A friction stir welding equipment capable of grading the rotational speed for thick plates

Abstract

The application provides a friction stir welding equipment capable of grading and adjusting rotating speed for thick plates, which comprises a welding equipment body, a split stir pin arranged at the front end of the welding equipment body, at least a first rotating device and a second rotating device arranged in the welding equipment body, wherein the split stir pin comprises at least a first stir pin and a second stir pin, the first rotating device and the second rotating device are used for driving the first stir pin and the second stir pin respectively, a sealing groove is arranged at the connection of the first stir pin and the second stir pin, and the first stir pin and the second stir pin are sealed by cooperating with sealing balls through the sealing groove to realize relative rotation. At least two sets of rotating devices are arranged in the application to realize different rotating speeds of the sections of the split stir pin, so that the input heat of the plate along the thickness direction is uniform, and the welding defects caused by the non-uniform heat input during the welding of the thick plate can be effectively solved.

Description

Technical Field

[0001] This invention relates to the field of friction stir welding technology, and in particular to a friction stir welding equipment for thick plates with adjustable rotation speed in stages. Background Technology

[0002] Friction stir welding is a technique that utilizes the intense friction between a high-speed rotating stirring head shoulder and stirring pins and the workpiece to generate heat. This raises the temperature of the joint, causing the softened material to undergo plastic flow under the influence of the stirring pins, ultimately forming a bond. Since its invention, this technology has become a practical industrial solid-state joining technique that can replace fusion welding, particularly in the manufacture of non-ferrous metals, especially aluminum alloys, due to the excellent mechanical properties and minimal welding deformation of its weld joints.

[0003] Currently, there are many types of stirring heads used in friction stir welding, but most are one-piece designs, meaning the entire stirring head can only rotate at the same speed. The stirring pin has a larger diameter at the root and a smaller diameter at the tip, forming a cone shape, resulting in varying contact areas with the workpiece. At the same rotational speed, the heat input along the thickness direction of the workpiece is uneven; furthermore, the frictional heat generated between the shoulder and the workpiece surface exacerbates this uneven heat input. Especially for thick plate welding, this uneven heat input leads to insufficient stirring and incomplete penetration at the bottom of the workpiece, easily causing defects. Summary of the Invention

[0004] To address the aforementioned problems, this invention aims to propose a friction stir welding equipment with adjustable rotation speed for thick plates. It features a split-type stirring pin with at least two sets of rotating devices, allowing different rotation speeds for each segment of the split-type stirring pin. This ensures uniform heat input along the thickness direction of the plate, effectively resolving welding defects caused by uneven heat input during thick plate welding.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] A friction stir welding equipment for thick plates with adjustable rotation speed includes a welding equipment body. The front end of the welding equipment body is provided with a split stirring pin. The equipment body is provided with at least a first rotating device and a second rotating device. The split stirring pin includes at least a first stirring pin and a second stirring pin. The first rotating device and the second rotating device drive the first stirring pin and the second stirring pin respectively. The connection between the first stirring pin and the second stirring pin is provided with a sealing groove. The first stirring pin and the second stirring pin are connected by a sealing ball through the sealing groove to achieve relative rotation.

[0007] Furthermore, the first rotating device includes a first stirring pin fixed top cylinder fixedly installed inside the welding equipment body. The bottom end of the first stirring pin fixed top cylinder is rotatably connected to a first rotating cylinder. A first rotating cylinder large bevel gear is sleeved on the first rotating cylinder. A first motor is fixedly installed inside the welding equipment body. The first motor drives the first rotating cylinder to rotate through the meshing of the first rotating cylinder small bevel gear and the first rotating cylinder large bevel gear. The bottom end of the first rotating cylinder supports and is rotatably connected to the bottom of the welding equipment body and is driven to connect to the first stirring pin through a transition device.

[0008] Furthermore, the second rotating device includes a second stirring pin fixed top cylinder fixedly installed inside the welding equipment body. The bottom end of the second stirring pin fixed top cylinder is rotatably connected to a second rotating cylinder. A large bevel gear of the second rotating cylinder is sleeved on the second rotating cylinder. A second motor is fixedly installed inside the welding equipment body. The rotating shaft of the second motor passes through the side wall hole of the first stirring pin fixed top cylinder and meshes with the small bevel gear and the large bevel gear of the second rotating cylinder to drive the second rotating cylinder to rotate. The second rotating cylinder and the first rotating cylinder are placed coaxially and are fixed by the upper and lower limits of the rotating fixed bearing. The bottom end of the second rotating cylinder is driven to connect to the second stirring pin through a transition device.

