Casting mold for coal gas conical section

Abstract

The utility model relates to the technical field of hot blast stoves, and particularly discloses a gas conical section pouring mold which comprises a first inner ring mold, a first outer ring mold, a first filling block and a supporting mechanism. A pouring cavity used for pouring a mixing chamber is formed between the first inner ring mold and the first outer ring mold, the first filling block is located in the pouring cavity, connected with the first inner ring mold and the first outer ring mold and used for forming a first ventilation hole in the mixing chamber, and the supporting mechanism is used for supporting the first inner ring mold and the first outer ring mold. The construction process of the mixing chamber wall can be simpler and more convenient.

Description

Technical Field

[0001] The present application relates to the technical field of hot blast furnaces, and in particular to a gas cone segment casting mold. Background Art

[0002] The blast furnace hot blast furnace is a facility that provides hot air to the iron-making blast furnace. Its working principle is to generate high-temperature flue gas by burning coal gas through the burner of the hot blast furnace, heat the heat storage body in the hot blast furnace and store heat, and then the cold blast enters the hot blast furnace from the bottom of the hot blast furnace. During the rising process, it is gradually heated by the heat storage body and becomes high-temperature blast. The high-temperature blast enters the hot blast main pipe through the hot blast outlet and the hot blast branch pipe, and is sent to the blast furnace for the pig iron smelting process. According to the location of the burner of the hot blast furnace, the hot blast furnace can be divided into various structural forms such as internal combustion hot blast furnace, external combustion hot blast furnace and top combustion hot blast furnace. The top combustion hot blast furnace has been rapidly promoted at home and abroad due to its outstanding advantages.

[0003] From top to bottom, the top-burning hot blast furnace is mainly composed of three parts: the mixing chamber, the combustion chamber and the regenerator. The mixing chamber is a premixing chamber for air and gas, which is set at the upper part of the combustion chamber and independently supported on the furnace shell; the gas and the combustion-supporting air enter the mixing chamber and mix evenly, and then enter the dome combustion chamber through the burner for complete combustion. The high-temperature hot gas after combustion forms a uniform lateral temperature distribution and longitudinal temperature field in the regenerator, and the heat exchange efficiency of the regenerator is generally high. The hot air outlet is located at the lower part of the dome. The part above the regenerator in the furnace is connected to the hot air duct. The cold air inlet and the exhaust gas outlet are located at the bottom of the furnace body.

[0004] The inner wall of the mixing chamber of the top-fired hot blast furnace is a conical structure, generally built of bricks. Due to the periodic changes in temperature and pressure in the furnace and the relatively harsh working conditions, the walls of the mixing chamber are easily damaged and need to be dismantled and replaced after damage. The process of rebuilding the mixing chamber is rather cumbersome and the construction period is long, which can easily affect the production of the blast furnace. Utility Model Content

[0005] In order to make the construction process of the mixing chamber wall easier, the present application provides a gas cone segment casting mold.

[0006] The present application provides a gas cone segment casting mold adopting the following technical solution:

[0007] A gas cone segment casting mold comprises a first inner ring mold, a first outer ring mold, a first filling block and a supporting mechanism, wherein the first outer ring mold is sleeved outside the first inner ring mold, and a casting cavity for casting a mixing chamber is formed between the first inner ring mold and the first outer ring mold; the first filling block is located in the casting cavity and is connected to the first inner ring mold and the first outer ring mold to form a first ventilation hole on the mixing chamber; the supporting mechanism is used to support the first inner ring mold and the first outer ring mold.

[0008] By adopting the above technical solution, concrete is poured into the pouring cavity, and after the concrete solidifies, an annular furnace mixing chamber structure can be formed. Due to the provision of the first filling block, a first ventilation hole is provided on the mixing chamber, so that the molding process of the mixing chamber is simple, which can save construction time, thereby reducing the impact on the blast furnace production process and helping to reduce construction costs.

[0009] Optionally, the first inner ring mold includes a plurality of first arc plates, which are distributed in a circle, and the sides of adjacent first arc plates abut against each other; the first outer ring mold includes a plurality of second arc plates, which are distributed in a circle, and the sides of adjacent second arc plates abut against each other; both the first arc plates and the second arc plates have sockets, and the first filling blocks are inserted in the sockets of the first arc plates and the sockets of the second arc plates.

