A rotary furnace comprising a metallurgical dust collection system

Abstract

The present application relates to rotary furnace technical field, and discloses a kind of rotary furnace containing metallurgical dust collection system, including rotary furnace body and the recovery part for collecting metallurgical dust, the rotary furnace body is connected with recovery part by the conveying pipe group being arranged in its discharge port, the recovery part includes rack, the rack is fixedly connected with separation cylinder in, the separation cylinder bottom is equipped with hopper;Wherein, separation cylinder is equipped with processing piece for breaking up large particle size agglomerate in, the processing piece includes support frame fixedly connected in separation cylinder bottom, and ring plate is rotatably connected in the support frame.The rotary furnace containing metallurgical dust collection system, can effectively solve the problem in prior art, rotary furnace is discharged dust is often mixed with a certain amount of large particle size agglomerate, this kind of large particle size agglomerate is because particle size is relatively large, settling velocity is fast, easy to form accumulation at separation cylinder dust outlet key flow passage, cause separation cylinder blockage, need to stop machine and implement artificial unblocking.

Description

Technical Field

[0001] This invention relates to the field of rotary kiln technology, and more specifically to a rotary kiln containing a metallurgical dust collection system. Background Technology

[0002] As a core piece of equipment undertaking key processes such as roasting, smelting, and reduction, the rotary kiln generates a large amount of dust-laden flue gas during operation. This flue gas carries metallurgical dust containing not only valuable metals such as iron, zinc, and lead, but also impurities such as furnace charge debris and unreacted mineral particles. If this dust is not efficiently captured, it will not only lead to the loss of valuable resources but also cause serious environmental pollution problems.

[0003] In existing technologies, the collection system for metallurgical dust from rotary kilns mostly uses cyclone dust collectors as the core equipment. The working mechanism is as follows: the dust-laden airflow discharged from the rotary kiln enters the separation cylinder of the cyclone dust collector tangentially through the air inlet pipe, forming a high-speed rotating airflow field inside the separation cylinder. Under the action of centrifugal inertial force generated by the rotating airflow, the metallurgical dust particles overcome the viscous resistance of the airflow and migrate towards the wall of the separation cylinder. After colliding with the wall, they lose kinetic energy, slide down the wall, and settle into the bottom ash hopper, achieving the initial separation of dust and airflow. The purified airflow then flows upward along the central area of ​​the separation cylinder and is discharged through the central exhaust pipe.

[0004] However, the separation cylinder often adopts a funnel-shaped structure. Since the dust discharged from the rotary kiln often contains a certain amount of large-diameter agglomerates (such as soluble salts contained in metallurgical dust, which agglomerate after absorbing water and adhering to the dust), these large-diameter agglomerates are prone to accumulate at the key flow channels of the ash discharge port of the separation cylinder due to their large particle size and fast settling rate, causing blockage of the separation cylinder and requiring shutdown for manual unblocking. Summary of the Invention

[0005] To address the aforementioned shortcomings of existing technologies, this invention provides a rotary kiln containing a metallurgical dust collection system. This effectively solves the problem that in existing technologies, the dust discharged from rotary kilns often contains a certain amount of large-diameter agglomerates. These large-diameter agglomerates, due to their large size and fast settling rate, easily accumulate at the key flow channels of the ash discharge port of the separation cylinder, causing blockage of the separation cylinder and requiring manual unblocking after shutdown.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] The present invention provides a rotary kiln containing a metallurgical dust collection system, comprising a rotary kiln body and a recovery section for collecting metallurgical dust. The rotary kiln body is connected to the recovery section via a conveying pipe assembly disposed at its discharge port. The recovery section includes a frame, a separation cylinder is fixedly connected inside the frame, and an ash hopper is assembled at the bottom of the separation cylinder.

[0008] The separation cylinder is equipped with a processing component for crushing large-diameter agglomerates. The processing component includes a support frame fixedly connected to the bottom of the separation cylinder, and a ring plate is rotatably connected inside the support frame. The ring plate is slidably connected to a crushing plate through a shaft set at its top. A return spring is sleeved on the outer circumference of the shaft. A positive ratchet is fixedly connected to the bottom of the ring plate.

[0009] The bottom of the support frame is equipped with a rotary mechanism for driving the crushing plate to rotate along its central axis.

