Automatic stainless steel coil plate welding machine

Abstract

The application belongs to the field of welding processing, in particular to a stainless steel coil plate automatic welding machine, which comprises a rack, a slide rail and a coil plate, a first sliding frame is slidably installed on the rack, a welding gun is arranged at the bottom of the first sliding frame, the welding gun is used for welding the coil plate, a second sliding frame is slidably installed on the slide rail, a distributor is fixedly connected to one side of the second sliding frame, an air inlet pipe is connected to one side of the distributor, a compressed air source is connected to the end of the air inlet pipe, three first branch pipes and the coil plate are arranged on the other side of the second sliding frame, two first branch pipes are symmetrically arranged on the two sides of the coil plate, and the other first branch pipe is arranged below the coil plate, the compressed air source is started, a plurality of clamping plates can outwardly clamp the coil plate, the outer wall of the coil plate can be additionally constrained and supported during welding, the roundness of the coil plate after welding is improved, and the ovality deviation caused by the weight during traditional coil plate welding is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of welding processing, and particularly relates to a stainless steel coil plate automatic welding machine. BACKGROUND

[0002] The stainless steel coil plate is an industrial raw material which is rolled into a coil shape after cold rolling or hot rolling of a stainless steel strip, and has excellent corrosion resistance, strength and aesthetic appearance of stainless steel, and the advantages of efficient storage and transportation and continuous processing brought by the coil form. The specification is defined by thickness, width and coil weight, and the surface can be in a variety of treatment states such as matte and bright, and is widely used in fields such as building decoration, kitchen equipment, medical devices, chemical containers and mechanical equipment manufacturing, and is an indispensable basic material for downstream manufacturing industries.

[0003] In the prior art, when a straight seam welding machine is used to weld the stainless steel coil plate, an argon arc welding process is generally used. The standard process is as follows: first, the coil plate is uncoiled and flattened, then it is coiled and the butt straight seam is closed, and the argon arc welding gun on the welding machine precisely welds the longitudinal seam under the protection of inert gas. The process can form a high-quality, non-oxidized and neat appearance weld, ensuring the sealing and structural integrity of the product, and is a core link in the manufacture of stainless steel cylinders and pipes.

[0004] In use and observation, it is found that the clamping device of the above-mentioned straight seam welding machine is generally driven by a cylinder and mainly acts on the upper end port of the coil plate for fixation; however, this clamping method causes the lower region of the coil plate to be in a suspended state, and since the stainless steel coil plate has a certain self-weight, the lower part without support will be deformed due to gravity, thereby generating a significant ovality deviation; this forming defect makes the welded cylinder not round, and therefore a special roundness correction process must be added in the subsequent process to correct the shape, increasing the production process and equipment investment and causing inconvenience in production work.

[0005] Therefore, a stainless steel coil plate automatic welding machine is proposed for the above-mentioned problems. SUMMARY

[0006] In order to make up for the deficiencies of the prior art and solve at least one technical problem proposed in the background art.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: An automatic stainless steel coil welding machine of this invention includes a frame, a slide rail, and a coil. A first sliding frame is slidably mounted on the frame; a welding torch is provided at the bottom of the first sliding frame for welding the coil; a second sliding frame is slidably mounted on the slide rail; a distributor is fixedly connected to one side of the second sliding frame; an air inlet pipe is connected to one side of the distributor; a compressed air source is connected to the end of the air inlet pipe; three first branch pipes and a coil are provided on the other side of the second sliding frame, wherein two first branch pipes are symmetrically distributed on both sides of the coil, and the other first branch pipe is located below the coil; The distributor is connected to multiple first branch pipes via pipes; multiple first sleeves are connected to the first branch pipes facing the rolled plate; a connecting rod is slidably connected inside the first sleeve; a connecting ring is fixedly provided on the inner wall of the first sleeve, and a first spring is fixedly installed between the end of the connecting rod and the fixed ring; a clamping plate is fixedly connected to the other end of the connecting rod; the side of the clamping plate facing the rolled plate is V-shaped; by activating the compressed air source, the multiple clamping plates can clamp the rolled plate outward, so that the outer wall of the rolled plate can be subjected to additional constraints and support during welding, thereby improving the roundness of the rolled plate after welding and reducing the ellipticity deviation caused by its own weight during traditional rolled plate welding.

[0008] Preferably, the second sliding frame is provided with a second branch pipe and multiple support plates on the side near the coil plate, and the second branch pipe and the distributor are connected; the support plates are evenly distributed on the inner side of the coil plate; the second branch pipe is provided with a connecting component for driving the support plates to slide; by setting multiple support plates, the support plates and clamping plates work together to provide internal and external support for the coil plate during welding, which can further improve the roundness of the coil plate during welding.

