Friction stir welding equipment capable of realizing constant pressure control

Abstract

The invention relates to the technical field of friction stir welding equipment, in particular to friction stir welding equipment capable of realizing constant pressure control, which comprises a base, a supporting column is fixedly connected to the upper surface of the base, a protective shell is fixedly connected to the upper surface of the supporting column, and a limiting groove is formed in the supporting column. And a guide rod is fixedly connected to the interior of the limiting groove, a supporting plate is slidably connected to the interior of the limiting groove, the supporting plate is slidably connected to the outer wall of the guide rod, and a welding mechanism is installed in the supporting plate. A first motor drives a bidirectional lead screw to rotate and drives a first sliding rod and a second sliding rod to slide, so that a first connecting rod and a second connecting rod rotate by an angle, and then lifting of a supporting plate is adjusted, the supporting plate slides in a limiting groove and on the outer wall of a guide rod in a limited mode, the guide rod provides guiding, the first connecting rod and the second connecting rod support the lifted supporting plate, and the supporting effect and the constant pressure are enhanced; the supporting plate is prevented from being damaged due to upward movement in the welding process, and welding efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of friction stir welding equipment, and in particular to friction stir welding equipment capable of realizing constant pressure control. Background Art

[0002] Friction stir welding equipment is a special equipment used to achieve friction stir welding. Friction stir welding is a solid-state welding technology that generates heat through the rotation and movement of the stirring head to soften the material and achieve connection. Friction stir welding equipment is widely used in aerospace, automobile manufacturing, rail transportation and shipbuilding.

[0003] When applying for the present invention, the applicant found through search that a Chinese patent disclosed a "friction stir welding device capable of realizing constant pressure control", and its application number is "CN202120941645.0". The utility model discloses a friction stir welding device capable of realizing constant pressure control, including an upper seat and a base arranged up and down, at least four guide pillars are arranged between the upper seat and the base, and a spindle seat is also arranged in parallel between the upper seat and the base, and the spindle seat is movably sleeved on the guide pillars, a friction stir welding spindle is fixed on the spindle seat, and the spindle seat realizes movement in the Y-axis direction through a screw adjustment mechanism. The screw adjustment mechanism includes a servo motor, a reducer, a screw and a screw slider. The servo motor is arranged at the upper end of the upper seat, and the output end of the servo motor is connected to the screw through the reducer, and the screw slider is arranged on the spindle seat. The patent mainly realizes movement of the spindle seat in the Y-axis direction through the screw adjustment mechanism, so that the friction stir spindle on the spindle seat moves synchronously, thereby realizing constant pressure control during the friction stir welding process, and the stability is good.

[0004] With respect to the above-mentioned comparative documents, the utility model only realizes the lifting and lowering functions by driving the screw to rotate through a servo motor, and realizes constant pressure control during the stir friction welding process through the self-locking property of the screw. However, during the stir friction welding process, the spindle seat may easily move up and down due to shaking during the stir friction welding process, which may cause the spindle seat to break and be damaged. Therefore, only realizing lifting and constant pressure control through a screw is not stable enough, and will also affect the effect of stir friction welding. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a friction stir welding device that can achieve constant pressure control.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a stir friction welding device capable of realizing constant pressure control, comprising a base, a support column fixedly connected to the upper surface of the base, a protective shell fixedly connected to the upper surface of the support column, a limiting groove is provided inside the support column, a guide rod is fixedly connected inside the limiting groove, a support plate is slidably connected inside the limiting groove, the support plate is slidably connected to the outer wall of the guide rod, a welding mechanism is installed inside the support plate, an adjusting mechanism is installed inside the protective shell, the adjusting mechanism comprises a motor 1, a main body end of the motor 1 is fixedly connected to the outer wall of the protective shell On the left side of the wall, the output end of the motor 1 is fixedly connected with a bidirectional screw rod, and the bidirectional screw rod is rotatably connected to the inside of the protective shell, and an auxiliary mechanism is installed inside the protective shell, and the auxiliary mechanism includes a slide rod 1 and a slide rod 2, and a slide groove is opened inside the protective shell, and the slide rod 1 and the slide rod 2 are slidably connected inside the slide groove, the slide rod 1 is threadedly connected to the outer wall of the bidirectional screw rod, and the slide rod 2 is threadedly connected to the outer wall of the bidirectional screw rod, the outer wall of the slide rod 1 is rotatably connected with a connecting rod 1, and the outer wall of the slide rod 2 is rotatably connected with a connecting rod 2, the connecting rod 1 is rotatably connected to the outer wall of the support plate, and the connecting rod 2 is rotatably connected to the outer wall of the support plate.

