Auxiliary device for assembling nuclear power fluctuation pipe core mold

Abstract

The utility model belongs to the technical field of pipeline production and manufacturing, and particularly relates to an auxiliary device for nuclear power fluctuation pipe core mold assembly, which comprises a travelling crane, a rack is arranged below the suspension arm, and a baffle, a pipe blank support, a core mold support and a telescopic push rod which are arranged from back to front are arranged on the rack; the horizontal direction perpendicular to the front-back direction is set as a second horizontal direction; the pipe blank support comprises two pipe blank limiting blocks which are adjustable in height and arranged in the second horizontal direction in a spaced mode. The core mold support comprises two core mold limiting blocks arranged in the second horizontal direction in a spaced mode. The center line of the core mold limiting space and the center line of the pipe blank limiting space are arranged in the front-back direction, and the projections of the core mold limiting space and the pipe blank limiting space on the horizontal plane are coaxial. The telescopic push rod is arranged to push the core mold sections into the straight pipe blank in sequence, so that the operation of loading the previous core mold section into the straight pipe blank and the integrated assembly operation of the next core mold section can be carried out at the same time, the efficiency of loading the core mold assembly into the straight pipe blank is improved, and manpower is saved.

Description

Technical Field

[0001] This utility model belongs to the field of pipeline manufacturing technology, specifically relating to an auxiliary device for assembling nuclear power plant wave tube core molds. Background Technology

[0002] The nuclear power plant surge tube is a crucial component connecting the hot section of the main piping of the nuclear reactor coolant system and the lower end cap of the pressurizer. Its primary function is to regulate the reactor's output power, ensuring stable operation. The nuclear power plant surge tube is a nitrogen-added ultra-low carbon austenitic stainless steel bend, requiring a bending angle accuracy of ±0.5°, an ellipticity below 4%, and a thinning rate of 12.5%. The precision requirements for its structural dimensions, ellipticity, and thinning amount are extremely high, making its manufacturing challenging. Conventional bending and forming methods are insufficient to meet these requirements.

[0003] To ensure the manufacturing precision of nuclear power plant surge tubes, the bending and forming of these tubes currently mainly employs compression molding. Before bending, a mandrel assembly must be used to fill the tube blank to ensure the required ellipticity. This mandrel assembly consists of multiple mandrel segments of varying lengths. Chinese invention patent application number 201610035825.X, published on August 4, 2015, discloses an intermittent manufacturing mandrel assembly for nuclear power plant voltage regulator surge tubes. This assembly includes three mandrel segments supporting key parts of the bent tube. These three segments are spaced apart along the axial direction of the straight tube blank. Support rods are provided between adjacent tube blank segments to support the adjacent mandrel segments. Each mandrel segment includes an upper mandrel, a lower mandrel, and a wedge located between them.

[0004] Currently, the main on-site assembly is done using overhead cranes to complete the assembly of individual core mold segments, core mold assemblies, and straight pipe blanks. For example... Figure 1-2 As shown, the production site floor is paved with steel plates 11, on which baffles 12 and two horizontal positioning blocks 13 are welded. The two horizontal positioning blocks 13 are arranged along the length of the center line of the V-shaped positioning groove 131. Each of the two horizontal positioning blocks 13 is provided with a V-shaped positioning groove 131. Lifting holes are provided on both sides of the upper end of the V-shaped positioning groove 131 of the horizontal positioning block 13 away from the baffle 12. The axis of the lifting holes is arranged horizontally and perpendicular to the center line of the V-shaped positioning groove 131. The straight pipe blank 10 is placed in the V-shaped positioning groove 131, which positions the straight pipe blank 10 in its horizontal radial direction. The baffle 12 abuts against one end face of the straight pipe blank 10. A jack 14 is mounted on the side of the straight pipe blank 10 away from the baffle 12, and a support plate 15 is provided at the top of the jack 14. Both sides of the straight pipe blank 10 are provided with fixed pulleys 17. A hanging rope is passed through the center hole of the fixed pulley 17. The hanging rope on the fixed pulley 17 is passed through the lifting hole of the horizontal positioning block 13 so that the fixed pulley is suspended on the horizontal positioning block 13.