[0010] Furthermore, a ring block is fixedly connected to the inner wall of the separating cylinder, and the cross-section of the ring block is trapezoidal. The bottom of the ring block has a slot, and multiple slots are arranged in a circular array along the central axis of the ring block.

[0011] Furthermore, the crushing plate is tapered, and a shearing groove is provided on the outer side of the crushing plate. Multiple shearing grooves are arranged in a circular array along the central axis of the crushing plate. The shearing grooves and the groove openings are staggered. An abutment rod is fixedly connected to the inner wall of the crushing plate. Multiple abutment rods are arranged in a circular array along the central axis of the crushing plate.

[0012] Furthermore, an abutment plate is fixedly connected to the top of the support frame, and the top of the abutment plate is provided with an inclined surface that fits against the bottom of the abutment rod;

[0013] The support frame is slidably connected to a cleaning rod through slots provided inside it. There are multiple slots arranged in a circular array along the central axis of the support frame. The bottom of the cleaning rod is designed with an arc surface. The cleaning rod is connected to the outside of the support frame through a compression spring provided on its outer circumference.

[0014] Furthermore, the rotary mechanism includes a rotary shaft rotatably connected inside the support frame, and a drive motor for driving the rotary shaft to rotate along its central axis is fixedly connected to the bottom of the support frame.

[0015] Furthermore, a ring is fixedly connected to the outer circumference of the rotary shaft, and two rings are arranged in an array along the central axis of the rotary shaft. A positive pawl that meshes with a positive ratchet is provided on the outer side of the ring away from the drive motor. Two positive pawls are arranged symmetrically along the central axis of the ring. When the rotary shaft rotates in the positive direction, the positive pawls and the positive ratchet engage with each other.

[0016] A reverse pawl is fitted on the outer side of the ring near the drive motor, and the number of the reverse pawls corresponds one-to-one with the number of the forward pawls.

[0017] Furthermore, the support frame is rotatably connected to a rotating plate via an annular groove on its top. A reverse ratchet that meshes with a reverse pawl is fixedly connected inside the rotating plate. The top of the rotating plate has an inclined surface that fits against the arc surface of the cleaning rod. When the rotating shaft rotates in the reverse direction, the reverse pawl and the reverse ratchet engage with each other.

[0018] The technical solution provided by this invention has the following advantages compared with the prior art:

[0019] This invention features a processing component designed to actively break up large agglomerates formed by the hygroscopic adhesion of soluble salts in metallurgical dust. The crushing plate, located within a separation cylinder, has a conical design with a circular array of shear grooves, offset from the grooves of the annular blocks on the inner wall of the separation cylinder. The crushing plate combines rotary motion with axial reciprocating movement. Axial feeding is achieved through the engagement of the abutment rod and the inclined surface of the abutment plate, reducing the crushing chamber volume and creating a squeezing effect. Simultaneously, during rotation, the shear grooves and the grooves of the annular blocks form a shearing surface, achieving a dual effect of "compression crushing + shear crushing" on the agglomerates. After entering the crushing chamber enclosed by the crushing plate and the annular blocks, the agglomerates are broken into smaller particles by this combined squeezing and shearing action, preventing accumulation in the critical flow channel of the ash discharge port. Furthermore, the rotary mechanism rotates in the opposite direction, driving the rotary plate to rotate synchronously. The inclined surface of the rotary plate contacts the arc surface of the bottom of the cleaning rod. During the rotation of the rotary plate, the pressure from the inclined surface drives the cleaning rod to move axially and compress the spring. After disengagement, the spring returns to its original position, causing the cleaning rod to intermittently strike the inner wall of the crushing plate. Vibration energy is transferred to the shearing groove area, overcoming the static friction between particles and the adhesion of the groove wall, thus achieving online cleaning of deposits in the shearing groove. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0021] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention;

[0022] Figure 2 This is a cross-sectional view of the separation cylinder according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the three-dimensional separation structure of the separation cylinder, ring block, and processing component according to an embodiment of the present invention;

[0024] Figure 4 This is an embodiment of the present invention. Figure 3 A magnified structural diagram of part A in the middle;

[0025] Figure 5 This is a schematic diagram of the three-dimensional separation structure of the recovery section in an embodiment of the present invention;

[0026] Figure 6 This is a three-dimensional separation structure diagram of the support frame and cleaning rod according to an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the three-dimensional separation structure of the rotary mechanism according to an embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the three-dimensional state transformation structure of the rotating plate according to an embodiment of the present invention.

