A device for preventing nodule formation on the roller surface of a strip steel annealing furnace roller

Abstract

The present invention discloses a device for preventing nodules on the roller surface of a strip annealing furnace, including an annealing furnace, wherein the annealing furnace includes a preheating zone, a heating zone and a uniform cooling zone that are connected to each other, and also includes a dew reduction mechanism, which respectively includes: an air collecting cone cover, which is respectively covered on the top of the heating zone and the preheating zone; an air compressor unit, whose input end is fixedly connected to the air collecting cone cover; a filter plate, which is arranged at the output end of the air compressor unit; and a first compressed air pipe, on which a return bend portion located in the preheating zone is arranged. Specifically, it relates to continuous annealing furnace equipment. The invention uses an air compressor unit to suck the airflow at the top of the heating zone and the preheating zone, and then compresses it after suction to increase the pressure, press out the moisture in the protective gas, and the filter plate filters the moisture. The filtered low dew point gas will be re-input into the annealing furnace for use to reduce the gas dew point of the preheating zone and the uniform cooling zone, thereby achieving nodule prevention.

Description

Technical Field

[0001] The invention relates to the technical field of strip steel heat treatment, in particular to a device for preventing nodules on the roller surface of a furnace roller in a strip steel annealing furnace. Background Art

[0002] Strip annealing furnace, usually a continuous annealing furnace, is a continuous heat treatment equipment. The annealing furnace is unsealed, and the strip can run without stopping, which speeds up production.

[0003] According to patent number CN104232877A, published (announced) date: 2014-12-24, a strip steel annealing furnace roller surface anti-nodulation device is disclosed, which belongs to strip steel heat treatment equipment, especially to strip steel continuous annealing furnace. The characteristic is that the nitrogen delivery pipe is provided with an air inlet pipeline, and the outlet end of the air inlet pipeline is connected to a nitrogen humidifying device by a nitrogen air inlet valve, a pressure reducing valve, a moisture regulating valve, and a dry gas regulating valve. The nitrogen humidifying device is connected to a moisture nozzle at the bottom of the annealing furnace soaking section by a moisture inlet regulating valve and an injection pipeline, and the air inlet pipeline, the nitrogen humidifying device, the injection pipeline and the annealing furnace form a gas passage. The advantage is that the dew point of the atmosphere in the soaking section of the annealing furnace of the device is -27℃~-35℃, and the gas particles with high dew point are first enriched in the roughness valley points of the non-strip contact surface of the furnace roller, and then wrapped by the high-temperature strip steel from the heating section. The gas particles expand due to the heat, which effectively prevents the sponge iron on the strip steel from sticking to the furnace roller to form nodules, thereby improving product quality, reducing the number of times the furnace is opened and rollers are replaced, reducing spare parts costs and production costs, and improving product yield and unit operation rate.

[0004] In the prior art including the above-mentioned patent, furnace rollers are provided in the strip annealing furnace to transport and move the strip so as to move it in multiple areas of the continuous annealing furnace. During the movement, the strip will produce flaky impurities (iron oxide scale) due to friction with the furnace rollers in a high temperature environment. When the dew point (humidity in the gas) of the protective gas in the annealing furnace rises, the flaky impurities are easily adhered to the surface of the furnace rollers due to the adhesion medium (water generated due to the increase in humidity) to form nodules, thereby causing abnormal conditions in the strip. Summary of the invention

[0005] The purpose of the present invention is to provide a device for preventing nodules on the roller surface of a strip steel annealing furnace roller, aiming to solve the problem of nodules on the roller surface of the furnace roller caused by the increase of the dew point of the protective gas.

[0006] In order to achieve the above-mentioned object, the present invention provides the following technical solution: a device for preventing nodules on the roller surface of a strip steel annealing furnace roller, comprising an annealing furnace, wherein the annealing furnace comprises a preheating zone, a heating zone and a uniform cooling zone connected to each other, and also comprises a dew reduction mechanism, which respectively comprises:

[0007] The air collecting cone cover is respectively arranged on the top of the heating zone and the preheating zone;

[0008] An air compression unit, the input end of which is fixedly connected to the air collecting cone cover;

[0009] A filter plate, which is arranged at the output end of the compressed air unit;

[0010] A first compressed air pipe, on which a return bend is provided in the preheating zone, and two ends of the first compressed air pipe are respectively fixedly connected to the output end of the compressed air unit and fixedly connected to the top of the uniform cooling zone;

[0011] The second compressed air pipe has two ends respectively connected to the output end of the compressed air unit and fixedly connected to the bottom of the heating area.

