A pouring pipeline system for a rolling mill stand and a method for using the same

Abstract

The present invention relates to the technical field of pouring of rolling mill stands, and provides a pouring pipeline system for a rolling mill stand and a method for using the same. The method for using the same includes: curing a first pouring pipe section in a first hard sand layer; placing a model of the rolling mill stand on the first hard sand layer; placing a second pouring pipe section in the set space; curing the second pouring pipe section and the model of the rolling mill stand in a second hard sand layer on the first hard sand layer; taking out the model of the rolling mill stand from the taking-out part on the surface of the second hard sand layer; using a prefabricated sand core to cover the taking-out part; pouring molten steel into the inlet end of the first pouring pipe section. By greatly reducing the usage amount of the pouring pipelines and the usage amount of molding sand of the rolling mill stand, the purpose of reducing the casting cost of the rolling mill stand is achieved, and the problem of excessively high casting cost of the existing rolling mill stand is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of casting of rolling mill stands, and more particularly, to a casting pipeline system for a rolling mill stand and a method for using the same. Background Art

[0002] In the prior art, due to the large volume of rolling mill stands, it is often necessary to first perform casting to form them, and then perform subsequent processing on the cast rolling mill stands to make the rolling mill stands meet the corresponding usage requirements.

[0003] Rolling mill stands are often cast using cast steel parts. Molten steel is poured into a prepared sand cavity through a casting pipeline system to form the rolling mill stand. After the rolling mill stand in the sand cavity is completely cooled, a cast steel part of the rolling mill stand is obtained. Due to the large volume of the rolling mill stand itself, the corresponding casting pipeline system and the amount of sand used for preparing the sand cavity are extremely large, resulting in a very high manufacturing cost of the rolling mill stand. Summary of the Invention

[0004] The present invention aims to solve the problem of excessively high casting cost of existing rolling mill stands.

[0005] To solve the above problems, the present invention provides a casting pipeline system for a rolling mill stand. The rolling mill stand includes a plurality of support parts, and the plurality of support parts are connected to each other to form a set space inside the rolling mill stand. The casting pipeline system includes:

[0006] A first casting pipe section for being arranged at the bottom of the rolling mill stand. An inlet end of the first casting pipe section is for being arranged outside the rolling mill stand, and an outlet end of the first casting pipe section is for being arranged in the set space; and

[0007] A second casting pipe section for being arranged in the set space. The second casting pipe section includes an inlet end and a plurality of outlet ends. The inlet end of the second casting pipe section is for being communicated with its plurality of outlet ends respectively. The inlet end of the second casting pipe section is for being communicated with the outlet end of the first casting pipe section, and the plurality of outlet ends of the second casting pipe section are arranged towards the corresponding support parts.

[0008] Optionally, the first casting pipe section includes:

[0009] A horizontal pipe for being arranged below the support part;

[0010] A first connecting pipe, one end of which is for being communicated with the horizontal pipe, and the other end of the first connecting pipe is for being communicated with the inlet end of the second casting pipe section; and

[0011] An injection pipe, the bottom of which is for being communicated with the horizontal pipe, and the top of the injection pipe is the inlet end of the first casting pipe section.

[0012] Optionally, the second pouring pipe section includes:

[0013] a main pipe for communicating with the outlet end of the first pouring pipe section; and

[0014] a plurality of branch pipes, one end of each of which is used to communicate with the main pipe respectively, the other end of each branch pipe is arranged to face the corresponding support part, and each branch pipe is arranged near the bottom surface of the corresponding support part.

[0015] Optionally, there are two first pouring pipe sections, the inlet ends of the two second pouring pipe sections are respectively arranged at both ends of the second pouring pipe section, the two first pouring pipe sections are arranged at both ends of the second pouring pipe section, and the outlet end of each first pouring pipe section is communicated with the inlet end of the corresponding second pouring pipe section.

[0016] The two first pouring pipe sections and the second pouring pipe section form a pouring pipeline, there are a plurality of the pouring pipelines, and the plurality of pouring pipelines are arranged in parallel;

[0017] The pouring pipeline system further includes a plurality of second connecting pipes, and the second connecting pipes are used to connect the plurality of second pouring pipe sections or the plurality of first pouring pipe sections.

[0018] In addition, the present invention also provides a method for using a pouring pipeline system, including:

[0019] Solidify the first pouring pipe section in the first hard sand layer, and expose the inlet end and the outlet end of the first pouring pipe section from the first hard sand layer;

[0020] Place the model of the rolling mill housing on the first hard sand layer, and place the outlet end of the first pouring pipe section in the set space of the model of the rolling mill housing;

[0021] Place the second pouring pipe section in the set space, connect its inlet end to the outlet end of the first pouring pipe section, and make the plurality of outlet ends of the second pouring pipe section contact the model of the rolling mill housing;

[0022] Solidify the second pouring pipe section and the model of the rolling mill housing in the second hard sand layer on the first hard sand layer, and expose the inlet end of the first pouring pipe section and the top surface of the model of the rolling mill housing from the second hard sand layer;

[0023] Take out the model of the rolling mill housing from the taking-out part on the surface of the second hard sand layer, where the taking-out part is the part where the top surface of the model of the rolling mill housing is exposed from the second hard sand layer;

[0024] Cover the taking-out part with a prefabricated sand core;

[0025] Pour molten steel into the inlet end of the first casting pipe section.

