Intelligent welding seam monitoring device

Abstract

The invention discloses an intelligent welding seam monitoring device, and belongs to the field of welding equipment. The device comprises a clamping mechanism and further comprises a detection mechanism connected to the clamping mechanism, a to-be-welded steel pipe is inserted into the clamping mechanism in a penetrating mode, the detection mechanism comprises a resistance welding connector arranged on the upper portion of a welding seam, the detection mechanism further comprises a rotating shaft, and a driving wheel used for driving the to-be-welded steel pipe to rotate is fixedly connected to the rotating shaft. The rotating speed of the driving wheel is equal to that of a to-be-welded steel pipe, a plurality of detection columns in an annular array are axially and slidably connected to the end face of the driving wheel, the driving wheel is provided with a first end face and a second end face, and when the contact pressure is increased, the detection columns at the positions corresponding to welding seams slide towards the first end face of the driving wheel, and when the contact pressure is reduced, the detection columns at the positions corresponding to the welding seams slide towards the second end face of the driving wheel. The detection column at the position corresponding to the welding seam slides towards the second end face of the driving wheel; according to the device, the current change in the welding process and possible welding defects can be intuitively obtained by detecting whether the column slides or not and detecting the sliding direction of the column.

Description

Technical Field

[0001] The invention relates to the technical field of welding equipment, and in particular to an intelligent weld monitoring device. Background Art

[0002] In modern industrial manufacturing, resistance welding is widely used in many fields such as automobile manufacturing, aerospace, and electronic equipment production due to its advantages of high efficiency, energy saving, and stable welding quality. For example, in automobile body manufacturing, a large number of parts are connected together by resistance welding to build the overall frame of the car.

[0003] In the process of resistance welding, current is one of the key parameters. According to Joule's law \(Q=I^{2}Rt\) (where \(Q\) is heat, \(I\) is current, \(R\) is resistance, and \(t\) is time), the magnitude of the current directly determines the heat generated during welding, which in turn affects the quality of the weld. When the current changes, it will have a significant impact on the welding effect. If the current is too large, it will cause local overheating of the weldment, resulting in problems such as burn-through and spatter, reducing the mechanical properties and appearance quality of the weld; if the current is too small, it may cause defects such as incomplete penetration and cold welding of the weldment, making the weld unable to meet the strength requirements.

[0004] At present, although there are many current monitoring methods applied to the field of resistance welding, such as using current sensors to monitor the current in the welding circuit. However, most of these methods can only monitor the value of the current, and it is difficult to directly reflect the actual impact of current changes on the quality of the weld. In the actual welding process, the contact resistance between the electrode and the weldment will change due to various factors, such as the roughness of the weldment surface, the fluctuation of the electrode pressure, etc. According to Ohm's law \(I=U / R\) (where \(I\) is the current, \(U\) is the voltage, and \(R\) is the resistance), changes in contact resistance will cause current fluctuations, and existing monitoring technologies are difficult to quickly and accurately associate this current change with the real-time status of the weld quality. For example, when welding steel pipes, traditional monitoring methods cannot promptly detect changes in contact resistance caused by the undulations of the weld surface, and thus cannot promptly adjust welding parameters, resulting in welding defects.

[0005] Therefore, it is of great practical significance to develop a monitoring device that can monitor the current changes during resistance welding in real time and accurately and directly reflect the quality of the weld. It is crucial to improve welding production efficiency, reduce scrap rate and ensure product quality. Summary of the invention

[0006] The purpose of the present invention is to provide an intelligent weld monitoring device, which solves the problem that the existing device is not easy to directly reflect the quality of the weld.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solutions: an intelligent weld monitoring device, comprising a clamping mechanism, and also comprising a detection mechanism connected to the clamping mechanism, the steel pipe to be welded is inserted into the clamping mechanism and driven by the clamping mechanism to rotate on a fixed axis, the detection mechanism comprises a resistance welding head arranged on the upper part of the weld, when the steel pipe to be welded rotates, the resistance welding head moves relatively to the weld;

[0008] The detection mechanism also includes a rotating shaft, on which a driving wheel for driving the steel pipe to be welded to rotate is fixedly connected, the rotation speed of the driving wheel is equal to the rotation speed of the steel pipe to be welded, and a plurality of detection columns in an annular array are axially slidably connected on the end face of the driving wheel, and the plurality of detection columns correspond to the welding points on the weld, and the contact pressure between the resistance welding head and the weld can increase or decrease with the fluctuation of the weld surface, and the driving wheel has a first end face and a second end face, and when the contact pressure increases, the detection column at the corresponding position of the weld slides toward the first end face of the driving wheel, and when the contact pressure decreases, the detection column at the corresponding position of the weld slides toward the second end face of the driving wheel.

