Limiting device for welding machining of sheet metal parts

Abstract

The invention discloses a limiting device for sheet metal part welding machining, and particularly relates to the technical field of sheet metal part welding auxiliary equipment.The limiting device is provided with a limiting unit and a telescopic clamping piece to adapt to limiting of reinforced sheet metal parts of different sizes, the frequency of tool replacement is reduced, and the working efficiency is improved. When the reinforcing sheet metal part reaches the height position corresponding to the height position after the rotating supporting part is turned over, the outer plate and the inner plate are converted into the assembling posture parallel to the reinforcing sheet metal part and equal to the reinforcing sheet metal part in height from the initial supporting posture, and the pressing part moves towards the outer plate and the inner plate, so that the outer plate, the reinforcing sheet metal part and the inner plate are accurately attached and in butt joint; multiple limiting in the transverse direction, the vertical direction and the press-fit direction is formed, multi-point spot welding is conducted on the positions corresponding to the open grooves, so that the outer plate, the reinforced sheet metal part and the inner plate are pre-welded and fixed in the attached state, the assembling stability of the three-layer sheet metal part is improved, the problems of dislocation, warping and welding deviation in the spot welding process are effectively solved, and therefore the welding quality is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of sheet metal welding auxiliary equipment, specifically a limiting device for sheet metal welding processing. Background Technology

[0002] Sheet metal parts are widely used in chassis and cabinets, automotive parts, appliance housings, rail transit components, and various mechanical structural parts. During sheet metal production, multiple bent, stamped, or profiled parts often need to be positioned and then welded to form a welded assembly that meets dimensional accuracy and structural strength requirements. Current sheet metal welding processes typically employ manual marking for positioning, ordinary templates, clamping blocks, or simple tooling for clamping and limiting.

[0003] In sheet metal welding, some products require the assembly and spot welding of an outer panel, a middle reinforcing sheet metal part, and an inner panel. Because these three sheet metal parts not only have interlayer bonding but also corresponding positional relationships, the adaptability, guiding ability, and stability of the limiting device are crucial. However, existing limiting structures are mostly designed for single-size sheet metal parts or two-plate butt joint applications, and are often fixed or have a limited adjustment range. When the length, width, or edge dimensions of the sheet metal part change, it is difficult to quickly adjust the limiting position, often requiring tooling changes or recalibration. This results in low switching efficiency between sheet metal parts of different sizes, making it difficult to meet the welding needs of multi-size products. Summary of the Invention

[0004] The purpose of this invention is to provide a limiting device for welding sheet metal parts to solve the problems mentioned in the background art.

[0005] The main technical problem solved by this invention is: Most existing technologies are fixed or have a small adjustment range, making it difficult to quickly adjust the limit position. They often require changing tooling or recalibrating, resulting in low switching efficiency between sheet metal parts of different sizes and difficulty in meeting the welding processing needs of products with multiple specifications.

[0006] This invention can be achieved through the following technical solutions: A limiting device for welding sheet metal parts includes a lower base plate and an upper base frame. The upper surface of the lower base plate is provided with a conveying unit, and a stroke cylinder is installed on the conveying unit. The pushing end of the stroke cylinder is connected to a limiting unit for limiting reinforced sheet metal parts of different sizes. The limiting unit includes a frame connected to the push end of the stroke cylinder, and telescopic clips that move in opposite directions are slidably installed on both sides of the inside of the frame. The telescopic clamp includes a lower limit plate that is slidably installed at the bottom of the inner cavity of the frame, and an upper limit plate that is movable at the top of the inner cavity of the frame is slidably installed on the top of the lower limit plate. The inner walls of both the lower and upper limit plates are fitted with limiting components for fixing the edges of the reinforced sheet metal parts, and the surfaces of both the lower and upper limit plates are provided with several slots for spot welding. The top of the inner cavity of the frame is provided with a limiting plate that limits sliding in the vertical direction, and the surface of the limiting plate and the bottom of the inner cavity of the frame are provided with limiting springs for resetting the telescopic card. The upper base frame has two rotating support members that move synchronously closer or further apart. An opening is formed between the two rotating support members for the frame to pass through, and the two rotating support members are respectively attached and fixed to the outer panel and the inner panel; The frame is provided with pressing units at both ends to connect the outer and inner panels with the reinforcing sheet metal parts. The pressing unit includes a rotating plate rotatably installed on both edges of the frame, and the end of the rotating plate is provided with a pressing component.

