Box girder prestress positioning mesh splicing and welding mechanism

Abstract

The invention relates to the technical field of building construction, in particular to a box girder prestress positioning mesh splicing and welding mechanism which comprises a mesh splicing module used for constructing mesh templates of a plurality of box girder steel bar prestress positioning meshes and splicing the corresponding box girder steel bar prestress positioning meshes according to the mesh templates; the welding module comprises an identification unit used for identifying welding areas of the box girder reinforcing steel bar prestress positioning meshes and a welding unit used for conducting shielded welding on the welding areas; the detection module is used for acquiring images of all the welding areas and detecting crack characteristics of all the welding areas and whether air holes exist or not; and the control module is used for determining the welding stability according to the crack characteristics of all the welding areas, determining the welding seam smoothness according to the images of all the welding areas and judging whether welding parameters need to be adjusted or not. According to the box girder steel bar prestress positioning net piece splicing device, automatic splicing of the box girder steel bar prestress positioning net piece is achieved, and the welding quality and production efficiency of the box girder steel bar prestress positioning net piece can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a box beam prestressed positioning mesh assembly and welding mechanism. Background Art

[0002] The box girder steel prestressed positioning mesh is a steel welded structure used in the construction of prestressed concrete box girders, mainly used to control the position and shape of the prestressed channel. When making traditional positioning meshes, the steel bars arranged vertically and horizontally are welded to form a steel mesh. The extraction pipe passes through the steel mesh and is fixed by the steel mesh. However, when welding the steel mesh, the welders mostly hold the steel bars by hand. Since welding requires precise positioning, the positioning meshes welded by hand holding the steel bars mostly do not meet the requirements of the specifications, resulting in large material losses and more labor time.

[0003] Chinese patent publication number CN113714436B provides an apparatus and a manufacturing method for automatically manufacturing railway prefabricated box girder positioning steel mesh. A vertical rib manufacturing machine, a first transverse rib manufacturing machine, and a second transverse rib manufacturing machine are arranged outside the mold. Each of these steel bar manufacturing machines includes a flat straightening mechanism, a steel bar feeding mechanism, a vertical straightening mechanism, a shearing mechanism, and a welding mechanism arranged in sequence; the flat straightening mechanism is used to straighten the steel bars in the horizontal direction; the steel bar feeding mechanism is between the flat straightening mechanism and the vertical straightening mechanism, and is used to move the steel bars and feed them onto the mold platform groove; the vertical straightening mechanism is used to straighten the steel bars in the vertical direction; the shearing mechanism is used to cut the steel bars after feeding them to a predetermined length; and the welding mechanism is used to weld the intersections of the fed steel bars.

[0004] It can be seen that the above invention has the following problems: the manufacturing efficiency of the box girder positioning steel mesh is relatively low, and it is difficult to ensure the welding quality. Summary of the invention

[0005] To this end, the present invention provides a box girder prestressed positioning mesh assembly and welding mechanism to overcome the problems of low production efficiency and low welding quality of the box girder prestressed positioning mesh in the prior art.

[0006] To achieve the above object, the present invention provides a box girder prestressed positioning mesh assembly welding mechanism, comprising:

[0007] A mesh assembly module, which is used to construct a plurality of mesh templates of box girder steel bar prestressed positioning meshes according to the box girder structure, and assemble the corresponding box girder steel bar prestressed positioning meshes according to each of the mesh templates;

[0008] A welding module, which is connected to the mesh assembly module, and includes an identification unit for identifying the welding area of ​​each box girder steel bar prestressed positioning mesh, and a welding unit for performing protective welding on each welding area;

[0009] The identification unit determines a number of characteristic points according to the mesh template, and determines the welding area according to the plastic deformation amount of each characteristic point and the surface flatness of each box girder steel bar prestressed positioning mesh;

[0010] A detection module connected to the welding module to obtain images of each welding area and detect crack characteristics and whether there are pores in each welding area; the crack characteristics include crack area and crack number;

[0011] A control module is connected to the detection module and the welding module respectively, and is used to determine the welding stability according to the crack characteristics of each welding area, determine the weld smoothness according to the image of each welding area, and determine whether it is necessary to adjust the welding parameters of the welding unit according to the welding stability, weld smoothness and whether there are pores, wherein the adjustment method of each welding parameter is determined according to the crack characteristics of each welding area and the weld smoothness, and the welding parameters include welding current, welding voltage, welding speed and shielding gas flow rate.

[0012] Furthermore, the mesh assembly module includes:

[0013] A template construction unit, which is used to construct a mesh template of a plurality of box girder steel bar prestressed positioning meshes according to the box girder structure;

[0014] A mesh assembly unit is connected to the template construction unit and is used to assemble corresponding box girder steel bar prestressed positioning meshes according to each mesh template.

[0015] Furthermore, the identification unit includes:

[0016] A feature point determination subunit, connected to the template construction unit, for determining a number of feature points according to the distance between any two intersection point pairs in each mesh template;

[0017] The welding area identification subunit is connected to the feature point determination subunit and is used to determine the welding area according to the plastic deformation amount of each feature point position and the surface flatness of each box girder steel bar prestressed positioning mesh.

