A multi-segment magnetic field adjustment weld tracking device

Abstract

The present application discloses a multi-segment magnetic field adjustable weld tracking device, which includes a welding torch provided with a tungsten electrode, a support sleeve, and a magnetic control sliding mechanism. The welding torch is electrically connected to a welding power source; the support sleeve is sleeved on the welding torch; the magnetic control sliding mechanism includes a sliding bracket and four longitudinal magnetic conduction rods. The sliding bracket is connected and arranged at the upper end of the support sleeve, and four extension parts with an adjacent included angle of 90 degrees are radially extended along the edge thereof. A slide rail groove is arranged on the bottom surface of each extension part along the extension direction. The four longitudinal magnetic conduction rods are arranged around the support sleeve, and the upper ends of the longitudinal magnetic conduction rods are respectively in sliding fit with the slide rail grooves of the corresponding extension parts, and longitudinal magnetic induction coils connected to a magnetic field excitation power source are wound at the lower ends. Springs are connected between the middle parts of the longitudinal magnetic conduction rods and the outer wall of the support sleeve respectively. The device of the present application has the advantages of small volume, good accessibility, good stability, accurate arc information acquisition, long service life, good stability and real-time performance.

Description

Technical Field

[0001] This application relates to the field of welding technology, and in particular, to a multi-segment magnetic field regulated weld tracking device. Background Art

[0002] TIG welding is a widely used welding method in industrial production. In view of the continuous improvement of the degree of welding automation in recent years, in the field of welding automatic control, it is mainly to control the TIG arc to achieve automatic weld tracking. The so-called weld tracking is to extract the information of the welding arc in real time during welding, so as to judge the relative position between the welding torch and the weld, and then adjust the welding path and welding parameters, so as to ensure the reliability of welding quality while realizing weld tracking.

[0003] Electromagnetic action welding technology is a new welding technology that has been gradually improved in recent years. With the continuous in-depth research and the expanding research scope, electromagnetic welding technology has developed rapidly, and relevant theories have been gradually formed. At the same time, some technologies have been applied in production practice. Since the arc column of the TIG welding arc is a gas state in which a large number of charged particles such as electrons and positive ions and neutral particles are aggregated together, under the action of an electric field, the charged particles between the arc columns are affected by the electric field force to move, which changes the shape and position of the arc.

[0004] At present, the applications of electromagnetic tracking of TIG welds in the industry include common DC control system devices, mechanical sensors and other methods. Due to the influence of control principles and devices, there are a series of problems such as complex structure, poor device stability, inaccurate arc information collection, low life, poor stability and real-time performance during weld tracking, and poor accessibility due to large volume. Summary of the Invention

[0005] The embodiments of this application provide a multi-segment magnetic field regulated weld tracking device to solve the technical problems of the existing electromagnetic tracking of TIG welds, such as complex structure, poor device stability, inaccurate arc information collection, low life, poor stability and real-time performance during weld tracking, and poor accessibility due to large volume.

[0006] The technical solution adopted in this application is as follows:

[0007] A multi-segment magnetic field adjustment weld tracking device, comprising a welding torch provided with a tungsten electrode, a support sleeve, and a magnetic control sliding mechanism. The welding torch is circuit-connected to a welding power source; the support sleeve is sleeved on the welding torch; the magnetic control sliding mechanism includes a sliding bracket and four longitudinal magnetic conduction rods. The sliding bracket is connected and arranged at the upper end of the support sleeve, and four extension parts with an adjacent included angle of 90 degrees are radially extended along the edge thereof. A slide rail groove is arranged along the extension direction on the bottom surface of each extension part. The four longitudinal magnetic conduction rods are arranged around the support sleeve, and the upper ends of the longitudinal magnetic conduction rods are respectively in sliding fit with the slide rail grooves of the corresponding extension parts. The lower ends are wound with longitudinal magnetic induction coils connected to a magnetic field excitation power source. The middle parts of the longitudinal magnetic conduction rods are respectively connected to the outer wall of the support sleeve through springs; a first transverse magnetic conduction rod perpendicular to the axial direction of each longitudinal magnetic conduction rod is also arranged in the middle of each longitudinal magnetic conduction rod. Four second transverse magnetic conduction rods corresponding to the first transverse magnetic conduction rods are correspondingly arranged on the outer wall of the support sleeve. Transverse magnetic induction coils connected to a magnetic field excitation power source are wound on the four first transverse magnetic conduction rods and the four second transverse magnetic conduction rods.

