Belt protection type quantitative coal feeder

Abstract

The utility model relates to a belt protection type constant coal feeder, and relates to the technical field of coal feeders, in order to solve the problem of deviation of a skirt belt of the constant coal feeder, the belt protection type constant coal feeder comprises a coal feeder body, the skirt belt is arranged in the coal feeder body, a raw coal bunker is arranged at the top of the coal feeder body, a purging mechanism is arranged in the coal feeder body, and the purging mechanism is arranged in the coal feeder body. The purging mechanism comprises a variable-diameter compression nozzle, a seamless steel pipe and gas supply equipment, the gas supply equipment is arranged outside the coal feeder body, one end of the seamless steel pipe is communicated with the gas supply equipment, the other end of the seamless steel pipe extends into the coal feeder body, the seamless steel pipe is communicated with the variable-diameter compression nozzle, and the variable-diameter compression nozzle is communicated with the gas supply equipment. The variable-diameter compression nozzle is arranged below the skirt belt and is provided with two groups of air nozzles, and the two groups of air nozzles of the variable-diameter compression nozzle are arranged towards the bottom of the skirt belt. The device has the effects of reducing belt deviation and reducing the abrasion and tearing risk of the belt.

Description

Technical Field

[0001] This application relates to the technical field of coal feeders, and particularly to a belt protection type metering coal feeder. Background Art

[0002] In the coal injection process of an ironmaking plant, the weighing coal feeder plays a crucial role. It undertakes the task of precisely regulating and quantitatively conveying fuel to the coal mill. This efficient device integrates a machine body, a coal conveying belt system, a driving mechanism, a high-precision weighing system, an automatic cleaning mechanism, and an advanced belt blockage and coal interruption instant alarm system, jointly constituting its complex and precise structural system; the upper part of the coal feeder is ingeniously connected to the coal bunker through a raw coal conveying pipeline to achieve continuous supply of coal material, while its lower part is seamlessly connected to the coal mill to ensure that the coal material can smoothly and accurately enter the next process. In the entire production process, a negative pressure environment is maintained inside the coal feeder to optimize the coal material conveying efficiency and reduce dust pollution.

[0003] However, during the actual operation process, when the raw coal bunker starts to release coal material into the coal feeder, a large amount of raw coal will fall, and some coal material may accidentally spill to the position near the tail wheel redirecting roller on the non-working surface of the metering coal feeder, resulting in the deviation of the skirt belt. If the deviation is large, it will trigger the deviation interlock trip, affecting the production rhythm. At the same time, the continuous deviation exacerbates the wear of the skirt belt and the roller, increases the maintenance cost, and shortens the service life, so it needs to be improved. Utility Model Content

[0004] In order to solve the problem of the deviation of the skirt belt of the metering coal feeder, this application provides a belt protection type metering coal feeder.

[0005] A belt protection type metering coal feeder provided by this application adopts the following technical solutions:

[0006] A belt protection type metering coal feeder includes a coal feeder body. A skirt belt is arranged inside the coal feeder body. A raw coal bunker is arranged at the top of the coal feeder body. A purging mechanism is arranged inside the coal feeder body. The purging mechanism includes a variable diameter compression nozzle, a seamless steel pipe, and a gas supply device. The gas supply device is arranged outside the coal feeder body. One end of the seamless steel pipe is connected to the gas supply device, and the other end of the seamless steel pipe extends into the coal feeder body and is connected to the variable diameter compression nozzle. The variable diameter compression nozzle is arranged below the skirt belt. The variable diameter compression nozzle is provided with two groups of jet ports, and both groups of jet ports of the variable diameter compression nozzle are arranged towards the bottom of the skirt belt.

