A large-span laser welding equipment and its welding process

Abstract

This invention discloses a large-span laser welding equipment and its welding process, relating to the field of welding technology. This large-span laser welding equipment and process, by setting the length of the pressure plate and support to be no less than the length of the workpiece to be welded, can complete the subsequent clamping and bending work of the workpiece, avoiding the problem of deformation and bending of the workpiece after cooling in traditional multi-point clamping and fixing methods. By setting several pressure plates with gaps between adjacent pressure plates, a welding machine can be used to weld along the inner length direction of each second main body part through the gaps. Finally, the welding machine is used to weld along the outer length direction of the outermost second main body part, welding several second main bodies to the first main body part. Multiple second main bodies can be welded, fixed, and bent at once, avoiding the troublesome process of welding each main body part sequentially when welding beam-column structures with multiple main bodies, thus saving time.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and in particular to a large-span laser welding equipment and its welding process. Background Technology

[0002] In recent years, with the continuous development of the economy and the continuous improvement of people's living standards, people's demand for large-span steel structure buildings (such as large stadiums, theaters, exhibition halls, etc.) has also increased. Among them, the construction of these large-span steel structure buildings usually cannot be separated from the erection of large-span beam and column structures.

[0003] Currently, there are the following defects in welding large-span beam-column structures: (1) Currently, when welding large-span beam-column structures, they are clamped and fixed at multiple points before welding. Only multi-point clamping and fixing are performed. During welding, the metal in the weld and the heated area near the weld expands. Since the surrounding cold metal prevents this expansion, compressive stress and plastic shrinkage deformation occur in the welding area, resulting in different degrees of transverse and longitudinal shrinkage. Due to the asymmetry of the longitudinal and transverse shrinkage of the weld relative to the neutral axis of the component, the overall bending of the component is caused. As a result, the large-span beam-column component after cooling is bent into an arch shape, which is not conducive to direct use and requires subsequent correction work, which is relatively troublesome; (2) When welding existing large-span beam-column structures, when there is a first main body and multiple second main bodies, it is necessary to weld the multiple second main bodies to the first main body one by one. Figure 9 The large-span steel pallet beam 9 shown includes a first steel plate 91, a second steel plate 92, and a third steel plate 93. Currently, when welding the second steel plate 92 and the third steel plate 93 onto the first steel plate 91, it is necessary to weld the second steel plate 92 onto the first steel plate 91 first, and then weld the third steel plate 93. The welding process is complex and wastes a lot of time. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention provides a large-span laser welding equipment and its welding process to solve the problems that large-span beam and column components will bend into an arch shape after cooling after welding, and that the welding process is complex and time-consuming when welding beam and column structures with multiple main parts.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a large-span laser welding device, comprising several welding stations and a welding machine, and further comprising:

[0006] A support member is provided on a welding platform to support a workpiece to be welded. The workpiece to be welded is elongated and includes a first main body and a plurality of second main bodies disposed on the first main body. The welding equipment is used to weld the plurality of second main bodies onto the first main body.

[0007] The clamping mechanism includes at least two clamping components, which clamp and fix the first main body and the second main body respectively. Each clamping component includes a first driving member and a pressure plate.

[0008] The length of the pressure plate and the support is not less than the length of the workpiece to be welded. There is a gap between every two adjacent pressure plates. The first driving member drives the pressure plate to move and press the workpiece to be welded onto the support and bends the workpiece to be welded, so that the top and bottom surfaces of the workpiece to be welded are bent downward or upward from the middle position to the surrounding edges, in order to compensate for the amplitude of cooling rebound after the workpiece is welded.

[0009] Preferably, the distance between the highest point of the workpiece after bending and the corresponding point before bending is 1 / 200 to 1 / 100 of the length or width of the workpiece.

[0010] Preferably, a robotic arm is provided on one side of the welding station, the output end of the robotic arm is connected to a welding machine, there are two clamping components, the output shaft of the first drive component is fixedly connected to a slide rail, a pressure plate is fixedly installed at the bottom end of the slide rail, the workpiece to be welded is a steel pallet beam, the first main body includes a first steel plate and a second steel plate welded to the first steel plate, and the second main body is a third steel plate placed on the top surface of the first steel plate and located on one side of the second steel plate.

[0011] Preferably, there is a gap between the two slide rails.

