Backfill type friction stir spot welding main shaft welding tool

Abstract

The invention belongs to the technical field of friction stir spot welding, and particularly relates to a backfill type friction stir spot welding main shaft welding tool. The device comprises a stirring sleeve welding tool and a stirring needle welding tool coaxially arranged in the stirring sleeve welding tool; the stirring needle welding tool is provided with a jackscrew used for locking a stirring needle of the stirring needle welding tool and a stirring needle rotating shaft, the stirring sleeve welding tool is provided with a dismounting and mounting hole, the jackscrew and the dismounting and mounting hole are coaxially arranged during dismounting and mounting, and a dismounting and mounting tool reaches the screwing end of the jackscrew through the dismounting and mounting hole so as to dismount and mount the jackscrew. According to the invention, the disassembly and assembly hole coaxial with the jackscrew is formed, so that'independent disassembly and integrated taking-out 'can be realized, and the arranged tensioning assembly is convenient for tensioning the stirring sleeve assembly.

Description

Technical Field

[0001] The invention belongs to the technical field of friction stir spot welding, and in particular relates to a backfill type friction stir spot welding spindle welding tool. Background Art

[0002] Backfill friction stir spot welding is an advanced solid-phase joining technology. It generates heat through friction between the stirring head and the workpiece, causing the material to reach a thermoplastic state. By precisely controlling the axial movement of the sleeve and the stirring needle, the thermoplastic material undergoes severe plastic deformation under the action of mechanical force, breaking up the original overlapping interface and fully mixing it. As the stirring head retracts, the exit hole formed by the stirring head during the welding process is filled, thus forming a keyhole-free weld.

[0003] The current installation method of the backfill type friction stir spot welding spindle welding tool is that the stirring needle is installed on the stirring needle rotating shaft by screws, and the stirring sleeve is installed on the stirring sleeve rotating shaft by screws. The stirring sleeve and the stirring sleeve rotating shaft sleeve are arranged outside the stirring needle and the stirring needle rotating shaft. The problems that inevitably arise from the above structure are:

[0004] Due to the unique working mode of this welding tool, when it stops working, the gap between the stirring needle and the stirring sleeve will inevitably be filled with aluminum material generated during operation, and as the aluminum material cools and solidifies, the stirring needle and the stirring sleeve will be firmly adhered together. Since the two are relatively fixed, the next batch of welding work cannot be carried out normally, and the stirring needle and stirring sleeve must be replaced as a whole, that is, the stirring needle and stirring sleeve need to be removed from their corresponding rotating shafts. However, because the stirring needle is coaxially arranged in the stirring sleeve, and the stirring sleeve and the stirring needle are formed into one piece due to the solidification and adhesion of the aforementioned aluminum material, the disassembly tool cannot enter the stirring sleeve to remove the screws between the stirring needle and the stirring needle rotating shaft, resulting in the stirring needle and the stirring sleeve being unable to be removed from the corresponding rotating shafts.

[0005] The existing solution is to prepare an alkaline solution pool in advance and then soak the entire welding tool in the alkaline solution pool for 1 to 3 days. Although this is enough to destroy the bonding relationship between the stirring needle and the stirring sleeve and realize the subsequent removal of the stirring needle, it obviously not only increases the cost, but also the machine is in a shutdown state during the soaking, which seriously affects the production efficiency. Therefore, there is an urgent need for a backfill stir friction spot welding spindle welding tool to solve the above problems. Summary of the Invention

[0006] To overcome the above-mentioned shortcomings of the prior art, the present invention provides a backfill friction stir spot welding spindle welding tool. The present invention provides a disassembly hole coaxial with the top screw, enabling "separate disassembly and integral removal." Furthermore, the provided tensioning assembly facilitates tightening the stir sleeve assembly.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A backfill type stir friction spot welding spindle welding tool, which includes a stirring sleeve welding tool and a stirring pin welding tool coaxially arranged inside the stirring sleeve welding tool; the stirring pin welding tool is provided with a top screw for locking the stirring pin and the stirring pin rotating shaft of the stirring pin welding tool, and a disassembly hole is opened on the stirring sleeve welding tool. The top screw and the disassembly hole are coaxially arranged during disassembly and assembly, so that the disassembly tool can reach the screwing end of the top screw through the disassembly hole to disassemble and assemble the top screw.

