CN218994009U

CN218994009U - Nitrogen atmosphere protection roller kiln

Info

Publication number: CN218994009U
Application number: CN202222997995.6U
Authority: CN
Inventors: 李成文; 陈文元; 李冬梅; 李韬; 周积礼
Original assignee: Foshan Tianlu Intelligent Equipment Technology Co Ltd
Current assignee: Foshan Tianlu Intelligent Equipment Technology Co Ltd
Priority date: 2022-11-10
Filing date: 2022-11-10
Publication date: 2023-05-09
Anticipated expiration: 2032-11-10

Abstract

The utility model discloses a nitrogen atmosphere protection roller kiln, which belongs to the technical field of roller kilns and comprises a roller kiln body, wherein a transmission roller set and a heating device are arranged in the roller kiln body, the roller kiln body is sequentially divided into a plurality of kiln segments, an air inlet pipe and an atmosphere storage tank are arranged in each kiln segment, the air inlet pipe is connected with the atmosphere storage tank through a pipeline, the air inlet pipe comprises an outer hollow sleeve pipe and an inner guide pipe, the outer hollow sleeve pipe is sleeved on the inner guide pipe, a conduction gap is reserved between the outer hollow sleeve pipe and the inner guide pipe, a plurality of groups of spiral guide grooves are arranged on the outer side surface of the inner guide pipe, a plurality of groups of air outlet holes communicated with the conduction gap are formed in the outer hollow sleeve pipe, when the protection atmosphere is conveyed to the far end along the spiral guide grooves and the conduction gap, the protection atmosphere is synchronously heated, and the temperature can be effectively exchanged and heated for the time of heating the protection atmosphere to be close to the kiln temperature as much as possible when entering the kiln segments, so that the temperature of the protection atmosphere is prevented from being excessively different from the local kiln temperature fluctuation.

Description

Nitrogen atmosphere protection roller kiln

Technical Field

The utility model relates to the technical field of roller kilns, in particular to a nitrogen atmosphere protection roller kiln.

Background

With the development of new energy industry, the market demand of lithium battery materials is increasing, and the requirements on the quality and performance consistency of products are becoming severe, so that the improvement of the performance of corresponding lithium battery material production equipment is promoted. As the production equipment which is relatively commonly used at present, the stability of the internal protective atmosphere of the atmosphere roller kiln can directly influence the sintering quality. For this reason, how to improve the stability of the protective atmosphere is a problem to be solved.

Disclosure of Invention

In order to overcome the defects in the prior art, the utility model provides a nitrogen atmosphere protection roller kiln.

The technical scheme adopted for solving the technical problems is as follows: the nitrogen atmosphere protection roller kiln comprises a roller kiln body, wherein a conveying roller group for conveying sagger and a heating device for heating are arranged in the roller kiln body, the roller kiln body is sequentially divided into a plurality of kiln segments, the kiln segments comprise but not limited to a heating kiln segment, a heat preservation kiln segment and a cooling kiln segment, and protective atmosphere devices are arranged in the kiln segments;

the protective atmosphere device comprises an air inlet air pipe and an atmosphere storage tank, wherein a plurality of groups of air inlet air pipes are arranged and are respectively and uniformly distributed on two sides of the transmission roller group, the air inlet air pipes are connected with the atmosphere storage tank through pipelines, each air inlet air pipe comprises an outer hollow sleeve pipe and an inner guide pipe, the outer hollow sleeve pipe is sleeved on the inner guide pipe, a conduction gap is reserved between the outer hollow sleeve pipe and the inner guide pipe, a plurality of groups of spiral guide grooves are arranged on the outer side surface of the inner guide pipe, and a plurality of groups of air outlet holes communicated with the conduction gap are formed in the outer hollow sleeve pipe.

Preferably, the air outlet holes are arranged at intervals along the length direction of the outer hollow sleeve and are respectively opposite to the spiral guide grooves.

Preferably, the axial direction of the air outlet hole is parallel to the conveying direction of the conveying roller set.

Preferably, the nitrogen atmosphere protection roller kiln further comprises a heat exchanger, an exhaust gas return air inlet is formed in the bottom of the cavity of the kiln section, the exhaust gas return air inlet is communicated with a first heat exchange flow passage of the heat exchanger through a pipeline, an atmosphere storage tank is communicated with an inlet of a second heat exchange flow passage of the heat exchanger through a pipeline, and an outlet of the second heat exchange flow passage is communicated with an air inlet pipe through a pipeline.

Preferably, the spiral guide grooves are circumferentially equidistantly spaced on the outer side surface of the inner catheter, and the circumferential spacing of adjacent spiral guide grooves is not smaller than the width of the spiral guide grooves.

