A rotary reduction furnace feeding auxiliary device

Abstract

This utility model provides a rotary reduction furnace feeding auxiliary device, relating to the field of metal smelting technology, and applied to a rotary reduction furnace. The rotary reduction furnace includes a screw feeder, and the rotary reduction furnace feeding auxiliary device includes an inverted conical hopper, a temporary storage box, a discharge assembly, and a spreading assembly. The hopper's inlet is located directly below the screw feeder's outlet. The temporary storage box has a rectangular holding cavity with a top opening. The discharge assembly is located at the outlet at the bottom of the temporary storage box and has a supporting plane that matches the shape of the rectangular holding cavity. The four sets of straight-edge areas of the supporting plane are used to evenly receive the material discharged from the hopper's outlet. The supporting plane has an array of discharge holes that can be opened and closed synchronously. The spreading assembly has a pushing part that circulates along the circumference of the rectangular holding cavity to evenly spread the accumulated material across the supporting plane. This utility model improves the feeding uniformity of the rotary reduction furnace by allowing the material to enter the furnace in a continuous flow and uniformly.

Description

Technical Field

[0001] This utility model relates to the field of metal smelting technology, and in particular to a rotary reduction furnace feeding auxiliary device. Background Technology

[0002] A rotary reduction furnace is a core piece of equipment that achieves dynamic mixing and gas-solid reduction reaction of materials through furnace rotation. Its main body is an inclined cylindrical structure that rotates slowly at a certain speed under the drive of a drive device, so that the material continuously tumbles in a high-temperature reducing atmosphere (such as hydrogen). Through segmented temperature control and countercurrent gas-solid contact, this equipment can efficiently complete the reduction process of metal oxides (such as tungsten oxide) to generate high-purity metal powder (such as tungsten powder), which is widely used in cemented carbide, new energy materials and other fields.

[0003] Currently, rotary reduction furnaces commonly use screw feeders as the feeding device. This device consists of a drive motor, a screw shaft, and a trough. The rotating screw blades propel the powder material from the inlet to the feed end of the rotary furnace. Some improved designs add a variable frequency motor to adjust the speed, or adopt a double screw structure to enhance the continuity of feeding. This type of device relies on the mechanical extrusion of the screw blades to achieve material conveying. It has a simple structure and is easy to seal, making it the mainstream configuration in the industry.

[0004] Although screw feeders are widely used, they still have the defect of poor uniformity of output during the feeding process of rotary reduction furnaces. Specifically, the rotating screw blades generate pulsating thrust, causing the material to enter the furnace in a "pulsating" rather than continuous flow form. In the reduction of tungsten powder, uneven feeding will cause local accumulation or sparseness of material in the furnace, leading to an imbalance in the distribution of the reduction temperature field, resulting in inconsistent redox reaction kinetics, and the final product will be a mixture of coarse crystals and unreduced oxides. Utility Model Content

[0005] Based on this, the purpose of this utility model is to provide a feeding auxiliary device for a rotary reduction furnace, which aims to make the material enter the furnace in a continuous flow form and uniformly improve the feeding uniformity of the rotary reduction furnace.

[0006] To achieve the above objectives, this utility model proposes a rotary reduction furnace feeding auxiliary device, which is applied in a rotary reduction furnace. The rotary reduction furnace includes a screw feeder, and the rotary reduction furnace feeding auxiliary device includes an inverted conical hopper, a temporary storage box, a discharge assembly, and a spreading assembly. The feed inlet of the hopper is located directly below the discharge outlet of the screw feeder. The temporary storage box has a rectangular holding cavity with an open top. The discharge assembly is located at the discharge outlet at the bottom of the temporary storage box. The discharge assembly has a supporting plane that matches the shape of the rectangular holding cavity. The four sets of straight edge areas of the supporting plane are used to evenly support the material discharged from the discharge outlet of the hopper. The supporting plane has an array of discharge holes that can be opened and closed synchronously. The spreading assembly has a pushing part that moves circumferentially along the rectangular holding cavity to evenly spread the accumulated material across the supporting plane.

[0007] In addition, the rotary reduction furnace feeding auxiliary device described above according to this utility model may also have the following additional technical features: Furthermore, the tiling assembly includes a vertically lifting suspension frame, an auxiliary connecting block, a rectangular pusher tooth, a transmission frame, a rotating rod, and a first driver. The auxiliary connecting block is slidably disposed on the suspension frame and moves along a first horizontal direction, which is parallel to a right-angle side of the rectangular receiving cavity. The rectangular pusher tooth is slidably disposed on the auxiliary connecting block and moves along a second horizontal direction. The transmission frame is connected to the rectangular pusher tooth. The center of the rotating rod is rotatably connected to the suspension frame, and one end of the rotating rod is rotatably connected to the center of the transmission frame. The first driver is drively connected to the center of the rotating rod to drive the rotating rod to rotate. The second horizontal direction is perpendicular to the first horizontal direction.

