Pipe bending mechanism for overhauling steam turbine of thermal power plant

Abstract

The invention relates to the technical field of pipe bending, in particular to a pipe bending mechanism for overhauling a steam turbine of a thermal power plant, which comprises a workbench, a clamping assembly, a center assembly and a bending assembly are sequentially arranged on the workbench along the length direction of the workbench, one end of a to-be-bent pipe is clamped on the clamping assembly, and the other end of the to-be-bent pipe penetrates through the center assembly and is arranged on the bending assembly. Wherein the bending center of the pipe fitting corresponds to the center assembly; by means of the clamping assembly, the bending assembly and the center assembly which are ingenious in structure, accurate clamping and bending of pipe fittings with different diameters are achieved, it is ensured that the bending center position of the pipe fittings is accurate, and the situation that the bending center deviates due to sliding of the pipe fittings in the bending process is prevented; according to the clamping assembly, the penetrating pipe with the adjustable diameter and the clamping sliding rails on the two sides are adopted and matched with the arc-shaped clamping plates, it can be guaranteed that the pipe fitting is stably fixed in the bending operation process, meanwhile, the double-shaft lead screw and the synchronous part are arranged, synchronous movement between the two clamping parts is achieved, and it is guaranteed that the two ends of the pipe fitting are clamped at the same time and synchronously.

Description

Technical Field

[0001] The invention relates to the technical field of pipe bending, in particular to a pipe bending mechanism for overhauling a steam turbine in a thermal power plant. Background Art

[0002] At present, pipes and pipe systems of various diameters are widely used in industrial production, covering a variety of specifications from small instrument pipes to large transmission pipes with a diameter of several meters. For example, the pipes involved in the steam turbines of thermal power plants need to be able to bend pipes of different diameters to meet the needs of different application scenarios, so as to achieve flexible layout and connection of the pipe system. However, the existing pipe bending machines on the market are mainly designed for pipes of specific diameters, which are difficult to adapt to the flexible needs of multiple diameters, and are inconvenient to use and inefficient.

[0003] In addition, the choice of pipe bending angle will also affect its structural strength and functionality. Different types of pipes, such as drainage pipes, pressure pipes, gas pipes, etc., have different requirements for the choice of bending angles. Most of the existing pipe bending machines can only achieve bending at a set angle and cannot meet the need to continuously adjust the bending angle, resulting in unsatisfactory bending effects and even damage to the pipe fittings.

[0004] Therefore, there is an urgent need for a pipe bending machine that can adapt to a variety of diameters and support dynamic adjustment of bending angles to meet the complex needs of industrial production for pipe bending. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a pipe bending mechanism for overhauling a steam turbine in a thermal power plant.

[0006] A pipe bending mechanism for steam turbine maintenance in a thermal power plant comprises a workbench, wherein a clamping assembly, a central assembly and a bending assembly are sequentially arranged along the length direction of the workbench, one end of a pipe to be bent is clamped on the clamping assembly, and the other end passes through the central assembly and is arranged on the bending assembly, wherein the bending center of the pipe corresponds to the central assembly;

[0007] The clamping assembly includes a penetration tube arranged above the workbench, and the penetration tube is fixedly installed on the workbench through a support rod. The pipe to be bent passes through the penetration tube. Clamping members are provided at both ends of the penetration tube for clamping and fixing the pipe passing through the penetration tube.

[0008] Preferably, the penetration tube comprises a cylinder with two through ends, and two horizontally arranged mounting strips are symmetrically provided on the outer wall of the cylinder, and a mounting cross frame is commonly installed on the upper ends of several support rods located on the same side of the mounting strip, and a horizontal groove for assembling the mounting strip is opened on the mounting cross frame, and a fastening bolt acting on the mounting strip is threaded on the mounting cross frame for fastening the mounting strip to the mounting cross frame.

[0009] Preferably, the clamping member includes two clamping slide rails, which are symmetrically arranged on both sides of the same end of the cylinder, and one end of the clamping slide rail is horizontally fixed to the end of the mounting cross frame, and the other end of the clamping slide rail is fixed to the workbench through a support leg, a guide slide groove is opened on the side wall of the clamping slide rail, and a clamping slide plate is slidably arranged in the guide slide groove, a mounting seat is provided on the side of the clamping slide plate away from the guide slide groove and close to the cylinder, and an arc-shaped clamping plate is installed on the side of the mounting seat facing the cylinder through bolts.

