An arc welding machine for processing liquefied gas cylinders and its operation method

Abstract

The present invention relates to the technical field of welding machines, and particularly to an arc welding machine for processing liquefied gas cylinders and its operation method, which includes a conveyor belt mechanism, a frame and a welding torch; it also includes a gantry, two rotating shafts, a first motor, a light source, a vision detection camera and a multi-functional robotic arm. The gantry is located outside the conveyor belt mechanism, and the welding torch is installed on the gantry. The gantry is rotatably installed on the frame through two rotating shafts, and the output shaft of the first motor is in transmission connection with the rotating shaft. The light source and the vision detection camera are respectively installed on the two side arms of the gantry relatively. The light source and the vision detection camera cooperate to perform vision detection on the liquefied gas cylinder. The multi-functional robotic arm is installed between the conveyor belt mechanism and the gantry. The multi-functional robotic arm respectively grabs and transfers the upper and lower parts of the liquefied gas cylinder, and adjusts the alignment state of the upper and lower parts of the liquefied gas cylinder; it can adjust the upper and lower parts of the liquefied gas cylinder according to concentricity and roundness before welding, improving the welding quality.

Description

Technical Field

[0001] The present invention relates to the technical field of welding machines, and particularly to an arc welding machine for processing liquefied gas cylinders and an operation method thereof. Background Art

[0002] Liquefied gas cylinders are usually formed by butt-welding the upper half cylinder and the lower half cylinder and then performing circumferential welding. The Chinese utility model patent with the publication number CN214721619U proposes an automatic circumferential seam welding machine for liquefied gas cylinders that can avoid the need for two pre-spot welding points for positioning to prevent detachment in existing cylinder manufacturing enterprises. Since pre-welding can affect the overall strength of the circumferential seam welding of the cylinder, avoiding spot welding can prevent problems with inconsistent strength at the pre-welding points in the overall welding strength, while saving the human resources required for manual pre-spot welding positioning and improving production efficiency; combining the bottle pressing device onto the conveyor belt improves work efficiency, and the cost is relatively lower than that of a manipulator, and it can form a production line, greatly shortening the time of the bottle loading process; due to the new structure of this equipment that eliminates pre-spot welding, it improves the quality of the circumferential seam welding of the cylinder and also reduces labor costs to fill the gap in the market.

[0003] However, the above welding machine directly aligns and presses the upper and lower parts of the liquefied gas cylinder and then directly performs circumferential welding without adjusting the upper and lower parts of the liquefied gas cylinder according to concentricity and roundness, resulting in the inability to guarantee the concentricity and roundness of the upper and lower parts of the liquefied gas cylinder after circumferential welding, so improvement is needed. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides an arc welding machine for processing liquefied gas cylinders and an operation method thereof, which can adjust the upper and lower parts of the liquefied gas cylinder according to concentricity and roundness before welding to improve the welding quality.

[0005] An arc welding machine for processing liquefied gas cylinders of the present invention includes a conveyor belt mechanism, a frame, and a welding torch. The conveyor belt mechanism is installed on the frame and is used to convey the upper and lower parts of the liquefied gas cylinder. It also includes a gantry, two rotating shafts, a first motor, a light source, a vision detection camera, and a multi-functional robotic arm. The gantry is located outside the conveyor belt mechanism. The middle of the gantry is a cross beam, and arm rods are provided at both ends of the cross beam. The welding torch is installed on the cross beam of the gantry. Rotating shafts are provided at the lower ends of the two arm rods of the gantry, and the two rotating shafts are rotatably installed on the frame. The first motor is installed on the frame, and the output shaft of the first motor is in transmission connection with the rotating shaft. The light source and the vision detection camera are respectively installed on the two arm rods of the gantry relatively. The light source and the vision detection camera cooperate to perform vision detection on the upper and lower parts of the liquefied gas cylinder. The multi-functional robotic arm is installed between the conveyor belt mechanism and the gantry. The multi-functional robotic arm respectively grabs and transfers the upper and lower parts of the liquefied gas cylinder and adjusts the alignment state of the upper and lower parts of the liquefied gas cylinder. During operation, the conveyor belt mechanism conveys the upper and lower parts of the liquefied gas cylinder backward. When the upper and lower parts of the liquefied gas cylinder reach the designated position, the conveyor belt mechanism stops. The multi-functional robotic arm rotates to grab the upper and lower parts of the liquefied gas cylinder, and the multi-functional robotic arm rotates in reverse to transfer the upper and lower parts of the liquefied gas cylinder to the lower part of the gantry. At this time, the two rotating shafts are concentrically aligned with the upper and lower parts of the liquefied gas cylinder. The light source is turned on to irradiate the ends of the upper and lower parts of the liquefied gas cylinder. The vision detection camera performs vision detection on the upper and lower parts of the liquefied gas cylinder by comparing the bright and dark parts of the edges of the upper and lower parts of the liquefied gas cylinder. The first motor drives the gantry to rotate slowly through the rotating shaft to perform overall detection on the upper and lower parts of the liquefied gas cylinder. After the detection is completed, according to the detection results, the multi-functional robotic arm drives the upper or lower part of the liquefied gas cylinder to rotate, so as to adjust the concentricity and roundness of the upper and lower parts. When the upper and lower parts are adjusted to the best state, the multi-functional robotic arm locks the upper and lower parts of the liquefied gas cylinder. The welding torch is turned on to weld the weld between the upper and lower parts. The gantry rotates under the drive of the first motor to perform circumferential welding on the weld until it is blocked by the multi-functional robotic arm. The gantry rotates to make the welding torch reach the vertical state. The multi-functional robotic arm releases the lock on the upper and lower parts of the liquefied gas cylinder. The multi-functional robotic arm drives the upper and lower parts of the semi-welded liquefied gas cylinder to rotate slowly, so that the welding torch performs circumferential full welding on the weld. After the welding is completed, the multi-functional robotic arm operates to place the liquefied gas cylinder back on the conveyor belt mechanism, and the conveyor belt mechanism conveys the liquefied gas cylinder to the next working station. Compared with the prior art, it can adjust the upper and lower parts of the liquefied gas cylinder according to the concentricity and roundness before welding, and then perform welding after adjusting to the best state, so as to ensure the concentricity and roundness of the upper and lower parts of the liquefied gas cylinder after circumferential welding and improve the welding quality.

