Friction stir welding spindle and welding equipment

Abstract

The friction stir welding main shaft comprises a machine body, a shaft core, a backfilling needle cutter handle assembly, a stirring sleeve cutter handle assembly and a pressing sleeve cutter handle assembly, the shaft core is supported on the machine body through a first bearing seat, and the machine body is provided with a first oil cylinder for driving the first bearing seat to move in the axial direction; the backfilling needle knife handle assembly comprises a backfilling needle and a backfilling needle knife handle, the backfilling needle is connected to the end of the shaft core, the stirring sleeve knife handle assembly comprises a stirring sleeve knife handle connecting seat, a stirring sleeve knife handle and a stirring sleeve, the stirring sleeve knife handle connecting seat is arranged on the shaft core in a floating and sleeving mode and is in key connection with the shaft core, and the stirring sleeve knife handle connecting seat is supported on the machine body through a second bearing seat; the machine body is provided with a second oil cylinder for driving the second bearing seat to move in the axial direction, the stirring sleeve is connected to the end of the stirring sleeve cutter handle connecting seat through a stirring sleeve cutter handle, the pressing sleeve cutter handle assembly comprises a pressing sleeve cutter handle and a pressing sleeve, and the pressing sleeve is connected to the end of the machine body.

Description

Technical Field

[0001] The invention is used in the field of friction stir welding, and particularly relates to a friction stir welding spindle and welding equipment. Background Art

[0002] Friction stir welding has the advantages of fast welding speed, small heat affected zone, small welding deformation, high welding strength and high welding efficiency. Friction stir welding has strict control requirements on the penetration depth of the welding tool, requiring its axial displacement (depth change) to be controllable. The friction shear resistance between the stirring sleeve and the welded material of friction stir welding generates friction heat. After the material softens and deforms, the stirring needle moves forward along the interface to be welded, and the thermoplasticized material moves backward to fill the gap between the two weldments to form a stable weld. Friction stir welding is widely used in various materials, and can realize the welding of low melting point metals such as aluminum and alloys, copper alloys, titanium alloys, steel materials, metal composite materials and various other metals.

[0003] The stirring sleeve and stirring needle of the stir friction welding equipment need to be driven by independent driving mechanisms according to their respective functions, which leads to the bloated structure of the entire welding equipment and cannot be integrated into a main shaft, making it difficult to meet current welding requirements. Summary of the invention

[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a friction stir welding spindle and a welding device.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] In the first aspect, a friction stir welding spindle comprises a body, a shaft core, a backfill needle handle assembly, a stirring sleeve handle assembly and a pressing sleeve handle assembly, wherein the shaft core is supported on the body through a first bearing seat, and the body is provided with a first oil cylinder that drives the first bearing seat to move axially, the backfill needle handle assembly comprises a backfill needle and a backfill needle handle, the backfill needle is connected to the end of the shaft core through the backfill needle handle, the stirring sleeve handle assembly comprises a stirring sleeve handle connecting seat, a stirring sleeve handle and a stirring sleeve, the stirring sleeve handle connecting seat is sleeved on the shaft core and is keyed to the shaft core The stirring sleeve handle connecting seat is supported on the machine body through a second bearing seat, and the machine body is provided with a second oil cylinder that drives the second bearing seat to move axially. The stirring sleeve is connected to the end of the stirring sleeve handle connecting seat through the stirring sleeve handle. The pressing sleeve handle assembly includes a pressing sleeve handle and a pressing sleeve. The pressing sleeve is connected to the end of the machine body through the pressing sleeve handle. The pressing sleeve is provided with a stirring sleeve through hole, and the stirring sleeve is provided with a backfilling needle through hole. The backfilling needle is axially inserted in the backfilling needle through hole, and the stirring sleeve is axially inserted in the stirring sleeve through hole.

