Powder discharging mechanism with air cannon

Abstract

The utility model discloses a powder unloading mechanism with air cannon relates to cement production technical field, the utility model discloses including intercepting chamber, swing type intercepting mechanism and airflow impact mechanism, intercepting chamber upper end is communicated with the unloading pipe lower end unloading port butt joint, swing type intercepting mechanism rotates the assembly in intercepting chamber, airflow impact mechanism is fixed in the unloading pipe side wall, and its gas -out end is through the connecting pipe and is inserted into the unloading pipe and is towards swing type intercepting mechanism, through the swing type intercepting mechanism normality of configuration reset subassembly plugging unloading port, blocks kiln tail high temperature hot gas and up into the unloading pipe, reduces sulphur, alkali, chlorine and other fusible component and low temperature powder contact, effectively restrains the pipe inner wall skin formation, relies on the powder self weight to overcome reset torque and opens the valve unloading automatically. The impact airflow of cooperation airflow impact mechanism output, can shake off the valve plate and pipe mouth adhered powder, prevent the material, can also reverse to the hot gas of the valve gap up and rush, reduce the heat leakage.

Description

Technical Field

[0001] This utility model relates to the field of cement production technology, specifically to a powder feeding mechanism with an air cannon. Background Technology

[0002] In the cement production industry, in the existing kiln tail powder feeding operation, the feeding pipe is directly connected to the kiln tail flue. Due to the negative pressure difference and high-temperature airflow pressure difference inside the kiln tail, it is very easy for high-temperature hot air to rush upward along the feeding pipe.

[0003] The rising high-temperature hot air carries easily fusible components such as sulfur, alkali, and chlorine from inside the kiln, which come into full contact with the low-temperature powder flowing in the feed pipe, causing a molten adhesive layer to quickly form on the surface of the powder. After continuous adhesion and accumulation, a hard crust will form on the inner wall of the pipe.

[0004] The crust gradually reduces the ventilation and material flow area of ​​the feed pipe, increasing the feeding resistance and causing problems such as poor powder feeding and material blockage, which seriously disrupts the stability of the kiln's thermal system. At the same time, the thickened crust is easy to fall off, causing pipe blockage and production interruption. This not only reduces the powder feeding efficiency and the stability of the production line, but also increases energy consumption and requires frequent unblocking. Utility Model Content

[0005] The purpose of this invention is to provide a powder feeding mechanism with an air cannon to address the aforementioned shortcomings in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a powder feeding mechanism with an air cannon, located between the feeding pipe and the kiln tail flue, including an interception chamber, a swing-type interception mechanism, and an airflow impact mechanism; the upper end of the interception chamber is connected to the lower end of the feeding pipe's feeding port; the swing-type interception mechanism is rotatably mounted in the interception chamber and is provided with a reset torque by a reset component to block the feeding port under normal conditions; the airflow impact mechanism is fixed to the side wall of the feeding pipe, and its air outlet extends into the feeding pipe through a connecting pipe and faces the swing-type interception mechanism; when the weight of the powder overcomes the reset torque, the swing-type interception mechanism swings down to open the feeding port, and the airflow impact mechanism outputs impact airflow to shake off the powder and prevent the hot gas from the kiln tail from rising.

[0007] Preferably, the swing-type interception mechanism includes a flip shaft, two sets of mounting brackets, and two bearing seats; the two sets of mounting brackets are symmetrically fixed to the outer walls of both sides of the interception chamber, and each mounting bracket is fixedly mounted with a bearing seat. The flip shaft rotates through the two bearing seats, and the middle part of the flip shaft extends into the internal cavity of the interception chamber.

[0008] Preferably, a material-cutting valve plate is fixedly installed on the middle shaft of the flipping shaft.

[0009] Preferably, the material cutting valve plate has a frustum-shaped structure, and the periphery of the discharge port is provided with a conical sealing slope that matches the conical surface of the material cutting valve plate. When the material cutting valve plate swings upward to the discharge port, its conical surface fits tightly with the conical sealing slope.

[0010] Preferably, the reset assembly includes two connecting plates, two support rods, and several counterweights; the two connecting plates are respectively fixedly connected to the two ends of the flip shaft extending out of the interception chamber, and each connecting plate is fixedly provided with a support rod, and the counterweights are detachably assembled to the ends of the support rods.