[0018] Furthermore, the welding unit comprises:

[0019] A welding area analysis subunit, which is used to perform analysis according to each of the welding areas to determine the gas flow rate of the shielding gas;

[0020] a gas supply subunit connected to the welding area analysis subunit and configured to supply the shielding gas according to the gas flow rate of the shielding gas determined by the welding area analysis subunit;

[0021] The welding subunit is connected to the identification unit and is used to perform protective welding on each welding area.

[0022] Furthermore, the detection module processes the image of each welding area based on a preset image processing method to obtain the degree of pixel change fluctuation of each welding area image.

[0023] Furthermore, the control module comprises:

[0024] A welding stability determination unit, connected to the detection module, for determining welding stability according to crack characteristics of each welding area;

[0025] A weld smoothness determination unit, connected to the detection module, for determining the weld smoothness according to the pixel variation fluctuation degree of each welding area image;

[0026] a determination unit, which is connected to the detection module, the welding stability determination unit and the weld smoothness determination unit respectively, and is used to determine whether it is necessary to adjust the welding parameters of the welding unit according to the welding stability, the weld smoothness and whether there are pores;

[0027] The adjusting unit is connected to the determining unit and is used to adjust the welding parameters of the welding unit based on the determination result that the welding parameters need to be adjusted by the determining unit.

[0028] Furthermore, the welding area identification subunit determines the welding origin based on the comparison result of the plastic deformation amount of each characteristic point position with the standard plastic deformation amount, determines the welding range coefficient according to the comparison result of the surface flatness of each box girder steel bar prestressed positioning mesh with the standard surface flatness, and determines the welding area according to the welding origin and the welding range coefficient.

[0029] Furthermore, the welding stability determination unit determines the welding stability according to the number of cracks in each welding area, the total area of ​​cracks and the area of ​​the corresponding welding area.

[0030] Further, the determination unit determines whether it is necessary to adjust the welding parameters of the welding unit based on a comparison result between the welding stability and a preset welding stability, a comparison result between the weld smoothness and a preset weld smoothness, and whether there are pores.

[0031] Further, the adjustment unit determines the adjustment method of each welding parameter based on the comparison result between the welding stability and the preset welding stability and the comparison result between the weld smoothness and the preset weld smoothness, wherein:

[0032] If the welding stability is greater than the preset welding stability, the welding current and the welding speed are adjusted, and the adjustment range is determined according to the difference between the welding stability and the preset welding stability;

[0033] If the weld smoothness is greater than the preset weld smoothness, the welding voltage is adjusted, and the adjustment range is determined according to the difference between the weld smoothness and the preset weld smoothness.

[0034] Compared with the prior art, the beneficial effect of the present invention is that the present invention is provided with a mesh assembly module, and by constructing a mesh template to assemble the corresponding box girder steel bar prestressed positioning mesh, the assembly efficiency of the box girder steel bar prestressed positioning mesh can be improved, thereby improving production efficiency. The welding module is provided with an identification unit and a welding unit, and by automatically identifying the welding area for protective welding, the welding efficiency can be improved, thereby improving production efficiency. A control module is provided to determine whether the welding parameters of the welding unit need to be adjusted according to the detection results of the detection module, so as to improve the welding quality of the box girder steel bar prestressed positioning mesh.

[0035] Furthermore, the identification unit of the present invention is provided with a feature point determination subunit and a welding area identification subunit, which can improve the accuracy of determining the welding area by determining the feature points of the mesh template and determining the welding area according to the plastic deformation amount of each feature point position and the surface flatness of each box girder steel bar prestressed positioning mesh, thereby improving the welding quality.

[0036] Furthermore, the welding unit of the present invention is provided with a welding area analysis subunit, a gas supply subunit and a welding subunit, and the gas flow rate of the shielding gas is determined by analyzing each welding area, thereby improving the welding quality.

[0037] Furthermore, the control module of the present invention is provided with a welding stability determination unit, a weld smoothness determination unit, a judgment unit and an adjustment unit. By judging whether the welding parameters need to be adjusted according to the welding stability, weld smoothness and whether there are pores, not only the welding efficiency can be improved but also the welding quality can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural block diagram of a box girder prestressed positioning mesh assembly welding mechanism according to an embodiment of the present invention;

[0039] Figure 2 It is a structural block diagram of a mesh assembly module according to an embodiment of the present invention;

[0040] Figure 3 is a structural block diagram of an identification unit according to an embodiment of the present invention;

[0041] Figure 4 is a structural block diagram of a control module according to an embodiment of the present invention;

[0042] Figure 5 It is a structural schematic diagram of a box girder prestressed positioning mesh assembly and welding mechanism according to an embodiment of the present invention;

[0043] In the figure: 1. Mesh assembly module; 2. Welding module; 3. Detection module; 4. Control module; 5. Box girder steel bar prestressed positioning mesh; 6. Air supply subunit; 7. Welding subunit; 8. Conveyor belt. DETAILED DESCRIPTION

[0044] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0045] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0046] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0047] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] See also Figure 1 As shown, it is a structural block diagram of the box girder prestressed positioning mesh assembly welding mechanism according to an embodiment of the present invention;

