Axial force detection device for friction stir welding

Abstract

The present invention provides an axial force detection device for friction stir welding, wherein the lifting component of the device is arranged between the top seat and the base, and is connected to the top seat; the detection component is arranged outside the lifting component, and is connected to the lifting component; the rotating component is arranged below the lifting component, and is connected to the lifting component, and the rotating component is electrically connected to the detection component; the stirring head is arranged below the rotating component, and is connected to the rotating component, so that the stirring head can be lifted and lowered between the welding position and the standby position, and the stirring head is rotated by the rotating component, and the stirring head is electrically connected to the detection component through the rotating component; the transmission component is arranged between the base and the stirring head, and is connected to the base; the receiving platform is arranged on the base, and is connected to the transmission component, so that the welding workpiece and the stirring head are friction welded. In the axial force detection device of the present invention, the stirring head only rotates during the friction stir welding process, and the stirring head bears the pressure in its own axial direction, so that the axial force detection of the stirring head changing in each stage can be more accurate.

Description

Technical Field

[0001] The invention relates to the technical field of axial force detection devices, and in particular to an axial force detection device for friction stir welding. Background Art

[0002] Friction stir welding refers to the use of heat generated by the friction between the high-speed rotating welding tool and the workpiece to partially melt the welded material. When the welding tool moves forward along the welding interface, the plasticized material flows from the front to the back of the welding tool under the action of the rotating friction of the welding tool, and forms a dense solid phase weld under the extrusion of the welding tool. In the process of completing a weld seam by friction stir welding, the pressure on the axial direction of the stirring head has multiple stage changes. The stage changes in the axial pressure of the stirring head have a great influence on the quality of welding. Therefore, it is necessary to accurately detect the axial force on the stirring head.

[0003] In the prior art, when the axial force detection device is detecting the axial pressure of stir friction welding, the stirring head often needs to both rotate to achieve stir friction welding and move along the weld of the workpiece, causing the stirring head itself to bear pressure in multiple directions. It is impossible to accurately detect the axial force changes of the stirring head at each stage, which is not conducive to ensuring the quality of stir friction welding.

[0004] Therefore, the above-mentioned technical problems need to be further resolved. Summary of the invention

[0005] The present invention provides an axial force detection device for friction stir welding. During the friction stir welding process, the stirring head only rotates along its own axial direction, and the receiving platform for loading the welding workpiece moves along the weld seam of the workpiece. The stirring head only rotates in its own axial direction, and the stirring head only bears the pressure in its own axial direction, so that the axial force detection device can accurately detect the changes in the axial force of the stirring head at various stages, which is beneficial to ensuring the welding quality of the friction stir welding.

[0006] To solve the above technical problems, the embodiments of the present invention provide the following technical solutions:

[0007] The invention provides an axial force detection device for stir friction welding, comprising: a frame assembly, comprising a top seat, a vertical frame and a base, the top seat is connected to the base through the vertical frame; a lifting assembly, arranged between the top seat and the base and connected to the top seat, the lifting assembly performs lifting movement between the top seat and the base; a detection assembly, arranged on the outside of the lifting assembly and connected to the lifting assembly; a rotating assembly, arranged below the lifting assembly and connected to the lifting assembly, so that the rotating assembly is lifted and lowered between the top seat and the base through the lifting assembly, and the rotating assembly is electrically connected to the detection assembly; a stirring head, arranged below the rotating assembly and connected to the rotating assembly, so that the stirring head is lifted and lowered between a welding position and a standby position, and the stirring head is rotated through the rotating assembly, and the stirring head is electrically connected to the detection assembly through the rotating assembly; a transmission assembly, arranged between the base and the stirring head, and connected to the base to move along the length direction of the base; a receiving platform, arranged above the base and connected to the transmission assembly, so that a welding workpiece in the receiving platform is friction welded with the stirring head in the welding position.

