Core pulling tool for kettle type heat exchanger

Abstract

The utility model relates to the field of heat exchanger tube bundle disassembly and assembly, in particular to a kettle type heat exchanger core pulling tool which comprises a supporting platform, a driving assembly and a main travelling crane, the driving assembly and the main travelling crane are located on the supporting platform and arranged in a matched mode, and the main travelling crane is provided with a hanging plate assembly and a traction mechanism. The traction mechanism comprises a winding assembly, a pull rope, a support and a fixed pulley, the winding assembly and the support are both installed on the main traveling crane, the end, away from the main traveling crane, of the support extends upwards, the fixed pulley is installed at the upper end of the support, one end of the pull rope is connected with the winding assembly, and the other end of the pull rope is wound around the fixed pulley to be used for being connected with a tube bundle tube plate. The traction mechanism and the hanging plate assembly which are arranged in a matched mode are adopted, when the core pulling action is conducted, the inhaul cable and the hooking part apply pulling force to the tube bundle tube plate at the same time for core pulling, operation is easy, the core pulling efficiency is improved, and the possibility that the tube bundle collides with a heat exchanger in the core pulling process can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of heat exchanger tube bundle disassembly and assembly, and in particular to a kettle-type heat exchanger core extraction tool. Background Art

[0002] The core component of the heat exchanger is the heat exchanger tube bundle. After a period of use, sediment and dirt will be generated in the tube bundle, affecting the heat transfer efficiency of the heat exchanger. Therefore, regular core extraction operations are required to clean and maintain the tube bundle.

[0003] In the related art, the core pulling operation is realized by a special tube bundle pulling and installing machine. The tube bundle pulling and installing machine generally includes a supporting platform, a main crane, an auxiliary crane, and a driving device. Initially, the tube bundle is located in the heat exchanger. First, a long cable is used to connect the main crane with a certain distance to the lug on the tube bundle tube sheet. The driving assembly drives the main crane away from the heat exchanger, so that the cable pulls the tube bundle for preliminary core pulling. After the sufficient length is pulled out, the cable is removed, and the main crane is moved close to the tube bundle tube sheet, and the clamping assembly is clamped with the tube bundle tube sheet. The main crane is driven away from the heat exchanger again to complete the core pulling action.

[0004] The problem with the related technology is that the connection position between the cable and the ear is located below the connection position between the cable and the main crane, that is, the end of the cable away from the tube sheet of the tube bundle is tilted downward. When the driving assembly pulls the main crane to move, the pulling force applied by the cable to the tube sheet of the tube bundle is inclined, which causes one end of the tube bundle to easily come into direct contact with the inner wall of the heat exchanger and rub against each other during the core pulling process, which can easily cause damage to the tube bundle and the heat exchanger.

[0005] In addition, after using the cable to pull out the tube bundle, the staff also needs to remove the cable first, then drive the main crane close to the tube bundle tube sheet, and connect the main crane to the tube bundle tube sheet through the clamping parts and continue to pull it out. This process is time-consuming and labor-intensive, affecting the efficiency of core pulling. Utility Model Content

[0006] In order to simplify the operation and improve the core pulling efficiency, the present application provides a kettle heat exchanger core pulling tool.

[0007] The present application provides a kettle type heat exchanger core extraction tool adopts the following technical solution:

[0008] A core pulling tool for a kettle type heat exchanger comprises a supporting platform, and a driving assembly and a main crane which are located on the supporting platform and are arranged in coordination therewith. The main crane is provided with a hanging plate assembly, and the main crane is also provided with a pulling mechanism. The pulling mechanism comprises a winding assembly, a cable, a bracket and a fixed pulley. The winding assembly and the bracket are both installed on the main crane, and one end of the bracket away from the main crane extends upward. The fixed pulley is installed on the upper end of the bracket. One end of the cable is connected to the winding assembly, and the other end passes around the fixed pulley for connecting to a tube bundle tube sheet.

