Tube plate hole centering mechanism and centering method for ash removal of SAR heat energy recoverer

Abstract

The invention relates to the technical field of heat energy recoverers, in particular to an SAR heat energy recoverer deashing tube plate hole centering mechanism which comprises a machine table, a first sliding mechanism and a second sliding mechanism, and the first sliding mechanism and the second sliding mechanism slide above the machine table. Wherein a guide sleeve is mounted on the first sliding mechanism, an ash removal gun is movably inserted into the inner side of the guide sleeve, the free end of the guide sleeve is inserted along a tube plate hole of a smoke box, and a far-end supporting point is formed for the rod part of the ash removal gun; the guide sleeve enters the smoke box and supports and restrains the ash removal gun to center a heat exchanger pipe hole only when the ash removal gun enters the smoke box, the guide sleeve stops outside the smoke box in other time, and the problem that the guide sleeve deforms due to the influence of high temperature is greatly solved; therefore, the centering function of the ash removal gun is realized under the condition that the smoke box is not subjected to any structural change.

Description

Technical Field

[0001] The invention relates to the technical field of heat recovery devices, and in particular to a tube sheet hole centering mechanism and a centering method for cleaning SAR heat recovery devices. Background Art

[0002] In the spent acid regeneration (SAR) device, the heat recovery device is a key component, and its function is to absorb and utilize the heat energy carried by the high-temperature flue gas in the furnace. However, when the high-temperature flue gas passes through the heat exchanger of the heat recovery device, ash scale will form inside the tube. These ash scales not only affect the heat exchange efficiency, but also may cause the safety risk of tube burst. Therefore, it is necessary to clean the heat exchanger tubes regularly.

[0003] At present, the domestic method of cleaning the heat recovery device of the waste acid regeneration device mainly adopts the method of online cleaning gun. This method involves using a cleaning gun made of stainless steel pipe, which is inserted into the heat exchanger tube, and the ash is crushed by pushing and pushing out of the tube to complete the cleaning process. However, this online cleaning method requires manual operation and has safety hazards. For example, the operator may be directly exposed to high-temperature flue gas, resulting in occupational health problems such as burns or pneumoconiosis. In addition, manual cleaning is inefficient and economical.

[0004] In view of this, researching and developing an automated cleaning mode for the heat recovery device of the waste acid regeneration device has become an ideal solution. However, during the research process of automated cleaning, technical difficulties were encountered, namely, it was difficult for the cleaning gun to accurately align the heat exchanger tube hole. The structure of the heat recovery device required the cleaning gun to first pass through the tube sheet hole in front of the smoke box, and then pass through the internal space of the smoke box to reach the front of the heat exchanger tube sheet. Since the internal space of the smoke box is long and unsupported, the cleaning gun is prone to drooping and deformation in a high temperature environment, as shown in the attached figure of the manual. Figure 1 As shown in the figure, it is difficult to center the gun tip on the heat exchanger tube hole. In manual operation, this problem can be solved by real-time observation and manual adjustment, but it is difficult for automated equipment to independently judge and adapt to this uncertainty, making automated alignment difficult. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings in the prior art that after a slender cleaning gun enters the interior of the smoke box, due to the long overhang distance and being in a high temperature environment, the section of the cleaning gun entering the smoke box will produce a large droop and deformation, and a tube sheet hole centering mechanism and centering method for cleaning a SAR heat energy recovery device are proposed.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A tube sheet hole centering mechanism for cleaning SAR heat recovery device is designed, comprising a machine platform, a first sliding mechanism and a second sliding mechanism sliding above the machine platform;

[0008] A guide sleeve is installed on the first sliding mechanism, and a cleaning gun is movably inserted inside the guide sleeve. The free end of the guide sleeve is inserted along the tube plate hole of the smoke box and forms a distal support point for the rod of the cleaning gun.

[0009] A fixing mechanism for fixing the rear end of the cleaning gun is also installed on the second sliding mechanism.

