A combustion-supporting air inlet structure for a rotary kiln

Abstract

The present invention belongs to the technical field of rotary kiln and discloses a combustion-supporting air inlet structure of a rotary kiln, and its technical key points are: it comprises a kiln head seat, a feeding air duct is slidably installed in the middle of the kiln head seat, a plurality of groups of combustion-supporting air ducts are fixedly installed on the surface of the kiln head seat, the combustion-supporting air duct is located at one end of the inner cavity of the rotary kiln and is rotatably installed with an air outlet, the feeding air duct is connected with a telescopic component, a positioning mechanism is arranged on the surface of the combustion-supporting air duct, the positioning mechanism comprises a rotating component and a driving component, the feeding air duct is located at one end of the inner cavity of the rotary kiln and is provided with a material guiding mechanism, the material guiding mechanism comprises a material guiding plate, a supporting component and an adjusting component, by arranging the rotating component and the driving component to cooperate with each other, the air outlet can be controlled to rotate continuously at the end of the combustion-supporting air duct, and then the blowing direction of the combustion-supporting air can be continuously changed, so as to facilitate all-round blowing treatment of the inner cavity of the rotary kiln and effectively improve the combustion efficiency of the material in the inner cavity of the rotary kiln.

Description

Technical Field

[0001] The invention relates to the technical field of rotary kilns, in particular to a combustion-supporting air inlet structure of a rotary kiln. Background Art

[0002] A rotary kiln is a rotary calcining kiln (commonly known as a rotary kiln), which belongs to the category of building materials equipment. Rotary kilns can be divided into cement kilns, metallurgical chemical kilns and lime kilns according to the materials they process. The reduction roasting process of a rotary kiln requires the use of a fan to blow air from the air duct to produce enough carbon monoxide for reduction.

[0003] The existing air inlet structure is usually directly fixed on the rotary kiln equipment. The blowing direction in the rotary kiln cannot be adjusted, and the inner cavity of the rotary kiln cannot be blown in all directions, and the materials in the inner cavity of the rotary kiln cannot be fully burned, resulting in poor use effect. In addition, when blowing coal powder into the inner cavity of the rotary kiln, the blowing intensity of the coal powder cannot be adjusted, and the blowing range of the coal powder is relatively fixed, and it is impossible to control the coal powder to be fully burned in the inner cavity of the rotary kiln. Summary of the invention

[0004] The object of the present invention is to provide a combustion-supporting air inlet structure for a rotary kiln to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A combustion-supporting air inlet structure for a rotary kiln comprises a kiln head seat, a feed air duct is slidably mounted in the middle of the kiln head seat, a plurality of groups of combustion-supporting air ducts are fixedly mounted on the surface of the kiln head seat, the plurality of groups of combustion-supporting air ducts are distributed in a circular manner with equal spacing around the feed air duct, an air outlet is rotatably mounted on one end of the combustion-supporting air duct located in an inner cavity of the rotary kiln, the air outlet is arranged in an inclined structure, a telescopic assembly is connected to the feed air duct, the telescopic assembly is used to control the feed air duct to reciprocate on the surface of the kiln head seat along the axis of the rotary kiln, a positioning mechanism cooperating with the air outlet is arranged on the surface of the combustion-supporting air duct, the positioning mechanism comprises a rotating assembly and a driving assembly, the rotating assembly is located on the surface of the combustion-supporting air duct and is connected to the air outlet The driving assembly is connected to the rotating assembly. When the feeding air duct moves back and forth, the driving assembly controls the outlet of the air duct to rotate synchronously at the end of the combustion-supporting air duct by cooperating with the rotating assembly. The feeding air duct is located at one end of the inner cavity of the rotary kiln and is provided with a material guiding mechanism. The material guiding mechanism includes a material guiding plate, a supporting assembly and an adjusting assembly. The material guiding plates are provided with multiple groups and are rotatably installed at the end of the feeding air duct. The multiple groups of material guiding plates are distributed in a ring shape. The supporting assembly is located on the surface of the feeding air duct and is connected to the material guiding plates. The adjusting assembly is connected to the supporting assembly. When the feeding air duct moves back and forth, the adjusting assembly controls the multiple groups of material guiding plates to swing synchronously back and forth at the end of the feeding air duct by cooperating with the supporting assembly.

