L-shaped sheet metal tailor-welded roll-over stand

Abstract

The invention relates to the technical field of welding, and discloses an L-shaped metal plate tailor-welding roll-over stand which comprises a rack and a tailor-welding module. The tailor-welding module comprises a first overturning table and a second overturning table, the first overturning table and the second overturning table rotate on the rack and can be overturned to a horizontal state in a back-to-back mode or overturned to a vertical state in a relative mode, and the first overturning table and the second overturning table are provided with butt joint positioning modules for ensuring butt joint of the supporting plate and the mounting plate and limiting the supporting plate and the mounting plate after butt joint; the butt joint positioning module comprises a backer, a limiting protruding block and a lifting limiting assembly. The lifting limiting assembly comprises a first limiting block, a second limiting block and a third limiting block, and the first limiting block, the second limiting block and the third limiting block are in a retraction state in a normal state and are driven by gravity generated when the supporting plate and the mounting plate slide downwards to stretch out. According to the turnover frame, accurate splicing of the mounting plate and the supporting plate and limiting after splicing can be automatically achieved, and an accurate positioning reference is provided for reinforcing ribs.

Description

Technical Field

[0001] The present invention relates to the field of welding technology, and particularly to an L-shaped sheet metal welding and flipping frame. Background Art

[0002] Referring to Figures 1-3 As shown, an L-shaped sheet metal part 2 is provided in the injection base 1 of an injection molding machine. The L-shaped sheet metal part 2 is mainly used for assembling a valve plate and providing stable support for the valve plate. The L-shaped sheet metal part 2 includes an L-shaped frame plate and four reinforcing ribs 203 above. The L-shaped frame plate has two bends. Due to the minimum bending width limitation of a common bending machine for Z-shaped bends, the L-shaped frame plate cannot be bent into shape at one time and can only be split into two parts, namely a mounting plate 201 in a flat shape for assembling the valve plate and a support plate 202 with one bend (formed by bending with a bending machine) and a large weight-reducing groove 2021. A welder welds the mounting plate 201, the support plate 202, and the four reinforcing ribs 203 into one body. The existing positioning method generally adopts an artificial positioning method. It is necessary for the welding personnel to pre-position the mounting plate 201 and the support plate 202 with a square, then weld the two positioned plates, and finally position the reinforcing ribs 203 in sequence and weld them one by one. Since the L-shaped sheet metal part 2 is exposed outside the injection molding base 1 and is an appearance decoration part, it has high requirements for overall dimensional accuracy, perpendicularity, etc. There are the following problems with manual welding: 1. The weight of the L-shaped sheet metal part 2 is greater than 50 kg, and a single person cannot ensure the perpendicularity requirement of the two plates while correcting deformation and welding, and multiple people are required to cooperate to complete it, resulting in high labor costs; 2. The accuracy of manual welding cannot be guaranteed, resulting in large welding errors and ultimately difficult assembly.

[0003] The Chinese patent application text with publication number CN115958370A discloses a powder tank truck frame welding and flipping frame and its use method, which includes two flipping frame monomers, each flipping frame is independently controlled by a set of driving components with gear and rack cooperation, and a limit block for restricting the maximum downward sliding stroke of the product is provided at the bottom of the flipping frame.

[0004] If the above-mentioned welded blank turning frame is used for welding L-shaped sheet metal, the following problems exist: First, there are fixed projections on both sides of the above-mentioned turning frame, and side loading of the mounting plate 201 and the support plate 202 cannot be achieved. Only end loading is possible. In order to achieve precise splicing, the projections need to be used as a guide. Then, it is necessary to set the distance between the two projections to be the same as that of the mounting plate 201 or the support plate 202. The mounting plate 201 and the support plate 202 enter between the two projections in an inserted manner, making the loading difficult. Second, the two groups of limit blocks are respectively fixed on the turning frame. Due to the support plate 202 having an inclined bend, the above-mentioned fixed limit blocks cannot achieve the limit of their maximum stroke, and the support plate 202 is likely to slide down from the gap between the two turning frames and thus cannot achieve automatic docking with the mounting plate 201. Moreover, the above-mentioned turning frame cannot provide positioning for welding the reinforcing rib 203 on the mounting plate 201 or the support plate 202. If manual positioning is used, there will still be problems such as high labor cost and large welding error. Therefore, it is very necessary to provide a welding turning frame that can ensure the welding accuracy of the L-shaped sheet metal. Summary of the Invention

