Welding tooling for fan impeller blades

Abstract

The present invention discloses a welding tool for fan impeller blades, and relates to the technical field of impeller blade welding, comprising a frame, on which a rotating device and a lifting device are arranged in sequence from bottom to top, the rotating device is arranged with a fixing device, a connecting seat is arranged at the end of the lifting device, a connecting shaft is rotatably connected to the connecting seat, and a detachable movable sleeve on the connecting shaft is provided with a plurality of blade adjustment structures. The present invention arranges a plurality of detachable blade adjustment structures so that the first blade clamping structure corresponding thereto can also be disassembled, so that the blades can be clamped and fixed before being installed on the connecting shaft, and the plurality of second blade clamping structures on the blade fixing structure have sufficient space when clamping and fixing the blades, thereby reducing the difficulty of installation, the plurality of first blade clamping structures and the plurality of second blade clamping structures all extend to the same position along the axial direction of the connecting shaft to clamp and fix the blades, so that the peripheral side of the rear disc is unobstructed, and welding is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of impeller blade welding, and in particular to welding tooling for fan impeller blades. Background Art

[0002] A centrifugal fan is a machine that relies on input mechanical energy to increase gas pressure and discharge gas. It is a driven fluid machine, mainly composed of a casing, a main shaft, an impeller, a bearing transmission mechanism and a motor. In actual production, the impeller needs to be welded before it can be formed, and the blades need to be welded to the positioning rear disk during welding.

[0003] In traditional technology, positioning welding is generally performed by manual marking, but displacement is prone to occur during the welding process, and the verticality of the blade welding cannot be guaranteed. The existing utility model patent with authorization announcement number CN210789795U discloses a blade welding tool for processing centrifugal fan impellers. The rear disc positioning part and the blade positioning part cooperate to prevent the positioning rear disc and the blade from being easily displaced during welding, thereby improving the welding accuracy and welding efficiency. However, when this solution is used, the blades and the structure for fixing the blades are both located in the annular body. Since the number of blades and the structure for fixing the blades is large, the installation space of the blades is relatively small, which makes the installation process more difficult and hinders the welding work. Summary of the invention

[0004] The purpose of the present invention is to provide a welding tool for fan impeller blades to solve the technical problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0006] A welding tool for fan impeller blades, comprising a frame, on which a rotating device and a lifting device are sequentially arranged from bottom to top, a fixing device for fixing a rear disc is arranged on the rotating device, a connecting seat is arranged at the end of the lifting device, a connecting shaft is rotatably connected to the connecting seat, a detachable movable sleeve on the connecting shaft is provided with a plurality of blade adjustment structures, and the plurality of blade adjustment structures are sequentially arranged along the axis of the connecting shaft, each of the blade adjustment structures is provided with a plurality of first blade clamping structures, a blade fixing structure is arranged at the end of the connecting shaft, a limiting structure is jointly provided for the blade fixing structure and the plurality of blade adjustment structures, and the limiting structure is used to fix the plurality of blade adjustment structures, and a plurality of second blade clamping structures are provided on the blade fixing structure;

[0007] Among them, the multiple first blade clamping structures and the multiple second blade clamping structures are evenly distributed around the axis of the connecting shaft and are all used to fix blades. The blades fixed by the multiple first blade clamping structures and the blades fixed by the multiple second blade clamping structures are at the same height.

[0008] As a preferred solution of the present invention, the blade adjustment structure includes two semicircular sleeves, and the semicircular sleeves are combined into a circular sleeve by bolts and are used for sliding sleeves on the connecting shaft. A plurality of extension plates are evenly arranged on the circumferential side of the circular sleeve, each of the extension plates is vertically provided with a connecting plate, each of the connecting plates is provided with a support plate, and a plurality of the first blade clamping structures are arranged on the corresponding support plates.

[0009] As a preferred solution of the present invention, the blade fixing structure includes a fixing seat fixedly arranged at the end of the connecting shaft, and a plurality of fixing plates parallel to the extension plate are evenly arranged on the circumferential side of the fixing seat, each of the fixing plates is vertically provided with a support plate parallel to the connecting plate, each of the support plates is provided with a cross plate parallel to the support plate, and a plurality of the second blade clamping structures are arranged on the corresponding cross plates, and the lower surface of the cross plate and the lower surface of the support plate are located on the same horizontal plane.

