Profile asynchronous multi-core expansion jacking device, method and welding device thereof

Abstract

This invention relates to an asynchronous multi-core expansion support device and method for profiles, as well as a welding apparatus. The support device includes multiple first support blocks, multiple second support blocks, a first driving device, and a second driving device. The first and second support blocks are initially staggered and spaced apart on the same plane. The first and second driving devices respectively drive the multiple first and second support blocks to simultaneously push towards the inner wall of the profile. The pushing speed of the first and second support blocks is adjusted according to the required support distance. The multiple first and second support blocks simultaneously push against the inner wall of the profile, covering the entire cross-section of the inner wall. During the pushing process before pushing against the inner wall, the first and second support blocks maintain a staggered relationship. This invention can avoid support gaps between adjacent support blocks, prevent obvious indentations on the profile after support, improve product appearance quality, and enhance the welding sealing of the profile.

Description

Technical Field

[0001] This invention relates to the field of welding fixture technology, specifically to an asynchronous multi-core expansion support device for profiles, its method, and a welding apparatus. Background Technology

[0002] Aluminum components are widely used in vehicle parts due to their lightweight and corrosion resistance. Examples include car door sill beams, car crash beams, car body panels, motorcycle exterior panels, and motorcycle battery housings. In the production of the battery housing, aluminum is first extruded to form a hollow cylinder. Then, a matching end cap is welded to one end of the cylinder, resulting in a semi-enclosed battery housing for housing the motorcycle's battery pack.

[0003] During the extrusion production of cylindrical profiles, factors such as the temperature instability of hot extrusion, the rapid temperature changes during quenching, the adjustment of online tensile strength, and the indentation of the profile under pressure on the cooling bed often prevent the cross-sectional shape of the cylinder from precisely meeting welding requirements. According to laser welding requirements, the error between the edge of the end cap and the edge of the profile cross-section cannot exceed 0.2mm; otherwise, the sealing performance of the welded product will not meet the usage requirements. Therefore, during the welding of the cylinder and the end cap, tooling is needed to temporarily correct the cross-sectional shape of the cylinder to ensure shape matching between the edge of the end cap and the edge of the cylinder during the welding process.

[0004] Existing straightening fixtures typically have shape-matching top blocks connected to a power element. The power element ejects multiple top blocks radially and presses them against the inner surface of the aluminum profile workpiece, thus forcibly straightening the aluminum profile wall panel to achieve the effect of the aluminum profile cylinder conforming to the cavity shape.

[0005] Existing straightening fixtures are mostly synchronous expansion fixtures, where multiple push blocks advance at the same speed and simultaneously push against the inner wall of the profile. To avoid interference between adjacent push blocks, only narrow push blocks can be used. When finally pushing against the inner wall of the profile, there will be a large gap between adjacent push blocks, making it impossible to achieve full-section expansion support of the profile's inner cavity. If the profile cylinder material has high hardness and toughness, no indentation or mark may be produced after being supported by the fixture; however, if the material cylinder wall is thin, or the material has low hardness and toughness, obvious indentations will be produced in the gaps between adjacent push blocks after being pressed by the fixture blocks. This not only affects the product's appearance quality, but also the lack of effective support in the missing parts of the support may cause insufficient local support of the workpiece, affecting the welding seal. Summary of the Invention

[0006] To address the problems existing in the prior art, the purpose of this invention is to provide an asynchronous multi-core expansion support device and method for profiles, as well as a welding device, which can avoid interference from the top block, achieve full-section expansion support of the profile's inner cavity, avoid producing obvious indentations, and improve the welding sealing performance of the profile.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: An asynchronous multi-core expansion support device for profiles includes multiple first top blocks, multiple second top blocks, a first driving device, a second driving device, and a control device disposed within the profile. The first and second driving devices are both vertically positioned at the center of the profile. Multiple first top blocks are arranged around the first driving device, and multiple second top blocks are arranged around the second driving device. The first and second top blocks are arranged at intervals on the same plane. The initial positions of the first and second top blocks are staggered to avoid interference. The first driving device is connected to a plurality of first top blocks and is used to drive the plurality of first top blocks to push forward simultaneously toward the inner wall of the profile; the second driving device is connected to a plurality of second top blocks and is used to drive the plurality of second top blocks to push forward simultaneously toward the inner wall of the profile. The first and second top blocks are each equipped with a distance measuring sensor to determine the required support distance between the first and second top blocks; The control device is used to adjust the jacking speed of the first and second jacking blocks according to the required jacking distance of the first and second jacking blocks, so that multiple first jacking blocks and multiple second jacking blocks can simultaneously jacking the inner wall of the profile and covering the entire cross section of the inner wall of the profile, and the first and second jacking blocks maintain a staggered relationship during the jacking process before jacking the inner wall of the profile.