[0005] When assembling the core assembly, the overhead crane 2 first lifts and assembles the components, such as the upper core 31, lower core 32, and wedges 33, which constitute the core mold segment 3, into a single cylindrical structure. The upper core 31 and wedges 33, and the lower core 32 and wedges 33, are connected by guide rods 34, which are parallel to the center line of the core mold segment 3. The end of the core mold segment 3 away from the straight tube blank 10 is connected to an ejector tool 35, which has lifting lugs on both sides of the end away from the core mold segment 3. Then, the overhead crane 2 lifts the assembled core mold segment 3 onto the support plate 15 at the top of the jack 14. The jack 14 and the support plate 15 are used to support the core mold segment 3 to the specified height and make the core mold segment 3 coaxial with the straight tube blank 10. The overhead crane 2 is an 80T bridge crane. The lower end of the boom 21 of the overhead crane 2 is equipped with a hook. The core mold section 3 and its components are all connected to the hook via a rope structure for lifting operations. Finally, the boom 21 of the overhead crane 2 moves to the side of the fixed pulley 17 away from the core mold section 3. The wire rope 16 on the boom 21 passes through the groove on the lower side of the fixed pulley 17 and is bolted to the lifting lug holes on both sides of the jacking tool 35. The axis of the fixed pulley 17 is arranged along the horizontal radial direction of the straight tube blank 10. The wire rope 16 located below the fixed pulley 17 is parallel to the centerline of the straight tube blank 10. By setting the fixed pulley 17, the lifting motion of the boom 21 is converted into the movement of the wire rope 16. The horizontal movement of 6 causes the boom 21 to pull the wire rope 16, which in turn pulls the core mold section 3 into the straight tube blank 10. After the core mold section 3 enters the straight tube blank 10, the wire rope 16 needs to be removed from the top-loading fixture 35 and the top-loading fixture 35 needs to be removed from the core mold section 3. The boom 21 of the crane 2 then moves to its original position to lift the upper mold core 31, lower mold core 32, wedge 33 and other components to assist the manual assembly of other core mold sections 3 and begin the assembly of the next core mold section 3.

[0006] The above method for assembling multiple core mold segments 3 into the straight tube blank 10 is cumbersome, labor-intensive, and inefficient. The specific reasons are as follows:

[0007] 1. The above-mentioned overhead crane 2 is an 80T bridge crane, whose lifting speed is generally no more than 9m / min. The speed is relatively slow, which seriously restricts the hoisting efficiency of the upper mold core 31, lower mold core 32, wedge 33 and core mold section 3, and affects the assembly efficiency.

[0008] 2. When lifting the upper mold core 31, lower mold core 32, wedge 33 and core mold section 3, etc., the lifting objects are connected to the hook of the lifting arm 21 by ropes. During this process, the operators need to constantly adjust the ropes, which is cumbersome, wastes manpower and reduces lifting efficiency.

[0009] 3. After hoisting a single core mold segment 3 onto the support plate 15 of the jack 14, the boom 21 of the overhead crane 2 needs to move from the support plate 15 to the side of the fixed pulley 17 away from the core mold segment 3, so that the wire rope 16 on it passes under the fixed pulley 17 and is connected to the lifting lug hole of the jacking tool 35. After the boom 21 of the overhead crane 2 pulls the core mold segment 3 on the support plate 15 into the straight tube blank 10, the transfer and assembly of the upper mold core 31, lower mold core 32, and wedge 33, the hoisting of the core mold segment 3, and the installation of the core mold segment 3 into the straight tube blank 10 are all completed by the same overhead crane 2. The assembly and hoisting of another core mold segment 3 can only begin after the previous core mold segment 3 has been installed into the straight tube blank 10, resulting in low production efficiency.

[0010] 4. The crane 2 frequently switches between two working modes: lifting heavy objects and traction of the core module section in the horizontal direction. This requires frequent manual disassembly and assembly of the wire rope 16 and the jacking tool 35, resulting in high labor intensity for the operators.

[0011] 5. The crane 2 frequently switches between two working modes: lifting heavy objects and traction of the core module section in the horizontal direction. The force direction of the boom 21 changes constantly, which can easily lead to safety accidents.

