A riveting tool for twin blades of T-shaped outer package leaf root

Abstract

The application relates to the field of steam turbine blade processing technology, in particular to a T-shaped outer package twin blade riveting tool, which comprises a twin blade, a surrounding band, a limiting seat and two groups of fixing assemblies; the limiting seat is fixedly arranged on a work platform, a limiting groove is arranged on the limiting seat, the twin blade is clamped in the limiting groove, the two groups of fixing assemblies are fixedly and detachably connected with the two side walls of the limiting seat, and the fixing assembly is used for fixing the position of the twin blade in the limiting groove; the surrounding band is riveted with the twin blade; the riveting tool is arranged, the twin blade is separately riveted with the surrounding band, the twin blade is loaded into the main shaft after riveting, force exerted on the twin blade during riveting is avoided, the twin blade and the main shaft are prevented from being locked, the main shaft is prevented from being deformed, and the riveting quality of the twin blade is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the field of steam turbine blade processing, in particular to a T-shaped outer-enclosed blade root twin blade riveting tool. BACKGROUND

[0002] Steam turbines are important equipment for converting the heat energy of steam into mechanical energy, and are widely used in thermal power generation, nuclear power and other fields. As the core component for realizing energy conversion in steam turbines, the performance of blades directly affects the efficiency, reliability and economy of steam turbines. A blade is usually composed of a blade body, a blade root and a blade tip. The blade body is the working part of the blade, and the adjacent blade bodies form an airflow channel. When steam flows through the airflow channel, kinetic energy is converted into mechanical energy. The blade is fixedly connected to the main shaft through the blade root. The blade tip refers to the top of the blade. Multiple blades are usually connected together at the blade tip by a shroud to form a blade group.

[0003] With the increasing demand for energy and the increasing demand for energy utilization efficiency, steam turbines need to continuously improve their performance, which requires blades to be able to operate stably at higher temperatures, pressures and rotational speeds, while having higher strength, better aerodynamic performance and longer service life, thereby promoting the continuous development and innovation of steam turbine blade technology. Twin blade technology is one of them. Twin blades refer to two blade bodies designed to be closely connected. They share a blade root or have a special connecting structure near the blade root. This unique structure allows the two blade bodies to work together, influence and support each other.

[0004] When assembling twin blades, after the blade root is installed from the main shaft lock, the shroud needs to be riveted on the blade tip. During riveting, on the one hand, the impact force is relatively large when the hammer strikes the blade tip, causing the blade and the main shaft to be locked, and in severe cases, the blade or the main shaft is deformed. On the other hand, due to the high installation height of the main shaft, after each blade is riveted, the main shaft needs to be rotated so that the next blade can be riveted in the appropriate position, making the riveting process inconvenient and the quality of the twin blade riveting cannot be guaranteed. SUMMARY

[0005] In order to improve the quality of twin blade riveting, the application provides a T-shaped outer-enclosed blade root twin blade riveting tool.

[0006] The T-shaped outer-enclosed blade root twin blade riveting tool provided by the application adopts the following technical scheme:

[0007] The riveting tool for the outer package T-shaped blade root twin blade comprises a twin blade, a surrounding band, a limiting seat and two groups of fixing assemblies; the limiting seat is fixedly arranged on a working platform, a limiting groove is arranged on the limiting seat, the twin blade is clamped in the limiting groove, two groups of the fixing assemblies are fixedly and detachably connected with the two side walls of the limiting seat, and the fixing assemblies are used for fixing the position of the twin blade in the limiting groove; and the surrounding band is riveted with the twin blade.

[0008] By adopting the above technical scheme, when the twin blade is riveted, the limiting seat is first fixedly arranged on the working platform, then the twin blade is clamped in the limiting groove, the fixing assemblies are arranged on the two side walls of the limiting seat, the fixing assemblies are used for limiting and fixing the twin blade, the position of the twin blade in the limiting groove is fixed, finally, the surrounding band is riveted on the twin blade by the operator. The riveting tool is arranged, the twin blade is riveted with the surrounding band, and after the riveting is completed, the twin blade is arranged in the main shaft, so that the force applied to the twin blade during riveting is avoided to cause the twin blade to be locked with the main shaft, the deformation of the main shaft is avoided, and the riveting quality of the twin blade is improved.

