Flue gas removal system for chute of holding furnace

Abstract

The utility model discloses a mixing furnace chute smoke removal system which comprises a smoke collection system and an induction detection device, the smoke collection system comprises a negative pressure dust remover, an air inlet of the negative pressure dust remover is connected with one end of a negative pressure smoke exhaust pipe, and a smoke collection cover is arranged on one side of a mixing furnace chute and communicated with the negative pressure smoke exhaust pipe through a pipeline; the induction detection device comprises a trigger switch mechanism, an electric control valve and a controller, the electric control valve is arranged on the pipeline, the trigger switch mechanism comprises a feeler lever, the end of an L-shaped rod is fixed to the bottom plate and an ellipsoid, a through groove is formed in the feeler lever, and the ellipsoid is sleeved with the through groove; a spring is arranged at one end of the feeler lever and fixes a circular contact, and a contact switch is arranged on the surface of the bottom plate. The flue gas collecting system has the advantages that flue gas is exhausted through the flue gas collecting cover on one side of the chute, the pipeline and the negative pressure flue gas exhaust pipe, the flue gas escaping in the molten aluminum injection process is effectively collected, the purposes of emission reduction and environmental protection are achieved, and harm to occupational health of staff is greatly reduced in the secondary process.

Description

Technical Field

[0001] This utility model relates to the field of flue gas removal technology, specifically to a flue gas removal system for a mixing furnace flue gas chute. Background Technology

[0002] Molten aluminum produced from the electrolytic cell needs to be temporarily stored in a mixing furnace. Molten aluminum is produced every 10-20 minutes, and each time a vacuum ladle is poured, it takes 10-20 minutes, completed using an overhead crane to suspend the ladle. Currently, in the foundry workshop, during the process of injecting molten aluminum into six mixing furnaces using vacuum ladles, the molten aluminum enters the mixing furnace through a chute. As the molten aluminum flows through the chute, the carbon residue and impurities it carries come into contact with air and combust, releasing heat and producing a large amount of flue gas. This flue gas affects the working environment, causing significant environmental pollution. Furthermore, long-term inhalation of the flue gas can lead to pneumoconiosis in employees, causing irreversible health problems. Therefore, the recovery of flue gas from the chute is an urgent problem to be solved. Utility Model Content

[0003] The purpose of this invention is to provide a flue gas removal system for a mixing furnace chute.

[0004] This utility model is implemented by the following technical solution:

[0005] A flue gas removal system for a mixing furnace chute includes a flue gas collection system and a sensing detection device. The flue gas collection system includes a negative pressure dust collector, a negative pressure exhaust pipe, and a flue gas hood. The air inlet of the negative pressure dust collector is connected to one end of the negative pressure exhaust pipe. The flue gas hood is located on one side of the mixing furnace chute and is connected to the negative pressure exhaust pipe through a pipe.

[0006] The sensing detection device includes a trigger switch mechanism, an electrically controlled valve, and a controller. The electrically controlled valve is installed on the pipeline. The trigger switch mechanism includes a contact rod, an L-shaped rod, a base plate, a tension spring, and a spring. The L-shaped rod is placed horizontally and fixed to the bottom of the mixing furnace chute. The long end of the L-shaped rod is fixed to the base plate, and the short end of the L-shaped rod points downward and is fixed with an elliptical body. The contact rod has a through groove, and two opposite side walls of the through groove have sliding grooves. The elliptical body is placed in the through groove, and both ends of the elliptical body slide in the corresponding sliding grooves. The upper end of the contact rod facing the base plate is fixed to one end of the tension spring, and the other end of the tension spring is fixed to the L-shaped rod.

[0007] One end of the contact rod facing the base plate is fixed to one end of the spring, and the other end of the spring is fixed with a circular contact. A contact switch is provided on the surface of the base plate, and the signal output end of the contact switch is connected to the signal input end of the controller. The controller is electrically connected to the electrically controlled valve.

