A dust removal control system for a hot metal ladle

Abstract

The present invention relates to a dust removal control system for a molten iron ladle, which includes a furnace cover used in conjunction with a furnace body. The furnace cover includes a furnace hood provided at the furnace opening of the furnace body, a furnace cover turning mechanism for driving the turning of the furnace hood, and a furnace cover tightening mechanism. The innovation lies in that it further includes an electrical cabinet and an operating console electrically connected to the electrical cabinet. The electrical cabinet has a power supply module, as well as a driving component action control module, a PLC module, and an external signal control module powered by the power supply module. An angle sensor for detecting the opening and closing angle of the furnace hood is provided on the outer side of the telescopic arm, and the angle sensor is electrically connected to the corresponding connection terminal of the PLC module. The driving component action control module includes an electric actuator, a two-position six-way valve for realizing oil circuit switching, and an on-off solenoid valve for controlling the on-off of the oil circuit of the hydraulic system. The present invention can achieve multi-point detection and linkage reaction under different working conditions, greatly improving the safety operation and ensuring the control accuracy.

Description

Technical Field

[0001] The present invention relates to a control system, and more particularly to a molten iron ladle dust removal control system. Background Art

[0002] The existing intermediate frequency furnace mouth is the main source of dust and gas emission. A large amount of dust and gas will also be generated during the process of the molten iron ladle. Therefore, it is necessary to collect the dust and gas emitted from the furnace mouth and the dust and gas generated during the process of the molten iron ladle and remove the dust, which plays an important role in improving the working environment and reducing the pollution of dust to the atmosphere.

[0003] Currently, a dust collection device (furnace cover) is added and used in combination with the intermediate frequency furnace. The dust and gas generated by the intermediate frequency furnace are captured by the furnace hood in the furnace cover structure, and the captured flue gas is sent into the dust removal equipment for dust removal and then discharged. In the existing technology, an air volume regulating valve is provided on the pipeline connecting the telescopic pipe of the dust collection device and the dust removal equipment. The molten iron ladle dust removal control system has a simple structure and only collects the signal of whether the molten iron is tapped. That is, during the melting process, the control system controls the air volume regulating valve to be in the closed state to prevent the dust removal equipment from sucking away the heat during the melting process, which not only causes waste of electric energy but also affects the melting efficiency. During the tapping process, according to the amount of flue gas generated during the molten iron ladle, the control system controls the opening size of the air volume regulating valve to implement flue gas capture. It can be seen that the molten iron ladle dust removal system in the existing technology can only play a role during the tapping of molten iron, and the detection points are single. If the signal acquisition sends a wrong signal, it may cause misoperation of the equipment, greatly reducing the safety of equipment operation. At the same time, this control system cannot have highly safe operations in working states such as charging, ladling, slag skimming, and maintenance, making the risk coefficient of the ladling work relatively large. Summary of the Invention

[0004] The object of the present invention is to provide a molten iron ladle dust removal control system that can achieve multi-point detection and linkage reaction in different working states, greatly improving the safety operation and ensuring the control accuracy.

[0005] To achieve the above object, the technical solution of the present invention is: a molten iron ladle dust removal control system, including a furnace cover used in combination with a furnace body, the furnace cover includes a furnace hood arranged at the furnace mouth of the furnace body, a furnace cover flipping mechanism, and a furnace cover tightening mechanism, and the furnace hood further has an extension hood connected to its pipeline.

[0006] The cover flipping mechanism is arranged on one side of the furnace body and is used to drive the flipping of the furnace hood. The cover flipping mechanism includes a boom, a telescopic arm communicated with the dust removal pipe of the dust removal equipment, and two oil cylinders for driving the actions of the furnace hood and the boom respectively. One side of the telescopic arm is rotatably connected to the dust removal pipe, and the other side is rotatably connected to one side of the boom. The furnace hood is rotatably connected to the other side of the boom. The two oil cylinders realize oil circuit control through a set of hydraulic systems.

[0007] The cover tensioning mechanism includes a safety pin cylinder and a tensioning beam. The tensioning beam surrounds a part of the outer circumference of the furnace hood. One end of the tensioning beam is rotatably connected to the furnace body, and the other end is fixedly connected to the boom. Safety pin cylinders for locking the furnace hood are respectively arranged on both sides of the furnace body and on the furnace hood. When the ejector rod of the safety pin cylinder acts, it can be positioned and inserted into the tensioning beam.

