Double-roller type crusher capable of uniformly discharging and crushing method of double-roller type crusher

Abstract

The invention relates to the technical field of double-roller crushing, in particular to a uniform-discharging double-roller crusher and a crushing method thereof.The uniform-discharging double-roller crusher comprises a shell and a feeding hopper which is fixed to the top of the shell and communicates with the shell; the double-roller crushing mechanism is arranged on the shell, a first crushing roller and a second crushing roller are connected to the double-roller crushing mechanism, and the double-roller crushing mechanism can adjust the distance between the second crushing roller and the first crushing roller and drive the first crushing roller and the second crushing roller to rotate reversely; the screening mechanism is arranged in the shell, and a screen is connected to the screening mechanism; and the driven assembly is arranged on the shell and connected with the double-roller crushing mechanism and the screening mechanism, and when the circuit board is crushed, the driven assembly controls a screen to vibrate in a reciprocating mode through the screening mechanism and executes reciprocating tensioning and loosening actions at the same time, so that it is guaranteed that materials can be smoothly screened, and it is guaranteed that the obtained particle size is uniform.

Description

Technical Field

[0001] This invention relates to the field of double-roll crushing technology, specifically a double-roll crusher with uniform feeding and its crushing method. Background Technology

[0002] Waste circuit boards, as a typical type of electronic waste, contain valuable metals such as copper, gold, and silver, as well as non-metallic components such as plastics and glass fibers. They have high resource recycling value, and their resource recycling process usually includes crushing, sorting, and smelting.

[0003] Crushing is a key pretreatment step, designed to break down waste circuit boards into suitable particle sizes so that they can be efficiently sorted based on particle size or density differences and finally fed into equipment such as top-blown smelting furnaces to recover metals. Roll crushers are widely used in the primary or secondary crushing stages of waste circuit boards because they have the characteristics of uniform particle size, less over-crushing, and large processing capacity.

[0004] In the prior art, the double-roll crusher used for crushing waste circuit boards usually conveys the crushed material to a vibrating screen for screening to avoid incompletely crushed material from being mixed in with the effectively crushed material. However, when the vibrating screen processes the crushed circuit board material, it is prone to problems such as screen hole blockage and difficulty in fine particles passing through the screen due to the characteristics of the material (such as flat shape, fiber content, and easy entanglement), resulting in low screening efficiency and the need for frequent manual cleaning of unqualified materials. Summary of the Invention

[0005] The purpose of this invention is to provide a double-roll crusher with uniform feeding and a crushing method thereof, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a double-roll crusher with uniform feeding, comprising: a shell, and a feed hopper fixed to the top of the shell and communicating with the shell; further comprising: a double-roll crushing mechanism disposed on the shell, wherein a first crushing roller and a second crushing roller are connected to the double-roll crushing mechanism, the double-roll crushing mechanism being able to adjust the distance between the second crushing roller and the first crushing roller, and drive the first crushing roller and the second crushing roller to perform opposite rotation actions; a screening mechanism disposed within the shell, wherein a screen is connected to the screening mechanism; and a driven component disposed on the shell and connected to the double-roll crushing mechanism and the screening mechanism, wherein the driven component is able to perform tensioning and slacking actions on the screen through the screening mechanism when the double-roll crushing mechanism is moving.

[0007] As a further aspect of the present invention: the roller crushing mechanism includes a first motor fixed to the outer wall of the housing, a first transmission rod rotatably mounted inside the housing and connected to the output shaft of the first motor, the first transmission rod being fixedly connected to the first crushing roller; it also includes a drive assembly and a push assembly disposed on the housing.

[0008] As a further embodiment of the present invention: the drive assembly includes a first sliding groove formed on the outer wall of the housing, a sliding block slidably installed in the first sliding groove, a fixing plate fixed on the sliding block, a second motor fixed on the fixing plate, and a second transmission rod rotatably installed on the sliding block and connected to the output shaft of the second motor, the second transmission rod being fixedly connected to the second crushing roller.