[0007] By starting motor 1, motor 1 drives the bidirectional lead screw to rotate, and the rotation of the bidirectional lead screw drives slide bar 1 and slide bar 2 to slide in opposite directions, thereby prompting connecting rod 1 and connecting rod 2 to rotate at an angle to drive the support plate to be raised and lowered. During the lifting process of the support plate, the limit slide is limited in the limit groove and on the outer wall of the guide rod, and a guiding role is played by the guide rod. Since connecting rod 1 and connecting rod 2 are arranged on both sides of the outer wall of slide bar 1, slide bar 2 and the support plate, connecting rod 1 and connecting rod 2 are used to support the support plate after the lifting adjustment, thereby improving the supporting effect of the support plate and increasing the constant pressure on the support plate, thereby preventing the support plate from being damaged due to upward movement during welding due to the operation of the welding mechanism, thereby further improving the welding work efficiency.

[0008] Further: the sliding rod 1 and the sliding rod 2 are symmetrically arranged, the connecting rod 1 is provided with two, and the two connecting rods 1 are arranged on both sides of the outer wall of the sliding rod 1 and the support plate, and the connecting rod 2 is provided with two, and the two connecting rods 2 are arranged on both sides of the outer wall of the sliding rod 1 and the support plate.

[0009] The connecting rod one and the connecting rod two are arranged into two symmetrical groups, which can improve the supporting force and constant pressure on the support plate and ensure the stability of the support plate during the lifting process.

[0010] Further: the welding mechanism includes motor 2 and a welding head, the main end of motor 2 is fixedly connected to the upper surface of the support plate, the output end of motor 2 is fixedly connected to the upper end of the welding head, and the welding head is arranged on the lower surface of the support plate.

[0011] The second motor is used to drive the welding head to rotate, and the adjustment mechanism and the auxiliary mechanism are combined to drive the support plate to rise and fall, so that the welding head is brought into contact with the workpiece to be welded, and the workpiece is subjected to stir friction welding through the rotation of the welding head.

[0012] Further: the outer wall of the base is fixedly connected with a motor three, the motor three is arranged on the right side of the outer wall of the base, the output end of the motor three is fixedly connected with a screw shaft, and the screw shaft is rotatably connected to the inside of the base.

[0013] Motor three drives the screw shaft to rotate, and the screw shaft is limited to rotate inside the base, and the auxiliary support seat is translated and adjusted.

[0014] Further: the outer wall of the screw shaft is threadedly connected to a support seat, and the support seat is slidably connected to the inside of the base.

[0015] The rotation of the screw shaft drives the support seat to slide in translation inside the base, and the movement of the support seat is used to assist the workpiece in lateral translation adjustment during the welding process.

[0016] Further: an electric telescopic rod is fixedly connected to one side of the outer wall of the support seat, a telescopic end of the electric telescopic rod is fixedly connected to a welding platform, and the welding platform is slidably connected to the inside of the support seat.

[0017] The welding table is driven to move by an electric telescopic rod, so that the welding table can slide horizontally inside the support seat. The welding table is used to place the workpiece to be welded, and the workpiece can be adjusted by longitudinal translation through the movement of the welding table.

[0018] Further: the outer wall of the welding table is fixedly connected to a limit rod, the limit rod is slidably connected to the inside of the support seat, two limit rods are provided, and the two limit rods are arranged on both sides of the outer wall of the electric telescopic rod.

[0019] The limiting rod slides within the support seat during the sliding process of the welding table, and the movement of the welding table is limited by the limiting rod to prevent the welding table from excessively moving and escaping from the inside of the support seat.

[0020] Further: the inner thread of the welding table is connected with a bolt, the outer wall of the bolt is connected with a clamping block through a thread, four bolts and four clamping blocks are provided, and the four clamping blocks and bolts are provided at the four corners of the welding table.

