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CN-122015483-A - Tunnel kiln drying system for firing green bricks

CN122015483ACN 122015483 ACN122015483 ACN 122015483ACN-122015483-A

Abstract

The invention discloses a tunnel kiln drying system for firing green bricks, which belongs to the technical field of green brick production, wherein a drying chamber comprises a base layer, side barriers and a top layer, a transportation unit is used for driving the green bricks to advance, a hot air flow circulation unit comprises a conveying part and a recovery part, the conveying part is connected with the top layer and is used for conveying hot air flow into the drying chamber, the recovery part is arranged in the base layer and is used for recovering the hot air flow, the flow guiding unit is arranged in the top layer and comprises a first flow guiding pipe, a second flow guiding pipe and a rotary swinging part, and the rotary swinging part is arranged in the top layer and is used for driving the first flow guiding pipe to rotate around an axis and simultaneously driving the second flow guiding pipe to swing reciprocally around a rotary connecting point. The first honeycomb duct is driven to rotate around the axis through the rotary swinging part, and the second honeycomb duct is driven to swing back and forth around the rotary connecting point, so that the problem of uneven air flow distribution in the drying chamber in the existing tunnel kiln drying system is solved.

Inventors

  • CHEN SHENGYAN
  • HUANG CHONGYANG
  • LI MING

Assignees

  • 广西容县顺垚仿古建陶有限公司

Dates

Publication Date
20260512
Application Date
20260324

Claims (9)

  1. 1. A tunnel kiln drying system for firing green bricks, comprising: the drying chamber (1), the drying chamber (1) comprises a base layer (11), side fences (12) and a top layer (13), the side fences (12) are vertically arranged on two sides of the base layer (11) respectively, and the top of the side fences (12) is provided with the top layer (13); The conveying unit is arranged on the base layer (11) and is used for driving the green bricks to advance; The hot air circulation unit comprises a conveying part and a recovery part (2), a first hot air circulation cavity (131) is formed in the top layer (13), a plurality of first through holes communicated with the interior of the drying chamber (1) are formed in the inner side wall of the first hot air circulation cavity (131), the conveying part is connected with the top layer (13) and used for conveying hot air into the drying chamber (1), and the recovery part (2) is arranged in the base layer (11) and used for recovering the hot air; The air guide unit (3), air guide unit (3) is installed in top layer (13), air guide unit (3) include first honeycomb duct (31), second honeycomb duct (32) and rotatory swing portion (33), first honeycomb duct (31) are installed in first through-hole, second honeycomb duct (32) are located drying chamber (1), and the one end of second honeycomb duct (32) is rotated with the one end of first honeycomb duct (31) and is connected and communicate, rotatory swing portion (33) are installed in top layer (13) for drive first honeycomb duct (31) and rotate around the axis, drive second honeycomb duct (32) simultaneously and reciprocate the swing around rotation tie point.
  2. 2. The tunnel kiln drying system for firing green bricks according to claim 1, wherein the rotary swinging part (33) comprises a rotary rod (331), a driving blade (332), a support frame (333), a guide cylinder (334), a sleeve (336), a connecting rod (337), a roller (338) and a driving rod (339), the top layer (13) is provided with a second hot air circulation cavity (132), the second hot air circulation cavity (132) is connected with a hot air circulation unit through a pipeline (4), the side wall of the second hot air circulation cavity (132) is uniformly provided with a plurality of second through holes communicated with the first hot air circulation cavity (131), the driving rod (339) is rotatably installed in the second through holes, two ends of the driving rod (339) are respectively positioned in the first hot air circulation cavity (131) and the second hot air circulation cavity (132), the driving blade (332) is installed on one end of the driving rod (131), the support frame (333) is installed on one end of the driving rod (132), and the driving rod (333) is connected with the first support frame (31). The utility model provides a plurality of guiding tube (334) are installed on top layer (13) diapire, and guiding tube (334) and first honeycomb duct (31) coaxial line, guide slot (335) have been seted up on guiding tube (334) inside wall, guide slot (335) are the wave, spout (3310) have been seted up on first honeycomb duct (31) lateral wall, sleeve (336) cup joint on first honeycomb duct (31) lateral wall, install the slider on sleeve (336) inside wall, slider and spout (3310) sliding connection, a plurality of the one end and sleeve (336) lateral wall of actuating lever (339) are connected, the other end at actuating lever (339) is installed to gyro wheel (338), gyro wheel (338) are located guide slot (335), follow guide slot (335) rotatory advancing, the one end and the rotation of arbitrary actuating lever (339) of connecting rod (337) are connected, and the other end is rotated with the lateral wall of second honeycomb duct (32).
  3. 3. The tunnel kiln drying system for firing green bricks according to claim 2, wherein the supporting frame (333) comprises supporting rods (3332) and an adapter plate (3331), one surface of the adapter plate (3331) is connected with one end of a driving rod (339) located in the first hot air circulation cavity (131), one end of each supporting rod (3332) is vertically installed on the other side of the adapter plate (3331), the supporting rods (3332) are distributed in a circumferential array, and the other end of each supporting rod (3332) is connected with the end of the corresponding first guide pipe (31).
  4. 4. A tunnel kiln drying system for firing green bricks according to claim 1, characterized in that the second flow guide tube (32) is rotatably mounted with helical blades (5).
  5. 5. Tunnel kiln drying system for firing green bricks according to claim 1, characterized in that the recovery section (2) comprises an exhaust fan (22) and an exhaust duct (21) arranged in the base layer (11), wherein an installation chamber is arranged in the base layer (11), the exhaust fan (22) is arranged in the installation chamber, the exhaust ducts (21) are connected with the installation chamber, and the installation chamber is connected with the conveying section through a pipeline (4).
  6. 6. A tunnel kiln drying system for firing green bricks according to claim 2, characterized in that the blade mounting angle of the driving blade (332) is 20-30 degrees.
  7. 7. Tunnel kiln drying system for firing green bricks according to claim 1, characterized in that the side dams (12) are provided with a plurality of deflector units (3).
  8. 8. A tunnel kiln drying system for firing green bricks according to claim 2, wherein the second draft tube (32) rotates in the range of 0-45 degrees.
  9. 9. A tunnel kiln drying system for firing green bricks according to claim 2, characterized in that the top end of the first draft tube (31) is flush with or lower than the inner bottom wall of the first hot air circulation cavity (131).