[0005] Aiming at the disadvantages that the existing welded blank turning frame cannot achieve convenient loading, precise splicing, and automatic limiting after splicing of the support plate and the mounting plate in the L-shaped sheet metal, and cannot provide a positioning reference for welding the reinforcing rib, the present invention provides an L-shaped sheet metal welded blank turning frame, which can achieve convenient loading, automatic precise splicing, and automatic limiting after splicing of the support plate and the mounting plate, and can also provide an accurate positioning reference for the reinforcing rib.

[0006] In order to solve the above technical problems, the present invention is solved by the following technical solutions: An L-shaped sheet metal welded blank turning frame includes a frame and a welding module; The welding module includes a first turning table for carrying the support plate and a second turning table for carrying the mounting plate. The first turning table and the second turning table are respectively rotatable on the frame and can be turned away from each other to a horizontal state or turned towards each other to a vertical state. A docking and positioning module for ensuring the butt joint and limiting after butt joint of the support plate and the mounting plate is provided on the first turning table and the second turning table; The docking and positioning module includes a projection, a limit projection, and a lifting limit component; The projections are respectively convexly provided on one side of the first turning table and the second turning table and are used to limit the maximum stroke of the side sliding-in of the support plate and the mounting plate; The limit projection is convexly provided on the second turning table and is used to limit the maximum downward sliding stroke of the mounting plate; The lifting and limiting assembly includes a first limiting block and a second limiting block which are lifted and arranged on the first turning platform, and a third limiting block which is lifted and arranged on the second turning platform. When the first limiting block and the second limiting block are extended, they fit with the side walls of the weight reducing groove on both sides. When the third limiting block is extended, it fits with the side of the mounting plate away from the backrest. The first limiting block, the second limiting block and the third limiting block are in a retracted state in normal state and are extended by gravity when the supporting plate and the mounting plate slide down. When the supporting plate and the mounting plate slide down to the maximum stroke, the two are spliced ​​and automatically limit. The side walls of the backrest, the first limiting block, the second limiting block and the third limiting block respectively provide four reinforcing ribs for fitting and positioning.

[0007] By adopting the above scheme and combining the structural characteristics of the support plate and the mounting plate in the L-shaped sheet metal part, a docking positioning module is added to the conventional first turning table and the second turning table. The support plate and the mounting plate are fed by side entry, and the feeding accuracy requirement is low. The backrest in the docking positioning module is used to limit the maximum stroke of the support plate and the mounting plate entering from the side. When the two plates enter and abut against the backrest, the first turning table and the second turning table are turned over to form a 90° angle, and the mounting plate and the support plate slide down along the inclined surface under the action of their weight. In the added lifting limit block, the first limit block and the second limit block are driven by the weight of the support plate to be lifted to the upper end surface of the first turning table after the support plate slides down to a preset stroke and respectively fits with the side walls of the weight reduction groove. After that, the support plate is guided downward until the first limit block and the second limit block respectively abut against the end of the weight reduction groove away from the lower end; at the same time, the third limit block is driven by the mounting plate after the mounting plate slides down to a preset stroke The weight of the mounting plate drives it to be lifted to the upper end surface of the second turning table and fits with the end of the mounting plate away from the backrest. The maximum stroke of the mounting plate sliding down is related to the limit protrusion. When the support plate and the mounting plate each run to the maximum stroke, the two are connected. The backrest, the first limit block and the second limit block on the first turning table jointly realize the guidance of the support plate sliding down and the limitation of the sliding direction. The backrest, the third limit block and the limit protrusion on the second turning table jointly realize the guidance of the mounting plate sliding down and the limitation of the sliding direction. After the mounting plate and the support plate are spliced ​​and limited, the opposite sides of the first limit block and the backrest and the opposite sides of the second limit block and the third limit block can each provide a reinforcing rib for fitting and positioning. The operator can quickly and labor-savingly perform precise welding of the mounting plate, the support plate and the reinforcing rib. The turning frame can automatically realize the precise splicing of the mounting plate and the support plate and the limitation after splicing, and provide a precise positioning reference for the reinforcing rib.