[0009] Preferably, the detection mechanism also includes a plurality of sliding rods, the plurality of detection columns are respectively connected to the plurality of sliding rods, a disc is fixedly connected to the rotating shaft, a threaded rod is connected to the sliding rod, a threaded hole matching the threaded rod is provided on the disc, and when the threaded rod rotates in the threaded hole, the detection column slides on the driving wheel.

[0010] Preferably, the detection mechanism also includes an electric telescopic rod, the output end of the electric telescopic rod is connected to a mounting seat, a first rack and a second rack are vertically symmetrically connected to the mounting seat, the ends of the plurality of threaded rods are connected to gears, a pressure sensor is provided on the resistance welding head, and when the pressure sensor detects that the contact pressure of the resistance welding head decreases or increases, the electric telescopic rod is synchronously extended or shortened to move the mounting seat, so that the first rack or the second rack engages with the gear to cause the detection column at the corresponding position of the weld to slide.

[0011] Preferably, the clamping mechanism includes a base, two supports are symmetrically connected to the base, a driven wheel is rotatably connected inside the support, the driven wheel is connected to the driving wheel through a belt, the driven wheel and the support are provided with holes for the steel pipe to pass through, an electric clamp is provided inside the driven wheel, the electric clamp clamps the steel pipe so that the steel pipe is in a coaxial position with the driven wheel.

[0012] Preferably, it also includes a current control mechanism, which includes inner cone rings symmetrically arranged on both sides of the resistance welding head, and two guide rods are symmetrically connected to the resistance welding head, and the ends of the two guide rods are respectively abutted against the inner cone surfaces of the two inner cone rings, and the two inner cone rings are close to each other to drive the resistance welding head to be pressed against the weld.

[0013] Preferably, the end surface of the inner cone ring is fixedly connected with a round rod, the round rod is inserted into the support, the first piston plate is fixedly connected to the round rod, a cylindrical hole matching with the first piston plate is opened in the support, the cylindrical hole is connected with a first oil pipe, the first oil pipe is connected with a second oil pipe, the second oil pipe is connected to an external hydraulic oil pump, when the external hydraulic oil pump pumps or extracts hydraulic oil into the cylindrical hole, the two inner cone rings are close to or away from the resistance welding joint;

[0014] When the welding current increases, the external hydraulic oil pump draws hydraulic oil to move the two inner cone rings away from each other, thereby reducing the welding current; and when the welding current decreases, the external hydraulic oil pump pumps hydraulic oil to move the two inner cone rings closer to each other, thereby increasing the welding current.

[0015] Preferably, it also includes a repair welding mechanism, which includes an electric push rod, which is fixedly connected to the base, and the output end of the electric push rod is fixedly connected to a slide seat, the slide seat is fixedly connected to a piston cylinder and slidably connected to a U-shaped frame, the U-shaped frame is fixedly connected to a piston rod, and the end of the piston rod is fixedly connected to a second piston plate, the second piston plate slides in the piston cylinder, and the spaces in the piston cylinder on both sides of the second piston plate are filled with hydraulic oil and are connected to a third oil pipe, the third oil pipe is connected to the first oil pipe, when the driving wheel reverses, the external hydraulic oil pump extracts a small amount of hydraulic oil and then stops running, and the electric push rod is extended to make the U-shaped frame close to the driving wheel, and when the driving wheel reverses, the detection column protruding from either end surface of the driving wheel can push the U-shaped frame to slide, so that the resistance welding joint is repaired at the missing welding position.

[0016] Preferably, a position sensor for detecting the sliding direction of the U-shaped frame is provided on the slide seat, and when the position sensor detects that the U-shaped frame slides toward the first end face direction of the driving wheel, the rotation speed of the driving wheel increases; and when the position sensor detects that the U-shaped frame slides toward the second end face direction of the driving wheel, the rotation speed of the driving wheel remains unchanged.