[0012] Preferably, a dirt isolation mechanism is further included, which includes a dirt bottom frame arranged at the bottom of the annealing furnace and a bearing cover connected to the dirt bottom frame, and a blocking slide is arranged on the bearing cover, and the blocking slide intermittently reciprocates to isolate the bearing cover and the dirt bottom frame.

[0013] Preferably, a pressure chamber is clamped between the bearing cover, the bottom of the annealing furnace and the first end of the blocking slide, a first spring is arranged between the second end of the blocking slide and the bearing cover, and a third compressed air pipe is fixedly connected between the pressure chamber and the compressed air unit.

[0014] Preferably, the output end of the air compression unit is fixedly connected to a travel chamber, and the air compression unit intermittently supplies air to the travel chamber, and the travel chamber is assembled at the following three stations:

[0015] First station: the travel chamber is connected with the first compressed air pipe and the second compressed air pipe during inflation;

[0016] Second working position: the travel chamber maintains the first working position and is fixedly connected to the third compressed air pipe to inflate the pressure chamber and push it against the blocking slide plate;

[0017] The third workstation: the travel chamber is disconnected from the first compressed air pipe, the second compressed air pipe and the third compressed air pipe.

[0018] Preferably, the third compressed air pipe is fixedly connected to an air guide support rod, and the air guide support rod is slidably connected to an air slide plate that adheres to the inner wall of the travel chamber, an air groove is opened at the first end of the air guide support rod, and a second spring is arranged along the diagonal between the air slide plate and the compressed air unit.

[0019] Preferably, the second compressed air pipe is fixedly connected with two opposite air outlets, and the dirty bottom frame is symmetrically provided with guide inclined plates, which discharge materials toward the bearing cover as the air outlets vibrate.

[0020] Preferably, a cooling pipe is fixedly connected to the bottom of the heating zone and the bottom of the uniform cooling zone.

[0021] Preferably, the gas outlet is driven to discharge gas and suck the gas in the heating zone to mix, and the mixed gas is input into the heating zone and the uniform cooling zone respectively.

[0022] Preferably, the air outlet is sleeved with an air guide cylinder fixedly connected to the heating zone, a gas mixing frame is provided in the heating zone, the gas mixing frame is symmetrically provided with oblique grooves, and the oblique grooves correspond to the air outlets one by one.

[0023] Preferably, the air mixing frame is fixedly connected to the cooling pipe, air collecting frames are respectively provided at both ends of the air mixing frame, and a blocking plate is provided on the guide inclined plate, and the blocking plate is driven to bend and guide the airflow into the air collecting frame.

[0024] In the above technical scheme, the present invention provides a device for preventing nodules on the roller surface of a strip annealing furnace roller, which has the following beneficial effects: the airflow at the top of the heating zone and the preheating zone is sucked by the air compression unit, and then compressed after suction to increase the pressure, so as to press out the moisture in the protective gas, and the moisture is filtered by the filter plate. The filtered low dew point gas will be re-input into the annealing furnace for use to reduce the gas dew point in the preheating zone and the uniform cooling zone, thereby achieving nodule prevention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0026] Figure 1 An overall schematic diagram provided for an embodiment of the present invention;

[0027] Figure 2 An overall explosion diagram provided for an embodiment of the present invention;

[0028] Figure 3 A transparent schematic diagram of an annealing furnace and a first compressed air pipe provided in an embodiment of the present invention;

[0029] Figure 4 A cross-sectional schematic diagram of a travel chamber and a dew reduction mechanism provided in an embodiment of the present invention;

[0030] Figure 5 for Figure 4 The enlarged schematic diagram at A in the middle;

[0031] Figure 6 A schematic diagram of the partial structural position of the dew-reducing mechanism provided in an embodiment of the present invention;

[0032] Figure 7 An explosion schematic diagram of a dirt isolation mechanism provided by an embodiment of the present invention;

[0033] Figure 8 An exploded schematic diagram of a gas mixing frame and pipelines provided in an embodiment of the present invention;

[0034] Fig. 9 for Figure 8 The enlarged schematic diagram of point B in the middle;

[0035] Fig.10 A schematic cross-sectional view of a gas mixing frame and a pipeline provided in an embodiment of the present invention;

[0036] Fig.11 for Fig.10 Enlarged schematic diagram at point C in the middle.