[0009] Preferably, the connecting assembly includes a second spring fixedly connected to the inner wall of the second branch pipe; a first plug is fixedly connected to the end of the second spring, and the first plug is slidably connected to the inner wall of the second branch pipe; multiple through grooves are opened on the outer wall of the second branch pipe, and connecting rods are provided in the through grooves; one end of the connecting rod is rotatably connected to the outer wall of the first plug; the other end of the connecting rod is rotatably connected to the support plate; a solenoid valve is installed on the distributor, and the solenoid valve is used to control the opening and closing of the distributor and the second branch pipe; a pressure sensor is installed on the inner wall of one of the first branch pipes, and the pressure sensor is signal connected to the solenoid valve; in the initial state, the second spring is in a pre-compressed state, that is, the first plug will approach the distributor under the elastic force of the second spring and abut against the inner wall of one side of the through groove, the connecting rod can be in a contracted state with the support plate, and the solenoid valve is also in a closed state, that is, the distributor and the second branch pipe are not connected. After the compressed air source is started, with the continuous injection of compressed air, the clamping plate can be pushed out first with the connecting rod. The coil plate is clamped outwards, and the pressure inside the air path formed by the distributor and the first branch pipe will continue to rise. During this process, the control module can continuously monitor the data fed back by the pressure sensor. When the pressure inside the air path rises to a certain value (which should be less than the maximum pressure that the air path can withstand), the control module can send a signal to drive the solenoid valve to open, so that the distributor and the second branch pipe are connected. At this time, the first plug can slide along the second branch pipe under the action of air pressure and the second spring is in a compressed state. During this process, the connecting rod will deflect and apply a thrust to the support plate, so that multiple support plates can slide along the first sleeve and move closer to the inner wall of the coil plate until multiple support plates can be in contact with the inner wall of the coil plate. It is worth mentioning that the above-mentioned monitoring of the pressure sensor and control logic of the solenoid valve by the control module can be implemented by PLC. Through the setting of the solenoid valve and pressure sensor, the inner support of the support plate and the outer clamping action of the clamping plate can be separated, thereby reducing the interference between the two moving parts.

[0010] Preferably, the first plug has an air inlet, a valve chamber, and an air outlet connected horizontally in sequence inside. The air inlet is located on the side of the first plug closer to the distributor, and the air outlet is a through groove with its end facing the surface of the second branch pipe. A third spring is fixedly connected to the bottom of the inner wall of the valve chamber. A valve plate is fixedly connected to the top of the third spring, and a fixing ring for limiting the valve plate is provided in the valve chamber. In the initial state, the third spring is in a pre-stretched state, that is, the valve plate can work together with its own weight and the elastic force of the third spring to tightly adhere to the fixing ring, thereby isolating the air inlet and the air outlet and compressing the valve. After the air source is started, it will successively squeeze and push the connecting rod and the first plug. After the clamping plate and the support plate support the roll plate, on the one hand, due to the setting of the first plug, the air passage is still in a closed state. On the other hand, the first plug has already slid under the action of air pressure, that is, the air outlet will be exposed in the through groove on the second branch pipe. The air pressure in the air passage will continue to rise until the air pressure can overcome the sealing force of the third spring and the valve plate. After the valve plate is pushed out under the action of air pressure, the air inlet, valve chamber and air outlet are connected, that is, the air passage is depressurized.

[0011] Preferably, the air outlet includes a first cavity and a second cavity that are interconnected, and the inner diameter of the second cavity is larger than that of the first cavity; the valve cavity is connected to the first cavity, and the second cavity is a through groove with its end facing the second branch pipe; a guide plate is fixed to the inner wall of the first cavity, and the guide plate is spirally arranged; the gas discharged through the air inlet and the valve cavity can pass through the first cavity and the second cavity in sequence. On the one hand, since the inner diameter of the second cavity is larger than that of the first cavity, the flow area of ​​the gas can be increased, thereby slowing down the discharged gas. On the other hand, the air passage between the valve cavity and the first cavity is arranged along the tangential direction of the first cavity. After the gas is discharged from the valve cavity, it is forced to rotate in the first cavity by the guiding effect of the guide plate, forming a vortex, which can also slow down the airflow, thereby reducing the speed and noise of the gas discharged from the air outlet and improving the quietness of the device during operation.

[0012] Preferably, a plurality of baffles are fixed to the inner wall of the second cavity; the baffles are arranged in a Z-shape; by setting a plurality of Z-shaped baffles, the contact area between the gas and the baffles in the second cavity can be maximized, the frictional energy consumption during gas flow can be increased, and the noise reduction effect of the device during operation can be enhanced.

[0013] Preferably, a suction pipe is connected to one side of the clamping plate located at the bottom of the coil, and multiple round holes are opened on the surface of the clamping plate; the end of the suction pipe is connected to a negative pressure supply device; when loading the coil, after the position of the coil is calibrated by a robot or manually, it is ensured that the welding joint of the coil and the welding gun are coaxial. The negative pressure supply device connected to the end of the round hole, specifically a vacuum pump, can be activated to adsorb and fix the coil, reducing the offset of the welding joint caused by the shaking of the coil when the bottom clamping plate lifts the coil. It is worth mentioning that the negative pressure supply device should stop working after the welding of the coil is completed.