[0009] As a further embodiment of the present invention: the pushing assembly includes a cylinder fixed to the outer wall of the housing, and a rotating sleeve is rotatably mounted on the second transmission rod, the rotating sleeve being fixedly connected to the telescopic end of the cylinder.

[0010] As a further embodiment of the present invention: the driven component includes a rotating rod rotatably mounted in the housing, a toothed belt connected to the first transmission rod is sleeved on the rotating rod, and a cam is fixed on the rotating rod.

[0011] As a further embodiment of the present invention: the screening mechanism includes receiving rods fixed inside the housing and arranged symmetrically, the receiving rods being fixedly connected to both ends of the screen; it also includes an elastic component and a follower component disposed on the housing and connected to the screen.

[0012] As a further embodiment of the present invention: the elastic component includes a second sliding groove formed on the outer wall of the housing, a movable block is slidably installed in the second sliding groove, and a spring is fixed in the second sliding groove, with the two ends of the spring abutting against the movable block and the side wall of the second sliding groove, respectively.

[0013] As a further embodiment of the present invention: the follower component includes a movable rod fixed on the movable block, the movable rod being fixedly connected to the screen, and a limit wheel being fixed at the end of the movable rod, the limit wheel engaging with the cam.

[0014] As a further embodiment of the present invention: a storage box for holding materials that have not passed through the sieve is fixed inside the housing.

[0015] A method for uniformly feeding double-roll crushing includes the following steps: Step 1: Adjust the distance between the first and second crushing rollers using the roller crushing mechanism according to the required particle size. Step 2: Add the waste circuit board to be crushed into the housing through the feed hopper. At the same time, the roller crushing mechanism is activated and drives the first crushing roller and the second crushing roller to rotate in opposite directions to crush the waste motor board. Step 3: The crushed circuit board falls onto the screen for screening. Under the action of the roller crushing mechanism, the driven component moves, thereby driving the screening mechanism to control the screen to perform reciprocating tensioning and relaxation actions. Step 4: After screening, the material is weighed by a weighing scale and then conveyed to a top-blown smelting furnace for resource recovery.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: When screening crushed materials, the present invention can control the screen to reciprocate the tensioning and relaxation actions to ensure screening efficiency while automatically separating materials with larger particle sizes. Through the cooperation of the driven component and the screening mechanism, the screen can be controlled to periodically and dynamically switch between the "W-shaped relaxation" and "triangular tension" states. This not only generates strong compound vibration (vertical impact and horizontal shearing), which greatly promotes the passage of fine particles through the screen and improves screening efficiency and accuracy, but more importantly, the inclined surface formed in the tensioned state naturally guides larger particles and uncrushed materials to slide to the edge and fall into the collection box, realizing the automatic and continuous separation and collection of unqualified materials, effectively preventing the screen center from clogging and ensuring the continuity of operation.

[0017] The roller crushing mechanism can control the reverse rotation of the two rollers and adjust the distance between them. Due to the adjustability of the gap between the first and second crushing rollers, the position of the second crushing roller relative to the first crushing roller can be precisely controlled by the cylinder, thereby achieving online and stepless adjustment of the target particle size of the final crushed product to adapt to different subsequent processing technologies and production needs. Attached Figure Description

[0018] Figure 1 A schematic diagram of one embodiment of a double-roll crusher for uniform material feeding; Figure 2 A schematic diagram of the structure of a double-roll crusher for uniform material feeding at another angle in one embodiment; Figure 3 A schematic cross-sectional view of the feed hopper and shell in one embodiment of a double-roll crusher for uniform material feeding; Figure 4 for Figure 3 Enlarged structural diagram at point A; Figure 5 A schematic diagram showing the connection relationship between the double-roll crushing mechanism, the driven component, and part of the screening mechanism in one embodiment of a double-roll crusher for uniform material feeding; Figure 6A schematic diagram of the structure of the double-roll crushing mechanism and part of the screening mechanism in one embodiment of a double-roll crusher for uniform material feeding; Figure 7 A schematic diagram of the structure of the double-roll crushing mechanism in one embodiment of a double-roll crusher for uniform material feeding; Figure 8 A schematic diagram of the screening mechanism and some driven components in one embodiment of a double-roll crusher for uniform material feeding; Figure 9 This is a schematic diagram of the structure of part of the screening mechanism and part of the driven component in one embodiment of a double-roll crusher for uniform material feeding.

