Friction stir welding tool for middle roof

Abstract

The utility model discloses a friction stir welding tool for a middle top, which comprises a base, a section bar supporting device is arranged on the base, a middle top section bar to be processed is placed on the section bar supporting device, pressing devices are arranged on the base and positioned on the upper side and the lower side of the section bar supporting device, a jacking device is arranged on one side of the base, and a clamping device is arranged on the other side of the base. The upper end and the lower end, located on the left side of the profile supporting device, of the base are each provided with a bearing pedestal base with a bearing pedestal, the bearing pedestals are connected together through main shafts, the ends, deviating from each other, of the two main shafts are connected with telescopic air cylinders through connecting arms, and the corresponding ends of the two main shafts are connected with the corresponding cantilevers correspondingly. A cantilever pressing device is arranged at the right end of the upper end face of the base, and the base is further provided with a safety device capable of preventing a cantilever from falling accidentally and automatically and a control device. The middle top profile is positioned through various measures, the profile can be effectively fixed, the middle top profile is prevented from displacing, and the efficiency in the friction stir welding production process is improved.

Description

Technical Field

[0001] The utility model relates to the manufacturing industry, in particular to a friction stir welding tool for a middle top. Background Art

[0002] As subway design and manufacturing technologies mature, the center roof, which is located in the middle of the car roof, plays the role of connection and lighting, and its aesthetics has attracted much attention. In recent years, the center roof has shown a trend of becoming wider in cross section. Figure 10 This is a cross-sectional view of the profile of a certain city's subway.

[0003] Since the price of extruded profiles is directly proportional to their cross-section, to minimize production costs while meeting design requirements, the profile is divided into three parts: a central aluminum plate and two identical smaller sections on the left and right sides. Both the central aluminum plate and the smaller sections are available at a relatively low cost, and then the three sections are welded together. Friction stir welding is the preferred method for tailored welding due to its minimal welding deformation, low cost, lack of light smoke pollution, and zero radiation.

[0004] The friction stir welding process requires that the workpiece to be welded needs to be rigidly fixed, that is, the middle aluminum plate and the small profiles on the left and right sides need to be reliably fixed, so this tooling is designed and manufactured. Utility Model Content

[0005] The technical problem to be solved by the utility model is that the middle top profile to be processed in the prior art needs to be rigidly fixed when performing stir friction welding.

[0006] In order to solve the above technical problems, the present invention provides a technical solution:

[0007] A stir friction welding tool for a middle top, comprising a base and a profile support device, wherein the profile support device is provided on the base, and the middle top profile to be processed is placed on the profile support device, and the base is symmetrically provided with clamping devices capable of pressing the middle top profile to be processed from the upper side at positions on the upper and lower sides of the profile support device, and a clamping device for pressing the middle top profile to be processed from the side is also provided at one side position, and the base is provided with bearing seat bases at the upper and lower ends on the left side of the profile support device, and each bearing seat base is provided with a pair of bearing seats with bearings, and the pairs of bearing seats are provided with bearing seats. The bearing seats are connected together by the main shaft passing through the corresponding bearings. The ends of the two main shafts that are away from each other are connected to the telescopic cylinder through the connecting arm, and the corresponding ends are respectively connected to the corresponding cantilevers. The other ends of the two cantilevers extend to the right side of the profile support device, and a cantilever clamping device is provided at the right end of the upper end surface of the base and the corresponding position of the cantilever for pressing the right end of the cantilever after the cantilever is fully lowered. A safety device that can prevent the cantilever from accidentally falling is provided on the bearing seat base corresponding to each cantilever, and a control device is also provided on the base.

[0008] Furthermore, the base is a thick steel plate, and is provided with a plurality of threaded holes to facilitate connection with the various components on its upper end surface. The base is provided with a central circular hole, which is connected to the stir friction welding platform through the central circular hole, playing a connecting role. In addition, the four corners of the base are respectively provided with lifting rings to facilitate the lifting of the base.

