U-rib inner welding trolley

Abstract

The invention relates to the technical field of U-shaped rib welding, in particular to a U-shaped rib inner welding trolley which comprises a first trolley body, a second trolley body, a third trolley body and a fourth trolley body, the first trolley body walks in a U-shaped rib in the length direction of the U-shaped rib, and a wire reel and a wire feeding mechanism are arranged on the first trolley body; the wire reel can freely rotate around a central shaft of the wire reel, and a welding wire is wound on the wire reel; the wire feeding mechanism is located between the welding gun and the welding wire reel, comprises a wire feeding pressing wheel and a wire feeding driving wheel and is used for conveying a welding wire wound on the welding wire reel to the welding gun, and the point, away from the welding wire reel, of the welding wire is the discharging point of the welding wire reel. 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 at the discharging point is smaller than 30 degrees. The U-rib inner welding trolley is stable and smooth in wire feeding.

Description

Technical Field

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

[0002] Steel box girders are an important part of the load-bearing structure of bridges. Steel box girders are generally orthotropic steel bridge decks, which are mainly used to provide support to prevent bridge deformation. Steel box girders generally include structures such as top plates and bottom plates, and the top plates and bottom plates are generally welded by 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 welding joints between the U-ribs and the steel plates. Summary of the invention

[0004] The purpose of the present invention is to improve the smoothness of conveying welding wire when an internal welding vehicle welds the inner corner of a U-rib, and a U-rib internal welding vehicle is provided.

[0005] The present invention is achieved through the following technical solutions.

[0006] U-rib internal welding machine, used for welding steel box girders, including:

[0007] A first vehicle body moves inside the U-rib along the length direction of the U-rib, and a welding wire reel and a wire feeding mechanism are arranged on the first vehicle body;

[0008] A second car body, located in front of the first car body, and a welding gun is installed on the second car body;

[0009] in,

[0010] The welding wire reel can rotate freely around its central axis, and the welding wire is wound on the welding wire reel;

[0011] The wire feeding mechanism comprises a wire feeding pressure wheel and a wire feeding driving wheel, which are used to feed the welding wire wound on the welding wire reel to the welding gun. The point where the welding wire leaves the welding wire reel is the discharge point of the welding wire reel. The welding wire enters between the wire feeding pressure wheel and the wire feeding driving wheel from a direction with an angle less than 30 degrees with the tangent at the discharge point.

[0012] In one embodiment, the wire feeding mechanism comprises:

[0013] Two pairs of the wire feeding pressure wheels and the wire feeding driving wheels;

[0014] A wire inlet tube and a wire outlet tube are located in front and behind the two pairs of wire feeding pressure wheels and the wire feeding driving wheel;

[0015] The wire feeding tube is located between the two pairs of wire feeding pressure wheels and the wire feeding driving wheel.

[0016] In one embodiment, the wire feeding mechanism further comprises:

[0017] Drive motor;

[0018] A speed reducer, comprising a housing and a speed reduction gear set located in the housing;

[0019] 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;

[0020] The output shaft of the driving motor enters the casing 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 rotation speed. The output shafts of the two reduction gear sets pass through the casing through the two output shaft holes respectively and then are fixed with one wire feeding driving wheel each. The wire feeding pressure wheel is installed on the outside of the casing.

[0021] In one embodiment, the housing of the reducer is mounted on a cushion block, and a mounting surface of the cushion block on which the housing is mounted is inclined to a bottom surface of the first vehicle body.

[0022] In one embodiment, the discharge point of the welding wire on the welding wire reel is located below the welding wire reel, and the wire feeding mechanism is installed upward on the cushion block.

[0023] In one embodiment, the material of the spacer is insulating material.

[0024] In one embodiment, the angle of the mounting surface of the cushion block changes with the position of the discharge point.

[0025] In one embodiment, the U-rib inner welding machine further comprises:

[0026] 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.

[0027] In one embodiment, a driving wheel and a driven wheel are installed at the bottom of the vehicle body, and the upper top wheel is located directly above the driving wheel.

[0028] In one embodiment, two welding guns are installed on the second vehicle body, and the welding guns are used to weld two seams between the U rib and the steel plate respectively;

[0029] The central axes of the two welding wire reels coincide with each other;

[0030] The wire feeding pressure wheels of the two wire feeding mechanisms are coaxial, and the wire feeding driving wheels are coaxial.

