Low-pressure heat preserving furnace with automatic overturning filter screen

Abstract

A low-pressure holding furnace with an automatic turnover filter screen is characterized by comprising an intelligent detection mechanism, an automatic filter screen turnover mechanism, a waste residue barrel return mechanism and a control mechanism, according to the intelligent detection mechanism, an electric contact pressure gauge is arranged on a heating pipe sealing cover on one side of the low-pressure furnace, a molten aluminum contact gauge and an intelligent recognizer are arranged on an inclined face on one side of a liquid adding opening of the low-pressure furnace, and a molten aluminum contact rod is arranged below the molten aluminum contact gauge. A filter screen is arranged on an oblique angle below the liquid adding opening and can automatically turn over; a waste residue barrel return mechanism is arranged at the lower part of the automatic filter screen overturning mechanism; a control device of the mechanisms is connected with a control mechanism; the lower ends of three molten aluminum contact rods arranged below the molten aluminum contact meter are in contact with the molten aluminum to display the low liquid level and the high liquid level of the molten aluminum, so that an incomplete product is prevented from being cast again; and the phenomena of incomplete casting of a tail product and waste of molten aluminum are avoided, the material and labor cost is reduced, the requirement for black lamp production is met, and the blank is filled for making a force towards casting.

Description

TECHNICAL FIELD

[0001] The application relates to the field of casting, in particular to a low-pressure holding furnace with an automatic turnover filter screen. BACKGROUND

[0002] Casting of light alloy products is increasing, and the low-pressure casting machine is a reliable equipment for casting high-quality light alloy products. Although the current low-pressure holding furnace has an intelligent opening and closing door device (application number: 202510968871.0), the stainless steel wire filter screen used when the liquid aluminum transfer ladle is added to the low-pressure holding furnace still needs to be manually operated, and there is a waste phenomenon of incomplete casting of the last product per furnace of aluminum liquid, and the labor cost is high. It is still not suitable for the needs of black light production. SUMMARY

[0003] In view of the above problems, the application provides a low-pressure holding furnace with an automatic turnover filter screen, characterized by comprising an intelligent detection mechanism, a filter screen automatic turnover mechanism, a waste residue bucket return mechanism, and a control mechanism.

[0004] The intelligent detection mechanism comprises an electric contact pressure gauge arranged on the sealing cover of the heating pipe on one side of the low-pressure furnace, an aluminum liquid contact table and an intelligent identifier arranged on the inclined surface on one side of the liquid inlet of the low-pressure furnace, and an aluminum liquid contact rod arranged below the aluminum liquid contact table. An automatic filter screen turnover is arranged on the inclined angle below the liquid inlet. A waste residue bucket return mechanism is arranged below the automatic filter screen turnover. The control devices of the above mechanisms are connected with the control mechanism.

[0005] The three aluminum liquid contact rods arranged below the aluminum liquid contact table are made of a built-in stainless steel rod sleeve high-purity carbon tube. The upper ends of the stainless steel rods are respectively linked with the lower contact and the upper contact in the aluminum liquid contact table. The lower ends can contact with the aluminum liquid, display the low liquid level and the high liquid level of the aluminum liquid, and respectively send signals to the PLC. When the aluminum liquid is used to the low liquid level, a signal is sent to the PLC to close the re-pressurization process, and the PLC controller sends a signal to the transfer ladle to add aluminum liquid, so as to avoid casting incomplete products again.

[0006] The automatic filter screen turnover mechanism comprises an automatic liquid adding door arranged on the liquid adding port; a door closing rotary pressure oil cylinder is arranged around the liquid adding port; a turnover shaft frame is arranged on the inclined angle below the liquid adding port; a turnover shaft of the stainless steel screen placing frame is arranged in the turnover shaft frame; a stainless steel screen placing frame is arranged on both sides of the turnover shaft frame; a screen placing opening is arranged in the screen placing frame; a stainless steel filter screen is arranged in the screen placing opening; a servo motor frame is arranged on one end of the screen placing frame; a multi-angle servo motor with a speed reducer is arranged on the servo motor frame; the output shaft of the speed reducer of the servo motor is linked to one end of the screen placing frame; a position sensor frame is arranged on the other end of the screen placing frame; a screen placing frame back position sensor, a screen placing frame liquid inlet position sensor and a screen placing frame slag removal position sensor are arranged on the position sensor frame; after the opening and closing door cylinder receives a signal of needing to add liquid and the door closing rotary pressure oil cylinder head moves away from the liquid adding door, the magnetic piston retracts to open the door, the proximity switch outside the cylinder sends a signal to the PLC, the PLC sends a command to the controller of the servo motor, and the servo motor rotates the screen placing frame with the stainless steel filter screen to the liquid adding port according to the set rotation angle (222 degrees); when the aluminum liquid contact surface is above the position, the signal is sent to the PLC, the PLC instructs the transfer package to stop adding liquid and leave the low-pressure furnace, and then instructs the slag bucket back position mechanism to extend the back position cylinder, and the up and down cylinders lift the slag bucket, and then instruct the servo motor driver to make the servo motor drive the screen placing frame to turn outward (130 degrees) to the slag removal position; when the screen placing frame reaches the slag removal position, the proximity switch sends a signal to the PLC, the PLC instructs the electromagnetic valve of the opening and closing door cylinder to close the liquid adding door, so that the filter slag on the stainless steel filter screen falls into the slag bucket; at this time, the PLC also instructs the up and down cylinder to descend and the back position cylinder to retract, so as to provide space for the next liquid adding package;

