Roasting tail gas dust recycling device for sodium dichromate production

Abstract

The invention discloses a sodium dichromate production roasting tail gas dust recycling device, and relates to the technical field of boiler equipment.The sodium dichromate production roasting tail gas dust recycling device comprises a mounting frame, a driving unit, a reducing unit, an anti-blocking unit and a recycling unit, the mounting frame is used for mounting and fixing the driving unit, the driving unit is used for working of a kiln body, and the reducing unit is used for changing the filter hole diameter of a filter screen; the anti-blocking unit is used for cleaning dust accumulated on the surface of the filter screen, the recovery unit is used for recovering the dust, and when the driving unit drives the kiln body to work and sodium dichromate production roasting is carried out, the filtering hole diameter of the filter screen is changed through the reducing unit, so that the situation that dust collection is affected due to the fact that the filter screen is blocked when the flow speed is too large is avoided; and dust attached to the surface of the filter screen is scraped through the anti-blocking unit to prevent blocking, the separated dust is secondarily recycled through the recycling unit, and the utilization rate of resources is increased.

Description

Technical Field

[0001] The invention relates to the technical field of boiler equipment, in particular to a device for recycling dust from roasting tail gas in the production of sodium dichromate. Background Art

[0002] In the production process of sodium dichromate, the roasting tail gas will carry a lot of dust. This dust not only contains unreacted raw materials, resulting in a waste of resources, but also may cause serious harm to the environment and human health.

[0003] During the exhaust gas treatment process, the exhaust gas flow rate will fluctuate due to changes in production conditions. Traditional fixed-aperture filters have obvious defects when facing flow rate changes. When the exhaust gas flow rate is low, a smaller filter aperture can effectively filter dust, but when the flow rate increases, if the filter aperture remains unchanged, the amount of dust passing through the filter per unit time will increase significantly, which can easily lead to filter blockage. Filter blockage will not only reduce ventilation volume and affect production efficiency, but also increase system pressure and increase equipment operation risks.

[0004] The accumulation and clogging of dust on the filter surface is one of the key issues affecting the long-term stable operation of the exhaust treatment device. Existing anti-clogging measures mainly rely on manual regular cleaning or pulse backwashing. Manual cleaning is not only labor-intensive, but also easily leads to the degradation of filter performance if it is not cleaned in time. Although pulse backwashing can remove dust on the filter to a certain extent, it is not ideal for dust with strong adhesion, and the backwashing process may damage the filter and shorten the service life of the filter. Summary of the invention

[0005] The purpose of the present invention is to provide a sodium dichromate production roasting tail gas dust recovery and utilization device to solve the problems raised in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions: The device for recycling dust from roasting exhaust gas during the production of sodium dichromate comprises a mounting frame, a driving unit, a reducing unit, an anti-blocking unit and a recovery unit, wherein the mounting frame is placed on a horizontal basis, the driving unit is fixedly mounted on the mounting frame, the reducing unit is fixedly mounted on the driving unit, the reducing unit is electrically connected to the anti-blocking unit, the reducing unit has an aperture adjustment function, the anti-blocking unit is fixedly mounted in the driving unit, and the recovery unit is fixedly mounted on the driving unit.

[0007] The mounting frame is used to install and fix the driving unit, the driving unit is used for the operation of the kiln body, the reducing unit is used to change the filtration aperture of the filter, the anti-blocking unit is used to clean the dust accumulated on the surface of the filter, and the recovery unit is used to recover the dust. When the driving unit drives the kiln body to work and sodium dichromate is produced and roasted, the filtration aperture of the filter is changed by the reducing unit to avoid clogging of the filter when the flow rate is too high, which affects the collection of dust. The dust attached to the surface of the filter is scraped off by the anti-blocking unit to prevent clogging. The separated dust is recycled for secondary use through the recovery unit to improve the utilization rate of resources.

[0008] Furthermore, the driving unit includes an output motor, a gear, a gear ring, a limit ring, a kiln body, a feed box and a filter box. The fixed end of the output motor is fixedly mounted on an end of the mounting frame away from the horizontal foundation. The output end of the output motor is fixedly connected to the gear, and the gear is meshingly connected to the gear ring. The gear ring is fixedly mounted on the outer surface of the kiln body. The limit ring is fixedly mounted on the outer surface of the kiln body. The limit ring abuts against the roller of the mounting frame. One end of the kiln body is rotatably connected to the feed box, and the other end is rotatably connected to the filter box. The feed box is fixedly mounted on the mounting frame, and the filter box is fixedly mounted on the mounting frame. The filter box is fixedly connected to the reducer unit, and the filter box is fixedly connected to the anti-blocking unit. A plurality of arc grooves are provided inside the filter box for dust recovery.

[0009] The external control unit controls the output motor to start, thereby driving the gear to rotate, and the kiln body is driven to rotate under the transmission action of the ring gear, so that the limit ring on the kiln body rotates on the roller of the mounting frame. At this time, the staff pours the raw materials into the feed box, and the raw materials are roasted through the rotating kiln body to produce sodium dichromate, and the dust generated during the roasting process is carried out to the next process from the filter box.

[0010] Furthermore, the variable diameter unit includes a driving motor, a guide vane, a rotating rod, an elastic tube, a sliding magnetic ring and a driving coil. The fixed end of the driving motor is fixedly connected to the filter box, the output end of the driving motor is fixedly connected to the rotating rod, the guide vane is fixedly installed on the outer surface of the rotating rod, one end of the elastic tube is fixedly connected to the end of the guide vane, and the other end is fixedly connected to the sliding magnetic ring. The elastic tube is filled with magnetorheological fluid, the sliding magnetic ring is nested on the outer surface of the rotating rod, the driving coil is evenly wound on the outer surface of the rotating rod, and the sliding magnetic ring is electrically connected to the anti-blocking unit.