[0007] In combination with the first aspect, in certain implementations of the first aspect, the stirring sleeve handle cover is arranged on the outside of the backfilling needle handle, and an axial gap is left between the stirring sleeve handle and the backfilling needle handle, and the clamping sleeve handle is arranged on the outside of the stirring sleeve handle, and an axial gap is left between the clamping sleeve handle and the stirring sleeve handle.

[0008] In combination with the first aspect and the above-mentioned implementations, in certain implementations of the first aspect, an inner hole of the shaft core is provided inside the shaft core, a pull rod assembly is provided in the inner hole of the shaft core, and the backfill needle handle is connected to the end of the shaft core through the pull rod assembly.

[0009] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, the outer wall surface of the first bearing seat is in contact with the inner wall surface of the body, and the first oil cylinder includes a first annular cavity arranged on the inner wall surface of the body and a first annular flange arranged on the outer wall surface of the first bearing seat, and the first annular flange is embedded in the first annular cavity and divides the first annular cavity into a first oil cavity and a second oil cavity distributed along the axial direction.

[0010] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, the machine body is provided with a first displacement sensor for detecting the axial displacement of the first bearing seat.

[0011] In combination with the first aspect and the above-mentioned implementations, in certain implementations of the first aspect, the outer wall surface of the second bearing seat is in contact with the inner wall surface of the machine body, and the second oil cylinder includes a second annular cavity arranged on the inner wall surface of the machine body and a second annular flange arranged on the outer wall surface of the second bearing seat, and the second annular flange is embedded in the second annular cavity and divides the second annular cavity into a third oil cavity and a fourth oil cavity distributed along the axial direction.

[0012] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, the machine body is provided with a second displacement sensor for detecting the axial displacement of the second bearing seat.

[0013] In combination with the first aspect and the above-mentioned implementation manner, in some implementation manners of the first aspect, the machine body is provided with a third oil cylinder for driving the clamping sleeve shank to move axially, the third oil cylinder includes a third annular cavity provided in the machine body and an annular piston provided in the third annular cavity, and the annular piston is connected to the clamping sleeve shank.

[0014] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, a motor assembly is also included, wherein the motor assembly includes a motor housing arranged at the rear end of a machine body, a stator arranged in the motor housing, a motor shaft supported by the motor housing through a bearing, and a rotor arranged on the motor shaft, the motor shaft is provided with a shaft core mounting hole, the shaft core is inserted into the shaft core mounting hole, and is key-connected to the motor shaft.

[0015] In a second aspect, a welding device comprises the friction stir welding spindle described in any implementation of the first aspect.

[0016] One of the above technical solutions has at least one of the following advantages or beneficial effects: In the technical solution of the present invention, the backfill needle handle assembly, the stirring sleeve handle assembly and the clamping sleeve handle assembly are sequentially arranged along the axial direction at the end of the stir friction welding spindle to form a triple handle structure, wherein the stirring sleeve is driven by the second oil cylinder to move axially, contact and separate with the welding workpiece, and further cooperate with the driven rotation of the shaft core to achieve welding, while the backfill needle is driven by the first oil cylinder to move axially to achieve solder backfilling. The present invention has the characteristics of simple structure, stable movement and space saving; the dual-cylinder drive can be partitioned to realize the coordinated work of the clamping sleeve handle and the backfill needle handle, the equipment has higher integration, and through the simplification of the structure, the operation is flexible, the spindle energy consumption is small, and the execution is stable.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 It is a schematic structural diagram of an embodiment of a friction stir welding spindle of the present invention;

[0020] Figure 2 yes Figure 1 A partial enlarged view of the middle part;

[0021] Figure 3 It is a schematic diagram of the structure of the first oil cylinder and the second oil cylinder in one embodiment of the friction stir welding main shaft of the present invention;

[0022] Figure 4 It is a schematic diagram of the structure of a motor assembly in one embodiment of a friction stir welding spindle of the present invention. DETAILED DESCRIPTION

[0023] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0024] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention.

[0025] In the present invention, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present invention, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0026] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0027] in, Figure 1 The reference direction of the embodiment of the present invention is given below. Figure 1 The embodiment of the present invention is described with reference to the direction shown.

