Mechanical arch breaking device for vertical coal ash steel storage tank

Abstract

The utility model relates to a mechanical arch breaking device for a vertical coal ash steel storage tank. In order to solve the technical problem, the vertical coal ash steel storage tank mechanical arch breaking device comprises a vertical stock bin and a stirrer, the vertical stock bin comprises a cylinder part and a cone part which are connected up and down, a discharge port is formed in the lower end of the cone part, the stirrer comprises a speed reducing motor and a stirring shaft, the stirring shaft is arranged in the vertical stock bin, and the speed reducing motor is connected with the stirring shaft. A plurality of stirring rods are arranged on the stirring shaft, the stirring shaft is obliquely arranged in the cone part, a sealing box is additionally arranged at the lower part of the barrel body part, the speed reducing motor is fixed on the sealing box, and an output shaft of the speed reducing motor extends into the sealing box and is connected with the stirring shaft in the sealing box. The vertical mechanical arch breaking device for the coal ash steel storage tank is simple in structure, reliable in use and suitable for being used in various enterprises needing to use large bins, such as thermal power plants, coal preparation plants, cement plants and the like.

Description

Technical Field

[0001] The utility model relates to a mechanical arch-breaking device for a vertical fly ash steel storage tank. Background Art

[0002] Sometimes, fly ash in a vertical storage tank may become blocked due to certain reasons, resulting in problems such as wall sticking, arching and bridging, and rat holes. Once these problems occur, the fly ash pulping system cannot operate normally, causing certain economic losses and safety hazards to the coal mine grouting for fire prevention and extinguishment.

[0003] To prevent the occurrence of blockage problems in vertical fly ash storage tanks, conventional treatment methods include knocking type, jet type, and vibration type. The knocking type arch-breaking equipment usually has two types: magnet type pneumatic hammer and valve body type pneumatic hammer. The magnet type pneumatic hammer forms knocking through the force of magnet separation. Since the force of the magnet is fixed and unchangeable, the knocking force cannot be adjusted during use; the valve body type pneumatic hammer forms knocking by the energy storage and release of the cylinder body, and the knocking force can be adjusted according to the air pressure during use. The jet type arch-breaking equipment must open holes in the vertical storage tank, and the fly ash is directly in contact with the air, which is prone to cause fly ash caking due to the moisture in the air. The vibration type arch-breaking equipment drives the vibration of the material through a high-frequency vibration, thereby increasing the voids between particles and reducing the mutual force to achieve the effect of increasing the fluidity of the material. However, it has a large wear during use and needs to be lubricated with oil regularly.

[0004] A Chinese utility model patent with the authorization announcement date of July 23, 2024, and the announcement number of CN 221395160 U discloses an anti-blocking silo, which includes a silo body, a stirrer, an air cannon, and a vibration motor. The stirrer is arranged inside the silo body and is used for stirring powder materials. The air cannon is arranged at the bottom of the silo body and is used for dispersing the powder materials. The vibration motor is arranged at the top of the silo body and is used for driving the silo body to vibrate. The beneficial effect of the utility model is that it effectively avoids the blockage of the silo, ensures normal feeding, has a simple structure, and is convenient to operate. The stirrer includes a rotating shaft and stirring blades. The rotating shaft is arranged perpendicular to the height of the silo body (the rotating shaft is horizontally arranged), and the stirring blades are arranged along the rotating shaft.

[0005] If a silo with such a structure is used as a pulverized coal silo, the rotating shaft of the stirrer lying across the silo itself also constitutes an obstacle to the pulverized coal feeding. The prior art urgently needs a mechanical arch-breaking device for a vertical fly ash steel storage tank. Summary of the Invention

[0006] The technical problem to be solved by the utility model is how to overcome the above defects of the prior art and provide a mechanical arch-breaking device for a vertical fly ash steel storage tank.