[0008] Furthermore, the transmission frame includes a span beam and two sets of L-shaped vertical side beams. The center of the span beam is rotatably connected to one end of the rotating rod. The extension direction of the span beam is parallel to the first horizontal direction. One end of each set of L-shaped vertical side beams is connected to both ends of the span beam, and the other ends of the two sets of L-shaped vertical side beams are arranged opposite each other to connect the rectangular push teeth.

[0009] Furthermore, the feeding assembly includes a feeding orifice plate, a cloth bag, and a circumferential shrinking and expanding mechanism. The feeding orifice plate is located at the discharge port at the bottom of the temporary storage box. The cloth bag is fitted onto the feeding orifice plate. The circumferential shrinking and expanding mechanism is located on the temporary storage box and on the side opposite to the rectangular storage cavity. The circumferential shrinking and expanding mechanism is used to adjust the opening size of the cloth bag.

[0010] Furthermore, the circumferential shrinking and expanding mechanism includes an outer ring, an inner ring, a pushing member, and a second driver. The inner ring is located in the central hollow area of ​​the outer ring and is coaxially arranged with the outer ring. The cloth bag passes through the inner arm of the inner ring. The pushing member is movably inserted through the outer ring and the inner ring. Multiple sets of pushing members are provided, and the multiple sets of pushing members are spaced apart along the circumference of the outer ring. The second driver is connected to the pushing member through a transmission assembly to drive the pushing member to move radially parallel to the outer ring.

[0011] Furthermore, the transmission assembly includes a ring tooth and a straight rack. The ring tooth is disposed in the hollow area between the outer ring and the inner ring and is coaxially arranged with the outer ring. The ring tooth is slidably disposed on the inner wall of the outer ring. The straight rack is disposed on the pusher and is connected to the ring tooth in a transmission manner.

[0012] Furthermore, an intermediate gear is rotatably mounted on the outer ring, and the upper and lower ends of the intermediate gear are respectively meshed with the ring teeth and the straight rack.

[0013] Furthermore, the pusher is a straight slider, and a surrounding plate is provided at one end of the straight slider near the inner ring. After the straight slider moves into place towards the inner ring, the surrounding plates close together to close the opening of the bag.

[0014] The beneficial effects of this utility model include at least the following: by setting an inverted conical hopper to receive the pulsed discharge of the screw feeder, and by utilizing the cyclical motion of the spreading component to push the material, i.e. through a multi-directional linkage mechanism composed of a suspension frame, a rotating rod, and a transmission frame, the rectangular pusher teeth are driven to circumferentially circulate along the rectangular receiving cavity, forcibly breaking up material agglomerates and uniformly covering the entire supporting plane. Combined with the synchronous opening and closing function of the array-type discharge holes, it can ensure that the material falls uniformly from multiple points at a constant flow rate, avoiding local accumulation or sparseness, eliminating the influence of the pulsating thrust generated by the rotation of the screw blades, and transforming the material from a discrete "pulse flow" into a continuous and uniform "spread layer", thus ensuring the consistency of the distribution of the material entering the furnace. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the temporary storage box in one embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the tiling component in one embodiment of the present invention; Figure 3 This is a schematic diagram of the circumferential shrinking and expanding mechanism in one embodiment of the present invention; Explanation of key component symbols: 100 hopper, 200 temporary storage box, 310 discharge orifice plate, 330 circumferential shrinking and expanding mechanism, 331 outer ring, 332 inner ring, 333 pusher, 334 ring tooth, 335 straight rack, 336 intermediate gear, 400 flattening assembly, 410 suspension frame, 411 first guide rail, 420 auxiliary connecting block, 421 second guide rail, 430 rectangular pusher tooth, 431 rectangular base, 432 rake tooth, 440 transmission frame, 441 span beam, 442 L-shaped vertical side beam, 450 rotating rod; The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0016] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0017] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0019] Please refer to Figures 1 to 3 This utility model provides a feeding auxiliary device for a rotary reduction furnace, which is applied in the rotary reduction furnace. The rotary reduction furnace includes a screw feeder. The screw conveyor is mainly composed of a screw shaft, a trough, and a drive device. The lower half of the trough is semi-circular. The screw shaft is placed longitudinally in the trough. When the screw shaft rotates, the material does not rotate with the screw shaft due to its mass and the friction between it and the trough wall. In this way, the axial thrust generated by the rotation of the screw shaft directly acts on the material and becomes the driving force for the material to move, causing the material to slide axially until it is pushed to the discharge port of the screw feeder for discharge.