[0021] Place the workpiece on the upper surface of the welding table, align the four corners of the workpiece with the four corners of the welding table, turn the bolt to drive the clamp block to move downward, so that the clamp block combines with the welding table to clamp and fix the four corners of the workpiece to prevent the workpiece from shifting during welding.

[0022] The present invention has the following beneficial effects:

[0023] 1. Compared with the prior art, the present invention drives the bidirectional screw to rotate by motor 1, and the bidirectional screw drives the slide bar 1 and the slide bar 2 to slide in opposite directions while the slide bar 1 and the slide bar 2 slide, and the connecting rod 1 and the connecting rod 2 rotate angles while the slide bar 1 and the slide bar 2 slide, and further drives the support plate to be lifted and adjusted. During the lifting process of the support plate, the limit sliding is inside the limit slot and on the outer wall of the guide rod, and the guide rod plays a guiding role. Since the connecting rod 1 and the connecting rod 2 are arranged on both sides of the outer wall of the slide bar 1, the slide bar 2 and the support plate, the connecting rod 1 and the connecting rod 2 are used to support the support plate after the lifting and adjustment, thereby improving the supporting effect of the support plate and increasing the constant pressure on the support plate, thereby preventing the support plate from being damaged due to upward movement during welding due to the operation of the welding mechanism, and further improving the welding work efficiency.

[0024] 2. Compared with the prior art, the present invention promotes the lifting and lowering adjustment of the support plate through the adjusting mechanism and the auxiliary mechanism, drives the welding mechanism to be lifted and lowered, makes the lower surface of the welding head contact with the workpiece, drives the welding head to rotate through the second motor, and promotes the welding head to stir friction welding the workpiece.

[0025] 3. Compared with the prior art, the present invention places the workpiece on the upper surface of the welding table so that the four corners of the workpiece are aligned with the four corners of the welding table, presses the clamp on the upper surface of the workpiece, and fixes the clamp and the welding table with bolts to prevent the workpiece from shifting during welding and affecting the welding effect.

[0026] 4. Compared with the prior art, the present invention drives the screw shaft to rotate through three motors, and the rotation of the screw shaft drives the support seat to move horizontally. The electric telescopic rod drives the welding table to slide inside the support seat, so that the welding table can move longitudinally, and then can drive the workpiece to move and adjust in multiple directions to assist in completing the welding work. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the welding mechanism of the present invention;

[0029] Figure 3 It is a schematic diagram of the adjustment mechanism of the present invention;

[0030] Figure 4 It is a schematic diagram of the support base structure of the present invention;

[0031] Figure 5 It is a schematic diagram of the welding table structure of the present invention;

[0032] Figure 6 It is a schematic diagram of the clamping block structure of the present invention;

[0033] Legend:

[0034] 1. Base; 2. Support column; 201. Protective shell; 202. Limiting groove; 203. Guide rod; 3. Adjusting mechanism; 301. Motor 1; 302. Bidirectional screw; 4. Support plate; 5. Auxiliary mechanism; 501. Sliding rod 1; 502. Connecting rod 1; 503. Sliding rod 2; 504. Connecting rod 2; 6. Welding mechanism; 601. Motor 2; 602. Welding head; 7. Motor 3; 8. Screw shaft; 9. Support seat; 10. Electric telescopic rod; 11. Welding table; 12. Limiting rod; 13. Clamp; 14. Bolt. DETAILED DESCRIPTION

