Tube sheet turning tool

Abstract

The present invention discloses a tube sheet turning tool, comprising a clamp, a clamp locking device, and a circumferential limit device. The clamp comprises two clamps, which fit opposite sides of a workpiece and are provided with lifting lugs. The clamp locking device is used to lock the two clamps. The circumferential limit device is installed on the clamp and is used to limit the circumference of the workpiece. The clamp is provided with at least three circumferential limit devices. In the tube sheet turning tool provided in the present application, the lifting lugs are provided on the clamp, the circumferential limit device is used to limit the circumference of the workpiece, and the clamp locking device is used to lock the two clamps, thereby locking the workpiece. There is no need to provide fixings on the workpiece to avoid damage to the workpiece later. Therefore, the tube sheet turning tool provided in the present application reduces damage to the workpiece caused by the turning tool. At the same time, the tube sheet turning time is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of tools and fixtures, in particular to a tube plate turning fixture. Background Art

[0002] High-temperature gas-cooled reactors can provide a single-loop nuclear heat medium with a temperature of up to 750°C. In addition to power generation, they are also widely used in process fields, including petroleum refining, ethylene and methanol production, heavy oil thermal recovery, synthetic ammonia and fertilizer production, coal gasification, metal smelting, etc.

[0003] The deep hole processing technology for the steam generator tube sheet of the high-temperature gas-cooled reactor demonstration project is a key technology and one of the manufacturing difficulties in the manufacture of this equipment. When the quality of deep hole processing cannot be effectively guaranteed, it will affect the safety and heat exchange performance of the steam generator. The deep hole processing of the tube sheet is difficult and the processing work is difficult, and it has become a key process in the manufacturing process of the steam generator. After the deep hole processing of the tube sheet, in order to detect the secondary side hole bridge of the tube sheet hole, the position of the secondary side tube sheet hole, etc., the tube sheet needs to be turned over. The traditional process is to weld temporary lifting lugs and other accessories on the outer circle of the tube sheet. If temporary accessories are welded, according to the requirements of the ASME NB standard, an isolation layer with a material similar to the tube sheet needs to be welded on the outer circle of the tube sheet in advance to prevent the welding of temporary lifting lugs and other accessories from affecting the tube sheet base material.

[0004] Therefore, how to reduce the damage to the workpiece caused by the turning tool is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] The purpose of the present invention is to provide a tube sheet turning tool to reduce the damage to the workpiece caused by the turning tool.

[0006] To achieve the above-mentioned purpose, the present invention provides a tube sheet turning tool, comprising:

[0007] A clamp, comprising two clamps, the two clamps being attached to opposite sides of a workpiece, and the clamps being provided with lifting ears;

[0008] A clamp locking device for locking the two clamps;

[0009] and a circumferential limiting device installed on the fixture and used to limit the circumference of the workpiece. The fixture is provided with at least three of the circumferential limiting devices.

[0010] Preferably, the circumferential limiting devices are evenly distributed along the circumference of the workpiece; along the first direction, the circumferential limiting devices on the two clamps correspond one to one, and the first direction is the overlapping direction of the two clamps.

[0011] Preferably, the circumferential limiting device includes a horizontal locking device, and the horizontal locking device includes:

[0012] An orifice plate, wherein the orifice plate is provided with a plurality of limiting spaces along the second direction, wherein the second direction is a direction in which the orifice plate approaches or moves away from the center of the fixture;

[0013] A sliding seat that slides in cooperation with the orifice plate and can slide along the second direction, and the side wall of the sliding seat is used to abut against the side wall of the workpiece; the sliding seat includes a locking position that can be engaged with the limit space and a sliding position that can be withdrawn from the limit space, when the sliding seat is in the locking position, the orifice plate and the sliding seat are relatively fixed; when the sliding seat is in the sliding position, the sliding seat can slide along the second direction.

[0014] Preferably, the sliding seat includes a mounting seat, a clamping slider, a pressure rod and one end connected to the clamping slider, the other end connected to the pressure rod, and an elastic limit piece for pressing the limit end of the clamping slider to the limit space, the pressure rod is fixedly connected to the mounting seat, the mounting seat is slidably mounted on the orifice plate, and the mounting seat is provided with a slide groove for accommodating the clamping slider, the clamping slider can slide along the slide groove to allow the limit end to slide into and out of the limit space, and the limit space is provided with a first guide inclined surface on the side close to the center of the clamp, the limit end is provided with a second guide inclined surface that can fit with the first guide inclined surface, and the limit end is provided with a limit step that can abut against the limit space on the side away from the center of the clamp.

[0015] Preferably, it further comprises a level adjustment device for driving the circumferential limiting device to slide along the second direction.

[0016] Preferably, the clamp is provided with a top shaft, the horizontal adjustment device includes a first screw and a rotating protrusion, the clamp is provided with a first through hole for the threaded portion of the first screw to pass through, the threaded portion is threadedly connected to the orifice plate to drive the orifice plate to slide along the second direction, the rotating protrusion is fixedly connected to the first screw, the top shaft is sleeved on the outside of the rotating protrusion, and is gap-matched with the rotating protrusion, and the rotating protrusion is limited at both ends of the top shaft along the second direction to limit the first screw from sliding along the second direction.

[0017] Preferably, the fixture is provided with an orifice plate slot for accommodating the orifice plate, the orifice plate slot extends along the second direction, the orifice plate can slide along the orifice plate slot, the orifice plate is limited in the orifice plate slot by a pressure plate, and the pressure plate is fixedly connected to the fixture.

[0018] Preferably, the clamp locking device includes a second screw and a vertical locking device, the vertical locking device includes a locking sleeve, a fine-tuning nut threadedly connected to the second screw, and a locking assembly for locking the locking sleeve and the second screw, the fine-tuning nut is threadedly connected to the second screw, the limit piece at one end of the second screw away from the vertical locking device abuts against one of the outer side surfaces of the clamp, the side of the fine-tuning nut close to the limit piece abuts against the other outer side surface of the clamp, the locking sleeve is sleeved on the outside of the screw end of the second screw, and the clamp is provided with an opening for the second screw to pass through.

[0019] Preferably, the interior of the locking sleeve is a hollow stepped hole structure, the fine-tuning nut is located inside the locking sleeve close to the locking assembly, and one of the locking sleeve and the second screw is provided with a locking groove, and the other is provided with a locking rail arranged in the locking groove.