[0008] Preferably, the lifting and lowering of the third limit block is controlled by a connecting rod driving assembly, which includes a driving rod and a push rod. The driving rod rotates on a fixed axis and is partially protruded above the second flipping table. One end of the driving rod located below the second flipping table is connected to the push rod, and the push rod is staggered with the driving rod. When the upturned part of the driving rod is pressed and flipped downward, the push rod rises and drives the third limit block above it to extend to the upper surface of the second flipping table.

[0009] With the above solution, the driving rod and the ejector rod are arranged out of alignment. After the upturned part of the driving rod is subjected to the gravity of the support plate, it flips downward into the second turning table. The upturned driving rod out of alignment presses against the third limit block upward, causing the third limit block to protrude from the upper surface of the second turning table and fit against the side of the mounting plate away from the backstop. In this way, the third limit block can guide the downward sliding of the mounting plate together with the backstop.

[0010] Preferably, the link driving assembly further includes a driven rod located at the end of the third limit block away from the driving rod. The driven rod rotates on another fixed shaft. Both ends of the ejector rod are rotatably connected to the driving rod and the end of the driven rod away from the fixed shaft respectively. As the driving rod flips downward, the ejector rod lifts and always remains parallel to the second turning table.

[0011] With the above solution, two fixed shafts are provided. The ejector rod flips and swings under the linkage of the driving rod and the driven rod and always remains in a horizontal state. During the swinging process of the ejector rod, there is a change in the vertical height. The third limit block is lifted as the height of the ejector rod increases and descends under its own weight as the height of the ejector rod decreases.

[0012] Preferably, the third limit block is in an inverted U shape and guide grooves for guiding the vertical lifting of the third limit block relative to the second turning table are arranged in parallel on both side walls. A guide block that is guidingly matched with the guide grooves is fixed on the second turning table. The ejector rod is located between the two side walls of the third limit block.

[0013] With the above solution, the guiding of the guide grooves and the guide block can realize the guiding during the lifting of the third limit block. The ejector rod is located between the two side walls of the third limit block, ensuring that the lifting of the ejector rod can cause the third limit block to rise.

[0014] Preferably, a deviation correction assembly for correcting the installation error and ensuring the stable lifting of the third limit block is arranged on the ejector rod. The deviation correction assembly includes at least one set of top members. Both ends of the top member are in contact with or in clearance fit with the two side walls of the third limit block respectively. A sliding sleeve is guidingly sleeved on the ejector rod. A support rod perpendicular to the ejector rod is arranged at the upper end of the sliding sleeve. The top member is inserted into the upper end of the support rod and can move relative to the support rod in the width direction of the third limit block.

[0015] With the above solution, the movement trend of the ejector rod is swinging. Therefore, there is a horizontal position offset during its lifting process. By using the sliding sleeve and the support rod, the top member can be adjusted in the cross direction, thereby adapting to the horizontal position offset during the lifting of the ejector rod and making automatic adjustments, and the error during the assembly process can also be overcome through manual adjustment.

[0016] Preferably, when there is a clearance fit between both ends of the top member and the two side walls of the third limit block, the lower end of the support rod is pivotally connected to the upper end of the sliding sleeve and the support rod can swing relative to the width direction of the third limit block.

[0017] With the above solution, the support rod and the sliding sleeve are pivotally connected and matched, further increasing the freedom degree of the adjustment of the top piece.

[0018] Preferably, the first flipping table and the second flipping table flip relatively or away from each other synchronously and are controlled by a linkage drive assembly. The linkage drive assembly includes a link drive component and a gear transmission component. The link drive component is arranged between the frame and the second flipping table and is used to realize the up-and-down flipping of the second flipping table; the gear transmission component is used to realize the synchronous up-flipping or down-flipping of the first flipping table along with the second flipping table.

