Table type friction stir spot welding equipment with safety protection structure

Abstract

The invention relates to the technical field of table type friction stir spot welding equipment, and discloses table type friction stir spot welding equipment with a safety protection structure. An annular table is coaxially fixed to the bottom of the annular box, and a first scraper knife is arranged at the bottom of the annular table; when the stirring needle descends to make contact with the top face of the metal plate, the first scraper knife can rotate with the center shaft of the stirring needle as the axis, and therefore flashes and burrs generated at the weld joint starting point can be removed in a surrounding mode. When the stirring head assembly translates along the guide rail, the first scraper knife translates synchronously along with the stirring head assembly, and performs translation type removal along the welding seam in the welding process, so that flash and burrs generated on the periphery of the welding seam can be removed in time while friction stir spot welding is performed, and independent polishing treatment after welding is not needed; and in addition, flash and burrs can be adaptively removed according to the welding process and the welding seam forming stage, and the welding seam and the surface of the metal plate are protected to the maximum extent.

Description

Technical Field

[0001] This invention relates to the field of benchtop friction stir welding equipment, and more specifically to a benchtop friction stir welding equipment with a safety protection structure. Background Technology

[0002] Friction stir spot welding (FSW) is a novel solid-state spot welding technology evolved from friction stir welding (FSW). This technology has proven highly suitable for welding copper alloys, aluminum alloys, and dissimilar materials. FSW involves a high-speed rotating tool penetrating the workpieces to be joined. The intense friction from the tool heats and softens the material in the welding area, and the mechanical stirring action of the tool achieves plastic flow and mixing of the material, ultimately forming a solid weld joint. During the process, the shoulder of the stirring head applies axial pressure directly to the weld joint, which easily generates debris, affecting the surface quality of the product.

[0003] Currently, there are some existing technologies that can keep metal debris away from the welding position. For example, patent publication number CN114951959B mainly uses the following technique: when debris moves out from the side of the stirring pin, it is moved away from the stirring pin by the action of the first and second inclined surfaces. Under the action of the baffle cone, the debris moves along the first and second inclined surfaces, making it less likely to enter the space between the baffle cone and the shoulder. After analysis, the drawback of this technical solution is that welding burrs or other defects are easily generated at the weld. However, existing technologies cannot remove the burrs or other defects around the weld at the same time as welding. They can only be treated after welding is completed. At this time, grinding is required after cooling, which consumes a lot of manpower and resources, is cumbersome, and increases the investment cost of the friction stir spot welding process. Based on this, the present invention provides a tabletop friction stir spot welding device with a safety protection structure that can remove the burrs and other defects generated at the weld while performing friction stir spot welding with the stirring head. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a tabletop friction stir spot welding device with a safety protection structure, thereby solving the technical problem that it is impossible to remove burrs or flash around the weld during welding, which would require subsequent grinding of burrs or flash.

[0005] The objective of this invention can be achieved through the following technical solutions: A benchtop friction stir spot welding device with a safety protection structure includes: A platform is provided on which a support plate for placing a metal plate is provided. The platform is also provided with a drive source for driving the stirring head assembly. The stirring head assembly moves along a guide rail fixed on the platform. The output end of the stirring head assembly is a stirring needle. The stirring needle has a shoulder on its outer side. An annular box is rotatably mounted on a mounting bracket, with a stirring needle passing through the central through-hole of the annular box. The mounting bracket is fixedly connected to the lifting end of the stirring head assembly. An annular platform is coaxially fixed to the bottom of the annular box, with the stirring needle passing through the central through-hole of the annular platform. A first scraper is provided at the bottom of the annular platform; when the first scraper is in its initial position, it is located on the side of the shoulder. The transmission assembly is mounted on the mounting bracket; when the stirring needle descends to the lowest point of its movement path, the first shovel abuts against the top surface of the metal plate, and the transmission assembly drives the first shovel to rotate about the central axis of the stirring needle; when the stirring head assembly moves along the guide rail, the first shovel rotates to the initial position and stops rotating, and the first shovel moves synchronously with the stirring head assembly.

