Method and grinding machine for grinding and forming tenon teeth of turbine blade of aero-engine

Abstract

The invention discloses a method and a grinding machine for grinding and forming tenon teeth of turbine blades of aero-engines, and belongs to the technical field of machining of turbine blades of aero-engines. The method comprises the steps that a plurality of turbine blades are clamped on a plurality of blade body clamping stations on a clamping device installed on a grinding machine respectively, blade bodies of the turbine blades are clamped and locked on the blade body clamping stations at the same time through the clamping device, and the turbine blades are fixed; the first quasi-installation positioning parts of the tenons of the multiple turbine blades fixed by the clamping device are ground through a grinding wheel installed on the grinding machine to form first installation positioning parts; and the second quasi-installation positioning parts of the tenons of the multiple turbine blades fixed by the clamping device are ground through a grinding wheel installed on the grinding machine to form second installation positioning parts. According to the grinding machining forming method, the turbine blade can be conveniently clamped and positioned, and the situation that tenon teeth are ground and machined on the tenon through a clamping device is limited is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft engine turbine blade processing, and in particular to a method and a grinding machine for grinding and forming tenon teeth of aircraft engine turbine blades. Background Art

[0002] Turbine blades are important parts that play an energy conversion role in aircraft engines. The tenon processing of turbine blades is the first step in blade machining. The tenon processing of turbine blades is also a key link in the blade manufacturing process. It is particularly important to position and fix the blades before processing. However, since the blades are still in the precision casting blank state before the tenon processing, the same positioning reference as when casting the blank is required to position the blades, resulting in the structure of the clamping tooling being usually more complicated.

[0003] Furthermore, at present, in the tenon processing process of turbine blades, the method of positioning the turbine blades by clamping tooling mainly relies on "six-point positioning". The principle of six-point positioning is to use six positioning points to completely constrain the six degrees of freedom of the blade in space, including three directions of movement and three directions of rotation. The six-point positioning is mainly distributed in the front extension section, middle blade body, rear end serrated crown or blade tip of the blade, among which the front extension section of the blade is specifically the connecting part between the back of the tenon and the front end of the blade body, the front extension section is close to the tenon, and the front extension section can be regarded as a part of the tenon; when the turbine blade is positioned by the six-point positioning method, and in the process of installing the turbine blade on the grinding machine by the existing clamping tooling and grinding the tenon through the grinding wheel to produce the tenon, the part of the clamping tooling used to position the front extension section occupies a length section of the tenon, so that the structure and processing accuracy of the tenon formed by grinding the tenon are restricted by the clamping tooling, which is not conducive to the processing of the tenon and hinders the optimization of the structure of the tenon. Therefore, there is an urgent need for a grinding forming method that is conducive to clamping and positioning the turbine blade and avoids the restriction of the clamping tool on the grinding of the tenon teeth on the tenon. Summary of the Invention

[0004] The purpose of the present invention is to overcome at least one of the shortcomings of the above-mentioned prior art and to provide a method for grinding and forming the tenons of aircraft engine turbine blades, which is conducive to clamping and positioning the turbine blades and avoids the clamping device from restricting the grinding of tenons on the tenon; in addition, a grinding machine is also provided.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: According to one aspect of the present application, a method for grinding and forming tenon teeth of an aero-engine turbine blade is provided, the method comprising: Clamping the plurality of turbine blades respectively on a plurality of blade body clamping stations provided on a clamping device installed on a grinding machine, and simultaneously clamping and locking the blade bodies of the plurality of turbine blades on the blade body clamping stations by the clamping device, thereby securing the plurality of turbine blades and ensuring that the tenons of the plurality of turbine blades are exposed outside the clamping device; Grinding the first quasi-mounting positioning portions of the tenons of the plurality of turbine blades fixed by the clamping device using a grinding wheel installed on the grinding machine, so that the first quasi-mounting positioning portions of the tenons of the plurality of turbine blades are respectively ground to form first mounting positioning portions; Grinding the second quasi-mounting positioning portions of the tenons of the plurality of turbine blades fixed by the clamping device by the grinding wheel installed on the grinding machine, so that the second quasi-mounting positioning portions of the tenons of the plurality of turbine blades are respectively ground to form second mounting positioning portions; In which, when the grinding wheel grinds the first quasi-mounting positioning part and the second quasi-mounting positioning part of the tenon of the multiple turbine blades fixed by the clamping device, the grinding wheel is located on the outside of the clamping device, and the clamping device does not interfere with the grinding wheel.

[0006] The beneficial effects of the present invention are as follows: in the method for grinding and forming the tenons of aircraft engine turbine blades in this embodiment, the blade bodies of multiple turbine blades are clamped and locked on the blade body clamping station at the same time by the clamping device, so that the multiple turbine blades are fixed and positioned, and the fixing positions of the turbine blades by the clamping device are all at the blade body positions of the turbine blades, which is beneficial for keeping the clamping device away from the tenons of the turbine blades, thereby avoiding the need for the clamping device to fix the tenons of the turbine blades, which causes restrictions and interference in the grinding of the tenons on the tenons by the clamping device, is beneficial for optimizing the design of the tenon structure, and is beneficial for meeting the processing requirements of various tenon structures; further, the blade bodies of multiple turbine blades are clamped and locked on the blade body clamping station at the same time by the clamping device, which is beneficial for fixing multiple turbine blades and grinding the tenons of multiple turbine blades, and is beneficial for improving the processing efficiency of grinding the tenons of the turbine blades.

[0007] According to one embodiment of the present application, before grinding the second quasi-installation positioning portions of the tenons of the plurality of turbine blades fixed by the clamping device using the grinding wheel installed on the grinding machine, so that the second quasi-installation positioning portions of the tenons of the plurality of turbine blades are respectively ground to form the second installation positioning portions, the method for grinding and forming the tenon teeth of aircraft engine turbine blades further includes: By turning over the clamping device, the multiple turbine blades fixed by the clamping device are turned over as the clamping device is turned over, so that the second quasi-installation positioning portion of the tenon of the multiple turbine blades fixed by the clamping device is exchanged with the first quasi-installation positioning portion.

[0008] In this embodiment, the clamping device is turned over so that the multiple turbine blades fixed by the clamping device are turned over as the clamping device is turned over, so that the first quasi-installation positioning part of the tenon of the turbine blade is ground by the grinding wheel. After the clamping device is turned over, the second quasi-installation positioning part of the tenon of the turbine blade is ground by the grinding wheel. There is no need to take out the multiple turbine blades fixed by the clamping device separately and then fix them, which is beneficial to improving the grinding efficiency. In addition, it is also beneficial to reduce the number of grinding wheels that need to be installed on the grinding machine.

[0009] According to one embodiment of the present application, the clamping device includes: A support base, wherein a plurality of installation avoidance grooves are provided on the support base at intervals along the length direction thereof, and the plurality of installation avoidance grooves extend along the width direction of the support base; A blade support and limit seat is provided with a plurality of installation avoidance grooves in a one-to-one correspondence, the blade support and limit seat is installed on the support seat and is respectively located in the installation avoidance grooves, the upper side of the blade support and limit seat is provided with a plurality of support and limit portions for one-to-one corresponding to the contour of the lower length section of the blade of the turbine blade to perform support and limit, the plurality of support and limit portions are arranged at intervals along the length direction of the turbine blade, and the plurality of support and limit portions can jointly perform support and limit on the contours of the multiple lower length sections of the blade of the turbine blade; The blade body pressing limit seat is provided with a plurality of blade body supporting limit seats in a one-to-one correspondence, and the plurality of blade body pressing limit seats are movably mounted on the support seat in a one-to-one correspondence with the plurality of blade body supporting limit seats. The lower side of the blade body pressing limit seat is provided with a plurality of pressing limit parts for fitting and pressing the contour of the upper length section of one blade body of the turbine blade one by one. The plurality of pressing limit parts are spaced apart along the length direction of the turbine blade, and the plurality of pressing limit parts can jointly fit and press the contours of the upper length sections of the blade body of the turbine blade. After the blade body pressing limit seat is moved toward the blade body supporting limit seat, the blade body pressing limit seat is locked, and the blade body of the turbine blade located between the plurality of supporting limit parts and the plurality of pressing limit parts can be fixed under the limiting action of the plurality of supporting limit parts and the plurality of pressing limit parts; The method comprises: clamping the plurality of turbine blades on a plurality of blade body clamping stations provided on a clamping device installed on a grinding machine; and simultaneously clamping and locking the blade bodies of the plurality of turbine blades on the blade body clamping stations by the clamping device to achieve fixing of the plurality of turbine blades, including: The plurality of turbine blades are respectively placed between the plurality of the lifting limit parts and the plurality of the pressing limit parts, the blade body pressing limit seat is moved toward the blade body lifting limit seat, and then the blade body pressing limit seat is locked, so that the blade body lower side length section contours and the blade body upper side length section contours of the plurality of turbine blades located between the plurality of the lifting limit parts and the plurality of the pressing limit parts are fixed under the limiting action of the plurality of the lifting limit parts and the plurality of the pressing limit parts.

[0010] In this embodiment, by placing multiple turbine blades respectively between multiple lifting limit parts and multiple pressing limit parts, and then locking the blade body pressing limit seat after the blade body pressing limit seat is moved toward the blade body lifting limit seat, it is beneficial to lock the lower length section contour of the blade body and the upper length section contour of the multiple blade body through the multiple lifting limit parts and the multiple pressing limit parts, thereby achieving fixed limitation of the turbine blade; further, the multiple lifting limit parts can jointly fit the multiple lower length section contours of the blade body of the turbine blade for lifting and limiting, and the multiple pressing limit parts can jointly fit the multiple upper length section contours of the blade body of the turbine blade for pressing and limiting, which is beneficial to increase the contact area between the lifting limit part and the pressing limit part and the blade body of the turbine blade, thereby improving the reliability and stability of the lifting limit part and the pressing limit part in locking the blade body, and avoiding deformation of the blade body of the turbine blade due to excessive local pressure caused by the squeezing of the lifting limit part and the pressing limit part.

[0011] According to one embodiment of the present application, the grinding process of the first quasi-installation positioning portion of the tenon of the plurality of turbine blades fixed by the clamping device by a grinding wheel installed on the grinding machine includes: According to a first preset grinding amount of the first quasi-mounting positioning portions of the tenons of the plurality of turbine blades, a current feed grinding amount of the grinding wheel installed on the grinding machine is adjusted, and the first quasi-mounting positioning portions of the tenons of the plurality of turbine blades are ground by the grinding wheel in sequence by the first preset grinding amount; Grinding the second quasi-installation positioning portions of the tenons of the plurality of turbine blades fixed by the clamping device by the grinding wheel installed on the grinding machine includes: According to the second preset grinding amount of the second quasi-mounting positioning part of the tenon of the multiple turbine blades, the current feed grinding amount of the grinding wheel installed on the grinding machine is adjusted, and the second quasi-mounting positioning part of the tenon of the multiple turbine blades is ground to the second preset grinding amount in sequence through the grinding wheel.

[0012] In this embodiment, the first quasi-installation positioning portion of the tenon of multiple turbine blades is ground to a first preset grinding amount in sequence by a grinding wheel, and the second quasi-installation positioning portion of the tenon of multiple turbine blades is ground to a second preset grinding amount in sequence by a grinding wheel. This is beneficial for grinding multiple turbine blades in sequence, improving processing efficiency and improving consistency in grinding multiple turbine blades.

[0013] According to one embodiment of the present application, the step of clamping the plurality of turbine blades respectively on a plurality of blade clamping stations provided on a clamping device installed on a grinding machine includes: The plurality of turbine blades are respectively placed on the plurality of blade body clamping stations provided on the clamping device on the grinding machine, and the plurality of turbine blades placed on the plurality of blade body clamping stations are locked and fixed by locking members, so that the tenons of the plurality of turbine blades locked and fixed on the plurality of blade body clamping stations are tilted upward, and a first angle is formed between a center plane passing through the center of the tenons of the plurality of turbine blades locked and fixed on the plurality of blade body clamping stations and a horizontal plane, wherein the angle of the first angle is any value between 10° and 30°.