[0010] As a preferred solution of the present invention, the limiting structure includes a limiting rod that passes through multiple circular sleeves in sequence along the lifting direction of the lifting device, and the top of the fixed seat is evenly provided with multiple slots around the axis of the connecting shaft. Multiple circular sleeves are each provided with a through hole for the limiting rod to pass through, and the limiting rod is slidably connected to the multiple through holes and inserted into the slot, the limiting rod is connected to the through hole by interference fit, and the limiting rod is connected to the slot by interference fit.

[0011] As a preferred solution of the present invention, the limiting rod includes a coaxially connected straight rod section and two threaded sections, and the two threaded sections are located at both ends of the straight rod section, the threaded section located at the top of the straight rod section is threadedly connected with a threaded sleeve, and the inner side wall of the slot is provided with a connecting thread for threaded connection with the threaded section at the bottom of the straight rod section.

[0012] As a preferred scheme of the present invention, the first blade clamping structure and the second blade clamping structure have the same structure, the first blade clamping structure includes a fixed screw rotatably connected to the bottom of the support plate and a fixed clamping plate fixedly connected to the bottom of the support plate, and the fixed screw is perpendicular to the fixed clamping plate, and a movable clamping plate is threadedly connected to the fixed screw and slidably connected to the bottom of the support plate, and an installation groove for installing the fixed screw is opened at the bottom of the support plate, and one end of the fixed screw passes through the installation groove to the outside of the support plate, and the fixed clamping plate and the movable clamping plate are parallel to each other and are both parallel to the axis of the connecting shaft.

[0013] As a preferred solution of the present invention, a plurality of indicator grooves are evenly arranged on the outer circular surface of the semicircular sleeve and the circumferential outer wall of the fixed seat around the axis of the connecting shaft, a plurality of through holes are arranged on each of the circular sleeves, and the plurality of through holes on each of the circular sleeves are evenly arranged around the axis of the connecting shaft, and the plurality of indicator grooves on each of the circular sleeves correspond one-to-one to the plurality of through holes, and the plurality of indicator grooves on the fixed seat correspond one-to-one to the plurality of slots.

[0014] As a preferred solution of the present invention, a vertical plate is fixedly provided on the outer wall of each circular sleeve, each vertical plate is provided with a mounting plate parallel to the axis of the connecting shaft, each mounting plate is rotatably connected to an adjusting screw, the end of each adjusting screw is rotatably connected to a slide plate, and each mounting plate is provided with a limiting plate that is in sliding contact with the top of the slide plate on the side facing the circular sleeve, arc grooves are provided on the peripheral outer walls of the fixed seat and on the outer walls of multiple circular sleeves, and the slide plate on each circular sleeve is used for sliding contact with the arc groove on the circular sleeve below.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention provides a plurality of detachable blade adjustment structures so that the corresponding first blade clamping structure can also be detached, so that the blades can be clamped and fixed before being installed on the connecting shaft, and the plurality of second blade clamping structures on the blade fixing structure have sufficient space when clamping and fixing the blades, thereby reducing the difficulty of installation. The plurality of first blade clamping structures and the plurality of second blade clamping structures all extend to the same position along the axial direction of the connecting shaft to clamp and fix the blades, so that the peripheral side of the rear disc is unobstructed, which is convenient for welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention from a first viewing angle;

[0019] Figure 2 It is a schematic diagram of the overall structure of the present invention from a second viewing angle;

[0020] Figure 3 It is a partial structural schematic diagram of the present invention;

[0021] Figure 4It is a structural schematic diagram of the blade adjustment structure of the present invention from a first viewing angle;

[0022] Figure 5 A schematic structural diagram of the blade adjustment structure of the present invention from a second viewing angle;

[0023] Figure 6 It is a structural schematic diagram of the blade fixing structure of the present invention;

[0024] Figure 7 for Figure 3 A schematic diagram of the structure enlargement of part A shown in FIG.

