Particle steel hot-pressed block capable of being quickly melted

Abstract

The invention discloses a particle steel hot-pressing block capable of being quickly melted, and relates to the technical field of metal scrap resource utilization. The upper end size of the block body is smaller than the lower end size of the block body; a central filling hole and at least one filling auxiliary hole are formed in the top of the block body, and the bottoms of the central filling hole and the filling auxiliary holes are sealed; the hole bottom of the central filling hole and the hole bottoms of the auxiliary filling holes are both in a necking shape; the sizes of the upper ends of the central filling hole and the auxiliary filling holes are larger than the sizes of the lower ends of the central filling hole and the auxiliary filling holes; and the secondary filling holes are distributed around the axis of the central filling hole. And therefore, the requirement of fast-paced production of the steelmaking process is met.

Description

Technical Field

[0001] The invention relates to the technical field of resource utilization of metal scraps, in particular to a fast-melting particle steel hot-pressed block. Background Art

[0002] Particle steel hot pressed briquette is made by heating metal debris such as steel scraps, steel slag magnetic separation powder and steel slag particle steel, iron oxide scale, metallized pellets (DRI pellets) undersize (particle size <8mm) produced by rotary hearth furnace to about 850℃, making them in a semi-molten state, and then pressing them into briquette with a high-pressure briquetting machine. Particle steel hot pressed briquette has the remarkable characteristics of high strength, MFe (metallic iron) content higher than 85%, low impurity and moisture content, etc., and is widely used in steelmaking furnaces to replace scrap steel, or added to the molten iron tank for pre-melting and then poured into the steelmaking furnace together with the molten iron, with a significant effect of saving iron and increasing steel.

[0003] However, the existing particle steel hot pressed blocks are large in size and are solid bodies with a unit weight of about 65 kg. After being added to a steelmaking furnace or a molten iron tank, their melting speed is too slow and is not conducive to fast-paced production in the steelmaking process. Summary of the invention

[0004] The purpose of the present invention is to provide a fast-melting particle steel hot-pressed block to solve the problems existing in the above-mentioned prior art, which can be melted quickly to meet the demand of fast-paced production in the steelmaking process.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a fast-melting particle steel hot-pressed block, comprising a block; the upper end size of the block is smaller than the lower end size of the block; the top of the block is provided with a central pouring hole and at least one pouring auxiliary hole, the central pouring hole and each of the pouring auxiliary holes are both sealed at the bottom; the bottom of the central pouring hole and the bottom of the pouring auxiliary holes are both in a shrinking shape; and the upper end size of the central pouring hole and each of the pouring auxiliary holes is larger than their respective lower end sizes; each of the pouring auxiliary holes is distributed around the axis of the central pouring hole.

[0007] Preferably, the block is truncated cone-shaped.

[0008] Preferably, the cross section of the central injection hole is circular or polygonal.

[0009] Preferably, each of the injection auxiliary holes is connected to the central injection hole; the cross-section of the central injection hole is circular, and the inner diameter of the upper end of the central injection hole is larger than the inner diameter of the lower end of the central injection hole; the bottom of the central injection hole is an inverted cone; the cross-section of the injection auxiliary hole is rectangular, and the end surface area of ​​the upper end of the injection auxiliary hole is larger than the end surface area of ​​the lower end of the injection auxiliary hole; the longitudinal section of the bottom of the injection auxiliary hole is triangular.

[0010] Preferably, each of the auxiliary injection holes has the same shape as the central injection hole, and each of the auxiliary injection holes and the central injection hole are not connected to each other; the cross-section of the central injection hole is circular, and the inner diameter of the upper end of the central injection hole is larger than the inner diameter of the lower end of the central injection hole; the bottom of the central injection hole is an inverted cone.

[0011] Preferably, the number of the auxiliary injection hole is one, and the auxiliary injection hole is an annular groove, and the auxiliary injection hole is not connected to the central injection hole.

[0012] Preferably, the distance between the tip of the inverted cone at the bottom of the central pouring hole and the lower end of the block is smaller than the distance between the lower end of the bottom of the auxiliary pouring hole and the lower end of the block; the distance between the tip of the inverted cone at the bottom of the central pouring hole and the lower end of the block is 30mm to 90mm; the distance between the lower end of the bottom of the auxiliary pouring hole and the lower end of the block is 60mm to 120mm.