[0011] Preferably, the airflow impact mechanism is an air cannon, and the connecting pipe is obliquely connected to the inside of the feeding pipe along the side wall of the feeding pipe, and the air outlet direction of the connecting pipe is perpendicular to the plate surface of the material shut-off valve plate in the blocked state.

[0012] In the above technical solution, this utility model provides a powder feeding mechanism with an air cannon, which has the following beneficial effects: By using a swing-type interception mechanism with a reset component to normally block the feeding port, it prevents high-temperature hot gas from the kiln tail from rising into the feeding pipe, reducing the contact between fusible components such as sulfur, alkali, and chlorine and low-temperature powder, effectively inhibiting the formation of a crust on the inner wall of the pipe; the powder automatically opens the valve to feed by overcoming the reset torque due to its own weight. Combined with the impact airflow output by the airflow impact mechanism, it can both shake off powder adhering to the valve plate and pipe opening, preventing blockage, and also reverse the flow of hot gas rising through the valve gap, reducing hot gas leakage. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0014] Figure 1 A schematic diagram of the overall structure provided for an embodiment of this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the material cutting valve plate provided in an embodiment of the present utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the material cutting valve plate when it is open, provided in an embodiment of the present utility model.

[0017] Figure 4 Provided for the embodiments of this utility model Figure 1 Enlarged view of the structure at point A in the middle.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Feed pipe; 2. Interception chamber; 3. Air cannon; 4. Connecting pipe; 10. Mounting bracket; 11. Shaft seat; 12. Tilting shaft; 13. Cut-off valve plate; 14. Slope; 15. Connecting plate; 16. Support rod; 17. Counterweight; 18. Feed port. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0021] Please see Figure 1-4 The powder feeding mechanism with air cannon 3 is located between the feeding pipe 1 and the kiln tail flue. It includes an interception chamber 2, a swing-type interception mechanism, and an airflow impact mechanism. The upper end of the interception chamber 2 is connected to the feeding port 18 at the lower end of the feeding pipe 1, and the lower end of the interception chamber 2 is used to connect to the kiln tail flue, forming a channel for the powder to flow downward. The swing-type interception mechanism is rotatably mounted in the interception chamber 2 and is provided with an upward reset torque by an external reset component to block the feeding port 18 under normal conditions and prevent the hot air from flowing upward from the kiln tail. The airflow impact mechanism is fixedly installed on the side wall of the feeding pipe 1, and its air outlet extends into the inside of the feeding pipe 1 through the connecting pipe 4 and is set towards the swing-type interception mechanism. During operation, the powder in the feed pipe 1 continuously falls and accumulates on the swing-type interception mechanism. When the downward torque generated by the weight of the powder overcomes the reset torque of the reset component, the swing-type interception mechanism swings downward to open the feed port 18, and the powder falls into the interception chamber 2 and enters the kiln tail smoke chamber. At the same time, the airflow impact mechanism outputs downward impact airflow to shake off the powder adhering to the feed port 18 and the swing-type interception mechanism, while simultaneously counteracting the upward rushing kiln tail hot air, reducing the amount of hot air leakage in the open valve state. While realizing automatic continuous feeding, it suppresses the formation of crust from multiple dimensions such as sealing, cleaning, and airflow obstruction, solving the problems of easy crusting, easy blockage, and frequent cleaning of the existing feed pipe 1.

[0022] Specifically, the swing-type interception mechanism includes a tilting shaft 12, two sets of mounting brackets 10, and two bearing seats 11. The two sets of mounting brackets 10 are symmetrically fixed on the outer walls of both sides of the interception chamber 2. Each mounting bracket 10 is fixedly mounted with a bearing seat 11. The tilting shaft 12 is arranged horizontally, with both ends rotatably passing through the two bearing seats 11, and the middle section of the tilting shaft 12 extends into the internal cavity of the interception chamber 2. By adopting a double-sided external support structure, the rotating pair can be set outside the interception chamber 2, avoiding the harsh working conditions of high temperature and high dust inside the kiln, reducing the impact of high temperature on rotational lubrication, reducing dust abrasive wear, and improving the operational stability and service life of the rotating mechanism.

[0023] Specifically, a material shut-off valve plate 13 is fixedly installed on the middle shaft of the tilting shaft 12. The material shut-off valve plate 13 is located below the discharge port 18 and can swing back and forth synchronously with the tilting shaft 12 to achieve the blocking and opening of the discharge port 18. The material shut-off valve plate 13 is rigidly connected to the tilting shaft 12, which can ensure that the torque transmission is seamless, making the opening and resetting action of the material shut-off valve plate 13 sensitive. After the accumulated material reaches the threshold, the discharge can be opened quickly, and after the material is unloaded, the valve plate can be quickly reset and blocked, shortening the time window for hot air to rise and reducing the contact time between hot air and powder.