[0035] Reference Figure 1-6The present invention provides a friction stir welding device capable of realizing constant pressure control, comprising a base 1, a support column 2 is fixedly connected to the upper surface of the base 1, a protective shell 201 is fixedly connected to the upper surface of the support column 2, a limiting groove 202 is provided inside the support column 2, a guide rod 203 is fixedly connected inside the limiting groove 202, a support plate 4 is slidably connected inside the limiting groove 202, the support plate 4 is limitedly slid inside the limiting groove 202, the support plate 4 is slidably connected to the outer wall of the guide rod 203, the support plate 4 is limitedly slid on the outer wall of the guide rod 203, the guide rod 203 plays a guiding role, a welding mechanism 6 is installed inside the support plate 4, and the welding mechanism 6 is used to weld the workpiece The protective shell 201 is provided with an adjusting mechanism 3 inside, and the adjusting mechanism 3 is used to assist the support plate 4 in lifting and lowering adjustment. The adjusting mechanism 3 includes a motor 301, and the main end of the motor 301 is fixedly connected to the left side of the outer wall of the protective shell 201. The output end of the motor 301 is fixedly connected to a bidirectional screw rod 302, and the motor 301 drives the bidirectional screw rod 302 to rotate. The bidirectional screw rod 302 is rotatably connected to the inside of the protective shell 201, and the bidirectional screw rod 302 is limited to rotate inside the protective shell 201. The protective shell 201 is used to protect the bidirectional screw rod 302. An auxiliary mechanism 5 is installed inside the protective shell 201, and the auxiliary mechanism 5 is used to support the support plate 4. The auxiliary mechanism 5 includes Slide bar 1 501 and slide bar 2 503, a slide groove is provided inside the protective shell 201, slide bar 1 501 and slide bar 2 503 are slidably connected inside the slide groove, slide bar 1 501 and slide bar 2 503 are limitedly slid in the slide groove inside the protective shell 201, slide bar 1 501 is threadedly connected to the outer wall of the bidirectional screw rod 302, slide bar 2 503 is threadedly connected to the outer wall of the bidirectional screw rod 302, the rotation of the bidirectional screw rod 302 drives slide bar 1 501 and slide bar 2 503 to synchronously slide and adjust in both directions, the outer wall of slide bar 1 501 is rotatably connected to connecting rod 1 502, the outer wall of slide bar 2 503 is rotatably connected to connecting rod 2 504, connecting rod 1 502 is rotatably connected to the outer wall of the support plate 4, and connecting rod 2 504 is rotatably connected to the outer wall of the support plate 4. The connecting rod 502 and the connecting rod 504 are movably connected to the outer wall of the support plate 4, and the support plate 4 is supported by the connecting rod 1 502 and the connecting rod 2 504. The sliding rod 1 501 and the sliding rod 2 503 are symmetrically arranged. There are two connecting rods 1 502, and the two connecting rods 1 502 are arranged on both sides of the sliding rod 1 501 and the outer wall of the support plate 4. There are two connecting rods 2 504, and the two connecting rods 2 504 are arranged on both sides of the sliding rod 1 501 and the outer wall of the support plate 4. By arranging the connecting rod 1 502 and the connecting rod 2 504 on both sides of the support plate 4 and connecting the sliding rod 1 501 and the sliding rod 2 503, the supporting force and constant pressure on the support plate 4 are improved, the stability of the support plate 4 after being raised and lowered is ensured, and the support plate 4 is prevented from being damaged due to shaking during welding;

[0036] The welding mechanism 6 includes a motor 2 601 and a welding head 602. The main end of the motor 2 601 is fixedly connected to the upper surface of the support plate 4, and the output end of the motor 2 601 is fixedly connected to the upper end of the welding head 602. The welding head 602 is arranged on the lower surface of the support plate 4. The motor 2 601 drives the welding head 602 to rotate, so as to form a friction effect between the welding head 602 and the workpiece, thereby achieving the effect of stir friction welding on the workpiece. The outer wall of the base 1 is fixedly connected to a motor 3 7, and the motor 3 7 is arranged on the right side of the outer wall of the base 1. The output end of the motor 3 7 is fixedly connected to a screw shaft 8, and the screw shaft 8 is rotatably connected to the inside of the base 1. The screw shaft 8 is limited to rotate inside the base 1, and the motor 3 7 is used to drive the screw shaft 8 to rotate. The outer wall of the screw shaft 8 is threadedly connected to a support seat 9, and the support seat 9 is slidably connected to the inside of the base 1. The rotation of the screw shaft 8 drives the support seat 9 to limit the translation inside the base 1 to achieve lateral translation adjustment. One side of the outer wall of the support seat 9 is fixedly connected to an electric telescopic rod 10, and the electric telescopic rod 10 It is a multi-section telescopic structure. The telescopic end of the electric telescopic rod 10 is fixedly connected to the welding platform 11, and the welding platform 11 is slidably connected to the inside of the support seat 9. The electric telescopic rod 10 is used to drive the welding platform 11 to move longitudinally. The outer wall of the welding platform 11 is fixedly connected to the limit rod 12, and the limit rod 12 is slidably connected to the inside of the support seat 9. There are two limit rods 12, and the two limit rods 12 are arranged on both sides of the outer wall of the electric telescopic rod 10. The welding platform 11 drives the two limit rods 12 to move synchronously during the translation adjustment. The limit rod 12 is limited inside the support seat 9 to prevent the welding platform 11 from excessively sliding away from the support seat 9. The inner thread of the welding platform 11 is connected with a bolt 14, and the outer wall of the bolt 14 is threadedly connected with a clamping block 13. Four bolts 14 and clamping blocks 13 are each provided. Four clamping blocks 13 and bolts 14 are arranged at the four corners of the welding platform 11. The clamping blocks 13 and the welding platform 11 are fixed with bolts 14, so that the workpiece is clamped and fixed on the upper surface of the welding platform 11 to prevent the workpiece from position displacement during the welding process.