[0009] By adopting the above technical solution, the hanging plate assembly, the pulling mechanism and the driving assembly are arranged in coordination, the driving assembly drives the main crane to move, the pulling mechanism and the hanging plate assembly connect the main crane with the tube sheet of the tube bundle, so that the tube bundle can be pulled for core pulling when the main crane moves. During the core pulling process, the pulling mechanism and the hanging plate assembly can limit the moving direction and position of the tube bundle, reduce the possibility of friction between the tube bundle and the heat exchanger, and improve the core pulling efficiency.

[0010] Optionally, a guide rail cooperating with the main trolley is provided on the support platform, and the drive assembly is arranged on one side of the guide rail. The drive assembly includes a chain belt and a sprocket. The sprocket is installed at both ends of the guide rail, and the chain belt passes around the sprocket and extends to the main trolley. The main trolley is provided with a mounting seat extending to the side of the guide rail, the chain belt is connected to the mounting seat, and the drive assembly also includes a motor connected to the sprocket.

[0011] By adopting the above technical solution, the guide rail can limit the moving direction of the main crane to further ensure the displacement direction of the tube bundle core pulling. The sprocket rotates under the drive of the motor, and the chain belt is actuated accordingly. The mounting seat connected to the chain belt drives the main crane to move with the chain belt, providing driving force for the main crane.

[0012] Optionally, the winding assembly includes a winding steel wheel installed on the main crane, and a rotary drive for driving the winding steel wheel to rotate, and an inwardly recessed annular groove is formed on the circumferential surface of the winding steel wheel, and the annular groove is used for winding the cable.

[0013] By adopting the above technical solution, the rotary drive can drive the winding steel wheel to rotate to wind or unwind the cable, thereby realizing flexible adjustment of the cable tension. The annular groove is used to limit the cable to prevent the cable from detaching from the winding steel wheel.

[0014] Optionally, the pulling mechanism further includes a limiting wheel arranged in cooperation with the fixed pulley, the limiting wheel is fixed to a side of the fixed pulley away from the heat exchanger, a through hole is formed between the fixed pulley and the limiting wheel, and the through hole is adapted to the pull cable.

[0015] By adopting the above technical solution, the limiting wheel is cooperatively arranged with the fixed pulley to limit and guide the cable passing therethrough, thereby preventing the cable from detaching from the fixed pulley and ensuring the stability of the cable displacement.

[0016] Optionally, it also includes an auxiliary crane, which is arranged between the main crane and the heat exchanger. The auxiliary crane has a crane platform that is slidably connected to the guide rail. The crane platform is formed with an installation cavity that passes through its upper surface. A jack is arranged in the installation cavity. The telescopic end of the jack extends vertically upward and is connected to a receiving plate. The receiving plate is arranged at the upper end opening of the installation cavity and is rotatably connected to the crane platform.

[0017] By adopting the above technical solution, the traveling platform, the jack and the receiving plate are arranged in coordination. During the core pulling process, the jack drives the receiving plate to abut against the outer surface of the tube bundle. Through the friction between the receiving plate and the tube bundle, the traveling platform is driven to move synchronously during the movement of the tube bundle, thereby providing auxiliary support for the tube bundle and avoiding deformation of the tube bundle due to uneven force.

[0018] Optionally, a clamping assembly is provided at one end of the support platform close to the heat exchanger, and the clamping assembly includes a telescopic drive and a clamping foot. The fixed end of the telescopic drive is installed on the support platform, and the telescopic drive also has a driving end extending horizontally toward the heat exchanger, and the clamping foot is rotatably connected to the driving end.

[0019] By adopting the above technical solution, when the telescopic driver drives the clamping foot to move, the clamping foot can be brought into contact with the outer edge of the heat exchanger, thereby applying a clamping force to the heat exchanger to achieve a clamping effect, which is used to keep the supporting platform and the heat exchanger relatively still during the core pulling process, thereby improving the stability of the core pulling process.

[0020] Optionally, the hanging plate assembly includes a lifting drive, a hanging plate and a hooking portion, the lifting drive is installed on the main trolley and has a driving end extending downward, the hanging plate is connected to the driving end, the hooking portion is integrally formed at one end of the hanging plate away from the main trolley, and the plane where the hooking portion is located is perpendicular to the hanging plate.

