Waste heat utilization device for galvanized sheet production line

Abstract

The invention discloses a galvanized sheet production line waste heat utilization device, and relates to the technical field of galvanized sheet production. The waste heat utilization device for the galvanized sheet production line comprises a heat exchange pipe, a heat conduction coil pipe arranged on the heat exchange pipe in the airflow direction of the heat exchange pipe, a second valve plate arranged in the middle of the heat exchange pipe and first valve plates located on the two sides of the second valve plate, the first valve plates and the second valve plate are arranged in a crossed mode, and the first valve plates and the second valve plate rotate relatively. Flue gas containing heat in the heat exchange pipe is disturbed in a fluctuating mode. The driving assembly is used for driving the first valve plate and the second valve plate which are arranged in a crossed mode to rotate relatively, fluctuating turbulent flow is conducted on galvanized flue gas in the heat exchange pipe, the single flow direction of the galvanized flue gas is changed, the galvanized flue gas in the flowing process is made to be deflected and reversed in order to make full contact with the heat conduction coil pipe for heat exchange, and the waste heat recovery efficiency is improved; and the dynamic rotation of the two groups of valve plates can also play a role in baffle flow slowing, so that the circulation heat exchange time of the galvanized flue gas is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of galvanized sheet production, and specifically to a waste heat utilization device for a galvanized sheet production line. Background Art

[0002] As a commonly used sheet in mechanical and electrical installation projects, galvanized sheets can provide good surface protection, rust prevention, and corrosion prevention by galvanizing the metal surface. Galvanizing is divided into two methods: hot-dip galvanizing and cold-dip galvanizing. Among them, hot-dip galvanizing is widely used due to its thicker, more corrosion-resistant, and better quality characteristics. Hot-dip galvanizing is a process in which surface-treated steel or cast iron parts are immersed in high-temperature molten zinc liquid to form a zinc and zinc-iron alloy coating on their surfaces. During the hot-dip galvanizing process, the temperature needs to be strictly controlled between 430 and 500 °C to ensure the adhesion of the zinc layer and its corrosion resistance, and to avoid zinc layer peeling or corrosion caused by abnormal temperature. Since a large amount of heat is generated each time the metal sheet is immersed in the hot-dip galvanizing liquid and lifted, in the hot-dip galvanizing production process of galvanized sheets, a waste heat utilization device is usually used to recover and utilize the waste heat generated during hot-dip galvanizing, and the air after heat exchange is continuously discharged to the rear for the next purification treatment process.

[0003] For example, in the Chinese patent with the publication number CN113932619A, a heat treatment device for tin-plating wire processing that can recover and utilize waste heat is disclosed. The flue gas generated in the heat treatment furnace of such a device enters the interior of the recovery device through the exhaust pipe, and the heat-containing flue gas is transported into the transmission pipe to exchange heat with the cold water in the water tank. During the heat exchange process, by increasing the fluidity of the water source in the water tank, the heat exchange efficiency between the water source in the water tank and the high-temperature flue gas is improved.

[0004] Another example is the Chinese patent with the publication number CN112251698A, which discloses a waste heat utilization device for hot-dip galvanized strip production. Such a device is provided with an air suction device. By starting the exhaust fan to generate negative pressure, the heat-containing flue gas produced during galvanizing can be quickly sucked into the suction hood and transported to the heat exchange box, where heat exchange is carried out by the heat exchange tubes inside. And by spirally arranging the heat exchange tubes, the contact area between the heat exchange tubes and the water in the heat exchange box is increased, and the contact time between the heat exchange tubes and the water is prolonged, so that the water can fully absorb the heat of the hot flue gas in the heat exchange tubes.

[0005] However, when the existing form of waste heat utilization device recovers and utilizes waste heat, since the flow direction of the heat-containing air often tends to be fixed, when it exchanges heat with the water in the heat exchange tubes, it often exchanges heat with the heat exchange tubes in a local contact manner, and the heat-containing air in the non-contact part flows away under the action of wind, and the heat inside it often cannot be effectively recovered by heat exchange, resulting in a low waste heat recovery efficiency. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides a waste heat utilization device for a galvanized sheet production line, which solves the problems raised in the background art.

[0007] To achieve the above objectives, the present invention is realized through the following technical solutions: A waste heat utilization device for a galvanized sheet production line includes: a heat exchange tube, along the gas flow direction of the heat exchange tube, there is a heat conduction coil; a second valve plate, which is arranged in the middle of the heat exchange tube; a first valve plate, which is provided in two groups, and the first valve plate is located on both sides of the second valve plate. Among them, the first valve plate and the second valve plate are arranged in a cross arrangement, and the first valve plate and the second valve plate rotate relative to each other to turbulently disturb the flue gas containing heat in the heat exchange tube, causing the flow direction of the heat flue gas to deflect and exchange heat with the heat conduction coil, and forming a dynamic flipping valve plate structure to intercept and collect impurities generated due to cooling in the heat flue gas.