[0007] The slag bucket back position mechanism comprises a magnetic slag bucket back position cylinder arranged on the furnace wall below the automatic opening and closing door filter screen turnover mechanism; a magnetic slag bucket up and down cylinder is arranged at the front end of the slag bucket back position cylinder; a slag bucket back position wheel is arranged at the bottom of the slag bucket up and down cylinder; a slag bucket is arranged at the upper part of the slag bucket up and down cylinder; a screen placing frame proximity switch is arranged on the extension of the slag bucket; the inlet and outlet pipes of the cylinder, the proximity switch and the PLC controller and the pneumatic electromagnetic valve in the control mechanism are connected.

[0008] The control mechanism includes a control cabinet, a hydraulic station and a solenoid valve arranged on one side of the low-pressure furnace, the control cabinet is provided with a pneumatic solenoid valve, a switch power supply for an intelligent identifier, an electric appliance and a PLC controller, a display type programmable drive controller for a servo motor, and the electric contact pressure gauge, the connection line of the intelligent identifier and the switch power supply are connected with the PLC controller, and the PLC controller controls automatic opening and closing of the door of the low-pressure casting machine and automatic overturning of the net rack; when the molten aluminum reaches the low liquid level, the molten aluminum contact table can send a signal to the PLC controller, and the liquid package runs to the front of the holding furnace after receiving the instruction of the holding furnace to add liquid, and the electric contact pressure gauge confirms that the holding furnace has no pressure, and the PLC instructs the solenoid valve of the hydraulic station of the door rotating cylinder to open and close the door rotating cylinder, and the pressure head of the rotating cylinder is away from the automatic opening and closing door, and the intelligent identifier confirms that the position of the liquid package is correct, and the PLC instructs the pneumatic opening and closing door pneumatic solenoid valve to automatically open the liquid door, and when the door proximity switch reaches the upper point of the cylinder, the servo motor driver of the net rack receives the PLC instruction, and the servo motor drives the net rack to automatically overturn into the liquid inlet of the liquid inlet of the net rack, and the liquid package receives the PLC instruction of the liquid inlet position sensor of the net rack, and the liquid is automatically added to the net rack; when the liquid reaches the upper contact point of the molten aluminum contact table, the signal is sent to the PLC, and the PLC instructs the liquid package and the servo driver to stop adding liquid and leave the low-pressure furnace, and the driver instructs the servo motor to drive the net rack to overturn outward (130 degrees) to automatically remove the filter screen;

[0009] The application discloses an intelligent low-pressure holding furnace with an automatically overturned filter screen,

[0010] The application discloses an intelligent low-pressure holding furnace with an automatically overturned filter screen,

[0011] The signal of the liquid touch surface of the aluminum liquid is given to the liquid adding bag to stop adding liquid and drive away from the low-pressure furnace by the PLC instruction. The intelligent identifier confirms that the liquid adding bag leaves, and then instructs the PLC controller. The PLC controller simultaneously gives instructions to the servo driver and the waste net barrel return pneumatic electromagnetic valve and the upper and lower pneumatic cylinder electromagnetic valve. The servo motor is operated to drive the net rack to rotate to the slag removal position away from the liquid adding port. The waste slag barrel return pneumatic cylinder and the upper and lower pneumatic cylinder are extended, and the waste slag barrel is lifted to facilitate waste slag collection.

[0012] The net rack rotates and the front end touches the front end of the waste slag barrel of the extended waste slag barrel. The net rack proximity switch gives a signal to the PLC controller, so that the PLC controller gives an instruction to the door closing pneumatic electromagnetic valve, and the magnetic door closing cylinder on the liquid adding door is extended to close the automatic liquid adding door, so that the waste slag falls into the waste slag barrel. At the same time, the PLC controller gives an instruction to the hydraulic station electromagnetic valve, and the door closing hydraulic station electromagnetic valve around the liquid adding port is opened to pressurize and seal the automatic liquid adding door.

