Molten pool stirring mechanism for welding

Abstract

The utility model discloses a molten pool stirring mechanism for welding. The molten pool stirring mechanism comprises a shell and a welding wire withdrawing mechanism arranged in the shell, the welding wire withdrawing mechanism comprises a welding wire withdrawing machine frame, a sliding block installed on the welding wire withdrawing machine frame and a wire feeding pipe connector fixed in the sliding block, a welding wire penetrates through the wire feeding pipe connector, and a driving structure for driving the sliding block to withdraw is further installed on the welding wire withdrawing machine frame. According to the utility model, gas and welding slag in the molten pool during welding can be removed, and the welding efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of welding, in particular to a molten pool stirring mechanism for welding. Background Art

[0002] When metals are welded, a liquid molten pool is formed, and a violent metallurgical reaction occurs, producing certain gases (such as oxygen, carbon monoxide, etc.) and slag. During the solidification process of liquid metal, as the temperature changes, the solubility of some gases such as hydrogen in it will change greatly, which will also cause gas precipitation. Liquid metal is generally viscous, and these gases or impurities are not easy to overflow from the molten pool, which causes welding defects such as pores or slag inclusions. Stirring the molten pool so that the stirring frequency is consistent with the resonance frequency of the molten pool is an effective way to eliminate pores or slag inclusions. Summary of the invention

[0003] In order to solve the above technical problems, a technical solution adopted by the utility model is:

[0004] A welding molten pool stirring mechanism comprises a shell and a welding wire retracting mechanism arranged in the shell;

[0005] The welding wire retraction mechanism includes a frame, a sliding block installed on the frame, and a wire feeding pipe joint fixed in the sliding block. The welding wire passes through the wire feeding pipe joint. A driving structure for driving the sliding block to retract is also installed on the frame.

[0006] Furthermore, the shell includes a lower shell and an upper cover, and the lower shell is fixedly connected to the upper cover.

[0007] Furthermore, the sliding block includes a sliding seat plate that slides on the frame through a slide rail and a pin installed on the sliding seat plate. A first elastic element is provided at the bottom of the pin, and the first elastic element is used to reset the pin. A receiving hole is also provided on the sliding seat plate.

[0008] Furthermore, the driving structure includes a driving element and a ratchet element connected to the output end of the driving element, the ratchet element is provided with an eccentric eccentric shaft, the eccentric shaft is located in the accommodating hole, when the ratchet element rotates, the eccentric shaft can drive the sliding seat plate to slide back and forth, half of the thickness of the circumference of the ratchet element is a protrusion, and one side of the circumference is provided with a ratchet wheel with a length of more than half a circumference, the protrusion is used to press the pin, when the protrusion presses the pin, the pin is pressed down to press the welding wire, The welding wire is pulled back, and when the protrusion leaves, the pin rebounds under the action of the first elastic element to release the welding wire, and the welding wire continues to be fed forward under the action of the wire feeding mechanism; when the reset rod moves downward, the pawl moves downward, and the ratchet element rotates an angle, and when the reset rod moves upward, the pawl is reset by the third elastic element, and when the reset rod moves downward again, the ratchet element rotates again, and this is repeated many times. After all the teeth are moved by the pawl, the protrusion on the ratchet rotates over the pin, releasing the welding wire without affecting the feeding or retraction of the welding wire.

[0009] Furthermore, the welding wire retraction mechanism also includes a reset structure;

[0010] The reset structure includes a reset seat fixedly connected to the welding wire retraction frame and a reset rod sliding upward / downward in the reset seat, the reset rod is sleeved with a second elastic element for resetting, and the reset rod is also rotatably connected to a pawl, the pawl is connected to the reset rod through a third elastic element, and the pawl is used to engage the ratchet of the ratchet element.