[0014] In this embodiment, after the multiple turbine blades placed on multiple blade body clamping stations are locked and fixed by locking parts, the tenons of the turbine blades are set at an angle, and a first angle is formed between the center plane passing through the center of the tenons of the multiple turbine blades locked and fixed on the multiple blade body clamping stations and the horizontal plane. The angle of the first angle is any value between 10°-30°, which is conducive to grinding on the tenons of the turbine blades to form tenons with complete guide circles at the roots. When the turbine blades with tenons with complete guide circles at the roots are installed on the turbine disk, it is conducive to improving the compactness of the engagement between the tenons and the tooth grooves in the tenons of the turbine disk, thereby improving the reliability and stability of the installation and positioning of the turbine blades, and also conducive to improving the reliability and stability of the turbine blades with tenons with complete guide circles at the roots when installed on aircraft engines.

[0015] According to another aspect of the present application, a grinding machine is provided for implementing the above-mentioned method for grinding and forming tenon teeth of aircraft engine turbine blades, comprising: Bed; a workbench, mounted on the bed; The clamping device is mounted on the workbench, and is provided with a plurality of blade clamping stations, which can clamp and lock the blades of a plurality of turbine blades at the same time; A grinding drive device is mounted on the bed; a grinding wheel frame, mounted on the grinding drive device and located on the upper side of the workbench, the grinding wheel frame being mounted opposite to the tenon of the turbine blade clamped and locked on the blade body clamping station, the grinding wheel being capable of grinding the tenon of the turbine blade under the drive of the grinding drive device; A control unit is provided, wherein the grinding driving device is electrically connected to the control unit.

[0016] The clamping device in this embodiment is installed on a workbench, and the clamping device is provided with multiple blade clamping stations. The multiple blade clamping stations can clamp and lock the blades of multiple turbine blades at the same time, so that the blades of multiple turbine blades can be clamped and locked on the blade clamping stations at the same time by the clamping device, so as to fix and position multiple turbine blades, and the fixing position of the turbine blades by the clamping device is at the blade position of the turbine blade, which is beneficial to keep the clamping device away from the tenon of the turbine blade, thereby avoiding the need for the clamping device to fix the tenon of the turbine blade, resulting in the clamping device causing restrictions and interference in the grinding of tenons on the tenon, which is beneficial to optimizing the structure of the tenon and meeting the processing requirements of various tenon structures; further, the blades of multiple turbine blades can be clamped and locked on the blade clamping stations at the same time by the clamping device, which is beneficial to fix multiple turbine blades and grind the tenons of multiple turbine blades, and is beneficial to improve the processing efficiency of grinding tenons on the tenons of turbine blades.

[0017] According to one embodiment of the present application, the grinding machine further includes: An angle adjustment pad is installed on the workbench, and an angle adjustment support surface is provided on the angle adjustment pad, and a second angle is formed between the angle adjustment support surface and the horizontal plane, wherein the angle of the second angle is any value between 10° and 30°; when the clamping device is installed on the angle adjustment support surface, the tenons of the multiple turbine blades locked and fixed on the multiple blade clamping stations are tilted upward, and a third angle is formed between the center plane of the tenons passing through the centers of the multiple turbine blades and the horizontal plane, and the angle of the third angle is equal to the angle of the second angle.

[0018] In this embodiment, an angle adjustment pad is installed on the workbench. When the clamping device is installed on the angle adjustment support surface, the angle of the third angle formed between the center plane of the center of the tenon of the multiple turbine blades and the horizontal plane is equal to the angle of the second angle, which is conducive to grinding on the tenon of the turbine blade to form tenons with complete guide circles at the root. When the turbine blade with tenons with complete guide circles at the root is installed on the turbine disk, it is conducive to improving the compactness of the engagement between the tenons and the tooth grooves in the tenon groove of the turbine disk, thereby improving the reliability and stability of the installation and positioning of the turbine blade, and also conducive to improving the reliability and stability of the turbine blade with tenons with complete guide circles at the root when it is installed on the aircraft engine.

[0019] According to one embodiment of the present application, a plurality of the clamping devices are provided, and the plurality of the clamping devices are linearly arranged along the length direction of the angle adjustment pad and installed on the angle adjustment support surface.

[0020] This embodiment has multiple clamping devices, and the multiple clamping devices are installed on the angle adjustment support surface in a straight line along the length direction of the angle adjustment pad, which is conducive to installing multiple turbine blades on multiple clamping devices respectively, thereby increasing the number of tenons of the turbine blades that can be processed in sequence in one grinding process, and improving the processing efficiency of grinding the tenons of the turbine blades into tenons.

[0021] According to one embodiment of the present application, the clamping device includes: A support base, wherein a plurality of installation avoidance grooves are provided on the support base at intervals along the length direction thereof, and the plurality of installation avoidance grooves extend along the width direction of the support base; A blade support and limit seat is provided with a plurality of installation avoidance grooves in a one-to-one correspondence, the blade support and limit seat is installed on the support seat and is respectively located in the installation avoidance grooves, the upper side of the blade support and limit seat is provided with a plurality of support and limit portions for one-to-one corresponding to the contour of the lower length section of the blade of the turbine blade to perform support and limit, the plurality of support and limit portions are arranged at intervals along the length direction of the turbine blade, and the plurality of support and limit portions can jointly perform support and limit on the contours of the multiple lower length sections of the blade of the turbine blade; The support frame is fixed with a plurality of support members, and the support frame is fixed with a plurality of support members on the support frame.

[0022] In this embodiment, the upper side of the blade lifting limit seat is provided with a plurality of lifting limit parts for fitting and lifting the contour of the lower length section of the corresponding turbine blade, and the plurality of lifting limit parts can jointly fit and lift the contours of the lower length sections of the turbine blade; further, the lower side of the blade pressing limit seat is provided with a plurality of clamping limit parts for fitting and pressing the contour of the upper length section of the corresponding turbine blade, and the plurality of clamping limit parts can jointly fit and press the contours of the upper length sections of the turbine blade, so that multiple turbine blades can be placed respectively between the plurality of lifting limit parts and the plurality of clamping limit parts, and then the blade pressing limit seat is moved toward the blade lifting limit seat and the blade pressing limit seat is locked, which is facilitating the lifting of the blades through the plurality of lifting limit parts. Together with multiple clamping limit parts, the lower length section contours of the turbine blade and the upper length section contours of the multiple blade bodies are locked, thereby achieving fixed limitation of the turbine blade; further, multiple lifting limit parts can jointly perform lifting and limiting of the multiple lower length section contours of the turbine blade, and multiple clamping limit parts can jointly perform pressing and limiting of the multiple upper length section contours of the turbine blade, which is beneficial to increasing the contact area between the lifting limit part and the clamping limit part and the blade body of the turbine blade, thereby helping to improve the reliability and stability of the lifting limit part and the clamping limit part in locking the blade body, and helping to avoid deformation of the blade body of the turbine blade due to excessive local pressure caused by the squeezing of the lifting limit part and the clamping limit part, and helping to protect the blade shape of the blade body of the turbine blade.

[0023] According to one embodiment of the present application, the clamping device further includes: The cam is fixed to the support frame when the cam is in a closed position and the cam is in a closed position, and the cam is fixed to the support frame when the cam is in a closed position and the cam is in a closed position.

[0024] The blade body pressing limit seat in this embodiment is vertically mounted on the support seat through a vertical movable adjustment mechanism, which is beneficial for the blade body pressing limit seat to move in the vertical direction relative to the support seat under the adjustment of the vertical movable adjustment mechanism, and is beneficial for driving the blade body pressing limit seat in the vertical direction to move to the pressing position and vertically press the blade body of the turbine blade located between the multiple supporting limit parts and the multiple pressing limit parts, thereby improving the reliability of the multiple supporting limit parts and the multiple pressing limit parts in pressing and fixing the blade body of the turbine blade; in addition, when the turbine blade needs to be removed, it is convenient to drive the blade body pressing limit seat to move vertically away from the blade body of the turbine blade through the vertical movable adjustment mechanism, thereby facilitating the removal of the turbine blade.

[0025] According to one embodiment of the present application, the blade lifting limit seat includes: a blade support limit block 1, the blade support limit block 1 being mounted on the support seat and located in the mounting avoidance groove, the upper side of the blade support limit block 1 being provided with a support limit portion 1 for fitting and supporting a profile 1 of a lower length section of the turbine blade; The blade body lifting limit block 2 is installed on the support seat opposite to the blade body lifting limit block 1 along the width direction of the support seat and is located on one side of the blade body lifting limit block 1. The upper side of the blade body lifting limit block 1 is provided with a lifting limit part 2 for fitting and lifting the blade body lower side length section contour 2 of the turbine blade. The lifting limit part includes the lifting limit part 1 and the lifting limit part 2, and the blade body lower side length section contour includes the blade body lower side length section contour 1 and the blade body lower side length section contour 2.

[0026] The lifting and limiting part 1 in this embodiment can fit and lift the contour 1 of the lower length section of the blade body of the turbine blade, which is beneficial to increase the contact area between the lifting and limiting part 1 and the contour 1 of the lower length section of the blade body; the lifting and limiting part 2 can fit and lift the contour 2 of the lower length section of the blade body of the turbine blade, which is beneficial to increase the contact area between the lifting and limiting part 2 and the contour 2 of the lower length section of the blade body, and the lifting and limiting part 1 and the lifting and limiting part 2 jointly lift and limit the blade body along the length direction of the blade body of the turbine blade. In the process of pressing the blade body of the turbine blade, the small contact area between the contour of the lower length section of the blade body and the lifting and limiting part can avoid forming local pressure and causing deformation of the blade body, thereby improving the reliability of the lifting and limiting part in lifting and limiting the blade body of the turbine blade, and is beneficial to protecting the blade shape of the blade body of the turbine blade.

[0027] According to one embodiment of the present application, the blade body pressing limit seat includes: A sliding mounting seat, slidably mounted on the support seat, and capable of sliding in a vertical direction under the drive of the vertical movable adjustment mechanism; a blade body pressing limit block 1, the blade body pressing limit block 1 being mounted on the lower side of the sliding mounting seat opposite to the blade body lifting limit block 1 and being located in the mounting avoidance groove; a blade body pressing portion 1 being provided on the lower side of the blade body pressing limit block 1 for fitting and pressing a contour 1 of an upper length section of the turbine blade; The blade body clamping limit block 2 is installed on the lower side of the sliding mounting seat opposite to the blade body lifting limit block 2 along the width direction of the support seat and is located on one side of the blade body clamping limit block 1. The lower side of the blade body clamping limit block 2 is provided with a clamping limit part 2 for fitting and clamping the upper length segment contour 2 of the turbine blade. The clamping limit part includes the clamping limit part 1 and the clamping limit part 2, and the upper length segment contour of the blade body includes the upper length segment contour 1 and the upper length segment contour 2 of the blade body.

[0028] The blade body pressing portion 1 in this embodiment can fit and press the upper length section contour 1 of the blade body of the turbine blade, which is beneficial to increase the contact area between the blade body pressing portion 1 and the upper length section contour 1 of the blade body; the blade body pressing portion 2 can fit and press the upper length section contour 2 of the blade body of the turbine blade, which is beneficial to increase the contact area between the blade body pressing portion 2 and the upper length section contour 2 of the blade body, and the blade body pressing portion 1 and the blade body pressing portion 2 jointly press and limit the blade body along the length direction of the blade body of the turbine blade. In the process of pressing the blade body of the turbine blade, the small contact area between the upper length section contour of the blade body and the blade body pressing portion is avoided to form local pressure and cause deformation of the blade body, thereby improving the reliability of the blade body pressing portion in pressing and limiting the blade body of the turbine blade, and is beneficial to protecting the blade shape of the blade body of the turbine blade.

[0029] According to an embodiment of the present application, a vertical guide groove 1 is provided on the lower side of the sliding mounting seat, and the blade pressing limit block 1 is installed in the vertical guide groove 1 through an adjusting bolt 1, and the adjusting bolt 1 is threadedly connected to a vertical threaded through hole 1 provided on the sliding mounting seat, and the upper and lower ends of the adjusting bolt 1 respectively pass through the vertical threaded through hole 1, and the blade pressing limit block 1 is installed on the lower end of the adjusting bolt 1. When the adjusting bolt 1 is screwed, the blade pressing limit block 1 moves vertically in the vertical direction under the guidance of the vertical guide groove 1; A second vertical guide groove is provided on the lower side of the sliding mounting seat, and the second blade pressing limit block is installed in the second vertical guide groove through a second adjusting bolt. The second adjusting bolt is threadedly connected to the second vertical threaded through hole provided on the sliding mounting seat, and the upper and lower ends of the second adjusting bolt respectively pass through the second vertical threaded through hole. The second blade pressing limit block is installed on the lower end of the second adjusting bolt. When the second adjusting bolt is turned, the second blade pressing limit block moves vertically in the vertical direction under the guiding action of the second vertical guide groove.