[0013] The net rack is turned over to contact the waste slag barrel proximity switch, and the PLC delay instruction is given to the waste slag barrel upper and lower pneumatic cylinder. After the waste slag net barrel collects the waste slag, the waste slag net barrel is lowered. The proximity switch at the lower end of the waste slag barrel upper and lower pneumatic cylinder simultaneously gives an instruction to the servo driver and the waste slag barrel return pneumatic cylinder, so that the waste slag barrel returns to the original position, and the servo motor is operated to drive the net rack to rotate to the lower wall of the liquid adding port, so as to provide space for the liquid adding bag to drive and enter the next cycle.

[0014] The liquid touch surface of the aluminum liquid is touched to sense the remaining amount of the aluminum liquid, so that the PLC is given an instruction when the aluminum liquid is used to a low liquid level. The signal makes the PLC close the pressurization program of the pressurization process of the casting process, and sends a signal to the transfer bag to add aluminum liquid through the PLC controller, so as to prevent the phenomenon of incomplete casting of the last product and waste of aluminum liquid, reduce the cost of materials and labor, and make the existing low-pressure holding furnace into a low-pressure holding furnace with an automatic turnover filter screen to meet the needs of black lamp production. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a low-pressure holding furnace with an automatic turnover filter screen.

[0016] Figure 2 It is Figure 1 The structure diagram of the servo motor driving the net rack to rotate to the lower wall of the liquid adding port.

[0017] Figure 3 It is Figure 2 The structure diagram of the stainless steel net rack 9 entering the liquid adding port under the action of the multi-angle servo motor after the automatic liquid adding door 7 in the is opened.

[0018] Figure 4 It is Figure 3Structure diagram of the automatic liquid adding door mechanism after the automatic liquid adding door mechanism is closed and the filter residue 10-1 falls into the raised waste residue bucket 11.

[0019] Figure 5 Structure diagram of the stainless steel net rack 9 after the waste residue bucket 11 is lowered.

[0020] Figure 6 Structure diagram of the stainless steel net rack 9 after the waste residue bucket 11 is lowered.

[0021] Figure 7 Structure diagram of the stainless steel net rack 9 after the waste residue bucket 11 is lowered. DETAILED DESCRIPTION

[0022] The specific embodiments in the application will be further described below in combination with the drawings.

[0023] In the drawings, there are a low-pressure holding furnace 1, an electric contact pressure gauge 2, an inclined surface 3, an intelligent recognizer 4, an aluminum liquid contact gauge 5, a liquid adding door 6, a multi-angle servo motor rack 7, a net rack shaft rack 8, a stainless steel net rack 9, a stainless steel net 10, a filter residue 10-1, a waste residue bucket 11, a net rack proximity switch 12, a position sensor rack 13, a magnetic up-down air cylinder 14, a return wheel 15, a heating pipe sealing cover 16, a magnetic return air cylinder 17, a liquid adding port 18, an aluminum liquid contact rod 19, and the like.

[0024] As shown in the drawings, the application provides a low-pressure holding furnace with an automatic turnover filter net, which is characterized by comprising an intelligent detection mechanism, a filter net automatic turnover mechanism, a waste net bucket return mechanism, and a control mechanism.

[0025] The intelligent detection mechanism comprises an electric contact pressure gauge 2, a liquid adding port 18, an aluminum liquid contact gauge 5, an intelligent identifier 4, an aluminum liquid contact rod 19, and a liquid adding door 6. The electric contact pressure gauge 2 is arranged on the heating pipe sealing cover 16 on one side of the low-pressure furnace 1. The liquid adding port 18 is arranged in the inclined surface 3 in front of the low-pressure furnace. The liquid adding door 6 is arranged on the liquid adding port. The aluminum liquid contact gauge 5 and the intelligent identifier 4 are arranged on the inclined surface 3 on one side of the liquid adding port 18. The aluminum liquid contact rod 19 is arranged in the hearth below the aluminum liquid contact gauge 5. The filter screen overturning mechanism is arranged on the inclined angle below the liquid adding port. The filter screen top stripping device is arranged on the door of the automatic opening and closing door filter screen overturning and stripping mechanism. The filter screen automatic screen adding mechanism is arranged on the furnace shell wall below the overturning and stripping mechanism. The waste screen barrel back position mechanism is arranged on the furnace shell wall below the filter screen automatic screen adding mechanism. The control device of the above mechanism is connected with the control mechanism.

