Copper liquid chute device

Abstract

The utility model relates to the technical field of smelting devices, in particular to a molten copper chute device which comprises a chute body, the chute body comprises a U-shaped base and a U-shaped refractory brick, the U-shaped refractory brick is arranged in the U-shaped base, and the U-shaped refractory brick is provided with a drainage groove; the U-shaped refractory brick comprises a first brick body and a plurality of second brick bodies, the first brick body and the second brick bodies are sequentially placed in the U-shaped base, the adjacent first brick body and second brick body are in contact, and every two adjacent second brick bodies are in contact. According to the molten copper chute device, the overall brick joints of the U-shaped refractory bricks are few, the integrity and the thermal shock resistance are good, when the U-shaped refractory bricks on the chute body convey high-temperature molten copper, the risk of molten copper leakage is effectively reduced, and the situation that after long-term use, refractory materials of the U-shaped refractory bricks are scoured and taken away by the high-temperature molten copper, and consequently weak spots are generated can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of smelting equipment technology, specifically to a copper liquid sluice box device. Background Technology

[0002] In copper smelting, sluice boxes are required to transport molten copper. Because molten copper reaches temperatures as high as 1200℃ and has strong scouring properties, it is prone to damaging existing sluice boxes, leading to leakage through weak points and disrupting normal production. Leakage can also cause injury to personnel and damage to equipment. Therefore, a new type of molten copper sluice box is urgently needed to solve these problems. Utility Model Content

[0003] To address the technical problem of copper molten material leakage risk in existing chute devices, this invention provides a copper molten material chute device. The first and second bricks are integrally formed, and the U-shaped refractory brick is composed of the first brick and multiple second bricks. During use, adjacent first and second bricks and adjacent second bricks are tightly fitted together. Compared with the existing method of stacking refractory bricks one by one, this significantly reduces the number of brick joints. The U-shaped refractory brick has fewer brick joints, better integrity and thermal shock resistance. When conveying high-temperature copper molten material, the U-shaped refractory brick effectively reduces the risk of copper molten material leakage and also prevents the refractory material of the U-shaped refractory brick from being washed away by the high-temperature copper molten material after long-term use, thus avoiding weak points.

[0004] This utility model provides a copper liquid chute device, including a chute body, the chute body including a U-shaped base and a U-shaped refractory brick, the U-shaped refractory brick being disposed inside the U-shaped base, the U-shaped refractory brick having a drain groove; the U-shaped refractory brick including a first brick body and a plurality of second brick bodies, the first brick body and the plurality of second brick bodies being placed sequentially inside the U-shaped base, adjacent first brick bodies and second brick bodies as well as two adjacent second brick bodies being in contact.

[0005] Furthermore, the width of the left end of the first brick is greater than the width of the right end of the first brick, and the width of the second brick is the same as the width of the right end of the first brick; the sidewall of the left end of the first brick includes a first inclined surface and a second inclined surface, the inclination of the first inclined surface being less than the inclination of the second inclined surface; the sidewall of the right end of the first brick includes a third inclined surface and a fourth inclined surface, the inclination of the third inclined surface being less than the inclination of the second inclined surface; the sidewall of the second brick includes a fifth inclined surface and a sixth inclined surface, the inclination of the fifth inclined surface being less than the inclination of the sixth inclined surface. The fact that the inclinations of the first and third inclined surfaces are less than the inclination of the second inclined surface facilitates the removal of slag from the first brick by workers. Similarly, workers can easily remove slag from the second brick.

[0006] Furthermore, the copper liquid chute device also includes a cover plate and a fumigation assembly. One end of the cover plate is hinged and rotated on one side of the top of the U-shaped base. The cover plate is located above the drain trough. The other end of the cover plate forms a gap between the top of the U-shaped refractory brick and the other side of the top of the U-shaped base. The fumigation assembly includes a frame, a U-shaped hood movably mounted on the frame, and an induced draft fan and a housing mounted on the frame. The frame is located on the side of the chute body. The U-shaped hood contacts the cover plate and the side wall of the U-shaped base to form a sealed space, and the U-shaped hood communicates with the gap. The induced draft fan is connected to the U-shaped hood through a first exhaust gas pipe, and the induced draft fan is connected to the housing through a second exhaust gas pipe. When transporting high-temperature molten copper, the U-shaped refractory bricks are covered with a cover plate, allowing the sulfur dioxide fumes carried by the molten copper to escape only through the gaps. At this time, the smoke extraction component is activated, the induced draft fan starts, and the sulfur dioxide fumes enter the U-shaped hood and finally enter the housing through the first and second exhaust pipes. The sulfur dioxide fumes are stored inside the housing for subsequent processing, preventing the sulfur dioxide fumes from overflowing and effectively avoiding the direct discharge of sulfur dioxide fumes into the air and polluting the environment.