[0006] As a further aspect of the present invention: the transmission assembly includes: The measuring rod has its top connected to the slider via a first elastic element. The slider is slidably installed inside a limiting frame. The limiting frame is fixed to an annular platform, and the slider is connected to the side wall of the limiting frame via a second elastic element. A first push plate, fixed to a measuring rod, is mounted on the annular platform with a limit switch, the position of which interferes with the movement path of the first push plate; and The driving gear is rotatably mounted on a mounting bracket, and the mounting bracket is provided with an output source for driving the driving gear to rotate. The output source is connected to a limit switch and an encoder. The ring platform is coaxially fixedly connected to the driven gear, and the driven gear meshes with the driving gear. When the stirring needle descends to contact the top surface of the metal plate, the bottom of the measuring rod also contacts the top surface of the metal plate. The stirring needle then continues to descend and inserts into the seam of the metal plate, causing the first elastic element to deform until the stirring needle reaches the lowest point of its movement path. At this point, the first push plate triggers the limit switch, and the output source is activated. When the stirring head assembly moves along the guide rail, the bottom of the measuring rod first remains relatively stationary with the top surface of the metal plate, causing the slider to slide within the limit frame to the other end of its movement path. At this point, the second elastic element deforms, and the slider simultaneously causes the first push plate to slide away from the limit switch, thus turning off the output source.

[0007] As a further aspect of the present invention: the bottom of the measuring rod is provided with a friction element that contacts the top surface of the metal plate.

[0008] As a further aspect of the present invention: a second shovel is also provided at the bottom of the annular platform, and the top of the second shovel is connected to the bottom surface of the annular platform through a fourth elastic element; when the first shovel is in its initial position, the first shovel and the second shovel are symmetrically arranged, and the stirring needle is located between the two.

[0009] As a further aspect of the present invention: the transmission assembly further includes a second push plate fixed to the measuring rod, and a lifting block located above the second push plate is fixed on the second shovel, and the lifting block is connected to the bottom surface of the annular platform through a third elastic element; when the stirring needle descends to contact the top surface of the metal plate, the top surface of the second push plate is in contact with the bottom surface of the lifting block, and then the stirring needle continues to descend and inserts into the seam of the metal plate, then the second push plate blocks the descent of the lifting block, thereby reducing the distance between the second shovel and the bottom surface of the annular platform, and the fourth elastic element contracts; when the slider slides to the other end of its movement path within the limiting frame, the measuring rod drives the second push plate to slide away from the lifting block, and the second shovel resets.

[0010] As a further aspect of the present invention: air holes are provided at the connection points between the first and second shovels and the annular platform, and a fan is provided inside the annular platform.

[0011] As a further aspect of the present invention: cooling components are respectively provided on the first shovel and the second shovel, and the cooling components are connected to the annular platform.

[0012] As a further aspect of the present invention: the lifting end of the stirring head assembly is connected to both protective plates, and when the stirring head assembly moves along the guide rail, the weld passes through the gap between the two protective plates.