[0008] Furthermore, it also includes: a first dust collection box, which is arranged below the flipping path of the first valve plate and the second valve plate and is hermetically connected to the heat exchange tube. A first dust collection roller is arranged in the first dust collection box, and the first dust collection roller is provided in multiple groups. Among them, a passive gear is arranged on the first dust collection roller in the middle part; a compression table, which is arranged on the edge of the second valve plate. One side of the compression table is provided with a compression spring for providing its elastic displacement, and the other side of the compression table is provided with an active tooth seat. When the second valve plate flips, it drives the active tooth seat to engage with the passive gear, driving the first dust collection roller to rotate, and collecting the impurities intercepted by the first valve plate and the second valve plate in a roller-type flipping manner.

[0009] Furthermore, it also includes: a filter plate, which is arranged at the exhaust end of the heat exchange tube, and a cleaning brush strip is arranged on one side of the filter plate; a second dust collection box, which is arranged below the filter plate and is hermetically connected to the heat exchange tube. A second dust collection roller is arranged in the second dust collection box, and the second dust collection roller is provided in multiple groups. The rotation of the second dust collection roller drives the filter plate to rotate relative to the cleaning brush strip, brushing off the impurities intercepted on the filter plate passively, and collecting the impurities in a roller-type flipping manner.

[0010] Furthermore, the roller bodies of the first dust collection roller and the second dust collection roller are all in mutual contact. The roller bodies of the first dust collection roller and the second dust collection roller are both made of high-temperature resistant rubber materials, and there is no less than one set of aggregate grooves on the roller bodies of the second dust collection roller and the second dust collection roller. When the first dust collection roller and the second dust collection roller rotate, their roller bodies are in mutual sealed friction, and the impurities are scraped and wiped into the aggregate grooves for flipping and discharging.

[0011] Furthermore, one end of the roller shaft of each group of the first dust collection rollers is provided with a first transmission gear, and a first synchronous gear is meshed between two adjacent groups of the first transmission gears, so that when one group of the first dust collection rollers is stressed, it drives all the first dust collection rollers to rotate in the same direction.

[0012] Furthermore, a second transmission gear is provided at one end of the roller shaft of each group of the second dust collecting rollers, and a second synchronous gear is meshed between two adjacent groups of second transmission gears, so that when one group of the second dust collecting rollers is subjected to force, it drives all the second dust collecting rollers to rotate in the same direction, and one group of the second transmission gears is meshed with an external gear disk provided on the filter plate, so that when the second dust collecting rollers rotate, the filter plate is driven to rotate synchronously.

[0013] Furthermore, it also includes: a second drive shaft, which is arranged on one side of the first dust box and the second dust box away from the heat exchange tube; a first bevel gear, which is arranged at one end of the second drive shaft, and the first bevel gear is meshed with a second bevel gear arranged on one group of first dust collecting rollers; a first pulley, which is arranged at the other end of the second drive shaft, and the first pulley is horizontally opposite to the second pulley arranged on one group of second dust collecting rollers, and a transmission belt is provided between the first pulley and the second pulley.

[0014] Furthermore, it also includes a driving component for driving the first valve plate and the second valve plate to rotate relative to each other, wherein the driving component includes: a rotating shaft frame, the rotating shaft frame is provided in two groups, and is respectively provided between the first valve plate and the second valve plate, and is used to support the first valve plate and the second valve plate to rotate; a side support frame, the side support frame is provided in a U-shaped structure, and the side support frame is provided in two groups, one side of the U-frame of the side support frame is fixed to the side wall of the rotating shaft frame, and the other side of the U-frame of the side support frame is provided with an inner support shaft, one end of the inner support shaft is provided with a second driving gear, and the other end of the inner support shaft is provided with a second driving gear. A third driving gear is provided, and the third driving gear is meshed with a fourth driving gear provided between the two sets of side support frames; a first internal toothed disc, the first internal toothed disc is provided at one end of the first valve plate, and is built into the middle of the side support frame, the first internal toothed disc is meshed with the second driving gear to drive the first valve plate to rotate; a second internal toothed disc, the second internal toothed disc is provided in the middle of the second valve plate, and is built between the two opposite sets of side support frames, the second internal toothed disc is meshed with the fourth driving gear to drive the second valve plate to rotate in the opposite direction relative to the first valve plate.

[0015] Furthermore, the driving assembly further comprises a first driving shaft penetrating the first valve plate and the second valve plate, and the first driving shaft is provided with a first driving gear meshing with the second driving gear along its axial direction.

