Intelligent door opening and closing device for holding furnace of low-pressure casting machine

Abstract

An intelligent door opening and closing device for a holding furnace of a low-pressure casting machine is characterized by comprising an intelligent recognition mechanism, a heat insulation furnace door mechanism, a spinning mechanism, a door opening mechanism and a control mechanism. The high-temperature-resistant vacuum box which is slightly smaller than the liquid adding opening and provided with the glass surface is adopted to replace an existing ceramic plate, the heat insulation effect of the heat insulation furnace door is improved, and energy consumption is reduced; the six spinning oil cylinders arranged on the furnace shell on the periphery of the liquid adding opening are used for pressing and sealing the heat-insulation furnace door, the pressure needed for pressing and sealing the heat-insulation furnace door is met, screw spinning is replaced, air leakage of a sealing strip is avoided, and the requirement for automation of pressing and sealing the heat-insulation furnace door is met; an electric contact pressure gauge arranged on a heating pipe housing on one side of the low-pressure furnace and an intelligent recognizer with a cooling fan and a cooling fan cover on an intelligent recognizer frame are adopted, and when the electric contact pressure gauge confirms that the heat preservation furnace has no pressure and the intelligent recognizer confirms that the position of a liquid adding bag is correct, liquid is automatically added into the heat preservation furnace; the method is suitable for black lamp production, reduces the casting production cost, and meets the requirements of black lamp production.

Description

Technical Field

[0001] The present application relates to the field of casting, and specifically to an intelligent door opening and closing device for a heat preservation furnace of a low-pressure casting machine. Background Art

[0002] The casting of lightweight alloy products in my country has been increasing. The use of low-pressure casting machines is a reliable equipment for casting high-quality lightweight alloy products. However, the liquid filling door of the low-pressure furnace used in the low-pressure casting machine is still a screw-spinning side-opening type (with photos attached), which requires manual operation. It is not only unsafe, inefficient and labor-intensive, but also not suitable for the needs of dark production. Summary of the Invention

[0003] In response to the above problems, the present application provides an intelligent door opening and closing device for a heat-insulating furnace of a low-pressure casting machine, which is characterized by comprising an intelligent identification mechanism, a heat-insulating furnace door mechanism, a spinning mechanism, a door opening mechanism, and a control mechanism;

[0004] The intelligent identification mechanism includes an electric contact pressure gauge on the heating tube cover on one side of the low-pressure furnace, a liquid filling port on the upper inclined surface of the front side of the low-pressure furnace shell, and an intelligent identification device frame (see attached) on the inclined surface of the furnace shell on the side of the liquid filling port. Figure 1 ), a cooling fan is provided on the intelligent identifier frame, an intelligent identifier is provided at the front end of the cooling fan, a cooling air cover is provided on the housing of the intelligent identifier, and connecting wires are provided between the electric contact pressure gauge, the cooling fan, the intelligent identifier and the control mechanism;

[0005] The low-pressure furnace door inclined surface is also provided with a heat-insulating furnace door mechanism, a spinning mechanism, and a door opening mechanism;

[0006] The heat-insulating furnace door mechanism includes a heat-insulating furnace door provided on the liquid-adding port of the low-pressure furnace, two pairs of two-piece door hinge plates with holes provided on the upper side of the heat-insulating furnace door, a furnace door connecting shaft provided in the holes of the door hinge plates, a door hinge bracket corresponding to the two pairs of two-piece door hinge plates with holes provided on the furnace door inclined surface above the liquid-adding port, a long hole provided in the door hinge bracket, a high-temperature resistant vacuum box with a mirror surface slightly smaller than the liquid-adding port provided in the heat-insulating furnace door, a sealing groove with the same shape as the liquid-adding port provided around the high-temperature resistant vacuum box, a high-temperature resistant sealing strip provided in the sealing groove, an outer edge of the furnace door provided on the outer side of the sealing groove, and four door-supporting springs provided on the upper and lower inclined surfaces on the outer side of the liquid-adding port below the outer edge of the furnace door (see attached Figure 1 ); There are two fisheye connecting plates with holes at the center of the furnace door, and the furnace door connecting shaft is set in the hole of the connecting plate (see attached Figure 3 ); A spinning mechanism is also provided around the liquid adding port, and a door opening mechanism is provided on the heat-insulating furnace door mechanism;