[0007] A further technical improvement of the present invention is that: the limiting spring component includes a side plate fixed to the end of the limiting plate or fixed to the bottom of the inner cavity of the frame, the ends of the upper limiting plate and the lower limiting plate slide through the corresponding side plate, and a spring is sleeved on one end of the upper limiting plate and the lower limiting plate that extends into the side plate, and the ends of the upper limiting plate and the lower limiting plate are provided with a contact portion; The inner cavity of the frame is provided with an upper cam roller and a lower cam, which are driven by corresponding servo motors at the top and bottom, respectively. The upper cam roller abuts against the upper contact part, and the lower cam abuts against the lower contact part.

[0008] A further technical improvement of the present invention is that: the limiting member includes a reset cavity provided on the inner wall of the lower limiting plate or the upper limiting plate, an electromagnet is installed in the reset cavity, the armature end of the electromagnet is attracted and connected to a triangular block, the triangular block slides within the corresponding reset cavity, and the end of the triangular block facing the entrance of the frame is a pushing slope.

[0009] A further technical improvement of the present invention is that: the pressing component includes a pressing cylinder disposed on the end of a rotating plate with a T-shaped structure, the pushing end of the pressing cylinder is connected to a pressure plate, and an adsorption plate for adsorbing the outer plate or the inner plate is embedded in the inner side of the pressure plate.

[0010] A further technical improvement of the present invention is that: an electric push rod is installed on one side of the top of the lower limit plate, and a fixing block is connected to the pushing end of the electric push rod, and the fixing block is fixed to one side of the bottom of the upper limit plate; The bottom of the upper limit plate is fixed with a limiting part that limits sliding within a groove on the top surface of the lower limit plate.

[0011] A further technical improvement of the present invention is that: the rotating support includes a sliding plate that is limited to sliding within the upper base frame, and the end of the sliding plate facing the opening is rotatably connected to a flip plate that adsorbs the surface of the outer or inner plate. The upper surface of the flip plate is provided with a negative pressure opening, and both the negative pressure opening and the adsorption plate are connected to a vacuum pump through a hose. The upper base frame is equipped with a transmission screw driven by a forward and reverse motor. Two threaded portions on the transmission screw with opposite directions are threadedly engaged with the corresponding slide plate threads.

[0012] A further technical improvement of the present invention is that: the middle edge of the upper surface of the flip plate is provided with a notch for the passage of the pressure plate, and at least one positioning groove is provided on both sides of the notch, and a positioning corner block for restricting the end of the outer plate or the inner plate is installed inside the positioning groove.

[0013] A further technical improvement of the present invention is that the conveying unit includes two linear slide rails, the ends of the two linear slide rails are arranged collinearly, and the slider of each linear slide rail is fixed to a corresponding stroke cylinder.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting a limiting unit, the telescopic clamps on both sides slide within the frame, and the upper and lower limit plates extend and retract, allowing the telescopic clamps to adapt to the limiting of reinforcing sheet metal parts of different sizes. This reduces the frequency of tooling changes. After the reinforcing sheet metal part moves with the conveying unit to directly below the opening, the stroke cylinder pushes the frame upward and into the opening, causing the reinforcing sheet metal part to reach the height position corresponding to the rotation of the rotating support. The two rotating supports change from an initial state of being far apart to a state of being close together, and simultaneously rotate 90 degrees. The outer and inner panels are transformed from their initial supporting posture to an assembly posture parallel and at the same height as the reinforcing sheet metal parts. The pressing parts move towards the outer and inner panels, enabling the outer panel, reinforcing sheet metal parts, and inner panel to accurately fit and align. This creates multiple limiting positions in the horizontal, vertical, and pressing directions. Multiple spot welds are then applied at the corresponding slot positions, allowing the outer panel, reinforcing sheet metal parts, and inner panel to be pre-welded and fixed in the fitted state. This improves the stability of the three-layer sheet metal assembly and effectively reduces misalignment, warping, and welding deviations that occur during spot welding, thereby ensuring welding quality. 2. By setting a limiting component, when the reinforced sheet metal part enters from the frame entrance, it first contacts the pushing slope and applies a pushing force along the sliding direction of the reset cavity to the triangular block. Within the allowable range, it retracts towards the inside of the reset cavity, avoiding hard interference between the reinforced sheet metal part and the limiting component when entering the frame. This continues until its edge gradually passes the highest blocking part of the triangular block. The blocking part of the triangular block is elastically reset by the built-in elastic element of the electromagnet and extends outward, forming a locking fit with the edge of the reinforced sheet metal part, thus creating a one-way limiting effect on the reinforced sheet metal part. After installation, it restricts its reverse withdrawal or movement. When the outer and inner panels are being bonded, the electromagnet is activated, causing the triangular block to retract into the reset cavity under the magnetic attraction of the armature to reduce its protrusion and avoid interference during the bonding process of the outer and inner panels. 3. By setting up rotating support components and pressing components, the two flip plates move towards the center synchronously with the sliding plate. The flip plates carry the attracted outer and inner plates gradually towards the reinforcing sheet metal part located in the middle. At the same time, the flip plates flip over, causing the outer and inner plates to gradually change from their initial placement posture to an assembly posture parallel to the reinforcing sheet metal part. The rotating plates on both sides change from an open state to a rotating and flipped state. As they rotate, the pressing components move towards the outer and inner plates. After passing through the corresponding notches, the adsorption plates press the corresponding outer and inner plates against the reinforcing sheet metal part located in the middle, so that the outer plate, reinforcing sheet metal part, and inner plate form a stable three-layer bonding state. 4. By setting up a conveying unit, when the frame on one linear slide rail slider is used to reinforce the stable bonding of the sheet metal parts with the outer and inner panels, the frame on the other linear slide rail slider normally feeds the next reinforced sheet metal part. Meanwhile, the rotating support parts on both sides return to their original positions after being installed in the frame, and continue to undertake the feeding of the next outer and inner panels. This allows the feeding of reinforced sheet metal parts, the feeding of outer and inner panels, and the bonding and assembly of the three to be carried out alternately and in parallel, reducing the waiting time of the process and improving the overall processing efficiency. Attached Figure Description