[0021] By adopting the above technical solution, when the lifting drive drives the hanging plate to move up and down, the hooking part can abut against the outer edge end surface of the tube bundle tube sheet. When the driving component drives the main crane to move away from the heat exchanger, the hanging plate moves with the main crane, and the hooking part simultaneously applies a pulling force to the tube bundle tube sheet to realize core pulling.

[0022] Optionally, rollers compatible with the guide rails are provided at the bottom of the traveling platform of the auxiliary traveling crane.

[0023] By adopting the above technical solution, the setting of the roller can reduce the friction between the auxiliary crane and the supporting platform, ensuring that the auxiliary crane can move synchronously with the tube bundle through friction during the core pulling process, so as to provide more stable support for the tube bundle.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. The present invention adopts a pulling mechanism and a hanging plate assembly that are arranged in coordination. When the core pulling action is performed, the driving assembly drives the main crane to move along the guide rail, the pulling cable of the pulling mechanism is connected to the tube sheet of the tube bundle, and the lifting driver drives the hanging plate to move upward so that the hooking part overlaps with the tube sheet of the tube bundle. When the main crane is away from the heat exchanger, the pulling cable and the hooking part simultaneously apply pulling force to the tube sheet of the tube bundle to pull the core. The operation is simple, the core pulling efficiency is improved, and the possibility of friction between the tube bundle and the heat exchanger during the core pulling process can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a side view structural schematic diagram of an embodiment of the present application.

[0027] Figure 2 yes Figure 1 A schematic diagram of the enlarged structure at point A in the middle.

[0028] Figure 3 It is a partial top view of the structure of an embodiment of the present application.

[0029] Figure 4 yes Figure 3 A magnified schematic diagram of the structure at point B in the middle.

[0030] Figure 5 The present invention is a front view cross-sectional structural schematic diagram of an embodiment of the present application.

[0031] Figure numerals: 1. Support platform; 2. Drive assembly; 21. Chain belt; 22. Sprocket; 3. Main crane; 31. Mounting seat; 4. Hanging plate assembly; 41. Lifting drive; 42. Hanging plate; 43. Hooking part; 5. Pulling mechanism; 51. Winding assembly; 511. Winding steel wheel; 512. Rotating drive; 52. Cable; 53. Bracket; 54. Fixed pulley; 55. Limiting wheel; 6. Guide rail; 7. Auxiliary crane; 71. Crane platform; 72. Jack; 73. Attachment plate; 74. Roller; 8. Clamping assembly; 81. Telescopic drive; 82. Clamping foot. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-5 This application is described in further detail.

[0033] The present application embodiment discloses a kettle heat exchanger core extraction tool, which is used to extract the tube bundle in the heat exchanger. Figure 1A core pulling tool for a kettle heat exchanger includes a support platform 1, which is composed of a plurality of overlapping steel beams to form a rectangular plane structure as a whole, and lifting ears are provided on both sides of the width direction of the support platform 1. Before the core pulling work, the support platform 1 needs to be connected to the lifting device through the lifting ears, and the lifting device is used to transfer it to one end of the heat exchanger, and the position of the support platform 1 is adjusted so that the axial direction of the heat exchanger is parallel to the length direction of the support platform 1, and the support platform 1 is located at a suitable position below the heat exchanger.

[0034] Reference Figure 1 A clamping assembly 8 is provided at one end of the support platform 1 close to the heat exchanger, which is used to connect the support platform 1 with the heat exchanger to ensure the stability of the support platform 1. Specifically, the clamping assembly 8 includes a telescopic driver 81 and a clamping foot 82. The telescopic driver 81 is installed on the support platform 1 and the number is preferably two. The two telescopic drivers 81 are symmetrically distributed on both sides about the center line of the heat exchanger. The telescopic driver 81 has a telescopic end extending horizontally toward the heat exchanger, and the clamping foot 82 is rotatably installed on the telescopic end.