[0008] Further, the sliding bracket is made of a magnetic insulation material.

[0009] Further, connecting holes for connecting springs are oppositely arranged in the middle parts of the longitudinal magnetic conduction rods and the support sleeve.

[0010] Further, a displacement distance detection device is further included, which is used to detect the moving distance of each longitudinal magnetic conduction rod along the slide rail groove.

[0011] Further, the displacement distance detection device adopts a pressure sensor, and the pressure sensor is arranged at both ends of each spring and is used to calculate the moving distance of the longitudinal magnetic conduction rod along the slide rail groove according to Hooke's law.

[0012] Further, the displacement distance detection device adopts a displacement sensor and is used to measure the moving distance of the longitudinal magnetic conduction rod along the slide rail groove.

[0013] Further, the longitudinal magnetic induction coils and the transverse magnetic induction coils are composed of copper coils, and the outer surfaces of each copper coil are covered with insulating materials. And insulating materials are coated between the longitudinal magnetic induction coils and the longitudinal magnetic conduction rods, between the first transverse magnetic conduction rods and the transverse magnetic induction coils, and between the second transverse magnetic conduction rods and the transverse magnetic induction coils.

[0014] Further, a position sensor for recording the current positions of the longitudinal magnetic conduction rods in the slide rail grooves is further arranged on the sliding bracket.

[0015] Further, the position sensor adopts an optical code disk.

[0016] Furthermore, the magnetic field excitation power supply uses a DC power supply and adjusts the magnitude of the output current according to the weld condition to change the magnitude of the magnetic field.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] The present invention provides a multi-segment magnetic field adjustment weld tracking device, including a welding torch provided with a tungsten electrode, a support sleeve, and a magnetic control sliding mechanism. The welding torch is electrically connected to a welding power supply; the support sleeve is sleeved on the welding torch; the magnetic control sliding mechanism includes a sliding bracket and four longitudinal magnetic conduction rods. The sliding bracket is connected to the upper end of the support sleeve, and four extension parts with an adjacent included angle of 90 degrees are radially extended along the edge thereof. A slide rail groove is arranged on the bottom surface of each extension part along the extension direction. The four longitudinal magnetic conduction rods are arranged around the support sleeve, and the upper ends of the longitudinal magnetic conduction rods are respectively slidably matched with the slide rail grooves of the corresponding extension parts. The lower ends are wound with longitudinal magnetic induction coils connected to a magnetic field excitation power supply. The middle parts of the longitudinal magnetic conduction rods are respectively connected to the outer wall of the support sleeve through springs; a first transverse magnetic conduction rod perpendicular to the axial direction of each longitudinal magnetic conduction rod is further arranged in the middle of each longitudinal magnetic conduction rod. Four second transverse magnetic conduction rods corresponding to the first transverse magnetic conduction rods are arranged on the outer wall of the support sleeve. Transverse magnetic induction coils connected to a magnetic field excitation power supply are wound on the four first transverse magnetic conduction rods and the four second transverse magnetic conduction rods.

