sensor (2) extends into the inner cavity of the heat preservation furnace body (10).

5. The nitrogen gas filling and heat preservation device for a heat preservation furnace according to claim 1, characterized in that: A plurality of heat sinks (75) and a fan frame (76) extending forward and backward are fixed on the right side wall of the coolant circulation water tank (70); a cooling fan (77) is fixed on the fan frame (76); and the cooling fan (77) faces the heat sink (75).

6. The nitrogen gas filling and heat preservation device for a heat preservation furnace according to claim 1, characterized in that: The bottom surface of the top plate of the gas storage shell (40) and the inner wall of the left side plate are both fixed with heat exchange tubes (3) coiled in an S shape, the heat exchange tubes (3) are all over the bottom surface of the top plate of the gas storage shell (40) and the inner wall of the left side plate, and the liquid inlet end and the liquid outlet end of the heat exchange tube (3) both extend out of the outer wall of the gas storage shell (40); The liquid outlet end of the circulating liquid circulation pump (71) is connected to one end of a three-way connector, the other end of the three-way connector is connected to the outer end of the liquid inlet hose (55) through a connecting pipe, and another end of the three-way connector is connected to the liquid inlet end of the heat exchange tube (3) through a connecting pipe; The liquid inlet of the liquid return connector (73) is connected to one end of a second three-way connector, the outer end of the liquid outlet hose (54) is connected to one end of the second three-way connector via a connecting pipe, and the liquid outlet end of the heat exchange tube (3) is connected to another end of the second three-way connector.

7. The nitrogen gas filling and heat preservation device for a heat preservation furnace according to claim 2, characterized in that: A central through groove is formed in the middle of the upper cover plate (80); a heat insulating plate (83) is fixed on the upper cover plate (80) and covers the central through groove; and the heating rod (81) and the liquid riser (82) are both mounted on the heat insulating plate (83).

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