Wire feeding device of gas metal arc welding gun

Abstract

The utility model discloses a wire feeding device of a gas metal arc welding gun, which belongs to the technical field of welding equipment and comprises a workbench, a discharging shaft lever, a tension sensing mechanism and a wire feeding mechanism are sequentially arranged at the top of the workbench, and one end of the discharging shaft lever is connected with a driving motor. The tension sensing mechanism comprises a guide pulley, the guide pulley is movably connected with a first pulley yoke through a shaft rod, the bottom of the first pulley yoke is provided with a sliding rod extending downwards and a displacement sensing mechanism, the bottom end of the sliding rod penetrates into the displacement sensing mechanism from the top end of the displacement sensing mechanism, and the sliding rod is sleeved with a compression spring; the wire feeding mechanism comprises a driving wire feeding wheel and a driven wire feeding wheel which are adjacent to each other; the driving wire feeding wheel is connected with another driving motor through a shaft rod; the tension sensing mechanism is matched with the discharging shaft rod and the driving motor, so that the tension of the welding wire is kept stable in the conveying process, and the welding quality of the gas metal arc welding gun can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of welding equipment, in particular to a wire feeding device of a metal-electrode gas shielded welding gun. Background Art

[0002] Gas metal arc welding is an important welding method. It uses the arc generated between the welding wire and the workpiece as a heat source to melt the metal and achieve welding. The welding wire is fed into the welding gun at a constant speed and stable tension through the control of the wire feeder, and then guided to the welding area through the wire guide tube inside the welding gun. Keeping the welding wire straight and having appropriate tension during the wire feeding process is conducive to improving the welding quality. At present, the wire feeder usually uses a shaft and other structures to fix the welding wire coil. The rotation of the wire feeding wheel generates a pulling force on the welding wire to rotate the welding wire coil and release the welding wire. If the shaft that fixes the welding wire coil does not rotate smoothly, the tension of the welding wire will be increased. If the shaft rotates too smoothly, the welding wire coil will release too much welding wire due to the rotational inertia, which will reduce the tension of the welding wire, thereby causing the tension of the welding wire to be stable. At present, some wire feeders release the welding wire by driving the shaft to rotate by a driving motor. However, with the use of the welding wire coil, the welding wire released per rotation of the welding wire coil will become less and less, resulting in the difficulty of matching the rotation speed of the welding wire coil with the wire feeding wheel, and also causing the tension of the welding wire to be unstable, thereby affecting the welding quality.

[0003] A Chinese patent with publication number CN203738256U discloses a wire feeding device for welding equipment, including a wire feeding mechanism for conveying welding wire and a welding wire position adjustment mechanism arranged on a welding gun, the welding wire position adjustment mechanism including an adjustment bracket and a hollow cylindrical Y-axis rotation adjustment mechanism sleeved on the outside of the adjustment bracket, which is fastened by a first hexagon socket screw, the Y-axis rotation adjustment mechanism has an opening on the side, the welding wire position adjustment mechanism also includes an X-axis rotation adjustment mechanism with one end clamped in the opening, the X-axis rotation adjustment mechanism is fastened to the Y-axis rotation adjustment mechanism by a second hexagon socket screw, the welding gun is fixed to the other end of the X-axis rotation adjustment mechanism, and the welding wire position adjustment mechanism also includes a welding gun locking device for fixing the welding gun to the adjustment bracket.

[0004] The above-mentioned wire feeding device can achieve precise positioning of the welding wire and can smoothly complete the feeding of the welding wire. However, whether the welding wire is released through the tension generated by the operation of the wire feeding mechanism or by the rotation of the wire reel driven by the motor to release the welding wire, the wire feeding device is difficult to control the stability of the welding wire tension during the wire feeding process, which is easy to affect the welding effect. Therefore, there is still room for improvement. Utility Model Content

[0005] In view of the technical defects existing in the background technology, the utility model proposes a wire feeding device for a metal-electrode gas shielded welding gun, which solves the above technical problems and meets the actual needs. The specific technical solution is as follows:

[0006] A wire feeding device for a metal-metal gas shielded welding gun comprises a workbench, a discharge shaft, a tension sensing mechanism and a wire feeding mechanism are sequentially arranged on the top of the workbench, one end of the discharge shaft is connected to a driving motor; the tension sensing mechanism comprises the following structures: a guide pulley, the guide pulley is movably connected to a first pulley frame through a shaft, a sliding rod extending downward is arranged at the bottom of the first pulley frame, and a displacement sensing mechanism, the bottom end of the sliding rod passes through the top of the displacement sensing mechanism to the inside of the displacement sensing mechanism, a compression spring is arranged on the outer sleeve of the sliding rod, and the two ends of the compression spring are respectively abutted against the bottom of the first pulley frame and the top of the displacement sensing mechanism;