[0010] Preferably, a synchronization member is provided between the two clamping slides of the same clamping member, and the synchronization member includes two synchronization plates, the two synchronization plates are respectively provided on the corresponding two clamping slides, and the synchronization plate is fixed to the side of the clamping slide away from the arc-shaped clamping plate, the lower end of the synchronization plate passes through the bottom of the workbench, and a synchronization sliding hole for the movement of the synchronization plate is opened on the workbench, and a double-axis screw is rotatably provided at the bottom of the workbench and corresponding to the two synchronization plates, and the lower ends of the two synchronization plates are respectively threadedly connected to the two ends of the double-axis screw.

[0011] Preferably, a limit block is installed on the clamping slide toward one side of the clamping slide rail and away from the end of the cylinder, and a limit slide groove is provided on the side wall of the guide groove for the limit block to slide. The setting of the limit block and the limit slide groove ensures the smooth movement of the arc clamping plate and the clamping slide.

[0012] Preferably, the bending assembly includes a bending tube and two vertical plates symmetrically arranged on the workbench. The bending tube structure is the same as the penetration tube structure. The bending tube is symmetrically rotated on both sides along its axial direction with a rotating shaft. The end of the rotating shaft away from the bending tube passes through the vertical plate and then rotates with a square block, and an arc hole is opened on the vertical plate for the rotating shaft to slide.

[0013] Preferably, an angle scale is provided on the arc-shaped hole along the vertical plate, and a positioning pointer is provided on the side of the direction block facing the angle scale.

[0014] Preferably, a plurality of vertical rods are provided on the workbench, and the vertical rods are used to support the bent tubes.

[0015] Preferably, the central component includes two side plates, between which an upper limit wheel and a lower limit wheel are provided so as to rotate in sequence from top to bottom, and both the upper limit wheel and the lower limit wheel are installed between the two side plates in a detachable manner, and the pipe passes through the area between the upper limit wheel and the lower limit wheel, and the bending center point of the pipe is formed by the setting of the upper limit wheel and the lower limit wheel.

[0016] Preferably, a square hole is provided at the upper end of the side plate, a square plate is slidably provided in the square hole, both ends of the upper limit wheel are rotatably provided on the two square plates, adjustment protrusions are provided on the opposite sides of the two square plates, an adjustment screw is rotatably provided on the adjustment protrusion, a positioning block is provided on the same side of the side plate as the adjustment protrusion, and a threaded hole for threaded connection of the adjustment screw is provided on the positioning block.

[0017] In summary, the present application includes at least one of the following beneficial technical effects:

[0018] 1. The present invention realizes precise clamping and bending of pipes of different diameters through ingeniously structured clamping components, bending components and center components, ensures the accurate bending center position of the pipes, and prevents the pipes from sliding during the bending process and causing the bending center to shift.

[0019] 2. The clamping assembly of the present invention adopts a through-tube with adjustable diameter and clamping slide rails on both sides, which cooperate with the arc-shaped clamping plate to ensure the stable fixation of the pipe during bending operation. At the same time, the setting of the double-axis screw and the synchronous part realizes the synchronous movement between the two clamping parts, ensuring the simultaneous and synchronous clamping of the two ends of the pipe.

[0020] 3. The bending assembly of the present invention realizes the bending operation of the pipe with the central assembly as the turning point through the cooperation of the vertical plate and the rotating shaft, and the angle scale and the positioning pointer are used to facilitate the operator to control the bending angle of the pipe.

[0021] Fourth, the center component of the present invention forms a bending center point for bending the pipe by setting an upper limit wheel and a lower limit wheel, and can be detachably installed and adjusted according to the diameter of the pipe, ensuring the accuracy of the bending center position of the pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0023] Figure 1 The structure of the present invention is schematically shown in FIG. Figure 1 .

[0024] Figure 2 The structure of the present invention is schematically shown in FIG. Figure 1 .