[0007] As a further solution of the present invention: the telescopic assembly includes a base, a cross bar is fixedly installed on the bottom wall of the feeding air duct, a strip-shaped limiting groove is provided on the surface of the cross bar, a motor is fixedly installed on the surface of the base, a control panel located below the cross bar is fixedly installed on the output shaft of the motor, a limiting column is provided on the surface of the control panel at a position deviating from the center of the circle, and the limiting column is inserted into the limiting groove.

[0008] As a further solution of the present invention: the rotating component includes an annular gear ring arranged on the surface of the air outlet pipe, and two groups of relatively distributed fixed plates are fixedly installed on the surface of the combustion-supporting air duct. A transmission shaft is installed on the two groups of fixed plates for rotation together, and a transmission gear plate is fixedly installed on the surface of the transmission shaft, and the transmission gear plate is meshingly connected with the gear ring.

[0009] As a further solution of the present invention: the driving assembly includes a plurality of groups of first side plates that are opposite to each other and fixedly installed on the side wall of the kiln head seat, the plurality of groups of first side plates that are opposite to each other are distributed in a ring around the feeding air duct, the side wall of the kiln head seat has a plurality of groups of second side plates that are opposite to each other, the two oppositely distributed groups of first side plates are jointly rotatably installed with a first rotating column, the two oppositely distributed groups of second side plates are jointly rotatably installed with a second rotating column, a fixed toothed disc is fixedly installed on the surface of the first rotating column, a rack that is meshed with the fixed toothed disc is provided on the surface of the feeding air duct, synchronous discs are respectively fixedly installed on the surfaces of the first rotating column and the second rotating column, the two groups of synchronous discs are jointly connected with a synchronous belt, an active helical toothed disc is fixedly installed on the surface of the second rotating column, a driven helical toothed disc is fixedly installed on one end of the transmission shaft facing the second rotating column, and the driven helical toothed disc is meshed with the active helical toothed disc.

[0010] As a further solution of the present invention: the support assembly includes a control ring which is sleeved on the surface of the feeding air duct, and a plurality of guide grooves distributed in an annular shape are provided on the surface of the feeding air duct. A sliding block is fixedly installed on the inner wall of the control ring, and the sliding block extends through the guide groove to the inner cavity of the feeding air duct. A push-pull rod is rotatably installed on the side wall of the sliding block, and the end of the push-pull rod away from the sliding block is rotatably connected to the guide plate.

[0011] As a further solution of the present invention: the adjustment component includes multiple groups of pulling springs fixedly installed on the side wall of the kiln head seat, the telescopic end of the pulling spring is connected to the side wall of the control ring, and an extrusion spring is fixedly installed in the guide groove, and the telescopic end of the extrusion spring is connected to the sliding block.

[0012] As a further solution of the present invention: the pulling spring, the extrusion spring and the material guide plate are all made of high temperature resistant materials.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: by setting the rotating assembly and the driving assembly to cooperate with each other, the outlet of the air pipe can be controlled to rotate continuously at the end of the combustion-supporting air pipe, and then the blowing direction of the combustion-supporting air can be continuously changed, so as to facilitate the all-round blowing treatment of the inner cavity of the rotary kiln, and effectively improve the combustion efficiency of the materials in the inner cavity of the rotary kiln. The problem that the inner cavity of the rotary kiln cannot be blown in all directions and the use effect is poor is solved. By setting the supporting assembly and the adjusting assembly to cooperate with each other, the reciprocating swing of multiple groups of guide plates can be conveniently controlled at the end of the feeding air pipe, and then the opening size of the feeding air pipe can be adjusted, so that the coal powder can be blown into the inner cavity of the rotary kiln in all directions. The problem that the blowing range of the current coal powder is relatively fixed and the coal powder cannot be controlled to be fully burned in the inner cavity of the rotary kiln is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the three-dimensional structure of a rotary kiln combustion-supporting air inlet structure provided in an embodiment of the present invention;

[0015] Figure 2 for Figure 1 A is a schematic diagram of the enlarged structure of the middle part;

[0016] Figure 3 It is a schematic diagram of the main structure of a rotary kiln combustion-supporting air inlet structure provided in an embodiment of the present invention;

[0017] Figure 4 for Figure 3 A schematic diagram of the enlarged structure of B;

[0018] Figure 5 A schematic diagram of a transmission shaft and its connection structure in a rotary kiln combustion-supporting air inlet structure provided in an embodiment of the present invention;

[0019] Figure 6 The present invention provides a schematic diagram of a control panel and its connection structure in a rotary kiln combustion-supporting air inlet structure.