[0012] 6. Since the horizontal positioning block 13 is a whole plate structure welded to the rigid plate 11, the width of the V-shaped positioning groove 131 on it is a fixed value, which can only be used to support straight pipe blanks 10 with smaller outer diameters, and its applicable range is small. Utility Model Content

[0013] The technical problem to be solved by this utility model is to provide an auxiliary device for assembling the core mold of nuclear power wave tubes, thereby reducing the labor intensity of operators, improving the assembly and assembly efficiency of the core mold segment, and increasing the production efficiency of nuclear power wave tubes.

[0014] The technical solution adopted by this utility model to solve the technical problem is: an auxiliary device for assembling the core mold of a nuclear power wave tube, including a trolley and a baffle. The trolley is equipped with a boom for lifting the workpiece. It also includes a frame located below the boom. The top of the frame is provided with a tube blank support, a core mold support and a telescopic push rod arranged sequentially from back to front. The baffle is located on the side of the tube blank support away from the core mold support. The front-back direction is defined as the first horizontal direction, and the horizontal direction perpendicular to the first horizontal direction is defined as the second horizontal direction.

[0015] The billet support includes two billet limiting blocks, which are spaced apart along a second horizontal direction and have a billet limiting space between them; the core mold support includes two core mold limiting blocks, which are spaced apart along a second horizontal direction and have a core mold limiting space between them; the height of the core mold limiting blocks is adjustable; the center line of the core mold limiting space and the center line of the billet limiting space are both arranged along the first horizontal direction and their projections on the horizontal plane coincide;

[0016] The axis of the telescopic push rod is arranged along the first horizontal direction. The end of the telescopic push rod near the core mold support is the telescopic end. The telescopic end of the telescopic push rod can reciprocate linearly along the first horizontal direction to enter and exit the core mold limiting space.

[0017] Furthermore, the overhead crane is a gantry crane; the lower end of the boom is equipped with a magnetic lifting device, which is an electromagnetic lifting device.

[0018] Furthermore, the bottom surface of the magnetic lifting device is a concave arc surface structure, the cross-section of the arc surface structure is an arc structure with the opening facing downwards, and the radius of the arc structure is equal to the radius of the core mold segment.

[0019] Furthermore, the frame has a vertically extending mounting groove, and the baffle has a strip-shaped through hole with its length arranged in the vertical direction. A fastening bolt is provided in the strip-shaped through hole, and the baffle is located in the mounting groove and is fixedly installed on the side wall of the mounting groove by the fastening bolt in the strip-shaped through hole.

[0020] Furthermore, the top surface of the billet limiting block is a billet support surface, which is a plane that is inclined upward from the side close to the billet limiting space to the side away from the billet limiting space.

[0021] Furthermore, the tube blank support is provided in multiple sets, and the multiple sets of tube blank supports are evenly distributed along the front-back direction; two sets of tube blank supports that are close to each other are arranged at intervals.

[0022] The lower end of the billet limiting block has an adapter plate, which is bolted to the frame.

[0023] Furthermore, the top surface of the core mold limiting block is a core mold support surface, which is an inclined surface arranged from the side close to the core mold limiting space to the side away from the core mold limiting space.

[0024] Furthermore, the core mold support also includes a bracket fixedly installed on the frame and an adjusting bolt provided on the bracket; the top surface of the bracket is a plane that is inclined upward from the side close to the core mold limiting space to the side away from the core mold limiting space, and the top surface of the bracket is provided with a threaded through hole with an axis perpendicular to the top surface of the bracket, and the adjusting bolt is threadedly connected to the threaded through hole on the bracket.

[0025] The core mold limiting block is fixedly mounted on the adjusting bolt.

[0026] Furthermore, the telescopic push rod and the center line of the core mold limiting space are arranged coaxially on the horizontal plane.

[0027] Furthermore, the telescopic push rod is a hydraulic cylinder, which includes a cylinder body fixedly mounted on the frame and a piston rod disposed within the cylinder body. The piston rod is capable of axial extension and retraction relative to the cylinder body.

[0028] The piston rod is arranged along the first horizontal direction, and the end of it away from the cylinder body is the telescopic end of the telescopic push rod.