[0007] To solve the above technical problems, the mechanical arch-breaking device for the vertical fly ash steel storage tank of the present invention includes a vertical silo and a stirrer. The vertical silo includes a cylindrical part and a conical part, which are connected up and down. The lower end of the conical part is provided with a discharge port. The stirrer includes a reduction motor and a stirring shaft. The stirring shaft is arranged in the vertical silo and is driven by the reduction motor. A plurality of stirring rods are arranged on the stirring shaft. It is characterized in that: a lower bearing seat is arranged on the inner wall of the conical part above the discharge port, and a seal box is arranged on one side at the junction of the cylindrical part and the conical part. The lower part of the seal box obliquely extends into the vertical silo, and the upper part thereof is exposed outside the vertical silo. Through holes opposite to each other are respectively opened on the bottom plate and the top plate of the seal box, and shaft seal sleeves are respectively arranged on each through hole. The reduction motor is fixed on the top plate of the seal box. The output shaft of the reduction motor passes through the through hole and the shaft seal sleeve on the top plate of the seal box and extends into the seal box; a bearing is sleeved on the lower end of the stirring shaft, and the bearing is fixed on the lower bearing seat. The other end of the stirring shaft passes through the through hole and the shaft seal sleeve on the bottom plate of the seal box and extends into the seal box, and is connected to the output shaft of the reduction motor through a coupling. With such a design, as Figure 1 shown, the stirring shaft is obliquely arranged in the conical part, and the obstruction of the stirring shaft itself to the falling of the powder is minimized. When the material in the vertical silo is sufficient but the material at the discharge port is not flowing smoothly, most likely, an arch structure or a rat hole structure has appeared in the material inside the vertical silo. At this time, start the reduction motor to drive the stirring shaft to rotate. The stirring rods on the stirring shaft will loosen the surrounding powder, and the arch structure formed by the surrounding material can be quickly broken.

[0008] As an optimization, both ends of the stirring shaft are closed and hollow. Air inlet holes are also arranged on the side wall of the stirring shaft in the seal box. Each stirring rod is composed of a hollow spray pipe and is communicated with the inside of the stirring shaft. A spray pipe is also arranged on the exposed side wall of the seal box. A valve is arranged on the spray pipe and is communicated with a matched high-pressure air supply pipe. When the humidity of the pulverized coal is high, there may also be a problem that the stirrer rotates continuously, the material in the vertical silo is sufficient, but the material at the discharge port is not flowing smoothly. At this time, most likely, a hole (commonly known as a rat hole) structure has appeared around the stirring shaft. At this time, only open the valve on the spray pipe, and the high-pressure air enters the seal box through the spray pipe, enters the inside of the stirring shaft from the air inlet hole, and finally sprays out from each hollow spray pipe. With such a design, the sprayed high-pressure air can loosen a larger range of powder and destroy the rat hole structure, and timely dredge the material discharge of the vertical silo. To avoid blowing out dust by the high-pressure air, the valve on the spray pipe should not be opened for a long time. It can be opened only for 8 - 10 seconds for purging when necessary, and of course, it can also be opened and closed at intervals.

[0009] As an optimization, a one-way jet nozzle is respectively arranged at the outer end of each hollow spray pipe. With such a design, it can prevent the material from blocking the hollow spray pipe and affecting the arch-breaking and hole-breaking effects.

[0010] The mechanical arch-breaking device of this vertical fly ash steel storage tank has a simple structure, reliable operation, and is not prone to material blockage. Even if blockage occurs, it can be quickly eliminated, making it suitable for enterprises such as thermal power plants, coal preparation plants, and cement plants that require the use of large silos. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The following further describes the mechanical arch-breaking device of this practical vertical fly ash steel storage tank in conjunction with the drawings:

[0012] Figure 1 It is a partial sectional structure schematic diagram of the mechanical arch-breaking device of this vertical fly ash steel storage tank (in the figure, only the plane passing through the axis of the stirring shaft and the center line of the air injection pipe is used to perform a partial sectioning of the sealing box and part of the air injection pipe).

[0013] In the figure: 1 is the cylindrical part, 2 is the conical part, 3 is the discharge port, 4 is the reduction motor, 5 is the stirring shaft, 6 is the stirring rod, 7 is the lower bearing seat, 8 is the sealing box, 81 is the bottom plate of the sealing box, 82 is the top plate of the sealing box, 9 is the coupling, 41 is the output shaft of the reduction motor 4, 10 is the air inlet hole, 11 is the air injection pipe, and 12 is the valve. SPECIFIC EMBODIMENTS

