Riveting tool for twin blades externally wrapped with T-shaped blade roots

Abstract

The invention relates to the technical field of turbine blade machining, in particular to an externally-wrapped T-shaped blade root twin blade riveting tool which comprises a twin blade, a shroud ring, a limiting seat and two fixing assemblies. The limiting seat is fixedly arranged on the working platform, a limiting groove is formed in the limiting seat, the twin blades are clamped in the limiting groove, the two fixing assemblies are fixedly and detachably connected with the two side walls of the limiting seat, and the fixing assemblies are used for achieving position fixing of the twin blades in the limiting groove; the shroud ring is riveted with the twin blades; according to the riveting tool, the twin blade is independently riveted with the shroud ring, and then the twin blade is mounted into the main shaft after being riveted, so that the situation that the twin blade and the main shaft are locked due to the fact that force is applied to the twin blade during riveting is avoided, the main shaft is prevented from being deformed, and the riveting quality of the twin blade is improved.

Description

Technical Field

[0001] The present application relates to the technical field of steam turbine blade processing, and in particular to a riveting tool for twin blades with an outsourced T-shaped blade root. Background Art

[0002] Steam turbines are important equipment that converts the thermal energy of steam into mechanical energy. They are widely used in thermal power generation, nuclear power and other fields. Blades are the core components for realizing energy conversion in steam turbines. Their performance directly affects the efficiency, reliability and economy of steam turbines. Blades usually consist of three parts: blade body, blade root and blade tip. The blade body is the working part of the blade. Adjacent blade bodies form an airflow channel. When steam flows through the airflow channel, it converts kinetic energy 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 with a shroud to form a blade group.

[0003] With the continuous growth of energy demand and the increasing requirements for energy efficiency, steam turbines need to continuously improve their performance, which requires the blades to be able to operate stably under higher temperature, pressure and speed conditions, while having higher strength, better aerodynamic performance and longer service life, thus promoting the continuous development and innovation of steam turbine blade technology, and twin blade technology is one of them. Twin blades refer to two blades designed as a closely connected structure, which share a blade root or have a special connection structure near the blade root. This unique structure enables the two blades to work together, influence and support each other.

[0004] When assembling the twin blades, after the blade root is installed through the main shaft lock, the circumferential belt needs to be riveted to the blade top. During riveting, on the one hand, the impact force when the hammer hits the blade top is relatively large, causing the blade and the main shaft to lock, and in severe cases causing the blade or main shaft to deform. On the other hand, since the installation height of the main shaft is too high, the main shaft needs to be rotated after each blade is riveted so that the next blade can be rotated to the appropriate position before riveting, making the riveting process inconvenient to operate and the quality of the riveting of the twin blades cannot be guaranteed. Summary of the invention

[0005] In order to improve the quality of twin blade riveting, the present application provides a twin blade riveting tool with an outsourced T-shaped blade root.

[0006] The present application provides an outsourced T-type blade root twin blade riveting tooling that adopts the following technical solution:

[0007] A riveting tool for twin blades with an outsourced T-shaped blade root, comprising: a twin blade, a circumferential belt, a limit seat and two groups of fixing components; the limit seat is fixedly arranged on a working platform, a limit groove is arranged on the limit seat, the twin blade is engaged in the limit groove, the two groups of fixing components are fixedly and detachably connected to the two side walls of the limit seat, the fixing components are used to fix the position of the twin blade in the limit groove; the circumferential belt is riveted to the twin blade.

[0008] By adopting the above technical solution, when riveting the twin blades, first fix the limit seat on the working platform, then engage the twin blades in the limit groove, install the fixing assembly on the two side walls of the limit seat, and fix the twin blades with the fixing assembly so that the twin blades are fixed in the limit groove. Finally, the operator rivets the circumference to the twin blades. With the riveting tooling set up, the twin blades are riveted to the circumference separately, and then the main shaft is installed after the riveting is completed, so as to avoid the twin blades and the main shaft being locked due to the force applied to the twin blades during riveting, and avoid the deformation of the main shaft, thereby improving the riveting quality of the twin blades.