[0007] When the raw coal bunker starts to release coal materials into the coal feeder, a large amount of raw coal will fall. Some coal materials may accidentally spill to the position near the tail wheel redirecting roller on the non-working surface of the constant - rate coal feeder, which may cause the skirt - edge belt to deviate. If the deviation is large, it will trigger the deviation - interlock tripping of the machine, affecting the production rhythm. At the same time, the continuous deviation exacerbates the wear of the skirt - edge belt and the roller, increasing the maintenance cost and shortening the service life. By adopting the above - mentioned technical solution, including the coal feeder body, the skirt - edge belt is installed in the coal feeder body, and the purging mechanism is installed in the coal feeder body. The purging mechanism includes a variable - diameter compression nozzle, a seamless steel pipe, and a gas - supply device. When the mill continuously prepares pulverized coal, raw coal lumps enter the constant - rate coal feeder from the raw coal bunker. The raw coal lumps are continuously transported through the working surface of the skirt - edge belt. When the raw coal lumps contact the working surface of the skirt - edge belt, due to the impact force of free - fall, some coal lumps bounce and fall into the lower part on the working surface of the skirt - edge belt and enter the non - working surface of the skirt - edge belt. The gas - supply device supplies gas through the seamless steel pipe, and the variable - diameter compression nozzle purges the raw coal lumps on the non - working surface of the skirt - edge belt, causing the raw coal lumps to fall from the skirt - edge belt. Through the setting of the purging mechanism, the accumulated coal lumps are effectively removed, thereby reducing the belt deviation, reducing the risk of belt wear and tear, improving the continuity and stability of production, reducing the equipment shutdown time and maintenance cost caused by deviation, and extending the service life of the equipment.

[0008] Optionally, the gas - supply device includes a gas - source pipeline and a nitrogen cannon. The gas - source pipeline is connected to the nitrogen cannon, and one end of the seamless steel pipe far from the variable - diameter compression nozzle is connected to the gas - source pipeline.

[0009] By adopting the above - mentioned technical solution, for the gas - source pipeline and the nitrogen cannon, during the process of the gas - source pipeline leading to the nitrogen cannon, the seamless steel pipe is connected to the gas - source pipeline to achieve flow - splitting. Through the setting of the gas - source pipeline and the nitrogen cannon, it helps to achieve efficient gas supply. At the same time, by using the existing gas - source pipeline system, there is no need to construct or purchase new gas - supply equipment additionally, reducing the equipment investment cost. At the same time, it also reduces the additional work such as installation, commissioning, and maintenance that may be brought by the introduction of new equipment.

[0010] Optionally, a tee joint for connection is arranged between the seamless steel pipe and the gas - source pipeline.

[0011] By adopting the above - mentioned technical solution, the tee joint is installed between the seamless steel pipe and the gas - source pipeline. The gas - source pipeline can be divided into two sections. The two sections of the gas - source pipeline are respectively connected to the two main ports of the tee joint, and the seamless steel pipe is connected to the side port of the tee joint to achieve connection. Through the setting of the tee joint, it provides great flexibility, enabling the gas source to be distributed to different paths according to needs. At the same time, the installation is simple and fast, greatly shortening the equipment installation time, easy to disassemble, and also facilitating subsequent maintenance and repair work.

[0012] Optionally, a control ball valve for controlling the gas flow rate is provided on the seamless steel pipe.

[0013] By adopting the above technical solution, the control ball valve is installed on the seamless steel pipe; through the setting of the control ball valve, the supply amount of nitrogen can be adjusted in real time according to the quantity of the scattered coal inside or the cleaning requirement, ensuring the effective utilization of nitrogen, avoiding waste, improving the working efficiency of the equipment, quickly cutting off the gas source at the same time, ensuring the safe progress of the maintenance work, and reducing the risk during the maintenance process.

[0014] Optionally, a metal hose is provided at one end of the seamless steel pipe close to the variable-diameter compression nozzle. One end of the metal hose is connected to the seamless steel pipe, and the other end of the metal hose is connected to the variable-diameter compression nozzle.

[0015] By adopting the above technical solution, the seamless steel pipe and the variable-diameter compression nozzle are connected through the metal hose; through the setting of the metal hose, the metal hose has good flexibility and bendability, can easily extend under the skirt belt, adapt to the complex working environment, and at the same time the metal hose has good corrosion resistance, can operate stably for a long time in the harsh working environment, and prolongs the service life.

[0016] Optionally, a quick connector is provided at the port of the seamless steel pipe, and the metal hose is connected to the quick connector.