[0009] In a specific embodiment, the twin blade comprises a blade root and two blade bodies arranged on the blade root; the blade root is used for fixedly connecting with a main shaft, the blade root comprises an integrally arranged root top, a root neck and a root bottom, the root top is used for arranging the blade bodies, the root neck is connected with the root top and the root bottom at two ends in the height direction respectively, the root top and the root neck are in T-shaped cross section, and the root bottom is symmetrically arranged about the root neck; the two end faces of the root top, the root neck and the root bottom in the length direction are flush;

[0010] The bottom of the two blade bodies is fixedly connected with the top wall of the root top, the two blade bodies are evenly arranged along the length direction of the root top, and the two blade bodies are parallel to each other, and the horizontal cross section of the blade body is in a crescent shape;

[0011] The top of the blade body is provided with a riveting head, and the riveting head is riveted and fixed with the surrounding band.

[0012] By adopting the technical scheme, the twin blades are arranged, the bottom of the blade body is fixedly connected with the root top, the top of the blade body is provided with a riveting head, the riveting head is riveted with the shroud, the mutual connection between the two blade bodies is realized, the deformation of the blade caused by the large centrifugal force of the blade when the steam turbine has a high rotating speed or the blade has a high height is avoided, the horizontal section of the blade body is arranged in a crescent shape, the flow of the steam in the flow channel formed between the adjacent two blade bodies can be smoother, the separation of the airflow and the generation of the vortex are reduced, meanwhile, the stress distribution in the blade body is more uniform due to the crescent-shaped section, the fatigue cracks of the blade body caused by the stress concentration are avoided, and the possibility of the rupture of the blade body is reduced.

[0013] In a specific implementation, the root top is provided with a weight-reducing groove at each end in the width direction, the opening of the weight-reducing groove faces downward, and the two weight-reducing grooves are symmetrically arranged about the root top in the width direction, and the extension direction of the weight-reducing groove is parallel to the length direction of the root top.

[0014] By adopting the technical scheme, the weight-reducing groove is arranged, the weight of the blade root is reduced, the centrifugal force borne by the twin blade when the steam turbine has a high rotating speed is reduced, the stress of the blade root is reduced, the safety and reliability of the twin blade are improved, and the service life of the twin blade is improved.

[0015] In a specific implementation, the shroud is provided with a plurality of riveting holes, the diameter of the riveting hole is slightly larger than the diameter of the riveting head, and the spacing between the adjacent two riveting holes is equal to the spacing between the two riveting heads.

[0016] By adopting the technical scheme, the shroud is placed on the top of the blade body, the riveting head passes through the riveting hole arranged on the shroud, and then the riveting head is forced to deform to tightly fill the gap between the riveting hole and the riveting head; the spacing between the adjacent two riveting holes is equal to the spacing between the two riveting heads, the two riveting heads are riveted in the adjacent two riveting holes on the shroud, respectively, the two blade bodies are connected as a whole, and the deformation of the blade caused by the large centrifugal force of the blade when the steam turbine has a high rotating speed or the blade has a high height is avoided.

[0017] In a specific implementation, the limiting seat comprises an integral mounting portion and a limiting portion, the mounting portion is flush with the bottom of the limiting portion, two mounting portions are respectively located at both ends of the limiting portion in the horizontal direction, and the two mounting portions are symmetrically arranged about the limiting portion.

[0018] The limiting groove is arranged on the top wall of the limiting part and penetrates through the two side walls of the limiting part along the length direction, the root bottom and the root neck are arranged in the limiting groove in a clamping manner, and the inner contour of the limiting groove is matched with the length direction two side contours of the root neck and the root bottom.

[0019] By adopting the above technical scheme, the limiting seat is arranged, the root bottom and the root neck are clamped in the limiting groove, the inner contour of the limiting groove is matched with the length direction two side contours of the root neck and the root bottom, the position of the limiting seat in the limiting groove along the width direction is fixed, and then the shaking and deviation of the blade root during riveting of the twin blade are avoided, and the riveting quality of the twin blade is affected.

[0020] In a specific implementable scheme, the length of the limiting groove is the same as the length of the root neck.

[0021] By adopting the above technical scheme, the length of the limiting groove is the same as the length of the root neck, the root neck and the root bottom are completely clamped in the limiting groove, the limiting and fixing effect of the blade root is enhanced, and the riveting quality of the twin blade is improved.

[0022] In a specific implementable scheme, the top of each of the two mounting parts is provided with a mounting hole, and the mounting hole penetrates through the mounting part along the vertical direction.