[0016] Furthermore, the heat-conducting coil includes: a first heat-conducting coil, which is provided in two groups, and the two groups of first heat-conducting coils are staggered with the rotation paths of the first valve plate and the second valve plate and are provided inside the pipeline of the heat exchange tube; and a second heat-conducting coil, which is provided outside the pipeline of the heat exchange tube.

[0017] The present invention has the following beneficial effects: (1). The waste heat utilization device of the galvanized sheet production line, through the internal and external settings of the heat exchange tubes and two groups of heat conduction coils, serves as the waste heat recovery pipeline for galvanized flue gas. While recovering the heat through heat exchange, the driving component is used to drive the first valve plate and the second valve plate arranged in a cross shape to rotate relative to each other, disturbing the flow of the galvanized flue gas in the heat exchange tubes, changing the single flow direction of the galvanized flue gas, making the flowing galvanized flue gas deflect and change direction orderly to fully contact and exchange heat with the heat conduction coils, improving the waste heat recovery efficiency. Moreover, the dynamic rotation of the two valve plates can also play a role in buffering the flow of the baffle, extending the circulation and heat exchange time of the galvanized flue gas.

[0018] (2). The waste heat utilization device of the galvanized sheet production line, through the relative flipping of the first valve plate and the second valve plate, can serve as a dynamically flipped baffle to block the impurities in the galvanized flue gas and the impurities generated by cooling, and discharge the blocked impurities into the first dust collection box. When the second valve plate rotates, it drives the synchronous rotation of the first dust collection roller in the first dust collection box to collect the discharged impurities by roller flipping and discharging.

[0019] (3). The waste heat utilization device of the galvanized sheet production line, through the setting of the filter plate, filters and blocks the impurities in the galvanized flue gas and the impurities generated by continuous cooling. Moreover, the rotation of the first dust collection roller can drive the synchronous rotation of the second dust collection roller in the second dust collection box. When the second dust collection roller rotates, it drives the filter plate to rotate relative to the cleaning brush strips by itself, brushing off the intercepted impurities on the filter plate, and collecting the impurities by roller flipping and discharging.

[0020] (4). The waste heat utilization device of the galvanized sheet production line, through the dynamically flipped baffle formed by the first valve plate and the second valve plate, and the filtering and blocking of the filter plate, can stage-collect and filter the particulate impurities generated during the cooling and heat exchange of the galvanized flue gas. On the one hand, it reduces the situation of retention and accumulation of impurities during the subsequent pipeline circulation, and on the other hand, it reduces the purification load of the subsequent flue gas purification equipment, improves the smooth flow of the galvanized flue gas, and is conducive to the stable and orderly heat exchange of the waste heat of the galvanized flue gas.

[0021] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural view of the present invention; Figure 2 is a left view of the present invention; Figure 3 is a first partial cross-sectional view of the present invention; Figure 4 is a second partial cross-sectional view of the present invention; Figure 5 is a third partial cross-sectional view of the present invention; Figure 6Schematic diagram of the heat-conducting coil in the present invention; Figure 7 Assembly schematic diagram of the first valve plate and the second valve plate in the present invention; Figure 8 First driving schematic diagram of the first valve plate and the second valve plate in the present invention; Figure 9 Second driving schematic diagram of the first valve plate and the second valve plate in the present invention; Figure 10 First structural schematic diagram of the driving component in the present invention; Figure 11 Second structural schematic diagram of the driving component in the present invention; Figure 12 Schematic diagram of the structure of the first valve plate in the present invention; Figure 13 Schematic diagram of the structure of the second valve plate in the present invention; Figure 14 Diagram of the state change of the first valve plate and the second valve plate in the present invention, where Figure 14 in (a), (b), (c), (d), (e) are the dynamic flipping schematic diagrams of 0°, 30°, 45°, 60°, 90° of the first valve plate in the present invention in sequence; Figure 15 Driving schematic diagram of the first dust collection roller in the present invention; Figure 16 Arrangement schematic diagram of the first dust collection roller in the present invention; Figure 17 Arrangement schematic diagram of the second dust collection roller in the present invention; Figure 18 Assembly drawing of the second dust collection roller and the filter plate in the present invention.