[0011] Furthermore, the variable diameter unit also includes a bar magnet, a photoresistor, a retaining ring, a shielding cylinder, a reset spring and an induction coil. The bar magnet is fixedly mounted on the end of the sliding magnetic ring away from the driving motor, the photoresistor is fixedly mounted on the outer surface of the end of the bar magnet away from the sliding magnetic ring, the retaining ring is slidably mounted on the outer surface of the rotating rod, the retaining ring is made of a magnet, and the magnetism of the retaining ring is the same as that of the sliding magnetic ring. The shielding cylinder is fixedly mounted on the end of the rotating rod away from the driving motor, one end of the reset spring is fixedly connected to the retaining ring, and the other end is fixedly connected to the shielding cylinder, and the induction coil is fixedly mounted inside the filter box.

[0012] Before the high-temperature exhaust gas and dust generated by roasting enter the filter box, the drive motor is started by the external control unit, thereby driving the guide vanes to rotate under the transmission action of the rotating rod. After the guide vanes come into contact with the high-temperature exhaust gas, they bend. The vanes guide the gas flow, reduce unnecessary eddy currents and swirls, and thus increase the overall flow rate. After the guide vanes bend, the sliding magnetic ring is pushed backward through the elastic tube. Since the sliding magnetic ring and the retaining ring have the same magnetic properties, the retaining ring is pushed to drive the bar magnet backward and squeeze the reset spring under the effect of like repulsion. On the one hand, during the process of the sliding magnetic ring moving backward and contacting with the drive coil, the effective number of turns of the drive coil gradually decreases, and the current passing through gradually increases, so that the current of the drive coil is transmitted to the memory spring through the sliding magnetic ring. On the other hand, when the bar magnet moves in the induction coil, the magnetic flux changes, thereby generating current in the induction coil. The external control unit detects that current is generated in the induction coil, and thus current is passed through the circular electromagnet, so that the circular electromagnet is energized to generate polarity. At the same time, when the bar magnet drives the photoresistor to completely enter the shielding tube, the photoresistor detects that the light intensity becomes dim, and when the resistance gradually increases to the preset value, the external control unit cancels the magnetic field of the magnetorheological fluid in the elastic tube, so that the magnetorheological fluid is converted from solid to liquid. Under the action of the restoring force of the reset spring itself, the retaining ring is pushed to drive the bar magnet to continue to move, thereby pushing the sliding magnetic ring to move forward on the driving coil. At this time, the effective number of turns of the driving coil gradually increases, and the current delivered to the memory spring gradually decreases. As the photoresistor is completely removed from the shielding tube, the detected light intensity is maximum, and when the resistance reaches the minimum preset value, the external control unit continues to pass the magnetic field into the magnetorheological fluid in the elastic tube, so that the magnetorheological fluid continues to be solid, thereby pushing the sliding magnetic ring to move on the driving coil.

[0013] Furthermore, the anti-blocking unit includes a long rod, a cylinder, a first filter plate, a second filter plate, a toothed ring and a toothed chain. Both ends of the long rod are fixedly connected to the filter box, the cylinder is fixedly installed in the middle of the long rod, the first filter plate is rotatably installed on the cylinder, the second filter plate is fixedly installed on the cylinder, the toothed ring is fixedly installed on the outer ring of the first filter plate, the toothed chain is meshed with the toothed ring, the toothed chain is slidably installed in the filter box, and the toothed chain is made of iron.

[0014] Furthermore, the anti-blocking unit also includes a circular electromagnet, a mounting plate, an elastic rope, a telescopic ring, a memory spring, a telescopic scraper and a limit groove. The circular electromagnet is fixedly mounted on the mounting plate, the mounting plate is fixedly mounted on the filter box, a rectangular hole is opened on the mounting plate for the toothed chain to pass through, one end of the elastic rope is fixedly connected to the mounting plate, and the other end is fixedly connected to one end of the toothed chain, a block is provided at the other end of the toothed chain, the fixed end of the telescopic ring is fixedly mounted on the inner wall of the filter box, the telescopic end of the telescopic ring is slidably mounted in the limit groove, both ends of the memory spring are fixedly connected to the telescopic scraper, the memory spring is slidably mounted in the telescopic ring, the memory spring is electrically connected to the sliding magnetic ring, and the limit groove is fixedly mounted inside the filter box.

[0015] When the circular electromagnet receives current and presents polarity, it attracts one end of the tooth chain to move upward, thereby driving the tooth ring to rotate. The rotation of the tooth ring causes the first filter plate to rotate and gradually overlap with the filter holes of the second filter plate. At this time, the aperture of the filter hole reaches the maximum, so as to adapt to the high flow rate brought by the guide blade after the bending, and avoid the fixed aperture of the filter hole, which cannot meet the filtration of the exhaust gas with a larger volume per unit time under high flow rate, resulting in clogging of the filter hole and affecting the filtering effect. When the sliding magnetic ring moves backward, the effective coil of the driving coil is reduced, and the resistance is reduced, so that the current received by the memory spring increases, and it starts to collect When the sliding magnetic ring moves forward, the effective coil of the driving coil increases, and the resistance increases, thereby reducing the current received by the memory spring. The memory spring gradually recovers its initial length, and while the telescopic scraper is compressed and contracted, the telescopic ring is driven to expand along the limit groove, so that the scraper moves from right to left twice to scrape the dust attached to the first filter plate, thereby cleaning the filter plate and avoiding dust accumulation on the filter holes, which may cause blockage and affect the separation efficiency.