[0008] Preferably, the device further includes a delay mechanism placed between the contact rod and the base plate. The delay mechanism includes a pair of sleeves arranged vertically, one end of which is closed and the other end is open. A piston and a compression spring are located inside the sleeve. One end of the piston is fixed to one end of the compression spring, and the other end of the compression spring is fixed to the closed end of the sleeve. A through hole is provided on the side wall of the sleeve on one side of the compression spring. The other end of the piston is fixed to one end of the piston rod. The other end of the piston rod is hinged to the end of the contact rod via a hinge. The closed end of the sleeve is hinged to the base plate via a hinge.

[0009] Preferably, the hinge is two interlocking rings.

[0010] Preferably, the piston is made of rubber, and the spring force is greater than the frictional force between the piston and the inner wall of the sleeve.

[0011] Advantages of this utility model:

[0012] 1) Design a flue gas collection system that utilizes negative pressure airflow to exhaust flue gas through a flue gas hood, pipes, and negative pressure exhaust pipe on one side of the chute. This effectively collects the flue gas that escapes during the aluminum molten metal injection process, achieving the goal of emission reduction and environmental protection, and greatly reducing the occupational health hazards to employees in the process.

[0013] 2) Design an induction detection device. When the vacuum bag is suspended on one side of the chute, it touches the trigger switch mechanism, triggering the contact switch, which in turn starts the valve and the smoke collection hood exhausts smoke. After the vacuum bag leaves, the proximity switch is disconnected, the valve closes, the negative pressure suction is not wasted, and the energy consumption of the negative pressure dust collector is reduced.

[0014] 3) Design a delay structure on the sensing and detection device. The contact switch will be disconnected after the vacuum bag leaves the trigger switch mechanism for a certain period of time, and the negative pressure air will be stopped later. This can ensure that all the residual flue gas on the chute is discharged. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 yes Figure 1 A magnified view of part A in the diagram.

[0018] Figure 3This is a schematic diagram of the slot and elliptical structure connection of the delay mechanism.

[0019] Figure 4 This is a control block diagram of the present invention.

[0020] In the diagram: 1. Flue gas collection system; 1.1. Negative pressure dust collector; 1.2. Negative pressure exhaust pipe; 1.3. Flue gas hood; 2. Induction detection device; 2.1. Trigger switch mechanism; 2.1. Contact rod; 2.1.1. L-shaped rod; 2.1.2. Base plate; 2.1.3. Tension spring; 2.1.4. Spring; 2.1.5. Ellipse; 2.1.6. Through groove; 2.1.7. Slide groove; 2.1.8. Circular contact; 2.1.9. Contact switch; 2.1.10. Electrically controlled valve; 2.2. Controller; 2.3. Mixing furnace chute; 3. Pipe; 4. Delay mechanism; 5. Sleeve; 5.1. Piston; 5.2. Compression spring; 5.3. Through hole; 5.4. Piston rod; 5.5. Hinge; 6. Ring; 6.1. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a flue gas removal system for a mixing furnace chute includes a flue gas collection system 1 and a sensing detection device 2. The flue gas collection system 1 includes a negative pressure dust collector 1.1, a negative pressure exhaust pipe 1.2, and a flue gas hood 1.3. The air inlet of the negative pressure dust collector 1.1 is connected to one end of the negative pressure exhaust pipe 1.2. The flue gas hood 1.3 is located on one side of the mixing furnace chute 3 and is connected to the negative pressure exhaust pipe 1.2 through a pipe 4. The flue gas collection system 1 generates negative pressure air through the negative pressure dust collector 1.1 to draw in flue gas. The flue gas generated on the mixing furnace chute 3 during aluminum pouring is discharged sequentially through the negative pressure exhaust pipe 1.2 and the flue gas hood 1.3, effectively collecting the flue gas emitted during the aluminum pouring process, achieving the goal of emission reduction and environmental protection, and greatly reducing the occupational health hazards to employees in this process. In this embodiment, flue gas hoods 1.3 can be installed on multiple mixing furnace chutes 3.

