Lightweight low heat storage roller kiln structure

Abstract

This invention proposes a lightweight, low-heat-storage roller kiln structure, including a support frame, a geared motor, conveying rollers, and sprockets. The geared motor is mounted on the side of the support frame, and several conveying rollers are movably connected to the inner side of the support frame. Each conveying roller has two sprockets fixedly connected to its end, and a chain is movably connected to the outer surface of each sprocket. Adjacent conveying rollers are linked by the sprockets and chains. The ends of two conveying rollers are connected to the output end of the geared motor. The advantages of this invention are: the device has a simple structure, consisting of a hot kiln section and a conveying section, forming a lightweight roller kiln structure. Simultaneously, the kiln body undergoes low-heat-storage modification, with nano-silica aerogel felt attached to the inner wall of the kiln body and an outer aluminum foil reflective layer covering it, reducing heat conduction to the support frame. This significantly reduces the outer surface temperature of the kiln body, substantially decreases the heat storage, and the aerogel insulation layer has a very short thermal response time, greatly shortening the time required for the cold kiln to heat up.

Description

Technical Field

[0001] This utility model relates to the field of roller kiln technology, and in particular to a lightweight, low-heat-storage roller kiln structure. Background Technology

[0002] Roller kilns, as core equipment for continuous or intermittent high-temperature heat treatment, are widely used in firing, sintering, annealing, and drying processes in industries such as ceramics, building materials, new materials, and electronic components. Their basic working principle involves using a drive unit to rotate parallel conveyor rollers, causing the kiln furniture (or the material itself) to move continuously or intermittently within the high-temperature kiln tunnel, thus completing the heat treatment process.

[0003] Traditional roller kiln structures mainly suffer from the following technical challenges:

[0004] Heavy structure, huge heat storage: To withstand high temperatures and high loads, traditional roller kilns typically use heavy steel structures (such as channel steel and I-beams) for their supporting frames, and the kiln body structural materials (such as refractory bricks and heavy ceramic fiberboard) have high heat capacity (volume heat capacity is usually 1.8-2.5 MJ / m³). 3 (K and above). This design results in a massive overall weight of the equipment, complex construction and installation, and high requirements for the plant foundation. More importantly, the enormous thermal mass means that the kiln requires a large amount of energy (usually accounting for 30% or even higher of the total energy consumption) and time (it may take several hours to more than ten hours to rise from room temperature to the operating temperature) during the start-up (commonly known as "kiln drying") phase to reach thermal equilibrium. During intermittent operation or when the equipment is shut down, a large amount of heat stored in the kiln (heat storage loss can account for 20-40% of the total energy consumption) is slowly dissipated into the environment through the furnace walls, resulting in huge energy waste. Therefore, a lightweight, low-heat storage roller kiln structure is proposed to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to at least solve one of the aforementioned technical defects.

[0006] Therefore, one objective of this utility model is to propose a lightweight, low-heat-storage roller kiln structure to solve the problems mentioned in the background art and overcome the shortcomings of the existing technology.

[0007] To achieve the above objectives, one embodiment of the present invention provides a lightweight, low-heat-storage roller kiln structure, including a support frame, a geared motor, conveying rollers, and a sprocket. The geared motor is mounted on the side of the support frame, and several conveying rollers are movably connected to the inner side of the support frame.

[0008] Two sprockets are fixedly connected to the end of each conveying roller, and a chain is movably connected to the outer surface of the sprockets. Adjacent conveying rollers are linked by the sprockets and the chain.

[0009] The ends of two of the conveying rollers are connected to the output end of the geared motor;

[0010] The top of the support is fixedly connected to the kiln body, and the middle of the kiln body is fixedly connected to a heat source, which is heated by electric heating.

[0011] Two side positioning frames are fixedly connected to the inner side of the bracket, and rails are fixedly connected to both ends of the top surface of the kiln body.

[0012] A cylinder is fixedly connected to the top of the track, and a sealing door is fixedly connected to the output end of the cylinder. The sealing door is movably connected to the track.

[0013] The inner side of the support is sealed at the bottom of the kiln body. A gel felt layer is fixedly connected to the inner wall of the kiln body, and an aluminum foil layer is fixedly connected to the surface of the gel felt layer.

[0014] Preferably, in any of the above solutions, the bracket and the geared motor are connected via a flange, and the conveying roller is made of stainless steel.

