An automatic ash cleaning structure, a tubular heat exchanger with the structure and an ash removing method thereof

Abstract

The application relates to the technical field of heat exchangers, in particular to an automatic dust cleaning structure, a tubular heat exchanger with the structure and a dust cleaning method of the heat exchanger, which is used for wiping the outer wall of a heat exchange pipe of a heat exchanger body, and the heat exchanger body is installed on a base. The automatic dust cleaning structure comprises a circular ring movably arranged on the base and connected with a bidirectional driving mechanism installed on the base, the bidirectional driving mechanism can drive the circular ring to move along the axial direction of the heat exchanger body, and a dust suction mechanism is further arranged on the circular ring and connected with the bidirectional driving mechanism. Two arc-shaped plates are arranged in the circular ring, and the inner wall of each arc-shaped plate is provided with fluff. Finally, the dust cleaning effect and efficiency are greatly improved, the problem that the heat exchange efficiency of the heat exchanger body is reduced due to long-time dust accumulation and the normal use of the heat exchanger body is seriously affected is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchangers, and in particular to an automatic dust cleaning structure, a tubular heat exchanger having the same, and a dust cleaning method thereof. BACKGROUND

[0002] A tubular heat exchanger is a common energy-saving device for realizing heat transfer between fluids, which can effectively improve the utilization rate of energy by transferring heat from a fluid with a higher temperature to a fluid with a lower temperature. In some industrial fields, a large amount of high-temperature flue gas is generated during the production process. Generally, the use of a tubular heat exchanger can well solve the problem of flue gas waste heat recovery.

[0003] However, the high-temperature flue gas generated by industry contains a large amount of dust or slag. During the waste heat recovery process, dust or slag is easily adsorbed or adhered to the outer wall of the heat exchange tube. Long-term dust accumulation can reduce the heat exchange efficiency of the heat exchanger and seriously affect the normal use of the heat exchanger.

[0004] The existing dust cleaning device usually uses a brush to wipe at the same pressure. Since the dust accumulated on the heat exchange tube can be thick, a small force cannot guarantee complete cleaning, and a large force can easily cause the dust to harden and be difficult to fall off, which cannot achieve the ideal cleaning effect. SUMMARY

[0005] The present application aims to provide an automatic dust cleaning structure, a tubular heat exchanger having the same, and a dust cleaning method thereof to solve the problems raised in the background.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0007] An automatic dust cleaning structure is used to wipe the outer wall of the heat exchange tube of a heat exchanger body, wherein the heat exchanger body is installed on a base;

[0008] The automatic dust cleaning structure comprises:

[0009] A circular ring is movably arranged on the base and connected with a bidirectional driving mechanism installed on the base. The bidirectional driving mechanism can drive the circular ring to move along the axial direction of the heat exchanger body. A dust suction mechanism is further arranged on the circular ring and connected with the bidirectional driving mechanism;

[0010] Two arc-shaped plates are arranged in the circular ring. The inner wall of each arc-shaped plate is provided with a velvet for wiping the outer wall of the heat exchange tube of the heat exchanger body. The arc-shaped plates are connected with an elastic supporting mechanism installed on the circular ring, and the elastic supporting mechanism is connected with a one-way triggering mechanism;

[0011] The one-way triggering mechanism triggers at the end of the circular motion stroke, drives the elastic supporting mechanism to move, and changes the pressure of the arc-shaped plate on the outer wall of the heat exchange tube of the heat exchanger body.

[0012] As a further scheme of the present application, the elastic supporting mechanism comprises a threaded fitting assembly mounted on the circular ring and an elastic sliding assembly connecting the threaded fitting assembly and the arc-shaped plate, and the threaded fitting assembly is connected with the one-way triggering mechanism.

[0013] As a further scheme of the present application, the threaded fitting assembly comprises a second threaded rod rotatably mounted on the circular ring and a second threaded sleeve sleeved on the second threaded rod, the second threaded sleeve is threadedly connected with the second threaded rod, the second threaded rod is connected with the one-way triggering mechanism, and the second threaded sleeve is connected with the elastic sliding assembly.

[0014] As a further scheme of the present application, the elastic sliding assembly comprises two vertical columns fixed on the arc-shaped plate, a sliding plate slidably connected with the two vertical columns, and two columnar springs respectively sleeved on the outer periphery of the two vertical columns, one end of the columnar spring is connected with the arc-shaped plate, the other end is connected with the sliding plate, one end of the second threaded sleeve away from the inner wall of the circular ring is fixedly connected with the sliding plate, one side of the sliding plate is further fixed with a guide column, the guide column penetrates through a protruding block fixed on the circular ring and is slidably connected with the protruding block.