[0009] In a specific possible implementation scheme, the twin blades include: a blade root and two blade bodies arranged on the blade root; the blade root is used to be fixedly connected to the main shaft, the blade root includes a root top, a root neck and a root bottom that are integrally arranged, the root top is used to install the blade body, the two ends of the root neck in the height direction are respectively connected to the root top and the root bottom, the cross-sections of the root top and the root neck are T-shaped, and the root bottom is symmetrically arranged about the root neck; the two end surfaces of the root top, the root neck and the root bottom in the length direction are flush;

[0010] The bottoms of the two blades are fixedly connected to the top wall of the root top, the two blades are evenly arranged along the length direction of the root top, and the two blades are parallel to each other, and the horizontal cross-section of the blade is crescent-shaped;

[0011] A rivet joint is provided on the top of the blade body, and the rivet joint is fixed to the shroud by riveting.

[0012] By adopting the above technical solution, twin blades are arranged, the bottom of the blade body is fixedly connected to the root top, and a rivet joint is arranged on the top of the blade body, which is riveted to the circumferential belt through the rivet joint to achieve mutual connection between the two blade bodies, thereby avoiding deformation of the blades due to a large blade centrifugal force generated when the turbine speed is high or the blade height is high; the horizontal cross-section of the blade body is set to a crescent shape, so that the flow of steam in the flow channel formed between two adjacent blade bodies can be smoother, thereby reducing the separation of the airflow and the generation of vortices. At the same time, the crescent-shaped cross-section makes the stress distribution inside the blade body more uniform, avoiding fatigue cracks on the blade body due to stress concentration, thereby reducing the possibility of blade breakage.

[0013] In a specific feasible implementation scheme, weight-reducing grooves are provided at both ends of the root top in the width direction, the openings of the weight-reducing grooves are downward, and the two weight-reducing grooves are symmetrically arranged about the width direction of the root top, and the extension direction of the weight-reducing grooves is parallel to the length direction of the root top.

[0014] By adopting the above technical solution, the weight-reducing groove is set, which makes it easy to reduce the weight of the blade root, so that the centrifugal force borne by the twin blades is reduced when the turbine speed is high, thereby making it easy to reduce the stress of the blade root, improve the safety and reliability of the twin blades, and increase the service life of the twin blades.

[0015] In a specific possible implementation manner, a plurality of rivet holes are provided on the circumferential belt, the diameter of the rivet holes is slightly larger than the diameter of the rivet head, and the distance between two adjacent rivet holes is equal to the distance between two rivet heads.

[0016] By adopting the above technical solution, the shroud is placed on the top of the blade body, so that the rivet head passes through the rivet hole set on the shroud, and then force is applied to the rivet head, so that the rivet head is deformed and tightly fills the gap between the rivet hole and the rivet head; the spacing between two adjacent rivet holes is equal to the spacing between the two rivet heads, so that the two rivet heads are respectively riveted into two adjacent rivet holes on the shroud, which is convenient for connecting the two blade bodies as a whole, thereby avoiding deformation of the blade due to large blade centrifugal force generated when the turbine speed is high or the blade height is high.

[0017] In a specific possible implementation scheme, the limit seat includes an integrally arranged mounting portion and a limit portion, the mounting portion is flush with the bottom of the limit portion; the two mounting portions are respectively located at two ends of the limit portion in a horizontal direction, and the two mounting portions are symmetrically arranged with respect to the limit portion;

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

[0019] By adopting the above technical scheme, a limit seat is set to engage the root bottom and the root neck in the limit groove, and the inner contour of the limit groove is consistent with the contours on both sides of the root neck and the root bottom in the length direction, so as to ensure that the position of the limit seat in the limit groove along the width direction is fixed, thereby facilitating avoiding shaking and deviation of the blade root when riveting the twin blades, thereby affecting the riveting quality of the twin blades.

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

[0021] By adopting the above technical solution, the length of the limiting groove is the same as the length of the root neck, so that the root neck and the root bottom are completely engaged in the limiting groove, which facilitates enhancing the limiting and fixing effect of the blade root and improving the riveting quality of the twin blades.