[0012] Preferably, the welding equipment further includes an adjustment mechanism, which includes a third driving member and a support frame. The support frame is provided with a pressing mechanism, and the third driving member drives the support frame to move so that the pressure plate and the support member are misaligned in different vertical planes.

[0013] Preferably, the outer wall of the slide rail near the weld between the first steel plate and the third steel plate is set as an inclined surface.

[0014] Preferably, the welding equipment further includes a clamping mechanism for limiting and fixing the workpiece to be welded on the support.

[0015] A large-span laser welding process, using the aforementioned welding equipment, includes the following steps:

[0016] 1. Place the first main body of the workpiece to be welded on the support, and then place the second main body on the first main body;

[0017] Second: By adjusting the clamping mechanism, the pressure plate is pressed and fixed against the first main body and the second main body and bent so that the top and bottom surfaces of the workpiece to be welded are bent downward or upward from the middle position to the surrounding edges.

[0018] Three: Turn on the welding machine, and move the welding machine by controlling the robotic arm or manually, so that it welds along the length direction of the inner side of each second main body through the gap. Finally, use the welding machine (3) to weld along the length direction of the outermost second main body to weld several second main bodies to the first main body.

[0019] 4. After welding is completed, adjust the clamping mechanism so that the pressure plate no longer presses and fixes the welded workpiece. Take out the welded workpiece and wait for it to cool and spring back into a straight line.

[0020] Preferably, when the workpiece to be welded in step one is a steel pallet beam, when the first main body is a first steel plate and the second main body is a second steel plate and a third steel plate, the first steel plate is placed on the support, and then the second steel plate and the third steel plate are placed on the first steel plate. When the first main body includes a first steel plate and a second steel plate welded to the first steel plate, and the second main body is a third steel plate placed on the top surface of the first steel plate and located on one side of the second steel plate, the welded first steel plate and the second steel plate are placed on the support, and then the third steel plate is placed on the first steel plate.

[0021] Preferably, the clamping mechanism in step two includes two clamping components. By adjusting the two clamping components, the two pressure plates clamp and fix the second steel plate and the third steel plate, and the steel pallet beam to be welded is bent as a whole.

[0022] Compared with the prior art, the beneficial effects that this invention can achieve are:

[0023] 1. This invention, by setting the length of the pressure plate and support to be no less than the length of the workpiece to be welded, can complete the subsequent clamping and bending work of the workpiece to be welded. This avoids the problem of deformation and bending of the workpiece after cooling in traditional multi-point clamping and fixing methods. By setting the support and pressure plate bent into an arch shape, the workpiece to be welded can be clamped and fixed and bent, so that the top and bottom surfaces of the workpiece to be welded are bent downwards or upwards from the center to the surrounding edges. This ensures that the workpiece will cool and spring back into a straight line after welding, compensating for the amplitude of the cooling rebound after the workpiece is welded, and avoiding the problem of deformation and bending of the workpiece after cooling in traditional large-span workpiece welding. It will be arched, which requires further correction and leveling. By setting several pressure plates and creating gaps between adjacent pressure plates, a welding machine can be used to weld along the inner length of each second main body through the gaps. Finally, the welding machine is used to weld along the outer length of the outermost second main body to weld several second main bodies to the first main body. Multiple second main bodies can be welded, fixed and bent at one time, avoiding the complicated welding process of traditional beam and column structures with multiple main bodies, which requires welding each main body in turn, thus saving time.

[0024] Second: This invention is equipped with two clamping components, which can control the first driving component to drive the two pressure plates to clamp and fix the second and third steel plates, and make the top and bottom surfaces of the steel pallet beam bend downward or upward from the middle position to the surrounding edges. By setting a gap between the two adjacent pressure plates, when it is necessary to weld the second and third steel plates on the first steel plate, the laser emitted by the welding machine passes through the gap to bring the second and third steel plates closer to one side, and then welds the outer sides of the second and third steel plates to complete the welding and fixing of the second and third steel plates. Alternatively, when welding the third steel plate on the already welded first and second steel plates, the laser emitted by the welding machine passes through the gap to weld and fix the inner side of the third steel plate to the first steel plate, and then welds the outer side of the third steel plate to the first steel plate to complete the welding of the third steel plate.