[0024] Specifically, the material shut-off valve plate 13 has a frustum-shaped structure, with its conical working surface facing the upward-facing discharge port 18. Correspondingly, the periphery of the discharge port 18 is provided with a conical sealing slope 14 that matches the conical surface of the material shut-off valve plate 13. When the material shut-off valve plate 13 swings upward to the sealing position, its conical surface and the conical sealing slope 14 fit tightly together, forming a circumferential surface seal. The conical surface fitting sealing method has an automatic centering and guiding function. Even if the tilting shaft 12 experiences slight wear and misalignment during long-term operation, the material shut-off valve plate 13 can still fit the sealing surface through the conical surface guidance, avoiding gap leakage caused by misalignment. At the same time, the conical surface fitting extends the length of the upward flow channel for hot gas, forming a labyrinthine blocking effect, further improving the sealing performance, reducing the amount of hot gas leakage, and strengthening the anti-scabbing effect.

[0025] Specifically, the reset assembly includes two connecting plates 15, two support rods 16, and several counterweights 17. The two connecting plates 15 are respectively fixedly connected to the two ends of the tilting shaft 12 extending out of the interception chamber 2. Each connecting plate 15 is fixedly provided with a support rod 16 extending radially outward along the tilting shaft 12. The counterweights 17 are detachably assembled to the outer ends of the support rods 16. The gravity of the counterweights 17 is transmitted to the tilting shaft 12 through the support rods 16 and the connecting plates 15, forming a reset torque that drives the material cut-off valve plate 13 to block the discharge port 18 upward. The symmetrical counterweight layout on both sides ensures that the forces on both ends of the tilting shaft 12 are balanced, avoiding uneven wear and rotational jamming of the shaft seat 11 caused by unilateral force. The counterweight block 17 adopts a detachable design, which can increase or decrease the number of counterweights according to the working conditions such as powder density, moisture content, and feed flow rate, flexibly adjust the magnitude of the reset torque, and accurately set the material accumulation threshold for valve plate opening, adapting to different production conditions. The pure mechanical counterweight structure does not require external power and control components, and has higher reliability, lower failure rate, and lower operation and maintenance costs in the high temperature, high dust, and strong vibration environment of the kiln tail.

[0026] Specifically, the airflow impact mechanism is an air cannon 3. The connecting pipe 4 is obliquely inserted into the inside of the feeding pipe 1 along the side wall of the feeding pipe 1, and the air outlet direction of the connecting pipe 4 is perpendicular to the surface of the material shut-off valve plate 13 in the blocked state. The air outlet angle perpendicular to the surface of the material shut-off valve plate 13 can maximize the impact energy of the pulse airflow on the surface of the valve plate and the periphery of the feeding port 18, improving the material clearing and dispersing efficiency. The high-speed pulse airflow released by the air cannon 3 can achieve multiple functions: First, it can shake off the powder adhering to the surface of the material shut-off valve plate 13 and the inner wall of the feeding port 18, avoiding the long-term retention of powder in contact with the rising hot air to form a crust; Second, when the valve plate is opened, the downward impact force can help push the valve plate downward, avoiding the bridging and jamming of sticky powder, which can lead to insufficient valve plate opening and prevent material blockage; Third, the downward jetting airflow and the upward rising hot air form a reverse counter-impact, which greatly reduces the upward speed and flow rate of hot air at the valve opening gap, reduces the amount of hot air leakage during the valve opening process, and further inhibits the formation of crust.

[0027] Specifically, a high-temperature resistant packing seal structure is installed at the penetration point between the tilting shaft 12 and the side wall of the interception chamber 2. This seal prevents hot air and dust from leaking through the shaft hole gap, further improving the overall sealing performance of the mechanism. The inner diameter of the interception chamber 2 is larger than that of the feed pipe 1, providing ample clearance for the swing of the intercepting valve plate 13 and expanding the diffusion space for falling powder, thus preventing concentrated powder fall and blockage at the bottom of the chamber. In practical applications, the air cannon 3 is configured to be triggered in conjunction with the swing of the valve plate. When the valve plate opens, it sprays air synchronously to clean the material and block the airflow. Under normal conditions, timed air spraying can blow away accumulated material on the inner wall of the feed pipe 1. This is existing technology and will not be elaborated upon. It can prevent the formation of crusts in advance and adapt to different production rhythms.