[0009] Preferably, the stirring sleeve welding tool includes a stirring sleeve rotating shaft and a stirring sleeve assembly detachably connected to the stirring sleeve rotating shaft through a tightening assembly; the tightening assembly includes a tool handle claw and a pull rod coaxially arranged in the grip of the tool handle claw, the tool handle claw and the pull rod are both subjected to axial elastic force, and the directions of the elastic forces are opposite, so that the tool handle claw and the pull rod are abutted and positioned from top to bottom, and a hanging point is provided on the tool handle claw to support the stirring sleeve assembly.

[0010] Preferably, the tensioning assembly also includes a first spring, a second spring and a fixing piece. The top of the pull rod is fixedly connected with a retaining ring, and the retaining ring is sleeved in an annular limit groove opened on the outer wall of the stirring needle rotating shaft. The top and bottom ends of the first spring are respectively abutted against the retaining ring and the annular limit groove, thereby applying an upward elastic pre-tightening force to the pull rod in the axial direction; the tool handle claw is movably connected to the fixing piece in the axial direction, and the fixing piece is fixed in an annular groove opened on the inner wall of the stirring sleeve rotating shaft, so that the tool handle claw is hoisted in the annular groove; the second spring is sleeved on the stirring needle rotating shaft, and the top and bottom ends of the second spring are respectively abutted against the fixing piece and the tool handle claw, thereby applying a downward thrust to the tool handle claw in the axial direction.

[0011] Preferably, the outer wall of the pull rod is provided with a first protrusion protruding outward; the outer wall of the grip of the tool handle pulling claw is provided with a second protrusion protruding outward, the second protrusion is a hanging point, and the second protrusion rests on the first protrusion so that the stirring sleeve assembly is hung on the second protrusion; the contact surface between the tool handle pulling claw and the pull rod is a first wedge surface, and the contact surface between the tool handle pulling claw and the inner wall of the rotating shaft of the stirring sleeve is a second wedge surface.

[0012] Preferably, the stirring needle is provided with a first positioning piece protruding radially, and the end face of the first positioning piece constitutes a contact surface against the bottom surface of the stirring needle rotating shaft; the side wall of the stirring needle is provided with a first anti-rotation surface, and the bottom of the inner wall of the stirring needle rotating shaft is provided with a first positioning surface adapted to the shape of the first anti-rotation surface, and the first anti-rotation surface and the first positioning surface form a anti-rotation fit.

[0013] Preferably, the stirring sleeve assembly includes a handle nut, a stirring sleeve and a stirring sleeve handle arranged in sequence from bottom to top, the stirring sleeve is mounted on the handle nut, and the end of the stirring sleeve passes through the handle nut, the inner wall of the stirring sleeve rotating shaft is provided with a top groove for the stirring sleeve handle to extend into, the inner wall of the stirring sleeve handle is provided with a card slot, the card slot cooperates with the second protrusion, and the disassembly hole is provided on the stirring sleeve handle.

[0014] Preferably, a second positioning piece is provided on the stirring sleeve, and a second anti-rotation surface is provided on the side wall of the second positioning piece. The inner wall of the stirring sleeve handle is provided with a second positioning surface that is adapted to the shape of the second anti-rotation surface, and the second anti-rotation surface and the second positioning surface form a anti-rotation fit; the inner wall of the handle nut is threadedly connected to the outer wall of the stirring sleeve handle; the outer wall of the stirring sleeve handle is provided with a step that supports the rotating shaft of the stirring sleeve, so that when the tensioning assembly tightens the stirring sleeve handle upward, the stirring sleeve handle is abutted against the rotating shaft of the stirring sleeve.