[0014] Preferably, the inner wall of the circular hole is provided with a second plug, and the second plug is frustoconical; multiple second sleeves are fixedly connected to the inner wall of the clamp plate connected to the suction pipe; a fourth spring is fixedly installed at the bottom of the inner wall of the second sleeve and the bottom of the second plug; multiple through slots are opened in the edge area near the top of the second sleeve; initially, the fourth spring is in a pre-compressed state, that is, the second plug will slide out of the circular hole under the elastic force of the fourth spring and seal the circular hole through the end of the second plug. Before the roll plate is placed on the clamp plate and the negative pressure supply device is started, the second plug in the contact area between the roll plate and the clamp plate will slide into the second sleeve under the squeezing action of the roll plate. Figure 9 As shown, at this time, the round hole can be connected to the second sleeve and the suction pipe to adsorb the roll plate, while the round hole that is not in contact with the roll plate can continue to be sealed by the second plug to reduce the situation of the round hole sucking into the outside when the negative pressure supply equipment is started.

[0015] Preferably, an iron core is fixedly connected to the bottom of the second plug, and the iron core is slidably connected to the bottom of the second sleeve; a limiting plate is fixedly connected to the bottom of the iron core; an electromagnet is fixedly connected to the inner wall of the clamping plate connected to the suction pipe; the electromagnet and the iron core are magnetically repelled; after the coil plate is welded, the compressed air source and the negative pressure supply equipment can be stopped in sequence, and the coil plate will move down with the clamping plate and return to the initial feeding state. Since there may be a residual vacuum between the coil plate and the bottom clamping plate, that is, the coil plate will stick to the surface of the clamping plate, at this time, by energizing the electromagnet, multiple iron cores in the clamping plate will move up under the repulsive force of the electromagnet. The iron core can push the second plug to make the second plug lift the coil plate, and the limiting plate can limit the movement of the iron core to break the sticking between the coil plate and the clamping plate, so as to facilitate the subsequent removal of the coil plate by the robot or manual.

[0016] Preferably, a leveling device is fixed to the top of the second sliding frame via a mounting plate; the leveling device and the welding torch are located on the same axis; by setting up the leveling device, the accuracy of the coil plate position can be quickly determined by observing the coaxial state of the laser beam emitted by the leveling device and the welding point of the coil plate during the initial loading.

[0017] The advantages of this invention are:

[0018] 1. The stainless steel coil automatic welding machine of the present invention, by activating the compressed air source, enables multiple clamping plates to clamp the coil outward, so that the outer wall of the coil can be subjected to additional constraints and support during welding, thereby improving the roundness of the welded coil and reducing the ellipticity deviation caused by its own weight during traditional coil welding.

[0019] 2. The stainless steel coil automatic welding machine of the present invention, by setting multiple support plates, and the support plates and clamping plates working together to provide internal and external support for the coil during welding, can further improve the roundness of the coil during welding. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the main body of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the second sliding frame in this invention;

[0023] Figure 3 This is a schematic diagram of the clamping plate in this invention;

[0024] Figure 4 This is a schematic diagram of the structure of the first branch pipe in this invention;

[0025] Figure 5 This is a schematic diagram of the structure of the second branch pipe in this invention;

[0026] Figure 6 This is a schematic diagram of the support plate in this invention;

[0027] Figure 7 This is a schematic diagram of the structure of the first plug in this invention;

[0028] Figure 8 This is a schematic diagram of the inhalation tube in this invention;

[0029] Figure 9 This is a schematic diagram of the structure of the second sleeve in this invention.

[0030] In the diagram: 1. Frame; 12. First sliding frame; 13. Welding torch; 14. Second sliding frame; 15. Slide rail; 16. Distributor; 17. Inlet pipe; 18. First branch pipe; 19. First sleeve; 110. Connecting rod; 111. First spring; 112. Clamping plate; 2. Second branch pipe; 22. Support plate; 3. Second spring; 32. First plug; 33. Connecting rod; 34. Solenoid valve; 35. Pressure sensor; 4. Third spring; 42. Valve plate; 5. First cavity; 52. Second cavity; 53. Guide plate; 6. Baffle plate; 7. Inlet pipe; 72. Round hole; 8. Second plug; 82. Second sleeve; 83. Fourth spring; 9. Iron core; 92. Limiting plate; 93. Electromagnet; 10. Leveling device. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Specific embodiments are given below: Please refer to Figures 1 to 9As shown in the embodiment of the present invention, an automatic stainless steel coil welding machine includes a frame 1, a slide rail 15, and a coil. A first sliding frame 12 is slidably mounted on the frame 1. A welding torch 13 is provided at the bottom of the first sliding frame 12 for welding the coil. A second sliding frame 14 is slidably mounted on the slide rail 15. A distributor 16 is fixedly connected to one side of the second sliding frame 14. An air inlet pipe 17 is connected to one side of the distributor 16. A compressed air source is connected to the end of the air inlet pipe 17. Three first branch pipes 18 and a coil are provided on the other side of the second sliding frame 14. Two first branch pipes 18 are symmetrically distributed on both sides of the coil plate, and another first branch pipe 18 is located below the coil plate; the distributor 16 is connected to the multiple first branch pipes 18 through pipes; multiple first sleeves 19 are connected to the first branch pipes 18 facing the coil plate; a connecting rod 110 is slidably connected inside the first sleeve 19; a connecting ring is fixedly provided on the inner wall of the first sleeve 19, and a first spring 111 is fixedly installed between the end of the connecting rod 110 and the fixed ring; a clamping plate 112 is fixedly connected to the other end of the connecting rod 110; the side of the clamping plate 112 facing the coil plate is V-shaped.