[0020] The rotary reduction furnace feeding auxiliary device includes an inverted cone-shaped hopper 100, a temporary storage box 200, a discharge assembly, and a spreading assembly 400. The hopper 100 can be square cone or conical. The inlet of the hopper 100 is located directly below the outlet of the screw feeder. Since the material discharged from the outlet of the screw feeder is relatively dispersed, it can converge and accumulate after passing through the inverted cone-shaped hopper 100. The temporary storage box 200 has a rectangular holding cavity with an open top. Optionally, the material can be transferred to the four straight-side areas of the rectangular holding cavity through a one-in-many-out pipe. However, it should be noted that the one-in-many-out pipes need to be of the same size and symmetrically positioned to ensure that the discharge volume of each outlet is relatively balanced.

[0021] The discharge assembly is located at the discharge port at the bottom of the temporary storage tank 200. The discharge assembly has a supporting plane that matches the cross-sectional shape of the rectangular holding cavity. In this way, the supporting plane and the rectangular holding cavity can form a storage space for the material discharged from the discharge port of the hopper 100. Specifically, the discharged material is supported in the center of the straight-edge area around the storage space. In addition, the supporting plane is arrayed with discharge holes that can be opened and closed synchronously. When material needs to be discharged, all discharge holes are opened simultaneously.

[0022] The spreading component 400 is equipped with a spreading section that circulates around the rectangular storage cavity. After one rotation, the spreading section can evenly spread the accumulated material across the supporting surface. It should be noted that, in order to spread the material evenly, the spreading section needs to be able to adjust its height according to the material height. For example, after one rotation, if the material height decreases and there is still accumulated material, the height of the spreading section can be lowered to further spread the material. In addition, during one rotation, the overall movement trajectory of the spreading section should cover the entire supporting surface. In this way, the material supported and discharged in the center of the straight edge area around the storage space can be gradually spread evenly within the storage space. When all the discharge holes open simultaneously, the material is discharged downwards evenly.

[0023] In some alternative embodiments, such as Figure 2 As shown, the tiling assembly 400 includes a vertically adjustable suspension frame 410, an auxiliary connecting block 420, a rectangular pusher 430, a transmission frame 440, a rotating rod 450, and a first driver (not shown in the figures). Specifically, the suspension frame 410 is height-adjustable according to the material height. The suspension frame 410 is provided with a first guide rail 411, and the auxiliary connecting block 420 is slidably mounted on the first guide rail 411. Figure 3 The movement is shown in the X direction (the X direction is parallel to one right-angle side of the rectangular receiving cavity). The auxiliary connecting block 420 is equipped with a second guide rail 421, and the rectangular pusher 430 is slidably mounted on the second guide rail 421. The rectangular pusher 430 moves along... Figure 3As shown, the movement is in the Y direction (the Y direction is perpendicular to the X direction). The transmission frame 440 is connected to the rectangular pusher 430, and the center of the rotating rod 450 is rotatably connected to the suspension frame 410. Thus, under external force, the rotating rod 450 can rotate on the suspension frame 410. One end of the rotating rod 450 is rotatably connected to the center of the transmission frame 440. The first driver is tractively connected to the center of the rotating rod 450. When the first driver is in operation, it drives the rotating rod 450 to rotate. Since the auxiliary connecting block 420 is slidably mounted on the first guide rail 411, and the rectangular pusher 430 is slidably mounted on the second guide rail 421, and the first guide rail 411 and the second guide rail 421 are perpendicular to each other, the rotating rod 450 can drive the center of the transmission frame 440 to circulate along a rectangular path, thereby driving the rectangular pusher 430 to circulate along the rectangular path. Optionally, the first driver can be a rotary motor, rotary cylinder, rotary hydraulic cylinder, or other power device.

[0024] In some alternative embodiments, such as Figure 2 As shown, the rectangular pusher 430 includes a rectangular base 431 and rake teeth 432. The rake teeth 432 are provided in multiple sets and are arranged in an array on the side of the rectangular base 431 facing the supporting plane.