[0008] The first driving device includes a core rod, a first motor, and multiple first support rods; the core rod is vertically located at the center of the profile; the first motor is connected to the core rod and is used to drive the core rod to move up and down; the multiple first support rods correspond one-to-one with multiple first top blocks; the two ends of the first support rods are respectively hinged to the first top blocks and the core rod, and are used to convert the up and down movement of the core rod into the horizontal supporting movement of the first top blocks.

[0009] The first drive device also includes a first slide rail, which extends along the direction from the core rod to the inner wall of the profile, and a first top block is slidably connected to the first slide rail.

[0010] The second driving device includes a sleeve, a second motor, and multiple second support rods; the sleeve is sleeved outside the core rod and slidably connected to the core rod; the second motor is connected to the sleeve and is used to drive the sleeve to move up and down; the multiple second support rods correspond one-to-one with multiple second top blocks; the two ends of the second support rods are respectively hinged to the second top blocks and the sleeve, and are used to convert the up and down movement of the sleeve into the horizontal supporting movement of the second top blocks; the hinge position between the sleeve and the second support rods is lower than the hinge position between the core rod and the first support rods.

[0011] The second drive device also includes a second slide rail, which is located on the same plane as the first slide rail. The second slide rail extends along the direction from the sleeve to the inner wall of the profile, and the second top block is slidably connected to the second slide rail.

[0012] The inner surface of the sleeve is provided with multiple vertical inner positioning keys, and the core rod is provided with multiple vertical positioning grooves. The inner positioning keys slide up and down in the positioning grooves. The outer surface of the sleeve is also provided with multiple vertical outer positioning keys for sliding connection with peripheral components.

[0013] The upper part of the sleeve is a slotted part, and the position and number of slots in the slotted part are matched with the first support rod, which extends out from the slotted part.

[0014] The asynchronous multi-core expansion bracing method for profiles includes the following steps: The first driving device drives multiple first top blocks to push towards the inner wall of the profile simultaneously; The second drive device drives multiple second push blocks to push towards the inner wall of the profile simultaneously; Obtain the required support distance between the first and second top blocks; Based on the required jacking distance of the first and second jacking blocks, the jacking speed of the first and second jacking blocks is adjusted accordingly, so that multiple first jacking blocks and multiple second jacking blocks simultaneously jacke to the inner wall of the profile and cover the entire cross section of the inner wall of the profile. During the jacking process before jacking the inner wall of the profile, the first and second jacking blocks maintain a staggered relationship.

[0015] The method to maintain the misalignment of the first and second jacking blocks during the jacking process is as follows: the required jacking distances of the first and second jacking blocks are d1 and d2, respectively, and the jacking speeds of the first and second jacking blocks are V1 and V2, respectively. The control device controls the jacking speeds of the first and second jacking blocks to satisfy: V1 / V2=d1 / d2.

[0016] A welding apparatus includes a welding torch and the aforementioned asynchronous multi-core expansion support device for profiles; The asynchronous multi-core expansion support device for profiles is used to support and cover the entire cross-section of the inner wall of the profile; The welding torch is located on one side of the asynchronous multi-core expansion support device for profiles and is used to weld the edges of the profiles after the support is applied.

[0017] In summary, the present invention has the following advantages: 1. The asynchronous multi-core expansion type top support tooling of the present invention utilizes two sets of spaced and staggered first and second top blocks. By controlling different jacking speeds, it can achieve the use of wider top blocks without mutual interference during the jacking process, and simultaneously reach and support the entire cross-section of the inner wall of the profile. This avoids jacking gaps between adjacent top blocks, and the profile after jacking will not have obvious indentations, thus improving the product appearance quality and enhancing the welding sealing of the profile.