[0037] Description of reference numerals:

[0038] 1. Annealing furnace; 10. End plate; 11. Preheating zone; 12. Heating zone; 13. Cooling zone; 14. Strip steel; 141. Furnace roller; 15. Dirt bottom frame; 2. Dew reduction mechanism; 20. Filter plate; 21. Compressed air unit; 22. Air collecting cone cover; 23. Air collecting pipe; 3. Dirt isolation mechanism; 31. Bearing cover; 32. Blocking slide plate; 321. Through groove; 322. First spring; 33. Guide inclined plate; 33 1. Receiving groove; 332. Blocking plate; 4. Travel chamber; 401. Gas guide support rod; 4011. Gas groove; 402. Gas slide plate; 4021. Second spring; 41. First compressed air pipe; 411. Return bend; 42. Second compressed air pipe; 421. Air outlet; 43. Third compressed air pipe; 51. Cooling pipe; 52. Gas cylinder; 53. Gas mixing frame; 531. Air collection frame; 532. Oblique groove. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0040] like Figure 1-11 As shown, a device for preventing nodules on the roller surface of a strip steel annealing furnace roller comprises an annealing furnace 1, wherein the annealing furnace 1 comprises a preheating zone 11, a heating zone 12 and a cooling zone 13 connected to each other, and also comprises a dew reduction mechanism 2, which comprises:

[0041] The air collecting cone cover 22 is respectively provided on the top of the heating zone 12 and the preheating zone 11;

[0042] The air compression unit 21, the input end of which is fixedly connected to the air collecting cone cover 22;

[0043] A filter plate 20, which is arranged at the output end of the air compression unit 21;

[0044] The first compressed air pipe 41 is provided with a return bend 411 located in the preheating zone 11, and both ends of the first compressed air pipe 41 are respectively fixedly connected to the output end of the compressed air unit 21 and the top of the uniform cooling zone 13;

[0045] The second compressed air pipe 42 has two ends connected to the output end of the compressed air unit 21 and fixedly connected to the bottom of the heating area 12 respectively.

[0046] Specifically, end plates 10 are provided at both ends of the annealing furnace 1, furnace rollers 141 are provided in the preheating zone 11, the heating zone 12 and the cooling zone 13, the strip steel 14 enters the annealing furnace 1 along the end plate 10 of the preheating zone 11, and meanders with the restriction of multiple furnace rollers 141 to increase the time of the strip steel 14 in the annealing furnace 1, and heating units (which can be natural gas heating or electric heating) are provided in the preheating zone 11 and the heating zone 12 to heat the strip steel 14 therein, and there are two air collecting cone covers 22, which are respectively provided on the top of the heating zone 12 and the preheating zone 11, and an air collecting pipe 23 is provided between the two air collecting cone covers 22, and the air collecting pipe 23 is fixedly connected to the input end of the air compression unit 21, so as to absorb the rising heat flow in the heating zone 12 and the preheating zone 11, The rising heat flow will carry the water vapor evaporated from the steel strip 14, and the dew point of this part of the gas will rise due to the fusion of the water vapor, and the inert gas carrying the water vapor will be sucked and compressed by the air compressor unit 21. At this time, the internal water vapor will condense into large particles of water vapor as it is compressed, so as to reach a size that can be intercepted by the filter plate 20. At this time, the water vapor in the compressed gas output by the air compressor unit 21 is intercepted and re-transported to the preheating zone 11 and the uniform cooling zone 13 for recycling, so as to avoid the continuous accumulation of water vapor leading to the increase of the dew point, thereby reducing the reaction between the steel strip 14 and the water vapor and the formation of an oxide layer on the surface. At the same time, the compressed gas will expand and absorb heat after entering the preheating zone 11 and the uniform cooling zone 13, thereby reducing the temperature of the preheating zone 11 and the uniform cooling zone 13 to meet the annealing requirements, and the auxiliary cooling equipment is used to cool the exhaust gas.

[0047] The first compressed air pipe 41 is provided with a bend portion 411, which is arranged in the preheating zone 11. The temperature of the preheating zone 11 needs to be higher than that of the uniform cooling zone 13, and the rising hot air in the preheating zone 11 will be continuously sucked by the air collecting cone 22, which may easily lead to the situation that the temperature of the preheating zone 11 is too low. The sucked gas will heat up after being compressed, so that the compressed gas moving along the first compressed air pipe 41 will pass through the bend portion 411, which will assist in heating the preheating zone 11 and reduce the burden on the heating unit.