[0013] The beneficial effects of this invention are: (1) In this invention, the stirring head assembly is driven to descend by the driving source. When the stirring needle descends to contact the top surface of the metal plate, the annular platform rotates. The first scraper at the bottom can rotate around the central axis of the stirring needle, thereby removing the burrs and flash generated at the start of the weld. When the stirring head assembly moves along the guide rail, the first scraper stops at the initial position after rotating a full circle. The first scraper moves synchronously with the stirring head assembly, so that it can remove the burrs and flash generated around the weld during the welding process. It can remove the burrs and flash generated around the weld in time while stirring friction spot welding, without the need for separate grinding after welding. It can also remove the burrs and flash according to the weld formation stage according to the welding process, so as to protect the weld and the surface of the metal plate to the maximum extent. (2) In this invention, when the stirring needle is inserted into the metal plate joint, the second shovel is raised relative to the first shovel. Only the first shovel can rotate on the surface of the metal plate to remove burrs and flash, which avoids the problem that the two shovels rotating in the same direction cannot effectively collect burrs and flash. When the stirring head assembly moves along the guide rail, the first shovel and the second shovel move synchronously with the stirring head assembly, which can remove the burrs and flash around the linear weld generated during the welding process by translation. (3) In this invention, the cooling components can be used to cool down the first and second shovels, thereby accelerating the cooling of the burrs and flash on their surfaces. This makes it easier for the fan to draw airflow and carry impurities into the annular platform, thereby improving the efficiency of collection after removal. Attached Figure Description

[0014] The invention will now be further described with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the annular box structure in this invention; Figure 3 This is a schematic diagram of the ring-shaped truncated cone structure in this invention; Figure 4 This is a schematic diagram of the structure of the first shovel in this invention; Figure 5 This is a schematic diagram of the transmission component in this invention; Figure 6 This is a schematic diagram of the drive gear in this invention; Figure 7 This is a schematic diagram of the structure of the second blade in the raised state in this invention; Figure 8 This is a schematic diagram of the second push plate sliding away from the lifting block in this invention.

[0016] In the diagram: 1. Base; 2. Support plate; 3. Drive source; 4. Guide rail; 5. Stirring head assembly; 6. Annular box; 7. Mounting bracket; 8. Annular platform; 9. First shovel; 10. Transmission assembly; 1001. Measuring rod; 1002. First elastic element; 1003. First push plate; 1004. Limit switch; 1005. Drive gear; 1006. Driven gear; 1007. Slider; 1008. Second elastic element; 1009. Limit frame; 1010. Friction element; 1011. Second push plate; 1012. Lifting block; 1013. Third elastic element; 11. Second shovel; 12. Fourth elastic element; 13. Cooling assembly; 14. Fifth elastic element; 15. Air hole; 16. Protective plate. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1-4 As shown, the present invention is a benchtop friction stir spot welding device with a safety protection structure, comprising: A platform 1 is provided with a support plate 2 for placing a metal plate. The platform 1 is also provided with a drive source 3 for driving the stirring head assembly 5. The stirring head assembly 5 moves along a guide rail 4 fixed on the platform 1. The output end of the stirring head assembly 5 is a stirring needle, and a shoulder is provided on the outside of the stirring needle. An annular box 6 is rotatably mounted on a mounting bracket 7, with a stirring needle passing through the central through hole of the annular box 6. The mounting bracket 7 is fixedly connected to the lifting end of the stirring head assembly 5. An annular platform 8 is coaxially fixed to the bottom of the annular box 6, with the stirring needle passing through the central through hole of the annular platform 8. A first scraper 9 is provided at the bottom of the annular platform 8; when the first scraper 9 is in its initial position, it is located on the side of the shoulder. The transmission assembly 10 is mounted on the mounting bracket 7. When the stirring needle descends to the lowest point of its movement path, the first shovel 9 abuts against the top surface of the metal plate, and the transmission assembly 10 drives the first shovel 9 to rotate around the central axis of the stirring needle. When the stirring head assembly 5 moves along the guide rail 4, the first shovel 9 rotates to the initial position and stops rotating, and the first shovel 9 moves synchronously with the stirring head assembly 5.

[0019] In one embodiment, the drive source 3 includes a linear motion mechanism for driving the lifting end of the stirring head assembly 5 to move up and down, and a linear motion mechanism for driving the stirring head assembly 5 to translate along the guide rail 4. Specifically, the linear motion mechanism can be a hydraulic cylinder, a pneumatic cylinder, or other components. The drive source 3 also includes a motor assembly for driving the stirring needle to rotate. The mounting end of the stirring head assembly 5 is slidably mounted on the guide rail 4, and a lifting end is provided at its bottom, with a stirring needle provided at the bottom of the lifting end. Both the drive source 3 and the stirring head assembly 5 are prior art, and this application does not improve them. Therefore, it is not necessary to disclose their specific mechanical and circuit structures, and this does not affect the completeness of this application.

