A high temperature calcination kiln

Abstract

The utility model discloses a high temperature calcination kiln, including base, kiln body, supporting wheel spare, driving part and ring forming cleaning spare, supporting wheel spare and driving part all set up on the base, and ring forming cleaning spare interval sets up on the kiln body, and ring forming cleaning spare includes ceramic sleeve, bushing, jacks and removes guide rail, and ceramic sleeve is along the radial and is radially through and is nested on the circumference wall of kiln body, and bushing is detachably inserted in ceramic sleeve, and jacks are movably arranged in bushing, and one end of jacks extends to the inside of kiln body, and the other end of jacks corresponds with removing guide rail, and spring is sleeved on the rod outside kiln body of jacks, and removing guide rail is circular arc and is fixed above kiln body through support frame. The utility model discloses through the cooperation of jacks and removing guide rail, and jacks are pressed down and are pushed out by removing guide rail and impact the ring forming that adheres on the inner wall of kiln body with the rotation of kiln body, realize automatic removal ring forming, and compared with traditional manual shovel or kiln treatment, and the efficiency improvement is remarkable.

Description

Technical Field

[0001] This utility model relates to the field of metallurgical production equipment technology, specifically to a high-temperature roasting kiln. Background Technology

[0002] In zinc ingot production, zinc-containing raw materials need to be fed into a high-temperature roasting kiln for high-temperature defluorination and chlorination, producing zinc oxide calcined sand with a zinc content of over 55%. This calcined sand is then mixed with reducing agents such as coke, slagging agents such as lime, and quartz sand before being fed into an electric furnace for reduction smelting, producing electric furnace zinc ingots with a zinc content of over 99.5%. Currently, most high-temperature roasting kilns used are rotary kilns. When producing calcined sand in a rotary kiln, non-volatile metals such as iron are reduced and form hard iron-zinc eutectic rings with zinc, which adhere to the inner wall of the rotary kiln. Once these rings reach a certain thickness, they not only obstruct the feed at the front, causing backflow, but also increase the gravity load inside the kiln, increasing the equipment load. Therefore, it is necessary to periodically shut down the kiln and manually enter the kiln with a steel pipe to knock down the ring layer for mechanical cleaning, severely impacting production efficiency. Summary of the Invention

[0003] The main purpose of this utility model is to overcome the defects of the above-mentioned background technology and provide a high-temperature roasting kiln.

[0004] To achieve the above objectives, the present invention proposes a high-temperature calcining kiln, comprising a base, a kiln body, supporting rollers, a driving component, and a ring-cleaning component. The supporting rollers and the driving component are both mounted on the base. The outer wall of the kiln body is spaced with tires corresponding to the supporting rollers. The outer wall of the kiln body is provided with a large gear connected to the driving component. The ring-cleaning component is spaced on the kiln body and includes a ceramic sleeve, a bushing, a push rod, and a cleaning guide rail. The ceramic sleeve is radially inserted through and nested on the circumferential wall of the kiln body. The bushing is detachably inserted into the ceramic sleeve. The push rod is movably mounted within the bushing, with one end extending into the interior of the kiln body and the other end corresponding to the cleaning guide rail. A spring is fitted onto the push rod outside the kiln body. The cleaning guide rail is arc-shaped and fixed above the kiln body by a support frame.

[0005] To further optimize the technical solution, the inner walls of the upper and lower ends of the bushing are respectively provided with stepped surfaces, and the lower end of the push rod is provided with a stop block. When the push rod is retracted, the stop block is fully retracted into the lower end of the bushing and abuts against the stepped surface at the lower end.

[0006] To further optimize the technical solution, a sealing ring is provided inside the bushing tube, the middle part of the top rod moves through the sealing ring, an annular groove is opened on the inner wall of the bushing tube, a C-shaped retaining ring is provided in the annular groove, and the sealing ring is located between the stepped surface at the upper end of the bushing tube and the annular groove.

[0007] To further optimize the technical solution, an adjusting ring is fitted on the top rod, one end of the spring abuts against the upper end of the bushing tube, and the other end of the spring abuts against the bottom surface of the adjusting ring.

[0008] To further optimize the technical solution, a pressure roller is rotatably provided at the top of the top rod, and the wheel surface of the pressure roller corresponds to the rail surface of the cleaning guide rail.

[0009] To further optimize the technical solution, the sealing ring is made of carbon-carbon composite material and covered with a silicon carbide coating on its surface.

[0010] To further optimize the technical solution, the top rod is made of SiC fiber-reinforced nickel-based alloy composite material.

[0011] To further optimize the technical solution, a horizontal crossbar is provided at the lower end of the top rod.