Description

Tunnel kiln drying system for firing green bricks Technical Field The invention belongs to the technical field of green brick production, and particularly relates to a tunnel kiln drying system for firing green bricks. Background The tunnel kiln is used as modern thermal equipment, and has the advantages of continuous operation, high thermal efficiency, short production period and the like, so that the tunnel kiln gradually replaces the traditional intermittent kiln and is widely applied to large-scale production of green bricks and novel wall materials. In actual production, the drying link of the green bricks has a decisive influence on the quality of the final products, and a plurality of improper dryness is extremely easy to cause cracking and deformation of the green bricks and even influence the smooth proceeding of the subsequent roasting process. At present, in a mobile tunnel kiln or a one-time stacking and burning tunnel kiln process, a mode of directly drying green bricks by hot air is generally adopted. The basic principle is that the waste heat generated in the roasting section or the heat medium generated in the hot blast stove is introduced into the drying chamber through the air supply pipeline and directly blown to the surface of the green brick, so that the moisture of the green brick is evaporated. However, practice has shown that this way of blowing hot air directly against the green brick surface presents a significant problem of drying non-uniformity. When the hot air is directly blown, if the air temperature is too high or the air speed is too high, the moisture on the surface of the blank body is evaporated too fast, and the moisture migration in the blank body is delayed, so that the surface is inconsistent with the internal shrinkage to generate stress difference, and further the blank body is caused to generate a crack or a surface fry. The defect caused by mismatching of the drying system and the raw material performance is one of the main reasons for the high rate of the damaged green bricks for a long time. Aiming at the problem of stress cracking caused by direct blowing of hot air, the related technical fields are improved. For example, chinese patent No. 202410417293 discloses a drying blowing drum structure, which drives a built-in helical blade to rotate by hot air, so that the blown hot air flows in a helical shape, so as to make the hot air act on the surface of the green brick more gently, thereby relieving stress concentration caused by direct impact of air flow. According to the scheme, the direct-current wind is changed into rotational wind, so that the problem of overlarge single-point impact force is solved to a certain extent. However, this solution still has limitations. The improvement focus is on optimizing the air outlet form, and the systematic problem of air flow distribution in the drying chamber is not fundamentally solved. In particular, the spiral hot gas flow also has floating characteristics, is easily accumulated at the top of the drying chamber and is rapidly lost, and causes heat to accumulate in the upper space. The green bricks close to the air supply port or the surface layer of the green brick stack are directly blown by hot air, and the green bricks positioned in the inner part, the middle lower layer or the far away from the air supply port of the green brick stack are not fully dried due to insufficient heat exchange, so that the residual moisture is too high. When the green bricks with excessive residual moisture enter a high-temperature roasting section, internal moisture is rapidly vaporized, and embossed bricks and black bricks are extremely easy to form or hidden cracks are generated in the products in a reducing atmosphere, so that the quality of the finished products of the green bricks and the mechanical properties after firing are seriously influenced. Thus, there is a need for a tunnel kiln drying system for firing green bricks. Disclosure of Invention The invention aims to provide a tunnel kiln drying system for firing green bricks, which drives a first guide pipe to rotate around an axis through a rotary swinging part and drives a second guide pipe to swing reciprocally around a rotary connection point, so that the problem of uneven air flow distribution in a drying chamber in the existing tunnel kiln drying system is solved. The specific technical scheme is as follows: A tunnel kiln drying system for firing green bricks, comprising: The drying chamber comprises a base layer, side fences and a top layer, wherein the side fences are respectively vertically arranged at two sides of the base layer, and the top of the side fences is provided with the top layer; The conveying unit is arranged on the base layer and is used for driving the green bricks to advance; The hot air circulation unit comprises a conveying part and a recovery part, a first hot air circulation cavity is formed in the top layer, a plurality of first through holes c