[0033] During operation, the rolled plate can be placed on the bottom clamping plate 112 by a robotic arm or manually. During placement, ensure that the area of ​​the rolled plate to be welded is coaxial with the welding torch 13. Specifically, as follows... Figure 3As shown, the first spring 111 is initially in a pre-stretched state, which applies tension to the connecting rod 110, causing the end of the clamping plate 112 to be tightly pressed against the first sleeve 19. Then, by activating the compressed air source connected to the end of the air inlet pipe 17 (specifically, an air compressor or compressed air cylinder), the compressed airflow is driven through the air inlet pipe 17 and distributed to the three first branch pipes 18 via the distributor 16. The connecting rod 110 is pushed out under air pressure, and the first spring 111 is in a stretched state. When the connecting rod 110 moves, it can move radially along the first sleeve 19 along with the directly connected clamping plate 112. During this process, the bottom clamping plate 112 lifts the coil plate, while the side clamping plates 112 move closer to the coil plate. Due to three-point centering, the three clamping plates 112 can contact and support the outer wall of the coil plate, at which point the coil plate is fixed. Subsequently, The second sliding frame 14 is driven to slide along the slide rail 15. This is electrically controlled, specifically by a cylinder, until the second sliding frame 14, carrying the rolled plate, is positioned below the welding torch 13. Subsequently, the welding torch 13 can be lowered in coordination with the first sliding frame 12 sliding along the frame 1, driving the welding torch 13 to weld the seam on the surface of the rolled plate. Here, the lowering of the welding torch 13 can be controlled by a cylinder, and the radial sliding of the first sliding frame 12 along the frame 1 can be achieved by a screw and nut transmission structure. These transmission structures are all mature existing technologies, so their specific structures and principles will not be elaborated further. By activating the compressed air source, multiple clamping plates 112 can clamp the rolled plate outward, so that the outer wall of the rolled plate can be subjected to additional constraints and support during welding, thereby improving the roundness of the rolled plate after welding and reducing the ellipticity deviation caused by its own weight during traditional rolled plate welding.

[0034] Please see Figures 3 to 6 As shown, the second sliding frame 14 is provided with a second branch pipe 2 and multiple support plates 22 on the side near the coil plate. The second branch pipe 2 and the distributor 16 are connected. The support plates 22 are evenly distributed on the inner side of the coil plate. The second branch pipe 2 is provided with a connecting component for driving the support plates 22 to slide.

[0035] In the initial state, the support plate 22 is relatively close to the second branch pipe 2, which is the contracted state. After the compressed air source is started, the compressed air can enter the second branch pipe 2. As the air is continuously injected, the clamping plate 112 can first complete the outward clamping of the coil. Then the connecting component will be activated and drive multiple support plates 22 to expand, so that the support plates 22 can provide internal support to the inner wall of the coil, thereby further improving the roundness of the coil during welding. By setting multiple support plates 22, the support plates 22 and the clamping plate 112 work together to provide internal and external support for the coil during welding, which can further improve the roundness of the coil during welding.

[0036] Please see Figure 5 and Figure 6As shown, the connecting assembly includes a second spring 3 fixedly connected to the inner wall of the second branch pipe 2; a first plug 32 is fixedly connected to the end of the second spring 3, and the first plug 32 is slidably connected to the inner wall of the second branch pipe 2; multiple through grooves are opened on the outer wall of the second branch pipe 2, and connecting rods 33 are provided in the through grooves; one end of the connecting rod 33 is rotatably connected to the outer wall of the first plug 32; the other end of the connecting rod 33 is rotatably connected to the support plate 22; a solenoid valve 34 is installed on the distributor 16, and the solenoid valve 34 is used to control the opening and closing of the distributor 16 and the second branch pipe 2; a pressure sensor 35 is installed on the inner wall of one of the first branch pipes 18, and the pressure sensor 35 is signal connected to the solenoid valve 34;