[0015] As a further scheme of the present application, the one-way triggering mechanism comprises a first ratchet fixedly mounted on the second threaded rod, a second ratchet, and a cross plate fixedly mounted on the base.

[0016] The first assembly plate and the second assembly plate are fixedly mounted with the cross plate, the first assembly plate and the second assembly plate are arranged in a staggered manner, and a plurality of inclined grooves are equidistantly arranged on the first assembly plate and the second assembly plate along the length direction, a pawl is hingedly connected in each inclined groove, a torsion spring is arranged between the pawl and the inner wall of the inclined groove, and the directions of the pawls on the first assembly plate and the second assembly plate are opposite.

[0017] As a further scheme of the present application, the two-way driving mechanism comprises a first threaded rod rotatably mounted on the base, a first threaded sleeve sleeved on the first threaded rod, and a driving motor mounted on the base.

[0018] The output end of the driving motor is connected with the first threaded rod, the first threaded sleeve is threadedly connected with the first threaded rod, and the first threaded sleeve is fixed with the circular ring.

[0019] As a further further scheme of the present application, the dust suction mechanism comprises a gas pump mounted on the ring, the gas pump is connected with the dust suction head through an air inlet, and the driving shaft of the gas pump is connected with the first threaded rod through a transmission mechanism.

[0020] As a further further scheme of the present application, the transmission mechanism comprises a rotating shaft rotatably mounted on the base and a sleeve slidably sleeved on the rotating shaft, the rotating shaft is connected with the first threaded rod through a first transmission belt, the sleeve is connected with the output shaft of the gas pump through a second transmission belt, two strip-shaped protrusions are arranged on the outer wall of the rotating shaft, and two strip-shaped grooves matched with the strip-shaped protrusions are arranged on the inner wall of the sleeve.

[0021] A tubular heat exchanger comprising the automatic ash removal structure.

[0022] An ash removal method of the tubular heat exchanger, comprising the following steps.

[0023] Step one, the bidirectional driving mechanism works in the forward direction to drive the ring to move in the forward direction along the axial direction of the heat exchanger body;

[0024] Step two, the elastic supporting mechanism promotes the arc-shaped plate to exert pressure on the heat exchange pipe, the arc-shaped plate removes the dust accumulated on the heat exchange pipe, the bidirectional driving mechanism drives the dust suction mechanism to work, the dust suction mechanism absorbs and transfers the removed dust, and the heat exchange pipe is subjected to primary ash removal;

[0025] Step three, the one-way triggering mechanism is triggered, the pressure exerted by the arc-shaped plate on the heat exchange pipe is reduced, the bidirectional driving mechanism works in the reverse direction to perform secondary ash removal on the heat exchange pipe;

[0026] Step four, the one-way triggering mechanism is triggered again, the elastic supporting mechanism moves to increase the pressure exerted by the arc-shaped plate on the heat exchange pipe.

[0027] Compared with the prior art, the application has the advantages that: the novel design of the application, in actual use, the bidirectional driving mechanism drives the circular ring to reciprocate along the axial direction of the heat exchanger body, the elastic supporting mechanism provides a supporting force to the arc-shaped plate, so that the fluff on the inner wall of the arc-shaped plate is tightly attached to the outer wall of the heat exchanger body heat exchange pipe, and in the latter end stroke of the movement of the circular ring towards one side, the elastic supporting mechanism is triggered, so as to reduce the pressure of the arc-shaped plate on the outer wall of the heat exchanger body heat exchange pipe, and in the resetting process of the movement of the circular ring towards the other side, the fluff on the inner wall of the arc-shaped plate is brushed on the outer wall of the heat exchange pipe, so that the dust falls off the outer wall of the heat exchange pipe, at the same time, the bidirectional driving mechanism drives the dust collection mechanism to move, and the dust collection mechanism absorbs the dust, through the cooperation between various mechanisms and components, different degrees of wiping can be performed on the outer wall of the heat exchange pipe during each cleaning, the thicker dust accumulated on the outer wall of the heat exchange pipe is first wiped off using a larger force, and then the fluff on the inner wall of the arc-shaped plate is brushed on the outer wall of the heat exchange pipe using a smaller force, so that the remaining dust can be smoothly removed from the outer wall of the heat exchange pipe, and the floating dust is absorbed and treated by the dust collection mechanism, thus, the dust removal effect and efficiency are greatly improved, the problem of reduction of the heat exchange efficiency of the heat exchanger body due to long-term dust accumulation is avoided, and the normal use of the heat exchanger body is not affected, and the application is suitable for popularization and use. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 Structure schematic view of one embodiment of the automatic dust removal structure.