[0017] Preferably, both of the two third oil pipes are provided with solenoid valves, and when the electric push rod is shortened, both of the solenoid valves are closed;

[0018] The two third oil pipes are connected to a box body between the piston cylinder and the solenoid valve, and a rectangular plate is connected to the box body through a tension spring. The side wall of the rectangular plate fits with the inner wall of the box body. When the U-shaped frame slides, the solenoid valve located in the opposite direction of the sliding of the U-shaped frame is closed, and the other solenoid valve is opened.

[0019] Preferably, the U-shaped frame and the two end surfaces of the driving wheel repel each other magnetically, and when the U-shaped frame is located in the axial middle of the driving wheel, the magnetic repulsive forces are equal;

[0020] Two inclined plates are symmetrically connected to the base at both sides of the electric push rod. When the electric push rod is shortened, the inclined plates guide the U-shaped frame to slide so that the second piston plate moves to the middle of the piston cylinder.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention reflects the welding effect of the weld by detecting the pressure between the resistance welding joint and the weld. The driving wheel drives the steel pipe to be welded to rotate at the same speed. When the pressure between the resistance welding joint and the weld changes and causes poor welding quality, the detection column on the driving wheel corresponding to the angle of the welding part can slide. The welding effect of the weld can be obtained by observing the sliding of the detection column. In addition, when the contact pressure is large, it will cause the weldment to overheat and burn through. At this time, the detection column slides out toward the first end face of the driving wheel. When the contact pressure is small, it will cause incomplete welding. At this time, the detection column slides toward the second end face of the driving wheel. Therefore, the current change in the welding process and the possible welding defects can be obtained according to the sliding direction of the detection column. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a structural schematic diagram of the support of the present invention;

[0025] Figure 3 It is a structural schematic diagram of the current control mechanism of the present invention;

[0026] Figure 4 It is a structural schematic diagram of the detection mechanism of the present invention;

[0027] Figure 5 It is a structural schematic diagram of the slide bar of the present invention;

[0028] Figure 6 It is a structural schematic diagram of the repair welding mechanism of the present invention;

[0029] Figure 7 It is a structural schematic diagram of the inclined plate of the present invention;

[0030] Figure 8 It is a structural schematic diagram of the box body of the present invention;

[0031] Fig. 9 It is a structural schematic diagram of the grinding mechanism of the present invention.

[0032] In the figure: 100, clamping mechanism; 110, base; 120, support; 130, driven wheel; 200, detection mechanism; 210, rotating shaft; 220, driving wheel; 230, resistance welding head; 240, electric telescopic rod; 250, mounting seat; 251, first rack; 252, second rack; 260, slide rod; 261, detection column; 262, threaded rod; 263, gear; 270, disc; 300, repair welding mechanism; 310, electric push rod; 320, slide seat; 330, piston cylinder; 340 , U-shaped frame; 341, piston rod; 342, second piston plate; 350, third oil pipe; 351, solenoid valve; 360, box body; 361, rectangular plate; 362, tension spring; 370, first oil pipe; 380, second oil pipe; 390, inclined plate; 400, current control mechanism; 410, inner cone ring; 420, round rod; 430, first piston plate; 440, spring; 450, guide rod; 500, grinding mechanism; 510, fixed seat; 520, hydraulic rod; 530, mounting frame; 540, grinding roller. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Reference Figure 1-Figure 9The present embodiment provides a technical solution: an intelligent weld monitoring device, comprising a clamping mechanism 100, and a detection mechanism 200 connected to the clamping mechanism 100. The steel pipe to be welded is inserted into the clamping mechanism 100 and driven by the clamping mechanism 100 to rotate on a fixed axis. The detection mechanism 200 comprises a resistance welding head 230 arranged on the upper part of the weld. When the steel pipe to be welded rotates, the resistance welding head 230 moves relatively to the weld. The detection mechanism 200 also comprises a rotating shaft 210, and a driving wheel 220 for driving the steel pipe to be welded to rotate is fixedly connected to the rotating shaft 210. The driving wheel 220 The rotation speed is equal to the rotation speed of the steel pipe to be welded. A plurality of detection columns 261 in an annular array are axially slidably connected on the end face of the driving wheel 220. The plurality of detection columns 261 correspond to the welding points on the weld. The contact pressure between the resistance welding head 230 and the weld can increase or decrease with the fluctuation of the weld surface. The driving wheel 220 has a first end face and a second end face. When the contact pressure increases, the detection column 261 at the corresponding position of the weld slides toward the first end face of the driving wheel 220, and when the contact pressure decreases, the detection column 261 at the corresponding position of the weld slides toward the second end face of the driving wheel 220.