[0006] Preferably, it also includes a smoke hood, a push cylinder and a sliding rod, the welding gun is installed in the smoke hood, the fixed end of the push cylinder is installed on the crossbeam of the door frame, the piston rod of the push cylinder is connected to the smoke hood, the smoke hood is located on the inner side of the door frame, the sliding rod is installed on the smoke hood, and the sliding rod is slidably connected to the crossbeam of the door frame; when the upper and lower parts of the liquefied gas cylinder are adjusted, the piston rod of the push cylinder is extended to push the smoke hood downward, so that the virtual cover of the smoke hood is buckled on the upper and lower outer walls of the liquefied gas cylinder, so that the welding gun is aligned with the weld, and the sliding rod slides and guides the smoke hood, and an exhaust pipe can be installed on the smoke hood to extract the smoke concentrated in the smoke hood, thereby improving environmental protection.

[0007] Preferably, the multifunctional robotic arm includes a shaft, a second motor, an arm plate, an arm plate, a middle frame, a double-headed push cylinder, multiple electric wheels and multiple adsorption components, the shaft is rotatably mounted on the frame, the shaft is located between the conveyor belt mechanism and the door frame, a spline is provided on the outer wall of the shaft, the second motor is mounted on the frame, the output shaft of the second motor is transmission-connected to the shaft, the inner end of the arm plate is slidably fitted with the shaft through a spline hole, and the inner end of the arm plate is slidably fitted with the shaft through a spline hole, and multiple electric wheels and multiple adsorption components are installed on the arm plate one and the arm plate, one end of the middle frame is mounted on the shaft, the middle frame is located between the arm plate one and the arm plate, the fixed end of the double-headed push cylinder is mounted on the middle frame, and the two piston rods of the double-headed push cylinder are respectively connected to the arm plate one and the arm plate; the second motor drives the shaft to rotate, and the shaft drives the arm plate one and the arm plate to rotate to the liquefied gas cylinder on the conveyor belt mechanism through the cooperation of the spline and the spline hole. The upper and lower parts of the liquefied gas cylinder are respectively in rolling contact with the upper and lower parts of the liquefied gas cylinder. At the same time, the multiple adsorption components adsorb the upper and lower parts of the liquefied gas cylinder, and the second motor drives the shaft to reverse, and transfers the upper and lower parts of the liquefied gas cylinder to the bottom of the gantry. At this time, the multiple electric wheels roll and support the upper and lower parts of the liquefied gas cylinder. At this time, the multiple adsorption components loosen the upper and lower parts of the liquefied gas cylinder, and the multiple electric wheels rotate to drive the upper and lower parts of the liquefied gas cylinder to rotate relative to each other, so as to adjust the alignment state of the upper and lower parts of the liquefied gas cylinder. After the adjustment is complete, the multiple adsorption components adsorb the upper and lower parts of the liquefied gas cylinder again, and the two piston rods of the double-head push cylinder synchronously contract to align and press the upper and lower parts of the liquefied gas cylinder, thereby eliminating the step of pre-spot welding, which is beneficial to maintaining the welding strength of the liquefied gas cylinder. It has multiple functions and good practicality.

[0008] Preferably, it also includes a bracket and a positioning slot, the bracket is installed on the frame, the bracket is located between the shaft and the door frame, the positioning slot is installed on the bracket, the bracket supports and lifts the middle frame, and the positioning slot holds both sides of the middle frame; when the upper and lower parts of the liquefied gas cylinder are transferred to the bottom of the door frame, the bracket supports and lifts the middle frame, and the positioning slot holds both sides of the middle frame, thereby positioning the middle frame and improving the positioning accuracy of the upper and lower parts of the liquefied gas cylinder.

[0009] Preferably, the adsorption assembly includes a permanent magnet and an electromagnet. The permanent magnet is mounted on the lower end surface of the first arm plate or the arm plate through a bracket. The electromagnet is slidably mounted on the first arm plate or the arm plate, and the electromagnet is aligned with the permanent magnet. An electromagnetic wire core is installed inside the electromagnet, and the polarities of the opposite ends of the electromagnet and the permanent magnet are opposite. When it is necessary to adsorb the liquefied gas cylinder, the electromagnetic wire core of the electromagnet is energized to generate magnetism. Since the polarities of the opposite faces of the electromagnet and the permanent magnet are opposite, the electromagnet is pushed upward to the first arm plate or the arm plate, so that the end of the electromagnet away from the permanent magnet adsorbs the liquefied gas cylinder. When it is necessary to release the liquefied gas cylinder, the electromagnetic wire core of the electromagnet is de-energized to eliminate magnetism, and the permanent magnet adsorbs the electromagnet, so that the electromagnet contracts downward to the first arm plate or the arm plate, so that the end of the electromagnet away from the permanent magnet releases and moves away from the liquefied gas cylinder, which will not interfere with the rotation of the liquefied gas cylinder, and there is no need to set up a telescopic mechanism, with a simple structure and good practicability.

[0010] Preferably, it further includes a plurality of wheel brackets and a plurality of bolt assemblies. A plurality of electric wheels are respectively rotatably mounted on the plurality of wheel brackets, and the plurality of bolt assemblies respectively pass through the mounting holes of the plurality of wheel brackets to mount the plurality of wheel brackets on the first arm plate and the arm plate respectively. By adjusting the relative positions of the plurality of bolt assemblies and the mounting holes of the plurality of wheel brackets, the relative distances between the plurality of electric wheels and the first arm plate and the arm plate are adjusted, so as to improve the rolling support accuracy of the plurality of electric wheels for the upper and lower parts of the liquefied gas cylinder.

[0011] Preferably, it further includes an arm rod, a third push cylinder and a functional component. One end of the arm rod is rotatably mounted on the middle frame, one end of the third push cylinder is rotatably connected to the middle of the arm rod, the other end of the third push cylinder is rotatably connected to the middle frame, and the other end of the arm rod is mounted with the functional component, and the functional component is aligned with the welds on the upper and lower parts of the liquefied gas cylinder. When performing circumferential welding on the liquefied gas cylinder, the piston rod of the third push cylinder extends to lift the arm rod, so that the functional component presses on the weld of the liquefied gas cylinder, and the functional component processes the weld to improve functionality.

