CN103575095B - Cascading type rotary kiln - Google Patents

Abstract

The invention discloses a waterfall type rotary kiln, which comprises a rotary kiln support, on which a rotary kiln cylinder is rotatably connected. Equipped with a rotary kiln power device that drives the rotation of the rotary kiln cylinder, the inner wall of the rotary kiln cylinder is equipped with at least three material turning cylinders extending along the axial direction of the rotary kiln cylinder and distributed along its cross-section. The kiln also includes a feed sleeve and a discharge sleeve. The front and rear ends of the rotary kiln shell are respectively rotatably connected to the feed sleeve and the discharge sleeve. The feed sleeve is equipped with a The rotary kiln feed pipe of the cavity, the bottom of the discharge sleeve is provided with a rotary kiln discharge pipe, and the rear end of the discharge sleeve is also equipped with a flamethrower that sprays the fire end into the rotary kiln body, and the feed sleeve The top is equipped with an exhaust fan. The invention has the advantages of uniform heating of the ceramsite and effective avoidance of damage to the ceramsite.

Description

A waterfall rotary kiln

technical field

The invention relates to a cascading rotary kiln.

Background technique

Ceramsite is widely used in the construction and building materials industry due to its advantages such as reasonable particle size distribution, small bulk density, low thermal conductivity, low water absorption, high refractoriness, good thermal insulation effect, and acid corrosion resistance.

From the perspective of the construction industry, ceramsite is a new type of wall material that has developed rapidly after hollow bricks and aerated concrete blocks in recent years. The frame building of high-rise buildings needs ceramsite as a filling material, so that the weight of the building can be reduced by more than 30%. At present, the preparation of ceramsite mainly uses coal, coke and heavy oil as fuel and adopts sintering kiln method or rotary kiln method to prepare fly ash ceramsite. Since ceramsite is formed by sintering method in the kiln, its forming quality is poor. The grain size is uneven and the water content is high, resulting in a decline in product quality.

The existing rotary kiln used to prepare ceramsite by the rotary kiln method has a structure including a rotating rotary kiln body, and a spirally arranged stirring rod or stirring teeth are installed on the inner wall of the rotary kiln body. When the ceramsite is used, the overturning direction of the ceramsite is limited, so there is a phenomenon that the ceramsite is heated unevenly, and because the stirring rod or the stirring teeth are in rigid contact with the ceramsite during the process of overturning the ceramsite, the ceramsite is in the process of turning. prone to breakage.

Contents of the invention

The technical problem to be solved by the present invention is to provide a cascading rotary kiln in which the ceramsite is evenly heated and the ceramsite is not easily broken.

In order to solve the above technical problems, the waterfall type rotary kiln provided includes a rotary kiln support, and its structural characteristics are: the rotary kiln support is rotatably connected with a rotary kiln shell, and the rotary kiln shell is set from front to back and tilted downward. The rotary kiln support is also equipped with a rotary kiln power device that drives the rotary kiln cylinder to rotate. The inner wall of the rotary kiln cylinder is equipped with at least three material turning cylinders extending axially along the rotary kiln cylinder and distributed along its cross section. The waterfall rotary kiln also includes a feed sleeve and a discharge sleeve, the front and rear ends of the rotary kiln body are respectively connected to the feed sleeve and the discharge sleeve in rotation, and the feed sleeve is equipped with The rotary kiln feed pipe extending into the inner cavity of the rotary kiln cylinder, the bottom of the discharge sleeve is provided with a rotary kiln discharge pipe, and the rear end of the discharge sleeve is also equipped with a spray nozzle that sprays into the rotary kiln cylinder. Firearm, the top of the feed sleeve is equipped with an exhaust fan.

The support of the rotary kiln is equipped with at least two supporting wheel trains arranged at intervals before and after, each supporting wheel train includes two oppositely arranged supporting wheels, the rotary kiln cylinder is located above the middle of the two supporting wheels, and the rotary kiln power device It includes the drive motor of the rotary kiln, the drive gear is installed on the power output shaft of the drive motor of the rotary kiln, and the driven ring gear meshing with the drive gear is installed on the cylinder body of the rotary kiln.