[0019] In the present application, the position of each longitudinal magnetic conduction rod is controlled electromagnetically to offset the magnetic field according to the set requirements, while the tungsten electrode of the welding torch does not move, and the arc will not diverge due to inertia, achieving the effect of arc offset. Thus, the information of the arc can be effectively extracted for arc tracking. At the same time, since the four longitudinal magnetic conduction rods provided with longitudinal magnetic induction coils in the present application will generate a segmented magnetic field, the arc of the tungsten electrode will rotate and offset. The rotation of the arc will act on the surface of the molten pool, making the weld heat evenly distributed, and the molten metal can spread evenly on the surface of the workpiece, reducing the probability of undercut and hump weld. The molten pool of the weld is stirred, the crystal grains are finer, and the welding quality is better; in addition, compared with the prior art, the present application has the advantages of simple structure, small volume, good accessibility, good device stability, accurate arc information collection, long service life, good stability and real-time performance during weld tracking. [[ID= eleven]]Description of the Drawings

[0020] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0021] Figure 1 It is a schematic structural diagram of the multi-segment magnetic field adjustment weld tracking device of the present invention.

[0022] Figure 2Schematic diagram of the longitudinal magnetic conduction rod of the multi-segment magnetic field adjustment weld tracking device of the present invention.

[0023] Figure 3 Schematic diagram of the change in the arc shape when the four longitudinal magnetic conduction rods do not move.

[0024] Figure 4 Schematic diagram of the change in the arc shape after the left longitudinal magnetic conduction rod moves.

[0025] Figure 5 Schematic diagram of the change in the arc shape after the right longitudinal magnetic conduction rod moves.

[0026] Figure 6 Schematic diagram of the change in the arc shape after the four longitudinal magnetic conduction rods move the same distance.

[0027] Figure 7 Schematic diagram of the magnetic field distribution when a single longitudinal magnetic conduction rod moves.

[0028] Figure 8 Schematic diagram of the magnetic field distribution when the four longitudinal magnetic conduction rods move.

[0029] In the figure: 1. Magnetic control sliding mechanism; 2. Spring; 3. Transverse magnetic induction coil; 4. Tungsten electrode; 5. Slide rail groove; 6. Longitudinal magnetic conduction rod; 7. Longitudinal magnetic induction coil; 8. Support sleeve; 9. Connection hole; 10. Pressure sensor; 11. First transverse magnetic conduction rod. Detailed implementation manners

[0030] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0031] Refer to Figure 1 and Figure 2, a preferred embodiment of the present application provides a multi-segment magnetic field adjustable weld tracking device, including a welding torch provided with a tungsten electrode 4, a support sleeve 8, and a magnetic control sliding mechanism 1. The welding torch is electrically connected to a welding power source; the support sleeve 8 is sleeved on the welding torch; the magnetic control sliding mechanism 1 includes a sliding bracket and four longitudinal magnetic conduction rods 6. The sliding bracket is connected to the upper end of the support sleeve 8, and four extending parts with an adjacent included angle of 90 degrees are radially extended from its edge. A slide rail groove 5 is arranged on the bottom surface of each extending part along the extending direction. The four longitudinal magnetic conduction rods 6 are symmetrically arranged around the support sleeve 8, and the upper ends of the longitudinal magnetic conduction rods 6 are respectively slidably matched with the slide rail grooves 5 of the corresponding extending parts. The lower ends of the longitudinal magnetic conduction rods 6 are wound with longitudinal magnetic induction coils 7 with the same number of turns and connected to a magnetic field excitation power source. At this time, the axes of the four longitudinal magnetic conduction rods 6 are parallel to the axis of the support sleeve 8, and the magnetic field excitation power source inputs the same magnitude and the same direction of current to the four groups of longitudinal magnetic induction coils 7 wound on the longitudinal magnetic conduction rods 6 to generate a longitudinal magnetic field. The middle parts of the longitudinal magnetic conduction rods 6 are respectively connected to the outer wall of the support sleeve 8 through springs 2; a first transverse magnetic conduction rod 11 perpendicular to the axis of each longitudinal magnetic conduction rod 6 is also arranged in the middle of each longitudinal magnetic conduction rod 6. Four second transverse magnetic conduction rods corresponding to the first transverse magnetic conduction rods 11 are arranged on the outer wall of the support sleeve 8. Transverse magnetic induction coils 3 connected to a magnetic field excitation power source are wound on the four first transverse magnetic conduction rods 11 and the four second transverse magnetic conduction rods. The longitudinal magnetic conduction rods 6 are made of soft iron with the best magnetic conduction performance, and the upper parts of the longitudinal magnetic conduction rods 6 are embedded in the slide rail grooves 5. When the magnetic field excitation power source inputs the same magnitude and the same direction of current to the longitudinal magnetic induction coils 7 on the four longitudinal magnetic conduction rods 6, since the four longitudinal magnetic conduction rods 6 are at the same distance from the tungsten electrode 4 and are symmetrically distributed, the magnetic field intensity around the tungsten electrode 4 is symmetrically distributed in magnitude.

