Quick material ramming device for vacuum induction furnace

Abstract

This utility model belongs to the field of vacuum induction furnace equipment, and particularly relates to a rapid tamping device for a vacuum induction furnace. It includes a tamping rod, a fastening device, an outer seal, an inner seal, and a tamping hammer. The fastening device is connected to a furnace opening on the furnace shell via the outer seal, and an inner seal is provided at the furnace opening. The bottom end of the tamping rod is connected to the tamping hammer. The fastening device is connected to a flange on the furnace opening via a hinge. The fastening device is a quick-release clamp structure. The outer seal is a rubber sleeve structure, with flanges connected to both ends of the rubber sleeve. Compared with the prior art, the advantages of this utility model are: it can handle "bridging" and "material sticking" phenomena without disrupting the vacuum during the smelting process by rotating and raising the tamping rod and using the tamping hammer; it is particularly suitable for vacuum induction furnaces; manual operation allows for controllable striking force, which helps protect the crucible from excessive damage during tamping, thus preventing reduced lifespan or even steel leakage.

Description

Technical Field

[0001] This utility model belongs to the field of vacuum induction furnace equipment, and in particular relates to a rapid material compaction device for vacuum induction furnaces. Background Technology

[0002] In the process of smelting steel or alloys in a vacuum induction furnace, during the melting period of the liquid metal, the material above the crucible fails to continue descending into the liquid metal and separates from it, a phenomenon known as "bridging." Bridging interrupts the melting process and requires immediate intervention with a tamping device. During the melting process, splashing also occurs, especially towards the end of melting, where splashed molten metal condenses on top of the liquid metal in the crucible, a phenomenon called "sticking." Sticking cannot be resolved by tilting or repositioning the crucible, or by powering off the furnace. Sticking affects subsequent charging operations and the accuracy of the final steel composition, as well as the charging operation for the next heat of steel, also requiring immediate intervention with a tamping device.

[0003] The conventional handling methods are: 1) Stop vacuum melting, break the vacuum, and open the furnace lid for impact treatment. This method will destroy the vacuum environment, causing the molten steel surface to come into contact with oxygen in the atmosphere, which will have a significant impact on the subsequent smelting process. 2) Immediately use a tamping device during the melting process to tamp the "bridging" and "sticky" areas. The original tamping device is similar to a straight rod, which is difficult to control the accurate position of the material being tamped during use, and the tamping force is small. At the same time, the tamping force will act on the crucible, which can easily cause the crucible to crack or even leak steel, causing accidents. In addition, if the tamping rod falls into the molten steel at the point of impact, it will melt in the molten steel, causing damage to the tamping device and deviations in the composition of the molten steel.

[0004] Chinese utility model patent CN 217275528 U discloses a material bridging removal device for a vacuum induction furnace, comprising: a melting crucible installed in a melting chamber; a corrugated pipe fixed to the melting chamber via a flange; a drive mechanism installed above the corrugated pipe; the drive mechanism drives a tamping rod to rotate the material in the melting crucible; an observation window above the melting chamber allows on-site workers to easily monitor the melting status in the furnace in real time, control the direction and depth of the tamping rod into the crucible, and move the tamping rod without breaking the vacuum. Through the corrugated pipe and spherical mechanism, the tamping rod's trajectory within the melting crucible can be flexibly adjusted from 0-60°, forcibly disrupting the distribution of solid materials "bridging" at the top of the molten metal pool, causing the irregular solid materials to fall into the molten metal, thus eliminating the "bridging" formed by the cross-linking of solid materials. The drawback of this solution is that using a motor-driven method to handle "sticky steel" or residue makes it difficult to control the impact point and force, and can easily damage the crucible.

[0005] Chinese invention patent CN113441727A discloses a vacuum melting gas atomizing furnace and its tamping and slag-removing device, including a lifting component; a tamping component connected to the lifting component; an anti-slip positioning component fixed outside the lifting rod; a core frame including: a main outer sleeve fitted around the lifting component; a first sealing plate facing the second end face of the main outer sleeve; a dynamic sealing mechanism including a positioning inner sleeve, a first dynamic sealing component, and a second dynamic sealing component, the positioning inner sleeve being disposed inside the main outer sleeve, and the first and second dynamic sealing components being spaced apart in the annular space between the lifting component and the positioning inner sleeve; and a movable sleeve, one end fixed to the first sealing plate and the other end extending beyond the main outer sleeve. This device has a complex structure and is only suitable for tamping operations in vacuum atomizing furnaces, but its effect on handling "sticky steel" with high adhesion strength is not ideal. Utility Model Content

[0006] The purpose of this invention is to provide a rapid tamping device for vacuum induction furnaces, which overcomes the shortcomings of existing technologies. It can quickly solve the problems of "bridging" and "sticking" and the residue on the inner wall of the crucible without destroying the vacuum during the steelmaking process in a vacuum induction furnace. It has a simple structure, is easy to operate, and the striking force is controllable. It can protect the crucible from excessive damage due to tamping, which may affect its lifespan or even cause steel leakage.