[0015] The above technical solution is adopted: This device is a roller kiln structure, consisting of two main parts:

[0016] Conveying section: It consists of a support frame, a geared motor, conveying rollers, and a sprocket structure. When the geared motor is working, it drives the conveying rollers to rotate. The conveying rollers are linked by sprockets and chains to convey materials. During material conveying, the materials are restricted by the side positioning frames on both sides to achieve the purpose of linear conveying.

[0017] The hot kiln section consists of a kiln body, which is heated by electricity, such as heating rods or heating wires. When the cylinder output end is pushed out, the closed section slides down the track, the two ends of the kiln body are closed, the conveying rollers stop running, and the heating is started to heat the material.

[0018] Preferably, in any of the above schemes, the connection between the inner wall of the kiln body and the gel felt layer is by riveting at the edge, and the notch of the side positioning frame is movably connected to the sealing door.

[0019] The above technical solution employs a simple structure, consisting of a heating kiln section and a conveying section, forming a lightweight track kiln structure. Simultaneously, the kiln interior undergoes low heat storage modification, with nano-silica aerogel felt (20mm thick, thermal conductivity 0.018W / m·K) attached to the inner wall of the kiln, and an outer aluminum foil reflective layer covering it to reduce heat conduction to the support structure. This significantly lowers the outer surface temperature of the kiln exterior, resulting in a substantial reduction in heat storage.

[0020] Preferably, in any of the above schemes, the side positioning frames are parallel to each other and spaced apart, and the track is enclosed.

[0021] The above technical solution is adopted. The device consists of: a support frame, welded from 6061-T6 aluminum alloy profiles, with an internal hollow structure, which reduces the weight by 40% compared to traditional steel frames. A side positioning frame is installed on the inner side of the support frame for guiding material conveying.

[0022] Conveying system: Conveying rollers: made of thin-walled stainless steel tubes (outer diameter 50mm, wall thickness 1.5mm), with an aluminum oxide-silicon carbide composite coating on the surface, which can withstand temperatures up to 800℃.

[0023] Sprockets and chains: The sprockets have 18 teeth and a module of 4. The chain is a self-lubricating ceramic roller chain (pitch 12.7mm) with a friction coefficient ≤0.1. Gear motor: Connected to the side of the bracket via a flange, it outputs a torque of 120 N·m, driving the conveyor rollers to rotate at an adjustable speed of 0.5-5 m / min.

[0024] Kiln body: Main structure: Constructed from 1.5mm thick 310S stainless steel plate, bent and welded, with an internal nano-silica aerogel felt layer and an external aluminum foil layer (reflectivity ≥95%). Heat source: Employs silicon carbide heating elements (power density 15W / cm²). 2 The temperature is evenly distributed along the middle of the kiln body, with a temperature control accuracy of ±5℃.

[0025] Sealing and gate control system: Track: Enclosed T-shaped guide rail, fixed to both ends of the kiln top surface, with hard chrome plating. Cylinder: Double-acting cylinder, vertically installed, output thrust 1.2kN. Door: Composed of zirconia fiberboard and carbon fiber frame, temperature resistant up to 1300℃, slidably connected to the track via pulleys.

[0026] Preferably, of any of the above solutions, the cylinder is installed vertically and the sealing door is adjustable in height.

[0027] Preferably, in any of the above embodiments, the gel felt layer is a nano-silica aerogel felt layer, and the thickness of the gel felt layer is 20 mm.

[0028] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows:

[0029] This lightweight, low-heat-storage roller kiln structure features a simple design, consisting of a heating kiln section and a conveying section. It is a lightweight track kiln structure. Furthermore, the kiln interior undergoes low-heat-storage modification, with nano-silica aerogel felt attached to the inner wall and an outer aluminum foil reflective layer covering it to reduce heat conduction to the support structure. This also significantly reduces the outer surface temperature of the kiln, resulting in a substantial decrease in heat storage.

[0030] The thermal response time of the aerogel insulation layer is very short, which greatly reduces the heating time of the cold kiln.

[0031] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0032] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0033] Figure 1 This is a first-view structural schematic diagram of the present invention;

[0034] Figure 2 This is a structural schematic diagram of the present invention from a second perspective;

[0035] Figure 3 This utility model Figure 1 Enlarged structural diagram at point A;

[0036] Figure 4 This is a schematic diagram of the structure of the inner wall layer of the kiln body of this utility model.

