Labyrinth butterfly valve shaft neck bushing and cement kiln tertiary air adjustment mechanism

Abstract

The invention discloses a labyrinth butterfly valve shaft neck bushing and a cement kiln tertiary air regulating mechanism. The labyrinth butterfly valve shaft neck bushing comprises an inner sleeve and a sleeve, wherein the sleeve is sleeved on the outside of the inner sleeve; and after installation, the bottom of the inner sleeve is higher than the bottom of the inner sleeve; and the installation shaft of the butterfly valve is arranged in the inner sleeve. The labyrinth butterfly valve shaft neck bushing can effectively prevent the shaft pivot of the cement kiln tertiary air regulating mechanism from being corroded, thereby increasing the service life of the cement kiln tertiary air regulating mechanism.

Description

Technical Field

[0001] The invention relates to tertiary air regulation of a cement kiln, and in particular to a labyrinth butterfly valve shaft neck bushing and a tertiary air regulation mechanism of a cement kiln. Background Art

[0002] In the new dry process cement production line, the distribution of air volume for the kiln and the decomposition furnace is achieved through the kiln tail shrinkage and the opening control of the tertiary air damper. The tertiary air damper is an important component of the kiln system operation control. Its main function is to adjust the balance of the air volume in the cement kiln and the air volume in the decomposition furnace, which directly affects the operation rate of the cement kiln and the quality of cement. Therefore, the tertiary air damper has extremely high requirements for reliability.

[0003] The tertiary air damper in China usually adopts heat-resistant steel butterfly valve, heat-resistant steel gate or heat-resistant steel castable gate. Common faults include: gate deformation and jamming, castable peeling and wear, and gate breakage and damage. At present, the tertiary air damper is fixed on the kiln tail through the shaft pivot, but during the operation of the tertiary air damper, the shaft pivot is seriously damaged, so that the service life of the tertiary air damper cannot be guaranteed. Summary of the invention

[0004] The purpose of the present invention is to provide a labyrinth butterfly valve shaft neck bushing and a cement kiln tertiary air regulating mechanism, wherein the labyrinth butterfly valve shaft neck bushing can effectively prevent the shaft pivot of the cement kiln tertiary air regulating mechanism from being corroded, thereby increasing the service life of the cement kiln tertiary air regulating mechanism.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a labyrinth butterfly valve shaft neck bushing, including an inner sleeve and a sleeve, wherein the sleeve is sleeved on the outside of the inner sleeve; and after installation, the bottom of the inner sleeve is higher than the bottom of the sleeve; the installation shaft of the butterfly valve is arranged in the inner sleeve.

[0006] Preferably, the inner sleeve comprises a main cylinder and an annular ear plate, wherein the annular ear plate is arranged on the top of the main cylinder and extends outwards.

[0007] The present invention also provides a tertiary air regulating mechanism for a cement kiln, which is installed on the kiln tail through the above-mentioned labyrinth butterfly valve shaft neck bushing, a mounting hole is provided at the lower end of the top of the kiln tail, a through hole is provided at the top of the mounting hole, the through hole is connected to the outside of the kiln tail, and a step mechanism is formed between the mounting holes and the through holes; the inner sleeve is installed in the through hole, the sleeve is installed in the mounting hole, and a butterfly valve is connected below the mounting shaft.

[0008] Preferably, the inner set comprises a main cylinder and an annular ear plate, wherein the annular ear plate is arranged on the top of the main cylinder and extends outward; the annular ear plate is located at the topmost part of the kiln tail.

[0009] Preferably, a boss is provided at the bottom of the kiln tail, a notch is formed at the bottom of the butterfly valve, and an anti-dust accumulation gap is formed between the notch and the boss.

[0010] Preferably, along the air flow direction, the cross section of the boss is trapezoidal.

[0011] Preferably, the slope of the air inlet side of the boss is smaller than the slope of the air outlet side of the boss.