[0007] The wire feeding mechanism includes the following structure: adjacent active wire feeding wheels and driven wire feeding wheels, a gap for allowing welding wire to pass through is provided between the radial surfaces of the active wire feeding wheels and the driven wire feeding wheels, and the active wire feeding wheels are connected to another driving motor through a shaft rod.

[0008] As a further technical solution of the utility model, the displacement sensing mechanism includes the following structure: a fixed shell fixedly connected to the top of the workbench, the interior of the fixed shell is hollow to form a sensing cavity, the top of the sensing cavity is provided with a first sensor and a first receiver that match each other, and the bottom of the sensing cavity is provided with a second sensor and a second receiver that match each other.

[0009] As a further technical solution of the utility model, a welding wire sensing mechanism is provided between the displacement sensing mechanism and the wire feeding mechanism, and the welding wire sensing mechanism comprises a sensing element and side slide plates on both sides of the sensing element.

[0010] As a further technical solution of the utility model, the driven wire feeding wheel is movably connected to the second pulley frame through an axial rod, the second pulley frame is provided with a movable push rod at one end away from the driven wire feeding wheel, the movable end of the movable push rod is fixedly connected to the second pulley frame, and the fixed end of the movable push rod is provided with a fixed bracket fixedly connected to the workbench.

[0011] As a further technical solution of the utility model, a control base with a hollow interior is provided at the bottom of the workbench, and the drive motor connected to the discharge shaft and the active wire feeding wheel is located inside the control base.

[0012] As a further technical solution of the utility model, the end of the discharge shaft rod is sleeved with a fixing clamp and a fixing nut, and the surface of the discharge shaft rod is provided with a thread matching the fixing nut.

[0013] As a further technical solution of the utility model, two adjacent guide rollers are provided between the discharge shaft and the tension sensing mechanism, and the guide rollers are movably connected to a guide bracket fixedly connected to the workbench through the shaft.

[0014] The beneficial effects of the utility model are:

[0015] The utility model senses the change of welding wire tension through a displacement sensing mechanism to cause the displacement of a guide pulley and a sliding rod, thereby judging the tension change trend of the welding wire, and controls the rotation speed of a discharge shaft through a driving motor to adjust the speed of welding wire discharge. During the conveying process, the tension of the welding wire is kept within a certain range and in a straight state, so that the wire feeding mechanism can smoothly convey the welding wire to the welding gun for welding, thereby improving the welding quality of the metal electrode gas shielded welding gun. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a structural schematic diagram of a wire feeding device of a metal electrode gas shielded welding gun.

[0017] Figure 2 The present invention is a structural schematic diagram of a tension sensing mechanism of a wire feeding device of a metal electrode gas shielded welding gun.

[0018] Figure 3 The invention discloses a structural schematic diagram of a wire feeding mechanism of a wire feeding device of a metal electrode gas shielded welding gun.

[0019] Wherein: workbench 1, control base 11, discharge shaft 2, fixed splint 21, fixed nut 22, tension sensing mechanism 3, guide pulley 31, first pulley frame 32, sliding rod 33, displacement sensing mechanism 34, fixed shell 341, sensing chamber 342, first sensor 343, first receiver 344, second sensor 345, second receiver 346, compression spring 35, wire feeding mechanism 4, active wire feeding wheel 41, driven wire feeding wheel 42, second pulley frame 43, movable push rod 44, fixed bracket 45, welding wire sensing mechanism 5, sensing element 51, side slide plate 52, guide roller 6, guide bracket 7. DETAILED DESCRIPTION

[0020] The implementation methods of the present invention are described below in conjunction with the accompanying drawings and relevant embodiments. The implementation methods of the present invention are not limited to the following embodiments, and the present invention involves relevant necessary components in this technical field, which should be regarded as common knowledge in this technical field and can be known and mastered by technical personnel in this technical field.