[0029] Figure 2 Structure schematic view of another angle of one embodiment of the automatic dust removal structure.

[0030] Figure 3 Structure schematic view of still another angle of one embodiment of the automatic dust removal structure.

[0031] Figure 4 Structure schematic view of one embodiment of the automatic dust removal structure. Figure 3 Structure enlarged view of A in FIG.

[0032] Figure 5 Structure schematic view of the elastic supporting mechanism in one embodiment of the automatic dust removal structure.

[0033] Figure 6 Structure schematic view of one embodiment of the automatic dust removal structure. Figure 5 Structure enlarged view of B in FIG.

[0034] Figure 7 Structure exploded view of the elastic supporting mechanism in one embodiment of the automatic dust removal structure.

[0035] In the figure: 1, base; 2, heat exchanger body; 3, ring; 4, driving motor; 5, first threaded rod; 6, first threaded sleeve; 7, first transmission belt; 8, rotating shaft; 9, sleeve; 10, arc plate; 11, stand; 12, second threaded rod; 13, second threaded sleeve; 14, sliding plate; 15, cylindrical spring; 16, guide column; 17, protruding block; 18, cross plate; 19, first ratchet; 20, second ratchet; 21, first assembly plate; 22, second assembly plate; 23, air pump; 24, second transmission belt; 25, strip-shaped protrusion; 26, strip-shaped groove; 27, dust collecting head. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0037] In addition, the elements in the present application are referred to as "fixed to" or "provided on" another element, which can be directly on another element or can have a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or can have a middle element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0038] Please refer to Figures 1-7 In the embodiments of the present application, an automatic dust cleaning structure is used to wipe the outer wall of the heat exchange pipe of the heat exchanger body 2, and the heat exchanger body 2 is installed on the base 1.

[0039] The automatic dust cleaning structure comprises:

[0040] The ring 3 is movably arranged on the base 1 and connected with a bidirectional driving mechanism installed on the base 1, the bidirectional driving mechanism can drive the ring 3 to move along the axial direction of the heat exchanger body 2, and the ring 3 is further provided with a dust collecting mechanism connected with the bidirectional driving mechanism.

[0041] The arc-shaped plates 10 are arranged in the ring 3, the inner wall of the arc-shaped plate 10 is provided with fluff for wiping the outer wall of the heat exchange pipe of the heat exchanger body 2, and the arc-shaped plate 10 is connected with an elastic supporting mechanism installed on the ring 3, and the elastic supporting mechanism is connected with a one-way triggering mechanism.

[0042] The one-way triggering mechanism triggers at the end of the movement of the ring 3 and drives the elastic supporting mechanism to move, so as to change the pressure of the arc-shaped plate 10 on the outer wall of the heat exchanger body 2.

[0043] In actual use, the bidirectional driving mechanism drives the ring 3 to reciprocate along the axial direction of the heat exchanger body 2, and the elastic supporting mechanism provides a supporting force to the arc-shaped plate 10, so that the fluff on the inner wall of the arc-shaped plate 10 is in close contact with the outer wall of the heat exchanger body 2. In the latter end of the movement of the ring 3 towards one side, the elastic supporting mechanism is triggered, so as to reduce the pressure of the arc-shaped plate 10 on the outer wall of the heat exchanger body 2. During the resetting process of the ring 3 towards the other side, the fluff on the inner wall of the arc-shaped plate 10 is brushed on the outer wall of the heat exchanger body 2, so that the dust falls off the outer wall of the heat exchanger body 2. At the same time, the bidirectional driving mechanism drives the dust collection mechanism to move, and the dust collection mechanism collects the dust.

[0044] In summary, through the cooperation between each mechanism and component, different wiping forces can be applied to the outer wall of the heat exchanger tube during each cleaning process. First, a larger force is used for wiping to ensure that the thick dust accumulated on the outer wall of the heat exchanger tube is removed. Then, a smaller force is used for wiping, so that the fluff on the inner wall of the arc-shaped plate 10 is brushed on the outer wall of the heat exchanger tube, ensuring that the remaining dust can be easily removed from the outer wall of the heat exchanger tube and collected by the dust collection mechanism. Therefore, the dust removal effect and efficiency are greatly improved, and the problem of reduced heat exchange efficiency of the heat exchanger body 2 caused by long-term dust accumulation is avoided, which seriously affects the normal use of the heat exchanger body 2. The problem is suitable for popularization and use.