[0022] In a specific possible implementation manner, a mounting hole is provided on the top of each of the two mounting portions, and the mounting hole passes through the mounting portion in a vertical direction.

[0023] By adopting the above technical solution and setting the mounting holes, when riveting the twin blades, the limit seat is placed on the work platform, and bolts are passed through the mounting holes to be threadedly connected to the work platform, so that the position of the limit seat on the work platform is fixed, which makes it easy to avoid the position movement of the limit seat during riveting, which affects the riveting effect of the twin blades.

[0024] In a specific feasible implementation scheme, two side walls of the limiting portion are respectively provided with two limiting bolt holes, the two limiting bolt holes are respectively located on both sides of the length direction of the limiting groove, and the extension direction of the limiting bolt holes is parallel to the length direction of the limiting groove, and the fixing component is fixedly connected to the limiting portion through the limiting bolt holes.

[0025] By adopting the above technical solution, the limiting bolt hole provides an installation basis for the fixing component, which facilitates the limiting fixation of the blade root by the fixing component, avoids the position movement of the blade root when riveting the twin blades, and improves the stability of the riveting.

[0026] In a specific possible implementation scheme, the fixing assembly includes a fixing plate and two fixing bolts, the fixing plate is provided with fixing holes at both ends along the length direction, the spacing between the two fixing holes is the same as the spacing between the two limiting bolt holes, and the fixing bolts are threadedly connected with the limiting bolt holes after passing through the fixing holes;

[0027] The side wall of the fixing plate is in contact with the side wall of the limiting portion and the end surface of the root neck in the length direction.

[0028] By adopting the above technical solution, a fixing component is set, and the root bottom and the root neck are adjusted so that the blade root is engaged in the limiting groove, and 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 with 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, thereby avoiding the position movement of the blade root along the length direction of the limiting groove when riveting the twin blades, thereby facilitating improving the stability of the riveting of the twin blades.

[0029] In a specific possible implementation manner, the material of the limit seat has a hardness greater than 300HRC after heat treatment.

[0030] By adopting the above technical solution, the hardness of the material of the limit seat after heat treatment is greater than 300HRC, which makes it easy to avoid deformation of the limit seat caused by the impact force generated by knocking the rivet joint when riveting the twin blades, thereby facilitating the improvement of the service life of the limit seat.

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

[0032] 1. When riveting the twin blades, first place the limit seat on the working platform, use bolts to pass through the mounting holes and threadedly connect with the working platform, so that the limit seat is fixed on the working platform, adjust the root bottom and the root neck, so that the blade root is engaged in the limit groove, and then the fixing plate is pressed against the side wall of the limit part, the fixing hole corresponds to the position of the limit bolt hole, and then adjust the fixing bolt so that the induction bolt passes through the fixing hole and is threadedly connected with the limit bolt hole. The two fixing plates are respectively 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. Finally, place the shroud on the top of the blade body, so that the rivet head passes through the rivet hole set on the shroud, and force is applied to the rivet head so that the rivet head is deformed and tightly fills the gap between the rivet hole and the rivet head. The riveting tooling is set up, and the twin blades are riveted to the shroud separately, and the main shaft is installed after the riveting is completed, so as to avoid the twin blades and the main shaft being locked due to the force applied to the twin blades during riveting, thereby avoiding the deformation of the main shaft and improving the riveting quality of the twin blades.

[0033] 2. A fixing assembly is set up, in which 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, avoiding the position movement of the blade root along the length direction of the limiting groove when riveting the twin blades, thereby facilitating improving the stability of the riveting of the twin blades.

[0034] 3. The material of the limit seat has a hardness greater than 300HRC after heat treatment, which is convenient for avoiding deformation of the limit seat caused by the impact force generated by knocking the rivet joint when riveting the twin blades, thereby facilitating the improvement of the service life of the limit seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation to the present application.

[0036] Figure 1 It is a schematic diagram of the overall structure of a riveting tool for twin blades with an outsourced T-shaped blade root in the present application.

[0037] Figure 2 This is a schematic diagram of a twin blade and a shroud structure of an outsourced T-shaped blade root twin blade riveting tooling according to the present application.