[0015] Preferably, a top screw hole is opened on the side wall of the stirring pin rotating shaft, and the top screw is installed in the top screw hole. The top screw hole is coaxially arranged with the disassembly hole during disassembly.

[0016] Preferably, a force-applying groove adapted to the top screw is provided on the outer wall of the stirring needle, the disassembly hole and the top screw hole are both inclined, and the center axis of the top screw hole forms an inclination angle of - degrees with the horizontal plane, so that the stirring needle and the stirring needle rotating axis are fitted and fixed when the top screw is locked.

[0017] Preferably, the first anti-rotation surface and the force-applying groove are distributed on two opposite sides.

[0018] The advantages of the present invention are:

[0019] (1) The present invention provides a disassembly hole on the stirring sleeve handle, which corresponds to the top screw hole on the stirring needle rotating shaft, so that the disassembly tool can easily enter the welding tool to disassemble the top screw, breaking the traditional conventional disassembly idea of "to remove the stirring needle, the stirring sleeve must be removed first". Instead, the disassembly hole and the top screw hole are used to form an independent disassembly path for the stirring needle. During the disassembly operation, the stirring sleeve and the stirring needle both have separate disassembly paths, achieving the effect of "separate disassembly and integral removal". Later, the needle sleeve can be treated with alkali solution as a whole or in a centralized manner. Of course, direct forced pulling can be used more often to destroy the adhesion of the needle sleeve to further reduce the processing cost, and the welding equipment can be continuously replaced and work continuously, which greatly ensures the efficiency of the welding production line operation.

[0020] (2) Since the existing stirring needle and the stirring needle rotating shaft, and the stirring sleeve and the stirring sleeve rotating shaft are assembled through threaded holes, there is a gap between the stirring needle and the stirring needle rotating shaft, and there is also a gap between the stirring sleeve and the stirring sleeve rotating shaft, which easily leads to the problem of poor coaxiality after the stirring needle and the stirring sleeve are assembled. The present invention provides a positioning piece and a rotation-stopping surface on the stirring needle and the stirring sleeve, and at the same time uses a tightening assembly, eliminating the need for bolt fixation. The present invention relies on the positioning piece and the end face fitting positioning, so that the coaxial accuracy of the stirring needle and the stirring sleeve after assembly is higher, greatly reducing the problem of poor coaxiality.

[0021] (3) The present invention can detachably mount the stirring sleeve assembly on the stirring sleeve rotating shaft by providing a tensioning assembly, wherein the first spring in the tensioning assembly is in a compressed state when the welding tool is working, thereby providing an upward thrust to the pull rod, and the second spring in the tensioning assembly is also in a compressed state at this time, thereby providing a downward thrust to the tool handle pulling claw. The two interact with each other, so that the first protrusion lifts the tool handle pulling claw upward, and then pushes the second protrusion to move toward the slot of the stirring sleeve tool handle, thereby causing the tool handle pulling claw to tightly tighten the stirring sleeve tool handle. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention.

[0023] Figure 2 It is a schematic diagram of the overall structure of the present invention.

[0024] Figure 3 It is a schematic diagram of the front structure of the present invention.

[0025] Figure 4 Schematic diagram of the internal structure of the present invention Figure 1 .

[0026] Figure 5 Schematic diagram of the internal structure of the present invention Figure 2 .

[0027] Figure 6 Schematic diagram of the internal structure of the present invention Figure 3 .

[0028] Figure 7 This is a schematic diagram of the cross-sectional structure of the stirring needle of the present invention.

[0029] Figure 8 This is a schematic diagram of the top view of the stirring needle of the present invention.

[0030] Figure 9 This is a schematic diagram of the cross-sectional structure of the stirring sleeve of the present invention.

[0031] Figure 10 It is a schematic diagram of the top view of the mixing jacket of the present invention.

