Sandwich plate laser welding clamp

Abstract

The invention discloses a sandwich plate laser welding clamp, and relates to the technical field of laser welding equipment, the sandwich plate laser welding clamp comprises a supporting table, a frame is fixedly mounted at the top of the supporting table, a motor is fixedly mounted at the top of the frame, a rotary table is rotatably mounted at the top of the supporting table, and a fixing block is slidably mounted at the top of the rotary table; a welding head is slidably mounted at the top of the supporting table, an electric push rod is fixedly mounted at the output end of the motor, a pressing plate is fixedly mounted at the bottom of the electric push rod, a fixing block is slidably mounted at the bottom of the pressing plate, and a protection device is further arranged at the top of the supporting table. When the pressing plate is pressed to a certain degree, the outer rod can make contact with the supporting table to support the pressing plate, and the situation that the pressing plate excessively presses the plate, excessive mechanical stress is possibly generated on the local portion of the sandwich plate due to excessive pressing of the plate, especially around a welding area, the stress possibly causes local deformation of the plate, and the quality of a welding joint is affected is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of laser welding equipment, and particularly to a sandwich panel laser welding fixture. Background Art

[0002] The sandwich structure, especially the metal sandwich panel made by laser welding, has excellent properties such as high specific strength, good impact resistance, corrosion prevention, heat insulation, sound insulation and radiation protection, and thus has been widely used in practice.

[0003] The patent with the patent publication number CN206140043U relates to the technical field of sandwich panel laser welding fixtures, including a frame, a base, a pressing plate and a pneumatic cylinder. Two mutually parallel guide rails are arranged on the frame. Rollers matching with the guide rails are arranged on the bottom surface of the base. The base is slidably arranged on the frame. The pressing plate is arranged above the base. A workpiece to be welded is placed between the pressing plate and the base. The pneumatic cylinder is arranged on the side wall of the base. Among them, the output end of the pneumatic cylinder penetrates upward from the lower part of the side wall of the base. This patent relates to the technical field of laser welding, and provides a sandwich panel laser welding fixture, which is easy to operate, enables the gap between the sandwich structures of the welded parts to meet the process requirements of laser welding, has good pressing welding quality, and is suitable for laser welding fixtures for thinner sandwich panels.

[0004] The above patent is easy to operate, enables the gap between the sandwich structures of the welded parts to meet the process requirements of laser welding, has good pressing welding quality, and is suitable for laser welding fixtures for thinner sandwich panels. However, during the process of pressing two plate pieces, the plate pieces may be over-pressed, and over-clamping of the fixture may cause too large a contact area between the plates, thereby affecting the uniform conduction of heat and resulting in uneven heat distribution in the welding area. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a sandwich panel laser welding fixture, which solves the problems raised in the above background art.

[0006] To achieve the above purposes, the present invention is realized through the following technical solutions: A sandwich panel laser welding fixture, including a support table, a frame is fixedly installed on the top of the support table, a motor is fixedly installed on the top of the frame, a turntable is rotatably installed on the top of the support table, a fixed block is slidably installed on the top of the turntable, a welding head is slidably installed on the top of the support table, the output end of the motor is fixedly installed with an electric push rod, a pressing plate is fixedly installed at the bottom of the electric push rod, a fixed block is slidably installed at the bottom of the pressing plate, and a protection device is further provided on the top of the support table; The protection device includes an inner rod, an outer rod, a slider, a push plate and an inclined block. The outer rod is rotatably installed on the inner wall of the pressure plate, the inner rod is slidably installed on the inner wall of the outer rod, the slider is slidably installed at the bottom of the pressure plate, a square groove is formed in the outer wall of the outer rod, the push plate is fixedly installed on one side of the inner rod close to the square groove, the push plate is in contact with the inner wall of the square groove, and the inclined block is fixedly installed on one side of the push plate close to the slider. When the pressure plate is pressed to a certain extent, the outer rod will contact the support platform to support the pressure plate, preventing the pressure plate from pressing the plate member excessively. Excessive pressing of the plate member may cause excessive mechanical stress in a local area of the sandwich panel, especially around the welding area. These stresses may cause local deformation of the plate, affecting the quality of the welded joint.