[0030] The cam is fixedly mounted on a vertical guide slot on the lower side of the sliding mounting seat, and the adjusting bolt is threadedly connected to the vertical threaded through hole, so that the height position of the cam is adjusted in the vertical direction by turning the adjusting bolt. The cam is convenient for tightening or releasing the cam of the turbine blade by turning the adjusting bolt.

[0031] According to an embodiment of the present application, the first contour of the lower length section of the blade body is an arc-shaped protrusion 1, the second contour of the lower length section of the blade body is an arc-shaped protrusion 2, the first lifting limit portion is a concave limiting groove 1, and the second lifting limit portion is a concave limiting groove 2. When the inner side wall of the concave limiting groove 1 fits and stops in contact with the first arc-shaped protrusion, multiple lifting limit contact surfaces can be formed on the first arc-shaped protrusion. When the inner side wall of the concave limiting groove 2 fits and stops in contact with the second arc-shaped protrusion, multiple lifting limit contact surfaces can be formed on the second arc-shaped protrusion. The contour of the upper length section of the blade body is an arc-shaped recessed groove 1, the contour of the upper length section of the blade body is an arc-shaped recessed groove 2, the lower side surface of the clamping and limiting part 1 is an arc-shaped protrusion 3, and the lower side surface of the clamping and limiting part 2 is an arc-shaped protrusion 4. When the arc-shaped protrusion 3 is in contact with the arc-shaped recessed groove 1, it can have multiple clamping and limiting contact surfaces on the inner side wall of the arc-shaped recessed groove 1. When the arc-shaped protrusion 4 is in contact with the arc-shaped recessed groove 2, it can have multiple clamping and limiting contact surfaces on the inner side wall of the arc-shaped recessed groove 2.

[0032] When the inner side wall of the concave limiting groove 1 in this embodiment is fitted with the arc-shaped protrusion 1 and abutted against it, multiple lifting and limiting contact surfaces can be formed on the arc-shaped protrusion 1. When the inner side wall of the concave limiting groove 2 is fitted with the arc-shaped protrusion 2 and abutted against it, multiple lifting and limiting contact surfaces can be formed on the arc-shaped protrusion 2, so that multiple lifting and limiting contact surfaces are formed on the contour of the lower length section of the blade, thereby increasing the contact area of ​​the contour of the lower length section of the blade. Furthermore, when the arc-shaped protrusion 3 in this embodiment is fitted with the arc-shaped concave groove 1 and abutted against it, multiple pressing and limiting contact surfaces can be formed on the inner side wall of the arc-shaped concave groove 1. When the arc-shaped protrusion four fits and stops in contact with the arc-shaped recessed groove two, it can have multiple clamping and limiting contact surfaces on the inner wall of the arc-shaped recessed groove two, thereby forming multiple clamping and limiting contact surfaces on the upper length section contour of the blade body, increasing the contact area for compressing the lower length section contour of the blade body, and in the process of compressing the blade body of the turbine blade, avoiding the small contact area between the lower length section contour of the blade body and the upper length section contour of the blade body to form local pressure and cause deformation of the blade body, thereby improving the reliability of the clamping and limiting of the blade body of the turbine blade, and is beneficial to protecting the blade shape of the blade body of the turbine blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 This is a flow chart of a method for grinding and forming tenon teeth of an aero-engine turbine blade in an embodiment of the present application; Figure 2 This is a schematic diagram of the structure of the clamping device in an embodiment of the present application installed on the angle adjustment pad; Figure 3 for Figure 2 Front view after straightening; Figure 4 for Figure 3 Left view of; Figure 5 This is a structural diagram of the angle adjustment pad in an embodiment of the present application; Figure 6 This is a schematic structural diagram of a clamping device in an embodiment of the present application for clamping and limiting multiple turbine blades; Figure 7 for Figure 6 Schematic diagram of disassembly and assembly of some components.

[0035] In the accompanying drawings, the components represented by the reference numerals are as follows: 1. Angle adjustment pad, 2. Support seat, 3. Blade support limit block 1, 4. Blade support limit block 2, 5. Sliding mounting seat, 6. Turbine blade, 10. Angle adjustment support surface, 11. Stop limit block, 12. Avoidance recessed groove, 13. Installation support protrusion, 20. Vertical support protrusion 1, 21. Vertical support protrusion 2, 22. Installation positioning hole 1, 23. Threaded through hole 1, 24. Stop protrusion 1, 25. Stop protrusion 2, 30. Recessed limit groove 1, 31. Limiting top, 32. Installation positioning pin 1, 33. Locking bolt 1, 40. Recessed limit groove 2, 41. Installation positioning pin 2, 42. Locking bolt 2, 50. Horizontal extension protrusion, 51. Vertical guide groove 1, 52. Vertical threaded through hole 2, 53. Threaded through hole 3, 54. Guide limit groove, 55, blade body clamping limit block one, 56, blade body clamping limit block two, 60, tenon, 61, blade, 101, bolt through hole one, 111, stop surface, 131, bolt avoidance groove, 201, vertical sliding guide groove, 202, stop protrusion three, 203, grinding guide protrusion one, 211, grinding guide protrusion two, 212, threaded hole one, 213, bolt through hole two, 214, stop support protrusion, 501, bolt through hole three, 502, locking bolt three, 521, adjusting bolt one, 522, adjusting bolt two, 531, adjusting bolt three, 551, installation slot one, 552, clamping limit part one, 561, installation slot two, 562, clamping limit part two, 5211, snap-fit ​​protrusion one, 5221, snap-fit ​​protrusion two. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0037] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0039] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0040] According to one aspect of the present application, an embodiment of a method for grinding and forming tenons of turbine blades of aircraft engines is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, or can be performed by an operator to execute the steps or part of the steps shown in the flowchart. Moreover, although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0041] Figure 1 This is a flow chart of a method for grinding and forming tenon teeth of a turbine blade of an aero-engine according to an embodiment of the present application. The method uses a device such as Figures 2 to 7 The grinding machine with the clamping device shown is used for grinding, as shown in Figure 1 As shown, the method includes the following steps: Step S102: Clamp the plurality of turbine blades 6 onto a plurality of blade clamping stations provided on a clamping device mounted on the grinding machine. The clamping device simultaneously clamps and locks the blades 61 of the plurality of turbine blades 6 onto the blade clamping stations, thereby securing the plurality of turbine blades 6 and ensuring that the tenons 60 of the plurality of turbine blades 6 are exposed outside the clamping device. Step S104: grinding the first quasi-mounting positioning portions of the tenons 60 of the plurality of turbine blades 6 fixed by the clamping device using a grinding wheel installed on a grinding machine, so that the first quasi-mounting positioning portions of the tenons 60 of the plurality of turbine blades 6 are respectively ground to form first mounting positioning portions; Step S106, grinding the second quasi-mounting positioning portions of the tenons 60 of the plurality of turbine blades 6 fixed by the clamping device using a grinding wheel installed on the grinding machine, so that the second quasi-mounting positioning portions of the tenons 60 of the plurality of turbine blades 6 are respectively ground to form second mounting positioning portions; In the process of the grinding wheel grinding the first quasi-installation positioning part and the second quasi-installation positioning part of the tenon 60 of multiple turbine blades 6 fixed by the clamping device, the grinding wheel is located on the outside of the clamping device, and the clamping device does not interfere with the grinding wheel.

[0042] In this embodiment, if Figure 1 As shown, in the method for grinding and forming the tenon teeth of aircraft engine turbine blades in this embodiment, the blade bodies 61 of multiple turbine blades 6 are clamped and locked on the blade body clamping station at the same time by a clamping device, so as to fix and position the multiple turbine blades 6, and the fixing position of the turbine blades 6 by the clamping device is at the blade body position of the turbine blade 6, which is beneficial for keeping the clamping device away from the tenon 60 of the turbine blade 6, thereby avoiding the need for the clamping device to fix the tenon 60 of the turbine blade 6, which causes the clamping device to limit and interfere with the grinding of the tenon teeth on the tenon 60, is beneficial for optimizing the structure of the tenon teeth, and is beneficial for meeting the processing requirements of various tenon tooth structures; further, the blade bodies 61 of multiple turbine blades 6 are clamped and locked on the blade body clamping station at the same time by a clamping device, which is beneficial for fixing the multiple turbine blades 6 and grinding the tenons 60 of multiple turbine blades 6, and is beneficial for improving the processing efficiency of grinding the tenons 60 of the tenons 60 of the turbine blades 6.

[0043] In one embodiment of the present application, before grinding the second quasi-installation positioning portions of the tenons 60 of the plurality of turbine blades 6 fixed by the clamping device using a grinding wheel installed on a grinding machine, so that the second quasi-installation positioning portions of the tenons 60 of the plurality of turbine blades 6 are respectively ground to form the second installation positioning portions, the method for grinding and forming the tenon teeth of an aircraft engine turbine blade further includes: By flipping the clamping device over, the multiple turbine blades 6 fixed by the clamping device are flipped over as the clamping device is flipped over, so that the second quasi-installation positioning part of the tenon 60 of the multiple turbine blades 6 fixed by the clamping device is exchanged with the first quasi-installation positioning part.

[0044] In this embodiment, the clamping device is turned over so that the multiple turbine blades 6 fixed by the clamping device are turned over as the clamping device is turned over, so that the first quasi-installation positioning portion of the tenon 60 of the turbine blade 6 is ground by the grinding wheel. After the clamping device is turned over, the second quasi-installation positioning portion of the tenon 60 of the turbine blade 6 is ground by the grinding wheel. There is no need to take out the multiple turbine blades 6 fixed by the clamping device and then fix them separately, which is beneficial to improving the grinding efficiency. In addition, it is also beneficial to reduce the number of grinding wheels that need to be installed on the grinding machine.

[0045] One embodiment of the present application, such as Figure 6and Figure 7 As shown, the clamping device includes: The support base 2 is provided with a plurality of installation avoidance grooves spaced along its length direction, and the plurality of installation avoidance grooves extend along the width direction of the support base 2; The blade support limit seat is provided with a plurality of installation avoidance grooves in a one-to-one correspondence. The blade support limit seat is installed on the support seat 2 and is respectively located in the installation avoidance grooves. The upper side of the blade support limit seat is provided with a plurality of support limit portions for one-to-one matching and supporting the contour of the lower length section of the turbine blade 6. The plurality of support limit portions are arranged at intervals along the length direction of the turbine blade 6, and the plurality of support limit portions can jointly match and support the contours of the multiple blade lower length sections of the turbine blade 6. The blade body pressing limit seat is provided with a plurality of blade body lifting limit seats in a one-to-one correspondence, and the plurality of blade body pressing limit seats are movably mounted on the support seat 2 in a one-to-one correspondence with the plurality of blade body lifting limit seats. The lower side of the blade body pressing limit seat is provided with a plurality of pressing limit parts for fitting and pressing the contour of the upper length section of the blade body of the turbine blade 6 one by one. The plurality of pressing limit parts are arranged at intervals along the length direction of the turbine blade 6, and the plurality of pressing limit parts can jointly fit and press the contours of the upper length sections of the blade body of the turbine blade 6. After the blade body pressing limit seat is moved toward the blade body lifting limit seat, the blade body pressing limit seat is locked. The blade body 61 of the turbine blade 6 located between the plurality of lifting limit parts and the plurality of pressing limit parts can be fixed under the limiting action of the plurality of lifting limit parts and the plurality of pressing limit parts. The plurality of turbine blades 6 are respectively clamped on a plurality of blade body clamping stations provided on a clamping device installed on a grinding machine, and the blade bodies 61 of the plurality of turbine blades 6 are simultaneously clamped and locked on the blade body clamping stations by the clamping device, thereby fixing the plurality of turbine blades 6, including: Multiple turbine blades 6 are respectively placed between multiple lifting limit parts and multiple clamping limit parts, and the blade body clamping limit seat is moved toward the blade body lifting limit seat and then locked, so that the lower side length section contours of the blade body and the upper side length section contours of the multiple turbine blades 6 located between the multiple lifting limit parts and the multiple clamping limit parts are fixed under the limiting action of the multiple lifting limit parts and the multiple clamping limit parts.