[0015] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the external structure of the present invention; Figure 2 For the present invention Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is a schematic diagram of the three-dimensional installation structure of the frame and the lower limiting plate of the present invention; Figure 4 This is a schematic diagram of the installation structure of the triangular block of the present invention; Figure 5 This is a schematic diagram of the installation structure of the upper positioning plate and the frame of the present invention; Figure 6This is a schematic diagram of the installation structure of the adsorption plate of the present invention.

[0017] In the diagram: 1. Upper base frame; 2. Lower base plate; 3. Linear slide rail; 4. Stroke cylinder; 5. Frame; 6. Through-hole; 7. Flip plate; 8. Positioning groove; 9. Positioning corner block; 10. Slide plate; 11. Transmission screw; 12. Rotating plate; 13. Triangular stop block; 14. Lower limit plate; 15. Upper limit plate; 16. Slot; 17. Electric push rod; 18. Electromagnet; 19. Upper cam roller; 20. Limiting plate; 21. Side plate; 22. Limiting part; 23. Spring; 24. Contact part; 25. Lower cam; 26. Pressing cylinder; 27. Pressure plate; 28. Adsorption plate. Detailed Implementation

[0018] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0019] Please see Figures 1-6 As shown, the present invention provides a limiting device for welding processing of sheet metal parts, including a lower base plate 2. The four ends of the lower base plate 2 are connected to an upper base frame 1 through corresponding brackets. The upper surface of the lower base plate 2 is provided with a conveying unit. A stroke cylinder 4 is installed on the conveying unit. The pushing end of the stroke cylinder 4 is connected to a limiting unit for limiting the size of reinforced sheet metal parts. The limiting unit includes a frame 5 connected to the push end of the stroke cylinder 4, and telescopic clips that move in opposite directions are slidably installed on both sides of the inside of the frame 5. The telescopic clamp includes a lower limit plate 14 that is slidably installed at the bottom of the inner cavity of the frame 5, and an upper limit plate 15 that is movable at the top of the inner cavity of the frame 5 is slidably installed on the top of the lower limit plate 14. The inner walls of the lower limit plate 14 and the upper limit plate 15 are both fitted with limiting members for fixing the edges of the reinforced sheet metal parts, and the surfaces of the lower limit plate 14 and the upper limit plate 15 are both provided with a number of slots 16 for spot welding. The top of the inner cavity of the frame 5 is provided with a limiting plate 20 that limits sliding in the vertical direction. The surface of the limiting plate 20 and the bottom of the inner cavity of the frame 5 are provided with limiting springs for resetting the telescopic clips. The upper base frame 1 has two rotating supports that move synchronously closer or further apart. An opening 6 is formed between the two rotating support members for the frame 5 to pass through, and the two rotating support members are respectively attached and fixed to the outer plate and the inner plate; The frame 5 has pressing units at both ends for connecting the outer and inner panels with the reinforcing sheet metal parts. The pressing unit includes a rotating plate 12 rotatably mounted on both edges of the frame 5, and a pressing part is provided at the end of the rotating plate 12.