[0023] By adopting the above technical scheme, the mounting hole is arranged, the limiting seat is placed on the workbench during riveting of the twin blade, the bolt is used to threadedly connect the mounting hole and the workbench, the position of the limiting seat on the workbench is fixed, the position movement of the limiting seat during riveting is avoided, and the riveting effect of the twin blade is affected.

[0024] In a specific implementable scheme, two limiting bolt holes are respectively arranged in the two side walls of the limiting part, the two limiting bolt holes are respectively located on the two sides of the length direction of the limiting groove, the extension direction of the limiting bolt hole is parallel to the length direction of the limiting groove, and the fixing assembly is fixedly connected with the limiting part through the limiting bolt hole.

[0025] By adopting the above technical scheme, the limiting bolt hole provides a mounting basis for the fixing assembly, the limiting and fixing of the blade root by the fixing assembly is facilitated, the position movement of the blade root during riveting of the twin blade is avoided, and the stability of riveting is improved.

[0026] In a specific implementable scheme, the fixing assembly includes a fixing plate and two fixing bolts, two fixing holes are arranged in the two ends of the fixing plate along the length direction, the distance between the two fixing holes is the same as the distance between the two limiting bolt holes, and the fixing bolt is threadedly connected with the limiting bolt hole after penetrating through the fixing hole.

[0027] The sidewall of the fixing plate is in contact with the sidewall of the limiting part and the end face of the root neck in the length direction.

[0028] By adopting the above technical solution and setting the fixing components, adjusting the root bottom and root neck, so that the blade root is engaged in the limiting groove, then the fixing plate is pressed against the side wall of the limiting part, the fixing hole corresponds to the position of the limiting bolt hole, and then the fixing bolt is adjusted so that the fixing bolt passes through the fixing hole and is threadedly connected to the limiting bolt hole. The two fixing plates are respectively fixed on both sides of the limiting part, so that the two ends of the blade root in the length direction are pressed between the two fixing plates, which avoids the blade root from moving along the length direction of the limiting groove when riveting the twin blades, thereby improving the stability of the twin blade riveting.

[0029] In one specific implementation scheme, the material of the limiting seat has a hardness greater than 300 HRC after heat treatment.

[0030] By adopting the above technical solution, the material of the limiting seat has a hardness greater than 300HRC after heat treatment, which helps to avoid deformation of the limiting seat caused by the impact force generated by hitting the rivet joint when riveting the twin blades, thereby improving the service life of the limiting seat.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. When riveting twin blades, first place the limiting seat on the work platform, and use bolts to thread them through the mounting holes to fix the limiting seat in position on the work platform. Adjust the root bottom and root neck so that the blade root is engaged in the limiting groove. Then, attach the fixing plate to the side wall of the limiting part, with the fixing holes corresponding to the limiting bolt holes. Adjust the fixing bolts so that the converging bolts pass through the fixing holes and are threaded into the limiting bolt holes. Fix the two fixing plates on both sides of the limiting part, so that the two ends of the blade root are pressed between the two fixing plates along its length. Finally, place the sheath on the top of the blade body, so that the riveting head passes through the riveting hole on the sheath. Apply force to the riveting head, so that the riveting head deforms and tightly fills the gap between the riveting hole and the riveting head. The riveting fixture is set up so that the twin blades are riveted to the sheath separately. After riveting, they are installed into the main shaft. This avoids applying force to the twin blades during riveting, which could cause the twin blades to seize up with the main shaft, thus avoiding deformation of the main shaft and improving the riveting quality of the twin blades.

[0033] 2. The fixed assembly is set up so that the fixing bolt passes through the fixing hole and is threaded to the limit bolt hole. The two fixing plates are fixed on both sides of the limit part, so that the two ends of the blade root in the length direction are pressed between the two fixing plates. This avoids the blade root from moving along the length direction of the limit groove when riveting the twin blades, thereby improving the stability of the twin blade riveting.

[0034] 3. The material of the limit seat is heat-treated to a hardness greater than 300HRC, which helps to avoid deformation of the limit seat caused by the impact force generated by the rivet joint when riveting the twin blades, thereby improving the service life of the limit seat. Attached Figure Description

[0035] The accompanying drawings are provided to further understand this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof.

[0036] Figure 1 This is a schematic diagram of the overall structure of a T-shaped blade root twin blade riveting fixture according to this application.