[0025] Figure 3 It is a structural schematic diagram of the clamping assembly of the present invention.

[0026] Figure 4 The present invention Figure 3 A partial enlarged view of point A in the middle.

[0027] Figure 5 It is a schematic structural diagram of the clamping member of the present invention.

[0028] Figure 6It is a structural schematic diagram of the synchronizer of the present invention.

[0029] Figure 7 It is a schematic diagram of the structure between the bending component and the central component of the present invention.

[0030] Figure 8 The present invention Figure 2 A partial enlarged view of point B in the middle.

[0031] Fig. 9 It is a structural schematic diagram of the central component of the present invention.

[0032] In the figure, 1, workbench; 2, clamping assembly; 3, center assembly; 4, bending assembly; 21, penetration tube; 22, support rod; 23, clamping member; 211, cylinder; 212, mounting bar; 213, mounting cross frame; 231, clamping slide rail; 232, support leg; 233, guide slide groove; 234, clamping slide plate; 235, mounting seat; 236, arc clamping plate; 237, limit block; 238, limit slide groove; 24, synchronization member; 241, synchronization plate ; 242, synchronous sliding hole; 243, double-axis screw; 41, bending tube; 42, vertical plate; 421, arc hole; 43, rotating shaft; 44, square block; 45, rotating shaft; 46, connecting rod; 47, hydraulic cylinder; 48, angle scale; 49, positioning pointer; 40, vertical rod; 31, side plate; 32, upper limit wheel; 33, lower limit wheel; 34, square hole; 35, square plate; 36, adjusting protrusion; 37, adjusting screw; 38, positioning block. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-Figure 9 Embodiments of the present invention are described in detail.

[0034] The present application discloses a pipe bending mechanism for the maintenance of steam turbines in thermal power plants, which realizes the precise clamping and bending of pipes of different diameters, ensures the accurate bending center position of the pipes, and prevents the pipes from sliding during the bending process and causing center deviation. The diameter-adjustable through-tube 21 cooperates with the arc-shaped clamping plate 236 to ensure the stable fixation of the pipes during the bending operation; the double-axis screw 243 and the synchronous member 24 realize the synchronous movement between the two clamping members 23, ensuring the simultaneous and synchronous clamping of the two ends of the pipe. The flexible bending component 4 and the center component 3, in conjunction with the angle scale 48 and the positioning pointer 49, facilitate the operator to determine the bending angle of the pipe, and adapt to pipes of different diameters through the detachable upper limit wheel 32 and the lower limit wheel 33, thereby improving the operating efficiency and accuracy.

[0035] Reference Figures 1 to 3As shown, a pipe bending mechanism for the maintenance of a steam turbine in a thermal power plant comprises a workbench 1, on which a clamping assembly 2, a center assembly 3 and a bending assembly 4 are sequentially arranged along its length direction. One end of a pipe to be bent is clamped on the clamping assembly 2, and the other end passes through the center assembly 3 and is arranged on the bending assembly 4, wherein the bending center of the pipe corresponds to the center assembly 3, and the bending center of the pipe is limited by the center assembly 3. At the same time, the pipe 41 is bent by the bending assembly 4, and the arrangement of the center assembly 3 ensures smooth bending of the pipe by the bending assembly 4.

[0036] The present invention realizes precise clamping and bending of pipes of different diameters through the ingeniously structured clamping assembly 2, bending assembly 4 and center assembly 3, ensures the accurate bending center position of the pipe, and prevents the pipe from sliding during the bending process and causing the bending center to shift.

[0037] Specifically, the clamping assembly 2 includes a penetration tube 21 arranged above the workbench 1, and the penetration tube 21 is fixedly installed on the workbench 1 through a support rod 22. The pipe to be bent passes through the penetration tube 21. Clamping members 23 are provided at both ends of the penetration tube 21 for clamping and fixing the pipe passing through the penetration tube 21.

[0038] The penetration tube 21 includes a cylinder 211 with two through ends, and two horizontally arranged mounting strips 212 are symmetrically provided on the outer wall of the cylinder 211. A mounting cross frame 213 is commonly installed on the upper ends of a plurality of support rods 22 located on the same side of the mounting strip 212. The mounting cross frame 213 is provided with a transverse groove for assembling the mounting strip 212, and the mounting cross frame 213 is threaded with a fastening bolt that acts on the mounting strip 212 and is used to fasten the mounting strip 212 to the mounting cross frame 213.