[0019] In the diagram: 1. Shell; 101. First chute; 102. Second chute; 2. Feed hopper; 3. First motor; 4. First transmission rod; 5. First crushing roller; 6. Sliding block; 7. Second motor; 8. Second transmission rod; 9. Cylinder; 10. Second crushing roller; 11. Rotating rod; 12. Cam; 13. Movable block; 14. Movable rod; 15. Limiting wheel; 16. Spring; 17. Receiving rod; 18. Screen; 19. Storage box; 20. Toothed belt. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Furthermore, elements in this invention are referred to as being "fixed to" or "set on" another element, which may be directly on the other element or may also include an intervening element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or may also include an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0022] Please see Figures 1-9In this embodiment of the invention, a uniformly feeding double-roll crusher includes: a housing 1, and a feed hopper 2 fixed to the top of the housing 1 and communicating with the housing 1; it also includes: a double-roll crushing mechanism disposed on the housing 1, wherein a first crushing roller 5 and a second crushing roller 10 are connected to the double-roll crushing mechanism, the double-roll crushing mechanism can adjust the distance between the second crushing roller 10 and the first crushing roller 5, and drive the first crushing roller 5 and the second crushing roller 10 to perform opposite rotation actions; a screening mechanism disposed inside the housing 1, wherein a screen 18 is connected to the screening mechanism; and a driven component disposed on the housing 1 and connected to the double-roll crushing mechanism and the screening mechanism, wherein the driven component can perform tensioning and relaxation actions on the screen 18 through the screening mechanism when the double-roll crushing mechanism is moving.

[0023] The housing 1 is fixed with a storage box 19 for holding materials that have not passed through the screen 18.

[0024] Specifically, when recycling waste circuit boards, they need to be crushed. During crushing, the distance between the first crushing roller 5 and the second crushing roller 10 can be adjusted according to the required particle size using a roller crushing mechanism. After adjustment, the waste circuit boards are added into the housing 1 through the feed hopper 2. At this time, the roller crushing mechanism controls the first crushing roller 5 and the second crushing roller 10 to rotate in opposite directions. Under the action of the first crushing roller 5 and the second crushing roller 10, shearing force is provided to the waste circuit boards, causing them to be crushed into the required particle size. The crushed circuit boards will fall onto the screen 18 and undergo screening. Because some circuit boards may not be fully crushed during the crushing process, the particle size may vary. If the diameter exceeds the set value, this part of the circuit board will accumulate on the screen 18. The roller crushing mechanism will also drive the driven component to move, and through the driven component, drive the screening mechanism to move, so as to control the screen 18 to reciprocate and vibrate, and at the same time control the screen 18 to perform reciprocating tensioning action. In this way, the screening efficiency can be improved to ensure that the material of the required particle size can pass through the screen 18, and the larger particle size material on the screen 18 can be controlled to leave the screen 18 and enter the collection box 19, thereby avoiding the problem of screening failure due to material accumulation on the screen 18. When the larger particle size material enters the collection box 19, this part of the material can be transported again through the feed hopper 2 to the shell 1 for secondary crushing, thereby ensuring the fullness of crushing.

[0025] Please see Figures 1-3 , Figures 5-7The roller crushing mechanism includes a first motor 3 fixed to the outer wall of the housing 1, a first transmission rod 4 rotatably mounted inside the housing 1 and connected to the output shaft of the first motor 3, and the first transmission rod 4 fixedly connected to the first crushing roller 5; it also includes a drive assembly and a push assembly disposed on the housing 1. The drive assembly includes a first sliding groove 101 formed on the outer wall of the housing 1, a sliding block 6 slidably mounted in the first sliding groove 101, a fixed plate fixed on the sliding block 6, a second motor 7 fixed on the fixed plate, a second transmission rod 8 rotatably mounted on the sliding block 6 and connected to the output shaft of the second motor 7, and the second transmission rod 8 fixedly connected to the second crushing roller 10. The push assembly includes a cylinder 9 fixed to the outer wall of the housing 1, a rotating sleeve rotatably mounted on the second transmission rod 8, and the rotating sleeve fixedly connected to the telescopic end of the cylinder 9.