[0026] Optionally, the second hard sand layer that cures the model of the second casting pipe section and the rolling mill housing in the first hard sand layer includes:

[0027] Surround the model of the rolling mill housing with a plurality of chromite sand blocks and make the chromite sand blocks adhere to the model of the rolling mill housing;

[0028] Use quartz sand to landfill the first hard sand layer around the plurality of chromite sand blocks;

[0029] Cure the quartz sand and the plurality of chromite sand blocks into the second hard sand layer.

[0030] Optionally, curing the first casting pipe section in the first hard sand layer and exposing the inlet end and the outlet end of the first casting pipe section from the first hard sand layer includes:

[0031] Cure a third hard sand layer in the sand pit;

[0032] Place the chill and the first casting pipe section on the third hard sand layer;

[0033] Seal the outlet end of the first casting pipe section;

[0034] Bury the first casting pipe section and the chill in the molding sand on the third hard sand layer;

[0035] Cure the molding sand into the first hard sand layer and expose the top surface of the chill, the inlet end and the outlet end of the first casting pipe section from the first hard sand layer.

[0036] Optionally, the prefabricated sand core is provided with a plurality of risers, and the plurality of risers are evenly distributed on the top surface of the prefabricated sand core; there are a plurality of the first casting pipe sections, the outlet ends of the plurality of first casting pipe sections are respectively communicated with the second casting pipe section, the plurality of first casting pipe sections are arranged around the second casting pipe section, and the inlet end of each first casting pipe section extends out of the second hard sand layer;

[0037] The step of pouring molten steel into the inlet end of the first casting pipe section includes:

[0038] Pour molten steel into the inlet ends of the plurality of first casting pipe sections respectively;

[0039] Observe the rising situation of the molten steel in the plurality of risers;

[0040] Adjust the pouring amount of the molten steel at the inlet end of the corresponding first casting pipe section according to the rising situation of the molten steel in the plurality of risers.

[0041] Optionally, the first hard sand layer and / or the second hard sand layer is furan resin self-hardening sand.

[0042] Optionally, before placing the second pouring pipe section in the set space and connecting its inlet end to the outlet end of the first pouring pipe section so that the multiple outlet ends of the second pouring pipe section contact the model of the rolling mill housing, it further includes:

[0043] Determine the shape and layout of the second pouring pipe section according to the set space of the model of the rolling mill housing.

[0044] Compared with the prior art, the present invention has the following technical effects:

[0045] In the present invention, the first pouring pipe section bypasses from the bottom of the rolling mill housing, and then the first pouring pipe section is connected to the second pouring pipe section arranged inside the rolling mill housing. The inlet end of the first pouring pipe section is arranged outside the rolling mill housing, so that only a small part of the first pouring pipe section occupies the external space of the rolling mill housing, while most of the first pouring pipe section is arranged at the bottom of the rolling mill housing. At the same time, the second pouring pipe section is arranged in the set space inside the rolling mill housing, so that the pipe material usage of the first pouring pipe section and the second pouring pipe section is fully reduced. At the same time, only a small part of the first pouring pipe section is arranged outside the rolling mill housing, which greatly reduces the floor area of the entire pouring system in the sand pit compared with the prior art method of arranging pouring pipelines outside the rolling mill housing, so that the corresponding amount of molding sand used is also correspondingly greatly reduced. In addition, the multiple outlet ends of the second pouring pipe section are arranged towards the corresponding supporting parts, so that the molten steel entering the second pouring pipe section through the first pouring pipe section can still be evenly poured into the rolling mill housing, ensuring the smooth rise of the molten steel during the pouring process. Thus, the quality of the poured rolling mill housing is ensured. Thus, on the premise of ensuring the pouring quality of the rolling mill housing, by greatly reducing the usage amount of the pouring pipelines and the molding sand of the rolling mill housing, the purpose of reducing the casting cost of the rolling mill housing is achieved, and the problem of too high casting cost of the existing rolling mill housing is solved.

[0046] According to statistical calculations, for the O-shaped rolling mill housing, using the pouring pipeline system of the present invention, the sand-iron ratio (sand-iron ratio = weight of molding sand used for the casting / gross weight of the casting) during the casting process of the rolling mill housing is reduced from 2.7 - 2.8 to 2.0. Description of the Drawings

[0047] Figure 1 It is a schematic perspective view of a pouring pipeline system for a rolling mill housing in an embodiment of the present invention;

[0048] Figure 2 It is another schematic perspective view of a pouring pipeline system for a rolling mill housing in an embodiment of the present invention;

[0049] Figure 3 Schematic flowchart of the main steps of the method for using the pouring pipeline system in the embodiments of the present invention;

[0050] Figure 4 Schematic flowchart of all steps of the method for using the pouring pipeline system in the embodiments of the present invention;

[0051] Description of reference numerals: 100, first pouring pipe section; 110, horizontal pipe; 120, first connecting pipe; 130, injection pipe; 200, second pouring pipe section; 210, main pipe; 220, branch pipe; 300, second connecting pipe; 400, rolling mill stand; 410, supporting part; 420, setting space. Detailed implementation manners

[0052] To make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention will be given with reference to the accompanying drawings.