[0045] Please refer to Figure 5 , Figure 6 and Figure 7 again. The elastic supporting mechanism comprises a threaded fitting assembly installed on the ring 3 and an elastic sliding assembly connecting the threaded fitting assembly and the arc-shaped plate 10, and the threaded fitting assembly is connected with the one-way triggering mechanism.

[0046] The threaded fitting assembly comprises a second threaded rod 12 rotatably installed on the ring 3 and a second threaded sleeve 13 sleeved on the second threaded rod 12. The second threaded sleeve 13 is threadedly connected with the second threaded rod 12. The second threaded rod 12 is connected with the one-way triggering mechanism, and the second threaded sleeve 13 is connected with the elastic sliding assembly.

[0047] The elastic sliding assembly comprises two vertical columns 11 fixed on the arc-shaped plate 10, a sliding plate 14 in sliding connection with the two vertical columns 11, and two columnar springs 15 respectively sleeved on the outer periphery of the two vertical columns 11, one end of the columnar spring 15 being connected with the arc-shaped plate 10 and the other end being connected with the sliding plate 14, and one end of the second threaded sleeve 13 away from the inner wall of the ring 3 being fixedly connected with the sliding plate 14. One side of the sliding plate 14 is further fixed with a guide column 16 penetrating through a protruding block 17 fixed on the ring 3 and in sliding connection with the protruding block 17.

[0048] The one-way triggering mechanism comprises a first ratchet wheel 19 and a second ratchet wheel 20 fixedly installed on the second threaded rod 12 and a horizontal plate 18 fixedly installed on the base 1. The horizontal plate 18 is fixedly installed with a first assembly plate 21 and a second assembly plate 22, the first assembly plate 21 and the second assembly plate 22 are arranged in a staggered manner, and a plurality of inclined grooves are equidistantly arranged on the first assembly plate 21 and the second assembly plate 22 along the length direction, and a pawl is hingedly connected in each inclined groove, a torsional spring is arranged between the pawl and the inner wall of the inclined groove, and the pawls on the first assembly plate 21 and the second assembly plate 22 are oppositely directed.

[0049] In the first stroke of the movement of the ring 3 towards one side, the second ratchet wheel 20 will pass through the pawl on the second assembly plate 22, at this time, the pawl on the second assembly plate 22 will be deflected, the torsional spring will be deformed, and the second ratchet wheel 20 will not rotate. In this process, the fluff on the inner wall of the arc-shaped plate 10 preliminarily wipes the dust on the outer wall of the heat exchange tube of the heat exchanger body 2 with a larger force. In the second stroke of the movement of the ring 3, the first ratchet wheel 19 will pass through the pawl on the first assembly plate 21, and the pawl on the first assembly plate 21 cannot rotate, so that the first ratchet wheel 19 drives the second threaded rod 12 to rotate, the guide column 16 and the protruding block 17 play a guiding role, so that the second threaded sleeve 13 is in threaded cooperation with the second threaded rod 12, the second threaded sleeve 13 drives the sliding plate 14 to slide away from the arc-shaped plate 10 on the two vertical columns 11, correspondingly, the compression amount of the columnar spring 15 is reduced, the pressure of the arc-shaped plate 10 on the heat exchange tube of the heat exchanger body 2 is reduced, so that in the subsequent movement of the ring 3 towards the other side, the fluff on the inner wall of the arc-shaped plate 10 wipes over the outer wall of the heat exchange tube with a smaller force, ensuring that the residual dust can be smoothly removed from the outer wall of the heat exchange tube.

[0050] When the circular ring 3 moves towards the other side in the first stroke, the first ratchet 19 will pass the pawl on the first assembling plate 21 again, at this time, the pawl on the first assembling plate 21 will rotate, the first ratchet 19 will not rotate, and in the second stroke, the second ratchet 20 will pass the pawl on the second assembling plate 22 again, the pawl on the second assembling plate 22 will not rotate, so that the second ratchet 20 rotates, and then the second threaded sleeve 13 drives the sliding plate 14 to slide on the two posts 11 towards the arc-shaped plate 10, so that the compression amount of the cylindrical spring 15 is restored.

[0051] Please refer to Figure 2 , the bidirectional driving mechanism comprises a first threaded rod 5 rotatably installed on the base 1, a first threaded sleeve 6 sleeved on the first threaded rod 5, and a driving motor 4 installed on the base 1.