[0007] The spinning mechanism includes six spinning cylinders for sealing the heat-insulating furnace door, which are arranged on the furnace shell outside the liquid filling port. After the furnace door is closed with two door hinge brackets as fulcrums, the outside of the furnace door is pressed on four door springs. The spinning cylinder claws rotate 90 degrees and can be placed on the heat-insulating furnace door (see attached Figure 1 When the cylinder rod of the spinning cylinder contracts, the cylinder claws press the insulated furnace door down, compressing the four door-lift springs. The high-temperature resistant sealing strip under the door is pressed and sealed against the liquid filling port. When the cylinder rod extends, the door-lift spring rebounds and opens the furnace door smoothly, positioning the door hinge shaft above the long hole. The high-temperature resistant sealing strip of the insulated furnace door is disengaged from the liquid filling port, preventing friction between the high-temperature resistant sealing strip and the liquid filling port.

[0008] The door opening mechanism includes a door opening and closing oil cylinder bracket with a hole provided on the front side of the furnace plate on the upper side of the low-pressure furnace door (see attached Figure 3 ), a cylinder connecting shaft is provided in the hole of the cylinder bracket, and an opening and closing door cylinder is provided in the opening and closing door cylinder bracket; the tail end of the opening and closing door cylinder is connected to the opening and closing door cylinder bracket by a connecting shaft, and a fisheye connector is provided at the top of the cylinder rod of the opening and closing door cylinder, which is provided in a fisheye connecting plate with a hole and connected by a connecting shaft;

[0009] The control mechanism includes a control cabinet and a hydraulic station provided on one side of the low-pressure furnace, a liquid level detector provided on the low-pressure furnace, a contact switch provided above the long hole, a power supply for an intelligent identifier and a PLC electrical appliance provided in the control cabinet, and connecting lines of an electric contact pressure gauge, an intelligent identifier, a liquid level detector, and a contact switch connected to the power supply of the intelligent identifier and the PLC electrical appliance to control the intelligent opening and closing door of the holding furnace of the low-pressure casting machine; the PLC controls the liquid adding package to run to the front of the holding furnace after receiving an instruction that the holding furnace needs to be filled with liquid, and when the electric contact pressure gauge confirms that the holding furnace has no pressure and the intelligent identifier confirms that the liquid adding package is in the correct position, the liquid adding package automatically adds liquid to the liquid adding port of the holding furnace to the required liquid level;

[0010] The cooling fan can cool the intelligent identifier by guiding the air through the cooling air cover in a high temperature environment, thereby ensuring the long-term operation of the intelligent identifier;

[0011] The high temperature resistant sealing strip adopts ceramic packing;

[0012] The spinning cylinder and the hydraulic station are connected by a spinning cylinder oil pipe, and the door opening and closing cylinder and the hydraulic station are connected by an opening and closing cylinder oil pipe;

[0013] In the heat-insulating furnace door of the intelligent opening and closing door device for the holding furnace of a low-pressure casting machine, a mirrored high-temperature resistant vacuum box slightly smaller than the liquid filling port is used to replace the existing ceramic plate, thereby improving the heat insulation effect of the heat-insulating furnace door and reducing energy consumption.

