A waste gas purification device for magnesium sulfate production

Abstract

This invention relates to the field of waste gas purification technology, specifically a waste gas purification device for magnesium sulfate production, comprising: a hollow mounting plate inside a gas transmission pipeline; a pleated cylindrical filter screen fixed on the hollow mounting plate for filtering waste gas; a drive cylinder vertically mounted on the hollow mounting plate, with its extension end connected downward to a drive ring; and multiple sets of limiting cranks slidably connected to the bottom of the drive ring, each set of limiting cranks connected to a vertical hinge rod at the end far from the drive ring, with two sets of vertical hinge rods rotatably connected to an inclined outer pipe. This waste gas purification device for magnesium sulfate production, through a design of "airflow back pressure triggering + nozzle adaptive approach + vibration coordination," when the filter screen is clogged, the back pressure of the arc-shaped nozzle pushes the wedge block to unlock, and the inner cylinder, through a return spring, brings the nozzle closer to the filter screen, shortening the airflow distance and increasing the impact pressure, which, in conjunction with a pneumatic vibrator, cracks the sulfate scale; and the nozzle sprays air tangentially at an inclined angle, penetrating deep into the pleated "valleys," eliminating cleaning dead angles and significantly reducing filter screen replacement.

Description

Technical Field

[0001] This invention relates to the field of waste gas purification technology, specifically to a waste gas purification device for magnesium sulfate production. Background Technology

[0002] Magnesium sulfate, as an important chemical raw material, is widely used in medicine, agriculture, building materials and other fields. Its production process (such as the preparation of magnesium sulfate by the magnesite sulfuric acid process and the evaporation and crystallization of magnesium sulfate solution) generates a large amount of waste gas containing sticky magnesium dust, sulfuric acid mist and sulfate particles. If directly emitted, it will cause air pollution, and the dust adhering to the inner wall of the equipment can easily cause problems such as pipe blockage and equipment corrosion. Therefore, it is necessary to filter and treat the waste gas through a waste gas purification device to meet the emission standards.

[0003] Currently, magnesium sulfate production enterprises mostly adopt a waste gas treatment model of "filtering + regular cleaning," among which pleated cylindrical filters have become the mainstream filter element due to their advantages of large filtration area and low dust load per unit area. However, in practical applications, existing technologies have the following key pain points:

[0004] Low efficiency in cleaning clogged filters: The sticky magnesium dust in magnesium sulfate exhaust gas easily adheres to the "valleys" (recessed areas) of the pleated filter screen, and long-term operation will form hard sulfate scale (severe clogging); traditional cleaning methods (such as manual disassembly and cleaning, direct spraying from fixed nozzles) cannot penetrate deep into the pleated "valleys" and lack targeted intensive cleaning for severely clogged areas, resulting in incomplete cleaning, frequent filter replacement, and increased enterprise operation and maintenance costs.

[0005] Filters and cleaning components are easily damaged: Some devices use high-pressure direct spraying or rigid impact to clean the filter in order to improve the cleaning effect, which can easily cause the pleated filter to deform and the filter holes to break, thus shortening the filter's service life.

[0006] Therefore, the development of a waste gas purification device that can precisely clean heavily clogged areas of the pleated cylindrical filter screen has become an urgent need in the industry. Summary of the Invention

[0007] The purpose of this invention is to provide a waste gas purification device for magnesium sulfate production, thereby solving the problem mentioned in the background art of difficulty in achieving precise cleaning of heavily clogged areas of the pleated cylindrical filter screen. To achieve the above objective, this invention provides the following technical solution:

[0008] A waste gas purification device for magnesium sulfate production includes: a hollow mounting plate inside a gas transmission pipeline;

[0009] A pleated cylindrical filter screen fixed on a hollow mounting plate for filtering exhaust gas;

[0010] A drive cylinder is vertically mounted on a hollow mounting plate, with its telescopic end connected downward to a drive ring; multiple sets of limiting cranks are slidably connected to the bottom of the drive ring, and each set of limiting cranks is connected to a vertical hinge rod at the end far from the drive ring, with the two sets of vertical hinge rods rotating to connect to an inclined outer tube.

