Wire feeding mechanism and U-rib internal welding wire feeding trolley

Abstract

The utility model relates to the technical field of U-rib welding, in particular to a wire feeding mechanism and a U-rib internal welding wire feeding trolley, the wire feeding mechanism is installed on a U-rib internal welding machine and used for conveying welding wires wound on a wire reel to a welding gun, and the wire feeding mechanism comprises a wire feeding driving wheel connected with an output shaft of a driving motor; the wire feeding pressing wheel freely rotates around a central shaft of the wire feeding pressing wheel, and the wire feeding pressing wheel tightly presses the welding wire on the wire feeding driving wheel, so that the welding wire is pulled out from the welding wire reel by utilizing friction force and is fed to the welding gun; the point where the welding wire leaves from the welding wire reel is the discharging point of the welding wire reel, and the welding wire enters the position between the wire feeding pressing wheel and the wire feeding driving wheel from the direction in which the included angle between the welding wire and the tangent line of the discharging point is smaller than 30 degrees. The wire feeding mechanism provided by the utility model is smoother in wire feeding.

Description

Technical Field

[0001] The utility model relates to the technical field of U-rib welding, in particular to a wire feeding mechanism and a U-rib internal welding wire feeding vehicle. Background Art

[0002] Steel box girders are a crucial component of bridge load-bearing structures. They are typically constructed from orthotropic steel decks, primarily providing support and preventing deformation. They typically consist of a top plate and a bottom plate, typically welded from U-ribs and steel plates.

[0003] At present, the U-ribs of bridges can be welded on both sides using internal welding technology through internal welding vehicles, which greatly improves the fatigue life of the welded joints between the U-ribs and the steel plates. Utility Model Content

[0004] The purpose of the utility model is to improve the smoothness of conveying welding wire when welding the inner corner of U ribs, and provides a wire feeding mechanism and a U rib inner welding wire feeding vehicle.

[0005] The utility model is realized through the following technical solutions.

[0006] The wire feeding mechanism is installed on the U-rib internal welding machine and is used to feed the welding wire wound on the wire reel to the welding gun. It includes:

[0007] A wire feeding drive wheel connected to the output shaft of the drive motor;

[0008] A wire feeding pressure wheel, which rotates freely around its central axis and presses the welding wire against the wire feeding drive wheel, thereby utilizing friction to pull the welding wire from the wire reel and feed it to the welding gun;

[0009] The point where the welding wire leaves the wire reel is the discharge point of the wire reel, and the welding wire enters between the wire feeding pressure wheel and the wire feeding drive wheel from a direction with an angle less than 30 degrees with the tangent at the discharge point.

[0010] In one embodiment, the wire feeding mechanism comprises: two pairs of the wire feeding pressure wheels and the wire feeding drive wheels; and

[0011] The wire inlet pipe and the wire outlet pipe are respectively located in front and behind the two pairs of wire feeding pressure wheels and the wire feeding drive wheel;

[0012] The wire feeding tube is located between the two pairs of wire feeding pressure wheels and the wire feeding driving wheel.

[0013] In one embodiment, the wire feeding mechanism further comprises:

[0014] A speed reducer comprising a housing and a reduction gear set located within the housing;

[0015] The machine shell comprises a base and a cover plate, the base is provided with a motor shaft hole, and the cover plate is provided with two output shaft holes;

[0016] The output shaft of the driving motor enters the machine shell from the motor shaft hole and is connected with the input shaft of the speed reduction gear set, the input shaft of the speed reduction gear set is connected with the two output shafts of the speed reduction gear set through multiple gears, the rotation speeds of the two output shafts of the speed reduction gear set are the same, and the two output shafts of the speed reduction gear set are respectively fixed with the wire feeding driving wheels after penetrating out of the machine shell from the two output shaft holes; and the wire feeding pressure roller is installed outside the machine shell.

[0017] In an embodiment, the machine shell of the speed reducer is installed on a cushion block, and the installation surface of the cushion block is inclined to the bottom surface of the vehicle body of the U-rib internal welding machine.

[0018] In an embodiment, the cushion block is made of insulating material.