[0012] Preferably, the functional component is one or a combination of a spray gun, a grinding wheel, and a wire wheel. When the functional component is a spray gun, it can perform heat treatment such as preheating and heating on the weld to eliminate stress. When the functional component is a grinding wheel or a wire wheel, it can perform grinding and slag removal on the weld to improve the welding quality.

[0013] Preferably, it further includes a lever, a spring, a contact switch, a column and a stop bar. The inner end of the lever is rotatably sleeved on the shaft rod, and the inner end of the lever is elastically mounted on the shaft rod through the spring. The outer end of the lever extends above the conveyor belt mechanism, and the contact switch is mounted at the outer end of the lever. The column is mounted on the frame, and the stop bar is mounted on the column. The stop bar limits and blocks the lever. The lever is elastically and rotatably mounted on the shaft rod through the spring. When the shaft rod drives the first arm plate and the arm plate to rotate to the vertical position, the shaft rod drives the lever and the contact switch to rotate above the conveyor belt mechanism through the spring. At this time, the lever is blocked by the stop bar. When the liquefied gas cylinder transported on the conveyor belt mechanism is blocked by the contact switch, the contact switch sends an electrical signal to the controller of the conveyor belt mechanism, causing the conveyor belt mechanism to stop. At this time, the second motor operates to drive the shaft rod to rotate, and starts to grab and transfer the liquefied gas cylinder, and the spring is twisted and stored with force. When the second motor drives the shaft rod to reverse and transfer the liquefied gas cylinder to the gantry, the spring releases and drives the lever to flip and move from the conveyor belt mechanism to the gantry, avoiding the lever interfering with the backward transportation of the liquefied gas cylinder on the conveyor belt mechanism and improving the degree of automation.

[0014] The operation method of an arc welding machine for processing liquefied gas cylinders of the present invention is as follows:

[0015] S1. Transport the upper and lower parts of the liquefied gas cylinder through the conveyor belt mechanism. The contact switch blocks the upper and lower parts of the liquefied gas cylinder, and the contact switch sends an electrical signal to the controller of the conveyor belt mechanism to stop the conveyor belt mechanism;

[0016] S2. Operate the second motor to drive the shaft rod to rotate. The shaft rod drives the first arm plate, the arm plate and the middle frame to turn over and buckle above the upper and lower parts of the liquefied gas cylinder, so that the first arm plate and the arm plate are respectively aligned with the upper and lower parts of the liquefied gas cylinder, and the electromagnetic cores of multiple electromagnets are energized to adsorb the upper and lower parts of the liquefied gas cylinder;

[0017] S3. Operate the second motor to drive the shaft rod to reverse. The shaft rod drives the first arm plate, the arm plate and the middle frame to rotate below the gantry. The bracket and the positioning card slot lift and position the middle frame, and the electromagnetic cores of multiple electromagnets are de-energized to release the upper and lower parts of the liquefied gas cylinder;

[0018] S4. Turn on the light source and the vision detection camera. The first motor drives the gantry to rotate through the rotating shaft, so that the light source and the vision detection camera cooperate to perform vision detection on the upper and lower parts of the liquefied gas cylinder, detect the roundness and concentricity of the upper and lower parts of the liquefied gas cylinder. Multiple electric wheels rotate to drive the upper and lower parts of the liquefied gas cylinder to rotate relative to each other, adjust the overall roundness and concentricity of the upper and lower parts of the liquefied gas cylinder to the best state, and the electromagnetic cores of multiple electromagnets are energized again to adsorb the upper and lower parts of the liquefied gas cylinder. Operate the two piston rods of the double-headed push cylinder to contract, so that the butting joints of the upper and lower parts of the liquefied gas cylinder are tightened;

[0019] S5. The piston rod of the pushing cylinder extends, and the smoke collecting hood is placed loosely on the outer walls of the upper and lower parts of the liquefied gas cylinder, so that the welding torch is aligned with the weld seam. Operate the first motor to drive the gantry to rotate through the rotating shaft, so that the welding torch performs partial circumferential welding on the butt joints of the upper and lower parts of the liquefied gas cylinder;

[0020] S6. The multiple electromagnets release the upper and lower parts of the liquefied gas cylinder, and the multiple electric wheels rotate to drive the partially circumferentially welded liquefied gas cylinder to rotate slowly, so that the welding torch performs full circumferential welding on the weld seam of the liquefied gas cylinder. At the same time, operate the third pushing cylinder to extend so that the functional component grinds the weld seam;

[0021] S7. Operate the second motor to drive the shaft rod to reverse to place the liquefied gas cylinder with circumferential welding completed back on the conveyor belt mechanism. Operate the second motor to drive the shaft rod to drive the first arm plate and the arm plate to reset, and the conveyor belt mechanism conveys the liquefied gas cylinder with circumferential welding completed to the next working station.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: It can adjust the upper and lower parts of the liquefied gas cylinder according to the concentricity and roundness before welding. After adjusting to the best state, welding is carried out, so that the concentricity and roundness after circumferential welding of the upper and lower parts of the liquefied gas cylinder are guaranteed, and the welding quality is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of the present invention;

[0024] Figure 2 is a schematic side-sectional structural diagram of the present invention;

[0025] Figure 3 is a schematic structural diagram of the state where the liquefied gas cylinder of the present invention reaches the designated position;

[0026] Figure 4 is a schematic structural diagram of the state of grasping the liquefied gas cylinder of the present invention;

[0027] Figure 5 is a schematic structural diagram of the state of welding the liquefied gas cylinder of the present invention;

[0028] Figure 6 is a schematic structural diagram of structures such as the frame, welding torch, gantry, first motor, light source, vision detection camera, and smoke collecting hood;

[0029] Figure 7 is an axonometric structural diagram of structures such as the multi-functional robotic arm;

[0030] Figure 8 is a bottom axonometric structural diagram of structures such as the multi-functional robotic arm;

[0031] Figure 9 is Figure 2 a partial enlarged structural diagram at position A in