[0013] Preferably, the upper end diameter of the block is 150mm~420mm; the lower end diameter of the block is 180mm~450mm; the height of the block is 180mm~360mm; the upper end diameter of the central pouring hole is 35mm~95mm, and the lower end diameter of the central pouring hole is 30mm~90mm; the upper end length of the auxiliary pouring hole is 60mm~100mm, and the width is 30mm~60mm; and the lower end length of the auxiliary pouring hole is 55mm~95mm, and the width is 25mm~55mm.

[0014] Preferably, the tip of the inverted cone at the bottom of the central pouring hole is 30 mm to 100 mm away from the lower end of the block.

[0015] Preferably, the upper diameter of the block is 150mm-400mm; the lower diameter of the block is 180mm-450mm; the height of the block is 180mm-350mm; the upper diameter of the center injection hole is 35mm-100mm; the lower diameter of the center injection hole is 30mm-95mm.

[0016] Compared with the prior art, the present invention has achieved the following technical effects:

[0017] The fast-melting particle steel hot-pressed block provided by the present invention has a central injection hole and an auxiliary injection hole arranged on the block, so that after the block with such a structure is put into a steelmaking furnace or a molten iron tank, molten steel or molten iron can quickly enter the central injection hole and the auxiliary injection hole; and by arranging the block to be small at the top and large at the bottom, and coordinating the central injection hole and the auxiliary injection hole with a structural arrangement of large at the top and small at the bottom, the heat exchange area between high-temperature molten steel or molten iron and low-temperature particle steel hot-pressed block is greatly increased; the internal and external high-temperature molten steel or molten iron accelerates the melting speed of the whole, thereby meeting the fast-paced production requirements of the steelmaking process; and the central injection hole and the auxiliary injection hole adopt a structural arrangement of large at the top and small at the bottom, which also facilitates the pressing, forming and demoulding operations.

[0018] Furthermore, the truncated cone structure facilitates the production of the block, and the truncated cone block has more contact area with high-temperature molten steel or molten iron, thereby increasing the melting speed; the truncated cone shape also facilitates the use of mechanical devices for grabbing and placing.

[0019] Furthermore, the central injection hole adopts a circular or polygonal cross-sectional shape, which is convenient for processing and forming.

[0020] Furthermore, when each auxiliary pouring hole is connected to the central pouring hole, when the number of auxiliary pouring holes is 4, a plum blossom-shaped groove structure is formed; this connecting structure allows high-temperature molten steel or molten iron to diffuse inside the block from multiple directions, forming a complex convection path, thereby quickly transferring heat to various parts of the block and accelerating the melting of the particle steel.

[0021] Furthermore, the structure of each auxiliary pouring hole is the same as that of the central pouring hole, which is simple and convenient to manufacture, and the non-connected setting of the central pouring hole and each auxiliary pouring hole can effectively guide the high-temperature molten steel or molten iron to transfer heat at different positions of the block, thereby accelerating its melting speed.

[0022] Furthermore, the auxiliary injection hole is an annular groove structure, so as to cooperate with the central injection hole to achieve the effect of uniform and rapid melting inside and outside.

[0023] Furthermore, the cone tip at the bottom of the central injection hole is closer to the lower end of the block, so that after the high-temperature molten steel or molten iron enters the central injection hole, it can be better melted through in the center through the bottom of the central injection hole, while the bottom of each auxiliary injection hole is farther away from the lower end of the block. At this time, the high-temperature molten steel or molten iron can be intercepted and kept in the block, which has a better preheating effect on this position. As the bottom center area melts, the high-temperature molten steel or molten iron will gradually diffuse upward and to the surroundings, reducing the phenomenon of local melting unevenness and improving the melting effect and melting efficiency.

[0024] Furthermore, by adopting the above-mentioned constraints on the relevant dimensions, the block can achieve a better and faster melting effect in high-temperature molten steel or molten iron.

[0025] Furthermore, the distance between the cone tip at the bottom of the center injection hole and the lower end of the block is controlled to be 30mm to 100mm. This setting can form a uniform center bottom melting through for each center injection hole, and then diffuse the melting to the surrounding area with it as the center, thereby accelerating its melting efficiency.