[0009] Furthermore, the transition device includes a cylindrical transition shaft and a rod-type transition shaft. The cylindrical transition shaft is bolted to the first rotating cylinder via a large flange; the rod-type transition shaft is bolted to the second rotating cylinder via a small flange; the cylindrical transition shaft and the rod-type transition shaft are connected via a transition fixed bearing, and the two can rotate relative to each other; the cylindrical transition shaft is connected to the first stirring needle via a cylindrical transition shaft threaded post; and the rod-type transition shaft is threaded to the second stirring needle.

[0010] Furthermore, the top of the first rotating cylinder and the bottom of the first stirring needle fixed top cylinder are provided with annular ball bearing grooves, in which balls are placed. The two can rotate relative to each other but cannot move up and down with the help of the balls. The top of the second rotating cylinder and the bottom of the second stirring needle fixed top cylinder are provided with annular ball bearing grooves, in which balls are placed. The two can rotate relative to each other but cannot move up and down with the help of the balls. A ball bearing is placed between the annular ball bearing groove on the lower wall of the first rotating cylinder and the annular ball bearing groove on the bottom of the welding equipment body.

[0011] Furthermore, it also includes a clamping device, which includes clamping plates and clamping plate bases. The clamping plate bases are connected and fixed to the inner wall of the welding equipment body. There are two clamping plates, which are arranged opposite each other and achieve relative sliding clamping through two parallel sliding grooves on the clamping plate bases. Both the clamping plates and the side wall of the first rotating cylinder have annular ball sliding grooves and place balls thereon. When the first rotating cylinder is clamped by adjusting the two clamping plates, the relative rotation of the first rotating cylinder can be achieved by the balls.

[0012] Furthermore, it also includes an adjusting bolt and a limiting bolt base. The limiting bolt base is connected to the clamping plate base by bolts. The adjusting bolt is threaded to the side of the limiting bolt base and is used to drive one of the clamping plates to move left and right along the sliding groove. The upper and lower ends of the two clamping plates are provided with a first transmission rectangular rack and a second transmission rectangular rack, respectively. The first transmission rectangular rack and the second transmission rectangular rack mesh with a spur gear installed on the clamping plate base. The first transmission rectangular rack and the second transmission rectangular rack are respectively fixedly connected to the two clamping plates by hexagonal nuts and fixing bolts. When adjusted by the adjusting bolt, there is space between the two clamping plates that allows the first transmission rectangular rack, the second transmission rectangular rack, and the spur gear to pass through.

[0013] Furthermore, one clamping plate device is placed at intervals along the top and bottom of the first rotating cylinder.

[0014] Furthermore, the welding equipment body is a box-shaped shell, which is welded to the top plate and bottom plate through the left side wall, right side wall, front and rear side walls.

[0015] Furthermore, the split stirring needle is conical, with the first stirring needle located at the root and the second stirring needle located at the tip.

[0016] Beneficial effects: The present invention sets up a split stirring pin with at least two sets of rotating devices to achieve different rotation speeds for each segment of the split stirring pin, so that the heat input along the thickness direction of the plate is uniform, which can effectively solve the welding defects caused by uneven heat input when welding thick plates. Attached Figure Description

[0017] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 This is a schematic diagram of the overall structure of the friction stir welding equipment for thick plates with adjustable rotation speed according to an embodiment of the present invention.

[0019] Figure 2 This is a front view of the internal structure of the friction stir welding equipment for thick plates with adjustable rotation speed according to an embodiment of the present invention.

[0020] Figure 3 This is an exploded view of the internal structure of the friction stir welding equipment for thick plates with adjustable rotation speed according to an embodiment of the present invention.

[0021] Figure 4This is a schematic diagram of the cooperation between the second rotating device and the stirring pin of the friction stir welding equipment for thick plates with adjustable rotation speed according to an embodiment of the present invention.

[0022] Figure 5 This is a top view of the clamping plate device of the friction stir welding equipment for thick plates with adjustable rotation speed according to an embodiment of the present invention.

[0023] Figure 6 This is a perspective view of the clamping plate device of the friction stir welding equipment for thick plates with adjustable rotation speed according to an embodiment of the present invention.