[0007] According to the above technical solution, the protection device further includes a rotating plate, a limiting block and a fixing plate. The rotating plate is rotatably installed on the top of the rotating table, the limiting block is slidably installed on the inner wall of the rotating table, the fixing plate is fixedly installed on the top of the support platform, a limiting groove is formed on one side of the fixing plate close to the limiting block, and the limiting block is in contact with the inner wall of the limiting groove. Only after the inner rod is completely retracted into the outer rod can the outer rod rotate to contact the support platform for support, preventing the pressure plate from not pressing the plate member tightly enough. When the plate member is welded, it may shift, and the shift of the plate member will cause the welding position to be inaccurate, which will affect the position and quality of the welded joint.

[0008] According to the above technical solution, a first spring is provided between the inner rod and the outer rod to drive the inner rod back to its original position. A second spring is provided between the limiting block and the rotating table to drive the limiting block back to its original position. A third spring is provided between the slider and the pressure plate to drive the slider back to its original position. A fourth spring is provided between the welding head and the support platform to drive the welding head back to its original position.

[0009] According to the above technical solution, a first torsion spring is provided between the rotating plate and the rotating table to drive the rotating plate back to its original position. A second torsion spring is provided between the outer rod and the pressure plate to drive the outer rod back to its original position. The side of the slider close to the push plate is set as an inclined surface to facilitate the push plate to push the slider to move. The side of the limiting block close to the outer rod is set as an inclined surface to facilitate the outer rod to push the limiting block to move.

[0010] According to the above technical solution, a pushing device for pushing the welding head to move to make welding more uniform and a scraping device for preventing oiling of the object after welding are further provided on the top of the support table. The pushing device includes a pushing plate, a pulling plate, a first hydraulic rod, a first hydraulic cylinder, a second hydraulic cylinder, a second hydraulic rod, a baffle, a bottom plate, a pushing block, a sliding plate and a square plate. The first hydraulic cylinder is fixedly installed on the top of the pressing plate. The first hydraulic rod is slidably installed on the inner wall of the first hydraulic cylinder. The pulling plate is fixedly installed at the end of the first hydraulic rod away from the first hydraulic cylinder. The pushing plate is fixedly installed on the side of the outer rod close to the pulling plate. The second hydraulic cylinder is fixedly installed on the top of the support table. The second hydraulic rod is slidably installed on the inner wall of the second hydraulic cylinder. The bottom plate is slidably installed on the top of the support table. The baffle is slidably installed on the inner wall of the bottom plate. The pushing block is fixedly installed on the side of the baffle away from the welding head. The sliding plate is slidably installed on the top of the support table. The square plate is slidably installed on the circumferential surface of the rotating shaft of the turntable. When the second hydraulic rod moves, the support for the baffle will be released, and then the baffle will be pulled by the fifth spring to move towards the inside of the bottom plate. When the baffle moves towards the inside of the bottom plate, the blockage of the welding head will be released, and then the welding head can weld the plate. This can avoid welding the plate when the pressing plate does not fully press the plate, which may cause the plate to displace or rotate during the welding process, resulting in inaccurate welding positions, affecting the position and quality of the welding joint, possibly causing uneven seams or misalignment, and even leading to the inability to complete the welding.

[0011] According to the above technical solution, the first hydraulic cylinder and the second hydraulic cylinder are connected by a hose. A fifth spring is provided between the baffle and the bottom plate. The fifth spring is provided to drive the baffle to slide towards the inside of the bottom plate. A sixth spring is provided between the pulling plate and the pressing plate. The sixth spring is provided to drive the pulling plate back to its original position. A seventh spring is provided between the sliding plate and the support table. The seventh spring is provided to drive the sliding plate back to its original position. The baffle contacts the second hydraulic rod, and the bottom plate contacts the welding head.

[0012] According to the above technical solution, the scraping device includes a connecting rod, a rack, a first gear, a second gear, a vertical plate, an oil tank, a rotating push rod, a sleeve rod and a scraper. The vertical plate is slidably mounted on the top of the support platform, the connecting rod is fixedly mounted on the side of the bottom plate close to the vertical plate, the rack is fixedly mounted on the side of the connecting rod close to the vertical plate, the first gear is rotatably mounted on the top of the support platform, the second gear is rotatably mounted on the side of the vertical plate close to the first gear, the oil tank is fixedly mounted on the side of the vertical plate close to the first gear, and the rotating push rod is rotatably mounted on the vertical plate away from the first gear. On one side of the No. 1 gear, the sleeve rod is slidably installed on the circumferential surface of the rotating push rod, and the scraper rotates on the side of the sleeve rod away from the vertical plate. When the motor drives the plate to rotate, the sleeve rod will push the sleeve rod to slide in the direction of the vertical plate due to the shape of the plate. The rotating push rod will squeeze the oil inside the sleeve rod and discharge it through the oil outlet on the scraper surface, scraping the surface of the plate after welding to prevent oxidation of the plate surface, accelerate the cooling speed of the plate, and improve the corrosion resistance and durability of the plate. Oiling can prevent rust and prevent the metal surface from directly contacting moisture in the air.