[0010] Furthermore, the first sliding mechanism includes a slide seat slidably connected above the machine platform, and a power assembly is provided between the slide seat and the machine platform;

[0011] A support seat is fixedly mounted on the upper end of the slide seat, and the guide sleeve is fixed on the inner side of the support seat.

[0012] Furthermore, the power assembly includes a motor fixed on the slide seat, a gear is fixed on the shaft end of the motor, and a rack meshing with the gear is fixedly installed on the top of the machine.

[0013] Furthermore, the second sliding mechanism is structured similar to the first sliding mechanism.

[0014] Furthermore, the fixing mechanism includes a mounting seat installed on the second sliding mechanism and a fixing plate fixed on the side of the mounting seat, and a clamping structure and a plurality of supporting columns are arranged on the end surface of the fixing plate, and a placement space for accommodating the cleaning gun is formed between the plurality of supporting columns.

[0015] Furthermore, the clamping structure includes a clamping arm hinged to the side of the fixing plate, and a driving rod is movably inserted in the middle of the fixing plate;

[0016] The outer side of the driving rod is pin-connected and rotated with a connecting rod, and the far end of the connecting rod is pin-connected with the clamp arm.

[0017] Furthermore, an end seat is fixedly mounted on the end of the driving rod, and the connecting rod is pinned to the end seat;

[0018] A spring is fixedly connected between the end seat and the fixed plate, and a driving member for driving the driving rod to move is fixed to the back end of the mounting seat.

[0019] Furthermore, a groove is provided on the outer periphery of the driving rod along the axial direction, and a plurality of wedge-shaped teeth are distributed at intervals inside the groove;

[0020] A limiting plate is slidably connected to the end surface of the mounting seat via a compression spring, a through hole for accommodating the driving rod is opened on the end surface of the limiting plate, and a card fixedly installed in the through hole and locked between two adjacent wedge-shaped teeth, a magnet is arranged at the bottom of the limiting plate, and an electromagnet opposite to the magnet is arranged on the end surface of the mounting seat.

[0021] Furthermore, the guide sleeve has a hollow cavity, and a joint connected to the hollow cavity is installed on the outer side of the guide sleeve.

[0022] In addition, the present invention also proposes a tube sheet hole centering method for cleaning a SAR heat recovery device, which uses the above-mentioned mechanism, and the method includes:

[0023] Open the tube cover of the tube sheet hole of the smoke box, and move the machine so that the cleaning gun and the guide sleeve are facing the tube sheet hole in front;

[0024] The cleaning gun and the guide sleeve move forward synchronously and extend into the smoke box from the guide tube of the tube plate hole;

[0025] After the guide sleeve reaches the position inside the smoke box, it stops moving forward, and the cleaning gun continues to move forward until it is close to the heat exchanger pipe opening;

[0026] The cleaning gun head stops moving forward temporarily after entering the heat exchanger tube, and the guide sleeve exits the smoke box after the cleaning gun head enters the heat exchanger tube;

[0027] The cleaning gun continues to move forward, passing through the heat exchanger tube to clean the dust and dirt inside the tube;

[0028] After the cleaning gun has cleaned one heat exchanger tube, it exits the smoke box and moves to the next tube sheet hole to repeat the above sequence of actions.

[0029] The invention proposes a tube sheet hole centering mechanism and centering method for cleaning SAR heat recovery device, and has the beneficial effect that: the guide sleeve in the invention enters the smoke box together with the cleaning gun only when the cleaning gun enters the smoke box, and supports and constrains the cleaning gun to center the heat exchanger tube hole, and stays outside the smoke box at other times, which greatly reduces the problem of deformation caused by high temperature. In addition, the overall mechanism is a movable functional component and does not belong to the smoke box, so the centering function of the cleaning gun is realized without any structural change to the smoke box;

[0030] Secondly, the guide sleeve is small in size and does not take up too much space inside the smoke box, so it will not affect the smoke circulation inside the smoke box and has little effect on the heat exchange process parameters. At the same time, the guide sleeve adopts a hollow structure design, and a circulating cooling medium can be passed into the interior to cool the tube, preventing itself from thermal deformation and maintaining good rigidity to support the cleaning gun. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1It is a schematic diagram of the state of the dust cleaning rod in the prior art when it is in operation;