[0017] By adopting the above technical solution, the metal hose is installed on the seamless steel pipe through the quick connector; through the setting of the quick connector, it helps to reduce the installation difficulty, facilitate the disassembly and reinstallation of the quick connector and the metal hose, thus simplifying the installation process and the maintenance process.

[0018] Optionally, an electro-hydraulic double-cylinder gate valve for controlling the coal block conveying is provided between the coal feeder body and the raw coal bunker.

[0019] By adopting the above technical solution, the electro-hydraulic double-cylinder gate valve is installed between the coal feeder body and the raw coal bunker; through the setting of the electro-hydraulic double-cylinder gate valve, the conveying amount of coal blocks can be accurately controlled, ensuring that the coal feeder can accurately supply coal to the coal mill according to the demand, realizing automatic control and reducing the tediousness of manual operation.

[0020] Optionally, a cleaning device is provided inside the coal feeder body. The cleaning device is arranged at the bottom of the skirt belt, and a coal mill inlet pipe is provided on the coal feeder body. The cleaning device is arranged in the direction of the coal mill inlet pipe.

[0021] By adopting the above technical solution, the cleaning device is installed inside the coal feeder body and conveys towards the direction of the inlet pipe of the coal mill. When the purging mechanism drops the raw coal lumps from the skirt belt, they scatter to the bottom of the coal feeder body and are continuously cleaned by the bottom cleaning device into the inlet pipe of the coal mill. Through the arrangement of the cleaning device, the raw coal lumps and scattered coal powder dropped from the skirt belt can be removed in time, preventing them from accumulating at the bottom of the coal feeder body, maintaining the cleanliness and smooth operation of the skirt belt, and improving the overall operation efficiency of the coal feeder.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] Through the arrangement of the purging mechanism, the accumulated coal lumps are effectively removed, thereby reducing the belt deviation, reducing the risk of belt wear and tear, improving the continuity and stability of production, reducing the equipment downtime and maintenance costs caused by deviation, and extending the service life of the equipment.

[0024] Through the arrangement of the gas supply pipeline and the nitrogen cannon, it helps to achieve efficient ditch gas supply. At the same time, by using the existing gas supply pipeline system, there is no need to construct or purchase new gas supply equipment additionally, reducing the equipment investment cost, and also reducing the additional work such as installation, commissioning and maintenance that may be brought by the introduction of new equipment.

[0025] Through the arrangement of the metal hose, the metal hose has good flexibility and bendability, can easily extend under the skirt belt to adapt to complex working environments. At the same time, the metal hose has good corrosion resistance and can operate stably for a long time in harsh working environments, extending its service life. Description of the Drawings

[0026] Figure 1 is a schematic structural diagram of a belt protection type metering coal feeder in an embodiment of the present application.

[0027] Figure 2 is a schematic structural diagram for embodying the variable diameter compression nozzle in an embodiment of the present application.

[0028] Description of the reference numerals: 1, coal feeder body; 2, skirt belt; 3, raw coal bin; 4, purging mechanism; 41, variable diameter compression nozzle; 411, air jet port; 42, seamless steel pipe; 43, gas supply equipment; 431, gas supply pipeline; 432, nitrogen cannon; 5, three-way joint; 6, control ball valve; 7, metal hose; 8, quick connector; 9, electro-hydraulic double cylinder gate valve; 10, cleaning device; 11, inlet pipe of coal mill. Detailed Description of the Embodiment

[0029] The following is a further detailed description of the present application in combination with the attached Figure 1-2 drawings.

[0030] An embodiment of the present application discloses a belt protection type constant feeder. Refer to Figure 1 , the belt protection type constant feeder includes a feeder body 1. A raw coal bin 3 is connected to the top of the feeder body 1. A skirted belt 2 is installed inside the feeder body 1. A pulverizer inlet pipe 11 is connected to the bottom of the feeder body 1. The pulverizer inlet pipe 11 can be used to connect to the subsequent pulverizer. In this embodiment, raw coal lumps enter the constant feeder from the raw coal bin 3. The raw coal lumps are continuously transported through the working surface of the skirted belt 2 and enter the subsequent process from the pulverizer inlet pipe 11.