[0038] Figure 3 It is a schematic diagram of the limit seat structure of the outsourced T-shaped blade root twin blade riveting tooling of the present application.

[0039] Description of the drawings: 1. Twin blades; 11. Blade root; 111. Root top; 1111. Weight reduction groove; 112. Root neck; 113. Root bottom; 12. Blade body; 121. Riveted joint; 2. Belt; 21. Riveted hole; 3. Limit seat; 31. Limit groove; 32. Mounting part; 321. Mounting hole; 33. Limit part; 331. Limit bolt hole; 4. Fixing assembly; 41. Fixing plate; 42. Fixing bolt. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work 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 understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of this application, unless otherwise specified, "plurality" means two or more.

[0042] The following is combined with Figure 1-3 This application is described in further detail.

[0043] The embodiment of the present application discloses a riveting tool for twin blades with an outsourced T-shaped blade root.

[0044] Reference Figure 1 , a riveting tool for twin blades with an outer T-shaped blade root, comprising a twin blade 1, a belt 2, a limit seat 3 and two groups of fixing components 4; the limit seat 3 is fixedly arranged on the working platform, and a limit groove 31 is arranged on the limit seat 3, the twin blade 1 is engaged in the limit groove 31, and the two groups of fixing components 4 are fixedly and detachably connected to the two side walls of the limit seat 3, and the two ends of the twin blade 1 are located between the two groups of fixing components 4, and the fixing component 4 is used to realize the position fixation of the twin blade 1 in the limit groove 31; the belt 2 is riveted and fixed to the twin blade 1; when riveting the twin blade 1, the limit seat 3 is first fixedly installed on the working platform, and then the twin blade 1 is engaged in the limit groove 31, and the fixing component 4 is installed on the two side walls of the limit seat 3, and the fixing component 4 limits and fixes the twin blade 1, so that the position of the twin blade 1 is fixed in the limit groove 31, and finally, the operator rivets the belt 2 to the twin blade 1. At the same time, the material of the limit seat 3 has a hardness greater than 300HRC after heat treatment, so as to avoid the stress of the twin blades 1 during riveting causing the limit seat 3 to deform, thereby affecting the service life of the riveting tooling.

[0045] Reference Figure 2The twin blade 1 includes a blade root 11 and two blade bodies 12 arranged on the blade root 11; when assembling the steam turbine, the blade root 11 is fixedly connected to the main shaft so that the blade body 12 can rotate synchronously with the main shaft; the blade root 11 includes a root top 111, a root neck 112 and a root bottom 113 which are integrally arranged, and 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, and the root bottom 113 is symmetrically arranged about the root neck 112; the two end surfaces of the root top 111, the root neck 112 and the root bottom 113 in the length direction are flush; weight-reducing grooves 1111 are arranged at both ends of the root top 111 in the width direction, the opening of the weight-reducing grooves 1111 is downward, and the two weight-reducing grooves 1111 are symmetrically arranged about the width direction of the root top 111, and the extension direction of the weight-reducing grooves 1111 is parallel to the length direction of the root top 111. The bottoms of the 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 direction of the root top 111, and the two blades 12 are parallel to each other, and the horizontal cross-section of the blade 12 is crescent-shaped; a rivet joint 121 is arranged on the top of the blade 12, and a plurality of rivet holes 21 are arranged on the shroud 2, the aperture of the rivet hole 21 is slightly larger than the diameter of the rivet joint 121, the length of the rivet joint 121 is larger than the depth of the rivet hole 21, the spacing between two adjacent rivet holes 21 is equal to the spacing between the two rivet joints 121, and the rivet joint 121 is riveted and fixed to the shroud 2; by riveting The head 121 is riveted to the shroud 2 to achieve mutual connection between the two blades 12, thereby avoiding deformation of the blades due to a large blade centrifugal force generated when the turbine speed is high or the height of the blade 12 is high; the horizontal cross-section of the blade 12 is set to a crescent shape, so that the steam can flow more smoothly in the flow channel formed between two adjacent blades 12, thereby reducing the separation of the airflow and the generation of vortices. At the same time, the crescent-shaped cross-section makes the stress distribution inside the blade 12 more uniform, avoiding fatigue cracks in the blade 12 due to stress concentration, thereby reducing the possibility of breakage of the blade 12.