[0013] According to the above technical solution, the oil tank is connected to the sleeve rod through a telescopic tube, and a No. 1 one-way valve is provided at the position where the sleeve rod is connected to the telescopic tube. The No. 1 one-way valve is provided to allow liquid to flow into the interior of the sleeve rod in one direction. The scraper is connected to the sleeve rod, and a No. 2 one-way valve is provided at the position where the scraper is connected to the sleeve rod. The No. 2 one-way valve is provided to allow liquid to flow out through the scraper in one direction. An oil outlet is provided on the side of the scraper close to the plate. The rotating shaft of the No. 2 gear is connected to the rotating push rod through a belt drive. A No. 8 spring is provided between the sleeve rod and the rotating push rod. The No. 8 spring is provided to drive the sleeve rod back to its original position.

[0014] The present invention provides a sandwich plate laser welding fixture, which has the following beneficial effects: (1) In the present invention, when the pressure plate presses the plate, the inner rod will contact the support platform. The inner rod will slide toward the inside of the outer rod due to the pressure of the pressure plate. When the pressure plate is pressed to a certain extent, the outer rod will contact the support platform to support the pressure plate, so as to avoid excessive pressure of the plate by the pressure plate. Excessive pressure on the plate may cause excessive mechanical stress in the sandwich plate, especially around the welding area. These stresses may cause local deformation of the plate, affecting the quality of the welded joint. When the electric push rod stops applying pressure, it rotates the outer rod to make it disengage from the support platform. The rotation of the outer rod will disengage from the slider, and the slider will be pushed back to its original position by the No. 3 spring. The outer rod will be blocked by the slider, making it unable to rotate back to its original position. Only after the inner rod is completely retracted can the outer rod rotate to contact the support platform to support it, so as to avoid the pressure plate not fully pressing the plate. The plate may be offset during welding. The offset of the plate will cause inaccurate welding position, which will affect the position and quality of the welded joint.

[0015] (2) In this invention, when the second hydraulic rod moves, the support for the baffle will be released, and then the baffle will be pulled by the fifth spring and move towards the inside of the bottom plate. When the baffle moves towards the inside of the bottom plate, the blockage of the welding head will be released, and then the welding head can weld the plate. This avoids welding the plate when the pressing plate does not fully compress the plate, which may cause the plate to displace or rotate during the welding process, resulting in inaccurate welding positions. This will affect the position and quality of the welded joint, may cause uneven seams or misalignment, and even lead to the inability to complete the welding.

[0016] (3) In this invention, when the square plate rotates, it will push the sliding plate to move along the boundary of the square plate. When the sliding plate moves, it will push the push block to move. When the push block moves, it will push the bottom plate to move. When the bottom plate moves, it will push the welding head to move. Then the movement of the welding head can make the distance between the welding head and the plate consistent. This avoids the situation where the welding head does not rotate with the plate during welding, which may cause the irradiation angle and position of the laser to change, resulting in uneven weld seams or incomplete welding.

[0017] (4) In this invention, when the second gear rotates, it will drive the rotating push rod to rotate through the belt. When the rotating push rod rotates, it will drive the sleeve rod to rotate. When the sleeve rod rotates, it will drive the scraper to rotate. When the scraper rotates, it will scrape off the welding slag on the surface after welding. Scraping off the welding slag can remove surface impurities, improve the appearance of the welded joint, and make the weld seam smoother and more even. This helps with subsequent coating treatment, inspection, and assembly, and improves the overall appearance quality of the welded parts.