[0009] Furthermore, the middle top profile to be processed includes small profiles on both sides and a middle aluminum plate. The shape of the upper end face of the profile support device is matched with the contact end face of the middle top profile to be processed, and the upper end faces of the profile support devices under the small profiles on both sides are respectively provided with an anti-deformation inclined surface, so that a certain angle is formed between the small profiles on both sides and the middle aluminum plate, which can offset the welding deformation generated during welding of the welds, so that the overall flatness of the profile after welding meets the process requirements, eliminating the post-weld shaping process and improving production efficiency.

[0010] Furthermore, the clamping devices are distributed on the upper and lower sides of the profile supporting device, and the clamping devices on one side are evenly spaced from the jacking devices. The clamping arms on each of the clamping devices are provided with rubber head bolts, generally four rubber head bolts, which are used to contact and clamp the upper end faces of the small profiles on both sides through the rubber head bolts, and the clamping is achieved through soft materials without damaging the profiles.

[0011] Furthermore, an aluminum plate clamping block is provided on the clamping head of each clamping device. The aluminum plate clamping block contacts and clamps the side end face of the small profile on one side. During the clamping process, the aluminum plate clamping block undergoes plastic deformation, which can prevent the profile from deforming.

[0012] Furthermore, when the tightening device tightens the middle top profile to be processed, it tightens the corresponding small profile on one side, and then pushes the middle aluminum plate and the small profile on the other side, so that the three middle top components are tightened against each other, and the gaps between adjacent ones meet the requirements of stir friction welding.

[0013] Furthermore, the main shaft can rotate through the bearing in the corresponding bearing seat, the cantilever and the connecting arm are fixedly connected to the corresponding main shaft, the other end of the connecting arm is hingedly connected to the telescopic cylinder, and the two telescopic cylinders are both arranged on the base and are respectively located at the outer position of the clamping device on both sides.

[0014] Furthermore, an aluminum plate is provided on the lower end surface of each cantilever, and the cantilever is pressed against the upper end surface of the intermediate aluminum plate through the aluminum plate. A rubber is provided between the cantilever and the aluminum plate below the cantilever, and the function of the rubber is to make the pressure between the aluminum plate below the cantilever and the surface of the profile uniform during pressing;

[0015] Furthermore, a bearing group is provided on the pressing arm of the cantilever pressing device, and the cantilever pressing device contacts and presses the upper right end of the cantilever through the bearing group to prevent the right end of the cantilever from warping up. The pressing part contacts the cantilever end through the bearing group, which can achieve pressing and reduce wear.

[0016] Furthermore, the safety device includes a stop shaft containing a small cylinder, a limit switch, a solenoid valve and a support. The support is arranged between the two bearing seat bases. A limit switch is respectively provided on the upper end surface of the support close to the corresponding bearing seat base. Each limit switch corresponds to the corresponding cantilever.

[0017] Furthermore, a corresponding solenoid valve is respectively provided between the two limit switches on the support, and the solenoid valve is provided on the air path corresponding to the small cylinder. The small cylinder is connected to the air path of the control device through its corresponding air path, the limit switch is electrically connected to the solenoid valve, and the clamping device, the tightening device, the cantilever clamping device and the telescopic cylinder are respectively connected to the air path of the control device through their corresponding air paths.

[0018] Furthermore, the stop shaft is arranged on the telescopic end of the corresponding small cylinder, and the two small cylinders are respectively located on the two bearing seat bases outside the two cantilevers.

[0019] Furthermore, each of the stop shafts extends in the direction of the corresponding cantilever. After the cantilever is lifted into position, when the bottom of the cantilever touches the contact on the limit switch, the solenoid valve is activated, and the control device controls the small cylinder to extend the stop shaft until the stop shaft is located between the cantilever and the base.

