Medium-frequency electromagnetic induction heating rotary kiln

Abstract

The utility model discloses a medium-frequency electromagnetic induction heating rotary kiln, which belongs to the technical field of medium-frequency electromagnetic induction heating rotary kilns and comprises a rotary kiln tube, at least one pair of tug supporting structures is arranged below the rotary kiln tube and used for supporting the rotary kiln tube, and a driving mechanism is arranged on the rotary kiln tube. A plurality of pairs of supporting plates are fixedly installed on the rotary furnace pipe, a plurality of sets of winding supporting rods are arranged between each pair of supporting plates, the multiple sets of winding supporting rods are arranged in a circumferential mode, and induction coils are wound on the multiple sets of winding supporting rods. Compared with the prior art, the medium-frequency electromagnetic induction heating rotary kiln has the advantages that when the coil is assembled, the distance between the coil and the rotary furnace tube can be adjusted according to the wall thickness of the rotary furnace tube, so that the coil can have enough electromagnetic penetration depth, and the whole wall thickness of the rotary furnace tube is within a heating range; therefore, the electromagnetic heating device is in a steady-state electromagnetic heating state.

Description

Technical Field

[0001] This utility model belongs to the technical field of medium-frequency electromagnetic induction heating rotary kiln, specifically concerning medium-frequency electromagnetic induction heating rotary kiln. Background Technology

[0002] The medium-frequency electromagnetic induction heating rotary kiln is a special equipment for calcining materials at high temperatures using a new type of external heating heat source. It belongs to the category of traditional mining equipment and is commonly used for calcining various mineral materials such as cement raw materials like limestone and alumina. Modern extensions can also be used for calcining new materials such as nickel slag and graphite, the positive and negative electrode materials for batteries.

[0003] The principle of electromagnetic heating is based on Faraday's law of electromagnetic induction and Joule's law of heating. An alternating magnetic field is generated when an electric current is passed through the electromagnetic heating coil. When this magnetic field passes through the rotary kiln tube, the free electrons inside are subjected to an induced force and move at high speed. Due to the resistance between electrons, their high-speed movement causes them to collide, converting their kinetic energy into Joule heat energy.

[0004] In electromagnetic heating, current penetration depth is a crucial concept. At mid-frequency (50-3000Hz), the current penetration depth is approximately 10-80mm, allowing the furnace tube to maintain steady-state electromagnetic heating. Since the electromagnetic wavelength penetrates deeper than the furnace tube itself, the entire wall thickness of the tube is within the heating range, which benefits the tube's lifespan. At this frequency, the distance (h) between the induction coil and the heated metal conductor can be increased to 100-150mm, sacrificing some power. At this distance, using the best aerospace-grade insulation materials, the insulation layer can effectively maintain the kiln's temperature. This solution completely resolves the previous limitations that prevented widespread adoption.

[0005] However, since the wall thickness of furnace tubes varies for different purposes, if the distance between the induction coil and the heating metal conductor is kept fixed, it is very easy to cause insufficient electromagnetic penetration depth during coil assembly, making it difficult to ensure that the entire wall thickness of the furnace tube is within the heating range, thus making it difficult for the furnace tube to be in a steady-state electromagnetic heating state.

[0006] Therefore, in order to address the aforementioned technical issues, it is necessary to provide a rotary kiln with medium-frequency electromagnetic induction heating.

[0007] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0008] The purpose of this utility model is to provide a medium-frequency electromagnetic induction heating rotary kiln, which can solve the problem that since the wall thickness of the furnace tube is generally different for different purposes, if the distance between the induction coil and the heating metal conductor is kept fixed, it is very easy to cause insufficient electromagnetic penetration depth during coil assembly, making it difficult to ensure that the entire wall thickness of the furnace tube is within the heating range, and thus making it difficult for the furnace tube to be in a steady-state electromagnetic heating state.