[0037] Initially, the second spring 3 is in a pre-compressed state, meaning the first plug 32 will approach the distributor 16 under the elastic force of the second spring 3 and press against the inner wall of one side of the through groove. The connecting rod 33 can be in a retracted state along with the support plate 22, and the solenoid valve 34 is also in a closed state, meaning the distributor 16 and the second branch pipe 2 are not connected. After the compressed air source is started, with the continuous injection of compressed air, the clamping plate 112 can be pushed out along with the connecting rod 110 and clamp the roll plate outward. Then, the pressure in the air path formed by the distributor 16 and the first branch pipe 18 will continue to rise. During this process, the control module can continuously monitor the data fed back by the pressure sensor 35. When the pressure in the air path rises to a certain value (which should be less than the maximum pressure that the air path can withstand), the control module can send a signal to drive... When the solenoid valve 34 is opened, the distributor 16 and the second branch pipe 2 are connected. At this time, the first plug 32 can slide along the second branch pipe 2 under air pressure and compress the second spring 3. During the process, the connecting rod 33 will deflect and apply a thrust to the support plate 22, so that multiple support plates 22 can slide along the first sleeve 19 and move closer to the inner wall of the coil until multiple support plates 22 can be in contact with the inner wall of the coil. It is worth mentioning that the above-mentioned control logic for monitoring the pressure sensor 35 and controlling the solenoid valve 34 through the control module can be implemented by PLC. Through the above-mentioned setting of the solenoid valve 34 and pressure sensor 35, the inner support of the support plate 22 and the outer clamping action of the clamping plate 112 can be separated, thereby reducing the interference between the two moving parts.

[0038] Please see Figure 7 As shown, the first plug 32 has an air inlet, a valve chamber, and an air outlet connected horizontally in sequence inside. The air inlet is located on the side of the first plug 32 near the distributor 16, and the air outlet is a through groove with its end facing the surface of the second branch pipe 2. A third spring 4 is fixedly connected to the bottom of the inner wall of the valve chamber. A valve plate 42 is fixedly connected to the top of the third spring 4, and a fixing ring for limiting the valve plate 42 is provided in the valve chamber.

[0039] Initially, the third spring 4 is in a pre-stretched state, meaning that the valve plate 42, along with its own weight and the elastic force of the third spring 4, can tightly adhere to the fixing ring to isolate the air inlet and outlet. After the compressed air source is started, it will successively squeeze and push the connecting rod 110 and the first plug 32. After the clamping plate 112 and the support plate 22 successively support the roll plate, on the one hand, due to the setting of the first plug 32, the air passage is still in a closed state; on the other hand, the first plug 32 has previously slid under the action of air pressure, meaning that the air outlet will be exposed in the through groove on the second branch pipe 2. The air pressure in the air passage will continue to rise until the air pressure can overcome the sealing force of the third spring 4 and the valve plate 42. After the valve plate 42 is pushed out under the action of air pressure, the air inlet, valve chamber, and air outlet are connected, thus realizing the depressurization of the air passage.

[0040] Please see Figure 7 As shown, the air outlet includes a first cavity 5 and a second cavity 52 that are interconnected, and the inner diameter of the second cavity 52 is larger than the inner diameter of the first cavity 5; the valve chamber is connected to the first cavity 5, and the second cavity 52 is a through groove with its end facing the second branch pipe 2; a guide plate 53 is fixed to the inner wall of the first cavity 5, and the guide plate 53 is spirally arranged.

[0041] The gas discharged through the inlet and valve chamber can pass through the first cavity 5 and the second cavity 52 in sequence. On the one hand, since the inner diameter of the second cavity 52 is larger than that of the first cavity 5, the flow area of ​​the gas can be increased, thereby slowing down the discharged gas. On the other hand, the air passage between the valve chamber and the first cavity 5 is set along the tangential direction of the first cavity 5. After the gas is discharged from the valve chamber, it is forced to rotate in the first cavity 5 by the guiding effect of the guide plate 53, forming a vortex, which can also slow down the airflow, thereby reducing the speed and noise of the gas discharged from the outlet and improving the quietness of the device during operation.

[0042] Please see Figure 7 As shown, a plurality of baffles 6 are fixed to the inner wall of the second cavity 52; the baffles 6 are arranged in a Z-shape.

[0043] By setting multiple Z-shaped baffles 6, the contact area between the gas and the baffles 6 in the second cavity 52 can be maximized, increasing the frictional energy dissipation during gas flow and enhancing the noise reduction effect of the device during operation.

[0044] Please see Figure 8 As shown, a suction pipe 7 is connected to one side of the clamping plate 112 located at the bottom of the coil, and a plurality of round holes 72 are opened on the surface of the clamping plate 112; the end of the suction pipe 7 is connected to a negative pressure supply device.

[0045] When loading the coil, the position of the coil is calibrated by a robot or manually to ensure that the welding joint of the coil and the welding gun 13 are coaxial. The negative pressure supply device, which can be a vacuum pump, connected to the end of the circular hole 72 can be activated to adsorb and fix the coil, reducing the offset of the welding joint caused by the shaking of the coil when the bottom clamping plate 112 lifts the coil. It is worth mentioning that the negative pressure supply device should stop working after the coil welding is completed. In addition, in order to maximize the adsorption effect of the coil, a sponge filling layer can also be set on the clamping plate 112, similar to the sponge suction cup in the prior art. Since it is a mature existing technology, it is not shown in the figure here.

[0046] Please see Figure 8 and Figure 9 As shown, the inner wall of the circular hole 72 is provided with a second plug 8, and the second plug 8 is frustoconical; the inner wall of the clamp plate 112 connected to the suction pipe 7 is fixedly connected with a plurality of second sleeves 82; a fourth spring 83 is fixedly installed at the bottom of the inner wall of the second sleeve 82 and the bottom of the second plug 8; a plurality of through grooves are opened in the edge area near the top of the second sleeve 82.

