A ball pressing device for processing vanadium-nitrogen alloy

Abstract

The present invention provides a briquetting device for processing vanadium-nitrogen alloys, belonging to the technical field of vanadium-nitrogen alloy processing. The device comprises a frame, a main forming roller, an auxiliary forming roller, and a secondary feed roller. The horizontal plane containing the axis of the main forming roller and the horizontal plane containing the axis of the auxiliary forming roller form an inclination angle of 0 to 20°, with the horizontal plane containing the axis of the main forming roller being located below the horizontal plane containing the axis of the auxiliary forming roller. The horizontal plane containing the axis of the main forming roller and the horizontal plane containing the axis of the secondary feed roller form an inclination angle of 10 to 40°, with the horizontal plane containing the axis of the main forming roller being located below the horizontal plane containing the axis of the secondary feed roller. The frame includes a primary feed cavity located below the tangent line between the main forming roller and the auxiliary forming roller, and a secondary feed area formed above the tangent line between the main forming roller and the secondary feed roller. The present invention has advantages such as high ball forming reliability.

Description

Technical Field

[0001] The invention belongs to the technical field of vanadium-nitrogen alloy processing, and relates to a ball pressing device for vanadium-nitrogen alloy processing. Background Art

[0002] Vanadium-nitrogen alloy is a steel additive used to improve the strength, toughness, weldability, etc. of steel, thereby reducing steelmaking production costs.

[0003] During the processing of vanadium-nitrogen alloy, vanadium oxide powder (such as vanadium pentoxide), carbonaceous reducing agent (such as graphite), binder (such as water), promoter (such as iron powder) and the like are stirred and evenly mixed, pressed into balls by a briquetting machine, and then incinerated in a nitrogen environment to form vanadium-nitrogen alloy balls.

[0004] Existing briquetting machines use a double-die roller structure with a die opening on the surface of the rollers. When the two rollers gradually close, the powder mixture is compacted and formed in the die cavity, and the material is discharged at the point where the two rollers gradually open. Since the volume of the powder mixture (the main raw material is vanadium oxide) is greatly reduced after incineration, the density of the powder mixture determines whether the vanadium-nitrogen alloy balls after incineration have good shape retention. If the pressing density is not enough, it is easy for the powder mixture to become loose after incineration, resulting in a lot of slag in the finished product. At the same time, a low pressing density will also affect the utilization rate of the incinerator. For this reason, in the existing vanadium-nitrogen alloy processing process, the powder mixture needs to be pressed into balls multiple times. Specifically, the material is pressed multiple times in sequence, and the cavity of the double-die rollers used for pressing is gradually increased. The small-sized pressed balls formed in the previous round are placed between the next double-die rollers with a larger cavity. At the same time, new powder is added, and the pressed balls are pressed again to increase the volume and density of the balls. After multiple pressings, pressed balls with a set volume and high density are formed.

[0005] The above-mentioned existing means not only require multiple material transportation (the vanadium balls formed in the previous time need to be transported to the next double-die roller), but also have a complex structure and the multi-stage pressing equipment occupies a large area. Moreover, the vanadium balls formed in the previous time are easy to loosen during transportation, forming a large amount of slag. In addition, the ball density of this method is uneven, and there is a problem that some vanadium balls cannot reach the compaction degree. This is because when the vanadium balls formed in the previous time enter the next double-die roller, it is difficult to ensure that they can accurately match the cavity formed by the double-die roller. If the vanadium balls cannot fall accurately into the cavity of the next molding, it is easy to cause the vanadium balls formed by the previous double-die roller to be crushed (the vanadium balls are crushed when the double rollers gradually close), so that the vanadium balls discharged by the double-die roller are not formed by re-pressing on the basis of the vanadium balls discharged by the previous double-die roller, resulting in their compaction degree not meeting the requirements.