[0014] The electric contact pressure gauge is used to confirm that the holding furnace has no pressure, the liquid level detector shows a low liquid level, and the intelligent identifier confirms that the liquid adding package has run to the specified position. The PLC then instructs the spinning cylinder to extend, and the spinning cylinder claw rotates 90 degrees to leave the insulation furnace door, allowing the insulation furnace door to disengage from the liquid adding port to ensure safe operation;

[0015] Four door-pushing springs are arranged above and below the outer inclined surface of the lower liquid-feeding port on the outside of the furnace door. When the spinning cylinder rod is extended, the door-pushing spring 11 rebounds to push the furnace door open, so that the door hinge link shaft is located above the long hole. After the high-temperature resistant sealing strip of the heat-insulating furnace door 4 is disengaged from the liquid-feeding port, the PLC instructs the door-opening and closing cylinder to retract and open the heat-insulating furnace door, avoiding friction between the high-temperature resistant sealing strip and the liquid-feeding port, thereby avoiding damage to the sealing strip and air leakage, extending the service life of the seal, and ensuring the stable quality of the low-pressure casting products of the insulation furnace;

[0016] Six spinning cylinders are installed on the furnace shell outside the liquid filling port to press and seal the thermal insulation furnace door. This meets the pressure required for press-sealing the thermal insulation furnace door, replaces screw spinning, avoids air leakage of the sealing strip, and meets the requirements of automatic press-sealing of the thermal insulation furnace door.

[0017] An electric contact pressure gauge is installed on the heating tube cover on one side of the low-pressure furnace, and an intelligent identifier with a cooling fan and a cooling air hood is installed on the intelligent identifier frame. When the electric contact pressure gauge confirms that the holding furnace has no pressure and the intelligent identifier confirms that the dosing bag is in the correct position, the holding furnace is automatically dosed with liquid. This is suitable for dark production, reduces casting production costs, and lays the foundation for increasing production capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of an intelligent opening and closing door device for a holding furnace of a low-pressure casting machine in this application.

[0019] Figure 2 for Figure 1 Schematic diagram of the structure of the left view part.

[0020] Figure 3 for Figure 2 An enlarged schematic diagram of the structure after the intelligent door is opened. DETAILED DESCRIPTION

[0021] The specific implementation methods of this application will be further described below with reference to the accompanying drawings.

[0022] The figure includes a low-pressure holding furnace 1, an electric contact pressure gauge 2, an intelligent identifier frame 3, an insulated furnace door 4, a spinning cylinder 5, a door hinge bracket 6, a door hinge plate 7, a door opening cylinder bracket 8, an opening and closing door cylinder 9, a fisheye connecting plate 10, a top door spring 11, a spinning cylinder claw 12, a spinning cylinder oil pipe 13, an opening and closing door cylinder oil pipe 14, a long hole 15, a liquid filling port 16, a high-temperature resistant vacuum box 17, a sealing groove 18, an outside of the furnace door 19, etc.

[0023] As shown in the figure, the present application is an intelligent door opening and closing device for a heat-insulating furnace of a low-pressure casting machine, comprising an intelligent identification mechanism, a heat-insulating furnace door mechanism, a spinning mechanism, a door opening mechanism, and a control mechanism;

[0024] The intelligent identification mechanism includes the electric contact pressure gauge 2 arranged on the heating tube cover on one side of the low-pressure furnace, the liquid filling port 16 arranged in the upper inclined surface of the front side of the low-pressure furnace shell, the intelligent identifier rack 3 arranged on the inclined front side of the furnace shell on the side of the liquid filling port, the cooling fan arranged on the intelligent identifier rack, the intelligent identifier arranged at the front end of the cooling fan, the cooling air hood arranged on the housing of the intelligent identifier, and the electric contact pressure gauge, cooling fan, intelligent identifier and control mechanism are provided with connecting wires;

[0025] The heat-insulating furnace door mechanism, the spinning mechanism, and the door opening mechanism are arranged on the inclined surface of the furnace door of the low-pressure furnace;