[0020] Furthermore, the control device controls the extension of the telescopic end of the telescopic cylinder, and then lifts the cantilever through the connecting arm and the main shaft. After the cantilever is lifted into place, the middle top profile to be processed is placed on the profile support device by a crane, and the control device controls the tightening device to tighten one side of the middle top profile to be processed, and then the control device controls the clamping devices on both sides to clamp the upper end surfaces of the small profiles on both sides of the middle top profile to be processed, and then the control device controls the stop shaft to retract, and then controls the telescopic cylinder to retract, and uses the connecting arm to drive the main shaft to move, thereby driving the cantilever on the main shaft to descend until the lower end surface of the cantilever is pressed on the upper end surface of the middle aluminum plate on the middle top profile to be processed, and the cantilever clamping device is used to clamp the lowered cantilever end to prevent the cantilever end from warping up.

[0021] The beneficial effects of the utility model are:

[0022] 1. The utility model positions the middle top profile by adopting multiple measures such as positioning support, multiple tightening and pressing, which can effectively fix the profile, prevent the middle top profile from displacement, and improve the efficiency of the stir friction welding production process.

[0023] 2. The utility model can fix two welds after one-time pressing and fixing, saving the time required to fix multiple welds separately before welding, thereby improving work efficiency.

[0024] 3. In the present invention, the upper end surfaces of the profile support devices under the small profiles on both sides are respectively provided with an anti-deformation inclined surface, so that a certain angle is formed between the small profiles on both sides and the middle aluminum plate, which can offset the welding deformation generated during welding of the welds, so that the overall flatness of the profile after welding meets the process requirements, eliminating the post-weld correction process and improving production efficiency.

[0025] When the cantilever is lifted to a predetermined position, the stop shaft thereon will automatically extend between the cantilever and the base due to the cantilever touching the limit switch. During the normal operation of the cantilever, if the air source of the telescopic cylinder is suddenly disconnected accidentally, the telescopic cylinder loses pressure, the cantilever is heavy and long, and the cantilever loses its supporting force and may fall, resulting in a safety accident. At this time, without manual control of the second hand rotary valve, the stop shaft is always in the extended state under the action of the corresponding compressed air. When the bottom of the cantilever leaves the limit switch, the solenoid valve is triggered to close the air inlet and outlet of the corresponding air path of the small cylinder, and the compressed gas in the small cylinder is sealed in the small cylinder, which can ensure that the stop shaft does not move and is in the extended state. At this time, the stop shaft is still located between the cantilever and the base, and the stop shaft can support the cantilever and prevent it from falling. This prevents the risk of the cantilever accidentally falling by itself and protects the safety of the operator.

[0026] 5. The main body of the utility model is made of steel structure, which has high strength, compact structure and reasonable layout.

[0027] In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only partial schematic diagrams of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 This is an overall diagram of a friction stir welding tool for a middle top and its assembly and use method of the present invention;

[0030] Figure 2 for Figure 1 Side view of

[0031] Figure 3 for Figure 1 Structural view of the middle cantilever, connecting arm and telescopic cylinder;

[0032] Figure 4 for Figure 1 Schematic diagram of the structure of the middle pressing device;

[0033] Figure 5 for Figure 4 Left side view;

[0034] Figure 6 for Figure 1 Diagram showing the relationship between the middle tightening device and the profile;

[0035] Figure 7 for Figure 1 Schematic diagram of the structure of the middle cantilever pressing device;

[0036] Figure 8 for Figure 7 Left side view;

[0037] Figure 9 This is a structural diagram of the safety device in a friction stir welding tool for a middle top and its assembly and use method of the present invention;

[0038] Figure 10 It is the cross-section of the top profile to be processed;

[0039] Figure 11 This is a diagram of the circuit connections between the solenoid valve and the small cylinder and telescopic cylinder.