[0023] In the figure, 1 is a heat preservation cover; 2 is a heat exchange tube; 3 is an air inlet flare; 4 is an air outlet flare; 5 is a first cold quantity tube; 6 is a first heat quantity tube; 7 is a second cold quantity tube; 8 is a second heat quantity tube; 9 is a first heat conduction coil; 10 is a second heat conduction coil; 11 is a first dust collection box; 12 is a second dust collection box; 13 is a driving motor; 14 is a second driving shaft; 15 is a first bevel gear; 16 is a second bevel gear; 17 is a first pulley; 18 is a transmission belt; 19 is a second pulley; 20 is a first dust collection roller; 21 is a first transmission gear; 22 is a first synchronous gear; 23 is a second dust collection roller; 24 is a support frame; 25 is a filter plate; 26 is a first driving shaft; 27 is a first valve plate; 28 is a second valve plate; 29 is a second transmission gear; 30 is a second synchronous gear; 31 is an external tooth disc; 32 is a rotating shaft frame; 33 is a compression table; 34 is a driving tooth seat; 35 is a compression spring; 36 is a first driving gear; 37 is a second driving gear; 38 is a first internal tooth disc; 39 is a third driving gear; 40 is a fourth driving gear; 41 is a second internal tooth disc; 42 is a side support frame; 43 is an internal support shaft; 44 is a driven gear; 45 is a cleaning brush sleeve; 46 is a cleaning brush strip. Specific embodiments

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery", etc. indicating the orientation or position relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0026] Please refer to Figures 1-18 , the embodiments of the present invention provide a technical solution: a waste heat utilization device for a galvanized sheet production line.

[0027] Please refer to Figures 1-6A waste heat utilization device for a galvanized sheet production line comprises a heat exchange tube 2, one end of the heat exchange tube 2 is provided with an air inlet expansion port 3, the other end of the heat exchange tube 2 is provided with an exhaust expansion port 4, the outside of the heat exchange tube 2 is provided with an insulation cover 1 for sealing and insulating the heat exchange tube 2, and the heat exchange tube 2 is provided with a heat conduction coil along its air flow direction. When the waste heat of the galvanized flue gas of the galvanized sheet hot-dip galvanizing production line is recovered, the galvanized flue gas is guided into the heat exchange tube 2 through the air inlet expansion port 3, so that the galvanized flue gas flows along the heat exchange tube 2. While circulating, the heat conduction coil is used to exchange heat with the waste heat in the galvanized flue gas. The galvanized flue gas after heat exchange is discharged through the exhaust expansion port 4 and transported to a spray tower or a bag filter for the next step of filtering and purification.

[0028] Wherein, the heat conducting coil comprises a first heat conducting coil 9 and a second heat conducting coil 10, the first heat conducting coil 9 is provided in two groups, the two groups of first heat conducting coils 9 are arranged inside the pipeline of the heat exchange tube 2 with the rotation path of the first valve plate 27 and the second valve plate 28 staggered, and the second heat conducting coil 10 is arranged outside the pipeline of the heat exchange tube 2. When the waste heat of the galvanized flue gas is exchanged with the heat exchange tube 2, the first heat conducting coil 9 is placed inside the heat exchange tube 2 to directly contact the galvanized flue gas flowing in the heat exchange tube 2 for heat exchange. Since the galvanized flue gas is also in contact with the heat exchange tube 2 for heat exchange, the second heat conducting coil 10 is arranged outside the heat exchange tube 2 to conduct heat exchange with the heat on the wall of the heat exchange tube 2 and perform non-contact heat exchange with the galvanized flue gas, so as to improve the heat exchange utilization rate of the waste heat of the galvanized flue gas.

[0029] It should be noted that a first cooling tube 5 is provided at one end of the first heat-conducting coil 9, a first heat tube 6 is provided at the other end of the first heat-conducting coil 9, a second cooling tube 7 is provided at one end of the second heat-conducting coil 10, and a second heat tube 8 is provided at the other end of the second heat-conducting coil 10. Since the first heat-conducting coil 9 is in direct contact with the galvanized flue gas for heat exchange, and the second heat-conducting coil 10 is in indirect contact with the galvanized flue gas for heat exchange, there is a difference in the heat exchange efficiency between the two. At this time, by setting up independent first cooling tube 5 and first heat tube 6 at both ends of the first heat-conducting coil 9, and setting up independent second cooling tube 7 and second heat tube 8 at both ends of the second heat-conducting coil 10, the media in the first heat-conducting coil 9 and the second heat-conducting coil 10 maintain independent circulation and heat exchange states, and the circulation rate of the heat exchange medium in the two groups of heat-conducting coils can be controlled to ensure sufficient heat exchange between the cold and the hot, and avoid the situation where the subsequent medium is mixed due to uneven heat exchange.