[0037] Figure 2 This is a schematic diagram of the twin blades and the surrounding belt structure of a twin blade riveting fixture for an external T-shaped blade root, as described in this application.

[0038] Figure 3 This is a schematic diagram of the limiting seat structure of a T-shaped blade root twin blade riveting fixture of this application.

[0039] Figure descriptions: 1. Twin blades; 11. Leaf root; 111. Root top; 1111. Weight reduction groove; 112. Root neck; 113. Root bottom; 12. Leaf body; 121. Rivet joint; 2. Enclosure; 21. Rivet hole; 3. Limiting seat; 31. Limiting groove; 32. Mounting part; 321. Mounting hole; 33. Limiting part; 331. Limiting bolt hole; 4. Fixing assembly; 41. Fixing plate; 42. Fixing bolt. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this application, unless otherwise stated, "multiple" means two or more.

[0042] The following is in conjunction with the appendix Figures 1-3 This application will be described in further detail.

[0043] This application discloses a riveting fixture for externally packaged T-shaped leaf root twin blades.

[0044] Reference Figure 1 A tooling for riveting twin blades with an outer T-shaped blade root includes twin blades 1, a sheath 2, a limiting seat 3, and two sets of fixing components 4. The limiting seat 3 is fixedly installed on a work platform and has a limiting groove 31. The twin blades 1 are engaged in the limiting groove 31. The two sets of fixing components 4 are fixedly and detachably connected to the two side walls of the limiting seat 3. The two ends of the twin blades 1 are located between the two sets of fixing components 4. The fixing components 4 are used to fix the position of the twin blades 1 in the limiting groove 31. The sheath 2 is riveted to the twin blades 1. When riveting the twin blades 1, the limiting seat 3 is first fixedly installed on the work platform. Then, the twin blades 1 are engaged in the limiting groove 31. The fixing components 4 are installed on the two side walls of the limiting seat 3. The fixing components 4 limit and fix the twin blades 1, so that the twin blades 1 are fixed in the limiting groove 31. Finally, the operator rivets the sheath 2 onto the twin blades 1. Meanwhile, the material of the limiting seat 3 is heat-treated to a hardness greater than 300 HRC, so as to avoid the stress of the twin blades 1 during riveting causing deformation of the limiting seat 3 and affecting the service life of the riveting fixture.

[0045] Reference Figure 2The twin blades 1 include a blade root 11 and two blade bodies 12 disposed on the blade root 11. When assembling the turbine, the blade root 11 is fixedly connected to the main shaft so that the blade bodies 12 can rotate synchronously with the main shaft. The blade root 11 includes an integrally disposed root top 111, root neck 112, and root bottom 113. The two ends of the root neck 112 along the height direction are respectively connected to the root top 111 and the root bottom 113. The cross-sections of the root top 111 and the root neck 112 are T-shaped. The root bottom 113 is symmetrically disposed about the root neck 112. The two end faces of the root top 111, root neck 112, and root bottom 113 in the length direction are flush. The root top 111 is provided with weight reduction grooves 1111 at both ends in the width direction. The openings of the weight reduction grooves 1111 are downward, and the two weight reduction grooves 1111 are symmetrically disposed about the width direction of the root top 111. The extension direction of the weight reduction grooves 1111 is parallel to the length direction of the root top 111. The bottom of two blades 12 are fixedly connected to the top wall of the root top 111. The two blades 12 are evenly arranged along the length of the root top 111 and are parallel to each other. The horizontal cross-section of the blade 12 is crescent-shaped. A rivet head 121 is provided at the top of the blade 12. Multiple rivet holes 21 are provided on the sheath 2. The diameter of the rivet holes 21 is slightly larger than the diameter of the rivet head 121. The length of the rivet head 121 is greater than the depth of the rivet hole 21. The distance between two adjacent rivet holes 21 is equal to the distance between two rivet heads 121. The rivet head 121 is riveted and fixed to the sheath 2. The head 121 is riveted to the shroud 2 to connect the two blades 12, avoiding blade deformation caused by large centrifugal forces when the turbine speed is high or the blade height is high. The horizontal cross section of the blade 12 is set as crescent-shaped, which makes the flow of steam in the flow channel formed between the two adjacent blades 12 smoother, thereby reducing airflow separation and vortex generation. At the same time, the crescent-shaped cross section makes the stress distribution inside the blade 12 more uniform, avoiding fatigue cracks caused by stress concentration, thereby reducing the possibility of blade 12 fracture.

