Vanadium-aluminum alloy screening device and screening method

Abstract

The invention relates to the field of metallurgical equipment, and provides a vanadium-aluminum alloy screening device and method. The device comprises a crushed alloy blanking articulated chute, a sieve plate, an oversize product discharging chamber and an undersize product discharging chamber, the sieve plate is obliquely arranged between the oversize product discharging chamber and the undersize product discharging chamber, the oversize product discharging chamber is arranged above the sieve surface of the sieve plate, and the undersize product discharging chamber is arranged below the sieve surface of the sieve plate; in the vertical direction, the crushed alloy discharging chute is connected to the oversize product discharging chamber, and the crushed alloy discharging chute is located above the screen plate and is close to the highest point of the screen plate. The invention provides an automatic screening device which is simple in structure and does not consume power, and adopts a step-by-step crushing and step-by-step screening mode to screen out small-particle-size alloy particles after crushing each time, so that the increase of the output fine powder amount in the subsequent crushing process is avoided, the yield is improved, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of metallurgical equipment, and more particularly to a screening device and method for vanadium-aluminum alloy. Background Art

[0002] Vanadium-aluminum master alloy is an important raw material for producing high-strength titanium alloys and is widely used in military, aerospace, and civilian fields. To ensure the uniformity of the composition of titanium alloys, titanium alloy users generally require the particle size of vanadium-aluminum alloy to be 1-6 mm. Therefore, production enterprises need to process alloy cakes to the required particle size range. The final products of alloy cake processing are finished products with particle sizes meeting the requirements and fine powder with particle sizes <1 mm.

[0003] Existing vanadium-aluminum alloy production enterprises process alloy cakes by multi-stage crushing and single-stage screening. In the second and subsequent crushing processes, there is a problem of mixed crushing of alloy blocks with relatively large block sizes and small-particle-size alloy particles, resulting in easier crushing of small-particle-size alloy particles and an increase in the amount of fine powder, which affects the finished product rate of alloy cake processing and the production cost of vanadium-aluminum alloy. Therefore, it is necessary to provide a screening device and method for vanadium-aluminum alloy.

[0004] The prior art discloses a device including an alloy storage bin and a main body of an alloy baking kiln. An alloy vibrating screen is installed between the alloy storage bin and the main body of the alloy baking kiln. The feed inlet of the alloy vibrating screen is connected to the alloy storage bin, and the outlet of the alloy vibrating screen is connected to the alloy receiving port of the main body of the alloy baking kiln; an alloy powder collecting device is provided under the screen surface of the alloy vibrating screen. This device can reduce the powder rate of the alloy used, improve the metal recovery rate, avoid waste of alloy powder, and reduce production costs.

[0005] The prior art discloses a device including a receiving pipe, a material homogenizing bin, and a vibrating screen. The receiving pipe is used to feed vanadium-iron alloy blocks. The material homogenizing bin is movably arranged below the outlet of the receiving pipe, and a vibrator is provided on the bin wall. A bracket for movably connecting the material homogenizing bin is provided at the outlet of the receiving pipe. The vibrating screen is arranged below the outlet of the material homogenizing bin, and the vibrating screen is provided with a screen mesh for allowing vanadium-iron alloy blocks with a particle size grade less than 5 mm to pass through. This device can perform secondary screening on vanadium-iron alloy blocks on the basis of existing screening equipment, screen out vanadium-iron alloy blocks with a particle size grade not less than 5 mm, and avoid waste.

[0006] However, the prior art only relates to the technical problem of reducing alloy powder in screening devices such as the iron and steel industry and vanadium-iron alloy, and does not relate to the screening device and screening process of vanadium-aluminum alloy, and cannot solve the problem of increased fine powder amount in the processing of alloy cakes by multi-stage crushing and single-stage screening. Summary of the Invention

[0007] Based on the above purposes, on the one hand, the present invention provides a screening device for vanadium-aluminum alloy, including: Crushed alloy blanking chute, sieve plate, oversize discharge chamber and undersize discharge chamber; The sieve plate is inclined and arranged between the oversize discharge chamber and the undersize discharge chamber. Above the sieve surface of the sieve plate is the oversize discharge chamber, and below the sieve surface of the sieve plate is the undersize discharge chamber; Vertically, the crushed alloy blanking chute is connected to the oversize discharge chamber. The crushed alloy blanking chute is located above the sieve plate and near the highest point of the sieve plate.