[0020] Preferably, the locking assembly includes a locking rod, a first limiting hole provided on the locking sleeve and a second limiting hole provided on the second screw, a plurality of the second limiting holes are provided along the first direction, the first limiting hole includes an internal limiting hole that can be connected to the outside of the second limiting hole, an external limiting hole away from the second limiting hole, and a middle through hole connecting the internal limiting hole and the external limiting hole, so that the locking rod slides from the external limiting hole into the internal limiting hole and the second limiting hole; the locking rod is a dumbbell-shaped rod, and the two ends of the locking rod are The ends protrude from the two ends of the second limiting hole, and the middle connecting piece of the locking rod is a flat strip structure; along the first direction, the first size of the second limiting hole, the internal limiting hole and the external limiting hole is larger than the second size of the middle through hole; the width of the middle connecting piece along the cross section perpendicular to the sliding direction of the locking rod is smaller than the second size; the length of the middle connecting piece is larger than the second size and smaller than the first size, so that the middle connecting piece can slide in the middle through hole and rotate in the second limiting hole, the internal limiting hole and the external limiting hole.

[0021] Preferably, each clamp is provided with two or at least three lifting ears, and the lifting ears on the same clamp are evenly distributed in the circumferential direction with the center of the clamp as the center.

[0022] In the above technical solution, the tube sheet turning tool provided by the present invention includes a clamp, a clamp locking device and a circumferential limit device. The clamp includes two clamps, and the two clamps are attached to the opposite sides of the workpiece. The clamps are provided with lifting ears; the clamp locking device is used to lock the two clamps; the circumferential limit device is installed on the clamp and is used to limit the circumference of the workpiece. The clamp is provided with at least three circumferential limit devices.

[0023] From the above description, it can be seen that in the tube sheet turning tool provided in the present application, the lifting ear is set on the clamp, the circumferential limit device is used to limit the workpiece circumferentially, and the two clamps are locked by the clamp locking device, thereby locking the workpiece. There is no need to set fixing parts on the workpiece to damage the workpiece later. Therefore, the tube sheet turning tool provided in the present application reduces the damage to the workpiece caused by the turning tool and shortens the turning time of the tube sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0025] Figure 1 A three-dimensional structural diagram of the tube sheet turning tool provided in an embodiment of the present invention after clamping a workpiece;

[0026] Figure 2 A front view of the tube sheet turning tool provided in an embodiment of the present invention after clamping a workpiece;

[0027] Figure 3 for Figure 2 The schematic diagram of the structure of the tube sheet turning tool along the AA direction is shown;

[0028] Figure 4 A top view of the tube sheet turning tool provided in an embodiment of the present invention after clamping a workpiece;

[0029] Figure 5 A front view of a vertical locking device provided by an embodiment of the present invention;

[0030] Figure 6 for Figure 5 The schematic diagram of the structure of the vertical locking device along the BB direction is shown;

[0031] Figure 7 A three-dimensional structural diagram of a vertical locking device provided by an embodiment of the present invention;

[0032] Figure 8 A three-dimensional structural diagram of a horizontal limit assembly provided in an embodiment of the present invention;

[0033] Figure 9 A front view of a horizontal limit assembly provided by an embodiment of the present invention;

[0034] Figure 10 A top view of a horizontal limit assembly provided by an embodiment of the present invention;

[0035] Figure 11A diagram showing the installation position of the horizontal limit assembly on the fixture provided in an embodiment of the present invention;

[0036] Figure 12 for Figure 11 A partial enlarged view of the L portion shown;

[0037] Figure 13 The horizontal limit assembly provided for the embodiment of the present invention does not involve the installation position diagram of the pressure plate;

[0038] Figure 14 A diagram showing the installation position of the horizontal limit assembly provided by an embodiment of the present invention after the pressure plate is installed;

[0039] Figure 15 A cross-sectional view of the installation position of the horizontal limit assembly provided by an embodiment of the present invention after the pressure plate is installed;

[0040] Figure 16 A three-dimensional structural diagram of the first screw provided in an embodiment of the present invention;

[0041] Figure 17 A schematic structural diagram of a top shaft provided in an embodiment of the present invention;

[0042] Figure 18 A schematic structural diagram of a locking sleeve provided in an embodiment of the present invention;

[0043] Figure 19 for Figure 18 The structural diagram of the locking sleeve along the CC direction is shown;

[0044] Figure 20 A three-dimensional structural diagram of a locking sleeve provided in an embodiment of the present invention;

[0045] Figure 21 A schematic structural diagram of a locking rod provided in an embodiment of the present invention;

[0046] Figure 22 for Figure 21 The structural diagram of the locking rod along the DD direction is shown;

[0047] Figure 23 A schematic structural diagram of a second screw provided in an embodiment of the present invention;

[0048] Figure 24 for Figure 2 a side view of the second screw shown;

[0049] Figure 25 A schematic structural diagram of a orifice plate provided in an embodiment of the present invention;

[0050] Figure 26 for Figure 25 The structural diagram of the orifice plate along the EE direction is shown;

[0051] Figure 27 A schematic structural diagram of a clamping slider provided in an embodiment of the present invention;

[0052] Figure 28 for Figure 27 The shown is a partial enlarged view of the M portion of the clamping slider;

[0053] Figure 29 A top view of a clamping slider provided in an embodiment of the present invention;

[0054] Figure 30 A side view of a clamping slider provided by an embodiment of the present invention;

[0055] Figure 31 A three-dimensional structural diagram of a clamping slider provided in an embodiment of the present invention;

[0056] Figure 32 A three-dimensional structural diagram of a sliding seat provided in an embodiment of the present invention;

[0057] Figure 33 A schematic structural diagram of a sliding upper plate provided in an embodiment of the present invention;

[0058] Figure 34 A top view of a sliding upper plate provided in an embodiment of the present invention;

[0059] Figure 35 A side view provided for an embodiment of the present invention;

[0060] Figure 36 A schematic structural diagram of a sliding base provided in an embodiment of the present invention;

[0061] Figure 37 A top view of a sliding base provided by an embodiment of the present invention;

[0062] Figure 38 A schematic structural diagram of a compression rod provided in an embodiment of the present invention;

[0063] Figure 39 A top view of a compression rod provided in an embodiment of the present invention.