[0048] Furthermore, the air compression unit 21 may adopt a heat-resistant booster pump or a heat-resistant air compressor, which can compress the gas and withstand the temperature when the gas is heated.

[0049] In the above technical solution, the air flow at the top of the heating zone 12 and the preheating zone 11 is sucked by the air compressor unit 21, and then compressed after suction to increase the pressure, squeeze out the moisture in the protective gas, and the moisture is filtered by the filter plate 20. The filtered low dew point gas will be re-input into the annealing furnace 1 for use to reduce the gas dew point of the preheating zone 11 and the uniform cooling zone 13, thereby achieving anti-nodulation.

[0050] As an embodiment provided by the present invention, it also includes a dirt isolation mechanism 3, which includes a dirt bottom frame 15 arranged at the bottom of the annealing furnace 1 and a bearing cover 31 connected to the dirt bottom frame 15, and a blocking slide 32 is arranged on the bearing cover 31, and the blocking slide 32 intermittently slides back and forth to isolate the bearing cover 31 and the dirt bottom frame 15.

[0051] Specifically, the blocking slide 32 is arranged between the dirty bottom frame 15 and the bearing cover 31. The blocking slide 32 includes two positions: extended and retracted. When extended, the blocking slide 32 isolates the bearing cover 31 and the dirty bottom frame 15. At this time, impurities dropped from the strip steel 14 will fall on the blocking slide 32. When the blocking slide 32 is retracted, the impurities fall into the bearing cover 31 and are blocked as the blocking slide 32 is reset to isolate the impurities in the bearing cover 31 from the dirty bottom frame 15, thereby preventing impurities with higher water content and lighter impurities from affecting the strip steel 14 in the heating zone 12 when heated.

[0052] During operation, the compressed air unit 21 draws the rising heat flow in the heating zone 12 and the preheating zone 11 and compresses it, so that the water vapor in the rising heat flow condenses into large particles of water vapor, which are intercepted and filtered by the filter plate 20. The filtered air flow is respectively re-delivered to the preheating zone 11 and the uniform cooling zone 13 through the first compressed air pipe 41 and the second compressed air pipe 42 for recycling. At the same time, the compressed gas will expand and absorb heat after entering the preheating zone 11 and the uniform cooling zone 13, reducing the temperature of the preheating zone 11 and the uniform cooling zone 13. When the strip steel 14 moves and is squeezed with the furnace roller 141, impurities will fall on the blocking slide 32, and as the blocking slide 32 intermittently slides back and forth, the impurities will fall into the bearing cover 31 and be isolated from the dirty bottom frame 15.

[0053] As an embodiment provided by the present invention, a pressure chamber is clamped between the bearing cover 31, the bottom of the annealing furnace 1 and the first end of the blocking slide 32, a first spring 322 is arranged between the second end of the blocking slide 32 and the bearing cover 31, and a third compressed air pipe 43 is fixedly connected between the pressure chamber and the compressed air unit 21.

[0054] Specifically, the first end of the blocking slide plate 32 (with Fig.11For reference, the first end is the left end, and the second end is the right end) The bottom of the annealing furnace 1 and the bearing cover 31 are clamped into a pressure chamber, and the third compressed air pipe 43 is fixedly connected to the pressure chamber. A through groove 321 is provided on the blocking slide 32. When the compressed air unit 21 inputs compressed gas to the pressure chamber through the third compressed air pipe 43, the blocking slide 32 slides along the bearing cover 31, so that the first spring 322 is compressed. At the same time, the through groove 321 moves to between the dirty bottom frame 15 and the bearing cover 31 for unloading. When the compressed air unit 21 stops supplying air, the compressed first spring 322 rebounds, driving the blocking slide 32 to reset.

[0055] During operation, the compressed air unit 21 draws the rising heat flow in the heating zone 12 and the preheating zone 11 and compresses it, so that the water vapor in the rising heat flow condenses into large particles of water vapor, which are intercepted and filtered by the filter plate 20. The filtered air flow is respectively re-delivered to the preheating zone 11 and the uniform cooling zone 13 through the first compressed air pipe 41 and the second compressed air pipe 42 for recycling. At the same time, the compressed gas will expand and absorb heat after entering the preheating zone 11 and the uniform cooling zone 13, reducing the temperature of the preheating zone 11 and the uniform cooling zone 13. When the strip steel 14 moves and squeezes with the furnace roller 141, impurities will fall on the blocking slide 32. At this time, the compressed air unit 21 inputs compressed air to the pressure chamber through the third compressed air pipe 43, so that the blocking slide 32 slides along the bearing cover 31, opens the bearing cover 31, and the impurities fall into the bearing cover 31. When the compressed air unit 21 stops supplying air, the blocking slide 32 is reset to isolate the impurities from the dirty bottom frame 15.