[0040] In the figure, 1-base, 2-profile support device, 3-small profile, 4-middle aluminum plate, 5-clamping device, 5A-rubber head bolt, 6-tensioning device, 6A-aluminum plate clamping block, 7-bearing seat base, 8-bearing seat, 9-main shaft, 10-connecting arm, 11-telescopic cylinder, 12-cantilever, 12A-aluminum plate, 13-cantilever clamping device, 13A-bearing group, 14-support, 15-limit switch, 16-solenoid valve, 17-stop shaft, 18-control device. DETAILED DESCRIPTION

[0041] The following describes embodiments of the present invention in more detail with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0042] In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "setting", "connection", "fixation", and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0043] The names of the messages or information exchanged between multiple devices in the embodiments of the present invention are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0044] Example: Figure 1-10 As shown,

[0045] A stir friction welding tool for a middle top includes a base 1 made of thick steel plates, a profile support device 2 is fixed on the base 1, and the middle top profile to be processed is arranged on the profile support device 2. The middle top profile to be processed includes small profiles 3 on both sides and a middle aluminum plate 4. The shape of the upper end surface of the profile support device 2 matches the contact end surface of the middle top profile to be processed, and an anti-deformation inclined surface is respectively provided on the upper end surface of the profile support device 2 located under the small profiles 3 on both sides, so that a certain angle is formed between the small profiles 3 on both sides and the middle aluminum plate 4, which can offset the welding deformation generated during welding of the weld, so that the overall flatness of the profile after welding meets the process requirements, eliminating the post-weld shaping process, and improving production efficiency.

[0046] Two groups of 24 clamping devices 5 are symmetrically arranged on the upper and lower sides of the profile support device 2 on the base. The clamping device 5 is a welding clamping cylinder. When the welding clamping cylinder is opened, the workpiece can be placed or removed. There are four rubber head bolts 5A on the clamping arm of each welding clamping cylinder. The rubber head bolts 5A are in contact with the upper end faces of the small profiles 3 on both sides and are clamped. The clamping is achieved through soft material without damaging the profile.

[0047] A group of 12 tightening devices 6 are evenly distributed on the base at the upper side of the profile support device 2. The clamping device 5 and the tightening device 6 are evenly spaced. An aluminum plate clamping block 6A is provided on the tightening head of each tightening device 6, and the aluminum plate clamping block 6A contacts and clamps the side end face of the small profile 3 on one side.

[0048] Bearing seat bases 7 are provided at the upper and lower ends of the base 1 on the left side of the profile support device 2. Each bearing seat base 7 is provided with a pair of bearing seats 8 with bearings. The pairs of bearing seats 8 are connected together through the main shaft 9 passing through the corresponding bearings, and both ends of the main shaft 9 pass through the corresponding bearing seats 8. The main shaft 9 can rotate in the corresponding bearing seat 8 through the bearings. The opposite ends of the two main shafts 9 are fixedly connected with connecting arms 10, and the other end of each connecting arm 10 is hingedly connected to the corresponding telescopic cylinder 11. The two telescopic cylinders 11 are respectively provided on the base and are respectively located at the outer positions of the clamping device 5 on both sides.

[0049] The close ends of the two main shafts 9 are respectively fixedly connected to the corresponding cantilevers 12, and the other ends of the two cantilevers 12 extend to the right side of the profile support device 2. The position of the cantilever 12 corresponds to the position of the middle aluminum plate 4 on the top profile to be processed on the profile support device 2. An aluminum plate 12A is provided on the lower end surface of each cantilever 12, and the cantilever 12 is in contact and pressed with the upper end surface of the middle aluminum plate 4 through the aluminum plate 12A.

[0050] A cantilever pressing device 13 is provided at the right end of the upper end surface of the base corresponding to the cantilever 12, which is used to press the upper right end of the cantilever 12 after the cantilever 12 is fully lowered. A bearing group 13A is provided on the pressing arm on the cantilever pressing device 13. The cantilever pressing device 13 contacts and presses the upper right end of the cantilever 12 through the bearing group 13A to prevent the right end of the cantilever 12 from warping up. The pressing part contacts the end of the cantilever 12 through the bearing group 13A, which can achieve compression and reduce wear.

