Annealing furnace combustion air preheating device

Abstract

The application provides an annealing furnace combustion air preheating device and relates to the technical field of air preheating combustion equipment. The preheating box is internally fixed with multiple rows of preheating pipes; a threaded propelling shaft is rotationally arranged at a position close to the leeward side of the preheating pipes inside the preheating box, and a vertical guide shaft is parallelly welded at a position close to the threaded propelling shaft inside the preheating box; a retaining ring is slidably sleeved on the preheating pipe, a gear ring is rotationally installed on the retaining ring, a retaining ring is welded on the gear ring, two annular steel wire brushes with different sizes are fixed to the inner and outer circumferences of the retaining ring respectively, the brush wires on the inner annular steel wire brush are uniformly distributed on the inner circumference of the supporting ring, and the brush wires on the outer annular steel wire brush are uniformly distributed on the outer circumference of the supporting ring; the driving gear is in meshing transmission with the gear ring, and the driving gear is limited between the transmission plate and the limiting baffle. The application can omit the trouble of exposing the preheating pipes by greatly disassembling the preheating device, so that the preheating pipes can be cleaned, and is simple, convenient, efficient and easy to operate.

Description

TECHNICAL FIELD

[0001] The present application relates to air preheating combustion-supporting equipment technical field, especially to an annealing furnace combustion-supporting air preheating device. BACKGROUND

[0002] In the annealing process of steel workpieces, the air conveyed in the annealing furnace is preheated by using the tail gas of the annealing furnace, which can improve the combustion speed and complete combustion degree of the fuel, support the combustion of the fuel, and reduce the heat loss caused by incomplete combustion. The waste heat combustion of air needs to be implemented by the furnace combustion-supporting air preheating device.

[0003] Most of the existing preheating devices do not have a cleaning mechanism that can directly clean the dust adhered to the outer periphery of the air preheating pipe inside the preheating device, which requires the preheating device to be disassembled in whole to expose the air preheating pipe for cleaning. The operation and use are more troublesome and inconvenient. Although some preheating devices are equipped with a cleaning mechanism, which can solve the above problems, the cleaning mechanism cannot be adjusted and placed in the appropriate position when it is idle, which will produce a blocking and disturbing effect, interfere with the normal blowing and flowing of the high-temperature flue gas in the preheating device, and thus reduce the preheating temperature rise effect of the high-temperature flue gas on the combustion-supporting air. SUMMARY

[0004] Therefore, the present application provides an annealing furnace combustion-supporting air preheating device to solve the problem that the cleaning mechanism cannot be adjusted and placed in the appropriate position when it is idle, which will produce a blocking and disturbing effect.

[0005] The technical scheme provided by the present application is as follows: an annealing furnace combustion-supporting air preheating device, specifically comprising a preheating box, a plurality of preheating pipes are fixedly connected inside the preheating box;

[0006] A threaded advancing shaft is rotatably arranged at a position close to the leeward side of the preheating pipe inside the preheating box, and a vertical guide shaft is parallelly welded at a position close to the threaded advancing shaft inside the preheating box; a retaining ring is slidably sleeved on the preheating pipe, a gear ring is rotatably installed on the retaining ring, a retaining ring is welded on the gear ring, and two annular wire brushes with small and large diameters are fixed to the inner and outer peripheries of the retaining ring respectively, the bristles on the inner annular wire brush are uniformly distributed on the inner periphery of its supporting ring, and the bristles on the outer annular wire brush are uniformly distributed on the outer periphery of its supporting ring; a U-shaped transmission member is fixedly connected to the retaining ring, the U-shaped transmission member is composed of a shaft sleeve and a transmission plate and a limiting baffle integrally formed at both ends of the shaft sleeve, the threaded advancing shaft is threadedly engaged with the transmission plate, and the shaft sleeve is slidably connected with the vertical guide shaft; a drive gear is slidably installed on the threaded advancing shaft, two key strips are integrally formed on the inner periphery of the drive gear shaft hole, two key grooves are formed on the outer periphery of the threaded advancing shaft, and the two key strips and the two key grooves are slidably connected; the drive gear is in meshing transmission with the gear ring, and the drive gear is limited between the transmission plate and the limiting baffle.

[0007] Further, the brush wires on the inner ring-shaped steel wire brush are in scraping contact with the outer periphery of the retaining ring, and the brush wires on the outer ring-shaped steel wire brush are in scraping contact with the threaded advancing shaft.

[0008] Further, the retaining ring has an L-shaped cross-section structure, and the inner diameter of the retaining ring is greater than the outer diameter of the preheating pipe.

[0009] The two ends of the preheating pipe are respectively welded through the two short side walls of the preheating box.

[0010] The inner periphery of the gear ring is provided with an annular track groove, and the gear ring is rotationally assembled with the retaining ring through the annular track groove.