[0056] As an embodiment provided by the present invention, the output end of the air compressor unit 21 is fixedly connected to the travel chamber 4, and the air compressor unit 21 intermittently supplies air to the travel chamber 4. The travel chamber 4 is assembled at the following three positions:

[0057] First station: the travel chamber 4 is connected with the first compressed air pipe 41 and the second compressed air pipe 42 during inflation;

[0058] Second working position: the travel chamber 4 maintains the first working position and is fixedly connected to the third compressed air pipe 43 to inflate the pressure chamber and push against the blocking slide plate 32;

[0059] The third workstation: the travel chamber 4 is disconnected from the first compressed air pipe 41 , the second compressed air pipe 42 and the third compressed air pipe 43 .

[0060] Specifically, the air compression unit 21 is in an intermittent operation mode. When the air compression unit 21 is running, it will suck the inert gas in the preheating zone 11 and the heating zone 12, and input it into the travel chamber 4 after filtering, thereby increasing the air pressure of the travel chamber 4. At this time, the travel chamber 4 is in the third station, and as the compressed gas is continuously filled, the travel chamber 4 switches to the first station to connect the first compressed air pipe 41 and the second compressed air pipe 42, and then as the air compression unit 21 continues to operate, the travel chamber 4 switches to the second station. At this time, the travel chamber 4 is additionally fixedly connected to the third compressed air pipe 43 to inflate the pressure chamber and push the blocking slide 32. At this time, the travel chamber 4 reaches the last position, and the air compression unit 21 stops running, so that the travel chamber 4 switches from the second station to the first station and to the third station, waiting for the air compression unit 21 to restart the switching station.

[0061] During operation, the air compression unit 21 draws the rising heat flow in the heating zone 12 and the preheating zone 11 and compresses it, so that the water vapor in the rising heat flow condenses into large particles of water vapor, which are intercepted and filtered by the filter plate 20. The filtered air flow is input into the travel chamber 4, so that the travel chamber 4 switches from the third station to the first station, and can be re-delivered to the preheating zone 11 and the uniform cooling zone 13 through the first compressed air pipe 41 and the second compressed air pipe 42 for recycling. At the same time, the compressed gas will expand and absorb heat after entering the preheating zone 11 and the uniform cooling zone 13, thereby reducing the temperature of the preheating zone 11 and the uniform cooling zone 13. When the strip steel 14 is moved and extruded along with the furnace roller 141, impurities will fall onto the sealing slide 32. At this time, the compressed air unit 21 continues to deliver gas to the travel chamber 4, so that the travel chamber 4 is switched from the first station to the second station, and compressed gas is input into the pressure chamber through the third compressed air pipe 43, so that the sealing slide 32 slides along the bearing cover 31, opening the bearing cover 31, and the impurities will fall into the bearing cover 31. The compressed air unit 21 stops supplying gas and resets the sealing slide 32, so that the impurities are isolated from the dirty bottom frame 15.

[0062] As an embodiment provided by the present invention, a third compressed air pipe 43 is fixedly connected to a gas guide support rod 401, and a gas slide 402 that fits the inner wall of the travel chamber 4 is slidably connected to the gas guide support rod 401. An air groove 4011 is provided at the first end of the gas guide support rod 401, and a second spring 4021 is arranged along the diagonal between the gas slide 402 and the compressed air unit 21.

[0063] Specifically, the third compressed air pipe 43 is fixedly connected to a gas guide support rod 401, and the gas guide support rod 401 supplies the air slide plate 402 to slide, playing a guiding role. Figure 5For reference, the first end is the lower end and the second end is the upper end) and an air groove 4011 is opened. When the travel chamber 4 is in the third working position, the air slide 402 is pulled by the second spring 4021 to separate the travel chamber 4. At this time, the compressed inert gas is in the second end portion of the gas guide support rod 401. As the air compression unit 21 continues to be inflated, the second spring 4021 is stretched, so that the air slide 402 moves toward the first end of the gas guide support rod 401 to cover the first compressed air pipe 41 and the second compressed air pipe 42 for ventilation. After continuing to move with the inflation, the air slide 402 covers the air groove 4011 to switch to the second working position and inflate the third compressed air pipe 43. When the air compression unit 21 stops working, the stretched second spring 4021 will pull the air slide 402 to move and switch the travel chamber 4 back to the third working position.