[0019] Preferably, the link drive component includes a drive motor and a drive link component. The drive link component includes a first link and a second link hinged at the end. The opposite ends of the first link and the second link are respectively hinged to the second flipping table and the frame, and the motor shaft of the drive motor is fixedly connected to the shaft fixed on the second link.

[0020] Preferably, the gear transmission component includes a driving gear and a driven gear that mesh with each other. The driving gear and the driven gear are respectively coaxially fixed on the rotating shafts of the second flipping table and the first flipping table.

[0021] With the above solution, in the linkage drive assembly, the flipping of the second flipping table drives the rotation of the first flipping table synchronously through the gear transmission component and makes the two move relatively or away from each other, while the link drive component can realize the flipping of the second flipping table by using one drive motor.

[0022] Preferably, a guiding chute for the limiting convex block to be embedded and slide guidingly is arranged on the second flipping table, and an elastic member is arranged in the guiding chute and is fixed to the limiting convex block and the end wall of the guiding chute at both ends and is used to slow down the sliding speed of the mounting plate.

[0023] With the above solution, the limiting convex block slides guidingly in the guiding chute and is driven by the elastic member, which can slow down the sliding speed of the mounting plate and reduce the impact force received during the splicing of the mounting plate.

[0024] Due to the adoption of the above technical solutions, the present invention has remarkable technical effects: a docking and positioning module is added, and the support plate and the mounting plate are fed in a side-entry manner, with low requirements for feeding accuracy. In this docking and positioning module, the backstop is used to limit the maximum stroke of the side-entry of the support plate and the mounting plate. When the two plates enter and abut against the backstop, the first flipping table and the second flipping table flip up to form a 90° angle. The mounting plate and the support plate slide down along the inclined plane under the action of their own gravity. In the added lifting and limiting assembly, the first limiting block and the second limiting block are lifted to the upper end surface of the first flipping table and respectively fit against the two side walls of the weight-reducing groove after the support plate slides down to a preset stroke under the drive of the gravity of the support plate. Thereafter, the support plate is guided downward until the first limiting block and the second limiting block respectively abut against one end of the weight-reducing groove far from the sliding end; at the same time, the third limiting block is lifted to the upper end surface of the second flipping table and fits against one end of the mounting plate far from the backstop after the mounting plate slides down to a preset stroke under the drive of the weight of the mounting plate. The maximum sliding stroke of the mounting plate is related to the limiting convex block. When the support plate and the mounting plate each run to the maximum stroke, the docking of the two is completed. The backstop, the first limiting block and the second limiting block on the first flipping table jointly realize the guiding of the sliding of the support plate and the limiting of the sliding direction. The backstop, the third limiting block and the limiting convex block on the second flipping table jointly realize the guiding of the sliding of the mounting plate and the limiting of the sliding direction. After the mounting plate and the support plate are spliced and limited, the relative sides of the first limiting block and the backstop and the relative sides of the second limiting block and the third limiting block can each be fitted and positioned by a reinforcing rib. The operator can quickly and labor-savingly perform precise welding of the mounting plate, the support plate and the reinforcing rib. This flipping frame can automatically realize the precise splicing of the mounting plate and the support plate and the limiting after splicing, and provide a precise positioning reference for the reinforcing rib. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is an axonometric view of an injection base of the prior art; Figure 2 is an axonometric view of an L-shaped sheet metal part of the prior art; Figure 3 is an exploded view of an L-shaped sheet metal part of the prior art; Figure 4 is an axonometric view of an L-shaped sheet metal welding and flipping frame of this embodiment flipped to 90° Figure 1 ; Figure 5 is an axonometric view of an L-shaped sheet metal welding and flipping frame of this embodiment flipped to 90° Figure 2 ; Figure 6 is Figure 5 an enlarged view of A of Figure 7 is Figure 5 an enlarged view of B of Figure 8 is Figure 5 an enlarged view of C of Figure 9 An isometric view of the L-shaped sheet metal part welding and flipping frame of this embodiment flipped to the horizontal state; Figure 10 A front view of the L-shaped sheet metal welding and flipping frame of this embodiment when the product splicing is completed; Figure 11 An isometric view of the L-shaped sheet metal part welding and flipping frame of this embodiment when the product splicing is completed; Figure 12 An isometric view of the connecting rod drive assembly of this embodiment; Figure 13 An isometric view of the third limit block and the connecting rod drive assembly of this embodiment when they cooperate;