[0019] In an embodiment, the angle of the installation surface of the cushion block changes with the position of the discharge point.

[0020] The application also provides a U-rib internal welding wire feeding vehicle, comprising:

[0021] A vehicle body, which travels in the U-rib along the length direction of the U-rib;

[0022] The wire feeding mechanism described above.

[0023] In an embodiment, the U-rib internal welding wire feeding vehicle further comprises:

[0024] An upper pressing wheel, which is pressed on the top plate when the vehicle body travels in the U-rib, and the upper pressing wheel is connected to the output end of a pneumatic cylinder or a hydraulic cylinder.

[0025] In an embodiment, the U-rib internal welding wire feeding vehicle further comprises:

[0026] A welding wire reel, which is freely rotatable around the central shaft thereof, and the welding wire is wound on the welding wire reel;

[0027] In an embodiment, the central shafts of the two welding wire reels are coaxial.

[0028] The wire feeding pressure rollers of the two wire feeding mechanisms are coaxial, and the wire feeding driving wheels are coaxial.

[0029] In the technical scheme of the utility model, the welding wire enters between the wire feeding pressure roller and the wire feeding driving wheel from a direction with an included angle less than 30 degrees with the tangent line at the discharge point, the change of the welding wire output angle of the welding wire reel and the wire feeding angle of the wire feeding mechanism is small, and the wire feeding is more smooth.

[0030] For further clarification, various aspects and advantages of the embodiments disclosed in the present invention will become apparent in the following description or can be understood through the practice of the embodiments disclosed in the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention.

[0032] Figure 1 A schematic diagram of the structure of a wire feeding mechanism provided in Example 1 installed in a U-rib internal welding wire feeding vehicle and a schematic diagram of the structure of a U-rib internal welding wire feeding vehicle provided in Example 2;

[0033] Figure 2 Schematic diagram of the structure of the wire feeding mechanism in Example 1;

[0034] Figure 3 This is a structural schematic diagram of the wire feeding mechanism in Example 1 from another perspective;

[0035] Figure 4 Schematic diagram of the internal structure of the reducer of the wire feeding mechanism in Example 1;

[0036] Figure 5 Schematic diagram of the structure of the welding wire reel in Example 2;

[0037] Figure 6 This is a schematic cross-sectional view of the welding wire reel in Example 2. DETAILED DESCRIPTION

[0038] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0039] Example 1

[0040] Reference Figures 1 to 4 This embodiment provides a wire feeding mechanism, which is installed on the U-rib internal welding machine 1 and is used to feed the welding wire wound on the wire reel 22 to the welding gun (not shown in the figure).

[0041] The wire feeding mechanism 2 provided in this embodiment includes:

[0042] The wire feeding drive wheel 9 is connected to the output shaft of the drive motor 13;

[0043] A wire feeding pressure wheel 8, which rotates freely around its central axis and presses the welding wire against the wire feeding drive wheel 9, thereby utilizing friction to pull the welding wire from the wire reel 22 and feed it to the welding gun;

[0044] The point where the welding wire leaves the wire reel 22 is the discharge point of the wire reel 22, and the welding wire enters between the wire feeding pressure wheel 8 and the wire feeding drive wheel 9 from a direction with an angle less than 30 degrees with the tangent at the discharge point.

[0045] In this embodiment, the welding wire enters between the wire feeding pressure wheel 8 and the wire feeding drive wheel 9 from a direction with an angle less than 30 degrees with the tangent at the discharge point. The change in the wire output angle of the wire reel 22 and the wire feeding angle of the wire feeding mechanism 2 becomes smaller, and the wire feeding becomes smoother.

[0046] In this embodiment, the welding wire is fed in a direction with an angle of less than 30 degrees with the tangent line at the discharge point, and the vehicle body length is as short as possible to ensure smooth wire feeding.

[0047] In this embodiment, the wire feeding mechanism 2 further includes a bottom pad 7, the upper surface of which is inclined relative to the bottom surface of the U-rib internal welder 1, so that the angle between the wire feeding path of the wire feeding mechanism and the tangent direction of the welding wire at the discharge point is less than 30 degrees. The pad 7 provided in this embodiment changes the angle of the wire feeding path of the wire feeding mechanism, which is easy to implement and adjust.