[0024] Figure 7 This is an exploded view of a portion of the first rotating device, the second rotating device, and the stirring pin of the friction stir welding equipment for thick plates with graded adjustable rotation speed as described in an embodiment of the present invention.

[0025] Figure 8 This is an exploded view of the stirring pin of the friction stir welding equipment for thick plates with graded adjustable rotation speed, as described in an embodiment of the present invention.

[0026] Figure 9 This is an exploded cross-sectional view of the stirring pin of the friction stir welding equipment for thick plates with adjustable rotation speed as described in an embodiment of the present invention.

[0027] Figure 10 This is a cross-sectional view of the stirring pin of the friction stir welding equipment for thick plates with adjustable rotation speed according to an embodiment of the present invention.

[0028] Figure 11 This is a schematic diagram showing the interaction between the first rotating cylinder and the base plate of the welding equipment body in the friction stir welding equipment for thick plates with adjustable rotation speed according to an embodiment of the present invention. Detailed Implementation

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0030] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] Example 1

[0032] See Figure 1-11A friction stir welding equipment for thick plates with adjustable rotation speed includes a welding equipment body 1. The welding equipment body 1 has a split-type stirring pin 3 at its front end. The equipment body 1 has at least a first rotating device and a second rotating device inside. The split-type stirring pin 3 includes at least a first stirring pin 301 and a second stirring pin 303. The first rotating device and the second rotating device drive the first stirring pin 301 and the second stirring pin 303 respectively. The connection between the first stirring pin 301 and the second stirring pin 303 is provided with a sealing groove 304. The first stirring pin 301 and the second stirring pin 303 are rotated relative to each other by the sealing groove 304 and the sealing ball 302.

[0033] This embodiment uses a split stirring needle with at least two sets of rotating devices. By using different rotation speeds, the heat input along the thickness direction of the plate can be made uniform, which can effectively solve the welding defects caused by uneven heat input when welding thick plates.

[0034] It should be noted that the welding heat at the upper and lower positions of the thick plate in this embodiment can be monitored by infrared. When the welding heat is low, the stirring needle speed at the corresponding position is increased by computer control, so as to achieve uniform heat input in each section of the thick plate.

[0035] In a specific example, the first rotating device includes a first stirring pin fixed top cylinder 4 fixedly installed inside the welding equipment body 1. The bottom end of the first stirring pin fixed top cylinder 4 is rotatably connected to a first rotating cylinder 8. A first rotating cylinder large bevel gear 11 is sleeved on the first rotating cylinder 8. A first motor 7 is fixedly installed inside the welding equipment body 1. The first motor 7 drives the first rotating cylinder 8 to rotate by meshing with the first rotating cylinder small bevel gear 12 and the first rotating cylinder large bevel gear 11. The bottom end of the first rotating cylinder 8 is supported and rotatably connected to the bottom of the welding equipment body 1 and driven to connect to the first stirring pin 301 through a transition device 2.

[0036] In this embodiment, the first rotating cylinder can be driven to rotate by the first motor in conjunction with the small bevel gear and the large bevel gear of the first rotating cylinder. Since the first rotating cylinder is installed between the fixed top cylinder of the first stirring needle and the bottom of the welding equipment body, the first rotating cylinder can only rotate in place and cannot move up and down, thereby stably driving the first stirring needle to rotate at the first set speed.

[0037] In a specific example, the second rotating device includes a second stirring needle fixed top cylinder 5 fixedly installed inside the welding equipment body 1. The bottom end of the second stirring needle fixed top cylinder 5 is rotatably connected to a second rotating cylinder 9. A second rotating cylinder large bevel gear 13 is sleeved on the second rotating cylinder 9. A second motor 6 is fixedly installed inside the welding equipment body 1. The rotating shaft of the second motor 6 passes through the side wall hole 401 of the first stirring needle fixed top cylinder 4 and meshes with the second rotating cylinder small bevel gear 14 and the second rotating cylinder large bevel gear 13 to drive the second rotating cylinder 9 to rotate. The second rotating cylinder 9 and the first rotating cylinder 8 are placed coaxially and are fixed by a rotating fixed bearing 15 for upper and lower limit. The bottom end of the second rotating cylinder 9 is driven to connect to the second stirring needle 302 through a transition device 2.