[0032] The meanings of the symbols in the figure are as follows:

[0033] 1-stirring sleeve welding tool, 2-stirring needle welding tool, 3-stirring sleeve rotating shaft, 4-stirring sleeve assembly, 5-handle nut, 6-stirring sleeve, 7-stirring sleeve handle, 8-disassembly hole, 9-stirring needle rotating shaft, 10-stirring needle, 11-handle claw, 12-pull rod, 13-first spring, 14-blocking ring, 15-limiting groove, 16-top screw hole, 17-top screw, 18-card slot, 19-annular groove, 20-second spring, 21-first positioning member, 22-force groove, 23-first anti-rotation surface, 24-second positioning member, 25-second anti-rotation surface, 26-top groove, 27-first protrusion, 28-second protrusion, 29-fixing member. DETAILED DESCRIPTION

[0034] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0035] like Figure 1-10 As shown, a backfill friction stir spot welding spindle welding tool includes a stirring sleeve welding tool 1, a stirring pin welding tool 2, and a tensioning assembly. The stirring pin welding tool 2 is sleeved inside the stirring sleeve welding tool 1, and the tensioning assembly is installed in the space between the stirring sleeve welding tool 1 and the stirring pin welding tool 2 to connect the stirring sleeve rotating shaft 3 and the stirring sleeve assembly 4.

[0036] Specifically, the stirring sleeve welding tool 1 includes a stirring sleeve rotating shaft 3 and a stirring sleeve assembly 4. The stirring sleeve assembly 4 includes a handle nut 5, a stirring sleeve 6 and a stirring sleeve handle 7 that are connected to each other. The boss of the stirring sleeve 6 is mounted on the handle nut 5, and the end of the stirring sleeve 6 passes through the through hole in the middle of the handle nut 5. The top of the boss of the stirring sleeve 6 is provided with a second positioning member 24 that is integrally formed with the boss and coaxially arranged. The side wall of the second positioning member 24 is provided with a second anti-rotation surface 25. The inner wall of the stirring sleeve handle 7 is provided with a second positioning surface that is adapted to the shape of the second anti-rotation surface 25. The second anti-rotation surface 25 forms a anti-rotation fit with the second positioning surface. The inner wall of the handle nut 5 is threadedly connected to the outer wall of the stirring sleeve handle 7, so that when the handle nut 5 is tightened, the second anti-rotation surface 25 is in contact with the second positioning surface, the top surface of the boss of the stirring sleeve 6 is in contact with the bottom surface of the stirring sleeve handle 7, and at the same time, the bottom surface of the boss of the stirring sleeve 6 is in contact with the handle nut 5. Since the boss of the stirring sleeve 6 is located between the handle nut 5 and the stirring sleeve handle 7, when the handle nut 5 is tightened, the three form a tightly connected structure. The outer wall of the stirring sleeve handle 7 is provided with a step for supporting the stirring sleeve rotating shaft 3, and the top of the stirring sleeve handle 7 extends into the top groove 26 opened on the inner wall of the stirring sleeve rotating shaft 3 and abuts against the top groove 26, so that when the tensioning assembly moves upward, the stirring sleeve handle 7 can be locked in the top groove 26.

[0037] The stirring pin welding tool 2 includes a stirring pin 10 and a stirring pin rotating shaft 9. The end of the stirring pin 10 passes through the end of the stirring sleeve 6, and the stirring pin 10 is coaxially arranged with the stirring sleeve 6. The stirring pin 10 is detachably connected to the stirring pin rotating shaft 9 through a top screw 17. Specifically, a top screw hole 16 is provided on the side wall of the stirring pin rotating shaft 9. The top screw 17 is threadedly connected to the top screw hole 16, and the top screw hole 16 is tilted. The central axis of the top screw hole 16 forms an inclination angle of 40-80 degrees with the horizontal plane, so that when the top screw 17 is connected to the top screw hole 16, the end of the top screw 17 will extend out of the top screw hole 16 and enter into the force groove 22 provided on the outer wall of the stirring pin 10. The shape of the force groove 22 is adapted to the top screw 17, thereby positioning the stirring pin 10.

