Internal welding device

Abstract

The present invention provides an internal welding device, which relates to the technical field of welding devices and solves the technical problem that the welding gun of the welding device does not align with the weld seam, resulting in poor weld quality and poor welding. The device includes a vehicle body, a swing arm, and a welding gun. The swing arm is rotatably connected to the vehicle body, and the welding gun is located on the swing arm. The swing arm gradually extends away from the vehicle body axis along the vehicle body's travel direction. The swing arm is provided with a guide wheel, which is inclined relative to the vehicle body axis. When the vehicle body moves within the U-rib, the guide wheel can pull the swing arm in a direction away from the vehicle body axis to align the wire outlet position of the welding gun with the weld seam. When the vehicle body moves along the bottom plate inside the U-rib, the rotating guide wheel can pull the swing arm in a direction away from the vehicle body axis, that is, pull the swing arm toward the side plate of the U-rib, so that the wire outlet position of the welding gun is aligned with the weld seam, preventing the wire outlet position of the welding gun from not contacting the weld seam, resulting in poor weld, thereby improving welding quality.

Description

Technical Field

[0001] The present invention relates to the field of welding technology, in particular to an internal welding device. Background Art

[0002] U-rib is a standard component of traditional bridge steel structure and is widely used in bridge steel structure. Figure 1 As shown, Figure 1 This is a schematic diagram of the cross-sectional structure of a U-rib structural unit; during the manufacturing process, side panels 101 and bottom panel 102 need to be welded. Given the small cross-sectional dimensions and slender structure of the U-rib, the welding difficulty is often challenged. Traditionally, the welds between the U-rib side panels and bottom panel are welded on one side on the outside, leaving the inside unwelded. This relatively simple welding process results in poor weld quality and is prone to weld quality issues.

[0003] In order to improve welding quality, there are some devices in the prior art for welding from the inside of the U rib. The welding device includes a welding gun, and a wire feeding device is located outside the U rib to feed wire for the welding device. The welding device can move inside the U rib and use the welding gun to weld from the inside of the U rib.

[0004] The applicant has discovered that the prior art has at least the following technical problems:

[0005] 1. The weld of the U-rib is deformed and bent during production. When the welding device moves inside the U-rib, the welding gun is in a fixed position, and it is difficult for the welding gun to completely fit the weld, resulting in a cold weld and affecting the welding quality.

[0006] 2. The wire feeding device is located outside the U-rib and feeds the wire for the welding device running inside the U-rib. The welding wire extends for a long time, resulting in a waste of welding wire. In addition, the welding device pulls the welding wire, which easily leads to uneven wire feeding, tangling and wire breakage. Summary of the Invention

[0007] The present invention aims to provide an internal welding device to address the technical issues of prior art welding devices, such as the misalignment between the welding torch and the weld seam, which results in poor weld quality and poor solder joints. The various technical effects achieved by the preferred technical solutions provided by the present invention are detailed below.

[0008] To achieve the above objectives, the present invention provides the following technical solutions:

[0009] The present invention provides an internal welding device, comprising a vehicle body, a swing arm and a welding gun, wherein:

[0010] The swing arm is rotatably connected to the vehicle body, the welding gun is located on the swing arm, and the swing arm gradually extends away from the vehicle body axis along the moving direction of the vehicle body;

[0011] A guide wheel is provided on the swing arm, and the guide wheel is inclined relative to the axis of the vehicle body. When the vehicle body moves in the U rib, the guide wheel can pull the swing arm in a direction away from the axis of the vehicle body, so that the wire outlet position of the welding gun is aligned with the weld.

[0012] Preferably, an adsorption portion is provided at the bottom of the swing arm, and the adsorption portion is used to make the swing arm fit with the bottom plate of the U rib when the vehicle body is moving.

[0013] Preferably, a rotating member is provided on the vehicle body, a limiting ring is fixed to the side of the rear end of the vehicle body, an annular cavity is formed on the limiting ring, and the annular cavity is vertically arranged; the rotating member is fixedly connected to a column, the column extends into the annular cavity, and can rotate along the annular cavity in a vertical plane;

[0014] A limiting groove is provided on the rotating member, and the end of the swing arm facing away from the welding gun is located in the limiting groove and is rotatably connected to the limiting groove. The limiting groove is used to limit the rotation angle of the swing arm on the horizontal plane.

[0015] Preferably, a seat and an elastic part are provided on the vehicle body, wherein: the seat is fixed on the vehicle body, one end of the elastic part is fixed in the seat, and the other end rests on the upper surface of the rotating part, for pushing the rotating part to fit with the bottom plate of the U rib.