[0011] Further, the leading end of the transmission plate is welded and fixed to the outer periphery of the retaining ring.

[0012] The leading end of the limiting baffle is provided with a crescent-shaped groove, the crescent-shaped groove is in sliding cooperation with the threaded advancing shaft, and a gap is maintained between the two.

[0013] Further, the two ends of the threaded advancing shaft are respectively rotationally matched with the two short side walls of the preheating box, one end of the threaded advancing shaft protruding from the preheating box is fixedly sleeved with a driving sprocket, and the driving sprocket is installed with a synchronous chain.

[0014] The outer side of one short side wall of the preheating box is welded with multiple wheel shafts, the leading end of each wheel shaft is fixedly sleeved with a guide sprocket, and the synchronous chain is sequentially threaded through all the driving sprockets and guide sprockets and is engaged with all the driving sprockets and guide sprockets.

[0015] The guide sprockets distributed on the synchronous chain transmission path can cover the synchronous chain on the driving sprocket.

[0016] Further, a circular loading sleeve is welded at a position around the threaded advancing shaft on the outer side of one short side wall of the preheating box, the circular loading sleeve is concentrically arranged with the threaded advancing shaft, a coiled packing is filled in the circular loading sleeve, and the inner periphery of the coiled packing is in extrusion contact with the part of the threaded advancing shaft protruding from the preheating box.

[0017] Two threaded drive shafts are symmetrically rotationally connected at a position around the circular loading sleeve on the outer side of one short side wall of the preheating box, a pressing ring is slidingly inserted in the circular loading sleeve, the pressing ring is in pressing abutting contact with the coiled packing, two threaded shaft sleeves are symmetrically welded on the outer periphery of the pressing ring, and the two threaded drive shafts are threadedly engaged with the two threaded shaft sleeves.

[0018] Further, a conical diffusion cover and a conical gas collecting cover are respectively fixedly connected to the two ends of the preheating box, a driving assembly is fixedly suspended inside the conical diffusion cover, the driving assembly is composed of a servo motor and a speed reducer, and the power output shaft of the speed reducer is connected with the corresponding threaded advancing shaft through a shaft coupling.

[0019] Further, the two ends of the preheating pipe are respectively covered by a conical diffusion cover and a conical gas collecting cover, the leading ends of the conical diffusion cover and the conical gas collecting cover are respectively welded with an air inlet pipe and an air outlet pipe, the air outlet pipe is connected with a blower of the annealing furnace through an external pipeline;

[0020] The electric control box is fixedly installed outside the conical diffusion cover, and a servo driver is arranged in the electric control box and electrically connected with a servo motor.

[0021] Further, the two long side walls of the preheating box are respectively welded with a conical smoke collecting cover and a conical smoke diffusing cover arranged in communication therewith, the leading ends of the conical smoke collecting cover and the conical smoke diffusing cover are respectively welded with a smoke outlet pipe and a smoke inlet pipe, the smoke outlet pipe is connected with a subsequent flue gas treatment process through an external pipeline, and the smoke inlet pipe is connected with a smoke stack of the annealing furnace through an external pipeline;

[0022] The bottom of the preheating box is welded with a conical ash collecting cover, the bottom of the conical ash collecting cover is welded with an ash discharge pipe, the bottom ash discharge opening of the ash discharge pipe is covered with a cover plate, and the bottom of the preheating box is symmetrically welded with two U-shaped supports.

[0023] The annealing furnace combustion-supporting air preheating device provided by the application has the following beneficial effects:

[0024] I. Through the combined power transmission of the driving gear and the U-shaped transmission member, the threaded propulsion shaft can be used as the rotation driving component and the sliding driving component of the annular wire brush at the same time, has the effect of one or two uses, which makes the rotation driving and sliding driving operations of the annular wire brush can be synchronously driven and executed by the threaded propulsion shaft, can save the need to configure driving components for the two driving operations respectively, and also can make the two driving operations share one driving unit for driving the threaded propulsion shaft, which helps to simplify the structure of the preheating device and reduce its cost to a certain extent; the two annular wire brushes can be driven to rotate and wipe at the same time, and the two annular wire brushes can be driven to slide and wipe under the combined action of the two different wiping cleaning actions, so that the threaded propulsion shaft and the preheating pipe can be cleaned in all directions, completely and effectively.

[0025] II. The two annular wire brushes, the gear ring, the retaining ring, and the driving gear and the U-shaped transmission member jointly form a wiping cleaning mechanism, which is arranged in the preheating box, and only needs to rotate the threaded propulsion shaft to drive the mechanism to clean the preheating pipe in the preheating box, which can save the trouble of disassembling the preheating device to expose the preheating pipe for cleaning, and is simple and efficient to operate and use.