[0012] To further optimize the technical solution, the inner wall of the kiln body is provided with an axially oriented receiving groove corresponding to the crossbar.

[0013] To further optimize the technical solution, a kiln head hood is provided at one end of the kiln body, a discharge port is provided at the bottom of the kiln head hood, a burner is provided on the kiln head hood, and the nozzle of the burner extends into the interior of the kiln body. A kiln tail hood is provided at the other end of the kiln body, and a feed pipe and a tail gas treatment pipe are respectively connected to the kiln tail hood.

[0014] The beneficial effects of this utility model include: when the kiln body rotates, the push rod rotates synchronously, while the cleaning guide rail remains stationary. When the top of the push rod rotates into the cleaning guide rail area, it is pressed down by the cleaning guide rail, overcoming the elastic force of the spring. The push rod is squeezed and moved towards the center of the kiln body, and the lower end of the push rod pushes out and impacts the rings attached to the inner wall of the kiln body. After the top of the push rod leaves the cleaning guide rail, it retracts back into the bushing tube under the restoring force of the spring, without obstructing the flow of materials. Automatic ring removal can be achieved without stopping the kiln, reducing the weight load on the kiln body. Compared with traditional manual removal or kiln shutdown, the efficiency is significantly improved, especially suitable for treating the iron-zinc eutectic hard rings commonly found in zinc oxide roasting. Attached Figure Description

[0015] Figure 1 This is an overall schematic diagram of the high-temperature calcining kiln in an embodiment of this utility model.

[0016] Figure 2 This is a schematic diagram of the assembly of the push rod and the cleaning guide rail in an embodiment of this utility model.

[0017] Figure 3 This is an exploded view of the ring-cleaning component in an embodiment of this utility model.

[0018] Figure 4 This is a schematic diagram of the bushing tube in an embodiment of this utility model.

[0019] Reference numerals: 1. Base; 2. Kiln body; 201. Tire; 202. Large gear; 203. Receiving groove; 3. Support roller; 4. Drive component; 5. Ring cleaning component; 501. Ceramic sleeve; 502. Liner; 5021. Step surface; 5022. Annular groove; 503. Top rod; 5031. Stop block; 5032. Adjusting ring; 5033. Pressure roller; 504. Cleaning guide rail; 505. Spring; 506. Support frame; 507. Sealing ring; 508. C-type retaining ring; 509. Crossbar; 6. Kiln head hood; 601. Discharge port; 7. Burner; 8. Kiln tail hood; 9. Feed pipe; 10. Exhaust gas treatment pipe. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects of the embodiments of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0021] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component. Furthermore, a connection can be for both fixing and circuit connection purposes.

[0022] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] Please see Figures 1 to 4In one embodiment, a high-temperature calcining kiln includes a base 1, a kiln body 2, support rollers 3, a drive unit 4, and a ring-cleaning component 5. The support rollers 3 and the drive unit 4 are both mounted on the base 1. Tires 201 corresponding to the support rollers 3 are spaced apart on the outer wall of the kiln body 2. A large gear 202 connected to the drive unit 4 is also provided on the outer wall of the kiln body 2. Multiple sets of ring-cleaning components 5 are spaced apart on the kiln body 2. Each ring-cleaning component 5 includes a ceramic sleeve 501, a liner 502, a top rod 503, and a cleaning guide rail 504. The sleeve 501 is radially embedded in the circumferential wall of the kiln body 2. The liner 502 is detachably inserted into the ceramic sleeve 501, and the ceramic sleeve 501 and the liner 502 are interference-fitted. The push rod 503 is movably disposed in the liner 502. One end of the push rod 503 extends into the interior of the kiln body 2, and the other end of the push rod 503 corresponds to the cleaning guide rail 504. A spring 505 is sleeved on the rod of the push rod 503 located outside the kiln body 2. The cleaning guide rail 504 is arc-shaped and fixed above the kiln body 2 by the support frame 506. Specifically, the base 1 is made of concrete, the kiln body 2 is cylindrical and is inclined on the base 1 at an angle of 3°. The outer diameter of the kiln body 2 is 3.3m, the inner diameter is 2.7m, and the length is 42m. The drive unit 4 is a combination of a motor and a gearbox. The motor provides rotational power, and the gearbox realizes the conversion of speed reduction and torque increase. Finally, the output drives the large gear 202 to rotate, thereby driving the kiln body 2 to rotate. The support frame 506 is fixed on both sides of the base 1, and the center of the guide rail 504 falls on the axis of the kiln body 2. In this embodiment, when the kiln body 2 rotates, the ceramic sleeve 501, the bushing 502, and the push rod 503 rotate synchronously, while the cleaning guide 504 remains stationary. When the top of the push rod 503 rotates into the area of ​​the cleaning guide 504, it is pressed down by the cleaning guide 504, overcoming the elastic force of the spring 505. The push rod 503 is squeezed and moved towards the center of the kiln body 2, pushing out the rings attached to the inner wall of the kiln body 2, causing the rings to fall off and achieving automatic removal of the rings. Compared with traditional manual removal or kiln shutdown, this method can reduce the labor intensity of manual ring removal and significantly improve production efficiency. It is especially suitable for treating the iron-zinc eutectic hard rings commonly found in zinc oxide roasting.