[0012] Preferably, the mounting shaft is a suspended single shaft, the end of which extends to the outside of the kiln tail, and a turntable bearing is fixed to the end of the suspended single shaft, the turntable bearing is connected to a transmission gear, and the transmission gear is meshed with the output shaft of the motor.

[0013] Preferably, the inner wall of the kiln tail of the cement kiln is provided with a castable layer and a calcium silicate board layer in sequence from the inside to the outside.

[0014] In the present technical scheme, the inventors discovered through their own creative work that the shaft pivot of the tertiary air regulating mechanism of the cement kiln was damaged due to the damage caused by clinker particles, hot air flow and flying sand, etc. Therefore, the labyrinth butterfly valve shaft neck bushing provided by the present invention forms a labyrinth loop on the periphery of the installation shaft through the cooperation of the inner sleeve and the sleeve. The labyrinth loop increases the entry stroke of clinker particles, hot air flow and flying sand, etc., thereby avoiding the damage of clinker particles, hot air flow and flying sand to the installation shaft; the tertiary air regulating mechanism of the cement kiln is installed at the tail of the kiln through the labyrinth butterfly valve shaft neck bushing, thereby, the stability of the installation shaft of the cement kiln tertiary air regulating mechanism is guaranteed during the operation, thereby, the overall service life of the cement kiln tertiary air regulating mechanism is also improved.

[0015] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 This is a diagram of the preferred use state of the labyrinth butterfly valve journal bushing provided by the present invention;

[0018] Figure 2 yes Figure 1 A schematic structural diagram of a preferred embodiment of the inner and outer kit;

[0019] Figure 3 yes Figure 1 A schematic diagram of the structure of the middle sleeve;

[0020] Figure 4It is a structural schematic diagram of a preferred implementation mode of the cement kiln tertiary air regulating mechanism provided by the present invention.

[0021] Description of Reference Numerals

[0022] 1. Kiln tail 2. Butterfly valve

[0023] 3. Inner set 4. Anti-dust clearance

[0024] 5. Casting material layer 6. Calcium silicon board layer

[0025] 7. Transmission gear 8. Turntable bearing

[0026] 9. Sleeve 10. Main cylinder

[0027] 11. Ring-shaped ear plate DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0029] In the present invention, unless otherwise stated, directional words such as "upper, lower, inside, outside" contained in a term merely represent the orientation of the term in normal usage, or are common names understood by those skilled in the art, and should not be regarded as limitations on the term.

[0030] The present invention provides a labyrinth butterfly valve shaft neck bushing, such as Figure 1-3 As shown, it includes an inner sleeve 3 and a sleeve 9, wherein the sleeve 9 is sleeved on the outside of the inner sleeve 3; and after installation, the bottom of the inner sleeve 3 is higher than the bottom of the sleeve 9; and the installation shaft 1 of the butterfly valve 2 is arranged in the inner sleeve 3.

[0031] The above-mentioned labyrinth butterfly valve shaft neck bushing forms a labyrinth loop around the periphery of the installation shaft 1 through the cooperation of the inner set 3 and the sleeve 9. The labyrinth loop increases the entry distance of clinker particles, hot air flow and flying sand, thereby avoiding the damage of clinker particles, hot air flow and flying sand to the installation shaft 1; at the same time, the labyrinth loop can also prevent air leakage. The tertiary air regulating mechanism of the cement kiln is installed at the tail of the kiln through the labyrinth butterfly valve shaft neck bushing. Therefore, the stability of the installation shaft 1 is guaranteed during the operation of the tertiary air regulating mechanism of the cement kiln, thereby improving the overall service life of the tertiary air regulating mechanism of the cement kiln.

[0032] In the present invention, the structure of the inner sleeve 3 can be selected within a wide range, but in order to further improve the stability of the inner sleeve 3, preferably, the inner sleeve 3 includes a main cylinder 10 and an annular ear plate 11, and the annular ear plate 11 is arranged on the top of the main cylinder 10 and extends outward.