[0053] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here.

[0054] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0055] In the description of this specification, the descriptions referring to terms such as "embodiment", "one embodiment" and "one implementation manner" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or implementation manner are included in at least one embodiment or implementation manner of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or implementation manner. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or implementation manners in a suitable manner.

[0056] In the accompanying drawings of the specification, the Z-axis represents the vertical direction, that is, the up-and-down direction, and the positive direction of the Z-axis (that is, the direction pointed by the arrow of the Z-axis) represents up, and the negative direction of the Z-axis (that is, the direction opposite to the positive direction of the Z-axis) represents down; in the accompanying drawings, the Y-axis represents the front-and-back direction; in the accompanying drawings, the X-axis represents the left-and-right direction; at the same time, it should be noted that the meanings represented by the foregoing Z-axis, Y-axis and X-axis are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0057] See Figures 1 to 4 , to solve the above technical problems, this embodiment provides a pouring pipe system for a rolling mill stand 400. The rolling mill stand 400 includes a plurality of support parts 410, which are connected to each other through the plurality of support parts 410, so as to form a set space 420 inside the rolling mill stand 400. The pouring pipe system includes:

[0058] The first pouring pipe section 100 is used to be arranged at the bottom of the rolling mill stand 400. The inlet end of the first pouring pipe section 100 is used to be arranged outside the rolling mill stand 400, and the outlet end of the first pouring pipe section 100 is used to be arranged in the set space 420; and

[0059] The second pouring pipe section 200 is used to be arranged in the set space 420. The second pouring pipe section 200 includes an inlet end and a plurality of outlet ends. The inlet end of the second pouring pipe section 200 is used to communicate with its plurality of outlet ends respectively. The inlet end of the second pouring pipe section 200 is used to communicate with the outlet end of the first pouring pipe section 100. The plurality of outlet ends of the second pouring pipe section 200 are arranged towards the corresponding support parts 410.

[0060] It should be noted that the shapes formed by the connection of the plurality of support parts 410 here include: for example, four support parts 410 are connected in sequence to form an O shape. For another example, it can be a rolling mill stand 400 in which a plurality of support parts 410 are spliced into a "day" shape. For another example, it can be a rolling mill stand 400 in which a plurality of support parts 410 are spliced into a "mountain" shape. For another example, it can be a rolling mill stand 400 in which a plurality of support parts 410 are spliced into a "U" shape, so as to form corresponding different set spaces 420 inside the plurality of support parts 410. For example, when four support parts 410 are connected in sequence to form an O shape, only one closed set space 420 is arranged inside it; for another example, when a plurality of support parts 410 are spliced into a rolling mill stand 400 in a "day" shape, only two closed set spaces 420 are arranged inside it; for another example, when a plurality of support parts 410 are spliced into a rolling mill stand 400 in a "mountain" shape, the set space 420 is two open types; for another example, when a plurality of support parts 410 are spliced into a rolling mill stand 400 in a "U" shape, the set space 420 is one open type.

[0061] In addition, the first pouring pipe section 100 and the second pouring pipe section 200 here can be ceramic tile pipes;

[0062] It should be noted that the cooperation relationship between the pouring pipeline system in this embodiment and the rolling mill housing 400 is also applicable to the cooperation between the pouring pipeline system and the model of the rolling mill housing 400. Because the shape and size of the rolling mill housing 400 model are the same as those of the rolling mill housing 400.

[0063] Using the pouring pipeline system in this embodiment, connect the first pouring pipe section 100 and the second pouring pipe section 200 and bury them in the corresponding hard sand layer in the sand pit. Then, make the corresponding sand cavity through the rolling mill housing 400 model, and then pour molten steel into the sand cavity through the first pouring pipe section 100 and the second pouring pipe section 200. After waiting for cooling, obtain the corresponding rolling mill housing 400. The specific usage method of the pouring pipeline system of the present invention will be described in detail in the following text of this embodiment, and only a brief description is given here.

[0064] The inventor of the present invention found that currently, the pouring pipeline systems of rolling mill housings 400 all arrange the pouring pipelines outside the rolling mill housing 400, so that the horizontal main pouring pipe (commonly known as the cross runner) is arranged around the rolling mill housing 400 model, and the horizontal main pouring pipe often maintains a distance of 300 mm from the outer side wall of the rolling mill housing 400 to arrange the corresponding branch pipes 220 to be butted against the outer side wall of the rolling mill housing 400 model; and in order to ensure the reliability of pouring, the inner wall of the sand pit often maintains a distance of 300 mm from the horizontal main pouring pipe; then use molding sand to landfill and solidify the pouring pipeline system and the rolling mill housing 400 model in the sand pit. This makes the entire pouring system huge in volume and requires a large amount of molding sand and pouring pipelines. As a result, the manufacturing cost of the rolling mill housing 400 is extremely high.