[0008] Optionally, the transmission assembly includes: a first transmission assembly, which is arranged inside the base, and includes: a first screw rod, both ends of which are connected to the base; a first nut seat, which is connected to the first screw rod, and when the first screw rod rotates, the first nut seat moves relative to the base;

[0009] The second transmission assembly is arranged inside the receiving platform, and includes: a containing cavity; a second screw rod is arranged inside the containing cavity and connected to the outer wall of the receiving platform; a second nut seat is symmetrically arranged at both ends of the second screw rod; a folding rod is passed through the side wall of the receiving platform, and the first end of the folding rod is connected to the second nut seat; a clamping block is arranged above the receiving platform and connected to the second end of the folding rod; a worm wheel is arranged inside the containing cavity and connected to the second screw rod; a worm wheel is arranged below the worm wheel and meshed with the worm wheel; a hand wheel is arranged on the outer wall of the receiving platform and connected to the worm wheel.

[0010] Optionally, the second screw includes a first rod portion and a second rod portion, the first rod portion and the second rod portion are connected, and a worm gear is sleeved on the connecting portion between the first rod portion and the second rod portion, and the thread rotation direction of the first rod portion is opposite to the thread rotation direction of the second rod portion.

[0011] Optionally, the lifting assembly includes: an electric push rod, which is arranged below the top seat and connected to the top seat; a lifting seat, which is arranged below the electric push rod and connected to the electric push rod, so that the lifting seat can be lifted and lowered between the top seat and the base through the electric push rod.

[0012] Optionally, the lifting assembly also includes: a guide rod, which is arranged on the side wall of the stand and is arranged on the side close to the lifting seat in a direction perpendicular to the base; a sliding sleeve, which is arranged on the side wall of the lifting seat and is sleeved on the guide rod, so that the lifting seat can be lifted and lowered along the guide rod through the sliding sleeve.

[0013] Optionally, the detection component includes: a charge amplifier, which is arranged on the outside of the lifting seat and connected to the lifting seat; a digital signal processor, which is arranged on the outside of the lifting seat and connected to the lifting seat, and is electrically connected to the charge amplifier; a wireless transmission module, which is placed on the outside of the lifting seat and connected to the lifting seat, and is electrically connected to the digital signal processor.

[0014] Optionally, the detection component also includes: a PLC controller, which is arranged on the outer wall of the stand and connected to the stand, and the PLC controller is electrically connected to the electric push rod, the charge amplifier, the digital signal processor, and the wireless transmission module; a display screen, which is arranged on the top of the lifting seat and electrically connected to the PLC controller.

[0015] Optionally, the rotating assembly includes: a rotating shaft, which is arranged below the lifting seat and connected to the driving assembly; a detection table, which is arranged below the rotating shaft and connected to the rotating shaft and the stirring head to drive the stirring head to rotate; vertical rods, which are respectively arranged below the lifting seat and connected to the lifting seat; an arc groove, which is opened on the outside of the detection table; and an arc slider, which is arranged below multiple vertical rods and slidably connected to the arc groove to limit the rotation direction of the detection table.

[0016] Optionally, the rotating component also includes: a mounting groove, which is opened at the bottom of the detection table; a piezoelectric sensor, which is arranged inside the mounting groove and electrically connected to the detection component so that the detected pressure data is transmitted to the detection component; a fixed plate, which is arranged at the bottom of the piezoelectric sensor and connected to the stirring head.

[0017] Optionally, the rotating assembly includes: a driving assembly, which is arranged inside the lifting seat and connected to the rotating shaft to provide driving force for the rotating shaft.

[0018] Compared with the prior art, the present invention provides an axial force detection device for friction stir welding, comprising a frame assembly, a lifting assembly, a detection assembly, a rotating assembly, a stirring head, a transmission assembly and a receiving platform. During the friction stir welding process, the axial force detection device causes the stirring head to rotate along with the rotating assembly, and the receiving platform moves along the weld of the welding workpiece through the transmission assembly, so that the stirring head only bears its own axial pressure, thereby ensuring accurate detection of changes in the axial force of the stirring head at various stages during the friction stir welding process, which is beneficial to ensuring the quality of the friction stir welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By reading the detailed description below with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0020] Figure 1 It is a structural schematic diagram of an angle of the axial force detection device for friction stir welding of the present invention;