[0016] Preferably, the swing arm is provided with a vertical adjustment assembly, which includes a guide groove, a slider and an adjustment screw, wherein:

[0017] The guide groove is fixed on the swing arm and is vertically arranged. The slider is slidably connected to the guide groove. The welding gun is connected to the slider. The adjusting screw is vertically arranged and threadedly connected to the slider. Rotating the adjusting screw can drive the slider to move back and forth in the vertical direction.

[0018] Preferably, the swing arm is provided with a rotation adjustment assembly, which includes a connecting column and a clamp, wherein:

[0019] The connecting post is fixed on the slider and arranged horizontally. The clamp is connected to the welding gun. A clamping cavity is formed on the clamp. The connecting post extends into the clamping cavity and is connected to the clamp.

[0020] The clamp has an open side, which is connected to the clamping cavity. Adjusting the size of the open side can adjust the size of the clamping cavity, so that the clamp drives the welding gun to rotate in a vertical plane with the connecting column as the axis.

[0021] Preferably, the vehicle body is provided with a wire reel and a wire feeding mechanism, wherein:

[0022] The welding wire reel is wound with welding wire, and the wire feeding mechanism and the welding gun, as well as the wire feeding mechanism and the welding wire reel are connected via a wire feeding tube. The wire feeding mechanism is used to transmit the welding wire to the welding gun.

[0023] Preferably, the wire feeding mechanism includes a fixing frame, a driving wheel, a pressure wheel and a wire guide frame, wherein:

[0024] The driving wheel is connected to a driving device and is rotatably arranged on the fixing frame; the pinch wheel is rotatably connected to the fixing frame and is located above the driving wheel, and the driving wheel can drive the pinch wheel to rotate and pull the welding wire between the two to move;

[0025] The two welding wire guide frames are respectively located on the wire inlet side and the wire outlet side of the driving wheel. A wire feeding cavity is formed in the welding wire guide frame for conveying the welding wire.

[0026] Preferably, at least two first limiting brackets are fixed to the rear end of the vehicle body, and the first limiting brackets are symmetrically arranged on opposite sides of the vehicle body, and a roller is provided at one end of the first limiting bracket away from the axis of the vehicle body;

[0027] And / or, a second limit bracket is provided on the swing arm, and the second limit bracket is symmetrically arranged about the axis of the vehicle body, the end of the second limit bracket facing away from the axis of the vehicle body is connected to an extension arm, and the end of the extension arm close to the welding gun is provided with a roller, and the position of the second limit bracket on the swing arm is adjustable, thereby adjusting the distance between the second limit bracket and the axis of the vehicle body.

[0028] Preferably, a third limiting bracket is provided in the middle of the vehicle body, and a roller is provided at one end of the third limiting bracket facing away from the vehicle body axis; one of the two third limiting brackets arranged opposite to each other is fixed on the vehicle body, and the other is a movable limiting bracket, and the movable limiting bracket is movably connected to the vehicle body through an elastic connection component, and the elastic connection component includes a fixed guide groove, a sliding portion and an elastic member, wherein:

[0029] The fixed guide groove is fixed on the vehicle body, the sliding part is slidably connected to the fixed guide groove, the movable limiting bracket is connected to the sliding part, one end of the elastic member is a fixed end, and the other end thereof is abutted against the sliding part, thereby adjusting the distance between the roller on the movable limiting bracket and the axis of the vehicle body.

[0030] The internal welding device provided by the present invention has the following beneficial effects compared with the prior art: the vehicle body can move inside the U-rib, each vehicle body can move forward and backward independently, and can be repaired by welding at any time; the swing arm is rotatably connected to the vehicle body, the welding gun is located on the swing arm, and the guide wheel at the bottom of the swing arm is tilted compared to the axis of the vehicle body. In this way, when the vehicle body moves along the bottom plate inside the U-rib, the rotating guide wheel can pull the swing arm in a direction away from the axis of the vehicle body, that is, pull the swing arm toward the side plate of the U-rib, so that the wire outlet position of the welding gun is aligned with the weld, preventing the wire outlet position of the welding gun from not contacting the weld, resulting in cold welding, thereby improving the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 It is a schematic diagram of the cross-sectional structure of a structural unit of a U-rib;

[0033] Figure 2 It is a schematic diagram of the overall structure of the internal welding device;

[0034] Figure 3 It is a schematic diagram of the structure of the internal welding device viewed from above;

