A production process and equipment for magnesia-carbon bricks

Abstract

This invention relates to the field of refractory materials, and provides a production process and equipment for magnesia-carbon bricks, including a main frame. The upper surface of the main frame is provided with a coating structure, which includes a rotary motor, a rotary motor, and a coating frame. The main components of the magnesia-carbon bricks of this invention are periclase particles, graphite powder, atactic polypropylene modified bitumen, silicon carbide particles, and aluminum powder. By using the combination of rotary motors one and two, and with the design of a brush and an adjustable rotation structure, the brush can repeatedly coat the magnesia-carbon brick mold, and the angle and range of the coating can be directly controlled, thereby improving the coating uniformity and coating thickness, and enhancing the high-temperature resistance of the magnesia-carbon bricks.

Description

Technical Field

[0001] This invention relates to the field of refractory materials, specifically to a production process and equipment for magnesia-carbon bricks. Background Technology

[0002] Magnesia-carbon bricks are refractory products made primarily from magnesia and graphite. They have low apparent porosity and excellent resistance to slag erosion, molten slag penetration, thermal shock stability, and thermal conductivity. They are mainly used in oxygen converters for steelmaking, high-power and ultra-high-power electric arc furnaces, and ladle refining furnaces. However, because magnesia-carbon bricks contain graphite and phenolic resin binders that are easily oxidized at high temperatures, they are prone to carbon oxidation after baking at temperatures exceeding 1000 degrees Celsius, resulting in a significant decarburized layer. This leads to a loose material structure and reduced strength. Under the influence of molten slag erosion and mechanical scouring, the magnesium oxide particles are gradually melted, detached, and damaged. Currently, the most convenient measure to improve these problems is to coat the fire-facing surface of the magnesia-carbon bricks with a refractory layer.

[0003] Chinese Patent Publication No. CN112979281A discloses a production apparatus and process for high-temperature resistant magnesia-carbon bricks. This invention involves placing magnesia-carbon brick raw materials into a pressing mold box, machine-pressing them to obtain magnesia-carbon brick blanks, and then applying refractory coating to the fire-facing surface of the magnesia-carbon brick blanks using a coating roller. Specifically, after the pressing mold box rotates 90 degrees and aligns with a vertical feeding box, a driving cylinder simultaneously pushes out the mold box bottom plate and the coating roller. The mold box bottom plate then pushes the magnesia-carbon brick blank into the vertical feeding box. During the process of the pressing mold box moving backward and resetting, the coating roller applies the refractory coating to the fire-facing surface of the magnesia-carbon brick blank. Throughout the entire process from pressing to final drying and firing, the contact between the magnesia-carbon brick blank and the surface of the magnesia-carbon brick blank is avoided, thus improving the quality of the magnesia-carbon brick blank. However, this invention only uses the coating roller to contact the fire-facing surface of the magnesia-carbon brick blank for roller coating, which easily leads to uneven coating and a relatively shallow coating thickness.

[0004] In summary, the present invention provides a production process and equipment for magnesia-carbon bricks to solve the above-mentioned problems. Summary of the Invention

[0005] This invention provides a production process and equipment for magnesia-carbon bricks. By using a combination of rotary motor one and rotary motor two, and with the use of a brush and an adjustable rotating structure design, the brush can repeatedly coat the magnesia-carbon brick mold, thereby solving the problems of uneven coating and shallow coating thickness in the prior art.

[0006] A magnesia-carbon brick production device includes a main frame. A coating structure is provided on the upper surface of the main frame. The coating structure includes a rotary motor, a rotary motor, and a coating frame. The coating frame is snap-fitted to the main frame. The top end of the rotary motor is fixedly connected to the main frame. A rotating plate is fixedly connected to the output end of the rotary motor. A rotating plate is rotatably connected below the rotating plate. A rotating plate is rotatably connected to the end of the rotating plate away from the rotating plate. A brush is provided at the bottom of the rotating plate. A rotating plate is rotatably connected to the end of the rotating plate away from the rotating plate. A gear is fixedly connected to the upper end of the rotating plate. A gear is meshed with the side of the gear. The rotary motor is located below the gear and connected to the main frame. The output end of the rotary motor is fixedly connected to the gear. A conveyor belt is located below the brush and connected to the main frame. A magnesia-carbon brick mold is located above the conveyor belt.

[0007] In a preferred embodiment, the bottom end of the second rotating plate is rotatably connected to the main frame, and the end of the fourth rotating plate away from the third rotating plate is rotatably connected to the first rotating plate.