[0018] (5) In this invention, when the motor drives the plate to rotate, the sleeve rod will be pushed by the shape of the plate and slide towards the vertical plate. Then the rotating push rod will squeeze the oil in the sleeve rod to be discharged through the oil outlet on the surface of the scraper, and scrape the surface of the plate after welding, preventing the surface of the plate from oxidizing, accelerating the cooling rate of the plate, improving the corrosion resistance and durability of the plate. Applying oil can play an anti-rust role and avoid the direct contact of the metal surface with moisture in the air. Brief Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the position structure of the electric push rod and the pressing plate of the present invention; Figure 3 It is a schematic diagram of the position structure of the rotating plate and the limiting block of the present invention; Figure 4 It is a schematic diagram of the position structure of the first hydraulic cylinder and the first hydraulic rod of the present invention; Figure 5 For the present invention Figure 4 The enlarged structure schematic diagram of part A in; Figure 6 It is a schematic diagram of the position structure of the second hydraulic cylinder and the second hydraulic rod of the present invention; Figure 7 Schematic diagram of the positions and structures of the first gear and the second gear of the present invention; Figure 8 Schematic diagram of the positions and structures of the sleeve rod and the rotating push plate of the present invention.

[0020] In the figure: 1, support platform; 2, frame; 3, motor; 4, turntable; 5, welding head; 6, fixed block; 7, pressing plate; 8, electric push rod; 9, inner rod; 10, outer rod; 11, rotating plate; 12, limiting block; 13, fixing plate; 14, slider; 15, push plate; 16, inclined block; 20, pushing plate; 21, pulling plate; 22, first hydraulic rod; 23, first hydraulic cylinder; 24, second hydraulic cylinder; 25, second hydraulic rod; 26, baffle; 27, bottom plate; 28, pushing block; 29, sliding plate; 291, square plate; 30, connecting rod; 31, rack; 32, first gear; 33, second gear; 34, vertical plate; 35, fuel tank; 36, rotating push rod; 37, sleeve rod; 38, scraper. Specific embodiments

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to Figures 1-8 , an embodiment of the present invention is: a sandwich panel laser welding fixture, including a support platform 1, a frame 2 is fixedly installed on the top of the support platform 1, a motor 3 is fixedly installed on the top of the frame 2, a turntable 4 is rotatably installed on the top of the support platform 1, a fixed block 6 is slidably installed on the top of the turntable 4, a welding head 5 is slidably installed on the top of the support platform 1, the output end of the motor 3 is fixedly installed with an electric push rod 8, a pressing plate 7 is fixedly installed at the bottom of the electric push rod 8, a fixed block 6 is slidably installed at the bottom of the pressing plate 7, and a protection device is further provided on the top of the support platform 1; The protection device includes an inner rod 9, an outer rod 10, a slider 14, a push plate 15 and an inclined block 16. The outer rod 10 is rotatably installed on the inner wall of the pressing plate 7, the inner rod 9 is slidably installed on the inner wall of the outer rod 10, the slider 14 is slidably installed at the bottom of the pressing plate 7, a square groove is formed on the outer wall of the outer rod 10, the push plate 15 is fixedly installed on one side of the inner rod 9 close to the square groove, the push plate 15 is in contact with the inner wall of the square groove, the inclined block 16 is fixedly installed on one side of the push plate 15 close to the slider 14. When the pressing plate 7 is pressed to a certain extent, the outer rod 10 will contact the support platform 1 to support the pressing plate 7, avoiding excessive pressing of the pressing plate 7 on the plate member. Excessive pressing of the plate member may cause excessive mechanical stress in a local area of the sandwich panel, especially around the welding area. These stresses may cause local deformation of the plate, affecting the quality of the welding joint.

[0023] The protection device further includes a rotating plate 11, a limiting block 12 and a fixing plate 13. The rotating plate 11 is rotatably installed on the top of the turntable 4, the limiting block 12 is slidably installed on the inner wall of the turntable 4, and the fixing plate 13 is fixedly installed on the top of the support table 1. A limiting groove is formed on one side of the fixing plate 13 close to the limiting block 12, and the limiting block 12 is in contact with the inner wall of the limiting groove. Only after the inner rod 9 is completely retracted into the outer rod 10 can the outer rod 10 rotate to contact and support the support table 1, avoiding the situation that the pressing plate 7 does not completely press the plate member. When the plate member is welded, it may shift, and the shift of the plate member will cause the welding position to be inaccurate, which will affect the position and quality of the welded joint.