[0029] Compared with existing technologies, the beneficial effects of this utility model are as follows: It provides an auxiliary device for assembling core molds for nuclear power plant wave tubes. By setting a telescopic push rod to replace the original combination structure of trolley, fixed pulley, and wire rope, the core mold segments are pushed into the straight tube blank in sequence. During this process, the trolley can lift and assemble the base layer of structures such as upper mold cores, lower mold cores, and wedges used to form other core mold segments. This allows the operation of installing the previous core mold segment into the straight tube blank and the integration and assembly operation of the upper mold core, lower mold core, and wedges of the next core mold segment to be carried out simultaneously. This eliminates the frequent loading and unloading operations between the upper end of the wire rope wound on the fixed pulley and the boom, improving the efficiency of core mold assembly loading into the straight tube blank and saving manpower. In addition, there is no need to frequently change the force direction of the trolley boom, making it safer and more reliable. By setting the trolley as a gantry crane, the lifting efficiency is improved; by setting a magnetic lifting device at the lower end of the boom to lift heavy objects by magnetic attraction, the operation process of frequently loading and unloading heavy objects by operators is eliminated, saving manpower and improving lifting efficiency. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of an auxiliary device for assembling existing core mold segments in the background art;

[0031] Figure 2 This is a diagram showing the fit between the straight tube blank and the horizontal positioning block in the background technology.

[0032] Figure 3 This is a schematic diagram of the main structure of this utility model;

[0033] Figure 4This is a top view of the structure of this utility model;

[0034] Figure 5 This utility model is based on Figure 3 A schematic diagram of the cross-sectional structure along the AA direction of the mid-section line of sight;

[0035] Figure 6 This utility model is based on Figure 3 Schematic diagram of the cross-sectional structure along the BB direction of the mid-section;

[0036] Figure 7 This utility model is based on Figure 3 A schematic diagram of the cross-sectional structure along the CC direction of the mid-section line of sight;

[0037] Figure 8 This utility model is based on Figure 3 Schematic diagram of the cross-sectional structure along the DD direction of the mid-section line of sight;

[0038] Reference numerals: 10-Straight pipe blank; 11-Steel plate; 12-Baffle; 13-Horizontal positioning block; 131-V-shaped positioning groove; 14-Jack; 15-Support plate; 16-Wire rope; 17-Fixed pulley; 2-Helicopter; 21-Boom; 22-Magnetic lifting device; 3-Core mold section; 31-Upper mold core; 32-Lower mold core; 33-Wedge; 34-Guide rod; 35-Ejection tooling ; 4-Frame; 41-Mounting slot; 42-Strip through hole; 5-Blank support; 50-Blank limiting space; 51-Blank limiting block; 52-Blank support surface; 53-Adapter plate; 6-Core mold support; 60-Core mold limiting space; 61-Core mold limiting block; 62-Core mold support surface; 63-Bracket; 64-Adjusting bolt; 7-Telescopic push rod; 71-Cylinder body; 72-Piston rod. Detailed Implementation

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0040] As attached Figure 2-8As shown, an auxiliary device for assembling a core mold for a nuclear power plant's wave tube includes a trolley 2 and a baffle 12. The trolley 2 is equipped with a boom 21 for lifting workpieces. It also includes a frame 4 located below the boom 21. The top of the frame 4 is provided with a tube blank support 5, a core mold support 6, and a telescopic push rod 7 arranged sequentially from back to front. The baffle 12 is located on the side of the tube blank support 5 away from the core mold support 6. The front-back direction is defined as the first horizontal direction, and the horizontal direction perpendicular to the first horizontal direction is defined as the second horizontal direction. The tube blank support 5 includes two tube blank limiting blocks 51, which are spaced apart along the second horizontal direction and are separated by a certain distance. The tube blank limiting space 50 is provided; the core mold support 6 includes two core mold limiting blocks 61, which are arranged at intervals along a second horizontal direction and have a core mold limiting space 60 between them; the height of the core mold limiting blocks 61 is adjustable; the center line of the core mold limiting space 60 and the center line of the tube blank limiting space 50 are both arranged along the first horizontal direction and their projections on the horizontal plane coincide; the axis of the telescopic push rod 7 is arranged along the first horizontal direction, and the end of the telescopic push rod 7 near the core mold support 6 is the telescopic end, which can reciprocate linearly in and out of the core mold limiting space 60 along the first horizontal direction. The first horizontal direction is... Figure 3 The X direction in the middle, the second horizontal direction is Figure 3 in the Y direction.