[0007] Furthermore, the U-shaped hood includes a first side plate, a second side plate, a third side plate, a fourth side plate, and a top plate. The first, second, third, and fourth side plates are fixedly connected, and the top plate is fixedly connected to the same side of the first, second, third, and fourth side plates. A cylinder is provided on the top of the frame, and the telescopic rod of the cylinder is fixedly connected to the outer side of the top plate and can drive it to slide left and right. The first side plate contacts the side wall of the cover plate, the third side plate contacts the side wall of the U-shaped base, and the second and fourth side plates both contact the side walls of the cover plate and the side walls of the U-shaped base. The induced draft fan is connected to the third side plate through a first exhaust gas pipe. The top plate, first side plate, second side plate, third side plate, and fourth side plate cover the gap, so that sulfur dioxide flue gas can only enter the U-shaped hood through the gap. Then, the induced draft fan is started, and sulfur dioxide flue gas enters the housing from inside the U-shaped hood, through the first exhaust gas pipe, and through the second exhaust gas pipe, preventing sulfur dioxide flue gas from overflowing.

[0008] Furthermore, the interior of the housing is equipped with an activated carbon filter plate, which divides the interior into an exhaust gas area and a clean gas area. The induced draft fan is connected to the exhaust gas area of ​​the housing via a second exhaust gas pipe. An exhaust pipe is installed on the housing and is connected to the clean gas area. A valve is installed on the exhaust pipe. Sulfur dioxide flue gas enters the exhaust gas area of ​​the housing and is filtered by the activated carbon filter plate to become clean gas. The clean gas then enters the clean gas area of ​​the housing. When the valve is opened, the clean gas is discharged without polluting the air.

[0009] Furthermore, the top of the cover plate is provided with a handle and a transparent window, the transparent window being located above the first brick. The handle facilitates the operator's rotation of the cover plate. The transparent window allows the operator to observe the liquid level of the high-temperature copper liquid in the U-shaped refractory brick.

[0010] Furthermore, the chute body also includes a U-shaped packing layer, which is disposed between the U-shaped base and the U-shaped refractory brick.

[0011] Furthermore, the bottom of the U-shaped filler layer is sloped and the thickness of the left end of the U-shaped filler layer is greater than the thickness of the right end of the U-shaped filler layer; the first brick and a plurality of second bricks are placed sequentially inside the U-shaped filler layer.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] U-shaped refractory bricks have fewer joints. The first and second bricks are formed integrally, and each U-shaped refractory brick consists of a first brick and multiple second bricks. During use, adjacent first and second bricks, as well as between adjacent second bricks, fit tightly together. Compared to existing refractory bricks that are stacked brick by brick, this significantly reduces the number of joints. U-shaped refractory bricks have fewer joints, better overall integrity, and better thermal shock resistance. Therefore, when transporting high-temperature molten copper, U-shaped refractory bricks can effectively reduce the risk of leakage and prevent the refractory material from being washed away by the molten copper over long-term use, thus avoiding weak points. Furthermore, the filler layer and the U-shaped refractory bricks work together to further enhance thermal shock resistance. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a copper liquid chute device according to this utility model;

[0015] Figure 2 This is a utility model Figure 1 Enlarged structural diagram of A in the middle;

[0016] Figure 3 This is a structural schematic diagram of the U-shaped refractory brick of this utility model;

[0017] Figure 4 This is a schematic diagram of the structure of the first brick of this utility model;

[0018] Figure 5 This is a schematic diagram of the structure of the U-shaped cover of this utility model;

[0019] The numbers in the attached diagram are:

[0020] 1. U-shaped base; 2. Filler layer; 3. U-shaped refractory brick; 31. First brick body; 311. First inclined surface; 312. Second inclined surface; 313. Third inclined surface; 314. Fourth inclined surface; 32. Second brick body; 321. Fifth inclined surface; 322. Sixth inclined surface; 4. Cover plate; 41. Handle; 5. Smoke extraction assembly; 51. Frame; 52. U-shaped cover; 521. First side plate; 522. Second side plate; 523. Third side plate; 524. Fourth side plate; 525. Top plate; 53. Exhaust fan; 54. Box body; 541. Activated carbon filter plate; 55. Cylinder. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] like Figures 1-5 As shown, a copper liquid chute device includes a chute body, which comprises a U-shaped base 1 and U-shaped refractory bricks 3. The U-shaped refractory bricks 3 are disposed inside the U-shaped base 1, with a packing layer 2 between them. The U-shaped refractory bricks 3 have a drainage channel. The U-shaped base 1 is made of steel. Preferably, the packing is fixed to the bottom of the U-shaped base 1 by casting, and then the U-shaped refractory bricks 3 are placed on the packing. Then, packing is cast again between the two sides of the U-shaped refractory bricks 3 and the two sides of the U-shaped base 1, finally forming the packing layer 2, which supports the U-shaped refractory bricks 3. The U-shaped refractory brick 3 includes a first brick body 31 and multiple second brick bodies 32. The first brick body 31 and multiple second brick bodies 32 are placed sequentially inside the U-shaped base 1, with the filler layer 2 located between them and the U-shaped base 1. Adjacent first brick bodies 31 and second brick bodies 32, as well as two adjacent second brick bodies 32, are in contact, with adjacent first brick bodies 31 and second brick bodies 32 and two adjacent second brick bodies 32 being tightly fitted together. In use, the two ends of the chute body are fixedly connected to the blowing furnace and the copper ladle. The U-shaped refractory brick 3 on the chute body transports high-temperature molten copper from the blowing furnace to the copper ladle. In this embodiment, three second brick bodies 32 are used to meet the length requirements for transporting high-temperature molten copper.

[0023] The chute body of this embodiment has fewer brick joints, thus possessing high thermal shock resistance. Specifically, the U-shaped refractory brick 3 has fewer brick joints; the first brick body 31 and the second brick body 32 are integrally formed, and the U-shaped refractory brick 3 is composed of the first brick body 31 and multiple second brick bodies 32. During use, adjacent first brick bodies 31 and second brick bodies 32 are tightly fitted together, as are adjacent second brick bodies 32. Compared to the existing method of stacking refractory bricks one by one, this significantly reduces the number of brick joints. The U-shaped refractory brick 3 has fewer brick joints, better integrity, and better thermal shock resistance. Therefore, when conveying high-temperature copper liquid, the U-shaped refractory brick 3 can effectively reduce the risk of high-temperature copper liquid leakage and prevent the refractory material of the U-shaped refractory brick 3 from being washed away by high-temperature copper liquid after long-term use, thus avoiding weak points. Furthermore, after long-term use, the first brick body 31 and a certain second brick body 32 can be removed and replaced. The replacement operation is simple and convenient, greatly reducing the workload of the workers.

[0024] In this embodiment of the copper liquid chute device, the first brick body 31 and the second brick body 32 are integrally formed, and the U-shaped refractory brick 3 is composed of the first brick body 31 and multiple second brick bodies 32. When in use, the adjacent first brick bodies 31 and second brick bodies 32 are tightly fitted together, as are two adjacent second brick bodies 32. Compared with the existing method of stacking refractory bricks one by one, the number of brick joints is significantly reduced. The U-shaped refractory brick 3 has fewer brick joints, better integrity and thermal shock resistance. When transporting high-temperature copper liquid, the U-shaped refractory brick 3 effectively reduces the risk of copper liquid leakage and also avoids the refractory material of the U-shaped refractory brick 3 being washed away by the high-temperature copper liquid after long-term use, thus avoiding weak points.