[0021] Figure 2 It is a structural schematic diagram of another angle of the axial force detection device for friction stir welding of the present invention;

[0022] Figure 3 It is a structural schematic diagram of another angle of the axial force detection device for friction stir welding of the present invention;

[0023] Figure 4 It is a schematic diagram of the internal structure of the receiving platform of the present invention;

[0024] Figure 5 It is a schematic diagram of the internal structure of the detection platform of the present invention;

[0025] Figure 6 It is a schematic diagram of the internal structure of the lifting seat of the present invention.

[0026] Description of Figure Numbers:

[0027] 1. Base; 2. Stand; 3. Top seat; 4. Electric push rod; 5. Lifting seat; 6. Rotating shaft; 7. Testing table; 8. Guide groove; 9. First screw; 10. Adjustment motor; 11. First nut seat; 12. Undertaking table; 13. Groove; 14. Welding workpiece; 15. PLC controller; 101. Universal ball head; 201. Guide rod; 202. Sliding sleeve; 203. Reinforcement rib; 501. Transmission cavity; 502. Driving motor; 503. Driving gear; 504. Moving gear; 505, vertical rod; 506, arc-shaped slider; 507, charge amplifier; 508, digital signal processor; 509, wireless transmission module; 510, display screen; 701, mounting groove; 702, piezoelectric sensor; 703, fixing plate; 704, stirring head; 705, annular groove; 121, accommodating cavity; 122, second screw; 123, second nut seat; 124, folding rod; 125, clamping block; 126, worm wheel; 127, worm; 128, hand wheel. DETAILED DESCRIPTION

[0028] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. If not specifically stated, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0029] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present invention should be the common meanings understood by those skilled in the art to which the present invention belongs. In this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Terms such as "connection" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. The terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "include..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0030] like Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, this embodiment provides an axial force detection device for stir friction welding, including: a frame assembly, including a top seat 3, a stand 2 and a base 1, the top seat 3 is connected to the base 1 through the stand 2; a lifting assembly, arranged between the top seat 3 and the base 1, and connected to the top seat 3, the lifting assembly performs lifting movement between the top seat 3 and the base 1; a detection assembly, arranged on the outside of the lifting assembly, and connected to the lifting assembly; a rotating assembly, arranged below the lifting assembly, and connected to the driving assembly, so that the rotating assembly can be lifted and lowered between the top seat 3 and the base 1 through the lifting assembly, and the rotating assembly can be lifted and lowered between the top seat 3 and the base 1. The rotating assembly is electrically connected to the detection assembly; the stirring head 704 is arranged below the rotating assembly and connected to the rotating assembly, so that the stirring head 704 can be lifted and lowered between the welding position and the standby position, and the stirring head 704 is rotated by the rotating assembly, and the stirring head 704 is electrically connected to the detection assembly through the rotating assembly; the transmission assembly is arranged between the base 1 and the stirring head 704 and connected to the base 1; the receiving platform 12 is arranged above the base 1 and connected to the transmission assembly, so that the welding workpiece 14 in the receiving platform 12 is friction welded with the stirring head 704 in the welding position.

[0031] Illustratively, this embodiment provides an axial force detection device for stir friction welding, including a frame assembly, a lifting assembly, a detection assembly, a rotating assembly, a stirring head 704, a transmission assembly and a receiving platform 12. During the process of stir friction welding, the axial force detection device causes the stirring head 704 to rotate along with the rotating assembly, and the receiving platform 12 moves along the weld of the welding workpiece 14 through the transmission assembly, so that the stirring head 704 only bears its own axial force, thereby ensuring accurate detection of changes in the axial force of the stirring head 704 at various stages during the stir friction welding process, which is beneficial to ensuring the quality of stir friction welding.