[0020] The first shovel 9 includes a vertical section and an inclined section, such as... Figure 4As shown, the bottom of the inclined section of the first scraper 9 contacts the surface of the metal plate and is flush with the stirring needle. When the first scraper 9 rotates about the central axis of the stirring needle, the flash and burrs generated at the weld are scraped off by the first scraper 9 and will climb on the inclined section of the first scraper 9 due to the relative motion.

[0021] It should be noted that the overall performance of the stirring pin is relatively poor under high rotation speed, long dwell time, and low penetration depth, while it is relatively good under moderate penetration depth, rotation speed, and dwell time. Therefore, for welding pure copper, if the tensile properties, conductivity, and energy consumption of the stirring pin need to be considered comprehensively, moderate penetration depth, rotation speed, and dwell time should be selected when choosing process parameters. Process parameters that are too small or too large are not conducive to improving the overall performance of the stirring pin. In actual use, the best overall performance is achieved with a penetration depth of 1.2 mm, a rotation speed of 1000 rpm, and a dwell time of 2 s, followed by a process scheme with a penetration depth of 1.2 mm, a rotation speed of 1200 rpm, and a dwell time of 4 s. The flash and burrs generated during the dwell time of the stirring pin can be removed in time by the rotating first scraper 9.

[0022] In practical application, after placing the metal plate to be welded on the support plate 2, the stirring head assembly 5 is driven to descend by the drive source 3. When the stirring needle inserts into the joint of the metal plate, it stops descending when it reaches the lowest point of its movement path. At this time, the first scraper 9 abuts against the top surface of the metal plate, and the transmission assembly 10 drives the first scraper 9 to rotate around the central axis of the stirring needle. Simultaneously, the stirring needle rotates at high speed, and the material in the welding area is heated and softened under the intense friction of the stirring needle. The material undergoes plastic flow and mixing through the mechanical stirring action of the stirring needle, ultimately forming a solid welded joint. In the process, the first scraper 9 rotates to remove the burrs and flash generated at the start of the weld in a circular motion. Then, when the stirring head assembly 5 of the drive source 3 moves along the guide rail 4, the first scraper 9 rotates to the initial position and stops rotating. The first scraper 9 moves synchronously with the stirring head assembly 5, so that it can remove the burrs and flash generated around the weld in a linear motion during the welding process. It can remove the burrs and flash generated around the weld in a timely manner while performing friction stir spot welding, without the need for separate grinding after welding. Furthermore, it can adaptively remove the burrs and flash according to the weld formation stage of the welding process, thus protecting the weld and the surface of the metal plate to the greatest extent.

[0023] like Figures 1-8 As shown, in a preferred embodiment of the present invention, the transmission assembly 10 includes: The measuring rod 1001 has its top connected to the slider 1007 via a first elastic element 1002. The slider 1007 is slidably installed in the limiting frame 1009, which is fixed on the annular platform 8. The slider 1007 is connected to the side wall of the limiting frame 1009 via a second elastic element 1008. A first push plate 1003 is fixed to a measuring rod 1001. A limit switch 1004 is installed on the annular platform 8, and the position of the limit switch 1004 interferes with the movement path of the first push plate 1003. The driving gear 1005 is rotatably mounted on the mounting bracket 7, and the mounting bracket 7 is provided with an output source for driving the driving gear 1005 to rotate. The output source is connected to the limit switch 1004 and the encoder. The ring platform 8 is coaxially fixedly connected to the driven gear 1006, and the driven gear 1006 meshes with the driving gear 1005. When the stirring needle descends to contact the top surface of the metal plate, the bottom of the measuring rod 1001 contacts the top surface of the metal plate. Then the stirring needle continues to descend and inserts into the seam of the metal plate. The first elastic element 1002 deforms until the stirring needle descends to the lowest point of its movement path. At this time, the first push plate 1003 triggers the limit switch 1004, and the output source is started. When the stirring head assembly 5 moves along the guide rail 4, the bottom of the measuring rod 1001 first remains relatively stationary with the top surface of the metal plate, driving the slider 1007 to slide within the limit frame 1009 to the other end of its movement path. At this time, the second elastic element 1008 deforms, and the slider 1007 drives the first push plate 1003 to slide away from the limit switch 1004, and the output source is turned off.