[0014] Embodiment 1: As Figure 1 shown, the mechanical arch-breaking device of this vertical fly ash steel storage tank includes a vertical silo and a stirrer. The vertical silo includes a cylindrical part 1 and a conical part 2, which are connected up and down. The lower end of the conical part 2 is provided with a discharge port 3. The stirrer includes a reduction motor 4 and a stirring shaft 5. The stirring shaft 5 is arranged in the vertical silo and is driven by the reduction motor 4. A plurality of stirring rods 6 are provided on the stirring shaft. It is characterized in that: a lower bearing seat 7 is provided on the inner wall of the conical part 2 above the discharge port 3. A sealing box 8 is provided on one side at the connection of the cylindrical part 1 and the conical part 2. The lower part of this sealing box 8 obliquely extends into the vertical silo, and its upper part is exposed outside the vertical silo. Through holes are respectively opened on the bottom plate 81 and the top plate 82 of this sealing box 8, and shaft sealing sleeves (not shown in the figure) are respectively provided on each through hole. The reduction motor 4 is fixed on the top plate 82 of the sealing box 8. The output shaft 41 of the reduction motor 4 passes through the through hole on the top plate 82 of the sealing box 8 and the shaft sealing sleeve (not shown in the figure, omitted), and extends into the sealing box 8; the lower end of the stirring shaft 5 is sleeved with a bearing, and this bearing is fixed on the lower bearing seat 7. The other end of the stirring shaft 5 passes through the through hole on the bottom plate 81 of the sealing box 8 and the shaft sealing sleeve, extends into the sealing box 8, and is connected to the output shaft 41 of the reduction motor 4 through a coupling 9.

[0015] Both ends of the stirring shaft 5 are closed and hollow. An air inlet hole 10 is also provided on the side wall of the stirring shaft 5 in the sealing box 8. Each stirring rod 6 is composed of a hollow spray pipe and communicates with the inside of the stirring shaft 5. An air spray pipe 11 is also provided on the exposed side wall of the sealing box 8. A valve 12 is provided on the air spray pipe 11 and communicates with a matched high-pressure air supply pipe (not shown in the figure, omitted).

[0016] A one-way air jet nozzle (not shown in the figure, omitted) is respectively provided at the outer end of each hollow spray pipe. The one-way air jet nozzle can select the one-way high-speed gas jet nozzle described in CN115350824B or simply adopt a basketball valve core type one-way valve.

Claims

1. A mechanical arch breaking device for a vertical fly ash steel storage tank, comprising a vertical silo and a stirrer, wherein the vertical silo comprises a cylindrical body and a conical body, which are connected up and down, and a discharge port is arranged at the lower end of the conical body, and the stirrer comprises a reduction motor and a stirring shaft, wherein the stirring shaft is arranged in the vertical silo and driven by the reduction motor, and a plurality of stirring rods are arranged on the stirring shaft, and the characteristics are as follows: A lower bearing seat is provided on the inner wall of the cone portion above the discharge port, and a sealing box is provided at the lower part of the cylinder portion. The lower part of the sealing box obliquely extends into the vertical silo, and the upper part thereof is exposed outside the vertical silo. Opposite through holes are respectively opened on the bottom plate and the top plate of the sealing box, and each through hole is respectively provided with a shaft sealing sleeve. The reduction motor is fixed on the top plate of the sealing box, and the output shaft of the reduction motor extends into the sealing box through the through hole and the shaft sealing sleeve on the top plate of the sealing box; the lower end of the stirring shaft is sleeved with a bearing, and the bearing is fixed on the lower bearing seat, and the other end of the stirring shaft extends into the sealing box through the through hole and the shaft sealing sleeve on the bottom plate of the sealing box, and is connected to the output shaft of the reduction motor through a coupling.

2. The mechanical arch breaking device for a vertical fly ash steel storage tank according to claim 1 is characterized in that: The stirring shaft is closed at both ends and hollow inside. An air inlet hole is provided on the side wall of the stirring shaft in the sealed box. Each stirring rod is composed of a hollow nozzle and is connected to the inside of the stirring shaft. An air jet pipe is also provided on the exposed side wall of the sealed box. The air jet pipe is provided with a valve and is connected to a high-pressure air supply pipe.

3. The mechanical arch breaking device for a vertical fly ash steel storage tank according to claim 2 is characterized in that: A one-way air jet nozzle is respectively arranged at the outer end of each hollow nozzle.

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