[0035] After the support platform 1 is moved to a suitable position by the sling, the telescopic driver 81 can drive the clamping foot 82 to extend, so that the clamping foot 82 is close to the heat exchanger and finally extends to the side of the heat exchanger away from the support platform 1 (during this process, the clamping foot 82 does not come into direct contact with the heat exchanger). Then the staff rotates the clamping foot 82 so that the clamping foot 82 coincides with the outer edge of the heat exchanger. At this time, the telescopic driver 81 drives the clamping foot 82 to retract slowly. During this process, the staff monitors the distance between the clamping foot 82 and the outer edge of the heat exchanger. When the clamping foot 82 is in close contact with the end face of the outer edge of the heat exchanger, the telescopic driver 81 stops moving, so that the clamping foot 82 remains in this position, thereby connecting the support platform 1 with the heat exchanger. The telescopic driver 81 can be specifically a hydraulic cylinder or the like.

[0036] Those skilled in the art will appreciate that in addition to the telescopic drive 81 and the clamping foot 82, components such as steel cables may also be provided on the support platform 1. After the clamping foot 82 is tightly attached to the end surface of the outer edge of the heat exchanger to achieve clamping, the support platform 1 is connected and fixed to other parts of the heat exchanger through the steel cables to improve the connection effect between the two and ensure the stability of the support platform 1 during the core pulling process.

[0037] Reference Figure 1 , a driving assembly 2, a guide rail 6 and a main crane 3 are arranged on the supporting platform 1, and the guide rail 6 is laid on the supporting platform 1 and extends along the length direction of the supporting platform 1. The driving assembly 2 is arranged on one side of the guide rail 6, and has a driving end that can move along the extending direction of the guide rail 6. The main crane 3 is slidably matched on the guide rail 6 and connected to the driving end of the driving assembly 2. The driving assembly 2 can drive the main crane 3 to move along the guide rail 6 to provide driving force for the core pulling action.

[0038] The driving assembly 2 includes sprockets 22 installed at both ends of the guide rail 6, a chain belt 21 drivingly connected between the two sprockets 22, and a motor (not shown in the drawings) driving at least one of the sprockets 22 to rotate. The chain belt 21 is in a long strip shape, and both ends of the chain belt 21 passing through the sprocket 22 extend horizontally toward the main crane 3. Mounting seats 31 are formed at the positions of the main crane 3 corresponding to the two ends of the chain belt 21, and the two ends of the chain belt 21 are fixed to the mounting seats 31 by fasteners. When the motor drives the sprocket 22 to rotate, the chain belt 21 is transmitted between the two sprockets 22, thereby driving the main crane 3 connected thereto to move.

[0039] Reference Figure 1 , Figure 3 and Figure 4 A pulling mechanism 5 is provided on the main crane 3, and the pulling mechanism 5 is used to connect the main crane 3 with the tube bundle in the heat exchanger. When the driving assembly 2 drives the main crane 3 to move along the guide rail 6 away from the heat exchanger, the pulling mechanism 5 can apply a pulling force to the tube bundle to pull the tube bundle out of the heat exchanger.

[0040] Furthermore, the pulling mechanism 5 includes a winding assembly 51, a cable 52, a bracket 53 and a fixed pulley 54. The winding assembly 51 is mounted on the main crane 3 and one end of the cable 52 is wound around the winding assembly 51. One end of the bracket 53 is fixed to the upper surface of the main crane 3, and the other end extends upward and is connected to the fixed pulley 54. One end of the cable 52 extending from the winding assembly 51 bypasses the fixed pulley 54 and extends toward the direction close to the heat exchanger. It can be understood that, generally speaking, a lug is formed on the tube sheet of the tube bundle, and the cable 52 drawn from the fixed pulley 54 is connected to the tube sheet of the tube bundle through the lug. Preferably, the height of the fixed pulley 54 is specially limited so that the portion of the cable 52 drawn from the fixed pulley 54 is in the same horizontal plane as the lug.

[0041] With the above structure, when the support platform 1 is connected and fixed to the heat exchanger, the main crane 3 maintains a certain distance from the heat exchanger, and the staff unwinds the cable 52 to a certain length according to the distance, so that the end of the cable 52 extending toward the heat exchanger can be connected to the lug. Then the winding assembly 51 winds the cable 52 again to tighten it, and the driving assembly 2 is started to move the main crane 3 away from the heat exchanger. At this time, the cable 52 applies a pulling force to the tube bundle in the direction away from the heat exchanger through the lug, and the tube bundle is slowly pulled out from the heat exchanger.