[0035] Figure 4 It is a schematic diagram of the structure from a top view at the swing arm;

[0036] Figure 5 It is a schematic diagram of the structure from a top view at the swing arm;

[0037] Figure 6 yes Figure 5 Schematic diagram of the structure at AA in the middle;

[0038] Figure 7 It is a structural diagram of the connection between the rotating part and the vehicle body;

[0039] Figure 8 It is a schematic diagram of the coordination structure of the vertical adjustment component, the rotation adjustment component and the welding gun;

[0040] Figure 9 It is a structural diagram of the wire feeding mechanism;

[0041] Figure 10 It is a schematic diagram of the structure of the middle part of the vehicle body from a top view;

[0042] Figure 11 It is a schematic diagram of the driving mechanism of the vehicle body;

[0043] Figure 12 yes Figure 5 Schematic diagram of the structure at BB in the middle.

[0044] In the figure, 101, side plate; 102, bottom plate; 100, vehicle body; 1, swing arm; 2, welding gun; 3, guide wheel; 4, adsorption part; 5, rotating part; 501, limit groove; 51, column; 52, annular cavity; 53, rotating shaft; 61, guide groove; 62, slider; 63, adjusting screw; 64, connecting column; 65, clamp; 651, clamping cavity; 652, opening side; 7, welding wire reel; 8, wire feeding mechanism; 80, fixing frame; 81, driving wheel; 8 2. Pressure wheel; 83. Wire guide frame; 9. First limiting bracket; 10. Roller; 11. Second limiting bracket; 111. Long strip hole; 12. Fixed limiting bracket; 13. Movable limiting bracket; 141. Fixed guide groove; 142. Sliding part; 143. Elastic member; 151. Motor; 152. Wheel; 153. Wheel axle; 154. First bevel gear; 155. Second bevel gear; 16. Base; 17. Elastic part; 18. Extension arm. DETAILED DESCRIPTION

[0045] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be understood that the terms "center," "length," "width," "height," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," and "side" and the like, indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0047] An embodiment of the present invention provides an internal welding device, which can improve the welding quality inside a U-rib.

[0048] The following combination Figure 2-Figure 11 The technical solution provided by the present invention is described in more detail.

[0049] See also Figure 1 As shown, Figure 1This is a schematic diagram of the cross-sectional structure of a U-rib structural unit; during the manufacturing process, the side panels 101 and bottom panel 102 need to be welded. In the prior art, the welding gun is directly fixed to the vehicle body. Because the U-ribs are subject to certain deformation and bending during production, the welding gun is fixed in position when the welding device moves inside the U-rib, making it difficult for the welding gun to fully adhere to the weld seam.

[0050] like Figure 2-Figure 11 As shown, Figure 3 and Figure 4 The arrow in the figure indicates the forward direction of the vehicle body 100 during use. This embodiment provides an internal welding device comprising a vehicle body 100, a swing arm 1, and a welding gun 2. The swing arm 1 is rotatably connected to the vehicle body 100, the welding gun 2 is located on the swing arm 1, and the swing arm 1 extends gradually away from the axis of the vehicle body 100 along the direction of travel of the vehicle body 100. A guide wheel 3 is provided on the swing arm 1, and the guide wheel 3 is tilted relative to the axis of the vehicle body 100. When the vehicle body 100 travels within the U-rib, the guide wheel 3 can pull the swing arm 1 away from the axis of the vehicle body 100, so that the wire outlet position of the welding gun 2 aligns with the weld seam.

[0051] The welding gun 2 is a mature, existing technology. During use, it draws a high-voltage current, which melts the welding wire and forms the weld. Gas shielded welding can also be used in this process, using carbon dioxide to ensure weld strength. These are mature, existing technologies and will not be elaborated upon here.

[0052] In the internal welding device of this embodiment, the car body 100 can move inside the U rib, and each car body 100 can move forward and backward independently and can be repaired by welding at any time; the swing arm 1 is rotatably connected to the car body 100, and the welding gun 2 is not directly fixed on the car body 100, but is located on the swing arm 1. The guide wheel 3 at the bottom of the swing arm 1 is tilted compared to the axis of the car body 100. In this way, when the car body 100 moves along the bottom plate inside the U rib, the rotating guide wheel 3 can pull the swing arm 1 in the direction away from the axis of the car body 100, that is, pull the swing arm 1 toward the side plate of the U rib, and use the side plate of the U rib itself as a guide rail to achieve the purpose of positioning, so that the wire outlet position of the welding gun 2 is aligned with the weld, preventing the wire outlet position of the welding gun 2 from not contacting the weld, resulting in cold welding, thereby improving the welding quality.