[0018] 2. The two sets of top blocks in this invention are driven by independent driving devices. The movement amplitude and timing of the top blocks in the same set are consistent, with high synchronization, which improves the accuracy of the top support.

[0019] 3. The asynchronous multi-core expansion support tooling of the present invention has a simple structure, reliable operation, small footprint, and can be applied to the expansion needs of profile cylinders of various sizes.

[0020] 4. The present invention adopts an asynchronous jacking and synchronous pressing expansion process, which can minimize the formation of top marks on the edge of the top block in the inner cavity of the profile.

[0021] 5. This invention uses a laser rangefinder sensor at the outer end of the top block to achieve precise position control of the top block through mathematical relationships. This effectively prevents the top block from exceeding the support range and causing over-support, which would result in product dimensional deviations. At the same time, it also enables the servo motor to precisely control any position of the top block, improving the support accuracy. Attached Figure Description

[0022] Figure 1 This is a top view of the structure of the first and second top blocks in the supporting state in Embodiment 1; Figure 2 This is a top view of the first and second top blocks in the retracted state in Embodiment 1. Figure 3 This is a schematic diagram of the overall main structure of the tooling in the retracted state of the first top block in Example 1; Figure 4 This is a schematic diagram of the overall main structure of the tooling in the first top block support state in Example 1; Figure 5 for Figure 3 Enlarged structural diagram at point I; Figure 6 This is a schematic diagram of the overall main structure of the tooling in the retracted state of the second top block in Example 1; Figure 7 This is a schematic diagram of the overall main structure of the tooling in the second top block support state of Embodiment 1; Figure 8 for Figure 6 Enlarged structural diagram at point II; Figure 9 This is a schematic diagram of the structure of the first gear screw block (or the second gear screw block); Figure 10 This is a schematic diagram of the sleeve structure; Figure 11 A structural schematic diagram showing the assembled sleeve and core rod; Figure 12 This is a top view of the first and second top blocks in the supporting state in Embodiment 2; Figure 13 This is a top view of the first and second top blocks in the retracted state in Embodiment 2; Figure 14 This is a schematic diagram showing the calculation parameters for the lifting height of the lower hinge point of the first strut.

[0023] In the picture: 11-Profile; 12-End cap; 21-Upper platform; 22-Lower platform; 23-Lower mounting bracket; 3-Sleeve; 31-Slotted part; 32-Second lead screw part; 33-Second gear block; 34-Second transmission box; 35-Second motor; 36-Second guide sleeve; 37-Inner positioning key; 38-Outer positioning key; 4-Core rod; 41-First lead screw part; 42-First gear block; 43-First transmission box; 44-First motor; 45-First guide sleeve; 51-First top block; 52-First support rod; 53-First slide rail; 61-Second top block; 62-Second support rod; 63-Second slide rail. Detailed Implementation

[0024] The present invention will now be described in further detail.

[0025] like Figure 1 , Figure 2 As shown, an asynchronous multi-core expansion support device for profiles includes a plurality of first top blocks 51, a plurality of second top blocks 61, a first drive device, a second drive device, and a control device disposed within the profile 11. The first driving device and the second driving device are both vertically arranged at the center of the profile 11. A plurality of first top blocks 51 are arranged around the first driving device, and a plurality of second top blocks 61 are arranged around the second driving device. The first top blocks 51 and the second top blocks 61 are arranged at intervals on the same plane, which overlaps with the entire cross section of the inner wall of the profile 11 to be supported.

[0026] The first driving device is connected to a plurality of first top blocks 51 and is used to drive the plurality of first top blocks 51 to push forward simultaneously toward the inner wall of the profile 11; the second driving device is connected to a plurality of second top blocks 61 and is used to drive the plurality of second top blocks 61 to push forward simultaneously toward the inner wall of the profile 11. The first top block 51 and the second top block 61 are respectively equipped with distance measuring sensors to determine the required support distance of the first top block 51 and the second top block 61, that is, in the initial state, the distance between the support surface of the first top block 51 and the second top block 61 and the inner wall of the profile 11 in their respective directions. The control device is used to adjust the jacking speed of the first top block 51 and the second top block 61 according to the required jacking distance of the first top block 51 and the second top block 61, so that the multiple first top blocks 51 and the multiple second top blocks 61 simultaneously jack to the inner wall of the support profile 11 and cover the entire cross section of the inner wall of the profile 11, and do not interfere with each other during the jacking process before contacting the inner wall of the profile 11.