[0047] Initially, the fourth spring 83 is in a pre-compressed state, meaning the second plug 8 will slide out of the round hole 72 under the elastic force of the fourth spring 83 and seal the round hole 72 through its end. Before placing the coil plate on the clamping plate 112 and starting the negative pressure supply device, the second plug 8 in the contact area between the coil plate and the clamping plate 112 will slide into the second sleeve 82 under the squeezing action of the coil plate. Figure 8 As shown, at this time, the round hole 72 can be connected to the suction pipe 7 through the second sleeve 82 to adsorb the roll plate, while the round hole 72 that is not in contact with the roll plate can continue to be sealed by the second plug 8 to reduce the situation of the round hole 72 sucking the outside when the negative pressure supply equipment is started.

[0048] Please see Figure 8 and Figure 9 As shown, an iron core 9 is fixedly connected to the bottom of the second plug 8, and the iron core 9 is slidably connected to the bottom of the second sleeve 82; a limit plate 92 is fixedly connected to the bottom of the iron core 9; an electromagnet 93 is fixedly connected to the inner wall of the clamp 112 connected to the suction pipe 7; the electromagnet 93 and the iron core 9 are magnetically repelled.

[0049] After the coil plate is welded, the compressed air source and negative pressure supply equipment can be stopped in sequence. The coil plate will move down with the clamping plate 112 and return to the initial feeding state. Since there may be a residual vacuum between the coil plate and the bottom clamping plate 112, the coil plate will stick to the surface of the clamping plate 112. At this time, by energizing the electromagnet 93, multiple iron cores 9 in the clamping plate 112 will move up under the repulsive force of the electromagnet 93. The iron cores 9 can push the second plug 8 to lift the coil plate. The limiting plate 92 can limit the movement of the iron cores 9 to break the sticking between the coil plate and the clamping plate 112, making it easier for the robot or manual to pick up the coil plate.

[0050] Please see Figure 3 As shown, a leveling device 10 is fixedly connected to the top of the second sliding frame 14 via a mounting plate; the leveling device 10 and the welding torch 13 are located on the same axis.

[0051] By setting up the leveling device 10, the accuracy of the coil plate position can be quickly determined by observing the laser beam emitted by the leveling device 10 and the coaxiality of the weld joint of the coil plate during the initial loading.

[0052] Working principle:

[0053] The rolled plate is placed on the bottom clamping plate 112 by a robotic arm or manually. During placement, it should be ensured that the part of the rolled plate to be welded is coaxial with the welding gun 13, as follows: Figure 3 As shown, the first spring 111 is initially in a pre-stretched state, which applies tension to the connecting rod 110, causing the end of the clamping plate 112 to press tightly against the first sleeve 19. Subsequently, by activating the compressed air source connected to the end of the air inlet pipe 17, specifically an air compressor or compressed air cylinder, the compressed airflow is driven through the air inlet pipe 17 and distributed to the three first branch pipes 18 via the distributor 16. The connecting rod 110 is pushed out under air pressure, and the first spring 111 is in a stretched state. When the connecting rod 110 moves, it can move radially along the first sleeve 19 along with the directly connected clamping plate 112. During this process, the bottom clamping plate 112 lifts the coil plate, while the side clamping plates 112 move closer to the coil plate. With the three centers centered, the three clamping plates 112 can contact the outer wall of the coil plate and support and fix it. At this time, the coil plate is in a fixed state. Then, the second sliding frame 14 can be driven to slide along the slide rail 15. This is electrically controlled, specifically, it can be driven by a cylinder, until the second sliding frame 14 carries the coil plate to the bottom of the welding torch 13. Then, the welding torch 13 can be controlled to descend and the first sliding frame 12 can be controlled to slide along the frame 1, and the welding torch 13 can be driven to weld the gap on the surface of the coil plate. Here, the descent of the welding torch 13 can be controlled by a cylinder. The first sliding frame 12 can slide along the radial direction of the frame 1 using a screw and nut pair transmission structure. The transmission structure here is a mature existing technology, so its specific structure and principle will not be described in detail.

[0054] In the initial state, the support plate 22 is relatively close to the second branch pipe 2, which is the contracted state. After the compressed air source is started, the compressed air can enter the second branch pipe 2. As the air is continuously injected, the clamping plate 112 can first complete the outward clamping of the coil. Then the connecting component will be started and drive multiple support plates 22 to expand, so that the support plates 22 can support the inner wall of the coil, thereby further improving the roundness of the coil during welding.