[0026] Furthermore, based on the shape of the central injection hole, the block size can be made smaller, thereby achieving a better melting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A top view of the connecting structure between the central pouring hole and each pouring auxiliary hole in the fast-melting particle steel hot-pressed block provided by the present invention;

[0029] Figure 2 for Figure 1 The cross-sectional structure diagram at AA in the middle;

[0030] Figure 3 for Figure 1 The cross-sectional structure diagram at EE in the middle;

[0031] Figure 4 A top view of a structure in which a central pouring hole and each pouring auxiliary hole are not connected in a quick-melting particle steel hot-pressed block provided by the present invention, and the pouring auxiliary holes have a plurality of structure;

[0032] Figure 5 for Figure 4 Cross-sectional structure diagram at FF in the middle;

[0033] Figure 6 for Figure 4 The cross-sectional structure diagram at KK in the middle;

[0034] Figure 7 A top view of a structure in which a central pouring hole and each pouring auxiliary hole are not connected in a quick-melting particle steel hot-pressed block provided by the present invention, and the pouring auxiliary hole has one;

[0035] Figure 8 for Figure 7 Cross-sectional structure diagram at TT.

[0036] In the figure:

[0037] 10-block;

[0038] 20-Center injection hole;

[0039] 30-Pour into the secondary hole. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] The purpose of the present invention is to provide a fast-melting particle steel hot-pressed block to solve the problems existing in the prior art and to melt quickly to meet the demand for fast-paced production in the steelmaking process.

[0042] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] Embodiment 1

[0044] The present invention provides a fast-melting particle steel hot-pressed block, such as Figures 1 to 8 As shown, it includes a block 10; the upper end size of the block 10 is smaller than the lower end size of the block 10; a central injection hole 20 and at least one injection auxiliary hole 30 are provided on the top of the block 10, and the central injection hole 20 and each injection auxiliary hole 30 are sealed at the bottom; the bottom of the central injection hole 20 and the bottom of the injection auxiliary hole 30 are both in a constricted shape; and the upper end size of the central injection hole 20 and each injection auxiliary hole 30 is larger than their respective lower end size; each injection auxiliary hole 30 is distributed around the axis of the central injection hole 20.

[0045] By setting a central pouring hole 20 and a pouring auxiliary hole 30 on the block 10, after the block 10 of this structure is put into a steelmaking furnace or a molten iron tank, molten steel or molten iron can quickly enter the central pouring hole 20 and the pouring auxiliary hole 30; and by setting the block 10 to be small at the top and large at the bottom, and coordinating the central pouring hole 20 and the pouring auxiliary hole 30 with a structural setting of large at the top and small at the bottom, the heat exchange area between the high-temperature molten steel or molten iron and the low-temperature particle steel hot-pressed block is greatly increased; the high-temperature molten steel or molten iron inside and outside accelerates the melting speed of the whole, thereby meeting the fast-paced production requirements of the steelmaking process; and the central pouring hole 20 and the pouring auxiliary hole 30 adopt a structural setting of large at the top and small at the bottom, which also facilitates the pressing and demolding operations.

[0046] Among them, the structural setting of the block 10 is described as follows:

[0047] Specifically, the block 10 can be any shape in which the upper end size is smaller than the lower end size, and is preferably a truncated cone shape as shown below.

[0048] In the optional scheme of this embodiment, it is more preferred that the block 10 is truncated cone-shaped. The truncated cone-shaped structure is convenient for the production of the block 10, and the truncated cone-shaped block 10 has more contact area that can contact with high-temperature molten steel or molten iron, thereby increasing the melting speed; the truncated cone-shaped shape is also convenient for mechanical devices to grasp and place.

[0049] Among them, three matching structures of the central injection hole 20 and the injection auxiliary hole 30 are described as follows:

[0050] In the optional scheme of this embodiment, it is more preferred that the cross section of the central injection hole 20 is circular or polygonal (polygonal such as square, preferably circular). The central injection hole 20 adopts a circular or polygonal cross section shape, which is convenient for processing and forming.