[0064] in Figure 1-39 middle:

[0065] 1. Fixture; 11. Opening; 12. Orifice plate slide; 121. Width; 122. Total length; 123. Depth; 124. Mounting slot dimensions; 125. Outside dimensions; 13. First through hole; 14. First threaded hole; 15. Second threaded hole; 16. First pressure plate; 17. Second pressure plate; 18. Screw; 19. Spindle; 191. Spindle groove; 192. Opening diameter;

[0066] 2. Lifting eye; 21. First lifting eye; 22. Second lifting eye; 23. Third lifting eye;

[0067] 3. Level adjustment device; 31. Rotating protrusion; 32. First screw; 33. Thread length;

[0068] 4. Horizontal locking device; 41. Orifice plate; 411. First guide slope; 412. Threaded hole; 413. Limiting space; 42. Sliding bottom plate; 421. Groove; 43. Sliding upper plate; 431. Slide groove; 432. Through hole; 433. Threaded hole; 44. Clamping slider; 441. Second guide slope; 442. Length; 443. Width; 444. Length; 445. Top width; 446. Limiting step; 447. Blind hole; 448. Arc; 449. Limiting end; 45. Elastic limiting member; 46. Pressure rod; 461. Outer diameter; 462. Length; 463; 464; 47. Bolt; 48. Spring pressure rod screw;

[0069] 5. Second screw; 51. Locking chute; 52. Second limiting hole; 53. Limiting member;

[0070] 6. Vertical locking device; 61. Locking sleeve; 611. Inner diameter dimension; 612. Locking slide rail; 613. Internal thread; 614. First limiting hole; 62. Locking rod; 621. Length dimension; 622. Width dimension; 623. Length of middle connecting piece; 624. Middle connecting piece; 625; 63. Fine-tuning nut. DETAILED DESCRIPTION

[0071] The core of the present invention is to provide a tube sheet turning tool to reduce the damage to the workpiece caused by the turning tool.

[0072] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and implementation methods.

[0073] Please refer to Figures 1 to 39 .

[0074] In a specific embodiment, the tube sheet turning tool provided by the specific embodiment of the present invention includes a clamp 1, a clamp locking device and a circumferential limit device. The clamp 1 includes two clamps 1, and the two clamps 1 are attached to the opposite sides of the workpiece. The clamp 1 is mainly welded by steel plates, I-beams or square steels, and needs to have sufficient rigidity to prevent it from being deformed by force during the lifting process, causing the tube sheet to slip. Specifically, the clamp 1 is designed as follows Figure 11 The most stable triangular shape shown can save raw materials and reduce its own weight while meeting the requirements of tube sheet turning and clamping. It can also be designed into other shapes.

[0075] During processing, after the fixture 1 is welded, it is subjected to overall heat treatment to eliminate stress and avoid deformation due to stress release. Then, the holes and grooves on the fixture 1 are processed to ensure processing accuracy.

[0076] The clamp is provided with a lifting lug 2, which is used to install a shackle for lifting and turning. Each clamp 1 is provided with two or at least three lifting lugs 2, and the lifting lugs 2 on the same clamp 1 are evenly distributed circumferentially with the clamp center as the center.

[0077] The three lifting lugs 2 are the first lifting lug 21, the second lifting lug 22 and the third lifting lug 23, and are arranged as follows: Figure 1 As shown, when lifting and turning over, the slings hung by the first lifting eye 21 and the second lifting eye 22 are hung on the same hook, and the third lifting eye 23 is hung on another hook, ensuring that the angle between the lifting eye and the shackle is small, the shackle is evenly stressed, and the risk of deformation and breakage of the shackle is reduced.

[0078] The fixture locking device is used to lock the two fixtures; the circumferential limit device is installed on the fixture and is used to limit the circumference of the workpiece. At least three circumferential limit devices are provided on the fixture.

[0079] When in use, a clamp 1 is placed above and below the tube sheet to clamp the tube sheet.

[0080] From the above description, it can be seen that in the tube sheet turning tool provided in the specific embodiment of the present application, the lifting ear is set on the clamp, the circumferential limit device is used to limit the workpiece circumferentially, and the two clamps are locked by the clamp locking device, and then the clamp is locked to the workpiece. There is no need to set fixing parts on the workpiece to damage the workpiece later. Therefore, the tube sheet turning tool provided in the present application reduces the damage to the workpiece caused by the turning tool.

[0081] In order to improve the force stability, it is preferred that the circumferential limit devices are evenly distributed along the circumference of the workpiece; along the first direction, the circumferential limit devices on the two clamps 1 correspond one to one, and the first direction is the overlapping direction of the two clamps 1.

[0082] In a specific embodiment, it also includes a horizontal locking device 4, which is installed on the clamp 1 (such as Figure 11 As shown), 3 are evenly distributed, and the horizontal locking device 4 can achieve rapid sliding and locking in the horizontal direction, holding the tube sheet to prevent it from moving during the turning process. At the same time, it is easy to disassemble and saves the time required for rotating the nuts of the traditional turning tool.

[0083] The horizontal locking device 4 can be a linear ratchet structure. Specifically, the horizontal locking device 4 includes a hole plate 41 and a sliding seat. The hole plate 41 is provided with a plurality of limit spaces along the second direction. The second direction is the direction of the hole plate 41 approaching or moving away from the center of the fixture 1; the sliding seat is slidably matched with the hole plate 41 and can slide along the second direction. The side wall of the sliding seat is used to abut against the side wall of the workpiece; the sliding seat includes a locking position that can be engaged with the limit space and a sliding position that is pulled out of the limit space. When the sliding seat is in the locking position, the hole plate 41 is relatively fixed to the sliding seat; when the sliding seat is in the sliding position, the sliding seat can slide along the second direction.

[0084] In a specific embodiment, the sliding seat includes a mounting seat, a clamping slider 44, a pressure rod 46 and an elastic limit member 45, one end of which is connected to the clamping slider 44 and the other end is connected to the pressure rod 46, and is used to press the limit end of the clamping slider 44 to the limit space. The pressure rod 46 is fixedly connected to the mounting seat, and the mounting seat is slidably mounted on the orifice plate 41. The mounting seat is provided with a slide groove 431 for accommodating the clamping slider 44. The clamping slider 44 can slide along the slide groove 431 to make the limit end slide in and out of the limit space. The limit space is close to the center of the clamp 1 on the side with a first guide slope 411, and the limit end is provided with a second guide slope 441 that can be fitted with the first guide slope. The limit end is provided with a limit step that can abut against the limit space on the side away from the center of the clamp 1.