[0030] In addition, a second valve plate 28 is provided in the middle of the heat exchange tube 2, and a first valve plate 27 is provided on both sides of the second valve plate 28. The first valve plate 27 and the second valve plate 28 are arranged in a cross shape. When the galvanized flue gas flows along the heat exchange tube 2, the first valve plate 27 and the second valve plate 28 are controlled to rotate relative to each other, so as to cause fluctuation disturbance of the galvanized flue gas containing heat in the heat exchange tube 2. On the one hand, the flow direction of the galvanized flue gas is changed from a single horizontal flow direction to a flow direction dynamically flipped with the two sets of valve plates, so that the flow direction of the galvanized flue gas is dynamically deflected, so that the flue gas that does not contact the heat exchange part changes its flow direction and contacts or indirectly contacts the heat transfer coil for heat exchange. In addition, the dynamic rotation of the two sets of valve plates can also play a baffle slow flow effect, thereby extending the circulation and heat exchange time of the galvanized flue gas, so that the galvanized flue gas is fully contacted for heat exchange. On the other hand, the first valve plate 27 and the second valve plate 28 The relative rotation forms a dynamic flip valve plate structure, and the flipping of the two sets of valve plates is used to intercept and collect the particulate impurities generated by cooling in the galvanized flue gas (the main component of the galvanized flue gas is zinc smoke, and the main component of zinc smoke is ammonium chloride. Ammonium chloride is decomposed and discharged at high temperature during galvanizing, and then the temperature drops during the emission and collection process, and its low-temperature compound produces microparticles. At this time, during the emission and collection process, the temperature of the zinc smoke gradually changes in a step-by-step manner along the heat exchange tube 2, and new microparticles are continuously generated, which are intercepted by the dynamic valve plate structure of the first valve plate 27 and the second valve plate 28. In addition, by utilizing the first valve plate 27 and the second valve plate 28 to disturb the galvanized flue gas, the residual heat of the galvanized flue gas is fully exposed to heat exchange and cooling, thereby preventing the internal ammonium chloride from continuously decomposing at high temperature and combining at low temperature with the change of temperature, causing the subsequent filtration and purification equipment to be unable to effectively purify the flue gas). Specifically: See also Figures 3-5 , Figures 7-14 In order to realize the dynamic turbulence of the first valve plate 27 and the second valve plate 28 on the galvanizing fume, a driving assembly is provided between the first valve plate 27 and the second valve plate 28, wherein the driving assembly includes a rotating shaft frame 32 provided between the first valve plate 27 and the second valve plate 28 and used to support the first valve plate 27 and the second valve plate 28 to rotate, a side support frame 42 fixed on the side wall of the rotating shaft frame 32, an inner support shaft 43 is provided on the other side of the side support frame 42, and a second driving gear 37 is provided at one end of the inner support shaft 43, which penetrates the first valve plate 27 and the second valve plate 2 The first drive shaft 26 of the first drive shaft 26 is provided with a first drive gear 36 meshing with the second drive gear 37 along its axial direction. A drive motor 13 mounted on the heat preservation cover 1 is provided at one end of the first drive shaft 26 to control the drive motor 13 to drive the first drive shaft 26 to rotate, and then drive the first drive gear 36 axially of the first drive shaft 26 to rotate. The meshing of the first drive gear 36 and the second drive gear 37 is used as a driving source to drive the first valve plate 27 and the second valve plate 28 to rotate relative to each other. Specifically: One end of the first valve plate 27 is provided with a first internal gear disc 38. The first internal gear disc 38 meshes with the second drive gear 37. While the second drive gear 37 rotates, it meshes and drives with the first internal gear disc 38 to drive the first valve plate 27 to rotate.

[0031] Further, the other end of the inner support shaft 43 is provided with a third drive gear 39, and the third drive gear 39 meshes with a fourth drive gear 40 arranged between two groups of side support frames 42. The middle of the second valve plate 28 is provided with a second internal gear disc 41, and the second internal gear disc 41 meshes with the fourth drive gear 40. While the second drive gear 37 rotates, it drives the third drive gear 39 to rotate synchronously through the inner support shaft 43. Then, by the meshing drive between the third drive gear 39 and the fourth drive gear 40, a reverse driving force is formed, so that the meshing drive between the fourth drive gear 40 and the second internal gear disc 41 is in reverse drive relative to the meshing drive between the second drive gear 37 and the first internal gear disc 38, driving the second valve plate 28 to rotate reversely relative to the first valve plate 27, forming a rotation mode in a cross-opposite state (see Figure 14 shown).