[0006] In summary, the existing technology of improving the compactness of vanadium balls by multiple pressing and feeding has the problems of unstable quality and a large amount of slag (needing to be recycled and re-pressed). At the same time, there are also defects such as the need to transport materials multiple times and occupying a large space. The existing technology adopts a method of increasing the feeding pressure of the powder to improve the pressing and molding strength, that is, the material is squeezed during feeding so that the pressure of the material entering the die when the double rollers are gradually converging is greater, thereby improving the compactness of the vanadium balls after molding. However, the feeding position is the gradual convergence area of ​​the double rollers, and the mold rollers are moving parts. In addition, the cavity formed by the double rollers is not completely closed (even the cavity formed at the tangential position of the double rollers is not completely closed). Therefore, the feeding pressure cannot be too large, otherwise the material cavity will be discharged at the opening of the discharge end (the position where the double rollers are gradually opened). The greater the speed of the rollers, the more obvious this unloading situation is, and the effect of increasing the feeding pressure to improve the compactness of the vanadium balls is smaller. Therefore, increasing the feeding pressure itself has a lower pressure upper limit, and it will also conflict with the speed of the rollers (ball pressing efficiency).

[0007] Therefore, it is a common practice in the current industry to use multi-stage ball pressing to improve the compactness and size of vanadium balls. This application is an improvement based on the defects of the existing multi-stage ball pressing method. Summary of the Invention

[0008] The purpose of the present invention is to provide a ball pressing device for vanadium nitrogen alloy processing in order to solve the above problems existing in the existing technology. The technical problem to be solved by the present invention is how to improve the compactness of vanadium ball forming.

[0009] The objectives of the present invention can be achieved through the following technical solutions: A ball pressing device for processing vanadium-nitrogen alloy, characterized in that it includes a frame, a main forming roller, an auxiliary forming roller and a secondary feeding roller; the horizontal plane where the axis of the main forming roller is located is inclined at an angle of 0 to 20 degrees to the horizontal plane where the axis of the auxiliary forming roller is located, and the horizontal plane where the axis of the main forming roller is located is located below the horizontal plane where the axis of the auxiliary forming roller is located; the horizontal plane where the axis of the main forming roller is located is inclined at an angle of 10 to 40 degrees to the horizontal plane where the axis of the secondary feeding roller is located, and the horizontal plane where the axis of the main forming roller is located is located below the horizontal plane where the axis of the secondary feeding roller is located; the frame has a primary feeding cavity located below the tangent line between the main forming roller and the auxiliary forming roller, and a secondary feeding area is formed above the tangent line between the main forming roller and the secondary feeding roller;

[0010] The end of the main forming roller is provided with a gear 1, the end of the auxiliary forming roller is provided with a gear 2, the end of the secondary feeding roller is provided with a gear 3, and the gear 1 is engaged with the gear 2 and the gear 3 at the same time.

[0011] Furthermore, the vanadium balls formed by the ball pressing device are cylindrical with both end faces having convex curved surfaces. Several molding openings are distributed on the circumferential surfaces of the main forming roller, the auxiliary forming roller and the secondary feeding roller. The molding openings correspond to the half bodies of the vanadium balls that are beveled along the diagonal lines of the cylindrical surfaces of the vanadium balls. The molding openings have a bottom surface corresponding to the convex curved surface of the vanadium balls and a supporting surface that gradually narrows at both ends. The widest part of the supporting surface on the main forming roller is located on the side of the molding opening away from the rotation direction of the main forming roller.

[0012] Furthermore, a slag discharge plate is provided on the outer side of the auxiliary forming roller.

[0013] Furthermore, a vanadium ball discharge plate is provided below the separation zone between the main forming roller and the secondary feeding roller, and a filter screen is provided in the middle section of the vanadium ball discharge plate.

[0014] Furthermore, the horizontal plane where the axis of the main forming roller is located and the horizontal plane where the axis of the auxiliary forming roller is located form an inclination angle of 10°.

[0015] Furthermore, the horizontal plane where the axis of the main forming roller is located and the horizontal plane where the axis of the secondary feeding roller is located form an inclination angle of 25°.

[0016] Furthermore, a secondary feeding hopper of the secondary feeding area is provided on the frame.

