Material metering and weighing system of vacuum refining furnace

Abstract

The utility model discloses a material metering and weighing system of a vacuum refining furnace. A first vibrating feeder, a hopper scale, a second vibrating feeder, a first pneumatic vacuum gate valve, a middle section articulated chute and a second pneumatic vacuum gate valve are sequentially arranged from an upstream storage bin to the bottom; the first vibration feeder is installed above a feeding port of the hopper scale, and the first vibration feeder and the feeding port of the hopper scale are connected in a fastened mode through a damping gasket and a bolt. The vibrating feeder and the upstream storage bin feeding baffle are connected through an electric signal so as to achieve synchronous control. A flexible buffer layer made of polyurethane is arranged between the hopper scale and the second vibrating feeder; the valve plate and the valve body are sealed by a silicon carbide material; the middle-section articulated chute is connected with the pneumatic vacuum gate valve through a flange, and the flange surface is coated with sealant and fastened through a bolt; an included angle of 20-30 degrees is formed between the middle section of the articulated chute and the vertical direction, and the other articulated chutes are perpendicular to the horizontal plane.

Description

Technical Field

[0001] The utility model belongs to the technical field of metallurgy and relates to a material metering and weighing system for a vacuum refining furnace, which is used for online non-continuous cumulative automatic weighing of production raw materials smelted in a vacuum furnace of a steelmaking plant. Background Art

[0002] In the vacuum furnace smelting process of the steel production line, the accuracy of raw material addition is directly related to the quality control of the product element ratio and structural distribution, and this process faces significant challenges of air pressure fluctuations. Specifically, the difference in air pressure inside and outside the vacuum furnace and its periodic changes not only increase the complexity of operation, but also significantly affect the accuracy of the hopper scale used for raw material metering. Since the hopper scale is directly exposed to the junction of vacuum and non-vacuum environments, its measurement mechanism is easily disturbed by external air pressure changes, resulting in a significant increase in metering errors, which in turn poses a serious threat to the quality control of subsequent production processes.

[0003] At present, although some scale manufacturers have tried to deal with this problem by integrating air pressure compensation systems, the existing solutions are still not effective enough in practical applications. These systems often rely on complex program design and high technical parameter tuning, which not only requires a deep professional technical background, but also involves the manufacturer's core technical secrets, making it difficult for users to adjust and maintain them independently, increasing operating costs and technical barriers.

[0004] In view of this, developing a new type of hopper scale metering system to achieve accurate metering of raw material addition under vacuum environment has become a key technical problem that needs to be solved in the current steelmaking industry. The system needs to have the following core features:

[0005] Air pressure isolation and adaptive adjustment: Through innovative design, the hopper scale is physically or functionally isolated from the vacuum environment. At the same time, the built-in intelligent air pressure sensing and compensation mechanism can sense and automatically adjust the metering error caused by air pressure changes in real time, ensuring the stability and accuracy of the metering results.

[0006] Simplify operation and maintenance: The system structure design should fully consider user-friendliness, reduce unnecessary complex adjustment steps, reduce dependence on professional technicians, and achieve fast installation, convenient operation and low-cost maintenance.

[0007] High precision and reliability: In vacuum and pressure fluctuation environment, it can still maintain high-precision metering capability to ensure accurate control of raw material addition and meet the high standards of element ratio and structural distribution in steelmaking production.

[0008] Environmental adaptability: The system should have good environmental adaptability and be able to operate stably under different working conditions, including but not limited to changes in temperature, humidity and gas composition, to ensure stability and reliability in long-term use. Summary of the Utility Model

[0009] The utility model provides a material metering and weighing system for a vacuum refining furnace, which is installed at the position where raw materials are added to the vacuum furnace in the steelmaking production line. It can eliminate the negative impact of the front-back air pressure difference on the metering link, improve the metering precision and the output quality of the next link.