[0011] Beneficial effects of the utility model:

[0012] The installation position of the utility model is close to the end of the welding gun, and the eccentric shaft can drive the sliding seat plate to slide back and forth, and the ratchet element is provided with a protrusion. When the protrusion presses the pin, the pin is pressed down to press the welding wire, and the welding wire is withdrawn. When the protrusion leaves, the pin rebounds under the action of the first elastic element to loosen the welding wire. Therefore, during welding, the welding wire can be repeatedly fed and withdrawn in the molten pool while feeding the wire, which plays a stirring role on the molten pool and drives the resonance of the molten pool. It can effectively eliminate welding defects such as pores and slag inclusions. At the same time, due to the vibration of the molten pool, the effect of surface tension is eliminated, the liquid metal is better wetted on both sides of the groove, the weld is flatter, and it is more conducive to all-position welding. The moving parts of the utility model are small, and the jitter of other parts caused by the reciprocating motion is also small, which is conducive to the stability of the welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is an overall schematic diagram;

[0015] Figure 2 It is a schematic diagram of the welding wire retraction mechanism;

[0016] Figure 3 It is a schematic diagram of the sliding block;

[0017] Figure 4 is a schematic diagram of the reset structure;

[0018] Figure 5 It is a cross-sectional schematic diagram of the wire pressing mechanism;

[0019] Figure 6 is a schematic diagram of a ratchet element;

[0020] Description of reference numerals:

[0021] 1. Shell; 11. Lower shell; 12. Upper cover; 2. Wire retracting mechanism; 21. Frame; 22. Drive; 221. Drive element; 222. Ratchet element; 222-1. Eccentric shaft; 222-2. Protrusion; 222-3. Ratchet; 23. Sliding block; 231. Sliding seat plate; 232. Slide rail; 233. Pin; 234. First elastic element; 235. Accommodating hole; 24. Wire feeding tube joint; 25. Reset structure; 251. Reset seat; 252. Reset rod; 253. Second elastic element; 254. Ratchet; 255. Third elastic element; 3. Welding wire. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention. Specific embodiments

[0023] like Figures 1 to 6 As shown, a molten pool stirring mechanism for welding includes a shell 1 and a welding wire retracting mechanism 2 arranged in the shell 1; specifically, the shell 1 includes a lower shell 11 and an upper cover 12, and the lower shell 11 is fixedly connected to the upper cover 12.

[0024] The welding wire retracting mechanism 2 includes a frame 21, a wire feeding block 23 mounted on the frame 21, and a wire feeding pipe joint 24 fixed in the sliding block 23. The welding wire is located in the wire feeding pipe joint 24. A driving structure 22 for driving the sliding block 23 to feed the wire is also installed on the frame 21. Specifically, the sliding block 23 includes a sliding seat plate 231 that slides on the frame 21 through a slide rail 232 and a pin 233 mounted on the sliding seat plate 231. A first elastic element 234 is provided at the bottom of the pin 233. The first elastic element 234 is used to reset the pin 233. A receiving hole 235 is also provided on the sliding seat plate 231. Specifically, the driving structure 22 includes a driving element 221 and a ratchet element 222 connected to the output end of the driving element 221, the ratchet element 222 is provided with an eccentric eccentric shaft 222-1, the eccentric shaft 222-1 is located in the accommodating hole 235, when the ratchet element 222 rotates, the eccentric shaft can drive the sliding seat plate 231 to slide back and forth, half of the thickness of the circumference of the ratchet element 222 is a protrusion 222-2, and a half-circle ratchet 222-3 is provided on one side of the circumference, the protrusion 222-2 is used to press the pin 233, when the protrusion 222-2 presses the pin 233, the pin 233 is pressed down to press the welding wire 3, when the protrusion 222-2 leaves, the pin 233 rebounds under the action of the first elastic element 234 to release the welding wire 3. When the protrusion presses the pin, the pin is pressed down to press the welding wire and pull the welding wire back. When the protrusion leaves, the pin rebounds under the action of the first elastic element, releasing the welding wire, and the welding wire continues to be fed forward under the action of the wire feeding mechanism.

[0025] Specifically, the welding wire retraction mechanism 2 also includes a reset structure 25; the reset structure 25 includes a reset seat 251 fixedly connected to the frame 21 and a reset rod 252 that slides upward / downward in the reset seat 251, and the reset rod 252 is covered with a second elastic element 253 for resetting, and the reset rod 252 is also rotatably connected to a pawl 254, and the pawl 254 is connected to the reset rod 252 through a third elastic element 255, and the pawl 254 is used to engage the ratchet 222-3 of the ratchet element 222.