[0024] A first spring is provided between the inner rod 9 and the outer rod 10, and the first spring is provided to drive the inner rod 9 back to its original position. A second spring is provided between the limiting block 12 and the turntable 4, and the second spring is provided to drive the limiting block 12 back to its original position. A third spring is provided between the slider 14 and the pressing plate 7, and the third spring is provided to drive the slider 14 back to its original position. A fourth spring is provided between the welding head 5 and the support table 1, and the fourth spring is provided to drive the welding head 5 back to its original position.

[0025] A first torsion spring is provided between the rotating plate 11 and the turntable 4, and the first torsion spring is provided to drive the rotating plate 11 back to its original position. A second torsion spring is provided between the outer rod 10 and the pressing plate 7, and the second torsion spring is provided to drive the outer rod 10 back to its original position. The side of the slider 14 close to the push plate 15 is set as an inclined surface, and the inclined surface is provided to facilitate the push plate 15 to push the slider 14 to move. The side of the limiting block 12 close to the outer rod 10 is set as an inclined surface, and the inclined surface is provided to facilitate the outer rod 10 to push the limiting block 12 to move.

[0026] When this embodiment is working: when two plates need to be welded together, the two plates are first stacked and placed on top of the turntable 4, and then the electric push rod 8 is started to push the pressure plate 7 to move downward to press the plates so that the plates are fitted together, and then the fixing block 6 moves to fix the plates to prevent the plates from offsetting during welding. After the fixing is completed, the motor 3 is started to drive the electric push rod 8 to rotate, and the rotation of the electric push rod 8 will drive the pressure plate 7 to rotate, and the plates will also rotate, then the welding head 5 will weld the boundaries of the two plates. When the pressing plate 7 is pressed down, the outer rod 10 will be driven to move, and the movement of the outer rod 10 will drive the inner rod 9 to move. The movement of the inner rod 9 will contact the inclined surface of the limit block 12, and the inner rod 9 will push the limit block 12 to slide in the direction away from the fixed plate 13, and the limit block 12 will be separated from the fixed plate 13. When the fixed plate 13 is separated from the limit block 12, the limit of the turntable 4 is released. At this time, the motor 3 can drive the plate to rotate. When the pressing plate 7 presses the plate, the inner rod 9 will contact the support table 1, and the inner rod 9 will be pressed by the pressure of the pressing plate 7. When the pressure plate 7 is pressed to a certain extent, the outer rod 10 will contact the support platform 1 to support the pressure plate 7 to prevent the pressure plate 7 from over-pressing the plate. Excessive compression of the plate may cause excessive mechanical stress in the sandwich plate, especially around the welding area. These stresses may cause local deformation of the plate, affecting the quality of the welded joint. When the inner rod 9 moves toward the inside of the outer rod 10, it will drive the push plate 15 to move, and the movement of the push plate 15 will drive the inclined block 16 to move, and the inclined block 16 will move. When the outer rod 10 is rotated, it will be out of contact with the slider 14, and the slider 14 will be pushed back to its original position by the No. 3 spring. Then, the outer rod 10 will be blocked by the slider 14, so that the slider 14 cannot be rotated back to its original position, so as to avoid the outer rod 10 blocking the welding of the plate during welding, resulting in incomplete welding.

[0027] See also Figures 1-8, on the basis of the above embodiments, in another embodiment of the present invention, a pushing device for pushing the welding head 5 to move to make welding more uniform and a scraping device for preventing oiling of the welded object are further provided on the top of the support table 1. The pushing device includes a pushing plate 20, a pulling plate 21, a first hydraulic rod 22, a first hydraulic cylinder 23, a second hydraulic cylinder 24, a second hydraulic rod 25, a baffle 26, a bottom plate 27, a pushing block 28, a sliding plate 29 and a square plate 291. The first hydraulic cylinder 23 is fixedly installed on the top of the pressing plate 7. The first hydraulic rod 22 is slidably installed on the inner wall of the first hydraulic cylinder 23. The pulling plate 21 is fixedly installed at one end of the first hydraulic rod 22 away from the first hydraulic cylinder 23. The pushing plate 20 is fixedly installed on the side of the outer rod 10 close to the pulling plate 21. The second hydraulic cylinder 24 is fixedly installed on the top of the support table 1. The second hydraulic rod 25 is slidably installed on the inner wall of the second hydraulic cylinder 24. The bottom plate 27 is slidably installed on the top of the support table 1. The baffle 26 is slidably installed on the inner wall of the bottom plate 27. The pushing block 28 is fixedly installed on the side of the baffle 26 away from the welding head 5. The sliding plate 29 is slidably installed on the top of the support table 1. The square plate 291 is slidably installed on the circumferential surface of the rotating shaft of the turntable 4. When the second hydraulic rod 25 moves, the support for the baffle 26 will be released, and then the baffle 26 will be pulled by the fifth spring to move into the bottom plate 27. When the baffle 26 moves into the bottom plate 27, the block on the welding head 5 will be released, and then the welding head 5 can weld the plate. This avoids welding the plate when the pressing plate 7 does not press the plate tightly, which may cause the plate to displace or rotate during the welding process, resulting in inaccurate welding positions, affecting the position and quality of the welded joints, possibly causing uneven seams or misalignment, and even leading to the inability to complete the welding.