[0038] Furthermore, a fixing groove is provided on the inner wall of the bottom of the stirring needle rotating shaft 9, and the top of the stirring needle 10 extends into the fixing groove and is engaged with the fixing groove. At the same time, a first positioning member 21 is radially protruded from the outer wall of the stirring needle 10, and the end face of the first positioning member 21 is against the bottom face of the stirring needle rotating shaft 9. The side wall of the stirring needle 10 is provided with a first anti-rotation surface 23, so that the first anti-rotation surface 23 and the end face of the first positioning member 21 constitute the contact surface between the stirring needle 10 and the stirring needle rotating shaft 9. A first positioning surface that is adapted to the shape of the first anti-rotation surface 23 is provided in the fixing groove, and the first anti-rotation surface 23 forms a anti-rotation fit with the first positioning surface. The first anti-rotation surface 23 is symmetrically arranged with the force groove 22, and when the top screw 17 is locked, the first anti-rotation surface 23 is squeezed and fitted with the inner wall of the fixing groove, so that the stirring needle 10 and the stirring needle rotating shaft 9 are relatively fixed.

[0039] A disassembly hole 8 is provided on the stirring sleeve assembly 4 for a disassembly tool to extend into the stirring sleeve welding tool 1 to disassemble and install the top screw 17, and when the stirring needle welding tool 2 is in the disassembly position, the top screw hole 16 and the disassembly hole 8 are coaxially arranged, thereby facilitating the disassembly tool to first extend into the disassembly hole 8 to reach the top screw hole 16, thereby facilitating the disassembly and installation of the top screw 17.

[0040] Furthermore, the tensioning assembly includes a tool handle claw 11, a pull rod 12 sleeved in the grip of the tool handle claw 11, a first spring 13 and a second spring 20, a retaining ring 14 is fixedly connected to the top of the pull rod 12, the retaining ring 14 is connected to the pull rod 12 as a whole, the retaining ring 14 is sleeved in a limiting groove 15 provided on the outer wall of the stirring needle rotating shaft 9, the outer wall of the pull rod 12 is provided with a first protrusion 27 protruding outward, the outer diameter of the first protrusion 27 is larger than the inner diameter of the grip of the tool handle claw 11, the outer wall of the grip of the tool handle claw 11 is provided with a second protrusion 28 protruding outward, the second protrusion 28 is a hanging point, and the second protrusion 28 is engaged with the slot 18 provided on the inner wall of the stirring sleeve tool handle 7. The first spring 13 is also sleeved in the limiting groove 15, the retaining ring 14 abuts against the top of the first spring 13, and the bottom of the first spring 13 abuts against the limiting groove 15. The first spring 13 is in a relaxed state when the stirring needle is installed (see for details). Figure 1 , at this time the stirring needle welding tool 2 is in the disassembly position), after the stirring needle 10 is installed, the stirring needle rotating shaft 9 drives the stirring needle 10 to move up, the first spring 13 is gradually compressed, and the tensioning component tightens the stirring sleeve handle 7. After the stirring sleeve handle 7 is tightened, the stirring needle rotating shaft 9 will continue to move up until it reaches the working position range. When the stirring needle 10 is in the working state, the first spring 13 is always in a compressed state.