[0065] To this end, in the present invention, the first pouring pipe section 100 bypasses from the bottom of the rolling mill stand 400, and then the first pouring pipe section 100 is connected to the second pouring pipe section 200 arranged inside the rolling mill stand 400. The inlet end of the first pouring pipe section 100 is arranged outside the rolling mill stand 400, so that only a small part of the first pouring pipe section 100 occupies the external space of the rolling mill stand 400, and most of the first pouring pipe section 100 is arranged at the bottom of the rolling mill stand 400. At the same time, the second pouring pipe section 200 is arranged in the set space 420 inside the rolling mill stand 400, thus fully reducing the pipe material usage of the first pouring pipe section 100 and the second pouring pipe section 200. At the same time, only a small part of the first pouring pipe section 100 is arranged outside the rolling mill stand 400, which greatly reduces the floor area of the entire pouring system in the sand pit compared with the way of arranging the pouring pipeline outside the rolling mill stand 400 in the prior art, so that the corresponding amount of molding sand used is also correspondingly greatly reduced. In addition, the multiple outlet ends of the second pouring pipe section 200 are arranged towards the corresponding supporting parts 410, so that the molten steel entering the second pouring pipe section 200 through the first pouring pipe section 100 can still be evenly poured into the rolling mill stand 400, ensuring the smooth rise of the molten steel during the pouring process. Thus, the quality of the poured rolling mill stand 400 is ensured. Thus, on the premise of ensuring the pouring quality of the rolling mill stand 400, by greatly reducing the usage amount of the pouring pipeline and the molding sand of the rolling mill stand 400, the purpose of reducing the casting cost of the rolling mill stand 400 is achieved, and the problem of too high casting cost of the existing rolling mill stand 400 is solved.

[0066] According to statistical calculations, for the O-shaped rolling mill stand 400, using the pouring pipeline system of the present invention, the sand-iron ratio (sand-iron ratio = weight of molding sand used for the casting / gross weight of the casting) during the casting process of the rolling mill stand 400 is reduced from 2.7 - 2.8 to 2.0.

[0067] See Figure 1 and Figure 2 , further, the first pouring pipe section 100 includes:

[0068] A horizontal pipe 110 for being arranged below the supporting part 410;

[0069] A first connecting pipe 120, one end of which is used to communicate with the horizontal pipe 110, and the other end of the first connecting pipe 120 is used to communicate with the inlet end of the second pouring pipe section 200; and

[0070] An injection pipe 130, the bottom of which is used to communicate with the horizontal pipe 110, and the top of the injection pipe 130 is the inlet end of the first pouring pipe section 100.

[0071] The injection pipe 130 here can be arranged vertically.

[0072] It is split into a horizontal pipe 110, a first connecting pipe 120, and an injection pipe 130, which is convenient for bypassing the support part 410. And being set like this is also convenient for assembling the first casting pipe section 100, reducing the amount of pipe material used for the first casting pipe section 100.

[0073] See Figure 1 and Figure 2 , further, the second casting pipe section 200 includes:

[0074] a main pipe 210 for communicating with the outlet end of the first casting pipe section 100; and

[0075] a plurality of branch pipes 220, one end of each of which is used to communicate with the main pipe 210 respectively, the other end of each branch pipe 220 is arranged to face the corresponding support part 410, and each of the said branch pipes 220 is arranged close to the bottom surface of the corresponding said support part 410.

[0076] See Figure 1 and Figure 2 , further, there are two first casting pipe sections 100, the two inlet ends of the second casting pipe section 200 are respectively arranged at both ends of the second casting pipe section 200, the two first casting pipe sections 100 are arranged at both ends of the second casting pipe section 200, and the outlet end of each first casting pipe section 100 communicates with the inlet end of the corresponding second casting pipe section 200.

[0077] The two first casting pipe sections 100 and the second casting pipe section 200 form a casting pipeline, and there are multiple casting pipelines arranged in parallel;

[0078] The casting pipeline system further includes a plurality of second connecting pipes 300, and the second connecting pipes 300 are used to connect the plurality of second casting pipe sections 200 or the plurality of first casting pipe sections 100.

[0079] See Figure 1 and Figure 2 , specifically, the rolling mill housing 400 can be formed by four support parts 410 spliced in sequence into an O shape, that is, a rectangular structure. Therefore, the set space 420 is a closed cuboid space; the four support parts 410 can include: two frame column parts, a frame lower crossbeam part, and a frame upper crossbeam part. The two long strip-shaped frame column parts are arranged parallel to each other, the frame lower crossbeam part and the frame upper crossbeam part are respectively located at both ends in the length direction of the frame column parts, and both ends of each frame column part are respectively connected to the frame lower crossbeam part and the frame upper crossbeam part.

[0080] Correspondingly, there can be two pouring pipelines, that is to say, they can be composed of two second pouring pipe sections 200 and four first pouring pipe sections 100. In addition, according to the set space 420 of the model of the rolling mill housing 400 described above, the shape and layout of the second pouring pipe section 200 are determined; specifically, for example, the main pipe 210 here can be a long straight pipe section and extend along the length direction of the set space 420, and multiple branch pipes 220 are all arranged perpendicular to the main pipe 210, and the multiple branch pipes 220 are arranged at intervals along the main pipe 210 in sequence. This also makes two adjacent horizontal pipes 110, two adjacent injection pipes 130, and two adjacent main pipes 210 arranged parallel to each other, and two adjacent horizontal pipes 110, two adjacent injection pipes 130 or two adjacent main pipes 210 can be connected through corresponding second connecting pipes 300 respectively.