[0032] Please refer to Figures 3-5 、 Figures 7-9 、 Figures 15-16, to achieve the collection and discharging of impurities blocked by the first valve plate 27 and the second valve plate 28, a first dust collection box 11 is provided below the flipping paths of the first valve plate 27 and the second valve plate 28, and it is hermetically connected to the heat exchange tube 2. A first dust collection roller 20 is provided in the first dust collection box 11, and multiple groups of first dust collection rollers 20 are provided. Among them, a passive gear 44 is provided on the first dust collection roller 20 in the middle part. A compression table 33 is provided on the edge of the second valve plate 28. A compression spring 35 for providing its elastic displacement is provided on one side of the compression table 33, and an active tooth seat 34 is provided on the other side of the compression table 33. The flipping of the second valve plate 28 drives the active tooth seat 34 to engage with the passive gear 44. Using the baffle structure formed by the dynamic flipping of the first valve plate 27 and the second valve plate 28, the impurities blocked by them fall into the first dust collection box 11. And while the second valve plate 28 is rotating, its flipping path coincides with the passive gear 44, so that the active tooth seat 34 on its edge is elastically meshed and abutted against the passive gear 44 under the elastic support combination of the compression table 33 and the compression spring 35 (using the elastic support of the combination of the compression table 33 and the compression spring 35 on the active tooth seat 34 to reduce the hard collision between the active tooth seat 34 and the passive gear 44, and provide a continuous compression space for the active tooth seat 34, so that when the active tooth seat 34 engages with the passive gear 44, it always remains engaged with the passive gear 44 along with its rotating state. Using the engagement between the two to drive the passive gear 44 to rotate, and at the same time, when the second valve plate 28 drives the active tooth seat 34 to flip upward, provide the pressure contraction when the active tooth seat 34 contacts the heat exchange tube 2), and while the active tooth seat 34 rotates cyclically with the second valve plate 28, an engagement thrust is applied to the passive gear 44 to drive the passive gear 44 to rotate, so that the first dust collection roller 20 corresponding to the passive gear 44 rotates.

[0033] In addition, a first transmission gear 21 is provided at one end of the roller shaft of each group of first dust collection rollers 20, and a first synchronous gear 22 is meshed between two adjacent first transmission gears 21, so that when one group of first dust collection rollers 20 is stressed, it drives all the first dust collection rollers 20 to rotate in the same direction. When one group of first dust collection rollers 20 rotates, using the meshing transmission of the first transmission gear 21 and the first synchronous gear 22, it drives the adjacent first dust collection rollers 20 to rotate synchronously, so that all the first dust collection rollers 20 rotate in the same direction, and the impurities on the first dust collection rollers 20 falling into the first dust collection box 11 are flipped and discharged.

[0034] It should be noted that cleaning brush sleeves 45 are provided on both sides of the first dust collection roller 20 provided with the passive gear 44, and the cleaning brush sleeves 45 are provided on the adjacent first dust collection rollers 20, so that the cleaning brush sleeves 45 on both sides rotate synchronously with the passive gear 44, and relative rotation occurs with the teeth at the contact parts on both sides of the passive gear 44, and the impurities in the tooth gaps are frictionally wiped to prevent impurities from accumulating on the passive gear 44.

[0035] Please refer to Figures 3-5 、Figures 17-18 , a filter plate 25 is provided at the exhaust end of the heat exchange tube 2. One side of the filter plate 25 is provided with a support frame 24 for supporting its rotation. A cleaning brush strip 46 that fits the filter plate 25 is provided at the bottom of the support frame 24. A second dust collection box 12 is provided below the filter plate 25 and is hermetically connected to the heat exchange tube 2. A second dust collection roller 23 is provided in the second dust collection box 12. The second dust collection rollers 23 are provided in multiple groups. One end of the roller shaft of each group of second dust collection rollers 23 is provided with a second transmission gear 29. A second synchronous gear 30 is engaged between two adjacent second transmission gears 29. And one of the second transmission gears 29 is engaged with an external tooth disc 31 provided on the filter plate 25. When the galvanized flue gas continuously flows through the heat exchange tube 2 for heat exchange and cooling, when it flows through the exhaust end of the heat exchange tube 2, the filter plate 25 at its exhaust end is used to filter and intercept the particles generated by the low-temperature combination in the galvanized flue gas. While filtering and removing dust, one of the second dust collection rollers 23 is controlled to rotate. By using the transmission combination of the second transmission gear 29 and the second synchronous gear 30, all the second dust collection rollers 23 are driven to rotate synchronously. And when the second transmission gear 29 rotates, it is engaged with the external tooth disc 31 to drive the filter plate 25 to rotate around the support frame 24 as the axis, so that the filter plate 25 rotates relative to the cleaning brush strip 46 by itself. By using the passive brushing of the cleaning brush strip 46, the impurities intercepted by the filter plate 25 are brushed and cleaned, so that the impurities fall into the second dust collection box 12. At this time, through the synchronous rotation of the second dust collection rollers 23, the impurities on the second dust collection rollers 23 falling into the second dust collection box 12 are turned over and unloaded. In a double-combination mode of middle-section dust removal and end-section dust removal, the dust removal of the impurities generated during the heat exchange and cooling of the galvanized flue gas is realized, and the load of the subsequent treatment equipment is reduced.