[0039] By setting the mounting strip 212 and the mounting cross frame 213, the present invention can select an appropriate cylinder 211 according to the diameter of the pipe to be bent, remove the cylinder 211 originally assembled on the mounting cross frame 213, and then install the appropriate cylinder 211 on the mounting cross frame 213 and fasten it to the mounting cross frame 213 by fastening bolts.

[0040] In summary, the present invention can clamp pipes of different diameters, thus facilitating subsequent pipe bending operations.

[0041] See also Figures 3 to 5As shown, the clamping member 23 includes two clamping slide rails 231, and the two clamping slide rails 231 are symmetrically arranged on both sides of the same end of the cylinder 211, and one end of the clamping slide rail 231 is horizontally fixed to the end of the mounting cross frame 213, and the other end of the clamping slide rail 231 is fixed to the workbench 1 through a support leg 232. A guide groove 233 is opened on the side wall of the clamping slide rail 231, and a clamping slide plate 234 is slidably arranged in the guide groove 233. A mounting seat 235 is provided on the side of the clamping slide plate 234 away from the guide groove 233 and close to the cylinder 211, and an arc-shaped clamping plate 236 is installed on the side of the mounting seat 235 facing the cylinder 211 through bolts.

[0042] The two arc-shaped clamping plates 236 move toward each other to clamp and fix the pipe to be bent that passes through the cylinder 211, ensuring that the pipe to be bent always remains in a fixed state during the bending operation, preventing the pipe from sliding in the cylinder 211 and causing the center position of the pipe to be bent to shift.

[0043] In order to ensure that the arc-shaped clamping plate 236 and the clamping slide 234 move smoothly on the clamping slide rail 231, the present invention installs a limit block 237 on the clamping slide rail 231 and one end away from the cylinder 211, and at the same time, a limit slide groove 238 is provided on the side wall of the guide slide groove 233 for the limit block 237 to slide, thereby ensuring the smooth movement of the arc-shaped clamping plate 236 and the clamping slide rail 234 through the setting of the limit block 237 and the limit slide groove 238.

[0044] See also Figure 3 and Figure 6 As shown, in order to ensure the simultaneous and synchronous movement of the two arc-shaped clamping plates 236 so that the two arc-shaped clamping plates 236 can smoothly clamp the pipe fittings, the present invention provides a synchronous member 24 between the two clamping slides 234 of the same clamping member 23. Specifically, the synchronous member 24 includes two synchronous plates 241, and the two synchronous plates 241 are respectively arranged on the corresponding two clamping slides 234, and the synchronous plates 241 are fixed on the side of the clamping slides 234 away from the arc-shaped clamping plates 236. The lower end of the synchronous plate 241 passes through the bottom of the workbench 1, and a synchronous sliding hole 242 for the synchronous plate 241 to move is opened on the workbench 1. A double-axis screw 243 is rotatably provided at the bottom of the workbench 1 and corresponding to the two synchronous plates 241. The lower ends of the two synchronous plates 241 are respectively threadedly connected to the two ends of the double-axis screw 243.

[0045] By driving the double-axis screw rod 243 to rotate, the two synchronous plates 241 can move closer to or away from each other, thereby driving the clamping slide plate 234 to move closer to or away from each other synchronously, that is, the arc clamping plate 236 can move closer to or away from each other, thereby controlling the free clamping of the cylinder 211.

[0046] In order to ensure the synchronous movement of the clamping members 23 at both ends of the cylinder 211 , the present invention can realize the synchronous and same-direction rotation of the two double-axis screw rods 243 through chain transmission, that is, realize the synchronous operation of the two clamping members 23 .

[0047] The clamping assembly 2 of the present invention adopts a through-tube 21 with adjustable diameter and clamping slide rails 231 on both sides, which cooperate with the arc-shaped clamping plate 236 to ensure the stable fixation of the pipe during bending operation. At the same time, the setting of the double-axis screw rod 243 and the synchronous member 24 realizes the synchronous movement between the two clamping members 23, ensuring the simultaneous and synchronous clamping of the two ends of the pipe.