[0025] Figure 8 It is a schematic structural diagram of the limiting rod of the present invention.

[0026] The numbers in the figure represent the following:

[0027] 1. Frame; 2. Rotating device; 3. Lifting device; 5. Fixing device; 6. Connecting seat; 7. Connecting shaft; 8. Blade adjustment structure; 9. Limiting structure; 10. First blade clamping structure; 11. Blade fixing structure; 12. Second blade clamping structure; 13. Indicating groove; 14. Vertical plate; 15. Mounting plate; 16. Adjusting screw; 17. Slide plate; 18. Limiting plate; 19. Arc groove;

[0028] 801, semicircular sliding sleeve; 802, extension plate; 803, connecting plate; 804, supporting plate; 901, limiting rod; 902, slot; 903, through hole; 904, straight rod section; 905, threaded section; 906, threaded sleeve; 101, fixing screw; 102, fixing splint; 103, movable splint; 104, mounting groove; 111, fixing seat; 112, fixing plate; 113, supporting plate; 114, cross plate. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] like Figures 1 to 8As shown, the present invention provides a welding tool for fan impeller blades, including a frame 1, on which a rotating device 2 and a lifting device 3 are arranged in sequence from bottom to top, the rotating device 2 is provided with a fixing device 5 for fixing the rear disk, a connecting seat 6 is provided at the end of the lifting device 3, a connecting shaft 7 is rotatably connected to the connecting seat 6, a detachable movable sleeve on the connecting shaft 7 is provided with a plurality of blade adjustment structures 8, and the plurality of blade adjustment structures 8 are arranged in sequence along the axis of the connecting shaft 7, each blade adjustment structure 8 is provided with a plurality of first blade clamping structures 10, a blade fixing structure 11 is provided at the end of the connecting shaft 7, the blade fixing structure 11 and the plurality of blade adjustment structures 8 are jointly provided with a limiting structure 9, and the limiting structure 9 is used to fix the plurality of blade adjustment structures 8, and a plurality of second blade clamping structures 12 are provided on the blade fixing structure 11.

[0031] Among them, multiple first blade clamping structures 10 and multiple second blade clamping structures 12 are evenly distributed around the axis of the connecting shaft 7, and are all used to fix blades. The blades fixed by the multiple first blade clamping structures 10 and the blades fixed on the multiple second blade clamping structures 12 are at the same height.

[0032] In actual application of the present invention, the rear disc is fixed on the fixing device 5. At this time, the rotating device 2 limits the rotation of the rear disc to facilitate subsequent welding. Before the multiple blade adjustment structures 8 are installed on the connecting shaft 7, the multiple blades are first installed on the multiple first blade clamping structures 10 and the multiple second blade clamping structures 12 respectively. Since the multiple first blade clamping structures 10 are located outside the connecting shaft 7, the blades can be independently installed in a space away from the connecting shaft 7, so that the blades have sufficient installation space during installation. Since most of the blades are installed on the multiple first blade clamping structures 10, the number of the multiple second blade clamping structures 12 on the blade fixing structure 11 is correspondingly small, that is, the space between the multiple second blade clamping structures 12 is also larger, thereby reducing the difficulty of installation.

[0033] After the blades are installed, the multiple blade adjustment structures 8 are installed in sequence along the axial direction of the connecting shaft 7, and the angles between the multiple first blade clamping structures 10 and the angles between the first blade clamping structures 10 and the second blade clamping structures 12 are adjusted to ensure that all blades are evenly distributed around the axis of the connecting shaft 7. Subsequently, the multiple blade adjustment structures 8 are fixed by the limiting structure 9, and the blades clamped and fixed on the multiple first blade clamping structures 10 and the multiple second blade clamping structures 12 are all at the same height, that is, the multiple first blade clamping structures 10 and the multiple second blade clamping structures 12 are all extended to the same position along the axial direction of the connecting shaft 7, and the multiple first blade clamping structures 10 and the multiple second blade clamping structures 12 for installing the blades are separated from the fixing device 5, so that when welding the blades, the peripheral side of the rear disc is not blocked, which is convenient for subsequent welding work.