[0032] Figure 2 It is a structural schematic diagram of the present invention;

[0033] Figure 3 It is a schematic diagram of the cleaning gun and the guide sleeve in motion according to the present invention;

[0034] Figure 4 This is a schematic diagram of the guide sleeve of the present invention when it is retracted;

[0035] Figure 5 This is a schematic diagram of the cleaning gun of the present invention when it is centered;

[0036] Figure 6 This is a schematic diagram of the cleaning rod of the present invention during cleaning operation;

[0037] Figure 7 The fixing mechanism structure of the present invention is shown in FIG. Figure 1 ;

[0038] Figure 8 The fixing mechanism structure of the present invention is shown in FIG. Figure 2 ;

[0039] Fig. 9 for Figure 8 Schematic diagram of the enlarged structure of area A.

[0040] In the figure: 1. machine table; 2. first sliding mechanism; 21. slide seat; 22. power assembly; 3. second sliding mechanism; 4. guide sleeve; 41. support seat; 5. ash cleaning gun; 6. smoke box; 61. tube plate hole; 7. fixing mechanism; 71. mounting seat; 72. fixing plate; 73. clamping structure; 731. clamping arm; 732. driving rod; 733. connecting rod; 734. end seat; 735. spring; 736. driving member; 74. support column; 75. wedge-shaped tooth; 76. compression spring; 77. limit plate; 78. card; 79. magnet; 8. electromagnet. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0042] Reference Figure 2-9An embodiment of the present invention specifically discloses a tube sheet hole centering mechanism for cleaning a SAR heat energy recovery device, which provides a tube sheet hole centering mechanism for cleaning a SAR heat energy recovery device, and the mechanism can greatly reduce the deformation of the cleaning gun 5 in the smoke box, so that the cleaning gun 5 can be easily centered on the tube hole of the SAR heat energy recovery device heat exchanger, meeting the needs of automatic cleaning of the device, and the mechanism has a simple structure, reliable operation, and good centering effect.

[0043] Specifically, the mechanism includes a machine platform 1, a first sliding mechanism 2 and a second sliding mechanism 3 sliding on the machine platform 1. As a preferred embodiment, the machine platform 1 in this embodiment can be set as a lifting platform that can be raised and lowered. The lifting platform drives the first sliding mechanism 2 and the second sliding mechanism 3 to move up and down to achieve adaptation of tube sheet holes 61 at different heights. The lifting platform structure is a prior art and will not be described in detail here.

[0044] The first sliding mechanism 2 is provided with a guide sleeve 4, and a cleaning gun 5 is movably inserted inside the guide sleeve 4. The free end of the guide sleeve 4 is inserted along the tube plate hole 61 of the smoke box 6, and forms a distal support point for the rod of the cleaning gun 5.

[0045] A fixing mechanism 7 for fixing the tail end of the cleaning gun 5 is also installed on the second sliding mechanism 3 .

[0046] In some embodiments, the first sliding mechanism 2 of the present invention includes a slide seat 21 slidably connected to the top of the machine 1. The slide seat 21 described in this embodiment can be slidably connected to the machine 1 through a linear guide rail and a slider. Of course, the linear guide rail is fixed above the machine 1, and a power component 22 is provided between the slide seat 21 and the machine 1.

[0047] A support seat 41 is fixedly mounted on the upper end of the slide seat 21 , and the guide sleeve 4 is fixed on the inner side of the support seat 41 .

[0048] On the basis of the above embodiment, the power assembly 22 in this embodiment includes a motor fixed on the slide 21, a gear is fixed on the shaft end of the motor, and a rack meshing with the gear is fixed on the top of the machine 1.