[0032] Reference numerals in the drawings: 1, conveyor belt mechanism; 2, frame; 3, welding torch; 4, gantry; 5, rotating shaft; 6, first motor; 7, light source; 8, vision inspection camera; 9, smoke hood; 10, push cylinder; 11, sliding rod; 12, shaft rod; 13, second motor; 14, first arm plate; 15, arm plate; 16, middle frame; 17, double-headed push cylinder; 18, permanent magnet; 19, electromagnet; 20, electric wheel; 21, wheel frame; 22, bolt assembly; 23, arm rod; 24, third push cylinder; 25, functional component; 26, bracket; 27, positioning card slot; 28, lever; 29, spring; 30, contact switch component; 31, column; 32, stop bar. Detailed implementation manners

[0033] For ease of understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0034] Embodiment 1

[0035] As Figures 1 to 6 shown, an arc welding machine for processing liquefied gas cylinders includes a conveyor belt mechanism 1, a frame 2, and a welding torch 3. The conveyor belt mechanism 1 is installed on the frame 2, and the conveyor belt mechanism 1 is used to convey the upper and lower parts of the liquefied gas cylinder. It also includes a gantry 4, two rotating shafts 5, a first motor 6, a light source 7, a vision inspection camera 8, and a multi-functional robotic arm. The gantry 4 is located outside the conveyor belt mechanism 1. The middle part of the gantry 4 is a cross beam, and arm rods are provided at both ends of the cross beam. The welding torch 3 is installed on the cross beam of the gantry 4. Rotating shafts 5 are provided at the lower ends of the two arm rods of the gantry 4, and the two rotating shafts 5 are rotatably installed on the frame 2. The first motor 6 is installed on the frame 2, and the output shaft of the first motor 6 is in transmission connection with the rotating shaft 5. The light source 7 and the vision inspection camera 8 are respectively installed opposite to each other on the two arm rods of the gantry 4. The light source 7 and the vision inspection camera 8 cooperate to perform vision inspection on the upper and lower parts of the liquefied gas cylinder. The multi-functional robotic arm is installed between the conveyor belt mechanism 1 and the gantry 4. The multi-functional robotic arm respectively grabs and transfers the upper and lower parts of the liquefied gas cylinder and adjusts the alignment state of the upper and lower parts of the liquefied gas cylinder. It also includes a smoke hood 9, a push cylinder 10, and a sliding rod 11. The welding torch 3 is installed in the smoke hood 9. The fixed end of the push cylinder 10 is installed on the cross beam of the gantry 4, and the piston rod of the push cylinder 10 is connected to the smoke hood 9. The smoke hood 9 is located inside the gantry 4. The sliding rod 11 is installed on the smoke hood 9, and the sliding rod 11 is slidably connected to the cross beam of the gantry 4.

[0036] During operation, the conveyor belt mechanism 1 conveys the upper and lower parts of the liquefied gas cylinder backward. When the upper and lower parts of the liquefied gas cylinder reach the specified positions, the conveyor belt mechanism 1 stops. The multi-functional robotic arm rotates to grasp the upper and lower parts of the liquefied gas cylinder, and the multi-functional robotic arm reverses to transfer the upper and lower parts of the liquefied gas cylinder to the lower part of the gantry 4. At this time, the two rotating shafts 5 are concentrically aligned with the upper and lower parts of the liquefied gas cylinder. The light source 7 is turned on to irradiate the ends of the upper and lower parts of the liquefied gas cylinder. The vision detection camera 8 performs visual detection on the upper and lower parts of the liquefied gas cylinder by comparing the bright and dark parts of the edges of the upper and lower parts of the liquefied gas cylinder. The first motor 6 drives the gantry 4 to slowly rotate through the rotating shaft 5 to perform overall detection on the upper and lower parts of the liquefied gas cylinder. After the detection is completed, according to the detection results, the multi-functional robotic arm drives the upper or lower part of the liquefied gas cylinder to rotate, so as to adjust the concentricity and roundness of the upper and lower parts. When the upper and lower parts are adjusted to the best, the multi-functional robotic arm locks the upper and lower parts of the liquefied gas cylinder. The piston rod of the push cylinder 10 extends to push the smoke hood 9 downward, so that the smoke hood 9 is loosely buckled on the outer walls of the upper and lower parts of the liquefied gas cylinder, so that the welding torch 3 is aligned with the weld seam. The slide bar 11 guides the sliding of the smoke hood 9. The welding torch 3 is turned on to weld the weld seam between the upper and lower parts. An exhaust pipe can be installed on the smoke hood 9 to extract the concentrated smoke in the smoke hood 9, improving environmental protection. The gantry 4 rotates under the drive of the first motor 6 to perform circumferential welding on the weld seam until it is blocked by the multi-functional robotic arm. The gantry 4 rotates to make the welding torch 3 reach the vertical state. The multi-functional robotic arm releases the lock on the upper and lower parts of the liquefied gas cylinder. The multi-functional robotic arm drives the upper and lower parts of the semi-welded liquefied gas cylinder to slowly rotate, so that the welding torch 3 performs circumferential full welding on the weld seam. After the welding is completed, the multi-functional robotic arm operates to place the liquefied gas cylinder back on the conveyor belt mechanism 1, and the conveyor belt mechanism 1 conveys the liquefied gas cylinder to the next working station. Compared with the prior art, it is possible to adjust the upper and lower parts of the liquefied gas cylinder according to the concentricity and roundness before welding, and then perform welding after adjusting to the best, so that the concentricity and roundness after circumferential welding of the upper and lower parts of the liquefied gas cylinder are guaranteed, improving the welding quality.