[0031] Refer to Figure 1 , an electro-hydraulic double-cylinder gate valve 9 is installed between the feeder body 1 and the raw coal bin 3. In this embodiment, the electro-hydraulic double-cylinder gate valve 9 can adopt the model DYZF-600-B00. The electro-hydraulic double-cylinder gate valve 9 can accurately control the conveying amount of coal lumps, ensure that the feeder can accurately supply coal to the pulverizer according to requirements, realize automatic control, and reduce the complexity of manual operation.

[0032] Refer to Figure 1 , a purging mechanism 4 is installed inside the feeder body 1. The purging mechanism 4 includes a variable-diameter compression nozzle 41, a seamless steel pipe 42 and a gas supply device 43; the gas supply device 43 includes a gas source pipeline 431 and a nitrogen cannon 432. The gas source pipeline 431 is used to transport the gas source. The nitrogen cannon 432 is installed in the raw coal bin 3. The nitrogen cannon 432 can adopt the model KQP-B-100. The gas source pipeline 431 is connected to the nitrogen cannon 432. The nitrogen cannon 432 receives high-pressure nitrogen or other gases through the gas source pipeline 431 and releases them in a short time, generating a strong impact force. This impact force can directly act on the blocked materials in the raw coal bin 3, such as coal lumps, coal powder, etc., destroy their accumulation structure, thereby dredging the blocked materials and ensuring the smooth operation of the raw coal bin 3.

[0033] Refer to Figure 1 , a three-way joint 5 is installed on the gas source pipeline 431. In this embodiment, the gas source pipeline 431 is divided into two sections. The two sections of the gas source pipeline 431 are respectively connected to the two main ports of the three-way joint 5. The seamless steel pipe 42 is connected to the side port of the three-way joint 5 to realize the connection between the gas source pipeline 431 and the seamless steel pipe 42, providing great flexibility, so that the gas source can be distributed to different paths according to needs.

[0034] Refer to Figure 1 , in this embodiment, a through hole for the seamless steel pipe 42 to pass through is penetrated on the outer shell of the feeder body 1. The seamless steel pipe 42 extends into the feeder body 1. The seamless steel pipe 42 leaves a length of 10 cm outside the outer shell of the feeder body 1, and the inner length is determined according to the actual situation. The seamless steel pipe 42 can adopt the model φ32*4 / 20#.

[0035] Refer toFigure 1 A control ball valve 6 is installed on the seamless steel pipe 42. In this embodiment, the seamless steel pipe 42 is welded with a DN25 single-head external thread (DN25 / L = 100 / 20#). By winding PTFE tape (20mm * 18m * 0.1mm) around the external thread of the single-head external thread and installing the control ball valve 6, the control ball valve 6 can be of the model Q11F-16C / DN25. The control ball valve 6 can adjust the supply amount of nitrogen in real time according to the quantity of the scattered coal inside or the cleaning requirement, ensuring the effective utilization of nitrogen, avoiding waste, and improving the working efficiency of the equipment. At the same time, it can quickly cut off the gas source to ensure the safe progress of the maintenance work and reduce the risk during the maintenance process.

[0036] Refer to Figure 1 At one end of the control ball valve 6 far from the seamless steel pipe 42, a DN25 single-head external thread is installed. A wrench-type quick connector 8 is welded at the single-head external thread. A metal hose 7 is installed on the quick connector 8. The metal hose 7 can be of the model JRLDN25*1000. The metal hose 7 has good flexibility and bendability, can easily extend under the skirt conveyor belt 2 to adapt to the complex working environment. At the same time, the metal hose 7 has good corrosion resistance and can operate stably for a long time in the harsh working environment, extending its service life.

[0037] Refer to Figure 1 and Figure 2 Refer to

[0038] Refer to Figure 1 A cleaning device 10 is installed at the bottom of the coal feeder body 1. In this embodiment, the cleaning device 10 can be different types of cleaners such as scraper cleaning, air blowing cleaning, and rotary brush cleaning. The cleaning device 10 is arranged towards the direction of the mill inlet pipe 11, can timely remove the raw coal blocks and scattered coal powder falling on the skirt conveyor belt 2, avoid their accumulation at the bottom of the coal feeder body 1, keep the skirt conveyor belt 2 clean and running smoothly, and improve the overall operating efficiency of the coal feeder.