[0081] This is also a specific example for the subsequent "determine the shape and layout of the second pouring pipe section 200 according to the set space 420 of the model of the rolling mill housing 400" in this embodiment. That is, a specific example for "determine the shape and layout of the second pouring pipe section 200 according to the set space 420 of the model of the rolling mill housing 400" in the subsequent "S70".

[0082] In this way, multiple second pouring pipe sections 200 or multiple first pouring pipe sections 100 are connected through the second connecting pipes 300. And the other end of each branch pipe 220 is arranged towards the corresponding support part 410. In this way, by increasing the number of branch pipes 220 and making the corresponding second pouring pipe sections 200 and first pouring pipe sections 100 communicate with each other through multiple second connecting pipes 300, especially making two adjacent main pipes 210 communicate with each other, the situation of molten steel choking during pouring is avoided, and the molten steel can rise smoothly.

[0083] In addition, considering that the volume and weight of the rolling mill housing 400 are relatively large, the net weight is generally more than 120 tons, and the weight of the molten steel is about 240 tons, at least two ladles are used for combined pouring. Each ladle is lifted by a crane, and the minimum distance between two cranes is 10.5 meters. Therefore, the two first pouring pipe sections 100 are arranged at both ends of the second pouring pipe section 200, so as to meet the spacing requirements for the operation of two cranes in the workshop, and realize that the two cranes can pour the rolling mill housing 400 simultaneously from the inlet ends of the two first pouring pipe sections 100 respectively.

[0084] Preferably, the inner diameter of the branch pipe 220 can be 110 mm to 130 mm.

[0085] In addition, by arranging each of the branch pipes 220 close to the bottom surface of the corresponding support portion 410, the molten steel at the branch pipes 220 and the bottom of the support portion 410 solidifies first, which has the effect of reinforcing the sand bed under the crossbeam of the rolling mill housing 400, preventing the crossbeam of the rolling mill housing 400 from sinking due to a large riser, and thus preventing the rolling mill housing 400 from deforming during casting.

[0086] See Figure 3 , in addition, the present invention also provides a method of using a pouring pipe system, using the aforementioned pouring pipe system, the method of use includes:

[0087] Curing the first pouring pipe section 100 in the first hard sand layer, and exposing the inlet end and the outlet end of the first pouring pipe section 100 from the first hard sand layer;

[0088] Placing the model of the rolling mill housing 400 on the first hard sand layer, and placing the outlet end of the first pouring pipe section 100 in the set space 420 of the model of the rolling mill housing 400;

[0089] Placing the second pouring pipe section 200 in the set space 420, connecting its inlet end to the outlet end of the first pouring pipe section 100, and making the multiple outlet ends of the second pouring pipe section 200 contact the model of the rolling mill housing 400;

[0090] Curing the second pouring pipe section 200 and the model of the rolling mill housing 400 in the second hard sand layer on the first hard sand layer, and exposing the inlet end of the first pouring pipe section 100 and the top surface of the model of the rolling mill housing 400 from the second hard sand layer;

[0091] Taking out the model of the rolling mill housing 400 from the taking-out part on the surface of the second hard sand layer, where the taking-out part is the part where the top surface of the model of the rolling mill housing 400 is exposed from the second hard sand layer;

[0092] Covering the taking-out part with a prefabricated sand core;

[0093] Pouring molten steel into the inlet end of the first pouring pipe section 100.

[0094] In this way, by curing the first pouring pipe section 100 within the first hard sand layer, the fixation of the first pouring pipe section 100 is achieved. Then, the model of the rolling mill housing 400 is placed on the first hard sand layer, the second pouring pipe section 200 is placed in the set space 420, and the model of the second pouring pipe section 200 and the rolling mill housing 400 are cured within the second hard sand layer on the first hard sand layer, thus realizing the installation and fixation of the entire pouring pipeline system. Finally, the model of the rolling mill housing 400 is taken out from the extraction position on the surface of the second hard sand layer, and the extraction position is covered with a prefabricated sand core to complete the installation of the pouring pipeline system for the entire rolling mill housing 400. Molten steel is poured into the inlet end of the first pouring pipe section 100 to achieve the casting of the rolling mill housing 400.

[0095] See Figure 4 , further, curing the model of the second pouring pipe section 200 and the rolling mill housing 400 within the second hard sand layer on the first hard sand layer includes:

[0096] Surround the model of the rolling mill housing 400 with multiple chromite sand blocks and make the chromite sand blocks stick to the model of the rolling mill housing 400;

[0097] Use quartz sand to landfill the first hard sand layer around the multiple chromite sand blocks;

[0098] Make the quartz sand and the multiple chromite sand blocks cure into the second hard sand layer.