[0046] Reference Figure 1 and Figure 3The limiting seat 3 includes an integral mounting portion 32 and a limiting portion 33, and the mounting portion 32 is flush with the bottom of the limiting portion 33; the two mounting portions 32 are respectively located at the two ends of the limiting portion 33 in the horizontal direction, and the two mounting portions 32 are symmetrically arranged about the limiting portion 33; a limiting groove 31 is arranged on the top wall of the limiting portion 33, and the limiting groove 31 passes through the two side walls of the limiting portion 33 along the length direction, and the root bottom 113 and the root neck 112 are engaged and arranged in the limiting groove 31, and the inner contour of the limiting groove 31 is consistent with the contours of the root neck 112 and the two sides of the length direction of the root bottom 113; it is convenient to ensure that the position of the limiting seat 3 in the limiting groove 31 along the width direction is fixed, and then it is convenient to avoid the shaking and deviation of the blade root 11 when the twin blades 1 are riveted, thereby affecting 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. The tops of the two mounting parts 32 are each provided with a mounting hole 321, and the mounting hole 321 passes through the mounting part 32 in the vertical direction; two side walls of the limiting part 33 are respectively provided with two limiting bolt holes 331, and the two limiting bolt holes 331 are respectively located on both sides of the length direction of the limiting groove 31, and the extending direction of the limiting bolt holes 331 is parallel to the length direction of the limiting groove 31, and the fixing component 4 is fixedly connected to the limiting part 33 through the limiting bolt holes 331; the fixing component 4 includes a fixing plate 41 and two fixing bolts 42, and the fixing plate 41 is arranged along the length direction Fixing holes are provided at both ends, and the spacing between the two fixing holes is the same as the spacing between the two limiting bolt holes 331. The fixing bolts 42 pass through the fixing holes and are threadedly connected with the limiting bolt holes 331; the side walls of the fixing plates 41 are fitted with the side walls of the limiting portion 33 and the end faces 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 tightly between the two fixing plates 41, avoiding the blade root 11 from moving along the length direction of the limiting groove 31 when riveting the twin blades 1, thereby facilitating improving the stability of the riveting of the twin blades 1.

[0047] The embodiment of the present application discloses a riveting tool for twin blades 1 with an outsourced T-shaped blade root 11. The implementation principle is as follows: when riveting the twin blades 1, first place the limit seat 3 on the work platform, use bolts to pass through the mounting holes 321 and threadedly connect with the work platform, so that the limit seat 3 is fixed on the work platform, adjust the root bottom 113 and the root neck 112 so that the blade root 11 is engaged in the limit groove 31, then close the fixing plate 41 to the side wall of the limit portion 33, the fixing hole corresponds to the position of the limit bolt hole 331, and then adjust the fixing bolt 42 so that the fixing bolt 42 passes through the fixing hole and is threadedly connected with the limit bolt hole 331, and the two fixing plates 41 are respectively fixed on the limit The two sides of the part 33 are arranged so that the two ends of the blade root 11 in the length direction are pressed 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 set on the shroud 2, and force is applied to the rivet head 121. The rivet head 121 is knocked so that the rivet head 121 is deformed 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 bolts 42 are 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 limit groove 31. The twin blade 1 is separated from the limit seat 3, and the operator rivets the next twin blade 1.

[0048] The above embodiments are only used to illustrate the technical solution of the present application, but not to limit it. The present application is not limited to the exact structure described above and illustrated in the accompanying drawings, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, various changes and modifications made without departing from the concept of the present application should be deemed to belong to the protection scope of the present application.

Claims

1. A riveting tool for twin blades with outsourced T-shaped blade roots, characterized in that: include: A twin blade (1), a circumferential belt (2), a limiting seat (3) and two groups of fixing components (4); the limiting seat (3) is fixedly arranged on a working platform, a limiting groove (31) is arranged on the limiting seat (3), the twin blade (1) is engaged in the limiting groove (31), the two groups of fixing components (4) are fixedly and detachably connected to the two side walls of the limiting seat (3), and the fixing components (4) are used to fix the position of the twin blade (1) in the limiting groove (31); the circumferential belt (2) is riveted to the twin blade (1).