[0029] The labels in the diagram represent: 1. Rotary furnace body; 2. Recycling section; 21. Frame; 22. Separation cylinder; 221. Ring block; 2211. Groove; 23. Ash hopper; 24. Processing component; 241. Support frame; 2411. Abutment plate; 2412. Cleaning rod; 242. Ring plate; 2421. Forward ratchet; 243. Shaft; 244. Crushing plate; 2441. Abutment rod; 2442. Shearing groove; 245. Rotary mechanism; 2451. Rotary shaft; 2452. Ring sleeve; 2453. Forward pawl; 2454. Reverse pawl; 2455. Rotary plate; 2456. Reverse ratchet. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] The present invention will be further described below with reference to embodiments.

[0032] Example:

[0033] Please see Figures 1-8 The present invention provides a technical solution: a rotary kiln containing a metallurgical dust collection system, including a rotary kiln body 1 and a recovery section 2 for collecting metallurgical dust. The rotary kiln body 1 is connected to the recovery section 2 through a conveying pipe assembly set at its discharge port. The recovery section 2 includes a frame 21, a separation cylinder 22 is fixedly connected inside the frame 21, and an ash hopper 23 is assembled at the bottom of the separation cylinder 22.

[0034] The separation cylinder 22 is equipped with a processing component 24 for crushing large-diameter agglomerates. The processing component 24 includes a support frame 241 fixedly connected to the bottom of the separation cylinder 22, and a ring plate 242 is rotatably connected inside the support frame 241. The ring plate 242 is slidably connected to a crushing plate 244 through a shaft 243 set at its top. A return spring is sleeved on the outer circumference of the shaft 243. A positive ratchet 2421 is fixedly connected to the bottom of the ring plate 242.

[0035] The bottom of the support frame 241 is provided with a rotary mechanism 245 for driving the crushing plate 244 to rotate along its central axis.

[0036] A ring block 221 is fixedly connected to the inner wall of the separation cylinder 22, and the cross-section of the ring block 221 is trapezoidal. The bottom of the ring block 221 has a slot 2211, and multiple slots 2211 are arranged in a circular array along the central axis of the ring block 221.

[0037] The crushing plate 244 is tapered, and a shearing groove 2442 is provided on the outer side of the crushing plate 244. Multiple shearing grooves 2442 are provided and distributed in a circular array along the central axis of the crushing plate 244. The shearing grooves 2442 and the groove opening 2211 are staggered. An abutment rod 2441 is fixedly connected to the inner wall of the crushing plate 244. Multiple abutment rods 2441 are provided and distributed in a circular array along the central axis of the crushing plate 244.

[0038] The top of the support frame 241 is fixedly connected to an abutment plate 2411, and the top of the abutment plate 2411 is provided with an inclined surface that fits against the bottom of the abutment rod 2441.

[0039] The support frame 241 is slidably connected to the cleaning rod 2412 through slots provided inside it. Multiple slots are provided and distributed in a circumferential array along the central axis of the support frame 241. The bottom of the cleaning rod 2412 is designed with an arc surface. The cleaning rod 2412 is connected to the outside of the support frame 241 through a compression spring provided on its circumferential outer surface.

[0040] The rotary mechanism 245 includes a rotary shaft 2451 rotatably connected inside the support frame 241, and a drive motor for driving the rotary shaft 2451 to rotate along its central axis is fixedly connected to the bottom of the support frame 241.

[0041] A ring 2452 is fixedly connected to the outer circumference of the rotating shaft 2451. There are two rings 2452 arranged in an array along the central axis of the rotating shaft 2451. The outer side of the ring 2452 away from the drive motor is provided with a forward pawl 2453 that meshes with the forward ratchet 2421. There are two forward pawls 2453 arranged symmetrically along the central axis of the ring 2452. When the rotating shaft 2451 rotates in the forward direction, the forward pawls 2453 and the forward ratchet 2421 engage with each other.

[0042] A reverse pawl 2454 is fitted on the outer side of the ring 2452 near the drive motor, and the number of the reverse pawls 2454 corresponds one-to-one with the number of the forward pawls 2453.