[0008] The innovation lies in that it further includes an electrical cabinet and an operating platform electrically connected to the electrical cabinet.

[0009] The electrical cabinet is provided with a power supply module, a driving component action control module, a PLC module, and an external signal control module powered by the power supply module.

[0010] An angle sensor for detecting the opening and closing angle of the furnace hood is arranged on the outer side of the telescopic arm, and the angle sensor is electrically connected to the corresponding connection end of the PLC module.

[0011] The driving component action control module includes an electric actuator, a two-position six-way valve for realizing oil circuit switching, and a on-off solenoid valve for controlling the on-off of the oil circuit of the hydraulic system. An air volume regulating valve is arranged on the pipeline connecting the furnace hood and the extension hood, and an electric actuator for controlling the action of the air volume regulating valve is arranged on the air volume regulating valve. The two-position six-way valve and the on-off solenoid valve are connected in series on the oil circuit of the hydraulic system. The two oil cylinders are respectively connected to the corresponding valve ports of the two-position six-way valve. The electric actuator, the two-position six-way valve, and the on-off solenoid valve are respectively electrically connected to the corresponding connection ends of the PLC module.

[0012] The external signal control module includes a furnace hood manual solenoid valve, a limit switch, and a magnetic switch. A limit switch is arranged on the tensioning beam and close to the safety pin cylinder. Two groups of magnetic switches are arranged on the safety pin cylinder. The furnace hood manual solenoid valve, the limit switch, and the magnetic switch are respectively electrically connected to the corresponding connection ends of the PLC module.

[0013] In the above technical solution, the operating platform is powered by the power supply module. The operating platform has a three-position switch for manually controlling the action of the electric actuator, a two-position switch for manually controlling the safety pin cylinder, a manual-automatic conversion switch, an emergency stop switch, and a rotary switch for controlling the action of the oil cylinder. The three-position switch, the two-position switch, the manual-automatic conversion switch, the emergency stop switch, and the rotary switch are respectively electrically connected to the corresponding connection ends of the PLC module.

[0014] In the above technical solution, the driving component action control module further includes a status indicator light for whether the air cylinder can act and a plurality of intermediate relays for isolating signals. The safety pin air cylinder has an air cylinder solenoid valve. The electric actuator, the two-position six-way valve, and the on-off solenoid valve are respectively electrically connected to corresponding connection terminals of the PLC module through corresponding intermediate relays. The air cylinder solenoid valve for controlling the movement of the ejector rod of the safety pin air cylinder is electrically connected to the corresponding connection terminal of the PLC module through a corresponding intermediate relay. The PLC module outputs an electrical signal for detecting whether the air cylinder is ventilated during operation, and this electrical signal is electrically connected to the status indicator light for whether the air cylinder can act through a corresponding intermediate relay.

[0015] In the above technical solution, the external signal control module further includes a plurality of intermediate relays for signal isolation. The hood manual solenoid valve, the limit switch, and two groups of magnetic switches are respectively electrically connected to corresponding connection terminals of the PLC module through corresponding intermediate relays.

[0016] In the above technical solution, the external signal control module further includes a furnace body proximity switch. The furnace body proximity switch is arranged at the bottom of the furnace body, and the furnace body proximity switch is electrically connected to the corresponding connection terminal of the PLC module through a corresponding intermediate relay.

[0017] In the above technical solution, the electrical cabinet further includes an external signal output indication module including a plurality of indicator lights. Corresponding indicator lights are provided on the branches where the electric actuator, the limit switch, and two groups of magnetic switches are respectively electrically connected to the PLC module.

[0018] In the above technical solution, the hood manual solenoid valve is of a mechanical lever structure.

[0019] In the above technical solution, the external signal control module further includes a sensor proximity switch that forms an interlock structure with the hood manual solenoid valve. The sensor proximity switch is electrically connected to the corresponding connection terminal of the PLC module through a corresponding intermediate relay. When the sensor proximity switch outputs a signal, the hood manual solenoid valve will act.

[0020] In the above technical solution, the three-position switch, the two-position switch, the manual / automatic transfer switch, and the emergency stop switch are all rotary switches.

[0021] The positive effect of the present invention is that after adopting the molten iron ladle dust removal control system of the present invention, since the present invention further includes an electrical cabinet and an operating platform electrically connected to the electrical cabinet,

[0022] The electrical cabinet is provided with a power supply module, as well as a driving component action control module, a PLC module, and an external signal control module powered by the power supply module.