[0007] To achieve the above objectives, this utility model employs the following technical solution:

[0008] A rapid tamping device for a vacuum induction furnace includes a tamping rod, a fastening device, an outer seal, an inner seal, and a tamping hammer. The top of the tamping rod is connected to a handle. The fastening device is connected to a furnace opening on the furnace shell via the outer seal. An inner seal is provided at the furnace opening. The bottom end of the tamping rod is connected to the tamping hammer via a tamping joint. The fastening device is connected to a flange on the furnace opening via a hinge frame. The hinge frame includes a hinge seat, a vertical rod, a first pin, a second pin, and a horizontal rod. The hinge seat is fixedly connected to the flange on the furnace opening. The bottom end of the vertical rod is movably connected to the hinge seat via the first pin. The top end of the vertical rod is movably connected to one end of the horizontal rod via the second pin. The other end of the horizontal rod is fixedly connected to the fastening device. The fastening device is a quick-release clamp structure. The outer seal is a rubber sleeve structure, with flanges connected to both ends of the rubber sleeve.

[0009] Furthermore, the tamping hammer and the tamping rod have an included angle of 15-30°.

[0010] Furthermore, the tamping joint and the tamping rod are an integral structure.

[0011] Furthermore, the tamping hammer head and the tamping joint are connected by threads.

[0012] Furthermore, the tamping hammer head is a shovel-shaped body, smaller at the top and larger at the bottom, with a flat or arc-shaped bottom.

[0013] Furthermore, the height of the outer seal is 80-150mm, and the wall thickness is 30-50mm.

[0014] Furthermore, the inner seal is a rubber sealing ring.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1) During the smelting process, the tamping rod can be rotated and raised, and the tamping hammer can be used to deal with the "bridging" and "sticking" phenomena without destroying the vacuum. It is especially suitable for vacuum induction furnaces.

[0017] 2) The tamping hammer is a shovel head that is smaller at the top and larger at the bottom, and the lower end is at a certain angle to the tamping rod. This makes it easier to apply downward force while dealing with the "bridging" phenomenon, and makes it easier to deal with the "sticky material" phenomenon above the liquid surface in the crucible, reducing the difficulty of operation for personnel.

[0018] 3) Manual operation allows for controllable striking force, which helps protect the crucible and prevents it from cracking due to excessive lateral impact during material handling, thus avoiding impact on crucible lifespan or even steel leakage.

[0019] 4) It avoids the problems of weak and inaccurate striking power of small round bar hammers, and can handle problems quickly and efficiently. It is not easy to come into contact with molten steel, so it is not easy to get stuck with steel, and the hammer head is less damaged by the melting of molten steel. Attached Figure Description

[0020] Figure 1 This is a structural diagram of an embodiment of the present utility model;

[0021] Figure 2 This is a schematic diagram of the force exerted by the tamping hammer in an embodiment of this utility model;

[0022] Figure 3 This is a schematic diagram of the connection structure of the tamping hammer head in an embodiment of this utility model.

[0023] In the diagram: 1-Handle, 2-Tapping rod, 3-Fastening device, 4-Outer seal, 5-Inner seal, 6-Furnace shell, 7-Furnace hole, 8-Tapping joint, 9-Tapping hammer, 10-Hinge, 11-Upright rod, 12-Pin one, 13-Pin two, 14-Horizontal bar, 15-Rubber sleeve, 16-Flange, 17-Hinge frame. Detailed Implementation

[0024] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the specific embodiments used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some embodiments of this utility model. For those skilled in the art, other specific embodiments can be obtained based on these specific embodiments without creative effort.

[0026] The components of the present invention described and shown in the specific embodiments herein can be arranged and designed in numerous different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0027] See Figure 1-3 This is a schematic diagram of an embodiment of a rapid tamping device for a vacuum induction furnace according to this utility model. It includes a tamping rod 2, a fastening device 3, an outer seal 4, an inner seal 5, and a tamping hammer 9. The top of the tamping rod 2 is connected to a handle 1. The fastening device 3 is connected to a furnace hole 7 on the furnace shell 6 via the outer seal 4. An inner seal 5 is provided at the furnace hole 7. The bottom end of the tamping rod 2 is connected to the tamping hammer 9 via a tamping joint 8. The fastening device 3 is connected to a flange on the furnace hole 7 via a hinge 17. 17 includes a hinge seat 10, a vertical rod 11, a first pin 12, a second pin 13, and a horizontal rod 14. The hinge seat 10 is fixedly connected to the flange on the furnace hole 7. The bottom end of the vertical rod 11 is movably connected to the hinge seat 10 through the first pin 12. The top of the vertical rod 11 is movably connected to one end of the horizontal rod 14 through the second pin 13. The other end of the horizontal rod 14 is fixedly connected to the fastening device 3. The fastening device 3 is a quick-release clamp structure. The outer seal 4 is a rubber sleeve structure. The two ends of the rubber sleeve 15 are respectively connected to the flange 16.

