Color-coated sheet plasma arc welding device and welding method thereof

Abstract

The invention discloses a color-coated sheet plasma arc welding device and a welding method thereof, and relates to the related technical field of welding, the color-coated sheet plasma arc welding device comprises a rack and supports fixed to the two sides of the rack, and further comprises sliding barrels fixed to the two sides of the rack through the supports, transmission rods are vertically installed in the two sliding barrels in a sliding mode, and the transmission rods are fixed to the two sides of the rack through the supports. Sliding rods are fixed to the tops and the bottoms of the two transmission rods correspondingly, a rectangular frame is formed through the two sliding rods and the two transmission rods, the two transmission rods are installed on the two sliding rods through translation assemblies, the two lifting plates are fixed to the opposite sides of the two sliding barrels correspondingly, and the two lifting plates are driven by driving sliding sleeves and lead screws to rotate synchronously. According to the embodiment, the plasma arc welding gun ascends and descends along with the protruding form of the color-coated plate body while the sliding rod is driven to horizontally move, and compared with a driving mode of multiple air cylinders or a motor air cylinder combination, the plasma arc welding gun driving device has the advantages of being simple in structure, low in production cost and debugging cost and stable in accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field related to welding, and in particular to a plasma arc welding device for color-coated plates and a welding method thereof. Background Art

[0002] Plasma arc welding refers to a fusion welding method that utilizes the high-energy-density plasma arc beam as the welding heat source. Plasma arc welding offers concentrated energy, high productivity, fast welding speeds, minimal stress and deformation, stable arc flow, and suitability for welding thin plates and boxes. It is particularly well-suited for welding refractory, easily oxidized, and heat-sensitive metals (such as tungsten, molybdenum, copper, nickel, and titanium). The arc heats the gas, causing it to dissociate. This dissociation is then compressed as it passes through a water-cooled nozzle at high speed, increasing its energy density and dissociation, forming a plasma arc.

[0003] Plasma arc welding usually requires that the distance between the welding head of the welding gun and the welded part be kept at a specified distance. If the distance is too large or too small, it will directly affect the quality of the welding. However, due to the different shapes of objects required for welding in different fields, the distance between the welding gun head and the object will decrease or increase with the height of the object itself. Especially in color-coated plates, the most common color-coated plates are equidistant and isosceles trapezoidal ridges or depressions formed by bending the plate body.

[0004] Most existing plasma arc welding equipment is used to weld flat surfaces or objects with very small fluctuations, so that the fluctuation of the welding gun welding head during horizontal movement is very small, which has almost no effect on the welding quality. For example, the disclosed semi-automatic steel bar plasma arc welding device, application number CN116765573B; this device cannot achieve welding of color-coated plates with ridges or depressions.

[0005] Of course, existing technologies are able to achieve horizontal movement while maintaining a constant distance between the welding gun welding head and the welding object, but they are basically based on the cooperation of multiple cylinders, or the use of robotic arms. Although they can solve the above-mentioned technical problems, the costs of production, debugging, and use are high, and maintenance is relatively complicated.

[0006] Secondly, since the color-coated plate is a thin plate and is basically formed by bending to form ridges or depressions, there will inevitably be springback when bending, and this is more obvious in areas such as color-coated plates where the bending accuracy requirements are low. This springback will cause the color-coated plate to warp, which is very unfavorable for the docking work during welding. The existing technology has not provided a targeted solution to this problem. Summary of the invention

[0007] In view of the shortcomings of the existing technology, the present invention provides a plasma arc welding device and a welding method for color-coated plates, which solve the problems of high cost of robotic arms or cylinders and bending, rebound and warping of color-coated plates that are not conducive to docking.

[0008] To achieve the above object, the present invention is realized through the following technical solutions: A plasma arc welding device for color-coated plates, including a bench and brackets fixed on both sides of the bench, further including: Sliding cylinders fixed on both sides of the bench through the brackets. In both sliding cylinders, driving rods are vertically and slidably installed. At the top and bottom of the two driving rods, sliding rods are fixed. A rectangular frame is formed by the two sliding rods and the two driving rods; Two driving rods are installed on the two sliding rods through a translation assembly; Two lifting plates are respectively fixed on the opposite sides of the two sliding cylinders. On the opposite sides of the two lifting plates, lifting grooves are opened. In the lifting grooves, rollers are installed to roll along the track. On the rotating shaft of the roller, a transmission plate is rotatably installed. The roller is connected to the driving rod through a lifting assembly; A sliding sleeve that is rotatably installed on the lifting plate and slidably connected to the transmission plate is connected to the driving assembly installed on the sliding rod and the lifting plate, and the translation assembly is connected to the driving assembly; Two fitting plates are relatively fixed on the bench. On the two fitting plates, docking assemblies are installed. Between the two fitting plates, a pressing assembly is installed. The pressing assembly cooperates with the docking assembly to perform docking and pressing on the color-coated plate body.