[0008] In a preferred embodiment, the rotating shaft of the first gear is rotatably connected to the first rotating plate.

[0009] In a preferred embodiment, the size of the paint frame matches the size of the brush, and one side of the outer frame edge of the paint frame is provided with a bevel for the brush to pass through. The brush is used to coat the magnesia-carbon bricks.

[0010] In a preferred embodiment, a limiting block is provided on one side of the rotating plate two. The limiting block is rotatably connected to the main frame. A notch is provided on the surface of the rotating plate two near the limiting block, and the size of the notch is larger than the size of the limiting block. The limiting block allows the rotating plate two to rotate only within a small range.

[0011] In a preferred embodiment, a filling structure is provided on the side of the conveyor belt away from the brush. The filling structure includes a drive motor, a threaded column, and a mixing tank. The drive motor is located on the side of the conveyor belt and is fixedly connected to the main frame. The threaded column is fixedly connected to the output end of the drive motor, and the rotation shaft of the threaded column is rotatably connected to the main frame. A mixing tank is located on the side of the threaded column. A threaded stirring rod is threadedly connected to the middle of the mixing tank. A knob is fixedly connected to the top of the threaded stirring rod. A stirring plate is fixedly connected to the side of the threaded stirring rod. A leak-proof plug is fixedly connected to the bottom of the threaded stirring rod. A gear is located below the mixing tank. The mixing tank is used to stir the magnesia-carbon brick raw materials.

[0012] In a preferred embodiment, the bottom of the mixing tank is provided with a filling hole that matches the size of the anti-leakage plug, the size of the magnesia-carbon brick mold box matches the size of the filling hole, the thread of the threaded column meshes with the tooth pattern of the gear three, and the filling hole allows the magnesia-carbon brick raw material in the mixing tank to fall downward into the magnesia-carbon brick mold box.

[0013] This invention also provides a production process for magnesia-carbon bricks, comprising the following steps:

[0014] Step 1: Crush an appropriate amount of periclase particles, graphite powder, atactic polypropylene modified asphalt, silicon carbide particles and aluminum powder into fine particles, and then pour them into a mixing tank in a weight ratio of 7.5:1.8:0.3:0.1:0.1. Start the drive motor to make the mixing tank rotate and stir. After stirring evenly, the raw material for magnesia-carbon bricks is obtained.

[0015] Step 2: Mix 20% epoxy resin, 5% phenolic resin, 5% xylene, 5% diluent, 5% curing agent, 1% curing agent additive, 1% sodium tungstate, and 10% titanium dioxide evenly to obtain an antioxidant coating. Pour the antioxidant coating into a coating container for later use.

[0016] Step 3: Start the conveyor belt and place the magnesia-carbon brick mold box on it. After the magnesia-carbon brick mold box moves to the bottom of the mixing tank, stop the conveyor belt and turn the knob to let the magnesia-carbon brick raw material fall into the magnesia-carbon brick mold box. After filling to the appropriate capacity, turn the knob in the opposite direction to stop filling, and you will get a magnesia-carbon brick mold box containing magnesia-carbon brick raw material.

[0017] Step 4: Press down the limit block to start the rotary motor one, so that the brush rotates to the top of the paint frame. After the brush is fully coated with anti-oxidation paint, it rotates in the opposite direction to reset. Then, reset the limit block upwards, stop the rotary motor one, and start the rotary motor two to make the brush rotate slightly on the conveyor belt. Then, start the conveyor belt to move the magnesium carbon brick mold box below the brush. The brush repeatedly applies anti-oxidation paint to the surface of the magnesium carbon brick raw material in the magnesium carbon brick mold box until the magnesium carbon brick mold box leaves the movement range of the brush.

[0018] Step 5: Remove the magnesia-carbon brick mold from the conveyor belt and place it into a vacuum degassing brick press. After degassing under vacuum, press the molded magnesia-carbon brick into shape. Then, place the pressed magnesia-carbon brick into a 110°C dryer to dry. After drying, the finished magnesia-carbon brick is obtained.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This invention utilizes a combination of two rotary motors, along with a brush and an adjustable rotating structure, to allow the brush to repeatedly coat the magnesia-carbon brick mold. The angle and range of the coating can be directly controlled, thereby improving the uniformity and thickness of the coating and enhancing the high-temperature resistance of the magnesia-carbon brick. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the coating structure of the present invention.

[0023] Figure 3 This is a schematic diagram showing the disassembly of the coating structure of the present invention.

[0024] Figure 4 This is a schematic diagram of the three disassemblies of the rotating plate of the present invention.

[0025] Figure 5 This is a schematic diagram of the filling structure of the present invention.