[0010] By adopting the above technical solution, the first inner ring mold is formed by splicing multiple first arc-shaped plates, and the first outer ring mold is formed by splicing multiple second arc-shaped plates. Therefore, the space occupied by the mold can be reduced during the transportation project, which is convenient for transportation; after the arc-shaped plates are transported to the site, they can be spliced.

[0011] Optionally, fiber cotton is filled in at least one of the following places: between the first filling block and the hole wall of the insertion hole of the first arc-shaped plate; between the first filling block and the hole wall of the insertion hole of the second arc-shaped plate.

[0012] By adopting the above technical solution, the provision of fiber cotton can reduce the possibility of material leakage at the connection between the first filling block and the insertion hole of the first arc plate and between the first filling block and the insertion hole of the second arc plate, which helps to ensure the molding quality of the mixing chamber.

[0013] Optionally, the insertion holes of the first arc-shaped plate and the insertion holes of the second arc-shaped plate alternate with each other in the circumferential direction.

[0014] By adopting the above technical solution, the multiple first ventilation holes on the mixing chamber are arranged in a rotary cut shape, which helps to accelerate the mixing of the gas.

[0015] Optionally, it further includes a plurality of partition plates, which are all located between the first inner ring mold and the first outer ring mold and are spaced apart along the circumferential direction of the first inner ring mold to divide the casting cavity into a plurality of sections.

[0016] By adopting the above technical solution, the partition plate is arranged to form the expansion joint, thereby reducing the influence of thermal expansion and contraction on the mixing chamber structure and helping to extend the service life.

[0017] Optionally, it also includes a second inner ring mold, a second outer ring mold and a second filling block, the second outer ring mold is arranged outside the second inner ring mold, the bottom end of the second inner ring mold is coaxially connected to the top end of the first inner ring mold, the bottom end of the second outer ring mold is coaxially connected to the top end of the first outer ring mold, the second filling block is located between the second inner ring mold and the second outer ring mold, and is connected to the second inner ring mold and the second outer ring mold, and is used to form a second ventilation hole on the mixing chamber.

[0018] By adopting the above technical solution, the mold includes an upper and lower layer, and the mixing chamber structure can be divided into two pourings, and the concrete is first poured into the lower mold during the molding process. After the lower structure is formed, the upper mold is installed on the top of the lower structure, and then concrete is poured into the upper mold. Therefore, pouring in batches helps to improve the pouring effect of concrete, thereby improving the molding quality.

[0019] Optionally, a first magnetic component is disposed at one end of the first filling block close to the first arc-shaped plate, and a second magnetic component is disposed on the first arc-shaped plate, and the second magnetic component can be attracted to the first magnetic component.

[0020] By adopting the above technical solution, after the first filling block is installed, the first magnetic part and the second magnetic part are attracted to each other, which helps to enhance the stability of the first filling block after installation, thereby reducing the possibility of the first filling block deviating from the installation position during the pouring of concrete, thereby ensuring the molding quality of the wall at the first ventilation hole.

[0021] Optionally, the supporting mechanism includes a first supporting assembly and a second supporting assembly, wherein the first supporting assembly is used to support the first inner ring mold and the second inner ring mold, and the second supporting assembly is used to support the first outer ring mold and the second outer ring mold.

[0022] By adopting the above technical solution, the supporting mechanism can support the inner ring mold and the outer ring mold, which helps to smoothly carry out the casting process.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. After the first inner ring mold, the first outer ring mold and the first filling block are installed, concrete is poured into the pouring cavity. After the concrete solidifies, the structure of the mixing chamber of the furnace body can be formed. Therefore, the molding process is simple and helps to shorten the construction time.

[0025] 2. The mold structure consists of two layers, the upper and lower layers, so the pouring can be done in two times during construction, which helps to improve the quality of concrete pouring. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0027] Figure 2 is a cross-sectional view of an embodiment of the present application;

[0028] Figure 3 It is a structural schematic diagram of an embodiment of the present application for demonstrating the installation position of the second filling block.