[0008] In some embodiments, the inclination angle formed by the sieve plate and the horizontal plane ranges from 25 to 45°.

[0009] In some embodiments, the sieve plate includes a number of round holes, The thickness range of the sieve plate is 8 - 12 mm; The aperture range of the round holes is 10 - 14 mm.

[0010] In some embodiments, the device further includes a maintenance hatch and an observation window; The maintenance hatch is located on the front side of the oversize discharge chamber close to the sieve plate; The maintenance hatch is located on the left side of the oversize discharge chamber away from the crushed alloy blanking chute.

[0011] In some embodiments, the crushed alloy blanking chute is used to be connected to the lower part of the discharge port of the jaw crusher.

[0012] On the other hand, the present invention proposes a screening method, which can be applied to the device described in any one of the foregoing items. The method includes the following steps: The vanadium-aluminum alloy is subjected to first-stage crushing by a first-stage crusher, and is conveyed to the sieve plate through the crushed alloy blanking chute for first-stage screening. The vanadium-aluminum alloy entering the undersize discharge chamber is used as the first-stage undersize; The vanadium-aluminum alloy entering the oversize discharge chamber is subjected to second-stage crushing and second-stage screening by a second-stage crusher to obtain second-stage undersize; When performing second-stage screening, the vanadium-aluminum alloy in the oversize discharge chamber is subjected to third-stage crushing and third-stage screening by a third-stage crusher to obtain third-stage undersize; The first-stage undersize, second-stage undersize and third-stage undersize are subjected to machine screening to obtain vanadium-aluminum alloy products.

[0013] In some embodiments, the products of machine screening further include remaining coarse materials and fine powder. Among them, the particle size range of the fine powder is less than 1 mm.

[0014] In some embodiments, the remaining coarse materials are cyclically subjected to third-stage crushing and third-stage screening by a third-stage crusher until the remaining coarse materials are consumed.

[0015] In some embodiments, the primary crusher, the secondary crusher, and the tertiary crusher are all jaw crushers.

[0016] In some embodiments, the gap distance between the jaw plates of the primary crusher is set to 26 - 34 mm, the gap distance between the jaw plates of the secondary crusher is set to 14 - 18 mm, and the gap distance between the jaw plates of the tertiary crusher is set to 6 - 10 mm.

[0017] The present invention has at least the following beneficial technical effects: The present invention provides a vanadium-aluminum alloy screening device and a screening method. The device includes: a broken alloy feeding chute, a sieve plate, an oversize discharge chamber, and an undersize discharge chamber; the sieve plate is inclined and arranged between the oversize discharge chamber and the undersize discharge chamber. Above the sieve surface of the sieve plate is the oversize discharge chamber, and below the sieve surface of the sieve plate is the undersize discharge chamber; in the vertical direction, the broken alloy feeding chute is connected to the oversize discharge chamber, and the broken alloy feeding chute is located above the sieve plate and near the highest point of the sieve plate.

[0018] The present invention provides an automatic screening device with a simple structure and no power consumption, and adopts a step-by-step crushing and screening method. Small-sized alloy particles are screened out after each crushing, avoiding an increase in the amount of fine powder produced during subsequent crushing processes, thereby improving the yield and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification, and are used together with the following specific embodiments to explain the present invention, but do not limit the present invention. In the drawings: Figure 1 Shows a structural diagram of a vanadium-aluminum alloy screening device according to an embodiment of the present invention; Figure 2 Shows the flow of a screening method according to an embodiment of the present invention Figure 1 ; Figure 3 Shows the flow of a screening method according to an embodiment of the present invention Figure 2 ; Wherein, 1. Broken alloy feeding chute; 2. Sieve plate; 3. Oversize discharge chamber; 4. Undersize discharge chamber; 5. Maintenance hatch door; 6. Observation window. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following detailed description of the specific embodiments of the present disclosure is provided in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustration and explanation of the present disclosure, and are not used to limit the present disclosure.

