Detachable taphole stem structure for blast furnace ironmaking

Abstract

The application discloses a detachable mud gun rotating shaft structure for blast furnace ironmaking, and the rotating shaft structure comprises a top plate, a bottom plate, a rotating shaft and a shaft sleeve liner matched with the rotating shaft. The top plate is provided with a cover plate structure for detachably mounting the rotating shaft. The cover plate structure is connected with the top plate through fasteners, and a matched connecting part is arranged between the cover plate structure and the top plate, and the matched connecting part is preferably a taper matched hole, so that the cover plate structure and the top plate are tightly connected. The two ends of the rotating shaft are connected with the cover plate structure and the bottom plate through the shaft sleeve liner respectively. The rotating shaft can be taken out or mounted from one side of the top plate by detaching the cover plate structure. The structure adopts an upper assembly form, can realize on-line short-time and high-efficiency replacement of the rotating shaft or the shaft sleeve liner, greatly improves the maintenance and replacement time, and effectively improves the performance of the mud gun equipment.

Description

Technical Field

[0001] This utility model belongs to the field of iron and steel smelting equipment technology, and in particular relates to a detachable mud gun shaft structure for blast furnace ironmaking. Background Technology

[0002] Blast furnace ironmaking is a crucial step in modern steel production, and the mud gun is one of the key pieces of equipment for tapping iron in a blast furnace, primarily used for plugging the taphole. The core function of the mud gun lies in its rotating mechanism, which uses a hydraulic cylinder to drive the gun body to rotate via upper and lower steel plates at both ends of the rotating shaft, thus achieving accurate taphole plugging. This device needs to operate for extended periods and at high frequency during ironmaking, and its performance and reliability directly affect the stability and efficiency of blast furnace production.

[0003] During the long-term operation of mud guns, the rotating shaft and bushings of their rotating mechanism inevitably experience wear or damage. As wear intensifies, the precision deviation between the muzzle and the taphole increases, leading to difficulties in sealing the muzzle. When wear or damage exceeds a certain limit, maintaining production or performing repairs may require replacing the entire mud gun, adopting single-tap tapping, or even halting production altogether. However, replacing existing shafts or bushings often requires disassembling the mud gun, which is difficult to perform on-site and hinders rapid replacement, thus impacting normal production. Therefore, designing a new device with a simple structure, easy on-site maintenance, and the ability to quickly replace the shaft or bushing is a pressing issue in current blast furnace ironmaking equipment technology. Utility Model Content

[0004] To address the problems of difficulty in replacing worn mud gun shafts and bushings in existing technologies, which affects normal production, this utility model provides a detachable mud gun shaft structure for blast furnace ironmaking.

[0005] This utility model is implemented as follows: a detachable mud gun rotating shaft structure for blast furnace ironmaking, used to connect the top plate, bottom plate, and rotating cylinder of the mud gun. The rotating shaft structure includes a rotating shaft and a bushing bushing fitted on the rotating shaft. The key feature is that: a cover plate structure for detachably installing the rotating shaft is provided on the top plate; the cover plate structure is connected to the top plate by fasteners; a mating connection is provided between the cover plate structure and the top plate, which achieves a tight fit when the two are connected, and after the cover plate structure is removed, the rotating shaft can be disassembled and installed through holes in the top plate; both ends of the rotating shaft are connected to the cover plate structure and the bottom plate respectively through the bushing bushing.

[0006] In the above technical solution, preferably, the mating connection part is a tapered mating hole disposed between the top plate and the cover plate structure.

[0007] In the above technical solution, preferably, the diameter of the tapered fitting hole on the top plate is larger than the shoulder width on the rotating shaft in the disassembly direction.

[0008] In the above technical solution, preferably, the cover plate structure is a detachable cover plate, and the fastener is a fastening bolt.

[0009] In the above technical solution, preferably, the rotating shaft is a hydraulic cylinder rotating shaft, which is provided with a hydraulic cylinder shaft hole for connection with the rotary cannon hydraulic cylinder.

[0010] In the above technical solution, preferably, the bushing bushing is a self-lubricating bushing bushing.

[0011] In the above technical solution, preferably, the structure adopts an upper assembly form.

[0012] The detachable mud gun shaft structure designed in this technical solution for blast furnace ironmaking adopts an upper assembly form, realizing a simple and convenient replacement structure and providing convenience for short-term maintenance and replacement. The structure is simple in design, facilitating maintenance and replacement. The implementation of this device can greatly improve maintenance and replacement time, enabling on-demand replacement and avoiding prolonged difficulties or accidents caused by wear of the drive shaft and bushings. This structure can greatly improve reliability and accuracy, laying the foundation for stable blast furnace production. This structure possesses high efficiency and simplicity. Simultaneously, it allows for online, short-term, and efficient replacement of the hydraulic cylinder shaft or self-lubricating bushing, effectively improving the performance of the mud gun equipment. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0015] To address the shortcomings of existing technologies, this utility model provides a detachable mud gun shaft structure for blast furnace ironmaking. To further illustrate the structure of this utility model, a detailed description is provided below in conjunction with the accompanying drawings: Please see Figure 1 This embodiment describes a detachable mud gun shaft structure for blast furnace ironmaking. This structure adopts an upper assembly form and is designed as a detachable device for easy and convenient replacement. The structure has good stability and uses a tapered fit for a tight connection.