[0025] In some alternative embodiments, such as Figure 2 As shown, the transmission frame 440 includes a span beam 441 and two sets of L-shaped vertical side beams 442. The center of the span beam 441 is rotatably connected to one end of the rotating rod 450, and the extension direction of the span beam 441 is parallel to the direction of rotation. Figure 3 In the X direction shown, the lower ends of the two sets of L-shaped vertical side beams 442 are vertically connected to the left and right ends of the span beam 441, respectively, and the upper ends of the two sets of L-shaped vertical side beams 442 are arranged opposite each other to connect the edge of the rectangular pusher 430.

[0026] In some alternative embodiments, such as Figure 1 , Figure 3 As shown, the feeding assembly includes a feeding orifice plate 310, a cloth bag (not shown in the figures), and a circumferential shrinking and expanding mechanism 330. Specifically, the feeding orifice plate 310 is located at the discharge port at the bottom of the temporary storage box 200, and the upper end surface of the feeding orifice plate 310 forms a supporting plane. The cloth bag is cylindrical with a through-hole in the middle and is located at the edge of the feeding orifice of the feeding orifice plate 310. The circumferential shrinking and expanding mechanism 330 is located on the temporary storage box 200 and is located on the side opposite to the rectangular storage cavity. In use, the circumferential shrinking and expanding mechanism 330 can adjust the opening size of the cloth bag.

[0027] In some alternative embodiments, such as Figure 3As shown, the circumferential shrinking and expanding mechanism 330 includes an outer ring 331, an inner ring 332, a pushing member 333, and a second driver (not shown in the figures). Specifically, the inner ring 332 is located in the central hollow area of ​​the outer ring 331 and is coaxially arranged with the outer ring 331. The cloth bag passes through the inner arm of the inner ring 332. The outer ring 331 and the inner ring 332 are provided with aligned sliding grooves. The pushing member 333 is a straight slider that slides through the sliding grooves on the outer ring 331 and the inner ring 332. Multiple sets of pushing members 333 are provided, and the multiple sets of pushing members 333 are spaced apart along the circumference of the outer ring 331. Preferably, the multiple sets of pushing members 333 are evenly spaced along the circumference of the outer ring 331. The second driver is connected to the pushing member 333 through a transmission assembly. When the second actuator is in operation, it pushes the pusher 333 to move radially parallel to the outer ring 331, for example, moving outward radially parallel to the outer ring 331. At this time, the pusher 333 gradually moves away from the bag, thereby gradually opening the bag's opening. Alternatively, it can move radially inward parallel to the outer ring 331, at which time the pusher 333 gradually moves closer to the bag, thereby gradually closing the bag's opening. Optionally, the second actuator can be a rotary motor, rotary cylinder, rotary hydraulic cylinder, or other power device, and a set of second actuators can simultaneously drive the pusher 333 to move.

[0028] In this embodiment, the size of the opening of the bag can be adjusted by the circumferential shrinking and expanding mechanism 330, thereby adjusting the effective discharge amount of the discharge hole of the discharge plate 310. Moreover, since all the circumferential shrinking and expanding mechanisms 330 operate synchronously, the material discharged from the discharge hole of the discharge plate 310 is uniform.

[0029] In some alternative embodiments, such as Figure 3 As shown, the transmission assembly includes a ring gear 334 and a straight rack 335. Specifically, the ring gear 334 is located in the hollow area between the outer ring 331 and the inner ring 332, and is coaxially arranged with the outer ring 331. The ring gear 334 is slidably disposed on the inner wall of the outer ring 331. The straight rack 335 is disposed on the pusher 333, and the straight rack 335 is drively connected to the ring gear 334. When the second driver is in the working state, the second driver drives the ring gear 334 to rotate in both directions, thereby driving the straight rack 335 to move radially inward and outward parallel to the outer ring 331.

[0030] In some alternative embodiments, such as Figure 3As shown, an intermediate gear 336 is rotatably mounted on the outer ring 331. The upper and lower ends of the intermediate gear 336 are respectively meshed with the ring gear 334 and the straight rack 335. When the second driver is in operation, the second driver drives the ring gear 334 to rotate in both directions, which in turn drives the intermediate gear 336 to rotate in both directions. The rotating intermediate gear 336 drives the straight rack 335 to move in and out radially parallel to the outer ring 331, which in turn pushes the pusher 333 to move in and out radially parallel to the outer ring 331, so that the inner end of the pusher 333 moves away from or closer to the cloth bag.

[0031] In some alternative embodiments, the pusher 333 has a retaining plate (not shown in the figures) at one end near the inner ring 332. When the straight slider moves into place towards the inner ring 332, the retaining plates close together to close the opening of the bag, keeping the bag tightly sealed and preventing material leakage.