[0033] In the present invention, the material of the inner sleeve 3 and the sleeve 9 can be selected within a wide range, but in order to further improve the service life, preferably, the material of the inner sleeve 3 is 0Cr25Ni20 steel, and the material of the sleeve 9 is heat-resistant ceramics, such as high alumina.

[0034] The present invention also provides a cement kiln tertiary air regulating mechanism, such as Figure 1-2 As shown, the cement kiln tertiary air regulating mechanism is installed on the kiln tail through the above-mentioned labyrinth butterfly valve shaft neck bushing ( Figure 4 At position A in the figure), a mounting hole is arranged at the lower end of the top of the kiln tail, a through hole is arranged at the top of the mounting hole, the through hole is connected with the outside of the kiln tail, and a step mechanism is formed between the mounting hole and the through hole; the inner sleeve 3 is installed in the through hole, the sleeve 9 is installed in the mounting hole, and a butterfly valve 2 is connected below the mounting shaft 1.

[0035] Wherein, when the inner set 3 includes the main cylinder 10 and the annular ear plate 11, the annular ear plate 11 is arranged on the top of the main cylinder 10 and extends outward; the annular ear plate 11 is located at the top of the kiln tail.

[0036] In the present invention, in order to further improve the service life of the tertiary air regulating mechanism of the cement kiln, preferably, a boss is provided at the bottom of the kiln tail, a notch is formed at the bottom of the butterfly valve 2, and an anti-dust gap 4 is formed between the notch and the boss. By providing a boss at the bottom of the kiln tail, a notch is provided at the bottom of the butterfly valve 2, and an anti-dust gap 4 is formed between the notch and the boss (except for the anti-dust gap 4, the other edges of the butterfly valve 2 can close the inner edge of the kiln tail). The density of clinker particles is relatively large and is generally distributed below the fluid. The boss structure can accelerate the wind speed at the bottom of the kiln tail, thereby allowing the clinker particles to quickly pass through the tertiary air damper through the anti-dust gap 4, thereby preventing the deposition and adhesion of clinker particles on the tertiary air damper, thereby improving the service life of the tertiary air damper.

[0037] In the present invention, the structure of the boss can be selected within a wide range, but in order to further increase the air inlet velocity at the bottom of the kiln tail, preferably, along the airflow direction, the cross section of the boss is trapezoidal. By providing the boss, a constriction structure is formed at the kiln tail, thereby increasing the air inlet velocity at the bottom of the kiln tail, and further avoiding the deposition of clinker particles. In order to further enhance the effect of the boss, preferably, the slope of the air inlet side of the boss is smaller than the slope of the air outlet side of the boss. In particular, a larger slope on the air inlet side can both increase the wind speed and further avoid the deposition of clinker particles on the air inlet side.

[0038] In the present invention, the height of the dust-preventing gap 4 can be selected within a wide range, but in order to ensure that the butterfly valve 2 can adjust the air intake at the kiln tail on the one hand, and can timely discharge the clinker particles entering the air on the other hand, preferably, the height of the dust-preventing gap 4 is 15-20 cm, and the diameter of the butterfly valve is 2-3 m. The height of 15-20 cm can simultaneously meet the requirements of air intake adjustment and discharge of clinker particles entering the air.

[0039] In the present invention, the structure of the boss can be selected within a wide range, but in order to further increase the air inlet velocity at the bottom of the kiln tail, preferably, the slope of the air inlet side of the boss is smaller than the slope of the air outlet side of the boss. By providing the boss, a constriction structure is formed at the kiln tail, thereby increasing the air inlet velocity at the bottom of the kiln tail and further avoiding the deposition of clinker particles. In order to further enhance the effect of the boss, preferably, the slope of the air inlet side of the boss is smaller than the slope of the air outlet side of the boss. In particular, a larger slope on the air inlet side can both increase the wind speed and further avoid the deposition of clinker particles on the air inlet side.