[0021] like Figure 1-3As shown, a wire feeding device of a metal-metal gas shielded welding gun comprises a workbench 1, a discharge shaft rod 2, a tension sensing mechanism 3, and a wire feeding mechanism 4 are sequentially arranged on the top of the workbench 1, and a driving motor is connected to one end of the discharge shaft rod 2; the tension sensing mechanism 3 comprises the following structures: a guide pulley 31, the guide pulley 31 is movably connected to a first pulley frame 32 through a shaft rod, a sliding rod 33 extending downward is arranged at the bottom of the first pulley frame 32, and a displacement sensing mechanism 34, the bottom end of the sliding rod 33 passes through the top of the displacement sensing mechanism 34 to the inside of the displacement sensing mechanism 34, and the sliding rod 3 The outer sleeve is provided with a compression spring 35, and the two ends of the compression spring 35 are respectively abutted against the bottom of the first pulley frame 32 and the top of the displacement sensing mechanism 34; the wire feeding mechanism 4 includes the following structures: adjacent active wire feeding wheels 41 and driven wire feeding wheels 42, and a gap is provided between the radial surfaces of the active wire feeding wheels 41 and the driven wire feeding wheels 42 to allow the welding wire to pass through, and the active wire feeding wheel 41 is connected to another driving motor through the shaft; the bottom of the workbench 1 is provided with a control base 11 with a hollow interior, and the driving motor connected to the discharge shaft 2 and the active wire feeding wheel 41 are both located inside the control base 11.

[0022] The utility model is used for conveying welding wire for a metal-electrode gas shielded welding gun, and a servo system for controlling the operation of a wire feeding device is also provided inside a control base 11; in the utility model, a discharge shaft 2 is used for inserting a sleeve and fixing a welding wire coil, and a driving motor drives the discharge shaft 2 to rotate through a gear transmission or the like, so that the welding wire coil rotates synchronously and discharges the welding wire, and after the welding wire is discharged, it passes through the top of a guide pulley 31 and extends to a wire feeding mechanism 4, and the guide pulley 31 rotates in a first pulley frame 32 through a shaft, so that the welding wire is smoothly conveyed, and then the welding wire is conveyed from an active wire feeding wheel 41 and a wire feeding mechanism 4, and then the welding wire is conveyed from a first ... The driven wire feeding wheel 42 passes through the active wire feeding wheel 41 and the driven wire feeding wheel 42, the surfaces of the active wire feeding wheel 41 and the driven wire feeding wheel 42 are both in contact with the surface of the welding wire and clamp it, the driving motor rotates the active wire feeding wheel 41 through gear transmission and the like, and during the rotation of the active wire feeding wheel 41, a pulling force is generated through the friction between the active wire feeding wheel 41 and the welding wire, and the driven wire feeding wheel 42 rotates synchronously under the action of the friction force, thereby realizing the transportation of the welding wire, and a wire guide tube connected to the welding gun is provided on the side of the wire feeding mechanism 4 away from the tension sensing mechanism 3, and the wire feeding mechanism 4 transports the welding wire along the wire guide tube to the welding gun to realize continuous welding.

[0023] The horizontal height of the gap between the active wire feeding wheel 41 and the driven wire feeding wheel 42 is lower than the top of the guide pulley 31. When there is tension in the wire feeding process, the wire will exert downward pressure on the guide pulley 31, causing the sliding rod 33 to move downward. The greater the tension of the wire, the greater the displacement of the sliding rod 33 downward. The displacement sensing mechanism 34 can optionally use a displacement sensor to judge whether the tension of the wire tends to increase or decrease by sensing the displacement of the sliding rod 33 downward. When the tension of the wire increases or is too high, the servo system can be used to control the drive motor connected to the discharge shaft 2 to slowly increase the tension. High rotation speed increases the speed at which the welding wire reel pays out the welding wire, thereby reducing the tension of the welding wire. When the welding wire tension is reduced, the compression spring 35 will release the elastic force to move the guide pulley 31 upward. When the welding wire tension is reduced or too low, the rotation speed of the drive motor connected to the discharge shaft 2 is reduced, and the speed at which the welding wire reel pays out the welding wire is slowed down, thereby increasing the tension of the welding wire. The utility model cooperates the tension sensing mechanism 3 with the discharge shaft 2 and the drive motor that controls the rotation of the discharge shaft 2, so that the welding wire remains straight during the transportation process and the tension is maintained within a certain range, which can improve the welding quality of the metal electrode gas shielded welding gun.