[0037] In the diagram: 1-support, 2-gear motor, 3-conveying roller, 4-sprocket, 5-kiln body, 6-heat source, 7-side positioning frame, 8-track, 9-cylinder, 10-sealing door, 11-gel felt layer, 12-aluminum foil layer. Detailed Implementation

[0038] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0039] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] like Figure 1-4 As shown, this lightweight low heat storage roller kiln structure includes a support 1, a geared motor 2, a conveying roller 3, and a sprocket 4. The geared motor 2 is installed on the side of the support 1, and several conveying rollers 3 are movably connected to the inner side of the support 1.

[0041] Two sprockets 4 are fixedly connected to the end of a single conveyor roller 3. A chain is movably connected to the outer surface of the sprockets 4, and adjacent conveyor rollers 3 are linked together by the sprockets 4 and the chain.

[0042] The ends of two of the conveying rollers 3 are connected to the output end of the geared motor 2;

[0043] The top of the support frame 1 is fixedly connected to the kiln body 5, and the middle of the kiln body 5 is fixedly connected to the heat source 6, which is heated by electric heating.

[0044] Two side positioning frames 7 are fixedly connected to the inner side of the bracket 1, and rails 8 are fixedly connected to both ends of the top surface of the kiln body 5.

[0045] A cylinder 9 is fixedly connected to the top of the track 8, and a sealing door 10 is fixedly connected to the output end of the cylinder 9. The sealing door 10 is movably connected to the track 8.

[0046] The inner side of the support 1 is sealed at the bottom of the kiln body 5. A gel felt layer 11 is fixedly connected to the inner wall of the kiln body 5, and an aluminum foil layer 12 is fixedly connected to the surface of the gel felt layer 11.

[0047] Example 1: The bracket 1 and the geared motor 2 are connected via a flange, and the conveyor roller 3 is made of stainless steel. The inner wall of the kiln body 5 is connected to the gel felt layer 11 by riveting at the edge, and the notch of the side positioning frame 7 is movably connected to the sealing door 10. The side positioning frames 7 are parallel to each other and spaced apart, and the track 8 is enclosed. The cylinder 9 is installed vertically, and the sealing door 10 can be raised and lowered. The gel felt layer 11 is specifically a nano-silica aerogel felt layer with a thickness of 20mm.

[0048] Example 2: This device is a roller kiln structure, consisting of two main parts:

[0049] The conveying section consists of a support frame 1, a reduction motor 2, a conveying roller 3, and a sprocket 4. When the reduction motor 2 is working, it drives the conveying roller 3 to rotate. The conveying rollers 3 are linked by the sprocket 4 and the chain to convey the material. When the material is conveyed, it is limited by the side positioning frames 7 on both sides to achieve the purpose of linear conveying.

[0050] The hot kiln section consists of a kiln body 5, which is heated by electricity, such as heating rods or heating wires. When the output end of the cylinder 9 is pushed out, the seal 10 slides down the track 8, the two ends of the kiln body 5 are closed, the conveying roller 3 stops running, and the heating is started to heat the material.

[0051] This device consists of: Support frame 1: welded from 6061-T6 aluminum alloy profiles, with an internal hollow structure, reducing weight by 40% compared to traditional steel frames. Side positioning frames 7 are installed inside support frame 1 for guiding material conveying.

[0052] Conveying system: Conveying roller 3: Made of thin-walled stainless steel tube (outer diameter 50mm, wall thickness 1.5mm), with an aluminum oxide-silicon carbide composite coating on the surface, which can withstand temperatures up to 800℃.

[0053] Sprocket 4 and chain: Sprocket 4 has 18 teeth and a module of 4. The chain is a self-lubricating ceramic roller chain (pitch 12.7mm) with a friction coefficient ≤0.1. Gear motor 2: Connected to the side of bracket 1 via a flange, it outputs a torque of 120 N·m and drives the conveyor roller 3 to rotate at an adjustable speed of 0.5-5 m / min.

[0054] Kiln body 5: Main structure: Constructed from 1.5mm thick 310S stainless steel plate, bent and welded, with an internal nano-silica aerogel felt layer 11 and an external aluminum foil layer 12 (reflectivity ≥95%). Heat source 6: Employs silicon carbide rod heating elements (power density 15W / cm²). 2 The temperature is evenly distributed along the middle of the kiln body 5, with a temperature control accuracy of ±5℃.

[0055] Sealing and gate control system: Track 8: Enclosed T-shaped guide rail, fixed to both ends of the top surface of kiln body 5, with hard chrome plating.