[0026] The heat-insulating furnace door mechanism includes the heat-insulating furnace door 4 arranged on the low-pressure furnace liquid filling port 16, the two pairs of two-piece door hinge plates 7 with holes are welded on the upper side of the heat-insulating furnace door, the furnace door connecting shaft is arranged in the hole of the door hinge plate, the door hinge bracket 6 corresponding to the two pairs of two-piece door hinge plates with holes is welded on the furnace door inclined surface on the upper side of the liquid filling port 16, the long hole 15 is arranged in the door hinge bracket 6, the mirrored high-temperature resistant vacuum box 17 with an outer shell slightly smaller than the inner opening size of the liquid filling port 16 is arranged in the heat-insulating furnace door, the sealing groove 18 with the same shape as the liquid filling port is arranged around the high-temperature resistant vacuum box, and the width is greater than the thickness of the material used for the liquid filling port; the high-temperature resistant sealing strip is arranged in the sealing groove, the furnace door outer edge 19 is arranged around the outer side of the sealing groove 18, and the four door-top springs 11 are arranged on the upper and lower inclined surfaces on the outer side of the liquid filling port under the furnace door outer edge (see attached Figure 1 The two fisheye connecting plates 10 with holes are arranged at the center position above the furnace door, and the furnace door connecting shaft is arranged in the connecting plate hole (see attached Figure 3 ); the spinning mechanism is arranged on the periphery of the liquid filling port, and the door opening mechanism is arranged on the heat-insulating furnace door;

[0027] The spinning mechanism includes six spinning cylinders 5 for sealing the heat-insulating furnace door 4, which are arranged on the furnace shell outside the liquid filling port 16. After the furnace door is closed with two door hinge brackets 6 as fulcrums, the spinning cylinders press on the four door springs 11 outside the furnace door. After the spinning cylinder rod is extended, the cylinder claws 12 rotate 90 degrees and are placed on the heat-insulating furnace door 4 (see attached Figure 1); when the cylinder rod of the spinning cylinder contracts, the cylinder claw 12 presses down the insulated furnace door 4, compressing the four door-top springs 11, and the high-temperature resistant sealing strip under the door is pressed and sealed with the liquid filling port 16; when the cylinder rod extends, the door-top spring 11 rebounds and opens the furnace door smoothly, so that the door hinge link shaft is located above the long hole 15, and the high-temperature resistant sealing strip of the insulated furnace door 4 is disengaged from the liquid filling port, avoiding friction between the high-temperature resistant sealing strip and the liquid filling port;

[0028] The door opening mechanism includes the door opening and closing oil cylinder bracket 8 with holes, which is arranged in the middle of the front side of the furnace plate on the upper side of the low-pressure furnace door (see the attached Figure 3 ), the cylinder connecting shaft is arranged in the cylinder bracket hole, the opening and closing door cylinder 9 is arranged in the opening and closing door cylinder bracket 8; the tail end of the opening and closing door cylinder 9 is connected to the opening and closing door cylinder bracket 8 by the cylinder connecting shaft, the fisheye connector is arranged at the top of the cylinder rod of the opening and closing door cylinder 9, the fisheye of the fisheye connector is arranged in the fisheye connecting plate 10 with a hole, and is connected by a connecting shaft;

[0029] The control mechanism includes the control cabinet and the hydraulic station arranged on one side of the low-pressure furnace, the liquid level detector is arranged beside the liquid riser, the contact switch is arranged above the long hole 15, the power supply for the intelligent identifier and the PLC electrical appliance are arranged in the control cabinet, and the connecting lines of the electric contact pressure gauge, the intelligent identifier, the liquid level detector, the liquid level detector, and the contact switch are connected to the power supply of the intelligent identifier and the PLC electrical appliance to control the intelligent opening and closing door of the insulation furnace of the low-pressure casting machine; it is convenient for the PLC to control the liquid adding bag to run to the front of the insulation furnace after receiving the instruction that the insulation furnace needs to add liquid. When the electric contact pressure gauge confirms that the insulation furnace has no pressure and the intelligent identifier confirms that the liquid adding bag is in the correct position, the liquid adding bag automatically adds liquid to the liquid adding port of the insulation furnace. When the liquid level detector detects the required height, it sends a stop instruction to the liquid adding bag. When the intelligent identifier recognizes that the liquid adding bag leaves the liquid adding port, the PLC instructs the opening and closing door cylinder rod to extend, close the insulation furnace door, and after the spinning cylinder rotates, the cylinder claw automatically presses and seals the insulation furnace door. No manual operation is required during the operation of the insulation furnace door.