[0048] In this embodiment, the material of the pad 7 is insulating material.

[0049] As the welding wire is unwound from the wire reel 22, the position of the discharge point changes, and the angle of the mounting surface of the pad 7 follows the position of the discharge point, further ensuring smooth wire feeding. A photoelectric sensor can be installed on the inner wall of the wire reel to monitor the thickness of the welding wire wound thereon. A wedge-shaped slider is installed below the higher end of the upper surface of the pad 7. The slider is connected to the output end of a linear displacement output device (such as a hydraulic cylinder) and transmits the output information of the photoelectric sensor to the controller of the linear displacement output device. Changing the position of the slider thereby changes the angle of the upper surface of the pad 7.

[0050] The wire feeding mechanism 2 comprises two pairs of wire feeding pressure wheels 8 and wire feeding driving wheels 9; and

[0051] The wire inlet pipe 10 and the wire outlet pipe 11 are respectively located in front of and behind the two pairs of wire feeding pressure wheels 8 and the wire feeding drive wheel 9;

[0052] The wire feeding tube 12 is located between the two pairs of wire feeding pressure wheels 8 and the wire feeding driving wheel 9.

[0053] The wire inlet pipe 10, the wire outlet pipe 11, and the wire feed pipe 12 are used to provide a guide for the welding wire. In this embodiment, the outer walls of the end of the wire inlet pipe 10 close to the wire feed pressure wheel 8 and the wire feed drive wheel 9 and the end of the wire outlet pipe 11 close to the wire feed pressure wheel 8 and the wire feed drive wheel 9 are configured to be tapered, thereby being closer to the wire feed pressure wheel 8 and the wire feed drive wheel 9, providing a longer distance for guiding the welding wire without increasing the length of the wire feeding mechanism 2.

[0054] When welding the inner angles of the U-ribs of the steel box girders of an in-service bridge, in addition to providing the welding gun with an overhead welding posture, in order to minimize the impact on the stiffness and strength of the in-service bridge, when opening an operating hole on the U-rib for the internal welding vehicle to enter its interior, the shorter the operating hole, the better. Correspondingly, the shorter the length of the internal welding vehicle, the better. Therefore, in this embodiment, the outer walls of the wire inlet tube 10 close to the wire feed pressure wheel 8 and the wire feed drive wheel 9 and the wire outlet tube 11 close to the wire feed pressure wheel 8 and the wire feed drive wheel 9 are configured to be tapered, providing a longer distance for guiding the welding wire without increasing the length of the wire feeding mechanism 2, thereby reducing the length of the internal welding vehicle. Therefore, the wire feeding mechanism 2 provided in this embodiment is more suitable for use on a welding vehicle for welding the inner angles of the U-ribs of the steel box girders of an in-service bridge.

[0055] Furthermore, the wire feeding mechanism 2 further comprises:

[0056] A speed reducer, comprising a housing 14 and a reduction gear set located within the housing 14;

[0057] The housing 14 includes a base and a cover plate, the base is provided with a motor shaft hole, and the cover plate is provided with two output shaft holes;

[0058] The output shaft of the driving motor 13 enters the casing 14 from the motor shaft hole and is connected to the input shaft of the reduction gear set. The input shaft of the reduction gear set is connected to the two output shafts of the reduction gear set through a multi-stage gear. The two output shafts of the reduction gear set have the same rotational speed; the output shafts of the two reduction gear sets pass through the two output shaft holes of the casing respectively and then are fixed with one wire feeding drive wheel 9; the wire feeding pressure wheel is installed on the outside of the casing 14.

[0059] Specifically, the output gear 15 is fixed on the output shaft of the driving motor 13, and the output gear 15 is meshed with the primary driven gear 16, and the secondary driving gear ( Figure 4 The secondary driving gear is located on the side of the primary driven gear 16 close to the paper surface) and is coaxially fixed to the first transmission shaft 17 with the primary driven gear 16. The secondary driven gear 21 is meshed with the secondary driving gear. The tertiary driving gear ( Figure 4The third primary gear is coaxially fixed on the second transmission shaft 18 at the side away from the paper of the second driven gear 21, and the two third driven gears 20 are engaged with the third primary gear. The reducer output shaft 19 of each third driven gear 20 is fixed with a wire feeding drive wheel 9 after passing through the output shaft hole of the cover plate.