[0036] It should be noted that in order to realize the synchronous operation of the second dust collection roller 23 and the filter plate 25, a second drive shaft 14 is provided on one side of the first dust collection box 11 and the second dust collection box 12. One end of the second drive shaft 14 is provided with a first bevel gear 15. The first bevel gear 15 is engaged with a second bevel gear 16 provided on one of the first dust collection rollers 20. The other end of the second drive shaft 14 is provided with a first belt pulley 17. The first belt pulley 17 and a second belt pulley 19 provided on one of the second dust collection rollers 23 are horizontally opposite. And there is a transmission belt 18 between the first belt pulley 17 and the second belt pulley 19. When the first dust collection roller 20 rotates, it drives the combined transmission of the second bevel gear 16 and the first bevel gear 15, and then drives the second drive shaft 14 to rotate. And during the rotation of the second drive shaft 14, it drives the combined transmission of the first belt pulley 17, the transmission belt 18, and the second belt pulley 19. As a driving source, it drives one of the second dust collection rollers 23 to rotate, and then drives all the second dust collection rollers 23 and the filter plate 25 to operate synchronously, so that the first dust collection roller 20 and the second dust collection roller 23 form a parallel operation mode. In the way of middle-section and end-section dust removal, the impurities generated by the heat exchange and cooling of the galvanized flue gas in the heat exchange tube 2 are segmented for dust removal.

[0037] In addition, the rollers of the first dust collecting roller 20 and the second dust collecting roller 23 are in mutual contact. The rollers of the first dust collecting roller 20 and the second dust collecting roller 23 are both made of high-temperature resistant rubber materials, and there is at least one set of aggregate grooves on the rollers of the second dust collecting roller 23 and the second dust collecting roller 23. When the first dust collecting roller 20 and the second dust collecting roller 23 rotate, their rollers are in sealed friction with each other, and the impurities are scraped by friction into the aggregate grooves for flipping and discharging. By making the rollers of the first dust collecting roller 20 and the second dust collecting roller 23 made of high-temperature resistant rubber materials, they have good heat resistance characteristics, and their rollers are in mutual contact. When the adjacent dust collecting rollers rotate, on the one hand, they have the characteristics of sealed friction to prevent the galvanized flue gas from flowing out through the gaps between the adjacent dust collecting rollers. On the other hand, using their elastic friction characteristics, the impurities falling on the dust collecting rollers are gradually pushed into the aggregate grooves on the rollers under frictional contact, and after the aggregate grooves are flipped downward, the impurities are discharged, so that the impurity discharge and the flue gas flow do not interfere with each other.

[0038] It should be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0039] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the art can understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A waste heat utilization device for a galvanized sheet production line, characterized in that: Comprising: A heat exchange tube (2), and a heat conduction coil is provided along the gas flow direction of the heat exchange tube (2); A second valve plate (28), which is arranged in the middle of the heat exchange tube (2); A first valve plate (27), which is provided in two groups, and the first valve plate (27) is located on both sides of the second valve plate (28); Wherein, the first valve plate (27) and the second valve plate (28) are arranged in a cross arrangement, and the first valve plate (27) and the second valve plate (28) rotate relative to each other to turbulently disturb the flue gas containing heat in the heat exchange tube (2), deflect the flow direction of the heat-containing flue gas to exchange heat with the heat conduction coil, and form a dynamic flipping valve plate structure to intercept and collect impurities generated by cooling in the heat-containing flue gas.

2. The waste heat utilization device for a galvanized sheet production line according to claim 1, wherein: Further comprising: A first dust collection box (11), which is arranged below the flipping path of the first valve plate (27) and the second valve plate (28) and is hermetically connected to the heat exchange tube (2). A first dust collection roller (20) is arranged in the first dust collection box (11), and the first dust collection roller (20) is provided in multiple groups. Among them, a passive gear (44) is arranged on the first dust collection roller (20) in the middle part; A compression table (33), which is arranged on the edge of the second valve plate (28). A compression spring (35) for providing elastic displacement is arranged on one side of the compression table (33), and an active tooth seat (34) is arranged on the other side of the compression table (33). The flipping of the second valve plate (28) drives the active tooth seat (34) to engage with the passive gear (44), driving the first dust collection roller (20) to rotate, and collecting the impurities intercepted by the first valve plate (27) and the second valve plate (28) by roller flipping.

3. The waste heat utilization device for a galvanized sheet production line according to claim 2, characterized in that: Further comprising: A filter plate (25), which is arranged at the exhaust end of the heat exchange tube (2), and a cleaning brush strip (46) is arranged on one side of the filter plate (25); A second dust collection box (12), which is arranged below the filter plate (25) and is hermetically connected to the heat exchange tube (2). A second dust collection roller (23) is arranged in the second dust collection box (12), and the second dust collection roller (23) is provided in multiple groups. The rotation of the second dust collection roller (23) drives the filter plate (25) to rotate relative to the cleaning brush strip (46), passively brush off the impurities intercepted on the filter plate (25), and collect the impurities by roller flipping.