[0043] The support frame 241 is rotatably connected to a rotating plate 2455 via an annular groove on its top. A reverse ratchet 2456 that meshes with a reverse pawl 2454 is fixedly connected inside the rotating plate 2455. The top of the rotating plate 2455 has an inclined surface that fits against the arc surface of the cleaning rod 2412. When the rotating shaft 2451 rotates in the reverse direction, the reverse pawl 2454 and the reverse ratchet 2456 engage with each other.

[0044] The working principle and advantages of the rotary kiln containing a metallurgical dust collection system:

[0045] In actual use, the dust-laden gas flow discharged from the rotary kiln body 1 is introduced into the separation cylinder 22 through the conveying pipe assembly, creating a high-speed rotating flow field inside the separation cylinder 22. Under the centrifugal inertial force generated by the rotating flow field, the metallurgical dust particles overcome the viscous resistance of the airflow and migrate towards the inner wall of the separation cylinder 22. After colliding with the wall, their kinetic energy is dissipated, and they slide down the wall to the bottom ash hopper 23, achieving preliminary separation of the gas and solid phases. During this process, soluble salts (such as chlorides and sulfates) contained in the metallurgical dust adhere to the dust particles after absorbing moisture or solidifying at low temperatures, forming large-diameter agglomerates. Due to their large particle size and fast settling rate, these agglomerates easily accumulate in the key flow channel area of ​​the ash discharge port of the separation cylinder 22, leading to blockage and failure of the ash discharge port.

[0046] In this invention, when large-diameter agglomerates form inside the separation cylinder 22, the agglomerates slide down the conical surface of the crushing plate 244 until they enter the crushing chamber formed by the conical surface of the crushing plate 244 and the conical surface of the inner ring block 221 of the separation cylinder 22. The operator controls the drive motor in the rotary mechanism 245 to drive the rotary shaft 2451 connected to its output end to rotate in a forward uniform speed.

[0047] During this process, the upper ring 2452 of the rotary shaft 2451 has a built-in forward pawl 2453, which forms a one-way transmission pair with the forward ratchet 2421 at the bottom of the ring plate 242. When the rotary shaft 2451 rotates forward around its central axis, the forward pawl 2453 engages with the forward ratchet 2421, driving the ring plate 242 to rotate synchronously with the rotary shaft 2451. Meanwhile, the reverse pawl 2454 installed on the lower ring 2452 of the rotary shaft 2451 is disengaged from the reverse ratchet 2456 built into the rotary plate 2455, and the rotary plate 2455 does not move synchronously with the rotary shaft 2451.

[0048] The shaft 243 and the crushing plate 244 are connected by a keyway, allowing the crushing plate 244 to rotate axially along the keyway while rotating synchronously with the shaft 243. During the process of the ring plate 242 and shaft 243 driving the crushing plate 244 to rotate uniformly around its central axis, the abutment rod 2441 built into the crushing plate 244 gradually contacts the abutment plate 2411 on the support frame 241. Initially, the bottom spherical surface of the abutment rod 2441 contacts the lower end of the inclined surface of the abutment plate 2411. As the crushing plate 244 continues to rotate, the abutment rod 2441 slides from the lower end to the higher end along the inclined surface of the abutment plate 2411. The height difference of the inclined surface drives the crushing plate 244 to axially feed towards the ring block 221 along its central axis, forcing the volume of the crushing chamber to shrink and creating a crushing effect on the lumps in the chamber. When the abutment rod 2441 disengages from the higher end of the abutment plate 2411, the return spring on the shaft 243 drives the crushing plate 244 to axially return to the initial position. Through the above reciprocating motion, the lumps are continuously crushed. After crushing, the lumps that meet the requirements will enter the ash hopper 23 through the channel formed by the lower side of the crushing plate 244 and the inner wall of the separation cylinder 22 for centralized collection. The lumps that cannot pass through the channel will continue to be in the crushing chamber formed by the crushing plate 244 and the ring block 221 until they meet the requirements.