[0028] The first hydraulic cylinder 23 and the second hydraulic cylinder 24 are connected by a hose. A fifth spring is provided between the baffle 26 and the bottom plate 27 to drive the baffle 26 to slide into the bottom plate 27. A sixth spring is provided between the pulling plate 21 and the pressing plate 7 to drive the pulling plate 21 back to its original position. A seventh spring is provided between the sliding plate 29 and the support table 1 to drive the sliding plate 29 back to its original position. The baffle 26 contacts the second hydraulic rod 25, and the bottom plate 27 contacts the welding head 5.

[0029] The scraping device includes a connecting rod 30, a rack 31, a first gear 32, a second gear 33, a vertical plate 34, an oil tank 35, a rotating push rod 36, a sleeve rod 37 and a scraper 38. The vertical plate 34 is slidably installed on the top of the support table 1. The connecting rod 30 is fixedly installed on one side of the bottom plate 27 close to the vertical plate 34. The rack 31 is fixedly installed on one side of the connecting rod 30 close to the vertical plate 34. The first gear 32 is rotatably installed on the top of the support table 1. The second gear 33 is rotatably installed on one side of the vertical plate 34 close to the first gear 32. The oil tank 35 is fixedly installed on one side of the vertical plate 34 close to the first gear 32. The rotating push rod 36 is rotatably installed on one side of the vertical plate 34 away from the first gear 32. The sleeve rod 37 is slidably installed on the circumferential surface of the rotating push rod 36. The scraper 38 is rotatably installed on one side of the sleeve rod 37 away from the vertical plate 34. When the motor 3 drives the plate member to rotate, the sleeve rod 37 will be pushed to slide towards the vertical plate 34 due to the shape of the plate member. Then the rotating push rod 36 will squeeze the oil liquid inside the sleeve rod 37 to be discharged through the oil outlet on the surface of the scraper, scraping the surface of the plate member after welding, preventing the surface of the plate member from oxidizing, accelerating the cooling speed of the plate member, improving the corrosion resistance and durability of the plate member. Applying oil can play an anti-rust role and avoid the direct contact between the metal surface and the moisture in the air.

[0030] The oil tank 35 is communicated with the sleeve rod 37 through a telescopic pipe. A first one-way valve is provided at the position where the sleeve rod 37 is communicated with the telescopic pipe. The first one-way valve is provided to make the liquid flow into the sleeve rod 37 unidirectionally. The scraper 38 is communicated with the sleeve rod 37. A second one-way valve is provided at the position where the scraper 38 is communicated with the sleeve rod 37. The second one-way valve is provided to make the liquid flow out through the scraper 38 unidirectionally. An oil outlet is opened on one side of the scraper 38 close to the plate member. The rotating shaft of the second gear 33 is connected with the rotating push rod 36 through a belt drive. An eighth spring is provided between the sleeve rod 37 and the rotating push rod 36. The eighth spring is provided to drive the sleeve rod 37 back to its original position.