[0085] Specifically, the elastic limiting member 45 may be a spring.

[0086] The pressure rod 26 is mounted on the mounting base by screws 48. The pressure plate 41 is in the orifice plate slot 12 of the fixture 1 (as shown in FIG. Figure 12 As shown), the depth and width of the orifice plate slide groove 12 of the fixture 1 can accommodate the sliding component of the horizontal locking structure 4 to slide freely without obstruction.

[0087] Specifically, the mounting seat includes a sliding upper plate 43 and a sliding bottom plate 42 connected to the sliding upper plate 43 by bolts 47. A clamping slider 44 is provided in the sliding upper plate 43, and one end of the clamping slider 44 away from the pressure rod 46 can extend into the groove body of the sliding bottom plate 42.

[0088] like Figure 9As shown, after the tube sheet is hoisted into place, the three horizontal locking devices 4 on the upper clamp 1 and the lower clamp 1 are pushed to support the outer circle of the tube sheet. Due to the inclined structural design of the clamping slider 44 and the setting of the elastic limiter 45, the horizontal locking device 4 can slide forward along the orifice plate 41, and the clamping slider 44 can slide up and down in the opening of the sliding upper plate 43, and the clamping is relatively fast; after supporting the outer circle of the tube sheet, the limiting step 446 of the clamping slider 44 will support the limiting space 413 of the orifice plate 41 away from the limiting surface of the first guide inclined surface 411 to achieve locking; when loosening the tube sheet, it is necessary to manually raise the clamping slider 44 (at this time the elastic limiter 45 is in a compressed state) so that its lowest point is higher than the surface of the orifice plate 41, slide the horizontal locking structure 4 backward, and loosen the tube sheet.

[0089] The orifice plate 41 serves as a slideway for the horizontal locking device 4 and needs to have sufficient hardness to ensure that it does not deform or wear during use. It needs to be made of low-alloy steel with a hardness of 140HRC or higher. Its structural dimensions are as follows:

[0090] The position of the limiting space 413 is designed according to the specifications and sizes of different tube sheets, and can be used for turning over tube sheets of different specifications in conjunction with the adjusting screw 3.

[0091] The front end of the limiting space 413 has an inclined surface forming a first guiding inclined surface 411 , which can be selected from 40° to 60° and is consistent with the angle of the second guiding inclined surface 441 of the clamping slider 44 , ensuring that the horizontal locking device 4 can slide forward smoothly.

[0092] The width of the limiting space 413 is 1 mm larger than the width dimension 443 of the limiting end 449 of the clamping slider 44 , and is 5 mm to 10 mm smaller than the width dimension 445 of the top of the clamping slider 44 away from the limiting end 449 .

[0093] The length of the limiting space 413 is 5 mm to 10 mm larger than the second direction length dimension 442 of the limiting end 449 of the clamping slider 44, and is 5 mm to 10 mm smaller than the second direction length dimension 444 of the clamping slider 44 away from the limiting end 449.

[0094] The threaded hole 412 on the edge of the orifice plate 41 matches the adjusting screw 3 . The length of the threaded hole 412 is 50 mm to 100 mm, which is the adjustment range of the orifice plate 41 .

[0095] The clamping slider 44 is machined from a low alloy steel plate and is a key component for the horizontal locking structure to achieve locking. Its structural dimensions are as follows:

[0096] Specifically, it also includes a horizontal adjustment device that drives the circumferential limiting device to slide along the second direction.

[0097] When the limiting step 446 is used to lock the horizontal structure, it is stuck on the limiting space 413 of the orifice plate 41. The height of each step is 10 mm and the width is 1 mm. The limiting step 446 is preferably adjusted in at least 2 levels, specifically 5 levels. When the tube sheet is turned over using the turning tool, due to the existence of various deviations (deviation of the position of the tube sheet placed on the fixture 1, deviation of the adjustment of the horizontal adjustment device, manufacturing deviation of parts, etc.), the design of the step with a gradient of 1 mm can make up for various deviations, and it will be stuck at different steps to achieve locking without a gap between the horizontal locking device 4 and the tube sheet.

[0098] Specifically, the clamping slider 44 is provided with a blind hole 447 for accommodating the elastic limiting member 45 , and the depth and diameter of the blind hole 447 are designed according to the specifications of the elastic limiting member 45 .

[0099] In order to facilitate the sliding of the clamping slider 44, preferably, the two opposite ends of the clamping slider in the second direction are designed as arcs 448, which can make it slide more smoothly in the sliding upper plate 43.

[0100] The sliding upper plate 43 of the mounting seat is preferably machined from a low alloy steel plate, which needs to have sufficient hardness to ensure that it does not deform or wear during use. Low alloy steel with a hardness of 140HRC or above must be selected, and the clamping slider 44 slides up and down inside it.

[0101] like Figure 33 As shown, the slide groove 431 is preferably a waist-shaped opening 431 whose size matches the outer contour of the clamping slider 44, and the gap between the two is controlled at 0.1 to 0.2 mm to ensure machining accuracy. Lubricating oil can be applied before installation to ensure smooth sliding.

[0102] The sliding upper plate 43 is provided with a through hole 432 , the size and opening position of which are consistent with those of the sliding bottom plate 42 , for bolts 47 to fasten the two together, forming a channel for sliding on the orifice plate 41 .

[0103] The threaded hole 433 of the sliding upper plate 43 is used to fasten the pressing rod 46, and the remaining shapes can be designed by yourself.

[0104] The sliding bottom plate 42 is machined from a low alloy steel plate and needs to have sufficient hardness to ensure that it does not deform or wear during use. A low alloy steel with a hardness of 140HRC or more is selected to match the sliding upper plate 43 to form a channel that slides on the orifice plate 41. Its structural shape is as follows: Figure 36 shown.

[0105] The width of the groove 421 of the sliding bottom plate 42 is 0.1mm to 0.2mm larger than the width of the orifice plate 41, ensuring that the machined surface roughness is R3.2μm; the depth of the groove 421 is 0.1 to 0.2mm larger than the thickness of the orifice plate 41; to ensure smooth sliding, lubricating oil can be applied.