[0049] During operation, the motor drives the gear to rotate. Since the gear is meshed with the rack, the entire slide 21 is driven to perform lateral displacement movement on the machine 1, so that the guide sleeve 4 can be controlled to move linearly and enter the interior of the smoke box 6 along the tube plate hole 61.

[0050] Furthermore, the preferred structure of the second sliding mechanism 3 and the first sliding mechanism 2, that is, the second sliding mechanism 3 also adopts a motor, a gear and a rack structure to drive the movement. Of course, the motor described in this embodiment is preferably set as a servo motor. During the initial movement, the two motors need to maintain synchronous movement to ensure that when the guide sleeve 4 is plugged into the pipe plate hole 61, the cleaning gun 5 can follow and move synchronously. Secondly, the control method of the first sliding mechanism 2 and the second sliding mechanism 3 is adopted to realize independent control of the guide sleeve 4 and the cleaning gun 5.

[0051] Reference Figure 7 , 8 In some embodiments, the fixing mechanism 7 in the present invention includes a mounting seat 71 installed on the second sliding mechanism 3 and a fixing plate 72 fixed on the side of the mounting seat 71. The mounting seat 71 is a U-shaped structure, which is fixed to the sliding seat 21 of the second sliding mechanism 3 by fasteners such as bolts. A clamping structure 73 and a plurality of support columns 74 are provided on the end surface of the fixing plate 72, and a placement space for accommodating the cleaning gun 5 is formed between the plurality of support columns 74.

[0052] Specifically, in an embodiment of the present invention, a plurality of support columns 74 are used to support the tail end of the cleaning gun 5 during initial installation. During installation, the tail end of the cleaning gun 5 is first inserted into the placement space formed by the plurality of support columns 74, and supported by the plurality of support columns 74 to facilitate subsequent clamping actions.

[0053] Reference Figure 7 On the basis of the above embodiment, the clamping structure 73 in this embodiment includes a clamping arm 731 hinged to the side of the fixing plate 72, and a driving rod 732 is movably inserted in the middle of the fixing plate 72;

[0054] A connecting rod 733 is rotatably connected to the outer side of the driving rod 732 by pins, and a distal end of the connecting rod 733 is pin-connected to the clamping arm 731 .

[0055] Furthermore, the clamping arms 731 and the support columns 74 described in this embodiment are both provided with three, and the clamping arms 731 and the support columns 74 are arranged in sequence at intervals. The movement of the clamping arms 731 is controlled by the driving rod 732. For example, when the driving rod 732 is pulled backward, it will drive the connecting rod 733 to move, and the connecting rod 733 will pull the clamping arms 731 to rotate to achieve the clamping action of the cleaning gun 5, so as to achieve the connection between the second sliding mechanism 3 and the cleaning gun 5, and ensure the stability of the subsequent drive

[0056] Reference Figure 7 In a preferred embodiment, the end of the driving rod 732 of the present invention is fixedly mounted with an end seat 734, and the connecting rod 733 is pin-connected to the end seat 734;

[0057] A spring 735 is fixedly connected between the end seat 734 and the fixed plate 72 , and the spring 735 is used to enhance the reset stability of the driving rod 732 . In addition, a driving member 736 for driving the driving rod 732 to move is fixed to the back end of the mounting seat 71 .

[0058] Specifically, the driving member 736 described in this embodiment is configured as a cylinder, which is fixed on the inner side of the mounting seat 71. A connecting plate is fixedly connected to the axial end of the cylinder, and the other end of the connecting plate is fixed to the end of the driving rod 732. During specific clamping, the axial end of the cylinder is extended to drive the driving rod 732 to move backward. When the driving rod 732 moves backward, multiple clamping arms 731 can be controlled to clamp the tail end of the cleaning gun 5, and the operation is simple and convenient.

[0059] Of course, in other embodiments, the driving member 736 can also be set as a hydraulic cylinder. Technical personnel in the relevant field can choose according to actual needs, and will not go into details here.