[0024] In one embodiment, both the first elastic element 1002 and the second elastic element 1008 can be springs, or other elastic components such as silicone pillars or spring sheets can be used instead. No specific limitations are made in this embodiment. The output source can be a motor assembly, a gear assembly driven by a motor, or a pulley assembly, as long as it can cause the drive gear 1005 to rotate. No specific limitations are made in this embodiment. The encoder is connected to the output source and can cooperate to control the number of full revolutions of the drive gear 1005 each time. The encoder is connected to the controller. The controller, encoder, and output source are all existing technologies, and this application does not improve them. Therefore, it is not necessary to disclose their specific mechanical and circuit structures, and this does not affect the completeness of this application.

[0025] In practical application, when the stirring needle descends to contact the top surface of the metal plate, the bottom of the measuring rod 1001 contacts the top surface of the metal plate. As the stirring needle continues to descend and inserts into the seam of the metal plate, the first elastic element 1002 deforms until the stirring needle reaches the lowest point of its movement path. At this point, the first push plate 1003 triggers the limit switch 1004, activating the output source. The output source drives the drive gear 1005 to rotate, which in turn drives the driven gear 1006 to rotate, causing the annular platform 8 to rotate. The first scraper 9 at its bottom can then rotate around the central axis of the stirring needle, thereby controlling the movement of the stirring needle. During the process, burrs and rough edges around the weld are removed. When the stirring head assembly 5 moves along the guide rail 4, the bottom of the measuring rod 1001 first remains relatively stationary with the top surface of the metal plate, causing the slider 1007 to slide within the limit frame 1009 to the other end of its movement path. At this time, the second elastic element 1008 deforms, and the slider 1007 causes the first push plate 1003 to slide away from the limit switch 1004, thus turning off the output source. This causes the first scraper 9 to stop at the initial position after rotating a full number of revolutions. The specific number of revolutions and rotation speed can be set according to production needs during actual use, and will not be elaborated here.

[0026] like Figure 7 As shown, in a preferred embodiment of the present invention, the bottom of the measuring rod 1001 is provided with a friction element 1010 that contacts the top surface of the metal plate.

[0027] In one embodiment, the friction element 1010 may be selected from several rubber protrusions, or it may be selected from anti-slip textures and other components, as long as they can increase the friction between the bottom of the measuring rod 1001 and the top surface of the metal plate. This embodiment does not make specific limitations here.

[0028] like Figures 1-8 As shown, in a preferred embodiment of the present invention, the bottom of the annular platform 8 is further provided with a second shovel 11, and the top of the second shovel 11 is connected to the bottom surface of the annular platform 8 through a fourth elastic member 12; when the first shovel 9 is in its initial position, the first shovel 9 and the second shovel 11 are symmetrically arranged, and the stirring needle is located between the two.