[0039] The implementation principle of a belt protection type constant feeder in an embodiment of this application is as follows: When the mill continuously prepares pulverized coal, raw coal lumps enter the constant feeder from the raw coal bunker 3. The raw coal lumps are continuously transported through the working surface of the skirt belt 2. When the raw coal lumps contact the working surface of the skirt belt 2, due to the impact force of free fall, some of each lump rebounds and falls into the lower part on the working surface of the skirt belt 2 and enters the non-working surface of the skirt belt 2. The air supply device 43 supplies air through the seamless steel pipe 42, and the variable diameter compression nozzle 41 blows the raw coal lumps on the non-working surface of the skirt belt 2, so that the raw coal lumps fall from the skirt belt 2 and scatter to the bottom of the feeder body 1, and are continuously swept into the mill inlet pipe 11 through the bottom cleaning device 10; Through the setting of the blowing mechanism 4, the accumulated coal lumps are effectively removed, thereby reducing the belt deviation, reducing the risk of belt wear and tear, improving the continuity and stability of production, reducing the equipment downtime and maintenance cost caused by deviation, and extending the service life of the equipment.

[0040] The above are all preferred embodiments of this application. The protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A belt-protected quantitative coal feeder, comprising a coal feeder body (1), wherein a skirt belt (2) is arranged inside the coal feeder body (1), characterized in that: A raw coal bin (3) is arranged on the top of the coal feeder body (1), and a purging mechanism (4) is arranged inside the coal feeder body (1). The purging mechanism (4) comprises a variable diameter compression nozzle (41), a seamless steel pipe (42) and an air supply device (43). The air supply device (43) is arranged outside the coal feeder body (1), one end of the seamless steel pipe (42) is connected to the air supply device (43), the other end of the seamless steel pipe (42) extends to the inside of the coal feeder body (1), and the seamless steel pipe (42) is connected to the variable diameter compression nozzle (41). The variable diameter compression nozzle (41) is arranged below the skirt belt (2), and the variable diameter compression nozzle (41) is provided with two groups of air jets (411). The two groups of air jets (411) of the variable diameter compression nozzle (41) are both arranged toward the bottom of the skirt belt (2).

2. A belt-protected quantitative coal feeder according to claim 1, characterized in that: The gas supply device (43) comprises a gas source pipeline (431) and a nitrogen gun (432), wherein the gas source pipeline (431) is connected to the nitrogen gun (432), and an end of the seamless steel pipe (42) away from the variable diameter compression nozzle (41) is connected to the gas source pipeline (431).

3. A belt-protected quantitative coal feeder according to claim 2, characterized in that: A three-way joint (5) for connection is provided between the seamless steel pipe (42) and the gas source pipeline (431).

4. The belt-protected quantitative coal feeder according to claim 1, characterized in that: The seamless steel pipe (42) is provided with a control ball valve (6) for controlling the gas flow.

5. The belt-protected quantitative coal feeder according to claim 1, characterized in that: A metal hose (7) is provided at one end of the seamless steel pipe (42) close to the variable-diameter compression nozzle (41); one end of the metal hose (7) is connected to the seamless steel pipe (42), and the other end of the metal hose (7) is connected to the variable-diameter compression nozzle (41).

6. A belt-protected quantitative coal feeder according to claim 5, characterized in that: A quick connector (8) is provided at the port of the seamless steel pipe (42), and the metal hose (7) is connected to the quick connector (8).

7. The belt-protected quantitative coal feeder according to claim 1, characterized in that: An electro-hydraulic double-cylinder gate valve (9) for controlling the transportation of coal blocks is provided between the coal feeder body (1) and the raw coal bin (3).

8. The belt-protected quantitative coal feeder according to claim 1, characterized in that: A cleaning device (10) is provided in the coal feeder body (1), and the cleaning device (10) is arranged at the bottom of the skirt belt (2). A coal mill inlet pipe (11) is provided on the coal feeder body (1), and the cleaning device (10) is arranged in the direction of the coal mill inlet pipe (11).

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