[0011] A limiting disc that slides along the axial direction of the outer tube, with an arc-shaped nozzle on one side of the limiting disc that is inclined towards the outer wall of the pleated cylindrical filter screen;

[0012] The inner wall of the outer tube is provided with a receiving groove, and a pre-compressed return spring is fixed in the receiving groove. A release cylinder is provided on the inner side of the return spring.

[0013] The release cylinder is connected to a passive wedge block at the end of the limiting disk, and the end of the limiting disk is connected to a matching active wedge block;

[0014] When the severely clogged pleated cylindrical filter screen causes back pressure on the airflow at the nozzle of the arc-shaped nozzle, the active wedge block squeezes the passive wedge block, driving the release of the swirl cylinder deflection.

[0015] The inner cylinder is connected to the inner cylinder body, which is connected to the return spring at the far end of the outer tube. The outer rotating part is connected to the rotating shaft that abuts against the bend of the limiting crank.

[0016] After the rotary cylinder is released and deflected, the inner cylinder uses the reset force of the reset spring to deflect the outer tube, causing the arc-shaped nozzle to approach the blocked area and achieve precise and enhanced air jet cleaning.

[0017] Preferably, the far-limiting disc end of the release cylinder is connected to a first wedge-shaped locking plate, and the end face of the outer tube is connected to a second wedge-shaped locking plate that abuts against the inclined surface of the first wedge-shaped locking plate.

[0018] The outer tube is connected to a reset wedge block that is longitudinally misaligned with the first wedge-shaped locking plate;

[0019] When the active wedge block squeezes the passive wedge block, the first and second wedge-shaped locking plates separate and unlock the inner cylinder.

[0020] When resetting after cleaning, the first wedge-shaped locking plate squeezes the reset wedge block belt to release the rotating cylinder and reset, then re-engages with the second wedge-shaped locking plate.

[0021] Preferably, the inner cylinder has a groove for accommodating the deflection of the first wedge-shaped locking plate, and a symmetrical elastic buckle plate is provided at the top;

[0022] One end of the elastic buckle is hinged to a T-shaped cylindrical seat, and its vertical rod is limited to slide into the inner cylinder. A tension spring is sleeved on the vertical rod, and the two ends of the tension spring are connected to the vertical rod of the T-shaped cylindrical seat and the inner wall of the inner cylinder.

[0023] The T-shaped cylindrical base disc end is hinged to the elastic buckle plate, where a return spring telescopic rod is connected.

[0024] Preferably, the bottom of the hollow mounting plate is connected to a reset hook plate that is coplanar with the inner cylinder;

[0025] After the inner cylinder is fully extended, the reset hook plate engages with the elastic buckle plate, pulling the elastic buckle plate to deflect the inner cylinder and outer tube back to their original positions, so that the arc-shaped nozzle returns to its initial tilt position; the drive ring has a curved inner groove, and the drive ring slides longitudinally along the reset hook plate to avoid interference, ensuring accurate nozzle deflection and reset.

[0026] Preferably, the bottom of the drive ring is equipped with a piston-type pneumatic vibrator that abuts against the outer wall of the pleated cylindrical filter screen;

[0027] When the arc-shaped nozzle approaches the blockage area, the piston-type pneumatic vibrator operates synchronously, transmitting vibration force in conjunction with the airflow to impact and crack the sulfate scale.

[0028] Preferably, the arc-shaped nozzle is a pulse nozzle.

[0029] Preferably, the jet end of the arc-shaped nozzle is connected to a fixed air guide plate, and a corresponding movable air guide plate is slidably positioned between them, with a high-temperature resistant spring telescopic rod connecting the two.