[0055] Initially, the second spring 3 is in a pre-compressed state, meaning the first plug 32 will approach the distributor 16 under the elastic force of the second spring 3 and press against the inner wall of one side of the through groove. The connecting rod 33 can be in a retracted state along with the support plate 22, and the solenoid valve 34 is also in a closed state, meaning the distributor 16 and the second branch pipe 2 are not connected. After the compressed air source is started, with the continuous injection of compressed air, the clamping plate 112 can be pushed out along with the connecting rod 110 and clamp the roll plate outward. Then, the pressure in the air path formed by the distributor 16 and the first branch pipe 18 will continue to rise. During this process, the control module can continuously monitor the data fed back by the pressure sensor 35. When the pressure in the air path rises to a certain value (which should be less than the maximum pressure that the air path can withstand), the control module can send a signal to drive... When the solenoid valve 34 is opened, the distributor 16 and the second branch pipe 2 are connected. At this time, the first plug 32 can slide along the second branch pipe 2 under air pressure and compress the second spring 3. During the process, the connecting rod 33 will deflect and apply a thrust to the support plate 22, so that multiple support plates 22 can slide along the first sleeve 19 and move closer to the inner wall of the coil until multiple support plates 22 can be in contact with the inner wall of the coil. It is worth mentioning that the above-mentioned monitoring of the pressure sensor 35 and control logic of the solenoid valve 34 by the control module can be implemented by PLC. With the above-mentioned setting of the solenoid valve 34 and pressure sensor 35, the inner support of the support plate 22 and the outer clamping action of the clamping plate 112 can be separated, thereby reducing the interference between the two moving parts.

[0056] In the initial state, the third spring 4 is in a pre-stretched state, that is, the valve plate 42 can work together with its own weight and the elastic force of the third spring 4 to stick tightly to the fixing ring to isolate the air inlet and the air outlet. After the compressed air source is started, it will successively squeeze and push the connecting rod 110 and the first plug 32. After the clamping plate 112 and the support plate 22 successively support the roll plate, on the one hand, due to the setting of the first plug 32, the air passage is still in a closed state. On the other hand, the first plug 32 has previously slid under the action of air pressure, that is, the air outlet will be exposed in the through groove on the second branch pipe 2. The air pressure in the air passage will continue to rise until the air pressure can overcome the sealing force of the third spring 4 and the valve plate 42. After the valve plate 42 is pushed out under the action of air pressure, the air inlet, valve cavity and air outlet are connected, that is, the air passage is depressurized.

[0057] The gas discharged through the inlet and valve chamber can pass through the first cavity 5 and the second cavity 52 in sequence. On the one hand, since the inner diameter of the second cavity 52 is larger than that of the first cavity 5, the flow area of ​​the gas can be increased, thereby slowing down the discharged gas. On the other hand, the air passage between the valve chamber and the first cavity 5 is set along the tangential direction of the first cavity 5. After the gas is discharged from the valve chamber, it is forced to rotate in the first cavity 5 by the guiding effect of the guide plate 53, forming a vortex, which can also slow down the airflow, thereby reducing the speed and noise of the gas discharged from the outlet and improving the quietness of the device during operation.

[0058] By setting multiple Z-shaped baffles 6, the contact area between the gas and the baffles 6 in the second cavity 52 can be maximized, increasing the frictional energy dissipation during gas flow, thereby enhancing the noise reduction effect of the device during operation.

[0059] When loading the coil, the position of the coil is calibrated by a robot or manually to ensure that the welding joint of the coil and the welding gun 13 are coaxial. The negative pressure supply device, which can be a vacuum pump, connected to the end of the circular hole 72 can be activated to adsorb and fix the coil, reducing the offset of the welding joint caused by the shaking of the coil when the bottom clamping plate 112 lifts the coil. It is worth mentioning that the negative pressure supply device should stop working after the coil welding is completed. In addition, in order to maximize the adsorption effect of the coil, a sponge filling layer can also be set on the clamping plate 112, similar to the sponge suction cup in the prior art. Since it is a mature existing technology, it is not shown in the figure here.

[0060] Initially, the fourth spring 83 is in a pre-compressed state, meaning the second plug 8 will slide out of the round hole 72 under the elastic force of the fourth spring 83 and seal the round hole 72 through its end. Before placing the coil plate on the clamping plate 112 and starting the negative pressure supply device, the second plug 8 in the contact area between the coil plate and the clamping plate 112 will slide into the second sleeve 82 under the squeezing action of the coil plate. Figure 9 As shown, at this time, the round hole 72 can be connected to the suction pipe 7 through the second sleeve 82 to adsorb the roll plate, while the round hole 72 that is not in contact with the roll plate can continue to be sealed by the second plug 8 to reduce the situation of the round hole 72 sucking the outside when the negative pressure supply equipment is started.

[0061] After the coil plate is welded, the compressed air source and negative pressure supply equipment can be stopped in sequence. The coil plate will move down with the clamping plate 112 and return to the initial feeding state. Since there may be a residual vacuum between the coil plate and the bottom clamping plate 112, the coil plate will stick to the surface of the clamping plate 112. At this time, the electromagnet 93 can be energized, and multiple iron cores 9 in the clamping plate 112 will move up under the repulsive force of the electromagnet 93. The iron cores 9 can push the second plug 8 to lift the coil plate. The limiting plate 92 can limit the movement of the iron cores 9 to break the sticking between the coil plate and the clamping plate 112, making it easier for the robot or manual to pick up the coil plate later.