[0106] The function of the pressure rod 46 is to press the elastic limiter 45, which is made of round steel or steel plate. Figure 14 As shown, the structural dimensions are as follows:

[0107] The outer diameter 461 of the pressure rod 46 matches the blind hole 447, and the gap is controlled within 0.5 mm.

[0108] The length dimension 462 is determined according to the dimensions of the deep hole of the blind hole 447 and the elastic limiting member 45 .

[0109] The elastic limiting member 45 is used ingeniously, which can provide the clamping slider 44 with a downward force, so that the horizontal locking device 4 can be automatically locked when it slides to a suitable position.

[0110] Specifically, the clamp 1 is provided with a top shaft 19, the horizontal adjustment device 3 includes a first screw 32 and a rotating protrusion 31, and the clamp 1 is provided with a first through hole 13 for the threaded portion of the first screw 3 to pass through. The threaded portion is threadedly connected to the orifice plate 41 to drive the orifice plate 41 to slide along the second direction. The rotating protrusion 31 is fixedly connected to the first screw 32, and the top shaft 19 is installed on the clamp 1. The top shaft 19 is sleeved on the outside of the rotating protrusion 31 and is clearance-matched with the rotating protrusion 31. The top shaft 19 limits the rotating protrusion 31 at both ends along the second direction to limit the first screw 32 from sliding along the second direction. Each clamp 1 is provided with three second screws 5, which are located at the three ends of the clamp 1 and are connected to the orifice plate 41 of the horizontal locking device 4 through threads. The position of the orifice plate 41 on the clamp 1 is adjusted according to the outer diameter of the tube plate, so that when the horizontal locking device 4 supports the outer circle of the tube plate, the step of the clamping slider 44 can just clamp the limit space 413 of the orifice plate 41, so that this turning tool can be suitable for lifting and turning tube plates of different specifications.

[0111] The limiting space 413 is a through hole evenly distributed in three parts, and its diameter is preferably 3 to 5 mm larger than the outer diameter of the second screw 5 to facilitate the penetration of the second screw 5.

[0112] The structure of the orifice plate chute 12 is as follows Figure 12 As shown, for clarity, this figure does not show the horizontal adjustment device 3, the horizontal locking device 4, etc. The pressing plate includes a first pressing plate 16 and a second pressing plate 17 at opposite ends of the second direction of the pressing hole plate 41, which are specifically described as follows:

[0113] The width 121 of the orifice plate chute 12 is preferably 0.1mm to 0.2mm larger than the width of the orifice plate 41, and the depth 123 of the orifice plate chute 12 is preferably 0.1mm to 0.2mm larger than the thickness of the orifice plate 41. The orifice plate 41 can be loaded into the orifice plate chute 12 (such as Figure 13 As shown), and after the first pressing plate 16 and the second pressing plate 17 are installed (as shown Figure 14As shown), the orifice plate 41 can slide in the orifice plate slot 12 without gap, and lubricating oil is applied during installation.

[0114] The total length 122 of the orifice plate chute 12 is 50 mm to 100 mm greater than the length of the orifice plate 41 , which is the adjustable range of the orifice plate 41 in the orifice plate chute 12 .

[0115] The installation slot size 124 of the orifice plate chute 12 is consistent with the thickness of the first pressing plate 16 and the second pressing plate 17, ensuring that the surface of the first pressing plate 16 and the second pressing plate 17 are flush with the surface of the fixture 1 after installation (such as Figure 14 shown).

[0116] The outer dimension 125 of the orifice plate chute 12 on the fixture 1 matches the dimension of the horizontal locking device 4, and it is necessary to ensure that the horizontal locking structure 4 can slide smoothly without interference after installation (such as Figure 12 shown).

[0117] The first through hole 13 (such as Figure 12 The diameter of the through hole 13 is 1 mm larger than the outer diameter of the adjusting screw 3, and the straightness of the through hole 13 is controlled within 0.1 mm to ensure smooth rotation.

[0118] The first threaded hole 14 and the second threaded hole 15 are used to fix the first pressing plate 16 and the second pressing plate 17 (such as Figure 12 、 13 shown).

[0119] The first pressing plate 16 and the second pressing plate 17 are fixed to the fixture 1 by screws 18. Specifically, the screws 18 are preferably countersunk screws. After installation, the surfaces of the first pressing plate 16 and the second pressing plate 17 are flush with the surface of the fixture 1 (e.g. Figure 15 shown).

[0120] The top shaft 19 is welded to the end of the fixture 1. The first screw 32 passes through the first through hole of the fixture 1 and matches the threaded hole 412 on the orifice plate 41. The thread engagement length of the first screw 32 is 50mm to 100mm, which is the adjustable range of the orifice plate 41. The specific structure is described as follows:

[0121] Rotating protrusion 31 (such as Figure 16 As shown) the structural dimensions and top shaft groove 191 (as shown) Figure 17 As shown in the figure, the inner diameter of the top shaft groove 191 is 0.1mm to 0.2mm larger than the outer diameter of the rotating protrusion 31; the depth of the top shaft groove 191 is 0.1mm to 0.2mm larger than the thickness of the top shaft groove 31; the opening diameter 192 of the top shaft 19 is 1mm larger than the diameter of the adjusting screw 3, and the two are as shown in the figure. Figure 15 After the assembly shown, the adjusting screw 3 can rotate freely.

[0122] The threaded end of the first screw rod 32 matches the threaded hole 412 of the orifice plate 41 , and the length of the first screw rod 32 is sufficient to ensure the adjustment range of the orifice plate 41 .

[0123] The thread length 33 of the first screw 32 must ensure that it can pass through the fixture 1, engage with the thread of the orifice plate 41, and have a sufficient adjustment range.

[0124] The fixture 1 is provided with an orifice plate slot 12 for accommodating the orifice plate 41. The orifice plate slot 12 extends along the second direction. The orifice plate 41 can slide along the orifice plate slot 12. The orifice plate 41 is limited in the orifice plate slot 12 by a pressure plate, and the pressure plate is fixedly connected to the fixture 1.