[0029] In one embodiment, the transmission assembly 10 further includes a second push plate 1011 fixed to the measuring rod 1001. A lifting block 1012 located above the second push plate 1011 is fixed on the second shovel 11, and the lifting block 1012 is connected to the bottom surface of the annular platform 8 through a third elastic member 1013. When the stirring needle descends to contact the top surface of the metal plate, the top surface of the second push plate 1011 is in contact with the bottom surface of the lifting block 1012. Subsequently, the stirring needle continues to descend and inserts into the seam of the metal plate. The second push plate 1011 then blocks the descent of the lifting block 1012, thereby reducing the distance between the second shovel 11 and the bottom surface of the annular platform 8, and the fourth elastic member 12 contracts. When the slider 1007 slides to the other end of its movement path within the limiting frame 1009, the measuring rod 1001 drives the second push plate 1011 to slide away from the lifting block 1012, and the second shovel 11 resets.

[0030] The second shovel 11 and the first shovel 9 have the same structure, and their inclined sections are arranged in parallel. The third elastic element 1013 and the fourth elastic element 12 can both be springs, or other elastic components such as silicone pillars or spring sheets can be used instead. No specific limitation is made in this embodiment.

[0031] In practical application, when the stirring needle descends to contact the top surface of the metal plate, the top surface of the second push plate 1011 is in contact with the bottom surface of the lifting block 1012. Subsequently, as the stirring needle continues to descend and inserts into the seam of the metal plate, the second push plate 1011 blocks the descent of the lifting block 1012, reducing the distance between the second shovel 11 and the bottom surface of the annular platform 8, and causing the fourth elastic element 12 to contract. This process enables the second shovel 11 to be raised relative to the first shovel 9 when the stirring needle inserts into the seam of the metal plate. When the stirring needle descends to the lowest point of its movement path, the first shovel 9 contacts the surface of the metal plate, while the second shovel 11 is above the surface of the metal plate, with no contact between them. Therefore, when the annular platform 8 rotates, only the second shovel 9... The first scraper 9 can rotate on the surface of the metal plate to remove burrs and flash, avoiding the problem that two scrapers rotating in the same direction cannot effectively collect burrs and flash. When the stirring head assembly 5 moves along the guide rail 4, the bottom of the measuring rod 1001 first keeps relatively stationary with the top surface of the metal plate. When the slider 1007 moves to the other end of its movement path within the limit frame 1009, the measuring rod 1001 drives the second push plate 1011 to slide away from the lifting block 1012. Then the second scraper 11 resets and contacts the surface of the metal plate. Subsequently, the first scraper 9 and the second scraper 11 move synchronously with the stirring head assembly 5, which can remove burrs and flash around the linear weld generated during the welding process.

[0032] like Figures 4-8As shown, in a preferred embodiment of the present invention, air holes 15 are respectively provided at the connection between the first shovel 9 and the second shovel 11 and the annular platform 8, and a fan is provided inside the annular platform 8.

[0033] In one embodiment, the fan is existing technology and this application has not improved it. Therefore, it is not necessary to disclose its specific mechanical structure and circuit structure, and this does not affect the integrity of this application.

[0034] In practical application, the blower draws in the gas around the weld, and the airflow drives the removed burrs and flash to move upwards along the first scraper 9 and the second scraper 11, and enters the annular platform 8 through the air hole 15 to be collected.

[0035] like Figures 4-8 As shown, in a preferred embodiment of the present invention, the first shovel 9 and the second shovel 11 are respectively provided with cooling components 13, and the cooling components 13 are connected to the annular platform 8.

[0036] In one embodiment, the cooling assembly 13 can be a coolant pipe connected to an external coolant tank located within the annular platform 8, or it can be other structural components with cooling functions, which will not be elaborated here. When the cooling assembly 13 is a coolant pipe connected to an external coolant tank located within the annular platform 8, the mounting end of the cooling assembly 13 is connected to the annular platform 8 via a fifth elastic member 14. The fifth elastic member 14 is a corrugated pipe connected to the coolant pipe to avoid affecting the pipe connection when the second blade 11 is raised or lowered.