[0026] Figure 6 This is a schematic diagram of the disassembly of the filling structure of the present invention.

[0027] In the picture:

[0028] 1. Main frame; 2. Coating structure; 3. Filling structure; 4. Conveyor belt; 5. Magnesia-carbon brick mold box; 21. Rotary motor one; 22. Rotating plate one; 23. Rotating plate two; 24. Rotating plate three; 25. Rotating plate four; 26. Paint frame; 231. Limiting block; 241. Brush; 251. Gear one; 271. Gear two; 31. Drive motor; 32. Threaded column; 33. Mixing tank; 331. Knob; 332. Threaded stirring rod; 333. Gear three; 334. Mixing plate; 335. Leak-proof plug. Detailed Implementation

[0029] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0030] like Figure 1-6As shown, the present invention provides a magnesia-carbon brick production equipment, including a main frame 1. A coating structure 2 is provided on the upper surface of the main frame 1. The coating structure 2 includes a rotary motor 21, a rotary motor 27, and a coating frame 26. The coating frame 26 is snap-fitted onto the main frame 1. The top end of the rotary motor 21 is fixedly connected to the main frame 1. A rotating plate 22 is fixedly connected to the output end of the rotary motor 21. A rotating plate 23 is rotatably connected below the rotating plate 22. A rotating plate 24 is rotatably connected to the end of the rotating plate 23 away from the rotating plate 22. A brush 241 is provided at the bottom of the rotating plate 24. A rotating plate 25 is rotatably connected to the end away from the rotating plate 23. A gear 251 is fixedly connected to the upper end of the rotating plate 25. A gear 271 is meshed with the side of the gear 251. A rotary motor 27 is located below the gear 271 and connected to the main frame 1. The output end of the rotary motor 27 is fixedly connected to the gear 271. A conveyor belt 4 is located below the brush 241 and is connected to the main frame 1. A magnesia-carbon brick mold box 5 is located above the conveyor belt 4. The magnesia-carbon brick mold box 5 is used to store magnesia-carbon brick raw materials. The brush 241 is used to coat the magnesia-carbon brick raw materials in the magnesia-carbon brick mold box 5.

[0031] In one embodiment of the present invention, the bottom end of the second rotating plate 23 is rotatably connected to the main frame 1, and the end of the fourth rotating plate 25 away from the third rotating plate 24 is rotatably connected to the first rotating plate 22.

[0032] In one embodiment of the present invention, the rotating shaft of the gear 251 is rotatably connected to the rotating plate 22.

[0033] In one embodiment of the present invention, the size of the paint frame 26 is matched with the size of the brush 241. One side of the outer frame edge of the paint frame 26 is provided with an inclined surface for the brush 241 to pass through. When the brush 241 passes through the inclined surface, some of the impurities remaining on the brush 241 can be left on the inclined surface.

[0034] As one embodiment of the present invention, a limiting block 231 is provided on one side of the rotating plate 23. The limiting block 231 is rotatably connected to the main frame 1. A notch is opened on the surface of the rotating plate 23 near the limiting block 231, and the size of the notch is larger than the size of the limiting block 231. After the top of the limiting block 231 enters the notch, the rotating plate 23 can only rotate within a small range.

[0035] In one embodiment of the present invention, a filling structure 3 is provided on the side of the conveyor belt 4 away from the brush 241. The filling structure 3 includes a drive motor 31, a threaded column 32, and a mixing tank 33. The drive motor 31 is located on the side of the conveyor belt 4 and is fixedly connected to the main frame 1. The threaded column 32 is fixedly connected to the output end of the drive motor 31. The rotating shaft of the threaded column 32 is rotatably connected to the main frame 1. A mixing tank 33 is provided on the side of the threaded column 32. A threaded stirring rod 332 is threadedly connected to the middle of the mixing tank 33. A knob 331 is fixedly connected to the top of the threaded stirring rod 332. A stirring plate 334 is fixedly connected to the side of the threaded stirring rod 332. A leak-proof plug 335 is fixedly connected to the bottom of the threaded stirring rod 332. A gear 333 is provided below the mixing tank 33. The mixing tank 33 can hold magnesium carbon brick raw materials and stir them.

[0036] In one embodiment of the present invention, the bottom of the mixing tank 33 is provided with a filling hole that matches the size of the anti-leakage plug 335, the size of the magnesia-carbon brick mold 5 matches the size of the filling hole, the thread of the threaded column 32 meshes with the tooth of the gear 333, and the magnesia-carbon brick raw material in the mixing tank 33 can fall into the magnesia-carbon brick mold 5 from the filling hole.