[0041] An annular groove 19 is provided at the top of the inner wall of the stirring sleeve rotating shaft 3, and the top of the fixing member 29 is fixedly installed at the top of the annular groove 19. The tool handle pulling claw 11 is movably buckled with the fixing member 29 along the axial direction, so that the tool handle pulling claw 11 is hung on the fixing member 29. The bottom of the fixing member 29 abuts against the top of the second spring 20, and the bottom end of the second spring 20 abuts against the tool handle pulling claw 11. When the stirring needle rotating shaft 9 drives the pull rod 12 to move axially upward, the pull rod 12 can drive the tool handle pulling claw 11 to move; at the same time, during the tightening process of the tensioning assembly, the second spring 20 is in a compressed state, and the second spring 20 gives the tool handle pulling claw 11 a downward force. The bottom end of the tool handle pulling claw 11 is tightly tightened to the stirring sleeve tool handle 7 due to the outward abutment force of the first protrusion 27 at the bottom of the pull rod 12. The contact surface between the tool handle claw 11 and the pull rod 12 is the first wedge surface, and the contact surface between the tool handle claw 11 and the inner wall of the stirring sleeve rotating shaft 3 is the second wedge surface. The length of the second wedge surface is the maximum downward distance of the tool handle claw 11. The two wedge surfaces are in opposite directions, and the contact surface between the tool handle claw 11 and the stirring sleeve handle 7 is the third wedge surface, so that after the welding tool is installed, the tool handle claw 11, the pull rod 12 and the stirring sleeve rotating shaft 3 are tightly connected, and the tool handle claw 11 further tightens the stirring sleeve handle 7.

[0042] The tensioning assembly of the present invention achieves the tensioning of the stirring sleeve handle 7 through a set of elastic forces in relative directions of the first spring 13 and the second spring 20 and the coordinated design of the handle claw 11 and the pull rod 12.

[0043] The stirring sleeve handle 7 can be modified from an HSK handle. The stirring sleeve 6 can be installed and disassembled on the stirring sleeve rotating shaft 3 through the stirring sleeve handle 7 and the handle nut 5. The stirring needle 10 can be installed and disassembled on the stirring needle rotating shaft 9 through the top screw 17; the stirring sleeve rotating shaft 3 and the stirring needle rotating shaft 9 rotate in the same direction and at the same speed, and can respectively drive the stirring sleeve 6 and the stirring needle 10 to move up and down to realize backfill spot welding action.

[0044] The entire process of assembly and disassembly of the backfill friction stir spot welding spindle welding tool is as follows:

[0045] 1) Welding tool installation:

[0046] ① Loosen the top screw 17 on the stirring needle rotating shaft 9, and align the radial first anti-rotation surface 23 on the stirring needle 10 with the first positioning surface on the stirring needle rotating shaft 9, insert the stirring needle 10 into the fixing groove in the stirring needle rotating shaft 9, and then tighten the top screw 17 to press the stirring needle 10 tightly, and align and fix the end surface of the first positioning member 21 with the bottom end surface of the stirring needle rotating shaft 9, so that the stirring needle 10 is completely fixed to the stirring needle rotating shaft 9, ensuring the coaxiality and verticality of the assembly, and transmitting the rotational torque through the first anti-rotation surface 23;

[0047] ② Align the radial second anti-rotation surface 25 on the stirring sleeve 6 with the second positioning surface on the stirring sleeve handle 7, install the stirring sleeve 6 on the stirring sleeve handle 7, and fix the stirring sleeve 6 axially through the handle nut 5. The torque of the stirring sleeve 6 is transmitted through the second anti-rotation surface 25. The stirring sleeve 6, the stirring sleeve handle 7 and the handle nut 5 are combined into a stirring sleeve assembly 4;