[0009] Further, the translation assembly includes a lead screw rotatably installed on one side of the two sliding rods. On both lead screws, follower parts that are threadedly engaged therewith are sleeved. The follower parts are slidably mated with the sliding rods and are fixed with plasma arc welding torches; The two lead screws are connected by a first transmission chain, and one or / and the other lead screw is connected to the driving assembly.

[0010] Further, the driving assembly includes installation cavities opened at both ends of the sliding rod. In the installation cavities, motors are fixed. On the output shafts of the motors, second gears are coaxially fixed. On the lead screws, first gears that are meshed with the second gears are coaxially fixed; On the side of the lifting plate away from the lifting groove, a fourth gear is rotatably installed. On one side of the fourth gear, a third gear that is meshed therewith is installed. The third gear is coaxially fixed with the sliding sleeve. The fourth gear is connected to the lead screw through a second transmission chain.

[0011] Further, the lifting assembly includes a lifting part arranged in a triangular shape. The lifting part is rotatably connected to the rotating shaft of the roller; An activity groove is opened on the lifting part. In the activity groove, a stress part is slidably installed along its length direction. The stress part is fixed to the driving rod; A U-shaped guide rod is slidably mounted on the lifting member, and the guide rod is slidably engaged with a guide cylinder fixed to the bracket.

[0012] Further, the shape of the lifting groove includes, but is not limited to, an isosceles trapezoid and a triangle; The roller is tangent to the inner wall of the lifting groove.

[0013] Further, the docking assembly includes two pressing plates slidably mounted on the two attaching plates. Pressing grooves for pressing the color-coated plate body are provided at the bottoms of the two pressing plates; Moreover, a plurality of flipping grooves are equidistantly formed on the opposite sides of the two pressing plates, and a one-way flipping claw is rotatably mounted in each of the plurality of flipping grooves; Wherein, the one-way flipping claw is located on the side of the flipping groove away from the other pressing plate, and the distance between the one-way flipping claw and the attaching plate is 0.3 cm; One-way flipping claws are provided on the opposite sides of the two pressing plates.

[0014] Further, the pressing assembly includes a second clamping plate fixed between the two attaching plates. Axial guide rods are fixed on both sides of the second clamping plate. A first clamping plate is slidably mounted on the axial guide rods. Welding ports are formed on both the first clamping plate and the second clamping plate; The opposite sides of the first clamping plate and the second clamping plate are fixed with limiting blocks in a staggered manner. The limiting blocks are located on both sides of the welding port, and inclined surfaces are provided on the opposite sides of the limiting blocks on both sides of the welding port; A spring is sleeved on the axial guide rod, and the spring is located on the first clamping plate.

[0015] Further, pressing plates are fixed on the opposite sides of the two pressing plates, and arc-shaped surfaces are provided at the bottoms of the opposite sides of the two pressing plates.

[0016] In the embodiment of the present invention, the downward pressure applied to the first clamping plate in the above embodiment is realized by the spring, and the downward pressure of the spring is limited; Further, non-dry cylinders are installed on both sides of the bench, and the movable parts of the non-dry cylinders are fixed to the pressing plates.

[0017] The present invention also provides a color-coated plate plasma arc welding method, which uses the color-coated plate plasma arc welding device described above, and is characterized in that: it includes the following steps: Step 1: Place the two color-coated plates to be welded on the two attaching plates respectively and between the two pressing plates. Then, drive the relative movement of the two color-coated plate bodies by driving the relative movement of the two pressing plates; Step 2: After the two color-coated board bodies are pushed to the end, they are docked and pressed through the pressing component, so that the opposite sides of the two color-coated board bodies are abutted and overlapped; Step 3: Finally, drive the plasma arc welding torch to move horizontally, and during the movement, it moves up and down along the raised part of the color-coated board body, and keep the distance between the welding head of the plasma arc welding torch and the color-coated board body always at a specified distance.

[0018] The present invention has the following beneficial effects: 1. The color-coated board plasma arc welding device realizes the docking and conveying of the two color-coated board bodies through the cooperation of the docking component and the pressing component, and at the same time completes the pressing process of the color-coated board body during the docking and conveying to eliminate its own curling, so that the ends of the two color-coated board bodies are horizontally overlapped.