[0031] During the operation of this embodiment: when the outer rod 10 rotates, it will drive the push plate 20 to move. The movement of the push plate 20 will push the pull plate 21 to move. The movement of the pull plate 21 will pull the first hydraulic rod 22 to move away from the first hydraulic cylinder 23. The movement of the first hydraulic rod 22 will pump the liquid inside the second hydraulic cylinder 24 into the first hydraulic cylinder 23. Then the liquid inside the second hydraulic cylinder 24 will decrease, and the second hydraulic rod 25 will slide back into the second hydraulic cylinder 24. The movement of the second hydraulic rod 25 will release the support for the baffle 26, and then the baffle 26 will be pulled by the fifth spring to move into the bottom plate 27. The movement of the baffle 26 into the bottom plate 27 will release the blockage of the welding head 5, and then the welding head 5 can weld the plate member. When the baffle 26 moves, it will drive the push block 28 to move. The movement of the push block 28 will contact the sliding plate 29. When the motor 3 drives the turntable 4 to rotate, the turntable 4 will drive the square plate 291 to rotate. The rotation of the square plate 291 will push the sliding plate 29 to move along the boundary of the square plate 291. The movement of the sliding plate 29 will push the push block 28 to move. The movement of the push block 28 will push the bottom plate 27 to move. The movement of the bottom plate 27 will push the welding head 5 to move. Then the movement of the welding head 5 can make the distance between the welding head 5 and the plate member consistent, avoiding the situation that when the welding head 5 is welding, the welding head 5 does not rotate with the plate member, and the irradiation angle and position of the laser will change, which may lead to uneven welds or incomplete welding.

[0032] When the bottom plate 27 moves, it will drive the connecting rod 30 to move. The movement of the connecting rod 30 will drive the rack 31 to move. The movement of the rack 31 will drive the first gear 32 meshing with the rack 31 to rotate. The rotation of the first gear 32 will drive the second gear 33 to rotate. The rotation of the second gear 33 will drive the rotating push rod 36 to rotate through the belt. The rotation of the rotating push rod 36 will drive the sleeve rod 37 to rotate. The rotation of the sleeve rod 37 will drive the scraper 38 to rotate. The rotation of the scraper 38 will scrape off the welding slag on the surface after welding. When the motor 3 drives the plate member to rotate, the sleeve rod 37 will be pushed by the shape of the plate member to slide towards the vertical plate 34. Then the rotating push rod 36 will squeeze the oil liquid inside the sleeve rod 37 to be discharged through the oil outlet on the surface of the scraper 38, and scrape the surface of the plate member after welding, preventing the oxidation of the plate member surface and accelerating the cooling speed of the plate member. When the sleeve rod 37 returns to its original position, it will pump the oil liquid inside the fuel tank 35 into the sleeve rod 37, so that there is stored oil liquid in the sleeve rod 37 for the next use.

[0033] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A laser welding fixture for a sandwich panel, comprising a support table (1), characterized in that: A frame (2) is fixedly installed at the top of the support table (1). A motor (3) is fixedly installed at the top of the frame (2). A turntable (4) is rotatably installed at the top of the support table (1). A fixing block (6) is slidably installed at the top of the turntable (4). A welding head (5) is slidably installed at the top of the support table (1). The output end of the motor (3) is fixedly installed with an electric push rod (8). A pressing plate (7) is fixedly installed at the bottom of the electric push rod (8). The fixing block (6) is slidably installed at the bottom of the pressing plate (7). A protection device is further provided at the top of the support table (1). The protection device includes an inner rod (9), an outer rod (10), a slider (14), a push plate (15) and an inclined block (16). The outer rod (10) is rotatably installed on the inner wall of the pressing plate (7). The inner rod (9) is slidably installed on the inner wall of the outer rod (10). The slider (14) is slidably installed at the bottom of the pressing plate (7). A square groove is formed in the outer wall of the outer rod (10). The push plate (15) is fixedly installed on one side of the inner rod (9) close to the square groove. The push plate (15) is in contact with the inner wall of the square groove. The inclined block (16) is fixedly installed on one side of the push plate (15) close to the slider (14). Among them, a pushing device for pushing the welding head (5) to move to make the welding more uniform and a scraping device for avoiding oiling the welded object are further provided at the top of the support table (1).

2. The laser welding fixture for a sandwich panel according to claim 1, wherein: The protection device further includes a rotating plate (11), a limiting block (12) and a fixing plate (13). The rotating plate (11) is rotatably installed at the top of the turntable (4). The limiting block (12) is slidably installed on the inner wall of the turntable (4). The fixing plate (13) is fixedly installed at the top of the support table (1). A limiting groove is formed on one side of the fixing plate (13) close to the limiting block (12). The limiting block (12) is in contact with the inner wall of the limiting groove.