[0049] The crushing plate 244 adopts a conical structure, and its conical surface is adapted to the streamline of the rotating flow field of the separation cylinder 22. This ensures that it does not interfere with the centrifugal separation motion of the dust-laden airflow and guides the agglomerates to slide down the conical surface into the crushing chamber. The conical structure also increases the contact area with the agglomerates, improving the agglomerate capture efficiency and achieving synergistic compatibility between the crushing function and the gas-solid separation function. Furthermore, the crushing plate 244 is slidably connected to the ring plate 242 via a shaft 243, and a return spring is sleeved on the shaft 243. When the crushing plate 244 rotates, the abutment rod 2441 slides from a low position to a high position along the inclined surface of the abutment plate 2411, driving the crushing plate 244 to feed axially and causing the crushing chamber volume to adaptively decrease. After the abutment rod 2441 disengages, the return spring drives the crushing plate 244 to return to its original position, forming a reciprocating volume adjustment that can adapt to the crushing requirements of agglomerates of different particle sizes.

[0050] During the crushing of large-diameter agglomerates, the crushing plate 244 maintains a forward rotational motion, and the shearing groove 2442 on the outer conical surface of the crushing plate 244 is staggered with the bottom slot 2211 of the ring block 221. Under the combined motion of the crushing plate 244 rotating around the central axis and reciprocating axially, the crushing plate 244 has a combined motion mode of "forward rotational motion + axial reciprocating motion". Combined with the staggered design of the shearing groove 2442 and the slot 2211 of the ring block 221, it achieves the dual function of "compression crushing + shear crushing", crushing large-diameter agglomerates (large particle size, fast settling) into small-diameter particles and eliminating the accumulation risk in the key flow channel of the ash discharge port.

[0051] In the crushing of large-diameter agglomerates, the shearing action between the crushing plate 244 and the ring block 221 generates fine dust and incompletely crushed secondary particles. These substances are easily retained and deposited due to the groove structure of the shear groove 2442. After the deposits fill the effective space of the groove, the shear contact area will be reduced, directly reducing the shearing and crushing efficiency for large-diameter agglomerates, resulting in the crushed product having an excessive particle size. Furthermore, the accumulated hard impurities (such as uncrushed metal oxide particles) will generate severe friction with the groove wall and ring block 221 during the movement of the crushing plate 244, accelerating the wear and failure of the edge of the shear groove 2442.

[0052] In this invention, the operator controls the drive motor of the rotary mechanism 245 to drive the rotary shaft 2451 to rotate in the opposite direction around its central axis. At this time, the forward pawl 2453 is disengaged from the forward ratchet 2421 at the bottom of the ring plate 242, and the reverse pawl 2454 engages with the reverse ratchet 2456 built into the rotary plate 2455, thereby achieving motion decoupling. The ring plate 242, shaft 243 and crushing plate 244 do not rotate synchronously with the rotary shaft 2451, only the rotary plate 2455 and the rotary shaft 2451 maintain synchronous rotation.

[0053] During the rotation of the rotary plate 2455, its inclined structure gradually comes into contact with the bottom arc surface of the cleaning rod 2412: in the initial contact stage, the cleaning rod 2412 is at the lower end of the inclined surface of the rotary plate 2455; as the rotary plate 2455 continues to rotate, the contact pressure between the cleaning rod 2412 and the inclined surface gradually increases, driving the cleaning rod 2412 to make axial displacement along its own central axis, and the compression spring sleeved on the outer periphery of the cleaning rod 2412 undergoes elastic compression. When the end of the cleaning rod 2412 contacts the inner wall of the crushing plate 244, an impact load is applied to the inner wall of the crushing plate 244; after the rotary plate 2455 and the cleaning rod 2412 disengage, the cleaning rod 2412 is released from constraint, and the compression spring releases elastic potential energy to drive the cleaning rod 2412 to return to its initial position.

[0054] Multiple sets of cleaning rods 2412 on the support frame 241 intermittently strike the inner wall of the crushing plate 244 through the aforementioned cycle. The resulting instantaneous impact vibration is transmitted through the crushing plate 244 to the shearing groove 2442 area. For fine particulate impurities and uncrushed secondary particles deposited in the shearing groove 2442, the vibration energy can overcome the static friction between particles and the adhesion between particles and the groove wall, causing the impurities to detach from the groove wall under the action of vibration inertia. They are then carried by airflow or settle into the ash discharge channel by their own gravity, ultimately achieving online cleaning of the shearing groove 2442, ensuring the continuity of crushing operations and the stability of crushing effect.