[0019] 2. The color-coated board plasma arc welding device drives the synchronous rotation of the sliding sleeve and the lead screw, so as to drive the sliding rod to move horizontally while realizing the lifting of the plasma arc welding torch along with the raised shape of the color-coated board body during the horizontal movement; This lifting can ensure that the distance between the welding head of the plasma arc welding torch and the color-coated board body is always constant; Secondly, compared with the driving methods of multiple cylinders or motor-cylinder combinations in this embodiment, it has a simple structure, low production cost and debugging cost, and high precision and stability.

[0020] 3. The color-coated board plasma arc welding device has a relatively high degree of automation, and can automatically complete the driving of the two color-coated board bodies to move relative to each other, pressing and docking required for welding. Of course, any product implementing the present invention does not necessarily need to achieve all the above-mentioned advantages at the same time. Description of the Drawings

[0021] Figure 1 is the schematic structural diagram of the whole of the present invention; Figure 2 is Figure 1 the schematic structural diagram in another direction; Figure 3 is Figure 1 the schematic structural diagram in another state; Figure 4 is Figure 3 the exploded view of; Figure 5 is the schematic structural diagram of the lifting component and the driving component in the present invention; Figure 6 is in the present invention Figure 5 the enlarged partial structural view of part A; Figure 7 is Figure 5 the schematic structural diagram from another angle; Figure 8 is the exploded view of Figure 5 ; Figure 9 This is the Figure 8 enlarged view of the local structure at position B in the present invention; Figure 10 This is the schematic structural view of the roller and the sliding sleeve in the present invention; Figure 11 This is the schematic structural view of the docking component and the pressing component in the present invention; Figure 12 This is the schematic structural view of the limiting blocks on the opposite sides of the first clamping plate and the second clamping plate in the present invention; Figure 13 This is the schematic structural view of the pressing groove in the present invention; Figure 14 is Figure 12 the schematic structural view in another direction; Figure 15 This is the schematic structural view of the one-way flipping claw in the present invention; Figure 16 This is the schematic view of the force on the push of the color-coated plate body in the present invention; Figure 17 is Figure 8 the schematic structural view in another direction; Figure 18 is Figure 17 the enlarged view of the local structure at position C in

[0022] In the figure: 1. Bench; 101. Bracket; 2. Pressing plate; 201. Flipping groove; 202. Pressing flat plate; 203. Pressing groove; 204. One-way flipping claw; 205. Arc surface; 3. Slide bar; 301. Lead screw; 302. Plasma welding gun; 303. Transmission rod; 304. Slide cylinder; 305. Follower; 306. First gear; 307. Second gear; 308. First transmission chain; 309. Force-bearing part; 3010. Lifting part; 3011. Lifting plate; 3012. Sliding sleeve; 3013. Transmission plate; 3014. Lifting groove; 3015. Guide cylinder; 3016. Guide rod; 3017. Second transmission chain; 3018. Installation cavity; 3019. Roller; 3020. Movable groove; 3021. Motor; 3022. Third gear; 3023. Fourth gear; 4. First clamping plate; 401. Second clamping plate; 402. Axial guide rod; 403. Spring; 404. Weld joint; 5. Color-coated plate body; 6. Fitting plate. Detailed implementation mode

[0023] 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] In the description of the present invention, it should be understood that the terms "open hole", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery", etc. indicating the orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0025] Next, according to Figures 1 - 18 Describe the plasma arc welding device for color coated plates provided by the embodiments of the present invention.

[0026] Please refer to Figures 1 - 18 , the embodiments of the present invention provide a plasma arc welding device for color coated plates, including a bench 1 and brackets 101 fixed on both sides of the bench 1. It also includes sliding cylinders 304 fixed on both sides of the bench 1 through the brackets 101. Transmission rods 303 are vertically and slidably installed in both sliding cylinders 304. Sliding rods 3 are fixed at the top and bottom of both transmission rods 303. A rectangular frame is formed by the two sliding rods 3 and the two transmission rods 303. This rectangular frame is actually slidably installed on the bench 1 and the brackets 101 through the two sliding cylinders 304.

[0027] The two transmission rods 303 are installed on the two sliding rods 3 through a translation assembly.