[0026] III. In the initial and idle state, the scraping cleaning mechanism is located as shown in the figure, when the scraping cleaning mechanism is placed in the position, it is close to a short side plate wall of the preheating box, and deviates from the main air duct of the blowing and heating of the high-temperature flue gas to the preheating pipe, and the effect of the blowing and heating airflow generated by the high-temperature flue gas flowing in the preheating box is small; the scraping cleaning mechanism is designed reasonably, compactly and with high integration; the compact design of the scraping cleaning mechanism in the idle state can effectively reduce the interference effect of the blowing and heating airflow in the preheating box in the normal use state, ensure the covering blowing and heating effect of the blowing and heating airflow on the preheating pipe, and ensure the preheating and heating performance of the preheating device for the combustion-supporting air.

[0027] IV. Through the sliding fit of two key grooves and two key strips and the blocking and limiting of the U-shaped transmission part to the driving gear, the driving gear can slide synchronously with the U-shaped transmission part and always keep transmission connection with the threaded advancing shaft and the driving gear ring in the process of advancing the driving ring-shaped steel wire brush sliding cleaning, the continuous power coupling of the threaded advancing shaft and the driving gear ring, so that the threaded advancing shaft can continuously and effectively drive the driving gear ring and the ring-shaped steel wire brush to rotate synchronously, which helps to ensure the normal and effective implementation of the synchronous driving function of the threaded advancing shaft. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments will be briefly introduced below.

[0029] The drawings described below only relate to some embodiments of the present application, but not limit the present application.

[0030] In the drawings:

[0031] Figure 1 The overall structure schematic diagram of the present application is shown;

[0032] Figure 2 The overall bottom side view schematic diagram of the present application is shown;

[0033] Figure 3 The bottom side view schematic diagram of the preheating box inside the present application is shown;

[0034] Figure 4 The internal structure schematic diagram of the preheating box in the present application is shown;

[0035] Figure 5 The connection assembly schematic diagram of the synchronous chain and the driving sprocket and the guide sprocket in the present application is shown;

[0036] Figure 6 The meshing transmission schematic diagram of the driving gear and the gear ring in the present application is shown;

[0037] Figure 7The relative position relation diagram of the annular steel wire brush, the preheating pipe and the threaded propelling shaft in the present application is shown.

[0038] Figure 8 The half-section internal structure diagram of the circular loading sleeve in the present application is shown.

[0039] Figure 9 The enlarged structure diagram of the A part in the present application is shown. Figure 3

[0040] Figure 10 The half-section structure diagram of the retaining ring and the gear ring in the present application is shown.

[0041] List of reference signs:

[0042] 1. Preheating box; 101, U-shaped support; 102, conical ash collecting cover; 1021, ash discharging pipe; 1022, cover plate; 103, threaded propelling shaft; 1031, driving sprocket; 1032, key groove; 1033, driving gear; 1034, key; 104, vertically placed guide shaft; 105, circular loading sleeve; 106, wheel shaft; 1061, guide sprocket; 107, threaded driving shaft; 108, pressing ring; 1081, threaded shaft sleeve;

[0043] 2. Conical diffusing cover; 201, air inlet pipe;

[0044] 3. Conical ash collecting cover; 301, air outlet pipe;

[0045] 4. Driving assembly;

[0046] 5. Preheating pipe;

[0047] 6. Retaining ring; 601, U-shaped transmission member; 6011, shaft sleeve; 6012, transmission plate; 6013, limiting baffle;

[0048] 7. Gear ring; 701, annular steel wire brush; 702, retaining ring;

[0049] 8. Synchronous chain;

[0050] 9. Packing;

[0051] 10. Electric control box;

[0052] 11. Conical ash collecting cover; 1101, ash outlet pipe;

[0053] 12. Conical ash diffusing cover; 1201, ash inlet pipe. DETAILED DESCRIPTION

[0054] ​In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions will be described clearly and completely below with reference to the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without any inventive effort fall within the protection scope of the present application.

[0055] The following is an embodiment provided by the present application, please refer to Figures 1 to 10 :

[0056] The embodiment provides an annealing furnace combustion air preheating device, which comprises a preheating box 1, a plurality of rows of preheating pipes 5 are fixed in the preheating box 1 in the form of equidistant spacing from top to bottom;