[0032] In this embodiment, the positions of the longitudinal magnetic conduction rods are controlled electromagnetically to offset the magnetic field according to the set requirements, while the tungsten electrode 4 of the welding torch does not move, and the arc will not diverge due to inertia, achieving the effect of arc offset, so as to effectively extract the arc information for arc tracking. At the same time, since the four longitudinal magnetic conduction rods 6 provided with longitudinal magnetic induction coils 7 in this embodiment will generate a segmented magnetic field, the arc of the tungsten electrode 4 will rotate and offset. The arc rotation will act on the surface of the molten pool, making the weld heat evenly, the molten metal can spread evenly on the surface of the workpiece, reducing the probability of undercut and weld bead appearance, the molten pool of the weld is stirred, the grains are more refined, and the welding quality is better.

[0033] In an optional embodiment of the present application, the sliding bracket is made of a non-magnetic material.

[0034] Such as Figure 2As shown, in an alternative embodiment of the present application, connection holes 9 for connecting the spring 2 are oppositely provided in the middle of the longitudinal magnetic conduction rod 6 and the support sleeve 8.

[0035] In an alternative embodiment of the present application, the multi-segment magnetic field regulation weld tracking device further includes a displacement distance detection device for detecting the moving distance of each longitudinal magnetic conduction rod 6 along the slide rail groove 5.

[0036] In an alternative embodiment of the present application, the displacement distance detection device uses a pressure sensor 10. The pressure sensor 10 is provided at both ends of each spring 2. When the first transverse magnetic conduction rod 11 perpendicular to the longitudinal magnetic conduction rod 6 and the corresponding transverse magnetic induction coils 3 on the second transverse magnetic conduction rod perpendicular to the support sleeve 8 are simultaneously conducting current, the opposite surfaces of the two corresponding transverse magnetic induction coils 3 respectively form an N pole and an S pole, and the two coils attract each other. The longitudinal magnetic conduction rod 6 will move along the slide rail groove 5 in the direction of the axis of the support sleeve 8 and slowly compress the spring 2. The pressure sensor 10 fixed at both ends of the spring 2 will measure the magnitude of the pressure, and then calculate the moving distance of the longitudinal magnetic conduction rod 6 along the slide rail groove 5 according to Hooke's law. When the two transverse magnetic induction coils 3 are powered off, the spring 2 will slowly push the longitudinal magnetic conduction rod 6 back to its original position along the slide rail groove 5, that is, move along the slide rail groove 5 in the direction away from the axis of the support sleeve 8.

[0037] In an alternative embodiment of the present application, the displacement distance detection device uses a displacement sensor for measuring the moving distance of the longitudinal magnetic conduction rod 6 along the slide rail groove 5.

[0038] In an alternative embodiment of the present application, the longitudinal magnetic induction coils 7 and the transverse magnetic induction coils 3 are composed of copper coils. The outer surface of each copper coil is covered with an insulating material, and insulating materials are also coated between the longitudinal magnetic induction coils 7 and the respective longitudinal magnetic conduction rods 6, between the first transverse magnetic conduction rod and the transverse magnetic induction coils 3, and between the second transverse magnetic conduction rod 11 and the transverse magnetic induction coils 3.

[0039] In an alternative embodiment of the present application, a position sensor for recording the current position of each longitudinal magnetic conduction rod 6 in the slide rail groove 5 is further provided on the sliding bracket.