Preferably, the pitch of the spiral guide groove is not smaller than the outer diameter of the inner catheter and not larger than three times the outer diameter of the inner catheter.

Preferably, the width of the conduction gap is smaller than the depth of the spiral guide groove.

The beneficial effects of the utility model are as follows: when the protective atmosphere is conveyed to the far end along the spiral guide groove and the conduction gap, the protective atmosphere can be synchronously heated until the temperature of the protective atmosphere is equal to that of the kiln Wen Xiangdeng, and the heat exchange and heating time of the protective atmosphere can be effectively prolonged through the rotational flow formed by the spiral guide groove, so that the temperature of the protective atmosphere is as close to the kiln temperature as possible when the protective atmosphere enters a kiln section, the condition that the temperature of the protective atmosphere is too large with the kiln temperature difference is avoided, local fluctuation of the kiln temperature is too large, and the stability of the protective atmosphere is improved.

Drawings

FIG. 1 is a schematic (partial) view of a kiln segment in an embodiment of the utility model;

FIG. 2 is a perspective view (partial) of an air intake duct according to an embodiment of the present utility model;

FIG. 3 is a schematic cross-sectional view of an air intake duct according to an embodiment of the present utility model;

FIG. 4 is an enlarged schematic view of FIG. 3 at A;

fig. 5 is a perspective view of an inner catheter in an embodiment of the present utility model.

In the figure, 10, kiln segments; 11. a transport roller group; 12. a heating device; 20. an air inlet pipe; 21. an outer hollow sleeve; 22. an air outlet hole; 23. an inner catheter; 24. a spiral guide groove; 25. and a conduction gap.

Detailed Description

The following describes the embodiments of the present utility model further with reference to the drawings. The description of these embodiments is provided to assist understanding of the present utility model, but is not intended to limit the present utility model. In addition, the technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

As shown in figures 1-5, the nitrogen atmosphere protection roller kiln provided by the utility model comprises a roller kiln body, wherein a conveying roller group 11 for conveying sagger and a heating device 12 for heating are arranged in the roller kiln body, the roller kiln body is sequentially divided into a plurality of kiln segments 10, the kiln segments 10 comprise but are not limited to a heating kiln segment 10, a heat preservation kiln segment 10 and a cooling kiln segment 10, and protective atmosphere devices are arranged in the kiln segments 10;

the protective atmosphere device comprises an air inlet air pipe 20 and an atmosphere storage tank, wherein the air inlet air pipe 20 is provided with a plurality of groups and is respectively and uniformly distributed on two sides of the transmission roller group 11, the air inlet air pipes 20 are vertically arranged on two sides of the transmission roller group at equal intervals, the air inlet air pipe 20 is connected with the atmosphere storage tank through pipelines, the air inlet air pipe 20 comprises an outer hollow sleeve 21 and an inner guide pipe 23, the outer hollow sleeve 21 is sleeved on the inner guide pipe 23, a conduction gap 25 is reserved between the outer hollow sleeve 21 and the inner guide pipe 23, a plurality of groups of spiral guide grooves 24 are arranged on the outer side surface of the inner guide pipe 23, a plurality of groups of air outlet holes 22 communicated with the conduction gap 25 are formed on the outer hollow sleeve 21, and after protective atmosphere in the atmosphere storage tank is input into the air inlet air pipe 20, rotational flow is formed along the spiral guide grooves 24 and through flow is formed along the axial direction of the conduction gap 25.

Specifically, because the air inlet pipe 20 is arranged in the kiln segment 10, the high temperature in the kiln segment 10 can be conducted to the air inlet pipe 20, when the protective atmosphere is conveyed to the far end along the spiral guide groove 24 and the conduction gap 25, the protective atmosphere can be heated up synchronously until the temperature of the protective atmosphere is equal to that of the kiln Wen Xiangdeng, the time of heat exchange and heating of the protective atmosphere can be effectively prolonged through the rotational flow formed by the spiral guide groove 24, and the temperature of the protective atmosphere is as close to the kiln temperature as possible when the protective atmosphere enters the kiln segment 10, so that the temperature of the protective atmosphere and the kiln temperature difference are prevented from being too large, the local kiln temperature fluctuation is too large, the stability of the protective atmosphere is improved, the rotational flow of the protective atmosphere can disturb the protective atmosphere of the through flow, the uniformity of heat exchange and heating of the protective atmosphere is further improved, and meanwhile, the resistance of the rotational flow is prevented from being too large.

Further, in order to improve the uniformity of the protective atmosphere diffusion, the air outlet holes 22 are arranged at intervals along the length direction of the outer hollow sleeve 21 and are respectively opposite to the spiral guide grooves 24, namely, the air outlet holes 22 are arranged at the outer side of the air inlet air pipe 20 at intervals along the vertical direction, the axial direction of the air outlet holes 22 is parallel to the conveying direction of the conveying roller set 11, the protective atmosphere can uniformly diffuse to the periphery along the side wall of the kiln segment 10 in the vertical direction, and a large amount of protective atmosphere is prevented from being injected simultaneously, so that overlarge fluctuation is generated in the kiln body.