[0051] The first type: the central injection hole 20 is connected to each injection auxiliary hole 30 and has a structure with multiple injection auxiliary holes 30:

[0052] In the optional scheme of this embodiment, it is more preferred that Figure 1 to Figure 3 As shown, each auxiliary pouring hole 30 is connected to the central pouring hole 20; the cross section of the central pouring hole 20 is circular, and the inner diameter of the upper end of the central pouring hole 20 is larger than the inner diameter of the lower end of the central pouring hole 20; the bottom of the central pouring hole 20 is an inverted cone; the cross section of the auxiliary pouring hole 30 is rectangular, and the end surface area of ​​the upper end of the auxiliary pouring hole 30 is larger than the end surface area of ​​the lower end of the auxiliary pouring hole 30; the longitudinal section of the bottom of the auxiliary pouring hole 30 is triangular. When the number of auxiliary pouring holes 30 is 4, a plum blossom-shaped groove structure is formed; this connection structure allows high-temperature molten steel or molten iron to diffuse inside the block 10 from multiple directions, forming a complex convection path, thereby quickly transferring heat to various parts of the block 10 and accelerating the melting of the particle steel.

[0053] In the optional scheme of this embodiment, it is more preferred that the distance between the tip of the inverted cone at the bottom of the central pouring hole 20 and the lower end of the block 10 is smaller than the distance between the lower end of the bottom of the auxiliary pouring hole 30 and the lower end of the block 10; the distance between the tip of the inverted cone at the bottom of the central pouring hole 20 and the lower end of the block 10 is 30mm to 90mm; the distance between the lower end of the bottom of the auxiliary pouring hole 30 and the lower end of the block 10 is 60mm to 120mm. The cone tip at the bottom of the central injection hole 20 is closer to the lower end of the block 10, so that after the high-temperature molten steel or molten iron enters the central injection hole 20, it can be better melted through in the center through the bottom of the central injection hole 20, and the bottom of each auxiliary injection hole 30 is farther from the lower end of the block 10. At this time, the high-temperature molten steel or molten iron can be intercepted and kept in the block 10, which has a better preheating effect on this position. As the bottom center area melts, the high-temperature molten steel or molten iron will gradually diffuse upward and to the surroundings, reducing the phenomenon of local uneven melting and improving the melting effect and melting efficiency.

[0054] In the optional scheme of this embodiment, it is more preferred that the upper diameter of the block 10 is 150mm-420mm; the lower diameter of the block 10 is 180mm-450mm; the height of the block 10 is 180mm-360mm; the upper diameter of the central pouring hole 20 is 35mm-95mm, and the lower diameter of the central pouring hole 20 is 30mm-90mm; the upper length of the pouring auxiliary hole 30 is 60mm-100mm, and the width is 30mm-60mm; and the lower length of the pouring auxiliary hole 30 is 55mm-95mm, and the width is 25mm-55mm. The above-mentioned constraints on the relevant dimensions are adopted, so that the block 10 can achieve a better and faster melting effect in high-temperature molten steel or molten iron.

[0055] Specific size case 1 (the unit weight of the particle steel hot-pressed block is 42kg): the upper end diameter d of the block 10 of the particle steel hot-pressed block is 250mm, the lower end diameter D of the block 10 is 260mm, and the height H of the block 10 is 220mm; the upper end diameter d1 of the center pouring hole 20 is 65mm, and the lower end diameter d2 of the center pouring hole 20 is 35mm. The bottom seal of the bottom of the hole is an inverted cone, and the distance between the inverted cone tip of the bottom seal and the bottom surface of the right truncated cone of the block 10 is h1=35mm; the upper end length L=70mm and the width B=65mm of the pouring auxiliary hole 30; the lower end length l=55mm and the width b=50mm of the pouring auxiliary hole 30; the bottom seal is an inverted regular triangle in the first longitudinal section and a rectangle in the second longitudinal section, and the distance between its bottom and the bottom of the pressed block is h2=60mm.

[0056] Specific size case 2 (the unit weight of the particle steel hot-pressed block is 46kg): the upper end diameter d of the block 10 of the particle steel hot-pressed block is 260mm, the lower end diameter D of the block 10 is 280mm, and the height H of the block 10 is 230mm; the upper end diameter d1 of the center pouring hole 20 is 70mm, and the lower end diameter d2 of the center pouring hole 20 is 40mm. The bottom seal of the bottom of the hole is an inverted cone, and the distance between the inverted cone tip of the bottom seal and the bottom surface of the right truncated cone of the block 10 is h1=40mm; the upper end length L=80mm and the width B=65mm of the pouring auxiliary hole 30; the lower end length l=70mm and the width b=50mm of the pouring auxiliary hole 30; the bottom seal is an inverted regular triangle in the first longitudinal section and a rectangle in the second longitudinal section, and the distance between its bottom and the bottom of the pressed block is h2=65mm.