[0024] like Figure 1 , 2 As shown, as one of the preferred embodiments of the utility model, the displacement sensing mechanism 34 includes the following structure: a fixed shell 341 fixedly connected to the top of the workbench 1, the interior of the fixed shell 341 is hollow to form a sensing cavity 342, a first sensor 343 and a first receiver 344 that match each other are provided on the top of the sensing cavity 342, and a second sensor 345 and a second receiver 346 that match each other are provided on the bottom of the sensing cavity 342.

[0025] The displacement sensing mechanism 34 of the utility model determines the tension of the welding wire by sensing the displacement of the sliding rod 33. A through hole matching the sliding rod 33 is provided on the top of the fixed shell 341. After the sliding rod 33 passes through the through hole, it reciprocates in the vertical direction in the sensing chamber 342. The first sensor 343 and the second sensor 345 are preferably infrared reflectors, and the first receiver 344 and the second receiver 346 are preferably infrared receivers. When the welding wire tension is within a normal range, the bottom of the sliding rod 33 is located between the first sensor 343 and the first receiver 344. When the first receiver 344 cannot receive the infrared rays emitted by the first sensor 343 and the second receiver 346 can receive the infrared rays emitted by the second sensor 345, the tension of the welding wire is within a normal range. When the welding wire tension increases, the sliding rod 33 moves downward to the position where its bottom is located between the second sensor 345 and the second receiver When the tension of the welding wire decreases, the sliding rod 33 moves upward until its bottom is located above the position between the first sensor 343 and the first receiver 344, and the first receiver 344 can receive the infrared rays emitted by the first sensor 343. At this time, the tension sensing mechanism 3 will determine that the tension of the welding wire is too low, and it is necessary to reduce the rotation speed of the welding wire coil to reduce the speed of the welding wire release until the first receiver 344 cannot receive the infrared rays emitted by the first sensor 343. The tension sensing mechanism 3 is used to control the tension of the welding wire within a certain range to avoid excessive or low tension of the welding wire affecting the welding quality.

[0026] like Figure 1 , 3 As shown, as one of the preferred embodiments of the utility model, a welding wire sensing mechanism 5 is provided between the displacement sensing mechanism 34 and the wire feeding mechanism 4 , and the welding wire sensing mechanism 5 includes a sensing element 51 and side slide plates 52 on both sides of the sensing element 51 .

[0027] The welding wire sensing mechanism 5 of the utility model is used to determine whether the welding wire in the welding wire coil is completely released. The sensing element 51 preferably adopts an inductive sensor. When the welding wire in the welding wire coil is completely released, the end of the welding wire will fall downward to the surface of the sensing element 51 after the welding wire is transported to the position between the displacement sensing mechanism 34 and the wire feeding mechanism 4. The side slide plate 52 can make the end of the welding wire fall on the surface of the sensing element 51 more accurately. When the welding wire contacts the surface of the sensing element 51, the induced current inside the sensing element 51 will change between the coils, generating an induction signal, thereby judging that the welding wire coil has been completely released. The servo can also notify the worker to replace the new welding wire coil in a specific way.

[0028] like Figure 1 , 3 As shown, as one of the preferred embodiments of the utility model, the driven wire feeding wheel 42 is movably connected to the second pulley frame 43 through an axial rod, and the second pulley frame 43 is provided with a movable push rod 44 at one end away from the driven wire feeding wheel 42, and the movable end of the movable push rod 44 is fixedly connected to the second pulley frame 43, and the fixed end of the movable push rod 44 is provided with a fixed bracket 45 fixedly connected to the workbench 1.

[0029] The driven wire feeding wheel 42 rotates on the movable push rod 44 through the shaft, so that the welding wire can be transported under the action of the friction force generated by the rotation of the active wire feeding wheel 41. The movable push rod 44 is preferably an electric push rod, and a fixed bracket 45 fixed to the workbench 1 provides support for the movable push rod 44. The movable push rod 44 can push the driven wire feeding wheel 42 to reciprocate and adjust the distance between the driven wire feeding wheel 42 and the active wire feeding wheel 41, so as to match welding wires of different sizes.

[0030] like Figure 1 As shown, as one of the preferred embodiments of the utility model, the end of the discharge shaft rod 2 is sleeved with a fixing clamp 21 and a fixing nut 22, and the surface of the discharge shaft rod 2 is provided with a thread matching the fixing nut 22.