[0009] To achieve the above objectives, the technical solution provided by a specific embodiment of this utility model is as follows:

[0010] A medium-frequency electromagnetic induction heating rotary kiln includes a rotary kiln tube, at least one pair of tug wheel support structures are provided below the rotary kiln tube to support the rotary kiln tube, and a drive mechanism is provided on the rotary kiln tube.

[0011] Multiple pairs of support plates are fixedly installed on the rotary kiln tube. Multiple sets of winding support rods are arranged between each pair of support plates. The multiple sets of winding support rods are arranged in a circle. Induction coils are wound on the multiple sets of winding support rods.

[0012] Multiple sets of adjustment and fixing components are fixedly installed on the support plate. Each set of adjustment and fixing components is matched with a set of winding support rods for adjusting and fixing the winding support rods.

[0013] Multiple sets of fixing rods are also fixedly installed between each pair of support plates, and external protective insulation components are installed on the multiple sets of fixing rods.

[0014] In one or more embodiments of this utility model, the multiple sets of adjustment and fixing components include multiple sets of clamping blocks, the multiple sets of clamping blocks are respectively fixedly installed on the support plate, the multiple sets of clamping blocks are arranged in a circle, and the ends of the multiple sets of winding support rods are respectively inserted into the multiple sets of clamping blocks;

[0015] Multiple sets of pre-set holes are provided on each of the clamping blocks, and bolts and nuts are inserted through the pre-set holes.

[0016] In one or more embodiments of this utility model, the multiple sets of preset holes are arranged at equal intervals.

[0017] In one or more embodiments of this utility model, the external protective insulation component includes a protective tube, with a first fixing ring and a second fixing ring fixedly installed at both ends of the protective tube, and multiple sets of ear pieces fixedly installed on the first fixing ring and the second fixing ring, with through holes opened on the multiple sets of ear pieces, and the multiple sets of ear pieces slidably installed on multiple sets of fixing rods through the through holes.

[0018] In one or more embodiments of this utility model, the protective pipe is a folded corrugated pipe, and an insulation board is provided on the inner wall of the protective pipe.

[0019] In one or more embodiments of this utility model, the support plate is provided with multiple sets of slots, which match the ear pieces.

[0020] In one or more embodiments of this utility model, a lever is fixedly installed on the ear piece.

[0021] In one or more embodiments of the present invention, the tow wheel support structure includes a base on which a pair of tow wheels are rotatably connected.

[0022] In one or more embodiments of this utility model, a boss is provided on the rotary kiln tube, and a groove is provided on the traction wheel, wherein the boss and the groove are matched.

[0023] In one or more embodiments of this utility model, the driving mechanism includes a gear ring and a motor. The gear ring is fixedly installed on the rotary kiln tube, and a gear is fixedly installed at the output end of the motor. The gear meshes with the gear ring.

[0024] Compared with the prior art, the present invention's medium-frequency electromagnetic induction heating rotary kiln can adjust the distance between the coil and the rotary kiln tube according to the wall thickness of the rotary kiln tube during coil assembly, ensuring that the coil has sufficient electromagnetic penetration depth so that the entire wall thickness of the rotary kiln tube is within the heating range, thus achieving a steady-state electromagnetic heating state. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a structural diagram of a medium-frequency electromagnetic induction heating rotary kiln in one embodiment of the present invention;

[0027] Figure 2 This is a partial exploded view of a rotary kiln with medium-frequency electromagnetic induction heating in one embodiment of the present invention;

[0028] Figure 3 This is a structural diagram of the protective tube of a rotary kiln with medium-frequency electromagnetic induction heating in one embodiment of the present invention;

[0029] Figure 4 This is a side view of the support plate of a medium-frequency electromagnetic induction heating rotary kiln in one embodiment of the present invention;

[0030] Figure 5 This invention relates to a rotary kiln with medium-frequency electromagnetic induction heating, as described in one embodiment of the present invention. Figure 1 Enlarged view of point A in the middle;

[0031] Figure 6 This invention relates to a rotary kiln with medium-frequency electromagnetic induction heating, as described in one embodiment of the present invention. Figure 2 Enlarged view of section B in the middle.