[0053] See also Figure 4 As shown, Figure 4The direction of the arrow in the figure is the forward direction of the vehicle body 100 when in use. The guide wheel 3 is tilted compared to the axis of the vehicle body 100, and the guide wheel 3 is tilted compared to the length direction of the swing arm 1. When the vehicle body 100 moves along the set direction inside the U rib, the guide wheel 3 rotates accordingly. Since the swing arm 1 is rotationally connected to the vehicle body 100 and the swing arm 1 is tilted, the guide wheel 3 has a tendency to move away from the axial direction of the vehicle body 100, that is, the guide wheel 3 has a tendency to move toward the side panel. Since the swing arm 1 is in contact with the side panel of the U rib, the above structure can make the wire outlet position of the welding gun 2 fit the weld.

[0054] See also Figure 4 As shown, the guide wheel 3 of this embodiment can be an unpowered wheel body, which rotates with the trolley during the forward movement of the trolley, or it can be connected to a driving device such as a motor to drive the guide wheel 3 to rotate.

[0055] Alternatively, an elastic portion (not shown) is connected between the swing arm 1 and the vehicle body 100. The elastic portion may be a spring. When in a contracted state, the elastic portion pushes the swing arm 1 away from the axis of the vehicle body 100, causing the swing arm 1 to tend to move away from the axis of the vehicle body 100. The structure of the elastic portion and the guide wheel 3 allows the welding gun to more closely fit the weld seam.

[0056] For details, see Figure 11 As shown, the vehicle body 100 of this embodiment is provided with wheels 152, wheel shafts 153 and a driving mechanism, and the driving mechanism includes a motor 151. A first bevel gear 154 is fixed to the output shaft of the motor 151, and a second bevel gear 155 is fixed to the wheel shaft 153. The first bevel gear 154 and the second bevel gear 155 are engaged with each other. When the motor 151 rotates, the wheel 152 is driven to rotate, thereby realizing independent movement of the vehicle body 100.

[0057] As an alternative embodiment, see Figure 2-Figure 5 As shown, there are at least two swing arms 1 , all of which are symmetrically distributed on both sides of the vehicle body 100 , and the guide wheels 3 are symmetrically arranged about the axis of the vehicle body 100 .

[0058] Since the U rib includes two side plates 101, as shown in FIG. Figure 1 As shown, when the vehicle body 100 moves along the bottom plate 102 within the U-rib, the welding guns 2 on the two symmetrically arranged swing arms 1 can weld the welds on both sides simultaneously, eliminating the need to weld back and forth between the two welds, thereby improving welding efficiency. Furthermore, the guide wheels 3 located on both swing arms 1 ensure that the wire outlet positions of both welding guns 2 are aligned with the weld seam.

[0059] As an alternative embodiment, see Figure 3 and Figure 4As shown, an adsorption portion 4 is provided at the bottom of the swing arm 1, and the adsorption portion 4 is used to make the swing arm 1 fit with the bottom plate of the U rib when the vehicle body 100 is moving.

[0060] The above-mentioned adsorption part 4 can be a magnet. When the vehicle body 100 is moving, there is a certain adsorption force between the magnet and the bottom plate, which can prevent the swing arm 1 from tilting upward during the movement of the vehicle body 100, causing the wire outlet position of the welding gun 2 to be higher than the weld seam.

[0061] Since the U-ribs have a certain degree of bending deformation during the production process, the bottom plate is not necessarily flat and may have a certain degree of bending deformation.

[0062] In order to further ensure that the wire outlet position of the welding gun 2 is aligned with the weld, in this embodiment, the position of the swing arm 1 in the vertical and horizontal directions is adjustable, thereby adjusting the position of the welding gun 2 in the vertical and horizontal directions.

[0063] Specific: See Figure 5-Figure 7 As shown, a rotating member 5 is provided on the vehicle body 100. A limiting ring is fixed to the side of the rear end of the vehicle body 100. The limiting ring is formed with an annular cavity 52, which is arranged vertically. The rotating member 5 is fixedly connected to a column 51, which extends into the annular cavity 52 and can rotate along the annular cavity 52 in a vertical plane. A limiting groove 501 is provided on the rotating member 5. The end of the swing arm 1 facing away from the welding gun 2 is located in the limiting groove 501 and is rotatably connected to the limiting groove 501. The limiting groove 501 is used to limit the rotation angle of the swing arm 1 in the horizontal plane. Figure 5 and Figure 6 The swing arm 1 is rotatably connected to the limiting slot 501 through a rotating shaft 53, and the rotating shaft 53 is vertically arranged.