[0038] In this embodiment, the second rotating cylinder can be driven to rotate by the second motor in conjunction with the small bevel gear and the large bevel gear of the second rotating cylinder. Since the second rotating cylinder is rotated by rotating fixed bearing and is installed on the inner wall of the first rotating cylinder with upper and lower limits, the second rotating cylinder can only rotate in place and cannot move up and down, thereby stably driving the second stirring needle to rotate at the second-stage set speed.

[0039] In this embodiment, two rotating fixed bearings are provided at intervals to improve the rotational stability between the second rotating cylinder and the first rotating cylinder.

[0040] In a specific example, the transition device 2 includes a cylindrical transition shaft 201 and a rod-type transition shaft 202. The cylindrical transition shaft 201 is bolted to the first rotating cylinder 8 via a large flange 204; the rod-type transition shaft 202 is bolted to the second rotating cylinder 9 via a small flange 205; the cylindrical transition shaft 201 and the rod-type transition shaft 202 are connected by a transition fixed bearing 16, and the two can rotate relative to each other; the cylindrical transition shaft 201 is connected to the first stirring needle 301 via a cylindrical transition shaft threaded post 203; and the rod-type transition shaft 202 is threaded to the second stirring needle 303.

[0041] In this embodiment, the first rotating cylinder, the second rotating cylinder, and the transition device are all connected by bolts through corresponding flanges; the transition device and the stirring needle are connected by threads, which facilitates maintenance and disassembly.

[0042] Additionally, it should be noted that the outer diameter of the large flange is slightly smaller than the outer diameter of the first transmission cylinder; thus, when the large flange is connected and installed to the bottom of the first rotating cylinder, it will not affect the rotational support of the annular ball groove on the lower wall of the first rotating cylinder and the annular ball groove at the bottom of the welding equipment body. The flange connection can ensure that the rotation of the upper rotating device can be transmitted downward to the transition device; the cylindrical transition shaft and the rod transition shaft are placed coaxially and connected by a transition fixed bearing, so that they can rotate relative to each other without sliding up and down.

[0043] In a specific example, the top end of the first rotating cylinder 8 and the bottom end of the first stirring needle fixed top cylinder 4 are provided with annular ball bearing grooves containing balls. The two can rotate relative to each other but cannot move up and down with the help of the balls. The top end of the second rotating cylinder 9 and the bottom end of the second stirring needle fixed top cylinder 5 are provided with annular ball bearing grooves containing balls. The two can rotate relative to each other but cannot move up and down with the help of the balls. A ball bearing is placed between the annular ball bearing groove on the lower wall of the first rotating cylinder 8 and the annular ball bearing groove at the bottom of the welding equipment body 1.

[0044] In this embodiment, the first rotating cylinder and the first stirring pin fixed top cylinder, the top of the second rotating cylinder and the second stirring pin fixed top cylinder, and the first rotating cylinder and the bottom of the welding equipment body are all connected by annular ball grooves and ball bearings. This reduces rotational friction and prevents the entire device from moving up and down when subjected to forging force.

[0045] In a specific example, a clamping device 10 is also included. The clamping device 10 includes a clamping plate 1011 and a clamping plate base 1008. The clamping plate base 1008 is connected and fixed to the inner wall of the welding equipment body 1. There are two clamping plates 1011, which are arranged opposite each other and are relatively slidably clamped through two parallel sliding slots 1010 on the clamping plate base 1008. Both the clamping plate 1011 and the side wall of the first rotating cylinder 8 have annular ball sliding grooves 1009 and ball bearings are placed therein. When the first rotating cylinder 8 is clamped by adjusting the two clamping plates 1011, the relative rotation of the first rotating cylinder 8 can be achieved by the ball bearings.

[0046] It should be noted that the clamping plate base of the clamping plate device in this embodiment is provided with through holes that allow the first rotating cylinder to pass through, and the opposite sides of the two clamping plates are provided with semi-circular notches. The ring ball sliding groove cooperates with the ball to achieve relative rotation when the clamping plate device clamps the first rotating cylinder without swaying left and right.