[0026] The three aluminum liquid contact rods 19 arranged below the aluminum liquid contact gauge 5 are made of high-purity carbon pipes with stainless steel pipe sleeves. Two of the rods are long and one is short. The length can be adjusted according to the needs. The two long rods are linked with the lower contact points in the aluminum liquid contact gauge 5. The short rod is linked with the upper contact points of the long rods. Signals can be sent to the PLC respectively to display the low and high liquid levels of the aluminum liquid. When the aluminum liquid is used to the low liquid level, the aluminum liquid contact gauge sends a signal to the PLC to instruct the transfer package to automatically drive to the front of the intelligent low-pressure holding furnace to add aluminum liquid.

[0027] The filter screen automatic turnover mechanism, including liquid adding door 6, liquid adding port 18, spinning oil cylinder, open-close door magnetic cylinder, turnover shaft frame 8, servo motor frame 7, multi-angle servo motor with speed reducer, stainless steel screen holder 9, position sensor frame 13, the liquid adding door 6 is arranged on the liquid adding port 18, the open-close door magnetic cylinder with the door opening proximity switch at the upper end and the door closing proximity switch at the lower end is arranged on the fisheye connecting plate on the liquid adding door 6;The closing door spinning oil cylinder is arranged around the liquid adding port 18;The pneumatic electromagnetic valve of the open-close door magnetic cylinder can be connected to the PLC to give the signal of the transfer package to the command requirement line automatically to the front of the intelligent low-pressure holding furnace to add the aluminum liquid, the electromagnetic valve of the closing door spinning oil cylinder around the liquid adding door 6 is opened, the oil cylinder pressure claw leaves the liquid adding door 6, the magnetic piston of the open-close door cylinder retracts the upper end automatic liquid adding door 6, and the door opening proximity switch at the upper end sends a signal to the PLC, the turnover shaft frame 8 is arranged on the inclined angle below the liquid adding port, the two ends of the stainless steel screen holder 9 are linked to the two ends of the turnover shaft in the turnover shaft frame 8, the stainless steel screen 10 is arranged in the stainless steel screen holder 9, the servo motor frame 7 is arranged on the furnace shell at one end of the stainless steel screen holder 9, the multi-angle servo motor with speed reducer is arranged on the servo motor frame 7, the speed reducer output shaft of the servo motor is linked to one end of the stainless steel screen holder 9, the screen holder position sensor frame 13 is arranged on the furnace shell on the other side of the stainless steel screen holder 9, the screen holder reset position sensor, the screen holder liquid inlet position sensor and the screen holder slag removal position sensor are arranged on the position sensor frame 13;When the magnetic piston of the open-close door cylinder retracts the upper end door opening, the proximity switch outside the cylinder sends a signal to the PLC, and the PLC gives an instruction to the display type programmable drive controller of the servo motor, so that the servo motor rotates to the liquid adding port according to the set rotation angle (222 degrees) to drive the stainless steel screen holder 9 to rotate, when the transfer package adds liquid to the aluminum liquid contact surface 5, the signal is sent to the PLC, the PLC instructs the drive system of the servo motor to make the servo motor drive the screen holder to turn outward (130 degrees) to the slag removal position;When the screen holder reaches the slag removal position, the proximity switch 14 sends a signal to the PLC, and the PLC instructs the electromagnetic valve of the open-close door cylinder, and the open-close door cylinder is elongated to close the hydraulic door;

[0028] The waste residue bucket reset mechanism, including magnetic waste residue bucket reset cylinder 17, magnetic waste residue bucket up-down cylinder 14, waste residue bucket reset wheel 15, waste residue bucket 11, screen holder proximity switch 12;The magnetic waste residue bucket reset cylinder 17 is arranged on the furnace wall below the filter screen automatic turnover mechanism, the magnetic waste residue bucket up-down cylinder 14 is arranged at the front end of the waste residue bucket reset cylinder 17, the waste residue bucket reset wheel 17 is arranged at the bottom of the magnetic waste residue bucket up-down cylinder 14, the waste residue bucket 11 is arranged at the upper part of the magnetic waste residue bucket up-down cylinder 14, and the screen holder proximity switch 12 is arranged in front of the extension of the waste residue bucket 11;The inlet and outlet pipes of the above cylinder, the proximity switch and the pneumatic electromagnetic valve in the control mechanism are connected and controlled by the PLC controller.