[0032] Explanation of key figure labels:

[0033] 1. Rotary kiln tube; 101. Boss; 2. Base; 201. Drag wheel; 2011. Groove; 3. Gear ring; 4. Motor; 5. Gear; 6. Protective tube; 601. First fixing ring; 602. Second fixing ring; 603. Ear; 6031. Through hole; 6032. Pulling block; 7. Support plate; 701. Slot; 8. Fixing rod; 9. Induction coil; 10. Winding support rod; 11. Clamping block; 1101. Preset hole; 12. Bolt, nut, and fastener. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0035] like Figures 1-6 As shown, in one embodiment of the present invention, a medium-frequency electromagnetic induction heating rotary kiln includes a rotary kiln tube 1. At least one pair of roller support structures are provided below the rotary kiln tube 1. The roller support structure includes a base 2, which is fixed to the ground or a specific bracket. A pair of rollers 201 are rotatably connected to the base 2. The pair of rollers 201 are located on both sides of the rotary kiln tube 1, which can support the rotary kiln tube 1 and enable the rotary kiln tube 1 to rotate.

[0036] At least one pair of protrusions 101 are provided on the outer wall of the rotary kiln tube 1, and a groove 2011 is provided on the drag wheel 201. During the process of the drag wheel 201 supporting the rotary kiln tube 1, the protrusions 101 are located inside the groove 2011, so that the drag wheel 201 and the rotary kiln tube 1 have a limiting effect, preventing the deviation during the rotation process and ensuring safe and stable support for the rotary kiln tube 1.

[0037] A drive mechanism is provided on the rotary kiln tube 1. The drive mechanism includes a gear ring 3 and a motor 4. The gear ring 3 is fixedly installed on the outer wall of the rotary kiln tube 1. A gear 5 is fixedly installed on the output end of the motor 4, and the gear 5 meshes with the gear ring 3. The motor 4 drives the gear 5 to rotate, so that the gear 5 can drive the rotary kiln tube 1 to rotate through the gear ring 3, thereby driving the rotary kiln tube 1 to rotate.

[0038] In this embodiment, as Figure 2 As shown, two pairs of support plates 7 are fixedly installed on the rotary kiln tube 1, and both pairs of support plates 7 are fixed to the ground or a specific bracket. Multiple sets of winding support rods 10 are arranged circumferentially between each pair of support plates 7, and an induction coil 9 is wound on each of the multiple sets of winding support rods 10. The multiple sets of winding support rods 10 arranged circumferentially can support the induction coil 9, facilitating the winding and assembly of the induction coil 9.

[0039] Preferably, the induction coil 9 is made of copper tubing, which is structurally resistant to damage, has a certain strength, and a long service life.

[0040] The rotary kiln is externally heated using medium-frequency electromagnetic induction heating via induction coil 9, with a frequency range of 50-3000Hz. Compared to the traditional heating kiln, which takes at least 3 to tens of hours to heat up, this method saves at least 1 / 4 of the heating time. It operates without an open flame, offers high temperature control, and provides excellent safety. Medium-frequency electromagnetic induction heating directly heats the metal itself; traditional resistance heating requires heating the resistance element first, which is then conducted to the metal. This eliminates a heat loss step in the basic physical heat conduction process, resulting in higher energy efficiency.

[0041] like Figure 2 , Figure 4 and Figure 6 As shown, multiple sets of adjustment and fixing components are fixedly installed on one side of the support plate 7. The multiple sets of adjustment and fixing components include multiple sets of clamping blocks 11. The multiple sets of clamping blocks 11 are welded and fixed to one side of the support plate 7 respectively. The multiple sets of clamping blocks 11 on each support plate 7 are arranged in a circle. The ends of multiple sets of winding support rods 10 are respectively inserted into the multiple sets of clamping blocks 11.