[0016] Furthermore, the recovery unit includes a recovery box, a recovery pipe and a nozzle. The recovery box is fixedly installed inside the filter box. One end of the recovery pipe is conductively connected to the filter box, and the other end is conductively connected to the nozzle. The nozzle is located directly above the feed port of the feed box.

[0017] When the dust is intercepted by the first filter plate inside the filter box, the dust falls into the recovery box from the arc groove of the filter box. The staff transports the unburned dust in the recovery box back to the feed box for recycling, thereby improving the utilization rate of the raw materials. The high-temperature exhaust gas is filtered and sprayed into the feed box through the recovery pipe and nozzle to preheat the newly put raw materials, avoid agglomeration caused by uneven combustion inside the kiln body, and realize the secondary utilization of the waste heat of the exhaust gas.

[0018] Furthermore, the guide vane is composed of two metal sheets, and the expansion coefficient of the metal sheet fixedly connected to the elastic tube is smaller than that of the metal sheet not connected to the elastic tube.

[0019] In order to make the guide vanes bend when they come into contact with high-temperature exhaust gas, the flow velocity is increased, the pore size of the filter plate is increased, and the dust separation and recovery efficiency of the exhaust gas is increased.

[0020] Furthermore, the end of the driving coil away from the driving motor is a current input end.

[0021] In order to change the effective number of turns of the driving coil at all times when the sliding magnetic ring moves back and forth on the driving coil, the current received by the memory spring gradually changes, so that the memory spring is extended and retracted to drive the retractable scraper to clean the surface of the first filter plate, thereby improving the filtering efficiency of exhaust dust.

[0022] Furthermore, the diameter of the recovery pipe gradually decreases.

[0023] The surface area of ​​the pipe with gradually decreasing diameter gradually decreases, which reduces the heat loss of the pipe wall. At the same time, the reduced diameter pipe increases the heat exchange intensity between the high-temperature gas and the raw materials, thereby improving the preheating effect and avoiding uneven heating in the kiln body and agglomeration.

[0024] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, after the guide vane contacts the high-temperature exhaust gas and bends, the vane guides the gas flow, reduces unnecessary eddy currents and swirls, and thus improves the overall flow rate. After the guide vane bends, the elastic tube pushes the sliding magnetic ring to move on the driving coil, pushes the retaining ring to drive the bar magnet to move backward, and squeezes the reset spring at the same time. On the one hand, during the movement of the sliding magnetic ring, the effective number of turns of the driving coil is changed, the resistance is changed, and the current delivered to the memory spring is changed. On the other hand, when the bar magnet moves in the induction coil, the magnetic flux changes, thereby generating current in the induction coil, and the external control unit sends a signal to the circular electromagnetic spring. When current is passed through the iron, the circular electromagnet is energized to generate polarity. At the same time, when the bar magnet drives the photoresistor to completely enter the shielding tube, when the resistance gradually increases to the preset value, the external control unit cancels the magnetic field on the magnetorheological fluid in the elastic tube, so that the magnetorheological fluid is converted from solid to liquid. Under the action of the restoring force of the reset spring itself, the retaining ring is pushed to drive the bar magnet to continue to move forward. As the photoresistor is completely moved out of the shielding tube, the detected light intensity is the maximum, and the resistance reaches the minimum preset value, the external control unit continues to pass the magnetic field into the magnetorheological fluid in the elastic tube, so that the magnetorheological fluid continues to be solid, thereby pushing the sliding magnetic ring to move on the driving coil.

[0025] 2. The present invention attracts one end of the tooth chain to move upward when the circular electromagnet receives current and presents polarity, thereby driving the tooth ring to rotate. The rotation of the tooth ring causes the first filter plate to rotate and gradually overlap with the filter holes of the second filter plate. At this time, the aperture of the filter hole reaches the maximum, so as to adapt to the high flow rate brought by the guide blade after bending, avoid the aperture of the filter hole being fixed, and being unable to meet the filtering of the exhaust gas whose volume increases per unit time under high flow rate, resulting in clogging of the filter hole, affecting the filtering effect; when the sliding magnetic ring moves, the effective coil of the driving coil changes, causing the current received by the memory spring to change, thereby repeatedly contracting and expanding, pulling the telescopic scraper to extend and contract, and causing the telescopic ring to begin to contract along the limit groove, driving the scraper to move back and forth, scraping off the dust attached to the first filter plate, achieving the cleaning of the filter plate, and avoiding dust accumulation on the filter hole, causing clogging and affecting the separation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall appearance structure of a sodium dichromate production roasting tail gas dust recovery and utilization device of the present invention; Figure 2 The invention relates to a sodium dichromate production roasting tail gas dust recovery and utilization device Figure 1 Another perspective structural diagram of; Figure 3 The invention relates to a sodium dichromate production roasting tail gas dust recovery and utilization device Figure 2 A schematic diagram of the structure of the partial enlarged view at center A; Figure 4 This is a schematic structural diagram of the installation relationship between the anti-blocking unit and the variable diameter unit of a sodium dichromate production roasting tail gas dust recovery and utilization device of the present invention; Figure 5 This is a schematic diagram of the installation position of a recovery box structure of a sodium dichromate production roasting tail gas dust recovery and utilization device of the present invention; Figure 6 The invention relates to a sodium dichromate production roasting tail gas dust recovery and utilization device Figure 5 The structural schematic diagram of the partial enlarged view at B in the middle; Figure 7 The invention relates to a sodium dichromate production roasting tail gas dust recovery and utilization device Figure 5 The structural schematic diagram of the partial enlarged view at C in the middle; Figure 8 This is a schematic diagram of the installation position structure of the second filter plate and the cylinder of a sodium dichromate production roasting tail gas dust recovery and utilization device of the present invention; Fig. 9 This is a schematic diagram of the installation position of the anti-blocking unit of a sodium dichromate production roasting tail gas dust recovery and utilization device of the present invention; Fig.10The invention relates to a sodium dichromate production roasting tail gas dust recovery and utilization device Fig. 9 A front view structural schematic diagram of the invention; Fig.11 The invention relates to a sodium dichromate production roasting tail gas dust recovery and utilization device Fig.10 Internal cross-sectional view structure diagram; Fig.12 This is a schematic diagram of the overall appearance structure of an anti-blocking unit of a sodium dichromate production roasting tail gas dust recovery and utilization device of the present invention; Fig.13 The invention relates to a sodium dichromate production roasting tail gas dust recovery and utilization device Fig.12 Schematic diagram of the structure of the partial enlarged view at point D in the middle.