[0016] The detachable rotating shaft structure includes a top plate 1, a bottom plate 2, a rotating shaft 3, and a bushing 4 that mates with the rotating shaft. Specifically, the rotating shaft is a hydraulic cylinder rotating shaft, which has a hydraulic cylinder shaft hole 5 for connecting to a rotary cannon cylinder. The bushing is specifically a self-lubricating bushing.

[0017] The top plate is provided with a cover plate structure for detachably mounting the rotating shaft, specifically a detachable cover plate 6. The detachable cover plate is connected to the top plate by fasteners, specifically fastening bolts 7. The fastening bolts are preferably evenly distributed to ensure uniform and reliable connection.

[0018] The detachable cover plate and the top plate are provided with a mating connection part, which is specifically realized through a tapered mating hole 8. The tapered mating hole can ensure that the detachable cover plate and the top plate are tightly mated. Furthermore, due to the self-locking or near-self-locking characteristics of the tapered fit, it can still maintain a certain connection stability when the fastening bolts are loose, which improves the operational reliability and vibration resistance of the entire structure. It is especially suitable for heavy-load and impact conditions such as blast furnace mud guns.

[0019] The tapered fit achieves a tight connection and resistance to loosening by utilizing the principles of inclined planes and friction: when a removable cover plate with a tapered base is pressed down into a tapered hole on the top plate using bolts, this wedging action generates strong lateral (radial) pressure between the two tapered surfaces, thus completely eliminating any gaps between them and achieving a high-precision, high-rigidity tight fit. More importantly, if the slope (angle) of this tapered surface is designed to be gentle enough, the friction between the tapered surfaces will be greater than any axial force attempting to push the cover plate out, producing a self-locking or near-self-locking effect. This means that even if the fixing bolts loosen due to vibration, the strong friction of the tapered surface itself can firmly "hold" the cover plate to the top plate, significantly improving the stability and operational reliability of the entire mud gun shaft structure under severe working conditions.

[0020] One end of the cylinder shaft passes through the detachable cover plate and the top plate, while the other end is connected to the bottom plate. Both ends of the cylinder shaft are connected to the detachable cover plate and the bottom plate respectively via self-lubricating bushings. The use of self-lubricating bushings effectively reduces friction between the shaft and the bushing, lowers the wear rate, and extends the service life of both the shaft and the bushing. Simultaneously, the self-lubricating properties reduce the need for lubrication maintenance, thereby lowering the maintenance intensity and cost at the blast furnace site.

[0021] To facilitate the installation and disassembly of the hydraulic cylinder shaft, the tapered fitting hole on the top plate is designed to be larger than the shoulder width of the hydraulic cylinder shaft. When disassembling the hydraulic cylinder shaft, first disassemble the rotary drum hydraulic cylinder to remove it from the cylinder shaft hole of the hydraulic cylinder shaft. Then, remove the fastening bolts fixed to the removable cover plate and remove the removable cover plate. At this point, the hydraulic cylinder shaft can be removed from the tapered fitting hole on the top plate, and the hydraulic cylinder shaft or the self-lubricating bushing can be replaced. The replacement process is performed in reverse order. This top-assembly structure greatly simplifies the replacement steps, enabling convenient on-site replacement of the shaft or bushing, avoiding the difficulty of disassembling the mud gun required for traditional shaft or bushing replacement, thus significantly shortening maintenance time and laying the foundation for stable blast furnace production. Furthermore, this top-assembly and disassembly design concentrates the operating space at the top, making it easier to utilize on-site lifting equipment for auxiliary operations, further improving replacement efficiency and operational safety.

[0022] 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 and improvements 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 detachable mud gun rotating shaft structure for blast furnace ironmaking, used to connect the top plate, bottom plate, and rotating cylinder of the mud gun, the rotating shaft structure comprising a rotating shaft and a bushing bushing fitted on the rotating shaft, characterized in that: The top plate is provided with a cover plate structure for detaching and installing the rotating shaft; the cover plate structure is connected to the top plate by fasteners; a mating connection part is provided between the cover plate structure and the top plate, which achieves a tight fit when the two are connected, and after the cover plate structure is removed, the rotating shaft can be disassembled and installed through the holes on the top plate; both ends of the rotating shaft are connected to the cover plate structure and the bottom plate respectively through the bushing bushing.

2. The detachable mud gun shaft structure for blast furnace ironmaking according to claim 1, characterized in that: The mating connection is a tapered mating hole provided between the top plate and the cover plate structure.

3. The detachable mud gun shaft structure for blast furnace ironmaking according to claim 2, characterized in that: The diameter of the tapered fitting hole on the top plate is larger than the shoulder width on the rotating shaft in the corresponding disassembly direction.

4. The detachable mud gun shaft structure for blast furnace ironmaking according to claim 1, characterized in that: The cover plate structure is a detachable cover plate, and the fastener is a fastening bolt.

5. The detachable mud gun shaft structure for blast furnace ironmaking according to claim 1, characterized in that: The rotating shaft is a hydraulic cylinder rotating shaft, which has a hydraulic cylinder shaft hole for connecting with the rotating cannon hydraulic cylinder.

6. The detachable mud gun shaft structure for blast furnace ironmaking according to claim 1, characterized in that: The bushing bushing is a self-lubricating bushing bushing.

7. The detachable mud gun shaft structure for blast furnace ironmaking according to claim 1, characterized in that: The structure adopts an upper assembly form.

Images