[0029] The control mechanism comprises a control cabinet, a hydraulic station with a solenoid valve, a pneumatic solenoid valve, a switching power supply, an electric appliance, a PLC controller, a display programmable drive controller for a servo motor; the control cabinet is arranged on one side of the low-pressure furnace, the hydraulic station with a solenoid valve is arranged beside the control cabinet, the pneumatic solenoid valve is arranged in the control cabinet, the switching power supply for the intelligent identifier, the electric appliance, the display programmable drive controller for the servo motor are linked with the PLC controller, and the servo motor is linked with the display programmable drive controller; the connecting lines of the electric contact pressure gauge and the intelligent identifier are connected with the switching power supply and the PLC controller and are arranged in the control cabinet, the PLC controller controls the automatic opening and closing door of the holding furnace of the low-pressure casting machine, and the display programmable drive controller controls the automatic overturning of the net rack; when the aluminum liquid is used to the low liquid level, the aluminum liquid contact table 5 can send a signal to the PLC controller, the liquid adding bag runs in front of the holding furnace after receiving the instruction of adding liquid required by the holding furnace, the electric contact pressure gauge confirms that the holding furnace has no pressure, the PLC instructs the solenoid valve of the hydraulic station of the door opening and closing rotary pressure oil cylinder, so that the pressure head of the rotary pressure oil cylinder is away from the liquid adding door, the intelligent identifier confirms that the position of the liquid adding bag is correct, and then the PLC instructs the automatic liquid adding door 6 to be automatically opened through the pneumatic solenoid valve, the magnetic piston of the door opening and closing cylinder retracts to the upper end, and then the proximity switch instructs the PLC, the servo motor driving system of the net rack receives the instruction of the PLC, and then the servo motor drives the net rack with the filter screen to automatically overturn into the liquid adding opening, the liquid adding bag receives the instruction of the liquid inlet position sensor, and then automatically adds liquid into the net rack; when the liquid adding reaches the upper contact of the aluminum liquid contact table 5, a signal is sent to the PLC, so that the PLC simultaneously instructs the liquid adding bag and the servo driving system to stop adding liquid and leave the low-pressure furnace, and the driving system of the servo motor drives the net rack to overturn outward (130 degrees) to a slag removing position, the outward overturning of the net rack makes the front extension opening press the proximity switch 12 of the net rack, the PLC receives the signal after a time delay (after the filter slag automatically falls into the waste slag barrel), and simultaneously instructs the servo driving system and the pneumatic solenoid valve, so that the up-down air cylinder of the waste slag barrel is lowered, the up-down air cylinder drives the up-down air cylinder with the waste slag barrel and the reset wheel 15 to reset under the contraction of the magnetic waste slag barrel reset air cylinder 17, so as to form a space, the servo motor is driven to rotate the net rack to the lower wall of the liquid adding opening, and the net rack enters the next cycle again;

[0030] The low-pressure holding furnace with an automatically overturned filter screen,

[0031] The low-pressure holding furnace is used for the molten aluminum, and the power contact at the two lower ends of the contact surface is disconnected at the same time, and the input end of the re-casting product is disconnected by the PLC controller, so that the air inlet valve of the low-pressure holding furnace is closed after the product casting is completed, and the exhaust is carried out to the normal pressure, so that the waste phenomenon of incomplete casting of the last product is eliminated; the liquid adding bag is added with the same signal, and after the exhaust is carried out to the pressure table without pressure, the PLC input signal is disconnected, the PLC controller instructs the liquid adding opening around the hydraulic station electromagnetic valve to rotate away from the automatic liquid adding door, the automatic liquid adding door is automatically opened, and the intelligent identifier confirms that the liquid adding bag reaches the correct position, so that the PLC controller instructs the liquid adding door cylinder to retract the automatic liquid adding door, the PLC receives the upper proximity switch signal of the retracting magnetic piston of the opening and closing door cylinder, and then instructs the servo driver, so that the servo motor is operated to drive the net rack to rotate to the liquid adding opening, at this time, the net rack into the liquid adding opening position sensor also sends a signal to the liquid adding bag through the PLC, and the liquid adding bag adds aluminum alloy liquid to the upper contact of the aluminum liquid contact surface;

[0032] The signal of the upper contact of the aluminum liquid contact surface is sent to the liquid adding bag through the PLC, and the liquid adding bag stops adding liquid and leaves the low-pressure furnace, the intelligent identifier confirms that the liquid adding bag leaves, and then instructs the PLC controller, so that the PLC controller instructs the servo driver and the waste net barrel return pneumatic electromagnetic valve and the upper and lower cylinder electromagnetic valve at the same time, the servo motor is operated to drive the net rack to rotate to the deslagging position away from the liquid adding opening, the waste slag barrel return cylinder and the upper and lower cylinder are stretched out, the waste slag barrel 11 is lifted, and the waste slag is collected;