[0046] In this embodiment, if Figure 6 and Figure 7As shown, by placing multiple turbine blades 6 respectively between multiple lifting limit parts and multiple pressing limit parts, and then moving the blade body pressing limit seat toward the blade body lifting limit seat and locking the blade body pressing limit seat, it is beneficial to lock the blade body lower length section contour and the multiple blade body upper length section contours of the turbine blade 6 through the multiple lifting limit parts and the multiple pressing limit parts, thereby achieving fixed limitation of the turbine blade 6; further, the multiple lifting limit parts can jointly lock the multiple blade body lower length section contours of the turbine blade 6 The length segment contour is fitted and lifted up to limit the position, and multiple pressing limit parts can jointly fit and press up the upper length segment contours of multiple blade bodies of the turbine blade 6, which is beneficial to increase the contact area between the lifting limit part and the pressing limit part and the blade body 61 of the turbine blade 6, thereby helping to improve the reliability and stability of the lifting limit part and the pressing limit part in locking the blade body 61, and helping to avoid deformation of the blade body 61 of the turbine blade 6 due to excessive local pressure caused by the squeezing of the lifting limit part and the pressing limit part.

[0047] In one embodiment of the present application, a grinding wheel installed on a grinding machine is used to grind a first quasi-mounting positioning portion of a tenon 60 of a plurality of turbine blades 6 fixed by a clamping device, including: According to a first preset grinding amount of the first quasi-installation positioning portions of the tenons 60 of the plurality of turbine blades 6, a current feed grinding amount of a grinding wheel installed on a grinding machine is adjusted, and the first quasi-installation positioning portions of the tenons 60 of the plurality of turbine blades 6 are ground by the grinding wheel in sequence for the first preset grinding amount; The second quasi-installation positioning portion of the tenon 60 of the plurality of turbine blades 6 fixed by the clamping device is ground by a grinding wheel installed on a grinding machine, including: According to the second preset grinding amount of the second quasi-installation positioning part of the tenon 60 of the multiple turbine blades 6, the current feed grinding amount of the grinding wheel installed on the grinding machine is adjusted, and the second quasi-installation positioning part of the tenon 60 of the multiple turbine blades 6 is ground to the second preset grinding amount in sequence through the grinding wheel.

[0048] In this embodiment, if Figure 6 and Figure 7 As shown, the first quasi-installation positioning portion of the tenon 60 of the multiple turbine blades 6 is ground by the grinding wheel in sequence for a first preset grinding amount, and the second quasi-installation positioning portion of the tenon 60 of the multiple turbine blades 6 is ground by the grinding wheel in sequence for a second preset grinding amount, which is beneficial to grinding the multiple turbine blades 6 in sequence, and is beneficial to improving the processing efficiency and improving the consistency of the grinding of the multiple turbine blades 6.

[0049] One embodiment of the present application, such as Figure 6 and Figure 7As shown, multiple turbine blades 6 are respectively clamped on multiple blade clamping stations provided on a clamping device installed on a grinding machine, including: The plurality of turbine blades 6 are respectively placed on a plurality of blade body clamping stations provided on the clamping device on the grinding machine, and the plurality of turbine blades 6 placed on the plurality of blade body clamping stations are locked and fixed by means of locking members, so that the tenons 60 of the plurality of turbine blades 6 locked and fixed on the plurality of blade body clamping stations are tilted upward, and a first angle is formed between a center plane passing through the center of the tenons 60 of the plurality of turbine blades 6 locked and fixed on the plurality of blade body clamping stations and a horizontal plane, wherein the angle of the first angle is any value between 10° and 30°.

[0050] In this embodiment, if Figure 6 and Figure 7 As shown, after the multiple turbine blades 6 placed on multiple blade body clamping stations are locked and fixed by locking parts, the tenons 60 of the turbine blades 6 are inclined, and a first angle is formed between the center plane of the tenons 60 of the multiple turbine blades 6 locked and fixed on multiple blade body clamping stations and the horizontal plane. The angle of the first angle is any value between 10° and 30°, which is conducive to grinding on the tenons 60 of the turbine blades 6 to form tenons with complete guide circles at the roots. When the turbine blades 6 with complete guide circle tenons at the roots are installed on the turbine disk, it is conducive to improving the compactness of the engagement between the tenons and the tooth grooves in the tenon grooves of the turbine disk, thereby improving the reliability and stability of the installation and positioning of the turbine blades 6, and also conducive to improving the reliability and stability of the turbine blades 6 with complete guide circle tenons at the roots when installed on the aircraft engine.

[0051] According to another aspect of the present application, a grinding machine is provided for implementing the above-mentioned method for grinding and forming tenon teeth of a turbine blade of an aero-engine, such as Figures 2 to 7 Shown, including: Bed; Workbench, mounted on the bed; A clamping device is installed on the workbench, and a plurality of blade clamping stations are provided on the clamping device. The plurality of blade clamping stations can clamp and lock the blades 61 of a plurality of turbine blades 6 at the same time; Grinding drive device, installed on the bed; The grinding wheel frame is mounted on the grinding drive device and is located on the upper side of the workbench. The grinding wheel frame is mounted with a grinding wheel facing the tenon 60 of the turbine blade 6 clamped and locked on the blade body clamping station. The grinding wheel can grind the tenon 60 of the turbine blade 6 under the drive of the grinding drive device. The control unit and the grinding driving device are electrically connected to the control unit.

[0052] In this embodiment, if Figures 2 to 7 As shown, the clamping device in this embodiment is installed on the workbench, and a plurality of blade clamping stations are provided on the clamping device. The plurality of blade clamping stations can clamp and lock the blades 61 of a plurality of turbine blades 6 at the same time, so that the blades 61 of a plurality of turbine blades 6 can be clamped and locked on the blade clamping stations at the same time by the clamping device, thereby fixing and positioning a plurality of turbine blades 6, and the fixing position of the turbine blade 6 by the clamping device is at the blade position of the turbine blade 6, which is beneficial for keeping the clamping device away from the tenon 60 of the turbine blade 6, thereby facilitating avoiding the clamping device from being The need to fix the tenon 60 of the turbine blade 6 causes the clamping device to restrict and interfere with the grinding of the tenon on the tenon 60, which is beneficial to the optimization design of the tenon structure and to meet the processing requirements of various tenon structures; further, the blade bodies 61 of multiple turbine blades 6 are clamped and locked on the blade body clamping station at the same time by the clamping device, which is beneficial to fix the multiple turbine blades 6 and grind the tenons 60 of multiple turbine blades 6, and is beneficial to improve the processing efficiency of grinding the tenons on the tenons 60 of the turbine blades 6.

[0053] In this embodiment, the specific structures of the grinding machine bed, worktable, grinding processing drive device and grinding wheel frame are not illustrated in this embodiment. The specific structures of the grinding machine bed, worktable, grinding processing drive device and grinding wheel frame can refer to the existing technology and will not be described in detail here. Furthermore, the control unit can also be adjusted according to the processing requirements on the basis of the existing technology, and will not be described in detail here.

[0054] One embodiment of the present application, such as Figures 2 to 7 As shown, the grinding machine also includes: An angle adjustment pad 1 is installed on a workbench, and an angle adjustment support surface 10 is provided on the angle adjustment pad 1, and a second angle is formed between the angle adjustment support surface 10 and the horizontal plane, wherein the angle of the second angle is any value between 10° and 30°; when the clamping device is installed on the angle adjustment support surface 10, the tenons 60 of the multiple turbine blades 6 locked and fixed on multiple blade clamping stations are tilted upward, and a third angle is formed between the center plane passing through the center of the tenons 60 of the multiple turbine blades 6 and the horizontal plane, and the angle of the third angle is equal to the angle of the second angle.

[0055] In this embodiment, if Figures 2 to 7As shown, by installing an angle adjustment pad 1 on the workbench, when the clamping device is installed on the angle adjustment support surface 10, the angle of the third angle formed between the center plane of the center of the tenon 60 of the multiple turbine blades 6 and the horizontal plane is equal to the angle of the second angle, which is conducive to grinding on the tenon 60 of the turbine blade 6 to form a tenon with a complete guide circle at the root. When the turbine blade 6 with the tenon with a complete guide circle at the root is installed on the turbine disk, it is conducive to improving the compactness of the engagement between the tenon and the tooth groove in the turbine disk tenon, thereby improving the reliability and stability of the installation and positioning of the turbine blade 6, and also conducive to improving the reliability and stability of the turbine blade 6 with the tenon with a complete guide circle at the root when it is installed on the aircraft engine.

[0056] In this embodiment, if Figures 2 to 7 As shown, the bottom of the angle adjustment pad 1 of this embodiment is a horizontal supporting surface, and the upper side of the front part of the angle adjustment pad 1 is provided with an angle adjustment supporting surface 10 inclined from front to back and from high to low, and the angle of the angle adjustment supporting surface 10 relative to the horizontal plane is 25°, and the rear part of the angle adjustment pad 1 is provided with a stop limit block 11, and the front side of the upper end of the stop limit block 11 is provided with an inclined surface inclined from high to low and from back to front, and the upper part of the inclined surface is provided with a stop protrusion, and the front side surface of the stop protrusion forms a stop surface 111, and the stop surface 111 is a finely machined surface, which improves the accuracy of the stop limit between the support seat 2 and the stop surface 111; in addition, the angle of the angle adjustment support surface 10 relative to the horizontal plane in this embodiment can also be designed to an angle of 10°-30° according to needs and obtained by processing.

[0057] Further, such as Figure 4 and Figure 5 As shown, in this embodiment, in order to avoid interference between the lower rear part of the support seat 2 and the stop limit block 11, an avoidance recess groove 12 is opened on the upper side of the angle adjustment pad 1. The avoidance recess groove 12 passes through the angle adjustment pad 1 in the left and right directions. The avoidance recess groove 12 is located between the rear side of the angle adjustment support surface 10 and the front side of the stop limit block 11.

[0058] Further, such as Figure 4 and Figure 5 As shown, in order to facilitate the installation of the angle adjustment pad 1 on the workbench, in this embodiment, mounting support protrusions 13 are respectively connected to the left and right sides of the angle adjustment pad 1, and a bolt avoidance groove 131 is provided on the mounting support protrusion 13, so that the angle adjustment pad 1 can be installed on the workbench by passing the bolts through the bolt avoidance groove 131; in addition, the angle adjustment pad 1 in this embodiment can also be installed on the workbench using other applicable installation methods.

[0059] Further, such as Figure 4 and Figure 5As shown, in this embodiment, in order to facilitate the installation of the clamping device on the angle adjustment support surface 10, a plurality of bolt through holes 101 are provided on the angle adjustment pad 1, and the bolt through holes 101 vertically penetrate the angle adjustment pad 1 in the vertical direction, so that the clamping device can be installed on the angle adjustment support surface 10 by passing bolts through the bolt through holes 101; in this embodiment, two clamping devices are installed on one angle adjustment pad 1, and correspondingly, two bolt through holes 101 are provided on the angle adjustment pad 1, and the number and manner of setting the bolt through holes 101 can also be various, so as to facilitate the reliable installation of the clamping device on the angle adjustment support surface 10.

[0060] One embodiment of the present application, such as Figures 2 to 7 As shown, there are multiple clamping devices, and the multiple clamping devices are linearly arranged along the length direction of the angle adjustment pad 1 and installed on the angle adjustment support surface 10.

[0061] In this embodiment, if Figures 2 to 7 As shown, the present embodiment is provided with a plurality of clamping devices, and the plurality of clamping devices are linearly arranged along the length direction of the angle adjustment pad 1 and installed on the angle adjustment support surface 10, which is conducive to installing a plurality of turbine blades 6 on the plurality of clamping devices respectively, thereby increasing the number of tenons 60 of the turbine blades 6 that can be processed in sequence in one grinding process, and improving the processing efficiency of grinding the tenons 60 of the turbine blades 6 into tenons.

[0062] In this embodiment, if Figures 2 to 7 As shown, the present embodiment specifically provides two clamping devices, and the two clamping devices are linearly arranged in the left and right directions and installed on the angle adjustment support surface 10; in addition, the number of clamping devices can also be three, four, etc. as needed, and when it is necessary to increase the number of clamping devices installed on the angle adjustment support surface 10, the length and structure of the angle adjustment pad 1 can be adjusted accordingly to meet the needs of installing more clamping devices, which will not be repeated here.