[0125] In a specific embodiment, the clamp locking device includes a second screw 5 and a vertical locking device 6. The vertical locking device 6 includes a locking sleeve 61, a fine-tuning nut 63 threadedly connected to the second screw 5, and a locking assembly for locking the locking sleeve 61 and the second screw 5. The fine-tuning nut 63 is threadedly connected to the second screw 5. The limiter 53 at the end of the second screw 5 away from the vertical locking device 6 abuts against the outer side of one of the clamps 1. The side of the fine-tuning nut 63 close to the limiter 53 abuts against the outer side of the other clamp 1. The locking sleeve 61 is sleeved on the outside of the second screw 5. The clamp 1 is provided with an opening 11 for the second screw 5 to pass through. The opening 11 is provided on the clamp 1 for the second screw 5 to pass through. The opening 11 is a through hole, and its diameter is preferably 3 mm to 5 mm larger than the outer diameter of the second screw 5 to facilitate the insertion of the second screw 5.

[0126] There are three evenly distributed clamp locking devices, which cooperate with the screw 5 to achieve rapid locking in the vertical direction, clamping the tube sheet to be turned over between the two clamps 1. At the same time, it is easy to disassemble and saves the time required for rotating the nut of the traditional clamp.

[0127] The interior of the locking sleeve 61 is a hollow stepped hole structure, and the fine-tuning nut 63 is located inside the locking sleeve 61 near the locking assembly 62. One of the locking sleeve 61 and the second screw 5 is provided with a locking groove, and the other is provided with a locking rail arranged in the locking groove.

[0128] In a specific embodiment, the locking assembly includes a locking rod 62, a first limiting hole 614 provided on the locking sleeve 61, and a second limiting hole 52 provided on the second screw 5, wherein the second limiting hole 52 is provided in a plurality of ways along the first direction, and the first limiting hole 614 includes an internal limiting hole that can be connected to the outside of the second limiting hole 52, an external limiting hole away from the second limiting hole 52, and a connecting hole between the internal limiting hole and the external limiting hole, so that the locking rod 62 slides from the external limiting hole into the internal limiting hole and the middle through hole of the second limiting hole 52; the locking rod 62 is a dumbbell-shaped rod, with both ends of the locking rod 62 protruding from the ends of the second limiting hole 52; the middle connecting member 624 of the locking rod 62 is a flat strip structure; along the first direction, the first dimension of the second limiting hole 52, the inner limiting hole, and the outer limiting hole is greater than the second dimension of the middle through hole; the width of the middle connecting member 624 along a cross section perpendicular to the sliding direction of the locking rod 62 is less than the second dimension; the length of the middle connecting member 624 is greater than the second dimension and less than the first dimension, so that the middle connecting member 624 can slide in the middle through hole and rotate in the second limiting hole 52, the inner limiting hole, and the outer limiting hole.

[0129] Specifically, the second screw 5 is machined from round steel, such as Figure 23 As shown, its structural dimensions are introduced as follows:

[0130] The total length of the second screw 5 is designed according to the thickness of the tube sheet and the thickness of the clamp 1. It must ensure that after it passes through the two clamps 1, the second limiting hole 52 at the upper end can be completely or partially exposed from the clamp 1, and the vertical locking device 6 can be locked.

[0131] A locking groove 51 is provided on the second screw 5. The width of the locking groove 51 should be 0.5 mm larger than the width of the locking rail 612. The surfaces of the locking rail 612 and the locking groove 51 should be polished smooth to ensure smooth sliding of the vertical locking device 6.

[0132] The internal limiting holes and external limiting holes inside and outside the first limiting hole 614 are preferably circular holes, and the diameter of the circular holes is the same as the diameter of the circular holes of the second limiting holes 52 on the first screw 5. The spacing of the second limiting holes 52 must be ensured to be within the adjustment range of the fine-tuning nut 63; the number of the second limiting holes 52 is determined according to needs.

[0133] The vertical locking device 6 is mechanically locked with the screw rod 5, which is more convenient and faster than the traditional nut tightening method. When in use, calculate the distance between the bottom of the fine-adjusting nut 63 and the center line of the first limiting hole 614 according to the position and size of the clamp 1, the tube plate to be turned over, and the second limiting hole 52 in the second screw rod 5. Adjust the fine-adjusting nut 63 according to this distance to ensure that after the vertical locking device 6 is installed on the second screw rod 5, the first limiting hole 614 corresponds to the second limiting hole 52 on the second screw rod 5, and then test install it. Then slide the locking rod 62 into the outer circular hole of the first limiting hole 614 (such as Figure 7 Align the locking rail 612 on the locking sleeve with the locking groove 51 on the second screw 5 and slide it downward. After the vertical locking device 6 is installed in place, slide the locking rod 62 into the inner limiting hole inside the first limiting hole 614 and rotate it to a preset angle to achieve locking, specifically 90°.

[0134] The locking sleeve 61 has a structural form as follows: Figure 7 As shown, it can be made of cast iron or cast aluminum, or it can be machined from round steel.

[0135] The inner diameter size 611 of the locking sleeve 61 matches the outer diameter size of the second screw 5, and needs to be 0.5 to 1 mm larger than the outer diameter size of the second screw 5. The surface roughness of the inner diameter of the locking sleeve 61 is controlled below Ra3.2μm to ensure that the second screw 5 can slide smoothly in the locking sleeve 61.

[0136] The locking rail 612 matches the size of the locking groove 51 on the second screw 5, and plays a guiding role during the installation of the horizontal adjustment device 3; the width of the locking groove 51 needs to be 0.5 mm larger than the width of the locking rail 612, and the surfaces of the locking rail 612 and the locking groove 51 need to be polished smooth to ensure smooth sliding of the vertical locking device 6.

[0137] The internal thread 613 of the locking sleeve 61 matches the external thread of the fine-tuning nut 63. The thread length of the internal thread 613 is as long as possible to make its adjustable range as large as possible, so that the vertical locking device 6 can meet the requirements of tube sheet installation with different thicknesses.

[0138] The size of the first limiting hole 614 matches the size of the locking rod 62; the first limiting hole 614 is preferably a dumbbell hole, and the diameter of the circular hole in the inner limiting hole and the outer limiting hole of the first limiting hole 614 is preferably 0.2mm~0.3mm larger than the outer diameter 621 of the locking rod 62, to ensure that the locking rod 62 can rotate freely in the first limiting hole 614 without a large gap; the circular hole diameter size of the inner limiting hole and the outer limiting hole of the first limiting hole 614 is the same as the diameter size of the slotted circular hole of the second limiting hole 52 of the second screw 5; the narrow channel width of the first limiting hole 614 is preferably 0.3mm~0.5mm larger than the width dimension 622 of the middle connecting piece 624 of the locking rod 62, and the width dimension 622 of the locking rod 622 is preferably 1 / 3~1 / 2 of the length dimension 621, and the length direction has a circular arc diameter dimension.