[0057] A threaded propelling shaft 103 is rotationally arranged at a position close to the leeward side of the preheating pipe 5 in the preheating box 1, and a vertical guide shaft 104 is parallelly welded at a position close to the threaded propelling shaft 103 in the preheating box 1; a retaining ring 6 is slidably sleeved on the preheating pipe 5, a gear ring 7 is rotationally installed on the retaining ring 6, and a retaining ring 702 is welded on the gear ring 7 in a concentric manner; two annular steel wire brushes 701 with different diameters are fixed to the inner and outer circumferences of the retaining ring 702 respectively, the bristles on the inner annular steel wire brush 701 are uniformly distributed on the inner circumference of the supporting ring, and the bristles on the outer annular steel wire brush 701 are uniformly distributed on the outer circumference of the supporting ring; a U-shaped transmission member 601 is fixed to the retaining ring 6, the U-shaped transmission member 601 is composed of a shaft sleeve 6011 and transmission plates 6012 and limiting baffle plates 6013 integrally formed at both ends of the shaft sleeve 6011, the threaded propelling shaft 103 is threadedly engaged with the transmission plates 6012, and the shaft sleeve 6011 is slidably matched with the vertical guide shaft 104; a driving gear 1033 is slidably installed on the threaded propelling shaft 103, two symmetrically arranged key strips 1034 are integrally formed on the inner circumference of the shaft hole of the driving gear 1033, two key grooves 1032 are symmetrically formed on the outer circumference of the threaded propelling shaft 103, and the two key strips 1034 are slidably matched with the two key grooves 1032 correspondingly; the driving gear 1033 is in meshing transmission with the gear ring 7.

[0058] Preferably, the bristles on the inner annular steel wire brush 701 are in wiping contact with the outer circumference of the retaining ring 6, and the bristles on the outer annular steel wire brush 701 are in wiping contact with the threaded propelling shaft 103.

[0059] Preferably, the retaining ring 6 has an L-shaped cross-section structure, and the inner diameter of the retaining ring 6 is greater than the outer diameter of the preheating pipe 5; the two ends of the preheating pipe 5 are respectively through-welded with the two short side walls of the preheating box 1; an annular track groove is formed in the inner circumference of the gear ring 7, and the gear ring 7 is rotationally assembled with the retaining ring 6 through the annular track groove.

[0060] Preferably, the first end of the transmission plate 6012 is welded and fixed to the outer periphery of the retaining ring 6; the first end of the limiting baffle 6013 is provided with a crescent-shaped groove, which is in sliding cooperation with the threaded advancing shaft 103, and between the two.

[0061] Preferably, the two ends of the threaded advancing shaft 103 are respectively in rotational cooperation with the two short side walls of the preheating box 1, one end of the threaded advancing shaft 103 protruding from the preheating box 1 is fixedly sleeved with a driving sprocket 1031, and the driving sprocket 1031 is installed with a synchronous chain 8; the outer side of one short side wall of the preheating box 1 is welded with a plurality of wheel shafts 106, the first end of each wheel shaft 106 is fixedly sleeved with a guide sprocket 1061, and the synchronous chain 8 is sequentially threaded through all the driving sprockets 1031 and guide sprockets 1061 and is in meshing cooperation with all the driving sprockets 1031 and guide sprockets 1061; the guide sprockets 1061 are distributed on the transmission path of the synchronous chain 8 and can cover the synchronous chain 8 on the driving sprocket 1031.

[0062] Preferably, the outer side of one short side wall of the preheating box 1 is welded with a circular loading sleeve 105 at a position around the threaded advancing shaft 103, the circular loading sleeve 105 is concentrically arranged with the threaded advancing shaft 103, the circular loading sleeve 105 is filled with a coiled packing 9, the inner periphery of the coiled packing 9 is in extrusion contact with the part of the threaded advancing shaft 103 protruding from the preheating box 1; the outer side of one short side wall of the preheating box 1 is symmetrically rotationally connected with two threaded drive shafts 107 at a position around the circular loading sleeve 105, the circular loading sleeve 105 is slidably inserted with a pressing ring 108, the pressing ring 108 is in abutting contact with the coiled packing 9, and the outer periphery of the pressing ring 108 is symmetrically welded with two threaded shaft sleeves 1081, and the two threaded drive shafts 107 are in threaded and screwed cooperation with the two threaded shaft sleeves 1081.

[0063] Preferably, the two ends of the preheating box 1 are respectively fixedly connected with a conical diffusion cover 2 and a conical gas collecting cover 3, the conical diffusion cover 2 is fixedly suspended with a driving assembly 4 inside, the driving assembly 4 is composed of a servo motor and a speed reducer, and the power output shaft of the speed reducer is connected with the corresponding threaded advancing shaft 103 through a shaft coupling.

[0064] Preferably, the two ends of the preheating pipe 5 are respectively covered in the conical diffusion cover 2 and the conical gas collecting cover 3, the first end of the conical diffusion cover 2 and the conical gas collecting cover 3 is respectively welded with an air inlet pipe 201 and an air outlet pipe 301, and the air outlet pipe 301 is connected with a blower of the annealing furnace through an external pipeline.

[0065] The outer side of the conical diffusion cover 2 is fixedly installed with an electric control box 10, the electric control box 10 is provided with a servo driver, and the servo driver is electrically connected with the servo motor.