[0034] After the blade adjustment structure 8 is fixed on the connecting shaft 7, the lifting device 3 drives the multiple blades on the connecting shaft 7 to move until they contact the surface of the rear disk. At this time, the blades can be welded. The blades are fixed by the first blade clamping structure 10 and the second blade clamping structure 12, which avoids the position change of the blades and ensures the welding quality of the blades.

[0035] After the welding of the blades on one side is completed, the fixing device 5 is driven to rotate by the rotating device 2, thereby driving the rear disc and the blades welded with the rear disc to rotate synchronously, and then the connecting shaft 7 is rotated, so that the welding can be completed on one side of the frame 1, which is convenient for welding work.

[0036] The blade adjustment structure 8 includes two semicircular sleeves 801, and the semicircular sleeves 801 are combined into a circular sleeve by bolt fixation, and are used for sliding sleeves on the connecting shaft 7. A plurality of extension plates 802 are evenly arranged on the circumferential side of the circular sleeve, and each extension plate 802 is vertically arranged with a connecting plate 803, and each connecting plate 803 is arranged with a support plate 804, and a plurality of first blade clamping structures 10 are arranged on the corresponding support plates 804.

[0037] By tightening or loosening the fixing bolts, the two semicircular sleeves 801 are combined into a circular sleeve, and the sleeve is set on the connecting shaft 7, or the circular sleeve is disassembled into two semicircular sleeves 801 and then separated from the connecting shaft 7 for installation of the blades.

[0038] By setting a connecting plate 803 on the epitaxial plate 802, the support plate 804 is kept away from the epitaxial plate 802, so that the first blade clamping structure 10 on the support plate 804 is sufficiently away from the epitaxial plate 802 and is located at the same height as the second blade clamping structure 12, thereby avoiding the problem of obstruction on the peripheral side of the first blade clamping structure 10 and facilitating welding work.

[0039] The blade fixing structure 11 includes a fixing seat 111 fixedly set at the end of the connecting shaft 7, and a plurality of fixing plates 112 parallel to the extension plate 802 are evenly arranged on the circumferential side of the fixing seat 111, and each fixing plate 112 is vertically provided with a support plate 113 parallel to the connecting plate 803, and each support plate 113 is provided with a transverse plate 114 parallel to the support plate 804, and a plurality of second blade clamping structures 12 are arranged on the corresponding transverse plates 114, and the lower surface of the transverse plate 114 and the lower surface of the support plate 804 are located on the same horizontal plane.

[0040] The fixing seat 111 provides an installation position, and through multiple fixing plates 112 and multiple support plates 113, the cross plate 114 extends out along the axial direction of the connecting shaft 7 and is in the same horizontal plane with the support plate 804, which not only ensures that multiple blades are at the same height during welding, but also makes the surrounding side of the second blade clamping structure 12 unobstructed, which is convenient for welding.

[0041] The limiting structure 9 includes a limiting rod 901 that passes through multiple circular sleeves in sequence along the lifting direction of the lifting device 3. Multiple slots 902 are evenly arranged on the top of the fixed seat 111 around the axis of the connecting shaft 7. Through holes 903 are opened on the multiple circular sleeves for the limiting rod 901 to pass through, and the limiting rod 901 is slidably connected to the multiple through holes 903 and inserted into the slots 902. The limiting rod 901 is connected to the through holes 903 by interference fit, and the limiting rod 901 is connected to the slots 902 by interference fit.

[0042] By passing the limit rod 901 through the through holes 903 on the multiple circular sleeves in sequence until it is inserted into the corresponding slot 902, the multiple circular sleeves are restricted from rotating around the axis of the connecting shaft 7. At the same time, since the limit rod 901 and the through holes 903, and the limit rod 901 and the slot 902 are both interference connections, the axial movement of the multiple circular sleeves along the connecting shaft 7 is restricted. The multiple circular sleeves have a certain self-weight, so that the multiple circular sleeves are fixed on the connecting shaft 7, thereby ensuring the stability of the blades during welding.