[0040] In this embodiment, the rotation mode of the butterfly valve 2 can be selected within a wide range, but in order to further improve the convenience of the operation of the butterfly valve 2, preferably, the installation shaft 1 is a suspended single shaft, the end of the suspended single shaft extends to the outside of the kiln tail, and a turntable bearing 8 is fixed to the end of the suspended single shaft, the turntable bearing 8 is connected to the transmission gear 7, and the transmission gear 7 is meshed with the output shaft of the motor. Therefore, as long as the motor is started, the turntable bearing 8 can be driven to rotate through the transmission gear 7, thereby driving the opening and closing of the butterfly valve 2. At the same time, the butterfly valve 2 is set with a suspended single shaft, which improves the convenience of installation and maintenance of the butterfly valve 2 and improves its use prospects. In addition, the suspended single shaft can also avoid damage to the shaft pivot caused by high-speed and high-temperature dust.

[0041] In the present invention, in order to further prevent damage to the kiln tail from affecting the normal operation of the tertiary air regulating device, preferably, the inner wall of the kiln tail of the cement kiln is sequentially provided with a castable layer 5 and a calcium silicon board layer 6 from the inside to the outside. Thus, the double guarantee of the castable layer 5 and the calcium silicon board layer 6 effectively ensures the normal operation of the kiln tail of the cement kiln.

[0042] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0043] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0044] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A tertiary air regulating mechanism for a cement kiln, characterized in that: The cement kiln tertiary air regulating mechanism is installed on the kiln tail through a labyrinth butterfly valve shaft neck bushing, a mounting hole is provided at the lower end of the top of the kiln tail, a through hole is provided at the top of the mounting hole, the through hole is connected to the outside of the kiln tail, and a step mechanism is formed between the mounting hole and the through hole; the labyrinth butterfly valve shaft neck bushing comprises an inner sleeve (3) and a sleeve (9), the sleeve (9) is sleeved on the outside of the inner sleeve (3); and after installation, the bottom of the inner sleeve (3) is higher than the bottom of the sleeve (9); the mounting shaft (1) of the butterfly valve (2) is arranged in the inner sleeve (3); the sleeve (9) is made of heat-resistant ceramic, the inner sleeve (3) is installed in the through hole, the sleeve (9) is installed in the mounting hole, and the butterfly valve (2) is connected below the mounting shaft (1).

2. The tertiary air regulating mechanism of cement kiln according to claim 1 is characterized in that: The inner set (3) comprises a main cylinder (10) and an annular ear plate (11), wherein the annular ear plate (11) is arranged on the top of the main cylinder (10) and extends outwards; the annular ear plate (11) is located at the topmost part of the kiln tail.

3. The tertiary air regulating mechanism of cement kiln according to claim 1, characterized in that: A boss is provided at the bottom of the kiln tail, a notch is formed at the bottom of the butterfly valve (2), and an anti-dust accumulation gap (4) is formed between the notch and the boss.

4. The tertiary air regulating mechanism of cement kiln according to claim 3 is characterized in that: Along the airflow direction, the cross section of the boss is trapezoidal.

5. The tertiary air regulating mechanism of cement kiln according to claim 4, characterized in that: The slope of the air inlet side of the boss is smaller than the slope of the air outlet side of the boss.

6. The tertiary air regulating mechanism of cement kiln according to claim 1, characterized in that: The mounting shaft (1) is a suspended single shaft, the end of which extends to the outside of the kiln tail, and a turntable bearing (8) is fixed to the end of the suspended single shaft, the turntable bearing (8) is connected to a transmission gear (7), and the transmission gear (7) is meshed with an output shaft of a motor.

7. The tertiary air regulating mechanism of cement kiln according to claim 1, characterized in that: The inner wall of the kiln tail of the cement kiln is provided with a castable layer (5) and a calcium silicate board layer (6) in sequence from the inside to the outside.

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