[0025] In a preferred embodiment, stepped surfaces 5021 are respectively provided on the inner walls of the upper and lower ends of the bushing tube 502, and a stop block 5031 is provided at the lower end of the push rod 503. When the top end of the push rod 503 leaves the cleaning guide rail 504, the push rod 503 retracts under the restoring force of the spring 505, and the lower end of the push rod 503 is retracted into the bushing tube 502 to prevent the push rod 503 from protruding from the inner wall of the kiln body 2 and affecting the flow of the internal raw materials. After retraction, the stop block 5031 is fully retracted into the lower end of the bushing tube 502 and abuts against the stepped surface 5021 at the lower end to lock it and prevent the push rod 503 from disengaging.

[0026] In a preferred embodiment, a sealing ring 507 is provided inside the bushing tube 502. The middle part of the push rod 503 moves through the sealing ring 507. An annular groove 5022 is opened on the inner wall of the bushing tube 502. A C-shaped retaining ring 508 is provided in the annular groove 5022. The sealing ring 507 is located between the stepped surface 5021 and the annular groove 5022 at the upper end of the bushing tube 502. The stepped surface 5021 and the annular groove 5022 serve as upper and lower limit references for the sealing ring 507, preventing the sealing ring 507 from moving when the push rod is pushed out or retracted. The C-shaped retaining ring 508 axially compresses the sealing ring 507 to lock it, so that the sealing ring 507 generates radial expansion force to tightly adhere to the push rod 503 and the bushing tube 502, preventing the material or dust-laden flue gas inside the kiln body 2 from leaking from the gap between the push rod 503 and the bushing tube 502.

[0027] In a preferred embodiment, an adjusting ring 5032 is fitted onto the top rod 503. One end of the spring 505 abuts against the upper end of the bushing 502, and the other end of the spring 505 abuts against the bottom surface of the adjusting ring 5032. Specifically, the top rod 503 has an external thread section, and the adjusting ring 5032 has an internal thread section. The adjusting ring 5032 is threadedly connected to the top rod 503. By rotating and adjusting the position of the adjusting ring 5032, the compression of the spring 505 is adjusted to ensure that the preload of the spring 505 is sufficient to resist the micro-displacement caused by the vibration of the kiln body 2 when the top rod 503 is in its initial position.

[0028] In a preferred embodiment, a pressure roller 5033 is rotatably provided at the top end of the push rod 503, and the wheel surface of the pressure roller 5033 corresponds to the rail surface of the cleaning guide rail 504. By using the pressure roller 5033, the contact mode between the push rod 503 and the cleaning guide rail 504 is changed from sliding friction to rolling friction, reducing driving resistance. When the kiln body 2 rotates, the extension and retraction of the push rod 503 is smoother, avoiding failure of the cleaning action due to friction jamming.

[0029] In a specific embodiment, the sealing ring 507 can be made of carbon-carbon composite material and covered with a silicon carbide coating. The carbon-carbon composite material matrix has a low coefficient of thermal expansion but can withstand temperatures above 1650℃, meeting the requirements for high-temperature sealing. Moreover, the silicon carbide coating can improve the oxidation resistance of the matrix, reduce the coefficient of friction, and improve the reliability of dynamic sealing. The push rod 503 can be made of SiC fiber reinforced nickel-based alloy composite material. SiC fiber can provide ultra-high strength and modulus, so that the strength of the push rod 503 in the 800-1200℃ firing zone is 1.2 times that at room temperature, avoiding thermal fatigue fracture of the push rod 503 and improving the thermal fatigue resistance and impact toughness of the push rod 503.

[0030] In a preferred embodiment, a horizontal bar 509 is provided at the lower end of the top rod 503. The horizontal bar 509 is parallel to the axis of the kiln body 2. The horizontal bar 509 can increase the effective area of ​​the top rod 503 and improve the cleaning efficiency.