[0030] The bottom of the hollow mounting plate is connected to an arc-shaped extrusion block that abuts against the movable air guide plate; when not cleaning, the movable and fixed air guide plate fits and seals the nozzle to prevent dust adhesion; when cleaning, the plates separate to ensure precise airflow.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] This invention provides precise cleaning for severely clogged surfaces, enhancing the thoroughness of cleaning. Through a design combining "airflow back pressure triggering + nozzle adaptive approach + vibration coordination," when the filter is clogged, the arc-shaped nozzle's back pressure pushes the wedge block to unlock. The inner cylinder, aided by a reset spring, brings the nozzle closer to the filter, shortening the airflow distance and increasing impact pressure. This, combined with a pneumatic vibrator, cracks sulfate scale. Furthermore, the nozzle's tangential jet spray reaches deep into the folds and "valleys," eliminating cleaning dead zones and significantly reducing filter replacements.

[0033] This invention features adaptive operation that eliminates manual intervention, reducing maintenance costs. No manual detection of blockages is required; airflow back pressure automatically triggers cleaning. After cleaning, the reset hook plate and elastic buckle plate work together to automatically reset the inner cylinder, outer pipe, and nozzle, with wedge-shaped synchronous locking. When the nozzle is not in use, the air guide plate adheres and seals to prevent dust adhesion, reducing maintenance and lowering labor and maintenance costs.

[0034] This invention protects equipment components and extends their service life; it keeps the nozzle tilted when it approaches the filter screen to avoid vertical impact that could damage the filter screen; the inner cylinder and outer tube slide with damping, and the rotating shaft slides along the arc surface of the limiting crank to ensure smooth movement without rigid collisions; the vibrator transmits vibration through sliding rather than impact, and is combined with a return spring and tension spring for buffering, reducing component wear and extending equipment life. Attached Figure Description

[0035] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0036] Figure 2 This is a partial three-dimensional structural cross-sectional view of the present invention;

[0037] Figure 3 This is a partial three-dimensional unfolded structural cross-sectional view of the present invention;

[0038] Figure 4 This is a three-dimensional structural diagram of the limiting curved rod and the vertical hinge rod of the present invention;

[0039] Figure 5 This is a three-dimensional structural diagram of the inner cylinder and the rotating shaft of the present invention;

[0040] Figure 6 This is a three-dimensional structural diagram of the first wedge-shaped card block plate and the second wedge-shaped card block plate of the present invention;

[0041] Figure 7 This is a three-dimensional cross-sectional view of the outer tube and inner cylinder of the present invention;

[0042] Figure 8 This is a three-dimensional structural diagram of the fixed air guide plate and the movable air guide plate of the present invention.

[0043] 1. Hollow mounting plate; 2. Pleated cylindrical filter screen; 3. Drive cylinder; 4. Drive ring; 41. Limiting crank; 42. Vertical hinge rod; 43. Outer tube; 44. Limiting plate; 45. Arc-shaped nozzle; 451. Fixed air guide plate; 452. Movable air guide plate; 453. High-temperature resistant spring telescopic rod; 454. Arc-shaped extrusion block; 46. Return spring; 47. Release cylinder; 48. Passive wedge block; 49. Active wedge block; 410. First wedge locking plate; 411. Second wedge locking plate; 412. Return wedge block; 5. Inner cylinder; 51. Groove; 52. Rotating shaft; 53. Elastic buckle plate; 54. T-shaped cylindrical seat; 55. Tension spring; 56. Return spring telescopic rod; 6. Return hook plate; 7. Curved inner groove; 8. Piston-type pneumatic vibrator. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Please see Figures 1 to 8This invention provides a technical solution: a waste gas purification device for magnesium sulfate production, comprising a hollow mounting plate 1 installed inside a gas transmission pipeline, on which a pleated cylindrical filter screen 2 for filtering waste gas is installed. The pleated cylindrical filter screen 2 increases the filtration area, reducing the dust load per unit area and slowing down the clogging rate, which is especially important for the sticky magnesium dust in magnesium sulfate production. A drive cylinder 3 is installed on the hollow mounting plate 1, with the extension end of the drive cylinder 3 facing downwards, and a drive ring 4 fixedly connected to its lower end. The bottom of the drive ring 4 is slidably connected to multiple... There are multiple limiting cranks 41, with two limiting cranks 41 forming a group. The end of the limiting crank 41 away from the drive ring 4 is fixedly connected to a vertical hinge rod 42. The two vertical hinge rods 42 are rotatably connected to an inclined outer tube 43. A limiting disk 44 is slidably provided on the bottom of the inner wall of the outer tube 43 along the axial direction of the outer tube 43. An arc-shaped nozzle 45 is installed on the side of the limiting disk 44 away from the outer tube 43, and the jet end of the arc-shaped nozzle 45 is inclined toward the outer wall of the pleated cylindrical filter screen 2 for cleaning the dust and impurities filtered on the outer wall of the pleated cylindrical filter screen 2.