[0037] Embodiment 2

[0038] Such as Figures 7 to 9As shown, on the basis of Embodiments 1 to 3, the multi-functional robotic arm includes a shaft rod 12, a second motor 13, a first arm plate 14, an arm plate 15, a middle frame 16, a double-headed push cylinder 17, a plurality of electric wheels 20, and a plurality of adsorption components. The shaft rod 12 is rotatably installed on the frame 2. The shaft rod 12 is located between the conveyor belt mechanism 1 and the gantry 4. A spline is provided on the outer wall of the shaft rod 12. The second motor 13 is installed on the frame 2. The output shaft of the second motor 13 is in transmission connection with the shaft rod 12. The inner end of the first arm plate 14 is slidably sleeved on the shaft rod 12 through a spline hole. The inner end of the arm plate 15 is slidably sleeved on the shaft rod 12 through a spline hole. A plurality of electric wheels 20 and a plurality of adsorption components are installed on both the first arm plate 14 and the arm plate 15. One end of the middle frame 16 is installed on the shaft rod 12. The middle frame 16 is located between the first arm plate 14 and the arm plate 15. The fixed end of the double-headed push cylinder 17 is installed on the middle frame 16. The two piston rods of the double-headed push cylinder 17 are respectively connected to the first arm plate 14 and the arm plate 15; It also includes a bracket 26 and a positioning slot 27. The bracket 26 is installed on the frame 2. The bracket 26 is located between the shaft rod 12 and the gantry 4. The positioning slot 27 is installed on the bracket 26. The bracket 26 supports and holds the middle frame 16. The positioning slot 27 clamps both sides of the middle frame 16; The adsorption component includes a permanent magnet 18 and an electromagnet 19. The permanent magnet 18 is installed on the lower end face of the first arm plate 14 or the arm plate 15 through a bracket. The electromagnet 19 is slidably installed on the first arm plate 14 or the arm plate 15. The electromagnet 19 is aligned with the permanent magnet 18. An electromagnetic wire core is installed inside the electromagnet 19. The polarities of the opposite ends of the electromagnet 19 and the permanent magnet 18 are opposite; It also includes a plurality of wheel frames 21 and a plurality of bolt assemblies 22. The plurality of electric wheels 20 are respectively rotatably installed on the plurality of wheel frames 21. The plurality of bolt assemblies 22 respectively pass through the mounting holes of the plurality of wheel frames 21 to install the plurality of wheel frames 21 on the first arm plate 14 and the arm plate 15 respectively; It also includes an arm rod 23, a third push cylinder 24, and a functional component 25. One end of the arm rod 23 is rotatably installed on the middle frame 16. One end of the third push cylinder 24 is rotatably connected to the middle of the arm rod 23. The other end of the third push cylinder 24 is rotatably connected to the middle frame 16. The other end of the arm rod 23 is installed with the functional component 25. The functional component 25 is aligned with the welds on the upper and lower parts of the liquefied gas cylinder; The functional component 25 is one or a combination of a spray gun, a grinding wheel, and a wire wheel.

[0039] By adjusting the relative positions of multiple bolt assemblies 22 and the mounting holes of multiple wheel brackets 21, the relative distances between multiple electric wheels 20 and arm plate 1 14 and arm plate 15 are adjusted, improving the precision of the rolling support of multiple electric wheels 20 for the upper and lower parts of the liquefied gas cylinder. When it is necessary to adsorb the liquefied gas cylinder, the electromagnetic core of the electromagnet 19 is energized to generate magnetism. Since the polarities of the surfaces of the electromagnet 19 opposite to the permanent magnet 18 are opposite, the electromagnet 19 is pushed out towards the upper part of arm plate 1 14 or arm plate 15, causing the end of the electromagnet 19 away from the permanent magnet 18 to adsorb the liquefied gas cylinder. When it is necessary to release the liquefied gas cylinder, the electromagnetic core of the electromagnet 19 is de-energized to eliminate magnetism, and the magnetism of the permanent magnet 18 adsorbs the electromagnet 19, causing the electromagnet 19 to contract towards the lower part of arm plate 1 14 or arm plate 15, making the end of the electromagnet 19 away from the permanent magnet 18 release and move away from the liquefied gas cylinder, without interfering with the rotation of the liquefied gas cylinder and without the need to set up a telescopic mechanism, with a simple structure. The motor 2 13 drives the shaft rod 12 to rotate. The shaft rod 12 drives arm plate 1 14 and arm plate 15 to rotate to above the upper and lower parts of the liquefied gas cylinder on the conveyor belt mechanism 1 through the cooperation of the spline and the spline hole, and makes multiple electric wheels 20 respectively roll into contact with the upper and lower parts of the liquefied gas cylinder. At the same time, multiple electromagnets 19 adsorb the upper and lower parts of the liquefied gas cylinder. The motor 2 13 drives the shaft rod 12 to reverse, transferring the upper and lower parts of the liquefied gas cylinder to below the gantry 4. The bracket 26 supports and lifts the middle frame 16, and at the same time, the positioning card slots 27 hold both sides of the middle frame 16, thereby positioning the middle frame 16 and improving the positioning precision of the upper and lower parts of the liquefied gas cylinder. At this time, multiple electric wheels 20 roll to support the upper and lower parts of the liquefied gas cylinder. At this time, multiple electromagnets 19 release the upper and lower parts of the liquefied gas cylinder. Multiple electric wheels 20 rotate to drive the upper and lower parts of the liquefied gas cylinder to rotate relatively, realizing the adjustment of the alignment state of the upper and lower parts of the liquefied gas cylinder. After the adjustment is completed, multiple electromagnets 19 adsorb the upper and lower parts of the liquefied gas cylinder again. The two piston rods of the double-headed push cylinder 17 contract synchronously to align and press the upper and lower parts of the liquefied gas cylinder tightly, thus eliminating the need for pre-spot welding, which is beneficial to maintaining the welding strength of the liquefied gas cylinder. When performing circumferential welding on the liquefied gas cylinder, the piston rod of the push cylinder 3 24 extends to lift the arm rod 23, causing the functional component to press against the weld of the liquefied gas cylinder. The functional component processes the weld, improving functionality. When the functional component 25 is a spray gun, it can perform heat treatment such as preheating and heating on the weld to eliminate stress; when the functional component 25 is a grinding wheel or a wire wheel, it can perform grinding and slag removal on the weld, improving the welding quality.

[0040] Embodiment 3

[0041] Such as Figures 1 to 5 、 Figure 7 and Figure 8As shown, on the basis of Embodiment 2, it further includes a lever 28, a spring 29, a contact switch member 30, a column 31 and a stop lever 32. The inner end of the lever 28 is rotatably sleeved on the shaft rod 12, and the inner end of the lever 28 is elastically mounted on the shaft rod 12 through the spring 29. The outer end of the lever 28 extends above the conveyor belt mechanism 1, and the contact switch member 30 is installed at the outer end of the lever 28. The column 31 is installed on the frame 2, and the stop lever 32 is installed on the column 31. The stop lever 32 limits and blocks the lever 28.