[0063] One embodiment of the present application, such as Figures 2 to 7 As shown, the clamping device includes: The support base 2 is provided with a plurality of installation avoidance grooves spaced along its length direction, and the plurality of installation avoidance grooves extend along the width direction of the support base 2; The blade support limit seat is provided with a plurality of installation avoidance grooves in a one-to-one correspondence. The blade support limit seat is installed on the support seat 2 and is respectively located in the installation avoidance grooves. The upper side of the blade support limit seat is provided with a plurality of support limit portions for one-to-one matching and supporting the contour of the lower length section of the turbine blade 6. The plurality of support limit portions are arranged at intervals along the length direction of the turbine blade 6, and the plurality of support limit portions can jointly match and support the contours of the multiple blade lower length sections of the turbine blade 6. The blade body pressing limit seat is provided with a plurality of blade body lifting limit seats corresponding one to one, and the plurality of blade body pressing limit seats are movably installed on the support seat 2 in a one-to-one correspondence with the plurality of blade body lifting limit seats. The lower side of the blade body pressing limit seat is provided with a plurality of pressing limit parts for fitting and pressing the contour of the upper length section of a blade body of the turbine blade 6 one by one. The plurality of pressing limit parts are arranged at intervals along the length direction of the turbine blade 6, and the plurality of pressing limit parts can jointly fit and press the contours of the upper length sections of the blade body of the turbine blade 6. After the blade body pressing limit seat is moved toward the blade body lifting limit seat, the blade body pressing limit seat is locked. The blade body 61 of the turbine blade 6 located between the plurality of lifting limit parts and the plurality of pressing limit parts can be fixed under the limiting action of the plurality of lifting limit parts and the plurality of pressing limit parts.

[0064] In this embodiment, if Figures 2 to 7As shown, the upper side of the blade support limit seat in this embodiment is provided with a plurality of support limit parts for fitting and supporting the contour of the lower length section of the turbine blade 6 one by one, and the plurality of support limit parts can jointly fit and support the contours of the lower length sections of the turbine blade 6; further, the lower side of the blade pressing limit seat is provided with a plurality of clamping limit parts for fitting and pressing the contours of the upper length section of the turbine blade 6 one by one, and the plurality of clamping limit parts can jointly fit and press the contours of the upper length sections of the turbine blade 6, so that multiple turbine blades 6 can be placed respectively between the plurality of support limit parts and the plurality of clamping limit parts, and then the blade pressing limit seat is moved toward the blade support limit seat and the blade pressing limit seat is locked, which is conducive to the use of the plurality of support limit parts and the plurality of The pressing limit parts jointly lock the lower length section contour of the turbine blade 6 and the upper length section contours of multiple blades, thereby achieving fixed limitation of the turbine blade 6; further, multiple lifting limit parts can jointly fit and lift the contours of multiple lower length sections of the turbine blade 6, and multiple pressing limit parts can jointly fit and press the contours of multiple upper length sections of the turbine blade 6, which is beneficial to increase the contact area between the lifting limit parts and the pressing limit parts and the blade 61 of the turbine blade 6, thereby benefiting to improving the reliability and stability of the lifting limit parts and the pressing limit parts in locking the blade 61, and benefiting to avoiding deformation of the blade 61 of the turbine blade 6 due to excessive local pressure caused by the squeezing of the lifting limit parts and the pressing limit parts, and benefiting to protecting the blade shape of the blade 61 of the turbine blade 6.

[0065] In this embodiment, if Figures 2 to 7 As shown, the support seat 2 in this embodiment is provided with two installation avoidance grooves spaced apart along its length direction, and two turbine blades 6 can be clamped and positioned on one support seat 2; in addition, the number of installation avoidance grooves spaced apart along its length direction on the support seat 2 can also be three, four, etc. as needed, and when more installation avoidance grooves are required, the length dimension and structure of the support seat 2 can be adjusted according to the number of installation avoidance grooves, which will not be repeated here.

[0066] Further, such as Figures 2 to 7 As shown, the bottom of the support seat 2 in this embodiment is a rectangular support bottom, and the upper side surface of the support bottom of the support seat 2 is connected with a vertical support protrusion 2 21 in the middle part along the length direction of the support bottom of the support seat 2, and the upper side surface of the support bottom of the support seat 2 is connected with a vertical support protrusion 1 20 at both ends along the length direction of the support bottom of the support seat 2. The vertical support protrusion 1 20 and the vertical support protrusion 2 21 are arranged in parallel, and there is a distance between the vertical support protrusion 1 20 and the vertical support protrusion 2 21 to form an installation avoidance groove.

[0067] Further, such as Figures 2 to 7 As shown, in order to improve the installation accuracy of the support seat 2 when it is installed on the angle adjustment support surface 10, in this embodiment, a stop protrusion 1 24 and a stop protrusion 2 25 are provided at the bottom of the support seat 2, and the stop protrusion 1 24 is provided with two pieces, and the stop protrusion 2 25 is provided with one piece. The stop protrusion 25 is connected to the middle position of the bottom of the support seat 2, and the stop protrusion 1 24 is connected to the left and right ends of the bottom of the support seat 2; the stop protrusion 1 24 and the stop protrusion 2 25 extend in the front and rear directions, and the lower side surfaces of the stop protrusion 1 24 and the stop protrusion 2 25 are finely machined surfaces, and the angle adjustment support surface 10 is also a finely machined surface, which is conducive to the stop protrusion 1 24 and the stop protrusion 2 25 stopping with the angle adjustment support surface 10, reducing the stop contact area between the support seat 2 and the angle adjustment support surface 10, thereby helping to reduce the amount of fine machining on the bottom surface of the support seat 2, and also reducing the cost of fine machining on the bottom surface of the support seat 2.

[0068] In this embodiment, if Figures 2 to 7 As shown, the rear part of the angle adjustment pad 1 in this embodiment is provided with a stop limit block 11, and the front side of the upper end of the stop limit block 11 is provided with an inclined surface inclined from high to low and from back to front, and the upper part of the inclined surface is provided with a stop protrusion, and the front side surface of the stop protrusion forms a stop surface 111; the rear side of the vertical support protrusion 20 in this embodiment is directly opposite to the stop surface 111 and provided with a stop protrusion three 202, and the rear side surface of the stop protrusion three 202 is a finely machined surface; further, the rear side of the vertical support protrusion two 21 in this embodiment is directly opposite to the stop surface 111 and provided with a stop protrusion four, and the rear side surface of the stop protrusion four is a finely machined surface; it is beneficial for the stop protrusion three 202 and the stop protrusion four to stop with the stop surface 111, thereby improving the installation accuracy of the angle adjustment support surface 10 of the support seat 2 installed on the angle adjustment pad 1.

[0069] In this embodiment, if Figures 2 to 7As shown, the front side of the vertical support protrusion 20 in this embodiment is connected with a grinding guide protrusion 203, and the grinding guide protrusion 203 is perpendicular to the vertical support protrusion 20; the front side of the vertical support protrusion 21 in this embodiment is connected with a grinding guide protrusion 211, and the grinding guide protrusion 211 is perpendicular to the vertical support protrusion 21. The grinding guide protrusion 203 and the grinding guide protrusion 211 are arranged flush with each other. In the process of grinding the tenon 60 of the turbine blade 6 on the mounting clamping device for the first time, the grinding guide protrusion 203 and the grinding guide protrusion 211 are processed by the grinding wheel to form a grinding guide profile. In the process of grinding the tenon 60 of the turbine blade 6 starting from the second batch, the grinding guide profile formed on the grinding guide protrusion 203 and the grinding guide protrusion 211 can guide the travel direction of the grinding wheel. It should be noted that, after a batch of tenons 60 of turbine blades 6 are ground to produce complete tenons, the upper and lower sides of the grinding guide protrusions 203 and 211 are respectively processed by grinding wheels to form grinding guide profiles, and the grinding guide profiles are tooth-like structures with a shape similar to that of tenons. The grinding guide protrusions 203 and 211 shown in this embodiment are in a structural state before processing without grinding.

[0070] One embodiment of the present application, such as Figures 2 to 7 As shown, the clamping device also includes: A vertical movable adjustment mechanism is movably connected to the support seat 2, and the blade body clamping limit seat is vertically movably installed on the support seat 2 through the vertical movable adjustment mechanism. The blade body clamping limit seat can have a clamping position and a release position relative to the blade body 61 of the turbine blade 6 located between the multiple lifting limit parts and the multiple clamping limit parts under the adjustment action of the vertical movable adjustment mechanism; when the blade body clamping limit seat is in the clamping position, the blade body 61 of the turbine blade 6 located between the multiple lifting limit parts and the multiple clamping limit parts is fixed under the limiting action of the multiple lifting limit parts and the multiple clamping limit parts; when the blade body clamping limit seat is in the release position, the clamping limit part releases the clamping of the blade body 61 of the turbine blade 6 located between the multiple lifting limit parts and the multiple clamping limit parts.

[0071] In this embodiment, if Figures 2 to 7As shown, the blade body pressing limit seat in this embodiment is vertically mounted on the support seat 2 through a vertical movable adjustment mechanism, which is beneficial for the blade body pressing limit seat to move in the vertical direction relative to the support seat 2 under the adjustment of the vertical movable adjustment mechanism, and is beneficial for driving the blade body pressing limit seat in the vertical direction to move to the pressing position and vertically press the blade body 61 of the turbine blade 6 located between the multiple supporting limit parts and the multiple pressing limit parts, thereby improving the reliability of the multiple supporting limit parts and the multiple pressing limit parts in pressing and fixing the blade body 61 of the turbine blade 6; in addition, when the turbine blade 6 needs to be removed, it is convenient to drive the blade body pressing limit seat to move vertically away from the blade body 61 of the turbine blade 6 through the vertical movable adjustment mechanism, thereby facilitating the removal of the turbine blade 6.

[0072] In this embodiment, if Figures 2 to 7 As shown, the vertical movable adjustment mechanism in this embodiment is specifically an adjusting bolt three 531. The lower end of the adjusting bolt three 531 passes through the threaded through hole three 53 provided on the sliding mounting seat 5 and is threadedly connected to the threaded hole one 212 on the extended boss provided at the lower end of the front side of the vertical support protrusion two 21. By screwing the adjusting bolt three 531, the sliding mounting seat 5 can be driven to move vertically relative to the supporting bottom of the support seat 2; in addition, the vertical movable adjustment mechanism can also adopt other applicable vertical driving parts.

[0073] It should be noted that the "vertical movable installation" in which the blade body pressing limit seat in this embodiment is vertically movably installed on the support seat 2 through a vertical movable adjustment mechanism is based on the support bottom of the support seat 2 as the reference object for the movable direction. After the support seat 2 is installed on the angle adjustment support surface 10 on the angle adjustment pad 1, the entire clamping device is inclined relative to the horizontal plane, and the movable direction of the blade body pressing limit seat is perpendicular to the angle adjustment support surface 10 relative to the angle adjustment support surface 10; further, the "vertical movable installation" in which the blade body pressing limit seat in this embodiment is vertically movably installed on the support seat 2 through a vertical movable adjustment mechanism can also be understood as when the support seat 2 is not installed on the angle adjustment pad 1, the movable direction of the blade body pressing limit seat is the vertical direction.

[0074] One embodiment of the present application, such as Figures 2 to 7 As shown, the blade support limit seat includes: The blade support limit block 1 is mounted on the support base 2 and is located in the installation avoidance groove. The upper side of the blade support limit block 1 is provided with a support limit portion 1 for fitting and limiting the contour 1 of the lower length section of the turbine blade 6. The blade body lifting limit block 2 4 is installed on the support seat 2 opposite to the blade body lifting limit block 1 3 along the width direction of the support seat 2 and is located on one side of the blade body lifting limit block 1 3. The upper side of the blade body lifting limit block 1 3 is provided with a lifting limit part 2 for fitting and lifting the blade body lower side length segment contour 2 of the turbine blade 6. The lifting limit part includes the lifting limit part 1 and the lifting limit part 2, and the blade body lower side length segment contour includes the blade body lower side length segment contour 1 and the blade body lower side length segment contour 2.