[0046] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, the inner wall of the outer tube 43 is provided with a receiving groove, and a return spring 46 is fixedly connected in the receiving groove of the outer tube 43. There is a release cylinder 47 on the inner side of the return spring 46. A passive wedge block 48 is fixedly connected to one end of the release cylinder 47 facing the limiting plate 44, and an active wedge block 49 is on the side of the passive wedge block 48 facing the limiting plate 44. The active wedge block 49 is fixed on the end of the limiting plate 44, and the active wedge block 49 can deflect the release cylinder 47 by pressing the passive wedge block 48.

[0047] The end of the release cylinder 47 away from the limiting plate 44 is fixedly connected to a first wedge-shaped locking plate 410. A second wedge-shaped locking plate 411 abuts against the wedge-shaped block of the first wedge-shaped locking plate 410. The second wedge-shaped locking plate 411 is fixed on the end face of the outer tube 43, and the inclined surface of the wedge-shaped block on the first wedge-shaped locking plate 410 and the inclined surface of the wedge-shaped block on the second wedge-shaped locking plate 411 are arranged facing each other.

[0048] A reset wedge block 412, which is longitudinally misaligned with the wedge block on the first wedge block plate 410, is also fixedly connected to the outer tube 43.

[0049] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8As shown, an inner cylinder 5 is rotatably connected inside the release cylinder 47, and the inner cylinder 5 is damped and axially limited and slidably disposed inside the outer tube 43 and connected to the end of the return spring 46 away from the outer tube 43. When the inclined surface of the wedge block on the first wedge block plate 410 abuts against the second wedge block plate 411, the return spring 46 is in a compressed state. The inner cylinder 5 is also provided with a groove 51 to accommodate the deflection of the first wedge block plate 410.

[0050] The inner cylinder 5 has two symmetrically arranged rotating shafts 52 rotatably connected to its outer side. The two rotating shafts 52 correspond one-to-one with two limit cranks 41 as a group and abut against the bend of the limit cranks 41. The top of the inner cylinder 5 has two symmetrically arranged elastic buckles 53.

[0051] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, one end of each of the two elastic buckle plates 53 is hinged to a T-shaped cylindrical seat 54, and a return spring telescopic rod 56 is hinged between the disc-shaped end of the T-shaped cylindrical seat 54 and the elastic buckle plate 53. A tension spring 55 is provided on the vertical rod of the T-shaped cylindrical seat 54. The vertical rod of the T-shaped cylindrical seat 54 is slidably inserted into the inner cylinder 5, and one end of the tension spring 55 is fixed on the vertical rod of the T-shaped cylindrical seat 54, and the other end is fixed on the inner wall of the inner cylinder 5.