[0046] Reference Figure 1 and Figure 3The limiting seat 3 includes an integrally formed mounting part 32 and a limiting part 33, with the bottom of the mounting part 32 flush with the bottom of the limiting part 33. The two mounting parts 32 are located at both ends of the limiting part 33 in the horizontal direction, and the two mounting parts 32 are symmetrically arranged about the limiting part 33. The limiting groove 31 is provided on the top wall of the limiting part 33, and the limiting groove 31 extends through both side walls of the limiting part 33 along the length direction. The root bottom 113 and the root neck 112 are engaged in the limiting groove 31, and the inner contour of the limiting groove 31 matches the contours of the root neck 112 and the root bottom 113 in the length direction. This ensures that the position of the limiting seat 3 in the limiting groove 31 is fixed in the width direction, thereby preventing the blade root 11 from shaking and shifting during the riveting of the twin blades 1, which would affect the riveting quality of the twin blades 1. The length of the limiting groove 31 is the same as the length of the root neck 112. Each of the two mounting portions 32 has a mounting hole 321 at its top, which penetrates the mounting portion 32 vertically. Two limiting bolt holes 331 are respectively provided on the two side walls of the limiting portion 33. The two limiting bolt holes 331 are located on both sides of the length direction of the limiting groove 31, and their extension direction is parallel to the length direction of the limiting groove 31. The fixing component 4 is fixedly connected to the limiting portion 33 through the limiting bolt holes 331. The fixing component 4 includes a fixing plate 41 and two fixing bolts 42. The fixing plate 41 extends along the length direction... Fixing holes are provided at both ends of the blade, and the distance between the two fixing holes is the same as the distance between the two limiting bolt holes 331. The fixing bolt 42 passes through the fixing hole and is threadedly connected to the limiting bolt hole 331. The side wall of the fixing plate 41 fits against the side wall of the limiting part 33 and the end face of the root neck 112 in the length direction, so that the two ends of the blade root 11 in the length direction are pressed between the two fixing plates 41, which avoids the blade root 11 from moving along the length direction of the limiting groove 31 when riveting the twin blades 1, thereby facilitating the improvement of the stability of the riveting of the twin blades 1.

[0047] The implementation principle of the riveting fixture for the outer T-shaped blade root 11 and twin blades 1 disclosed in this application embodiment is as follows: When riveting the twin blades 1, firstly, the limiting seat 3 is placed on the working platform, and a bolt is threaded through the mounting hole 321 and connected to the working platform, so that the limiting seat 3 is fixed in position on the working platform. The root bottom 113 and the root neck 112 are adjusted so that the blade root 11 is engaged in the limiting groove 31. Then, the fixing plate 41 is pressed against the side wall of the limiting part 33, and the fixing hole corresponds to the position of the limiting bolt hole 331. Then, the fixing bolt 42 is adjusted so that the fixing bolt 42 passes through the fixing hole and is threadedly connected to the limiting bolt hole 331. The two fixing plates 41 are respectively fixed to the limiting part 33. On both sides of part 33, the two ends of the blade root 11 in the length direction are pressed tightly between the two fixing plates 41. Finally, the shroud 2 is placed on the top of the blade body 12, so that the rivet head 121 passes through the rivet hole 21 provided on the shroud 2. Force is applied to the rivet head 121 and the rivet head 121 is struck, so that the rivet head 121 deforms and tightly fills the gap between the rivet hole 21 and the rivet head 121. The two blade bodies 12 are connected as one. After the riveting is completed, the fixing bolt 42 is removed, the fixing plate 41 is removed, and the blade root 11 is adjusted so that the root bottom 113 and the root neck 112 slide along the limiting groove 31. The twin blades 1 are separated from the limiting seat 3, and the operator rivets the next twin blades 1.

[0048] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. This application is not limited to the exact structures described above and illustrated in the accompanying drawings, and it should not be considered that the specific implementation of this application is limited to these descriptions. For those skilled in the art, various changes and modifications made without departing from the concept of this application should be considered to fall within the protection scope of this application.