[0026] In detail, initially, the sliding block 6 is located at the end of the stroke of the first groove 101 near the first crushing roller 5, that is, the distance between the first transmission rod 4 and the second transmission rod 8 is the smallest. In this state, the channel size formed between the first crushing roller 5 and the second crushing roller 10 is the smallest, and the particle size of the crushed material is also the smallest. When it is necessary to crush waste circuit boards, the distance between the first crushing roller 5 and the second crushing roller 10 can be adjusted according to the required particle size of the material. To this end, under the action of the cylinder 9, the second transmission rod 8 is pushed to move by rotating the sleeve, thereby driving the sliding block 6 to slide along the first groove 101, so that the distance between the second crushing roller 10 and the first crushing roller 5 changes. The sliding block 6 also drives the fixed plate to move, thereby driving the second motor 7 to move synchronously. When the distance between the first crushing roller 5 and the second crushing roller 10 reaches the required requirement, the cylinder 9 stops moving. The material to be crushed can be added into the shell 1 through the feed hopper 2. Under its own weight, the material falls into the wedge-shaped gap inlet formed between the first crushing roller 5 and the second crushing roller 10. At this time, the first motor 3 and the second motor 7 start synchronously and drive the first transmission rod 4 and the second transmission rod 8 to rotate in opposite directions at the same speed, thereby driving the first crushing roller 5 and the second crushing roller 10 to rotate in opposite directions. After the material falls into the gap between the two rollers, it is immediately subjected to the combined action of huge friction and meshing forces from the surfaces of the two rollers and is forcibly pulled into the gradually narrowing crushing chamber. In the crushing chamber, the material is subjected to strong extrusion and shear stress, and its internal structure is forcibly crushed and torn, and finally crushed into particles of the preset particle size. The crushed material particles are discharged from between the first crushing roller 5 and the second crushing roller 10 and are screened by the screen 18 and transferred to the subsequent top-blown smelting furnace for resource recovery.

[0027] Preferably, due to the adjustable gap between the first crushing roller 5 and the second crushing roller 10, the position of the second crushing roller 10 relative to the first crushing roller 5 can be precisely controlled by the cylinder 9, thereby realizing online and stepless adjustment of the target particle size of the final crushed product to adapt to different subsequent processing processes and production needs.

[0028] Please see Figures 1-6 The driven component includes a rotating rod 11 rotatably mounted inside the housing 1, a toothed belt 20 connected to the first transmission rod 4 sleeved on the rotating rod 11, and a cam 12 fixed on the rotating rod 11.

[0029] Please see Figures 3-6 , Figure 8 , Figure 9 The screening mechanism includes symmetrically arranged receiving rods 17 fixed inside the housing 1, which are fixedly connected to both ends of the screen 18; it also includes an elastic component and a follower component disposed on the housing 1 and connected to the screen 18. The elastic component includes a second sliding groove 102 formed on the outer wall of the housing 1, a movable block 13 slidably installed in the second sliding groove 102, and a spring 16 fixed in the second sliding groove 102. The two ends of the spring 16 abut against the movable block 13 and the side wall of the second sliding groove 102, respectively. The follower component includes a movable rod 14 fixed on the movable block 13, which is fixedly connected to the screen 18. A limit wheel 15 is fixed to the end of the movable rod 14, and the limit wheel 15 abuts against the cam 12.