[0048] See also Figure 1 , Figure 2 , Figure 7 and Figure 8 As shown, the bending assembly 4 includes a bending tube 41 and two vertical plates 42 symmetrically arranged on the workbench 1. The structure of the bending tube 41 is the same as that of the penetration tube 21. The bending tube 41 is symmetrically rotated on both sides along its axial direction with a rotating shaft 43. The end of the rotating shaft 43 away from the bending tube 41 passes through the vertical plate 42 and then rotates and sleeves a square block 44, and the vertical plate 42 is provided with an arc hole 421 for the rotating shaft 43 to slide.

[0049] After the pipe passes through the round tube, the central component 3 and the bending tube 41 in sequence, the two rotating shafts 43 are driven to move upward from the bottom of the arc hole 421 to drive the bending tube 41 to rotate synchronously, so that the pipe can be bent with the central component 3 as the turning point.

[0050] The vertical plate 42 is rotatably mounted with a rotating shaft 45 at the center of the arc-shaped hole 421, and a connecting rod 46 is sleeved on the rotating shaft 45. The end of the connecting rod 46 facing away from the rotating shaft 45 is connected to the square block 44. A hydraulic cylinder 47 is hinged between the connecting rod 46 and the workbench 1. The connecting rod 46 is driven to rotate by the hydraulic cylinder 47, and the connecting rod 46 will rotate around the rotating shaft 45, and then the rotating shaft 43 is driven to move upward along the arc-shaped hole 421 through the square block 44, so that the bending tube 41 can be synchronously rotated around the rotating shaft 45, thereby realizing the bending and forming of the pipe fittings.

[0051] An angle scale 48 is provided along the arc hole 421 on the vertical plate 42, and a positioning pointer 49 is provided on the side of the direction block facing the angle scale 48. When the rotating shaft 43 rotates, the square block 44 will drive the positioning pointer 49 to rotate synchronously, so that the positioning pointer 49 moves on the angle scale 48, so that the angle of the pipe when it is bent and formed can be determined, which is convenient for the staff to operate.

[0052] It should be noted that, in the initial state, the bending tube 41 is in a horizontal state, and the connecting rod 46 is also in a horizontal state, and the rotating shaft 43 is at the lowest point of the arc hole 421 .

[0053] In order to ensure that the bending tube 41 always maintains a horizontal state in the initial state, the present invention provides a plurality of vertical rods 40 on the workbench 1, and the vertical rods 40 are used to support the bending tube 41 to ensure that the bending tube 41 always maintains a horizontal state in the initial state.

[0054] The bending assembly 4 of the present invention realizes the bending operation of the pipe with the central assembly 3 as the turning point through the cooperation of the vertical plate 42 and the rotating shaft 43, and the angle scale 48 and the positioning pointer 49 facilitate the operator to control the bending angle of the pipe.

[0055] See also Figure 7 and Fig. 9 As shown, the central component 3 includes two side plates 31, between which an upper limit wheel 32 and a lower limit wheel 33 are rotated in sequence from top to bottom, and the upper limit wheel 32 and the lower limit wheel 33 are both installed between the two side plates 31 in a detachable manner. The pipe passes through the area between the upper limit wheel 32 and the lower limit wheel 33, and the bending center point of the pipe is formed by the setting of the upper limit wheel 32 and the lower limit wheel 33; the detachable installation method makes it convenient for the present invention to limit pipes of different diameters.

[0056] It should be noted that the axis of the rotating shaft 45, the axis of the upper limit wheel 32 and the axis of the lower limit wheel 33 are on the same vertical plane to ensure the uniformity of the bending center of the pipe.

[0057] A square hole 34 is provided at the upper end of the side plate 31, and a square plate 35 is slidably provided in the square hole 34. Both ends of the upper limit wheel 32 are rotatably provided on the two square plates 35. Adjustment protrusions 36 are provided on the opposite sides of the two square plates 35, and an adjustment screw 37 is rotatably provided on the adjustment protrusion 36. A positioning block 38 is provided on the same side of the side plate 31 as the adjustment protrusion 36, and a threaded hole for threaded connection of the adjustment screw 37 is provided on the positioning block 38.