[0048] ③ Drive the stirring needle rotating shaft 9 to move downward to the disassembly position (at this time, the axial position of the stirring sleeve rotating shaft 3 is also controlled so that after the stirring sleeve handle 7 is installed, the top screw hole 16 and the disassembly hole 8 are coaxially arranged). During this movement, the stirring needle rotating shaft 9 pushes the pull rod 12 downward through the retaining ring 14, thereby loosening the handle pulling claw 11, installing the stirring sleeve assembly 4 on the stirring sleeve rotating shaft 3, and engaging the stirring sleeve handle 7 with the stirring sleeve rotating shaft 3, so that the top screw 17 is aligned with the disassembly hole 8 on the stirring sleeve 6; then drive the stirring needle rotating shaft 9 to move upward to the initial position, and the stirring needle rotating shaft 3 is rotated. The rotating shaft 9 drives the retaining ring 14 and the pull rod 12 to move upward through the first spring 13, and the first protrusion 27 squeezes the second protrusion 28 of the tool handle claw 11 to move into the slot 18 and drives the stirring sleeve tool handle 7 to move upward until the stirring sleeve tool handle 7 is completely in close contact with the end face of the bottom of the stirring sleeve rotating shaft 3, thereby realizing the installation and fixation of the stirring sleeve assembly 4. At this time, the first spring 13 is in a compressed state. During the tightening process of the stirring sleeve assembly 4, the axial position of the stirring sleeve rotating shaft 3 is also controlled, so that the second spring 20 is compressed, and the second spring 20 pushes the tool handle claw 11 downward.

[0049] 2) Welding tool disassembly:

[0050] ① Drive the stirring needle rotating shaft 9 downward to the disassembly position, align the top screw 17 with the disassembly hole 8 on the stirring sleeve 6, and then use the disassembly tool to loosen the top screw 17, and then the stirring needle 10 and the stirring sleeve assembly 4 can be removed together;

[0051] ② Loosen the handle nut 5, remove the stirring sleeve handle 7 and the handle nut 5, and the removed stirring needle 10 and stirring sleeve 6 can be cleaned and disassembled by mechanical or chemical means.

[0052] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A backfill type friction stir spot welding spindle welding tool, characterized in that: The welding tool comprises a stirring sleeve welding tool (1) and a stirring pin welding tool (2) coaxially arranged in the stirring sleeve welding tool (1); the stirring pin welding tool (2) is provided with a top screw (17) for locking a stirring pin (10) and a stirring pin rotating shaft (9) of the stirring pin welding tool (2); a disassembly hole (8) is provided on the stirring sleeve welding tool (1); the top screw (17) and the disassembly hole (8) are coaxially arranged during disassembly, so that a disassembly tool reaches the screwing end of the top screw (17) through the disassembly hole (8) to disassemble the top screw (17).

2. The backfill friction stir spot welding spindle welding tool according to claim 1, characterized in that: The stirring sleeve welding tool (1) comprises a stirring sleeve rotating shaft (3) and a stirring sleeve assembly (4) detachably connected to the stirring sleeve rotating shaft (3) via a tensioning assembly; the tensioning assembly comprises a tool handle pulling claw (11) and a pulling rod (12) coaxially arranged in a grip of the tool handle pulling claw (11); the tool handle pulling claw (11) and the pulling rod (12) are both subjected to axial elastic forces, and the directions of the elastic forces are opposite, so that the tool handle pulling claw (11) and the pulling rod (12) are abutted and positioned from top to bottom; a hanging point is provided on the tool handle pulling claw (11) to support the stirring sleeve assembly (4).

3. The backfill friction stir spot welding spindle welding tool according to claim 2, characterized in that: The tensioning assembly also includes a first spring (13), a second spring (20) and a fixing member (29), the top of the pull rod (12) is fixedly connected with a retaining ring (14), and the retaining ring (14) is sleeved in an annular limiting groove (15) provided on the outer wall of the stirring needle rotating shaft (9), and the top and bottom ends of the first spring (13) are respectively in contact with the retaining ring (14) and the annular limiting groove (15), thereby applying an upward elastic pre-tightening force to the pull rod (12) in the axial direction; the tool handle pulling claw (11) is movably coupled to the fixing member (29) along the axial direction, and the fixing member (29) is fixed in an annular groove (19) provided on the inner wall of the stirring sleeve rotating shaft (3), so that the tool handle pulling claw (11) is hoisted in the annular groove (19); the second spring (20) is sleeved on the stirring needle rotating shaft (9), and the top and bottom ends of the second spring (20) are respectively in contact with the fixing member (29) and the tool handle pulling claw (11), thereby applying a downward thrust to the tool handle pulling claw (11) along the axial direction.