[0055] The present invention employs processing component 24, which has the following advantages:

[0056] Advantage 1: For large particle agglomerates formed by the hygroscopic adhesion of soluble salts in metallurgical dust, active crushing is achieved through the processing component 24 within the separation cylinder 22. The crushing plate 244 is conical in design and features a circumferential array of shear grooves 2442, which are staggered with the grooves 2211 of the annular block 221 on the inner wall of the separation cylinder 22. The crushing plate 244 has both rotational motion and axial reciprocating motion. Axial feeding is achieved through the engagement of the abutment rod 2441 with the inclined surface of the abutment plate 2411, reducing the volume of the crushing chamber and creating a squeezing effect. Simultaneously, during rotation, the shear grooves 2442 and the grooves 2211 of the annular block 221 form a shearing surface, achieving a dual effect of "compression crushing + shear crushing" on the agglomerates. After the agglomerates enter the crushing chamber enclosed by the crushing plate 244 and the annular block 221, they are crushed into small-diameter particles by the dual action of compression and shearing, preventing accumulation in the critical flow channel of the ash discharge port.

[0057] Secondly, the rotary mechanism 245 rotates in the opposite direction, and when the rotary shaft 2451 rotates in the opposite direction, it drives the rotary plate 2455 to rotate synchronously. The top inclined surface of the rotary plate 2455 is in contact with the bottom arc surface of the cleaning rod 2412. During the rotation of the rotary plate 2455, the pressure of the inclined surface drives the cleaning rod 2412 to move axially and compress the spring. After disengagement, the spring returns to its original position, causing the cleaning rod 2412 to intermittently strike the inner wall of the crushing plate 244. The vibration energy is transferred to the shearing groove 2442 area, overcoming the static friction between particles and the adhesion of the groove wall, thus realizing the online cleaning of the deposits in the shearing groove 2442.

[0058] Thirdly, the rotary mechanism 245 is equipped with a forward pawl 2453 and a reverse pawl 2454 respectively via a double-ring sleeve 2452 on the rotary shaft 2451. These engage with the forward ratchet 2421 and the reverse ratchet 2456 respectively. When the rotary shaft 2451 rotates forward, only the forward pawl 2453 and the forward ratchet 2421 engage, driving the crushing plate 244 to perform the crushing action. When rotating in the reverse direction, only the reverse pawl 2454 and the reverse ratchet 2456 engage, driving the cleaning rod 2412 to perform the unblocking action. The forward pawl 2453 and the forward ratchet 2421, and the reverse pawl 2454 and the reverse ratchet 2456 each constitute an independent unidirectional transmission system. During the forward and reverse rotation of the rotary shaft 2451, the two sets of transmission pairs alternately engage and disengage, ensuring that the crushing motion of the crushing plate 244 and the unblocking motion of the cleaning rod 2412 do not interfere with each other.

[0059] Fourthly, the lower side of the crushing plate 244 and the inner wall of the separation cylinder 22 form a sizing and screening channel. The geometry of this channel matches the particle size control threshold of the target dust. After crushing, dust particles that meet the standard particle size can fall directly into the ash hopper 23 below through the sizing and screening channel for collection. Large particles that do not meet the particle size requirements remain in the crushing chamber and continue to be crushed by the crushing components until their particle size meets the passage conditions of the sizing and screening channel, thus achieving closed-loop control of "crushing-screening-re-crushing". Furthermore, the top and bottom of the ring block 221 form a matching distribution... The conical surface of the inner cavity of the cylinder 22 and the bottom conical surface of the ring block 221 precisely enclose the conical outer surface of the crushing plate 244 to form a closed crushing chamber for crushing agglomerates. This provides a stable working space for compression and shear crushing. The top conical surface of the ring block 221 has gravity guiding characteristics, which can guide large-diameter agglomerates to slide down the conical surface into the crushing chamber. This effectively avoids the formation of agglomerates on the top surface of the ring block 221, prevents blind spots in the crushing function caused by agglomerate retention, ensures the effective action of crushing operation on all large-diameter agglomerates, and improves the comprehensiveness and continuity of crushing operation.