[0021] In addition, the mention of "embodiment" in this document means that the specific features, structures, or characteristics described in connection with the embodiment can be included in at least one embodiment of the present invention. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0022] Those skilled in the art of this technology can understand that, unless otherwise defined, all terms used herein (including technical terms and scientific terms) have the same meaning as the general understanding of those of ordinary skill in the field to which this application belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted with an idealized or overly formal meaning unless specifically defined as in the embodiments of this application.

[0023] The present invention provides a screening device for vanadium-aluminum alloy. Please refer to Figure 1 , which includes: a broken alloy blanking chute 1, a sieve plate 2, an oversize discharge chamber 3, and an undersize discharge chamber 4; The sieve plate 2 is inclined and arranged between the oversize discharge chamber 3 and the undersize discharge chamber 4. Above the sieve surface of the sieve plate 2 is the oversize discharge chamber 3, and below the sieve surface of the sieve plate 2 is the undersize discharge chamber 4; In the vertical direction, the broken alloy blanking chute 1 is connected to the oversize discharge chamber 3. The broken alloy blanking chute 1 is located above the sieve plate 2 and near the highest point of the sieve plate 2.

[0024] A screening device for vanadium-aluminum alloy is installed at the lower part of the discharge port of a jaw crusher. A sieve plate 2 with a certain inclination angle is installed at the lower part of the broken alloy blanking chute 1. The sieve plate 2 divides the screening chamber into an oversize discharge chamber 3 and an undersize discharge chamber 4. The screening device for vanadium-aluminum alloy is ingeniously designed and simple in structure. It is installed at the lower part of the discharge port of a jaw crusher. By adjusting the inclination angle of the sieve plate 2, the alloy can make full use of the drop in the channel to achieve automatic screening, and the screening process does not require power consumption.

[0025] By adjusting the inclination angle of the sieve plate 2, automatic screening is achieved by utilizing the self-gravity and drop of the material, without the need for additional electric drive, significantly reducing the operating cost and conforming to the concept of green production. The device is directly integrated below the discharge port of the jaw crusher, eliminating the installation space and complex structure of an independent screening device and reducing the initial investment cost. Without transmission components such as motors and bearings, the failure rate is low, and maintenance only requires adjusting the angle of the sieve plate 2 or replacing the screen mesh, reducing the downtime. The material accelerates and flows in the inclined channel by means of the drop, and the collision and stratification between particles are more sufficient, improving the screening efficiency and accuracy. It is directly linked with the crusher to achieve continuous crushing-screening production, avoiding material accumulation and enhancing the overall production line efficiency.

[0026] In some embodiments, refer to Figure 1 , the inclination angle formed by the sieve plate 2 and the horizontal plane ranges from 25 to 45°. By adjusting the inclination angle of the sieve plate 2, the sliding speed and jumping frequency of the material on the sieve surface can be changed. When the angle increases, the material flow rate accelerates, which is suitable for screening of coarse particle sizes; when the angle decreases, the residence time of the material is prolonged, and the screening of fine particle sizes is more thorough, adapting to different particle size requirements.

[0027] The inclination angle affects the spreading uniformity of the material on the sieve surface. Appropriately adjusting the angle can avoid material accumulation or local overload, prolong the service life of the screen mesh and reduce the risk of blockage.

[0028] In some embodiments, refer to Figure 1 , the sieve plate 2 includes a number of round holes, the thickness range of the sieve plate 2 is 8 - 12 mm; the aperture range of the round holes is 10 - 14 mm.

[0029] By providing sieve plates 2 with different apertures, various particle size requirements from coarse crushing to medium crushing of vanadium-aluminum alloy can be covered, and screening of products with different particle sizes can be completed without replacing the equipment.