[0041] When assembling the core mold assembly using the auxiliary device described in this utility model, the straight tube blank 10 is located in the tube blank limiting space 50 between the two tube blank limiting blocks 51. The two tube blank limiting blocks 51 cooperate with each other to position the straight tube blank 10 in the horizontal radial direction. The baffle 12 is located on the side of the straight tube blank 10 away from the core mold support 6 and abuts against the end face of the straight tube blank 10. The baffle 12 limits the straight tube blank 10 axially. The boom 21 of the crane 2 hoists and assembles the upper mold core 31, the lower mold core 32 and the wedge 33 one by one to form the core mold section 3. Then the boom 21 hoists the core mold section 3 into the core mold limiting space 60 between the two core mold limiting blocks 61. The two core mold limiting blocks 61 cooperate with each other to support the core mold section 3 upward and position the core mold section 3 in the horizontal radial direction. At this time, the core mold section 3 and the straight pipe blank 10 are coaxial. The telescopic end of the telescopic push rod 7 is located outside the core mold limiting space 60 and is arranged at intervals with the core mold section 3 in the horizontal direction. Subsequently, the boom 21 of the crane 2 resets and hoists the upper mold core 31, lower mold core 32, and wedge 33, assembling them into the next core mold segment 3 via the guide rod 34. Simultaneously, the telescopic end of the telescopic push rod 7 moves along the first horizontal direction towards the core mold segment 3, pushing it into the straight pipe blank 10. After the telescopic push rod 15 resets, the boom 21 hoists the assembled next core mold segment 3 into the core mold limiting space 60. The telescopic push rod 15 continues to push the next core mold segment 3 into the straight pipe blank 10, and so on, until the multiple core mold segments 3 constituting the core mold assembly are assembled sequentially. During this process, the height of the core mold limiting block 61 is adjusted to ensure that the core mold segment 3 and the straight pipe blank 10 are coaxial.

[0042] This invention replaces the original combination of trolley 2, fixed pulley 17, and wire rope 16 with a telescopic push rod 7 to sequentially push the core mold segment 3 into the straight tube blank 10. During this process, the trolley 2 can also hoist and assemble the base layer for other core mold segments 3, such as the upper mold core 31, lower mold core 32, and wedges 33. This allows the installation of the previous core mold segment 3 into the straight tube blank 10 and the integration assembly of the upper mold core 31, lower mold core 32, and wedges 33 of the next core mold segment 3 to be carried out simultaneously. This eliminates the frequent disassembly and reassembly of the upper end of the wire rope 16 wound on the fixed pulley 17 to the boom, improving the efficiency of installing the core mold assembly into the straight tube blank 10 and saving manpower. In addition, there is no need to frequently change the force direction of the boom 21 of the trolley 2, making it safer and more reliable.

[0043] The overhead crane 2 is used for hoisting the core mold section 3 and its components such as the upper mold core 31, lower mold core 32, and wedges 33. The overhead crane can be an existing bridge crane, gantry crane, or other lifting equipment. Preferably, the overhead crane 2 is a gantry crane. Compared with the bridge crane in the prior art, the gantry crane generally has a running speed of 20m / min, which is faster and improves the hoisting efficiency of the core mold section 3 and its components.

[0044] The lifting device at the lower end of the boom 21 of the crane 2 typically uses a hook structure. The object to be lifted is hooked onto the hook of the boom 21 via a lifting ring or wire rope. This method requires operators to frequently install and remove the lifting ring or wire rope, wasting manpower. As a further preferred embodiment, the lower end of the boom 21 is equipped with a magnetic lifting device 22, which is an electromagnetic lifting device. The magnetic lifting device 22 uses its own strong magnetic field to attract and lift heavy objects. By controlling the magnetic force of the magnetic lifting device 22, the loading and unloading of the object can be achieved, reducing the labor intensity of the operators and further improving the lifting efficiency. In this invention, the core mold segment 3 and the upper mold core 31, lower mold core 32, and wedge 33, etc., which need to be lifted, are all made of ferromagnetic materials and can all be attracted by the magnetic lifting device 22. The attraction force of the magnetic lifting device 22 on the above-mentioned components is greater than the weight of these components themselves.