[0042] In order to improve the stability of the cable 52 during the process of pulling the tube bundle tube sheet, the portion of the cable 52 that bypasses the fixed pulley 54 is limited. The pulling mechanism 5 also includes a limiting wheel 55 that is arranged in cooperation with the fixed pulley 54. The limiting wheel 55 is fixed to the side of the fixed pulley 54 away from the heat exchanger. A through hole is formed between the fixed pulley 54 and the limiting wheel 55. The portion of the cable 52 that bypasses the fixed pulley 54 passes through the through hole to limit the cable 52.

[0043] Reference Figure 1 and Figure 2 A hanging plate assembly 4 is also provided on the main crane 3. The hanging plate assembly 4 is used to further connect the tube bundle to the main crane 3 and continue the core pulling action after the tube bundle is pulled out of a certain length.

[0044] The hanging plate assembly 4 is arranged on the side of the main crane 3 close to the heat exchanger, and includes a lifting drive 41, a hanging plate 42 and a hooking portion 43, wherein the lifting drive 41 is installed on the main crane 3, and the lifting drive 41 has a driving end extending vertically downward, and the hanging plate 42 is fixedly installed on the driving end, and one end of the hanging plate 42 away from the main crane 3 extends horizontally toward the heat exchanger and is fixedly connected with the hooking portion 43. The plane where the hooking portion 43 is located is perpendicular to the hanging plate 42, so that the two can form a roughly L-shaped structure.

[0045] When the support platform 1 is connected and fixed to the heat exchanger and the two remain relatively still, the plane where the hanging plate 42 and the hooking part 43 are located as a whole is located at a certain position below the tube sheet of the tube bundle. As the main crane 3 approaches the tube sheet of the tube bundle, the end of the hanging plate 42 provided with the hooking part 43 moves to the side of the tube sheet of the tube bundle away from the main crane 3, and the lifting driver 41 drives the hanging plate 42 to move upward, so that the hooking part 43 overlaps with the tube sheet of the tube bundle. At this time, the staff inserts the pad according to the distance between the hooking part 43 and the tube sheet of the tube bundle, so that the tube sheet of the tube bundle, the pad and the hooking part 43 are fully abutted, and then the driving assembly 2 is started to move the main crane 3 away from the heat exchanger. At this time, the hooking part 43 can exert external force on the tube sheet of the tube bundle to perform the core pulling action.

[0046] When the traction mechanism and the hanging plate assembly 4 are arranged in coordination, the core pulling step is specifically as follows: after the support platform 1 is fixed, the staff first connects the cable 52 to the lug, and at this time the main crane 3 is kept at a certain distance from the heat exchanger. The driving assembly 2 is started to move the main crane 3 away from the heat exchanger, and the cable 52 applies tension to the tube sheet of the tube bundle to perform preliminary core pulling. After the tube bundle is pulled out of the heat exchanger for a certain length, the driving assembly 2 controls the main crane 3 to approach the tube bundle. During this process, the winding assembly 51 winds up the excess cable 52 to ensure that the cable 52 is always kept in a taut state.

[0047] As the main crane 3 continues to approach the tube bundle, one end of the hanging plate 42 provided with the hooking portion 43 extends to the side of the tube bundle tube sheet away from the main crane 3, and the lifting driver 41 drives the hanging plate 42 to move upward, so that the hooking portion 43 overlaps with the tube bundle tube sheet, and the staff inserts a gasket between the hooking portion 43 and the tube bundle tube sheet, and then the driving assembly 2 controls the main crane 3 to move away from the heat exchanger again, and the hooking portion 43 and the cable 52 simultaneously apply tension to the tube bundle tube sheet to complete the core pulling action.

[0048] The winding assembly 51 is composed of a winding steel wheel 511 and a rotary driver 512. An inwardly concave annular groove is formed on the circumference of the winding steel wheel 511, and the cable 52 is wound in the groove. When the rotary driver 512 drives the winding steel wheel 511 to rotate in different directions, the cable 52 is wound or unwound.