[0023] An angle sensor for detecting the opening and closing angle of the furnace hood is provided on the outer side of the telescopic arm, and the angle sensor is electrically connected to the corresponding connection terminal of the PLC module.

[0024] The driving component action control module includes an electric actuator, a two-position six-way valve for realizing oil circuit switching, and a on-off solenoid valve for controlling the on-off of the oil circuit of the hydraulic system. A air volume regulating valve is provided on the pipeline connecting the furnace hood and the extension hood, and an electric actuator for controlling the action of the air volume regulating valve is provided on the air volume regulating valve. The two-position six-way valve and the on-off solenoid valve are connected in series on the oil circuit of the hydraulic system. The two oil cylinders are respectively connected to the corresponding valve ports of the two-position six-way valve. The electric actuator, the two-position six-way valve and the on-off solenoid valve are respectively electrically connected to the corresponding connection terminals of the PLC module.

[0025] The external signal control module includes a furnace hood manual solenoid valve, a limit switch and a magnetic switch. A limit switch is provided on the tension beam near the safety pin cylinder, and two groups of magnetic switches are provided on the safety pin cylinder. The furnace hood manual solenoid valve, the limit switch and the magnetic switch are respectively electrically connected to the corresponding connection terminals of the PLC module.

[0026] When the furnace body is in the normal (initial) state, the furnace cover is in the closed state. The angle detected by the angle sensor at this time is less than 10°. The PLC module detects that the signal of the limit switch is 1. At this time, the magnetic switch outputs a corresponding electrical signal to the PLC module. The PLC module controls the ejector rod of the safety pin cylinder to eject and insert into the corresponding jack on the tension beam. At the same time, the PLC module detects that both the opening signal and the closing signal of the electric actuator are 1.

[0027] When feeding, the furnace hood manual solenoid valve is controlled to act. The PLC module outputs a control signal to control the retraction of the ejector rod of the safety pin cylinder. At this time, the PLC module detects that the output signal of the magnetic switch is 1. The two-position six-way valve is connected to the oil cylinder for controlling the movement of the boom, and controls the movement of the boom to open the boom. If the signal output by any one of the magnetic switches cannot be detected, the on-off solenoid valve is in the power-off state, and the furnace hood cannot move. When the furnace hood is lifted (opened), the signal of the limit switch is detected by the PLC module as 0. The angle sensor will detect an increasing angle as the boom rises and send the changing electrical signal to the PLC module.

[0028] When pouring molten iron, the furnace body needs to tilt forward by 95°. Therefore, the boom and telescopic arm need to return to their initial positions (normal state) first, and the furnace body and the furnace hood are interlocked. If the PLC module fails to detect the signal that the safety pin cylinder is inserted into the jack of the tension beam, that is, the furnace hood is not interlocked with the furnace body as a whole, the furnace body cannot tilt at this time. This is to ensure that the furnace hood can flip synchronously with the furnace body, and the furnace hood will not tip over due to its own heavy weight and only one connection point. To improve the capture effect of flue gas during molten iron pouring, an air volume regulating valve and an electric actuator for controlling the action of the air volume regulating valve are added to the pipeline connecting the furnace hood and the extension hood. The electric actuator will output corresponding signals to the PLC module, and the PLC module will adjust the output air volume of the air volume regulating valve by controlling the working state of the electric actuator to ensure the flue gas capture effect of the furnace hood;

[0029] When slagging, the furnace body needs to tilt backward by 30°. Manipulate the manual solenoid valve of the furnace hood to act again. The PLC module outputs a control signal to control the ejector rod of the safety pin cylinder to retract. At this time, the output signal of the magnetic switch detected by the PLC module is 1. The two-position six-way valve is connected to the oil cylinder controlling the boom movement to control the boom movement and open the boom. The furnace hood opens 30° relative to the furnace body, facilitating the staff to slag;

[0030] When overhauling, the PLC module outputs a control signal to control the ejector rod of the safety pin cylinder to retract. At this time, the output signal of the magnetic switch detected by the PLC module is 1. The two-position six-way valve is connected to the oil cylinder controlling the telescopic arm movement to realize oil circuit switching and control the telescopic arm movement, so that the furnace hood opens about 90°, facilitating the staff to carry out overhaul work.