[0031] In the technical solution provided by the present invention, the welding wire reel and the wire feeding mechanism are located on the first vehicle body, 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. The change in the welding wire output angle of the welding wire reel and the wire feeding angle of the wire feeding mechanism becomes smaller, and the wire feeding becomes smoother.

[0032] 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 learned through the practice of the embodiments disclosed in the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are used to provide 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 of the present invention.

[0034] Figure 1 A schematic diagram of a first vehicle body structure of a U-rib internal welding vehicle provided in Example 1;

[0035] Figure 2 It is a structural schematic diagram of the wire feeding mechanism in Example 1;

[0036] Figure 3 It is a structural schematic diagram of the wire feeding mechanism in Embodiment 1 from another perspective;

[0037] Figure 4 Schematic diagram of the internal structure of the reducer of the wire feeding mechanism in Example 1;

[0038] Figure 5 It is a structural schematic diagram of the welding wire reel in Example 1;

[0039] Figure 6 is a cross-sectional schematic diagram of the welding wire reel in Example 1;

[0040] Figure 7 This is a schematic diagram of the structure of a U-rib internal welding machine provided in Example 1. DETAILED DESCRIPTION

[0041] 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.

[0042] Example 1

[0043] Reference Figures 1 to 7 This embodiment provides a U-rib inner welding machine for welding steel box girders, comprising:

[0044] A first vehicle body 3 moves inside the U-rib along the length direction of the U-rib, and a welding wire reel 22 and a wire feeding mechanism 2 are arranged on the first vehicle body 3;

[0045] A second car body 27 is located in front of the first car body 3, and a welding gun 28 is installed on the second car body 27;

[0046] in,

[0047] The welding wire reel 22 can rotate freely around its central axis, and the welding wire 100 is wound on the welding wire reel 22;

[0048] The wire feeding mechanism 2 is located between the welding gun and the welding wire reel 22 and includes a wire feeding pressure wheel and a wire feeding driving wheel (refer to Figure 2 The wire feeding pressure wheel 8 and the wire feeding driving wheel 9 are used to convey the welding wire 100 wound on the welding wire reel 22 to the welding gun. The point where the welding wire 100 leaves the welding wire reel 22 is the discharge point of the welding wire reel 22. The welding wire 100 enters between the wire feeding pressure wheel and the wire feeding driving wheel from a direction with an angle less than 30 degrees with the tangent at the discharge point.

[0049] In this embodiment, the welding wire reel 22 and the wire feeding mechanism 2 are located on the first vehicle body 3. The welding wire 100 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 welding wire output angle of the welding wire reel 22 and the wire feeding angle of the wire feeding mechanism 2 becomes smaller, and the wire feeding becomes smoother.

[0050] 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 small as possible to ensure smooth wire feeding.

[0051] This embodiment provides an implementation method of the wire feeding mechanism. Figures 2 to 4 , the wire feeding mechanism comprises:

[0052] Two pairs of the wire feeding pressure wheels 8 and the wire feeding drive wheels 9, the welding wire 100 passes through each pair of the wire feeding pressure wheels 8 and the wire feeding drive wheels 9, and the wire feeding drive wheels 9 provide power, and the wire feeding pressure wheels 8 press the welding wire 100 against the wire feeding drive wheels 9, so as to use friction to pull the welding wire 100 from the welding wire reel 22 and feed it to the welding gun;

[0053] The wire inlet tube 10 and the wire outlet tube 11 are respectively located in front of and behind the two pairs of wire feeding pressure wheels 8 and the wire feeding driving wheel 9;

[0054] The wire feeding tube 12 is located between the two pairs of wire feeding pressure wheels 8 and the wire feeding driving wheel 9.

[0055] The wire inlet pipe 10, the wire outlet pipe 11 and the wire delivery pipe 12 are used to provide guidance for the welding wire 100. In this embodiment, the outer walls of one end of the wire inlet pipe 10 close to the wire feeding pressure wheel 8 and the wire feeding drive wheel 9 and one end of the wire outlet pipe 11 close to the wire feeding pressure wheel 8 and the wire feeding drive wheel 9 are set to be tapered, so as to be closer to the wire feeding pressure wheel 8 and the wire feeding drive wheel 9, provide guidance for the welding wire at a longer distance without increasing the length of the wire feeding mechanism 2.