[0057] The second type: the central injection hole 20 is not connected to each injection auxiliary hole 30 and has a structure with multiple injection auxiliary holes 30:

[0058] In the optional scheme of this embodiment, it is more preferred that Figures 4 to 6 As shown, each auxiliary pouring hole 30 has the same shape as the central pouring hole 20, and each auxiliary pouring hole 30 and the central pouring hole 20 are not connected to each other; the cross section of the central pouring hole 20 is circular, and the inner diameter of the upper end of the central pouring hole 20 is larger than the inner diameter of the lower end of the central pouring hole 20; the bottom of the central pouring hole 20 is an inverted cone. The same structure as that of each auxiliary pouring hole 30 and the central pouring hole 20 is adopted, which is simple and convenient to manufacture, and the non-connected setting of the central pouring hole 20 and each auxiliary pouring hole 30 can effectively guide the high-temperature molten steel or molten iron to transfer heat at different positions of the block 10, thereby accelerating its melting speed.

[0059] In the optional scheme of this embodiment, it is more preferred that the tip of the inverted cone at the bottom of the central injection hole 20 is 30mm to 100mm away from the lower end of the block 10, and the tip of the cone at the bottom of each injection auxiliary hole 30 is also 30mm to 100mm away from the lower end of the block 10. This setting can form a uniform bottom first melt through for each injection hole, and then diffuse the melting around it as the center, accelerating its melting efficiency.

[0060] In the optional scheme of this embodiment, it is more preferred that the upper diameter of the block 10 is 150mm-400mm; the lower diameter of the block 10 is 180mm-450mm; the height of the block 10 is 180mm-350mm; the upper diameter of the central injection hole 20 is 35mm-100mm; the lower diameter of the central injection hole 20 is 30mm-95mm. Based on the shape of the central injection hole 20, the size of the block 10 can be made smaller, so as to achieve a better melting effect.

[0061] Specific size case 1 (the unit weight of the particle steel hot-pressed block is 55kg): the upper end diameter d of the block 10 of the particle steel hot-pressed block is 250mm, the lower end diameter D of the block 10 is 260mm, and the height H of the block 10 is 220mm; the number of auxiliary pouring holes 30 is 6, which are evenly distributed around the central pouring hole 20 at an angle of 60°, specifically at 1 / 2 of the upper end diameter d of the block 10, the upper end diameter d1 of the central pouring hole 20 is 50mm, and the lower end diameter d2 is 40mm, and the tip of the inverted cone at the bottom of the central pouring hole 20 is h=60mm away from the lower end of the block 10.

[0062] Specific size case 2 (the unit weight of the particle steel hot-pressed block is 66kg): the upper end diameter d of the block 10 of the particle steel hot-pressed block is 280mm, the lower end diameter D of the block 10 is 300mm, and the height H of the block 10 is 230mm; the number of auxiliary pouring holes 30 is 4, which are evenly distributed around the central pouring hole 20 at an angle of 90°, specifically at 1 / 2 of the upper end diameter d of the block 10, the upper end diameter d1 of the central pouring hole 20 is 60mm, and the lower end diameter d2 is 50mm, and the tip of the inverted cone at the bottom of the central pouring hole 20 is h=50mm away from the lower end of the block 10.

[0063] The third type: the central injection hole 20 is not connected to each injection auxiliary hole 30 and has a structure with one injection auxiliary hole 30:

[0064] In the optional scheme of this embodiment, it is more preferred that Figure 7 and Figure 8 As shown, there is one auxiliary pouring hole 30, and the auxiliary pouring hole 30 is an annular groove, and the auxiliary pouring hole 30 is not connected to the central pouring hole 20. The auxiliary pouring hole 30 is an annular groove structure, so as to cooperate with the central pouring hole 20 to achieve uniform and rapid melting inside and outside.

[0065] Specific size case 1 (the unit weight of the particle steel hot pressed block is 50kg): the upper diameter of the block 10 of the particle steel hot pressed block is d=260mm, the lower diameter of the block 10 is D=280mm, and the height of the block 10 is H=210mm; the upper diameter of the center injection hole 20 is d1=80mm, the lower diameter is d2=60mm, and the distance between the tip of the inverted cone surface at the bottom of the center injection hole 20 and the lower end of the block 10 is h=45mm. The distance between the center line of the injection auxiliary hole 30 and the center line of the block 10 is t=85mm, the upper width of the injection auxiliary hole 30 is b1=60mm, and the lower width is b2=50mm; its bottom seal has a cross section in the diameter direction of an inverted regular triangle, and the distance between the tip of the inverted cone surface at the bottom of the injection auxiliary hole 30 and the lower end of the block 10 is also h=45mm.