[0042] Multiple sets of clamping blocks 11 each have multiple sets of preset holes 1101, through which bolts and nuts 12 pass. After the end of the winding support rod 10 is inserted into the corresponding clamping block 11, it can be locked and fixed by bolts and nuts 12, thus assembling the winding support rod 10 between a pair of support plates 7.

[0043] Multiple sets of preset holes 1101 are arranged at equal intervals. The ends of the winding support rod 10 can be fixed at different positions of the clamping block 11 through the multiple sets of preset holes 1101, so that the winding support rod 10 can be adjusted and installed.

[0044] Specifically, the two ends of multiple sets of winding support rods 10 are respectively inserted into multiple sets of clamping blocks 11 on one side of a pair of support plates 7. By simultaneously adjusting the distance between the multiple sets of winding support rods 10 and the outer wall of the rotary kiln tube 1, the winding diameter of the induction coil 9 can be adjusted, thereby adjusting the distance between the induction coil 9 and the outer wall of the rotary kiln tube 1. Thus, when assembling the induction coil 9, its electromagnetic penetration depth can be adjusted according to the wall thickness of the rotary kiln tube 1, ensuring that the entire wall thickness of the rotary kiln tube 1 is within the heating range, so as to be in a steady-state electromagnetic heating state.

[0045] like Figure 1 and Figure 2 As shown, multiple sets of fixing rods 8 are also fixedly installed between each pair of support plates 7. The multiple sets of fixing rods 8 are used to support and fix a pair of support plates 7, thereby improving the overall structural strength.

[0046] Multiple sets of fixing rods 8 are equipped with external protective insulation components. The external protective insulation components include protective tubes 6, which are sleeved on the outside of the induction coil 9. They can protect the protective tubes 6 and also provide insulation to reduce heat loss.

[0047] The protective pipe 6 is a folded corrugated pipe, and an insulation board is installed on its inner wall. The protective pipe 6 can be folded, contracted, and extended arbitrarily for flexible installation and use. The insulation board enhances the insulation effect of the protective pipe 6, further reducing heat loss.

[0048] like Figure 3 As shown, a first fixing ring 601 and a second fixing ring 602 are fixedly installed at both ends of the protective tube 6, and the two ends of the protective tube 6 are fixed to a pair of support plates 7 by the first fixing ring 601 and the second fixing ring 602 respectively.

[0049] like Figure 5 As shown, multiple sets of lugs 603 are fixedly installed on both the first fixing ring 601 and the second fixing ring 602. Each set of lugs 603 has a through hole 6031. The multiple sets of lugs 603 are slidably installed on multiple sets of fixing rods 8 through the through holes 6031, so that the fixing rods 8 can indirectly support the protective tube 6. Furthermore, the lugs 603 can slide on the fixing rods 8, which means that both the first fixing ring 601 and the second fixing ring 602 can slide flexibly on the fixing rods 8, so that the protective tube 6 can slide, extend, and retract.

[0050] The support plate 7 is provided with multiple sets of slots 701, which match the ear pieces 603. The multiple sets of ear pieces 603 on the first fixing ring 601 and the second fixing ring 602 can be respectively engaged with the multiple sets of slots 701 on the pair of support plates 7, so as to fix the first fixing ring 601 and the second fixing ring 602 on the pair of support plates 7.

[0051] A lever 6032 is fixedly installed on the ear piece 603, which facilitates the opening of the ear piece 603 from the slot 701, thereby enhancing operability.

[0052] Specifically, the first fixing ring 601 and the second fixing ring 602 are respectively fixed on a pair of support plates 7. When the induction coil 9 needs to be inspected and maintained, multiple sets of lugs 603 can be removed in sequence, and the first fixing ring 601 or the second fixing ring 602 can be pulled to slide on the fixing rod 8, thereby folding and retracting the protective tube 6. The protective tube 6 can then be opened to inspect and maintain the induction coil 9, which is very convenient.

[0053] In use, medium-frequency electromagnetic induction heating with a frequency range of 50-3000Hz is performed by induction coil 9 to externally heat the rotary kiln tube 1. At the same time, motor 4 drives gear ring 3 to rotate through drive gear 5, that is, drives rotary kiln tube 1 to rotate and rotate to heat the material inside.