[0010] Technical solution of the utility model:

[0011] From the upstream storage bin downwards, there are arranged in sequence a first vibrating feeder, a hopper scale, a second vibrating feeder, a first pneumatic vacuum flap valve, an intermediate section chute pipe, and a second pneumatic vacuum flap valve; the first vibrating feeder is installed above the feed inlet of the hopper scale, and a shock-absorbing washer and bolts are used for fastening connection between the first vibrating feeder and the feed inlet of the hopper scale; the vibrating feeder and the feed baffle of the upstream storage bin are connected by an electric signal to achieve synchronous control; there is a flexible buffer layer made of polyurethane between the hopper scale and the second vibrating feeder; the valve plate and the valve body are sealed with silicon carbide material; the intermediate section chute pipe and the pneumatic vacuum flap valve are connected by a flange, the flange surface is coated with sealant and fastened with bolts; the intermediate section chute pipe is arranged at an angle of 20-30° with the vertical direction, and the rest of the chute pipes are installed perpendicular to the horizontal plane.

[0012] Innovative points and advantages of the utility model: The separated structural design not only ensures the independence of the weighing equipment but also gives greater flexibility to the whole structure. Both the intermediate section chute pipe and the hopper scale can be changed according to the usage requirements, with high compatibility; the modular composition can better help maintenance personnel determine the problem points and improve the maintenance efficiency; the design of separating the environment can ensure from the source that the usage environment of the hopper scale is not affected by external forces, reduce the complexity of the whole weighing logic, and reduce the usage cost; the structure is simple, easy to replace, the function of each device is clearly independent, improving the resource utilization rate and reducing the difficulty of finding the cause of the fault. Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of the material metering and weighing system for the vacuum refining furnace.

[0014] In the figure: 1. First vibrating feeder; 2. Hopper scale; 3. Second vibrating feeder; 4. First pneumatic vacuum flap valve; 5. Intermediate section chute pipe; 6. Second pneumatic vacuum flap valve. Detailed Embodiment

[0015] The following is described with reference to the embodiments of the drawings.

[0016] Figure 1As shown in the figure: A material metering and weighing system for a vacuum refining furnace is arranged successively from the upstream storage bin downwards as the first vibrating feeder 1, hopper scale 2, second vibrating feeder 3, first pneumatic vacuum flap valve 4, intermediate section chute 5, and second pneumatic vacuum flap valve 6. The first vibrating feeder 1 is installed above the feed inlet of the hopper scale 2, and a shock-absorbing washer and bolts are used for fastening connection between the first vibrating feeder 1 and the feed inlet of the hopper scale 2. The second vibrating feeder 2 is electrically connected to the feed baffle of the upstream storage bin to achieve synchronous control. There is a flexible buffer layer made of polyurethane between the hopper scale 2 and the second vibrating feeder 3.

[0017] For the two groups of vacuum valve plates and the valve body, silicon carbide with high wear resistance and corrosion resistance is used for sealing; the inner surface of the intermediate section chute 5 is smooth; flange connection is adopted between the intermediate section chute 5 and the two groups of pneumatic vacuum flap valves, the flange surface is coated with sealant and fastened with bolts; the intermediate section chute 5 is arranged at an angle of 20 - 30° with the vertical direction, and the rest of the chutes are installed perpendicular to the horizontal plane.

[0018] Working principle of the material metering and weighing system for the vacuum refining furnace:

[0019] Initial loading and automatic stop mechanism: First, the storage bin is completely filled with materials, and then the No. 1 vibrating feeder is started. Through mechanical vibration, the materials are continuously conveyed into the metering hopper. This feeding process is strictly monitored by a high-precision instrument. Once the instrument shows that the material quantity in the hopper scale reaches 90% of its maximum range, the automatic stop mechanism is immediately triggered, and the No. 1 vibrating feeder stops working immediately to ensure that the hopper scale will not be overloaded.