[0139] In this application, the clamp 1 is the basic device for installing and positioning the horizontal adjustment device 3, the horizontal locking device 4, the second screw 5, and the vertical locking device 6; the clamp 1 is the main supporting component for turning the tube sheet, and it must have sufficient rigidity to prevent deformation after being hoisted.

[0140] The horizontal adjustment device 3 is located at the three ends of the clamp 1 and is connected to the orifice plate 41 of the horizontal locking device 4 through threads. The position of the orifice plate 41 on the clamp 1 is adjusted according to the outer diameter of the tube plate, so that when the horizontal locking device 4 supports the outer circle of the tube plate, the limiting step 446 of the clamping slider 44 can just clamp the side of the limiting space 413 of the orifice plate 41, so that this turning tool can be used for lifting and turning tube plates of different specifications.

[0141] The horizontal locking device 4 is fixed on the clamp 1, with three evenly distributed ones. It is a linear ratchet structure that can achieve rapid sliding and locking in the horizontal direction, supporting the tube sheet to prevent it from moving during the turning process. It is also easy to disassemble, saving the time required for rotating the nut of the traditional turning tool.

[0142] There are three evenly distributed vertical locking devices 3, which cooperate with the second screw 5 to achieve rapid locking in the vertical direction, clamping the tube sheet to be turned over between the two clamps 1. At the same time, it is easy to disassemble and saves the time required for rotating the nut of the traditional clamp.

[0143] The tube sheet turning device provided in this application is used in a specific manner:

[0144] Step 1: Draw the center line on fixture 1 in advance, and draw the corresponding center line on the tube sheet. When the tube sheet is hung on fixture 1, the center lines should be aligned as much as possible with a deviation of no more than 5mm.

[0145] Step 2: Lay the lower fixture 1 flat and use lifting tools such as plate hooks and ring clamps to lift the tube sheet onto the fixture 1. If the tube sheet needs to maintain the preheating temperature during the double-sided cladding and turning process, the turning time needs to be shortened as much as possible. The tube sheet needs to be lifted onto the lower fixture 1 first, and the preheating and cladding processes need to be carried out on the fixture 1. Install the shackles on the lifting ears of the upper fixture 1 in advance.

[0146] Step 3: Lift the upper clamp 1 and place it on the tube sheet, and pass the second screw 5 through the corresponding through holes of the upper and lower clamps 1.

[0147] Step 4, install the locking sleeve 61, and adjust the fine-tuning nut 63 to the appropriate position in advance according to the thickness of the tube sheet to be turned over and the clamp 1 to ensure that after the locking sleeve 61 and the second screw 5 are installed, the locking slide rail 612 on the locking sleeve 61 can correspond to the locking slide groove 51 on the second screw 5; before installing the locking sleeve 61, slide the locking rod 62 into the external limiting hole outside the first limiting hole 614 of the locking sleeve 61 until the fine-tuning nut 63 is tightly attached to the clamp 1.

[0148] Step 5: Slide the locking rod 62 through the middle through hole of the first limiting hole 614 to the inner limiting hole. The locking rod 62 can be rotated 90 degrees. Figure 6 As shown, due to its own structural reasons, it cannot pass through the middle through hole after rotating 90 degrees, and at the same time achieves vertical locking.

[0149] Step 6: Tighten the fine-tuning nut 63 by hand to further clamp the locking rod 62 so that it cannot rotate or slide out, thereby increasing safety.

[0150] Step 7. According to the specifications of the tube sheet, use the adjusting screw 3 to adjust the orifice plate 41 of the horizontal locking device 4 to the appropriate position in advance to ensure that the orifice plate 41 is clamped by the clamping slider 44 while the horizontal locking device 4 can support the tube sheet to lock it; during specific use, the three horizontal locking devices 4 on the upper and lower side clamps 1 are marked out of the tube sheet covering area in advance. When sliding, the clamping slider 44 needs to be pulled up by hand so that it does not interfere with the limit space 413 of the orifice plate 41 when sliding.

[0151] In step 8, the three horizontal locking devices 4 on the upper and lower clamps 1 are pushed against the outer circle of the tube sheet. Due to the guide slope design of the clamping slider 44 and the upper limit space 413 of the orifice plate 41, the horizontal locking structure 4 can slide forward on the orifice plate 41. The position of the opening 411 on the orifice plate 41 is designed according to the specifications of the tube sheet to be turned over. It is a theoretical position and can be adjusted by adjusting the screw 3. The tube sheet is lifted onto the clamp 1. The deviation between the center line of the tube sheet and the center line of the clamp 1 can be compensated by the stepped structure on the clamping slider 44 to avoid a gap between the horizontal locking device 4 and the outer circle of the tube sheet.

[0152] Step 9: The sling shackles and wire ropes hung on the first lifting eye 21 and the second lifting eye 22 on the clamp 1 are hung on the same overhead crane hook, and the third lifting eye 23 on the clamp 1 is hung on another overhead crane hook. This design can make the angle between the shackle installed on the lifting eye and the lifting eye smaller, the shackle is evenly stressed, and the risk of deformation and breakage of the shackle is reduced.

[0153] Step 10: After the workpiece is lifted to a sufficient height for turning over the tube sheet, the hook at the third lifting ear 23 is lowered until it is not under stress, the shackle at the third lifting ear 23 is removed, and the shackle is installed on the third lifting ear 23 on the other side of the fixture 1. The workpiece is slowly lifted up until the tube sheet is in a horizontal state and placed on the ground to complete the turning.

[0154] Step 11: Slide the locking rod 32 through the narrow channel of the dumbbell hole of the locking sleeve 31 to the outer opening, remove the vertical locking device 6, and pull out the screw 5.

[0155] Step 12: Lift the clamping slider 45 by hand, slide the horizontal locking device 4 backward, and loosen the tube sheet.

[0156] Step 13: Lift the upper sling 1 and proceed to the following process.

[0157] The tube sheet turning tool provided by the present application has many characteristics such as high strength, ingenious design, rapid clamping and locking of workpieces, and high safety during the turning process. This turning tool and cylindrical workpieces such as tube sheets and cylinders are completely clamped mechanically and have high safety. There is no need to weld temporary lifting ears and other accessories on the workpiece. The shackles can be installed on the turning tool in advance, which shortens the turning time of the workpiece and facilitates its widespread promotion and use.