[0029] 1. The mold of the first inner ring is molded; 2. The mold of the first outer ring is molded; 3. The jack is inserted into the mold; 4. The first filling block is inserted into the mold; 5. The first supporting assembly is assembled; 51. The first mounting plate is assembled; 52. The first mounting block is assembled; 53. The first supporting frame is assembled; 531. The first supporting rod is assembled; 532. The first supporting ring is assembled; 5321. The fixing block is assembled; 54. The second supporting frame is assembled; 541. The second supporting rod is assembled; 542. The second supporting ring is assembled; 55. The third supporting frame is assembled; 551. The third supporting rod is assembled; 552. The third supporting ring is assembled; 6. The second supporting assembly is assembled; 61. The second mounting plate is assembled; 62. The second mounting block is assembled; 63. The fourth supporting frame is assembled; 64. The fifth supporting frame is assembled; 65. The sixth supporting frame is assembled; 7. The casting cavity is assembled; 8. The partition plate is assembled; 9. The mold of the second inner ring is assembled; 10. The mold of the second outer ring is assembled; 12. The second filling block is assembled; 13. The first magnetic member is assembled; 14. The second magnetic member is assembled; 15. The mixing chamber is assembled. DETAILED DESCRIPTION

[0030] The present application is further described in detail below in conjunction with the accompanying drawings.

[0031] The present application embodiment discloses a gas cone segment casting mold. Figure 1 and Figure 2 The gas cone casting mold includes a first inner ring mold 1, a first outer ring mold 2, a first filling block 4 and a supporting mechanism. The first inner ring mold 1 and the first outer ring mold 2 are both annular structures and are coaxially arranged with the axis arranged vertically; the top and bottom ends of the first inner ring mold 1 are both provided with openings, and the top opening diameter of the first inner ring mold 1 is smaller than the bottom opening diameter of the first inner ring mold 1; the top and bottom ends of the first outer ring mold 2 are both provided with openings, and the top opening diameter of the first outer ring mold 2 is smaller than the bottom opening diameter of the first outer ring mold 2. The first outer ring mold 2 is sleeved on the outside of the first inner ring mold 1 at intervals, and a casting cavity 7 is formed between the first outer ring mold 2 and the first inner ring mold 1 for pouring concrete. A mixing chamber 15 can be formed after the concrete solidifies. There are multiple first filling blocks 4, which are arranged in a circle. The first filling blocks 4 are installed in the casting cavity 7, and one end of the first filling block 4 passes through the outside of the first outer ring mold 2, and the other end of the first filling block 4 passes through the inside of the first inner ring mold 1. Therefore, after the concrete in the casting cavity 7 is formed, a first ventilation hole can be formed at the first filling block 4 to facilitate air to enter the mixing chamber 15.

[0032] The first inner ring mold 1 includes twenty first curved plates 11, which are arranged in a circular array, and the side walls of two adjacent first curved plates 11 abut against each other, and the twenty first curved plates 11 together form the first inner ring mold 1. The first outer ring mold 2 includes twenty second curved plates 21, which are arranged in a circular array, and the side walls of two adjacent second curved plates 21 abut against each other, and the twenty second curved plates 21 together form the first outer ring mold 2. The first curved plates 11 and the second curved plates 21 are both provided with insertion holes 3 for inserting the first filling blocks 4, and each first curved plate 11 corresponds to a second curved plate 21; there are twenty first filling blocks 4, one end of the first filling block 4 is inserted from the insertion hole 3 on the second curved plate 21, and the other end of the first filling block 4 is inserted from the insertion hole 3 on the first curved plate 11.

[0033] Fiber cotton is filled between the first filling block 4 and the hole wall of the socket 3 on the first arc plate 11, and between the first filling block 4 and the hole wall of the socket 3 on the second arc plate 21, thereby reducing the possibility of leakage at both ends of the first filling block 4 and helping to ensure construction quality.

[0034] In order to improve the stability of the first filling block 4 after installation, refer to Figure 3 , the first magnetic member 13 is bonded to one end of the first filling block 4 that passes through the first curved plate 11, a support block 111 is fixedly connected to the wall surface of the first curved plate 11 on the side away from the second curved plate 21, and a second magnetic member 14 is bonded to the support block 111; the first magnetic member 13 and the second magnetic member 14 are both magnets, and the magnetic poles of the first magnetic member 13 and the second magnetic member 14 close to each other are in opposite directions. Therefore, when the first filling block 4 is installed, the first magnetic member 13 and the second magnetic member 14 are attracted to each other, so that the first filling block 4 is not easy to deviate during the pouring of concrete.