[0035] The two sections of steel pipe to be welded are fixed by the clamping mechanism 100 so that the two ends of the steel pipe to be welded are in contact with each other, the position of the resistance welding head 230 is adjusted and fixed so that the resistance welding head 230 and the weld of the steel pipe have appropriate contact pressure, the clamping mechanism 100 drives the steel pipe to rotate so that the weld is relatively displaced to the resistance welding head 230, so that the resistance welding head 230 welds the weld part, because the resistance welding head 230 is in contact with the weld, when the weld moves, the pressure between the resistance welding head 230 and the weld can change with the height fluctuation of the weld, the electrode pressure will affect the contact resistance between the weldment and the electrode, according to Ohm's law, when the contact pressure changes, the current will also change, and the change of current affects the welding effect of the weld, the device is Detecting the pressure between the resistance welding head 230 and the weld reflects the welding effect of the weld. The driving wheel 220 drives the steel pipe to be welded to rotate at the same speed. When the pressure change between the resistance welding head 230 and the weld leads to poor welding quality, the detection column 261 on the driving wheel 220 corresponding to the angle of the welding part can slide. The welding effect of the weld can be obtained by observing the sliding of the detection column 261. In addition, when the contact pressure is large, it will cause the weldment to overheat and burn through. At this time, the detection column 261 slides toward the first end face of the driving wheel 220. When the contact pressure is small, it will cause incomplete penetration. At this time, the detection column 261 slides toward the second end face of the driving wheel 220. Therefore, the current change in the welding process and the possible welding defects can be obtained according to the sliding direction of the detection column 261.

[0036] The detection mechanism 200 also includes multiple sliding rods 260, and multiple detection columns 261 are respectively connected to the multiple sliding rods 260. A disc 270 is fixedly connected to the rotating shaft 210. A threaded rod 262 is connected to the sliding rod 260. A threaded hole that cooperates with the threaded rod 262 is opened on the disc 270. When the threaded rod 262 rotates in the threaded hole, the detection column 261 slides on the driving wheel 220.

[0037] The disc 270 and the driving wheel 220 are both fixedly connected to the rotating shaft 210, so that the disc 270 can rotate synchronously with the driving wheel 220. The two ends of the sliding rod 260 are respectively connected to the detection column 261 and the threaded rod 262. When the contact pressure of the resistance welding head 230 changes, the threaded rod 262 can rotate relative to the threaded hole on the disc 270, so that the sliding rod 260 slides axially to drive the detection column 261 to slide axially relative to the driving wheel 220.

[0038] The detection mechanism 200 also includes an electric telescopic rod 240, the output end of the electric telescopic rod 240 is connected to a mounting base 250, a first rack 251 and a second rack 252 are vertically symmetrically connected to the mounting base 250, the ends of multiple threaded rods 262 are all connected to gears 263, and a pressure sensor is provided on the resistance welding head 230. When the pressure sensor detects that the contact pressure of the resistance welding head 230 decreases or increases, the electric telescopic rod 240 synchronously extends or shortens to move the mounting base 250, so that the first rack 251 or the second rack 252 engages with the gear 263 to make the detection column 261 at the corresponding position of the weld slide.

[0039] The extension and retraction of the electric telescopic rod 240 follows the pressure change of the resistance welding head 230. When the pressure sensor detects that the contact pressure of the resistance welding head 230 increases, the electric telescopic rod 240 extends. At this time, the second rack 252 engages with the gear 263 on the disk 270 of the corresponding weld angle, thereby driving the threaded rod 262 to rotate, so that the detection column 261 slides toward the first end surface of the driving wheel 220. Conversely, when the contact pressure of the resistance welding head 230 decreases, the electric telescopic rod 240 shortens. At this time, the first rack 251 engages with the gear 263 on the disk 270 of the corresponding weld angle, thereby driving the threaded rod 262 to rotate, so that the detection column 261 slides toward the second end surface of the driving wheel 220.

[0040] The clamping mechanism 100 includes a base 110, on which two supports 120 are symmetrically connected, a driven wheel 130 is rotatably connected inside the support 120, the driven wheel 130 is transmission-connected to the driving wheel 220 via a belt, holes for the steel pipe to pass through are provided on the driven wheel 130 and the support 120, an electric clamp is provided inside the driven wheel 130, and the electric clamp clamps the steel pipe so that the steel pipe is in a coaxial position with the driven wheel 130.