[0020] Among them: 1-kiln head seat, 2-feeding air duct, 3-combustion air duct, 31-air outlet, 4-telescopic component, 41-base, 42-motor, 43-cross bar, 44-limiting groove, 45-control panel, 46-limiting column, 5-positioning mechanism, 51-rotating component, 511-gear ring, 512-fixed plate, 513-transmission shaft, 514-transmission gear disc, 52-driving component, 521-first side plate, 522-second rotating column , 523-fixed gear plate, 524-rack, 525-second side plate, 526-first rotating column, 527-synchronizing plate, 528-synchronizing belt, 529-active helical gear plate, 520-driven helical gear plate, 6-material guiding mechanism, 61-material guiding plate, 62-supporting assembly, 621-control ring, 622-guide groove, 623-sliding block, 624-push-pull rod, 63-adjusting assembly, 631-pull spring, 632-extrusion spring. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0022] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0023] like Figure 1 , Figure 3 , Figure 4As shown, it is a structural diagram of a combustion-supporting air inlet structure of a rotary kiln provided by an embodiment of the present invention, comprising a kiln head seat 1, a feed air duct 2 is slidably installed in the middle of the kiln head seat 1, a plurality of groups of combustion-supporting air ducts 3 are fixedly installed on the surface of the kiln head seat, and the plurality of groups of combustion-supporting air ducts 3 are distributed in a ring shape with equal intervals around the feed air duct 2, the combustion-supporting air duct 3 is located at one end of the inner cavity of the rotary kiln and is rotatably installed with an air outlet port 31, and the air outlet port 31 is set to an inclined structure, the feed air duct 2 is connected with a telescopic component 4, and the telescopic component 4 is used to control the feed air duct 2 to reciprocate on the surface of the kiln head seat 1 along the axis direction of the rotary kiln, and a positioning mechanism 5 that cooperates with the air outlet port 31 is set on the surface of the combustion-supporting air duct 3, and the positioning mechanism 5 includes a rotating component 51 and a driving component 52, and the rotating component 51 is located on the surface of the combustion-supporting air duct 3 and is aligned with the air outlet port 31 The driving assembly 52 is connected to the rotating assembly 51. When the feeding air duct 2 moves back and forth, the driving assembly 52 controls the air outlet 31 to rotate synchronously at the end of the combustion-supporting air duct 3 by cooperating with the rotating assembly 51. The feeding air duct 2 is located at one end of the inner cavity of the rotary kiln and is provided with a material guiding mechanism 6. The material guiding mechanism 6 includes a material guiding plate 61, a supporting assembly 62 and an adjusting assembly 63. The material guiding plates 61 are provided with multiple groups and are rotatably installed at the end of the feeding air duct 2. The multiple groups of material guiding plates 61 are distributed in a ring shape. The supporting assembly 62 is located on the surface of the feeding air duct 2 and is connected to the material guiding plates 61. The adjusting assembly 63 is connected to the supporting assembly 62. When the feeding air duct 2 moves back and forth, the adjusting assembly 63 controls the multiple groups of material guiding plates 61 to swing synchronously back and forth at the end of the feeding air duct 2 by cooperating with the supporting assembly 62.