[0028] Two lifting plates 3011 are respectively fixed on the opposite sides of the two sliding cylinders 304. Lifting grooves 3014 are opened on the opposite sides of the two lifting plates 3011. Rollers 3019 are installed to roll along the track in the lifting grooves 3014. A transmission plate 3013 is rotatably installed on the rotating shaft of the roller 3019. The roller 3019 is connected to the transmission rod 303 through a lifting assembly.

[0029] A sliding sleeve 3012 rotatably installed on the lifting plate 3011 is slidably connected to the transmission plate 3013. The sliding sleeve 3012 is connected to a driving assembly installed on the sliding rod 3 and the lifting plate 3011, and the translation assembly is connected to the driving assembly; Two fitting plates 6 are relatively fixed on the bench 1. Docking assemblies are installed on both fitting plates 6. A pressing assembly is installed between the two fitting plates 6. The pressing assembly cooperates with the docking assembly to perform docking and pressing on the color coated plate body 5. <(

[0030] In an embodiment of the present invention, the two color-coated plate bodies 5 to be butted and welded are respectively placed on two fitting plates 6, and then the relative movement of the two fitting plates 6 is driven by a butting assembly. During the movement process, the fitting of the color-coated plate body 5 and the fitting plate 6 is realized, avoiding the problem of curling of the color-coated plate body 5. When the two color-coated plate bodies 5 are relatively pushed to the end of the stroke, the ends of the two color-coated plate bodies 5 are abutted, and a flattening process is carried out through a pressing assembly, avoiding the problem of dislocation when the two color-coated plate bodies 5 are butted.

[0031] Among them, when the two color-coated plate bodies 5 are completed with butting, the butting position is at the position of the welding head of the plasma arc welding gun 302. Subsequently, the driving assembly is used to drive the sliding sleeve 3012 to rotate. When the sliding sleeve 3012 rotates, the undulating roller 3019 located in the lifting groove 3014 is fluctuated by the transmission plate 3013 and rolls. This rolling has high and low undulations, and the height at different rolling positions is different. Furthermore, the lifting will drive the rectangular frame to change its height along with the position of the roller 3019. At the same time, when the driving assembly drives the sliding sleeve 3012 to rotate, it also drives the translation assembly to work, and the horizontal movement of the two plasma arc welding guns 302 is driven by the translation assembly.

[0032] The effect obtained through the above description of the motion state is that since the two plasma arc welding guns 302 are installed on the rectangular frame, and the height of the rectangular frame is controlled by the position of the roller 3019, while the two plasma arc welding guns 302 complete straight-line welding during horizontal movement, the distance between the welding heads of the two plasma arc welding guns 302 and the color-coated plate body 5 is always the optimal distance through the lifting movement of the rectangular frame.

[0033] The translation assembly includes lead screws 301 rotatably installed on the sides of two sliding rods 3. Follow-up members 305 that are threadedly engaged with the lead screws 301 are sleeved on the two lead screws 301. The follow-up members 305 are slidably engaged with the sliding rods 3, and the plasma arc welding guns 302 are fixed on the follow-up members 305.

[0034] The two lead screws 301 are connected by a first drive chain 308, and one or / and the other lead screw 301 is connected to the driving assembly.

[0035] In an embodiment of the present invention, when the driving assembly works, it drives one of the lead screws 301 to rotate, so that when one of the lead screws 301 rotates, the other lead screw 301 is driven to rotate synchronously by the first drive chain 308.

[0036] When the two lead screws 301 rotate synchronously, the two follow-up members 305 and the plasma arc welding guns 302 are synchronously driven to perform horizontal movement through the threaded engagement with the two follow-up members 305.

[0037] The driving method of the screw drive adopted to drive the plasma welding torch 302 to move horizontally has the advantages of uniform movement speed, high transmission precision, and labor-saving driving.

[0038] Secondly, compared with other axial movement mechanisms, such as cylinders or electric slide rails, the commissioning of this type of axial movement mechanism is more cumbersome, has a high maintenance cost, and the precision of axial movement is not as high as that of the screw drive method.

[0039] The driving assembly includes mounting cavities 3018 opened at both ends of the sliding rod 3. A motor 3021 is fixed in the mounting cavity 3018. A second gear 307 is coaxially fixed on the output shaft of the motor 3021, and a first gear 306 meshing with the second gear 307 is coaxially fixed on the lead screw 301.

[0040] A fourth gear 3023 is rotatably installed on the side of the lifting plate 3011 away from the lifting groove 3014. A third gear 3022 meshing with the fourth gear 3023 is installed on one side of the fourth gear 3023. The third gear 3022 is coaxially fixed with the sliding sleeve 3012. The fourth gear 3023 is connected to the lead screw 301 through a second transmission chain 3017.