[0049] Reference Figure 1 and Figure 5 , an auxiliary crane 7 is also arranged on the guide rail 6. The auxiliary crane 7 is used to provide auxiliary support to the part of the tube bundle during the tube bundle process to improve the stability of the tube bundle during the core pulling process. The auxiliary crane 7 includes a crane platform 71, a jack 72 and a receiving plate 73. The crane platform 71 is slidably installed on the guide rail 6. An installation cavity is formed in the crane platform 71. The jack 72 is fixed in the installation cavity. The push end of the jack 72 extends vertically upward, and the receiving plate 73 is rotatably connected to the push end. During the core pulling process, a gap is reserved between the receiving plate 73 and the tube bundle. After the tube bundle is pulled out to a certain length, the staff operates the jack 72 to push upward, so that one end of the receiving plate 73 moves upward and is tangent to the outer surface of the tube bundle as a whole, so that the receiving plate 73 is fully fitted with the tube bundle. When the core pulling continues, the friction between the tube bundle and the receiving plate 73 drives the crane platform 71 to move synchronously along the guide rail 6 to provide auxiliary support for the tube bundle.

[0050] Furthermore, rollers 74 are installed on the mating surfaces of the crane 71 and the guide rail 6. The setting of the rollers 74 can reduce the friction between the crane 71 and the guide rail 6, so that the tube bundle can more smoothly drive the auxiliary crane 7 to move synchronously during the core pulling process, providing more stable support for the tube bundle.

[0051] The implementation principle of a kettle type heat exchanger core extraction tool in the embodiment of the present application is:

[0052] Initially, the support platform 1 is moved to the heat exchanger, adjusted to a suitable position and kept balanced, and the telescopic drive 81 is controlled to extend so that the clamping foot 82 moves to the side of the heat exchanger away from the support platform 1. The staff rotates the clamping foot 82 so that it overlaps with the outer edge of the heat exchanger, and then controls the telescopic drive 81 to retract so that the clamping foot 82 fully contacts the end face of the outer edge of the heat exchanger, so as to clamp and fix the support platform 1 and the heat exchanger so that the two remain relatively still.

[0053] Then, the main crane 3 is kept at a certain distance from the heat exchanger. First, the rotary driver 512 is started to drive the winding steel wheel 511 to rotate, so that the cable 52 is unwound. The staff passes the cable 52 between the fixed pulley 54 and the limiting wheel 55 and connects it to the ears on both sides of the tube sheet of the tube bundle. The rotary driver 512 drives the winding steel wheel 511 to rotate to reel in the excess cable 52, so that the cable 52 is tightened.

[0054] Then, the driving assembly 2 drives the main crane 3 to move away from the heat exchanger, and applies tension to the tube sheet of the tube bundle through the cable 52 to initially pull out the tube bundle. After a certain length is pulled out, the driving assembly 2 drives the main crane 3 to move toward the heat exchanger, and at the same time, the rotary driver 512 drives the winding steel wheel 511 to rotate to reel the cable 52 until the main crane 3 moves to a suitable position close to the tube sheet of the tube bundle.

[0055] Then, the lifting driver 41 drives the hanging plate 42 to move upward, so that the hooking part 43 coincides with the outer edge of the tube sheet of the tube bundle, and a pad is inserted into the gap between the tube sheet of the tube bundle and the hooking part 43. During this process, the cable 52 is always kept in a tensioned state, and the driving assembly 2 drives the main crane 3 away from the heat exchanger. The hooking part 43 and the cable 52 simultaneously apply tension to the bottom and middle of the tube sheet of the tube bundle to perform a secondary core pulling action.

[0056] After the tube bundle is pulled out to a certain length, the main crane 3 stops moving, and the staff controls the jack 72 to extend, so that the receiving plate 73 is fully in contact with the tube bundle, and then the main crane 3 continues to move to pull the core. At this time, the friction between the tube bundle and the receiving plate 73 drives the auxiliary crane 7 to move synchronously, and the auxiliary crane 7 provides auxiliary support for the tube bundle during the core pulling process. After the core pulling is completed, the cable 52 is removed from the lug, and the lifting drive 41 drives the hanging plate 42 to descend, so that the hooking part 43 is offset from the tube sheet of the tube bundle, and the core pulling action is ended.