[0031] The opening and closing angle of the furnace hood of the present invention is detected by an angle sensor, which can ensure that the valve orifice of the air volume regulating valve can be adjusted arbitrarily. The present invention realizes double protection for the hydraulic system through a two-position flow valve and a on-off solenoid valve. The present invention can control the furnace body and the furnace hood to be interlocked as a whole during the molten iron pouring process to prevent the furnace hood from tipping over. At the same time, the present invention can be safely manipulated in different working states, that is, the manipulation in each working state requires multi-point detection and linkage reaction before it can act, greatly improving the operation safety. That is to say, the present invention ensures that the action of each driving component needs to be coordinated and matched with its corresponding detection signal before it can be realized, solving the problem that a single detection point in the existing technology will send out wrong signals, resulting in misoperation of the equipment. The present invention can ensure the accuracy of control. Description of the Drawings

[0032] Figure 1 is a schematic structural diagram of a specific embodiment of the present invention;

[0033] Figure 2 is Figure 1Right side view;

[0034] Figure 3 is the electrical schematic diagram of the power module inside the electrical cabinet of the present invention;

[0035] Figure 4 is the electrical schematic diagram of the operating platform of the present invention;

[0036] Figure 5 is the electrical schematic diagram of the driving component action control module inside the electrical cabinet of the present invention;

[0037] Figure 6 is the electrical schematic diagram of the external signal control module inside the electrical cabinet of the present invention;

[0038] Figure 7 is the electrical schematic diagram of the external signal output indication module inside the electrical cabinet of the present invention;

[0039] Figure 8 is the electrical schematic diagram of the first part of the PLC module inside the electrical cabinet of the present invention;

[0040] Figure 9 is the electrical schematic diagram of the second part of the PLC module inside the electrical cabinet of the present invention;

[0041] Figure 10 is the electrical schematic diagram of the third part of the PLC module inside the electrical cabinet of the present invention. Detailed implementation manners

[0042] The present invention will be further described below in conjunction with the accompanying drawings and the given embodiments, but is not limited thereto.

[0043] As Figure 1 , 2 , 3, 4, 5, 6, 7, 8, 9, 10 show, a hot metal ladle dust removal control system includes a furnace cover used in conjunction with a furnace body. The furnace cover includes a furnace hood 2 provided at the furnace mouth of the furnace body 1, a furnace cover flipping mechanism 3, and a furnace cover tensioning mechanism 4. The furnace hood 2 further has an extension hood 21 connected to its pipeline.

[0044] The furnace cover flipping mechanism 3 is provided on one side of the furnace body 1 and is used to drive the flipping of the furnace hood 2. The furnace cover flipping mechanism 3 includes a boom 32 and a telescopic arm 31 connected to the dust removal pipe of the dust removal equipment, and two oil cylinders 34 respectively driving the actions of the furnace hood 2 and the boom 32. One side of the telescopic arm 31 is rotatably connected to the dust removal pipe, and the other side is rotatably connected to one side of the boom 32. The furnace hood 2 is rotatably connected to the other side of the boom 32. The piston of one oil cylinder 34 is fixedly connected to the boom 32, and the piston of the other oil cylinder 34 is fixedly connected to the furnace hood 2. The two oil cylinders 34 realize oil circuit control through a set of hydraulic systems.

[0045] The furnace cover tightening mechanism 4 includes a safety pin cylinder 41 and a tightening beam 42. The tightening beam 42 surrounds a part of the outer circumference of the furnace hood 2. One end of the tightening beam 42 is rotatably connected to the furnace body 1, and the other end is fixedly connected to the boom 32. On the furnace body 1 and on both sides of the furnace hood 2, safety pin cylinders 41 for locking the furnace hood 2 are respectively provided. When the ejector rod of the safety pin cylinder 41 acts, it can be positioned and inserted into the tightening beam 42.

[0046] It further includes an electrical cabinet 7 and an operating console 5 electrically connected to the electrical cabinet 7.

[0047] Inside the electrical cabinet, there is a power supply module 71, as well as a driving component action control module 72, a PLC module 73, and an external signal control module 74 powered by the power supply module 71.

[0048] An angle sensor 33 for detecting the opening and closing angle of the furnace hood 2 is provided on the outer side of the telescopic arm 31, and the angle sensor 33 is electrically connected to the corresponding connection terminal of the PLC module 73.