[0058] By rotating the adjusting screw 37 to drive the adjusting screw 37 to spirally move in the threaded hole, the distance between the adjusting protrusion 36 and the positioning block 38 is changed, that is, the distance between the upper limit wheel 32 and the lower limit wheel 33 is changed, so as to adapt to pipes of different diameters.

[0059] The center component 3 of the present invention forms a bending center point for bending the pipe by setting an upper limit wheel 32 and a lower limit wheel 33, and can be detachably installed and adjusted according to the diameter of the pipe, ensuring the accuracy of the bending center position of the pipe.

[0060] The working principle steps of the present invention are as follows:

[0061] Step 1: Preparation and clamping of pipe fittings. By setting the installation strip 212 and the installation cross frame 213, select the through-tube 21 that matches the diameter of the pipe fitting, and then pass the pipe fitting to be bent through the through-tube 21. By setting the double-axis screw 243 and the synchronous member 24, the two clamping slide rails 231 are made to move synchronously, and the clamping slides 234 of the clamping slide rails 231 on both sides are used to clamp the pipe fitting through the arc-shaped clamping plate 236 to ensure that the pipe fitting is stable in the cylinder 211 and realize the synchronous clamping of both ends of the pipe fitting.

[0062] Step 2: Positioning and bending the pipe. Pass the pipe through the central component 3 and locate the bending center. Set the bending center point of the pipe by the upper limit wheel 32 and the lower limit wheel 33, and adjust it according to the diameter of the pipe. The pipe passes through the bending tube 41 and rotates the rotating shaft 43 symmetrically on both sides along its axial direction to achieve bending of the pipe with the central component 3 as the turning point. Drive the connecting rod 46 to rotate through the hydraulic cylinder 47, and drive the square block 44 to drive the rotating shaft 43 to move upward along the arc hole 421, so that the bending tube 41 can rotate synchronously with the rotating shaft 45 as the center to achieve the bending of the pipe.

[0063] Step 3: Angle control and end, determine the angle of the pipe when it is bent by the angle scale 48 and the positioning pointer 49. After the bending is completed, loosen the connecting rod 46 and remove the bending tube 41 to facilitate the removal of the bent pipe, and then restore it to the initial state.

[0064] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered as exemplary and non-restrictive in all respects.

[0065] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A pipe bending mechanism for overhauling a steam turbine in a thermal power plant, comprising a workbench (1), characterized in that: The workbench (1) is provided with a clamping assembly (2), a center assembly (3) and a bending assembly (4) in sequence along its length direction; one end of the pipe to be bent is clamped on the clamping assembly (2), and the other end passes through the center assembly (3) and is arranged on the bending assembly (4), wherein the bending center of the pipe corresponds to the center assembly (3); The clamping assembly (2) comprises a penetration tube (21) arranged above the workbench (1), and the penetration tube (21) is fixedly mounted on the workbench (1) via a support rod (22), and the pipe to be bent passes through the penetration tube (21), and clamping members (23) are provided at both ends of the penetration tube (21) for clamping and fixing the pipe passing through the penetration tube (21).

2. The pipe bending mechanism for steam turbine maintenance in a thermal power plant according to claim 1, characterized in that: The penetration tube (21) comprises a cylinder (211) with two ends passing through, two horizontally arranged mounting strips (212) are symmetrically provided on the outer side wall of the cylinder (211), a mounting cross frame (213) is commonly installed on the upper ends of a plurality of support rods (22) located on the same side of the mounting strip (212), a transverse groove for assembling the mounting strip (212) is provided on the mounting cross frame (213), and a fastening bolt for acting on the mounting strip (212) is threadedly provided on the mounting cross frame (213) for fastening the mounting strip (212) to the mounting cross frame (213).