[0075] In this embodiment, if Figures 2 to 7 As shown, the lifting and limiting portion 1 in this embodiment can fit and lift the contour 1 of the lower length section of the blade body of the turbine blade 6, which is beneficial to increasing the contact area between the lifting and limiting portion 1 and the contour 1 of the lower length section of the blade body; the lifting and limiting portion 2 can fit and lift the contour 2 of the lower length section of the blade body of the turbine blade 6, which is beneficial to increasing the contact area between the lifting and limiting portion 2 and the contour 2 of the lower length section of the blade body, and the lifting and limiting portion 1 and the lifting and limiting portion 2 jointly lift and limit the blade body 61 along the length direction of the blade body 61 of the turbine blade 6. In the process of pressing the blade body 61 of the turbine blade 6, the small contact area between the contour of the lower length section of the blade body and the lifting and limiting portion is avoided, thereby avoiding local pressure and causing deformation of the blade body 61, thereby improving the reliability of the lifting and limiting portion in lifting and limiting the blade body 61 of the turbine blade 6, and is beneficial to protecting the blade profile of the blade body 61 of the turbine blade 6.

[0076] In this embodiment, if Figures 2 to 7 As shown, the support bottom of the support seat 2 in this embodiment is provided with a plurality of mounting positioning holes 22 and a plurality of threaded through holes 23, and the plurality of mounting positioning holes 22 and the plurality of threaded through holes 23 respectively pass through the support bottom of the support seat 2 vertically and are connected with the mounting avoidance groove, and the bottom of the blade body lifting limit block 3 is provided with a plurality of mounting positioning holes 22, and the bottom of the blade body lifting limit block 3 is provided with a plurality of threaded through holes 23, and a plurality of threaded holes 2 are provided. The mounting positioning hole 22 is installed with a mounting positioning pin 32, and the mounting positioning pin 32 extends upward from the mounting positioning hole 22. In the process of installing the blade body lifting limit block 3 on the support seat 2, the mounting positioning hole 2 is aligned with the mounting positioning pin 32 to realize the positioning of the installation of the blade body lifting limit block 3, and then a locking bolt 33 is used to pass through the threaded through hole 23 and be threadedly connected with the threaded hole 2 to lock the blade body lifting limit block 3 on the support seat 2.

[0077] Further, such as Figures 2 to 7As shown, the support bottom of the support seat 2 in this embodiment is further provided with a plurality of mounting positioning holes three and a plurality of threaded through holes four, and the plurality of mounting positioning holes three and the plurality of threaded through holes four respectively pass through the support bottom of the support seat 2 vertically and are connected with the mounting avoidance groove, and the plurality of mounting positioning holes three and the plurality of threaded through holes four are located on the rear side of the plurality of mounting positioning holes one 22 and the plurality of threaded through holes one 23, and the bottom of the blade support limit block two 4 is directly opposite to the plurality of mounting positioning holes three and is provided with a plurality of mounting positioning holes four, and the bottom of the blade support limit block two 4 is A plurality of threaded holes three are provided opposite to the plurality of threaded through holes four, and an installation positioning pin two 41 is installed in the installation positioning hole three, and the installation positioning pin two 41 extends upwardly from the installation positioning hole three. In the process of installing the blade body lifting limit block two 4 on the support seat 2, the installation positioning hole four is aligned with the installation positioning pin two 41 to realize the positioning of the installation of the blade body lifting limit block two 4, and then the locking bolt two 42 is passed through the threaded through hole four and threadedly connected with the threaded hole three to lock the blade body lifting limit block two 4 on the support seat 2.

[0078] Further, such as Figures 2 to 7 As shown, in this embodiment, there are two mounting positioning holes 22 and two threaded through holes 23, and two mounting positioning holes 3 and two threaded through holes 4, respectively. In addition, the blade support limit block 1 3 and the blade support limit block 2 4 in this embodiment can also be installed on the support seat 2 by other installation methods.

[0079] Furthermore, in order to improve the accuracy and speed of installing and positioning the turbine blade 6 in the fore-aft direction, in this embodiment, a limiting tip 31 is installed on the front side of the blade support limiting block 1 3. During the installation of the turbine blade 6 on the clamping device, the rear side of the tenon 60 of the turbine blade 6 is abutted against the limiting tip 31. The limiting tip 31 can install and position the turbine blade 6 in the fore-aft direction. It should be noted that in the absence of the limiting tip 31, the rear side of the tenon 60 of the turbine blade 6 can also be directly abutted against the front side of the blade support limiting block 1 3 to achieve installation and positioning of the turbine blade 6 in the fore-aft direction. Other installation and positioning methods known in the art can also be used to install and position the turbine blade 6 in the fore-aft direction, so as to facilitate installation and positioning of the turbine blade 6 in the fore-aft direction.

[0080] One embodiment of the present application, such as Figures 2 to 7 As shown, the blade body pressing limit seat includes: A sliding mounting seat 5 is slidably mounted on the supporting seat 2, and the sliding mounting seat 5 can slide in the vertical direction under the drive of the vertical movable adjustment mechanism; The blade body pressing limit block 1 55 is installed on the lower side of the sliding mounting seat 5 opposite the blade body lifting limit block 1 3 and is located in the installation avoidance groove. The lower side of the blade body pressing limit block 1 55 is provided with a blade body pressing portion 1 for fitting and pressing the upper length section profile 1 of the turbine blade 6; The blade body clamping limit block 2 56 is installed on the lower side of the sliding mounting seat 5 opposite the blade body lifting limit block 2 4 along the width direction of the support seat 2 and is located on one side of the blade body clamping limit block 1 55. The lower side of the blade body clamping limit block 2 56 is provided with a clamping limit part 2 562 for fitting and clamping the upper side length segment contour 2 of the turbine blade 6. The clamping limit part includes a clamping limit part 1 552 and a clamping limit part 2 562. The upper side length segment contour of the blade body includes a blade body upper side length segment contour 1 and a blade body upper side length segment contour 2.

[0081] In this embodiment, if Figures 2 to 7 As shown, the blade body pressing portion 1 in this embodiment can fit and press the upper length segment contour 1 of the blade body of the turbine blade 6, which is beneficial to increasing the contact area between the blade body pressing portion 1 and the upper length segment contour 1; the blade body pressing portion 2 can fit and press the upper length segment contour 2 of the blade body of the turbine blade 6, which is beneficial to increasing the contact area between the blade body pressing portion 2 and the upper length segment contour 2 of the blade body, and the blade body pressing portion 1 and the blade body pressing portion 2 jointly press and limit the blade body 61 along the length direction of the blade body 61 of the turbine blade 6. In the process of pressing the blade body 61 of the turbine blade 6, the small contact area between the upper length segment contour of the blade body and the blade body pressing portion is avoided, thereby avoiding local pressure and causing deformation of the blade body 61, thereby improving the reliability of the blade body pressing portion in pressing and limiting the blade body 61 of the turbine blade 6, and is beneficial to protecting the blade shape of the blade body 61 of the turbine blade 6.

[0082] In this embodiment, if Figures 2 to 7 As shown, the supporting bottom of the support seat 2 in this embodiment is provided with a vertical supporting protrusion 1 20 and a vertical supporting protrusion 2 21, and the sliding mounting seat 5 is slidably mounted on the vertical supporting protrusion 1 20 and the vertical supporting protrusion 2 21; specifically, the sliding mounting seat 5 in this embodiment is approximately a rectangular structure, and the two ends of the sliding mounting seat 5 in the length direction are respectively connected with horizontal extension protrusions 50; further, the two vertical supporting protrusions 1 20 are respectively provided with vertical sliding guide grooves 201, and the horizontal extension protrusions 50 extend into the vertical sliding guide grooves 201, and the front and rear sides of the horizontal extension protrusions 50 are respectively fitted and stopped against the inner side walls of the vertical sliding guide grooves 201; further, the rear side of the middle part of the sliding mounting seat 5 in this embodiment is provided with a guide limit groove 54 opposite to the vertical support protrusion 2 21.

[0083] In this embodiment, if Figures 2 to 7As shown, the lower end of the front side of the vertical support protrusion 21 in this embodiment is provided with an extension boss, and the extension boss is provided with a threaded hole 212. Correspondingly, a threaded through hole 3 53 is provided on the sliding mounting seat 5 opposite the threaded hole 212. The vertical movable adjustment mechanism in this embodiment is specifically an adjusting bolt 3 531, which passes downward through the threaded through hole 3 53 and is threadedly connected to the threaded hole 212. By twisting the adjusting bolt 3 531, the adjusting bolt 3 531 can drive the sliding mounting seat 5 to move vertically relative to the supporting bottom of the support seat 2.

[0084] It should be noted that, for turbine blades 6 of different types and specifications, the profiles of the blade body 61 of the turbine blade 6 at different length positions are different; therefore, for different turbine blades 6, the structures of the clamping limit portion 1 552 and the clamping limit portion 2 562 need to be designed according to the specific needs of the turbine blade 6 to be clamped, so that the clamping limit portion 1 552 and the clamping limit portion 2 562 can be fitted and pressed with the blade body 61 of the turbine blade 6; in addition, there are also multiple options for the blade body upper length segment profile 1 and the blade body upper length segment profile 2 in this embodiment.

[0085] Furthermore, it should be noted that the sliding mounting seat 5 in this embodiment can slide in the vertical direction under the drive of the vertical movable adjustment mechanism, and the "sliding in the vertical direction" refers to the support bottom of the support seat 2 as the reference object for the movable direction. After the support seat 2 is installed on the angle adjustment support surface 10 on the angle adjustment pad 1, the entire clamping device is inclined relative to the horizontal plane, and the movable direction of the blade pressing limit seat is perpendicular to the angle adjustment support surface 10 relative to the angle adjustment support surface 10; further, the sliding mounting seat 5 in this embodiment can slide in the vertical direction under the drive of the vertical movable adjustment mechanism, and the "sliding in the vertical direction" can also be understood as when the support seat 2 is not installed on the angle adjustment pad 1, the movable direction of the sliding mounting seat 5 is the vertical direction.

[0086] In this embodiment, if Figure 4 and Figure 5 As shown, in this embodiment, in order to facilitate the installation of the clamping device on the angle adjustment support surface 10, two bolt through holes 101 are provided on the angle adjustment pad 1, and the bolt through hole 101 vertically penetrates the angle adjustment pad 1 in the vertical direction, and a bolt through hole 213 is provided on the vertical support protrusion 21 opposite to the bolt through hole 101, so that the clamping device can be installed on the angle adjustment support surface 10 by passing the bolt through hole 101 and the bolt through hole 213 and threadedly connected with the nut; in addition, the way of installing the clamping device on the angle adjustment support surface 10 can also adopt other installation methods.

[0087] Furthermore, a stop support protrusion 214 is provided at the upper end of the vertical support protrusion 21 in this embodiment, and the top surface of the stop support protrusion 214 is flush with the top surface of the vertical support protrusion 1 20, so that when the clamping device is turned over for installation, the top surface of the stop support protrusion 214 and the top surface of the vertical support protrusion 1 20 are inverted and stop against the angle adjustment support surface 10.

[0088] One embodiment of the present application, such as Figures 2 to 7 As shown, a vertical guide groove 51 is provided on the lower side of the sliding mounting seat 5, and a blade pressing limit block 55 is installed in the vertical guide groove 51 via an adjusting bolt 521. The adjusting bolt 521 is threadedly connected to a vertical threaded through hole 1 provided on the sliding mounting seat 5. The upper and lower ends of the adjusting bolt 521 respectively pass through the vertical threaded through hole 1. The blade pressing limit block 55 is installed on the lower end of the adjusting bolt 521. When the adjusting bolt 521 is turned, the blade pressing limit block 55 moves vertically in the vertical direction under the guidance of the vertical guide groove 51. A vertical guide groove 2 is provided on the lower side of the sliding mounting seat 5, and a blade body clamping limit block 2 56 is installed in the vertical guide groove 2 through an adjusting bolt 2 522. The adjusting bolt 2 522 is threadedly connected to the vertical threaded through hole 2 52 provided on the sliding mounting seat 5, and the upper and lower ends of the adjusting bolt 2 522 respectively pass through the vertical threaded through hole 2 52. The blade body clamping limit block 2 56 is installed on the lower end of the adjusting bolt 2 522. When the adjusting bolt 2 522 is turned, the blade body clamping limit block 2 56 moves vertically in the vertical direction under the guiding action of the vertical guide groove 2.