[0047] In a specific example, it also includes an adjusting bolt 1006 and a limiting bolt base 1007, the limiting bolt base 1007 being connected to the clamping plate base 1008 by bolts; the adjusting bolt 1006 is threaded to the side of the limiting bolt base 1007 and is used to drive one of the clamping plates 1011 to move left and right along the sliding groove 1010; the upper and lower ends of the two clamping plates 1011 are provided with a parallel first transmission rectangular rack 1003 and a second transmission rectangular rack 1004, the first transmission rectangular rack 1004... 003. The second transmission rectangular rack 1004 meshes with the spur gear 1005 mounted on the clamping plate base 1008. The first transmission rectangular rack 1003 and the second transmission rectangular rack 1004 are fixedly connected to the two clamping plates 1011 respectively by hexagonal nuts 1001 and fixing bolts 1002. When adjusted by adjusting bolts 1006, there is a space between the two clamping plates 1011 that allows the first transmission rectangular rack 1003, the second transmission rectangular rack 1004 and the spur gear 1005 to pass through.

[0048] In this embodiment, by tightening the adjusting bolts, the two clamping plates will move towards the center. The clamping plates drive the first transmission rectangular rack to move. When the first transmission rectangular rack moves, due to the transmission between the gears, it will drive the spur gear to rotate. At the same time, the rotation of the spur gear will drive the second transmission rectangular rack to move. The movement of the second transmission rectangular rack will drive the other clamping plate to move towards the center, causing both clamping plates to move towards the center, thereby clamping the first rotating cylinder.

[0049] In a specific example, one clamping plate device 10 is placed at intervals above and below the first rotating cylinder 8.

[0050] In this embodiment, since the first rotating cylinder is relatively long, a clamping plate device is placed at intervals above and below the first rotating cylinder to make the first rotating cylinder more stable during rotation and prevent it from swaying back and forth or left and right.

[0051] In a specific example, the welding equipment body 1 is a box-shaped shell, which is welded to the top plate 103 and the bottom plate 104 through the left side wall 101, the right side wall 102, and the front and rear side walls (not shown).

[0052] In a specific example, the split stirring needle 3 is conical, with the first stirring needle 301 located at the root and the second stirring needle 303 located at the tip.

[0053] Since the split stirring needle in this embodiment is conical, the root diameter of the stirring needle is larger and the tip diameter is smaller, forming a cone shape with different contact areas with the plate. Therefore, the first stirring needle and the second stirring needle can be set to different rotation speeds through their respective first and second rotating devices, which can make the heat input of the plate uniform along the thickness direction.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A friction stir welding equipment with adjustable rotation speed for thick plates, characterized in that, The equipment includes a welding equipment body (1), the front end of which is provided with a split stirring pin (3), and at least a first rotating device and a second rotating device are provided inside. The split stirring pin (3) includes at least a first stirring pin (301) and a second stirring pin (303). The first rotating device and the second rotating device respectively drive the first stirring pin (301) and the second stirring pin (303). The connection between the first stirring pin (301) and the second stirring pin (303) is provided with a sealing groove (304). The first stirring pin (301) and the second stirring pin (303) are connected by a sealing ball (302) through the sealing groove (304) to achieve relative rotation. The first rotating device includes a fixed... The first stirring pin fixed top cylinder (4) is installed inside the welding equipment body (1). The bottom end of the first stirring pin fixed top cylinder (4) is rotatably connected to the first rotating cylinder (8). The first rotating cylinder (8) is sleeved with the first rotating cylinder large bevel gear (11). The welding equipment body (1) is fixedly installed with the first motor (7). The first motor (7) meshes with the first rotating cylinder small bevel gear (12) and the first rotating cylinder large bevel gear (11) to drive the first rotating cylinder (8) to rotate. The bottom end of the first rotating cylinder (8) is supported and rotatably connected to the bottom of the welding equipment body (1) and driven to connect to the first stirring pin (301) through the transition device (2). The second rotating device includes a fixedly installed part of the welding equipment body (1). 1) The second stirring needle fixed top cylinder (5) is rotatably connected to the bottom end of the second stirring needle fixed top cylinder (5). The second rotating cylinder (9) is fitted with a large bevel gear (13). The welding equipment body (1) is fixedly installed with a second motor (6). The rotating shaft of the second motor (6) passes through the side wall hole (401) of the first stirring needle fixed top cylinder (4) and engages with the small bevel gear (14) and the large bevel gear (13) of the second rotating cylinder to drive the second rotating cylinder (9) to rotate. The second rotating cylinder (9) and the first rotating cylinder (8) are placed coaxially and are fixed by a rotating fixed bearing (15) in the left and right circumferential directions. The bottom end of the second rotating cylinder (9) is connected by The transition device (2) drives the connection of the second stirring needle (303). The transition device (2) includes a cylindrical transition shaft (201) and a rod transition shaft (202). The cylindrical transition shaft (201) is bolted to the first rotating cylinder (8) by a large flange (204). The rod transition shaft (202) is bolted to the second rotating cylinder (9) by a small flange (205). The cylindrical transition shaft (201) and the rod transition shaft (202) are fixedly connected by a transition fixed bearing (16) in the left and right circumferential directions, and the two can rotate relative to each other. The cylindrical transition shaft (201) is connected to the first stirring needle (301) by a cylindrical transition shaft threaded column (203). The rod transition shaft (202) is connected to the second stirring needle (303) by a thread.