[0033] The net rack rotates, the front end of the net rack touches the front end of the waste slag barrel of the stretched-out upper and lower cylinder, the proximity switch sends a signal to the PLC controller, the PLC controller instructs the closing door pneumatic electromagnetic valve, the magnetic closing cylinder on the liquid adding door is stretched to close the automatic liquid adding door, and the waste slag falls into the waste slag barrel 11; at the same time, the PLC controller instructs the hydraulic station electromagnetic valve, and the automatic liquid adding door is pressurized and sealed by the closing door hydraulic station electromagnetic valve around the liquid adding opening;

[0034] The net rack is turned over to contact the proximity switch of the waste slag barrel, and the PLC delays the instruction to the upper and lower cylinder of the waste slag barrel, so that the waste slag net barrel is lowered after collecting the waste slag, and the proximity switch at the lower end of the upper and lower cylinder of the waste slag barrel sends a signal to the PLC, and the PLC instructs the servo driver and the waste slag barrel return cylinder, so that the waste slag barrel returns, and the servo motor is operated to drive the net rack to rotate to the lower wall of the liquid adding opening, so as to make space for the liquid adding bag to enter the next cycle;

[0035] The liquid aluminum residual amount is touched by the liquid aluminum touch point table, the liquid aluminum is used to the low liquid level, the PLC is given the signal in advance, the signal makes the PLC close the pressurization program of the casting process, and the signal is given to the transfer bag through the PLC controller to add the liquid aluminum, the phenomenon of the last product casting incompletely and the liquid aluminum waste is eliminated, the material and labor cost is reduced, the existing low-pressure holding furnace is made into a low-pressure holding furnace with automatic turnover filter screen, and the demand of black lamp production is met.

[0036] The above description is only used to illustrate the embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement, improvement and the like made by those skilled in the art within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A low pressure holding furnace with an automatic turnover filter screen, characterized in that, Intelligent detection mechanism, filter screen automatic turnover mechanism, waste screen barrel return mechanism, control mechanism are included.

2. The low pressure holding furnace with automatic turnover filter screen according to claim 1, characterized in that, The intelligent detection mechanism comprises an electric contact pressure gauge, a liquid adding port, an aluminum liquid contact gauge, an intelligent identifier, an aluminum liquid contact rod and a liquid adding door; the electric contact pressure gauge is arranged on a heating pipe sealing cover at one side of the low-pressure furnace; the liquid adding port is arranged on an inclined surface in front of the low-pressure furnace; the liquid adding door is arranged on the liquid adding port; the aluminum liquid contact gauge and the intelligent identifier are arranged on an inclined surface at one side of the liquid adding port; the aluminum liquid contact rod is arranged in a hearth below the aluminum liquid contact gauge; the filter screen turnover mechanism is arranged on an inclined angle below the liquid adding port; the filter screen top stripping device is arranged on a door of the automatic opening and closing door filter screen turnover top stripping mechanism; the filter screen automatic screen adding mechanism is arranged on a furnace shell wall below the turnover top stripping mechanism; the waste screen barrel return mechanism is arranged on a furnace shell wall below the filter screen automatic screen adding mechanism; control devices of the above mechanisms are connected with the control mechanism.

3. The low pressure holding furnace with automatic turnover filter screen according to claim 1, characterized in that, The three aluminum liquid contact rods arranged below the aluminum liquid contact gauge are made of high-purity carbon tubes with stainless steel tube sleeves, two long and one short, and the length can be adjusted according to needs; the two long tubes are linked with lower contacts in the aluminum liquid contact gauge, and the short tube is linked with upper contacts in the long tube, which can respectively send signals to PLC to display low and high liquid levels of the aluminum liquid; when the aluminum liquid is used to the low liquid level, the aluminum liquid contact gauge sends signals to the transfer package through PLC to automatically drive the intelligent low-pressure holding furnace to add aluminum liquid.