[0030] Adapting to the particle size fluctuation of the discharge of the jaw crusher, for example, using large sieve holes to quickly separate large blocks after coarse crushing and using small sieve holes to control the feed particle size before medium crushing. When the sieve hole size matches the particle characteristics of the vanadium-aluminum alloy, the risk of blockage of "near-sieve-hole particles" can be reduced, and the screening rate can be improved.

[0031] In some embodiments, refer to Figure 1 , the device further includes a maintenance hatch 5 and an observation window 6; the maintenance hatch 5 is located on the front of the oversize discharge chamber 3 close to the sieve plate 2; the maintenance hatch 5 is located on the left side of the oversize discharge chamber 3 away from the crushing alloy feeding chute 1.

[0032] A maintenance hatch is provided on the front of the oversize discharge chamber, and an observation window is provided on the side of the oversize discharge chamber.

[0033] The maintenance hatch 5 adopts a hinge or latch structure that can be quickly opened, allowing maintenance personnel to enter the screening channel without disassembling the entire equipment, replacing the sieve plate 2, clearing blockages or inspecting internal worn components, thus shortening the maintenance time.

[0034] Directly view the screening process through the transparent observation window 6 to identify problems such as sieve mesh blockage, uneven material distribution or abnormal vibration, and intervene in advance to avoid the expansion of faults. The observation window 6 is made of high-strength materials such as tempered glass or polycarbonate to resist possible debris splashing during the screening process of vanadium-aluminum alloy and protect the safety of operators.

[0035] In some embodiments, please refer to Figure 1 , the broken alloy feeding chute 1 is used to connect to the lower part of the discharge port of the jaw crusher.

[0036] The broken alloy feeding chute 1 serves as a "bridge" between the crusher and the screening device, enabling the continuous falling of the broken alloy, avoiding material accumulation or interruption, and improving the efficiency of the overall production line. It restricts the range of material splashing and reduces metal loss caused by the scattering of alloy fragments. It relies entirely on gravity and does not require additional conveying equipment, reducing energy consumption and fault points.

[0037] The present invention proposes a screening method, which can be applied to the device described in any one of the foregoing. Please refer to Figure 2 and Figure 3 .

[0038] The vanadium-aluminum alloy is first-stage crushed by a first-stage crusher and conveyed to the sieve plate 2 through the broken alloy feeding chute 1 for first-stage screening. The vanadium-aluminum alloy entering the under-screen discharge chamber 4 is used as the first-stage under-screen material; The vanadium-aluminum alloy entering the over-screen discharge chamber 3 is second-stage crushed and second-stage screened by a second-stage crusher to obtain the second-stage under-screen material; When second-stage screening, the vanadium-aluminum alloy in the over-screen discharge chamber 3 is third-stage crushed and third-stage screened by a third-stage crusher to obtain the third-stage under-screen material; The first-stage under-screen material, the second-stage under-screen material and the third-stage under-screen material are mechanically screened to obtain the vanadium-aluminum alloy finished product.

[0039] Adopt the step-by-step screening method to screen out small-grained alloy particles after each crushing. The steps are as follows: First-order crush the alloy cake, install a vanadium-aluminum alloy screening device below the discharge port of the first-order crushing, and first separate the small-grained alloy particles; then second-order crush the alloy blocks with relatively large particle sizes, install a vanadium-aluminum alloy screening device below the discharge port of the second-order crushing, and then separate the small-grained alloy particles; then third-order crush the crushed alloy blocks, and finally centrally screen the alloy particles after the third-order crushing and the small-grained alloy particles separated after the first-order and second-order crushings by machine, and at the same time return the remaining coarse materials from the machine screening to the third-order cyclic crushing.

[0040] The vanadium-aluminum alloy screening adopts the step-by-step screening method to separate small-grained alloy particles after each crushing, avoiding the mixed crushing of alloy blocks with relatively large particle sizes and small-grained alloy particles, reducing the output of fine powder, increasing the processing yield of the alloy cake, and being beneficial to reducing the production cost of vanadium-aluminum alloy.

[0041] By immediately screening out small-grained alloy particles after each crushing, these particles are prevented from being further refined during the subsequent crushing process, thereby reducing the generation of fine powder. Keeping the particle size distribution of the alloy particles within a suitable range improves the yield and quality of the final product.