[0089] In this embodiment, if Figures 2 to 7As shown, the blade pressing limit block 1 55 in this embodiment is installed in the vertical guide groove 1 51 on the lower side of the sliding mounting seat 5 by means of an adjusting bolt 1 521. The adjusting bolt 1 521 is threadedly connected to the vertical threaded through hole 1, so that the height position of the blade pressing limit block 1 55 can be adjusted in the vertical direction by turning the adjusting bolt 1 521, so that the blade pressing limit block 1 55 can press or release the blade 61 of the turbine blade 6. Similarly, the blade pressing limit block 2 56 in this embodiment is adjusted by means of the adjusting bolt 1 Bolt 2 522 is installed in vertical guide groove 2 on the lower side of the sliding mounting seat 5. Adjusting bolt 2 522 is threadedly connected to vertical threaded through hole 2 52. By turning adjusting bolt 2 522, the height position of blade body pressing limit block 2 56 can be adjusted in the vertical direction. This also facilitates the blade body pressing limit block 2 56 to press or release the blade body 61 of the turbine blade 6, thereby facilitating the compression or release of the blade body 61 of the turbine blade 6 via blade body pressing limit block 1 55 and blade body pressing limit block 2 56. Furthermore, in this embodiment, there are two vertical threaded through holes 1 and two vertical threaded through holes 52, and the two vertical threaded through holes 1 are located in front of the two vertical threaded through holes 2 52.

[0090] In this embodiment, if Figures 2 to 7 As shown, the vertical guide groove 51 in this embodiment is opened at the front part of the lower side of the sliding mounting seat 5, and the vertical guide groove 51 is a rectangular hollow structure. The vertical guide groove 51 passes through the sliding mounting seat 5 in the left and right directions, and the upper end of the blade body pressing limit block 55 is provided with a mounting slot 551; further, the sliding mounting seat 5 is provided with two vertical threaded through holes 1 in the vertical direction opposite to the mounting slot 1551; further, the lower end of the adjusting bolt 521 is provided with a clamping protrusion 5211, and the adjusting bolt 521 is threadedly connected to the vertical threaded through hole 1, and the adjusting bolt 521 is turned so that the lower end of the adjusting bolt 521 extends downward to the mounting hole. The blade body pressing stop block 55 is inserted into the slot 551, and the engaging protrusion 5211 is then engaged with the mounting slot 551. The adjusting bolt 521 is then turned in the opposite direction, so that the upper portion of the blade body pressing stop block 55 is received in the vertical guide slot 51, and the front and rear side surfaces of the upper portion of the blade body pressing stop block 55 are respectively abutted against the front and rear side walls of the vertical guide slot 51. When it is necessary to turn the adjusting bolt 521 downward to drive the blade body pressing stop block 55 downward to press the blade body 61 of the turbine blade 6, the vertical guide slot 51 guides and limits the downward movement of the blade body pressing stop block 55, facilitating adjustment of the vertical height position of the blade body pressing stop block 55. It should be noted that the "vertical direction" in this embodiment is understood to be the reference direction when the support base 2 is not installed on the angle adjustment pad 1.

[0091] Furthermore, the second vertical guide groove in this embodiment is provided at the rear portion of the lower side of the sliding mounting seat 5, and the second vertical guide groove penetrates the sliding mounting seat 5 in the left-right direction. The upper end of the blade body pressing limit block 56 is provided with a second mounting slot 561; further, the sliding mounting seat 5 is provided with two second vertical threaded through holes 52 in the vertical direction opposite to the second mounting slot 561; further, the lower end of the second adjusting bolt 522 is provided with a second clamping protrusion 5221, and the second adjusting bolt 522 is threadedly connected to the second vertical threaded through hole 52, and the second adjusting bolt 522 is screwed so that the lower end of the second adjusting bolt 522 extends downwardly out of the second mounting slot 56. 1, then snap the second engaging protrusion 5221 into the second mounting slot 561, and then reversely turn the second adjusting bolt 522 so that the upper portion of the second blade pressing limit block 56 is received in the second vertical guide slot, and the front side surface and the rear side surface of the upper portion of the second blade pressing limit block 56 respectively abut against the front side wall and the rear side wall of the second vertical guide slot. When it is necessary to turn the second adjusting bolt 522 downward to drive the second blade pressing limit block 56 to move downward to press the blade 61 of the turbine blade 6, the second vertical guide slot guides and limits the downward movement of the second blade pressing limit block 56, facilitating adjustment of the vertical height position of the second blade pressing limit block 56. It should be noted that the structure of the second vertical guide slot in this embodiment is the same as that of the first vertical guide slot 51, and the structure of the second vertical guide slot and the structure of the first vertical guide slot 51 can also be set to different structures.

[0092] In this embodiment, if Figures 2 to 7 As shown, a threaded through hole five is provided on the vertical support protrusion 20, and the threaded through hole five is vertically opened on the vertical support protrusion 20 and is connected with the vertical sliding guide groove 201. Correspondingly, a bolt through hole three 501 is provided on the horizontal extension protrusion 50 opposite to the threaded through hole five. The horizontal extension protrusion 50 can be locked by a locking bolt three 502. Specifically, the locking bolt three 502 passes through the bolt through hole three 501 and is threadedly connected to the threaded through hole five.

[0093] In this embodiment, if Figures 2 to 7As shown, by clamping the turbine blade 6 between the blade body lifting limit block 1 3 and the blade body lifting limit block 2 4 provided on the clamping device installed on the grinding machine, and then screwing the adjusting bolt 3 531, the sliding mounting seat 5 can be driven downward by the adjusting bolt 3 531 until the blade body clamping limit block 1 55 and the blade body clamping limit block 2 56 clamp the turbine blade 6, and then the turbine blade 6 is further locked and fixed by screwing the locking bolt 3 502, thereby improving the reliability of locking and fixing the turbine blade 6. It should be noted that the height positions of the blade body clamping limit block 1 55 and the blade body clamping limit block 2 56 can be pre-adjusted as needed, so that by turning the adjusting bolt 3 531, the blade body clamping limit block 1 55 and the blade body clamping limit block 2 56 can be respectively fitted with the blade body side length segment contour 1 and the blade body side length segment contour 2 to achieve locking and fixing of the two turbine blades 6; further, the adjusting bolt 3 531 is located in the middle position of the two installation avoidance grooves. In the process of turning the adjusting bolt 3 531 to drive the sliding mounting seat 5 to clamp the two turbine blades 6, the consistency of the pressure on the two turbine blades 6 is high, thereby improving the consistency of the clamping of the two turbine blades 6, which is beneficial to improving the consistency of the grinding processing of the two turbine blades 6.

[0094] One embodiment of the present application, such as Figures 2 to 7 As shown, the first contour of the lower length section of the blade body is an arc-shaped protrusion 1, the second contour of the lower length section of the blade body is an arc-shaped protrusion 2, the first lifting and limiting portion is a recessed limiting groove 1 30, and the second lifting and limiting portion is a recessed limiting groove 2 40. When the inner side wall of the recessed limiting groove 1 fits and stops in contact with the arc-shaped protrusion 1, multiple lifting and limiting contact surfaces can be formed on the arc-shaped protrusion 1. When the inner side wall of the recessed limiting groove 2 40 fits and stops in contact with the arc-shaped protrusion 2, multiple lifting and limiting contact surfaces can be formed on the arc-shaped protrusion 2. The contour of the upper length section of the blade body is an arc-shaped recessed groove one, the contour of the upper length section of the blade body is an arc-shaped recessed groove two, the lower side surface of the clamping limit part one 552 is an arc-shaped protrusion three, and the lower side surface of the clamping limit part two 562 is an arc-shaped protrusion four. When the arc-shaped protrusion three is in fit and stop contact with the arc-shaped recessed groove one, it can have multiple clamping and limiting contact surfaces on the inner side wall of the arc-shaped recessed groove one. When the arc-shaped protrusion four is in fit and stop contact with the arc-shaped recessed groove two, it can have multiple clamping and limiting contact surfaces on the inner side wall of the arc-shaped recessed groove two.

[0095] In this embodiment, if Figures 2 to 7As shown, when the inner side wall of the recessed limiting groove 1 30 in this embodiment is fitted with the arc-shaped protrusion 1 and abutted against it, multiple lifting and limiting contact surfaces can be formed on the arc-shaped protrusion 1; when the inner side wall of the recessed limiting groove 2 40 is fitted with the arc-shaped protrusion 2 and abutted against it, multiple lifting and limiting contact surfaces can be formed on the arc-shaped protrusion 2, thereby forming multiple lifting and limiting contact surfaces on the contour of the lower length section of the blade, thereby increasing the contact area of ​​the contour of the lower length section of the blade; further, when the arc-shaped protrusion 3 in this embodiment is fitted with the arc-shaped recessed groove 1 and abutted against it, multiple pressing and limiting contact surfaces can be formed on the inner side wall of the arc-shaped recessed groove 1, thereby increasing the contact area of ​​the contour of the lower length section of the blade; further, when the arc-shaped protrusion 3 in this embodiment is fitted with the arc-shaped recessed groove 1 and abutted against it, multiple pressing and limiting contact surfaces can be formed on the inner side wall of the arc-shaped recessed groove 1, thereby increasing the contact area of ​​the contour of the lower length section of the blade; further, When the protrusion four fits and stops in contact with the arc-shaped recessed groove two, it can provide the inner wall of the arc-shaped recessed groove two with multiple clamping and limiting contact surfaces, thereby forming multiple clamping and limiting contact surfaces on the upper length section contour of the blade body, increasing the contact area of ​​the clamping lower length section contour of the blade body, and in the process of clamping the blade body 61 of the turbine blade 6, avoiding the deformation of the blade body 61 caused by the small contact area between the lower length section contour of the blade body and the upper length section contour, thereby improving the reliability of the clamping and limiting of the blade body 61 of the turbine blade 6, and is beneficial to protecting the blade shape of the blade body 61 of the turbine blade 6.

[0096] In this embodiment, if Figures 2 to 7 As shown, the specific structural contours of the recessed limiting groove 1 30 and the recessed limiting groove 2 40 in this embodiment can be designed according to the contours of the upper length segment contour 1 and the upper length segment contour 2 of the blade body that need to be supported and lifted; the arc-shaped protrusion 3 and the arc-shaped protrusion 4 are both arc-shaped surfaces, and the specific structural contours of the arc-shaped protrusion 3 and the arc-shaped protrusion 4 can be designed according to the contours of the upper length segment contour 1 and the upper length segment contour 2 of the blade body that need to be pressed and limited.

[0097] It should be noted that the turbine blade 6 illustrated in the present embodiment is a small blade. The illustrated turbine blade 6 is used to more intuitively describe the present application. The clamping device in the present embodiment is not limited to clamping the illustrated turbine blade 6. When it is necessary to clamp turbine blades 6 of other specifications or types, the clamping device can be adaptively optimized on the basis of the present application to achieve this. In addition, there are many types and specifications of turbine blades 6, and there are also many blade bodies 61 of turbine blades 6. The structures of the arc-shaped protrusion three, arc-shaped protrusion four, recessed limit groove one 30 and recessed limit groove two 40 in the present embodiment can be adjusted according to the specific contour of the blade body 61 of the turbine blade 6.

[0098] In addition, in addition to the technical solutions disclosed in this embodiment, the turbine blades 6, control unit, other structures of the grinder and their working principles in the present invention can refer to the conventional technical solutions in this technical field. However, these conventional technical solutions are not the focus of the present invention and will not be described in detail herein.

[0099] It should be noted that the term "including" and its variations used in the embodiments of the present application are open inclusions, that is, "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". The modifications of "one" and "multiple" mentioned in the embodiments of the present application are illustrative and not restrictive. Those skilled in the art should understand that unless the context clearly indicates otherwise, it should be understood as "one or more".

[0100] The term "embodiment" in this specification refers to specific features, structures, or characteristics described in conjunction with the embodiment that can be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor does it mean that it is mutually exclusive with other embodiments and is independent or optional. The various embodiments in this specification are described in a related manner, and the same or similar parts between the various embodiments are referenced to each other. In particular, for the embodiments of the device, equipment, and system, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts are referred to the partial description of the method embodiment.