[0037] In practical application, the cooling component 13 in this embodiment can cool down the first shovel 9 and the second shovel 11 to accelerate the cooling of the burrs and flash on their surfaces, thereby facilitating the fan to draw airflow and carry impurities into the annular platform 8, thus improving the efficiency of collection after removal.

[0038] like Figures 1-4 As shown, in a preferred embodiment of the present invention, the lifting end of the stirring head assembly 5 is connected to both protective plates 16. When the stirring head assembly 5 moves along the guide rail 4, the weld passes through the gap between the two protective plates 16.

[0039] In one embodiment, the protective plate 16 is arc-shaped, and the centers of the two protective plates 16 coincide with the central axis of the stirring needle. The two protective plates 16 are symmetrically arranged, and both have a gap with the stirring needle.

[0040] In practical application, during the welding process, when the stirring head assembly 5 moves along the guide rail 4 to perform welding, the protective plate 16 can push and collect the metal debris around the weld, and can avoid the safety hazards caused by the scraped burrs and flash flying everywhere.

[0041] Working principle of the invention: The above embodiments of the invention provide a benchtop friction stir spot welding device with a safety protection structure. After the metal plate to be welded is placed on the support plate 2, the stirring head assembly 5 is driven to descend by the drive source 3. When the stirring needle is inserted into the joint of the metal plate, the stirring needle stops descending when it reaches the lowest point of its movement path. At this time, the first scraper 9 abuts against the top surface of the metal plate, and the transmission assembly 10 drives the first scraper 9 to rotate around the central axis of the stirring needle. At the same time, the stirring needle rotates at high speed, and the material in the welding area is heated and softened under the intense friction of the stirring needle. The plastic flow and mixing of the material are achieved through the mechanical stirring action of the stirring needle. The process involves the first scraper 9 rotating to remove burrs and flash generated at the weld start point. Subsequently, as the stirring head assembly 5 of the drive source 3 moves along the guide rail 4, the first scraper 9 rotates to its initial position and stops rotating. The first scraper 9 moves synchronously with the stirring head assembly 5, allowing for translational removal along the weld during the welding process. This enables timely removal of burrs and flash generated around the weld while simultaneously performing friction stir spot welding, eliminating the need for post-weld grinding. Furthermore, the scraper can adaptively remove burrs and flash according to the weld formation stage, maximizing the protection of the weld and the metal plate surface.

[0042] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A benchtop friction stir spot welding device with a safety protection structure, characterized in that, include: A platform (1) is provided with a support plate (2) for placing a metal plate. The platform (1) is also provided with a drive source (3) for driving the stirring head assembly (5). The stirring head assembly (5) moves along the guide rail (4) fixed on the platform (1). The output end of the stirring head assembly (5) is a stirring needle. The stirring needle has a shoulder on its outer side. An annular box (6) is rotatably mounted on a mounting bracket (7), with a stirring needle penetrating the central through hole of the annular box (6). The mounting bracket (7) is fixedly connected to the lifting end of the stirring head assembly (5). An annular platform (8) is coaxially fixed at the bottom of the annular box (6), with the stirring needle penetrating the central through hole of the annular platform (8). A first scraper (9) is provided at the bottom of the annular platform (8). When the first scraper (9) is in its initial position, it is located on the side of the shoulder. The transmission assembly (10) is mounted on the mounting bracket (7). When the stirring needle descends to the lowest point of its movement path, the first shovel (9) abuts against the top surface of the metal plate, and the transmission assembly (10) drives the first shovel (9) to rotate around the central axis of the stirring needle. When the stirring head assembly (5) moves along the guide rail (4), the first shovel (9) rotates to the initial position and stops rotating, and the first shovel (9) moves synchronously with the stirring head assembly (5).