[0026] The function of the reset structure 25 is that when the welding wire needs to be refilled or the position of the welding wire needs to be adjusted, if the motor stops and the protrusion presses against the pin, the pin will block the wire feeding hole or press the welding wire, resulting in the welding wire being unable to be withdrawn or new welding wire being unable to be filled. At this time, the reset rod can be pressed, and the pawl 254 drives the ratchet element 222 to rotate. When released, the reset rod returns to its position. Multiple presses can drive the ratchet element to rotate, so that the protrusion leaves the pin and the pin leaves the wire feeding hole.

[0027] A welding wire retraction device is set near the end of the welding gun. When the welding wire is fed into the molten pool, the molten pool is pushed backwards and then the welding wire is retracted. Due to surface tension, the welding wire can drive the molten pool forward. Repeated pushing and pulling makes the molten pool vibrate back and forth, thereby stirring the molten pool. By adjusting the pushing and pulling frequency to make it close to the resonant frequency of the molten pool, the stirring effect is improved, the purpose of eliminating welding pores and slag inclusions is achieved, and the welding quality is improved.

[0028] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, is also included in the patent protection scope of the present invention.

Claims

1. A welding molten pool stirring mechanism, characterized in that: It comprises a housing (1) and a welding wire retracting mechanism (2) arranged in the housing (1); The welding wire retracting mechanism (2) comprises a frame (21), a sliding block (23) mounted on the frame (21), and a wire feeding pipe joint (24) fixed in the sliding block (23); the welding wire (3) passes through the wire feeding pipe joint (24); and a driving structure (22) for driving the sliding block (23) to reciprocate is also mounted on the frame (21).

2. A welding molten pool stirring mechanism according to claim 1, characterized in that: The housing (1) comprises a lower shell (11) and an upper cover (12), wherein the lower shell (11) is fixedly connected to the upper cover (12).

3. A welding molten pool stirring mechanism according to claim 1, characterized in that: The sliding block (23) comprises a sliding seat plate (231) that slides on the frame (21) via a sliding rail (232) and a pin (233) mounted on the sliding seat plate (231); a first elastic element (234) is provided at the bottom of the pin (233); the first elastic element (234) is used to reset the pin (233); and a receiving hole (235) is also provided on the sliding seat plate (231).

4. A welding molten pool stirring mechanism according to claim 3, characterized in that: The driving structure (22) comprises a driving element (221) and a ratchet element (222) connected to an output end of the driving element (221); the ratchet element (222) is provided with an eccentric eccentric shaft (222-1); the eccentric shaft (222-1) is located in the accommodating hole (235); when the ratchet element (222) rotates, the eccentric shaft can drive the sliding seat plate (231) to slide back and forth; half of the thickness of the circumference of the ratchet element (222) is the thickness of the protrusion (222-1). 2), a ratchet (222-3) having a length of more than half a circle is provided on one side of the circumference of the body, the protrusion (222-2) is used to press the pin (233), when the protrusion (222-2) presses the pin (233), the pin (233) is pressed down to press the welding wire (3), and the welding wire (3) is pulled back, when the protrusion (222-2) leaves, the pin (233) rebounds under the action of the first elastic element, and the welding wire (3) is released, and the welding wire (3) continues to be fed forward under the action of the wire feeding mechanism.

5. A welding molten pool stirring mechanism according to claim 4, characterized in that: The welding wire retracting mechanism (2) further comprises a reset structure (25); The reset structure (25) comprises a reset seat (251) fixedly connected to the frame (21) and a reset rod (252) sliding upward / downward in the reset seat (251); the reset rod (252) is sleeved with a second elastic element (253) for resetting; the reset rod (252) is also rotatably connected to a pawl (254); the pawl (254) is connected to the reset rod (252) via a third elastic element (255); the pawl (254) is used to engage the ratchet element (22 2) ratchet (222-3); when the reset rod (252) moves downward, the pawl (254) moves downward, driving the ratchet element (222) to rotate by an angle; when the reset rod (252) moves upward, the pawl (254) is reset by the third elastic element; when the reset rod (252) moves downward again, the ratchet element (222) is rotated again; this is repeated multiple times; after all teeth are moved by the pawl, the protrusion (222-2) on the ratchet rotates past the pin (233), releasing the welding wire without affecting the feeding or retraction of the welding wire (3).

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