[0030] The cooling fan can cool the intelligent identifier by guiding the air through the cooling air cover in a high temperature environment, thereby ensuring the long-term operation of the intelligent identifier;

[0031] The high temperature resistant sealing strip adopts ceramic packing;

[0032] The spinning cylinder and the hydraulic station are connected by a spinning cylinder oil pipe 13, and the door opening and closing cylinder 9 and the hydraulic station are connected by an opening and closing cylinder oil pipe 14;

[0033] In the heat-insulating furnace door of the intelligent opening and closing door device for the holding furnace of a low-pressure casting machine, a mirrored high-temperature resistant vacuum box slightly smaller than the liquid filling port is used to replace the existing ceramic plate, thereby improving the heat insulation effect of the heat-insulating furnace door and reducing energy consumption.

[0034] The electric contact pressure gauge is used to confirm that the holding furnace has no pressure. When the intelligent identifier confirms that the liquid adding bag is in the correct position, the PLC will instruct the spinning cylinder rod to extend, the spinning cylinder claw 12 to rotate 90 degrees, and the spinning cylinder claw will leave the insulation furnace door to ensure safe operation.

[0035] Four door-pushing springs 11 arranged above and below the outer inclined surface of the lower liquid-feeding port on the outside of the furnace door are used. When the spinning cylinder rod is extended, the door-pushing springs 11 rebound to push the furnace door open smoothly. The spinning cylinder claw 12 rotates 90 degrees, and the door hinge link shaft rises to the top of the long hole 15 and touches the contact switch to send a command to the PLC. The high-temperature resistant sealing strip of the heat-insulating furnace door 4 is smoothly disengaged from the liquid-feeding port, causing the door opening and closing cylinder to contract, opening the heat-insulating furnace door. This avoids friction between the high-temperature resistant sealing strip and the liquid-feeding port, which would damage the sealing strip and prevent air leakage, thereby extending the service life of the seal and ensuring the stable quality of the low-pressure casting products of the insulation furnace.

[0036] Six spinning cylinders arranged on the outer furnace shell of the liquid filling port 16 are used to press and seal the heat-insulating furnace door, which meets the pressure required for press-sealing the heat-insulating furnace door, replaces screw spinning, avoids air leakage of the sealing strip, and meets the requirements of automatic press-sealing of the heat-insulating furnace door;

[0037] An electric contact pressure gauge 2 is installed on the heating tube cover on one side of the low-pressure furnace, and an intelligent identifier with a cooling fan and a cooling air hood is installed on the intelligent identifier frame. When the electric contact pressure gauge confirms that the holding furnace has no pressure and the intelligent identifier confirms that the dosing bag is in the correct position, the holding furnace is automatically dosed with liquid. This system is suitable for dark production, reduces casting production costs, and increases production capacity.