[0052] The output end of the driving motor 4 is connected with the first threaded rod 5, the first threaded sleeve 6 is threadedly connected with the first threaded rod 5, and is fixed with the circular ring 3.

[0053] It should be pointed out that, since the circular ring 3 needs to move bidirectionally when cleaning dust, the driving motor 4 is selected to be a servo motor with a bidirectional output end, and the type thereof is not limited in the present application, and can be selected according to actual needs.

[0054] Please refer to Figure 4 and Figure 5 , the dust collection mechanism comprises an air pump 23 installed on the circular ring 3, a dust collection head 27 connected with the air inlet of the air pump 23, and a driving shaft of the air pump 23 connected with the first threaded rod 5 through a transmission mechanism.

[0055] The transmission mechanism comprises a rotating shaft 8 rotatably installed on the base 1 and a sleeve 9 slidably sleeved on the rotating shaft 8, the rotating shaft 8 is connected with the first threaded rod 5 through a first transmission belt 7, the sleeve 9 is connected with the output shaft of the air pump 23 through a second transmission belt 24, two strip-shaped protrusions 25 are arranged on the outer wall of the rotating shaft 8, and two strip-shaped grooves 26 matched with the strip-shaped protrusions 25 are arranged on the inner wall of the sleeve 9.

[0056] When the driving motor 4 drives the first threaded rod 5 to rotate forward, the circular ring 3 moves away from the driving motor 4, and in this process, the compression amount of the cylindrical spring 15 is large, so in this process, the dust scraped off by the arc-shaped plate 10 is thick, at the same time, the first threaded rod 5 drives the rotating shaft 8 to rotate through the first transmission belt 7, the rotating shaft 8 drives the sleeve 9 to rotate through the strip-shaped protrusion 25 and the strip-shaped groove 26, and then the sleeve 9 drives the air pump 23 to work through the second transmission belt 24, so that the thick dust scraped off is sucked away by the dust collection head 27.

[0057] As another embodiment of the present application, a tubular heat exchanger is also provided, which comprises the automatic dust removal structure.

[0058] A dust removal method of the tubular heat exchanger, comprising the following steps:

[0059] Step one, the bidirectional driving mechanism works forward to drive the circular ring 3 to move forward along the axial direction of the heat exchanger body 2;

[0060] Step two, the elastic supporting mechanism promotes the arc-shaped plate 10 to exert pressure on the heat exchange pipe, the arc-shaped plate 10 scrapes off the dust accumulated on the heat exchange pipe, the bidirectional driving mechanism drives the dust collection mechanism to work, the dust collection mechanism absorbs and transfers the dust scraped off, and the heat exchange pipe is subjected to primary dust removal;

[0061] Step three, the one-way triggering mechanism is triggered, the pressure exerted by the arc-shaped plate 10 on the heat exchange pipe is reduced, and the bidirectional driving mechanism works reversely to perform secondary dust removal on the heat exchange pipe;

[0062] Step four, the one-way triggering mechanism is triggered again, the elastic supporting mechanism moves to promote the arc-shaped plate 10 to increase the pressure exerted on the heat exchange pipe.

[0063] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all aspects as exemplary and non-restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and range of equivalent elements of the claims are intended to be embraced in the present application. Any reference signs in the claims should not be considered as limiting the claims involved.

[0064] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature described. The specification can include implicit combinations of explicitly mentioned features and / or explicit combinations of implicitely mentioned features. Each embodiment depends on the explicit combinations of features and / or the implicit combinations of features made specifically within that embodiment, and each such embodiment can be combined with every other such embodiment to create further embodiments.