[0032] Optionally, a groove 13 is provided on the top of the receiving platform 12, and the welding workpiece 14 is placed in the groove 13. The length direction of the groove 13 is the same as the length direction of the base 1, so that the weld direction of the welding workpiece 14 is the same as the length direction of the base 1, thereby ensuring that the receiving platform 12 moves along the weld of the welding workpiece 14 through the transmission assembly. In this arrangement, the stirring head 704 only bears its own axial force, while the welding workpiece 14 inside the groove 13 of the receiving platform 12 bears the horizontal force, so that the accuracy of the axial force detection device in detecting the pressure change of the stirring head 704 at each stage is improved.

[0033] Exemplarily, reinforcing ribs 203 are welded between the base 1 and the top seat 3 and the rear side wall of the stand 2, which improves the strength of the finishing structure of the axial force detection device. A plurality of universal ball heads 101 are connected to the top of the base 1, and the upper ends of the universal ball heads 101 abut against the lower surface of the receiving platform 12 to provide auxiliary support, thereby further improving the stability of the receiving platform 12.

[0034] In a possible embodiment, Figure 1 , Figure 3 and Figure 4 As shown, the transmission assembly includes: a first transmission assembly, which is arranged inside the base 1, including: a first screw rod 9, both ends of which are connected to the base 1; a first nut seat 11, which is connected to the first screw rod 9, and when the first screw rod 9 rotates, the first nut seat 11 moves relative to the base 1.

[0035] Optionally, an adjustment motor 10 is provided on the outer wall of the base 1, and the output end of the adjustment motor 10 is connected to the end of the first screw 9. When the adjustment motor 10 is turned on, the adjustment motor 10 drives the first screw 9 to rotate, and then the first screw 9 drives the first nut seat 11 to move relative to the base 1 along the length direction of the first screw 9. In this way, the receiving platform 12 connected to the first nut seat 11 moves relative to the base 1 along the length direction of the first screw 9, and the welding workpiece 14 inside the groove 13 of the receiving platform 12 moves relative to the base 1 along the length direction of the first screw 9, so that the welding workpiece 14 is subjected to horizontal force, so that the stirring head 704 only bears its own axial force during the process of stir friction welding, thereby increasing the accuracy of the axial force detection of the stirring head 704.

[0036] The second transmission assembly is arranged inside the receiving platform 12, and includes: a receiving chamber 121; a second screw rod 122, which is arranged inside the receiving chamber 121 and connected to the outer wall of the receiving platform 12; a second nut seat 123, which is symmetrically arranged at both ends of the second screw rod 122; a folding rod 124, which passes through the side wall of the receiving platform 12, and the first end of the folding rod 124 is connected to the second nut seat 123; a clamping block 125, which is arranged above the receiving platform 12 and connected to the second end of the folding rod 124; a worm wheel 126, which is arranged inside the receiving chamber 121 and connected to the second screw rod 122; a worm wheel 127, which is arranged below the worm wheel 126 and meshes with the worm wheel 126; a hand wheel 128, which is arranged on the outer wall of the receiving platform 12 and connected to the worm wheel 127.

[0037] For example, in this embodiment, before the friction stir welding, the operator drives the worm 127 to rotate through the hand wheel 128, and the worm 127 and the worm wheel 126 are meshed with each other, thereby driving the worm wheel 126 to rotate, and the worm wheel 126 is sleeved on the second screw 122, thereby driving the second screw 122 to rotate. Since the second nut seat 123 is symmetrically arranged at both ends of the second screw 122, when the second screw 122 rotates, the two second nut seats 123 at both ends of the second screw 122 move relative to the second screw 122, thereby driving the folding rod 124 to move, so that the clamping block 125 on the folding rod 124 clamps the welding workpiece 14 on the receiving platform 12. This arrangement has a simple structure, stably clamps the welding workpiece 14, greatly improves the stability of the welding workpiece 14 during friction stir welding, and effectively avoids the influence of the instability of the welding workpiece 14 on the axial force detection of the stirring head 704, thereby ensuring the accuracy of the axial force detection of the stirring head 704.