[0049] The driving component action control module 72 includes an electric actuator 721, a two-position six-way valve 722 for realizing oil circuit switching, and a on-off solenoid valve 723 for controlling the on-off of the oil circuit of the hydraulic system. A air volume regulating valve is provided on the pipeline connecting the furnace hood 2 and the extension hood 21, and an electric actuator 721 for controlling the action of the air volume regulating valve is provided on the air volume regulating valve. The two-position six-way valve 722 and the on-off solenoid valve 723 are connected in series on the oil circuit of the hydraulic system. The two oil cylinders 34 are respectively connected to the corresponding valve ports of the two-position six-way valve 722. The electric actuator 721, the two-position six-way valve 722, and the on-off solenoid valve 723 are respectively electrically connected to the corresponding connection terminals of the PLC module 73.

[0050] The external signal control module 74 includes a furnace hood manual solenoid valve 741, a limit switch 742, and a magnetic switch 743. A limit switch 742 is provided on the tightening beam 42 near the safety pin cylinder 41. Two groups of magnetic switches 743 are provided on the safety pin cylinder 41. The furnace hood manual solenoid valve 741, the limit switch 742, and the magnetic switch 743 are respectively electrically connected to the corresponding connection terminals of the PLC module 73.

[0051] As Figure 3 shown, it is the power supply module 71 in the electrical cabinet 7 of the present invention. The input end of the air switch included in the power supply module 71 is connected to the municipal power supply, and the output end of the air switch is connected to the input end of the AC-DC conversion chip. The output end of the AC-DC conversion chip outputs different DC working voltages to provide power for different modules.

[0052] As Figure 4As shown in the figure, in order to achieve manual control and / or automatic control of the driving component, the operation console 5 is powered by a power module 71. The operation console 5 has a three-position switch 51 for manually controlling the action of the electric actuator 721, a two-position switch 52 for manually controlling the safety pin cylinder 41, a manual / automatic transfer switch 53, an emergency stop switch 54, and a rotary switch 55 for controlling the action of the oil cylinder 34. The three-position switch 51, the two-position switch 52, the manual / automatic transfer switch 53, the emergency stop switch 54, and the rotary switch 55 are respectively electrically connected to the corresponding connection terminals of the PLC module 73. The specific usage process is as follows: When different manual switches are rotated, the electric actuator 721, the safety pin cylinder 41, and the oil cylinder 34 can be manually controlled respectively. If the manual / automatic transfer switch 53 is operated, the automatic coordinated operation of the furnace cover and the furnace body can be achieved, realizing the integration of manual and automatic control.

[0053] As Figure 5 As shown in the figure, in order to highlight whether the cylinder can act and isolate different signals to ensure that different driving components and the corresponding connected intermediate relays form a linkage reaction, the driving component action control module 72 further includes a status indicator light 724 for indicating whether the cylinder can act and multiple intermediate relays for isolating signals. The safety pin cylinder 41 has a cylinder solenoid valve 411. The electric actuator 721, the two-position six-way valve 722, and the on-off solenoid valve 723 are respectively electrically connected to the corresponding connection terminals of the PLC module 73 through the corresponding intermediate relays. The cylinder solenoid valve 411 for controlling the action of the ejector rod of the safety pin cylinder 41 is electrically connected to the corresponding connection terminal of the PLC module 73 through the corresponding intermediate relay. The PLC module 73 outputs an electrical signal for detecting whether the cylinder is ventilated during operation, and this electrical signal is electrically connected to the status indicator light 724 for indicating whether the cylinder can act through the corresponding intermediate relay. The specific process is as follows: When the ejector rod of the safety pin cylinder 41 acts, the PLC module 73 outputs an electrical signal for detecting whether the cylinder is ventilated during operation, and the normally open contact of the intermediate relay on this branch gets energized. The status indicator light 724 for indicating whether the cylinder can act lights up. At this time, the PLC module 73 outputs a corresponding electrical signal to make the normally open contact of the intermediate relay connected to the cylinder solenoid valve get energized, controlling the cylinder solenoid valve 411 to conduct.

[0054] As Figure 6As shown, in order to ensure that external signals can form a linkage reaction with the corresponding connected intermediate relays, so that interference (interference) does not occur between different external signals and misoperations do not occur, the external signal control module 74 further includes a plurality of intermediate relays used for signal isolation. The hood manual solenoid valve 741, the limit switch 742, and the two groups of magnetic switches 743 are respectively electrically connected to the corresponding connection terminals of the PLC module 73 through the corresponding intermediate relays. The specific process is as follows: The hood manual solenoid valve 741, the limit switch 742, and the two groups of magnetic switches 743 respectively output corresponding signals. At the same time, the normally open contacts of the intermediate relays corresponding to them need to be energized simultaneously in order to achieve signal intercommunication with the PLC module.