[0027] In the figure: 1. mounting frame; 2. drive unit; 21. output motor; 22. gear; 23. gear ring; 24. limit ring; 25. kiln body; 26. feed box; 27. filter box; 3. variable diameter unit; 31. drive motor; 32. guide vane; 33. rotating rod; 34. elastic tube; 35. sliding magnetic ring; 36. drive coil; 37. bar magnet; 38. photoresistor; 39. retaining ring; 310. shielding cylinder; 311 , reset spring; 312, induction coil; 4, anti-blocking unit; 41, long rod; 42, cylinder; 43, first filter plate; 44, second filter plate; 45, gear ring; 46, gear chain; 47, circular electromagnet; 48, mounting plate; 49, elastic rope; 410, telescopic ring; 411, memory spring; 412, telescopic scraper; 413, limit groove; 5, recovery unit; 51, recovery box; 52, recovery pipe; 53, nozzle. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example: Figure 1-Figure 13 As shown, the present invention provides a technical solution: like Figure 1 , 4As shown, a sodium dichromate production roasting tail gas dust recovery and utilization device includes a mounting frame 1, a driving unit 2, a reducing unit 3, an anti-blocking unit 4 and a recovery unit 5. The mounting frame 1 is placed on a horizontal basis, the driving unit 2 is fixedly mounted on the mounting frame 1, the reducing unit 3 is fixedly mounted on the driving unit 2, the reducing unit 3 is electrically connected to the anti-blocking unit 4, the reducing unit 3 has an aperture adjustment function, the anti-blocking unit 4 is fixedly mounted in the driving unit 2, and the recovery unit 5 is fixedly mounted on the driving unit 2.

[0030] The mounting frame 1 is used to install and fix the driving unit 2, the driving unit 2 is used for the operation of the kiln body 25, the diameter-changing unit 3 is used to change the filter aperture of the filter screen, the anti-blocking unit 4 is used to clean the dust accumulated on the surface of the filter screen, and the recovery unit 5 is used to recover the dust. When the driving unit 2 drives the kiln body 25 to work and produce and roast sodium dichromate, the filter aperture of the filter screen is changed by the diameter-changing unit 3 to avoid the filter screen from being blocked when the flow rate is too large and affecting the collection of dust. The dust attached to the surface of the filter screen is scraped off by the anti-blocking unit 4 to prevent blockage, and the separated dust is recycled for a second time by the recovery unit 5 to improve the utilization rate of resources.

[0031] like Figure 2 , 3 As shown in , 4, the driving unit 2 includes an output motor 21, a gear 22, a gear ring 23, a limit ring 24, a kiln body 25, a feed box 26 and a filter box 27. The fixed end of the output motor 21 is fixedly mounted on the end of the mounting frame 1 away from the horizontal foundation. The output end of the output motor 21 is fixedly connected to the gear 22, the gear 22 is meshed with the gear ring 23, the gear ring 23 is fixedly mounted on the outer surface of the kiln body 25, the limit ring 24 is fixedly mounted on the outer surface of the kiln body 25, the limit ring 24 is abutted against the roller of the mounting frame 1, one end of the kiln body 25 is rotatably connected to the feed box 26, and the other end is rotatably connected to the filter box 27, the feed box 26 is fixedly mounted on the mounting frame 1, the filter box 27 is fixedly mounted on the mounting frame 1, the filter box 27 is fixedly connected to the reducer unit 3, the filter box 27 is fixedly connected to the anti-blocking unit 4, and a plurality of arc grooves are provided inside the filter box 27 for dust recovery.

[0032] The external control unit controls the output motor 21 to start, thereby driving the gear 22 to rotate, and the kiln body 25 is driven to rotate under the transmission action of the ring gear 23, so that the limit ring 24 on the kiln body 25 rotates on the roller of the mounting frame 1. At this time, the staff pours the raw materials into the feed box 26, and the raw materials are roasted through the rotating kiln body 25 to produce sodium dichromate, and the dust generated during the roasting process is passed to the next process from the filter box 27.