[0064] When the vehicle body 100 moves along the bottom plate with a certain curvature inside the U rib, since the rotating member 5 is not fixed to the vehicle body 100 but can rotate in the vertical plane, when the rotating member 5 rotates in the vertical plane, the column 51 rotates along the annular cavity 52 of the limiting ring, as shown in FIG. Figure 6 and Figure 7 As shown, the swing arm 1 rotates along the axis of the limiting ring, so that the vertical position of the welding gun 2 can be automatically adjusted in real time, so that the wire outlet position of the welding gun 2 can fit the weld.

[0065] Because the guide wheels 3 can pull the swing arm 1 toward the side panels, that is, when the side panels are bent and deformed, the guide wheels 3 pull the swing arm 1, causing the swing arm 1 to rotate within the horizontal plane. The sidewalls of the limiting groove 501 can limit the rotation angle of the swing arm 1, preventing the swing arm 1 from rotating too much and becoming difficult to position within the U-rib. The above structure, combined with the guide wheels 3, can rotate the swing arm 1 within the vertical plane and within a certain range in the horizontal plane, facilitating the adjustment of the position of the swing arm 1 and the welding gun 2.

[0066] As an alternative embodiment, see Figure 5 and Figure 12 As shown, a seat 16 and an elastic portion 17 are provided on the vehicle body, wherein: the seat 16 is fixed on the vehicle body 100, one end of the elastic portion 17 is fixed in the seat 16, and the other end rests on the upper surface of the rotating member 5, for pushing the rotating member 5 to fit with the bottom plate of the U rib.

[0067] The elastic portion 17 may be a return spring, the lower end of which rests against the upper surface of the rotating member 5. When the vehicle body moves within the U-rib, even if the bottom plate is deformed to a certain extent, the deformation of the return spring (elastic portion 17) enables the rotating member 5 and the vehicle body 100 to always move in contact with the bottom plate, thereby ensuring that the position of the welding gun 2 always fits the weld.

[0068] In order to further ensure that the wire outlet position of the welding gun 2 is aligned with the weld seam, the position of the welding gun 2 on the swing arm 1 is adjustable in this embodiment.

[0069] Specific: See Figure 1 and Figure 8 As shown, a vertical adjustment component is provided on the swing arm 1, and the vertical adjustment component includes a guide groove 61, a slider 62 and an adjusting screw 63, wherein: the guide groove 61 is fixed on the swing arm 1 and is vertically arranged, the slider 62 is slidably connected to the guide groove 61, the welding gun 2 is connected to the slider 62, the adjusting screw 63 is vertically arranged and threadedly connected to the slider 62, and rotating the adjusting screw 63 can drive the slider 62 to move back and forth in the vertical direction.

[0070] When the adjustment screw 63 is rotated forward, the slider 62 moves vertically upward along the guide slot 61, thereby driving the welding gun 2 vertically upward. When the adjustment screw 63 is rotated backward, the slider 62 moves vertically downward along the guide slot 61, thereby driving the welding gun 2 vertically downward. The terms "forward" and "reverse" are relative: when one is clockwise, the other is counterclockwise. This structure adjusts the vertical position of the welding gun 2 on the swing arm 1, ensuring that the wire exit position of the welding gun 2 aligns with the weld seam.

[0071] As an alternative embodiment, see Figure 8 A rotation adjustment assembly is provided on the swing arm 1, and the rotation adjustment assembly includes a connecting column 64 and a clamp 65, wherein: the connecting column 64 is fixed on the slider 62 and is arranged horizontally, the clamp 65 is connected to the welding gun 2, and a clamping cavity 651 is formed on the clamp 65, the connecting column 64 extends into the clamping cavity 651 and is connected to the clamp 65; the clamp 65 has an open side 652, and the open side 652 is connected to the clamping cavity 651. Adjusting the size of the opening side 652 can adjust the size of the clamping cavity 651, so that the clamp 65 drives the welding gun 2 to rotate in a vertical plane with the connecting column 64 as the axis.

[0072] See also Figure 8 A bolt and nut assembly (not shown) can be screwed onto the opening side 652. The bolt and nut assembly can be used to adjust the gap size of the opening side 652, thereby adjusting the size of the clamping cavity 651. When the clamping cavity 651 is increased, the clamp 65 can be rotated, thereby driving the welding gun 2 to rotate around the connecting column 64. After the position of the welding gun 2 is adjusted, the clamp 65 can be re-secured to the connecting column 64 using the bolt and nut assembly. The above structure can adjust the vertical position of the welding gun 2 on the swing arm 1.