[0027] The initial positions of the first top block 51 and the second top block 61 are offset to avoid interference. Specifically, the first top block 51 is closer to the inner wall of the profile 11 than the second top block 61, so that the first top block 51 can be widened and extended into the moving path of the second top block 61 without interfering with the misaligned second top block 61. Similarly, the second top block 61 can also be widened and extended into the moving path of the first top block 51 without interfering with the misaligned first top block 51. Therefore, compared to existing synchronous expansion tooling which has to use narrower top blocks to avoid interference, this invention makes full use of the space generated by the misalignment of the initial position of the top blocks. The jacking speed of the first top block 51 and the second top block 61 is adjusted according to the required jacking distance of the first top block 51 and the second top block 61. The misalignment relationship between the two is maintained throughout the jacking process, so that a wider first top block 51 and a wider second top block 61 can be used without interference. At the same time, by controlling the jacking speed of the first top block 51 and the second top block 61 respectively, for example, the jacking speed of the second top block 61 is greater than that of the first top block 51, so that the second top block 61 catches up from behind and, at the last moment of the jacking process of the first top block 51 and the second top block 61, changes from the original misalignment relationship to simultaneously reaching the inner wall of the contact profile 11. Thus, the wider first top block 51 and the wider second top block 61 can cover the entire cross section of the inner wall of the profile 11. There are no pressure gaps between adjacent top blocks, which can prevent obvious indentations on profile 11, improve the appearance quality, and help improve the welding seal during subsequent welding.

[0028] like Figure 5 As shown, specifically, the first driving device includes a core rod 4, a first motor 44, a first slide rail 53, and multiple first support rods 52. The core rod 4 is vertically positioned at the center of the profile 11, and the first motor 44 is connected to the core rod 4 to drive the core rod 4 to move up and down. The multiple first support rods 52 correspond one-to-one with multiple first top blocks 51. The two ends of the first support rod 52 are respectively hinged to the first top block 51 and the core rod 4 to convert the up and down movement of the core rod 4 into the horizontal supporting movement of the first top block 51. The first slide rail 53 extends along the direction from the core rod 4 to the inner wall of the profile 11, and the first top block 51 is slidably connected to the first slide rail 53.

[0029] like Figure 8As shown, the second driving device includes a sleeve 3, a second motor 35, a second slide rail 63, and multiple second support rods 62. The sleeve 3 is coaxially sleeved on the outside of the core rod 4 and slidably connected to the core rod 4. The upper and lower ends of the core rod 4 protrude from the sleeve 3, respectively. The second motor 35 is connected to the sleeve 3 and is used to drive the sleeve 3 to move up and down. The multiple second support rods 62 correspond one-to-one with the multiple second top blocks 61. The two ends of the second support rods 62 are respectively hinged to the second top blocks 61 and the sleeve 3, and are used to convert the up and down movement of the sleeve 3 into the horizontal supporting movement of the second top blocks 61. The second slide rail 63 and the first slide rail 53 are located on the same plane. The second slide rail 63 extends along the direction from the sleeve 3 to the inner wall of the profile 11, and the second top blocks 61 are slidably connected to the second slide rail 63.

[0030] In the initial state, the hinge position between the sleeve 3 and the second support rod 62 is lower than the hinge position between the core rod 4 and the first support rod 52, thus giving the second support rod 62 a larger tilt angle in the initial position. After being supported, it can achieve a greater jacking distance. The second support rod 62 has a larger stroke than the first support rod 52, which is beneficial for achieving the misalignment relationship between the first jacking block 51 and the second jacking block 61 and avoiding mutual interference.

[0031] The first motor 44 and the second motor 35 are preferably servo motors. The first support rod 52 and the second support rod 62 can be a single rod or several rods. If a top block is connected to multiple support rods, the support rods can be arranged in parallel to form a parallelogram structure. During the top support process, there are more force application points and the top support force is more evenly applied.