[0035] Among them, the sockets 3 on the first arc plate 11 and the sockets 3 on the second arc plate 21 are staggered in the circumferential direction. From the projection on the horizontal plane, the extension line of the length direction of the first filling block 4 installed between the first arc plate 11 and the second arc plate 21 intersects with the inner circle at the top of the first inner ring mold 1, and the length of the secant of the part where the extension line of the length direction of each first filling block 4 intersects with the inner circle at the top of the first inner ring mold 1 is equal. In addition, from the projection on the vertical plane, the end of the first filling block 4 close to the first outer ring mold 2 is higher than the end of the first filling block 4 close to the first inner ring mold 1. Therefore, the first ventilation hole after molding is arranged along the rotary cutting direction, which is convenient for accelerating the mixing of gas in the mixing chamber 15.

[0036] In order to reduce the influence of thermal expansion and contraction on the structure of the mixing chamber 15, refer to Figure 2A partition plate 8 is installed between the first inner ring mold 1 and the first outer ring mold 2. Four partition plates 8 are provided and arranged in a circumferential manner. The partition plates 8 can divide the casting cavity 7 into a plurality of chambers. Therefore, after the concrete solidifies, an expansion joint is formed on the mixing chamber 15 at the partition plate 8, so that the mixing chamber 15 structure can be expanded after being heated, thereby extending the service life of the mixing chamber 15.

[0037] Further, refer to Figure 1 and Figure 2 , a second inner ring mold 9 is provided at the top of the first inner ring mold 1, and a second outer ring mold 10 is provided at the top of the first outer ring mold 2. The second outer ring mold 10 is sleeved on the outside of the second inner ring mold 9, and the second outer ring mold 10 and the second inner ring mold 9 are both coaxially arranged with the first inner ring mold 1. The bottom end of the second outer ring mold 10 abuts against the top end of the first outer ring mold 2, and the bottom end of the second inner ring mold 9 abuts against the top end of the first inner ring mold 1. The second outer ring mold 10 and the second inner ring mold 9 are both composed of fourteen arc plates. Since two layers of molds are provided, batch pouring can be carried out, which helps to improve the pouring quality of concrete.

[0038] A second filling block 12 is arranged between the second outer ring mold 10 and the second inner ring mold 9. Fourteen second filling blocks 12 are arranged, and each second filling block 12 is inserted between the second outer ring mold 10 and the corresponding second inner ring mold 9. After pouring concrete between the second outer ring mold 10 and the second inner ring mold 9, a second ventilation hole can be formed at the second filling block 12. Therefore, the first ventilation hole on the bottom layer of the mixing chamber 15 is for air to enter, and the second ventilation hole on the top layer of the mixing chamber 15 is for gas to enter. Both the first ventilation hole and the second ventilation hole are arranged along the rotary cutting direction, which helps to accelerate the mixing of the gas in the mixing chamber 15, so that the gas mixing is more sufficient.

[0039] A partition plate 8 is also arranged between the second outer ring mold 10 and the second inner ring mold 9. Four partition plates 8 are arranged, and the partition plates 8 between the second outer ring mold 10 and the second inner ring mold 9 are staggered with the partition plates 8 between the first outer ring mold 2 and the first inner ring mold 1, thereby helping to ensure the connection strength between the upper structure and the lower structure of the mixing chamber 15.

[0040] The support mechanism includes a first support assembly 5 and a second support assembly 6. The first support assembly 5 includes a first mounting plate 51, a first mounting block 52, a first support frame 53, a second support frame 54 and a third support frame 55. The first mounting plate 51 is a circular plate, and the first mounting plate 51 is located at the bottom end of the inner side of the first inner ring mold 1, and the first mounting plate 51 is fixedly connected to the inner wall of the furnace body. The first mounting block 52 is fixedly connected to the top surface of the first mounting plate 51, and a plurality of first mounting blocks 52 are provided, and the number of the first mounting blocks 52 is the same as the number of the first arc-shaped plates 11, and each first mounting block 52 corresponds to a first arc-shaped plate 11, and the first mounting block 52 and the bottom end of the corresponding first arc-shaped plate 11 are fixedly connected by bolts, thereby fixing the bottom end of the first arc-shaped plate 11.