[0045] The bottom surface of the magnetic lifting device 22 can be either a planar structure or a curved structure. As a further preferred embodiment, the bottom surface of the magnetic lifting device 22 is a concave arc surface structure, the cross-section of which is an arc structure with its opening facing downwards, and the radius of the arc structure is equal to the radius of the core mold segment 3. When lifting the core mold segment 3, the outer wall of the core mold segment 3 is completely in contact with the bottom surface of the magnetic lifting device 22, increasing the adsorption area of ​​the core mold segment 3 and improving the safety and reliability of lifting the core mold segment 3.

[0046] The frame 4 is mainly used to integrate and assemble the telescopic push rod 7, the core mold support 6, the billet support 5, and the baffle 12 into a single structure. The support 4 can be a structure welded from one or more steel materials such as steel pipes, I-beams, channel steel, and steel plates. Preferably, the support 4 is a frame structure welded from multiple steel pipes with rectangular cross-sectional outlines. Any mounting surface on the support 4 of this structure is a plane, which facilitates the assembly of other structures.

[0047] As a further preferred option, the top surface of the frame 4 is 800mm above the ground. This height meets the height requirements of the operators. When assembling and adjusting components such as the baffle 12, billet support 5, and core mold support 6 on it, the operators can avoid bending their knees, reduce the bending range of the operators, and reduce the labor intensity of the operators.

[0048] The baffle 12 is used to limit the straight tube blank 10 in its axial direction, preventing the mandrel section 3 from pushing the straight tube blank 10 in the same direction when the telescopic push rod 7 pushes the mandrel section 3 into the straight tube blank 10. The baffle 12 can be installed on the frame 4 by welding or bolt connection. Preferably, the frame 4 has a vertically penetrating mounting groove 41, and the baffle 12 has a strip-shaped through hole 42 with its length arranged in the vertical direction. The strip-shaped through hole 42 is provided with a fastening bolt. The baffle 12 is located in the mounting groove 41 and is fixedly installed on the side wall of the mounting groove 41 by the fastening bolt in the strip-shaped through hole 42. The fastening bolt is threaded to the side wall of the mounting groove 41. By providing a strip-shaped hole on the baffle 12, the position of the entire frame 4 in the vertical direction can be adjusted, so that the same baffle 12 can be used to limit the axial movement of straight tube blanks 10 with different support heights and different outer diameters.

[0049] The tube blank support 5 supports the straight tube blank 10. Two tube blank limiting blocks 51 cooperate to position the straight tube blank 10 in the second horizontal direction. The tube blank limiting space 50 is used to accommodate the straight tube blank 10. The tube blank limiting block 51 can be a strip-shaped structure or a plate-shaped structure, and it can be in surface contact or line contact with the core mold section 3. Preferably, the top surface of the tube blank limiting block 51 is the tube blank support surface 52, which is a plane that is inclined upward from the side closer to the tube blank limiting space 50 to the side farther away from the tube blank limiting space 50. The tube blank support surfaces 52 on the two tube blank limiting blocks 51 cooperate to form a V-shaped groove structure to support and position the straight tube blank 10. The width of the tube blank limiting space 50 gradually widens from bottom to top, so that the tube blank support 5 can be used to support straight tube blanks 10 with different outer diameters.

[0050] The tube blank support 5 can be provided in one set or multiple sets. Preferably, multiple sets of tube blank supports 5 are provided, and the multiple sets of tube blank supports 5 are evenly distributed in the front-back direction. Two sets of tube blank supports 5 that are close to each other are arranged at intervals, which improves the support stability of the straight tube blank 10 and saves the raw materials for producing the tube blank supports 5.

[0051] The billet limiting block 51 can be welded to the frame 4, or it can be connected to the frame 4 by bolts, pins, or other structures. Preferably, the lower end of the billet limiting block 51 has an adapter plate 53, which is bolted to the frame 4. The installation position of the billet limiting block 51 on the frame 4 can be adjusted at any time, thereby adjusting the distance between the two billet limiting blocks 51 and the width of the V-shaped groove formed by the cooperation of the two billet support surfaces 52, thus enabling the support and horizontal radial positioning of straight billet 10 with different lengths and outer diameters.