[0066] Among them, about other related settings description:

[0067] Specifically, Figure 1 and Figure 4 As shown, the auxiliary pouring holes 30 are evenly distributed around the axis of the central pouring hole 20 , which can achieve a more uniform melting effect at each position of the block 10 .

[0068] Specifically, the data on the above-mentioned dimensions can be selected and set according to actual needs.

[0069] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A fast-melting particle steel hot-pressed block, characterized in that: Including blocks; The upper end size of the block is smaller than the lower end size of the block; A central injection hole and at least one injection auxiliary hole are provided on the top of the block, and the central injection hole and each of the injection auxiliary holes are sealed at the bottom; the bottom of the central injection hole and the bottom of the injection auxiliary holes are both in a constricted shape; and the upper end size of the central injection hole and each of the injection auxiliary holes is larger than their respective lower end sizes; and each of the injection auxiliary holes is distributed around the axis of the central injection hole.

2. The fast-melting particle steel hot-pressed block according to claim 1, characterized in that: The block is in the shape of a truncated cone.

3. The fast-melting particle steel hot-pressed block according to claim 2, characterized in that: The cross section of the central injection hole is circular or polygonal.

4. The fast-melting particle steel hot-pressed block according to claim 3 is characterized in that: Each of the auxiliary injection holes is connected to the central injection hole; The cross section of the central injection hole is circular, and the inner diameter of the upper end of the central injection hole is larger than the inner diameter of the lower end of the central injection hole; the bottom of the central injection hole is an inverted cone surface; The cross section of the auxiliary injection hole is rectangular, and the upper end surface area of ​​the auxiliary injection hole is larger than the lower end surface area of ​​the auxiliary injection hole; the longitudinal section of the bottom of the auxiliary injection hole is triangular.

5. The fast-melting particle steel hot-pressed block according to claim 3, characterized in that: Each of the auxiliary injection holes has the same shape as the central injection hole, and each of the auxiliary injection holes and the central injection hole are not connected to each other; The cross section of the central injection hole is circular, and the inner diameter of the upper end of the central injection hole is larger than the inner diameter of the lower end of the central injection hole; the bottom of the central injection hole is an inverted cone.

6. The fast-melting particle steel hot-pressed block according to claim 3, characterized in that: The number of the auxiliary injection holes is one, and the auxiliary injection hole is an annular groove, and the auxiliary injection hole is not connected to the central injection hole.

7. The fast-melting particle steel hot-pressed block according to claim 4, characterized in that: The distance between the tip of the inverted cone at the bottom of the central injection hole and the lower end of the block is smaller than the distance between the lower end of the bottom of the auxiliary injection hole and the lower end of the block; The tip of the inverted cone at the bottom of the central injection hole is 30 mm to 90 mm away from the lower end of the block; The lower end of the bottom of the auxiliary injection hole is 60 mm to 120 mm away from the lower end of the block.

8. The fast-melting particle steel hot-pressed block according to claim 4, characterized in that: The upper end diameter of the block is 150 mm to 420 mm; the lower end diameter of the block is 180 mm to 450 mm; the height of the block is 180 mm to 360 mm; The diameter of the upper end of the central injection hole is 35mm to 95mm, and the diameter of the lower end of the central injection hole is 30mm to 90mm; The upper end of the auxiliary pouring hole has a length of 60 mm to 100 mm and a width of 30 mm to 60 mm; and the lower end of the auxiliary pouring hole has a length of 55 mm to 95 mm and a width of 25 mm to 55 mm.

9. The fast-melting particle steel hot-pressed block according to claim 5, characterized in that: The tip of the inverted cone at the bottom of the central injection hole is 30 mm to 100 mm away from the lower end of the block.

10. The fast-melting particle steel hot-pressed block according to claim 5, characterized in that: The upper end diameter of the block is 150 mm to 400 mm; the lower end diameter of the block is 180 mm to 450 mm; the height of the block is 180 mm to 350 mm; The diameter of the upper end of the central pouring hole is 35mm-100mm; the diameter of the lower end of the central pouring hole is 30mm-95mm.

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