[0017] Furthermore, the primary feeding cavity adopts a screw extrusion method, and the primary feeding cavity is connected to a primary feeding hopper.

[0018] The essence of this solution is to use a three-roller structure to add powder twice, so that the vanadium balls formed once can be added with powder for the second time without leaving the main forming roller die, thereby greatly reducing the size of the equipment and the occupied space, and also eliminating the need for the off-roller transportation of the once-formed vanadium balls; in addition, the die sizes of the rollers in this device are consistent, and powder is added again to the already formed vanadium balls for pressing to increase their compactness after forming. Compared with the traditional multi-stage ball pressing device, the secondary powder addition in this solution is carried out after the vanadium balls have been formed to the specified size once, and the secondary added powder is based on compressing the once-formed vanadium balls to compactness. Compared with the gradual increase in the size of the vanadium balls, the compactness of the vanadium balls is higher and the forming is more reliable.

[0019] The positioning of the rollers ensures that the vanadium balls after the primary forming roller and the auxiliary forming roller complete the first forming process will not fall out of the die of the primary forming roller, or at least will have a high probability of doing so. This ensures that when the primary forming roller and the secondary feed roller gradually converge, the new powder in the die of the secondary feed roller can merge with the primary formed vanadium balls to form a more compact finished vanadium ball. The die design further increases the probability that the vanadium balls after the primary forming roller and the auxiliary forming roller complete the first forming process will not fall out of the die of the primary forming roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of this ball pressing device.

[0021] Figure 2 It is a schematic diagram of the running direction of the three rollers.

[0022] Figure 3 It is a schematic diagram of the relative positions of the three rollers.

[0023] Figure 4 It is a three-dimensional schematic diagram of a vanadium ball.

[0024] Figure 5 yes Figure 2 Enlarged view of part A in the middle.

[0025] Figure 6 The die shape corresponds to the schematic diagram of dividing the vanadium ball into half (the dotted line is the dividing line between the two halves).

[0026] In the figure, 1. frame; 2. main forming roller; 3. auxiliary forming roller; 4. secondary feeding roller; 51. gear 1; 52. gear 2; 53. gear 3; 6. die; 61. bottom surface; 62. supporting surface; 71. slag discharge plate; 72. vanadium ball discharge plate; 73. filter screen; 81. primary feeding hopper; 82. secondary feeding hopper; 9. primary feeding cavity. DETAILED DESCRIPTION

[0027] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0028] like Figures 1 to 6 As shown, the ball pressing device for vanadium nitrogen alloy processing includes a frame 1, a main forming roller 2, an auxiliary forming roller 3 and a secondary feeding roller 4; the horizontal plane where the axis of the main forming roller 2 is located and the horizontal plane where the axis of the auxiliary forming roller 3 is located are inclined at an angle of 10 degrees (as shown in FIG. Figure 3 The horizontal plane where the axis of the main forming roller 2 is located is below the horizontal plane where the axis of the auxiliary forming roller 3 is located; the horizontal plane where the axis of the main forming roller 2 is located and the horizontal plane where the axis of the secondary feeding roller 4 is located are inclined at a 25° angle (as shown in the figure). Figure 3 The horizontal plane where the axis of the main forming roller 2 is located is below the horizontal plane where the axis of the secondary feeding roller 4 is located; the frame 1 has a primary feeding cavity 9 located below the tangent line between the main forming roller 2 and the auxiliary forming roller 3, and a secondary feeding area is formed above the tangent line between the main forming roller 2 and the secondary feeding roller 4;

[0029] The end of the main forming roller 2 has a gear 1 51, the end of the auxiliary forming roller 3 has a gear 2 52, and the end of the secondary feeding roller 4 has a gear 3 53. The gear 1 51 is engaged with the gear 2 52 and the gear 3 53 at the same time.