[0025] Thirdly, this invention, by setting an adjustment mechanism, adjusts the third driving component to move the support frame when loading the workpiece, so that the pressure plate and the support component are misaligned in different vertical planes, thus ensuring that there is no obstruction above the support component, which facilitates the unloading of the workpiece to be welded onto the support component and the unloading of the workpiece after welding. After placement, the third driving component is adjusted to move and reset the support frame, so that the pressure plate is directly above the workpiece to be welded, which facilitates the subsequent adjustment of the clamping component to clamp and fix the pressure plate on the workpiece to be welded and to perform bending work.

[0026] Fourth: By setting the outer wall of the slide rail near the welding point of the first and third steel plates as an inclined surface, it is easier to weld the first and third steel plates when adjusting the robotic arm to move the welding machine, and avoid the slide rail affecting the welding machine's welding work. Attached Figure Description

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

[0028] Figure 2 This is a schematic diagram of the welding station, support, clamping mechanism, holding mechanism and adjusting mechanism of the present invention.

[0029] Figure 3 This is a schematic diagram of the support platform, support member, clamping mechanism and first limiting block of the present invention;

[0030] Figure 4 This is a schematic diagram of the pressing component, support frame, and second limiting block structure of the present invention;

[0031] Figure 5 This is a schematic diagram of the pressing component, support frame, and second limiting block structure of the present invention;

[0032] Figure 6 This is a schematic diagram of the pressure plate and slide rail structure of the present invention;

[0033] Figure 7This is a schematic diagram of the support structure of the present invention;

[0034] Figure 8 For the present invention Figure 7 Left-view structural diagram;

[0035] Figure 9 This is a schematic diagram of the steel pallet beam structure of the present invention;

[0036] The components include: 1. Welding station; 2. Robotic arm; 3. Welding machine; 4. Support component; 5. Clamping mechanism; 51. Clamping assembly; 511. First driving component; 512. Pressure plate; 513. Slide rail; 6. Clamping mechanism; 61. Backing plate; 62. Second driving component; 63. Clamping plate; 7. Adjustment mechanism; 71. Third driving component; 72. Support frame; 81. First limiting block; 82. Second limiting block; 9. Steel pallet beam; 91. First steel plate; 92. Second steel plate; 93. Third steel plate. Detailed Implementation

[0037] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention is further described below in conjunction with specific embodiments. However, the following embodiments are merely preferred embodiments of this invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of this invention. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods. Unless otherwise specified, the materials and reagents used in the following embodiments can be obtained commercially.

[0038] like Figures 1-9 As shown, the present invention provides a large-span laser welding device, including several welding stations 1 and welding machine 3 (here a laser welding machine 3 is used), and also includes a support member 4 and a clamping mechanism 5;

[0039] The support member 4 is set on the welding station 1 to support the workpiece to be welded. The workpiece to be welded is long and includes a first main body and several second main bodies set on the first main body. The support member 4 is composed of one or more support plates, and its overall top and bottom surfaces are arched along its length and width directions.

[0040] The clamping mechanism 5 includes at least two clamping components 51, which clamp and fix the first main body and the second main body respectively. Each clamping component 51 includes a first driving member 511 (a cylinder can be used here) and a pressure plate 512.

[0041] The length of the pressure plate 512 and the support 4 is not less than the length of the workpiece to be welded. Preferably, the length of the support 4 and the pressure plate 512 is equal to the length of the workpiece to be welded, which can complete the subsequent pressing and bending work of the workpiece to be welded. This avoids the problem of the workpiece being cooled, deformed and bent after welding due to the traditional multi-point pressing and fixing. The width of the support 4 and the pressure plate 512 can be less than or equal to the width of the workpiece to be welded.

[0042] There is a gap between each pair of adjacent pressure plates 512 to facilitate welding of the first main body and the second main body by the welding machine 3. The first driving member 511 drives the pressure plate 512 to move and press and fix the workpiece to be welded on the support member 4 and bend the workpiece to be welded, so that the top and bottom surfaces of the workpiece to be welded are bent downward or upward from the middle position to the surrounding edges. This ensures that the workpiece will cool and spring back into a straight shape after welding, compensating for the amplitude of the cooling rebound of the workpiece after welding. This avoids the trouble of traditional large-span workpieces becoming arched after cooling and needing further correction and flattening.