[0060] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rotary furnace having a metallurgical dust collecting system, comprising a rotary furnace body (1) and a recovery section (2) for collecting metallurgical dust, the rotary furnace body (1) being connected to the recovery section (2) by a delivery pipe group provided at the discharge port thereof, characterized in that, The recovery part (2) comprises a rack (21), a separation cylinder (22) is fixedly connected in the rack (21), and a hopper (23) is assembled at the bottom of the separation cylinder (22); The separation cylinder (22) is provided with a processing piece (24) for crushing large-particle-size clumps, the processing piece (24) comprises a support frame (241) fixedly connected at the bottom of the separation cylinder (22), a ring plate (242) is rotatably connected in the support frame (241), a crushing plate (244) is slidably connected to the ring plate (242) through a shaft rod (243) arranged at the top of the ring plate (242), a return spring is arranged on the circumferential outer surface of the shaft rod (243), and a forward ratchet (2421) is fixedly connected to the bottom of the ring plate (242); The bottom of the support frame (241) is provided with a rotary mechanism (245) for driving the crushing plate (244) to rotate along the central axis thereof; The inner wall of the separation cylinder (22) is fixedly connected with a ring block (221), the cross section of the ring block (221) is designed in a trapezoidal shape, a notch (2211) is formed in the bottom of the ring block (221), a plurality of the notches (2211) are arranged in a circumferential array along the central axis of the ring block (221), the crushing plate (244) is designed in a conical shape, a shearing groove (2442) is formed in the outer side of the crushing plate (244), a plurality of the shearing grooves (2442) are arranged in a circumferential array along the central axis of the crushing plate (244), the shearing grooves (2442) are arranged in a staggered manner with the notches (2211), an abutting rod (2441) is fixedly connected to the inner wall of the crushing plate (244), and a plurality of the abutting rods (2441) are arranged in a circumferential array along the central axis of the crushing plate (244); The top of the support frame (241) is fixedly connected with an abutting plate (2411), and the top of the abutting plate (2411) is provided with an inclined surface matched with the bottom of the abutting rod (2441); The support frame (241) is slidably connected with a cleaning rod (2412) through a slot hole arranged in the support frame (241), a plurality of the slot holes are arranged in a circumferential array along the central axis of the support frame (241), the bottom of the cleaning rod (2412) is designed in an arc shape, and the cleaning rod (2412) is connected to the outer side of the support frame (241) through a compression spring arranged on the circumferential outer surface thereof.

2. A rotary furnace incorporating a metallurgical dust collection system according to claim 1, characterized in that: The rotary mechanism (245) comprises a rotary shaft (2451) rotatably connected in the support frame (241), and the bottom of the support frame (241) is fixedly connected with a driving motor for driving the rotary shaft (2451) to rotate along the central axis thereof.

3. A rotary furnace incorporating a metallurgical dust collection system according to claim 2, characterised in that: The circumferential outer surface of the rotating shaft (2451) is fixedly connected with a ring sleeve (2452), and the ring sleeve (2452) is provided with two ring sleeves which are arrayed along the central axis of the rotating shaft (2451) and away from the driving motor. The outer side of the ring sleeve (2452) is provided with a forward ratchet pawl (2453) which is engaged with the forward ratchet wheel (2421). The forward ratchet pawl (2453) is provided with two forward ratchet pawls which are symmetrically distributed along the central axis of the ring sleeve (2452). When the rotating shaft (2451) rotates forward, the forward ratchet pawl (2453) is engaged with the forward ratchet wheel (2421). The outer side of the ring sleeve (2452) close to the driving motor is provided with a reverse ratchet pawl (2454), and the number of the reverse ratchet pawl (2454) corresponds to the number of the forward ratchet pawl (2453).

4. A rotary furnace incorporating a metallurgical dust collection system according to claim 3, characterized in that: The support frame (241) is rotatably connected with a rotating plate (2455) through the ring groove opened on the top of the support frame (241). The rotating plate (2455) is fixedly connected with a reverse ratchet wheel (2456) which is engaged with the reverse ratchet pawl (2454). The top of the rotating plate (2455) is provided with an inclined surface which is fitted with the curved surface of the cleaning rod (2412). When the rotating shaft (2451) rotates reversely, the reverse ratchet pawl (2454) is engaged with the reverse ratchet wheel (2456).

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