[0023] The sensing detection device 2 includes a trigger switch mechanism 2.1, an electrically controlled valve 2.2, and a controller 2.3. The electrically controlled valve 2.2 is installed on the pipe 4 and controls the opening and closing of the pipe 4, thereby switching the negative pressure air of the smoke collection hood 1.3.

[0024] The trigger switch mechanism 2.1 includes a contact rod 2.1.1, an L-shaped rod 2.1.2, a base plate 2.1.3, a tension spring 2.1.4, and a spring 2.1.5. The L-shaped rod 2.1.2 is placed horizontally and fixed to the bottom of the mixing furnace chute 3. The long end of the L-shaped rod 2.1.2 is fixed to the base plate 2.1.3, and the short end of the L-shaped rod 2.1.2 is downward and fixed with an elliptical body 2.1.6. The contact rod 2.1.1 is provided with a through groove 2.1.7, and the two opposite side walls of the through groove 2.1.7 are provided with sliding grooves 2.1.8. The elliptical body 2.1.6 is placed in the through groove 2.1.7, and the two ends of the elliptical body 2.1.6 slide in the corresponding sliding grooves 2.1.8. The upper end of the contact rod 2.1.1 facing the base plate 2.1.3 is fixed to one end of the tension spring 2.1.4, and the other end of the tension spring 2.1.4 is fixed to the L-shaped rod 2.1.2.

[0025] The length of the tension spring 2.1.4 pulls one end of the contact rod 2.1.1, causing the other end of the contact rod 2.1.1 to tilt slightly. The elastic force of the tension spring 2.1.4 keeps the contact rod 2.1.1 in a slightly tilted state.

[0026] When a vacuum ladle is suspended on one side of the mixing furnace chute 3 for aluminum pouring, due to the limited position of the vacuum ladle, it will inevitably touch the raised end of the contact rod 2.1.1. This causes the contact rod 2.1.1 to slide on the elliptical body 2.1.6 through the through groove 2.1.7, and then move backward. The tension spring 2.1.4 is also pulled. The end of the elliptical body 2.1.6 slides in the slide groove 2.1.8. Due to the arc shape of the end of the elliptical body 2.1.6, the contact rod 2.1.1 can move back and forth on the elliptical body 2.1.6 through the through groove 2.1.7, and can also make slight adjustments up and down and left and right, providing room for movement to adapt to the multi-directional contact movement of the vacuum ladle.

[0027] One end of the contact rod 2.1.1 facing the base plate 2.1.3 is fixed to one end of the spring 2.1.5. The other end of the spring 2.1.5 is fixed with a circular contact 2.1.9. A contact switch 2.1.10 is provided on the surface of the base plate 2.1.3. The signal output terminal of the contact switch 2.1.10 is connected to the signal input terminal of the controller 2.3. The controller 2.3 is electrically connected to the electrically controlled valve 2.2. When the contact rod 2.1.1 moves, it causes the spring 2.1.5 and the circular contact 2.1.9 to press against the contact switch 2.1.10. The contact switch 2.1.10 senses this and sends a signal to the controller 2.3. In this embodiment, a PLC controller is preferred. This causes the electrically controlled valve 2.2 to open, and the smoke hood 1.3 has negative pressure air to remove the smoke. The spring 2.1.5 is softly connected to avoid damaging the contact switch 2.1.10.

[0028] When the vacuum lifting bag leaves one side of the mixing furnace chute 3 and moves away from the contact rod 2.1.1, it is subjected to the elastic force of the tension spring 2.1.4. The contact rod 2.1.1 moves forward to reset, and the contact switch 2.1.10 senses it and sends a signal to the controller 2.3, which then causes the electrically controlled valve 2.2 to close. When aluminum is not being poured, the unused fume hood 1.3 has no negative pressure airflow, and the negative pressure suction is not wasted, reducing the energy consumption of the negative pressure dust collector.