[0041] In the embodiment of the present invention, when the motor 3021 works, its output shaft drives the first gear 306 to rotate through the second gear 307, so as to drive the lead screw 301 to rotate through the first gear 306. At the same time, when the lead screw 301 rotates, it also drives the fourth gear 3023 to rotate through the transmission plate 3013, so as to drive the third gear 3022 to rotate through the meshing of the fourth gear 3023 and the third gear 3022. Finally, the sliding sleeve 3012 is driven to rotate through the third gear 3022, so as to drive the lead screw 301 and the sliding sleeve 3012 to rotate synchronously when the motor 3021 works.

[0042] It should be noted that both the first gear 306 and the third gear 3022 are large gears, and the second gear 307 and the fourth gear 3023 are small gears. Therefore, both the first gear 306 and the second gear 307 and the third gear 3022 and the fourth gear 3023 reduce speed and increase torque during transmission.

[0043] The lifting assembly includes a lifting member 3010 arranged in a triangular shape. The lifting member 3010 is rotatably connected to the rotating shaft of the roller 3019.

[0044] An activity groove 3020 is opened on the lifting member 3010. A stress member 309 is slidably installed in the activity groove 3020 along its length direction. The stress member 309 is fixed to the transmission rod 303.

[0045] A U-shaped guide rod 3016 is slidably installed on the lifting member 30, and the guide rod 3016 is slidably matched with a guide cylinder 3015 fixed on the bracket 101.

[0046] In the embodiment of the present invention, the lifting member 3010 can only move in the horizontal or vertical direction under the sliding limit of the guide rod 3016, and cannot be flipped or rotated.

[0047] Since the heights and water positions of the rollers 3019 are different when the rollers 3019 roll to different positions, when the positions of the rollers 3019 change, the lifting member 3010 is driven to move vertically or horizontally. When the lifting member 3010 moves horizontally, the guide rod 3016 is stationary, and the lifting member 3010 slides horizontally on the guide rod 3016. When the lifting member 3010 moves vertically, the lifting member 3010 and the guide rod 3016 are lifted and lowered synchronously. Actually, it is the sliding of the guide rod 3016 and the guide cylinder 3015.

[0048] The "rectangular frame" is actually slidably installed in the movable groove 3020 of the lifting member 3010 through the force-bearing member 309. Since the rectangular frame is in vertical sliding fit with the sliding cylinder 304, it can only move vertically. When the lifting member 3010 moves horizontally, the lifting member 3010 and the force-bearing member 309 are in a sliding fit state. When the lifting member 3010 moves vertically, the rectangular frame will be driven to move up and down synchronously through the force-bearing member 309.

[0049] Through the above movement state, the rectangular frame and the plasma arc welding torch 302 can be lifted and lowered conformally, that is, they are lifted and lowered according to the shape of the color-coated plate body 5, so that the distance between the welding head of the plasma arc welding torch 302 and the color-coated plate body 5 is always constant.

[0050] Secondly, since the lead screw 301 and the sliding sleeve 3012 rotate synchronously, the torque when the lead screw 301 rotates is transmitted to the sliding sleeve 3012 in a way of reducing speed and increasing torque.

[0051] The effect is that when the lead screw 301 is in threaded fit with the follower 305 to drive the plasma arc welding torch 302 to move horizontally, due to the characteristics of the threaded fit, it is necessary to drive the lead screw 301 to rotate for a relatively large number of turns. The rotation of the sliding sleeve 3012 does not require as many turns as the lead screw 301, but requires a greater torque. By transmitting the force when the lead screw 301 rotates to the sliding sleeve 3012 in a way of reducing speed and increasing torque, while meeting the requirement of the lead screw 301 for multiple turns of rotation, the requirement of the sliding sleeve 3012 for a greater torque is also met.

[0052] Secondly, this embodiment has relatively high coordination. For example, when the lead screw 301 is in threaded fit with the follower 305 to drive the plasma arc welding torch 302 to move horizontally, at the same time, the rectangular frame and the plasma arc welding torch 302 are driven to gradually rise to a specified height - maintain the current height for a certain period of time - gradually drop to the specified height - maintain for a certain period of time - and then gradually rise again.

[0053] When the lead screw 301 rotates in the reverse direction, the follower 305 moves horizontally in the reverse direction accordingly. At this time, the rectangular frame and the lead screw 301 will also move in the reverse direction. Whether it is moving from the starting end of the stroke to the ending end of the stroke, or moving from the ending end of the stroke to the starting end of the stroke, or during the welding process, it will move along a specified trajectory.