[0038] The above description is only for explaining the implementation mode of the present application and is not intended to limit the present application. For those skilled in the art, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. An intelligent door opening and closing device for a holding furnace of a low-pressure casting machine, characterized in that: Including intelligent identification mechanism, heat insulation furnace door mechanism, spinning mechanism, door opening mechanism, control mechanism; The intelligent identification mechanism includes the electric contact pressure gauge arranged on the heating tube cover on one side of the low-pressure furnace, the liquid filling port arranged in the upper inclined surface of the front side of the low-pressure furnace shell, the intelligent identifier rack arranged on the front side of the inclined surface of the furnace shell on the side of the liquid filling port, the cooling fan arranged on the intelligent identifier rack, the intelligent identifier arranged at the front end of the cooling fan, the cooling air cover arranged on the housing of the intelligent identifier, and the electric contact pressure gauge, the cooling fan, the intelligent identifier and the control mechanism are provided with connecting wires; The heat-insulating furnace door mechanism, the spinning mechanism, and the door opening mechanism are arranged on the inclined surface of the furnace door of the low-pressure furnace; The heat-insulating furnace door mechanism includes the heat-insulating furnace door being arranged on the low-pressure furnace liquid filling port, the two pairs of two-piece door hinge plates with holes being welded to the upper side of the heat-insulating furnace door, the furnace door connecting shaft being arranged in the hole of the door hinge plate, the door hinge bracket corresponding to the two pairs of two-piece door hinge plates with holes being welded to the furnace door inclined surface on the upper side of the liquid filling port, the long hole being arranged in the door hinge bracket, the high-temperature resistant vacuum box with a mirror having an outer shell slightly smaller than the inner opening size of the liquid filling port being arranged in the heat-insulating furnace door, and the furnace door connecting shaft being arranged in the hole of the door hinge plate. Sealing grooves of the same shape are arranged around the high-temperature resistant vacuum box, and their width is greater than the thickness of the material used for the liquid filling port; the high-temperature resistant sealing strip is arranged in the sealing groove, the outer edge of the furnace door is arranged around the outer side of the sealing groove, and the four door springs are arranged on the upper and lower inclined surfaces outside the liquid filling port under the outer side of the furnace door; the two fisheye connecting plates with holes are arranged at the center position above the furnace door, and the furnace door connecting shaft is arranged in the hole of the connecting plate; the spinning mechanism is arranged around the outer side of the liquid filling port, and the door opening mechanism is arranged on the heat-insulating furnace door; The spinning mechanism includes six spinning cylinders for sealing the heat-insulating furnace door, which are arranged on the furnace shell outside the liquid filling port. After the furnace door is closed with two door hinge brackets as fulcrums, the spinning cylinders press on four door-top springs on the outside of the furnace door. After the spinning cylinder rod is extended, the cylinder claws rotate 90 degrees and are placed on the heat-insulating furnace door. When the cylinder rod of the spinning cylinder contracts, the cylinder claws press down the heat-insulating furnace door, compressing the four door-top springs, and the high-temperature resistant sealing strip under the door is pressed and sealed against the liquid filling port. When the cylinder rod is extended, the door-top spring rebounds to smoothly push the furnace door open, so that the door hinge link shaft is located above the long hole, and the high-temperature resistant sealing strip of the heat-insulating furnace door is disengaged from the liquid filling port, thereby avoiding friction between the high-temperature resistant sealing strip and the liquid filling port. The door opening mechanism includes the door opening and closing cylinder bracket 8 with a hole, which is arranged in the middle of the front side of the furnace mouth plate on the upper side of the low-pressure furnace door, the cylinder connecting shaft is arranged in the cylinder bracket hole, and the door opening and closing cylinder is arranged in the door opening and closing cylinder bracket; the tail end of the door opening and closing cylinder is connected to the door opening and closing cylinder bracket by the cylinder connecting shaft, the fisheye connector is arranged at the top of the cylinder rod of the door opening and closing cylinder, the fisheye of the fisheye connector is arranged in the fisheye connecting plate with a hole, and is connected by a connecting shaft; The control mechanism includes the control cabinet and the hydraulic station arranged on one side of the low-pressure furnace, the liquid level detector arranged beside the liquid riser, the contact switch arranged above the long hole, the power supply for the intelligent identifier and the PLC electrical appliance arranged in the control cabinet, the connecting lines of the electric contact pressure gauge, the intelligent identifier, the liquid level detector, the liquid level detector, and the contact switch are connected to the power supply of the intelligent identifier and the PLC electrical appliance to control the intelligent opening and closing door of the insulation furnace of the low-pressure casting machine; it is convenient for the PLC to control the liquid adding bag to run to the front of the insulation furnace after receiving the instruction that the insulation furnace needs to add liquid, and when the electric contact pressure gauge confirms that the insulation furnace has no pressure and the intelligent identifier confirms that the liquid adding bag is in the correct position, the liquid adding bag automatically adds liquid to the liquid adding port of the insulation furnace, and when the liquid level detector detects the required height, it sends a stop instruction to the liquid adding bag, and when the intelligent identifier recognizes that the liquid adding bag leaves the liquid adding port, the PLC instructs the opening and closing door oil cylinder rod to extend, close the insulation furnace door, and after the spinning cylinder rotates, the cylinder claw automatically presses and seals the insulation furnace door, and the operation of the insulation furnace door does not require manual labor; The cooling fan can cool the intelligent identifier by guiding the air through the cooling air cover in a high temperature environment, thereby ensuring the long-term operation of the intelligent identifier; The high temperature resistant sealing strip adopts ceramic packing; The spinning cylinder and the hydraulic station are connected by a spinning cylinder oil pipe, and the door opening and closing cylinder and the hydraulic station are connected by an opening and closing cylinder oil pipe.