[0029] It also includes a delay mechanism 5 placed between the contact rod 2.1.1 and the base plate 2.1.3. The delay mechanism 5 includes a pair of sleeves 5.1 arranged vertically. One end of the sleeve 5.1 is closed and the other end is open. Inside the sleeve 5.1, there is a piston 5.2 and a compression spring 5.3. One end of the piston 5.2 is fixed to one end of the compression spring 5.3, and the other end of the compression spring 5.3 is fixed to the closed end of the sleeve 5.1. A through hole 5.4 is provided on the side wall of the sleeve 5.1 on one side of the compression spring 5.3. The other end of the piston 5.2 is fixed to one end of the piston rod 5.5. The other end of the piston rod 5.5 is hinged to the end of the contact rod 2.1.1 through a hinge 6. The closed end of the sleeve 5.1 is hinged to the base plate 2.1.3 through a hinge 6.

[0030] Add a delay mechanism 5. When a vacuum ladle is suspended on one side of the mixing furnace chute 3 for aluminum pouring, the vacuum ladle touches the contact rod 2.1.1 with great force. The contact rod 2.1.1 also drives the piston rod 5.5 to press the piston 5.2 into the sleeve 5.1. The sleeve 5.1 exhausts air through the through hole 5.4, and the compression spring 5.3 is compressed.

[0031] When the vacuum ladle leaves one side of the mixing furnace chute 3 and moves away from the contact rod 2.1.1, the contact rod 2.1.1 will not immediately move forward to reset. The principle is that the sleeve 5.1 slowly introduces air through the through hole 5.4, while the compression spring 5.3 pushes the piston 5.2 to move inside the sleeve 5.1 through the elastic force. However, due to the friction between the piston 5.2 and the inner wall of the sleeve 5.1, the piston 5.2 moves slowly, which in turn makes the contact rod 2.1.1 move forward to reset slowly, achieving the purpose of delayed reset of the contact rod 2.1.1. The delay time should be shorter than the time of the next aluminum pouring to avoid failure to reset in time. If the vacuum ladle leaves the mixing furnace chute 3, there will be flue gas that has not been completely discharged, but the negative pressure air has stopped. Therefore, delaying the stop of the negative pressure air can ensure that the residual flue gas is completely discharged.

[0032] The hinge 6 consists of two interlocking rings 6.1 with a large clearance. When the vacuum lifting bag touches the contact rod 2.1.1, the displacement between the piston rod 5.5 and the contact rod 2.1.1, and between the sleeve 5.1 and the base plate 2.1.3, requires space. Therefore, the hinge 6 can meet the usage requirements.

[0033] The piston 5.2 is made of rubber, and the elastic force of the compression spring 5.3 is greater than the friction between the piston 5.2 and the inner wall of the sleeve 5.1.

[0034] Working principle: When this utility model is in use, the negative pressure dust collector 1.1 generates negative pressure air. When the vacuum lifting ladle is suspended on one side of the mixing furnace chute 3 for aluminum pouring, the vacuum lifting ladle touches the contact rod 2.1.1, causing the contact rod 2.1.1 to move backward through the through groove 2.1.7 onto the elliptical body 2.1.6. This causes the spring 2.1.5 and the circular contact 2.1.9 to press against the contact switch 2.1.10. The contact switch 2.1.10 senses this and sends a signal to the controller 2.3, which then causes the electric control valve 2.2 to open. The flue gas hood 1.3 receives negative pressure air, which passes through the negative pressure exhaust pipe 1.2 and the flue gas hood 1.3 in sequence to exhaust the flue gas generated on the mixing furnace chute 3 during aluminum pouring.

[0035] When the vacuum lifting ladle leaves one side of the mixing furnace chute 3 and moves away from the contact rod 2.1.1, it is subjected to the elastic force of the tension spring 2.1.4, causing the contact rod 2.1.1 to move forward and reset. Due to the action of the delay mechanism 5, it will not reset immediately. The compression spring 5.3 pushes the piston 5.2 to move inside the sleeve 5.1 through the elastic force. Due to the friction between the piston 5.2 and the inner wall of the sleeve 5.1, the piston 5.2 moves slowly, which in turn makes the contact rod 2.1.1 move forward and reset slowly. The contact switch 2.1.10 is disconnected and sends a signal to the controller 2.3, which then causes the electric control valve 2.2 to close. When aluminum is not being poured, the unused fume hood 1.3 has no negative pressure air. The delayed reset allows the negative pressure air to stop later, ensuring that all residual flue gas is discharged.