[0033] like Fig.12 , 13As shown, the variable diameter unit 3 includes a driving motor 31, a guide vane 32, a rotating rod 33, an elastic tube 34, a sliding magnetic ring 35 and a driving coil 36. The fixed end of the driving motor 31 is fixedly connected to the filter box 27, the output end of the driving motor 31 is fixedly connected to the rotating rod 33, the guide vane 32 is fixedly installed on the outer surface of the rotating rod 33, one end of the elastic tube 34 is fixedly connected to the end of the guide vane 32, and the other end is fixedly connected to the sliding magnetic ring 35. The elastic tube 34 is filled with magnetorheological fluid, the sliding magnetic ring 35 is nested on the outer surface of the rotating rod 33, the driving coil 36 is evenly wound on the outer surface of the rotating rod 33, and the sliding magnetic ring 35 is electrically connected to the anti-blocking unit 4.

[0034] like Fig.11 , 13 As shown, the variable diameter unit 3 also includes a bar magnet 37, a photoresistor 38, a retaining ring 39, a shielding cylinder 310, a reset spring 311 and an induction coil 312. The bar magnet 37 is fixedly mounted on the end of the sliding magnetic ring 35 away from the driving motor 31. The photoresistor 38 is fixedly mounted on the outer surface of the end of the bar magnet 37 away from the sliding magnetic ring 35. The retaining ring 39 is slidably mounted on the outer surface of the rotating rod 33. The retaining ring 39 is made of a magnet, and the magnetism of the retaining ring 39 is the same as that of the sliding magnetic ring 35. The shielding cylinder 310 is fixedly mounted on the end of the rotating rod 33 away from the driving motor 31. One end of the reset spring 311 is fixedly connected to the retaining ring 39, and the other end is fixedly connected to the shielding cylinder 310. The induction coil 312 is fixedly mounted inside the filter box 27.

[0035] Before the high-temperature exhaust gas and dust generated by roasting enter the filter box 27, the drive motor 31 is controlled to start by the external control unit, so that the guide vane 32 is driven to rotate under the transmission action of the rotating rod 33. After the guide vane 32 contacts the high-temperature exhaust gas, it bends. The vane guides the gas flow, reduces unnecessary eddy currents and swirls, and thus improves the overall flow rate. After the guide vane 32 bends, the sliding magnetic ring 35 is pushed backward by the elastic tube 34. Since the sliding magnetic ring 35 and the retaining ring 39 have the same magnetic properties, the retaining ring 39 is pushed to drive the bar magnet 37 to move backward under the effect of like-sex repulsion, while squeezing the reset spring 311. On the one hand, during the process of the sliding magnetic ring 35 moving backward and contacting with the drive coil 36, the effective number of turns of the drive coil 36 gradually decreases, and the current passing through gradually increases, so that the current of the drive coil 36 is transmitted to the memory spring 411 through the sliding magnetic ring 35. On the other hand, when the bar magnet 37 moves in the induction coil 312, the magnetic flux changes, thereby generating an electric current in the induction coil 312. Flow, the external control unit detects that current is generated in the induction coil 312, and thus current is passed through the circular electromagnet 47, so that the circular electromagnet 47 is energized to generate polarity. At the same time, when the bar magnet 37 drives the photoresistor 38 to completely enter the shielding tube 310, the photoresistor 38 detects that the light intensity becomes dim, and when the resistance gradually increases to the preset value, the external control unit cancels the magnetic field of the magnetorheological fluid in the elastic tube 34, so that the magnetorheological fluid is converted from solid to liquid. Under the action of the restoring force of the reset spring 311 itself, the retaining ring 39 is pushed to drive the bar magnet 37 to continue to move, thereby pushing the sliding magnetic ring 35 to move forward on the driving coil 36. At this time, the effective number of turns of the driving coil 36 gradually increases, and the current delivered to the memory spring 411 gradually decreases. As the photoresistor 38 is completely removed from the shielding tube 310, the detected light intensity is maximum, and when the resistance reaches the minimum preset value, the external control unit continues to pass the magnetic field into the magnetorheological fluid in the elastic tube 34, so that the magnetorheological fluid continues to be solid, thereby pushing the sliding magnetic ring 35 to move on the driving coil 36.

[0036] like Figure 5 , 6 As shown in Figures 7, 8, 9, 10 and 11, the anti-blocking unit 4 includes a long rod 41, a cylinder 42, a first filter plate 43, a second filter plate 44, a toothed ring 45 and a toothed chain 46. Both ends of the long rod 41 are fixedly connected to the filter box 27, the cylinder 42 is fixedly installed in the middle of the long rod 41, the first filter plate 43 is rotatably installed on the cylinder 42, the second filter plate 44 is fixedly installed on the cylinder 42, the toothed ring 45 is fixedly installed on the outer ring of the first filter plate 43, the toothed chain 46 is meshed with the toothed ring 45, and the toothed chain 46 is slidably installed in the filter box 27. The toothed chain 46 is made of iron.

[0037] like Figure 5 , 6As shown in Figures 7, 9 and 10, the anti-blocking unit 4 also includes a circular electromagnet 47, a mounting plate 48, an elastic rope 49, a telescopic ring 410, a memory spring 411, a telescopic scraper 412 and a limiting groove 413. The circular electromagnet 47 is fixedly mounted on the mounting plate 48, and the mounting plate 48 is fixedly mounted on the filter box 27. A rectangular hole is opened on the mounting plate 48 for the toothed chain 46 to pass through. One end of the elastic rope 49 is fixedly connected to the mounting plate 48, and the other end is fixedly connected to one end of the toothed chain 46. A stopper is provided at the other end of the toothed chain 46. The fixed end of the telescopic ring 410 is fixedly mounted on the inner wall of the filter box 27, and the telescopic end of the telescopic ring 410 is slidably mounted in the limiting groove 413. Both ends of the memory spring 411 are fixedly connected to the telescopic scraper 412, and the memory spring 411 is slidably mounted in the telescopic ring 410. The memory spring 411 is electrically connected to the sliding magnetic ring 35, and the limiting groove 413 is fixedly mounted inside the filter box 27.