[0032] In summary, this patent solves the uniformity problem caused by pulse feeding of screw feeders through a three-level synergistic mechanism formed by buffer homogenization (hopper), dynamic spreading (dispersion section), and synchronous feeding (discharge holes of the array and bag control), providing core assurance for the stability of high-temperature reduction reaction and product consistency.

[0033] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0034] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of protection of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the appended claims.

Claims

1. A feeding auxiliary device for a rotary reduction furnace, characterized in that, It is used in a rotary reduction furnace, the rotary reduction furnace including a screw feeder, and the rotary reduction furnace feeding auxiliary device including: An inverted cone-shaped hopper, wherein the hopper's inlet is located directly below the screw feeder's outlet; A temporary storage box, wherein the temporary storage box has a rectangular holding cavity with an opening at the top; A material discharge assembly is located at the discharge port at the bottom of the temporary storage box. The material discharge assembly has a supporting plane that matches the shape of the rectangular storage cavity. The four straight-edge areas of the supporting plane are used to evenly support the material discharged from the discharge port of the hopper. The supporting plane is provided with an array of discharge holes that can be opened and closed synchronously. The paving assembly includes a spreading section that circulates circumferentially along the rectangular receiving cavity to evenly spread the accumulated material across the supporting surface.

2. The rotary reduction furnace feeding auxiliary device according to claim 1, characterized in that, The tiling component includes: A suspension frame with vertical lifting mechanism; An auxiliary connecting block is slidably disposed on the suspension frame and moves along a first horizontal direction, which is parallel to a right-angle side of the rectangular storage cavity; A rectangular pusher tooth is slidably disposed on the auxiliary connecting block and moves along a second horizontal direction, wherein the second horizontal direction is perpendicular to the first horizontal direction; The transmission frame is connected to the rectangular pusher teeth; A rotating rod, the center of which is rotatably connected to the suspension frame, and one end of which is rotatably connected to the center of the transmission frame; A first driver is connected to the center drive of the rotating rod to drive the rotating rod to rotate.

3. The rotary reduction furnace feeding auxiliary device according to claim 2, characterized in that, The transmission frame includes a span beam and two sets of L-shaped vertical side beams. The center of the span beam is rotatably connected to one end of the rotating rod. The extension direction of the span beam is parallel to the first horizontal direction. One end of each set of L-shaped vertical side beams is connected to both ends of the span beam, and the other ends of the two sets of L-shaped vertical side beams are arranged opposite each other to connect to the rectangular push teeth.

4. The rotary reduction furnace feeding auxiliary device according to claim 3, characterized in that, The material feeding assembly includes a material feeding orifice plate, a cloth bag, and a circumferential shrinking and expanding mechanism. The material feeding orifice plate is located at the discharge port at the bottom of the temporary storage box. The cloth bag is fitted onto the material feeding orifice plate. The circumferential shrinking and expanding mechanism is located on the temporary storage box and on the side opposite to the rectangular storage cavity. The circumferential shrinking and expanding mechanism is used to adjust the opening size of the cloth bag.

5. The rotary reduction furnace feeding auxiliary device according to claim 4, characterized in that, The circumferential shrinking and expanding mechanism includes: Outer ring; An inner ring is located in the hollowed-out area in the middle of the outer ring and is coaxially arranged with the outer ring. The cloth bag passes through the inner wall of the inner ring. The pusher is movably mounted on the outer ring and the inner ring, and multiple sets of the pusher are provided, with the multiple sets of the pusher spaced apart along the circumference of the outer ring; The second driver is connected to the pusher via a transmission assembly to drive the pusher to move radially parallel to the outer ring.

6. The rotary reduction furnace feeding auxiliary device according to claim 5, characterized in that, The transmission assembly includes: A ring tooth is provided in the hollow area between the outer ring and the inner ring, and is coaxially arranged with the outer ring. The ring tooth is slidably disposed on the inner wall of the outer ring. A straight rack is provided on the pusher member, and the straight rack is connected to the ring gear transmission.

7. The rotary reduction furnace feeding auxiliary device according to claim 6, characterized in that, An intermediate gear is rotatably mounted on the outer ring, and the upper and lower ends of the intermediate gear are respectively meshed with the ring teeth and the straight rack.

8. The rotary reduction furnace feeding auxiliary device according to claim 5, characterized in that, The pusher is a straight slider. The end of the straight slider near the inner ring is provided with a surrounding plate. After the straight slider moves into place towards the inner ring, the surrounding plates close together to close the opening of the bag.

Images