2. The friction stir welding equipment for thick plates with adjustable rotation speed according to claim 1, characterized in that, The top of the first rotating cylinder (8) and the bottom of the first stirring needle fixed top cylinder (4) have annular ball grooves, in which balls are placed. The two can rotate relative to each other but cannot move up and down with the help of the balls. The top of the second rotating cylinder (9) and the bottom of the second stirring needle fixed top cylinder (5) have annular ball grooves, in which balls are placed. The two can rotate relative to each other but cannot move up and down with the help of the balls. A ball is placed between the annular ball groove on the lower wall of the first rotating cylinder (8) and the annular ball groove at the bottom of the welding equipment body (1).

3. The friction stir welding equipment for thick plates with adjustable rotation speed according to claim 1, characterized in that, It also includes a clamping device (10), which includes a clamping plate (1011) and a clamping plate base (1008). The clamping plate base (1008) is connected and fixed to the inner wall of the welding equipment body (1). There are two clamping plates (1011), which are arranged opposite each other and are relatively slidably clamped through two parallel sliding slots (1010) on the clamping plate base (1008). Both the clamping plate (1011) and the side wall of the first rotating cylinder (8) have annular ball sliding grooves (1009) and ball bearings are placed therein. When the first rotating cylinder (8) is clamped by adjusting the two clamping plates (1011), the relative rotation of the first rotating cylinder (8) can be achieved through the ball bearings.

4. The friction stir welding equipment for thick plates with adjustable rotation speed according to claim 3, characterized in that, It also includes an adjusting bolt (1006) and a limiting bolt base (1007), the limiting bolt base (1007) being connected to the clamping plate base (1008) by bolts; the adjusting bolt (1006) is threaded to the side of the limiting bolt base (1007) and is used to drive one of the clamping plates (1011) to move left and right along the sliding groove (1010), the upper and lower ends of the two clamping plates (1011) are provided with a first transmission rectangular rack (1003) and a second transmission rectangular rack (1004) in parallel, the first transmission rectangular rack (1003) and the second transmission rectangular rack (1004) are provided with parallel, the first transmission rectangular rack (1003) and the second transmission rectangular rack (1004) are provided with parallel, the first transmission rectangular rack (1003) and the second transmission rectangular rack (1004) are provided with parallel, the first transmission rectangular rack (1003) and the second transmission rectangular rack (1004) are provided with parallel, the first transmission rectangular rack (1003) and the second transmission rectangular rack (1004) are provided with parallel, the first transmission rectangular rack (1003) and the second transmission rectangular rack (1004) are provided with parallel, the first transmission rectangular rack (1004 ... The transmission rectangular racks (1004) mesh with the spur gears (1005) mounted on the clamping plate base (1008). The first transmission rectangular rack (1003) and the second transmission rectangular rack (1004) are fixedly connected to the two clamping plates (1011) respectively by hexagonal nuts (1001) and fixing bolts (1002). When adjusted by adjusting bolts (1006), there is space between the two clamping plates (1011) to allow the first transmission rectangular rack (1003), the second transmission rectangular rack (1004) and the spur gear (1005) to pass through.

5. The friction stir welding equipment for thick plates with adjustable rotation speed according to claim 3, characterized in that, One clamping plate device (10) is placed at intervals above and below the first rotating cylinder (8).

6. The friction stir welding equipment for thick plates with adjustable rotation speed according to claim 1, characterized in that, The welding equipment body (1) is a box-shaped shell, which is welded together by the left side wall (101), the right side wall (102), the front and rear side walls, the top plate (103), and the bottom plate (104).

7. The friction stir welding equipment for thick plates with adjustable rotation speed according to claim 1, characterized in that, The split stirring needle (3) is conical, with the first stirring needle (301) located at the root and the second stirring needle (303) located at the tip.

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