[0025] In one possible implementation, the width of the left end of the first brick 31 is greater than the width of the right end of the first brick 31, and the width of the second brick 32 is the same as the width of the right end of the first brick 31. Specifically, the left end of the first brick 31 is fixedly connected to the blowing furnace, and the rightmost (i.e., the third) second brick 32 is fixedly connected to the copper ladle. The side wall of the left end of the first brick 31 includes a first inclined surface 311 and a second inclined surface 312, and the inclination of the first inclined surface 311 is less than the inclination of the second inclined surface 312. The side wall of the right end of the first brick 31 includes a third inclined surface 313 and a fourth inclined surface 314, and the inclination of the third inclined surface 313 is less than the inclination of the second inclined surface 312. The side wall of the second brick 32 includes a fifth inclined surface 321 and a sixth inclined surface 322, and the inclination of the fifth inclined surface 321 is less than the inclination of the sixth inclined surface 322. High-temperature molten copper sometimes carries slag from the smelting furnace. This slag may remain inside the chute, affecting its normal operation. After the U-shaped refractory brick 3 finishes conveying high-temperature molten copper, workers can clean the slag inside the U-shaped refractory brick 3, thus extending its service life. The inclination of the first inclined surface 311 is less than that of the second inclined surface 312, and the inclination of the third inclined surface 313 is less than that of the second inclined surface 312, making it easier for workers to clean the slag out of the first brick 31. Similarly, workers can easily clean the slag out of the second brick 32.

[0026] Furthermore, molten copper typically contains sulfur dioxide fumes, which, when released directly into the air, pollute the environment. To address the problem of sulfur dioxide fumes wasting and polluting the environment, the molten copper chute device in this embodiment further includes a cover plate 4 and a fumigation assembly 5, wherein the cover plate 4 is made of steel. The height of one side of the U-shaped base 1 is greater than the height of one side of the U-shaped refractory brick 3, and the height of the other side of the U-shaped base 1 is equal to the height of the other side of the U-shaped refractory brick 3. One end of the cover plate 4 is hinged and rotatably mounted on one side of the top of the U-shaped base 1. Specifically, a hinge bearing is provided on one side of the top of the U-shaped base 1, and a hinge rod is provided at one end of the cover plate 4. The end of the hinge rod is located within the hinge bearing and can rotate. The cover plate 4 is located above the drain trough, and the other end of the cover plate 4 is connected to the top of the U-shaped refractory brick 3 and the U-shaped base. A gap is formed between the top and the other side; the fumigation assembly 5 includes a frame 51, a U-shaped hood 52 movably mounted on the frame 51, an induced draft fan 53 mounted on the frame 51, and a housing 54. The frame 51 is located on the side of the chute body. The U-shaped hood 52 contacts the side wall of the cover plate 4 and the U-shaped base 1, forming a sealed space, and the U-shaped hood 52 communicates with the gap. The induced draft fan 53 is connected to the U-shaped hood 52 through a first exhaust gas pipe, and the induced draft fan 53 is connected to the housing 54 through a second exhaust gas pipe. There is also a gap between the cover plate 4 and both ends of the chute body, but because both ends of the chute body are fixedly connected to the smelting furnace and the copper ladle, no sulfur dioxide flue gas will be discharged from this gap. The lengths of the first and second exhaust gas pipes are set according to requirements.

[0027] Before conveying high-temperature molten copper, the U-shaped hood 52 of the U-shaped refractory brick 3 moves and contacts the side wall of the cover plate 4 and the U-shaped base 1. At this time, the U-shaped hood 52 communicates with the gap, that is, the U-shaped hood 52 covers the gap. When conveying high-temperature molten copper, the cover plate 4 is closed, and the sulfur dioxide flue gas carried by the high-temperature molten copper can only be discharged from the gap. At this time, the smoke extraction component 5 is activated, the induced draft fan 53 is started, and the sulfur dioxide flue gas enters the interior of the U-shaped hood 52 and finally enters the interior of the box 54 through the first exhaust gas pipe and the second exhaust gas pipe. The sulfur dioxide flue gas is stored inside the box 54 for subsequent processing, preventing the sulfur dioxide flue gas from overflowing and effectively avoiding the direct discharge of sulfur dioxide flue gas into the air and polluting the environment. In this embodiment, when the cover plate 4 cooperates with the U-shaped refractory brick 3 to convey high-temperature molten copper, the smoke extraction component 5 facilitates the absorption of sulfur dioxide flue gas, and the sulfur dioxide flue gas is stored inside the box 54, effectively preventing the sulfur dioxide flue gas from being directly discharged into the air and polluting the environment. After the U-shaped refractory brick 3 finishes conveying high-temperature copper liquid, the staff can open the cover plate 4 to clean the slag inside the chute body.