[0042] The lever 28 is elastically and rotatably mounted on the shaft rod 12 through the spring 29. When the shaft rod 12 drives the first arm plate 14 and the arm plate 15 to rotate to the vertical position, the shaft rod 12 drives the lever 28 and the contact switch member 30 to rotate above the conveyor belt mechanism 1 through the spring 29. At this time, the lever 28 is blocked by the stop lever 32. When the liquefied gas cylinder transported on the conveyor belt mechanism 1 is blocked by the contact switch member 30, the contact switch member 30 sends an electrical signal to the controller of the conveyor belt mechanism 1, causing the conveyor belt mechanism 1 to stop. At this time, the second motor 13 operates to drive the shaft rod 12 to rotate, and starts to grab and transfer the liquefied gas cylinder, and the spring 29 is twisted and stores energy. When the second motor 13 drives the shaft rod 12 to reverse and transfer the liquefied gas cylinder to the gantry 4, the spring 29 releases and drives the lever 28 to flip and move from the conveyor belt mechanism 1 to the gantry 4, avoiding the lever 28 from interfering with the backward transportation of the liquefied gas cylinder on the conveyor belt mechanism 1 and improving the degree of automation.

[0043] Embodiment 4

[0044] As Figures 1 to 9 shown, on the basis of Embodiments 1 to 3, the operation method of the arc welding machine for processing liquefied gas cylinders is as follows:

[0045] S1. Transport the upper and lower parts of the liquefied gas cylinder through the conveyor belt mechanism 1. The contact switch member 30 blocks the upper and lower parts of the liquefied gas cylinder, and the contact switch member 30 sends an electrical signal to the controller of the conveyor belt mechanism 1 to stop the conveyor belt mechanism 1;

[0046] S2. Operate the second motor 13 to drive the shaft rod 12 to rotate. The shaft rod 12 drives the first arm plate 14, the arm plate 15 and the middle frame 16 to flip over the upper and lower parts of the liquefied gas cylinder, so that the first arm plate 14 and the arm plate 15 are respectively aligned with the upper and lower parts of the liquefied gas cylinder, and the electromagnetic cores of the plurality of electromagnets 19 are energized to adsorb the upper and lower parts of the liquefied gas cylinder;

[0047] S3. Operate the second motor 13 to drive the shaft rod 12 to reverse. The shaft rod 12 drives the first arm plate 14, the arm plate 15 and the middle frame 16 to rotate below the gantry 4. The bracket 26 and the positioning card slot 27 lift and position the middle frame 16, and the electromagnetic cores of the plurality of electromagnets 19 are de-energized to release the upper and lower parts of the liquefied gas cylinder;

[0048] S4. The light source 7 and the vision detection camera 8 are turned on. The first motor 6 drives the gantry 4 to rotate through the rotating shaft 5, so that the light source 7 and the vision detection camera 8 cooperate to perform vision detection on the upper and lower parts of the liquefied gas cylinder, detect the roundness and concentricity of the upper and lower parts of the liquefied gas cylinder. The multiple electric wheels 20 rotate to drive the upper and lower parts of the liquefied gas cylinder to rotate relative to each other, and adjust the overall roundness and concentricity of the upper and lower parts of the liquefied gas cylinder to the best state. The electromagnetic cores of the multiple electromagnets 19 are electrified again to adsorb the upper and lower parts of the liquefied gas cylinder. Operate the two piston rods of the double-headed push cylinder 17 to contract, so that the butting joints of the upper and lower parts of the liquefied gas cylinder are tightened;

[0049] S5. The piston rod of the push cylinder 10 extends to place the smoke collecting hood 9 loosely on the outer walls of the upper and lower parts of the liquefied gas cylinder, so that the welding torch 3 is aligned with the weld seam. Operate the first motor 6 to drive the gantry 4 to rotate through the rotating shaft 5, so that the welding torch 3 performs partial circumferential welding on the butting joints of the upper and lower parts of the liquefied gas cylinder;

[0050] S6. The multiple electromagnets 19 release the upper and lower parts of the liquefied gas cylinder. The multiple electric wheels 20 rotate to drive the partially circumferentially welded liquefied gas cylinder to rotate slowly, so that the welding torch 3 performs full circumferential welding on the weld seam of the liquefied gas cylinder. At the same time, operate the third push cylinder 24 to extend so that the functional component 25 grinds the weld seam;

[0051] S7. Operate the second motor 13 to drive the shaft rod 12 to reverse to place the liquefied gas cylinder with circumferential welding completed back on the conveyor belt mechanism 1. Operate the second motor 13 to drive the shaft rod 12 to drive the first arm plate 14 and the arm plate 15 to return to their original positions. The conveyor belt mechanism 1 conveys the liquefied gas cylinder with circumferential welding completed to the next working station.