[0038] In a possible embodiment, Figure 1 and Figure 4 As shown, the second screw rod 122 includes a first rod portion and a second rod portion, the first rod portion and the second rod portion are connected, and a worm gear 126 is sleeved on the connecting portion between the first rod portion and the second rod portion, and the thread rotation direction of the first rod portion is opposite to the thread rotation direction of the second rod portion.

[0039] Optionally, the operator turns the handwheel 128 clockwise to drive the worm 127 to rotate clockwise, and the worm 127 engages with the worm wheel 126, thereby driving the worm wheel 126 to rotate toward the operator. The worm wheel 126 is sleeved on the second screw 122, thereby driving the second screw 122 to rotate toward the operator. The two second nut seats 123 at both ends of the second screw 122 move toward the middle of the second screw 122, thereby driving the folding rod 124 to move toward the middle of the receiving platform 12, so that the clamping block 125 on the folding rod 124 clamps the welding workpiece 14 on the receiving platform 12.

[0040] Optionally, the operator rotates the handwheel 128 counterclockwise to drive the worm 127 to rotate counterclockwise, and the worm 127 engages with the worm wheel 126, thereby driving the worm wheel 126 to rotate away from the operator. The worm wheel 126 is sleeved on the second screw 122, thereby driving the second screw 122 to rotate away from the operator. The two second nut seats 123 at both ends of the second screw 122 move toward the two ends of the second screw 122, thereby driving the folding rod 124 to move toward both sides of the receiving platform 12, so that the clamping block 125 on the folding rod 124 loosens the welding workpiece 14 on the receiving platform 12.

[0041] In a possible embodiment, Figure 1 , Figure 2 and Figure 3As shown, the lifting assembly includes: an electric push rod 4, which is arranged below the top seat 3 and connected to the top seat 3; a lifting seat 5, which is arranged below the electric push rod 4 and connected to the electric push rod 4, so that the lifting seat 5 can be lifted and lowered between the top seat 3 and the base 1 through the electric push rod 4.

[0042] Optionally, there are two electric push rods 4, one end of each electric push rod 4 is connected to the end of the top seat 3, and the other end of each electric push rod 4 is connected to the lifting seat 5. The two electric push rods 4 have the same size and are symmetrically connected to the top seat 3 and the lifting seat 5, thereby ensuring that the lifting seat 5 only rises or falls in the vertical direction during the lifting process between the top seat 3 and the base 1, and always remains horizontal, thereby ensuring the welding quality during the stir friction welding process.

[0043] In a possible embodiment, Figure 1 , Figure 2 and Figure 3 As shown, the guide rod 201 is arranged on the side wall of the stand 2 and is arranged on the side close to the lifting seat 5 in a direction perpendicular to the base 1; the sliding sleeve 202 is arranged on the side wall of the lifting seat 5 and is sleeved on the guide rod 201, so that the lifting seat 5 can be lifted and lowered along the guide rod 201 through the sliding sleeve 202.

[0044] Exemplarily, there are two guide rods 201, which are respectively arranged at the left and right ends of the front side wall of the stand 2. The outer wall of each guide rod 201 is movably sleeved with a sliding sleeve 202 of corresponding size. The sliding sleeve 202 is fixedly connected to the outer wall of the lifting seat 5, thereby guiding and limiting the lifting movement of the lifting seat 5, ensuring that the lifting seat 5 can perform vertical lifting movement in a direction perpendicular to the base 1, thereby ensuring that during the stir friction welding process, the lifting seat 5 only performs lifting movement and does not move in the horizontal direction, thereby ensuring the accuracy of axial force detection during the stir friction welding process.

[0045] In a possible embodiment, Figure 1 As shown, the detection component includes: a charge amplifier 507, which is arranged on the outside of the lifting seat 5 and connected to the lifting seat 5; a digital signal processor 508, which is arranged on the outside of the lifting seat 5 and connected to the lifting seat 5, and is electrically connected to the charge amplifier 507; a wireless transmission module 509, which is placed on the outside of the lifting seat 5, connected to the lifting seat 5, and electrically connected to the digital signal processor 508.