4. The waste heat utilization device for a galvanized sheet production line according to claim 2, wherein: The roller bodies of the first dust collection roller (20) and the second dust collection roller (23) are mutually attached. The roller bodies of the first dust collection roller (20) and the second dust collection roller (23) are both made of high-temperature resistant rubber materials, and there is at least one set of aggregate grooves on the roller bodies of the second dust collection roller (23) and the second dust collection roller (23). When the first dust collection roller (20) and the second dust collection roller (23) rotate, their roller bodies rub against each other hermetically, and scrape the impurities into the aggregate grooves for flipping and discharging.

5. The waste heat utilization device for a galvanized sheet production line according to claim 4, characterized in that: One end of the roller shaft of each group of the first dust collection rollers (20) is provided with a first transmission gear (21), and a first synchronous gear (22) is engaged between two adjacent groups of the first transmission gears (21), so that when one group of the first dust collection rollers (20) is stressed, it drives all the first dust collection rollers (20) to rotate in the same direction.

6. The waste heat utilization device for a galvanized sheet production line according to claim 4, characterized in that: One end of the roller shaft of each set of the second dust collecting rollers (23) is provided with a second transmission gear (29), and a second synchronous gear (30) is engaged between adjacent sets of second transmission gears (29), so that when one set of second dust collecting rollers (23) is stressed, all the second dust collecting rollers (23) are driven to rotate in the same direction, and one set of second transmission gears (29) is engaged with an external tooth disc (31) arranged on the filter plate (25), so that when the second dust collecting rollers (23) rotate, the filter plate (25) is driven to rotate synchronously.

7. The waste heat utilization device for a galvanized sheet production line according to claim 4, characterized in that: It further includes: A second drive shaft (14), the second drive shaft (14) is arranged on one side of the first dust collecting box (11) and the second dust collecting box (12) away from the heat exchange tube (2); A first bevel gear (15), the first bevel gear (15) is arranged at one end of the second drive shaft (14), and the first bevel gear (15) is engaged with a second bevel gear (16) arranged on one set of the first dust collecting rollers (20); A first pulley (17), the first pulley (17) is arranged at the other end of the second drive shaft (14), the first pulley (17) is horizontally opposite to a second pulley (19) arranged on one set of the second dust collecting rollers (23), and a transmission belt (18) is arranged between the first pulley (17) and the second pulley (19).

8. The waste heat utilization device for a galvanized sheet production line according to any one of claims 2-7, characterized in that: It further includes a drive assembly for driving the first valve plate (27) and the second valve plate (28) to rotate relatively. Among them, the drive assembly includes: A rotating shaft frame (32), the rotating shaft frame (32) is provided in two sets, which are respectively arranged between the first valve plate (27) and the second valve plate (28) and used to support the rotation of the first valve plate (27) and the second valve plate (28); A side support frame (42), the side support frame (42) is of a U-shaped structure, there are two sets of side support frames (42), one side of the U-shaped frame of the side support frame (42) is fixed on the side wall of the rotating shaft frame (32), the other side of the U-shaped frame of the side support frame (42) is provided with an inner support shaft (43), one end of the inner support shaft (43) is provided with a second drive gear (37), the other end of the inner support shaft (43) is provided with a third drive gear (39), and the third drive gear (39) is engaged with a fourth drive gear (40) arranged between the two sets of side support frames (42); A first internal tooth disc (38), the first internal tooth disc (38) is arranged at one end of the first valve plate (27) and is placed in the middle of the U-shaped frame of the side support frame (42), and the first internal tooth disc (38) is engaged with the second drive gear (37) to drive the first valve plate (27) to rotate; A second internal tooth disc (41), the second internal tooth disc (41) is arranged in the middle of the second valve plate (28) and is placed between the two sets of opposite side support frames (42), and the second internal tooth disc (41) is engaged with the fourth drive gear (40) to drive the second valve plate (28) to rotate in the opposite direction relative to the first valve plate (27).

9. The waste heat utilization device for a galvanized sheet production line according to claim 8, wherein: The drive assembly further includes a first drive shaft (26) passing through the first valve plate (27) and the second valve plate (28), and a first drive gear (36) engaged with the second drive gear (37) is arranged along the axial direction of the first drive shaft (26).

10. The waste heat utilization device for a galvanized sheet production line according to claim 8, characterized in that: The heat conduction coil includes: A first heat-conducting coil (9), wherein the first heat-conducting coil (9) is provided in two groups, and the two groups of first heat-conducting coils (9) are arranged inside the pipeline of the heat exchange tube (2) with the rotation paths of the first valve plate (27) and the second valve plate (28) staggered; A second heat-conducting coil (10), wherein the second heat-conducting coil (10) is arranged outside the pipeline of the heat exchange tube (2).

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