[0040] In an alternative embodiment of the present application, the position sensor uses an optical code disk. When the current of the transverse magnetic induction coil 3 gradually decreases, the spring 2 will drive each longitudinal magnetic conduction rod 6 to return to its original position. At this time, the optical code disk records the positions of each longitudinal magnetic conduction rod 6.

[0041] In an alternative embodiment of the present application, the magnetic field excitation power supply uses a DC power supply, and adjusts the magnitude of the output current according to the weld condition to change the magnitude of the magnetic field, and further change the magnitude of the swing angle of the arc.

[0042] Figure 3 , Figure 4 , Figure 5 and Figure 6 are schematic diagrams of the arc shape of a TIG arc under the action of a longitudinal magnetic field. Among them, Figure 3 when the positions of the longitudinal magnetic conduction rods 6 do not move, the magnetic field around the tungsten electrode 4 is symmetrically distributed. At this time, the position and shape of the arc after the tungsten electrode 4 is started are also symmetric. When the position of the right longitudinal magnetic conduction rod 6 moves, the magnetic field distribution (as shown in Figure 7 ), at this time, the longitudinal magnetic field intensity on the right side of the arc is greater than that on the left side, breaking the balance of the magnetic field around the tungsten electrode 4 and generating an asymmetrically distributed magnetic field. Under the action of the magnetic field, the arc will be affected by the Lorentz force and be pulled to the right side with a larger magnetic induction intensity to scan the weld on the surface of the welded part (as shown in Figure 5 ). At the same time, by changing the current magnitude of the longitudinal magnetic induction coil 7 on the right longitudinal magnetic conduction rod 6, the deflection angle and distance of the arc can be changed; when changing the distance from other longitudinal magnetic conduction rods 6 to the tungsten electrode 4, the distribution of the generated magnetic induction intensity will also change, as shown in Figure 4 . When the position of the left longitudinal magnetic conduction rod 6 moves to the left under the transverse magnetic field generated by the transverse magnetic induction coil 3, the arc will also deflect to the left under the traction of the Lorentz force to scan the weld on the left side of the welded part. It can be seen that in this application, the direction of the arc deflection is controlled by adjusting the distance between each longitudinal magnetic conduction rod 6 and the tungsten electrode 4 through the transverse magnetic field generated by each transverse magnetic induction coil 3. It should be noted that in the above embodiments, while the arc deflects under the traction of the Lorentz force, due to the action of the four segmented magnetic fields generated by the four longitudinal magnetic conduction rods 6, whether the arc deflects or not, the arc will generate a certain rotation. At this time, the four longitudinal magnetic conduction rods 6 are similar to the stator of a motor, and the arc of the tungsten electrode 4 is similar to the rotor of a motor. The rotation speed is determined by the magnetic field intensity around the tungsten electrode 4. The rotating arc will make the heat of the weld more uniform, the molten pool of the weld will be stirred to a certain extent, and the grains will be more refined.

[0043] When the four longitudinal magnetic conduction rods 6 move the same distance under the magnetic force of the transverse magnetic induction coil 3, the magnetic field around the tungsten electrode is still symmetrically distributed (as shown in Figure 8 ), but the magnetic field intensity will increase. At this time, the rotation radius of the arc will expand (as shown in Figure 6As shown, the rotation speed of the arc will increase, making the heat received by the weld seam more uniform, the molten pool of the weld seam fully stirred, and the grains further refined. When the arc scans the weld seam back and forth under the action of the asymmetric longitudinal direction, the relevant arc parameters are extracted by the Hall element sensor, and there will be a corresponding welding parameter for each weld position. These data are input into the data analysis system for analysis to obtain the corresponding welding parameters, and these parameters are fed back to the adjustment mechanism. The adjustment mechanism adjusts the welding path and welding parameters according to the obtained data, so as to realize the precise automatic tracking of the weld seam.