Further, in order to make the temperature of the protective atmosphere approach to the kiln temperature as much as possible before entering the kiln segment 10, the nitrogen atmosphere protective roller kiln further comprises a heat exchanger, an exhaust gas return air inlet is arranged at the bottom of a cavity of the kiln segment 10, the exhaust gas return air inlet is communicated with a first heat exchange flow channel of the heat exchanger through a pipeline, an atmosphere storage tank is communicated with an inlet of a second heat exchange flow channel of the heat exchanger through a pipeline, an outlet of the second heat exchange flow channel is communicated with an air inlet air pipe 20 through a pipeline, and high-temperature exhaust gas and the protective atmosphere are preheated through the high-temperature exhaust gas when flowing alternately in the first heat exchange flow channel and the second heat exchange flow channel.

Further, the spiral guide grooves 24 are circumferentially equally spaced on the outer side face of the inner guide pipe 23, and the circumferential spacing of adjacent spiral guide grooves 24 is not smaller than the width of the spiral guide grooves 24; wherein, in order to avoid that the spiral resistance is too large due to too small pitch of the spiral guide groove 24, the pitch of the spiral guide groove 24 is not smaller than the outer diameter of the inner guide pipe 23 and is not larger than three times the outer diameter of the inner guide pipe 23, in this embodiment, the pitch of the spiral guide groove 24 is twice the outer diameter of the inner guide pipe 23, and the width of the conduction gap 25 is smaller than the depth of the spiral guide groove 24.

The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings, but the present utility model is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the utility model, and yet fall within the scope of the utility model.

Claims

1. The nitrogen atmosphere protection roller kiln comprises a roller kiln body, and is characterized in that a conveying roller set (11) for conveying sagger and a heating device (12) for heating are arranged in the roller kiln body, the roller kiln body is sequentially divided into a plurality of kiln segments (10), the kiln segments (10) comprise but are not limited to a heating kiln segment (10), a heat preservation kiln segment (10) and a cooling kiln segment (10), and protective atmosphere devices are arranged in the kiln segments (10);

the protective atmosphere device comprises an air inlet air pipe (20) and an atmosphere storage tank, wherein a plurality of groups of air inlet air pipes (20) are arranged and are respectively and uniformly distributed on two sides of a transmission roller group (11), the air inlet air pipes (20) are connected with the atmosphere storage tank through pipelines, each air inlet air pipe (20) comprises an outer hollow sleeve (21) and an inner guide pipe (23), the outer hollow sleeve (21) is sleeved on the inner guide pipe (23), a conduction gap (25) is reserved between the outer hollow sleeve (21) and the inner guide pipe (23), a plurality of groups of spiral guide grooves (24) are arranged on the outer side face of the inner guide pipe (23), and air outlet holes (22) of the plurality of groups of communication conduction gaps (25) are formed in the outer hollow sleeve (21).

2. A nitrogen atmosphere protection roller kiln according to claim 1, characterized in that the air outlet holes (22) are arranged at intervals along the length direction of the outer hollow sleeve (21) and are respectively opposite to the spiral guide grooves (24).

3. A nitrogen atmosphere protection roller kiln according to claim 1, characterized in that the axial direction of the air outlet holes (22) is parallel to the transport direction of the transport roller set (11).

4. The nitrogen atmosphere protection roller kiln according to claim 1, further comprising a heat exchanger, wherein the bottom of the kiln segment (10) is provided with an exhaust gas return inlet, the exhaust gas return inlet is communicated with a first heat exchange flow passage of the heat exchanger through a pipeline, the atmosphere storage tank is communicated with an inlet of a second heat exchange flow passage of the heat exchanger through a pipeline, and an outlet of the second heat exchange flow passage is communicated with an air inlet air pipe (20) through a pipeline.

5. A nitrogen atmosphere protection roller kiln according to claim 1, characterized in that the spiral guide grooves (24) are circumferentially equally spaced on the outer side of the inner duct (23) and that the circumferential spacing of adjacent spiral guide grooves (24) is not smaller than the width of the spiral guide grooves (24).

6. A nitrogen atmosphere protection roller kiln according to claim 1, characterized in that the pitch of the helical guide groove (24) is not smaller than the outer diameter of the inner duct (23) and not larger than three times the outer diameter of the inner duct (23).

7. A nitrogen atmosphere protection roller kiln according to claim 1, characterized in that the width of the conduction gap (25) is smaller than the depth of the spiral guide slot (24).