[0064] During operation, the compressed air unit 21 draws the rising heat flow in the heating zone 12 and the preheating zone 11 and compresses it, so that the water vapor in the rising heat flow condenses into large particles of water vapor, which are intercepted and filtered by the filter plate 20. The filtered air flow is input into the travel chamber 4, and pushes the air slide plate 402 to cover the first compressed air pipe 41 and the second compressed air pipe 42 for ventilation, so that the travel chamber 4 switches from the third station to the first station, and can be re-delivered to the preheating zone 11 and the uniform cooling zone 13 through the first compressed air pipe 41 and the second compressed air pipe 42 for recycling. At the same time, the compressed gas will expand and absorb heat after entering the preheating zone 11 and the uniform cooling zone 13, thereby reducing the temperature of the preheating zone 11 and the uniform cooling zone 13. When the strip steel 14 is moved and extruded along with the furnace roller 141, impurities will fall onto the sealing slide 32. At this time, the compressed air unit 21 continues to deliver gas to the travel chamber 4, and the gas slide 402 covers the gas groove 4011, so that the travel chamber 4 is switched from the first station to the second station. Compressed gas is input into the pressure chamber through the third compressed air pipe 43, so that the sealing slide 32 slides along the bearing cover 31, opening the bearing cover 31, and the impurities will fall into the bearing cover 31. The compressed air unit 21 stops supplying gas and resets the sealing slide 32 to isolate the impurities from the dirty bottom frame 15.

[0065] As an embodiment provided by the present invention, the second compressed air pipe 42 is fixedly connected with two opposite air outlets 421 , and the dirty bottom frame 15 is symmetrically provided with guide inclined plates 33 , which feed the material toward the bearing cover 31 as the air outlets 421 vibrate out of the air.

[0066] Specifically, when the second compressed air pipe 42 discharges gas, the compressed gas will expand, and at the same time, the gas outlet 421 will face the guide inclined plate 33, which will push the guide inclined plate 33 to generate vibration, so as to guide the impurities falling from the strip steel 14 when the furnace roller 141 moves to fall along the vibrating guide inclined plate 33, so that the impurities are concentrated and not easy to diffuse, and at the same time, it can also prevent the impurities from being retained on the guide inclined plate 33.

[0067] During operation, the compressed air unit 21 draws the rising heat flow in the heating zone 12 and the preheating zone 11 and compresses it, so that the water vapor in the rising heat flow condenses into large particles of water vapor, which are intercepted and filtered by the filter plate 20. The filtered air flow is input into the travel chamber 4, and pushes the air slide plate 402 to cover the first compressed air pipe 41 and the second compressed air pipe 42 for ventilation, so that the travel chamber 4 switches from the third station to the first station, and can be re-delivered to the preheating zone 11 and the uniform cooling zone 13 through the first compressed air pipe 41 and the second compressed air pipe 42 for recycling. At the same time, the compressed gas will expand and absorb heat after entering the preheating zone 11 and the uniform cooling zone 13, reducing the temperature of the preheating zone 11 and the uniform cooling zone 13. The compressed gas blown out of the second compressed air pipe 42 expands, pushes against the guide inclined plate 33 to generate vibration to guide the impurities to fall. When the strip steel 14 is moved and extruded along with the furnace roller 141, impurities will fall onto the sealing slide 32. At this time, the compressed air unit 21 continues to deliver gas to the travel chamber 4, and the gas slide 402 covers the gas groove 4011, so that the travel chamber 4 is switched from the first station to the second station. Compressed gas is input into the pressure chamber through the third compressed air pipe 43, so that the sealing slide 32 slides along the bearing cover 31, opening the bearing cover 31, and the impurities will fall into the bearing cover 31. The compressed air unit 21 stops supplying gas and resets the sealing slide 32 to isolate the impurities from the dirty bottom frame 15.

[0068] As an embodiment provided by the present invention, a cooling pipe 51 is fixedly connected to the bottom of the heating zone 12 and the bottom of the cooling zone 13;

[0069] The gas outlet 421 is driven to discharge gas and suck the gas in the heating zone 12 to mix, and the mixed gas is input into the heating zone 12 and the uniform cooling zone 13 respectively.