[0066] Preferably, the two long side walls of the preheating box 1 are respectively welded with a conical smoke collecting cover 11 and a conical smoke expanding cover 12 which are arranged in communication with the two long side walls, the leading ends of the conical smoke collecting cover 11 and the conical smoke expanding cover 12 are respectively welded with a smoke outlet pipe 1101 and a smoke inlet pipe 1201, the smoke outlet pipe 1101 is connected with a subsequent flue gas treatment process through an external pipeline, and the smoke inlet pipe 1201 is connected with a flue of an annealing furnace through an external pipeline; the bottom of the preheating box 1 is welded with a conical ash collecting cover 102, the bottom of the conical ash collecting cover 102 is welded with an ash discharge pipe 1021, the bottom ash discharge opening of the ash discharge pipe 1021 is covered with a cover plate 1022, and the bottom of the preheating box 1 is symmetrically welded with two U-shaped supports 101.

[0067] The specific details, implementation steps, functions and mutual relationships of the features, and the roles of the features in the implementation of the technical solution of the above-mentioned embodiments are described and explained in detail as follows:

[0068] In use, the high-temperature flue gas in the flue of the annealing furnace is transported into the preheating box 1 through the smoke inlet pipe 1201 and the conical smoke expanding cover 12 in sequence by an induced draft fan of the annealing furnace via an external pipeline between the smoke inlet pipe 1201 and the flue, and the combustion-supporting air in the external environment is transported into the annealing furnace by a blower of the annealing furnace in sequence through the air inlet pipe 201, the conical diffusion cover 2, the multiple rows of preheating pipes 5, the conical air collecting cover 3, the air outlet pipe 301, an external pipeline between the air outlet pipe 301 and the blower, and the blower, the high-temperature flue gas is circulated towards the conical smoke collecting cover 11 after being transported into the preheating box 1, and in turn blows and heats the multiple rows of preheating pipes 5, the combustion-supporting air flowing through the multiple rows of preheating pipes 5 is preheated and heated, and is then transported into the annealing furnace for fuel combustion, the preheated and heated combustion-supporting air can improve the combustion efficiency of the fuel, achieve the combustion-supporting effect, the temperature of the high-temperature flue gas blowing through the multiple rows of preheating pipes 5 is reduced after being absorbed and utilized by the combustion-supporting air, the low-temperature flue gas after being utilized is in turn transported into a subsequent flue gas treatment process through the conical smoke collecting cover 11, the smoke outlet pipe 1101, and an external pipeline between the smoke outlet pipe 1101 and the flue gas treatment process, and is discharged after being purified in the flue gas treatment process.

[0069] After a long time of use, the dust in the high-temperature flue gas will accumulate and adhere to the thread grooves of the threaded advancing shaft 103 and the outer circumferential surface of the preheating pipe 5, the dust adhering to the thread grooves of the threaded advancing shaft 103 will block the thread grooves, affect the normal implementation of the advancing and driving function of the threaded advancing shaft 103, and cause the advancing and driving function to be stuck or even fail, and the dust adhering to the outer circumferential surface of the preheating pipe 5 will have a heat insulation effect, affect the preheating and heating effect of the high-temperature flue gas on the combustion-supporting air, and thus the dust on the threaded advancing shaft 103 and the preheating pipe 5 needs to be cleaned regularly.

[0070] When the threaded propulsion shaft 103 is driven in reverse, the two annular wire brushes 701 can be driven to rotate in reverse synchronously around the preheating pipe 5 through the meshing transmission between the driving gear 1033 and the gear ring 7, and the dust accumulated on the threaded propulsion shaft 103 and the preheating pipe 5 can be brushed and cleaned at the same time. This can save the trouble of cleaning the threaded propulsion shaft 103 and the preheating pipe 5 in steps, and is simple and convenient to operate and saves time; while the threaded propulsion shaft 103 rotates to drive the annular wire brushes 701, it can also drive the U-shaped transmission member 601 to slide back and forth along the longitudinally arranged guide shaft 104, and control the ring 6, the gear ring 7 and the annular wire brush 701 to slide back and forth along the preheating pipe 5, so as to clean the dust on the preheating pipe 5 and the threaded propulsion shaft 103 comprehensively. In this way, through the combined power transmission of the driving gear 1033 and the U-shaped transmission member 601, the threaded propulsion shaft 103 can be used as a rotating driving part and a sliding driving part of the annular wire brush 701 at the same time, which has a dual-use effect. This effect enables the rotating driving and sliding driving operations of the annular wire brush 701 to be performed synchronously by driving the threaded propulsion shaft 103, which can save the need to configure driving parts for the two driving operations respectively, and also enables the two driving operations to be performed by a driving unit that drives the threaded propulsion shaft 103, which helps to simplify the structure of the preheating device to some extent and reduce its cost; while the two annular wire brushes 701 are driven to rotate and sweep, they can also be driven to slide and sweep. Under the combined action of the two different forms of sweeping and cleaning operations, the two annular wire brushes 701 can clean the threaded propulsion shaft 103 and the preheating pipe 5 comprehensively, completely and effectively; the two annular wire brushes 701, the gear ring 7, the retaining ring 6, the driving gear 1033 and the U-shaped transmission member 601 together form a sweeping and cleaning mechanism, which is arranged inside the preheating box 1. Only the threaded propulsion shaft 103 needs to be rotated to drive the mechanism to clean the preheating pipe 5 in the preheating box 1, which can save the trouble of disassembling the preheating device to expose the preheating pipe 5 for cleaning, and is simple and efficient to operate and use.