Claims

1. A riveting fixture for twin blades with an outer T-shaped blade root, characterized in that, include: The assembly includes twin blades (1), a surrounding band (2), a limiting seat (3), and two sets of fixing components (4). The limiting seat (3) is fixedly mounted on the working platform. A limiting groove (31) is provided on the limiting seat (3). The twin blades (1) are engaged in the limiting groove (31). The two sets of fixing components (4) are fixedly and detachably connected to the two side walls of the limiting seat (3). The fixing components (4) are used to fix the position of the twin blades (1) in the limiting groove (31). The shroud (2) is riveted to the twin blades (1); The twin blades (1) include: a leaf root (11) and two leaf bodies (12) disposed on the leaf root (11); the leaf root (11) is used for fixed connection with the main shaft, and the leaf root (11) includes an integrally formed root top (111), root neck (112) and root bottom (113), the root top (111) is used to install the leaf bodies (12), and the root neck (112) is connected to the root top (111) and the root bottom (113) at both ends along the height direction, respectively. The root top (111) and the root neck (112) have a T-shaped cross section, and the root bottom (113) is symmetrically arranged about the root neck (112); the two end faces of the root top (111), the root neck (112) and the root bottom (113) are flush in the length direction; the bottom of the two leaf blades (12) are fixedly connected to the top wall of the root top (111), the two leaf blades (12) are evenly arranged along the length direction of the root top (111) and are parallel to each other, and the horizontal cross section of the leaf blade (12) is crescent-shaped; the top of the leaf blade (12) is provided with a rivet head (121), and the rivet head (121) is riveted and fixed to the sheath (2); The limiting seat (3) includes an integrally formed mounting part (32) and a limiting part (33). The bottom of the mounting part (32) is flush with the bottom of the limiting part (33). The two mounting parts (32) are located at the two ends of the limiting part (33) in the horizontal direction, and the two mounting parts (32) are symmetrically arranged about the limiting part (33). The limiting groove (31) is disposed on the top wall of the limiting part (33), and the limiting groove (31) penetrates the two side walls of the limiting part (33) along the length direction. The root bottom (113) and the root neck (112) are engaged in the limiting groove (31). The inner contour of the limiting groove (31) matches the two side contours of the root neck (112) and the root bottom (113) along the length direction.

2. The riveting fixture for twin blades with an outer T-shaped blade root as described in claim 1, characterized in that, Weight-reducing grooves (1111) are provided at both ends of the root top (111) in the width direction. The openings of the weight-reducing grooves (1111) are downward, and the two weight-reducing grooves (1111) are symmetrically arranged about the width direction of the root top (111). The extension direction of the weight-reducing grooves (1111) is parallel to the length direction of the root top (111).

3. The riveting fixture for twin blades with an outer T-shaped blade root as described in claim 1, characterized in that, The band (2) is provided with a plurality of rivet holes (21), the diameter of the rivet holes (21) is slightly larger than the diameter of the rivet head (121), and the distance between two adjacent rivet holes (21) is equal to the distance between two rivet heads (121).

4. The riveting fixture for twin blades with an outer T-shaped blade root as described in claim 1, characterized in that, The length of the limiting groove (31) is the same as the length of the root neck (112).

5. The riveting fixture for twin blades with an outer T-shaped blade root as described in claim 1, characterized in that, Each of the two mounting portions (32) has a mounting hole (321) at its top, and the mounting hole (321) penetrates the mounting portion (32) in a vertical direction.

6. The riveting fixture for twin blades with an outer T-shaped blade root as described in claim 1, characterized in that, The limiting part (33) has two limiting bolt holes (331) on each of its two side walls. The two limiting bolt holes (331) are located on both sides of the length direction of the limiting groove (31), and the extension direction of the limiting bolt holes (331) is parallel to the length direction of the limiting groove (31). The fixing component (4) is fixedly connected to the limiting part (33) through the limiting bolt holes (331).

7. The riveting fixture for twin blades with an outer T-shaped blade root according to claim 6, characterized in that, The fixing component (4) includes a fixing plate (41) and two fixing bolts (42). The fixing plate (41) has fixing holes at both ends along the length direction. The distance between the two fixing holes is the same as the distance between the two limiting bolt holes (331). The fixing bolts (42) pass through the fixing holes and are threadedly connected to the limiting bolt holes (331). The sidewall of the fixing plate (41) is in contact with the sidewall of the limiting part (33) and the end face of the root neck (112) in the length direction.

8. The riveting fixture for twin blades with an outer T-shaped blade root according to claim 1, characterized in that, The material of the limiting seat (3) has a hardness greater than 300HRC after heat treatment.

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