[0043] A plurality of slots 902 are provided so that when the plurality of circular sleeves rotate around the connecting shaft 7 to adjust the angle between adjacent blades, the limiting rod 901 can be inserted into the corresponding slots 902 through the through hole 903 at a convenient position to fix the plurality of circular sleeves.

[0044] The limiting rod 901 includes a coaxially connected straight rod section 904 and two threaded sections 905, and the two threaded sections 905 are located at both ends of the straight rod section 904. The threaded section 905 located at the top of the straight rod section 904 is threadedly connected with a threaded sleeve 906, and the inner side wall of the slot 902 is provided with a connecting thread for threaded connection with the threaded section 905 at the bottom of the straight rod section 904.

[0045] When the limiting rod 901 is inserted into the slot 902, the threaded section 905 at the bottom of the straight rod section 904 engages with the connecting thread inside the slot 902, so that the bottom of the limiting rod 901 is fixed in the slot 902, and then the threaded sleeve 906 is rotated and tightened on the threaded section 905 at the top of the straight rod section 904 until it is against the top of the uppermost circular sleeve. At this time, multiple circular sleeves can be fixed, further ensuring the stability of the blade during welding.

[0046] The first blade clamping structure 10 and the second blade clamping structure 12 have the same structure. The first blade clamping structure 10 includes a fixed screw 101 rotatably connected to the bottom of the support plate 804 and a fixed clamping plate 102 fixedly connected to the bottom of the support plate 804, and the fixed screw 101 is perpendicular to the fixed clamping plate 102. A movable clamping plate 103 slidably connected to the bottom of the support plate 804 is threadedly connected to the fixed screw 101. A mounting groove 104 for mounting the fixed screw 101 is opened at the bottom of the support plate 804, and one end of the fixed screw 101 passes through the mounting groove 104 to the outside of the support plate 804. The fixed clamping plate 102 and the movable clamping plate 103 are parallel to each other and are both parallel to the axis of the connecting shaft 7.

[0047] Place the blade between the fixed clamping plate 102 and the movable clamping plate 103 in the direction required for welding, then rotate the fixing screw 101 so that the movable clamping plate 103 moves to abut against the surface of the blade and the other side of the blade abuts against the fixed clamping plate 102, and the blade is fixed at this time.

[0048] The mounting groove 104 is used to accommodate the fixing screw 101 to prevent the fixing screw 101 from interfering with the installation of the blade.

[0049] A plurality of indicating grooves 13 are evenly arranged on the outer circular surface of the semicircular sleeve 801 and the circumferential outer wall of the fixed seat 111 around the axis of the connecting shaft 7, a plurality of through holes 903 are arranged on each circular sleeve, and the plurality of through holes 903 on each circular sleeve are evenly arranged around the axis of the connecting shaft 7, and the plurality of indicating grooves 13 on each circular sleeve correspond one-to-one to the plurality of through holes 903, and the plurality of indicating grooves 13 on the fixed seat 111 correspond one-to-one to the plurality of slots 902.

[0050] By setting an indicating groove 13 on both the semicircular sliding sleeve 801 and the fixing seat 111, and the indicating groove 13 corresponds to the position of the through hole 903 and the slot 902, when the circular sliding sleeve is rotated, the relative positions of the through hole 903 and the slot 902 correspond, so that the limiting rod 901 can be accurately inserted into the corresponding slot 902 through multiple through holes 903 in sequence, thereby improving the convenience of the operator when using it.

[0051] Furthermore, the insertion rod can be inserted into the multiple indicator grooves 13 on the multiple circular sleeves and the indicator grooves 13 on the fixing seat 111 in sequence, so that after the circular sleeve is fixed in position, the rotation of the circular sleeve can be temporarily restricted by the insertion rod, thereby ensuring the accuracy of blade position adjustment.

[0052] Furthermore, by providing a plurality of through holes 903 , the limiting rod 901 can be inserted into the through hole 903 from a wide area, thereby improving the convenience of the operator in use.