4. A backfill type friction stir spot welding spindle welding tool according to claim 2 or 3, characterized in that: The outer wall of the pull rod (12) is provided with a first protrusion (27) protruding outward; the outer wall of the grip of the tool handle pulling claw (11) is provided with a second protrusion (28) protruding outward, the second protrusion (28) is a hanging point, and the second protrusion (28) rests on the first protrusion (27) so that the stirring sleeve assembly (4) is hung on the second protrusion (28); the contact surface between the tool handle pulling claw (11) and the pull rod (12) is a first wedge surface, and the contact surface between the tool handle pulling claw (11) and the inner wall of the stirring sleeve rotating shaft (3) is a second wedge surface.

5. The backfill type friction stir spot welding spindle welding tool according to claim 1, characterized in that: The stirring needle (10) is provided with a first positioning member (21) protruding in the radial direction, and the end face of the first positioning member (21) constitutes a contact surface against the bottom surface of the stirring needle rotating shaft (9); the side wall of the stirring needle (10) is provided with a first anti-rotation surface (23), and the bottom of the inner wall of the stirring needle rotating shaft (9) is provided with a first positioning surface that is adapted to the shape of the first anti-rotation surface (23), and the first anti-rotation surface (23) forms a anti-rotation fit with the first positioning surface.

6. The backfill type friction stir spot welding spindle welding tool according to claim 4, characterized in that: The stirring sleeve assembly (4) comprises a handle nut (5), a stirring sleeve (6) and a stirring sleeve handle (7) which are arranged in sequence from bottom to top. The stirring sleeve (6) is mounted on the handle nut (5), and the end of the stirring sleeve (6) passes through the handle nut (5). The inner wall of the stirring sleeve rotating shaft (3) is provided with a top groove (26) for the stirring sleeve handle (7) to extend into. The inner wall of the stirring sleeve handle (7) is provided with a clamping groove (18), which cooperates with the second protrusion (28). The disassembly hole (8) is provided on the stirring sleeve handle (7).

7. The backfill type friction stir spot welding spindle welding tool according to claim 6, characterized in that: The stirring sleeve (6) is provided with a second positioning member (24), the side wall of the second positioning member (24) is provided with a second anti-rotation surface (25), the inner wall of the stirring sleeve blade handle (7) is provided with a second positioning surface that matches the shape of the second anti-rotation surface (25), and the second anti-rotation surface (25) forms an anti-rotation fit with the second positioning surface; the inner wall of the blade handle nut (5) is threadedly connected to the outer wall of the stirring sleeve blade handle (7); the outer wall of the stirring sleeve blade handle (7) is provided with a step that supports the stirring sleeve rotating shaft (3), so that when the tensioning component tightens the stirring sleeve blade handle (7) upward, the stirring sleeve blade handle (7) and the stirring sleeve rotating shaft (3) are in contact with each other.

8. The backfill friction stir spot welding spindle welding tool according to claim 5, characterized in that: A top screw hole (16) is provided on the side wall of the stirring needle rotating shaft (9), and a top screw (17) is installed in the top screw hole (16). The top screw hole (16) is coaxially arranged with the disassembly hole (8) during disassembly.

9. The backfill type friction stir spot welding spindle welding tool according to claim 8, characterized in that: The outer wall of the stirring needle (10) is provided with a force-applying groove (22) adapted to the top screw (17); the disassembly hole (8) and the top screw hole (16) are both inclined, and the central axis of the top screw hole (16) forms an inclination angle of 40-80 degrees with the horizontal plane, so that when the top screw (17) is locked, the stirring needle (10) and the stirring needle rotating shaft (9) are fitted and fixed.

10. The backfill type friction stir spot welding spindle welding tool according to claim 9, characterized in that: The first anti-rotation surface (23) and the force-applying groove (22) are distributed on two opposite sides.

Images