Claims

1. An automatic dust removal structure for wiping the outer wall of the heat exchange tube of a heat exchanger body (2), wherein the heat exchanger body (2) is mounted on a base (1); Its features are, include: A circular ring (3) is movably mounted on the base (1) and connected to a bidirectional drive mechanism mounted on the base (1). The bidirectional drive mechanism can drive the circular ring (3) to move along the axial direction of the heat exchanger body (2). The circular ring (3) is also provided with a dust collection mechanism, which is connected to the bidirectional drive mechanism. Two arc-shaped plates (10) are provided inside the ring (3). The inner wall of the arc-shaped plate (10) is provided with lint for wiping the outer wall of the heat exchange tube of the heat exchanger body (2). The arc-shaped plate (10) is connected to an elastic support mechanism installed on the ring (3). The elastic support mechanism is connected to a one-way triggering mechanism. The one-way triggering mechanism is triggered at the end of the stroke of the ring (3) and drives the elastic support mechanism to move, causing the pressure of the arc plate (10) on the outer wall of the heat exchange tube of the heat exchanger body (2) to change. The elastic support mechanism includes a threaded engagement assembly mounted on the ring (3) and an elastic sliding assembly connecting the threaded engagement assembly and the arc plate (10), and the threaded engagement assembly is connected to the one-way triggering mechanism; The threaded assembly includes a second threaded rod (12) rotatably mounted on the ring (3) and a second threaded sleeve (13) sleeved on the second threaded rod (12). The second threaded sleeve (13) is threadedly connected to the second threaded rod (12). The second threaded rod (12) is connected to the one-way triggering mechanism. The second threaded sleeve (13) is connected to the elastic sliding assembly. The elastic sliding assembly includes two columns (11) fixed on the arc plate (10), a sliding plate (14) slidably connected to the two columns (11), and two cylindrical springs (15) respectively sleeved on the outer periphery of the two columns (11). One end of the cylindrical spring (15) is connected to the arc plate (10), and the other end is connected to the sliding plate (14). The end of the second threaded sleeve (13) away from the inner wall of the ring (3) is fixedly connected to the sliding plate (14). Among them, a guide post (16) is fixed on one side of the sliding plate (14), and the guide post (16) passes through the protruding block (17) fixed on the ring (3) and is slidably connected with the protruding block (17); The one-way triggering mechanism includes a first ratchet (19), a second ratchet (20) fixedly mounted on the second threaded rod (12), and a horizontal plate (18) fixedly mounted on the base (1). The horizontal plate (18) is fixedly mounted with a first assembly plate (21) and a second assembly plate (22). The first assembly plate (21) and the second assembly plate (22) are staggered and both have multiple inclined grooves equidistantly arranged along the length direction. Each inclined groove is hinged with a pawl. A torsion spring is provided between the pawl and the inner wall of the inclined groove. The pawls on the first assembly plate (21) and the second assembly plate (22) face opposite directions.

2. The automatic dust removal structure according to claim 1, characterized in that, The bidirectional drive mechanism includes a first threaded rod (5) rotatably mounted on the base (1), a first threaded sleeve (6) sleeved on the first threaded rod (5), and a drive motor (4) mounted on the base (1). The output end of the drive motor (4) is connected to the first threaded rod (5), the first threaded sleeve (6) is threadedly connected to the first threaded rod (5) and fixed to the ring (3).

3. The automatic dust removal structure according to claim 2, characterized in that, The dust collection mechanism includes an air pump (23) mounted on the ring (3), the air inlet of the air pump (23) is connected to a dust collection head (27), and the drive shaft of the air pump (23) is connected to the first threaded rod (5) through a transmission mechanism.

4. The automatic dust removal structure according to claim 3, characterized in that, The transmission mechanism includes a rotating shaft (8) rotatably mounted on the base (1) and a sleeve (9) slidably sleeved on the rotating shaft (8). The rotating shaft (8) is connected to the first threaded rod (5) via a first transmission belt (7). The sleeve (9) is connected to the output shaft of the air pump (23) via a second transmission belt (24). The outer wall of the rotating shaft (8) is provided with two strip-shaped protrusions (25), and the inner wall of the sleeve (9) is provided with two strip-shaped grooves (26) that are adapted to the strip-shaped protrusions (25).

5. A tubular heat exchanger, characterized in that, Includes the automatic dust removal structure as described in claim 1.

6. A method for removing ash from a tubular heat exchanger as described in claim 5, characterized in that, Includes the following steps: Step 1: The bidirectional drive mechanism operates in the forward direction, driving the ring (3) to move in the forward direction along the axial direction of the heat exchanger body (2); Step 2: The elastic support mechanism causes the arc plate (10) to apply pressure to the heat exchange tube, and the arc plate (10) wipes away the dust accumulated on the heat exchange tube. The bidirectional drive mechanism drives the dust suction mechanism to work, and the dust suction mechanism absorbs and transfers the wiped-off dust to perform a dust removal process on the heat exchange tube. Step 3: The unidirectional triggering mechanism is triggered, the pressure applied by the arc plate (10) to the heat exchange tube decreases, and the bidirectional driving mechanism works in reverse to perform secondary ash removal on the heat exchange tube; Step four, the one-way triggering mechanism is triggered again, the elastic support mechanism moves, causing the pressure applied by the arc plate (10) to the heat exchange tube to increase.

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