4. The low pressure holding furnace with automatic turnover filter screen according to claim 1, characterized in that, The filter screen automatic turnover mechanism, comprising a liquid adding door, a liquid adding opening, a rotary pressure oil cylinder, a magnetic cylinder of an opening and closing door, a turnover shaft frame, a servo motor frame, a multi-angle servo motor with a speed reducer, a stainless steel screen placing frame, a position sensor frame, the liquid adding door is arranged on the liquid adding opening, the magnetic cylinder of the opening and closing door with a door opening proximity switch at the upper end and a door closing proximity switch at the lower end is arranged on the fisheye connecting plate of the liquid adding door; the closing door rotary pressure oil cylinder is arranged around the liquid adding opening; the pneumatic electromagnetic valve of the magnetic cylinder of the opening and closing door can receive the signal that the transfer package gives the command requirement line to automatically drive to the front of the intelligent low-pressure holding furnace to add aluminum liquid, and then the electromagnetic valve of the closing door rotary pressure oil cylinder around the liquid adding door is opened, the oil cylinder pressure claw leaves the liquid adding door, the magnetic piston of the opening and closing door cylinder is retracted to the upper end, the door opening proximity switch at the upper end sends a signal to the PLC, the turnover shaft frame is arranged on the inclined angle below the liquid adding opening, the two ends of the stainless steel screen placing frame are linked to the two ends of the turnover shaft in the turnover shaft frame, and the stainless steel screen is arranged in the stainless steel screen placing frame; the servo motor frame is arranged on the furnace shell at one end of the stainless steel screen placing frame, the multi-angle servo motor with a speed reducer is arranged on the servo motor frame, the speed reducer output shaft of the servo motor is linked to one end of the stainless steel screen placing frame, the screen placing frame position sensor frame is arranged on the furnace shell on the other side of the stainless steel screen placing frame, and the screen placing frame return position sensor, the screen placing frame liquid inlet position sensor and the screen placing frame slag removal position sensor are arranged on the position sensor frame; when the magnetic piston of the opening and closing door cylinder retracts to the upper end, the proximity switch outside the cylinder sends a signal to the PLC, the PLC gives a command to the display type programmable drive controller of the servo motor, so that the servo motor rotates to the liquid adding opening according to the set rotation angle (222 degrees) to drive the stainless steel screen placing frame, when the transfer package adds liquid to the aluminum liquid contact surface, a signal is sent to the PLC, the PLC instructs the drive system of the servo motor to drive the servo motor to drive the screen placing frame to turn outward (130 degrees) to the slag removal position; when the screen placing frame reaches the slag removal position, the screen placing frame proximity switch is contacted to send a signal to the PLC, the PLC instructs the electromagnetic valve of the opening and closing door cylinder, and the opening and closing door cylinder is elongated to close the hydraulic door.

5. The low pressure holding furnace with automatic turnover filter screen according to claim 1, characterized in that, The waste residue barrel return mechanism, comprising a magnetic waste residue barrel return cylinder, a magnetic waste residue barrel up and down cylinder, a waste residue barrel return wheel, a waste residue barrel, a screen placing frame proximity switch; the magnetic waste residue barrel return cylinder is arranged on the furnace wall below the filter screen automatic turnover mechanism, the magnetic waste residue barrel up and down cylinder is arranged at the front end of the waste residue barrel return cylinder, the waste residue barrel return wheel is arranged at the bottom of the magnetic waste residue barrel up and down cylinder, the waste residue barrel is arranged at the upper part of the magnetic waste residue barrel up and down cylinder, and the screen placing frame proximity switch is arranged in front of the extension of the waste residue barrel; the inlet and outlet pipes of the above cylinder, the proximity switch and the pneumatic electromagnetic valve in the control mechanism are connected and controlled by the PLC controller.

6. The low pressure holding furnace with automatic turnover filter screen according to claim 1, characterized in that, The control mechanism comprises a control cabinet, a hydraulic station with a solenoid valve, a pneumatic solenoid valve, a switching power supply, an electric appliance, a PLC controller, a display programmable drive controller for a servo motor; the control cabinet is arranged on one side of the low-pressure furnace, the hydraulic station with a solenoid valve is arranged beside the control cabinet, the pneumatic solenoid valve is arranged in the control cabinet, the switching power supply for the intelligent identifier, the electric appliance, the display programmable drive controller for the servo motor are linked with the PLC controller, and the servo motor is linked with the display programmable drive controller; the connecting lines of the electric contact pressure gauge and the intelligent identifier are connected with the switching power supply and the PLC controller and are arranged in the control cabinet, the PLC controller controls automatic opening and closing of the door of the holding furnace of the low-pressure casting machine, and the display programmable drive controller controls automatic overturning of the net rack; when the liquid aluminum reaches a low liquid level, the liquid aluminum contact gauge can send a signal to the PLC controller, the liquid adding bag runs to the front of the holding furnace after receiving an instruction of liquid adding required by the holding furnace, the PLC instructs the solenoid valve of the hydraulic station of the door opening and closing rotary pressure oil cylinder to make the pressure head of the rotary pressure oil cylinder away from the liquid adding door after the electric contact pressure gauge confirms that the holding furnace has no pressure, the intelligent identifier confirms that the liquid adding bag reaches a correct position, and then the PLC instructs the pneumatic solenoid valve of the door opening and closing cylinder to make the automatic liquid adding door automatically open, the proximity switch of the door opening and closing cylinder with a magnetic piston retracts the upper end, and then instructs the PLC, the servo motor drive system of the net rack receives the PLC instruction, and then the servo motor drives the net rack with the filter screen to automatically overturn into the liquid adding opening, the liquid adding bag receives the instruction of the liquid inlet position sensor and then automatically adds liquid into the net rack, when the liquid adding reaches the upper contact point in the liquid aluminum contact gauge, a signal is sent to the PLC, the PLC simultaneously instructs the liquid adding bag and the servo drive system to make the liquid adding bag stop adding liquid and leave the low-pressure furnace, and the drive system of the servo motor drives the net rack to overturn outward (130 degrees) to a slag removing position, the net rack overturning outward makes the front extension contact press the proximity switch of the net rack, the PLC receives a signal after a time delay (after the filter slag automatically falls into the waste slag barrel), and simultaneously instructs the servo drive system and the pneumatic solenoid valve to make the up and down cylinders of the waste slag barrel descend, the up and down cylinders drive the up and down cylinders with the waste slag barrel and the reset wheel to reset under the contraction of the reset cylinder with a magnetic waste slag barrel, so as to make space, the servo motor is driven to rotate the net rack to the lower wall of the liquid adding opening, and the net rack enters the next cycle again.