[0051] A support 14 is provided on the base 1 between the two bearing seat bases 7. A limit switch 15 is fixed at the left and right ends of the upper end surface of the support 14 corresponding to the position of the cantilever 12. Two solenoid valves 16, each electrically connected, are provided between the two limit switches 15. The position of the limit switch 15 corresponds to the position of the cantilever 12.

[0052] A small cylinder is provided on the base of the two bearing seats 8 located outside the two cantilevers 12. A stop shaft 17 is fixed on the telescopic end of the two small cylinders, and each stop shaft 17 extends in the direction of the corresponding cantilever 12.

[0053] The small cylinder is connected to the control device 18 through its corresponding air circuit, the normally closed solenoid valve 16 is arranged on the air circuit corresponding to the small cylinder, and the clamping device 5, the pressing device 6, the cantilever clamping device 13 and the telescopic cylinder 11 are all electrically connected to the control device 18 through their corresponding air circuits.

[0054] In this embodiment, the first hand-rotating valve on the control device 18 controls the extension and contraction of the telescopic cylinder 11, and the second hand-rotating valve controls the extension and contraction of the small cylinder. The first hand-rotating valve and the second hand-rotating valve are both five-port four-way valves, which respectively control the air inlet and outlet of the telescopic cylinder 11 and the small cylinder. The connection relationship between the first hand-rotating valve and the second hand-rotating valve and the telescopic cylinder 11 and the small cylinder is shown in the figure. Figure 11 As shown:

[0055] Compressed air enters and exits different ports of the telescopic cylinder through the first hand-turn valve and the corresponding air path, causing the telescopic rod on the telescopic cylinder 11 to extend or contract, thereby controlling the raising and lowering of the cantilever 12;

[0056] Compressed air enters and exits different ports of the small cylinder through the second hand-operated valve and the corresponding air path, causing the stopper shaft 17 on the small cylinder to extend or contract. However, because a common normally closed solenoid valve 16 is provided on the corresponding air inlet and outlet pipes between the second hand-operated valve and the small cylinder, the air path is blocked at this time and the small cylinder does not move.

[0057] When the cantilever 12 rises and its bottom hits the limit switch 15, the normally closed solenoid valve 16 is triggered to operate, so that the normally closed solenoid valve 16 is in the open state. At this time, the air path corresponding to the small cylinder is unobstructed, and compressed air enters and exits different ports of the small cylinder through the second manual valve and the corresponding air path, thereby controlling the extension or retraction of the stop shaft 17 on the small cylinder;

[0058] After the cantilever 12 is raised, if the telescopic cylinder 11 suddenly loses pressure unexpectedly and the cantilever 12 drops, without manual control of the second hand valve, the stop shaft 17 is always in the extended state under the action of the compressed air entering the small cylinder through the corresponding air path of the small cylinder; when the bottom of the cantilever 12 leaves the limit switch 15, the solenoid valve 16 is triggered to act and return to the original normally closed solenoid valve 16. At this time, the normally closed solenoid valve 16 closes the air inlet and outlet of the corresponding air path of the small cylinder, and the compressed gas in the small cylinder is sealed in the small cylinder, which can ensure that the stop shaft 17 does not move and is in the extended state. At this time, the stop shaft 17 is still located between the cantilever 12 and the base. The stop shaft 17 can support the cantilever and prevent it from falling, thereby preventing the risk of the cantilever 12 accidentally falling on its own and protecting the safety of the operator.

[0059] During assembly, the base 1 is first placed on the friction stir welding platform and connected to the friction stir welding platform through the central circular hole on the base 1.

[0060] Then, according to the shape and size of the middle top profile to be processed, the profile support device 2 is made using steel plates, steel pipes and aluminum blocks. The shape of the upper end surface of the profile support device 2 matches the contact end surface of the middle top profile to be processed, and the profile support device 2 is fixed to the upper end surface of the base 1 using corresponding bolts.