[0028] In one possible implementation, the U-shaped cover 52 includes a first side plate 521, a second side plate 522, a third side plate 523, a fourth side plate 524, and a top plate 525. The first side plate 521, the second side plate 522, the third side plate 523, and the fourth side plate 524 are fixedly connected. The top plate 525 is fixedly connected to the same side of the first side plate 521, the second side plate 522, the third side plate 523, and the fourth side plate 524. A cylinder 55 is provided on the top of the frame 51. The telescopic rod of the cylinder 55 is fixedly connected to the outer side of the top plate 525 and can drive it to slide left and right. The first side plate 521 is in contact with the side wall of the cover plate 4. The third side plate 523 is in contact with the side wall of the U-shaped base 1. The second side plate 522 and the fourth side plate 524 are both in contact with the side wall of the cover plate 4 and the side wall of the U-shaped base 1. The induced draft fan 53 is connected to the third side plate 523 through a first exhaust gas pipe. Cylinder 55 starts, causing the top plate 525, i.e., the U-shaped cover 52, to slide left and right. After the top plate 525 slides to the left, generally, the top plate 525, the first side plate 521, the second side plate 522, the third side plate 523, and the fourth side plate 524 cover the gap, and then the first and second exhaust gas pipes are installed. Sulfur dioxide flue gas can only enter the U-shaped cover 52 through the gap. Then, the induced draft fan 53 starts, and the sulfur dioxide flue gas enters the housing 54 from inside the U-shaped cover 52, through the first exhaust gas pipe, and through the second exhaust gas pipe, preventing the sulfur dioxide flue gas from overflowing.

[0029] Furthermore, a sealing gasket is provided on the side of the first side plate 521, the second side plate 522, the third side plate 523 and the fourth side plate 524 away from the top plate 525, and the sealing gasket can further prevent sulfur dioxide flue gas from overflowing.

[0030] In one possible implementation, the interior of the housing 54 is equipped with an activated carbon filter plate 541, which divides the interior of the housing 54 into an exhaust gas area and a clean gas area. The induced draft fan 53 is connected to the exhaust gas area of ​​the housing 54 through a second exhaust gas pipe. An exhaust pipe is installed on the housing 54 and is connected to the clean gas area of ​​the housing 54. A valve is installed on the exhaust pipe. Sulfur dioxide flue gas enters the exhaust gas area of ​​the housing 54 and becomes clean gas after being filtered by the activated carbon filter plate 541. The clean gas then enters the clean gas area of ​​the housing 54. When the valve is opened, the clean gas is discharged through the valve without polluting the air.

[0031] In one possible implementation, the top of the cover plate 4 is provided with a handle 41 and a transparent window, the transparent window being located above the first brick 31. The handle 41 facilitates the rotation of the cover plate 4 by the operator. The transparent window facilitates the operator's observation of the liquid level of the high-temperature copper liquid in the U-shaped refractory brick 3.

[0032] In one possible implementation, the chute body further includes a U-shaped packing layer 2, which is disposed between the U-shaped base 1 and the U-shaped refractory brick 3. The packing layer 2 and the U-shaped refractory brick 3 work together to further improve thermal shock resistance.

[0033] In one possible implementation, the bottom of the U-shaped packing layer 2 is sloped, and the thickness of the left end of the U-shaped packing layer 2 is greater than the thickness of the right end of the U-shaped packing layer 2; the first brick 31 and a plurality of second bricks 32 are placed sequentially inside the U-shaped packing layer 2. The sloped bottom of the packing layer 2 allows for better flow of the high-temperature copper liquid when the U-shaped refractory bricks 3 are used, thus improving the conveying efficiency.

[0034] The embodiments described above are merely preferred embodiments of this utility model and are only used to explain this utility model. They are not intended to limit the scope of implementation of this utility model. For those skilled in the art, other implementation methods can be easily made by substitution or modification based on the technical content disclosed in this specification. Therefore, all changes and improvements made to the principles and process conditions of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A copper liquid sluice box device, comprising a sluice box body, characterized in that, The chute body includes a U-shaped base (1) and a U-shaped refractory brick (3). The U-shaped refractory brick (3) is disposed inside the U-shaped base (1) and has a drainage groove. The U-shaped refractory brick (3) includes a first brick body (31) and a plurality of second brick bodies (32). The first brick body (31) and the plurality of second brick bodies (32) are placed in sequence inside the U-shaped base (1). Adjacent first brick bodies (31) and second brick bodies (32) as well as two adjacent second brick bodies (32) are in contact with each other.

