Automatic ramming device for large intermediate frequency furnace refractory lining

Abstract

This utility model relates to an automatic tamping device for refractory linings of large medium-frequency furnaces. It includes a positioning cylinder and a tamping mechanism. The positioning cylinder is a cylindrical tube open at both ends, with several ventilation holes on its wall. The tamping mechanism includes a base plate with at least three sets of pneumatic vibrating hammers evenly distributed along its bottom edge. A shaft hole is located at the center of the base plate, and a boss is located at the shaft hole. A gear ring is mounted on the outer ring of the boss. A main shaft is installed inside the shaft hole, and its outer wall is rotatably connected to the base plate via bearings. A through hole is located at the center of the main shaft, and a main air pipe is installed inside the through hole. A rotary joint is connected to the bottom end of the main air pipe, and a branch air pipe is provided at the rotary joint corresponding to each set of pneumatic vibrating hammers. A support plate is provided on the upper outer wall of the main shaft, and a drive motor is mounted on the support plate. A drive gear is mounted on the output end of the drive motor, meshing with the gear ring. A lifting connector is provided at the top of the main shaft. This utility model improves work efficiency and ensures the quality of the refractory lining.

Description

Technical Field

[0001] This utility model relates to the field of medium frequency furnace manufacturing, specifically an automatic tamping device for the refractory lining of large medium frequency furnaces. Background Technology

[0002] Medium frequency furnaces are a common type of heating furnace in the metallurgical industry. Their structure mainly consists of an outer shell and a refractory lining. A medium frequency induction device is installed between the outer shell and the refractory lining. The refractory lining is in direct contact with the high-temperature molten metal, therefore its service life directly affects the service life of the medium frequency furnace. The refractory lining must be dense and free of metallic impurities during manufacturing; otherwise, voids can easily form, causing localized weaknesses, which can lead to molten steel leakage accidents in severe cases. To ensure the refractory lining is dense, the refractory material needs to be tamped tightly during manufacturing. Currently, this tamping is mainly done manually, which is inefficient and prone to omissions, making it difficult to guarantee quality. Summary of the Invention

[0003] The purpose of this invention is to solve the problems existing in the prior art and to provide an automatic tamping device for the refractory lining of a large medium-frequency furnace.

[0004] The specific solution of this utility model is as follows: an automatic tamping device for refractory lining of a large medium-frequency furnace, comprising a positioning cylinder and a tamping mechanism. The positioning cylinder is a cylindrical tube open at both ends, and the cylinder wall is provided with several ventilation holes. The tamping mechanism includes a base plate, at least three sets of pneumatic vibrating hammers are evenly distributed on the bottom edge of the base plate, a shaft hole is provided at the center of the base plate, a boss is provided at the shaft hole, a gear ring is installed on the outer ring of the boss, a main shaft is installed in the shaft hole, the outer wall of the main shaft is rotatably connected to the base plate through a bearing, a through hole is provided at the center of the main shaft, a main air pipe is installed in the through hole, a rotary joint is connected to the bottom end of the main air pipe, and a branch air pipe is provided at the rotary joint corresponding to each set of pneumatic vibrating hammers. A support plate is provided on the upper outer wall of the main shaft, a drive motor is installed on the support plate, a drive gear is installed at the output end of the drive motor, the drive gear meshes with the gear ring, and a connecting piece for lifting is provided at the top of the main shaft.

[0005] Furthermore, a frustum is provided at the top of the main shaft, the support plate is fixedly connected to the outer wall of the frustum, and three connecting parts are evenly distributed on the top surface of the frustum around the outer periphery of the main air pipe.

[0006] Furthermore, a counterweight is provided on the outer wall of the frustum on the other side of the support plate, and the counterweight is used to keep the center of gravity located at the center of the substrate.

[0007] Furthermore, the connector is a lifting ring or a bolt.

[0008] Furthermore, a connecting plate is fixedly mounted on the top of the outer shell of the pneumatic vibratory hammer, and a locking bolt is mounted on the connecting plate. A waist-shaped hole is provided on the base plate corresponding to each group of pneumatic vibratory hammers. The locking bolt passes through the corresponding waist-shaped hole to lock the pneumatic vibratory hammer to the base plate.

[0009] Furthermore, a limiting plate is provided at the bottom end of the spindle, and the size of the limiting plate is larger than the shaft hole.