[0099] Stick the chromite sand blocks to the model of the rolling mill housing 400. The chromite sand blocks have a good casting effect on the surface of the rolling mill housing 400, especially they will not adhere to the surface of the rolling mill housing 400. In addition, during the pouring of molten steel, the chromite sand blocks themselves undergo solid-phase sintering, preventing the molten steel from penetrating into the second hard sand layer, thereby preventing mechanical sand adhesion; at the same time, using the characteristic of high heat conduction efficiency of chromite sand, the rolling mill housing 400 can solidify quickly.

[0100] Just surround the model of the rolling mill housing 400 with multiple chromite sand blocks, use quartz sand to landfill the first hard sand layer around the multiple chromite sand blocks, and finally make the quartz sand and the multiple chromite sand blocks cure into the second hard sand layer. In this way, the advantages of chromite sand blocks can be fully utilized to ensure the casting effect of the rolling mill housing 400. Quartz sand can be used to replace chromite sand at positions far from the rolling mill housing 400, thereby reducing the manufacturing cost of the second hard sand layer and avoiding the high cost caused by using all chromite sand for the second hard sand layer. At the same time, using multiple chromite sand blocks to surround the model of the rolling mill housing 400 ensures the casting effect of chromite sand on the rolling mill housing 400.

[0101] See Figure 4, Further, curing the first pouring pipe section 100 in the first hard sand layer and exposing the inlet end and the outlet end of the first pouring pipe section 100 from the first hard sand layer includes:

[0102] Curing a third hard sand layer in the sand pit;

[0103] Placing the chill and the first pouring pipe section 100 on the third hard sand layer;

[0104] Blocking the outlet end of the first pouring pipe section 100;

[0105] Burying the first pouring pipe section 100 and the chill in the molding sand on the third hard sand layer;

[0106] Curing the molding sand into the first hard sand layer and exposing the top surface of the chill, the inlet end and the outlet end of the first pouring pipe section 100 from the first hard sand layer.

[0107] Specifically, the outlet end of the first pouring pipe section 100 is sealed with tape to prevent sand from entering the outlet end of the first pouring pipe section 100 during sand discharging, which is not easy to clean.

[0108] Utilizing the third hard sand layer cured under the first hard sand layer to increase the thickness of the hard sand layer under the poured rolling mill housing 400, thereby ensuring the casting effect of the rolling mill housing 400 and preventing deformation.

[0109] In addition, using the already cured and formed third hard sand layer as a reference platform and placing the chill and the first pouring pipe section 100 on the third hard sand layer can ensure the accurate positioning of the chill and the first pouring pipe section 100, thereby ensuring the accurate butt-joint of the inlet end of the subsequent second pouring pipe section 200 and the outlet end of the first pouring pipe section 100.

[0110] Preferably, there are four chills, which are respectively arranged under the four corners of the rolling mill housing 400, and the first pouring pipe and the second pouring pipe are arranged between the four chills. The heat of the rolling mill housing 400 is conducted outward from the bottom by the chills.

[0111] See Figure 4 , Further, the prefabricated sand core is provided with a plurality of risers, and the plurality of risers are evenly distributed on the top surface of the prefabricated sand core; there are a plurality of first pouring pipe sections 100, the outlet ends of the plurality of first pouring pipe sections 100 are respectively communicated with the second pouring pipe section 200, the plurality of first pouring pipe sections 100 are arranged around the second pouring pipe section 200, and the inlet end of each first pouring pipe section 100 extends out of the second hard sand layer;

[0112] Pouring molten steel into the inlet end of the first pouring pipe section 100 includes:

[0113] Pouring molten steel into the inlet ends of the plurality of first pouring pipe sections 100 respectively;

[0114] Observe the rising of molten steel in multiple risers;

[0115] According to the rising of molten steel in multiple risers, adjust the pouring amount of molten steel at the inlet end of the corresponding first pouring pipe section 100.

[0116] During pouring, the commander observes the rising of molten steel in multiple risers from above the multiple risers. For example, check whether the rising speeds of the molten steel are the same, and then adjust the pouring amount of molten steel at the inlet end of the corresponding first pouring pipe section 100. Thereby, the liquid level of the molten steel rises smoothly. Thereby ensuring that the internal quality of the rolling mill housing 400 is almost defect-free.

[0117] See Figure 3 and Figure 4 , further, the first hard sand layer and / or the second hard sand layer is furan resin self-hardening sand.

[0118] Utilize the characteristics of good fluidity of furan resin self-hardening sand and no need for manual stamping and stirring, reduce the labor intensity of workers, and can make the surface quality of the casting better, make the edges and corners of the cast rolling mill housing 400 clear, and reduce the subsequent processing amount of the rolling mill housing 400.

[0119] See Figure 4 , further, place the second pouring pipe section 200 in the set space 420, and connect its inlet end to the outlet end of the first pouring pipe section 100. Before the multiple outlet ends of the second pouring pipe section 200 contact the model of the rolling mill housing 400, it further includes: determining the shape and layout of the second pouring pipe section 200 according to the set space 420 of the model of the rolling mill housing 400.

[0120] Thereby avoiding interference between the set space 420 of the model of the rolling mill housing 400 and the shape and layout of the second pouring pipe section 200.