[0060] Reference Figure 8 , 9 Considering that if the driving member 736 is damaged and cannot provide thrust during operation, the spring 735 will pull the driving rod 732 forward, which will cause the clamping failure. Therefore, the present invention also designs a structure for mechanically locking the driving rod 732 at a fixed position;

[0061] Specifically, in the present invention, a groove is provided in the axial direction on the outer periphery of the driving rod 732, and a plurality of wedge-shaped teeth 75 are spaced apart inside the groove, and the inclined surface of the wedge-shaped teeth 75 faces the side where the driving rod 732 moves backward, so as to achieve a subsequent one-way locking effect;

[0062] The end surface of the mounting seat 71 is slidably connected with a limit plate 77 through a compression spring 76. In this embodiment, a slot is provided on the end surface of the limit plate 77, and a bolt located in the slot is fixedly installed on the end surface of the mounting seat 71, so as to guide the sliding of the limit plate 77. In addition, the two ends of the compression spring 76 in this embodiment are respectively fixed to the limit plate 77 and the end surface of the mounting seat 71;

[0063] Reference Fig. 9A through hole for accommodating the drive rod 732 is provided on the end face of the limit plate 77, and a card 78 fixedly installed in the through hole and locked between two adjacent wedge-shaped teeth 75, a magnet 79 is provided at the bottom of the limit plate 77, and an electromagnet 8 opposite to the magnet 79 is provided on the end face of the mounting seat 71. It should be noted that when the electromagnet 8 in the present invention is energized, the magnetism of the opposite surface of the electromagnet 8 and the magnet 79 is opposite, so that the entire limit plate 77 is pushed upward to unlock the drive rod 732.

[0064] When the cylinder is working, the electromagnet 8 does not work at this time, and the compression spring 76 pushes the limit plate 77 to move downward until the card 78 at the bottom of the limit plate 77 is engaged between the two wedge-shaped teeth 75 in the groove. Due to the structural characteristics of the wedge-shaped teeth 75, when the drive rod 732 moves, the wedge-shaped teeth 75 will push the card 78 upward to drive the limit plate 77 to move upward, that is, the limit plate 77 will not limit the drive rod 732 in the backward movement direction, but limit the drive rod 732 in the forward movement direction to achieve its position locking. Even when the cylinder is damaged, the limit plate 77 will mechanically lock the drive rod 732 to ensure the clamping stability of the cleaning gun 5 and avoid the problem of clamping failure.

[0065] Of course, when it is necessary to unlock the cleaning gun 5 normally, the electromagnet 8 works first. Since the magnetism of the electromagnet 8 is opposite to that of the magnet 79, it will push the entire limit plate 77 to move upward to separate the card 78 from the wedge-shaped tooth 75. After that, the cylinder can retract freely, driving the drive rod 732 to move forward, so that the clamping arm 731 rotates and separates from the cleaning gun 5, and the unlocking action is completed.

[0066] In a further embodiment, the guide sleeve 4 in the present invention has a hollow cavity, and a joint connected to the hollow cavity is installed on the outer side of the guide sleeve 4, that is, the guide sleeve 4 in the present invention adopts a hollow structure design. In actual use, a cooling medium such as circulating water or air can be connected through the joint to prevent the guide sleeve 4 from thermal deformation and maintain good rigidity to support the cleaning gun.

[0067] In addition, in the present invention, a tube sheet hole alignment method for cleaning SAR heat recovery device uses the above mechanism, and the specific method includes the following steps:

[0068] Reference Figure 2 , 100, open the tube cover of the tube plate hole 61 of the smoke box 6, and move the machine 1 so that the cleaning gun 5 and the guide sleeve 4 are facing the tube plate hole 61 in front;

[0069] Reference Figure 3 , 200, the cleaning gun 5 and the guide sleeve 4 move forward synchronously, and extend into the smoke box 6 from the guide tube of the tube plate hole 61;

[0070] Reference Figure 4 , 300, after the guide sleeve 4 reaches the position inside the smoke box 6, it stops moving forward, and the cleaning gun 5 continues to move forward to the heat exchanger pipe mouth;

[0071] 400. After the head of the cleaning gun 5 enters the heat exchanger tube, it stops moving forward temporarily. After the head of the cleaning gun 5 enters the heat exchanger tube, the guide sleeve 4 exits the smoke box 6. The guide sleeve 4 exits and stops outside the smoke box to avoid the influence of the internal high-temperature smoke on the guide sleeve 4, and effectively reduces the thermal deformation of the guide sleeve 4.