[0024] When in use, the feed air duct 2 blows the coal powder into the inner cavity of the rotary kiln for combustion, the combustion-supporting air duct 3 transports the external combustion-supporting air into the inner cavity of the rotary kiln and discharges it through the air outlet 31, and the telescopic component 4 controls the feed air duct 2 to move back and forth along the axis of the rotary kiln while blowing the coal powder. When the feed air duct 2 moves back and forth to blow the coal powder, the rotating component 51 cooperates with the driving component 52 to control the air outlet 31 to rotate continuously at the end of the combustion-supporting air duct 3, and the air outlet 31 can conveniently adjust the discharge direction of the combustion-supporting air, thereby performing all-round blowing treatment on the inner cavity of the rotary kiln, effectively improving the combustion efficiency of the coal powder in the inner cavity of the rotary kiln. When the feeding air duct 2 moves back and forth, the adjustment component 63 cooperates with the support component 62, and the multiple groups of guide plates 61 can be controlled to automatically swing back and forth at the port of the feeding air duct 2. The multiple groups of guide plates 61 cooperate with each other, and the opening degree at the port of the feeding air duct 2 can be conveniently adjusted. When the opening at the port of the feeding air duct 2 is small, the feeding air duct 2 can accelerate the blowing speed of the coal powder when blowing the coal powder, and then increase the blowing distance of the coal powder. When the opening at the port of the feeding air duct 2 is large, the blowing speed of the coal powder at the port of the feeding air duct 2 is reduced, which can shorten the blowing distance of the coal powder in the inner cavity of the rotary kiln. The reciprocating cycle can blow the coal powder into the inner cavity of the rotary kiln in all directions.

[0025] like Figure 1 , Figure 3 , Figure 6 As shown, as a preferred embodiment of the present invention, the telescopic assembly 4 includes a base 41, a cross bar 43 is fixedly installed on the bottom wall of the feeding air duct 2, a strip-shaped limiting groove 44 is provided on the surface of the cross bar 43, a motor 42 is fixedly installed on the surface of the base 41, and a control disk 45 located below the cross bar 43 is fixedly installed on the output shaft of the motor 42, and a limiting column 46 is provided on the surface of the control disk 45 at a position deviating from the center of the circle, and the limiting column 46 is inserted into the limiting groove 44.

[0026] When in use, the motor 42 drives the control disk 45 to rotate, and the control disk 45 drives the limit column 46 to rotate synchronously. The limit column 46 cooperates with the limit groove 44 to push the cross bar 43 to move back and forth above the control disk 45. The cross bar 43 drives the feed air duct 2 to move back and forth synchronously on the surface of the kiln head seat 1. When the feed air duct 2 blows the coal powder, the blowing position of the coal powder in the inner cavity of the rotary kiln can be slightly adjusted.

[0027] like Figure 1 , Figure 2 , Figure 5As shown, as a preferred embodiment of the present invention, the rotating component 51 includes an annular gear ring 511 arranged on the surface of the air outlet pipe 31, and two groups of relatively distributed fixed plates 512 are fixedly installed on the surface of the combustion-supporting air duct 3, and a transmission shaft 513 is installed on the two groups of fixed plates 512 for rotation together, and a transmission gear plate 514 is fixedly installed on the surface of the transmission shaft 513, and the transmission gear plate 514 is meshingly connected with the gear ring 511.

[0028] When the feeding air duct 2 moves along the axis of the rotary kiln, the driving assembly 52 controls the transmission shaft 513 to rotate on the surfaces of the two sets of fixed plates 512, and the transmission shaft 513 drives the transmission gear plate 514 to rotate synchronously. The transmission gear plate 514 engages with the gear ring 511 for transmission, which can drive the air outlet 31 to continuously rotate at the end of the combustion-supporting air duct 3, and the air outlet 31 can conveniently adjust the blowing direction of the combustion-supporting port.