[0031] In a preferred embodiment, an axially oriented receiving groove 203 corresponding to the crossbar 509 is provided on the inner wall of the kiln body 2. When the top rod 503 is retracted, the crossbar 509 is locked in the receiving groove 203, preventing the crossbar 509 from protruding from the inner wall of the kiln body 2 and affecting the flow of internal materials.

[0032] In a specific embodiment, a kiln head hood 6 is provided at one end of the kiln body 2, and a discharge port 601 is provided at the bottom of the kiln head hood 6. A burner 7 is provided on the kiln head hood 6, and the nozzle of the burner 7 extends into the interior of the kiln body 2. The burner 7 is an existing device, and its specific structure and principle will not be described in detail. A kiln tail hood 8 is provided at the other end of the kiln body 2. A feed pipe 9 and a tail gas treatment pipe 10 are respectively connected to the kiln tail hood 8. The zinc oxide raw material enters the interior of the kiln body 2 through the feed pipe 9 for roasting. The flue gas generated by roasting is led out through the tail gas treatment pipe 10 to the external flue gas treatment equipment for treatment.

[0033] The above description, in conjunction with specific / preferred embodiments, provides a further detailed explanation of the present invention and should not be construed as limiting the specific implementation of the present invention to these descriptions. For those skilled in the art, various substitutions or modifications can be made to these described embodiments without departing from the concept of the present invention, and all such substitutions or modifications should be considered within the protection scope of the present invention. In the description of this specification, the reference to terms such as "an embodiment," "some embodiments," "preferred embodiment," "example," "specific example," or "some examples," etc., indicates that the 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 described specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples. Without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples. Although embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations may be made herein without departing from the scope of protection of the patent application.

Claims

1. A high-temperature firing kiln, characterized in that: The system includes a base, kiln body, support rollers, drive unit, and ring-cleaning components. The support rollers and drive unit are both mounted on the base. The outer wall of the kiln body is spaced with tires corresponding to the support rollers. The outer wall of the kiln body is equipped with a large gear connected to the drive unit. The ring-cleaning components are spaced on the kiln body and include a ceramic sleeve, a bushing, a push rod, and a cleaning guide rail. The ceramic sleeve is radially inserted through and nested on the circumferential wall of the kiln body. The bushing is detachably inserted into the ceramic sleeve. The push rod is movably mounted within the bushing, with one end extending into the interior of the kiln body and the other end corresponding to the cleaning guide rail. A spring is fitted onto the push rod outside the kiln body. The cleaning guide rail is arc-shaped and fixed above the kiln body by a support frame.

2. The high-temperature calcining kiln as described in claim 1, characterized in that: The inner walls at both the upper and lower ends of the bushing are respectively provided with stepped surfaces. The lower end of the push rod is provided with a stop block. When the push rod is retracted, the stop block is fully retracted into the lower end of the bushing and abuts against the stepped surface at the lower end.

3. The high-temperature firing kiln as described in claim 2, characterized in that: The bushing tube is provided with a sealing ring inside, and the middle part of the push rod moves through the sealing ring. An annular groove is opened on the inner wall of the bushing tube, and a C-shaped retaining ring is provided in the annular groove. The sealing ring is located between the stepped surface at the upper end of the bushing tube and the annular groove.

4. The high-temperature firing kiln as described in claim 3, characterized in that: An adjusting ring is fitted onto the top rod. One end of the spring abuts against the upper end of the bushing tube, and the other end of the spring abuts against the bottom surface of the adjusting ring.

5. The high-temperature firing kiln as described in claim 4, characterized in that: The top of the push rod is rotatably equipped with a pressure roller, and the wheel surface of the pressure roller corresponds to the rail surface of the cleaning guide.

6. The high-temperature roasting kiln as described in claim 5, characterized in that: The sealing ring is made of carbon-carbon composite material and is covered with a silicon carbide coating on its surface.

7. The high-temperature roasting kiln as described in claim 6, characterized in that: The push rod is made of SiC fiber-reinforced nickel-based alloy composite material.

8. The high-temperature firing kiln as described in any one of claims 1 to 7, characterized in that: The lower end of the top rod is provided with a horizontal crossbar.

9. The high-temperature roasting kiln as described in claim 8, characterized in that: The inner wall of the kiln body is provided with an axially oriented receiving groove corresponding to the crossbar.

10. The high-temperature roasting kiln as described in claim 9, characterized in that: One end of the kiln body is provided with a kiln head hood, the bottom of the kiln head hood is provided with a discharge port, the kiln head hood is provided with a burner, the nozzle of the burner extends into the interior of the kiln body, the other end of the kiln body is provided with a kiln tail hood, and the kiln tail hood is respectively connected with a feed pipe and a tail gas treatment pipe.

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