[0041] The diameters of the driving wheel 220 and the driven wheel 130 are equal, so that when the driving wheel 220 rotates, the driven wheel 130 and the driving wheel 220 can be driven by the belt to rotate at the same speed, thereby ensuring that the multiple detection columns 261 can correspond to the positions on the weld.

[0042] It also includes a current control mechanism 400, which includes inner cone rings 410 symmetrically arranged on both sides of the resistance welding head 230. Two guide rods 450 are symmetrically connected to the resistance welding head 230. The ends of the two guide rods 450 are respectively abutted against the inner cone surfaces of the two inner cone rings 410. The two inner cone rings 410 are close to each other to drive the resistance welding head 230 to be pressed against the weld.

[0043] The pressure sensor is set on any guide rod 450. At the beginning of welding, the distance between the two inner cone rings 410 is adjusted so that the pressure applied by the inner cone ring 410 to the two guide rods 450 is equal. At this time, the contact pressure detected by the pressure sensor is the pressure between the resistance welding head 230 and the weld. The contact pressure is adjusted to an appropriate range, and then the steel pipe to be welded is controlled to rotate so that the resistance welding head 230 welds the weld.

[0044] The end surface of the inner conical ring 410 is fixedly connected to a round rod 420, which is inserted into the support 120. A first piston plate 430 is fixedly connected to the round rod 420. A cylindrical hole matching the first piston plate 430 is opened in the support 120. The cylindrical hole is connected to a first oil pipe 370, and the first oil pipe 370 is connected to a second oil pipe 380. The second oil pipe 380 is connected to an external hydraulic oil pump. When the external hydraulic oil pump pumps or extracts hydraulic oil into the cylindrical hole, the two inner conical rings 410 approach or move away from the resistance welding head 230; when the welding current increases, the external hydraulic oil pump extracts hydraulic oil to make the two inner conical rings 410 move away from each other, thereby reducing the welding current; and when the welding current decreases, the external hydraulic oil pump pumps hydraulic oil to make the two inner conical rings 410 move closer to each other, thereby increasing the welding current.

[0045] In order to avoid poor weld quality caused by excessive or insufficient welding current, during the welding process, when the contact pressure is too large or too small, the spacing between the two inner cone rings 410 will change. When the control system receives a signal that the contact pressure is too large and the welding current increases, it controls the external hydraulic oil pump to operate, and equally extracts the hydraulic oil in the two groups of cylindrical holes, so that the first piston plate 430 slides, so that the two inner cone rings 410 are equidistant from each other, thereby reducing the contact pressure of the resistance welding head 230 and reducing the welding current. Conversely, the external hydraulic oil pump injects an equal amount of hydraulic oil into the two groups of cylindrical holes, so that the two inner cone rings 410 are equidistant from each other, thereby increasing the contact pressure of the resistance welding head 230 and increasing the welding current.

[0046] The repair welding mechanism 300 also includes an electric push rod 310, the electric push rod 310 is fixedly connected to the base 110, the output end of the electric push rod 310 is fixedly connected to a slide seat 320, the slide seat 320 is fixedly connected to a piston cylinder 330, and is slidably connected to a U-shaped frame 340, the U-shaped frame 340 is fixedly connected to a piston rod 341, the end of the piston rod 341 is fixedly connected to a second piston plate 342, the second piston plate 342 slides in the piston cylinder 330, and the piston cylinder 330 is located in the second piston plate 342. The spaces on both sides of the piston plate 342 are filled with hydraulic oil and are connected to the third oil pipe 350. The third oil pipe 350 is connected to the first oil pipe 370. When the driving wheel 220 reverses, the external hydraulic oil pump extracts a small amount of hydraulic oil and then stops running, and the electric push rod 310 extends to make the U-shaped frame 340 close to the driving wheel 220. When the driving wheel 220 reverses, the detection columns 261 protruding from either end surface of the driving wheel 220 can push the U-shaped frame 340 to slide, so that the resistance welding joint 230 can be repaired at the missing welding position.