[0038] When the circular electromagnet 47 receives current and presents polarity, it attracts one end of the tooth chain 46 to move upward, thereby driving the tooth ring 45 to rotate. The rotation process of the tooth ring 45 causes the first filter plate 43 to rotate and gradually overlap with the filter hole of the second filter plate 44. At this time, the aperture of the filter hole reaches the maximum, so as to adapt to the high flow rate brought by the bent guide blade 32, avoid the fixed aperture of the filter hole, and fail to meet the filtration of the exhaust gas with a larger volume per unit time under high flow rate, resulting in clogging of the filter hole and affecting the filtering effect. When the sliding magnetic ring 35 moves backward, the effective coil of the driving coil 36 is reduced, and the resistance is reduced, so that the current received by the memory spring 411 increases, thereby starting to contract and pulling the telescopic spring 411 to move backward. When the scraper 412 extends, it pushes the telescopic ring 410 to begin to contract along the limit groove 413, so that the scraper moves from left to right to scrape off the dust attached to the first filter plate 43. When the sliding magnetic ring 35 moves forward, the effective coil of the driving coil 36 increases, and the resistance increases, thereby reducing the current received by the memory spring 411. The memory spring 411 gradually restores its initial length, and while the telescopic scraper 412 is compressed and contracted, the telescopic ring 410 is driven to expand along the limit groove 413, so that the scraper moves from right to left twice to scrape off the dust attached to the first filter plate 43, thereby cleaning the filter plate and avoiding dust accumulation on the filter holes, causing blockage and affecting the separation efficiency.

[0039] like Figure 2 , 5 As shown, the recovery unit 5 includes a recovery box 51, a recovery pipe 52 and a nozzle 53. The recovery box 51 is fixedly installed inside the filter box 27. One end of the recovery pipe 52 is conductively connected to the filter box 27, and the other end is conductively connected to the nozzle 53. The nozzle 53 is located directly above the feed port of the feed box 26.

[0040] When the dust is intercepted by the first filter plate 43 inside the filter box 27, the dust falls into the recovery box 51 from the arc groove of the filter box 27. The staff transports the unburned dust in the recovery box 51 back to the feed box 26 for recycling, thereby improving the utilization rate of the raw materials. After being filtered, the high-temperature exhaust gas is sprayed into the feed box 26 through the recovery pipe 52 and the nozzle 53 to preheat the newly added raw materials, avoid agglomeration caused by uneven combustion inside the kiln body 25, and realize the secondary utilization of the waste heat of the exhaust gas.

[0041] like Fig.12 As shown, the guide vane 32 is composed of two metal sheets, and the expansion coefficient of the metal sheet fixedly connected to the elastic tube 34 is smaller than that of the metal sheet not connected to the elastic tube 34 .

[0042] In order to make the guide blade 32 bend when it contacts the high-temperature exhaust gas, the flow velocity is increased, the aperture of the filter plate is increased, and the dust separation and recovery efficiency of the exhaust gas is increased.

[0043] like Fig.13 As shown, the end of the driving coil 36 away from the driving motor 31 is a current input end.

[0044] In order to change the effective number of turns of the driving coil 36 at all times when the sliding magnetic ring 35 moves back and forth on the driving coil 36, the current received by the memory spring 411 gradually changes, so that the memory spring 411 is extended and retracted to drive the retractable scraper 412 to clean the surface of the first filter plate 43, thereby improving the filtering efficiency of exhaust dust.

[0045] like Figure 2 As shown, the diameter of the recovery pipe 52 gradually decreases.

[0046] The surface area of ​​the pipe with gradually decreasing diameter gradually decreases, reducing the heat loss of the pipe wall. At the same time, the reduced diameter pipe increases the heat exchange intensity between the high-temperature gas and the raw material, thereby improving the preheating effect and avoiding uneven heating in the kiln body 25 and agglomeration.

[0047] Working principle of the present invention: The external control unit controls the output motor 21 to start, thereby driving the gear 22 to rotate, and the kiln body 25 is driven to rotate under the transmission action of the ring gear 23, so that the limit ring 24 on the kiln body 25 rotates on the roller of the mounting frame 1. At this time, the staff pours the raw materials into the feed box 26, and the raw materials are roasted through the rotating kiln body 25 to produce sodium dichromate, and the dust generated during the roasting process is passed to the next process from the filter box 27.