[0053] A vertical plate 14 is fixedly provided on the outer wall of each circular sleeve, and a mounting plate 15 parallel to the axis of the connecting shaft 7 is provided on each vertical plate 14. An adjusting screw 16 is rotatably connected to each mounting plate 15, and a slide plate 17 is rotatably connected to the end of each adjusting screw 16. A limiting plate 18 that is in sliding contact with the top of the slide plate 17 is provided on the side of each mounting plate 15 facing the circular sleeve, and arc grooves 19 are provided on the peripheral outer walls of the fixed seat 111 and the outer walls of multiple circular sleeves, and the slide plate 17 on each circular sleeve is used for sliding contact with the arc groove 19 on the circular sleeve below.

[0054] The adjusting screw 16 is rotated to make the slide plate 17 approach or move away from the arc groove 19. Due to the restriction of the limiting plate 18, the slide plate 17 will not rotate when the adjusting screw 16 rotates, so that the slide plate 17 always maintains an unchanged posture and adapts to the arc groove 19 when entering the arc groove 19.

[0055] When the circular sleeve is arranged on the connecting shaft 7, the upper circular sleeve contacts the lower circular sleeve or contacts the fixed seat 111. At this time, the adjusting screw 16 is rotated to make the slide plate 17 enter the corresponding arc groove 19. Therefore, when the circular sleeve is rotated, the circular sleeve will not move along the axial direction of the connecting shaft 7, so that the angle between adjacent blades can be easily adjusted.

[0056] In this embodiment, since the circular sliding sleeve is composed of two semicircular sliding sleeves 801, there are two arc-shaped grooves 19, and the arc-shaped groove 19 on the fixing seat 111 is a complete ring.

[0057] In this embodiment, the rotating device 2, the lifting device 3 and the fixing device 5 are all existing technologies. For example, the rotating device 2 can be a motor that directly drives the fixing device 5, the lifting device 3 can be a hydraulic push rod, etc., and the fixing device 5 can be a circular plate connected to the rotating device 2 and a bidirectional screw driven by a motor arranged on the circular plate, and two arc-shaped extrusion plates connected to the bidirectional screw, and the two arc-shaped extrusion plates are both slidably connected to the circular plate, etc. The technical principle will not be elaborated in detail here.

[0058] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A welding tool for fan impeller blades, comprising a frame (1), characterized in that: The frame (1) is provided with a rotating device (2) and a lifting device (3) in sequence from bottom to top; the rotating device (2) is provided with a fixing device (5) for fixing the rear disc; a connecting seat (6) is provided at the end of the lifting device (3); a connecting shaft (7) is rotatably connected to the connecting seat (6); a detachable movable sleeve on the connecting shaft (7) is provided with a plurality of blade adjustment structures (8); and the plurality of blade adjustment structures (8) are arranged in sequence along the axis of the connecting shaft (7); each of the blade adjustment structures (8) is provided with a plurality of first blade clamping structures (10); a blade fixing structure (11) is provided at the end of the connecting shaft (7); the blade fixing structure (11) and the plurality of blade adjustment structures (8) are jointly provided with a limiting structure (9); and the limiting structure (9) is used to fix the plurality of blade adjustment structures (8); and a plurality of second blade clamping structures (12) are provided on the blade fixing structure (11); wherein the plurality of first blade clamping structures (10) and the plurality of second blade clamping structures (12) are evenly distributed around the axis of the connecting shaft (7) and are used to fix blades, and the blades fixed by the plurality of first blade clamping structures (10) and the blades fixed by the plurality of second blade clamping structures (12) are located at the same height; The blade adjustment structure (8) comprises two semicircular sleeves (801), and the semicircular sleeves (801) are fixedly assembled into a circular sleeve by bolts and are used for sliding sleeve arrangement on the connecting shaft (7); a plurality of extension plates (802) are evenly arranged on the circumference of the circular sleeve, a connecting plate (803) is vertically arranged on each of the extension plates (802), a supporting plate (804) is arranged on each of the connecting plates (803), and a plurality of the first blade clamping structures (10) are arranged on corresponding supporting plates (804); The blade fixing structure (11) comprises a fixing seat (111) fixedly arranged at the end of the connecting shaft (7); a plurality of fixing plates (112) parallel to the extension plate (802) are evenly arranged on the circumference of the fixing seat (111); a supporting plate (113) parallel to the connecting plate (803) is vertically arranged on each of the fixing plates (112); a transverse plate (114) parallel to the supporting plate (804) is arranged on each of the supporting plates (113); and a plurality of the second blade clamping structures (12) are arranged on corresponding transverse plates (114); and the lower surface of the transverse plate (114) and the lower surface of the supporting plate (804) are located on the same horizontal plane; A vertical plate (14) is fixedly arranged on the outer wall of each circular sliding sleeve, and a mounting plate (15) parallel to the axis of the connecting shaft (7) is arranged on each vertical plate (14), and an adjusting screw (16) is rotatably connected to each mounting plate (15), and a slide plate (17) is rotatably connected to the end of each adjusting screw (16), and a limiting plate (18) is arranged on the side of each mounting plate (15) facing the circular sliding sleeve, and is in sliding contact with the top of the slide plate (17). Arc grooves (19) are provided on the peripheral outer wall of the fixed seat (111) and the outer walls of the plurality of circular sliding sleeves, and the slide plate (17) on each circular sliding sleeve is used to be in sliding contact with the arc groove (19) on the circular sliding sleeve below.