[0052] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, a fixed air guide plate 451 is fixedly connected to the jet end of the arc-shaped nozzle 45, and a movable air guide plate 452 is also slidably mounted on the arc-shaped nozzle 45. The movable air guide plate 452 is positioned opposite to the fixed air guide plate 451 to guide the gas ejected from the arc-shaped nozzle 45, and a high-temperature resistant spring telescopic rod 453 connects the two. When the arc-shaped nozzle 45 is not in use, the movable air guide plate 452 presses the arc-shaped pressing block 454, causing the movable air guide plate 452 to fit against the fixed air guide plate 451, thus sealing the arc-shaped nozzle 45 and preventing it from adhering to dust in the exhaust gas. When the arc-shaped nozzle 45 is in use, the movable air guide plate 452 separates from the arc-shaped pressing block 454 when the arc-shaped nozzle 45 moves down, causing the arc-shaped nozzle 45 to open.

[0053] One end of the movable air guide plate 452 abuts against the arc-shaped extrusion block 454, and the arc-shaped extrusion block 454 is fixed on the bottom of the hollow mounting plate 1. The arc-shaped nozzle 45 is a pulse nozzle, and the end of the arc-shaped nozzle 45 is connected to a high-pressure tank, which is located outside the gas transmission pipeline. A pulse controller and a pulse valve are installed on the high-pressure tank. The pulse controller controls the pulse valve to open or close, so that the gas in the high-pressure tank is ejected from the arc-shaped nozzle 45 to achieve the purpose of cleaning the pleated cylindrical filter screen 2. This is existing technology and will not be described in detail here.

[0054] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, a reset hook plate 6 is fixedly connected to the bottom of the hollow mounting plate 1, and the reset hook plate 6 and the inner cylinder 5 are on the same vertical plane. When the reset hook plate 6 is fastened to the ends of the two elastic buckles 53, it can pull the two elastic buckles 53 to deflect, thereby pulling the inner cylinder 5 on the elastic buckles 53 to deflect and reset.

[0055] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, the drive ring 4 is annular, and the drive ring 4 is provided with a curved inner groove 7. The drive ring 4 slides longitudinally on the outside of the reset hook plate 6 through the curved inner groove 7.

[0056] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, a piston-type pneumatic vibrator 8 is installed at the bottom of the drive ring 4, and the piston-type pneumatic vibrator 8 abuts against the pleated cylindrical filter screen 2, and it can slide up and down along the pleated cylindrical filter screen 2. The air inlet pipe of the piston-type pneumatic vibrator 8 is connected to an air compressor installed outside the air delivery pipeline.

[0057] The method of use and advantages of this invention: The working process of this waste gas purification device for magnesium sulfate production is as follows:

[0058] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown;

[0059] S1: Normal filtration stage: When the exhaust gas flows in the gas transmission pipeline, it is filtered through the outer wall of the pleated cylindrical filter screen 2 on the hollow mounting plate 1. At this time, dust is collected on the outer wall of the cylindrical filter screen 2. The pleated structure of the filter screen expands the filtration area, reduces the dust load per unit area, delays clogging, and is suitable for the filtration needs of sticky magnesium dust in magnesium sulfate production.

[0060] S2: Routine cleaning stage, targeting dust on the surface and in the "valleys" of folds;

[0061] After the device has been running for a period of time, the conveying of magnesium sulfate waste gas is stopped, and a dust collection hopper is placed directly below the pleated cylindrical filter screen 2; the drive cylinder 3 slowly extends, driving the drive ring 4 to move down, and at the same time the piston-type pneumatic vibrator 8 is started, transmitting the vibration force to the surface of the filter screen 2 to loosen the attached dust.

[0062] The drive ring 4 moves down, synchronously driving the arc-shaped nozzle 45 to move down. The inclined nozzle 45 performs pulse jet spray. The airflow penetrates deep into the fold "valley" along the circumferential tangent of the filter screen 2. Combined with vibration, it blows away the loosened dust, and the dust falls into the dust collection hopper.