[0028] See also Figure 1 , Figure 2 , Figure 3The embodiment of the present invention provides a friction stir welding spindle, including a body 100, a shaft core 200, a backfilling needle handle assembly 300, a stirring sleeve handle assembly 400 and a pressing sleeve handle assembly 500. The shaft core 200 is supported on the body 100 through a first bearing seat 201. The body 100 is provided with a first oil cylinder for driving the first bearing seat 201 to move axially. The backfilling needle handle assembly 300 includes a backfilling needle 301 and a backfilling needle handle 302. The backfilling needle 301 is connected to the shaft core 200 through the backfilling needle handle 302. At the end, the stirring sleeve handle assembly 400 includes a stirring sleeve handle connecting seat 401, a stirring sleeve handle 402 and a stirring sleeve 403. The stirring sleeve handle 402 connecting seat 401 is mounted on the shaft core 200 and is keyed to the shaft core 200 to ensure that the stirring sleeve handle connecting seat 401 can adjust the axial position along the shaft core 200 while also being able to rotate synchronously with the shaft core 200 through key cooperation. The key can be a spline, which drives the stirring sleeve handle assembly 400 to rotate through the spline transmission, and has the advantages of small space and stable transmission. The stirring sleeve handle connecting seat 401 is supported on the body 100 through the second bearing seat 404, and the body 100 is provided with a second oil cylinder for driving the second bearing seat 404 to move axially, and the stirring sleeve 403 is connected to the end of the stirring sleeve handle connecting seat 401 through the stirring sleeve handle 402, and the clamping sleeve handle assembly 500 includes a clamping sleeve handle 501 and a clamping sleeve 502, and the clamping sleeve 502 is connected to the end of the body 100 through the clamping sleeve handle 501, and the body 100 is provided with a third oil cylinder for driving the clamping sleeve handle 501 to move axially, the clamping sleeve 502 is provided with a stirring sleeve through hole 503, and the stirring sleeve 403 is provided with a backfilling needle through hole 405, and the backfilling needle 301 is axially inserted in the backfilling needle through hole 405, and the stirring sleeve 403 is axially inserted in the stirring sleeve through hole 503.

[0029] Combination Figure 1-Figure 3The general steps of performing welding work in the embodiment of the present invention are as follows: the workpiece to be welded is placed under the clamping sleeve handle 501, the workpiece to be welded is clamped by the clamping sleeve 502, and the welding process is fixed and completed; at the same time, the stirring sleeve 403 is clamped by the stirring sleeve handle 402 and driven by the second oil cylinder to move downward along the axial direction, the end face of the stirring sleeve 403 contacts the welding workpiece, and the backfill needle handle 302 is driven upward by the first oil cylinder at the same time, and a welding cavity is formed in the backfill needle through hole 405 of the stirring sleeve 403; the stirring sleeve 403 rotates at a high speed driven by the shaft core 200, and the two parts to be welded are rapidly heated under friction to form a melt, and part of the melt is absorbed into the welding cavity formed by the rising backfill needle 301 and the clamping sleeve 502, and the backfill needle 301 is squeezed downward like an injection device to fill, and the stirring sleeve 403 is synchronously extended and retracted upward, and the solution is rapidly filled into the surface of the welded part to form a weld point, and the surface of the weld point is flat without protrusions. In an embodiment of the present invention, the welding cavity formed by the backfill needle 301 and the clamping sleeve 502 can quickly and accurately complete the welding function, avoid slag overflow, and increase welding efficiency. After welding is completed, the entire spindle is lifted and moved to the target point, the backfill needle 301 is reset, the residual welding slag is pushed out, and a new point welding is performed again. In an embodiment of the present invention, the backfill needle handle assembly 300 and the stirring sleeve handle assembly 400 are different from the prior art. They are a set of synchronously rotating but reversely telescopic motion mechanisms, which are crucial for forming point welding of workpieces.