[0052] The core mold support 6 supports the core mold segment 3. The two blank limiting blocks 51 cooperate to not only position the core mold segment 3 in the second horizontal direction, but also to ensure that the core mold segment 3 moves axially under the thrust of the telescopic push rod 5. The core mold limiting space 60 is used to accommodate the core mold segment 3. The core mold limiting block 61 and the core mold segment 3 can be in surface contact or line contact. Preferably, the top surface of the core mold limiting block 61 is the core mold support surface 62, which is an inclined surface that slopes upward from the side closer to the core mold limiting space 60 to the side farther away from the core mold limiting space 60. The core mold support surfaces 62 on the two core mold limiting blocks 61 cooperate to form a V-shaped groove structure whose width gradually increases from bottom to top, so that the core mold support 6 can be used to support core mold segments 3 with different outer diameters.

[0053] The core mold limiting block 61 can be welded to the frame 4, or it can be connected to the frame 4 by bolts, pins, or other structures. Preferably, the lower end of the core mold limiting block 61 is fixedly connected to the frame 4 by bolts, allowing the installation position of the core mold limiting block 61 on the frame 4 to be adjusted at any time, thereby adjusting the distance between the two core mold limiting blocks 61 and the width of the V-shaped groove formed by the cooperation of the two core mold support surfaces 62, thus enabling the support and positioning of core mold segments 3 of different lengths and outer diameters along the horizontal radial direction.

[0054] The height of the core mold limiting block 61 can be adjusted using height adjustment structures such as jacks and hydraulic telescopic rods mounted on the frame 4. The top of the height adjustment structure is a lifting end, and the core mold limiting block 61 is mounted on the lifting end of the height adjustment structure. Preferably, the core mold support 6 further includes a bracket 63 fixedly mounted on the frame 4 and an adjusting bolt 64 mounted on the bracket 63. The top surface of the bracket 63 is a plane that slopes upward from the side closer to the core mold limiting space 60 to the side farther away from the core mold limiting space 60. The top surface of the bracket 63 has a threaded through hole with its axis perpendicular to the top surface of the bracket 63. The adjusting bolt 64 is threaded into the threaded through hole on the bracket 63. The core mold limiting block 61 is fixedly mounted on the adjusting bolt 64. By rotating the adjusting bolt 64, the position and height of the top of the adjusting bolt 64 in the second horizontal direction can be adjusted simultaneously. This causes the adjusting bolt 64 to drive the core mold limiting block 61 to move synchronously, thus achieving simultaneous adjustment of the position and height of the core mold limiting block 61 in the second horizontal direction. The structure is simple and has a lower cost compared to height adjustment structures such as jacks and hydraulic telescopic rods, saving production costs.

[0055] The telescopic push rod 7 is used to push the mandrel segment 3 along its axial direction into the straight tube blank 10. When the telescopic push rod 7 pushes the mandrel segment 3, it can abut at any position on the end face of the mandrel segment 3. Preferably, the telescopic push rod 7 and the center line of the mandrel limiting space 60 are arranged coaxially on the horizontal plane to improve the uniformity of force on the mandrel segment 3.

[0056] The telescopic push rod 7 can be an electric push rod, a pneumatic push rod, or a hydraulic push rod, etc. Because the friction between the core mold segment 3 and the core mold support 6 is relatively large, preferably, the telescopic push rod 7 is a hydraulic cylinder. The hydraulic cylinder includes a cylinder body 71 fixedly mounted on the frame 4 and a piston rod 72 disposed within the cylinder body 71. The piston rod 72 can move axially and telescopically relative to the cylinder body 71. The end of the piston rod 72 arranged along the first horizontal direction and located away from the cylinder body 71 is the telescopic end of the telescopic push rod 7. Compared to pneumatic and electric push rods, hydraulic cylinders have greater output force and more stable speed.