[0158] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0159] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A tube sheet turning tool, characterized in that: include: A clamp (1), wherein the clamp (1) comprises two clamps, the two clamps (1) being attached to opposite sides of a workpiece, and the clamps (1) are provided with lifting ears (2); A clamp locking device for locking the two clamps (1); and a circumferential limiting device mounted on the fixture (1) and used for limiting the circumference of the workpiece, wherein the fixture (1) is provided with at least three of the circumferential limiting devices; The circumferential limiting device comprises a horizontal locking device (4), and the horizontal locking device (4) comprises: A hole plate (41), wherein the hole plate (41) is provided with a plurality of limiting spaces along a second direction, wherein the second direction is a direction in which the hole plate (41) approaches or moves away from the center of the fixture (1); A sliding seat that is slidably matched with the orifice plate (41) and can slide along the second direction, and the side wall of the sliding seat is used to abut against the side wall of the workpiece; the sliding seat includes a locking position that can be engaged with the limit space and a sliding position that can be withdrawn from the limit space, when the sliding seat is in the locking position, the orifice plate (41) and the sliding seat are relatively fixed; when the sliding seat is in the sliding position, the sliding seat can slide along the second direction; the sliding seat includes a mounting seat, a clamping slider (44), a pressure rod (46) and one end connected to the clamping slider (44), the other end connected to the pressure rod (46), and is used to press the limit end (449) of the clamping slider (44) to the limit space. The elastic limiting member (45) of the positioning space is fixedly connected to the pressure rod (46), and the mounting seat is slidably mounted on the orifice plate (41). The mounting seat is provided with a sliding groove (431) for accommodating the clamping slider (44). The clamping slider (44) can slide along the sliding groove (431) to make the limiting end slide into and out of the positioning space. The limiting space is provided with a first guiding inclined surface (411) on the side close to the center of the clamp (1). The limiting end is provided with a second guiding inclined surface (441) that can be in contact with the first guiding inclined surface. The limiting end is provided with a limiting step (446) that can abut against the positioning space on the side away from the center of the clamp (1); A horizontal adjustment device for driving the circumferential limiting device to slide along the second direction, wherein the clamp (1) is provided with a top shaft (19), and the horizontal adjustment device (3) includes a first screw (32) and a rotating protrusion (31), and the clamp (1) is provided with a first through hole (13) for the threaded portion of the first screw (32) to pass through, the threaded portion is threadedly connected to the orifice plate (41) to drive the orifice plate (41) to slide along the second direction, the rotating protrusion (31) is fixedly connected to the first screw (32), the top shaft (19) is sleeved on the outside of the rotating protrusion (31), and is clearance-matched with the rotating protrusion (31), and the top shaft (19) limits the rotating protrusion (31) at both ends along the second direction to limit the first screw (32) from sliding along the second direction.

2. The tube sheet turning tool according to claim 1, characterized in that: The circumferential limiting devices are evenly distributed along the circumference of the workpiece; along a first direction, the circumferential limiting devices on the two clamps (1) correspond one to one, and the first direction is the direction in which the two clamps (1) are stacked.

3. The tube sheet turning tool according to claim 1, characterized in that: The fixture (1) is provided with an orifice plate slot (12) for accommodating the orifice plate (41), the orifice plate slot (12) extending along the second direction, the orifice plate (41) being able to slide along the orifice plate slot (12), the orifice plate (41) being limited in the orifice plate slot (12) by a pressure plate, and the pressure plate being fixedly connected to the fixture (1).

4. The tube sheet turning tool according to claim 1, characterized in that: The clamp locking device includes a second screw (5) and a vertical locking device (6), the vertical locking device (6) includes a locking sleeve (61), a fine-tuning nut (63) threadedly connected to the second screw (5), and a locking assembly for locking the locking sleeve (61) and the second screw (5), the fine-tuning nut (63) is threadedly connected to the second screw (5), the limiting piece (53) at one end of the second screw (5) away from the vertical locking device (6) abuts against the outer side surface of one of the clamps (1), the side of the fine-tuning nut (63) close to the limiting piece (53) abuts against the outer side surface of the other clamp (1), the locking sleeve (61) is sleeved on the outer side of the screw end of the second screw (5), and the clamp (1) is provided with an opening (11) for the second screw (5) to pass through.

5. The tube sheet turning tool according to claim 4, characterized in that: The interior of the locking sleeve (61) is a hollow stepped hole structure, and the fine-tuning nut (63) is located inside the locking sleeve (61) near the side of the locking assembly. One of the locking sleeve (61) and the second screw (5) is provided with a locking groove, and the other is provided with a locking rail arranged in the locking groove.

6. The tube sheet turning tool according to claim 4, characterized in that: The locking assembly includes a locking rod (62), a first limiting hole (614) provided on the locking sleeve (61), and a second limiting hole (52) provided on the second screw (5), wherein a plurality of the second limiting holes (52) are provided along a first direction, the first limiting hole (614) includes an internal limiting hole that can be connected to the outside of the second limiting hole (52), an external limiting hole away from the second limiting hole (52), and a middle through hole connecting the internal limiting hole and the external limiting hole so that the locking rod (62) slides from the external limiting hole into the internal limiting hole and the second limiting hole (52); the locking rod (62) is a dumbbell-shaped rod, and the locking rod ( 62) has two ends protruding from the two ends of the second limiting hole (52), and the middle connecting piece (624) of the locking rod (62) is a flat strip structure; along the first direction, the first size of the second limiting hole (52), the internal limiting hole and the external limiting hole is larger than the second size of the middle through hole; the width of the middle connecting piece (624) along the cross section perpendicular to the sliding direction of the locking rod (62) is smaller than the second size; the length of the middle connecting piece (624) is larger than the second size and smaller than the first size, so that the middle connecting piece (624) can slide in the middle through hole and rotate in the second limiting hole (52), the internal limiting hole and the external limiting hole.

7. The tube sheet turning tool according to any one of claims 1 to 6, characterized in that: Each clamp (1) is provided with two or at least three lifting ears (2), and the lifting ears (2) on the same clamp (1) are evenly distributed in the circumferential direction with the center of the clamp (1) as the center.

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