[0030] In the technical solution of the present invention, the backfill needle handle assembly 300, the stirring sleeve handle assembly 400 and the clamping sleeve handle assembly 500 are sequentially arranged along the axial direction at the end of the stir friction welding spindle to form a triple handle structure, wherein the stirring sleeve 403 is driven by the second oil cylinder to move along the axial direction, contact and separate with the welding workpiece, and further cooperate with the driven rotation of the shaft core 200 to achieve welding, while the backfill needle 301 is driven by the first oil cylinder to move along the axial direction to achieve solder backfilling. The present invention has the characteristics of simple structure, stable movement and space saving; the double-cylinder drive can realize the coordinated work of the clamping sleeve handle 501 and the backfill needle handle 302 in a partitioned manner, the equipment has higher integration, and through the simplification of the structure, the operation is flexible, the spindle energy consumption is small, and the execution is stable.

[0031] In some embodiments, see Figure 2 The stirring sleeve handle 402 is covered on the outside of the backfilling needle handle 302, and an axial gap is left between the stirring sleeve handle 402 and the backfilling needle handle 302 to avoid interference between the stirring sleeve handle 402 and the backfilling needle handle 302 when they float axially. The clamping sleeve handle 501 is arranged on the outside of the stirring sleeve handle 402, and an axial gap is left between the clamping sleeve handle 501 and the stirring sleeve handle 402 to avoid interference between the clamping sleeve handle 501 and the stirring sleeve handle 402 when they float axially.

[0032] In some embodiments, see Figure 1 , Figure 2 An inner hole 202 is provided inside the shaft core 200, and a pull rod assembly 203 is provided in the inner hole 202 of the shaft core. The backfill needle handle 302 is connected to the end of the shaft core 200 through the pull rod assembly 203. The pull rod assembly 203 includes a pull rod, a disc spring, a clamp, etc. The pull rod is automatically tightened upward under the action of the axial elastic force provided by the disc spring, and the backfill needle handle 302 is clamped to the end of the shaft core 200 through the clamp at the end. When the backfill needle handle assembly 300 needs to be replaced, the pull rod can be driven by the knife cylinder at the end of the shaft core 200 to move axially downward to release the backfill needle handle 302. This embodiment can quickly realize the connection and replacement of the backfill needle handle assembly 300 at the end of the shaft core 200, and the structure is more ingenious and streamlined.

[0033] It is understandable that the backfill needle handle 302 can also be connected to the shaft core 200 by interference fit, threaded connection, etc.

[0034] In some embodiments, see Figure 3 The outer wall surface of the first bearing seat 201 is in contact with the inner wall surface of the machine body 100. The first oil cylinder includes a first annular cavity 101 disposed on the inner wall surface of the machine body 100 and a first annular flange 204 disposed on the outer wall surface of the first bearing seat 201. The first annular flange 204 is embedded in the first annular cavity 101 and divides the first annular cavity 101 into a first oil cavity and a second oil cavity distributed along the axial direction. When it is necessary to adjust the axial displacement of the shaft core 200 to drive the backfill needle handle assembly 300 to achieve the backfilling function, the oil inlet and return of the first oil cavity and the second oil cavity can be controlled respectively through the oil circuit, thereby driving the first annular flange 204 to move axially in the first annular cavity 101. In this embodiment, the first oil cylinder is directly integrated between the machine body 100 and the first bearing seat 201, the structure is more streamlined, and the equipment integration is higher.

[0035] Among them, see Figure 1 The machine body 100 is provided with a first displacement sensor 102 for detecting the axial displacement of the first bearing seat 201. The extension amount of the backfilling needle 301 is controlled by the first oil cylinder drive, and the first displacement sensor 102 is relied on for detection and analysis and providing reliable feedback of the insertion depth through voltage. The feedback is transmitted to the system through voltage signal transmission, so that the hydraulic oil cylinder can drive and adjust the insertion depth of the backfilling needle 301, which is controllable and has strong detectability and controllability.