[0072] Reference Figure 5 , 6 , 500, the cleaning gun 5 continues to move forward, passing through the heat exchanger tube to clean the dust and dirt inside the tube;

[0073] 600. After the cleaning gun 5 has cleaned one heat exchanger tube, it exits the smoke box 6 and then moves to the position of the next tube sheet hole 61 to repeat the above sequence of actions.

[0074] In summary, the guide sleeve 4 and the cleaning gun 5 in the present invention adopt a clearance fit method. Due to the small clearance, the guide sleeve 4 can better restrain the cleaning gun 5. When the guide sleeve 4 is extended into the smoke box 6, the cleaning gun 5 extends out of the guide sleeve 4. At this time, the front end of the guide sleeve 4 becomes the supporting point of the cleaning gun 5. Compared with the supporting position of the guide tube on the original smoke box 6, the supporting point is actually moved forward a longer distance. Therefore, the cantilever distance of the cleaning gun 5 becomes shorter, so that the drooping and deformation of the protruding part of the front end of the cleaning gun 5 are greatly reduced. The deviation of the gun head of the cleaning gun 5 is smaller than the inner diameter of the heat exchange tube hole. In this way, the gun head of the cleaning gun 5 can be aligned with the heat exchanger tube hole. The length of the guide sleeve 4 can be determined according to the actual needs of the centering of the cleaning gun 5, as long as the centering of the cleaning gun 5 can be met.

[0075] The guide sleeve 4 in the present invention enters the smoke box 6 together with the cleaning gun 5 and supports and constrains the cleaning gun 5 to center the heat exchanger tube hole only when the cleaning gun 5 enters the smoke box. The guide sleeve 4 stays outside the smoke box 6 at other times, which greatly reduces the problem of deformation caused by high temperature. In addition, the overall mechanism is a movable functional component and does not belong to the smoke box 6. Therefore, the centering function of the cleaning gun 5 is achieved without any structural change to the smoke box 6.

[0076] Secondly, the guide sleeve 4 is small in size and does not occupy too much space inside the smoke box 6, so it will not affect the smoke circulation inside the smoke box 6 and has basically no effect on the heat exchange process parameters. At the same time, the guide sleeve 4 adopts a hollow structure design, and a circulating cooling medium can be passed into the interior to cool the tube, thereby preventing itself from thermal deformation and maintaining good rigidity to support the cleaning gun 5.

[0077] In summary, the tube sheet hole centering mechanism realizes the centering requirement of the tube sheet hole without making any structural changes to the heat energy recovery device. It has a simple and reliable structure and is a key functional component for realizing automatic dust cleaning of the SAR heat energy recovery device.

[0078] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A tube sheet hole centering mechanism for cleaning SAR heat recovery device, characterized in that: It comprises a machine platform (1), a first sliding mechanism (2) and a second sliding mechanism (3) sliding above the machine platform (1); A guide sleeve (4) is installed on the first sliding mechanism (2), a cleaning gun (5) is movably inserted inside the guide sleeve (4), and the free end of the guide sleeve (4) is inserted along the tube plate hole (61) of the smoke box (6) to form a distal support point for the rod of the cleaning gun (5); A fixing mechanism (7) for fixing the tail end of the cleaning gun (5) is also installed on the second sliding mechanism (3).

2. The tube sheet hole centering mechanism for cleaning SAR heat recovery device according to claim 1 is characterized by: The first sliding mechanism (2) comprises a sliding seat (21) slidably connected above the machine platform (1), and a power assembly (22) is arranged between the sliding seat (21) and the machine platform (1); A support seat (41) is fixedly mounted on the upper end of the slide seat (21), and the guide sleeve (4) is fixed on the inner side of the support seat (41).