[0062] By setting up the leveling device 10, the accuracy of the coil plate position can be quickly determined by observing the laser beam emitted by the leveling device 10 and the coaxiality of the weld joint of the coil plate during the initial loading.

[0063] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. An automatic welding machine for stainless steel coils, comprising a frame (1), a slide rail (15), and a coil, wherein a first sliding frame (12) is slidably mounted on the frame (1); a welding torch (13) is provided at the bottom of the first sliding frame (12), and the welding torch (13) is used to weld the coil; characterized in that: A second sliding frame (14) is slidably mounted on the slide rail (15); a distributor (16) is fixedly connected to one side of the second sliding frame (14); an air inlet pipe (17) is connected to one side of the distributor (16); a compressed air source is connected to the end of the air inlet pipe (17); three first branch pipes (18) and a roll plate are provided on the other side of the second sliding frame (14), two of the first branch pipes (18) are symmetrically distributed on both sides of the roll plate, and the other first branch pipe (18) is located below the roll plate; the distributor (16) and multiple The first branch pipes (18) are connected by a pipe; the first branch pipes (18) are connected to a plurality of first sleeves (19) facing the coil plate; a connecting rod (110) is slidably connected inside the first sleeve (19); a connecting ring is fixedly provided on the inner wall of the first sleeve (19), and a first spring (111) is fixedly installed between the end of the connecting rod (110) and the fixed ring; a clamping plate (112) is fixedly connected to the other end of the connecting rod (110); the side of the clamping plate (112) facing the coil plate is V-shaped; The second sliding frame (14) is provided with a second branch pipe (2) and multiple support plates (22) on the side near the roll plate. The second branch pipe (2) and the distributor (16) are connected. The support plates (22) are evenly distributed on the inner side of the roll plate. The second branch pipe (2) is provided with a connecting component for driving the support plates (22) to slide. The connecting assembly includes a second spring (3) fixedly connected to the inner wall of the second branch pipe (2); a first plug (32) is fixedly connected to the end of the second spring (3), and the first plug (32) is slidably connected to the inner wall of the second branch pipe (2); the outer wall of the second branch pipe (2) is provided with multiple through grooves, and a connecting rod (33) is provided in the through groove; one end of the connecting rod (33) is rotatably connected to the outer wall of the first plug (32); the other end of the connecting rod (33) is rotatably connected to the support plate (22); a solenoid valve (34) is installed on the distributor (16), and the solenoid valve (34) is used to control the opening and closing of the distributor (16) and the second branch pipe (2); a pressure sensor (35) is installed on the inner wall of one of the first branch pipes (18); The first plug (32) is provided with an air inlet, a valve chamber and an air outlet in a transverse sequence inside. The air inlet is located on the side of the first plug (32) close to the distributor (16), and the air outlet is a through groove with its end facing the surface of the second branch pipe (2). A third spring (4) is fixedly connected to the bottom of the inner wall of the valve chamber. A valve plate (42) is fixedly connected to the top of the third spring (4), and a fixing ring for limiting the valve plate (42) is provided in the valve chamber. The air outlet includes a first cavity (5) and a second cavity (52) that are interconnected, and the inner diameter of the second cavity (52) is larger than the inner diameter of the first cavity (5); the valve chamber is connected to the first cavity (5), and the second cavity (52) is a through groove with its end facing the second branch pipe (2); a guide plate (53) is fixed to the inner wall of the first cavity (5), and the guide plate (53) is spirally arranged; The inner wall of the second cavity (52) is fixed with a plurality of baffles (6); the baffles (6) are arranged in a Z-shape.

2. The automatic stainless steel coil welding machine according to claim 1, characterized in that: A suction pipe (7) is connected to one side of the clamping plate (112) located at the bottom of the roll plate, and multiple round holes (72) are opened on the surface of the clamping plate (112); the end of the suction pipe (7) is connected to a negative pressure supply device.

3. The automatic stainless steel coil welding machine according to claim 2, characterized in that: The inner wall of the circular hole (72) is provided with a second plug (8), and the second plug (8) is frustum-shaped; the inner wall of the clamp (112) connected to the suction pipe (7) is fixedly connected with a plurality of second sleeves (82); a fourth spring (83) is fixedly installed at the bottom of the inner wall of the second sleeve (82) and the bottom of the second plug (8); a plurality of through slots are opened in the edge area near the top of the second sleeve (82).

4. The automatic stainless steel coil welding machine according to claim 3, characterized in that: The bottom of the second plug (8) is fixedly connected to an iron core (9), and the iron core (9) is slidably connected to the bottom of the second sleeve (82); the bottom of the iron core (9) is fixedly connected to a limit plate (92); an electromagnet (93) is fixedly connected to the inner wall of the clamp (112) connected to the suction pipe (7); the electromagnet (93) and the iron core (9) are magnetically repulsive.

5. The automatic stainless steel coil welding machine according to claim 4, characterized in that: The second sliding frame (14) has a leveling device (10) fixed to its top by a mounting plate; the leveling device (10) and the welding torch (13) are located on the same axis.

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