[0032] The present invention also provides a method for asynchronous multi-core expansion support of profiles, which uses the above-mentioned asynchronous multi-core expansion support device for profiles and includes the following steps: The first driving device drives multiple first top blocks 51 to push towards the inner wall of the profile 11 simultaneously; The second drive device drives multiple second top blocks 61 to push towards the inner wall of the profile 11 simultaneously; Obtain the required support distance for the first top block 51 and the second top block 61; Based on the required support distance of the first top block 51 and the second top block 61, the jacking speed of the first top block 51 and the second top block 61 is adjusted accordingly, so that multiple first top blocks 51 and multiple second top blocks 61 simultaneously jacke to the inner wall of the support profile 11 and cover the entire cross section of the inner wall of the support profile 11. During the jacking process before contacting the inner wall of the profile 11, the first top block 51 and the second top block 61 always maintain a staggered relationship to avoid interference.

[0033] Furthermore, the method to achieve non-interference in the jacking process is as follows: the required jacking distances of the first jacking block 51 and the second jacking block 61 are d1 and d2, respectively, and the jacking speeds of the first jacking block 51 and the second jacking block 61 are V1 and V2, respectively. The control device controls the jacking speeds of the first jacking block 51 and the second jacking block 61 to satisfy: V1 / V2=d1 / d2.

[0034] The present invention also provides a welding apparatus, including a welding torch and the above-mentioned asynchronous multi-core expansion support device for profiles; the asynchronous multi-core expansion support device for profiles is used to support and cover the entire cross-section of the inner wall of the profile 11; the welding torch is located on one side of the asynchronous multi-core expansion support device for welding the edge of the profile 11 after support.

[0035] Since the cross-sectional shape of the profile 11 cylinder can accurately meet the welding requirements after the asynchronous multi-core expansion top support device is used to support and cover the entire cross-section of the inner wall of the profile 11, the welding sealing performance is improved.

[0036] Example 1: An asynchronous multi-core expansion support device for an aluminum alloy battery box is mounted on a frame. The frame includes an upper platform 21, a lower platform 22, and a lower mounting bracket 23 arranged sequentially from top to bottom.

[0037] like Figure 1 , Figure 2 As shown, the profile 11 has a rectangular cross-section with rounded corners. Four first top blocks 51 and four second top blocks 61 are installed inside the cylindrical cavity of the profile 11. The four first top blocks 51 face the four rounded corners of the rectangle, and the four second top blocks 61 face the four right-angled sides of the rectangle. The supporting surface of each top block is appropriately shaped according to the workpiece part it supports. The first top blocks 51 and second top blocks 61 are arranged alternately, and the sides of both the first top blocks 51 and second top blocks 61 taper linearly from the front end to the rear end to avoid interference between adjacent sides.

[0038] like Figure 3 , Figure 6 As shown, the first top block 51 and the second top block 61 are slidably mounted on the first slide rail 53 and the second slide rail 63, respectively. The bottom surfaces of the first slide rail 53 and the second slide rail 63 are mounted on the upper platform 21. Each top block slides forward and backward through its corresponding slide rail, while limiting its displacement in other directions.

[0039] The inner end faces of the first top block 51 and the second top block 61 are respectively hinged to one end of the first support rod 52 and the second support rod 62, and the other ends of the first support rod 52 and the second support rod 62 are respectively hinged to the core rod 4 and the sleeve 3; the core rod 4 is sleeved and installed on the sleeve 3, and the sleeve 3 passes through the core hole of the upper platform 21, the core hole of the lower platform 22 and the core hole of the lower mounting bracket 23 from top to bottom; the sleeve 3 and the core rod 4 are driven to move up and down by independent first driving device and second driving device respectively.

[0040] like Figure 11 As shown, the lower part of the core rod 4 is provided with a first lead screw part 41 and protrudes from the lower end face of the sleeve 3. The first lead screw part 41 is sleeved and meshes with the internal thread of the first gear screw block 42. The upper and lower end faces of the first lead screw part 41 are connected to the lower mounting bracket 23 through ball bearings. The outer circular surface of the first gear screw block 42 is toothed and is powered by the first motor 44 through the first transmission box 43.

[0041] like Figure 10 As shown, a second lead screw 32 is provided at the lower part of the sleeve 3. The second lead screw 32 is sleeved and meshes with the internal thread of the second gear block 33. The upper and lower end faces of the second gear block 33 are connected to the upper platform 21 through balls. The outer circular surface of the second gear block 33 is toothed and is powered by the second motor 35 through the second transmission box 34.