[0030] The vanadium balls formed by this ball pressing device are cylindrical with both end faces having convex curved surfaces. Several mold openings 6 are distributed on the circumferential surfaces of the main forming roller 2, the auxiliary forming roller 3 and the secondary feeding roller 4. The mold openings 6 correspond to the half bodies of the vanadium balls that are beveled along the diagonal lines of the cylindrical surfaces of the vanadium balls. The mold openings 6 have a bottom surface 61 corresponding to the convex curved surface of the vanadium balls and a supporting surface 62 with gradually narrowing ends; the widest part of the supporting surface 62 on the main forming roller 2 is located on the side of the mold opening 6 away from the rotation direction of the main forming roller 2. Since the rotation relationship among the main forming roller 2, the auxiliary forming roller 3 and the secondary feeding roller 4 is determined, the widest part of the support surface 62 on the main forming roller 2 is located on the side of the die 6 away from the rotation direction of the main forming roller 2, so that after the main forming roller 2 and the auxiliary forming roller 3 gradually separate, the support surface 62 of the main forming roller 2 effectively supports the vanadium balls, while the auxiliary forming roller 3 cannot continue to carry the vanadium balls because the support surface 62 faces upward. In the merging area of ​​the active forming roller and the secondary feeding roller 4, the die 6 support surface 62 of the main forming roller 2 is about to have a large inclination angle and is unable to carry the vanadium balls well, and is tangent to the secondary feeding roller 4. Here, the die 6 support surface 62 on the secondary feeding roller 4 faces downward, which is conducive to the loading of the powder into the die 6 on the secondary feeding roller 4.

[0031] A slag discharge plate 71 is provided on the outside of the auxiliary forming roller 3 , and a very small number of vanadium balls and powder slag at the die 6 of the auxiliary forming roller 3 are discharged from the slag discharge plate 71 for collection and re-feeding.

[0032] A vanadium ball discharge plate 72 is provided below the gradual separation zone between the primary forming roller 2 and the secondary feeding roller 4. A filter screen 73 is provided in the middle of the vanadium ball discharge plate 72. The filter screen 73 separates the slag formed by the running and falling of the vanadium balls.

[0033] The frame 1 is provided with a secondary feeding hopper 82 in the secondary feeding area, and the outlet of the secondary feeding hopper 82 is aligned with the position above the tangent of the secondary feeding roller 4 and the main forming roller 2, and the material falls into the mold 6 of the secondary forming roller; the primary feeding chamber adopts a screw extrusion method, and the primary feeding chamber is connected to a primary feeding hopper 81; since the primary feeding chamber is located below the tangent of the main forming roller 2 and the auxiliary forming roller 3, the gravity of the material will cause the entry pressure of the powder to be relatively small, therefore, a screw feeding method is adopted to ensure that the material in the primary feeding chamber remains full and compact; a motor is provided on the frame, and the motor drives gear 2 to rotate. At the same time, the motor also drives the feeding screw to rotate.

[0034] The essence of this solution is to use a three-roller structure to add powder twice, so that the vanadium ball formed once can be added with powder for the second time without leaving the die 6 of the main forming roller 2, thereby greatly reducing the size and occupied space of the equipment, and eliminating the need for the off-roller transportation of the once-formed vanadium ball; in addition, the die 6 of each roller in this device has the same size, and powder is added again to the already formed vanadium ball for pressing to increase its compactness after forming. Compared with the traditional multi-stage ball pressing device, the secondary powder addition in this solution is carried out after the vanadium ball has been formed to the specified size once, and the secondary added powder is based on compressing the once-formed vanadium ball to compactness. Compared with the gradual increase in the size of the vanadium ball, the vanadium ball has a higher compactness and is more reliable in forming.

[0035] The positioning of the rollers ensures that the vanadium balls, after primary forming by the primary forming rollers 2 and the auxiliary forming rollers 3, do not escape from the die 6 of the primary forming rollers 2, or, more accurately, do so with a high probability. This ensures that when the primary forming rollers 2 and the secondary feed rollers 4 converge, the new powder within the die 6 of the secondary feed rollers 4 can merge with the primary formed vanadium balls to form a more compact finished vanadium ball. The design of the die 6 further increases the probability that the vanadium balls, after primary forming by the primary forming rollers 2 and the auxiliary forming rollers 3, will not escape from the die 6 of the primary forming rollers 2.