[0073] The vertical adjustment assembly of this embodiment can adjust the vertical position of the welding gun 2 within a larger range, and the rotation adjustment assembly can adjust the vertical position of the welding gun 2 more finely within a smaller range, thereby ensuring that the wire outlet position of the welding gun 2 is aligned with the weld.

[0074] In the prior art, the wire feeding device is located outside the U-rib and feeds the wire to the welding device running inside the U-rib. The welding wire extends a long distance, resulting in a waste of welding wire. In addition, the welding device pulls the welding wire, which easily leads to uneven wire feeding, easy tangling and wire breakage.

[0075] For the above issues, see Figure 1 and Figure 9 As shown, a wire reel 7 and a wire feeding mechanism 8 are provided on the vehicle body 100, wherein: welding wire is wound on the wire reel 7, and the wire feeding mechanism 8 and the welding gun 2, as well as the wire feeding mechanism 8 and the wire reel 7 are connected through a wire feeding tube, and the wire feeding mechanism 8 is used to transmit the welding wire to the welding gun 2.

[0076] See also Figure 1 and Figure 9 As shown, the figure omits the wire feeding tubes between the wire feeding mechanism 8 and the welding gun 2, and between the wire feeding mechanism 8 and the welding wire reel 7. In the internal welding device of this embodiment, the welding wire reel 7 and the wire feeding mechanism 8 are located on the vehicle body 100. Compared with the method of pulling the welding wire outside the U-rib into the U-rib, the above-mentioned structure of this embodiment, when in use, the welding wire is wound around the welding wire reel 7 and fed to the wire feeding mechanism 8 and the welding gun 2 on the vehicle body 100 through the wire feeding tube. This can reduce the waste and tangling of welding wire, ensure the uniformity of wire feeding, prevent wire breakage, and improve welding performance.

[0077] This embodiment provides a specific implementation of the wire feeding mechanism 8, see Figure 9The wire feeding mechanism 8 includes a fixed frame 80, a driving wheel 81, a pressure wheel 82 and a welding wire guide frame 83, wherein: the driving wheel 81 is connected to a driving device and is rotatably arranged on the fixed frame 80; the pressure wheel 82 is rotatably connected to the fixed frame 80 and is located above the driving wheel 81. The driving wheel 81 can drive the pressure wheel 82 to rotate and pull the welding wire between the two to move; the two welding wire guide frames 83 are respectively located on the wire input side and the wire output side of the driving wheel 81. A wire feeding cavity (not shown in the figure) is formed in the welding wire guide frame 83 for conveying welding wire.

[0078] See also Figure 1 and Figure 9 As shown, the above-mentioned welding wire guide frame 83 can raise the welding wire to between the driving wheel 81 and the pressure wheel 82, and play the role of positioning and transferring the welding wire.

[0079] The above-mentioned driving device can be a motor, and the driving wheel 81 is connected to the output end of the driving device. The driving device drives the driving wheel 81 to rotate. When the driving wheel 81 rotates, the driving wheel 81 cooperates with the clamping wheel 82, and uses friction to pull the welding wire between the two, thereby realizing the transmission of the welding wire.

[0080] Specifically, under the action of the above-mentioned structure, the welding wire wound on the wire reel 7 is guided through the wire feeding tube in sequence to the wire guide frame 83 close to the side of the wire reel 7, between the driving wheel 81 and the clamping wheel 82, the wire guide frame 83 away from the side of the wire reel 7, and the inside of the welding gun 2.

[0081] When the vehicle body 100 moves in the U-rib, in order to facilitate limiting the position of the vehicle body 100, as an optional embodiment, see Figure 1 At least two first position-limiting brackets 9 are fixed to the rear end of the vehicle body 100. These first position-limiting brackets 9 are symmetrically arranged on opposite sides of the vehicle body 100. Rollers 10 are installed on the ends of the first position-limiting brackets 9 facing away from the axis of the vehicle body 100. These rollers 10 are in rolling connection with the side plates 101 of the U-rib, facilitating smooth movement of the vehicle body 100. Furthermore, the two symmetrical first position-limiting brackets 9 can restrain the vehicle body 100 in the middle of the U-rib, ensuring that the axis of the vehicle body 100 and the axis of the U-rib coincide as much as possible.