[0042] The output shafts of the first motor 44 and the second motor 35 transmit power to the corresponding gears in their respective transmission boxes, driving the gear blocks to rotate horizontally. Both the upper and lower end faces of the gear blocks have ball grooves containing balls. The gear blocks are connected to the upper and lower frames via these balls, ensuring proper mounting and positioning while significantly reducing frictional resistance during rotation. The threaded core of the gear block drives the sleeve 3 or the core rod 4 to move vertically up and down. The support rods hinged to the sleeve 3 and core rod 4 change angles through this vertical movement, thereby pushing the corresponding top blocks to move.

[0043] The upper part of the sleeve 3 is a slotted part 31, and the position and number of slots in the slotted part 31 are matched with the first support rod 52 on the core rod 4.

[0044] Several vertical inner positioning keys 37 are provided on the inner surface of the sleeve 3, and matching positioning grooves are provided at corresponding positions on the core rod 4. Each inner positioning key 37 slides up and down within the corresponding positioning groove on the core rod 4, ensuring that the relative position between the core rod 4 and the sleeve 3 does not rotate. Several vertical outer positioning keys 38 are provided on the outer surface of the sleeve 3, and matching positioning grooves are provided at the core hole of the upper platform 21. Each outer positioning key 38 slides up and down within the corresponding positioning groove on the upper platform 21, ensuring that the relative position between the sleeve 3 and the frame does not rotate. This ensures that the force of the top support does not deflect, which is beneficial to improving the top support accuracy of each top block.

[0045] like Figure 5 , Figure 8 As shown, a first guide sleeve 45 is provided at the core hole of the upper platform 21, and a second guide sleeve 36 is provided at the core hole of the lower mounting bracket 23, which are used to assist in guiding the vertical movement trajectory of the sleeve 3 and the core rod 4.

[0046] Both the outer ends of the first top block 51 and the second top block 61 are provided with distance measuring sensors to measure the distance between the first top block 51 or the second top block 61 and the inner wall of the profile 11. Preferably, the sensors are laser distance measuring sensors.

[0047] like Figure 14 As shown, the lifting height h1 of the lower hinge point of the first strut 52 is calculated using the following formula: ; Wherein, H1 is the vertical height difference between the lower hinge point and the upper hinge point of the first support rod 52 when the core rod 4 is in the low position, which is measured in advance; S1 is the length between the two hinge points of the first support rod 52, which is measured in advance; D1 is the horizontal position difference between the lower hinge point and the upper hinge point of the first support rod 52, which is measured in advance; d1 is the distance between the first top block 51 and the inner wall of the profile 11, which is read by the laser rangefinder.

[0048] When H1 is measured to be 80mm, S1 to be 100mm, D1 to be 60mm, and d1 to be 20mm, if the first top block 51 needs to move and contact the inner wall of the profile 11, the lifting height h1 of the lower hinge point of the first support rod 52 should be calculated to be 20mm. This height can then be converted into the number of rotations of the first motor 44 through the encoder calculation.

[0049] If the inner wall of the first top block 51 supporting the profile 11 needs to exceed the contact value by 5mm, that is, d1 should be 25mm, then the lifting height h1 of the first support rod 52 should be calculated to be 27.32mm, and then converted into the number of rotations of the first motor 44 through the encoder calculation.

[0050] ; Similarly, the lifting height h2 of the lower hinge point of the second strut 62 is calculated using the following formula: Wherein, H2 is the vertical height difference between the lower hinge point and the upper hinge point of the second support rod 62 when the sleeve 3 is in the low position, which is measured in advance; S2 is the length between the two hinge points of the second support rod 62, which is measured in advance; D2 is the horizontal position difference between the lower hinge point and the upper hinge point of the second support rod 62, which is measured in advance; d2 is the distance between the second top block 61 and the inner wall of the profile 11, which is read by the laser rangefinder.

[0051] If H2 is measured to be 120mm, S2 to be 150mm, D2 to be 90mm, and d2 to be 50mm, then if the second top block 61 needs to contact the inner wall of the profile 11, the lifting height h2 of the second support rod 62 should be calculated to be 66.1mm. This height can then be converted into the number of rotations of the second motor 35 through the encoder calculation.