[0060] In the embodiment, the output gear and the gears are arranged in up-down staggered manner, which greatly reduces the thickness of the speed reducer. Furthermore, the speed reducer housing and the base of the wire feeding mechanism share a part (the cover plate), which reduces the thickness of the wire feeding mechanism. The two wire feeding mechanisms (two connection seams between the U-rib and the steel plate) are arranged side by side, thereby reducing the length of the internal welding vehicle. The internal welding vehicle with smaller length is more suitable for the welding scene of the internal corner of the U-rib of the steel box girder of the bridge in service, and the details are not repeated.

[0061] In order to minimize the curvature of the welding wire when stored on the welding wire disc 22, the diameter of the welding wire disc 22 is set as large as possible, and the diameter of the welding wire disc 22 is close to the height of the internal cavity of the vehicle body 1 or the height of the U-rib. In this design idea, the speed reducer housing 14 is installed on the pad 7, and the installation surface of the pad 7 on which the speed reducer housing 14 is installed is inclined to the bottom surface of the vehicle body 3, so that the welding wire enters the wire feeding path of the wire feeding mechanism from a direction with an included angle of less than 30 degrees with the tangent at the discharge point. The pad provided in the embodiment changes the angle of the wire feeding mechanism as a whole, which is easy to implement and adjust.

[0062] In the embodiment, the pad 7 is made of insulating material, which meets the welding standard.

[0063] The wire feeding mechanism provided in the embodiment can also be used in other internal cavity welding of narrow spaces similar to the U-rib.

[0064] Embodiment 2

[0065] Reference Figures 1 to 6 The embodiment provides a U-rib internal welding wire feeding vehicle 1, which comprises:

[0066] A vehicle body 3 is arranged to travel along the length direction of the U-rib in the U-rib.

[0067] A welding wire disc 22 is arranged to rotate freely around the central axis, and the welding wire is wound on the welding wire disc 22.

[0068] and the wire feeding mechanism 2 provided in embodiment 2.

[0069] In this embodiment, the welding wire enters between the wire feeding pressure wheel and the wire feeding drive wheel from a direction with an angle less than 30 degrees with the tangent at the discharge point. The change in the wire output angle of the wire reel 22 and the wire feeding angle of the wire feeding mechanism 2 becomes smaller, and the wire feeding becomes smoother.

[0070] In the working scenario of welding the inner corners of the U-ribs of the steel box girder of the in-service bridge, the working posture of the welding gun is obliquely upward relative to the vehicle body 3; the discharge point of the welding wire on the welding wire reel 22 is located below the welding wire reel 22, and the wire feeding mechanism 2 is installed upward on the pad 7, the welding wire path tends to be a straight line, and the wire feeding is smooth.

[0071] In this embodiment, the U-rib internal welding wire feeding vehicle further comprises:

[0072] The upper top wheel 5 is pressed tightly against the top plate when the car body 3 moves in the U-rib. The upper top wheel 5 is connected to the output end of the cylinder 6. The reaction force exerted on the upper top wheel 5 increases the pressure of the car body 3 on the U-rib bottom plate, thereby increasing the friction and making the operation of the inner welding car more stable.

[0073] In order to achieve the movement of the vehicle body 3, a front driving wheel 4 and a rear driven wheel are installed at the bottom of the vehicle body 3. The upper top wheel 5 is located directly above the front driving wheel 4 of the vehicle body 3, and the torque is smaller, which makes it easy to achieve a compacting effect.

[0074] In this embodiment, the central axes of the two welding wire reels 22 coincide with each other;

[0075] The wire feeding pressure wheels 8 of the two wire feeding mechanisms 2 are coaxial, and the wire feeding driving wheels 9 are coaxial.