[0020] like Figure 1 As shown, initially, the pressing unit is in a rotating open state, and the frame 5 is located at the front end of the lower base plate 2. The sliding of the telescopic clips on both sides within the frame 5, and the extension and retraction of the upper limit plate 15 and the lower limit plate 14, allow the telescopic clips to adapt to the limiting of different sized reinforcing sheet metal parts, reducing the frequency of tooling changes and thus improving the adaptability of the limiting unit. After the reinforcing sheet metal parts are installed in the frame 5, the limiting parts directly contact the edge of the reinforcing sheet metal parts and form a fixing effect, thereby preventing the reinforcing sheet metal parts from shifting laterally, moving back and forth, or warping locally during subsequent pressing and spot welding.

[0021] The limit spring mechanism undergoes elastic deformation when the telescopic clamp holds the reinforced sheet metal part. After the external force is released, the telescopic clamp returns to its initial position, facilitating the entry of the next workpiece and avoiding the efficiency loss caused by manual reset.

[0022] At the same time, the outer and inner panels are pre-positioned on the rotating support components in their initial state, and their positions and postures are stabilized by adsorption, thus creating conditions for precise docking with the reinforced sheet metal parts in the future. When the reinforcing sheet metal part moves with the conveying unit to directly below the opening 6, the stroke cylinder 4 actuates, pushing the frame 5 connected to its front end to rise and enter the opening 6. The frame 5, as the load-bearing structure of the limiting unit, drives the internal reinforcing sheet metal part to the height position corresponding to the height position after the rotating support is flipped during the movement. During this process, the two rotating support parts change from an initial state of being far apart to a state of being close together, and simultaneously undergo a 90-degree flip, so that the outer panel and inner panel change from their initial support posture to an assembly posture that is parallel and at the same height as the reinforcing sheet metal part. As the two rotating support parts continue to approach each other, the limiting part no longer forms a protruding limit on the edge of the reinforcing sheet metal part in the return state. At this time, the lower limit plate 14 and the upper limit plate 15 jointly abut against the contact surface of the reinforcing sheet metal part, providing stable support and guidance for the reinforcing sheet metal part until the reinforcing sheet metal part forms interlayer contact with the outer panel and the inner panel. Then, as Figure 3As shown, the rotating plates 12 on both sides change from an open state to a rotating and flipped state. As they rotate, the pressing parts move towards the outer and inner plates, pressing the outer and inner plates against the reinforcing sheet metal part located in the middle, so that the outer plate, reinforcing sheet metal part, and inner plate can be accurately fitted and connected. Under the action of the pressing unit, the outer plate, reinforcing sheet metal part, and inner plate form a stable three-layer assembly state. On the one hand, the rotating support parts support and fix the outer and inner plates; on the other hand, the limiting unit limits the edge of the reinforcing sheet metal part; in addition, the pressing unit presses the three-layer plates tightly together from both ends, forming multiple limits in the horizontal, vertical, and pressing directions. Then, multi-point spot welding is performed at the position corresponding to the slot 16, so that the outer plate, reinforcing sheet metal part, and inner plate are pre-welded and fixed in the fitted state, improving the stability of the three-layer sheet metal assembly, effectively reducing misalignment, warping, and welding deviation problems that occur during spot welding, thereby ensuring welding quality.

[0023] See Figure 5 As shown, the limiting spring includes a side plate 21 fixed to the end of the limiting plate 20 or fixed to the bottom of the inner cavity of the frame 5. The ends of the upper limiting plate 15 and the lower limiting plate 14 slide through the corresponding side plate 21, and a spring 23 is sleeved on one end of the upper limiting plate 15 and the lower limiting plate 14 that extends into the side plate 21. The ends of the upper limiting plate 15 and the lower limiting plate 14 are provided with contact portions 24. The top and bottom of the inner cavity of the frame 5 are respectively provided with an upper cam roller 19 and a lower cam 25 driven by corresponding servo motors. The upper cam roller 19 abuts against the upper contact part 24, and the lower cam 25 abuts against the lower contact part 24.

[0024] In the initial state, the spring 23 is in a naturally stretched or pre-compressed state, and the upper limit plate 15 and the lower limit plate 14 are kept in the initial limit position under the action of the spring 23.