[0037] Working principle: the motor 1 301, the motor 2 601, the motor 3 7 and the electric telescopic rod 10 involved in the present invention are all controlled by a remote device; when in use, first place the workpiece on the upper surface of the welding table 11, align the four corners of the workpiece with the four corners of the welding table 11, place four clamping blocks 13 at the four corners of the workpiece respectively, and use bolts 14 to thread the clamping blocks 13 and the four corners of the welding table 11 to fix them, so that the workpiece is limitedly clamped on the upper surface of the welding table 11 to prevent the workpiece from positional displacement during welding and ensure the accuracy of welding; after the workpiece is fixed, start the motor 1 301, using the motor 1 301 to drive the bidirectional screw rod 302 to rotate forward, the bidirectional screw rod 302 drives the slide bar 1 501 to move rightward and drives the slide bar 2 503 to move leftward during the rotation process, and the slide bar 1 501 and the slide bar 2 503 slide synchronously, the slide bar 1 501 drives the connecting rod 1 502 to rotate rightward during the movement of the slide bar 1 501 to the right, and the slide bar 2 503 drives the connecting rod 2 504 to rotate leftward during the movement of the slide bar 2 503 to the left, thereby prompting the support plate 4 to move downward, so that the support plate 4 drives the welding mechanism 6 to move downward, so that the lower surface of the welding head 602 contacts the upper surface of the workpiece, and the auxiliary mechanism 5 is driven by the adjustment mechanism 3. The support plate 4 is adjusted to move downward, and the auxiliary mechanism 5 can support the support plate 4, which effectively improves the supporting force of the support plate 4, and also improves the constant pressure on the support plate 4, preventing the support plate 4 from being damaged due to the upward movement caused by the operation of the welding mechanism 6, thereby improving the welding efficiency. After the welding head 602 contacts the workpiece, the second motor 601 is started to drive the welding head 602 to rotate, and the third motor 7 is started to drive the screw shaft 8 to rotate, so that the support seat 9 is translated horizontally, and the electric telescopic rod 10 is started to drive the welding table 11 to translate longitudinally, thereby driving the multi-directional translation adjustment of the workpiece, and combined with the rotation of the welding head 602, the workpiece is adjusted horizontally. The friction stir welding work is performed on the surface of the parts. After the welding is completed, the motor 301 is started to drive the bidirectional screw rod 302 to rotate in the opposite direction. The bidirectional screw rod 302 rotates in the opposite direction to cause the slide bar 1 501 to slide to the left and the slide bar 2 503 to slide to the right, and the slide bar 1 501 and the slide bar 2 503 slide synchronously. The slide bar 1 501 slides to the left and drives the connecting rod 1 502 to rotate to the left by an angle, and the slide bar 2 503 slides to the right and drives the connecting rod 2 504 to rotate to the right by an angle, so as to cause the support plate 4 to move up, thereby achieving the effect of driving the support plate 4 to move up and adjusting, ensuring the stability of the support plate 4 during the lifting process, and improving the supporting force and constant pressure on the support plate 4.