[0041] The first support frame 53 includes a first support rod 531 and a first support ring 532. The first support rod 531 is fixedly connected to the top surface of the first mounting plate 51 by bolts. Two first support rods 531 are provided. The first support rods 531 are vertically arranged and respectively located at both ends of the first mounting plate 51. The first support ring 532 is a circular ring. The first support ring 532 is fixedly connected to the top of the first support rod 531 by bolts. The first support ring 532 is located on a side close to the top of the first curved plate 11. A plurality of fixing blocks 5321 are provided on the first support ring 532. The number of the fixing blocks 5321 is the same as the number of the first curved plates 11, and each fixing block 5321 corresponds to a first curved plate 11. Bolts are provided between the fixing blocks 5321 and the corresponding first curved plates 11. Nuts are threadedly connected to the bolts, thereby fixing the top of the first curved plate 11.

[0042] The structure of the second support frame 54 is substantially the same as that of the first support frame 53, and the second support frame 54 comprises a second support rod 541 and a second support ring 542. The length of the second support rod 541 is greater than that of the first support rod 531, and the second support rod 541 is fixedly connected to the top surface of the first mounting plate 51; the second support ring 542 is fixedly connected to the top end of the second support rod 541, and the second support ring 542 is located on the inner side of the second inner ring mold 9; the second support ring 542 and the second inner ring mold 9 are fixedly connected by bolts.

[0043] The structure of the third support frame 55 is roughly the same as that of the first support frame 53. The third support frame 55 includes a third support rod 551 and a third support ring 552. The third support rod 551 is fixedly connected to the top surface of the first mounting plate 51, and the length of the third support rod 551 is greater than the length of the second support rod 541; the third support ring 552 is fixedly connected to the top of the third support rod 551, and the third support ring 552 is located on the side close to the top of the second inner ring mold 9. The third support ring 552 and the top of the second inner ring mold 9 are fixedly connected by bolts. Therefore, under the action of the second support frame 54 and the third support frame 55, the second inner ring mold 9 can be fixed.

[0044] The structure of the second support assembly 6 is substantially the same as that of the first support assembly 5, and the second support assembly 6 includes a second mounting plate 61, a second mounting block 62, a fourth support frame 63, a fifth support frame 64 and a sixth support frame 65. The second mounting plate 61 is an annular plate, and the second mounting plate 61 is fixedly connected to the inner wall of the furnace body, and the second mounting plate 61 is located on the side close to the top of the second inner ring mold 9. The second mounting block 62, the fourth support frame 63, the fifth support frame 64 and the sixth support frame 65 are all fixedly connected to the bottom wall of the second mounting plate 61. The second mounting block 62 is used to fix the top of the second outer ring mold 10, the fourth support frame 63 is used to support the bottom end of the second outer ring mold 10, the fifth support frame 64 is used to support the top of the first outer ring mold 2, and the sixth support frame 65 is used to support the bottom end of the first outer ring mold 2.

[0045] The implementation principle of a coal gas cone casting mold in the embodiment of the present application is as follows: first install the first mounting plate 51 and the second mounting plate 61 in the furnace body, and the first mounting plate 51 is located below the second mounting plate 61; then install the first support frame 53 on the top surface of the first mounting plate 51, and sequentially set up the first arc-shaped plates 11, and multiple first arc-shaped plates 11 abut against each other to form the first inner ring mold 1. Then install the fifth support frame 64 and the sixth support frame 65 on the bottom surface of the second mounting plate 61, and then sequentially set up the second arc-shaped plates 21, and multiple second arc-shaped plates 21 abut against each other to form the first outer ring mold 2. Then install the first filling block 4 between the socket 3 on the first arc-shaped plate 11 and the socket 3 on the second arc-shaped plate 21, and make the first magnetic part 13 on the first filling block 4 and the second magnetic part 14 on the first arc-shaped plate 11 attract each other to fix the first filling block 4. Then, the partition plate 8 is installed, and then concrete is injected between the first inner ring mold 1 and the first outer ring mold 2. After the concrete solidifies, the first filling block 4 is removed to form the lower half of the mixing chamber 15.