[0082] and / or, see Figure 1 and Figure 5The swing arm 1 is provided with a second limiting bracket 11, which is symmetrically arranged about the axis of the vehicle body 100. An extension arm 18 is connected to the end of the second limiting bracket 11 facing away from the axis of the vehicle body 100. A roller is provided on the end of the extension arm 18 closer to the welding gun 2. The roller is also in rolling connection with the side plate of the U-rib, facilitating smooth movement of the vehicle body 100. The position of the second limiting bracket 11 on the swing arm 1 is adjustable, thereby adjusting the distance between the second limiting bracket 11 and the axis of the vehicle body 100. The extension arm 18 and the roller thereon serve to limit the position of the welding gun 2. Due to the configuration of the extension arm 18, the roller on the second limiting bracket 11 can be brought closer to the welding gun 2. Even if there is a certain degree of bending deformation of the side plate, the extension arm 18 and the roller thereon can limit the position of the welding gun 2, so that the welding position of the welding gun 2 is more closely aligned with the weld seam.

[0083] By adjusting the distance between the second limiting bracket 11 and the axis of the vehicle body 100, the position of the swing arm 1 in the U rib can be limited. Figure 5 The second limiting bracket 11 is provided with an elongated hole 111, which extends along the length direction of the second limiting bracket 11. A locking member, such as a bolt, passes through the elongated hole 111 to fix the second limiting bracket 11 and the swing arm 1. By adjusting the fixed position of the locking member in the elongated hole, the distance between the second limiting bracket 11 and the axis of the vehicle body 100 can be limited, thereby limiting the opening angle of the swing arm 1.

[0084] Since the U-rib has a certain bending deformation during the production process, the side plates may also have a certain bending deformation, and the distance between the two side plates may not be a constant value, which may easily cause the welding gun 2 to deviate from the weld.

[0085] For the above issues, see Figure 1 and Figure 10 As shown, a third limiting bracket is provided in the middle of the vehicle body 100. A roller is provided at one end of the third limiting bracket, facing away from the axis of the vehicle body 100. The roller is also in rolling connection with the side plate of the U-rib, facilitating smooth movement of the vehicle body 100. Of the two third limiting brackets arranged opposite each other, one is fixed to the vehicle body 100 and is a fixed limiting bracket 12, while the other is a movable limiting bracket 13. The movable limiting bracket 13 is movably connected to the vehicle body 100 via an elastic connection assembly. The elastic connection assembly includes a fixed guide groove 141, a sliding portion 142, and an elastic member 143. The fixed guide groove 141 is fixed to the vehicle body 100, the sliding portion 142 is slidably connected to the fixed guide groove 141, and the movable limiting bracket 13 is connected to the sliding portion 142. The elastic member 143 has one fixed end and the other end abuts against the sliding portion 142, thereby adjusting the distance between the roller on the movable limiting bracket 13 and the axis of the vehicle body 100. The elastic member 143 may be a spring.

[0086] See also Figure 10 As shown, when the side panel is bent and deformed, causing the distance between the two side panels to decrease, the side panel abuts against the roller on the movable limiting bracket 13, and the movable limiting bracket 13 and the sliding part 142 are pushed toward the direction close to the axis of the vehicle body 100. At this time, the elastic member 143 contracts and the axis position of the vehicle body 100 moves; when the side panel is bent and deformed, causing the distance between the two side panels to increase, the elastic restoring force of the elastic member 143 pushes the sliding part 142 and the movable limiting bracket 13 toward the direction close to the corresponding side panel, so that the roller on the movable limiting bracket 13 contacts the corresponding side panel, and the axis position of the vehicle body 100 moves; thereby ensuring that the welding gun 2 on the vehicle body 100 is always in contact with the weld.

[0087] The above structure of this embodiment uses the side plates of the U rib itself as guide rails to achieve the purpose of positioning the car body 100 and the swing arm 1, so that the wire outlet position of the welding gun 2 is aligned with the weld and the weld spacing, thereby improving the quality of the weld.