[0070] Specifically, part of the compressed inert gas is sprayed out from the gas outlet 421 and mixed with the original inert gas in the heating zone 12 to reduce the dew point of the inert gas in the heating zone 12. The inert gas after the dew point is reduced enters the heating zone 12 through the space between the two guide inclined plates 33, and the other part enters the uniform cooling zone 13 through the cooling pipe 51, so that the temperature at the entrance of the uniform cooling zone 13 is increased to prevent the strip 14 from cooling too quickly.

[0071] As the best embodiment provided by the present invention, an air guide tube 52 fixedly connected to the heating zone 12 is sleeved on the air outlet 421, and an air mixing frame 53 is arranged in the heating zone 12. The air mixing frame 53 is symmetrically provided with oblique grooves 532, and the oblique grooves 532 correspond to the air outlet 421 one by one.

[0072] The air mixing frame 53 is fixedly connected to the cooling pipe 51 , and air collecting frames 531 are respectively provided at both ends of the air mixing frame 53 . A blocking plate 332 is provided on the guide inclined plate 33 , and the blocking plate 332 is driven to bend and guide the airflow into the air collecting frame 531 .

[0073] Specifically, the air guide cylinder 52 is arranged in a receiving groove 331 provided on the guide inclined plate 33. When the compressed gas is ejected from the air outlet 421, the inert gas in the heating zone 12 is sucked along the receiving groove 331 through the sleeved Venturi structure for mixing. At the same time, the compressed gas and the gas in the heating zone 12 simultaneously enter the mixing frame 53 for mixing. After mixing, they are ejected along the inclined groove 532, so that the airflow enters the heating zone 12 along the position between the two guide inclined plates 33. The air mixing frame 53 is fixedly connected to the cooling pipe 51, and part of the gas entering the air mixing frame 53 will directly enter the uniform cooling zone 13 along the cooling pipe 51. The blocking plate 332 is composed of two sections of plates connected together, wherein the plate corresponding to the air outlet 421 is made of elastic material, and is inclined when the compressed gas is ejected from the air outlet 421 to cooperate with the air collecting frame 531 to guide the airflow into the air mixing frame 53, so as to reduce the guidance of the material under the guide inclined plate 33, and at the same time, the blocking plate 332 is pushed by the airflow to increase the vibration effect, thereby prompting impurities to fall along the blocking plate 332 and reduce retention.

[0074] During operation, the compressed air unit 21 draws the rising heat flow in the heating zone 12 and the preheating zone 11 and compresses it, so that the water vapor in the rising heat flow condenses into large particles of water vapor, which are intercepted and filtered by the filter plate 20. The filtered air flow is input into the travel chamber 4, and pushes the air slide plate 402 to cover the first compressed air pipe 41 and the second compressed air pipe 42 for ventilation, so that the travel chamber 4 switches from the third station to the first station, and can be re-delivered to the preheating zone 11 and the uniform cooling zone 13 through the first compressed air pipe 41 and the second compressed air pipe 42 for recycling. At the same time, the compressed gas will expand and absorb heat after entering the preheating zone 11 and the uniform cooling zone 13, thereby reducing the temperature of the preheating zone 11 and the uniform cooling zone 13. The compressed gas blown out from the second compressed air pipe 42 expands and pushes the guide inclined plate 33 to generate vibration to guide impurities to fall. At the same time, the ejected compressed gas passes through the set Venturi structure to suck the inert gas in the heating zone 12 along the receiving groove 331 for mixing, and pushes the blocking plate 332 to bend and tilt, and enters the gas mixing frame 53. The mixed gas enters the heating zone 12 along the inclined groove 532, and enters the uniform cooling zone 13 along the cooling pipe 51. When the strip steel 14 is moved and extruded along with the furnace roller 141, impurities will fall onto the sealing slide 32. At this time, the compressed air unit 21 continues to deliver gas to the travel chamber 4, and the gas slide 402 covers the gas groove 4011, so that the travel chamber 4 is switched from the first station to the second station. Compressed gas is input into the pressure chamber through the third compressed air pipe 43, so that the sealing slide 32 slides along the bearing cover 31, opening the bearing cover 31, and the impurities will fall into the bearing cover 31. The compressed air unit 21 stops supplying gas and resets the sealing slide 32 to isolate the impurities from the dirty bottom frame 15.