[0121] See Figure 4 , therefore, the usage method of the foregoing pouring pipeline system in this embodiment includes:

[0122] S10. Cure to form a third hard sand layer in the sand pit;

[0123] S20. Place the chill and the first pouring pipe section 100 on the third hard sand layer;

[0124] S30. Plug the outlet end of the first pouring pipe section 100;

[0125] S40. Bury the first pouring pipe section 100 and the chill in the molding sand on the third hard sand layer;

[0126] S50. Cure the molding sand into the first hard sand layer, and expose the top surface of the chill, the inlet end and the outlet end of the first pouring pipe section 100 from the first hard sand layer;

[0127] S60. Place the model of the rolling mill housing 400 on the first hard sand layer, and position the outlet end of the first pouring pipe section 100 within the set space 420 of the model of the rolling mill housing 400;

[0128] S70. Determine the shape and arrangement of the second pouring pipe section 200 based on the set space 420 of the model of the rolling mill housing 400;

[0129] S80. Place the second pouring pipe section 200 within the set space 420, connect its inlet end to the outlet end of the first pouring pipe section 100, and make the multiple outlet ends of the second pouring pipe section 200 contact the model of the rolling mill housing 400;

[0130] S90. Surround the model of the rolling mill housing 400 with multiple chromite sand blocks and make the chromite sand blocks stick to the model of the rolling mill housing 400;

[0131] S100. Use quartz sand to fill and bury the first hard sand layer around the multiple chromite sand blocks;

[0132] S110. Solidify the quartz sand and the multiple chromite sand blocks into a second hard sand layer, and expose the inlet end of the first pouring pipe section 100 and the top surface of the model of the rolling mill housing 400 from the second hard sand layer;

[0133] S120. Solidify the second pouring pipe section 200 and the model of the rolling mill housing 400 within the second hard sand layer on the first hard sand layer, and expose the inlet end of the first pouring pipe section 100 and the top surface of the model of the rolling mill housing 400 from the second hard sand layer;

[0134] S130. Remove the model of the rolling mill housing 400 from the extraction area on the surface of the second hard sand layer, where the extraction area is the part where the top surface of the model of the rolling mill housing 400 is exposed from the second hard sand layer;

[0135] S140. Use a prefabricated sand core to cover the extraction area;

[0136] S150. Pour molten steel into the inlet ends of the multiple first pouring pipe sections 100 respectively;

[0137] S160. Observe the rising situation of the molten steel in the multiple risers;

[0138] S170. Adjust the pouring amount of the molten steel at the inlet end of the corresponding first pouring pipe section 100 according to the rising situation of the molten steel in the multiple risers.

[0139] Thus, the pouring is completed.

[0140] If the gross weight of a rolling mill housing 400 is calculated as 120 tons, the amount of green sand that can be saved for the rolling mill housing 400 is: 120 * (2.8 - 2.0) = 96 tons, the amount of resin saved (the resin addition in silica sand is 1%): 96 * 1% = 0.96 tons, and the amount of curing agent saved (the curing agent accounts for 35% of the resin): 0.96 * 35% = 0.336 tons.

[0141] Therefore, the cost of the saved materials for one rolling mill housing 400 is:

[0142] 0.96 * 23000 + 0.336 * 4500 = 23592 yuan. Additionally, by using the aforementioned pouring pipe system, the total length of the main pipe 210 is reduced by 20 meters, approximately 2 tons of molten steel is saved, and the cost saved is approximately 9000 yuan.

[0143] Although the present disclosure is disclosed as above, the scope of protection of the present disclosure is not limited thereto. Without departing from the spirit and scope of the present disclosure, those skilled in the art can make various changes and modifications, and these changes and modifications will all fall within the scope of protection of the present invention.

Claims

1. A pouring pipeline system for a rolling mill housing, characterized in that, The rolling mill housing (400) includes a plurality of support parts (410), which are interconnected through the plurality of support parts (410) to form a set space (420) inside the rolling mill housing (400). The pouring pipe system includes: A first pouring pipe section (100) for bypassing from the bottom of the rolling mill housing (400). The inlet end of the first pouring pipe section (100) is arranged outside the rolling mill housing (400), and the outlet end of the first pouring pipe section (100) is arranged in the set space (420); and A second pouring pipe section (200) for being arranged in the set space (420). The second pouring pipe section (200) includes an inlet end and a plurality of outlet ends. The inlet end of the second pouring pipe section (200) is communicated with its plurality of outlet ends respectively. The inlet end of the second pouring pipe section (200) is communicated with the outlet end of the first pouring pipe section (100). The plurality of outlet ends of the second pouring pipe section (200) are arranged towards the support part (410); There are two first pouring pipe sections (100). The inlet ends of the two second pouring pipe sections (200) are respectively arranged at both ends of the second pouring pipe section (200). The two first pouring pipe sections (100) are arranged at both ends of the second pouring pipe section (200). The outlet end of each first pouring pipe section (100) is communicated with the inlet end of the corresponding second pouring pipe section (200), The two first pouring pipe sections (100) and the second pouring pipe section (200) form a pouring pipeline. There are a plurality of pouring pipelines, and the plurality of pouring pipelines are arranged in parallel; The pouring pipe system further includes a plurality of second connecting pipes (300), and the second connecting pipes (300) are used to connect the plurality of second pouring pipe sections (200) or the plurality of first pouring pipe sections (100).