[0043] This explanation uses a downward bend as an example:

[0044] The distance between the highest point of the workpiece after bending and the corresponding point before bending is 1 / 200 to 1 / 100 of the length or width of the workpiece. Figure 5 The ratio of H1 to the length L1 of the dashed line and such Figure 8 The ratio of H2 to the length of the dashed line L2, that is, when the clamping mechanism 5 is adjusted to make the pressure plate 512 press and fix the workpiece to be welded and bend it, so that the workpiece to be welded is set in an arch shape along its length and width directions, that is, the top and bottom surfaces of the workpiece to be welded are bent downward or upward from its middle position to the surrounding edges.

[0045] as follows Figure 9 The steel pallet beam 9 in the middle has two pressure plates 512. The width of the support 4 and the pressure plate 512 is smaller than the width of the workpiece to be welded. In order to facilitate the welding of the third steel plate 93 to the first steel plate 91 and to the second steel plate 92, and there is a gap between the two pressure plates 512, so as to facilitate the subsequent welding work of the welding machine 3 on the second steel plate 92 and the third steel plate 93 or the second steel plate 92 and the first steel plate 91;

[0046] A large-span laser welding process, using the aforementioned welding equipment, includes the following steps:

[0047] 1. Place the first main body of the workpiece to be welded on the support 4, and then place the second main body on the first main body;

[0048] Second: By adjusting the clamping mechanism 5, the pressure plate 512 is pressed and fixed against the first main body and the second main body and bent so that the top and bottom surfaces of the workpiece to be welded are bent downward or upward from the middle position to the surrounding edges.

[0049] 3. Turn on the welding machine 3, and move the welding machine 3 by controlling the robotic arm 2 or manually, so that it welds along the length of the inner side of each second main body part through the gap. Finally, use the welding machine 3 to weld along the length of the outermost second main body part to weld several second main bodies to the first main body part.

[0050] The definitions of the inner and outer sides of the aforementioned second main body are explained as follows: Figure 9 As shown, when the first main body is a first steel plate 91 and the second main body is a second steel plate 92 and a third steel plate 93, the inner side of the second main body is the side where the second steel plate 92 and the third steel plate 93 are close to each other, and the outer side of the second main body is the side where the second steel plate 92 and the third steel plate 93 are far apart from each other. When more second steel plates 92 and / or third steel plates 93 are arranged along the width direction of the first steel plate 91, the two sides of the second steel plates 92 and / or third steel plates 93 that are farthest apart along the width direction on the first steel plate 91 are the outer side. The same applies to the arrangement of second steel plates 92 and / or third steel plates 93 along the length direction of the first steel plate 91, which will not be elaborated on here.

[0051] When the second main body is a third steel plate 93 and the first main body is a first steel plate 91 and a second steel plate 92, the inner side of the second main body is the side of the third steel plate 93 that is closer to the second steel plate 92, and the outer side of the second main body is the side of the third steel plate 93 that is farther away from the second steel plate 92. Similarly, when more third steel plates 93 are arranged along the width direction of the first steel plate 91, the side of the third steel plate 93 that is farthest from the second steel plate 92 is the outer side.

[0052] Fourth: After welding is completed, adjust the clamping mechanism 5 so that the pressure plate 512 no longer clamps and fixes the welded workpiece. Take out the welded workpiece and wait for it to cool and spring back into a straight line. This compensates for the springback of the workpiece after welding and avoids the trouble of traditional large-span workpieces bending into an arch shape after welding and cooling, which requires further correction and flattening.

[0053] like Figures 4-8 As shown, the bottom surface of the pressure plate 512 and the top surface of the support 4 are both bent downwards or upwards from their middle positions to the surrounding edges. That is, the bottom surface of the pressure plate 512 and the top surface of the support 4 are both set as imitation edges to be adapted to the bending of the workpiece after welding and cooling. Here, the imitation edge is defined as the degree of matching between the surface curvature of the workpiece to be welded and the degree of arching after welding and cooling. This makes the workpiece to be welded bend into an arch shape before welding, so that it springs back into a horizontal straight state after cooling. This avoids the trouble of traditional large-span workpieces being bent after welding and cooling, which requires further correction and flattening.