[0048] Before the high-temperature exhaust gas and dust generated by roasting enter the filter box 27, the drive motor 31 is controlled to start by the external control unit, so that the guide vane 32 is driven to rotate under the transmission action of the rotating rod 33. After the guide vane 32 contacts the high-temperature exhaust gas, it bends. The vane guides the gas flow, reduces unnecessary eddy currents and swirls, and thus improves the overall flow rate. After the guide vane 32 bends, the sliding magnetic ring 35 is pushed backward by the elastic tube 34. Since the sliding magnetic ring 35 and the retaining ring 39 have the same magnetic properties, the retaining ring 39 is pushed to drive the bar magnet 37 to move backward under the effect of like-sex repulsion, while squeezing the reset spring 311. On the one hand, during the process of the sliding magnetic ring 35 moving backward and contacting with the drive coil 36, the effective number of turns of the drive coil 36 gradually decreases, and the current passing through gradually increases, so that the current of the drive coil 36 is transmitted to the memory spring 411 through the sliding magnetic ring 35. On the other hand, when the bar magnet 37 moves in the induction coil 312, the magnetic flux changes, thereby generating an electric current in the induction coil 312. Flow, the external control unit detects that current is generated in the induction coil 312, and thus current is passed through the circular electromagnet 47, so that the circular electromagnet 47 is energized to generate polarity. At the same time, when the bar magnet 37 drives the photoresistor 38 to completely enter the shielding tube 310, the photoresistor 38 detects that the light intensity becomes dim, and when the resistance gradually increases to the preset value, the external control unit cancels the magnetic field of the magnetorheological fluid in the elastic tube 34, so that the magnetorheological fluid is converted from solid to liquid. Under the action of the restoring force of the reset spring 311 itself, the retaining ring 39 is pushed to drive the bar magnet 37 to continue to move, thereby pushing the sliding magnetic ring 35 to move forward on the driving coil 36. At this time, the effective number of turns of the driving coil 36 gradually increases, and the current delivered to the memory spring 411 gradually decreases. As the photoresistor 38 is completely removed from the shielding tube 310, the detected light intensity is maximum, and when the resistance reaches the minimum preset value, the external control unit continues to pass the magnetic field into the magnetorheological fluid in the elastic tube 34, so that the magnetorheological fluid continues to be solid, thereby pushing the sliding magnetic ring 35 to move on the driving coil 36.

[0049] When the circular electromagnet 47 receives current and presents polarity, it attracts one end of the tooth chain 46 to move upward, thereby driving the tooth ring 45 to rotate. The rotation process of the tooth ring 45 causes the first filter plate 43 to rotate and gradually overlap with the filter hole of the second filter plate 44. At this time, the aperture of the filter hole reaches the maximum, so as to adapt to the high flow rate brought by the bent guide blade 32, avoid the fixed aperture of the filter hole, and fail to meet the filtration of the exhaust gas with a larger volume per unit time under high flow rate, resulting in clogging of the filter hole and affecting the filtering effect. When the sliding magnetic ring 35 moves backward, the effective coil of the driving coil 36 is reduced, and the resistance is reduced, so that the current received by the memory spring 411 increases, thereby starting to contract and pulling the telescopic spring 411 to move backward. When the scraper 412 extends, it pushes the telescopic ring 410 to begin to contract along the limit groove 413, so that the scraper moves from left to right to scrape off the dust attached to the first filter plate 43. When the sliding magnetic ring 35 moves forward, the effective coil of the driving coil 36 increases, and the resistance increases, thereby reducing the current received by the memory spring 411. The memory spring 411 gradually restores its initial length, and while the telescopic scraper 412 is compressed and contracted, the telescopic ring 410 is driven to expand along the limit groove 413, so that the scraper moves from right to left twice to scrape off the dust attached to the first filter plate 43, thereby cleaning the filter plate and avoiding dust accumulation on the filter holes, causing blockage and affecting the separation efficiency.

[0050] When the dust is intercepted by the first filter plate 43 inside the filter box 27, the dust falls into the recovery box 51 from the arc groove of the filter box 27. The staff transports the unburned dust in the recovery box 51 back to the feed box 26 for recycling, thereby improving the utilization rate of the raw materials. After being filtered, the high-temperature exhaust gas is sprayed into the feed box 26 through the recovery pipe 52 and the nozzle 53 to preheat the newly added raw materials, avoid agglomeration caused by uneven combustion inside the kiln body 25, and realize the secondary utilization of the waste heat of the exhaust gas.

[0051] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A device for recycling dust from roasting tail gas in the production of sodium dichromate, characterized in that: A sodium dichromate production roasting tail gas dust recovery and utilization device comprises a mounting frame (1), a driving unit (2), a diameter reducing unit (3), an anti-blocking unit (4) and a recovery unit (5), wherein the mounting frame (1) is placed on a horizontal foundation, the driving unit (2) is fixedly mounted on the mounting frame (1), the diameter reducing unit (3) is fixedly mounted on the driving unit (2), the diameter reducing unit (3) is electrically connected to the anti-blocking unit (4), the diameter reducing unit (3) has an aperture adjustment function, the anti-blocking unit (4) is fixedly mounted in the driving unit (2), and the recovery unit (5) is fixedly mounted on the driving unit (2).

2. The sodium dichromate production roasting tail gas dust recovery and utilization device according to claim 1, characterized in that: The driving unit (2) comprises an output motor (21), a gear (22), a gear ring (23), a limit ring (24), a kiln body (25), a feed box (26) and a filter box (27); the fixed end of the output motor (21) is fixedly mounted on an end of the mounting frame (1) away from the horizontal foundation; the output end of the output motor (21) is fixedly connected to the gear (22); the gear (22) is meshingly connected to the gear ring (23); the gear ring (23) is fixedly mounted on the outer surface of the kiln body (25); the limit ring (24) is fixedly mounted on the outer surface of the kiln body (25); The kiln body (25) is provided with a kiln body (25) having an outer surface, the limiting ring (24) abutting against a roller of the mounting frame (1), one end of the kiln body (25) being rotatably connected to a feed box (26), and the other end being rotatably connected to a filter box (27), the feed box (26) being fixedly mounted on the mounting frame (1), the filter box (27) being fixedly mounted on the mounting frame (1), the filter box (27) being fixedly connected to a diameter reducing unit (3), the filter box (27) being fixedly connected to an anti-blocking unit (4), and a plurality of groups of arc grooves being provided inside the filter box (27) for recovering dust.

