Automatic welding apparatus using inside steel tube

An automatic welding apparatus used inside a steel tube, comprising a connecting seat and a fixing bracket, wherein the fixing bracket is fixedly connected to a rear side of the connecting seat, a roller assembly is provided at one end of the fixing bracket, a left side and a right side of the connecting seat are each fixedly connected with a first mounting bracket, and a connecting shaft is rotatably connected between the two first mounting brackets, the connecting shaft is rotatably connected with a driving wheel, and a signal transmission component is arranged on a periphery of the driving wheel;

• a laser welder is provided on an upper surface of the connecting seat, and a laser welding head is provided at one end of the laser welder;
• and the laser welder is configured to start the laser welding head according to a signal transmitted by the signal transmission component;
• wherein the upper surface of the connecting seat is fixedly connected with a motor, and one end of the connecting seat is fixedly connected with a battery pack;
• wherein an output end of the motor is fixedly connected with a first belt pulley, the first belt pulley is in driving connection with a second belt pulley through a belt, and the second belt pulley is fixedly connected to a periphery of the connecting shaft;
• wherein the signal transmission component comprises a cylindrical sleeve and a connecting rod, wherein an upper end of the connecting rod is located in the cylindrical sleeve, and the upper end of the connecting rod is slidably connected to an interior of the cylindrical sleeve, wherein a lower periphery of the connecting rod is slidably connected with a mounting pin, and a right end of the mounting pin is rotatably connected with a positioning wheel, wherein the upper end of the connecting rod is fixedly connected to a first spring, and an upper end of the first spring is fixedly connected to a top wall of the cylindrical sleeve;
• in a vertical direction, a lowest end of a periphery of the positioning wheel is lower than a lowest end of the periphery of the driving wheel;
• wherein the upper end of the connecting rod and an inner side of the top wall of the cylindrical sleeve are each fixedly connected with a signal trigger block, wherein the two signal trigger blocks are both located in the first spring and are coaxial, wherein the periphery of the connecting rod is fixedly connected with a screw rod mounting block which is perpendicular to an axis of the connecting rod, wherein a threaded hole is defined in the screw rod mounting block, a screw rod is threadedly connected to the threaded hole, and a lower end of the screw rod is directed through the threaded hole in the screw rod mounting block and is threadedly connected to a screw rod sleeve which is fixed to the mounting pin;
• the screw rod is configured to be screwed to move the positioning wheel through the screw rod sleeve and the mounting pin;
• wherein an annular groove is defined on one side of the driving wheel, and a snap-in block assembly is arranged in the annular groove, wherein a first plurality of abutting holes are defined on one of two opposite side surfaces of the annular groove, and a second plurality of abutting holes and a plurality of snapping grooves are defined on the other one of the two opposite side surfaces of the annular groove, wherein the first plurality of abutting holes, the second plurality of abutting holes and the plurality of snapping grooves are arranged along a circumferential direction of the driving wheel, wherein the second plurality of abutting holes are in one-to-one correspondence with the plurality of snapping grooves on the other side surface;
• an axis of each abutting hole is perpendicular to an axis of the corresponding snapping groove, and one end, close to the respective abutting hole, of the corresponding snapping groove is in communication with an edge of the respective abutting hole;
• wherein the snap-in block assembly comprises a connecting cylinder, an external connecting block, two abutting rods and connecting handles, wherein a periphery of the connecting cylinder is fixedly connected to the external connecting block, and a periphery of the external connecting block is fixedly connected with a snap-in block;
• the snap-in block is parallel to an axis of the external connecting block, and the snap-in block is in sliding fit with the snapping groove, a tenon fixedly connected to the cylindrical sleeve is provided at a right end of the external connecting block;
• wherein an inner wall of the connecting cylinder is fixedly connected with a baffle supporting block which is perpendicular to an axis of the connecting cylinder, an upper surface and a lower surface of the baffle supporting block are each fixedly connected with a second spring, wherein one end of each of the two second springs is fixedly connected to corresponding one of the two abutting rods;
• wherein the connecting cylinder is arranged in the annular groove, and two ends of the connecting cylinder abut against an inner wall of the annular groove, the periphery of the external connecting block abuts against the inner wall of the annular groove, and one end, away from the baffle supporting block, of each of the two abutting rods abuts against an inner wall of a corresponding abutting hole.