[0052] As Figures 1 to 9As shown in the figure, an arc welding machine for processing liquefied gas cylinders and its operation method according to the present invention, when working, first, the conveyor belt mechanism 1 conveys the upper and lower parts of the liquefied gas cylinder backward. When the upper and lower parts of the liquefied gas cylinder are blocked by the contact switch member 30, the conveyor belt mechanism 1 stops. The multi-functional robotic arm grabs the upper and lower parts of the liquefied gas cylinder through a plurality of electromagnets 19. The multi-functional robotic arm rotates in reverse to transfer the upper and lower parts of the liquefied gas cylinder to below the gantry 4. Then, the light source 7 is turned on to irradiate the ends of the upper and lower parts of the liquefied gas cylinder. The vision detection camera 8 performs visual detection on the upper and lower parts of the liquefied gas cylinder by comparing the light and dark parts of the edges of the upper and lower parts of the liquefied gas cylinder. The first motor 6 drives the gantry 4 to rotate slowly through the rotating shaft 5 to perform overall detection on the upper and lower parts of the liquefied gas cylinder. After the detection is completed, according to the detection results, a plurality of electric wheels 20 drive the upper or lower part of the liquefied gas cylinder to rotate, so as to adjust the concentricity and roundness of the upper and lower parts. Then, when the upper and lower parts are adjusted to the best state, a plurality of electromagnets 19 lock the upper and lower parts of the liquefied gas cylinder. The two piston rods of the double-headed push cylinder 17 contract to align and press the upper and lower parts of the liquefied gas cylinder. The welding torch 3 is turned on to weld the weld between the upper and lower parts. The gantry 4 rotates under the drive of the first motor | 6 to perform circumferential welding on the weld until it is blocked by the shaft rod 12 and the middle frame 16. The gantry 4 rotates to make the welding torch 3 reach a vertical state. A plurality of electromagnets 19 release the lock on the upper and lower parts of the liquefied gas cylinder. A plurality of electric wheels 20 drive the upper and lower parts of the semi-welded liquefied gas cylinder to rotate slowly, so that the welding torch 3 performs circumferential full welding on the weld. At the same time, the functional component 25 processes the weld. Finally, the welding is completed. The multi-functional robotic arm moves to place the liquefied gas cylinder back on the conveyor belt mechanism 1, and the conveyor belt mechanism 1 conveys the liquefied gas cylinder to the next working station.

[0053] The main functions achieved by the present invention are as follows:

[0054] 1. It can adjust the upper and lower parts of the liquefied gas cylinder according to the concentricity and roundness before welding. After adjusting to the best state, welding is carried out, so as to ensure the concentricity and roundness of the upper and lower parts of the liquefied gas cylinder after circumferential welding and improve the welding quality.

[0055] 2. It can concentrate the welding fumes and extract them through the exhaust pipe, improving environmental protection.

[0056] 3. It can eliminate the pre-spot welding step, which is beneficial to maintaining the welding strength of the liquefied gas cylinder.

[0057] 4. A new type of adsorption component is proposed, which will not interfere with the rotation of the liquefied gas cylinder and does not require a telescopic mechanism, with a simple structure.

[0058] 5. It can perform treatments such as grinding and heating on the weld.

[0059] An arc welding machine for processing liquefied gas cylinders and its operation method according to the present invention, the installation method, connection method or setting method thereof are all common mechanical methods, and any method that can achieve its beneficial effects can be implemented; the conveyor belt mechanism 1, frame 2, welding torch 3, rotating shaft 5, light source 7, motor 6, visual inspection camera 8, smoke hood 9, push cylinder 10, sliding rod 11, shaft rod 12, motor 13, double-headed push cylinder 17, permanent magnet 18, electromagnet 19, electric wheel 20, bolt assembly 22, push cylinder 24, functional component 25, spring 29, contact switch 30 of the arc welding machine for processing liquefied gas cylinders and its operation method according to the present invention are purchased on the market, and technicians in this industry only need to install and operate according to the attached user manual, without the need for technicians in this field to make creative efforts.

[0060] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present invention, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An arc welding machine for processing liquefied gas cylinders, comprising a conveyor belt mechanism (1), a frame (2) and a welding torch (3). The conveyor belt mechanism (1) is installed on the frame (2), and the conveyor belt mechanism (1) is used to convey the upper and lower parts of the liquefied gas cylinder; it is characterized in that, It also includes a gantry (4), two rotating shafts (5), a first motor (6), a light source (7), a vision detection camera (8) and a multi-functional robotic arm. The gantry (4) is located outside the conveyor belt mechanism (1). The middle part of the gantry (4) is a cross beam, and arm rods are arranged at both ends of the cross beam. The welding torch (3) is installed on the cross beam of the gantry (4). Rotating shafts (5) are arranged at the lower ends of the two arm rods of the gantry (4), and the two rotating shafts (5) are rotatably installed on the frame (2). The first motor (6) is installed on the frame (2), and the output shaft of the first motor (6) is in transmission connection with the rotating shaft (5). The light source (7) and the vision detection camera (8) are respectively installed opposite to each other on the two arm rods of the gantry (4). The light source (7) and the vision detection camera (8) cooperate to conduct vision detection on the upper and lower parts of the liquefied gas cylinder. The multi-functional robotic arm is installed between the conveyor belt mechanism (1) and the gantry (4). The multi-functional robotic arm respectively grabs and transfers the upper and lower parts of the liquefied gas cylinder and adjusts the alignment state of the upper and lower parts of the liquefied gas cylinder; The multi-functional robotic arm includes a shaft rod (12), a second motor (13), a first arm plate (14), an arm plate (15), a middle frame (16), a double-headed push cylinder (17), a plurality of electric wheels (20) and a plurality of adsorption components. The shaft rod (12) is rotatably installed on the frame (2). The shaft rod (12) is located between the conveyor belt mechanism (1) and the gantry (4). A spline is arranged on the outer wall of the shaft rod (12). The second motor (13) is installed on the frame (2), and the output shaft of the second motor (13) is in transmission connection with the shaft rod (12). The inner end of the first arm plate (14) is slidably sleeved on the shaft rod (12) through a spline hole, and the inner end of the arm plate (15) is slidably sleeved on the shaft rod (12) through a spline hole. A plurality of electric wheels (20) and a plurality of adsorption components are installed on both the first arm plate (14) and the arm plate (15). One end of the middle frame (16) is installed on the shaft rod (12). The middle frame (16) is located between the first arm plate (14) and the arm plate (15). The fixed end of the double-headed push cylinder (17) is installed on the middle frame (16), and the two piston rods of the double-headed push cylinder (17) are respectively connected to the first arm plate (14) and the arm plate (15).

2. An arc welding machine for processing liquefied gas cylinders according to claim 1, characterized in that, It also includes a smoke collecting hood (9), a push cylinder (10) and a sliding rod (11). The welding torch (3) is installed in the smoke collecting hood (9). The fixed end of the push cylinder (10) is installed on the cross beam of the gantry (4), and the piston rod of the push cylinder (10) is connected to the smoke collecting hood (9). The smoke collecting hood (9) is located inside the gantry (4). The sliding rod (11) is installed on the smoke collecting hood (9), and the sliding rod (11) is slidably connected to the cross beam of the gantry (4).