[0010] This invention has the following advantages: it realizes the all-round automatic tamping of the refractory lining of the medium frequency furnace, replacing manual operation, greatly improving work efficiency, and ensuring the quality of the refractory lining. Attached Figure Description

[0011] Figure 1 This is a three-dimensional schematic diagram of the structure of this utility model;

[0012] Figure 2 yes Figure 1 Top view;

[0013] Figure 3 This is a three-dimensional view of the tamping mechanism of this utility model;

[0014] Figure 4 This is a schematic diagram of the working state of this utility model;

[0015] Figure 5 yes Figure 4 AA view;

[0016] In the diagram: 1. Positioning cylinder; 2. Tamping mechanism; 21. Base plate; 22. Pneumatic vibratory hammer; 23. Waist-shaped hole; 24. Locking bolt; 25. Connecting plate; 26. Air distribution pipe; 27. Rotary joint; 28. Bearing; 29. ​​Limiting plate; 210. Gear ring; 211. Drive gear; 212. Motor; 213. Main shaft; 214. Main air pipe; 215. Frustum; 3. Base liner; 4. Side liner; 5. Connector; 6. Hook; 7. Lifting rope. Detailed Implementation

[0017] See Figure 1-5This embodiment describes an automatic tamping device for the refractory lining of a large medium-frequency furnace. It includes a positioning cylinder 1 and a tamping mechanism 2. The positioning cylinder 1 is a cylindrical tube open at both ends, with several ventilation holes on its wall. The tamping mechanism 2 includes a base plate 21. At least three sets of pneumatic vibrating hammers 22 are evenly distributed along the bottom edge of the base plate 21. A shaft hole is located at the center of the base plate 21, and a boss is provided at the shaft hole. A gear ring 210 is mounted on the outer ring of the boss. A main shaft 213 is installed inside the shaft hole, and the outer wall of the main shaft 213 is connected to the base plate 21 via a bearing 28. The main shaft 213 is rotatably connected, with a through hole at its center. A main air pipe 214 is installed in the through hole, and a rotary joint 27 is connected to the bottom end of the main air pipe 214. The rotary joint 27 is provided with a branch air pipe 26 for each group of pneumatic vibrating hammers 22. A support plate is provided on the upper outer wall of the main shaft 213, and a drive motor 212 is installed on the support plate. A drive gear 211 is installed at the output end of the drive motor 212. The drive gear 211 meshes with the gear ring 210. A connecting piece 5 for lifting is provided at the top of the main shaft 213.

[0018] During operation, the drive motor 212 drives the drive gear 211, which in turn drives the base plate 21 and each set of pneumatic vibrating hammers 22 to rotate. The speed of the drive motor 212 is set within a reasonable speed range.

[0019] Compressed gas is supplied through the main air pipe 214 to the rotary joint 27 and then to each branch air pipe 26, thereby driving each group of pneumatic vibratory hammers 22 to work.

[0020] Furthermore, the top end of the main shaft 213 is provided with a frustum 215, the support plate is fixedly connected to the outer wall of the frustum 215, and three connecting pieces 5 are evenly distributed on the top surface of the frustum 215 on the outer periphery of the main air pipe 214.

[0021] Furthermore, a counterweight is provided on the outer wall of the frustum 215 on the other side of the support plate, and the counterweight is used to make the center of gravity located at the center of the base plate 21.

[0022] Furthermore, the connecting member 5 is a lifting ring or bolt. In use, a crane or gantry crane is used to drive three lifting ropes 7 through the hook 6, and each lifting rope 7 is connected and fixed to the connecting member 5.

[0023] Furthermore, a connecting plate 25 is fixedly mounted on the top of the outer shell of the pneumatic vibrating hammer 22. A locking bolt 24 is mounted on the connecting plate 25. A waist-shaped hole 23 is provided on the base plate 21 corresponding to each group of pneumatic vibrating hammers 22. The locking bolt 24 passes through the corresponding waist-shaped hole 23 to lock the pneumatic vibrating hammer 22 to the base plate 21.

[0024] In actual use, the installation position of the pneumatic vibratory hammer 22 is adjusted according to the positioning cylinder 1 by setting the waist-shaped hole 23, so that the hammer head of each group of pneumatic vibratory hammers 22 can contact the inner wall of the positioning cylinder 1.

[0025] Furthermore, a limiting plate 29 is provided at the bottom end of the main shaft 213, and the size of the limiting plate 29 is larger than the shaft hole.