[0061] On the upper end surface of the base 1 , the pressing devices 5 are symmetrically and evenly distributed at the upper and lower sides of the profile support device 2 , and all the pressing devices 5 are fixed by corresponding bolts.

[0062] On the upper end surface of the base 1 , tightening devices 6 are evenly distributed above the profile support device 2 . The tightening devices 6 are spaced apart from the pressing devices 5 , and all the tightening devices 6 are fixed with corresponding bolts.

[0063] On the upper end surface of the base 1, the upper and lower ends of the left side of the profile support device 2 are fixed with corresponding bolts to the bearing seat base 7, and each bearing seat base 7 is fixed with a symmetrically arranged bearing seat 8 with a bearing by corresponding bolts.

[0064] The two bearing seats 8 symmetrically arranged on each bearing seat base 7 are connected by using a main shaft 9 to pass through the corresponding bearings, and both ends of the main shaft 9 pass through the corresponding bearing seats 8, and the opposite ends of the two main shafts 9 are fixedly connected to one end of the connecting arm 10.

[0065] Two telescopic cylinders 11 are respectively arranged on the base 1 at outer positions of the upper and lower pressing devices 5 , and the telescopic end of each telescopic cylinder 11 is hingedly connected to the other end of the connecting arm 10 .

[0066] The position of the cantilever 12 is determined according to the position of the middle aluminum plate 4 on the middle top profile to be processed placed on the profile support device 2, and a support 14 is set on the base 1 between the two bearing seat bases 7. A limit switch 15 is fixed at the left and right ends of the upper end surface of the support 14 at the corresponding positions of the cantilever 12, and two solenoid valves 16 electrically connected to each other are set between the two limit switches 15.

[0067] A small cylinder is provided on each of the two bearing seat bases located outside the two cantilevers 12 , and a stop shaft 17 is fixed on the telescopic end of the two small cylinders, and each stop shaft 17 extends in the direction of the corresponding cantilever 12 .

[0068] Place the two cantilevers 12 at corresponding positions on the profile support device 2, and fix the two cantilevers 12 to the corresponding ends of the main shaft 9 respectively. Use the connecting arm 10 through the telescopic cylinder 11 to drive the main shaft 9 to rotate, thereby driving the cantilever 12 on the main shaft 9 to rise or fall.

[0069] A cantilever pressing device 13 is provided on the base at a position on the right side of the profile supporting device 2 corresponding to the cantilever 12 and is fixed with corresponding bolts.

[0070] The control device 18 is fixed on the base with corresponding bolts, and the control device 18 is connected with the pressing device 5, the jacking device 6, the cantilever pressing device 13, the telescopic cylinder 11, the small cylinder and the safety device.

[0071] When in use, the telescopic end of the telescopic cylinder 11 is extended by the control device 18, and the cantilever 12 is lifted through the connecting arm 10 and the main shaft 9. After the cantilever 12 is lifted into place, when the bottom of the cantilever 12 touches the contact on the limit switch 15, the solenoid valve 16 is actuated, and the control device 18 controls the small cylinder to extend the stop shaft 17 by controlling the air circuit until the stop shaft 17 is located between the cantilever 12 and the base. The middle top profile to be processed is placed on the profile support device 2 by a crane, and the top tightening device 6 is controlled by the control device 18 to tighten the middle top profile to be processed. The side surfaces of the small profiles 3 on the side are tightened, and then the pressing devices 5 on both sides are controlled by the control device 18 to press the upper end surfaces of the small profiles 3 on both sides on the middle top profile to be processed, and then the stop shaft 17 is retracted by the control device 18, and then the telescopic cylinder 11 is controlled to use the connecting arm 10 to drive the main shaft 9 to move, and then drive the cantilever 12 on the main shaft 9 to descend until the lower end surface of the cantilever 12 is pressed against the upper end surface of the middle aluminum plate 4 on the middle top profile to be processed, and the cantilever pressing device 13 is used to press the end of the cantilever 12 after it is lowered to prevent the end of the cantilever 12 from warping.