[0026] The names of the parts referred to by each numerical label in the above drawings are as follows: 1. Injection base; 2. L-shaped sheet metal part; 201. Mounting plate; 202. Support plate; 2021. Weight reduction groove; 203. Reinforcing rib; 3. Frame; 4. First flipping table; 5. Second flipping table; 6. Backing; 7. First limit block; 8. Second limit block; 9. Third limit block; 10. Limit convex block; 11. Elastic member; 12. Driving motor; 13. First connecting rod; 14. Second connecting rod; 15. Driving gear; 16. Driven gear; 17. Driving rod; 18. Fixed shaft; 19. Jacking rod; 20. Sliding sleeve; 21. Support rod; 22. Jacking part; 23. Docking inclined surface; 24. Movable shaft; 25. Guide groove; 26. Driven rod. Detailed implementation manners

[0027] The present invention will be further described in detail below in conjunction with the drawings and embodiments.

[0028] An L-shaped sheet metal welding and flipping frame, in combination with Figures 4-13 As shown, it includes a frame 3 and a welding and splicing module. The welding and splicing module includes a first flipping table 4 for carrying the support plate 202 and a second flipping table 5 for carrying the mounting plate 201. The first flipping table 4 and the second flipping table 5 are respectively rotatable on the frame 3 and can be synchronously flipped away from each other to the horizontal state or synchronously flipped towards each other to a state where they are perpendicular to each other. The first flipping table 4 and the second flipping table 5 are controlled by a linkage drive assembly. The first flipping table 4 and the second flipping table 5 are provided with a docking and positioning module for ensuring the butt joint of the support plate 202 and the mounting plate 201 and limiting them after the butt joint.

[0029] Refer to Figures 4-5As shown, the docking and positioning module includes a backing 6, a limiting bump 10, and a lifting limiting component. The backing 6 protrudes from one side of the first flipping table 4 and the second flipping table 5 respectively and is used to limit the maximum stroke of the side-sliding of the support plate 202 and the mounting plate 201. The support plate 202 and the mounting plate 201 adopt the method of lateral feeding, and the feeding accuracy requirement is low. A guiding chute is opened on the second flipping table 5 along the direction of the downward sliding of the mounting plate 201. The limiting bump 10 is embedded and slidably arranged in the guiding chute. Fixed blocks are fixed at both ends of the guiding chute, and the upper end surface of the fixed block is lower than or equal to the upper surface of the second flipping table. The lower fixed block is used to limit the maximum downward sliding stroke of the limiting bump 10. An elastic member 11 with both ends fixed to the two is arranged between the limiting bump 10 and the upper fixed block in the guiding chute. The elastic member 11 is a tension spring. After the limiting bump 10 is combined with the elastic member 11, it can buffer the downward sliding speed of the mounting plate 201 and reduce the impact force received by the mounting plate 201 before splicing.

[0030] The lifting limiting component includes a first limiting block 7 and a second limiting block 8 that are lifted and arranged on the first flipping table 4 and a third limiting block 9 that is lifted on the second flipping table 5. When the first limiting block 7 and the second limiting block 8 extend, they are in contact with the two side walls of the weight-reducing groove 2021. When the third limiting block 9 extends, it is in contact with the side of the mounting plate 201 away from the backing 6. The first limiting block 7, the second limiting block 8, and the third limiting block 9 are in a retracted state under normal conditions and are driven to extend by the gravity when the support plate 202 and the mounting plate 201 slide downward. When the support plate 202 and the mounting plate 201 slide to the maximum stroke, the two are spliced and automatically limited. The side walls of the backing 6 opposite to the first limiting block 7 and the side walls of the second limiting block 8 opposite to the third limiting block 9 are respectively for four reinforcing ribs 203 to be fitted and positioned.