[0055] As Figure 6 shown, in order to detect the current state of the furnace body, the external signal control module 74 further includes a furnace body proximity switch 745. The furnace body proximity switch 745 is provided at the bottom of the furnace body 1, and the furnace body proximity switch 745 is electrically connected to the corresponding connection terminals of the PLC module 73 through the corresponding intermediate relay. That is, when the furnace body is in the normal (initial) state, the electrical signal output by the furnace body proximity switch 745 is detected as 1 by the PLC module. When the furnace body is tilted (ladle or slag skimming), the angle detected by the angle sensor becomes larger, and the electrical signal output by the furnace body proximity switch 745 is detected as 0 by the PLC module.

[0056] As Figure 7 shown, in order to more intuitively see the states of different components, the electrical cabinet further includes an external signal output indication module 75 including a plurality of indicator lights. Corresponding indicator lights are provided on the branches where the electric actuator 721, the limit switch 742, and the two groups of magnetic switches 743 are respectively electrically connected to the PLC module 73.

[0057] For the convenience of manual operation, further, the hood manual solenoid valve 741 of the present invention is a mechanical lever structure.

[0058] As Figure 7 shown, in order to prevent misoperation of the hood manual solenoid valve, the external signal control module 74 further includes a sensor proximity switch 746 that forms an interlock structure with the hood manual solenoid valve 741. The sensor proximity switch 746 is electrically connected to the corresponding connection terminals of the PLC module 73 through the corresponding intermediate relay. The hood manual solenoid valve 741 will only act when the sensor proximity switch 746 outputs a signal. That is to say, when the hood manual solenoid valve 741 is manipulated, at the same time, the sensor proximity switch 746 detects the corresponding electrical signal and sends it to the PLC module, and the PLC module can output the corresponding control signal to control the on-off of the solenoid valve and the two-position six-way valve.

[0059] Further, the three-position switch 51, two-position switch 52, manual-automatic transfer switch 53 and emergency stop switch 54 of the present invention are all rotary switches.

[0060] The PLC module 73 of the present invention is composed of three parts, as shown in Figure 8 , 9 , 10. The connection relationships of the various modules of the present invention are reflected by the labels marked on the leads.

[0061] The working process of the present invention: When the furnace body is in the normal (initial) state, the furnace cover is in the closed state. At this time, the angle detected by the angle sensor 33 is less than 10°. The PLC module 73 detects that the signal of the limit switch 742 is 1. At this time, the magnetic switch 743 outputs a corresponding electrical signal to the PLC module 73. The PLC module 73 controls the ejector rod of the safety pin cylinder 41 to eject and insert into the corresponding jack on the tension beam 42. At the same time, the PLC module 73 detects that both the opening signal and the closing signal of the electric actuator 721 are 1;

[0062] When feeding materials, the manual electromagnetic valve 741 of the furnace hood is controlled to act. The PLC module 73 outputs a control signal to control the ejector rod of the safety pin cylinder 41 to retract. At this time, the PLC module 73 detects that the output signal of the magnetic switch 743 is 1. The two-position six-way valve 722 is communicated with the oil cylinder 34 that controls the movement of the boom 32, and controls the movement of the boom 32 to open the boom 32. If the output signal of any one of the magnetic switches 743 cannot be detected, the on-off solenoid valve 723 is in the power-off state, and the furnace hood 2 cannot act. When the furnace hood 2 is lifted (opened), the signal of the limit switch 742 is detected as 0 by the PLC module 73. The angle sensor 33 will detect an increasing angle as the boom 32 rises and send the changing electrical signal to the PLC module 73;

[0063] When pouring molten iron, the furnace body 1 needs to tilt forward by 95°. Therefore, the boom 32 and the telescopic arm 31 need to first return to the initial position (normal state), and the furnace body 1 and the furnace hood 2 are interlocked. If the PLC module 73 cannot detect the signal that the safety pin cylinder 41 is inserted into the jack of the tension beam 42, that is, the furnace hood 2 is not interlocked with the furnace body 1 as a whole, at this time the furnace body 1 cannot tilt. This is to ensure that the furnace hood 2 can flip synchronously with the furnace body 1, and the furnace hood 2 will not tip over due to its own heavy weight and only one connection point. In order to improve the capture effect of the flue gas when pouring molten iron, a air volume regulating valve and an electric actuator 721 that controls the action of the air volume regulating valve are added to the pipeline connecting the furnace hood 2 and the extension hood 21. The electric actuator 721 will output a corresponding signal to the PLC module 73, and the PLC module 73 will adjust the output air volume of the air volume regulating valve by controlling the working state of the electric actuator 721 to ensure the capture effect of the flue gas by the furnace hood 2;