[0056] Cylinder 9: Double-acting cylinder, vertically mounted, output thrust 1.2kN. Door 10: Composed of zirconia fiberboard and carbon fiber frame, temperature resistant up to 1300℃, slidably connected to track 8 via pulleys.

[0057] The working principle of this utility model is as follows:

[0058] Start-up and feeding: Start the geared motor 2, and the conveyor roller 3 rotates in linkage with the chain through the sprocket 4. The material (such as ceramic blank) is fed in from the inlet end and is conveyed in a straight line to the inside of the kiln body 5 under the guidance of the side positioning frame 7.

[0059] During the kiln sealing and heating process, when the material reaches the predetermined position, the cylinder 9 pushes the sealing door 10 to slide down the track 8, sealing the openings at both ends of the kiln body 5, and the conveying roller 3 stops operating.

[0060] Heat source 6 is activated, silicon carbide rod is powered on and heats up, the temperature inside the kiln rises to the set value (e.g. 800℃) at a rate of 20℃ / min, and nano aerogel felt layer 11 prevents heat from being conducted to support 1.

[0061] During the heat preservation and cooling process, the constant temperature stage is maintained for 1-2 hours. The aluminum foil layer 12 reflects radiant heat, reducing heat loss. After firing, the heat source 6 is turned off, the cylinder 9 lifts the sealing door 10, and the conveying roller 3 rotates in the opposite direction to transport the material to the cooling zone.

[0062] After unloading and circulation, the material cooled to below 80°C is discharged through the outlet, and the system is reset to await the next batch of operation.

[0063] Compared with the prior art, the present invention has the following advantages:

[0064] This lightweight, low-heat-storage roller kiln structure features a simple design, consisting of a heating kiln section and a conveying section. It is a lightweight track kiln structure. Furthermore, the kiln body 5 undergoes low-heat-storage modification, with nano-silica aerogel felt attached to the inner wall and an aluminum foil reflective layer covering the outer layer to reduce heat conduction to the support structure. This also significantly reduces the outer surface temperature of the kiln body 5, resulting in a substantial decrease in heat storage.

[0065] The aerogel insulation layer 11 has a very short thermal response time, which greatly reduces the heating time of the cold kiln.

Claims

1. A lightweight, low-heat-storage roller kiln structure, characterized in that, It includes a support (1), a geared motor (2), a conveying roller (3), and a sprocket (4). The geared motor (2) is installed on the side of the support (1), and several conveying rollers (3) are movably connected to the inner side of the support (1). Two sprockets (4) are fixedly connected to the end of each conveying roller (3). A chain is movably connected to the outer surface of the sprockets (4). Adjacent conveying rollers (3) are linked by the sprockets (4) and the chain. The ends of two of the conveying rollers (3) are connected to the output end of the geared motor (2); The top of the support (1) is fixedly connected to the kiln body (5), and the middle part of the kiln body (5) is fixedly connected to the heat source (6), which is heated by electric heating. The inner side of the bracket (1) is fixedly connected to two side positioning frames (7), and the two ends of the top surface of the kiln body (5) are fixedly connected to rails (8); A cylinder (9) is fixedly connected to the top of the track (8), and a sealing door (10) is fixedly connected to the output end of the cylinder (9). The sealing door (10) is movably connected to the track (8). The inner side of the support (1) is sealed at the bottom of the kiln body (5). A gel felt layer (11) is fixedly connected to the inner wall of the kiln body (5), and an aluminum foil layer (12) is fixedly connected to the surface of the gel felt layer (11).

2. The lightweight, low-heat-storage roller kiln structure as described in claim 1, characterized in that: The bracket (1) is connected to the geared motor (2) via a flange, and the conveying roller (3) is made of stainless steel.

3. The lightweight, low-heat-storage roller kiln structure as described in claim 2, characterized in that: The inner wall of the kiln body (5) is connected to the gel felt layer (11) by riveting at the edge, and the notch of the side positioning frame (7) is movably connected to the sealing door (10).

4. The lightweight, low-heat-storage roller kiln structure as described in claim 3, characterized in that: The side positioning frames (7) are parallel to each other and spaced apart, and the track (8) is enclosed.

5. The lightweight, low-heat-storage roller kiln structure as described in claim 4, characterized in that: The cylinder (9) is installed vertically, and the sealing door (10) can be raised and lowered.

6. The lightweight, low-heat-storage roller kiln structure as described in claim 5, characterized in that: The gel felt layer (11) is specifically a nano-silica aerogel felt layer, and the thickness of the gel felt layer (11) is 20 mm.

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