[0046] Then, the second support frame 54 and the third support frame 55 are installed, and the second inner ring mold 9 is set up; the fourth support frame 63 is installed, and the second outer ring mold 10 is set up. Then, the second filling block 12 is installed between the second inner ring mold 9 and the second outer ring mold 10, and then the partition plate 8 is installed, and concrete is poured. After the concrete solidifies, the second filling block 12 is taken out to form the upper part of the mixing chamber 15.

[0047] After the mixing chamber 15 is formed, the outer ring mold and the inner ring mold are removed in turn. Therefore, the forming process of the mixing chamber 15 only requires setting up the mold and pouring concrete. The construction process is simpler and helps to shorten the construction period.

[0048] The above are optional embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A gas cone casting mold, characterized in that: The invention comprises a first inner ring mold (1), a first outer ring mold (2), a first filling block (4) and a supporting mechanism, wherein the first outer ring mold (2) is sleeved outside the first inner ring mold (1), a casting cavity (7) for casting a mixing chamber (15) is formed between the first inner ring mold (1) and the first outer ring mold (2), the first filling block (4) is located in the casting cavity (7) and is connected to the first inner ring mold (1) and the first outer ring mold (2) to form a first ventilation hole on the mixing chamber (15), and the supporting mechanism is used to support the first inner ring mold (1) and the first outer ring mold (2).

2. A gas cone segment casting mold according to claim 1, characterized in that: The first inner ring mold (1) comprises a plurality of first arc-shaped plates (11), the plurality of first arc-shaped plates (11) are distributed in a circumferential manner, and the side edges of adjacent first arc-shaped plates (11) abut against each other; the first outer ring mold (2) comprises a plurality of second arc-shaped plates (21), the plurality of second arc-shaped plates (21) are distributed in a circumferential manner, and the side edges of adjacent second arc-shaped plates (21) abut against each other; both the first arc-shaped plates (11) and the second arc-shaped plates (21) have insertion holes (3), and the first filling blocks (4) are inserted into the insertion holes (3) of the first arc-shaped plates (11) and the insertion holes (3) of the second arc-shaped plates (21).

3. A gas cone segment casting mold according to claim 2, characterized in that: Filled with fiber wool in at least one of the following places: Between the first filling block (4) and the hole wall of the insertion hole (3) of the first arc-shaped plate (11); Between the first filling block (4) and the hole wall of the insertion hole (3) of the second arc-shaped plate (21).

4. A gas cone segment casting mold according to claim 2, characterized in that: The insertion holes (3) of the first arc-shaped plate (11) and the insertion holes (3) of the second arc-shaped plate (21) are alternated with each other in the circumferential direction.

5. A gas cone segment casting mold according to claim 1, characterized in that: It also comprises a plurality of partition plates (8), wherein the plurality of partition plates (8) are all located between the first inner ring mould (1) and the first outer ring mould (2), and are spaced apart along the circumferential direction of the first inner ring mould (1), so as to divide the casting cavity (7) into a plurality of sections.

6. A gas cone segment casting mold according to any one of claims 1 to 5, characterized in that: The invention also comprises a second inner ring mould (9), a second outer ring mould (10) and a second filling block (12); the second outer ring mould (10) is sleeved outside the second inner ring mould (9); the bottom end of the second inner ring mould (9) is coaxially connected to the top end of the first inner ring mould (1); the bottom end of the second outer ring mould (10) is coaxially connected to the top end of the first outer ring mould (2); the second filling block (12) is located between the second inner ring mould (9) and the second outer ring mould (10), and is connected to the second inner ring mould (9) and the second outer ring mould (10), and is used to form a second ventilation hole on the mixing chamber (15).

7. A gas cone segment casting mold according to claim 4, characterized in that: A first magnetic component (13) is arranged at one end of the first filling block (4) close to the first arc-shaped plate (11), and a second magnetic component (14) is arranged on the first arc-shaped plate (11), wherein the second magnetic component (14) is capable of being attracted to the first magnetic component (13).

8. A gas cone segment casting mold according to claim 6, characterized in that: The support mechanism comprises a first support assembly (5) and a second support assembly (6), wherein the first support assembly (5) is used to support a first inner ring mold (1) and a second inner ring mold (9), and the second support assembly (6) is used to support a first outer ring mold (2) and a second outer ring mold (10).

Images