[0071] Because the drive gear 1033 slides with the threaded propulsion shaft 103 but does not thread-mesh with it, and the threaded propulsion shaft 103 drives the drive gear 1033 through the sliding engagement of two keyways 1032 and two key bars 1034, and the drive gear 1033 is blocked and limited between the transmission plate 6012 and the limiting baffle 6013, when the threaded propulsion shaft 103 pushes the drive gear ring 7 and the annular wire brush 701 along the preheating pipe 5 through the U-shaped transmission member 601, it can also push the drive gear 1033 to slide along the threaded propulsion shaft 103, so that the drive gear 1033 always remains in the state of meshing with the drive gear ring 7. At the same time, when the drive gear 1033 is driven to slide, the two key bars 1034 can slide along the two keyways 1032 and 6013. 2. Sliding ensures that the drive gear 1033 and the threaded propulsion shaft 103 remain in a constant power connection. Through the sliding engagement of the two keyways 1032 and two key bars 1034, and the blocking and limiting action of the drive gear 1033 by the U-shaped transmission component 601, the drive gear 1033 can slide synchronously with the U-shaped transmission component 601 during the sliding cleaning process of the threaded propulsion shaft 103 driving the annular wire brush 701. It maintains a constant transmission connection with the threaded propulsion shaft 103 and the drive gear ring 7, continuously coupling power between them. This ensures that the threaded propulsion shaft 103 can continuously and effectively drive the drive gear ring 7 and the annular wire brush 701 to rotate synchronously during this process. This helps ensure the normal and effective implementation of the synchronous drive function of the threaded propulsion shaft 103.

[0072] In the initial and idle states, the sweeping and cleaning mechanism is located as follows: Figure 3 As shown, when the sweeping and cleaning mechanism is placed in this position, it is close to a short side wall of the preheating box 1 and is away from the main air duct for the high-temperature flue gas to blow and heat the preheating pipe 5. This results in a smaller turbulence effect on the blowing and heating airflow generated by the high-temperature flue gas flowing inside the preheating box 1. The sweeping and cleaning mechanism is reasonably designed, compact, and highly integrated. The compact and small size of the sweeping and cleaning mechanism, combined with its suitable placement in the idle state, can effectively reduce the turbulence interference effect on the blowing and heating airflow inside the preheating box 1 under normal use, ensuring the covering and blowing heating effect of the blowing and heating airflow on the preheating pipe 5, and guaranteeing the preheating performance of the preheating device for the combustion air.

[0073] The servo motor can use a reducer to drive the threaded drive shaft 103, which is connected to the drive assembly 4 via a coupling. The threaded drive shaft 103 can drive all the threaded drive shafts 103 synchronously through the drive sprocket 1031 and the synchronous chain 8. In this way, the drive assembly 4 can drive all the threaded drive shafts 103 synchronously.

[0074] The packing 9 can seal the rotating gap between the threaded advancing shaft 103 and the short side wall of the preheating box 1, so as to avoid that the dust in the high-temperature flue gas circulating in the preheating box 1 leaks into the conical diffusion cover 2 through the gap, and then flows into the preheating pipe 5 under the entrainment of the combustion air flow in the conical diffusion cover 2, and adheres to the inner wall of the preheating pipe 5 to generate a heat insulation effect, thereby reducing the heat conduction efficiency of the preheating pipe 5. Simultaneous rotation of the two threaded drive shafts 107 can drive the top pressing ring 108 to slide towards the packing 9, so as to adjust and compress the loose packing 9.

[0075] The driving assembly 4 is arranged inside the conical diffusion cover 2, and can be cooled by the relatively low-temperature combustion air sucked into the conical diffusion cover 2 from the external environment. This can keep the driving assembly 4 at a suitable and relatively low working temperature in the high-temperature working condition close to the preheating box 1, so as to reduce the risk of overheating and burning of the driving assembly 4, and prolong the service life of the driving assembly 4.