[0029] like Figure 1 , Figure 2 , Figure 3 , Figure 5 As shown, as a preferred embodiment of the present invention, the driving assembly 52 includes a plurality of groups of first side plates 521 arranged opposite to each other in pairs, which are fixedly installed on the side wall of the kiln head seat 1. The plurality of groups of first side plates 521 arranged opposite to each other in pairs are distributed in a ring shape around the feeding air duct 2. The side wall of the kiln head seat 1 is fixedly installed with a plurality of groups of second side plates 525 arranged opposite to each other in pairs. The two groups of first side plates 521 arranged opposite to each other are jointly rotatably installed with a first rotating column 526. The two groups of second side plates 525 arranged opposite to each other are jointly rotatably installed with a second rotating column 522. The first rotating column 52 A fixed toothed disc 523 is fixedly mounted on the surface of the first rotating column 526, a rack 524 meshingly connected to the fixed toothed disc 523 is arranged on the surface of the feeding air duct 2, synchronous discs 527 are fixedly mounted on the surfaces of the first rotating column 526 and the second rotating column 522 respectively, and the two sets of synchronous discs 527 are commonly connected with a synchronous belt 528, and an active helical toothed disc 529 is fixedly mounted on the surface of the second rotating column 522, and a driven helical toothed disc 520 is fixedly mounted on one end of the transmission shaft 513 facing the second rotating column 522, and the driven helical toothed disc 520 is meshingly connected with the active helical toothed disc 529.

[0030] When the feeding air duct 2 moves back and forth, it drives the rack 524 to move synchronously. When moving, the rack 524 engages with the fixed gear plate 523 for transmission, which can drive the first rotating column 526 to rotate. The first rotating column 526 drives the synchronous disk 527 to rotate. The two sets of synchronous disks 527 and the synchronous belt 528 cooperate with each other to drive the second rotating column 522 to rotate synchronously. The second rotating column 522 drives the active bevel gear plate 529 to rotate. The active bevel gear plate 529 engages with the driven bevel gear plate 520 for transmission, which can drive the transmission shaft 513 to rotate.

[0031] like Figure 1 , Figure 3 , Figure 4As shown, as a preferred embodiment of the present invention, the support assembly 62 includes a control ring 621 which is sleeved on the surface of the feeding air duct 2, and a plurality of groups of guide grooves 622 which are distributed in an annular shape are provided on the surface of the feeding air duct 2. A sliding block 623 is fixedly installed on the inner wall of the control ring 621, and the sliding block 623 extends through the guide groove 622 to the inner cavity of the feeding air duct 2. A push-pull rod 624 is rotatably installed on the side wall of the sliding block 623, and the push-pull rod 624 is rotatably connected to the guide plate 61 at one end away from the sliding block 623.

[0032] The sliding block 623 cooperates with the push-pull rod 624 to support and position the material guide plate 61. When the feeding air duct 2 moves along the axis of the rotary kiln, the adjustment component 63 can automatically adjust the relative position of the control ring 621 and the feeding air duct 2. The control ring 621 drives the sliding block 623 to move synchronously. The sliding block 623 cooperates with the push-pull rod 624 to control the material guide plate 61 to swing back and forth at the port of the feeding air duct 2. Multiple groups of material guide plates 61 cooperate with each other to conveniently adjust the degree of opening at the port of the feeding air duct 2.

[0033] like Figure 1 , Figure 3 , Figure 4 As shown, as a preferred embodiment of the present invention, the adjustment component 63 includes a plurality of pulling springs 631 fixedly installed on the side wall of the kiln head seat 1, the telescopic end of the pulling spring 631 is connected to the side wall of the control ring 621, and an extrusion spring 632 is fixedly installed in the guide groove 622, and the telescopic end of the extrusion spring 632 is connected to the sliding block 623.

[0034] Initially, the extrusion spring 632 applies a thrust to the sliding block 623. At this time, the sliding block 623 is located in the guide groove 622 at one end close to the guide plate 61. At this time, the plurality of guide plates 61 control the opening degree of the port of the feeding air duct 2 to be at the maximum. When the feeding air duct 2 moves toward the inner cavity of the rotary kiln, the pulling spring 631 applies a pulling force to the control ring 621. The control ring 621 drives the sliding block 623 to move in the guide groove 622 away from the guide plate 61. The sliding block 623 cooperates with the push-pull rod 624 to apply a pulling force to the guide plate 61. The plurality of guide plates 61 rotate synchronously, thereby gradually reducing the opening degree at the port of the feeding air duct 2.

[0035] like Figure 1 , Figure 3 , Figure 4 As shown, as a preferred embodiment of the present invention, the pulling spring 631, the extruding spring 632 and the guide plate 61 are all made of high temperature resistant materials.