Each material turning cylinder is formed by splicing multiple sections of closed ends of the cylinder along the axial direction of the rotary kiln cylinder. The rotary kiln cylinder is equipped with multiple thermocouples that extend into the cylinders of each section of the material turning cylinder.

The cross-section of the material turning cylinder is semicircular and the outer wall surface exposed in the rotary kiln cylinder is arc-shaped.

After adopting the above structure, the molded ceramsite enters the rotary kiln shell through the feed pipe of the rotary kiln. Under the action, the heat flows forward from the rear end of the rotary kiln shell, and at the same time dries the formed ceramsite. The ceramsite is driven by the rotating rotary kiln shell, and the material turning cylinder can rotate with the rotary kiln shell. Use the ceramsite stirrer located at the bottom of the inner cavity of the rotary kiln, and the ceramsite will roll smoothly during the turning process, thereby effectively avoiding the cracking phenomenon caused by hard agitation, and the agitated ceramsite will form a waterfall under the lifting action of the material turning cylinder The shape falls, and the ceramsite is cooled in all directions when the hot air flows.

In summary, the present invention changes the mode of rigidly agitating the ceramsite, and uses a material turning cylinder with a smooth transition to overturn the ceramsite, which has the advantages of uniform heating of the ceramsite and effective avoidance of damage to the ceramsite.

Description of drawings

Below in conjunction with accompanying drawing, the present invention will be further described:

Fig. 1 is the structural representation of a kind of preferred embodiment of the present invention;

Fig. 2 is a sectional view along line B-B in Fig. 1 .

Detailed ways

The waterfall type rotary kiln shown in Figure 1, described waterfall type rotary kiln 7 comprises a rotary kiln support 71 and a rotary kiln shell 72 that is rotatably connected on the rotary kiln support 71, and on the rotary kiln support 71 is also A rotary kiln power device is installed to drive the rotary kiln cylinder 72 to rotate. The rotary kiln support 71 is equipped with at least two supporting wheel trains arranged at intervals before and after. Each supporting wheel train includes two oppositely arranged supporting wheels. The rotary kiln barrel The body 72 is located above the middle of the two support wheels, and the rotary kiln body 72 is slightly inclined downward from the front to the rear, that is, the height of the rear end of the rotary sleeve body 72 is slightly lower than the height of its front end, which is convenient for the ceramsite to run backwards and rotate The kiln power device includes a rotary kiln drive motor 711, the drive gear is installed on the power output shaft of the rotary kiln drive motor 711, and the driven ring gear meshed with the drive gear is installed on the rotary kiln cylinder body 72, when the rotary kiln drive motor 711 drives the drive gear When rotating, the rotary kiln shell 72 rotates, and the inner wall of the rotary kiln shell 72 is equipped with at least three material turning cylinders 79 extending axially along the rotary kiln shell 72 and distributed along its cross section. The cross section of the material turning cylinder 79 is As shown in Figure 2, it is semicircular, and the surface of its outer wall is arc-shaped. The above-mentioned outer wall refers to the outer wall of the section extending toward the inner cavity of the rotary kiln shell 72, which is conducive to the drying process of ceramsite. During the drying process, the ceramsite rolls smoothly to prevent the ceramsite from being damaged due to hard bumps, and the setting of the material turning cylinder 79 enables the formed ceramsite to flow down smoothly in a waterfall during the turbulence process, thereby completely ceramsite Azimuth and three-dimensional drying.