[0046] For example, during the friction stir welding process, the stirring head 704 is subjected to an axial reaction force, and the piezoelectric sensor 702 is used to receive the electrical signal of the axial force, which is amplified by the charge amplifier 507 and then transmitted to the digital signal processor 508, so as to facilitate the collection of pressure detection data of the stirring head 704 during the welding process.

[0047] In a possible embodiment, Figure 1 and Figure 2 As shown, the detection component also includes: a PLC controller 15, which is arranged on the outer wall of the stand 2 and connected to the stand 2, and the PLC controller 15 is electrically connected to the electric push rod 4, the charge amplifier 507, the digital signal processor 508, and the wireless transmission module 509; a display screen 510, which is arranged on the top of the lifting seat 5 and is electrically connected to the PLC controller 15.

[0048] Exemplarily, the PLC controller 15 is embedded in the outer wall of the stand 2, so that the operator can control the PLC controller 15. At the same time, the display screen 510 is arranged on the top of the lifting seat 5, so that the operator can record the pressure detection result.

[0049] Illustratively, during the welding process, the stirring head 704 is subjected to an axial reaction force, and the piezoelectric sensor 702 is used to receive the axial force electrical signal, which is amplified by the charge amplifier 507 and transmitted to the digital signal processor 508. After processing and conversion, it is transmitted to the PLC controller 15 by the wireless transmission module 509, and finally the relevant data is displayed on the display screen 510 for the inspection personnel to observe, which is convenient and convenient for the stir friction welding process assessment and the control of welding quality.

[0050] In a possible embodiment, Figure 1 and Figure 3 As shown, the rotating assembly includes: a rotating shaft 6, which is arranged below the lifting seat 5 and connected to the driving assembly; a detection table 7, which is arranged below the rotating shaft 6 and connected to the rotating shaft 6 and the stirring head 704 to drive the stirring head 704 to rotate; vertical rods 505, which are respectively arranged below the lifting seat 5 and connected to the lifting seat 5; an arc groove, which is opened on the outside of the detection table 7; an arc slider 506, which is arranged below the multiple vertical rods 505 and is slidably connected to the arc groove to limit the rotation direction of the detection table 7.

[0051] Exemplarily, there are four vertical rods 505, which are evenly arranged along the circumference of the detection table 7, so that the detection table 7 is more stable during the process of rotating welding with the stirring head 704. The driving assembly drives the rotating shaft 6 to rotate, and the lower end of the rotating shaft 6 is connected to the detection table 7. The circumferential outer wall of the detection table 7 is provided with an arc groove, and the arc slider 506 is adapted to the arc groove. There are four arc sliders 506, corresponding to the number of vertical rods 505. One end of the arc slider 506 is fixedly connected to the vertical rod 505, and the other end of the arc slider 506 is located in the arc groove and slidably connected to the arc groove, so that the detection table 7 can maintain normal rotation when the stirring head 704 is kept for friction welding. At the same time, the detection table 7 is limited to rotate only in the axial direction of the stirring head 704, and no shaking in the horizontal direction occurs, thereby increasing the accuracy of the axial force detection of the stirring head 704.

[0052] In a possible embodiment, Figure 1 , Figure 3 and Figure 5 As shown, the rotating component also includes: a mounting groove 701, which is opened at the bottom of the detection platform 7; a piezoelectric sensor 702, which is arranged inside the mounting groove 701 and is electrically connected to the detection component so that the detected pressure data is transmitted to the detection component; a fixed plate 703, which is arranged at the bottom of the piezoelectric sensor 702 and is connected to the stirring head 704.

[0053] Exemplarily, the mounting groove 701 is opened in the middle position of the bottom of the detection platform 7 to ensure the balance of the detection platform 7 during the rotation of the stir friction welding, thereby increasing the stability of the stirring head 704 during the stir friction welding process, and making the detection of the axial force of the stirring head 704 more real and accurate.