[0042] The power-free automatic screening device reduces energy consumption and power cost. Since the generation of fine powder is reduced, the subsequent processing cost is also reduced. In addition, due to the increase in the yield, the production cost per unit product is also correspondingly reduced.

[0043] The design of the step-by-step screening enables the crushing and screening processes to be carried out continuously without manual intervention or additional equipment investment. This simplifies the production process and improves production efficiency. The structure of the device is simple, easy to install and maintain, making the adjustment and optimization of the production line more flexible.

[0044] In some embodiments, refer to Figure 2 and Figure 3 , the products of the machine screening also include remaining coarse materials and fine powder, wherein the particle size range of the fine powder is less than 1 mm.

[0045] Separating the fine powder can prevent it from mixing into the alloy with the target particle size and improve the purity of the finished product. After the fine powder is reduced, the risk of clogging of the screen 2 is reduced, and the ineffective load of the crusher decreases.

[0046] In some embodiments, refer to Figure 2 and Figure 3 , the remaining coarse materials are cycled through the third-order crusher for third-order crushing and third-order screening until the remaining coarse materials are consumed.

[0047] After each crushing, only the large alloy pieces that do not meet the standard are crushed multiple times, and the small-sized particles that meet the standard are separated in a timely manner, reducing their ineffective pulverization in subsequent crushing. Reducing fine powder means that more alloy is recycled in a usable particle size, reducing metal loss.

[0048] The remaining coarse material is returned to the crusher for re-crushing, forming a cycle of "crushing → screening → re-crushing" to prevent large pieces from directly entering the finished product and causing pressing defects.

[0049] In some embodiments, refer to Figure 2 and Figure 3 , the first-stage crusher, the second-stage crusher, and the third-stage crusher are all jaw crushers.

[0050] The jaw plates are made of high manganese steel or alloy castings to adapt to the high hardness of vanadium-aluminum alloy.

[0051] In some embodiments, refer to Figure 2 and Figure 3 , the gap distance between the jaw plates of the first-stage crusher is set to 26 - 34 mm, the gap distance between the jaw plates of the second-stage crusher is set to 14 - 18 mm, and the gap distance between the jaw plates of the third-stage crusher is set to 6 - 10 mm.

[0052] The gap distance between the jaw plates of the first-stage crusher is 26 - 34 mm, crushing the alloy cake to 0 - 40 mm; the gap distance between the jaw plates of the second-stage crusher is 14 - 18 mm, crushing the 10 - 40 mm alloy blocks to 0 - 22 mm; the gap distance between the jaw plates of the third-stage crusher is 6 - 10 mm, crushing the 10 - 22 mm alloy blocks to 0 - 12 mm, and then cyclically crushing the 6 - 12 mm alloy blocks to 0 - 6 mm. During the production process, by optimizing the spacing of the jaw plates of the crusher and controlling the decreasing ratio of the particle size gradient of the alloy blocks discharged from each stage of crushing, the output of fine powder can be reduced.

[0053] In some embodiments, refer to Figure 1 , Figure 2 and Figure 3 , the input amount of Panzhihua Steel vanadium-aluminum alloy cake is 1258 kg. Using the method of stage crushing and stage screening, the gap of the jaw plates of the first-stage crusher is 30 mm, and the aperture of the screen plate of the first-stage screening device is 10 mm; the gap of the jaw plates of the second-stage crusher is 16 mm, and the aperture of the screen plate of the second-stage screening device is 10 mm; the gap of the jaw plates of the third-stage crusher is 8 mm, and the remaining coarse material from the machine screening is cyclically crushed. The output of fine powder is counted as 131 kg, and the fine powder rate is 10.41%. Compared with the method of multi-stage crushing and single screening, the fine powder rate is reduced by 4.05%.