[0038] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A friction stir welding device capable of achieving constant pressure control, comprising a base (1), characterized in that: The upper surface of the base (1) is fixedly connected to a support column (2), the upper surface of the support column (2) is fixedly connected to a protective shell (201), a limiting groove (202) is provided inside the support column (2), a guide rod (203) is fixedly connected inside the limiting groove (202), a support plate (4) is slidably connected inside the limiting groove (202), the support plate (4) is slidably connected to the outer wall of the guide rod (203), a welding mechanism (6) is installed inside the support plate (4), an adjustment mechanism (3) is installed inside the protective shell (201), the adjustment mechanism (3) comprises a motor 1 (301), a main body end of the motor 1 (301) is fixedly connected to the left side of the outer wall of the protective shell (201), an output end of the motor 1 (301) is fixedly connected to a bidirectional lead screw (302), and the bidirectional lead screw (302) is rotatably connected to the inside of the protective shell (201), and an auxiliary mechanism (5) is installed inside the protective shell (201), and the auxiliary mechanism (5) includes a slide bar 1 (501) and a slide bar 2 (503). A slide groove is opened inside the protective shell (201), and the slide bar 1 (501) and the slide bar 2 (503) are slidably connected inside the slide groove. The slide bar 1 (501) is threadedly connected to the outer wall of the bidirectional screw rod (302), and the slide bar 2 (503) is threadedly connected to the outer wall of the bidirectional screw rod (302). The outer wall of the slide bar 1 (501) is rotatably connected to the connecting rod 1 (502), and the outer wall of the slide bar 2 (503) is rotatably connected to the connecting rod 2 (504). The connecting rod 1 (502) is rotatably connected to the outer wall of the support plate (4), and the connecting rod 2 (504) is rotatably connected to the outer wall of the support plate (4).

2. A friction stir welding device capable of realizing constant pressure control according to claim 1, characterized in that: The sliding rod 1 (501) and the sliding rod 2 (503) are symmetrically arranged, the connecting rod 1 (502) is provided with two, and the two connecting rods 1 (502) are arranged on both sides of the outer wall of the sliding rod 1 (501) and the support plate (4), and the connecting rod 2 (504) is provided with two, and the two connecting rods 2 (504) are arranged on both sides of the outer wall of the sliding rod 1 (501) and the support plate (4).

3. The friction stir welding device capable of realizing constant pressure control according to claim 1, characterized in that: The welding mechanism (6) comprises a second motor (601) and a welding head (602); the main end of the second motor (601) is fixedly connected to the upper surface of the support plate (4); the output end of the second motor (601) is fixedly connected to the upper end of the welding head (602); and the welding head (602) is arranged on the lower surface of the support plate (4).

4. The friction stir welding device capable of realizing constant pressure control according to claim 1, characterized in that: The outer wall of the base (1) is fixedly connected to a motor three (7), and the motor three (7) is arranged on the right side of the outer wall of the base (1). The output end of the motor three (7) is fixedly connected to a screw shaft (8), and the screw shaft (8) is rotatably connected to the inside of the base (1).

5. A friction stir welding device capable of realizing constant pressure control according to claim 4, characterized in that: The outer wall of the screw shaft (8) is threadedly connected to a support seat (9), and the support seat (9) is slidably connected to the interior of the base (1).

6. A friction stir welding device capable of realizing constant pressure control according to claim 5, characterized in that: An electric telescopic rod (10) is fixedly connected to one side of the outer wall of the support seat (9), and a welding platform (11) is fixedly connected to the telescopic end of the electric telescopic rod (10), and the welding platform (11) is slidably connected to the interior of the support seat (9).

7. A friction stir welding device capable of realizing constant pressure control according to claim 6, characterized in that: The outer wall of the welding platform (11) is fixedly connected to a limit rod (12), and the limit rod (12) is slidably connected to the inside of the support seat (9). Two limit rods (12) are provided, and the two limit rods (12) are arranged on both sides of the outer wall of the electric telescopic rod (10).

8. The friction stir welding device capable of realizing constant pressure control according to claim 7, characterized in that: The internal thread of the welding platform (11) is connected to a bolt (14), and the outer wall of the bolt (14) is threadedly connected to a clamping block (13). Four of the bolts (14) and four of the clamping blocks (13) are provided, and the four clamping blocks (13) and bolts (14) are provided at the four corners of the welding platform (11).

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