[0057] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A kettle heat exchanger core extraction tool, comprising a support platform (1), and a drive assembly (2) and a main crane (3) located on the support platform (1) and arranged in coordination therewith, wherein a hanging plate assembly (4) is arranged on the main crane (3), characterized in that: The main crane (3) is also provided with a pulling mechanism (5), the pulling mechanism (5) comprising a winding assembly (51), a cable (52), a bracket (53) and a fixed pulley (54), the winding assembly (51) and the bracket (53) are both mounted on the main crane (3), one end of the bracket (53) away from the main crane (3) extends upward, the fixed pulley (54) is mounted on the upper end of the bracket (53), one end of the cable (52) is connected to the winding assembly (51), and the other end of the cable (52) is passed around the fixed pulley (54) for connection to the tube bundle tube sheet.

2. The core extraction tool for a kettle type heat exchanger according to claim 1, characterized in that: The support platform (1) is provided with a guide rail (6) matched with the main trolley (3); the drive assembly (2) is arranged on one side of the guide rail (6); the drive assembly (2) comprises a chain belt (21) and a sprocket (22); the sprocket (22) is mounted on both ends of the guide rail (6); the chain belt (21) passes around the sprocket (22) and extends toward the main trolley (3); the main trolley (3) is provided with a mounting seat (31) extending toward the side of the guide rail (6); the chain belt (21) is connected to the mounting seat (31); and the drive assembly (2) further comprises a motor connected to the sprocket (22).

3. The core extraction tool for a kettle type heat exchanger according to claim 1, characterized in that: The winding assembly (51) comprises a winding steel wheel (511) mounted on the main crane (3), and a rotary driver (512) for driving the winding steel wheel (511) to rotate. An inwardly recessed annular groove is formed on the circumference of the winding steel wheel (511), and the annular groove is used for winding the cable (52).

4. The core extraction tool for a kettle type heat exchanger according to claim 1, characterized in that: The pulling mechanism (5) further comprises a limiting wheel (55) arranged in cooperation with the fixed pulley (54); the limiting wheel (55) is fixed to a side of the fixed pulley (54) away from the heat exchanger; a through hole is formed between the fixed pulley (54) and the limiting wheel (55); the through hole is adapted to fit the cable (52).

5. The core extraction tool for a kettle type heat exchanger according to claim 1, characterized in that: It also includes an auxiliary crane (7), the auxiliary crane (7) being arranged between the main crane (3) and the heat exchanger, the auxiliary crane (7) having a crane platform (71) slidably connected to the guide rail (6), the crane platform (71) having an installation cavity penetrating the upper surface thereof, the installation cavity being provided with a jack (72), the telescopic end of the jack (72) extending vertically upward and being connected to a receiving plate (73), the receiving plate (73) being arranged at the upper end opening of the installation cavity and being rotatably connected to the crane platform (71).

6. The core extraction tool for a kettle type heat exchanger according to claim 1, characterized in that: A clamping assembly (8) is provided at one end of the support platform (1) close to the heat exchanger, the clamping assembly (8) comprising a telescopic drive (81) and a clamping foot (82), the fixed end of the telescopic drive (81) being mounted on the support platform (1), the telescopic drive (81) also having a driving end extending horizontally toward the heat exchanger, the clamping foot (82) being rotatably connected to the driving end.

7. The core extraction tool for a kettle type heat exchanger according to claim 1, characterized in that: The hanging plate assembly (4) comprises a lifting drive (41), a hanging plate (42) and a hooking portion (43); the lifting drive (41) is mounted on the main trolley (3) and has a driving end extending downward; the hanging plate (42) is connected to the driving end; the hooking portion (43) is integrally formed at one end of the hanging plate (42) away from the main trolley (3); and the plane where the hooking portion (43) is located is perpendicular to the hanging plate (42).

8. The core extraction tool for a kettle type heat exchanger according to claim 5, characterized in that: The bottom of the traveling platform (71) of the auxiliary traveling crane (7) is provided with a roller (74) adapted to the guide rail (6).

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