[0054] Optionally, the fixing plate 703 and the lower end of the piezoelectric sensor 702 are connected by bolts to increase the stability between the two, which not only ensures the stability of the piezoelectric sensor 702, but also ensures the stability of the fixing plate 703, thereby increasing the stability of the stirring head 704 during the friction stir welding process. The piezoelectric sensor 702 is in the mounting groove 701 of the detection table 7, and the upper end of the piezoelectric sensor 702 is connected to the detection table 7 by bolts to increase the stability between the piezoelectric sensor 702 and the detection table 7. This arrangement allows the piezoelectric sensor 702 to be stably fixed inside the mounting groove 701 of the detection table 7, so that the stirring head 704 is always fixed inside the detection table 7 during the friction stir welding process, thereby accurately detecting the changes in pressure of the stirring head 704 at each stage. Furthermore, the piezoelectric sensor 702 is fixed inside the mounting groove 701 of the detection table 7. When the stirring head 704 performs rotational friction welding, the piezoelectric sensor 702 rotates with the detection table 7. When the pressure of the stirring head 704 changes at each stage, the piezoelectric sensor 702 always experiences the pressure changes at each stage together with the stirring head 704, thereby ensuring the accuracy of the stirring head 704 in detecting the axial force.

[0055] In a possible embodiment, Figure 1 and Figure 6 As shown, the rotating assembly includes: a driving assembly, which is arranged inside the lifting seat 5 and connected to the rotating shaft 6 to provide driving force for the rotating shaft 6.

[0056] Exemplarily, the driving assembly includes: a driven gear 504, which is arranged inside the lifting seat 5 and connected to the rotating shaft 6 to drive the rotating shaft 6 to rotate; a driving gear 503 is arranged inside the lifting seat 5 and meshed with the driven gear 504 to drive the driven gear 504 to move; a driving motor 502 is arranged on the side wall of the lifting seat 5 and connected to the driving gear 503 to provide driving force for the driving gear 503. In this arrangement, the driving motor 502 drives the driving gear 503, the driving gear 503 and the driven gear 504 mesh with each other, thereby driving the driven gear 504 to move, and the driven gear 504 is connected to the rotating shaft 6, thereby driving the rotating shaft 6 to rotate, thereby providing driving force for the rotating shaft 6.

[0057] Optionally, a transmission cavity 501 is provided in the lifting seat 5, a driving motor 502 is connected to the left side of the top of the lifting seat 5, a driving gear 503 is connected to the bottom output end of the driving motor 502, one end of the rotating shaft 6 extending into the transmission cavity 501 is connected to a driven gear 504, the driven gear 504 is meshed and connected to the driving gear 503, and four vertical rods 505 are connected to the bottom circumference of the lifting seat 5, and the lower ends of the four vertical rods 505 are connected to four corresponding arc-shaped slide blocks 506, and the four arc-shaped slide blocks 506 are slidably connected to the annular groove 705. This arrangement ensures the stability of the rotation of the detection platform 7 during the rotation of the stirring head 704, limits the detection platform 7 to rotate only in the axial direction of the stirring head 704, thereby ensuring the stability of the rotation of the stirring head 704, and finally makes the detection of the axial force of the stirring head 704 more accurate.

[0058] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An axial force detection device for friction stir welding, characterized in that: include: The frame assembly comprises a top seat, a vertical frame and a base, wherein the top seat is connected to the base through the vertical frame; A lifting assembly is disposed between the top seat and the base and connected to the top seat, and the lifting assembly performs lifting movement between the top seat and the base; A detection component is arranged outside the lifting component and connected to the lifting component; A rotating assembly is disposed below the lifting assembly and connected to the lifting assembly, so that the rotating assembly moves up and down between the top seat and the base through the lifting assembly, and the rotating assembly is electrically connected to the detection assembly; A stirring head is arranged below the rotating assembly and connected to the rotating assembly, so that the stirring head can be lifted and lowered between a welding position and a standby position, and the stirring head is rotated by the rotating assembly, and the stirring head is electrically connected to the detection assembly through the rotating assembly; A transmission assembly is disposed between the base and the stirring head and is connected to the base so as to move along the length direction of the base; The receiving platform is arranged above the base and connected with the transmission assembly, so that the welding workpiece in the receiving platform and the stirring head in the welding position are friction welded.