[0047] The repair welding mechanism 300 is symmetrically provided with two groups for controlling the movement of the two inner cone rings 410. After the welding is completed, if it is observed that the multiple detection columns 261 slide relative to the driving wheel 220, the external hydraulic oil pump is first controlled to extract the hydraulic oil in the cylindrical hole, so that the two inner cone rings 410 move away from each other until the value detected by the pressure sensor tends to zero, and then the rotating shaft 210 is controlled to reverse, and the electric push rod 310 is controlled to extend at the same time, so that the U-shaped frame 340 approaches the driving wheel 220. As the driving wheel 220 rotates, the detection column 261 protruding from the driving wheel 220 can push the U-shaped frame 340 to slide, so that the U-shaped frame 340 drives the second piston plate 342 to slide, so that the hydraulic oil in the piston cylinder 330 can flow into the cylindrical hole, so that the first piston plate 430 is pushed, so that the two inner cone rings 410 approach each other, thereby driving the resistance welding head 230 to contact the weld, and repairing the parts with poor welding quality.

[0048] A position sensor for detecting the sliding direction of the U-shaped frame 340 is provided on the slide seat 320. When the position sensor detects that the U-shaped frame 340 slides toward the first end surface direction of the driving wheel 220, the rotation speed of the driving wheel 220 increases; and when the position sensor detects that the U-shaped frame 340 slides toward the second end surface direction of the driving wheel 220, the rotation speed of the driving wheel 220 remains unchanged.

[0049] Since the repairing methods for weld defects caused by high contact pressure and low contact pressure are different, when the position sensor detects that the U-shaped frame 340 slides toward the first end face of the driving wheel 220 due to high contact pressure, the control system controls the rotation speed of the rotating shaft 210 to increase, so that the speed at which the weld moves relative to the resistance welding head 230 increases, thereby reducing the repairing time. Conversely, when repairing weld defects caused by low contact pressure, the rotation speed of the rotating shaft 210 remains unchanged, ensuring that the resistance welding head 230 has enough time to repair the weld.

[0050] The two third oil pipes 350 are both provided with solenoid valves 351. When the electric push rod 310 is shortened, the two solenoid valves 351 are both closed. The two third oil pipes 350 are both connected with a box body 360 between the piston cylinder 330 and the solenoid valve 351. A rectangular plate 361 is connected to the box body 360 through a tension spring 362. The side wall of the rectangular plate 361 fits with the inner wall of the box body 360. When the U-shaped frame 340 slides, the solenoid valve 351 located in the opposite direction of the sliding of the U-shaped frame 340 is closed, and the other solenoid valve 351 is opened.

[0051] In order to avoid pressure relief in the cylindrical hole when the external hydraulic oil pump is started, the two solenoid valves 351 are closed at this time. During the repair welding process, in order to avoid pressure relief in the cylindrical hole, the solenoid valve 351 located in the opposite direction of the sliding of the U-shaped frame 340 is closed, and the other solenoid valve 351 is opened. As a result, when the space in the piston cylinder 330 located in the opposite direction of the second piston plate 342 increases, the negative pressure is transmitted to the corresponding box body 360. At this time, the negative pressure drives the rectangular plate 361 in the box body 360 to overcome the pulling force of the tension spring 362 and slide. The hydraulic oil in the box body 360 flows to the enlarged space of the piston cylinder 330, thereby avoiding the influence of negative pressure on the sliding process of the second piston plate 342.

[0052] The two end surfaces of the U-shaped frame 340 and the driving wheel 220 repel each other magnetically, and when the U-shaped frame 340 is located in the axial middle of the driving wheel 220, the magnetic repulsion is equal; two inclined plates 390 are symmetrically connected to the base 110 on both sides of the electric push rod 310. When the electric push rod 310 is shortened, the inclined plates 390 guide the U-shaped frame 340 to slide so that the second piston plate 342 moves to the middle of the piston cylinder 330.

[0053] In order to reset the U-shaped frame 340, two pressure sensors are further provided at the position of the U-shaped frame 340 that can contact the detection column 261. When the two pressure sensors are not subjected to the pressure of the detection column 261, the two solenoid valves 351 are both opened, so that the U-shaped frame 340 is reset under the action of the magnetic repulsive force, thereby preventing the resistance welding head 230 from contacting the weld without defects. After the electric push rod 310 is shortened, the U-shaped frame 340 can slide on the inclined surface of the inclined plate 390 and be guided, so that the second piston plate 342 slides to the middle position of the piston cylinder 330, and then the two solenoid valves 351 are closed to ensure that the two inner cone rings 410 can be smoothly driven to move during the next repair welding.