2. The copper liquid chute device according to claim 1, characterized in that, The width of the left end of the first brick (31) is greater than the width of the right end of the first brick (31), and the width of the second brick (32) is the same as the width of the right end of the first brick (31); the side wall of the left end of the first brick (31) includes a first inclined surface (311) and a second inclined surface (312), and the inclination of the first inclined surface (311) is less than the inclination of the second inclined surface (312); the side wall of the right end of the first brick (31) includes a third inclined surface (313) and a fourth inclined surface (314), and the inclination of the third inclined surface (313) is less than the inclination of the second inclined surface (312); the side wall of the second brick (32) includes a fifth inclined surface (321) and a sixth inclined surface (322), and the inclination of the fifth inclined surface (321) is less than the inclination of the sixth inclined surface (322).

3. The copper liquid chute device according to claim 1, characterized in that, The copper liquid chute device also includes a cover plate (4) and a fumigation assembly (5). One end of the cover plate (4) is hinged and rotated on one side of the top of the U-shaped base (1). The cover plate (4) is located above the drain trough. The other end of the cover plate (4) forms a gap between the top of the U-shaped refractory brick (3) and the other side of the top of the U-shaped base (1). The fumigation assembly (5) includes a frame (51), a U-shaped cover (52) movably mounted on the frame (51), an induced draft fan (53) mounted on the frame (51), and a housing (54). The frame (51) is located on the side of the chute body. The U-shaped cover (52) contacts the cover plate (4) and the side wall of the U-shaped base (1) and forms a sealed space. The U-shaped cover (52) communicates with the gap. The induced draft fan (53) is connected to the U-shaped cover (52) through a first exhaust gas pipe. The induced draft fan (53) is connected to the housing (54) through a second exhaust gas pipe.

4. The copper liquid chute device according to claim 3, characterized in that, The U-shaped cover (52) includes a first side plate (521), a second side plate (522), a third side plate (523), a fourth side plate (524), and a top plate (525). The first side plate (521), the second side plate (522), the third side plate (523), and the fourth side plate (524) are fixedly connected. The top plate (525) is fixedly connected to the same side of the first side plate (521), the second side plate (522), the third side plate (523), and the fourth side plate (524). The frame (51) A cylinder (55) is provided at the top. The telescopic rod of the cylinder (55) is fixedly connected to the outer side of the top plate (525) and can drive it to slide left and right. The first side plate (521) is in contact with the side wall of the cover plate (4). The third side plate (523) is in contact with the side wall of the U-shaped base (1). The second side plate (522) and the fourth side plate (524) are both in contact with the side wall of the cover plate (4) and the side wall of the U-shaped base (1). The induced draft fan (53) is connected to the third side plate (523) through the first exhaust gas pipe.

5. The copper liquid chute device according to claim 3, characterized in that, The box (54) is equipped with an activated carbon filter plate (541) inside, which divides the interior of the box (54) into an exhaust gas area and a clean gas area. The exhaust fan (53) is connected to the exhaust gas area of ​​the box (54) through a second exhaust gas pipe. The box (54) is equipped with an exhaust pipe, which is connected to the clean gas area of ​​the box (54). A valve is installed on the exhaust pipe.

6. The copper liquid chute device according to claim 3, characterized in that, The top of the cover plate (4) is provided with a handle (41) and a transparent window, which is located above the first brick (31).

7. The copper liquid chute device according to claim 1, characterized in that, The chute body also includes a U-shaped packing layer (2), which is disposed between the U-shaped base (1) and the U-shaped refractory brick (3).

8. The copper liquid chute device according to claim 7, characterized in that, The bottom of the U-shaped filler layer (2) is sloped and the thickness of the left end of the U-shaped filler layer (2) is greater than the thickness of the right end of the U-shaped filler layer (2); the first brick (31) and a plurality of second bricks (32) are placed inside the U-shaped filler layer (2) in sequence.

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