2. The tabletop friction stir spot welding equipment with a safety protection structure according to claim 1, characterized in that, The transmission assembly (10) includes: The measuring rod (1001) is connected to the slider (1007) at its top via a first elastic element (1002). The slider (1007) is slidably installed in the limiting frame (1009). The limiting frame (1009) is fixed on the annular platform (8), and the slider (1007) is connected to the side wall of the limiting frame (1009) via a second elastic element (1008). The first push plate (1003) is fixed to the measuring rod (1001), and a limit switch (1004) is installed on the annular platform (8), the position of the limit switch (1004) interfering with the movement path of the first push plate (1003); and The driving gear (1005) is rotatably mounted on the mounting bracket (7), and the mounting bracket (7) is provided with an output source for driving the driving gear (1005) to rotate. The output source is connected to the limit switch (1004) and the output source is connected to the encoder. The ring platform (8) is coaxially fixedly connected to the driven gear (1006), and the driven gear (1006) meshes with the driving gear (1005). When the stirring needle descends to contact the top surface of the metal plate, the bottom of the measuring rod (1001) contacts the top surface of the metal plate. Then the stirring needle continues to descend and inserts into the seam of the metal plate. The first elastic element (1002) deforms until the stirring needle descends to the lowest point of its movement path. At this time, the first push plate (1003) triggers the limit switch (1004), and the output source is started. When the stirring head assembly (5) moves along the guide rail (4), the bottom of the measuring rod (1001) first remains relatively stationary with the top surface of the metal plate, driving the slider (1007) to slide to the other end of its movement path within the limit frame (1009). At this time, the second elastic element (1008) deforms, and the slider (1007) drives the first push plate (1003) to slide away from the limit switch (1004), and the output source is turned off.

3. A benchtop friction stir spot welding device with a safety protection structure according to claim 2, characterized in that, The bottom of the measuring rod (1001) is provided with a friction element (1010) that contacts the top surface of the metal plate.

4. A benchtop friction stir spot welding device with a safety protection structure according to claim 2, characterized in that, The bottom of the annular platform (8) is also provided with a second shovel (11), and the top of the second shovel (11) is connected to the bottom surface of the annular platform (8) through a fourth elastic element (12); when the first shovel (9) is in its initial position, the first shovel (9) and the second shovel (11) are symmetrically arranged, and the stirring needle is located between the two.

5. A benchtop friction stir spot welding device with a safety protection structure according to claim 4, characterized in that, The transmission assembly (10) further includes a second push plate (1011) fixed to the measuring rod (1001), and a lifting block (1012) fixed above the second push plate (1011) on the second shovel (11), and the lifting block (1012) is connected to the bottom surface of the annular platform (8) through a third elastic element (1013); when the stirring needle descends to contact the top surface of the metal plate, the top surface of the second push plate (1011) is in contact with the bottom surface of the lifting block (1012), and then... As the stirring needle continues to descend and inserts into the seam of the metal plate, the second push plate (1011) blocks the descent of the lifting block (1012), causing the gap between the second shovel (11) and the bottom surface of the annular platform (8) to shrink, and the fourth elastic element (12) to contract; when the slider (1007) slides to the other end of its movement path within the limit frame (1009), the measuring rod (1001) drives the second push plate (1011) to slide away from the lifting block (1012), and the second shovel (11) resets.

6. A benchtop friction stir spot welding device with a safety protection structure according to claim 4, characterized in that, Air holes (15) are provided at the connection points between the first shovel (9) and the second shovel (11) and the annular platform (8), and a fan is provided inside the annular platform (8).

7. A benchtop friction stir spot welding device with a safety protection structure according to claim 6, characterized in that, The first shovel (9) and the second shovel (11) are respectively provided with cooling components (13), and the cooling components (13) are connected to the annular platform (8).

8. A benchtop friction stir spot welding device with a safety protection structure according to claim 1, characterized in that, The lifting end of the stirring head assembly (5) is connected to both protective plates (16). When the stirring head assembly (5) moves along the guide rail (4), the weld passes through the gap between the two protective plates (16).

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