[0054] like Figures 2-9As shown, taking two clamping components 51 as an example, a robotic arm 2 is provided on one side of the welding station 1. The output end of the robotic arm 2 is connected to the welding machine 3. The output shaft of the first drive component 511 is fixedly connected to the slide rail 513. The bottom end of the slide rail 513 is fixedly installed with a pressure plate 512. The workpiece to be welded is a steel pallet beam 9. The first main body and the second main body include the following two situations: that is, the first main body includes a first steel plate 91 and a second steel plate 92 welded to the first steel plate 91, and the second main body is placed on the first steel plate 91. The third steel plate 93 is located on the top surface of plate 91 and on one side of the second steel plate 92. The welded first steel plate 91 and second steel plate 92 are placed on the support member 4, and then the third steel plate 93 is placed on the first steel plate 91. Alternatively, the first main body can also be the first steel plate 91, and the second main body includes the second steel plate 92 and the third steel plate 93 to be welded placed on the first steel plate 91. The first steel plate 91 is placed on the support member 4, and then the second steel plate 92 and the third steel plate 93 are placed on the first steel plate 91.

[0055] There is a gap between the two slide rails 513, which facilitates the welding machine 3 to perform welding work between the third steel plate 93 and the second steel plate 92 and the first steel plate 91 through the gap;

[0056] This example uses two welding stations 1 and a steel pallet beam 9 as the workpiece to be welded. The first steel plate 91 has two protrusions, a second steel plate 92 and a third steel plate 93. When the welding machine 3 is controlled by the robotic arm 2 to perform welding work, one welding station 1 can be used for loading and the other welding station 1 can be used for unloading, avoiding the waiting time of changing the workpiece to be welded when using a single welding station 1 and improving welding efficiency.

[0057] Before welding, the first steel plate 91 is placed on the support 4, then the second steel plate 92 and the third steel plate 93 are placed on the first steel plate 91. The first steel plate 91, the second steel plate 92, and the third steel plate 93 are then pressed, fixed, and bent using the clamping assembly 51 (the first main body can also be the first steel plate 91, and the second main body includes the second steel plate 92 and the third steel plate 93 to be welded, placed on the first steel plate 91). Alternatively, the first steel plate 91 and the second steel plate 92 can be considered as a single unit (i.e., the first steel plate 91 and the second...). The steel plate 92 has been welded. At this point, the first main body is defined as including the first steel plate 91 and the second steel plate 92 welded to the first steel plate 91. The second main body is a third steel plate 93 placed on the top surface of the first steel plate 91 and located on one side of the second steel plate 92. The whole is L-shaped when viewed from the side. Then, the third steel plate 93 is welded on the above basis using the same equipment. In both cases, the clamping mechanism 5 includes two clamping components 51 (that is, the same applies to the case where several second steel plates 92 or third steel plates 93 are welded on the first steel plate 91).

[0058] First, place the unwelded first steel plate 91 on the support 4, then place the second steel plate 92 on the support 4, or place the welded first steel plate 91 and the second steel plate 92 together, and then place the third steel plate 93 on the first steel plate 91.

[0059] Then, by adjusting the two clamping components 51, the two pressure plates 512 are used to clamp and fix the second steel plate 92 and the third steel plate 93 and bend them, so that the steel pallet beam 9 is bent into an arch shape as a whole.

[0060] Then, the welding machine 3 is turned on, and the robotic arm 2 is controlled to move the welding machine 3 (avoiding the trouble of manually driving the welding machine 3 to weld), and welding is performed on both sides of the second steel plate 92 and both sides of the third steel plate 93, that is, welding the second steel plate 92 and the third steel plate 93 to the first steel plate 91, or welding the second steel plate 92 and the third steel plate 93 and the third steel plate 93 to the first steel plate 91.

[0061] Finally, after welding is completed, adjust the two clamping components 51 so that the two pressure plates 512 no longer press and fix the second steel plate 92 and the third steel plate 93. Take out the welded steel pallet beam 9 and wait for it to cool and spring back into a straight shape. This compensates for the springback of the steel pallet beam 9 after welding and avoids the trouble of traditional large-span workpieces becoming arched after welding and cooling, which requires further correction and flattening.

[0062] Alternatively, the first main body can also be a first steel plate 91, and the second main body, including a second steel plate 92 and a third steel plate 93 placed on the first steel plate 91, can also be welded using the same equipment.