[0054] After the repair welding is completed, the slide bar 260 can be manually rotated to reset the detection column 261, or a servo motor and an angle sensor can be set to record the rotation angle of the corresponding slide bar 260, and then the slide bar 260 can be reset by driving the servo motor.

[0055] The device also includes a grinding mechanism 500, which includes a fixed seat 510, and the resistance welding head 230 is inserted into the fixed seat 510. A spring 440 is also provided between the guide rod 450 and the fixed seat 510 to ensure that the resistance welding head 230 can be away from the weld when the two inner cone rings 410 are away from each other.

[0056] The fixing seat 510 is also fixedly connected with a hydraulic rod 520, the output end of the hydraulic rod 520 is connected with a mounting frame 530, the mounting frame 530 is rotatably connected with a grinding roller 540, the grinding roller 540 is driven to rotate by a motor, when the weld is repaired, the hydraulic rod 520 is first controlled to shorten so that the grinding roller 540 is close to the weld, and then the steel pipe and the grinding roller 540 are controlled to rotate, so that the weld is firstly polished, and then the weld is repaired;

[0057] In addition, during the repair welding process, the driving wheel 220 can rotate forward in addition to the reverse rotation.

[0058] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A weld seam intelligent monitoring device, comprising a clamping mechanism (100), characterized in that: It also includes a detection mechanism (200) connected to the clamping mechanism (100), the steel pipe to be welded is inserted into the clamping mechanism (100) and is driven by the clamping mechanism (100) to rotate on a fixed axis, the detection mechanism (200) includes a resistance welding head (230) arranged on the upper part of the weld, and when the steel pipe to be welded rotates, the resistance welding head (230) moves relatively to the weld; The detection mechanism (200) further comprises a rotating shaft (210), to which a driving wheel (220) for driving the steel pipe to be welded is fixedly connected, the rotation speed of the driving wheel (220) is equal to the rotation speed of the steel pipe to be welded, a plurality of detection columns (261) in an annular array are axially slidably connected on the end surface of the driving wheel (220), the plurality of detection columns (261) correspond to the welding points on the weld, the contact pressure between the resistance welding head (230) and the weld can increase or decrease with the fluctuation of the weld surface, the driving wheel (220) has a first end surface and a second end surface, when the contact pressure increases, the detection column (261) at the position corresponding to the weld slides toward the first end surface of the driving wheel (220), and when the contact pressure decreases, the detection column (261) at the position corresponding to the weld slides toward the second end surface of the driving wheel (220).

2. The intelligent weld monitoring device according to claim 1, characterized in that: The detection mechanism (200) further comprises a plurality of sliding rods (260), the plurality of detection columns (261) being respectively connected to the plurality of sliding rods (260), the rotating shaft (210) being fixedly connected with a disk (270), the sliding rod (260) being connected with a threaded rod (262), the disk (270) being provided with a threaded hole cooperating with the threaded rod (262), and when the threaded rod (262) rotates in the threaded hole, the detection column (261) slides on the driving wheel (220).

3. The intelligent weld monitoring device according to claim 2 is characterized in that: The detection mechanism (200) further comprises an electric telescopic rod (240), the output end of the electric telescopic rod (240) being connected to a mounting seat (250), a first rack (251) and a second rack (252) being vertically symmetrically connected to the mounting seat (250), the ends of the plurality of threaded rods (262) being connected to gears (263), a pressure sensor being arranged on the resistance welding head (230), and when the pressure sensor detects that the contact pressure of the resistance welding head (230) is reduced or increased, the electric telescopic rod (240) is synchronously extended or shortened to move the mounting seat (250), so that the first rack (251) or the second rack (252) is meshed with the gear (263) to slide the detection column (261) at a position corresponding to the weld.

4. The intelligent weld monitoring device according to claim 3 is characterized in that: The clamping mechanism (100) comprises a base (110), two supports (120) are symmetrically connected to the base (110), a driven wheel (130) is rotatably connected inside the support (120), the driven wheel (130) is transmission-connected to the driving wheel (220) via a belt, holes for the steel pipe to pass through are provided on the driven wheel (130) and the support (120), an electric clamp is provided inside the driven wheel (130), the electric clamp clamps the steel pipe so that the steel pipe is in a coaxial position with the driven wheel (130).