[0056] When welding the inner angle of the U rib of the steel box girder of the bridge in service, 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 bridge in service, when opening an operating hole on the U rib for the internal welding vehicle to enter the interior thereof, the shorter the length of the operating hole, the better. Correspondingly, the shorter the length of the U rib internal welding vehicle, the better. Therefore, in this embodiment, the outer wall of the end of the wire inlet tube 10 close to the wire feeding pressure wheel 8 and the wire feeding drive wheel 9 and the end of the wire outlet tube 11 close to the wire feeding pressure wheel 8 and the wire feeding drive wheel 9 are set to be conical, so as to provide a longer distance for guiding the welding wire 100 without increasing the length of the wire feeding mechanism 2, thereby reducing the length of the internal welding vehicle.

[0057] In this embodiment, the wire feeding mechanism further comprises:

[0058] Driving motor 13;

[0059] A speed reducer, comprising a housing 14 and a speed reduction gear set located in the housing 14;

[0060] The housing 14 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;

[0061] The output shaft of the driving motor 13 enters the casing 14 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, and the two output shafts of the reduction gear set have the same rotation speed; the output shafts of the two reduction gear sets pass through the casing from the two output shaft holes respectively, and each is fixed with a wire feeding driving wheel 9; the wire feeding pressure wheel is installed on the outside of the casing 14.

[0062] 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, and the tertiary driving gear ( Figure 4The middle three-stage driving gear is located on the side of the secondary driven gear 21 away from the paper surface) and is coaxially fixed on the second transmission shaft 18 with the secondary driven gear 21. Two three-stage driven gears 20 are meshed with the three-stage driving gear. A reducer output shaft 19 is installed on each of the three-stage driven gears 20, and a wire feeding drive wheel 9 is fixed after passing through the cover plate through the output shaft hole; the wire feeding pressure wheel 8 is installed on the outside of the casing 14.

[0063] In this embodiment, the output gears and gears of each stage are arranged in an upper and lower staggered manner, so that the thickness of the reducer is greatly reduced. Furthermore, the housing of the reducer and the base of the wire feeding mechanism are designed to share a part (the cover plate), so that the thickness of the wire feeding mechanism is reduced, and the two wire feeding mechanisms (respectively welding the two connecting seams of the U rib and the steel plate) are placed side by side, thereby reducing the length of the internal welding car. The internal welding car with a smaller length is more suitable for the working scenario of welding the inner corners of the U ribs of the steel box girders of the bridges in service, which will not be described in detail.

[0064] In order to minimize the curvature of the welding wire 100 when it is stored on the welding wire reel 22, the diameter of the welding wire reel 22 is set as large as possible, and the diameter of the welding wire reel 22 is close to the height of the interior of the first body 3 or the height of the U rib. Under this design concept, in this embodiment, the housing 14 of the reducer is installed on the cushion block 7, and the mounting surface of the cushion block 7 on which the housing 14 is mounted is inclined to the bottom surface of the first body 3, so that the welding wire 100 enters the wire feeding path of the wire feeding mechanism from a direction with an angle of less than 30 degrees with the tangent at the discharge point. The cushion block provided in this embodiment changes the overall angle of the wire feeding mechanism, which is easy to implement and adjust.

[0065] In the working scenario of welding the inner corners of the U-rib of the steel box girder of the in-service bridge, the working posture of the welding gun is obliquely upward relative to the first car body 3; the discharge point of the welding wire 100 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 path of the welding wire 100 tends to be a straight line, and the wire feeding is smooth.

[0066] In this embodiment, the material of the pad 7 is an insulating material that meets welding standards.

[0067] As the welding wire 100 is unwound from the welding wire reel 22, the position of the discharge point changes, and the angle of the mounting surface of the pad 7 follows the position change of the discharge point, which can further ensure smooth feeding of the welding wire. A photoelectric sensor can be set on the inner wall of the welding wire reel to monitor the thickness of the welding wire wound thereon, and a wedge-shaped slider is set below the higher end of the mounting 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 the output information of the photoelectric sensor is transmitted to the controller of the linear displacement output device, and the position of the slider is changed to change the angle of the mounting surface of the pad 7.