[0064] When slagging, the furnace body 1 needs to tilt backward by 30°. Then, operate the manual solenoid valve 741 of the furnace hood again. The PLC module 73 outputs a control signal to control the ejector rod of the safety pin cylinder 41 to retract. At this time, the output signal of the magnetic switch detected by the PLC module 73 is 1. The two-position six-way valve 722 is connected to the oil cylinder 34 that controls the movement of the boom 32, and controls the movement of the boom 32 to open the boom 32. The furnace hood 2 opens 30° relative to the furnace body 1 and is parallel to the horizontal direction, facilitating the staff to slag.

[0065] When overhauling, the PLC module 73 outputs a control signal to control the ejector rod of the safety pin cylinder 41 to retract. At this time, the output signal of the magnetic switch 743 detected by the PLC module 73 is 1. The two-position six-way valve 722 is connected to the oil cylinder 34 that controls the movement of the telescopic arm 31, realizing oil circuit switching and controlling the movement of the telescopic arm 31 to open the furnace hood 2 to about 90°, facilitating the staff to carry out overhaul work.

[0066] The opening and closing angle of the furnace hood of the present invention is detected by an angle sensor, which can ensure that the valve orifice of the air volume regulating valve can be adjusted arbitrarily. The present invention realizes double protection for the hydraulic system through a two-position flow valve and a on-off solenoid valve. The present invention can control the furnace body and the furnace hood to be interlocked as a whole during the process of pouring molten iron, preventing the furnace hood from tipping over. At the same time, the present invention can be safely operated under different working states, that is, the operation under each working state requires multi-point detection and linkage reaction to act, greatly improving the operation safety. That is to say, the present invention ensures that the action of each driving component needs to be coordinated and matched with its corresponding detection signal to be realized, solving the problem that a single detection point in the prior art will send out wrong signals, resulting in misoperation of the equipment. The present invention can ensure the accuracy of control.

[0067] Taking the ideal embodiment based on the present invention as an inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A molten iron ladle dust removal control system, including a furnace cover used in conjunction with a furnace body. The furnace cover includes a furnace hood (2) provided at the furnace mouth of the furnace body (1), a furnace cover flipping mechanism (3), and a furnace cover tightening mechanism (4). The furnace hood (2) also has an extension hood (21) connected to it through a pipeline. The furnace cover flipping mechanism (3) is provided on one side of the furnace body (1) and is used to drive the flipping of the furnace hood (2). The furnace cover flipping mechanism (3) includes a boom (32) and a telescopic arm (31) connected to the dust removal pipe of the dust removal equipment, and two oil cylinders (34) that respectively drive the actions of the furnace hood (2) and the boom (32). One side of the telescopic arm (31) is rotatably connected to the dust removal pipe, and the other side is rotatably connected to one side of the boom (32). The furnace hood (2) is rotatably connected to the other side of the boom (32). The two oil cylinders (34) realize oil circuit control through a set of hydraulic systems. The furnace cover tightening mechanism (4) includes a safety pin cylinder (41) and a tightening beam (42). The tightening beam (42) surrounds a part of the outer circumference of the furnace hood (2). One end of the tightening beam (42) is rotatably connected to the furnace body (1), and the other end is fixedly connected to the boom (32). On the furnace body (1) and on both sides of the furnace hood (2), safety pin cylinders (41) for locking the furnace hood (2) are respectively provided. When the ejector rod of the safety pin cylinder (41) moves, it can be positioned and inserted into the tightening beam (42). It is characterized in that: It also includes an electrical cabinet (7) and an operating platform (5) electrically connected to the electrical cabinet (7). The electrical cabinet has a power supply module (71), and a driving component action control module (72), a PLC module (73), and an external signal control module (74) powered by the power supply module (71). An angle sensor (33) for detecting the opening and closing angle of the furnace hood (2) is provided on the outer side of the telescopic arm (31), and the angle sensor (33) is electrically connected to the corresponding connection terminal of the PLC module (73). The driving component action control module (72) includes an electric actuator (721), a two-position six-way valve (722) for realizing oil circuit switching, and a on-off solenoid valve (723) for controlling the on-off of the oil circuit of the hydraulic system. A air volume regulating valve is provided on the pipeline connecting the furnace hood (2) and the extension hood (21), and an electric actuator (721) for controlling the action of the air volume regulating valve is provided on the air volume regulating valve. The two-position six-way valve (722) and the on-off solenoid valve (723) are connected in series on the oil circuit of the hydraulic system. The two oil cylinders (34) are respectively connected to the corresponding valve ports of the two-position six-way valve (722). The electric actuator (721), the two-position six-way valve (722), and the on-off solenoid valve (723) are respectively electrically connected to the corresponding connection terminals of the PLC module (73). The external signal control module (74) includes a hood manual solenoid valve (741), a limit switch (742), and a magnetic switch (743). A limit switch (742) is provided on the tension beam (42) near the safety pin cylinder (41). Two groups of magnetic switches (743) are provided on the safety pin cylinder (41). The hood manual solenoid valve (741), the limit switch (742), and the magnetic switch (743) are electrically connected to corresponding connection terminals of the PLC module (73) respectively. The external signal control module (74) further includes multiple intermediate relays for signal isolation. The hood manual solenoid valve (741), the limit switch (742), and the two groups of magnetic switches (743) are electrically connected to corresponding connection terminals of the PLC module (73) through corresponding intermediate relays respectively. The hood manual solenoid valve (741), the limit switch (742), and the two groups of magnetic switches (743) output corresponding signals. At the same time, the normally open contacts of the intermediate relays connected to them need to be energized simultaneously to achieve signal intercommunication with the PLC module (73). The external signal control module (74) further includes a furnace body proximity switch (745). The furnace body proximity switch (745) is provided at the bottom of the furnace body (1), and the furnace body proximity switch (745) is electrically connected to a corresponding connection terminal of the PLC module (73) through a corresponding intermediate relay.