[0044] The above embodiments can be used to solve the problems of easy wear, high noise and poor stability of the existing mechanical arc sensors, as well as the technical problem that the current longitudinal magnetic field cannot control the arc deviation.

[0045] The above are only the preferred embodiments of the present application and are not used to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-segment magnetic field regulation weld tracking device, characterized in that: It includes a welding torch provided with a tungsten electrode (4), a support sleeve (8), and a magnetically controlled sliding mechanism (1). The welding torch is circuit-connected to a welding power source; the support sleeve (8) is sleeved on the welding torch; the magnetically controlled sliding mechanism (1) includes a sliding bracket and four longitudinal magnetic conduction rods (6). The sliding bracket is connected and arranged at the upper end of the support sleeve (8). Four extension parts with an adjacent included angle of 90 degrees are radially extended from its edge. A slide rail groove (5) is arranged along the extension direction on the bottom surface of each extension part. The four longitudinal magnetic conduction rods (6) are arranged around the support sleeve (8), and the upper ends of the longitudinal magnetic conduction rods (6) are respectively in sliding fit with the slide rail grooves (5) of the corresponding extension parts. The lower ends are wound with longitudinal magnetic induction coils (7) connected to a magnetic field excitation power source. The middle parts of the longitudinal magnetic conduction rods (6) are all connected to the outer wall of the support sleeve (8) through springs (2); a first transverse magnetic conduction rod (11) perpendicular to the axis of each longitudinal magnetic conduction rod (6) is also arranged in the middle of each longitudinal magnetic conduction rod (6). Four second transverse magnetic conduction rods corresponding to the first transverse magnetic conduction rods (11) are correspondingly arranged on the outer wall of the support sleeve (8). Transverse magnetic induction coils (3) connected to a magnetic field excitation power source are wound on the four first transverse magnetic conduction rods (11) and the four second transverse magnetic conduction rods; the magnetic field excitation power source uses a DC power source, and the output current is adjusted according to the weld condition to change the size of the magnetic field.

2. The multi-segment magnetic field adjustment weld tracking device according to claim 1, wherein: The sliding bracket is made of a non-magnetic material.

3. The multi-segment magnetic field adjustment weld tracking device according to claim 1, characterized in that: Connecting holes (9) for connecting the springs (2) are oppositely arranged in the middle parts of the longitudinal magnetic conduction rods (6) and the support sleeve (8).

4. The multi-segment magnetic field adjustment weld tracking device according to claim 1, wherein: It further includes a displacement distance detection device for detecting the moving distance of each longitudinal magnetic conduction rod (6) along the slide rail groove (5).

5. The multi-segment magnetic field adjustment weld tracking device according to claim 4, characterized in that: The displacement distance detection device uses a pressure sensor (10). The pressure sensor (10) is arranged at both ends of each spring (2) and is used to calculate the moving distance of the longitudinal magnetic conduction rod (6) along the slide rail groove (5) according to Hooke's law.

6. The multi-segment magnetic field adjustment weld tracking device according to claim 4, wherein: The displacement distance detection device uses a displacement sensor for measuring the moving distance of the longitudinal magnetic conduction rod (6) along the slide rail groove (5).

7. The multi-segment magnetic field adjustment weld tracking device according to claim 1, characterized in that: The longitudinal magnetic induction coils (7) and the transverse magnetic induction coils (3) are composed of copper coils. The outer surface of each copper coil is covered with an insulating material, and insulating materials are coated between the longitudinal magnetic induction coils (7) and the longitudinal magnetic conduction rods (6), between the first transverse magnetic conduction rods (11) and the transverse magnetic induction coils (3), and between the second transverse magnetic conduction rods and the transverse magnetic induction coils (3).

8. The multi-segment magnetic field adjustment weld tracking device according to claim 1, characterized in that: A position sensor for recording the current position of each longitudinal magnetic conduction rod (6) in the slide rail groove (5) is further arranged on the sliding bracket.

9. The multi-segment magnetic field adjustment weld tracking device according to claim 8, wherein: The position sensor uses an optical code disk.

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