[0068] In this embodiment, the U-rib inner welding machine further comprises:

[0069] The upper top wheel 5 is pressed tightly against the top plate when the first car body 3 moves in the U-rib, and 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 first car body 3 on the U-rib top plate, thereby increasing the friction force and making the inner welding car run more stably.

[0070] In order to realize the movement of the first vehicle body 3, a front driving wheel 4 and a rear driven wheel are installed at the bottom of the first vehicle body 3, and the upper top wheel 5 is located directly above the front driving wheel 4 of the first vehicle body 3, so the torque is smaller and the clamping effect is easily achieved.

[0071] In this embodiment, two welding guns 28 are installed on the second car body 27, and the welding guns 28 are used to weld two seams between the U rib and the steel plate respectively;

[0072] The central axes of the two welding wire reels 22 coincide with each other;

[0073] The wire feeding pressure wheels 8 of the two wire feeding mechanisms 2 are coaxial, and the wire feeding driving wheels 9 are coaxial.

[0074] The two welding guns 28 weld simultaneously, and the inner welding vehicle can complete the welding of the two seams between the U rib and the steel plate in one trip. Compared with the technical solution of staggered arrangement of the two welding wire reels 22 and staggered arrangement of the two wire feeding mechanisms 2, placing the welding wire reels 22 and the wire feeding mechanisms 2 side by side can reduce the length of the inner welding vehicle. The inner welding vehicle with a smaller length is more suitable for the working scene of welding the inner corner of the U rib of the steel box girder of the bridge in service, which will not be described in detail.

[0075] 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. The wire reel bracket 23 has a through hole and is assembled on the bottom plate of the first vehicle body 3 by screws.

[0076] The U-rib internal welding vehicle provided in this embodiment may also be used for inner cavity welding in other narrow spaces similar to U-ribs.

[0077] In the description of the present invention, it is necessary to understand that the terms "up", "down", "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 drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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.

[0078] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0079] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0080] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. U-rib internal welding machine, used for welding steel box beams, characterized by: Include: A first vehicle body moves inside the U-rib along the length direction of the U-rib, and a welding wire reel and a wire feeding mechanism are arranged on the first vehicle body; A second car body, located in front of the first car body, and a welding gun is installed on the second car body; in, The welding wire reel can rotate freely around its central axis, and the welding wire is wound on the welding wire reel; The wire feeding mechanism comprises a wire feeding pressure wheel and a wire feeding driving wheel, which are used to feed the welding wire wound on the welding wire reel to the welding gun. The point where the welding wire leaves the welding wire reel is the discharge point of the welding wire reel. The welding wire enters between the wire feeding pressure wheel and the wire feeding driving wheel from a direction with an angle less than 30 degrees with the tangent at the discharge point.

2. The U-rib inner welding machine according to claim 1, characterized in that: The wire feeding mechanism comprises: Two pairs of the wire feeding pressure wheels and the wire feeding driving wheels; A wire inlet tube and a wire outlet tube are located in front and behind the two pairs of wire feeding pressure wheels and the wire feeding driving wheel; The wire feeding tube is located between the two pairs of wire feeding pressure wheels and the wire feeding driving wheel.

3. The U-rib inner welding vehicle according to claim 2, characterized in that: The wire feeding mechanism further comprises: Drive motor; A speed reducer, comprising a housing and a speed reduction gear set located in 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 rotation speed. The output shafts of the two reduction gear sets pass through the housing through the two output shaft holes and are each fixed with one of the wire feeding drive wheels. The wire feeding pressure wheel is installed outside the casing.

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

5. The U-rib inner welding vehicle according to claim 4, characterized in that: The discharge point of the welding wire on the welding wire reel is located below the welding wire reel, and the wire feeding mechanism is installed upward on the cushion block.

6. The U-rib inner welding vehicle according to claim 4, characterized in that: The material of the cushion block is insulating material.

7. A U-rib inner welding machine 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.

8. The U-rib inner welding machine according to claim 1, 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 inner welding vehicle according to claim 8, characterized in that: A driving wheel and a driven wheel are installed at the bottom of the vehicle body, and the upper top wheel is located directly above the driving wheel.

10. The U-rib inner welding machine according to claim 1, characterized in that: Two welding guns are installed on the second car body, and the welding guns are used to weld two seams between the U rib and the steel plate respectively; 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 driving wheels are coaxial.

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