[0028] Working principle: Under normal conditions, the weight of the counterweight 17 drives the rotating shaft 12 to rotate through the support rod 16 and connecting plate 15, which in turn drives the material shut-off valve plate 13 to swing upward, so that the conical surface tightly fits against the conical sealing slope 14, blocking the discharge port 18 and preventing the high-temperature hot gas from the kiln tail from rushing upward into the discharge pipe 1. This prevents the fusible components such as sulfur, alkali, and chlorine carried by the hot gas from contacting the low-temperature powder and forming a molten adhesive layer. When the powder in the discharge pipe 1 continues to fall and accumulates on the material shut-off valve plate 13, and the downward turning torque generated by the total weight of the powder exceeds the reset torque provided by the counterweight 17, the material shut-off valve plate 13 swings downward with the rotating shaft 12, the discharge port 18 opens, and the powder slides down the valve plate into the interception chamber 2, and finally enters the kiln tail smoke chamber to complete the discharge. As the material shut-off valve plate 13 opens, the air cannon 3 releases a high-speed pulsed airflow, which vertically impacts the surface of the valve plate and the periphery of the discharge port 18, shaking off the adhering powder. At the same time, the downward airflow counteracts the upward-rushing high-temperature hot air, reducing hot air leakage when the valve is open. After the powder is discharged from the material shut-off valve plate 13, the downward turning torque is less than the reset torque. The counterweight 17 drives the flipping shaft 12 to rotate in the opposite direction, and the material shut-off valve plate 13 resets upward, re-sealing the discharge port 18, and entering the next working cycle.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A powder feeding mechanism with an air cannon, located between the feeding pipe (1) and the kiln tail flue, characterized in that, Includes an interception chamber (2), a swing-type interception mechanism, and an airflow impact mechanism; The upper end of the interception chamber (2) is connected to the lower end of the discharge port (18) of the discharge pipe (1); the swing-type interception mechanism is rotatably assembled in the interception chamber (2) and the reset component provides the reset torque to block the discharge port (18) under normal conditions; the airflow impact mechanism is fixed on the side wall of the discharge pipe (1), and its air outlet extends into the discharge pipe (1) through the connecting pipe (4) and faces the swing-type interception mechanism; When the weight of the powder overcomes the reset torque, the swing-type interception mechanism opens the discharge port (18), and the airflow impact mechanism outputs impact airflow to shake off the powder and block the hot air from rising from the kiln tail.

2. The powder feeding mechanism with an air cannon according to claim 1, characterized in that, The swing-type interception mechanism includes a flip shaft (12), two sets of mounting brackets (10) and two bearing seats (11); the two sets of mounting brackets (10) are symmetrically fixed on the outer walls of both sides of the interception chamber (2), and each mounting bracket (10) is fixedly installed with a bearing seat (11). The flip shaft (12) rotates through the two bearing seats (11), and the middle part of the flip shaft (12) extends into the internal cavity of the interception chamber (2).

3. The powder feeding mechanism with an air cannon according to claim 2, characterized in that, A material cutting valve plate (13) is fixedly installed on the middle shaft of the flipping shaft (12).

4. The powder feeding mechanism with an air cannon according to claim 3, characterized in that, The material cut-off valve plate (13) has a frustum-shaped structure. The periphery of the discharge port (18) is provided with a conical sealing slope (14) that matches the conical surface of the material cut-off valve plate (13). When the material cut-off valve plate (13) swings upward to the discharge port (18), its conical surface fits tightly with the conical sealing slope (14).

5. The powder feeding mechanism with an air cannon according to claim 2, characterized in that, The reset assembly includes two connecting plates (15), two support rods (16), and several counterweights (17). The two connecting plates (15) are respectively fixedly connected to the two ends of the flip shaft (12) extending out of the interception chamber (2). Each connecting plate (15) is fixedly provided with a support rod (16), and the counterweights (17) are detachably assembled to the ends of the support rods (16).

6. The powder feeding mechanism with an air cannon according to claim 3, characterized in that, The airflow impact mechanism is an air cannon (3). The connecting pipe (4) is obliquely connected to the inside of the feeding pipe (1) along the side wall of the feeding pipe (1), and the air outlet direction of the connecting pipe (4) is perpendicular to the plate surface of the material cut-off valve plate (13) in the blocked state.

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