[0025] When it is necessary to limit the movement of reinforced sheet metal parts of different sizes, the corresponding servo motor is controlled to work, driving the upper cam roller 19 and the lower cam 25 to rotate synchronously. Under the change of cam profile, the upper limit plate 15 and the lower limit plate 14 simultaneously retract in the direction away from or towards the reinforced sheet metal part, and adjust their positions according to the size change of the reinforced sheet metal part.

[0026] When the two telescopic clamps move away from each other, the upper limit plate 15 and the lower limit plate 14 extend and retract, causing the side plate 21 to slide vertically at the top of the inner cavity of the frame 5, which is suitable for the installation of large-sized reinforced sheet metal parts. When they are close together and do not extend or retract, they are suitable for the installation of small-sized reinforced sheet metal parts. The inner limiter is always in contact with the edge of reinforced sheet metal parts of different sizes. The upper limit plate 15 and the lower limit plate 14 together form a clamping limit on the reinforced sheet metal parts in the vertical direction, so that the reinforced sheet metal parts maintain a stable position in the frame 5, and prevent the reinforced sheet metal parts from shifting laterally, moving forward and backward, or warping locally during subsequent conveying, lifting, pressing and spot welding.

[0027] See Figure 3 and Figure 4 As shown, the limiting component includes a reset cavity provided on the inner wall of the lower limit plate 14 or the upper limit plate 15. An electromagnet 18 is installed in the reset cavity. The armature end of the electromagnet 18 is attracted and connected to a triangular block 13. The triangular block 13 slides within the corresponding reset cavity, and the end of the triangular block 13 facing the entrance of the frame 5 is a pushing slope.

[0028] Initially, the triangular stop block 13 is located in a preset position within the reset cavity. When the reinforcing sheet metal part enters through the entrance of the frame 5, it first contacts the pushing inclined surface and applies a pushing force along the sliding direction of the reset cavity to the triangular stop block 13, causing it to retract into the reset cavity within an allowable range. This prevents the reinforcing sheet metal part from interfering with the limiting component when entering the frame 5. As the reinforcing sheet metal part continues to move into the frame 5, its edge gradually passes the highest blocking part of the triangular stop block 13. When the reinforcing sheet metal part moves to the predetermined limit position, the blocking part of the triangular stop block 13 is elastically reset by the built-in elastic element of the electromagnet 18 and extends outward, forming a locking engagement with the edge of the reinforcing sheet metal part. This provides a one-way limiting effect on the reinforcing sheet metal part, preventing it from reversing or moving after insertion.

[0029] See Figure 4 As shown, the pressing component includes a pressing cylinder 26 located at the end of a T-shaped rotating plate 12. The pushing end of the pressing cylinder 26 is connected to a pressure plate 27, and an adsorption plate 28 for adsorbing the outer or inner plate is embedded in the inner side of the pressure plate 27.

[0030] Initially, the rotating plate 12 is in the open position, the pressing cylinder 26 is in the retracted state, and the pressure plate 27 maintains a distance from the outer and inner plates, thus avoiding interference during the loading and alignment of the outer and inner plates with the reinforcing sheet metal parts in the frame 5. As the pressure plate 27 approaches the sheet metal parts, the adsorption plate 28 first contacts the outer or inner plate and stably holds it in place through adsorption, preventing the pressure plate 27 from directly and rigidly pressing against the sheet metal parts and causing slippage. This ensures that the outer or inner plate is in a controlled state before being pressed. Subsequently, the pressing cylinder 26 continues to push the pressure plate 27 forward, thereby driving the adsorbed outer or inner plate closer to the reinforcing sheet metal parts located in the middle position, and finally pressing it against the surface of the reinforcing sheet metal parts.

[0031] The outer and inner panels can be pressed against the reinforcing sheet metal in the middle from both sides simultaneously, thereby forming a stable three-layer bonding structure of the outer panel, the reinforcing sheet metal, and the inner panel. During this process, the adsorption plate 28 not only plays an auxiliary gripping role, but also continuously maintains the stability of the outer or inner panel's posture during the pressing process, preventing the panels from tilting, slipping, or warping due to uneven force.

[0032] See Figure 3 and Figure 5 As shown, an electric push rod 17 is installed on one side of the top of the lower limit plate 14. The pushing end of the electric push rod 17 is connected to a fixing block, and the pushing end of the electric push rod 17 is fitted with a fireproof soft cover. The fixing block is fixed to one side of the bottom of the upper limit plate 15. The bottom of the upper limit plate 15 is fixed with a limiting part 22 that limits sliding within a groove on the top surface of the lower limit plate 14.