[0076] It is worth noting that dust will also accumulate in the key groove 1032, and the dust in the key groove 1032 also needs to be cleaned to ensure the smooth sliding of the driving gear 1033 and the key bar 1034. Since the key bar 1034 is relatively wide, part of the dust in the key bar 1034 will fall out by gravity when the threaded advancing shaft 103 is rotated to the state that the opening faces downward. In addition, the dust in the key bar 1034 can be effectively removed under the triple effects of the gravity falling cleaning effect, the scraping cleaning effect and the scraping cleaning effect of the outer annular steel wire brush 701, so that the smooth sliding of the driving gear 1033 and the key bar 1034 can be ensured.

[0077] There is a gap between the retaining ring 6 and the preheating pipe 5, which can avoid the direct sliding contact between the retaining ring 6 and the preheating pipe 5, prevent the dust adhered to the outer wall of the preheating pipe 5 from being stuck in the sliding gap between the retaining ring 6 and the preheating pipe 5, and cause the sliding jam of the retaining ring 6.

[0078] The gap between the crescent-shaped groove and the threaded advancing shaft 103 can avoid the direct sliding contact between the limiting baffle 6013 and the threaded advancing shaft 103, and cause excessive wear.

[0079] The working principle of the preheating pipe 5 cleaning operation: in the idle state, the annular steel wire brush 701 is located on the first end portion of the preheating pipe 5, and when the dust is cleaned, the servo motor is first started, the servo motor drives the threaded advancing shaft 103 to rotate forward, the advancing control annular steel wire brush 701 slides along the preheating pipe 5 towards the direction away from the driving assembly 4, and the threaded advancing shaft 103 and the preheating pipe 5 are cleaned once, through the accurate control of the servo driver, the servo motor can accurately rotate forward for a predetermined number of turns to drive the annular steel wire brush 701 to slide to the tail end portion of the preheating pipe 5 (at this time, the annular steel wire brush 701 is close to the short side wall of the preheating box 1 away from the driving assembly 4, and the cleaning of the preheating pipe 5 is completed), the direction of the servo motor is switched and the servo motor is controlled to reverse, when the servo motor reverses, the annular steel wire brush 701 driven by the servo motor slides towards the driving assembly 4, and the preheating pipe 5 is cleaned again, through the accurate control of the servo driver, the servo motor can accurately reverse for a predetermined number of turns to drive the annular steel wire brush 701 to slide to the first end portion of the preheating pipe 5, the servo motor is turned off, and the annular steel wire brush 701 is restored to the idle state, and thus the whole process of the preheating pipe 5 cleaning operation is completed.

[0080] It is worth noting that the selection and adaptation of the model of the servo driver and the servo motor, the connection mode between the two, and the control principle of the servo driver to the servo motor belong to the prior art for those engaged in the automation of equipment, design and maintenance in the field, and therefore will not be described here.

[0081] It is worth noting that the two long side walls of the preheating box 1 are detachably arranged, and when they are removed, the two openings on the preheating box 1 closed and blocked by them can be opened to replace the annular steel wire brush 701 or remove the jamming fault of the driving gear 1033 and the gear ring 7 if necessary.

[0082] In this paper, the following points need attention:

[0083] 1. The drawings of the embodiments of the present application only involve the structures involved in the embodiments of the present application, and other structures can refer to the usual design.

[0084] 2. In the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined to obtain new embodiments.

[0085] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An annealing furnace combustion air preheating device, comprising a preheating box (1), wherein multiple rows of preheating pipes (5) are fixedly connected inside the preheating box (1); Its features are, Inside the preheating box (1), near the leeward side of the preheating pipe (5), a threaded propulsion shaft (103) is rotatably installed. Inside the preheating box (1), near the threaded propulsion shaft (103), a longitudinally placed guide shaft (104) is welded parallel. A retaining ring (6) is slidably fitted on the preheating pipe (5). A gear ring (7) is rotatably installed on the retaining ring (6). A retaining ring (702) is welded on the gear ring (7). Two annular wire brushes (701), one large and one small, are fixed to the inner and outer circumferences of the retaining ring (702). The brush filaments on the inner annular wire brush (701) are evenly distributed on the inner circumference of its supporting ring, and the brush filaments on the outer annular wire brush (701) are evenly distributed on the outer circumference of its supporting ring. A U-shaped transmission component (601) is fixedly connected to the retaining ring (6). The U-shaped transmission component (601) is connected to the bushing (6011). The transmission plate (6012) and the limiting baffle (6013) integrally formed at both ends of the bushing (6011) are together. The threaded push shaft (103) is threaded and meshes with the transmission plate (6012). The bushing (6011) is slidably fitted with the longitudinal guide shaft (104). A drive gear (1033) is slidably mounted on the threaded push shaft (103). Two key strips (1034) are integrally formed on the inner circumference of the shaft hole of the drive gear (1033). Two keyways (1032) are opened on the outer circumference of the threaded push shaft (103). The two key strips (1034) are slidably fitted with the two keyways (1032). The drive gear (1033) meshes with the gear ring (7) for transmission. The drive gear (1033) is limited between the transmission plate (6012) and the limiting baffle (6013). The bristles on the inner annular wire brush (701) are in rubbing contact with the outer periphery of the retaining ring (6), and the bristles on the outer annular wire brush (701) are in rubbing contact with the threaded push shaft (103). The retaining ring (6) has an L-shaped cross-section structure, and the inner diameter of the retaining ring (6) is larger than the outer diameter of the preheating pipe (5); the two ends of the preheating pipe (5) are respectively welded through to the two short side walls of the preheating box (1); the toothed ring (7) has an annular track groove on its inner circumference, and the toothed ring (7) is rotated and assembled with the retaining ring (6) through the annular track groove. A circular loading sleeve (105) is welded to the outer side of a short side wall of the preheating box (1) around the threaded propulsion shaft (103). The circular loading sleeve (105) is concentrically arranged with the threaded propulsion shaft (103). The circular loading sleeve (105) is filled with a coiled packing (9). The inner circumference of the packing (9) is in contact with the part of the threaded propulsion shaft (103) that protrudes from the preheating box (1).