3. The tube sheet hole centering mechanism for cleaning SAR heat recovery device according to claim 2 is characterized by: The power assembly (22) comprises a motor fixed on the slide seat (21), a gear is fixed on the shaft end of the motor, and a rack meshing with the gear is fixedly mounted on the top of the machine platform (1).

4. The tube sheet hole centering mechanism for cleaning SAR heat recovery device according to claim 1, characterized in that: The second sliding mechanism (3) is structured with the first sliding mechanism (2).

5. The tube sheet hole centering mechanism for cleaning SAR heat recovery device according to claim 1, characterized in that: The fixing mechanism (7) comprises a mounting seat (71) mounted on the second sliding mechanism (3) and a fixing plate (72) fixed to the side of the mounting seat (71); a clamping structure (73) and a plurality of supporting columns (74) are provided on the end surface of the fixing plate (72); a placement space for accommodating the cleaning gun (5) is formed between the plurality of supporting columns (74).

6. The tube sheet hole centering mechanism for cleaning SAR heat recovery device according to claim 5, characterized in that: The clamping structure (73) comprises a clamping arm (731) hinged to the side of the fixing plate (72), and a driving rod (732) is movably inserted in the middle of the fixing plate (72); The outer side of the driving rod (732) is pin-connected with a connecting rod (733), and the distal end of the connecting rod (733) is pin-connected with the clamping arm (731).

7. The tube sheet hole centering mechanism for cleaning SAR heat recovery device according to claim 6, characterized in that: An end seat (734) is fixedly mounted on the end of the driving rod (732), and the connecting rod (733) is pin-connected to the end seat (734); A spring (735) is fixedly connected between the end seat (734) and the fixed plate (72), and a driving member (736) for driving the driving rod (732) to move is fixed to the back end of the mounting seat (71).

8. The tube sheet hole centering mechanism for cleaning SAR heat recovery device according to claim 7, characterized in that: A groove is provided on the outer periphery of the driving rod (732) along the axial direction, and a plurality of wedge-shaped teeth (75) are distributed at intervals inside the groove; A limit plate (77) is slidably connected to the end surface of the mounting seat (71) via a compression spring (76); a through hole for accommodating the drive rod (732) is provided on the end surface of the limit plate (77); a card (78) fixedly mounted in the through hole and locked between two adjacent wedge-shaped teeth (75); a magnet (79) is provided at the bottom of the limit plate (77); and an electromagnet (8) opposite to the magnet (79) is provided on the end surface of the mounting seat (71).

9. A tube sheet hole centering mechanism for cleaning a SAR heat recovery device according to any one of claims 1 to 8, characterized in that: The guide sleeve (4) has a hollow cavity, and a joint connected to the hollow cavity is installed on the outer side of the guide sleeve (4).

10. A tube sheet hole centering method for cleaning a SAR heat recovery device, using a mechanism as described in any one of claims 1 to 9, characterized in that: Open the tube cover of the tube plate hole (61) of the smoke box (6), and move the machine platform (1) so that the cleaning gun (5) and the guide sleeve (4) are facing the tube plate hole (61) in front; The cleaning gun (5) and the guide sleeve (4) move forward synchronously and extend into the smoke box (6) through the guide tube of the tube plate hole (61); After the guide sleeve (4) reaches the position inside the smoke box (6), it stops moving forward, and the cleaning gun (5) continues to move forward until it is close to the heat exchanger pipe opening; The head of the cleaning gun (5) temporarily stops moving forward after entering the heat exchanger tube, and the guide sleeve (4) exits the smoke box (6) after the head of the cleaning gun (5) enters the heat exchanger tube; The cleaning gun (5) continues to move forward, passing through the heat exchanger tube to clean the dust and dirt inside the tube; After the cleaning gun (5) has cleaned one heat exchanger tube, it exits the smoke box (6) and then moves to the position of the next tube sheet hole (61) to repeat the above sequence of actions.

Images