3. The pipe bending mechanism for steam turbine maintenance in a thermal power plant according to claim 2, characterized in that: The clamping member (23) comprises two clamping rails (231), the two clamping rails (231) are symmetrically arranged on both sides of the same end of the cylinder (211), and one end of the clamping rail (231) is horizontally fixed to the end of the mounting cross frame (213), and the other end of the clamping rail (231) is fixed to the workbench (1) through a support leg (232), a guide groove (233) is opened on the side wall of the clamping rail (231), and a clamping slide plate (234) is slidably arranged in the guide groove (233), a mounting seat (235) is arranged on the side of the clamping slide plate (234) away from the guide groove (233) and close to the cylinder (211), and an arc clamping plate (236) is installed on the side of the mounting seat (235) facing the cylinder (211) through bolts.

4. The pipe bending mechanism for steam turbine maintenance in a thermal power plant according to claim 3, characterized in that: A synchronous member (24) is arranged between the two clamping slides (234) of the same clamping member (23), and the synchronous member (24) comprises two synchronous plates (241). The two synchronous plates (241) are respectively arranged on the two corresponding clamping slides (234), and the synchronous plates (241) are fixed on the side of the clamping slide (234) away from the arc clamping plate (236). The lower end of the synchronous plate (241) passes through the bottom of the workbench (1), and a synchronous sliding hole (242) for the synchronous plate (241) to move is opened on the workbench (1). A double-axis screw rod (243) is rotatably arranged at the bottom of the workbench (1) and corresponding to the two synchronous plates (241), and the lower ends of the two synchronous plates (241) are respectively threadedly connected to the two ends of the double-axis screw rod (243).

5. The pipe bending mechanism for steam turbine maintenance in a thermal power plant according to claim 3, characterized in that: A limiting block (237) is installed on one end of the clamping slide plate (234) facing the clamping slide rail (231) and away from the cylinder (211), and a limiting slide groove (238) is provided on the side wall of the guide slide groove (233) for the limiting block (237) to slide. The setting of the limiting block (237) and the limiting slide groove (238) ensures the smooth and stable movement of the arc clamping plate (236) and the clamping slide plate (234).

6. The pipe bending mechanism for steam turbine maintenance in a thermal power plant according to claim 1, characterized in that: The bending assembly (4) comprises a bending tube (41) and two vertical plates (42) symmetrically arranged on the workbench (1). The structure of the bending tube (41) is the same as that of the penetration tube (21). The bending tube (41) is symmetrically rotatably provided with a rotating shaft (43) on both sides along the axial direction thereof. One end of the rotating shaft (43) away from the bending tube (41) passes through the vertical plates (42) and then rotatably sleeved with a square block (44). The vertical plates (42) are provided with an arc-shaped hole (421) for the rotating shaft (43) to slide.

7. The pipe bending mechanism for steam turbine maintenance in a thermal power plant according to claim 6, characterized in that: An angle scale (48) is provided on the vertical plate (42) along the arc-shaped hole (421), and a positioning pointer (49) is provided on the side of the direction block facing the angle scale (48).

8. The pipe bending mechanism for steam turbine maintenance in a thermal power plant according to claim 6, characterized in that: A plurality of vertical rods (40) are arranged on the workbench (1), and the vertical rods (40) are used to support the bent tubes (41).

9. The pipe bending mechanism for steam turbine maintenance in a thermal power plant according to claim 1, characterized in that: The central component (3) comprises two side plates (31), an upper limit wheel (32) and a lower limit wheel (33) are arranged between the two side plates (31) so as to rotate from top to bottom in sequence, and the upper limit wheel (32) and the lower limit wheel (33) are both detachably mounted between the two side plates (31), the pipe fitting passes through the area between the upper limit wheel (32) and the lower limit wheel (33), and the bending center point of the pipe fitting is formed by the arrangement of the upper limit wheel (32) and the lower limit wheel (33).

10. The pipe bending mechanism for steam turbine maintenance in a thermal power plant according to claim 9, characterized in that: A square hole (34) is provided at the upper end of the side plate (31), a square plate (35) is slidably provided in the square hole (34), both ends of the upper limit wheel (32) are rotatably provided on the two square plates (35), the two square plates (35) are provided with adjustment protrusions (36) on the opposite sides, and an adjustment screw (37) is rotatably provided on the adjustment protrusion (36), and a positioning block (38) is provided on the same side of the side plate (31) as the adjustment protrusion (36), and a threaded hole for threaded connection of the adjustment screw (37) is provided on the positioning block (38).

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