[0036] The working principle of the present invention is: when in use, the feed air duct 2 blows the coal powder into the inner cavity of the rotary kiln for combustion, the combustion-supporting air duct 3 conveys the external combustion-supporting air into the inner cavity of the rotary kiln and discharges it through the air outlet 31, the motor 42 drives the control disk 45 to rotate, the control disk 45 drives the limit column 46 to rotate synchronously, the limit column 46 and the limit groove 44 cooperate with each other, and can push the cross bar 43 to reciprocate above the control disk 45, the cross bar 43 drives the feed air duct 2 to reciprocate synchronously on the surface of the kiln head seat 1, and when the feed air duct 2 blows the coal powder, the blowing position of the coal powder in the inner cavity of the rotary kiln can be slightly adjusted.

[0037] When the feeding air duct 2 reciprocates, it drives the rack 524 to move synchronously. When the rack 524 moves, it meshes with the fixed toothed disc 523 to drive, which can drive the first rotating column 526 to rotate. The first rotating column 526 drives the synchronous disc 527 to rotate. The two sets of synchronous discs 527 cooperate with the synchronous belt 528 to drive the second rotating column 522 to rotate synchronously. The second rotating column 522 drives the active helical toothed disc 529 to rotate. The active helical toothed disc 529 and the driven helical toothed disc 520 mesh and drive, which can drive the transmission shaft 513 to rotate. The transmission shaft 513 drives the transmission toothed disc 514 to rotate synchronously. The transmission toothed disc 514 meshes and drives with the gear ring 511, which can drive the air outlet 31 to rotate continuously at the end of the combustion-supporting air duct 3. The air outlet 31 can conveniently adjust the blowing direction of the combustion-supporting port. The air outlet 31 can conveniently adjust the exhaust direction of the combustion-supporting air, thereby performing all-round air blowing treatment on the inner cavity of the rotary kiln, effectively improving the combustion efficiency of the coal powder in the inner cavity of the rotary kiln.

[0038] The extrusion spring 632 applies a thrust to the sliding block 623. At this time, the sliding block 623 is located at one end close to the guide plate 61 in the guide groove 622. At this time, the opening degree of the port of the feed air duct 2 controlled by the multiple groups of guide plates 61 is at the maximum. When the feed air duct 2 moves toward the inner cavity of the rotary kiln, the pulling spring 631 applies a pulling force to the control ring 621. The control ring 621 drives the sliding block 623 to move in the guide groove 622 in a direction away from the guide plate 61. The sliding block 623 cooperates with the push-pull rod 624 to apply a pulling force to the guide plate 61. The multiple groups of guide plates 61 rotate synchronously, thereby gradually reducing the opening degree at the port of the feed air duct 2. The multiple groups of guide plates 61 cooperate with each other to conveniently adjust the opening degree at the port of the feed air duct 2. When the opening at the port of the feed air duct 2 is small, the blowing speed of the coal powder can be accelerated when the feed air duct 2 blows the coal powder, thereby increasing the blowing distance of the coal powder. When the opening at the port of the feed air duct 2 is large, the blowing speed of the coal powder at the port of the feed air duct 2 is reduced, thereby shortening the blowing distance of the coal powder in the inner cavity of the rotary kiln. By repeating the cycle, the coal powder can be blown into the inner cavity of the rotary kiln in all directions.