[0054] Compared with the prior art, the present invention's medium-frequency electromagnetic induction heating rotary kiln can adjust the distance between the coil and the rotary kiln tube 1 according to the wall thickness of the rotary kiln tube 1 during coil assembly, ensuring that the coil has sufficient electromagnetic penetration depth so that the entire wall thickness of the rotary kiln tube 1 is within the heating range, thus achieving a steady-state electromagnetic heating state.

[0055] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0056] 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 medium-frequency electromagnetic induction heating rotary kiln, comprising a rotary kiln pipe, at least one pair of tow wheel support structures is arranged below the rotary kiln pipe to support the rotary kiln pipe, and a driving mechanism is arranged on the rotary kiln pipe, characterized in that: a plurality of pairs of support plates are fixedly installed on the rotary kiln pipe, a plurality of groups of winding support rods are arranged between each pair of support plates, the plurality of groups of winding support rods are arranged in a circle, and induction coils are wound on the plurality of groups of winding support rods; a plurality of groups of adjusting and fixing assemblies are fixedly installed on the support plates, the plurality of groups of adjusting and fixing assemblies are matched with the plurality of groups of winding support rods respectively, and are used for adjusting and fixing the winding support rods; a plurality of groups of fixing rods are also fixedly installed between each pair of support plates, and an outer protective and heat preservation assembly is installed on the plurality of groups of fixing rods.

2. The intermediate frequency electromagnetic induction heating rotary kiln according to claim 1, characterized in that, The plurality of groups of adjusting and fixing assemblies comprise a plurality of groups of clamping blocks, the plurality of groups of clamping blocks are fixedly installed on the support plates respectively, the plurality of groups of clamping blocks are arranged in a circle, and the ends of the plurality of groups of winding support rods are respectively inserted into the plurality of groups of clamping blocks; a plurality of groups of preset holes are formed in the plurality of groups of clamping blocks, and bolts and nuts fasteners are penetrated through the preset holes.

3. The intermediate frequency electromagnetic induction heating rotary kiln according to claim 2, characterized in that, The plurality of groups of preset holes are arranged at equal intervals.

4. The intermediate frequency electromagnetic induction heating rotary kiln according to claim 1, characterized in that, The outer protective and heat preservation assembly comprises a protective pipe, first and second fixing rings are fixedly installed at the two ends of the protective pipe respectively, a plurality of groups of lugs are fixedly installed on the first and second fixing rings, through holes are formed in the plurality of groups of lugs, and the plurality of groups of lugs are slidably installed on the plurality of groups of fixing rods through the through holes.

5. The intermediate frequency electromagnetic induction heating rotary kiln according to claim 4, characterized in that, The protective pipe is a folded corrugated pipe, and a heat preservation plate is arranged on the inner wall of the protective pipe.

6. The intermediate frequency electromagnetic induction heating rotary kiln according to claim 4, characterized in that, A plurality of clamping grooves are arranged on the support plates, and the clamping grooves are matched with the lugs.

7. The intermediate frequency electromagnetic induction heating rotary kiln according to claim 6, characterized in that, A pushing block is fixedly installed on the lug.

8. The intermediate frequency electromagnetic induction heating rotary kiln according to claim 1, characterized in that, The tow wheel support structure comprises a base, and a pair of tow wheels are rotatably connected to the base.

9. The intermediate frequency electromagnetic induction heating rotary kiln according to claim 8, characterized in that, A boss is arranged on the rotary kiln pipe, a groove is arranged on the tow wheel, and the boss is matched with the groove.

10. The intermediate frequency electromagnetic induction heating rotary kiln according to claim 1, characterized in that, The driving mechanism comprises a gear ring and a motor, the gear ring is fixedly installed on the rotary kiln pipe, a gear is fixedly installed at the output end of the motor, and the gear is meshedly connected with the gear ring.

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