[0033] By controlling the extension or retraction of the electric actuator 17, the upper limit plate 15 is moved closer to or further away from the lower limit plate 14. As the position of the upper limit plate 15 changes, a limiting space suitable for the current size of the reinforcing sheet metal part is formed between the upper limit plate 15 and the lower limit plate 14. The limiting members provided on the inner sides of the upper limit plate 15 and the lower limit plate 14 jointly contact the edge surface of the reinforcing sheet metal part, thereby reliably clamping and positioning the reinforcing sheet metal part.

[0034] The fireproof soft cover can provide external protection for the pushing end of the electric actuator 17, reducing the possibility of high-temperature particles, sparks or dust entering the extension part of the electric actuator 17 during the welding process, thereby reducing the risk of damage, jamming or reduced life of the drive components.

[0035] See Figure 1 and Figure 2 As shown, the rotating support includes a sliding plate 10 that is limited to sliding within the upper base frame 1. The end of the sliding plate 10 facing the opening 6 is rotatably connected to a flip plate 7 that adsorbs the surface of the outer or inner plate. The upper surface of the flip plate 7 is provided with a negative pressure opening. Both the negative pressure opening and the adsorption plate 28 are connected to the vacuum pump through a hose. The upper base frame 1 is equipped with a transmission screw 11 driven by a forward and reverse motor. Two threaded parts on the transmission screw 11 with opposite directions are threadedly connected to the corresponding slide plate 10. The upper surface of the flap 7 has a notch at the middle edge for the pressure plate 27 to pass through. At least one positioning groove 8 is provided on both sides of the notch. The positioning groove 8 is equipped with a positioning corner block 9 that restricts the end of the outer or inner plate. The positioning groove 8 can be selected to adapt to inner and outer panels of different sizes and to reinforced sheet metal parts of corresponding sizes.

[0036] In the initial state, the two slide plates 10 are located on both sides inside the upper base frame 1 and are set far apart from each other. The outer plate and the inner plate can be placed on the upper surface of the corresponding flip plate 7, and negative pressure adsorption is formed through the negative pressure opening on the flip plate 7 under the action of the vacuum pump, so that the outer plate and the inner plate are stably held on the flip plate 7.

[0037] When the outer or inner panel is placed on the flip plate 7, its end can abut against the positioning corner block 9 set inside the positioning groove 8. The positioning corner block 9 forms an edge limiting effect on the end of the outer or inner panel, thereby initially correcting the placement position of the panel on the flip plate 7, preventing lateral displacement or end misalignment of the panel on the surface of the flip plate 7, and jointly ensuring that the placement posture of the outer or inner panel on the flip plate 7 is more accurate and stable.

[0038] After the reinforcing sheet metal part passes through the opening 6 along with the frame 5, the forward and reverse motors are activated, driving the transmission screw 11 to rotate. As the transmission screw 11 rotates, the two sliding plates 10 move synchronously towards each other within the upper base frame 1, and the two flip plates 7 also move synchronously towards the center along with the sliding plates 10. The flip plates 7, carrying the attracted outer and inner plates, gradually approach the reinforcing sheet metal part located in the center. Simultaneously, the flip plates 7 flip over. Since the thickness of the flip plates 7 is less than that of the rotating plate 12, the outer and inner plates gradually change from their initial placement posture to an assembly posture parallel to the reinforcing sheet metal part. During the movement and flipping of the flip plates 7, the outer and inner plates are less prone to slippage, rotational skew, or end-to-end movement, thus helping to maintain high assembly position accuracy.

[0039] Then, the rotating plates 12 on both sides change from an open state to a rotating and flipping state. As they rotate, the pressing parts move toward the outer and inner plates, and after passing through the corresponding notches, the adsorption plates 28 press the corresponding outer and inner plates toward the reinforcing sheet metal parts located in the middle, so that the outer plate, the reinforcing sheet metal parts and the inner plate form a stable three-layer bonding state.

[0040] See Figure 1 As shown, the conveying unit includes two linear slide rails 3, the ends of which are collinear, and the slider of each linear slide rail 3 is fixed to the corresponding stroke cylinder 4.