5. The intelligent weld monitoring device according to claim 4 is characterized in that: The invention also comprises a current control mechanism (400), wherein the current control mechanism (400) comprises inner cone rings (410) symmetrically arranged on both sides of the resistance welding head (230), and two guide rods (450) are symmetrically connected to the resistance welding head (230), and the ends of the two guide rods (450) are respectively abutted against the inner cone surfaces of the two inner cone rings (410), and the two inner cone rings (410) are brought close to each other to drive the resistance welding head (230) to be pressed against the welding seam.

6. The intelligent weld monitoring device according to claim 5, characterized in that: The end surface of the inner cone ring (410) is fixedly connected to a round rod (420), the round rod (420) is inserted into the support (120), the round rod (420) is fixedly connected to a first piston plate (430), the support (120) is provided with a cylindrical hole matched with the first piston plate (430), the cylindrical hole is connected to a first oil pipe (370), the first oil pipe (370) is connected to a second oil pipe (380), the second oil pipe (380) is connected to an external hydraulic oil pump, when the external hydraulic oil pump pumps or extracts hydraulic oil into the cylindrical hole, the two inner cone rings (410) are close to or away from the resistance welding joint (230); When the welding current increases, the external hydraulic oil pump draws hydraulic oil to move the two inner cone rings (410) away from each other, thereby reducing the welding current; and when the welding current decreases, the external hydraulic oil pump pumps hydraulic oil to move the two inner cone rings (410) closer to each other, thereby increasing the welding current.

7. The intelligent weld monitoring device according to claim 6, characterized in that: The invention also comprises a repair welding mechanism (300), wherein the repair welding mechanism (300) comprises an electric push rod (310), wherein the electric push rod (310) is fixedly connected to the base (110), wherein the output end of the electric push rod (310) is fixedly connected to a slide seat (320), wherein the slide seat (320) is fixedly connected to a piston cylinder (330) and slidably connected to a U-shaped frame (340), wherein the U-shaped frame (340) is fixedly connected to a piston rod (341), wherein the end of the piston rod (341) is fixedly connected to a second piston plate (342), wherein the second piston plate (342) slides in the piston cylinder (330), and wherein the piston cylinder (330) is located in the piston cylinder (330). The spaces on both sides of the second piston plate (342) are filled with hydraulic oil and are connected to a third oil pipe (350). The third oil pipe (350) is connected to the first oil pipe (370). When the driving wheel (220) is reversed, the external hydraulic oil pump extracts a small amount of hydraulic oil and stops running, and the electric push rod (310) is extended to make the U-shaped frame (340) close to the driving wheel (220). When the driving wheel (220) is reversed, the detection column (261) protruding from any end surface of the driving wheel (220) can push the U-shaped frame (340) to slide, so that the resistance welding joint (230) is repaired at the missing welding position.

8. The intelligent weld monitoring device according to claim 7, characterized in that: The slide seat (320) is provided with a position sensor for detecting the sliding direction of the U-shaped frame (340); when the position sensor detects that the U-shaped frame (340) slides in the direction of the first end face of the driving wheel (220), the rotation speed of the driving wheel (220) increases; and when the position sensor detects that the U-shaped frame (340) slides in the direction of the second end face of the driving wheel (220), the rotation speed of the driving wheel (220) remains unchanged.

9. The intelligent weld monitoring device according to claim 8, characterized in that: The two third oil pipes (350) are both provided with electromagnetic valves (351), and when the electric push rod (310) is shortened, the two electromagnetic valves (351) are both closed; The two third oil pipes (350) are both connected to a box body (360) between the piston cylinder (330) and the solenoid valve (351). A rectangular plate (361) is connected inside the box body (360) via a tension spring (362). The side wall of the rectangular plate (361) fits with the inner wall of the box body (360). When the U-shaped frame (340) slides, the solenoid valve (351) located in the opposite direction of the sliding of the U-shaped frame (340) is closed, and the other solenoid valve (351) is opened.

10. The intelligent weld monitoring device according to claim 9, characterized in that: The two end surfaces of the U-shaped frame (340) and the driving wheel (220) are magnetically repelled from each other, and when the U-shaped frame (340) is located in the axial middle of the driving wheel (220), the magnetic repulsive forces are equal; Two inclined plates (390) are symmetrically connected to the base (110) on both sides of the electric push rod (310); when the electric push rod (310) is shortened, the inclined plates (390) guide the U-shaped frame (340) to slide so that the second piston plate (342) moves to the middle of the piston cylinder (330).

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