[0101] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A method for grinding and forming tenon teeth of aircraft engine turbine blades, characterized in that: The method comprises: Clamping the plurality of turbine blades respectively on a plurality of blade body clamping stations provided on a clamping device installed on a grinding machine, and simultaneously clamping and locking the blade bodies of the plurality of turbine blades on the blade body clamping stations by the clamping device, thereby securing the plurality of turbine blades and ensuring that the tenons of the plurality of turbine blades are exposed outside the clamping device; Grinding the first quasi-mounting positioning portions of the tenons of the plurality of turbine blades fixed by the clamping device using a grinding wheel installed on the grinding machine, so that the first quasi-mounting positioning portions of the tenons of the plurality of turbine blades are respectively ground to form first mounting positioning portions; Grinding the second quasi-mounting positioning portions of the tenons of the plurality of turbine blades fixed by the clamping device by the grinding wheel installed on the grinding machine, so that the second quasi-mounting positioning portions of the tenons of the plurality of turbine blades are respectively ground to form second mounting positioning portions; In which, when the grinding wheel grinds the first quasi-mounting positioning part and the second quasi-mounting positioning part of the tenon of the multiple turbine blades fixed by the clamping device, the grinding wheel is located on the outside of the clamping device, and the clamping device does not interfere with the grinding wheel.

2. The method according to claim 1, characterized in that Before grinding the second quasi-installation positioning portions of the tenons of the plurality of turbine blades fixed by the clamping device using the grinding wheel mounted on the grinding machine so that the second quasi-installation positioning portions of the tenons of the plurality of turbine blades are respectively ground to form the second installation positioning portions, the method further includes: By turning over the clamping device, the multiple turbine blades fixed by the clamping device are turned over as the clamping device is turned over, so that the second quasi-installation positioning portion of the tenon of the multiple turbine blades fixed by the clamping device is exchanged with the first quasi-installation positioning portion.

3. The method according to claim 1, characterized in that The clamping device comprises: A support base, wherein a plurality of installation avoidance grooves are provided on the support base at intervals along the length direction thereof, and the plurality of installation avoidance grooves extend along the width direction of the support base; A blade support and limit seat is provided with a plurality of installation avoidance grooves in a one-to-one correspondence, the blade support and limit seat is installed on the support seat and is respectively located in the installation avoidance grooves, the upper side of the blade support and limit seat is provided with a plurality of support and limit portions for one-to-one corresponding to the contour of the lower length section of the blade of the turbine blade to perform support and limit, the plurality of support and limit portions are arranged at intervals along the length direction of the turbine blade, and the plurality of support and limit portions can jointly perform support and limit on the contours of the multiple lower length sections of the blade of the turbine blade; The blade body pressing limit seat is provided with a plurality of blade body supporting limit seats in a one-to-one correspondence, and the plurality of blade body pressing limit seats are movably mounted on the support seat in a one-to-one correspondence with the plurality of blade body supporting limit seats. The lower side of the blade body pressing limit seat is provided with a plurality of pressing limit parts for fitting and pressing the contour of the upper length section of one blade body of the turbine blade one by one. The plurality of pressing limit parts are spaced apart along the length direction of the turbine blade, and the plurality of pressing limit parts can jointly fit and press the contours of the upper length sections of the blade body of the turbine blade. After the blade body pressing limit seat is moved toward the blade body supporting limit seat, the blade body pressing limit seat is locked, and the blade body of the turbine blade located between the plurality of supporting limit parts and the plurality of pressing limit parts can be fixed under the limiting action of the plurality of supporting limit parts and the plurality of pressing limit parts; The method comprises: clamping the plurality of turbine blades on a plurality of blade body clamping stations provided on a clamping device installed on a grinding machine; and simultaneously clamping and locking the blade bodies of the plurality of turbine blades on the blade body clamping stations by the clamping device to achieve fixing of the plurality of turbine blades, including: The plurality of turbine blades are respectively placed between the plurality of the lifting limit parts and the plurality of the pressing limit parts, the blade body pressing limit seat is moved toward the blade body lifting limit seat, and then the blade body pressing limit seat is locked, so that the blade body lower side length section contours and the blade body upper side length section contours of the plurality of turbine blades located between the plurality of the lifting limit parts and the plurality of the pressing limit parts are fixed under the limiting action of the plurality of the lifting limit parts and the plurality of the pressing limit parts.

4. The method according to claim 1, wherein The grinding process of the first quasi-installation positioning portions of the tenons of the plurality of turbine blades fixed by the clamping device by using a grinding wheel installed on the grinding machine includes: According to a first preset grinding amount of the first quasi-mounting positioning portions of the tenons of the plurality of turbine blades, a current feed grinding amount of the grinding wheel installed on the grinding machine is adjusted, and the first quasi-mounting positioning portions of the tenons of the plurality of turbine blades are ground by the grinding wheel in sequence by the first preset grinding amount; Grinding the second quasi-installation positioning portions of the tenons of the plurality of turbine blades fixed by the clamping device by the grinding wheel installed on the grinding machine includes: According to the second preset grinding amount of the second quasi-mounting positioning part of the tenon of the multiple turbine blades, the current feed grinding amount of the grinding wheel installed on the grinding machine is adjusted, and the second quasi-mounting positioning part of the tenon of the multiple turbine blades is ground to the second preset grinding amount in sequence through the grinding wheel.

5. The method according to claim 1, wherein The method of clamping the plurality of turbine blades respectively on a plurality of blade clamping stations provided on a clamping device installed on a grinding machine includes: The plurality of turbine blades are respectively placed on the plurality of blade body clamping stations provided on the clamping device on the grinding machine, and the plurality of turbine blades placed on the plurality of blade body clamping stations are locked and fixed by locking members, so that the tenons of the plurality of turbine blades locked and fixed on the plurality of blade body clamping stations are tilted upward, and a first angle is formed between a center plane passing through the center of the tenons of the plurality of turbine blades locked and fixed on the plurality of blade body clamping stations and a horizontal plane, wherein the angle of the first angle is any value between 10° and 30°.

6. A grinding machine for implementing the method according to any one of claims 1 to 5, characterized in that: include: Bed; a workbench, mounted on the bed; The clamping device is mounted on the workbench, and is provided with a plurality of blade clamping stations, which can clamp and lock the blades of a plurality of turbine blades at the same time; A grinding drive device is mounted on the bed; a grinding wheel frame, mounted on the grinding drive device and located on the upper side of the workbench, the grinding wheel frame being mounted opposite to the tenon of the turbine blade clamped and locked on the blade body clamping station, the grinding wheel being capable of grinding the tenon of the turbine blade under the drive of the grinding drive device; A control unit is provided, wherein the grinding driving device is electrically connected to the control unit.

7. The grinding machine according to claim 6, characterized in that Also includes: An angle adjustment pad is installed on the workbench, and an angle adjustment support surface is provided on the angle adjustment pad, and a second angle is formed between the angle adjustment support surface and the horizontal plane, wherein the angle of the second angle is any value between 10° and 30°; when the clamping device is installed on the angle adjustment support surface, the tenons of the multiple turbine blades locked and fixed on the multiple blade clamping stations are tilted upward, and a third angle is formed between the center plane of the tenons passing through the centers of the multiple turbine blades and the horizontal plane, and the angle of the third angle is equal to the angle of the second angle.

8. The grinding machine according to claim 7, characterized in that There are multiple clamping devices, and the multiple clamping devices are linearly arranged along the length direction of the angle adjustment pad and installed on the angle adjustment support surface.

9. The grinding machine according to claim 6, wherein: The clamping device comprises: A support base, wherein a plurality of installation avoidance grooves are provided on the support base at intervals along the length direction thereof, and the plurality of installation avoidance grooves extend along the width direction of the support base; A blade support and limit seat is provided with a plurality of installation avoidance grooves in a one-to-one correspondence, the blade support and limit seat is installed on the support seat and is respectively located in the installation avoidance grooves, the upper side of the blade support and limit seat is provided with a plurality of support and limit portions for one-to-one corresponding to the contour of the lower length section of the blade of the turbine blade to perform support and limit, the plurality of support and limit portions are arranged at intervals along the length direction of the turbine blade, and the plurality of support and limit portions can jointly perform support and limit on the contours of the multiple lower length sections of the blade of the turbine blade; The support frame is fixed with a plurality of support members, and the support frame is fixed with a plurality of support members on the support frame.

10. The grinding machine according to claim 9, characterized in that The clamping device also includes: The cam is fixed to the support frame when the cam is in a closed position and the cam is in a closed position, and the cam is fixed to the support frame when the cam is in a closed position and the cam is in a closed position.

11. The grinding machine according to claim 10, characterized in that The blade support limit seat includes: a blade support limit block 1, the blade support limit block 1 being mounted on the support seat and located in the mounting avoidance groove, the upper side of the blade support limit block 1 being provided with a support limit portion 1 for fitting and supporting a profile 1 of a lower length section of the turbine blade; The blade body lifting limit block 2 is installed on the support seat opposite to the blade body lifting limit block 1 along the width direction of the support seat and is located on one side of the blade body lifting limit block 1. The upper side of the blade body lifting limit block 1 is provided with a lifting limit part 2 for fitting and lifting the blade body lower side length section contour 2 of the turbine blade. The lifting limit part includes the lifting limit part 1 and the lifting limit part 2, and the blade body lower side length section contour includes the blade body lower side length section contour 1 and the blade body lower side length section contour 2.

12. The grinding machine according to claim 11, characterized in that The blade body pressing limit seat includes: A sliding mounting seat, slidably mounted on the support seat, and capable of sliding in a vertical direction under the drive of the vertical movable adjustment mechanism; a blade body pressing limit block 1, the blade body pressing limit block 1 being mounted on the lower side of the sliding mounting seat opposite to the blade body lifting limit block 1 and being located in the mounting avoidance groove; a blade body pressing portion 1 being provided on the lower side of the blade body pressing limit block 1 for fitting and pressing a contour 1 of an upper length section of the turbine blade; The blade body clamping limit block 2 is installed on the lower side of the sliding mounting seat opposite to the blade body lifting limit block 2 along the width direction of the support seat and is located on one side of the blade body clamping limit block 1. The lower side of the blade body clamping limit block 2 is provided with a clamping limit part 2 for fitting and clamping the upper length segment contour 2 of the turbine blade. The clamping limit part includes the clamping limit part 1 and the clamping limit part 2, and the upper length segment contour of the blade body includes the upper length segment contour 1 and the upper length segment contour 2 of the blade body.

13. The grinding machine according to claim 12, wherein: A vertical guide groove is provided on the lower side of the sliding mounting seat, and the blade pressing limit block is installed in the vertical guide groove through an adjusting bolt. The adjusting bolt is threadedly connected to a vertical threaded through hole provided on the sliding mounting seat. The upper and lower ends of the adjusting bolt respectively pass through the vertical threaded through hole. The blade pressing limit block is installed on the lower end of the adjusting bolt. When the adjusting bolt is turned, the blade pressing limit block moves vertically in the vertical direction under the guidance of the vertical guide groove. A second vertical guide groove is provided on the lower side of the sliding mounting seat, and the second blade pressing limit block is installed in the second vertical guide groove through a second adjusting bolt. The second adjusting bolt is threadedly connected to the second vertical threaded through hole provided on the sliding mounting seat, and the upper and lower ends of the second adjusting bolt respectively pass through the second vertical threaded through hole. The second blade pressing limit block is installed on the lower end of the second adjusting bolt. When the second adjusting bolt is turned, the second blade pressing limit block moves vertically in the vertical direction under the guiding action of the second vertical guide groove.

14. The grinding machine according to claim 12, wherein: The first contour of the lower length section of the blade body is an arc-shaped protrusion 1, the second contour of the lower length section of the blade body is an arc-shaped protrusion 2, the first lifting limit portion is a concave limiting groove 1, and the second lifting limit portion is a concave limiting groove 2. When the inner side wall of the concave limiting groove 1 fits and stops in contact with the first arc-shaped protrusion, multiple lifting limit contact surfaces can be formed on the first arc-shaped protrusion. When the inner side wall of the concave limiting groove 2 fits and stops in contact with the second arc-shaped protrusion, multiple lifting limit contact surfaces can be formed on the second arc-shaped protrusion. The contour of the upper length section of the blade body is an arc-shaped recessed groove 1, the contour of the upper length section of the blade body is an arc-shaped recessed groove 2, the lower side surface of the clamping and limiting part 1 is an arc-shaped protrusion 3, and the lower side surface of the clamping and limiting part 2 is an arc-shaped protrusion 4. When the arc-shaped protrusion 3 is in contact with the arc-shaped recessed groove 1, it can have multiple clamping and limiting contact surfaces on the inner side wall of the arc-shaped recessed groove 1. When the arc-shaped protrusion 4 is in contact with the arc-shaped recessed groove 2, it can have multiple clamping and limiting contact surfaces on the inner side wall of the arc-shaped recessed groove 2.

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