[0075] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A device for preventing nodules on the roller surface of a strip steel annealing furnace, comprising an annealing furnace (1), wherein the annealing furnace (1) comprises a preheating zone (11), a heating zone (12) and a cooling zone (13) which are connected to each other, and wherein: It also includes a dew-reducing mechanism (2), which includes: An air collecting cone cover (22) is respectively arranged on the top of the heating zone (12) and the top of the preheating zone (11); An air compression unit (21), an input end of which is fixedly connected to the air collecting cone cover (22); A filter plate (20) disposed at the output end of the air compression unit (21); A first compressed air pipe (41) is provided with a return bend (411) located in the preheating zone (11), and two ends of the first compressed air pipe (41) are respectively fixedly connected to the output end of the compressed air unit (21) and fixedly connected to the top of the uniform cooling zone (13); A second compressed air pipe (42), two ends of which are respectively connected to the output end of the compressed air unit (21) and are fixedly connected to the bottom of the heating area (12); It also comprises a dirt isolation mechanism (3), which comprises a dirt bottom frame (15) arranged at the bottom of the annealing furnace (1) and a bearing cover (31) connected to the dirt bottom frame (15), a blocking slide plate (32) being arranged on the bearing cover (31), and the blocking slide plate (32) intermittently sliding back and forth to isolate the bearing cover (31) and the dirt bottom frame (15); A pressure chamber is clamped between the bearing cover (31), the bottom of the annealing furnace (1) and the first end of the blocking slide plate (32); a first spring (322) is provided between the second end of the blocking slide plate (32) and the bearing cover (31); and a third compressed air pipe (43) is fixedly connected between the pressure chamber and the compressed air unit (21); The output end of the air compression unit (21) is fixedly connected to a travel chamber (4), and the air compression unit (21) intermittently supplies air to the travel chamber (4). The travel chamber (4) is assembled at the following three positions: First workstation: the travel chamber (4) is connected to the first compressed air pipe (41) and the second compressed air pipe (42) during inflation; Second working position: the travel chamber (4) maintains the first working position and is fixedly connected to a third compressed air pipe (43) so as to inflate the pressure chamber and push against the blocking slide plate (32); The third workstation: the travel chamber (4) is disconnected from the first compressed air pipe (41), the second compressed air pipe (42) and the third compressed air pipe (43); The third compressed air pipe (43) is fixedly connected to an air guide support rod (401), and the air guide support rod (401) is slidably connected to an air slide plate (402) that fits the inner wall of the travel chamber (4). An air groove (4011) is provided at the first end of the air guide support rod (401), and a second spring (4021) is arranged along the diagonal between the air slide plate (402) and the compressed air unit (21).

2. The device for preventing nodule formation on the roller surface of a strip annealing furnace according to claim 1, characterized in that: The second compressed air pipe (42) is fixedly connected with two air outlets (421) facing each other, and the dirty bottom frame (15) is symmetrically provided with guide inclined plates (33). The guide inclined plates (33) are discharged toward the bearing cover (31) as the air outlets (421) vibrate.

3. The device for preventing nodule formation on the roller surface of a strip annealing furnace according to claim 2, characterized in that: The bottom of the heating zone (12) and the bottom of the uniform cooling zone (13) are fixedly connected by a cooling pipe (51).

4. The device for preventing nodule formation on the roller surface of a strip annealing furnace according to claim 3, characterized in that: The gas outlet (421) is driven to discharge gas and sucks the gas in the heating zone (12) to mix, and the mixed gas is input into the heating zone (12) and the uniform cooling zone (13) respectively.

5. The device for preventing nodule formation on the roller surface of a strip annealing furnace according to claim 4, characterized in that: The air outlet (421) is sleeved with an air guide cylinder (52) fixedly connected to the heating zone (12); a gas mixing frame (53) is arranged in the heating zone (12); the gas mixing frame (53) is symmetrically provided with oblique grooves (532); the oblique grooves (532) correspond one to one with the air outlet (421).

6. The device for preventing nodule formation on the roller surface of a strip annealing furnace according to claim 5, characterized in that: The air mixing frame (53) is fixedly connected to the cooling pipe (51), and air collecting frames (531) are respectively arranged at both ends of the air mixing frame (53). A blocking plate (332) is arranged on the guide inclined plate (33), and the blocking plate (332) is driven to bend and guide the airflow into the air collecting frame (531).

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