[0036] Advantages: 1) The design of the flue gas collection system 1 utilizes negative pressure wind power to discharge the flue gas through the flue gas hood 1.3, pipe 4 and negative pressure exhaust pipe 1.2 on one side of the chute, effectively collecting the flue gas emitted during the aluminum molten metal injection process, achieving the goal of emission reduction and environmental protection, and greatly reducing the occupational health hazards to employees in the process.

[0037] 2) Design an induction detection device 2. When the vacuum bag is suspended on one side of the chute, it touches the trigger switch mechanism 2.1, triggering the contact switch 2.1.10, which in turn starts the valve and the smoke collection hood exhausts smoke. After the vacuum bag leaves, the proximity switch is disconnected, the valve is closed, the negative pressure suction is not wasted, and the energy consumption of the negative pressure dust collector is reduced.

[0038] 3) A delay structure 5 is designed on the sensing and detection device 2. After the vacuum lifting bag leaves the trigger switch mechanism 2.1 for a certain period of time, the contact switch 2.1.10 is disconnected, and the negative pressure air stops later, which can ensure that the residual flue gas on the chute is completely discharged.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A flue gas removal system for a mixing furnace chute, characterized in that, The system includes a flue gas collection system and a sensing detection device. The flue gas collection system includes a negative pressure dust collector, a negative pressure exhaust pipe, and a flue gas hood. The air inlet of the negative pressure dust collector is connected to one end of the negative pressure exhaust pipe. The flue gas hood is located on one side of the mixing furnace chute and is connected to the negative pressure exhaust pipe through a pipe. The sensing detection device includes a trigger switch mechanism, an electrically controlled valve, and a controller. The electrically controlled valve is installed on the pipeline. The trigger switch mechanism includes a contact rod, an L-shaped rod, a base plate, a tension spring, and a spring. The L-shaped rod is placed horizontally and fixed to the bottom of the mixing furnace chute. The long end of the L-shaped rod is fixed to the base plate, and the short end of the L-shaped rod points downward and is fixed with an elliptical body. The contact rod has a through groove, and two opposite side walls of the through groove have sliding grooves. The elliptical body is placed in the through groove, and both ends of the elliptical body slide in the corresponding sliding grooves. The upper end of the contact rod facing the base plate is fixed to one end of the tension spring, and the other end of the tension spring is fixed to the L-shaped rod. One end of the contact rod facing the base plate is fixed to one end of the spring, and the other end of the spring is fixed with a circular contact. A contact switch is provided on the surface of the base plate, and the signal output end of the contact switch is connected to the signal input end of the controller. The controller is electrically connected to the electrically controlled valve.

2. The flue gas removal system for a mixing furnace chute according to claim 1, characterized in that: It also includes a delay mechanism placed between the contact rod and the base plate. The delay mechanism includes a pair of sleeves arranged vertically, one end of the sleeve is closed and the other end is open. A piston and a compression spring are inside the sleeve. One end of the piston is fixed to one end of the compression spring, and the other end of the compression spring is fixed to the closed end of the sleeve. A through hole is provided on the side wall of the sleeve on one side of the compression spring. The other end of the piston is fixed to one end of the piston rod. The other end of the piston rod is hinged to the end of the contact rod through a hinge. The closed end of the sleeve is hinged to the base plate through a hinge.

3. The flue gas removal system for a mixing furnace chute according to claim 2, characterized in that: The hinge consists of two interlocking rings.

4. The flue gas removal system for a mixing furnace chute according to claim 3, characterized in that: The piston is made of rubber, and the spring force is greater than the frictional force between the piston and the inner wall of the sleeve.

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