2. The welding tool for fan impeller blades according to claim 1, characterized in that: The limiting structure (9) comprises a limiting rod (901) which passes through a plurality of circular sleeves in sequence along the lifting direction of the lifting device (3); a plurality of slots (902) are evenly arranged on the top of the fixing seat (111) around the axis of the connecting shaft (7); a plurality of circular sleeves are each provided with a through hole (903) for the limiting rod (901) to pass through; the limiting rod (901) is slidably connected to the plurality of through holes (903) and inserted into the slot (902); the limiting rod (901) is connected to the through hole (903) by an interference fit; and the limiting rod (901) is connected to the slot (902) by an interference fit.

3. The welding tool for fan impeller blades according to claim 2, characterized in that: The limiting rod (901) comprises a coaxially connected straight rod section (904) and two threaded sections (905), wherein the two threaded sections (905) are located at two ends of the straight rod section (904), the threaded section (905) located at the top of the straight rod section (904) is threadedly connected to a threaded sleeve (906), and the inner side wall of the slot (902) is provided with a connecting thread for threadingly connecting to the threaded section (905) at the bottom of the straight rod section (904).

4. The welding tool for fan impeller blades according to claim 1, characterized in that: The first blade clamping structure (10) and the second blade clamping structure (12) have the same structure. The first blade clamping structure (10) comprises a fixed screw (101) rotatably connected to the bottom of the support plate (804) and a fixed clamping plate (102) fixedly connected to the bottom of the support plate (804), and the fixed screw (101) is perpendicular to the fixed clamping plate (102). A movable clamping plate (103) slidably connected to the bottom of the support plate (804) is threadedly connected to the fixed screw (101). A mounting groove (104) for mounting the fixed screw (101) is provided at the bottom of the support plate (804), and one end of the fixed screw (101) passes through the mounting groove (104) to the outside of the support plate (804). The fixed clamping plate (102) and the movable clamping plate (103) are parallel to each other and are both parallel to the axis of the connecting shaft (7).

5. The welding tool for fan impeller blades according to claim 2, characterized in that: A plurality of indicating grooves (13) are evenly arranged on the outer circular surface of the semicircular sliding sleeve (801) and the outer peripheral wall of the fixing seat (111) around the axis of the connecting shaft (7), a plurality of through holes (903) are arranged on each of the circular sliding sleeves, and the plurality of through holes (903) on each of the circular sliding sleeves are evenly arranged around the axis of the connecting shaft (7), and the plurality of indicating grooves (13) on each of the circular sliding sleeves correspond one-to-one to the plurality of through holes (903), and the plurality of indicating grooves (13) on the fixing seat (111) correspond one-to-one to the plurality of slots (902).

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