2. The axial force detection device for friction stir welding according to claim 1, characterized in that: The transmission assembly comprises: The first transmission assembly is arranged inside the base and includes: A first screw rod, both ends of which are connected to the base; a first nut seat connected to the first screw rod, so that the first nut seat moves relative to the base when the first screw rod rotates; The second transmission assembly is arranged inside the receiving platform and includes: A receiving cavity; A second screw rod is disposed inside the accommodating cavity and connected to the outer wall of the receiving platform; A second nut seat is symmetrically arranged at two ends of the second screw rod; A folding rod is passed through the side wall of the receiving platform, and a first end of the folding rod is connected to the second nut seat; A clamping block is disposed above the receiving platform and connected to the second end of the folding rod; A worm wheel is disposed inside the accommodating cavity and connected to the second screw; A worm, disposed below the worm wheel and meshing with the worm wheel; A hand wheel is arranged on the outer wall of the receiving platform and is connected with the worm.

3. The axial force detection device for friction stir welding according to claim 2, characterized in that: The second screw includes a first rod portion and a second rod portion, the first rod portion and the second rod portion are connected, and the connecting portion between the first rod portion and the second rod portion is sleeved with the worm gear, and the thread rotation direction of the first rod portion is opposite to the thread rotation direction of the second rod portion.

4. The axial force detection device for friction stir welding according to claim 1, characterized in that: The lifting assembly comprises: An electric push rod is arranged below the top seat and connected to the top seat; The lifting seat is arranged below the electric push rod and connected with the electric push rod, so that the lifting seat can be lifted and lowered between the top seat and the base through the electric push rod.

5. The axial force detection device for friction stir welding according to claim 4, characterized in that: The lifting assembly also includes: A guide rod is arranged on the side wall of the stand and is arranged on the side near the lifting seat in a direction perpendicular to the base; The sliding sleeve is arranged on the side wall of the lifting seat and sleeved on the guide rod, so that the lifting seat can move up and down along the guide rod through the sliding sleeve.

6. The axial force detection device for friction stir welding according to claim 4, characterized in that: The detection component comprises: A charge amplifier is arranged outside the lifting seat and connected to the lifting seat; A digital signal processor is disposed outside the lifting base and connected to the lifting base and electrically connected to the charge amplifier; The wireless transmitting module is disposed outside the lifting seat, connected to the lifting seat, and electrically connected to the digital signal processor.

7. The axial force detection device for friction stir welding according to claim 6, characterized in that: The detection component also includes: A PLC controller is disposed on the outer wall of the stand and connected to the stand, and the PLC controller is electrically connected to the electric push rod, the charge amplifier, the digital signal processor, and the wireless transmission module; The display screen is arranged on the top of the lifting seat and is electrically connected to the PLC controller.

8. The axial force detection device for friction stir welding according to claim 1, characterized in that: The rotating assembly comprises: A mounting groove is provided at the bottom of the testing platform; A piezoelectric sensor is disposed inside the mounting groove and is electrically connected to the detection component so that the detected pressure data is transmitted to the detection component; The fixed plate is arranged at the bottom of the piezoelectric sensor and connected with the stirring head.

9. The axial force detection device for friction stir welding according to claim 8, characterized in that: The rotating assembly further comprises: The driving assembly is arranged inside the lifting seat and connected with the rotating shaft to provide driving force for the rotating shaft.

10. The axial force detection device for friction stir welding according to claim 9, characterized in that: The rotating assembly comprises: A rotating shaft is disposed below the lifting seat and connected to the driving assembly; A detection platform is arranged below the rotating shaft and connected to the rotating shaft and the stirring head to drive the stirring head to rotate; Vertical rods are respectively arranged below the lifting seats and connected to the lifting seats; An arc-shaped groove is provided on the outer side of the testing platform; The arc-shaped sliding block is arranged below the plurality of vertical rods and is slidably connected with the arc-shaped groove to limit the rotation direction of the detection platform.

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