[0026] In actual use, the refractory lining is divided into a bottom lining 3 and a side lining 4. After the bottom lining 3 is laid, the existing tools are used to tap and vibrate the bottom lining 3 to compact it before the side lining 4 is installed. The specific operation steps are as follows: First, place the positioning cylinder 1 so that the positioning cylinder 1 is concentric with the center of the furnace body. At this time, there is a gap between the outer wall of the positioning cylinder 1 and the inner wall of the furnace body.

[0027] The second step is to evenly pour refractory material into the gap, and then pause after pouring to a certain height.

[0028] The third step is to use a crane or trolley to lift the tamping mechanism 2 into the positioning cylinder 1 and lower the tamping mechanism 2 to the lowest point of the positioning cylinder 1.

[0029] The fourth step is to start the drive motor 212 and each pneumatic vibrating hammer 22. The drive motor 212 drives the base plate 21 to rotate around its own center at a certain speed. At the same time, each pneumatic vibrating hammer 22 strikes the inner wall of the positioning cylinder 1 at a high frequency.

[0030] Fifth, after tamping each layer for a certain period, the tamping mechanism 2 is raised to a certain height to tamp the second layer. After tamping the second layer, another layer of refractory material is poured in, and then the tamping mechanism 2 is raised to tamp the next layer. This process is repeated layer by layer, tamping each layer as it is poured in, ensuring that each layer of refractory material is compacted until the top layer is reached. Finally, the induction furnace is turned on, heating the furnace to a high temperature. The refractory materials bond and harden at this high temperature, ultimately forming a complete refractory lining. The positioning cylinder 1 is then melted into molten steel and poured out. This completes the fabrication of the refractory lining for the induction furnace.

[0031] During each layer of vibration, most of the air in the refractory material's internal voids is expelled upwards, while a small portion of the air can be expelled through the pores on the wall of the positioning cylinder 1.

[0032] The dimensions of the base plate 21 and the positioning cylinder 1 of this utility model are pre-made according to the furnace body size and the thickness of the refractory lining. For furnace bodies and refractory linings of different sizes, it is necessary to make a tamping mechanism 2 and a positioning cylinder 1 of corresponding size.

Claims

1. An automatic ramming device for the refractory lining of large intermediate frequency furnaces, characterized in that: The device includes a positioning cylinder and a tamping mechanism. The positioning cylinder is a cylindrical tube open at both ends, with several air holes on its wall. The tamping mechanism includes a base plate with at least three sets of pneumatic vibratory hammers evenly distributed along its bottom edge. The base plate has a shaft hole at its center, with a boss at the shaft hole and a gear ring around the boss. A main shaft is installed inside the shaft hole, and its outer wall is rotatably connected to the base plate via bearings. The main shaft has a through hole at its center, with a main air pipe installed inside. A rotary joint is connected to the bottom of the main air pipe, and a branch air pipe is provided at the rotary joint for each set of pneumatic vibratory hammers. A support plate is provided on the upper outer wall of the main shaft, with a drive motor mounted on the support plate. A drive gear is installed at the output end of the drive motor, meshing with the gear ring. A lifting connector is provided at the top of the main shaft.

2. The automatic ramming device for the refractory lining of large medium-frequency furnaces according to claim 1, characterized in that: The top of the main shaft is provided with a truncated cone section, the support plate is fixedly connected to the outer wall of the truncated cone, and three connecting parts are evenly distributed on the top surface of the truncated cone around the outer periphery of the main air pipe.

3. The automatic ramming device for the refractory lining of large medium-frequency furnaces, according to claim 2, characterized in that: The outer wall of the frustum is provided with a counterweight on the other side of the support plate. The counterweight is used to keep the center of gravity at the center of the base plate.

4. The automatic ramming device for the refractory lining of large medium-frequency furnaces, according to claim 2, characterized in that: The connectors are either eyelets or bolts.

5. The automatic ramming device for refractory lining of large-sized intermediate frequency furnace according to claim 1, characterized in that: A connecting plate is fixedly mounted on the top of the outer shell of the pneumatic vibratory hammer. The connecting plate is equipped with locking bolts. A waist-shaped hole is provided on the base plate corresponding to each group of pneumatic vibratory hammers. The locking bolts pass through the corresponding waist-shaped holes to lock the pneumatic vibratory hammers to the base plate.

6. The automatic ramming device for refractory lining of large-sized intermediate frequency furnace according to claim 1, characterized in that: A limiting plate is provided at the bottom of the spindle, and the size of the limiting plate is larger than the shaft hole.

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