2. The annealing furnace combustion air preheating device according to claim 1, characterized in that, The first end of the transmission plate (6012) is welded and fixed to the outer periphery of the retaining ring (6); The first end of the limiting baffle (6013) is provided with a crescent-shaped groove, which slides with the threaded push shaft (103) and maintains a gap between them.

3. The annealing furnace combustion air preheating device according to claim 1, characterized in that, The two ends of the threaded propulsion shaft (103) are respectively rotatably engaged with the two short side walls of the preheating box (1). A drive sprocket (1031) is fixedly mounted on one end of the threaded propulsion shaft (103) that protrudes from the preheating box (1). A synchronous chain (8) is installed on the drive sprocket (1031). The preheating box (1) has multiple axles (106) welded to the outer side of a short side wall. Each axle (106) has a guide sprocket (1061) fixedly fitted at its head end. The synchronous chain (8) passes through all the drive sprockets (1031) and guide sprockets (1061) in sequence and meshes with all the drive sprockets (1031) and guide sprockets (1061). The guide sprocket (1061) is located on the transmission path of the synchronous chain (8) and can pull the synchronous chain (8) onto the drive sprocket (1031).

4. The annealing furnace combustion air preheating device according to claim 1, characterized in that, Two threaded drive shafts (107) are symmetrically rotatably connected to the outer side of a short side wall of the preheating box (1) around the circular loading sleeve (105). A top pressure ring (108) is slidably inserted in the circular loading sleeve (105). The top pressure ring (108) is in pressure contact with the packing (9). Two threaded bushings (1081) are symmetrically welded to the outer circumference of the top pressure ring (108). The two threaded drive shafts (107) are threaded and meshed with the two threaded bushings (1081) through the threaded shafts.

5. The combustion air preheating device for an annealing furnace according to claim 1, characterized in that, The preheating box (1) is fixedly connected to a conical diffuser (2) and a conical gas-gathering hood (3) at both ends. A drive assembly (4) is fixedly installed inside the conical diffuser (2). The drive assembly (4) is composed of a servo motor and a reducer. The power output shaft of the reducer is connected to the threaded propulsion shaft (103) at the corresponding position through a coupling.

6. The annealing furnace combustion air preheating device according to claim 5, characterized in that, The two ends of the preheating pipe (5) are respectively covered in the conical diffuser (2) and the conical gas gathering hood (3). The first ends of the conical diffuser (2) and the conical gas gathering hood (3) are respectively welded with an air inlet pipe (201) and an air outlet pipe (301). The air outlet pipe (301) is connected to the blower of the annealing furnace through an external pipe. An electrical control box (10) is fixedly installed on the outside of the conical diffuser (2). A servo driver is installed in the electrical control box (10), and the servo driver is electrically connected to the servo motor.

7. The annealing furnace combustion air preheating device according to claim 1, characterized in that, The two long side walls of the preheating box (1) are respectively welded with a conical smoke hood (11) and a conical smoke diffuser (12) connected to it. The first ends of the conical smoke hood (11) and the conical smoke diffuser (12) are respectively welded with a smoke outlet pipe (1101) and a smoke inlet pipe (1201). The smoke outlet pipe (1101) is connected to the subsequent flue gas treatment process through an external pipe, and the smoke inlet pipe (1201) is connected to the chimney of the annealing furnace through an external pipe. The bottom of the preheating box (1) is welded with a conical ash hood (102), the bottom of the conical ash hood (102) is welded with an ash discharge pipe (1021), the bottom ash discharge port of the ash discharge pipe (1021) is covered with a cover plate (1022), and two scalloped supports (101) are symmetrically welded to the bottom of the preheating box (1).

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