[0054] The shape of the lifting groove 3014 includes, but is not limited to, an isosceles trapezoid and a triangle.

[0055] The roller 3019 is tangent to the inner wall of the lifting groove 3014.

[0056] In the embodiment of the present invention, please refer to Figure 3 , the raised part of the color-coated plate body 5 in the present invention is an isosceles trapezoid. Furthermore, the lifting groove 3014 in the present invention is provided according to the shape of the color-coated plate body 5. Of course, there are also color-coated plate bodies 5 with other raised shapes such as triangles on the market.

[0057] In specific implementation, multiple lifting plates 3011 can be produced, and the shapes of the lifting grooves 3014 on the multiple lifting plates 3011 are different, so as to be used as replacement parts of the present invention. When welding different raised color-coated plate bodies 5, lifting plates 3011 and lifting grooves 3014 with different shapes can be selected.

[0058] The docking assembly includes two pressing plates 2 slidably installed on two fitting plates 6. Pressing grooves 203 for pressing the color-coated plate body 5 are provided at the bottoms of the two pressing plates 2.

[0059] Moreover, a plurality of flipping grooves 201 are equidistantly opened on the opposite sides of the two pressing plates 2, and one-way flipping claws 204 are rotatably installed in the plurality of flipping grooves 201.

[0060] Among them, the one-way flipping claw 204 is located on the side of the flipping groove 201 away from the other pressing plate 2, and the distance between the one-way flipping claw 204 and the fitting plate 6 is 0.3 cm.

[0061] One-way flipping claws 204 are provided on the opposite sides of the two pressing plates 2.

[0062] In the embodiment of the present invention, the relative movement mechanism is used to drive the two pressing plates 2 to move relatively. When the two pressing plates 2 move relatively, the color-coated plate body 5 will enter the pressing plates 2 under the action of the one-way flipping claws 204. Since the color-coated plate body 5 has a certain curvature, when the two pressing plates 2 move relatively, it actually advances by pushing the curved part of the color-coated plate body 5. After the two color-coated plate bodies 5 both move to the ending end of the stroke, the end parts of the two color-coated plate bodies 5 are flattened by the pressing assembly, so that the end faces of the two color-coated plate bodies 5 coincide, that is, the end faces of the two color-coated plate bodies 5 are in contact.

[0063] Since the end faces of the two color-coated plate bodies 5 are abutted for limiting, as the two feeding plates 2 continue to move, the bending part of the feeding plate 2 will be flattened by the one-way flipping claws 204, and then as the feeding plate 2 continues to move, the color-coated plate body 5 will enter the feeding plate 2.

[0064] Please refer to Figure 16 , wherein, since the bending positions of the two color-coated plate bodies 5 are different, the pushing points for pushing the feeding plate 2 to move when the two feeding plates 2 move relative to each other are also different, and thus the distances for the two color-coated plate bodies 5 to move to the end of the stroke are also different.

[0065] In order to ensure that after the two feeding plates 2 are pushed to the end, the butting surfaces of the two feeding plates 2 are at the specified welding position. When the end faces of the two feeding plates 2 are at the welding position, as the two feeding plates 2 continue to move, secondary pushing is performed through the one-way flipping claws 204. Since the strokes of the two feeding plates 2 and the one-way flipping claws 204 are fixed, the feeding plate 2 is pushed into the feeding plate 2 by extrusion, thereby ensuring that the butting position of the two color-coated plate bodies 5 is at the welding position, and this butting position is directly below the plasma arc welding gun 302.

[0066] The pressing assembly includes a second clamping plate 401 fixed between two fitting plates 6. Axial guide rods 402 are fixed on both sides of the second clamping plate 401. A first clamping plate 4 is slidably mounted on the axial guide rods 402. Welding ports 404 are formed on both the first clamping plate 4 and the second clamping plate 401.

[0067] Limit blocks are fixed on the opposite sides of the first clamping plate 4 and the second clamping plate 401 in a staggered manner. The limit blocks are located on both sides of the welding port 404, and inclined surfaces are provided on the opposite sides of the limit blocks on both sides of the welding port 404.

[0068] A spring 403 is sleeved on the axial guide rod 402, and the spring 403 is located on the first clamping plate 4.

[0069] In the embodiment of the present invention, the welding port 404 is directly below the plasma arc welding gun 302, and this position is a notch for welding.