[0063] It should be noted that this equipment can also be used when welding a second steel plate 92 or a third steel plate 93 with a cross-sectional size smaller than the top surface of the first steel plate 91 onto the first steel plate 91. In this case, one of the two pressure plates 512 presses and bends the side of the first steel plate 91 where the second steel plate 92 or the third steel plate 93 is not placed, while the other presses and bends the second steel plate 92 or the third steel plate 93. This can also achieve the welding and fixing of the second steel plate 92 or the third steel plate 93 onto the first steel plate 91, and at the same time ensure that the welded workpiece can cool and spring back into a straight shape. Compared with the traditional method of using only one pressure plate 512 to press and weld the second steel plate 92 or the third steel plate 93, this method can achieve a good welding effect and at the same time prevent the traditional workpiece from cooling and springing back during welding.

[0064] By using two pressure plates 512 to press down in sections, the stability of large workpieces during welding is ensured. Here, two pressure plates 512 are used as an example. In practice, the appropriate number of pressure plates 512 can be selected according to the needs. The overall process and equipment can effectively achieve large-span laser welding.

[0065] In addition, the pressure plate 512 and the slide rail 513 are detachably connected, and the support 4 and the welding station 1 are also detachably connected. This allows for the installation of pressure plates 512 and support 4 of different shapes as needed, enabling welding of workpieces of different types and lengths, thus broadening the applicability.

[0066] like Figure 2 As shown, the welding equipment also includes an adjustment mechanism 7, which includes a third driving member 71 (a cylinder can be used here) and a support frame 72. The support frame 72 is provided with a pressing mechanism 5. The third driving member 71 drives the support frame 72 to move so that the pressure plate 512 and the support member 4 are misaligned in different vertical planes.

[0067] To facilitate unobstructed loading of workpieces, the third drive component 71 is adjusted to move the support frame 72, causing the pressure plate 512 and the support component 4 to be misaligned in different vertical planes. This ensures that there is no obstruction above the support component 4, facilitating the unloading of the workpiece to be welded onto the support component 4 and the unloading of the workpiece after welding. After placement, the third drive component 71 is adjusted again to move and reset the support frame 72, positioning the pressure plate 512 directly above the workpiece to be welded. This facilitates subsequent adjustment of the clamping assembly 51 to clamp and fix the pressure plate 512 for bending and bending the workpiece to be welded.

[0068] like Figure 4 As shown, the outer wall of the slide rail 513 near the welding point of the first steel plate 91 and the third steel plate 93 is set as an inclined surface, which facilitates better welding of the first steel plate 91 and the third steel plate 93 when the robotic arm 2 moves the welding machine 3, and avoids the slide rail 513 affecting the welding work of the welding machine 3.

[0069] like Figure 2 and Figure 3 As shown, the welding equipment also includes a clamping mechanism 6, which limits and fixes the workpiece to be welded on the support member 4. Specifically, the clamping mechanism 6 includes several abutment plates 61 located on one side of the support member 4 and on the welding station 1, a second driving member 62 (a cylinder can be used here) located on the other side of the support member 4, and a clamping plate 63 fixedly connected to the output shaft of the second driving member 62.

[0070] After placing the workpiece to be welded on the support 4, one side of the workpiece to be welded is brought into contact with the abutment 61. Then, the second drive member 62 is driven to move the clamping plate 63, so that the clamping plate 63 and the abutment 61 clamp and fix the workpiece to be welded, which facilitates the subsequent pressure plate 512 to perform stable pressing and bending work on the workpiece to be welded. The pressure plate 512 does not contact the abutment 61 and the clamping plate 63.

[0071] Alternatively, several second driving components 62 can be symmetrically arranged on both sides of the support component 4, and clamping plates 63 can be fixedly installed at the output ends of the second driving components 62 to limit and fix the workpiece to be welded on the support component 4.

[0072] like Figures 3-5 As shown, the welding station 1 is provided with a number of first limiting blocks 81, and each slide rail 513 is provided with second limiting blocks 82 on both sides of the bottom end. When the first driving member 511 is driven to drive the pressure plate 512 to press, fix and bend the workpiece to be welded, the first limiting block 81 and the second limiting block 82 come into contact, thereby preventing the workpiece to be welded from being bent excessively.