2. The molten iron ladle dust removal control system according to claim 1, wherein: The operation console (5) is powered by a power supply module (71). The operation console (5) has a three-position switch (51) for manually controlling the action of the electric actuator (721), a two-position switch (52) for manually controlling the safety pin cylinder (41), a manual / automatic transfer switch (53), an emergency stop switch (54), and a rotary switch (55) for controlling the action of the oil cylinder (34). The three-position switch (51), the two-position switch (52), the manual / automatic transfer switch (53), the emergency stop switch (54), and the rotary switch (55) are electrically connected to corresponding connection terminals of the PLC module (73) respectively.

3. The molten iron ladle dust removal control system according to claim 1, characterized in that: The driving component action control module (72) further includes a status indicator light (724) for indicating whether the cylinder can act and multiple intermediate relays for signal isolation. The safety pin cylinder (41) has a cylinder solenoid valve (411). The electric actuator (721), the two-position six-way valve (722), and the on-off solenoid valve (723) are electrically connected to corresponding connection terminals of the PLC module (73) through corresponding intermediate relays respectively. The cylinder solenoid valve (411) for controlling the movement of the push rod of the safety pin cylinder (41) is electrically connected to a corresponding connection terminal of the PLC module (73) through a corresponding intermediate relay. The PLC module (73) outputs an electrical signal for detecting whether the cylinder is ventilated during operation, and this electrical signal is electrically connected to the status indicator light (724) for indicating whether the cylinder can act through a corresponding intermediate relay.

4. The hot metal ladle dust removal control system according to claim 1, characterized in that: The electrical cabinet further includes an external signal output indication module (75) which includes a plurality of indicator lights (751). Corresponding indicator lights (751) are provided on the branches where the electric actuator (721), the limit switch (742) and the two groups of magnetic switches (743) are electrically connected to the PLC module (73) respectively.

5. The molten iron ladle dust removal control system according to claim 1, characterized in that: The hood manual solenoid valve (741) is of a mechanical lever structure.

6. The molten iron ladle dust removal control system according to claim 1, wherein: The external signal control module (74) further includes a sensor proximity switch (746) which forms an interlock structure with the hood manual solenoid valve (741). The sensor proximity switch (746) is electrically connected to the corresponding connection terminal of the PLC module (73) through a corresponding intermediate relay. The hood manual solenoid valve (741) will operate only when the sensor proximity switch (746) outputs a signal.

7. The molten iron ladle dust removal control system according to claim 2, wherein: The three-position switch (51), the two-position switch (52), the manual / automatic changeover switch (53) and the emergency stop switch (54) are all rotary switches.

Images