3. The sodium dichromate production roasting tail gas dust recovery and utilization device according to claim 2, characterized in that: The variable diameter unit (3) comprises a drive motor (31), a guide vane (32), a rotating rod (33), an elastic tube (34), a sliding magnetic ring (35) and a drive coil (36); the fixed end of the drive motor (31) is fixedly connected to the filter box (27); the output end of the drive motor (31) is fixedly connected to the rotating rod (33); the guide vane (32) is fixedly mounted on the outer surface of the rotating rod (33); one end of the elastic tube (34) is fixedly connected to the end of the guide vane (32); and the other end is fixedly connected to the sliding magnetic ring (35); the elastic tube (34) is filled with magnetorheological fluid; the sliding magnetic ring (35) is nested on the outer surface of the rotating rod (33); the drive coil (36) is evenly wound on the outer surface of the rotating rod (33); and the sliding magnetic ring (35) is electrically connected to the anti-blocking unit (4).

4. The device for recycling dust from roasting tail gas during production of sodium dichromate according to claim 3, characterized in that: The variable diameter unit (3) further comprises a bar magnet (37), a photoresistor (38), a retaining ring (39), a shielding cylinder (310), a reset spring (311) and an induction coil (312); the bar magnet (37) is fixedly mounted on an end of the sliding magnetic ring (35) away from the driving motor (31); the photoresistor (38) is fixedly mounted on the outer surface of an end of the bar magnet (37) away from the sliding magnetic ring (35); the retaining ring (39) is slidably mounted on the outer surface of the rotating rod (33); the retaining ring (39) is made of a magnet; the magnetic properties of the retaining ring (39) are the same as those of the sliding magnetic ring (35); the shielding cylinder (310) is fixedly mounted on an end of the rotating rod (33) away from the driving motor (31); one end of the reset spring (311) is fixedly connected to the retaining ring (39) and the other end is fixedly connected to the shielding cylinder (310); and the induction coil (312) is fixedly mounted inside the filter box (27).

5. The sodium dichromate production roasting tail gas dust recovery and utilization device according to claim 2, characterized in that: The anti-blocking unit (4) comprises a long rod (41), a cylinder (42), a first filter plate (43), a second filter plate (44), a toothed ring (45) and a toothed chain (46); both ends of the long rod (41) are fixedly connected to the filter box (27); the cylinder (42) is fixedly mounted on the middle of the long rod (41); the first filter plate (43) is rotatably mounted on the cylinder (42); the second filter plate (44) is fixedly mounted on the cylinder (42); the toothed ring (45) is fixedly mounted on the outer ring of the first filter plate (43); the toothed chain (46) is meshedly connected to the toothed ring (45); the toothed chain (46) is slidably mounted in the filter box (27); and the toothed chain (46) is made of iron.

6. The device for recycling dust from roasting tail gas during production of sodium dichromate according to claim 5, characterized in that: The anti-blocking unit (4) further comprises a circular electromagnet (47), a mounting plate (48), an elastic rope (49), a telescopic ring (410), a memory spring (411), a telescopic scraper (412) and a limit groove (413); the circular electromagnet (47) is fixedly mounted on the mounting plate (48); the mounting plate (48) is fixedly mounted on the filter box (27); a rectangular hole is provided on the mounting plate (48) for the toothed chain (46) to pass through; one end of the elastic rope (49) is fixedly connected to the mounting plate (48); the other end is fixedly connected to the toothed chain (46); The ends of the toothed chain (46) are fixedly connected, the other end of the toothed chain (46) is provided with a stopper, the fixed end of the telescopic ring (410) is fixedly mounted on the inner wall of the filter box (27), the telescopic end of the telescopic ring (410) is slidably mounted in the limiting groove (413), the two ends of the memory spring (411) are fixedly connected to the telescopic scraper (412), the memory spring (411) is slidably mounted in the telescopic ring (410), the memory spring (411) is electrically connected to the sliding magnetic ring (35), and the limiting groove (413) is fixedly mounted inside the filter box (27).

7. The device for recycling dust from roasting tail gas during production of sodium dichromate according to claim 2, characterized in that: The recovery unit (5) comprises a recovery box (51), a recovery pipe (52) and a nozzle (53); the recovery box (51) is fixedly installed inside the filter box (27); one end of the recovery pipe (52) is conductively connected to the filter box (27) and the other end is conductively connected to the nozzle (53); the nozzle (53) is located directly above the feed port of the feed box (26).

8. The device for recycling dust from roasting tail gas during production of sodium dichromate according to claim 3, characterized in that: The guide vane (32) is composed of two metal sheets, and the expansion coefficient of the metal sheet fixedly connected to the elastic tube (34) is smaller than that of the metal sheet not connected to the elastic tube (34).

9. The device for recycling dust from roasting tail gas during production of sodium dichromate according to claim 3, characterized in that: The end of the driving coil (36) away from the driving motor (31) is a current input end.

10. The device for recycling dust from roasting tail gas during production of sodium dichromate according to claim 7, characterized in that: The diameter of the recovery pipe (52) gradually decreases.

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