[0036] In some embodiments, see Figure 3, the outer wall surface of the second bearing seat 404 is in contact with the inner wall surface of the body 100, and the second oil cylinder includes a second annular cavity 103 arranged on the inner wall surface of the body 100 and a second annular flange 406 arranged on the outer wall surface of the second bearing seat 404, and the second annular flange 406 is embedded in the second annular cavity 103 and divides the second annular cavity 103 into a third oil cavity and a fourth oil cavity distributed along the axial direction. When it is necessary to adjust the axial displacement of the second bearing seat 404 to drive the stirring sleeve handle assembly 400 to achieve the telescopic function, the oil inlet and return of the third oil cavity and the fourth oil cavity can be controlled respectively through the oil circuit, thereby driving the second annular flange 406 to move axially in the second annular cavity 103. In this embodiment, the first oil cylinder is directly integrated between the body 100 and the second bearing seat 404, the structure is more streamlined, and the equipment integration is higher.

[0037] Among them, see Figure 1 The machine body 100 is provided with a second displacement sensor 104 for detecting the axial displacement of the second bearing seat 404. The extension amount of the stirring sleeve 403 is controlled by the second oil cylinder drive, and the second displacement sensor 104 is relied on for detection and analysis and providing reliable extension length feedback through voltage, which is fed back to the system through voltage signal transmission, so that the extension amount of the stirring sleeve 403 can be adjusted by the hydraulic oil cylinder drive, and thus the controllable and detectable controllable performance is strong.

[0038] In some embodiments, see Figure 1 The machine body 100 is provided with a third oil cylinder 105 for driving the clamping sleeve handle 501 to move axially. The third oil cylinder 105 includes a third annular cavity arranged on the machine body 100 and an annular piston arranged in the third annular cavity. The annular piston is connected to the clamping sleeve handle 501. Under the drive of the third oil cylinder 105, the clamping sleeve handle 501 drives the clamping sleeve 502 to clamp the workpiece to be welded, thereby ensuring the stability of the workpiece during the welding process.

[0039] The shaft core 200 can be driven to rotate by an external motor or a built-in motor. In some embodiments, see Figure 1 , Figure 4The friction stir welding spindle also includes a motor assembly 600, which includes a motor housing 601 disposed at the rear end of the body 100, a stator 602 disposed in the motor housing 601, a motor shaft 604 supported by the motor housing 601 through a bearing 603, and a rotor 605 disposed on the motor shaft 604. The motor shaft 604 is provided with a shaft core mounting hole, and the shaft core 200 is inserted into the shaft core mounting hole and connected with the motor shaft 604 by a key, so that the shaft core 200 can adjust the axial position along the shaft core mounting hole of the motor shaft 604, and can also rotate synchronously with the motor shaft 604 through key cooperation, wherein the key can be a spline, and the shaft core 200 is driven to rotate through the spline transmission, and the load motor assembly 600 is transmitted with torque, which has the advantages of small space, small vibration, stable transmission, etc. In this embodiment, the motor is directly integrated into the rear part of the body 100, and the structure is simpler and the movement is more stable. The motor assembly 600 is powered on, and instructions are given to the motor assembly 600. The motor is supported by the bearings to control the operation and stop of the motor. The motor shaft 604 and the bearings are fitted with an interference fit. The operating parameters of the motor assembly 600 are adjusted and controlled through the program. The motor assembly 600 is controlled and adjusted according to the required speed. The motor assembly 600 runs smoothly and can drive the rotation of the welding tool and the backfill needle 301.

[0040] An embodiment of the present invention further provides a welding device, comprising the friction stir welding spindle in any of the above embodiments.