[0036] This solution designs the shape of the vanadium ball. There is no fixed standard for the shape of the vanadium ball. It is mainly considered that it has a larger heating area during incineration and can be supported to form a ventilation gap when piled up in the incineration box. The design of the die 6 of each roller in this solution has better demoulding characteristics than the traditional symmetrical design, that is, the die of each roller is cut along the perpendicular plane to the axis of the vanadium ball.

[0037] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A ball pressing device for processing vanadium nitrogen alloy, characterized in that: The invention comprises a frame (1), a main forming roller (2), an auxiliary forming roller (3) and a secondary feeding roller (4); the horizontal plane where the axis of the main forming roller (2) is located and the horizontal plane where the axis of the auxiliary forming roller (3) is located are inclined at an angle of 0 to 20 degrees, and the horizontal plane where the axis of the main forming roller (2) is located is located below the horizontal plane where the axis of the auxiliary forming roller (3) is located; the horizontal plane where the axis of the main forming roller (2) is located and the horizontal plane where the axis of the secondary feeding roller (4) is located are inclined at an angle of 10 to 40 degrees, and the horizontal plane where the axis of the main forming roller (2) is located is located below the horizontal plane where the axis of the secondary feeding roller (4) is located; the frame (1) is provided with a primary feeding cavity (9) located below the tangent line between the main forming roller (2) and the auxiliary forming roller (3), and a secondary feeding area is formed above the tangent line between the main forming roller (2) and the secondary feeding roller (4); The end of the main forming roller (2) has a gear 1 (51), the end of the auxiliary forming roller (3) has a gear 2 (52), and the end of the secondary feeding roller (4) has a gear 3 (53), and the gear 1 (51) is engaged with the gear 2 (52) and the gear 3 (53) at the same time.

2. The ball pressing device for processing vanadium-nitrogen alloy according to claim 1, characterized in that: The vanadium balls formed by the ball pressing device are cylindrical with both end faces being convex curved surfaces. A plurality of die openings (6) are distributed on the peripheral surfaces of the main forming roller (2), the auxiliary forming roller (3) and the secondary feeding roller (4). The die openings (6) correspond to the half bodies of the vanadium balls that are cut along the diagonal lines of the cylindrical surfaces of the vanadium balls. The die openings (6) have a bottom surface (61) corresponding to the convex curved surface of the vanadium balls and a supporting surface (62) with gradually narrowing ends. The widest part of the supporting surface (62) on the main forming roller (2) is located on the side of the die opening (6) away from the rotation direction of the main forming roller (2).

3. A ball pressing device for processing vanadium nitrogen alloy according to claim 1 or 2, characterized in that: A slag discharge plate (71) is provided on the outer side of the auxiliary forming roller (3).

4. A ball pressing device for processing vanadium-nitrogen alloy according to claim 1 or 2, characterized in that: A vanadium ball discharge plate (72) is provided below the separation zone between the primary forming roller (2) and the secondary feeding roller (4), and a filter screen (73) is provided in the middle section of the vanadium ball discharge plate (72).

5. The ball pressing device for processing vanadium-nitrogen alloy according to claim 1, characterized in that: The horizontal plane where the axis of the main forming roller (2) is located and the horizontal plane where the axis of the auxiliary forming roller (3) is located form an inclination angle of 10°.

6. The ball pressing device for processing vanadium-nitrogen alloy according to claim 1, characterized in that: The horizontal plane where the axis of the main forming roller (2) is located and the horizontal plane where the axis of the secondary feeding roller (4) is located form an inclination angle of 25°.

7. A ball pressing device for processing vanadium nitrogen alloy according to claim 1 or 2, characterized in that: The frame (1) is provided with a secondary feeding hopper (82) of a secondary feeding area.

8. A ball pressing device for processing vanadium nitrogen alloy according to claim 1 or 2, characterized in that: The primary feeding cavity adopts a screw extrusion method, and the primary feeding cavity is connected to a primary feeding hopper (81).

Images