[0054] The present technology provides a vanadium-aluminum alloy screening device and a screening method. The device is ingeniously designed and has a simple structure. It is installed below the discharge port of a jaw crusher. By adjusting the inclination angle of the sieve plate, the alloy can make full use of the drop in the channel to achieve automatic screening, and the screening process does not require power consumption. The screening method mainly adopts the step-breaking and step-screening method. After each crushing, small-grain alloy particles are separated, avoiding the mixed crushing of alloy blocks with relatively large particle sizes and small-grain alloy particles, reducing the output of fine powder, thereby increasing the finished product rate of alloy cakes and being beneficial to reducing the production cost of vanadium-aluminum alloy. After the implementation of this technology, it is beneficial to reduce the output of fine powder and has strong popularization and application value in the physical processing of other alloy crushing and screening.

[0055] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0056] In addition, it should be noted that, among the various specific technical features described in the above specific embodiments, they can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.

[0057] In addition, any combination can be made between various different embodiments of the present invention as long as it does not violate the idea of the present invention, and it should also be regarded as the content disclosed by the present invention.

Claims

1. A vanadium-aluminum alloy screening device, characterized in that: include, A crushed alloy discharge chute (1), a screen plate (2), an oversize discharge chamber (3), and an undersize discharge chamber (4); The sieve plate (2) is arranged obliquely between an oversize material discharge chamber (3) and an undersize material discharge chamber (4); the oversize material discharge chamber (3) is located above the sieve surface of the sieve plate (2), and the undersize material discharge chamber (4) is located below the sieve surface of the sieve plate (2); In the vertical direction, the crushed alloy discharge chute (1) is connected to the screen material discharge chamber (3), and the crushed alloy discharge chute (1) is located above the screen plate (2) and close to the highest point of the screen plate (2).

2. The vanadium-aluminum alloy screening device according to claim 1, characterized in that: The inclined angle formed by the sieve plate (2) and the horizontal plane ranges from 25 to 45 degrees.

3. The vanadium-aluminum alloy screening device according to claim 1, characterized in that: The sieve plate (2) comprises a plurality of circular holes. The thickness of the sieve plate (2) is in the range of 8-12 mm; The diameter of the circular hole is in the range of 10-14 mm.

4. The vanadium-aluminum alloy screening device according to claim 1, characterized in that: The device also includes an inspection compartment door (5) and an observation window (6); The inspection door (5) is located on the front side of the screen material discharge chamber (3) close to the screen plate (2); The inspection compartment door (5) is located on the left side of the oversize material discharge chamber (3) away from the crushed alloy discharge chute (1).

5. The vanadium-aluminum alloy screening device according to claim 1, characterized in that: The crushed alloy discharge chute (1) is used to be connected to the lower part of the discharge port of the jaw crusher.

6. A screening method, the screening method being applied to the device according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: The vanadium-aluminum alloy is first-stage crushed by a first-stage crusher, and is transported to the sieve plate (2) through the crushed alloy discharge chute (1) for first-stage screening, and the vanadium-aluminum alloy entering the undersize material discharge chamber (4) is regarded as the first-stage undersize material; The vanadium-aluminum alloy entering the oversize material discharge chamber (3) is subjected to secondary crushing and secondary screening by a secondary crusher to obtain a secondary undersize material; During the second-stage screening, the vanadium-aluminum alloy in the screen-surface discharge chamber (3) is subjected to third-stage crushing and third-stage screening by a third-stage crusher to obtain a third-stage screen-surface; The first-order undersize, the second-order undersize and the third-order undersize are machine-screened to obtain a vanadium-aluminum alloy finished product.

7. The screening method according to claim 6, characterized in that: The products of machine screening also include residual coarse material and fine powder, wherein the particle size range of the fine powder is less than 1 mm.

8. The screening method according to claim 7, characterized in that: The remaining coarse material is cyclically crushed and screened in three stages through a three-stage crusher until the remaining coarse material is consumed.

9. The screening method according to claim 6, characterized in that: The first-stage crusher, the second-stage crusher and the third-stage crusher are all jaw crushers.

10. The screening method according to claim 6, characterized in that: The gap distance between the jaw plates of the first-stage crusher is set to 26-34 mm, the gap distance between the jaw plates of the second-stage crusher is set to 14-18 mm, and the gap distance between the jaw plates of the third-stage crusher is set to 6-10 mm.

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