[0070] When the two color-coated plate bodies 5 move relative to each other, with the movement and the cooperation with the inclined surfaces of the limit blocks, both of the two color-coated plate bodies 5 enter between the second clamping plate 401 and the first clamping plate 4.

[0071] The initial elastic potential energy of the spring 403 gives a downward pressure to the first clamping plate 4, so that when the end of the color-coated plate body 5 is located between the first clamping plate 4 and the second clamping plate 401, it fits with the limit block, facilitating the progress of the welding work.

[0072] Pressing plates 202 are fixed on the opposite sides of the two feeding plates 2, and arc-shaped surfaces 205 are provided at the bottoms of the opposite sides of the two pressing plates 202.

[0073] In the embodiment of the present invention, the downward pressure applied to the first clamping plate 4 in the above embodiment is realized by the spring 403, and the downward pressure of the spring 403 is limited.

[0074] In this embodiment, when the two feeding plates 2 are about to move to the end of the stroke, the feeding plates 2 are driven to press down by the arc surface 205 of the flattening plate 202. And after the feeding plates 2 move below the flattening plate 202, a locking is applied to the first clamping plate 4 by the flattening plate 202, thereby ensuring that the ends of the two color-coated plate bodies 5 will not warp during welding.

[0075] The relative motion mechanism includes non-dry cylinders installed on both sides of the fixed platform 1, and the moving parts of the non-dry cylinders are fixed to the feeding plates 2.

[0076] In the embodiment of the present invention, when the non-dry cylinders move, the two feeding plates 2 are driven to move relatively or in the opposite direction by the moving parts.

[0077] Of course, a two-way lead screw cooperating with two threaded sleeves can also be used to drive the two feeding plates 2 to move relatively. Therefore, the manner or structure for driving the two color-coated plate bodies 5 to move relatively can be selected according to actual production. The present invention does not make specific limitations, as long as the driving requirements are met.

[0078] The present invention also provides a method for plasma arc welding of color-coated plates, using the plasma arc welding device for color-coated plates as described above, including the following steps: Step 1: Place the two color-coated plates to be welded respectively on two fitting plates 6 and located between the two feeding plates 2. Then, drive the relative movement of the two color-coated plate bodies 5 by driving the relative movement of the two feeding plates 2. Step 2: After the two color-coated plate bodies 5 are pushed to the end, perform docking and pressing treatment through the pressing assembly so that the opposite sides of the two color-coated plate bodies 5 are in contact and coincide. Step 3: Finally, drive the plasma arc welding torch 302 to move horizontally, and move up and down along the raised part of the color-coated plate body 5 during the movement, and keep the distance between the welding head of the plasma arc welding torch 302 and the color-coated plate body 5 at a specified distance.

[0079] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0080] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A plasma arc welding device for color-coated plates, comprising a bench (1) and brackets (101) fixed on both sides of the bench (1), characterized in that, Further included are: Sliding cylinders (304) fixed to both sides of the bench (1) through brackets (101). Transmission rods (303) are vertically and slidably installed in both sliding cylinders (304). Sliding rods (3) are fixed to the tops and bottoms of the two transmission rods (303). A rectangular frame is formed by the two sliding rods (3) and the two transmission rods (303); Two transmission rods (303) installed on the two sliding rods (3) through a translation assembly; Two lifting plates (3011) respectively fixed to opposite sides of the two sliding cylinders (304). Lifting grooves (3014) are formed on opposite sides of the two lifting plates (3011). Rollers (3019) are installed in the lifting grooves (3014) to roll along the tracks. Transmission plates (3013) are rotatably installed on the rotating shafts of the rollers (3019). The rollers (3019) are connected to the transmission rods (303) through a lifting assembly; A sliding sleeve (3012) rotatably installed on the lifting plate (3011) and slidably connected to the transmission plate (3013). The sliding sleeve (3012) is connected to a driving assembly installed on the sliding rod (3) and the lifting plate (3011), and the translation assembly is connected to the driving assembly; Two fitting plates (6) relatively fixed to the bench (1). Docking assemblies are installed on both fitting plates (6). A pressing assembly is installed between the two fitting plates (6). The pressing assembly cooperates with the docking assembly to perform docking and pressing on the color-coated plate body (5).

2. The plasma arc welding device for color-coated plates according to claim 1, characterized in that: The translation assembly includes lead screws (301) rotatably installed on one side of the two sliding rods (3). Follow-up members (305) threadedly engaged with the two lead screws (301) are sleeved on the two lead screws (301). The follow-up members (305) are slidably engaged with the sliding rods (3). Plasma welding torches (302) are fixed to the follow-up members (305); The two lead screws (301) are connected through a first transmission chain (308), and one or / and the other lead screw (301) is connected to the driving assembly.