[0037] This invention also provides a production process for magnesia-carbon bricks, comprising the following steps:

[0038] Step 1: Crush an appropriate amount of periclase particles, graphite powder, atactic polypropylene modified asphalt, silicon carbide particles and aluminum powder into fine particles, and then pour them into mixing tank 33 in a weight ratio of 7.5:1.8:0.3:0.1:0.1. Start the drive motor 31 to make the mixing tank 33 rotate and stir. After stirring evenly, the raw material for magnesia-carbon bricks is obtained.

[0039] Step 2: Mix 20% epoxy resin, 5% phenolic resin, 5% xylene, 5% diluent, 5% curing agent, 1% curing agent additive, 1% sodium tungstate, and 10% titanium dioxide evenly to obtain an antioxidant coating. Pour the antioxidant coating into the coating container 26 for later use.

[0040] Step 3: Start the conveyor belt 4 and place the magnesium carbon brick mold box 5 on it. After the magnesium carbon brick mold box 5 moves through the conveyor belt 4 to the bottom of the mixing tank 33, stop the conveyor belt 4 and turn the knob 331 to let the magnesium carbon brick raw material fall into the magnesium carbon brick mold box 5. After filling to the appropriate capacity, turn the knob 331 in the opposite direction to stop filling, and you will get the magnesium carbon brick mold box 5 containing the magnesium carbon brick raw material.

[0041] Step 4: Press down on the limit block 231 to start the rotary motor 21, so that the brush 241 rotates above the paint frame 26. After the brush 241 is fully coated with anti-oxidation paint, it rotates in the opposite direction to reset. Then, the limit block 231 is reset upward, the rotary motor 21 is stopped, and the rotary motor 27 is started, so that the brush 241 rotates slightly on the conveyor belt 4. Then, the conveyor belt 4 is started, so that the magnesium carbon brick mold box 5 moves below the brush 241. The brush 241 repeatedly applies anti-oxidation paint to the surface of the magnesium carbon brick raw material in the magnesium carbon brick mold box 5 until the magnesium carbon brick mold box 5 leaves the movement range of the brush 241.

[0042] Step 5: Remove the magnesia-carbon brick mold 5 from the conveyor belt 4 and place it into a vacuum degassing brick press. After degassing under vacuum, press the brick into shape. Then, place the pressed magnesia-carbon brick into a dryer at 110°C to dry. After drying, the finished magnesia-carbon brick is obtained.

[0043] Specific working principle:

[0044] When the drive motor 31 starts, the threaded column 32 fixedly connected to the drive motor 31 rotates synchronously, thereby driving the gear 333 that meshes with the thread of the threaded column 32 to rotate, which in turn causes the mixing tank 33 fixedly connected above the gear 333 to rotate, thereby achieving the effect of rotating and stirring the magnesium carbon brick raw material in the mixing tank 33.

[0045] Then, the drive motor 31 is stopped, and the automatic locking function of the drive motor 31 is used to prevent the threaded column 32 fixedly connected to the drive motor 31 from continuing to rotate, thereby stopping the movement of the mixing tank 33 and restricting the rotation of the mixing tank 33. Then, the knob 331 is turned so that the threaded stirring rod 332 can rotate upward relative to the mixing tank 33, thereby causing the anti-leakage plug 335 at the bottom of the threaded stirring rod 332 to move upward, and then causing the magnesia-carbon brick raw material in the mixing tank 33 to fall into the magnesia-carbon brick mold box 5 through the opening of the mixing tank 33.

[0046] When the rotary motor 21 is started, the rotating plate 22 is driven to rotate synchronously. At the same time, since the rotating plate 22 is rotatably connected to the rotating plate 25, the rotating plate 25 is rotatably connected to the rotating plate 24, and the rotating plate 24 is rotatably connected to the rotating plate 23, the rotation of the rotating plate 22 can drive the rotating plate 24 to move. When the limiting block 231 is pressed away from the notch of the rotating plate 23, the rotating plate 22 can drive the rotating plate 24 to rotate at a large angle, so that the rotating plate 24 moves above the paint frame 26, and then the brush 241 slides along the inclined surface of the paint frame 26 and enters the interior of the paint frame 26, so that the brush 241 is covered with anti-oxidation paint.