[0041] When the frame 5 on one linear slide rail 3 slider is used to reinforce the stable fit between the sheet metal part and the outer and inner panels, the frame 5 on the other linear slide rail 3 slider normally feeds the next reinforced sheet metal part. The rotating support parts on both sides return to their original positions after being installed in the frame 5, and continue to undertake the feeding operation of the next outer and inner panels. This allows the feeding of reinforced sheet metal parts, the feeding of outer and inner panels, and the fitting and assembly of the three to be carried out alternately and in parallel, reducing the waiting time of the process and improving the overall processing efficiency.

[0042] In use, this invention, by setting a limiting unit, allows the telescopic clamps on both sides to slide within the frame 5, and the upper limit plate 15 and lower limit plate 14 extend and retract, enabling the telescopic clamps to adapt to the limiting of reinforcing sheet metal parts of different sizes, reducing the frequency of tooling changes. After the reinforcing sheet metal part moves with the conveying unit to directly below the opening 6, the stroke cylinder 4 pushes the frame 5 upward and into the opening 6, causing the reinforcing sheet metal part to reach the height position corresponding to the height position after the rotating support is flipped. The two rotating supports change from an initial state of being far apart to a state of being close together, and 9... A 0-degree rotation transforms the outer and inner panels from their initial supporting postures to an assembly posture parallel and at the same height as the reinforcing sheet metal parts. The pressing parts move towards the outer and inner panels, enabling accurate fitting and docking of the outer panel, reinforcing sheet metal parts, and inner panel. This creates multiple limiting positions in the horizontal, vertical, and pressing directions. Multiple spot welds are then applied at positions corresponding to slot 16, allowing the outer panel, reinforcing sheet metal parts, and inner panel to be pre-welded and fixed in the fitted state. This improves the stability of the three-layer sheet metal assembly and effectively reduces misalignment, warping, and welding deviations during spot welding, thereby ensuring welding quality. By setting a limiting component, when the reinforced sheet metal part enters through the entrance of the frame 5, it first contacts the pushing slope and applies a pushing force along the sliding direction of the reset cavity to the triangular block 13. Within the allowable range, it retracts to the inside of the reset cavity, avoiding hard interference between the reinforced sheet metal part and the limiting component when entering the frame 5. This continues until its edge gradually passes the highest blocking part of the triangular block 13. The blocking part of the triangular block 13 is elastically reset by the built-in elastic element of the electromagnet 18 and extends outward, forming a locking fit with the edge of the reinforced sheet metal part, thus creating a one-way limiting effect on the reinforced sheet metal part. After installation, it restricts its reverse withdrawal or movement. When the outer and inner panels are attached, the electromagnet 18 is activated, causing the triangular block 13 to retract into the reset cavity under the magnetic attraction of the armature to reduce its protrusion and avoid interference with the attachment process of the outer and inner panels. By setting up rotating support components and pressing components, the two flip plates 7 move towards the center synchronously with the slide plate 10. The flip plates 7 carry the attracted outer and inner plates and gradually move towards the reinforcing sheet metal part located in the middle. At the same time, the flip plates 7 flip over, so that the outer and inner plates gradually change from their initial placement posture to an assembly posture parallel to the reinforcing sheet metal part. The rotating plates 12 on both sides change from an open state to a rotating and flipped state. As they rotate, the pressing components move towards the outer and inner plates. After passing through the corresponding notches, the adsorption plates 28 press the corresponding outer and inner plates against the reinforcing sheet metal part located in the middle, so that the outer plate, reinforcing sheet metal part, and inner plate form a stable three-layer bonding state. By setting up a conveying unit, when the frame 5 on one linear slide rail 3 slider is used to strengthen the stable bonding of the sheet metal parts with the outer and inner panels, the frame 5 on the other linear slide rail 3 slider normally feeds the next reinforced sheet metal part. The rotating support parts on both sides return to their original positions after being installed in the frame 5, and continue to undertake the feeding of the next outer and inner panels. This allows the feeding of reinforced sheet metal parts, the feeding of outer and inner panels, and the bonding and assembly of the three to be carried out alternately and in parallel, reducing the waiting time of the process and improving the overall processing efficiency.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A limiting device for welding sheet metal parts, comprising a lower base plate (2) and an upper base frame (1), characterized in that: The upper surface of the lower substrate (2) is provided with a conveying unit, and a stroke cylinder (4) is installed on the conveying unit. The pushing end of the stroke cylinder (4) is connected to a limiting unit for limiting the size of reinforced sheet metal parts. The limiting unit includes a frame (5) connected to the push end of the stroke cylinder (4), and telescopic clips that move in opposite directions are slidably installed on both sides of the inside of the frame (5); The telescopic clamp includes a lower limit plate (14) that is slidably installed at the bottom of the inner cavity of the frame (5), and an upper limit plate (15) that moves at the top of the inner cavity of the frame (5) is slidably installed on the top of the lower limit plate (14). The inner walls of the lower limit plate (14) and the upper limit plate (15) are both fitted with limiting members for fixing the edges of the reinforced sheet metal parts, and the surfaces of the lower limit plate (14) and the upper limit plate (15) are both provided with a number of slots (16) for spot welding. The top of the inner cavity of the frame (5) is provided with a limiting plate (20) that limits sliding in the vertical direction. The surface of the limiting plate (20) and the bottom of the inner cavity of the frame (5) are provided with limiting springs for resetting the telescopic card. The upper base frame (1) has two rotating support members that move synchronously closer or further apart. An opening (6) is formed between the two rotating support members for the frame (5) to pass through, and the two rotating support members are respectively attached to and fixed to the outer plate and the inner plate; The frame (5) is provided with pressing units at both ends to connect the outer plate and the inner plate with the reinforcing sheet metal parts. The pressing unit includes a rotating plate (12) rotatably installed on both edges of the frame (5). The end of the rotating plate (12) is provided with a pressing part.