[0020] Precise feeding and dynamic monitoring: When the system receives an instruction to convey a specified weight of materials to the downstream link, the hopper scale that has been pre-loaded with 90% enters the ready state. After the hopper scale discharge plate receives the feeding weight signal according to the preset instruction, it automatically opens. At the same time, the first pneumatic vacuum flap valve at the upper part of the intermediate section chute opens. Subsequently, the No. 2 vibrating feeder is started to further supplement materials to the hopper scale. The built-in real-time monitoring system of the system continuously tracks the change of the weighing data of the hopper scale. Once the change difference reaches the specified feeding weight, the closing mechanism is immediately triggered. First, the hopper scale discharge baffle is closed, and a time delay is set to ensure that after the materials completely enter the intermediate section chute, the upper first pneumatic vacuum flap valve is automatically closed to complete the precise feeding process.

[0021] Air pressure adjustment and material transfer: With the closing of the upper first pneumatic vacuum flap valve, the second pneumatic vacuum flap valve and the end cone valve at the lower part of the intermediate section chute are successively and automatically opened to adjust the air pressure in the intermediate section chute to match the vacuum environment of the lower link. Subsequently, the materials in the intermediate section chute smoothly enter the lower output link under the action of the air pressure difference, completing the entire conveying cycle.

[0022] Cyclic operation and precise control: The above process realizes cyclic operation through an automated control system, and each step is precisely controlled by time and monitored by data.

[0023] Working process of the material metering and weighing system for the vacuum refining furnace:

[0024] Fill the storage bin with materials, start the 1 (vibrating feeder) shown in the figure to feed materials into the metering hopper. When the instrument shows that the feeding reaches 90% of the maximum range of the hopper scale, the vibration automatically stops.

[0025] When materials of a specified weight need to be fed to the downstream section, the discharge plate of the hopper scale that has been loaded with 90% of the maximum range receives the feeding weight signal and automatically opens according to the instruction. At the same time, open the 4 (the first pneumatic vacuum plug valve at the upper part of the intermediate section chute), start the 3 (the second vibrating feeder) for feeding. The system continuously monitors the real-time change of the weighing data of the 2 (hopper scale). When the change difference of the weighing data reaches the specified discharging weight, automatically close the discharge baffle of the hopper scale. After a certain time, when it is expected that all the materials of this discharging have entered the 5 (intermediate section chute), automatically close the 1 (the first pneumatic vacuum plug valve).

[0026] After the first pneumatic vacuum plug valve 1 is closed, the second pneumatic vacuum plug valve 6 located at the lower part of the intermediate section chute automatically opens, adjusts the air pressure in the intermediate section chute 5 to be the same as the vacuum environment of the lower section, and at the same time sends the materials in the intermediate section chute into the lower output section.

[0027] Repeat this process to achieve precise discharging without air pressure influence.

[0028] The pneumatic vacuum plate valve model in the embodiment is DN300, which needs to be installed strictly according to the technical requirements and subjected to an airtightness test. The size of the intermediate section chute is designed as Φ273*8, and the total material storage capacity of the entire intermediate section can reach 900 kg, which is sufficient to meet most discharging requirements. If a larger discharging volume is needed, it can be widened or lengthened according to the requirements. The top chute has the same size as the intermediate section chute to avoid excessive impact or material jamming during the discharging process. The overall vertical height difference of the intermediate section chute is 1200 mm. The chutes are connected by flanges. Below the cone valve is the vacuum furnace.

Claims

1. A material metering and weighing system for a vacuum refining furnace, characterized in that: From the upstream storage bin downward, they are arranged in sequence as the first vibrating feeder, hopper scale, second vibrating feeder, first pneumatic vacuum flap valve, intermediate chute, and second pneumatic vacuum flap valve; the first vibrating feeder is installed above the feed inlet of the hopper scale, and a shock-absorbing washer and bolts are used for fastening connection between the first vibrating feeder and the feed inlet of the hopper scale; the vibrating feeder and the feeding baffle of the upstream storage bin are connected by an electrical signal to achieve synchronous control; there is a flexible buffer layer made of polyurethane between the hopper scale and the second vibrating feeder; the valve plate and the valve body are sealed with silicon carbide material; the intermediate chute and the pneumatic vacuum flap valve are connected by a flange, the flange surface is smeared with sealant and fastened with bolts; the intermediate chute is arranged at an angle of 20-30° with the vertical direction, and the rest of the chutes are installed perpendicular to the horizontal plane.

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