[0047] When the limiting block 231 and the rotating plate 23 are reset, the top of the limiting block 231 enters the notch of the rotating plate 23, so that the rotating plate 23 can only rotate within a small range, thereby reducing the range of rotation of the rotating plate 22 driven by the rotary motor 21. When the rotary motor 21 drives the rotating plate 22 to rotate, and the gear 251 rotates to the position of meshing with the gear 271, the rotary motor 21 is stopped and the rotary motor 27 is started. At this time, the automatic locking function of the rotary motor 21 prevents the rotating plate 22 from rotating. The rotary motor 27 drives the gear 271 to rotate, and the gear 251 meshing with the gear 271 rotates synchronously. Thus, the rotating plate 24 is affected by the gear 251 fixedly connected above and rotates back and forth within a small range, thereby achieving the effect of the brush 241 repeatedly applying paint on the magnesium carbon brick mold box 5.

[0048] Compared with the problems of uneven coating and shallow coating thickness in the prior art, the present invention uses the combination of rotary motor 21 and rotary motor 27, and the brush 241 and adjustable rotation structure design to allow the brush 241 to repeatedly coat the magnesia-carbon brick mold box 5. At the same time, the angle and range of coating can be directly controlled, thereby improving the coating uniformity and coating thickness, and enhancing the high temperature resistance of the magnesia-carbon brick.

[0049] The embodiments of the present invention are given for the purposes of illustration and description. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A production equipment for magnesia-carbon bricks, characterized in that, The system includes a main frame (1), the upper surface of which is provided with a coating structure (2). The coating structure (2) includes a rotary motor (21), a rotary motor (27), and a paint frame (26). The paint frame (26) is snapped onto the main frame (1). The top end of the rotary motor (21) is fixedly connected to the main frame (1). A rotating plate (22) is fixedly connected to the output end of the rotary motor (21). A rotating plate (23) is rotatably connected below the rotating plate (22). A rotating plate (24) is rotatably connected to the end of the rotating plate (23) away from the rotating plate (22). The bottom of the rotating plate (24) is provided with a coating structure (27). A brush (241) is rotatably connected to a rotating plate four (25) at one end of the rotating plate three (24) away from the rotating plate two (23). A gear one (251) is fixedly connected to the upper end of the rotating plate four (25). A gear two (271) is meshed with the side of the gear one (251). A rotary motor two (27) is located below the gear two (271) and connected to the main frame (1). The output end of the rotary motor two (27) is fixedly connected to the gear two (271). A conveyor belt (4) is located below the brush (241) and is connected to the main frame (1). A magnesium carbon brick mold box (5) is located above the conveyor belt (4). A filling structure (3) is provided on the side of the conveyor belt (4) away from the brush (241). The filling structure (3) includes a drive motor (31), a threaded column (32), and a mixing tank (33). The drive motor (31) is located on the side of the conveyor belt (4) and is fixedly connected to the main frame (1). The threaded column (32) is fixedly connected to the output end of the drive motor (31). The rotating shaft of the threaded column (32) is rotatably connected to the main frame (1). A mixing tank (33) is provided on the side of the threaded column (32). A threaded stirring rod (332) is threadedly connected to the middle of the mixing tank (33). A knob (331) is fixedly connected to the top of the threaded stirring rod (332). A stirring plate (334) is fixedly connected to the side of the threaded stirring rod (332). A leak-proof plug (335) is fixedly connected to the bottom of the threaded stirring rod (332). A gear three (333) is provided below the mixing tank (33).

2. The magnesia-carbon brick production equipment as described in claim 1, characterized in that, The bottom end of the second rotating plate (23) is rotatably connected to the main frame (1), and the end of the fourth rotating plate (25) away from the third rotating plate (24) is rotatably connected to the first rotating plate (22).

3. The magnesia-carbon brick production equipment as described in claim 1, characterized in that, The rotating shaft of the gear one (251) is rotatably connected to the rotating plate one (22).

4. The magnesia-carbon brick production equipment as described in claim 1, characterized in that, The size of the paint frame (26) matches the size of the brush (241), and one side of the outer frame edge of the paint frame (26) is provided with a bevel for the brush (241) to pass through.

5. The magnesia-carbon brick production equipment as described in claim 1, characterized in that, A limiting block (231) is provided on one side of the rotating plate two (23). The limiting block (231) is rotatably connected to the main frame (1). A notch is provided on the surface of the rotating plate two (23) near the limiting block (231), and the size of the notch is larger than the size of the limiting block (231).

6. The magnesia-carbon brick production equipment as described in claim 1, characterized in that, The bottom of the mixing tank (33) is provided with a filling hole that matches the size of the leak-proof plug (335). The size of the magnesium carbon brick mold box (5) matches the size of the filling hole. The thread of the threaded column (32) meshes with the tooth pattern of the gear three (333).

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