2. The limiting device for sheet metal welding processing according to claim 1, characterized in that, The limiting spring includes a side plate (21) fixed to the end of the limiting plate (20) or fixed to the bottom of the inner cavity of the frame (5). The ends of the upper limiting plate (15) and the lower limiting plate (14) slide through the corresponding side plate (21), and a spring (23) is sleeved on one end of the upper limiting plate (15) and the lower limiting plate (14) extending into the side plate (21). The ends of the upper limiting plate (15) and the lower limiting plate (14) are provided with contact parts (24). The inner cavity of the frame (5) is provided with an upper cam roller (19) and a lower cam (25) driven by corresponding servo motors at the top and bottom, respectively. The upper cam roller (19) abuts against the upper contact part (24), and the lower cam (25) abuts against the lower contact part (24).

3. The limiting device for sheet metal welding processing according to claim 1, characterized in that, The limiting component includes a reset cavity provided on the inner wall of the lower limiting plate (14) or the upper limiting plate (15). An electromagnet (18) is installed in the reset cavity. The armature end of the electromagnet (18) is attracted and connected to a triangular block (13). The triangular block (13) slides within the corresponding reset cavity and is limited. The end of the triangular block (13) facing the entrance of the frame (5) is a pushing slope.

4. The limiting device for sheet metal welding processing according to claim 1, characterized in that, The pressing component includes a pressing cylinder (26) located at the end of a T-shaped rotating plate (12). The pushing end of the pressing cylinder (26) is connected to a pressure plate (27). An adsorption plate (28) for adsorbing the outer or inner plate is embedded in the inner side of the pressure plate (27).

5. A limiting device for sheet metal welding processing according to claim 1, characterized in that, An electric push rod (17) is installed on one side of the top of the lower limit plate (14). The pushing end of the electric push rod (17) is connected to a fixing block, and the fixing block is fixed to one side of the bottom of the upper limit plate (15). The bottom of the upper limit plate (15) is fixed with a limiting part (22) that limits sliding within a groove on the top surface of the lower limit plate (14).

6. A limiting device for sheet metal welding processing according to claim 1, characterized in that, The rotating support includes a sliding plate (10) that is limited to sliding within the upper base frame (1). The end of the sliding plate (10) facing the opening (6) is rotatably connected to a flip plate (7) that adsorbs the surface of the outer or inner plate. The upper surface of the flip plate (7) is provided with a negative pressure opening. The negative pressure opening and the adsorption plate (28) are both connected to the pressure pump through a hose. The upper base frame (1) is equipped with a transmission screw (11) driven by a forward and reverse motor. The two threaded parts on the transmission screw (11) with opposite directions are threadedly connected to the corresponding slide plate (10).

7. A limiting device for sheet metal welding processing according to claim 6, characterized in that, The upper surface of the flap (7) has a notch at the middle edge for the pressure plate (27) to pass through. At least one positioning groove (8) is provided on both sides of the notch. The positioning groove (8) is equipped with a positioning corner block (9) to restrict the end of the outer plate or inner plate.

8. A limiting device for sheet metal welding processing according to claim 1, characterized in that, The conveying unit includes two linear slide rails (3), the ends of which are collinear, and the slider of each linear slide rail (3) is fixed to the corresponding stroke cylinder (4).

Images