[0031] The lifting of the first limiting block 7, the second limiting block 8, and the third limiting block 9 is respectively controlled by a set of link driving components with the same structure. Combined with Figure 6 , Figure 8 , Figure 12 and Figure 13As shown in the figure, the following takes the link drive assembly cooperating with the third limit block 9 as an example for description. The link drive assembly includes a drive rod 17 and a push rod 19. The drive rod 17 rotates on a fixed shaft 18 and partially protrudes above the second flipping table 5. The fixed shaft 18 is embedded in a relief groove of the second flipping table 5. After passing through the relief groove, the drive rod 17 is located above the second flipping table 5. There are two fixed shafts 18 arranged at intervals along the sliding direction of the support plate 202. The drive rod 17 is located at one end close to the splicing direction, and a driven rod 26 is rotatably connected to the other end away from the splicing direction. A movable shaft 24 is rotatably connected to the lower ends of both the drive rod 17 and the driven rod 26. The two ends of the push rod 19 are respectively rotatably connected to the two movable shafts 24. The push rod 19 is located at the end of the movable shaft 24 away from the drive rod 17 and the driven rod 26. In order to maintain balance, a synchronizing rod parallel to and moving synchronously with the push rod 19 is also rotatably connected to the end close to the drive rod 17 and the driven rod 26. When the upturned part of the drive rod 17 is pressed and turned downward, the push rod 19 swings and upturns.

[0032] The third limit block 9 is in an inverted U shape, and guide grooves 25 for guiding the vertical lifting of the third limit block 9 relative to the second flipping table 5 are arranged in parallel on both side walls. A guide block guidingly cooperating with the guide grooves 25 is fixed on the second flipping table 5. The push rod 19 is located between the two side walls of the third limit block 9.

[0033] A deviation correction assembly for correcting installation errors and ensuring the stable lifting of the third limit block 9 is arranged on the push rod 19. The deviation correction assembly includes two groups of top members 22 arranged in parallel. The two ends of the top member 22 are in clearance fit with the two side walls of the third limit block 9 respectively. A sliding sleeve 20 is guidingly sleeved on the push rod 19. A support rod 21 perpendicular to the push rod 19 is arranged at the upper end of the sliding sleeve 20. The top member 22 is inserted into the upper end of the support rod 21 and can move relative to the support rod 21 along the width direction of the third limit block 9. The lower end of the support rod 21 is pivotally connected to the upper end of the sliding sleeve 20, and the support rod 21 can swing relative to the width direction of the third limit block 9. The movement trend of the push rod 19 is to swing. Therefore, there is a horizontal position deviation during its lifting process. By using the sliding sleeve 20 and the support rod 21, the top member 22 can be adaptively adjusted in multiple degrees of freedom, thereby adapting to the horizontal position deviation of the push rod 19 during the lifting process, and the errors existing in the assembly process can also be eliminated through manual adjustment.

[0034] The linkage drive assembly includes a link drive component and a gear transmission component. The link drive component includes a drive motor 12 and a drive link component. The drive link component includes a first link 13 and a second link 14 hinged at the ends. The opposite ends of the first link 13 and the second link 14 are respectively hinged to the second turning table 5 and the frame 3. There are two groups of drive link components arranged in parallel. The motor shaft of the drive motor 12 is fixedly connected to the shaft fixed on one of the second links 14, and this shaft is concentric with the shaft where the second link 14 is rotatably connected to the frame 3. The gear transmission component includes a driving gear 15 and a driven gear 16 that mesh with each other. The driving gear 15 and the driven gear 16 are respectively coaxially fixed on the rotating shafts of the second turning table 5 and the first turning table 4. On the opposite sides of the first turning table 4 and the second turning table 5, there are docking inclined surfaces 23 that fit together to form a limit when the two turn relative to each other to a vertical state.

[0035] The welding process is as follows: Initial state of the turning table: The first limit block 7, the second limit block 8, and the third limit block 9 are in a descending state under their own weight and drive the top piece 22 and the ejector rod 19 to descend. The descent of the ejector rod 19 causes the drive rod 17 to be in an upwardly tilted state. After the first limit block 7, the second limit block 8, and the third limit block 9 descend, they are lower than the upper planes of the first turning table 4 and the second turning table 5. The first turning table 4 and the second turning table 5 are in a horizontal state.