[0031] The unloading shaft 2 of the utility model is used to insert and fix the welding wire coil, which consists of a coil core and welding wire wound on the coil core. A through hole is provided at the axis of the coil core, through which the welding wire coil is sleeved on the unloading shaft 2, and then the fixing clamp 21 is sleeved on the unloading shaft 2, and finally the fixing nut 22 is sleeved on the unloading shaft 2 and the fixing nut 22 is tightened so that the fixing clamp 21 fixes the welding wire coil on the unloading shaft 2.

[0032] like Figure 1 As shown, as one of the preferred embodiments of the utility model, two adjacent guide rollers 6 are provided between the unloading shaft 2 and the tension sensing mechanism 3, and the guide rollers 6 are movably connected to a guide bracket 7 fixedly connected to the workbench 1 through the shaft.

[0033] The two guide rollers 6 of the utility model extend in a vertical direction and have a gap between them to allow the welding wire to pass through. The guide bracket 7 provides support for the guide roller 6 and allows the guide roller to rotate. The two guide rollers 6 can keep the welding wire in a straight line in a specified direction and enter the tension sensing mechanism 3 to prevent the welding wire from detaching from the top surface of the guide pulley 31.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A wire feeding device for a metal-metal gas shielded welding gun, comprising a workbench (1), characterized in that: The top of the workbench (1) is provided with a discharge shaft (2), a tension sensing mechanism (3), and a wire feeding mechanism (4) in sequence, and one end of the discharge shaft (2) is connected to a driving motor; the tension sensing mechanism (3) comprises the following structures: a guide pulley (31), the guide pulley (31) is movably connected to a first pulley frame (32) via a shaft, a sliding rod (33) extending downward is provided at the bottom of the first pulley frame (32), and a displacement sensing mechanism (34), the bottom end of the sliding rod (33) passes through the top of the displacement sensing mechanism (34) to the inside of the displacement sensing mechanism (34), and a compression spring (35) is provided on the outer sleeve of the sliding rod (33), and the two ends of the compression spring (35) are respectively in contact with the bottom of the first pulley frame (32) and the top of the displacement sensing mechanism (34); The wire feeding mechanism (4) comprises the following structure: an adjacent active wire feeding wheel (41) and a driven wire feeding wheel (42); a gap allowing the welding wire to pass through is provided between the radial surfaces of the active wire feeding wheel (41) and the driven wire feeding wheel (42); and the active wire feeding wheel (41) is connected to another driving motor via a shaft.

2. The wire feeding device of the metal-metal gas shielded welding gun according to claim 1, characterized in that: The displacement sensing mechanism (34) comprises the following structure: a fixed shell (341) fixedly connected to the top of the workbench (1); the fixed shell (341) is hollow inside to form a sensing cavity (342); a first sensor (343) and a first receiver (344) that match each other are provided at the top of the sensing cavity (342); and a second sensor (345) and a second receiver (346) that match each other are provided at the bottom of the sensing cavity (342).

3. The wire feeding device of the metal-metal gas shielded welding gun according to claim 1, characterized in that: A welding wire sensing mechanism (5) is provided between the displacement sensing mechanism (34) and the wire feeding mechanism (4), wherein the welding wire sensing mechanism (5) comprises a sensing element (51) and side slide plates (52) on both sides of the sensing element (51).

4. The wire feeding device of the metal-metal gas shielded welding gun according to claim 1, characterized in that: The driven wire feeding wheel (42) is movably connected to the second pulley frame (43) via a shaft, and a movable push rod (44) is provided at one end of the second pulley frame (43) away from the driven wire feeding wheel (42), and the movable end of the movable push rod (44) is fixedly connected to the second pulley frame (43), and the fixed end of the movable push rod (44) is provided with a fixed bracket (45) fixedly connected to the workbench (1).

5. The wire feeding device of the metal-metal gas shielded welding gun according to claim 1, characterized in that: A control base (11) with a hollow interior is provided at the bottom of the workbench (1), and a drive motor connected to the discharge shaft (2) and the active wire feeding wheel (41) is located inside the control base (11).

6. The wire feeding device of the metal-metal gas shielded welding gun according to claim 1, characterized in that: The end of the discharge shaft rod (2) is sleeved with a fixing clamp (21) and a fixing nut (22), and the surface of the discharge shaft rod (2) is provided with a thread matching the fixing nut (22).

7. The wire feeding device of the metal-metal gas shielded welding gun according to claim 1, characterized in that: Two adjacent guide rollers (6) are provided between the discharge shaft (2) and the tension sensing mechanism (3), and the guide rollers (6) are movably connected to a guide bracket (7) fixedly connected to the workbench (1) via the shaft.

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