3. The arc welding machine for processing liquefied gas cylinders according to claim 1, characterized in that, It also includes a bracket (26) and a positioning card slot (27). The bracket (26) is installed on the frame (2). The bracket (26) is located between the shaft rod (12) and the gantry (4). The positioning card slot (27) is installed on the bracket (26). The bracket (26) supports and holds the middle frame (16), and the positioning card slot (27) clamps both sides of the middle frame (16).

4. The arc welding machine for processing liquefied gas cylinders according to claim 1, characterized in that, The adsorption component includes a permanent magnet (18) and an electromagnet (19). The permanent magnet (18) is mounted on the lower end surface of the first arm plate (14) or the arm plate (15) through a bracket. The electromagnet (19) is slidably mounted on the first arm plate (14) or the arm plate (15). The electromagnet (19) is aligned with the permanent magnet (18). An electromagnetic wire core is installed inside the electromagnet (19). The opposite end polarities of the electromagnet (19) and the permanent magnet (18) are opposite.

5. An arc welding machine for processing liquefied gas cylinders according to claim 1, characterized in that, It further includes a plurality of wheel brackets (21) and a plurality of bolt assemblies (22). A plurality of electric wheels (20) are respectively rotatably mounted on the plurality of wheel brackets (21). The plurality of bolt assemblies (22) respectively pass through the mounting holes of the plurality of wheel brackets (21) to mount the plurality of wheel brackets (21) on the first arm plate (14) and the arm plate (15) respectively.

6. An arc welding machine for processing liquefied gas cylinders according to claim 1, characterized in that, It further includes an arm rod (23), a third push cylinder (24) and a functional component (25). One end of the arm rod (23) is rotatably mounted on the middle frame (16). One end of the third push cylinder (24) is rotatably connected to the middle part of the arm rod (23). The other end of the third push cylinder (24) is rotatably connected to the middle frame (16). The other end of the arm rod (23) is mounted with the functional component (25). The functional component (25) is aligned with the welds on the upper and lower parts of the liquefied gas cylinder.

7. An arc welding machine for processing liquefied gas cylinders and its operation method according to claim 6, characterized in that, The functional component (25) is one or a combination of a spray gun, a grinding wheel, and a wire wheel.

8. An arc welding machine for processing liquefied gas cylinders according to claim 1, characterized in that, It further includes a lever (28), a spring (29), a contact switch component (30), a column (31) and a stop bar (32). The inner end of the lever (28) is rotatably sleeved on the shaft rod (12). The inner end of the lever (28) is elastically mounted on the shaft rod (12) through the spring (29). The outer end of the lever (28) extends above the conveyor belt mechanism (1). The contact switch component (30) is mounted on the outer end of the lever (28). The column (31) is mounted on the frame (2). The stop bar (32) is mounted on the column (31). The stop bar (32) limits and blocks the lever (28).

9. The operation method of an arc welding machine for processing liquefied gas cylinders according to any one of claims 1 to 8, characterized in that, It includes: S1. Convey the upper and lower parts of the liquefied gas cylinder through the conveyor belt mechanism (1). The contact switch component (30) blocks the upper and lower parts of the liquefied gas cylinder. The contact switch component (30) sends an electrical signal to the controller of the conveyor belt mechanism (1) to stop the conveyor belt mechanism (1); S2. Operate the second motor (13) to drive the shaft rod (12) to rotate. The shaft rod (12) drives the first arm plate (14), the arm plate (15) and the middle frame (16) to turn over above the upper and lower parts of the liquefied gas cylinder, so that the first arm plate (14) and the arm plate (15) are respectively aligned with the upper and lower parts of the liquefied gas cylinder. The electromagnetic wire cores of the plurality of electromagnets (19) are energized to adsorb the upper and lower parts of the liquefied gas cylinder; S3. Operate the second motor (13) to drive the shaft rod (12) to reverse. The shaft rod (12) drives the first arm plate (14), the arm plate (15) and the middle frame (16) to rotate to below the gantry (4). The bracket (26) and the positioning card slot (27) lift and position the middle frame (16). The electromagnetic wire cores of the plurality of electromagnets (19) are de-energized to release the upper and lower parts of the liquefied gas cylinder; S4. The light source (7) and the visual detection camera (8) are turned on. The first motor (6) drives the gantry (4) to rotate through the rotating shaft (5), so that the light source (7) and the visual detection camera (8) cooperate to perform visual inspection on the upper and lower parts of the liquefied gas cylinder, detect the roundness and concentricity of the upper and lower parts of the liquefied gas cylinder. The multiple electric wheels (20) rotate to drive the upper and lower parts of the liquefied gas cylinder to rotate relative to each other, and adjust the overall roundness and concentricity of the upper and lower parts of the liquefied gas cylinder to the best state. The electromagnetic cores of the multiple electromagnets (19) are electrified again to adsorb the upper and lower parts of the liquefied gas cylinder. The two piston rods of the double-headed push cylinder (17) are operated to contract, so that the butting joints of the upper and lower parts of the liquefied gas cylinder are tightened. S5. The piston rod of the push cylinder (10) extends to put the smoke collecting hood (9) on the outer walls of the upper and lower parts of the liquefied gas cylinder in a virtual covering manner, so that the welding torch (3) is aligned with the weld seam. The first motor (6) is operated to drive the gantry (4) to rotate through the rotating shaft (5), so that the welding torch (3) performs partial circumferential welding on the butting joints of the upper and lower parts of the liquefied gas cylinder. S6. The multiple electromagnets (19) release the upper and lower parts of the liquefied gas cylinder. The multiple electric wheels (20) rotate to drive the partially circumferentially welded liquefied gas cylinder to rotate slowly, so that the welding torch (3) performs full circumferential welding on the weld seam of the liquefied gas cylinder. At the same time, the third push cylinder (24) is operated to extend so that the functional component (25) grinds the weld seam. S7. The second motor (13) is operated to drive the shaft rod (12) to reverse to put the liquefied gas cylinder with circumferential welding completed back onto the conveyor belt mechanism (1). The second motor (13) is operated to drive the shaft rod (12) to drive the first arm plate (14) and the arm plate (15) to return to their original positions. The conveyor belt mechanism (1) conveys the liquefied gas cylinder with circumferential welding completed to the next working station.

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