[0088] In the description of this specification, specific features, structures or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0089] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0090] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An internal welding device, characterized in that: It includes a vehicle body, a swing arm and a welding gun, including: The swing arm is rotatably connected to the vehicle body, the welding gun is located on the swing arm, and the swing arm gradually extends away from the vehicle body axis along the moving direction of the vehicle body; The swing arm is provided with a guide wheel, which is arranged obliquely relative to the axis of the vehicle body. When the vehicle body moves in the U-rib, the guide wheel can pull the swing arm in a direction away from the axis of the vehicle body, so that the wire outlet position of the welding gun is aligned with the weld seam; The bottom of the swing arm is provided with an adsorption portion, which is used to make the swing arm fit with the bottom plate of the U rib when the vehicle body is moving; The vehicle body is provided with a rotating member, a limiting ring is fixed to the side of the rear end of the vehicle body, an annular cavity is formed on the limiting ring, and the annular cavity is vertically arranged; the rotating member is fixedly connected to a column, and the column extends into the annular cavity and can rotate in a vertical plane along the annular cavity; A limiting groove is provided on the rotating member, and the end of the swing arm facing away from the welding gun is located in the limiting groove and is rotatably connected to the limiting groove. The limiting groove is used to limit the rotation angle of the swing arm on the horizontal plane.

2. The internal welding device according to claim 1, characterized in that The vehicle body is provided with a seat and an elastic part, wherein: the seat is fixed on the vehicle body, one end of the elastic part is fixed in the seat, and the other end abuts against the upper surface of the rotating part to push the rotating part to fit with the bottom plate of the U rib.

3. The internal welding device according to claim 1, characterized in that The swing arm is provided with a vertical adjustment assembly, which includes a guide groove, a slider and an adjustment screw, wherein: The guide groove is fixed on the swing arm and is vertically arranged. The slider is slidably connected to the guide groove. The welding gun is connected to the slider. The adjusting screw is vertically arranged and threadedly connected to the slider. Rotating the adjusting screw can drive the slider to move back and forth in the vertical direction.

4. The internal welding device according to claim 3, characterized in that: The swing arm is provided with a rotation adjustment assembly, which includes a connecting column and a clamp, wherein: The connecting post is fixed on the slider and arranged horizontally. The clamp is connected to the welding gun. A clamping cavity is formed on the clamp. The connecting post extends into the clamping cavity and is connected to the clamp. The clamp has an open side, which is connected to the clamping cavity. Adjusting the size of the open side can adjust the size of the clamping cavity, so that the clamp drives the welding gun to rotate in a vertical plane with the connecting column as the axis.

5. The internal welding device according to claim 1, characterized in that: The vehicle body is provided with a wire reel and a wire feeding mechanism, wherein: The welding wire reel is wound with welding wire, and the wire feeding mechanism and the welding gun, as well as the wire feeding mechanism and the welding wire reel are connected via a wire feeding tube. The wire feeding mechanism is used to transmit the welding wire to the welding gun.

6. The internal welding device according to claim 5, characterized in that: The wire feeding mechanism includes a fixed frame, a driving wheel, a pressure wheel and a wire guide frame, wherein: The driving wheel is connected to a driving device and is rotatably arranged on the fixing frame; the pinch wheel is rotatably connected to the fixing frame and is located above the driving wheel, and the driving wheel can drive the pinch wheel to rotate and pull the welding wire between the two to move; The two welding wire guide frames are respectively located on the wire inlet side and the wire outlet side of the driving wheel. A wire feeding cavity is formed in the welding wire guide frame for conveying the welding wire.

7. The internal welding device according to claim 1, characterized in that At least two first limiting brackets are fixed to the rear end of the vehicle body, and the first limiting brackets are symmetrically arranged on opposite sides of the vehicle body, and a roller is arranged at one end of the first limiting bracket away from the axis of the vehicle body; And / or, a second limit bracket is provided on the swing arm, and the second limit bracket is symmetrically arranged about the axis of the vehicle body, the end of the second limit bracket facing away from the axis of the vehicle body is connected to an extension arm, and the end of the extension arm close to the welding gun is provided with a roller, and the position of the second limit bracket on the swing arm is adjustable, thereby adjusting the distance between the second limit bracket and the axis of the vehicle body.

8. The internal welding device according to claim 1 or 7, characterized in that: A third limiting bracket is provided in the middle of the vehicle body, and a roller is provided at one end of the third limiting bracket facing away from the vehicle body axis; one of the two third limiting brackets arranged opposite to each other is fixed on the vehicle body, and the other is a movable limiting bracket, and the movable limiting bracket is movably connected to the vehicle body through an elastic connection component, and the elastic connection component includes a fixed guide groove, a sliding portion and an elastic member, wherein: The fixed guide groove is fixed on the vehicle body, the sliding part is slidably connected to the fixed guide groove, the movable limiting bracket is connected to the sliding part, one end of the elastic member is a fixed end, and the other end thereof is abutted against the sliding part, thereby adjusting the distance between the roller on the movable limiting bracket and the axis of the vehicle body.

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