7. The low pressure holding furnace with automatic turnover filter screen according to claim 1, characterized in that, The application uses the liquid aluminum in the low-pressure holding furnace to disconnect the power contact at the two lower end points of the contact table, and simultaneously disconnects the input end of the re-casting product by the PLC controller, so that the air inlet valve of the low-pressure holding furnace is closed after completing the product casting, and is exhausted to normal pressure, thereby eliminating the waste phenomenon of incomplete casting of the last product; the liquid is added to the liquid adding bag by using the simultaneous signal, and after the exhaust is completed to the pressure table without pressure, the PLC input signal is disconnected, the PLC controller instructs the opening and closing door hydraulic station electromagnetic valve around the liquid adding port to rotate the spinning oil cylinder away from the automatic liquid adding door, the automatic liquid adding door is automatically opened, the intelligent identifier confirms that the liquid adding bag reaches the correct position, the PLC controller instructs the liquid adding door cylinder to retract the automatic liquid adding door to automatically open, the PLC receives the upper proximity switch signal of the retracting magnetic piston of the opening and closing door cylinder, and then instructs the servo driver to make the servo motor run to drive the net rack to rotate the stainless steel filter screen into the liquid adding port, at this time, the net rack into the liquid adding port position sensor also sends a signal to the liquid adding bag through the PLC, and the liquid adding bag adds aluminum alloy liquid into the stainless steel screen until the upper contact of the liquid aluminum contact table; The signal of the upper contact of the liquid aluminum contact table is sent to the liquid adding bag through the PLC to stop adding liquid and leave the low-pressure furnace, the intelligent identifier confirms that the liquid adding bag leaves, and instructs the PLC controller, so that the PLC controller simultaneously instructs the servo driver and the waste screen barrel return pneumatic electromagnetic valve and the upper and lower cylinder electromagnetic valve, instructs the servo motor to run to drive the net rack to rotate to the deslagging position away from the liquid adding port, so that the waste screen barrel return cylinder and the upper and lower cylinder extend, the waste screen barrel 11 is lifted, and the waste slag is collected; The net rack rotates to the front end of the waste screen barrel, and the net rack proximity switch at the front end of the waste screen barrel extends, so that the PLC controller receives the proximity switch signal, instructs the closing door pneumatic electromagnetic valve, makes the magnetic closing door cylinder on the liquid adding door extend to close the automatic liquid adding door, and makes the waste slag fall into the waste screen barrel; at the same time, the PLC controller instructs the hydraulic station electromagnetic valve to open the automatic liquid adding door around the liquid adding port, and pressurizes and seals the automatic liquid adding door; The net rack rotates to contact the waste screen barrel proximity switch, and the PLC delays the instruction to the upper and lower cylinder of the waste screen barrel, so that the waste screen barrel collects the waste slag and then descends, and the proximity switch at the lower end of the upper and lower cylinder of the waste screen barrel simultaneously sends a signal to the servo driver and the waste screen barrel return cylinder, so that the waste screen barrel returns, the servo motor runs to drive the net rack to rotate to the lower wall of the liquid adding port, and the space for the liquid adding bag to travel is formed, so that the next cycle is entered again; The liquid aluminum contact table senses the remaining amount of the liquid aluminum, so that the PLC is instructed in advance when the liquid aluminum is used to a low level, the signal makes the PLC close the pressurization program of the re-pressurizing casting process, and sends a signal to the transfer bag through the PLC controller to add aluminum liquid, thereby eliminating the waste phenomenon of incomplete casting of the last product, reducing the material and labor cost, and making the existing low-pressure holding furnace into a low-pressure holding furnace with an automatic turnover filter screen to meet the needs of black lamp production.

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