[0030] Furthermore, the screen 18 can be replaced according to the crushed particle size to ensure effective screening of the material. The movable rod 14 is located at the center of the two receiving rods 17. A guide column is fixed on the movable block 13. Under the guidance of the guide column, the spring 16 can only undergo axial compression or release. In the initial state, the short shaft of the cam 12 is in contact with the limiting wheel 15. The movable block 13 is located at the end of the stroke of the second slide groove 102 near the rotating rod 11, that is, the distance between the movable block 13 and the other side of the second slide groove 102 is the largest. The elongation of the spring 16 in its natural state is greater than the maximum distance between the movable block 13 and the other side of the second slide groove 102. In this state, spring 16 is in a pre-compressed state and always provides a thrust to movable block 13 toward the direction of rotating rod 11. In this state, movable rod 14 and receiving rod 17 are on the same horizontal plane, and screen 18 is in a relaxed state and in a "W" shape. After the waste circuit board is crushed, it will fall onto screen 18. At this time, the first transmission rod 4 will drive rotating rod 11 to rotate synchronously through toothed belt 20, thereby driving cam 12 to rotate at a constant speed. As cam 12 rotates, its outer contour periodically acts on limiting wheel 15. When the long axis of cam 12 gradually rotates to contact limiting wheel 15, the long axis of cam 12 continuously pushes limiting wheel. The movement of rod 15 drives the movement of movable rod 14, causing movable block 13 to slide along the second slide groove 102 and move away from the rotating rod 11. During this movement, movable block 13 also compresses spring 16. Under the action of movable rod 14, the central area of ​​screen 18 is pulled, lifting the originally loose "W"-shaped screen 18 upwards and stretching it along the direction of movement of movable rod 14, instantly transforming it into a centrally convex, approximately "triangularly taut" state. In this way, the effective screening surface of screen 18 changes from a flat or loose state to a taut inclined surface with a certain angle, significantly increasing the effective contact area and contact strength between the material and the surface of screen 18. The angle makes it easier for crushed material particles to roll and shift on the inclined surface, greatly increasing the probability of fine particles passing through the screen, thereby significantly improving screening efficiency and accuracy, ensuring that materials that meet the particle size requirements can be separated quickly and thoroughly; and the inclined surface formed by the "triangular tension" structure naturally generates a material sliding tendency towards the edge of the screen 18. Larger particles and insufficiently crushed materials piled on the screen 18 are continuously and directionally guided to move towards the edge of the screen 18 under the action of their own gravity along the inclined surface component force, and driven by the shaking effect generated by the periodic tension and relaxation of the screen 18, and finally slide into the preset storage box 19.As cam 12 continues to rotate, its long shaft disengages from limit wheel 15. The compressed spring 16 then rapidly releases its stored elastic potential energy, pushing movable block 13, movable rod 14, and screen 18 to quickly reset. Screen 18 returns from a taut triangular state to a relaxed "W" shape. This reset process is accompanied by violent shaking of screen 18, further shaking off any fine particles that may be adhering to the mesh and cleaning the screen 18, effectively alleviating the problem of mesh adhesion and clogging.

[0031] Preferably, by controlling the periodic tensioning and relaxation of the screen 18, the unqualified materials can be automatically and continuously separated and collected, effectively preventing the accumulation and blockage of large particles in the center of the screen 18, ensuring the continuity and stability of the screening operation, and avoiding the problems of uneven material distribution on the screen surface, difficulty in fine particle passage, and easy material jamming in the screen holes that occur when screening materials such as waste circuit boards that are easy to accumulate and have flat particles, such as traditional single vibrating screens. This improves screening efficiency and quality.

[0032] A method for uniformly feeding double-roll crushing includes the following steps: Step 1: Adjust the distance between the first crushing roller 5 and the second crushing roller 10 according to the required particle size for crushing using the roller crushing mechanism; Step 2: The waste circuit board to be crushed is added into the housing 1 through the feed hopper 2. At the same time, the roller crushing mechanism is activated and drives the first crushing roller 5 and the second crushing roller 10 to rotate in opposite directions to crush the waste motor board. Step 3: The crushed circuit board falls onto the screen 18 for screening. Under the action of the roller crushing mechanism, the driven component moves, thereby driving the screening mechanism to control the screen 18 to perform reciprocating tensioning and relaxation actions. Step 4: After screening, the material is weighed by a weighing scale and then conveyed to a top-blown smelting furnace for resource recovery.