[0036] Feeding: The support plate 202 and the mounting plate 201 are respectively conveyed by an automatic feeding device (not shown) to the specified positions on the sides of the first turning table 4 and the second turning table 5 away from the backing 6. See Figure 9 As shown, the automatic feeding device simultaneously pushes the support plate 202 and the mounting plate 201 into the first turning table 4 and the second turning table 5 until they are in contact with the backing 6. Splicing: The driving motor 12 rotates forward, driving the second flipping table 5 to flip upward, and at the same time driving the first flipping table 4 to flip upward by 45°. The support plate 202 and the mounting plate 201 slide downward from the first flipping table 4 and the second flipping table 5 respectively due to the action of gravity. When the support plate 202 contacts the driving rods 17 corresponding to the first limiting block 7 and the second limiting block 8, and the mounting plate 201 contacts the driving rod 17 corresponding to the third limiting block 9, the driving rod 17 flips downward and drives the ejector rod 19 to swing upward. As the ejector rod 19 swings upward, the ejecting part 22 is lifted, and then presses the first limiting block 7 and the second limiting block 8 to extend beyond the upper surface of the first flipping table 4, and the third limiting block 9 extends beyond the second flipping table 5. The first limiting block 7 and the second limiting block 8 are respectively attached to the two side walls of the weight-reducing groove 2021 on the support plate 202, playing a role in guiding the downward sliding of the support plate 202. And when the support plate 202 slides to the end of the weight-reducing groove 2021 far from the splicing end and abuts against the first limiting block 7 and the second limiting block 8, the downward sliding of the support plate 202 is limited. The third limiting block 9 and the backstop 6 form the guiding for the downward sliding of the mounting plate 201. The mounting plate 201 slowly slides to the maximum sliding stroke of the limiting convex block 10 under the action of the limiting convex block 10, automatically realizing the limit of the downward sliding. When the mounting plate 201 and the support plate 202 are limited, the precise splicing of the two is just achieved. At this time, the opposite side walls of the backstop 6 and the first limiting block 7 and the opposite side walls of the second limiting block 8 and the third limiting block 9 can each be positioned and attached to a reinforcing rib 203.

[0037] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art in this technical field, several improvements and refinements made without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An L-shaped sheet metal welding turning frame, comprising a frame (3) and a welding module; The welding module comprises a first turning table (4) for carrying a support plate (202) and a second turning table (5) for carrying a mounting plate (201), wherein the first turning table (4) and the second turning table (5) are respectively rotated on a frame (3) and can be turned back to back to a horizontal state or relatively turned to a vertical state, and is characterized in that: The first turning table (4) and the second turning table (5) are provided with a docking positioning module for ensuring that the support plate (202) and the mounting plate (201) are aligned and limited after the alignment; The docking positioning module comprises a backrest (6), a limiting protrusion (10) and a lifting and limiting component; The backrest (6) is respectively protruded on one side of the first turning platform (4) and the second turning platform (5) and is used to limit the maximum travel of the side sliding of the support plate (202) and the mounting plate (201); The limiting protrusion (10) is convexly arranged on the second turning platform (5) and is used to limit the maximum downward movement of the mounting plate (201); The lifting and limiting assembly comprises a first limiting block (7) and a second limiting block (8) which are lifted and arranged on the first turning platform (4) and a third limiting block (9) which is lifted and arranged on the second turning platform (5). When the first limiting block (7) and the second limiting block (8) are extended, they are in contact with the side walls of the weight-reducing groove (2021) on both sides. When the third limiting block (9) is extended, it is in contact with the side of the mounting plate (201) away from the backrest (6). The first limiting block (7), the second limiting block (8) and the third limiting block (9) are in a retracted state in a normal state and are extended by gravity when the support plate (202) and the mounting plate (201) slide down. When the support plate (202) and the mounting plate (201) slide down to the maximum stroke, the two are spliced ​​and the limiting is automatically realized. The side walls of the backrest (6), the first limiting block (7), the second limiting block (8) and the third limiting block (9) are respectively provided for the four reinforcing ribs (203) to be fitted and positioned.