2. The intelligent door opening and closing device for a holding furnace of a low-pressure casting machine according to claim 1, characterized in that: A high-temperature resistant vacuum box with a mirror that is slightly smaller than the liquid filling port is used to replace the existing ceramic plate to improve the thermal insulation effect of the thermal insulation furnace door and reduce energy consumption.

3. The intelligent door opening and closing device for a holding furnace of a low-pressure casting machine according to claim 1, characterized in that: The electric contact pressure gauge is used to confirm that the holding furnace has no pressure. When the intelligent identifier confirms that the liquid adding bag is in the correct position, the PLC will instruct the spinning cylinder rod to extend, the spinning cylinder claws to rotate 90 degrees, and the spinning cylinder claws to leave the insulation furnace door to ensure safe operation.

4. The intelligent door opening and closing device for a holding furnace of a low-pressure casting machine according to claim 1, characterized in that: Four door-pushing springs arranged on the upper and lower outer slopes of the lower liquid-filling port on the outside of the furnace door rebound to push the furnace door open smoothly when the spinning cylinder rod is extended. The spinning cylinder claws rotate 90 degrees, and the door hinge link shaft rises to the top of the long hole and touches the contact switch to send a command to the PLC. The high-temperature resistant sealing strip of the insulated furnace door is smoothly disengaged from the liquid-filling port, causing the door opening and closing cylinder to contract, opening the insulated furnace door to avoid friction between the high-temperature resistant sealing strip and the liquid-filling port, damaging the sealing strip and avoiding air leakage, extending the service life of the seal, and ensuring the stable quality of the low-pressure casting products of the insulation furnace.

5. The intelligent door opening and closing device for a holding furnace of a low-pressure casting machine according to claim 1, characterized in that: Six spinning cylinders arranged on the outer furnace shell of the liquid filling port are used to press-seal the insulated furnace door, which meets the pressure required for press-sealing the insulated furnace door, replaces screw spinning, avoids air leakage of the sealing strip, and meets the requirements of automatic press-sealing of the insulated furnace door.

6. The intelligent door opening and closing device for a holding furnace of a low-pressure casting machine according to claim 1, characterized in that: An electric contact pressure gauge is installed on the heating tube cover on one side of the low-pressure furnace, and an intelligent identifier with a cooling fan and cooling air hood is installed on the intelligent identifier frame. When the electric contact pressure gauge confirms that the holding furnace has no pressure and the intelligent identifier confirms that the dosing bag is in the correct position, the holding furnace is automatically dosed with liquid. It is suitable for dark production, reduces casting production costs, and improves production capacity.

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