[0076] The two welding guns weld simultaneously, and a single trip of the internal welding vehicle completes the welding of two seams between the U-rib and the steel plate. Compared to the technical solution in which two wire reels 22 are arranged in a staggered arrangement, the side-by-side arrangement of the wire reels 22 and the wire feeder 2 can reduce the length of the internal welding vehicle. The shorter internal welding vehicle is more suitable for welding the inner corners of U-ribs on steel box girders of in-service bridges, and will not be described in detail.

[0077] In this embodiment, in order to achieve the coincidence of the central axes of the two welding wire reels 22, refer to Figure 5 and Figure 6 The two dampers 24 are locked and fixed on the wire reel bracket 23 with screws 25 and nuts 26. The wire feeding reel 22 is installed on the damper 24. There are through holes on the wire reel bracket 23 for assembling it on the bottom plate of the vehicle body 3 through screws.

[0078] The U-rib internal welding wire feeding vehicle provided in this embodiment can also be used for inner cavity welding in other narrow spaces similar to U-ribs.

[0079] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0080] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0081] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means 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.

[0082] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. The wire feeding mechanism is installed on the U-rib internal welding machine and is used to feed the welding wire wound on the wire reel to the welding gun. It is characterized by: Include: A wire feeding drive wheel connected to the output shaft of the drive motor; A wire feeding pressure wheel, which rotates freely around its central axis and presses the welding wire against the wire feeding drive wheel, thereby utilizing friction to pull the welding wire from the wire reel and feed it to the welding gun; The point where the welding wire leaves the wire reel is the discharge point of the wire reel, and the welding wire enters between the wire feeding pressure wheel and the wire feeding drive wheel from a direction with an angle less than 30 degrees with the tangent at the discharge point.

2. The wire feeding mechanism according to claim 1, characterized in that: It comprises: two pairs of the wire feeding pressure wheels and the wire feeding driving wheels; and The wire inlet pipe and the wire outlet pipe are respectively located in front and behind the two pairs of wire feeding pressure wheels and the wire feeding drive wheel; The wire feeding tube is located between the two pairs of wire feeding pressure wheels and the wire feeding driving wheel.

3. The wire feeding mechanism according to claim 2, characterized in that: Also includes: A speed reducer comprising a housing and a reduction gear set located within the housing; The housing comprises a base and a cover plate, the base is provided with a motor shaft hole, and the cover plate is provided with two output shaft holes; The output shaft of the driving motor enters the housing through the motor shaft hole and is connected to the input shaft of the reduction gear set. The input shaft of the reduction gear set is connected to the two output shafts of the reduction gear set through a multi-stage gear. The two output shafts of the reduction gear set have the same rotational speed. The output shafts of the two reduction gear sets respectively pass through the two output shaft holes of the housing and are each fixed with one of the wire feeding drive wheels. The wire feeding pressure wheel is installed outside the casing.

4. The wire feeding mechanism according to claim 3, characterized in that: The housing of the reducer is mounted on a cushion block, and the mounting surface of the cushion block on which the housing is mounted is inclined to the bottom surface of the vehicle body of the U-rib internal welding machine.

5. The wire feeding mechanism according to claim 4, characterized in that: The material of the pad is insulating material.

6. The wire feeding mechanism according to claim 4, characterized in that: The angle of the mounting surface of the cushion block changes with the position of the discharge point.

7. U-rib internal welding wire feeding vehicle, characterized by: Include: The vehicle body moves inside the U-rib along the length direction of the U-rib; The wire feeding mechanism according to any one of claims 1 to 6.

8. The U-rib internal welding wire feeding vehicle according to claim 7, characterized in that: Also includes: The upper top wheel is pressed tightly against the top plate when the vehicle body moves in the U-rib, and the upper top wheel is connected to the output end of the air cylinder or the hydraulic cylinder.

9. The U-rib internal welding wire feeding vehicle according to claim 7, characterized in that: Also includes: The welding wire reel can rotate freely around its central axis, and the welding wire is wound on the welding wire reel.

10. The U-rib internal welding wire feeding vehicle according to claim 9, characterized in that: The central axes of the two welding wire reels coincide with each other; The wire feeding pressure wheels of the two wire feeding mechanisms are coaxial, and the wire feeding drive wheels are coaxial.

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