2. The L-shaped sheet metal welding turning frame according to claim 1, characterized in that: The lifting and lowering of the third limit block (9) is controlled by a connecting rod driving assembly, which comprises a driving rod (17) and a push rod (19). The driving rod (17) rotates on a fixed shaft (18) and is partially protruded above the second turning platform (5). One end of the driving rod (17) located below the second turning platform (5) is connected to the push rod (19). The push rod (19) and the driving rod (17) are staggered. When the upwardly tilted part of the driving rod (17) is pressed and turned downward, the push rod (19) tilts upward and drives the third limit block (9) located above it to extend to the upper surface of the second turning platform (5).

3. The L-shaped sheet metal welding turning frame according to claim 2, characterized in that: The connecting rod driving assembly also includes a driven rod (26) located at one end of the third limit block (9) away from the driving rod (17), the driven rod (26) rotates on another fixed shaft (18), and the two ends of the top rod (19) are respectively rotatably connected to the driving rod (17) and the end of the driven rod (26) away from the fixed shaft (18), and as the driving rod (17) flips downward, the top rod (19) is lifted and is always in a parallel state with the second flipping platform (5).

4. The L-shaped sheet metal welding turning frame according to claim 3 is characterized in that: The third limit block (9) is in an inverted U shape and has two side walls which are parallelly provided with guide grooves (25) for guiding the third limit block (9) to vertically rise and fall relative to the second turning platform (5). A guide block which cooperates with the guide grooves (25) for guiding is fixed on the second turning platform (5). The push rod (19) is located between the two side walls of the third limit block (9).

5. The L-shaped sheet metal welding turning frame according to claim 4, characterized in that: The push rod (19) is provided with a deviation correction component for correcting installation errors and ensuring the stable lifting of the third limit block (9). The deviation correction component comprises at least one set of push pieces (22). The two ends of the push pieces (22) are respectively fitted or gap-matched with the side walls of the third limit block (9). The guide sleeve on the push rod (19) is provided with a sliding sleeve (20). The upper end of the sliding sleeve (20) is provided with a support rod (21) perpendicular to the push rod (19). The push piece (22) is inserted into the upper end of the support rod (21) and can move relative to the support rod (21) along the width direction of the third limit block (9).

6. The L-shaped sheet metal welding turning frame according to claim 5, characterized in that: When the two ends of the top member (22) are in clearance with the side walls of the third limit block (9), the lower end of the support rod (21) and the upper end of the sliding sleeve (20) are pivotally connected and the support rod (21) can swing relative to the width direction of the third limit block (9).

7. The L-shaped sheet metal welding turning frame according to claim 1, characterized in that: The first turning platform (4) and the second turning platform (5) are turned synchronously relative to each other or opposite to each other and are controlled by a linkage drive assembly, the linkage drive assembly comprising a connecting rod drive component and a gear transmission component, the connecting rod drive component is arranged between the frame (3) and the second turning platform (5) and is used to realize the up and down turning of the second turning platform (5); the gear transmission component is used to realize the first turning platform (4) turning up or down synchronously with the second turning platform (5).

8. The L-shaped sheet metal welding turning frame according to claim 7, characterized in that: The connecting rod driving assembly comprises a driving motor (12) and a driving connecting rod assembly, wherein the driving connecting rod assembly comprises a first connecting rod (13) and a second connecting rod (14) which are hinged at the ends, the ends of the first connecting rod (13) and the second connecting rod (14) which are opposite to each other are hinged to the second turning table (5) and the frame (3) respectively, and the motor shaft of the driving motor (12) is fixedly connected to the shaft fixed on the second connecting rod (14).

9. The L-shaped sheet metal welding turning frame according to claim 7, characterized in that: The gear transmission assembly comprises a driving gear (15) and a driven gear (16) meshing with each other. The driving gear (15) and the driven gear (16) are coaxially fixed on the rotating shafts of the second turning platform (5) and the first turning platform (4), respectively.

10. The L-shaped sheet metal welding turning frame according to claim 1, characterized in that: The second turning platform (5) is provided with a guide slot for the limit block (10) to be embedded and guided for sliding movement, and an elastic member (11) is provided in the guide slot, the two ends of which are respectively fixed to the limit block (10) and the end wall of the guide slot and used to slow down the sliding speed of the mounting plate (201).

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