[0073] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A large-span laser welding device, comprising a welding station (1) and a welding machine (3), characterized in that, Also includes: Support (4) is provided on welding station (1) for supporting workpiece to be welded. The workpiece to be welded is long and includes a first main body and a number of second main bodies provided on the first main body. The welding equipment is used to weld the number of second main bodies to the first main body. The distance between the highest point of the workpiece after bending and the corresponding point before bending is 1 / 200-1 / 100 of the length or width of the workpiece. The clamping mechanism (5) includes at least two clamping components (51) for clamping and fixing the first main body and the second main body respectively. Each clamping component (51) includes a first driving member (511) and a pressure plate (512). The welding station (1) is provided with a robotic arm (2) on one side. The output end of the robotic arm (2) is connected to the welding machine (3). There are two clamping components (51). The output shaft of the first driving component (511) is fixedly connected to the slide rail (513). The bottom end of the slide rail (513) is fixedly installed with a pressure plate (512). The workpiece to be welded is a steel pallet beam (9). The first main body includes a first steel plate (91) and a second steel plate (92) welded to the first steel plate (91). The second main body is a third steel plate (93) placed on the top surface of the first steel plate (91) and located on one side of the second steel plate (92). There is a gap between the two slide rails (513). The length of the pressure plate (512) and the support member (4) is not less than the length of the workpiece to be welded. There is a gap between every two adjacent pressure plates (512). The first driving member (511) drives the pressure plate (512) to move and press the workpiece to be welded onto the support member (4) and bend the workpiece to be welded so that the top and bottom surfaces of the workpiece to be welded are bent downward or upward from the middle position to the surrounding edges, in order to compensate for the amplitude of cooling rebound after the workpiece is welded.

2. The large-span laser welding equipment according to claim 1, characterized in that: The welding equipment also includes an adjustment mechanism (7), which includes a third driving member (71) and a support frame (72). The support frame (72) is provided with a pressing mechanism (5). The third driving member (71) drives the support frame (72) to move so that the pressure plate (512) and the support member (4) are misaligned in different vertical planes.

3. The large-span laser welding equipment according to claim 1, characterized in that: The outer wall of the slide rail (513) near the weld between the first steel plate (91) and the third steel plate (93) is set as an inclined surface.

4. The large-span laser welding equipment according to claim 1, characterized in that: The welding equipment also includes a clamping mechanism (6) for limiting and fixing the workpiece to be welded on the support (4).

5. A large-span laser welding process, employing the welding equipment described in any one of claims 1-4, characterized in that: Includes the following steps:

1. Place the first main body of the workpiece to be welded on the support (4), and then place several second main bodies on the first main body; Second: By adjusting the clamping mechanism (5), the pressure plate (512) is clamped and fixed to the first main body and several second main bodies and bent so that the top and bottom surfaces of the workpiece to be welded are bent downward or upward from the middle position to the surrounding edges. Three: Turn on the welding machine (3), and move the welding machine (3) by controlling the robotic arm (2) or manually, so that it welds along the length direction of the inner side of each second main body through the gap. Finally, use the welding machine (3) to weld along the length direction of the outermost second main body to weld several second main bodies to the first main body.

4. After welding is completed, adjust the clamping mechanism (5) so that the pressure plate (512) no longer clamps and fixes the welded workpiece. Take out the welded workpiece and wait for it to cool and spring back into a straight line.

6. The large-span laser welding process according to claim 5, characterized in that: When the workpiece to be welded in step one is a steel pallet beam (9), when the first main body is a first steel plate (91), the second main body is a second steel plate (92) and a third steel plate (93), the first steel plate (91) is placed on the support (4), and then the second steel plate (92) and the third steel plate (93) are placed on the first steel plate (91). When the first main body includes a first steel plate (91) and a second steel plate (92) welded to the first steel plate (91), and the second main body is a third steel plate (93) placed on the top surface of the first steel plate (91) and located on one side of the second steel plate (92), the welded first steel plate (91) and the second steel plate (92) are placed on the support (4), and then the third steel plate (93) is placed on the first steel plate (91).

7. The large-span laser welding process according to claim 6, characterized in that: In step two, the clamping mechanism (5) includes two clamping components (51). By adjusting the two clamping components (51), the two pressure plates (512) clamp and fix the second steel plate (92) and the third steel plate (93) and make the steel pallet beam (9) to be welded bend as a whole.

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