[0041] In the description of this specification, the description with reference to the terms "example", "embodiment" or "some embodiments" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0042] Of course, the invention is not limited to the above-mentioned embodiments, and those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A friction stir welding spindle, characterized in that: The invention comprises a machine body, an axis core, a backfilling needle handle assembly, a stirring sleeve handle assembly and a pressing sleeve handle assembly, wherein the axis core is supported on the machine body through a first bearing seat, and the machine body is provided with a first oil cylinder driving the first bearing seat to move axially, the backfilling needle handle assembly comprises a backfilling needle and a backfilling needle handle, the backfilling needle is connected to the end of the axis core through the backfilling needle handle, the stirring sleeve handle assembly comprises a stirring sleeve handle connecting seat, a stirring sleeve handle and a stirring sleeve, the stirring sleeve handle connecting seat is sleeved on the axis core and is connected to the axis core key, the stirring sleeve handle The handle connecting seat is supported on the machine body through a second bearing seat, and the machine body is provided with a second oil cylinder driving the second bearing seat to move axially, and the stirring sleeve is connected to the end of the stirring sleeve handle connecting seat through the stirring sleeve handle, and the clamping sleeve handle assembly includes a clamping sleeve handle and a clamping sleeve, and the clamping sleeve is connected to the end of the machine body through the clamping sleeve handle, and the clamping sleeve is provided with a stirring sleeve through hole, and the stirring sleeve is provided with a backfilling needle through hole, and the backfilling needle is axially inserted in the backfilling needle through hole, and the stirring sleeve is axially inserted in the stirring sleeve through hole.

2. The friction stir welding spindle according to claim 1, characterized in that: The stirring sleeve handle cover is arranged on the outside of the backfilling needle handle, and an axial gap is left between the stirring sleeve handle and the backfilling needle handle; the pressing sleeve handle is arranged on the outside of the stirring sleeve handle, and an axial gap is left between the pressing sleeve handle and the stirring sleeve handle.

3. The friction stir welding spindle according to claim 1, characterized in that: An inner hole of the shaft core is provided inside the shaft core, and a pull rod assembly is provided in the inner hole of the shaft core. The backfill needle handle is connected to the end of the shaft core through the pull rod assembly.

4. The friction stir welding spindle according to claim 1, characterized in that: The outer wall surface of the first bearing seat is in contact with the inner wall surface of the machine body, and the first oil cylinder includes a first annular cavity arranged on the inner wall surface of the machine body and a first annular flange arranged on the outer wall surface of the first bearing seat, and the first annular flange is embedded in the first annular cavity and divides the first annular cavity into a first oil cavity and a second oil cavity distributed along the axial direction.

5. The friction stir welding spindle according to claim 4, characterized in that: The machine body is provided with a first displacement sensor for detecting the axial displacement of the first bearing seat.

6. The friction stir welding spindle according to claim 1, characterized in that: The outer wall surface of the second bearing seat is in contact with the inner wall surface of the machine body. The second oil cylinder includes a second annular cavity arranged on the inner wall surface of the machine body and a second annular flange arranged on the outer wall surface of the second bearing seat. The second annular flange is embedded in the second annular cavity and divides the second annular cavity into a third oil cavity and a fourth oil cavity distributed along the axial direction.

7. The friction stir welding spindle according to claim 6, characterized in that: The machine body is provided with a second displacement sensor for detecting the axial displacement of the second bearing seat.

8. The friction stir welding spindle according to claim 1, characterized in that: The machine body is provided with a third oil cylinder for driving the clamping sleeve handle to move axially. The third oil cylinder comprises a third annular cavity provided in the machine body and an annular piston provided in the third annular cavity. The annular piston is connected to the clamping sleeve handle.

9. The friction stir welding spindle according to claim 1, characterized in that: It also includes a motor assembly, which includes a motor housing arranged at the rear end of the machine body, a stator arranged in the motor housing, a motor shaft supported by the motor housing through a bearing, and a rotor arranged on the motor shaft, the motor shaft is provided with a shaft core mounting hole, the shaft core is inserted into the shaft core mounting hole, and is key-connected to the motor shaft.

10. A welding device, characterized in that: A friction stir welding spindle comprising the friction stir welding spindle according to any one of claims 1 to 9.

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