[0052] If the inner wall of the second top block 61 supporting the profile 11 needs to exceed the contact value by 5mm, that is, d2 should be 55mm, then the lifting height h1 of the second support rod 62 should be calculated to be 81.6mm, and then converted into the number of rotations of the second motor 35 through the encoder calculation.

[0053] Let the jacking speed of the first top block 51 be V1; and the jacking speed of the second top block 61 be V2; then the ratio of V1 / V2 must satisfy the following equation: V1 / V2=d1 / d2; In this embodiment, d1 is read as 20mm by the laser rangefinder and d2 is read as 50mm by the laser rangefinder. The value of V1 / V2 is calculated to be 2:5, so that the first top block 51 and the second top block 61 can simultaneously support the inner wall of the profile 11.

[0054] The welding method includes the following steps: S1. Place the profile 11 on the upper platform 21 and fit it into the support device, which includes multiple first top blocks 51 and multiple second top blocks 61. In the initial state, the first top blocks 51 and the second top blocks 61 are both in the inward state, and the first top blocks 51 and the second top blocks 61 are staggered. The first top blocks 51 are closer to the inner wall of the profile 11 than the second top blocks 61. S2. Start the first motor 44 and the second motor 35. The first top block 51 and the second top block 61 begin to advance. During the advancing process, the advancing speed of the first top block 51 and the second top block 61 is controlled to maintain the misalignment between them. The advancing speed of the second top block 61 is greater than that of the first top block 51. At the last moment of the advancing process, the second top block 61 catches up with the first top block 51. The first top block 51 and the second top block 61 simultaneously contact and support the entire cross section of the inner wall of the profile 11. S3, place the end cap 12 on top of the profile 11, and the welding robot's welding gun begins to weld the edge; S4. The first top block 51 and the second top block 61 retract simultaneously, with the second top block 61 retracting faster, so that it can maintain the misalignment relationship with the first top block 51 during the retraction process. S5. After the first top block 51 and the second top block 61 retract to their initial positions, the welded profile 11 workpiece is taken out.

[0055] Example 2: The difference from Example 1 is that, as Figure 12 , Figure 13 As shown, the profile 11 has a circular cross-section. Three first top blocks 51 and three second top blocks 61 are evenly arranged inside the profile 11, with the first top blocks 51 and the second top blocks 61 arranged at intervals. The sides of the first top blocks 51 and the second top blocks 61 gradually narrow from the front end to the rear end in an arc shape to avoid interference between the first top blocks 51 and the second top blocks 61 on adjacent sides.

[0056] This invention exhibits significant synergistic effects, specifically manifested in the following ways: by staggering the initial positions of the first top block 51 and the second top block 61, and combining this with a control device to independently adjust the jacking speed according to their respective support distances, the two sets of top blocks maintain staggered positioning throughout the jacking process, avoiding interference, and ultimately simultaneously contacting and covering the entire cross-section of the inner wall of the profile 11. This synergistic mechanism of "staggered initial layout, asynchronous speed control, and synchronous final support" overcomes the problem of insufficient support caused by the use of narrow top blocks in traditional synchronous support to avoid interference, while achieving the comprehensive effects of wide top blocks providing full cross-section coverage, no indentation, and high sealing performance. The structure is simple and the control is precise.

[0057] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A profile asynchronous multi-core expansion support device, characterized in that: It includes multiple first top blocks, multiple second top blocks, a first driving device, a second driving device, and a control device disposed within the profile; The first and second driving devices are both vertically positioned at the center of the profile. Multiple first top blocks are arranged around the first driving device, and multiple second top blocks are arranged around the second driving device. The first and second top blocks are arranged at intervals on the same plane. The initial positions of the first and second top blocks are staggered to avoid interference. The first driving device is connected to a plurality of first top blocks and is used to drive the plurality of first top blocks to push forward simultaneously toward the inner wall of the profile; the second driving device is connected to a plurality of second top blocks and is used to drive the plurality of second top blocks to push forward simultaneously toward the inner wall of the profile. The first and second top blocks are each equipped with a distance measuring sensor to determine the required support distance between the first and second top blocks; The control device is used to adjust the jacking speed of the first and second jacking blocks according to the required jacking distance of the first and second jacking blocks, so that multiple first jacking blocks and multiple second jacking blocks can simultaneously jacking the inner wall of the profile and covering the entire cross section of the inner wall of the profile, and the first and second jacking blocks maintain a staggered relationship during the jacking process before jacking the inner wall of the profile.