3. The plasma arc welding device for color-coated plates according to claim 2, characterized in that: The driving assembly includes installation cavities (3018) formed at both ends of the sliding rod (3). Motors (3021) are fixed in the installation cavities (3018). Second gears (307) are coaxially fixed to the output shafts of the motors (3021). First gears (306) meshing with the second gears (307) are coaxially fixed to the lead screws (301); A fourth gear (3023) is rotatably installed on the side of the lifting plate (3011) away from the lifting groove (3014). A third gear (3022) meshing with the fourth gear (3023) is installed on one side of the fourth gear (3023). The third gear (3022) is coaxially fixed to the sliding sleeve (3012). The fourth gear (3023) is connected to the lead screw (301) through a second transmission chain (3017).

4. A plasma arc welding device for color coated plates according to claim 3, characterized in that: The lifting assembly includes a triangular lifting member (3010). The lifting member (3010) is rotatably connected to the rotating shaft of the roller (3019); An activity groove (3020) is formed in the lifting member (3010), and a stress member (309) is slidably installed in the activity groove (3020) along its length direction. The stress member (309) is fixed to the transmission rod (303). A U-shaped guide rod (3016) is slidably installed on the lifting member (3010), and the guide rod (3016) is slidably engaged with a guide cylinder (3015) fixed to the bracket (101).

5. A plasma arc welding device for color-coated plates according to claim 1, characterized in that: The shape of the lifting groove (3014) includes, but is not limited to, an isosceles trapezoid and a triangle. The roller (3019) is tangent to the inner wall of the lifting groove (3014).

6. The plasma arc welding device for color-coated plates according to claim 1, characterized in that: The docking assembly includes two pressing plates (2) slidably installed on two fitting plates (6). Pressing grooves (203) for pressing the color-coated plate body (5) are arranged at the bottoms of the two pressing plates (2). Moreover, a plurality of flipping grooves (201) are equidistantly formed on the opposite sides of the two pressing plates (2), and one-way flipping claws (204) are rotatably installed in the plurality of flipping grooves (201). Among them, the one-way flipping claw (204) is located on the side of the flipping groove (201) away from the other pressing plate (2), and the distance between the one-way flipping claw (204) and the fitting plate (6) is 0.3 cm. One-way flipping claws (204) are arranged on the opposite sides of the two pressing plates (2).

7. A plasma arc welding device for color-coated plates according to claim 6, characterized in that: The pressing assembly includes a second clamping plate (401) fixed between two fitting plates (6). Axial guide rods (402) are fixed on both sides of the second clamping plate (401). A first clamping plate (4) is slidably installed on the axial guide rods (402). Welding ports (404) are formed on both the first clamping plate (4) and the second clamping plate (401). Positioning blocks are fixedly installed on the opposite sides of the first clamping plate (4) and the second clamping plate (401) in a staggered manner. The positioning blocks are located on both sides of the welding port (404), and inclined surfaces are arranged on the opposite sides of the positioning blocks on both sides of the welding port (404). A spring (403) is sleeved on the axial guide rod (402), and the spring (403) is located on the first clamping plate (4).

8. The plasma arc welding device for color-coated plates according to claim 7, wherein: Pressing plates (202) are fixed on the opposite sides of the two pressing plates (2), and arc-shaped surfaces (205) are arranged at the bottoms of the opposite sides of the two pressing plates (202).

9. The plasma arc welding device for color coated plates according to claim 6, characterized in that: Non-drying cylinders are installed on both sides of the bench (1), and the moving parts of the non-drying cylinders are fixed to the pressing plates (2).

10. A plasma arc welding method for color-coated plates, using the plasma arc welding device for color-coated plates described in any one of claims 1-9, characterized in that: It includes the following steps: Step 1: Place the two to be welded respectively on two fitting plates (6) and between two pressing plates (2). Then, drive the relative movement of the two color-coated plate bodies (5) by driving the relative movement of the two pressing plates (2). Step 2: After the two color-coated plate bodies (5) are pushed to the end, perform docking and pressing treatment through the pressing assembly so that the opposite sides of the two color-coated plate bodies (5) are abutted and overlapped. Step 3. Finally, drive the plasma welding torch (302) to move horizontally, and during the movement, move up and down along the raised part of the color-coated plate body (5), and keep the distance between the welding head of the plasma welding torch (302) and the color-coated plate body (5) at a specified distance all the time.

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