3. The laser welding fixture for a sandwich panel according to claim 2, characterized in that: A first spring is provided between the inner rod (9) and the outer rod (10). A second spring is provided between the limiting block (12) and the turntable (4). A third spring is provided between the slider (14) and the pressing plate (7). A fourth spring is provided between the welding head (5) and the support table (1).

4. The laser welding fixture for a sandwich panel according to claim 3, characterized in that: A first torsion spring is provided between the rotating plate (11) and the turntable (4). A second torsion spring is provided between the outer rod (10) and the pressing plate (7). One side of the slider (14) close to the push plate (15) is provided as an inclined surface. One side of the limiting block (12) close to the outer rod (10) is provided as an inclined surface.

5. The laser welding fixture for a sandwich panel according to claim 4, characterized in that: The pushing device includes a pushing plate (20), a pulling plate (21), a first hydraulic rod (22), a first hydraulic cylinder (23), a second hydraulic cylinder (24), a second hydraulic rod (25), a baffle plate (26), a bottom plate (27), a pushing block (28), a sliding plate (29) and a square plate (291). The first hydraulic cylinder (23) is fixedly installed on the top of the pressing plate (7). The first hydraulic rod (22) is slidably installed on the inner wall of the first hydraulic cylinder (23). The pulling plate (21) is fixedly installed at one end of the first hydraulic rod (22) away from the first hydraulic cylinder (23). The pushing plate (20) is fixedly installed on one side of the outer rod (10) close to the pulling plate (21). The second hydraulic cylinder (24) is fixedly installed on the top of the support platform (1). The second hydraulic rod (25) is slidably installed on the inner wall of the second hydraulic cylinder (24). The bottom plate (27) is slidably installed on the top of the support platform (1). The baffle plate (26) is slidably installed on the inner wall of the bottom plate (27). The pushing block (28) is fixedly installed on one side of the baffle plate (26) away from the welding head (5). The sliding plate (29) is slidably installed on the top of the support platform (1). The square plate (291) is slidably installed on the circumferential surface of the rotating shaft of the turntable (4).

6. The laser welding fixture for a sandwich panel according to claim 5, characterized in that: The first hydraulic cylinder (23) is communicated with the second hydraulic cylinder (24) through a hose. A fifth spring is provided between the baffle plate (26) and the bottom plate (27). A sixth spring is provided between the pulling plate (21) and the pressing plate (7). A seventh spring is provided between the sliding plate (29) and the support platform (1). The baffle plate (26) contacts the second hydraulic rod (25). The bottom plate (27) contacts the welding head (5).

7. A laser welding fixture for a sandwich panel according to claim 6, characterized in that: The scraping device includes a connecting rod (30), a rack (31), a first gear (32), a second gear (33), a vertical plate (34), an oil tank (35), a rotating push rod (36), a sleeve rod (37) and a scraper (38). The vertical plate (34) is slidably installed on the top of the support platform (1). The connecting rod (30) is fixedly installed on one side of the bottom plate (27) close to the vertical plate (34). The rack (31) is fixedly installed on one side of the connecting rod (30) close to the vertical plate (34). The first gear (32) is rotatably installed on the top of the support platform (1). The second gear (33) is rotatably installed on one side of the vertical plate (34) close to the first gear (32). The oil tank (35) is fixedly installed on one side of the vertical plate (34) close to the first gear (32). The rotating push rod (36) is rotatably installed on one side of the vertical plate (34) away from the first gear (32). The sleeve rod (37) is slidably installed on the circumferential surface of the rotating push rod (36). The scraper (38) rotates on one side of the sleeve rod (37) away from the vertical plate (34).

8. A laser welding fixture for a sandwich panel according to claim 7, characterized in that: The fuel tank (35) is communicated with the sleeve rod (37) through a telescopic pipe. A first one-way valve is provided at the position where the sleeve rod (37) is communicated with the telescopic pipe. The scraper (38) is communicated with the sleeve rod (37). A second one-way valve is provided at the position where the scraper (38) is communicated with the sleeve rod (37). An oil outlet is formed on the side of the scraper (38) close to the plate member. The rotating shaft of the second gear (33) is connected to the rotating push rod (36) through a belt drive. An eighth spring is provided between the sleeve rod (37) and the rotating push rod (36).

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