2. The asynchronous multi-core expansion support device for profiles according to claim 1, characterized in that: The first driving device includes a core rod, a first motor, and multiple first support rods; the core rod is vertically located at the center of the profile; the first motor is connected to the core rod and is used to drive the core rod to move up and down; the multiple first support rods correspond one-to-one with multiple first top blocks; the two ends of the first support rods are respectively hinged to the first top blocks and the core rod, and are used to convert the up and down movement of the core rod into the horizontal supporting movement of the first top blocks.

3. The asynchronous multi-core expansion support device for profiles according to claim 2, characterized in that: The first drive device also includes a first slide rail, which extends along the direction from the core rod to the inner wall of the profile, and a first top block is slidably connected to the first slide rail.

4. The asynchronous multi-core expansion support device for profiles according to claim 3, characterized in that: The second driving device includes a sleeve, a second motor, and multiple second support rods; the sleeve is sleeved outside the core rod and slidably connected to the core rod; the second motor is connected to the sleeve and is used to drive the sleeve to move up and down; the multiple second support rods correspond one-to-one with multiple second top blocks; the two ends of the second support rods are respectively hinged to the second top blocks and the sleeve, and are used to convert the up and down movement of the sleeve into the horizontal supporting movement of the second top blocks; the hinge position between the sleeve and the second support rods is lower than the hinge position between the core rod and the first support rods.

5. The asynchronous multi-core expansion support device for profiles according to claim 4, characterized in that: The second drive device also includes a second slide rail, which is located on the same plane as the first slide rail. The second slide rail extends along the direction from the sleeve to the inner wall of the profile, and the second top block is slidably connected to the second slide rail.

6. The asynchronous multi-core expansion support device for profiles according to claim 4, characterized in that: The inner surface of the sleeve is provided with multiple vertical inner positioning keys, and the core rod is provided with multiple vertical positioning grooves. The inner positioning keys slide up and down in the positioning grooves. The outer surface of the sleeve is also provided with multiple vertical outer positioning keys for sliding connection with peripheral components.

7. The asynchronous multi-core expansion support device for profiles according to claim 4, characterized in that: The upper part of the sleeve is a slotted part, and the position and number of slots in the slotted part are matched with the first support rod, which extends out from the slotted part.

8. A method for asynchronous multi-core expansion support of profiles, characterized in that: The asynchronous multi-core expansion support device for profiles according to any one of claims 1-7 includes the following steps: The first driving device drives multiple first top blocks to push towards the inner wall of the profile simultaneously; The second drive device drives multiple second push blocks to push towards the inner wall of the profile simultaneously; Obtain the required support distance between the first and second top blocks; Based on the required jacking distance of the first and second jacking blocks, the jacking speed of the first and second jacking blocks is adjusted accordingly, so that multiple first jacking blocks and multiple second jacking blocks simultaneously jacke to the inner wall of the profile and cover the entire cross section of the inner wall of the profile. During the jacking process before jacking the inner wall of the profile, the first and second jacking blocks maintain a staggered relationship.

9. The asynchronous multi-core expansion support method for profiles according to claim 8, characterized in that: The method to maintain the misalignment of the first and second jacking blocks during the jacking process is as follows: the required jacking distances of the first and second jacking blocks are d1 and d2, respectively, and the jacking speeds of the first and second jacking blocks are V1 and V2, respectively. The control device controls the jacking speeds of the first and second jacking blocks to satisfy: V1 / V2=d1 / d2.

10. A welding apparatus, characterized in that, Includes a welding torch and the asynchronous multi-core expansion support device for profiles as described in any one of claims 1-7; The asynchronous multi-core expansion support device for profiles is used to support and cover the entire cross-section of the inner wall of the profile; The welding torch is located on one side of the asynchronous multi-core expansion support device for profiles and is used to weld the edges of the profiles after the support is applied.

Images