[0057] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. An auxiliary device for assembling a core mold for a nuclear power plant wave tube, comprising a trolley (2) and a baffle (12), wherein the trolley (2) is provided with a boom (21) for lifting the workpiece; characterized in that: It also includes a frame (4) located below the boom (21), and the top of the frame (4) is provided with a billet support (5), a core mold support (6) and a telescopic push rod (7) arranged sequentially from back to front. The baffle (12) is located on the side of the billet support (5) away from the core mold support (6); the front-back direction is defined as the first horizontal direction, and the horizontal direction perpendicular to the first horizontal direction is defined as the second horizontal direction; The billet support (5) includes two billet limiting blocks (51), which are spaced apart along the second horizontal direction and have a billet limiting space (50) between them; the core mold support (6) includes two core mold limiting blocks (61), which are spaced apart along the second horizontal direction and have a core mold limiting space (60) between them; the height of the core mold limiting blocks (61) is adjustable; the center line of the core mold limiting space (60) and the center line of the billet limiting space (50) are both arranged along the first horizontal direction and their projections on the horizontal plane coincide; The axis of the telescopic push rod (7) is arranged along the first horizontal direction. The end of the telescopic push rod (7) near the core mold support (6) is the telescopic end. The telescopic end of the telescopic push rod (7) can move in and out of the core mold limiting space (60) in a straight line along the first horizontal direction.

2. The auxiliary device for assembling nuclear power plant wave tube core molds according to claim 1, characterized in that: The overhead crane (2) is a gantry crane; the lower end of the boom (21) is provided with a magnetic lifting device (22), which is an electromagnetic lifting device.

3. The auxiliary device for assembling nuclear power plant wave tube core molds according to claim 2, characterized in that: The bottom surface of the magnetic lifting device (22) is a concave arc surface structure, and the cross-section of the arc surface structure is an arc structure with the opening facing downward. The radius of the arc structure is equal to the radius of the core mold section (3).

4. The auxiliary device for assembling nuclear power plant wave tube core molds according to claim 1, characterized in that: The frame (4) has a vertically penetrating mounting groove (41), and the baffle (12) has a strip-shaped through hole (42) with its length arranged in the vertical direction. The strip-shaped through hole (42) is provided with a fastening bolt. The baffle (12) is located in the mounting groove (41) and is fixedly installed on the side wall of the mounting groove (41) by the fastening bolt in the strip-shaped through hole (42).

5. The auxiliary device for assembling nuclear power plant wave tube core molds according to claim 1, characterized in that: The top surface of the tube blank limiting block (51) is the tube blank support surface (52), which is a plane that is inclined upward from the side close to the tube blank limiting space (50) to the side away from the tube blank limiting space (50).

6. The auxiliary device for assembling nuclear power plant wave tube core molds according to claim 5, characterized in that: The tube blank support (5) is provided in multiple sets, and the multiple sets of tube blank support (5) are evenly distributed along the front-back direction; two sets of tube blank support (5) that are close to each other are arranged at intervals; The lower end of the billet limiting block (51) has an adapter plate (53), which is bolted to the frame (4).

7. The auxiliary device for assembling nuclear power plant wave tube core molds according to claim 1, characterized in that: The top surface of the core mold limiting block (61) is the core mold support surface (62), which is an inclined surface arranged from the side close to the core mold limiting space (60) to the side away from the core mold limiting space (60).

8. The auxiliary device for assembling nuclear power plant wave tube core molds according to claim 7, characterized in that: The core mold support (6) further includes a bracket (63) fixedly installed on the frame (4) and an adjusting bolt (64) provided on the bracket (63); the top surface of the bracket (63) is a plane that is inclined upward from the side close to the core mold limiting space (60) to the side away from the core mold limiting space (60), and the top surface of the bracket (63) is provided with a threaded through hole with the axis perpendicular to the top surface of the bracket (63), and the adjusting bolt (64) is threadedly connected to the threaded through hole on the bracket (63); The core mold limiting block (61) is fixedly mounted on the adjusting bolt (64).

9. The auxiliary device for assembling a nuclear power plant wave tube core mold according to any one of claims 1-8, characterized in that: The telescopic push rod (7) and the center line of the core mold limiting space (60) are arranged coaxially on the horizontal plane.

10. The auxiliary device for assembling nuclear power plant wave tube core molds according to claim 9, characterized in that: The telescopic push rod (7) is a hydraulic cylinder, which includes a cylinder body (71) fixedly mounted on the frame (4) and a piston rod (72) mounted inside the cylinder body (71). The piston rod (72) can move axially relative to the cylinder body (71). The piston rod (72) is arranged along the first horizontal direction, and one end of it away from the cylinder (71) is the telescopic end of the telescopic push rod (7).

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