[0028] For ease of operation, the tamping hammer head 9 and the tamping rod 2 have an included angle of 120°-170° and are fixed by set screws, with 150° being the preferred angle. The tamping connector 8 and the tamping rod 2 are an integral structure to prevent accidental detachment. The tamping hammer head 9 and the tamping connector 8 are connected by threads and fixed with set screws. The tamping hammer head 9 is a shovel-shaped body, smaller at the top and larger at the bottom, with either a flat or curved bottom, depending on the requirements. The shovel shape is significantly different from the original round rod shape, expanding the shoveling range. The outer seal 4 has a height of 80-150mm and a wall thickness of 30-50mm. It has a certain degree of elasticity, providing low resistance to the tamping rod 2 during operation and exhibiting a large degree of deformation, allowing the tamping rod 2 to swing and move within a wide range. The inner seal 5 is a rubber sealing ring, forming another seal for the tamping rod 2 to ensure no vacuum leakage.

[0029] The operator can manipulate the tamping device's swinging and rotating motion, as well as its own rotation, using a handle outside the furnace, enabling the device to rotate and rise within the vacuum induction furnace. The outer seal 4 and inner seal 5 ensure airtightness during operation. The furnace opening 7 provides space for the tamping rod to swing and move.

[0030] The fastening device 3 is located above the outer seal 4, surrounds the tamping rod and is fastened to prevent it from automatically falling down due to gravity when not in use.

[0031] In this embodiment, the tamping device is installed before operation. The angles of the tamping rod 2 and the tamping hammer are adjusted according to the position of the furnace hole 7 and the crucible, ensuring the tamping hammer is perpendicularly downward. This design ensures that the force applied during tamping is downward, minimizing impact on the crucible and preventing damage. When "bridging" or "sticking" is observed inside the furnace through the observation hole on the furnace body, the smelting power is first turned off. The operator loosens the fastening device 3 outside the furnace to ensure the normal up-and-down movement of the tamping rod 2. The operator moves the tamping rod 1 downwards, left, or right to the "bridging" or "sticking" location, aligning the tamping hammer 9 with the desired tamping position. The operator manually applies downward force or uses a hammer or other tool to strike the top of the handle 1, constantly observing the tamping effect. Once the tamping operation is complete, the tamping rod is immediately raised to the predetermined position by operating the handle 1, and the fastening device is locked to prevent the tamping rod from descending.

[0032] This invention enables material tamping during smelting without disrupting the vacuum by using a rotating and lifting tamping device. It overcomes the difficulties of tamping, which can easily damage the crucible, reduces the difficulty of operation, and protects the crucible from damage due to excessive lateral force during tamping, thus preventing damage to its lifespan or even steel leakage. It also provides high efficiency in handling such problems.

[0033] 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 rapid material compaction device for a vacuum induction furnace, characterized in that, The device includes a tamping rod, a fastening device, an outer seal, an inner seal, and a tamping hammer. The top of the tamping rod is connected to a handle. The fastening device is connected to a furnace opening on the furnace shell via an outer seal. An inner seal is provided at the furnace opening. The bottom end of the tamping rod is connected to the tamping hammer via a tamping joint. The fastening device is connected to a flange on the furnace opening via a hinge frame. The hinge frame includes a hinge seat, a vertical rod, a first pin, a second pin, and a horizontal bar. The hinge seat is fixedly connected to the flange on the furnace opening. The bottom end of the vertical rod is movably connected to the hinge seat via a first pin. The top end of the vertical rod is movably connected to one end of the horizontal bar via a second pin. The other end of the horizontal bar is fixedly connected to the fastening device. The fastening device is a quick-release clamp structure. The outer seal is a rubber sleeve structure, with flanges connected to both ends of the rubber sleeve.

2. A quick material ramming device for vacuum induction furnace as claimed in claim 1, wherein, The tamping hammer and the tamping rod have an included angle of 120°-170°.

3. A quick material ramming device for vacuum induction furnace as claimed in claim 1 wherein, The tamping joint and the tamping rod are an integral structure.

4. A quick material ramming device for vacuum induction furnace as claimed in claim 1, wherein, The tamping hammer and the tamping joint are connected by threads.

5. A rapid material stirring device for a vacuum induction furnace according to claim 1, characterized in that, The tamping hammer is a shovel-shaped object that is smaller at the top and larger at the bottom, with a flat or arc-shaped bottom.

6. A quick material ramming device for vacuum induction furnace as claimed in claim 1, wherein, The height of the outer seal is 80-150mm, and the wall thickness is 30-50mm.

7. A quick material ramming device for vacuum induction furnace as claimed in claim 1, wherein, The inner seal is a rubber sealing ring.

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