[0063] S3: Precision cleaning stage for severe blockages, targeting sticky dust clumps / sulfate scale;

[0064] When the filter screen 2 is clogged, the resistance of the nozzle 45 jetting air through the filter screen increases, and the nozzle forms an "airflow back pressure". The back pressure pushes the active wedge block 49 on the nozzle 45 to squeeze the passive wedge block 48, causing the first wedge-shaped locking plate 410 on the release cylinder 47 to rotate counterclockwise and separate from the second wedge-shaped locking plate 411 to unlock. Under the action of the reset force of the reset spring 46, the inner cylinder 5 extends out from the outer tube 43, and the rotating shaft 52 slides along the inner side of the limiting crank 41, causing the nozzle 45 to deflect closer to the surface of the filter screen 2 but not perpendicular.

[0065] The nozzle 45, once close, pulses air again, shortening the airflow propagation distance and reducing attenuation, while increasing the impact pressure to disperse the sticky dust clumps; at the same time, the pneumatic vibrator 8 continues to work, cracking sulfate scale and achieving precise local cleaning.

[0066] S4: Automatic reset phase;

[0067] After the inner cylinder 5 is fully extended, the drive cylinder 3 continues to extend. The elastic buckle plate 53 on the inner cylinder 5 hooks with the reset hook plate 6. The hook plate 6 pulls the buckle plate 53, causing the T-shaped cylindrical seat 54 to be pulled out from the inner cylinder 5, increasing the length of the power lever, causing the inner cylinder 5 and the outer tube 43 to deflect, and the nozzle 45 begins to reset.

[0068] When the inner cylinder 5 deflects, the rotating shaft 52 slides along the arc surface of the limiting crank 41, pressing the inner cylinder 5 back to the outer tube 43 and compressing the reset spring 46; after the rotating shaft 52 passes the highest point of the arc surface, the first wedge-shaped locking plate 410 moves down to squeeze the reset wedge-shaped block 412, driving the release cylinder 47 to rotate clockwise to reset and re-engage and lock with the second wedge-shaped locking plate 411.

[0069] The reset hook plate 6 continues to pull the elastic buckle plate 53, and the end of the buckle plate 53 squeezes the reset spring telescopic rod 56 to compress it, and the two separate; the rotating shaft 52, under the action of the reset spring 46, abuts against the bend of the limiting crank 41, and the nozzle 45 returns to its tilted state; this process is repeated to switch and clean the surface of the pleated cylindrical filter screen 2.

[0070] After cleaning is completed, the drive cylinder 3 retracts, driving the nozzle 45 back to its initial position, and the device can re-enter the filtration state.