[0039] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A rotary kiln combustion-supporting air inlet structure, comprising a kiln head seat, a feeding air duct is slidably mounted in the middle of the kiln head seat, a plurality of groups of combustion-supporting air ducts are fixedly mounted on the surface of the kiln head seat, and the plurality of groups of combustion-supporting air ducts are distributed in a circular manner with equal spacing around the feeding air duct, characterized in that: The combustion-supporting air duct is located at one end of the inner cavity of the rotary kiln and is rotatably installed with an air outlet, the air outlet is set to an inclined structure, the feed air duct is connected with a telescopic component, the telescopic component is used to control the feed air duct to move back and forth on the surface of the kiln head seat along the axis of the rotary kiln, the surface of the combustion-supporting air duct is provided with a positioning mechanism that cooperates with the air outlet, the positioning mechanism includes a rotating component and a driving component, the rotating component is located on the surface of the combustion-supporting air duct and is connected to the air outlet, the driving component is connected to the rotating component, when the feed air duct reciprocates, the driving component controls the air outlet at the end of the combustion-supporting air duct to rotate synchronously by cooperating with the rotating component, the rotating component includes an annular gear ring arranged on the surface of the air outlet, Two groups of relatively distributed fixed plates are fixedly installed on the surface of the combustion air duct, and a transmission shaft is installed on the two groups of fixed plates for common rotation. A transmission gear disk is fixedly installed on the surface of the transmission shaft, and the transmission gear disk is meshingly connected with the gear ring. The driving assembly includes multiple groups of first side plates distributed relatively to each other in pairs fixedly installed on the side wall of the kiln head seat, and multiple groups of first side plates distributed relatively to each other in pairs are distributed in a ring around the feeding air duct. Multiple groups of second side plates distributed relatively to each other in pairs are fixedly installed on the side wall of the kiln head seat, and the two relatively distributed groups of first side plates are jointly rotatably installed with a first rotating column, and the two relatively distributed groups of second side plates are jointly rotatably installed with a second rotating column, and a fixed gear disk is fixedly installed on the surface of the first rotating column, and a rack meshingly connected with the fixed gear disk is provided on the surface of the feeding air duct, and the first rotating column is connected to the second rotating column. Synchronous disks are fixedly installed on the surface of the columns respectively, and the two groups of synchronous disks are commonly connected with a synchronous belt. An active helical toothed disk is fixedly installed on the surface of the second rotating column, and a driven helical toothed disk is fixedly installed on one end of the transmission shaft facing the second rotating column, and the driven helical toothed disk is meshingly connected with the active helical toothed disk. The feeding air duct is located at one end of the inner cavity of the rotary kiln and is provided with a material guiding mechanism, and the material guiding mechanism includes a material guiding plate, a supporting assembly and an adjusting assembly. The material guiding plates are provided with multiple groups and are rotatably installed on the end of the feeding air duct, and the multiple groups of material guiding plates are distributed in a ring shape. The supporting assembly is located on the surface of the feeding air duct and is connected to the material guiding plate. The adjusting assembly is connected to the supporting assembly. When the feeding air duct moves back and forth, the adjusting assembly controls the multiple groups of material guiding plates by cooperating with the supporting assembly. The plate swings back and forth synchronously at the end of the feeding air duct, the supporting assembly includes a control ring sleeved on the surface of the feeding air duct, and a plurality of guide grooves distributed in an annular pattern are provided on the surface of the feeding air duct, a sliding block is fixedly installed on the inner wall of the control ring, and the sliding block extends through the guide groove to the inner cavity of the feeding air duct, and a push-pull rod is rotatably installed on the side wall of the sliding block, and the end of the push-pull rod away from the sliding block is rotatably connected to the guide plate, and the adjusting assembly includes a plurality of pulling springs fixedly installed on the side wall of the kiln head seat, the telescopic end of the pulling spring is connected to the side wall of the control ring, and an extrusion spring is fixedly installed in the guide groove, and the telescopic end of the extrusion spring is connected to the sliding block. Initially, the plurality of guide plates control the opening degree of the feeding air duct port to be at the maximum, and when the feeding air duct moves toward the inner cavity of the rotary kiln,Multiple groups of guide plates rotate synchronously to gradually reduce the opening degree of the feeding air duct port.

2. A rotary kiln combustion-supporting air inlet structure according to claim 1, characterized in that: The telescopic assembly includes a base, a cross bar is fixedly installed on the bottom wall of the feeding air duct, a strip-shaped limit groove is opened on the surface of the cross bar, a motor is fixedly installed on the surface of the base, a control disk located below the cross bar is fixedly installed on the output shaft of the motor, and a limit column is arranged on the surface of the control disk at a position deviating from the center of the circle, and the limit column is inserted into the limit groove.

3. The combustion-supporting air inlet structure of a rotary kiln according to claim 1, characterized in that: The pulling spring, the extruding spring and the guide plate are all made of high temperature resistant materials.

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