2. The pouring pipe system for a rolling mill housing according to claim 1, characterized in that, The first pouring pipe section (100) includes: A horizontal pipe (110) for being arranged below the support part (410); A first connecting pipe (120), one end of which is used to be communicated with the horizontal pipe (110), and the other end of the first connecting pipe (120) is used to be communicated with the inlet end of the second pouring pipe section (200); and An injection pipe (130), the bottom of which is used to be communicated with the horizontal pipe (110), and the top of the injection pipe (130) is the inlet end of the first pouring pipe section (100).

3. The pouring pipe system for a rolling mill stand according to claim 1, characterized in that, The second pouring pipe section (200) includes: A main pipe (210) for being communicated with the outlet end of the first pouring pipe section (100); and A plurality of branch pipes (220), one end of which is used to be communicated with the main pipe (210) respectively, and the other end of each branch pipe (220) is used to be arranged towards the corresponding support part (410), and each branch pipe (220) is arranged close to the bottom surface of the corresponding support part (410).

4. A method of using a pouring pipeline system, the pouring pipeline system being the pouring pipeline system according to any one of claims 1 to 3, characterized in that, The usage method includes: Solidifying the first pouring pipe section (100) in the first hard sand layer, and exposing the inlet end and the outlet end of the first pouring pipe section (100) out of the first hard sand layer; Place the model of the rolling mill housing (400) on the first hard sand layer, and position the outlet end of the first pouring pipe section (100) within the set space (420) of the model of the rolling mill housing (400); Place the second pouring pipe section (200) within the set space (420), connect its inlet end to the outlet end of the first pouring pipe section (100), and make the multiple outlet ends of the second pouring pipe section (200) contact the model of the rolling mill housing (400); Solidify the second pouring pipe section (200) and the model of the rolling mill housing (400) within the second hard sand layer on the first hard sand layer, and expose the inlet end of the first pouring pipe section (100) and the top surface of the model of the rolling mill housing (400) above the second hard sand layer; Remove the model of the rolling mill housing (400) from the removal location on the surface of the second hard sand layer, where the removal location is the part where the top surface of the model of the rolling mill housing (400) is exposed above the second hard sand layer; Cover the removal location with a prefabricated sand core; Pour molten steel into the inlet end of the first pouring pipe section (100).

5. The method of using the pouring pipeline system according to claim 4, characterized in that, The step of solidifying the second pouring pipe section (200) and the model of the rolling mill housing (400) within the second hard sand layer on the first hard sand layer includes: Surround the model of the rolling mill housing (400) with multiple chromite sand blocks, and make the chromite sand blocks stick to the model of the rolling mill housing (400); Use quartz sand to fill the first hard sand layer around the multiple chromite sand blocks; Solidify the quartz sand and the multiple chromite sand blocks into the second hard sand layer.

6. The method for using the casting pipeline system according to claim 4, characterized in that, The step of solidifying the first pouring pipe section (100) within the first hard sand layer and exposing the inlet end and the outlet end of the first pouring pipe section (100) above the first hard sand layer includes: Solidify a third hard sand layer in the sand pit; Place the chill and the first pouring pipe section (100) on the third hard sand layer; Seal the outlet end of the first pouring pipe section (100); Bury the first pouring pipe section (100) and the chill in the molding sand on the third hard sand layer; Solidify the molding sand into the first hard sand layer, and expose the top surface of the chill, the inlet end and the outlet end of the first pouring pipe section (100) above the first hard sand layer.

7. The method for using the pouring pipeline system according to claim 4, characterized in that The prefabricated sand core is provided with multiple risers, and the multiple risers are evenly distributed on the top surface of the prefabricated sand core; there are multiple first pouring pipe sections (100), the outlet ends of the multiple first pouring pipe sections (100) are respectively communicated with the second pouring pipe section (200), the multiple first pouring pipe sections (100) are arranged around the second pouring pipe section (200), and the inlet end of each first pouring pipe section (100) extends out of the second hard sand layer; The step of pouring molten steel into the inlet end of the first pouring pipe section (100) includes: Pour molten steel into the inlet ends of the multiple first pouring pipe sections (100) respectively; Observe the rising condition of the molten steel in the multiple risers; Adjust the pouring amount of molten steel at the inlet end of the corresponding first pouring pipe section (100) according to the rising situation of molten steel in multiple risers.

8. The method of using the casting pipeline system according to any one of claims 4 to 7, characterized in that, The first hard sand layer and / or the second hard sand layer is / are furan resin self-hardening sand.

9. The method of using the pouring pipeline system according to any one of claims 4 to 7, characterized in that Before placing the second pouring pipe section (200) in the set space (420) and connecting its inlet end to the outlet end of the first pouring pipe section (100) so that multiple outlet ends of the second pouring pipe section (200) contact the model of the rolling mill housing (400), it further includes: Determine the shape and arrangement of the second pouring pipe section (200) according to the set space (420) of the model of the rolling mill housing (400).

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