2. The riveting tool for twin blades with outsourced T-shaped blade roots according to claim 1 is characterized in that: The twin blade (1) comprises: a blade root (11) and two blade bodies (12) arranged on the blade root (11); the blade root (11) is used for fixed connection with a main shaft, the blade root (11) comprises a root top (111), a root neck (112) and a root bottom (113) which are arranged integrally, the root top (111) is used for mounting the blade body (12), the root neck (112) is connected to the root top (111) and the root bottom (113) at two ends in the height direction, the root top (111) and the root neck (112) are respectively connected, the cross-sections of the root top (111) and the root neck (112) are T-shaped, and the root bottom (113) is symmetrically arranged with respect to the root neck (112); the two end surfaces of the root top (111), the root neck (112) and the root bottom (113) in the length direction are flush; The bottoms of the 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 direction of the root top (111); the two blades (12) are parallel to each other; and the horizontal cross-section of the blade (12) is crescent-shaped; A rivet joint (121) is provided at the top of the blade body (12), and the rivet joint (121) is riveted and fixed to the shroud (2).

3. The riveting tool for twin blades with outsourced T-shaped blade roots according to claim 2 is 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 with respect to the width direction of the root top (111), and the extension direction of the weight-reducing grooves (1111) is parallel to the length direction of the root top (111).

4. The riveting tool for twin blades with outsourced T-shaped blade roots according to claim 2 is characterized in that: The circumferential belt (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).

5. The riveting tool for twin blades with outsourced T-shaped blade roots according to claim 1 is characterized in that: The limiting seat (3) comprises an integrally arranged mounting portion (32) and a limiting portion (33), wherein the mounting portion (32) is flush with the bottom of the limiting portion (33); the two mounting portions (32) are respectively located at two ends of the limiting portion (33) in a horizontal direction, and the two mounting portions (32) are symmetrically arranged with respect to the limiting portion (33); The limiting groove (31) is arranged on the top wall of the limiting portion (33), and the limiting groove (31) penetrates the two side walls of the limiting portion (33) along the length direction; the root bottom portion (113) and the root neck portion (112) are snap-fitted and arranged in the limiting groove (31); the inner contour of the limiting groove (31) is matched with the two side contours of the root neck portion (112) and the root bottom portion (113) in the length direction.

6. The riveting tool for twin blades with outsourced T-shaped blade roots according to claim 5 is characterized in that: The length of the limiting groove (31) is the same as the length of the root neck (112).

7. The riveting tool for twin blades with outsourced T-shaped blade roots according to claim 5 is characterized in that: The tops of the two mounting portions (32) are each provided with a mounting hole (321), and the mounting hole (321) passes through the mounting portion (32) in a vertical direction.

8. The riveting tool for twin blades with outsourced T-shaped blade roots according to claim 5 is characterized in that: Two side walls of the limiting portion (33) are respectively provided with two limiting bolt holes (331), the two limiting bolt holes (331) are respectively 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), and the fixing assembly (4) is fixedly connected to the limiting portion (33) through the limiting bolt holes (331).

9. The riveting tool for twin blades with outsourced T-shaped blade roots according to claim 8 is characterized in that: The fixing assembly (4) comprises a fixing plate (41) and two fixing bolts (42); fixing holes are provided at both ends of the fixing plate (41) along the length direction; the spacing between the two fixing holes is the same as the spacing between the two limiting bolt holes (331); and the fixing bolts (42) are threadedly connected to the limiting bolt holes (331) after passing through the fixing holes; The side wall of the fixing plate (41) is in contact with the side wall of the limiting portion (33) and the end surface of the root neck portion (112) in the length direction.

10. The riveting tool for twin blades with outsourced T-shaped blade roots according to claim 1, characterized in that: The material of the limit seat (3) has a hardness greater than 300HRC after heat treatment.

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