[0033] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A uniform feed roll crusher comprising: The shell and the feeding hopper fixed on the top of the shell and communicated with the shell; characterized in that, further comprising: a pair of roll crushing mechanism arranged on the shell, the pair of roll crushing mechanism is connected with the first crushing roller and the second crushing roller, the pair of roll crushing mechanism can adjust the distance between the second crushing roller and the first crushing roller, and drive the first crushing roller and the second crushing roller to perform reverse rotation action; the screening mechanism arranged in the shell, the screening mechanism is connected with the screen; the driven assembly arranged on the shell and connected with the pair of roll crushing mechanism and the screening mechanism, the driven assembly can perform tensioning and relaxing action on the screen through the screening mechanism when the pair of roll crushing mechanism moves.

2. A uniform feed roll crusher as claimed in claim 1, wherein, The pair of roll crushing mechanism comprises a first motor fixed on the outer wall of the shell, a first transmission rod connected with the output shaft of the first motor is rotatably installed in the shell, and the first transmission rod is fixedly connected with the first crushing roller; further comprising a driving assembly and a pushing assembly arranged on the shell.

3. A uniform feed roll crusher as claimed in claim 2, wherein, The driving assembly comprises a first sliding groove formed in the outer wall of the shell, a sliding block is slidably installed in the first sliding groove, a fixed plate is fixed on the sliding block, a second motor is fixed on the fixed plate, a second transmission rod connected with the output shaft of the second motor is rotatably installed on the sliding block, and the second transmission rod is fixedly connected with the second crushing roller.

4. A uniform feed roll crusher as claimed in claim 3, wherein, The pushing assembly comprises a gas cylinder fixed on the outer wall of the shell, a rotating sleeve is rotatably installed on the second transmission rod, and the rotating sleeve is fixedly connected with the telescopic end of the gas cylinder.

5. A uniform feed roll crusher as claimed in claim 2, wherein, The driven assembly comprises a rotating rod rotatably installed in the shell, a toothed belt connected with the first transmission rod is sleeved on the rotating rod, and a cam is fixed on the rotating rod.

6. A uniform feed roll crusher as claimed in claim 5, wherein, The screening mechanism comprises a bearing rod fixed in the shell and arranged symmetrically, and the bearing rod is fixedly connected with both ends of the screen; further comprising an elastic assembly and a follow-up assembly arranged on the shell and connected with the screen.

7. A uniform feed roll crusher as claimed in claim 6, wherein, The elastic assembly comprises a second sliding groove formed in the outer wall of the shell, a movable block is slidably installed in the second sliding groove, a spring is fixed in the second sliding groove, and both ends of the spring are respectively abutted with the movable block and the side wall of the second sliding groove.

8. A uniform feed roll crusher as claimed in claim 7, wherein, The follow-up assembly comprises a movable rod fixed on the movable block, the movable rod is fixedly connected with the screen, a limiting wheel is fixed on the end of the movable rod, and the limiting wheel is abutted with the cam.

9. A uniform feed roll crusher as claimed in claim 1, wherein, The shell is fixed with a storage box for bearing the un-screened materials.

10. A method of uniform downfeed roll crushing using a uniform downfeed roll crusher as claimed in any one of claims 1 to 9, characterised by, The method comprises the following steps: Step one: according to the required particle size of crushing, adjust the distance between the first crushing roller and the second crushing roller through the pair of roll crushing mechanism; Step two: add the waste circuit board to be crushed into the shell through the feeding hopper, at the same time, the pair of roll crushing mechanism is actuated, and the first crushing roller and the second crushing roller are driven to rotate reversely to perform crushing action on the waste circuit board. Step three: the broken circuit board falls on the screen to be screened, and under the action of the counter-roller crushing mechanism, the driven assembly is driven to move, so as to drive the screening mechanism to move, so as to control the screen to execute the reciprocating tensioning and relaxation action; Step four: after the screened material is measured by the metering scale, it is conveyed to the top-blown smelting furnace for resource treatment.

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