[0071] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A waste gas purification device for magnesium sulfate production, comprising: Hollow mounting disc (1) in gas pipeline; Folding cylinder filter screen (2) fixed on hollow mounting disc (1) for filtering exhaust gas; Driving cylinder (3) vertically mounted on hollow mounting disc (1), the telescopic end of which is connected with driving ring (4) downward; Its characterized in that: a plurality of groups of limiting curved rods (41) are slidingly connected to the bottom of driving ring (4), and the end of each group of limiting curved rods (41) away from driving ring (4) is connected with vertical hinged rod (42); two groups of vertical hinged rods (42) are rotationally connected with inclined outer tube (43) therebetween; Limiting disc (44) axially limited sliding along outer tube (43), and arc-shaped nozzle (45) is mounted on one side of limiting disc (44) to spray gas to the outer wall of inclined folding cylinder filter screen (2); The inner wall of outer tube (43) is provided with accommodating groove, and pre-compressed reset spring (46) is fixed in the accommodating groove; release rotary cylinder (47) is arranged on the inner side of reset spring (46); Release rotary cylinder (47) is connected with passive wedge-shaped block (48) at one end thereof towards limiting disc (44); and active wedge-shaped block (49) is connected with the end of limiting disc (44); When the folding cylinder filter screen (2) is severely blocked to cause back pressure of gas flow in the nozzle of arc-shaped nozzle (45), active wedge-shaped block (49) extrudes passive wedge-shaped block (48) to drive release rotary cylinder (47) to deflect; Inner cylinder body (5) is rotationally connected in release rotary cylinder (47); and reset spring (46) is connected to the end of inner cylinder body (5) away from outer tube (43); and rotating shaft (52) is rotationally connected to the outer side of inner cylinder body (5) to abut against the bending part of limiting curved rod (41); After release rotary cylinder (47) deflects, inner cylinder body (5) deflects with outer tube (43) by the reset force of reset spring (46), so that arc-shaped nozzle (45) is close to the blocked area to realize accurate and intensified gas cleaning; The end of release rotary cylinder (47) away from limiting disc (44) is connected with first wedge-shaped clamping block plate (410); and second wedge-shaped clamping block plate (411) is connected to the end face of outer tube (43) to abut against the inclined surface of first wedge-shaped clamping block plate (410); Reset wedge-shaped block (412) is longitudinally misaligned with first wedge-shaped clamping block plate (410) and connected to outer tube (43); When active wedge-shaped block (49) extrudes passive wedge-shaped block (48), first and second wedge-shaped clamping block plates (410, 411) are separated to unlock inner cylinder body (5); When reset after cleaning, first wedge-shaped clamping block plate (410) extrudes reset wedge-shaped block (412) to drive release rotary cylinder (47) to reset and abut against second wedge-shaped clamping block plate (411) again; Groove (51) is arranged on inner cylinder body (5) to accommodate the deflection of first wedge-shaped clamping block plate (410); and symmetrical elastic clamping plates (53) are arranged on the top of groove (51); One end of elastic clamping plate (53) is hingedly connected with T-shaped cylindrical seat (54); the vertical rod of T-shaped cylindrical seat (54) is slidingly inserted into inner cylinder body (5); and pull spring (55) is sleeved on the vertical rod of T-shaped cylindrical seat (54); and the two ends of pull spring (55) are connected to the vertical rod of T-shaped cylindrical seat (54) and the inner wall of inner cylinder body (5); Reset spring telescopic rod (56) is hingedly connected between the disc end of T-shaped cylindrical seat (54) and elastic clamping plate (53); Reset hook plate (6) is connected to the bottom of hollow mounting disc (1) and is coplanar with inner cylinder body (5); When the inner cylinder (5) is fully extended, the reset hook plate (6) is buckled with the elastic buckle plate (53), the elastic buckle plate (53) is pulled to deflect the inner cylinder (5) and the outer tube (43) to reset, so that the arc-shaped nozzle (45) returns to the initial inclined position; the driving ring (4) is provided with a curved inner groove (7), the driving ring (4) slides along the reset hook plate (6) to avoid interference, and the nozzle deflection and reset are accurate.

2. The waste gas purification device for magnesium sulfate production according to claim 1, characterized in that: The bottom of the driving ring (4) is provided with a piston type pneumatic vibrator (8) abutting against the outer wall of the pleated cylindrical filter screen (2); When the arc-shaped nozzle (45) is close to the blocked area, the piston type pneumatic vibrator (8) operates synchronously, and the vibration force cooperates with the airflow impact to crack the sulfate scale.

3. The waste gas purification device for magnesium sulfate production according to claim 1, characterized in that: The arc-shaped nozzle (45) is a pulse nozzle.

4. The waste gas purification device for magnesium sulfate production according to claim 1, characterized in that: The air outlet end of the arc-shaped nozzle (45) is connected with a fixed air guide plate (451), and an opposite movable air guide plate (452) is slidably arranged on the fixed air guide plate (451), and a high-temperature-resistant spring telescopic rod (453) is connected between the fixed air guide plate (451) and the movable air guide plate (452). The bottom of the hollow mounting disc (1) is connected with an arc surface extrusion block (454) abutting against the movable air guide plate (452); during non-cleaning, the movable and fixed air guide plates (452, 451) are attached to block the nozzle to prevent dust adhesion; during cleaning, the movable and fixed air guide plates (452, 451) are separated to ensure that the airflow is accurately sprayed out.

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