Each material turning cylinder 79 shown in Fig. 1 is composed of multi-section cylinders with both ends closed along the axial direction of the rotary kiln cylinder. A thermocouple measures the temperature in the kiln by measuring the temperature in the material turning cylinder 79, so as to accurately control the temperature in the kiln. The waterfall type rotary kiln also includes a feed sleeve 73 and a discharge sleeve 74. The sleeve 73 and the discharge sleeve 74 are respectively supported by supports, and the front and rear ends of the rotary kiln shell 72 are respectively rotatably connected to the feed sleeve 73 and the discharge sleeve 74, and the feed sleeve 73 is equipped with The rotary kiln feed pipe 75 extending into the inner cavity of the rotary kiln shell 72, the advantage of the rotary sleeve feed pipe 75 extending into the rotary kiln shell 72 is that it can effectively drive the ceramsite into the rotary kiln shell 72 and prevent the ceramsite from piled up. At or into the rotary connection between the rotary kiln shell 72 and the feed sleeve 73, the rotation stability of the rotary kiln shell 72 is ensured. The bottom of the discharge sleeve 74 is provided with a rotary kiln discharge pipe 76, and the discharge sleeve The rear end portion of 74 is also equipped with the flame injector 77 that fire-spraying end is sprayed in the rotary kiln shell 72, and the top of feeding sleeve 73 is equipped with blower fan 78. When the spray flame of the flame injector 77 is sprayed into the rotary kiln shell 72 from the discharge sleeve 74, the heat flows into the rotary kiln shell 72, and the hot air is directed to the feed sleeve 73 through the drainage effect of the exhaust fan 78. Flow, so as to effectively dry the ceramsite.

As shown in Figure 1, the wall of the rotary kiln cylinder 72 is composed of three layers from the outside to the inside: the outer wall, the inner wall and the insulation layer, so that heat loss can be effectively reduced, and the heat absorption on the surface of the material turning cylinder 72 can also be The rolled ceramsite is dried to maximize the use of heat.

The above is the specific structural form of the present invention, and the present invention is not limited by the above-mentioned embodiments. For those skilled in the art, equivalent changes and parts replacement based on the specific structure of the present invention are all within the protection scope of the present invention.

Claims (3)

1. a waterfall falls formula rotary kiln, comprise rotary kiln bearing (71), rotary kiln bearing (71) is rotatably connected to cylinder of rotary kiln (72), the rotary kiln power set driving cylinder of rotary kiln (72) to rotate rotary kiln bearing (71) are also equipped with, it is characterized in that: cylinder of rotary kiln (72) goes to rear-inclined to arrange certainly downwards, the inwall of cylinder of rotary kiln (72) is equipped with and axially extends and at least three the material turning cylinders (79) be periphery along its cross section along cylinder of rotary kiln (72), the waterfall formula rotary kiln that falls also comprises feed sleeve (73) and discharging sleeve (74), the rear ends of described cylinder of rotary kiln (72) is rotatably connected on feed sleeve (73) and discharging sleeve (74) respectively, feed sleeve (73) and discharging sleeve (74) are respectively by seat supports, the rotary kiln feed pipe (75) stretching into cylinder of rotary kiln (72) inner chamber feed sleeve (73) is equipped with, the bottom of discharging sleeve (74) is provided with rotary kiln discharge nozzle (76), the rearward end of discharging sleeve (74) is also equipped with spitfire end and sprays to flame projector (77) in cylinder of rotary kiln (72), exhaust blower (78) is equipped with at the top of feed sleeve (73), each material turning cylinder (79) is axially spliced along cylinder of rotary kiln (72) by the cylinder of multistage closed at both ends, the multiple thermocouples (714) in the cylinder stretching into material turning cylinder (79) each section respectively cylinder of rotary kiln (72) are equipped with.

2. waterfall according to claim 1 falls formula rotary kiln, it is characterized in that: described rotary kiln bearing (71) is equipped with the supporting wheel systems that at least two time intervals are arranged, each supporting wheel systems comprises two support wheels be oppositely arranged, cylinder of rotary kiln (72) is positioned at the middle upper part of two support wheels, rotary kiln power set comprise rotary kiln drive motors (711), the power output shaft of rotary kiln drive motors (711) is equipped with driving gear (712), cylinder of rotary kiln (72) is equipped with the driven gear ring (713) engaged with driving gear.

3. waterfall according to claim 1 and 2 falls formula rotary kiln, it is characterized in that: the cross section semicircular in shape of described material turning cylinder (79) and the outer wall surface of expression in cylinder of rotary kiln (72) is arc-shaped.