[0072] Note that the above are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are readily apparent to those skilled in the art without departing from the scope of protection of the present invention. Therefore, while the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the appended claims.

Claims

1. A friction stir welding tool for a mid-top, comprising a base and a profile support device, characterized by: The profile supporting device is provided on the base, and the middle top profile to be processed is placed on the profile supporting device. The base is symmetrically provided with pressing devices that can press the middle top profile to be processed from the upper side at the upper and lower sides of the profile supporting device, and a tightening device for tightening the middle top profile to be processed from the side is also provided at one side. The base is provided with bearing seat bases at the upper and lower ends of the left side of the profile supporting device, and each bearing seat base is provided with a pair of bearing seats with bearings, and the pairs of bearing seats are respectively connected by The main shafts are connected together through corresponding bearings, and the ends of the two main shafts that are away from each other are connected to telescopic cylinders through connecting arms, and the corresponding ends are respectively connected to corresponding cantilevers. The other ends of the two cantilevers extend to the right side of the profile support device, and a cantilever clamping device for clamping the right end of the cantilever after the cantilever is fully lowered is provided at the right end of the upper end surface of the base and the corresponding position of the cantilever. A safety device that can prevent the cantilever from accidentally falling is provided on the bearing seat base corresponding to each cantilever, and a control device is also provided on the base.

2. The friction stir welding tool for a middle top according to claim 1, characterized in that: The middle top profile to be processed includes small profiles on both sides and a middle aluminum plate. The shape of the upper end surface of the profile support device matches the contact end surface of the middle top profile to be processed, and the upper end surface of the profile support device under the small profiles on both sides is respectively provided with an anti-deformation inclined surface.

3. The friction stir welding tool for a middle top according to claim 2, characterized in that: The clamping devices are evenly distributed on the upper and lower sides of the profile supporting device, and the clamping devices on one side are evenly spaced from the jacking devices. The clamping arms on each of the clamping devices are provided with rubber head bolts, which are used to contact and clamp the upper end faces of the small profiles on both sides; the clamping heads on each of the jacking devices are provided with aluminum plate clamping blocks, which are used to contact and clamp the side end faces of the small profiles on one side.

4. The friction stir welding tool for a middle top according to claim 3, characterized in that: The main shaft can rotate through the bearing in the corresponding bearing seat. The cantilever and the connecting arm are fixedly connected to the corresponding main shaft. The other end of the connecting arm is hingedly connected to the telescopic cylinder. The two telescopic cylinders are both arranged on the base and are respectively located at the outer positions of the clamping devices on both sides.

5. The friction stir welding tool for a middle top according to claim 4, characterized in that: An aluminum plate is provided on the lower end surface of each cantilever, and rubber is provided between the lower end surface of the cantilever and the aluminum plate, and the cantilever is in contact and pressed with the upper end surface of the middle aluminum plate through the aluminum plate; a bearing group is provided on the pressing arm on the cantilever pressing device, and the cantilever pressing device is in contact and pressed with the upper end of the right end of the cantilever through the bearing group.

6. The friction stir welding tool for a middle top according to claim 5, characterized in that: The safety device includes a stop shaft containing a small cylinder, a limit switch, a solenoid valve and a support. The support is arranged between the two bearing seat bases. A limit switch is respectively provided on the upper end surface of the support near the corresponding bearing seat base. Each limit switch corresponds to the corresponding cantilever. A corresponding solenoid valve is respectively provided between the two limit switches on the support, and the solenoid valve is arranged on the air path corresponding to the small cylinder. The small cylinder is connected to the air path of the control device through its corresponding air path. The limit switch is electrically connected to the solenoid valve, and the solenoid valve is a normally closed solenoid valve.

7. The friction stir welding tool for a middle top according to claim 6, characterized in that: The pressing device, the jacking device, the cantilever pressing device and the telescopic cylinder are all connected to the air circuit of the control device through their corresponding air circuits.

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