[0049] The embodiment of the present invention provides a box girder prestressed positioning mesh assembly welding mechanism, comprising:

[0050] A mesh assembly module, which is used to construct a plurality of mesh templates of box girder steel bar prestressed positioning meshes according to the box girder structure, and assemble the corresponding box girder steel bar prestressed positioning meshes according to each of the mesh templates;

[0051] See also Figure 2As shown, it is a structural block diagram of a mesh assembly module according to an embodiment of the present invention; specifically, the mesh assembly module includes:

[0052] A template construction unit, which is used to construct a mesh template of a plurality of box girder steel bar prestressed positioning meshes according to the box girder structure;

[0053] A mesh assembly unit is connected to the template construction unit and is used to assemble corresponding box girder steel bar prestressed positioning meshes according to each mesh template.

[0054] During implementation, the template construction unit constructs the mesh template according to the box girder structure to ensure that the shape, size, etc. of the prestressed duct in the mesh template are consistent with the box girder structure. In the actual implementation process, a steel bar straightening machine can be used to straighten the coiled steel bars, and a cutting machine can be used to cut the steel bars required for processing the box girder steel bar prestressed positioning mesh. The mesh assembly unit assembles a single box girder steel bar prestressed positioning mesh according to the mesh template.

[0055] It can be understood that after all the box girder steel bar prestressed positioning meshes are assembled and welded, they can be combined and installed according to the connection structure of each mesh template to achieve a rapid installation and positioning function.

[0056] A welding module, which is connected to the mesh assembly module, and includes an identification unit for identifying the welding area of ​​each box girder steel bar prestressed positioning mesh, and a welding unit for performing protective welding on each welding area;

[0057] The identification unit determines a number of characteristic points according to the mesh template, and determines the welding area according to the plastic deformation amount of each characteristic point and the surface flatness of each box girder steel bar prestressed positioning mesh;

[0058] See also Figure 3 As shown, it is a structural block diagram of the identification unit of an embodiment of the present invention; specifically, the identification unit includes:

[0059] A feature point determination subunit, connected to the template construction unit, for determining a number of feature points according to the distance between any two intersection point pairs in each mesh template;

[0060] In implementation, the intersection point pairs between any two steel bars can be determined, the distance between each intersection point pair can be calculated, and the midpoints of the two points in the intersection point pair whose distance is less than the preset distance threshold can be used as feature points. The actual implementation personnel can set the preset distance threshold according to the actual situation or based on the maximum mesh length of the mesh template. Among them, the intersection point pair refers to any two points formed by the intersection of different steel bars in the steel mesh.

[0061] The welding area identification subunit is connected to the feature point determination subunit and is used to determine the welding area according to the plastic deformation amount of each feature point position and the surface flatness of each box girder steel bar prestressed positioning mesh.

[0062] In implementation, there is no limitation on the method and equipment for determining the plastic deformation amount of each characteristic point position and the surface flatness of the prestressed positioning mesh of the box girder steel bars. For example, an electromagnetic ultrasonic system can be used to measure the propagation speed of surface waves in two orthogonal directions to achieve non-destructive detection of the plastic deformation amount of the characteristic point position; the three-dimensional point cloud data of each position of the prestressed positioning mesh of the box girder steel bars can be scanned based on a three-dimensional laser scanning device, and the three-dimensional model of the prestressed positioning mesh of the box girder steel bars can be reconstructed according to the scanned three-dimensional point cloud data. The flatness of the prestressed positioning mesh of the box girder steel bars can be determined by constructing a reference surface or using professional analysis software. This is a prior art and will not be repeated here.

[0063] Specifically, the welding area identification subunit determines the welding origin based on the comparison result of the plastic deformation amount of each characteristic point position with the standard plastic deformation amount, determines the welding range coefficient according to the comparison result of the surface flatness of each box girder steel bar prestressed positioning mesh with the standard surface flatness, and determines the welding area according to the welding origin and the welding range coefficient.

[0064] In implementation, the plastic deformation amount at each feature point position is compared with the standard plastic deformation amount, and the corresponding feature point whose plastic deformation amount is greater than the standard plastic deformation amount is determined as the welding origin, and the ratio of the standard surface flatness to the surface flatness of each of the box girder steel bar prestressed positioning mesh is determined as the corresponding welding range coefficient. The greater the flatness of the surface flatness of each of the box girder steel bar prestressed positioning mesh, the better the flatness, and the smaller the corresponding welding range, that is, the smaller the welding range coefficient. The actual implementation personnel can set the standard surface flatness according to the actual situation or based on the average surface flatness of the box girder steel bar prestressed positioning mesh that has passed the qualification test in the historical data, and set the standard welding area diameter based on the average welding area diameter corresponding to the standard surface flatness. The product of the standard welding area diameter and each welding range coefficient is the welding area diameter of the corresponding position. Preferably, the standard surface flatness value range is set to 0.7-0.8, and the standard welding area diameter value range is set to 5mm-10mm. The welding area is a circular area with the welding origin as the center and the welding area diameter as the diameter.

[0065] The identification unit of the present invention is provided with a feature point determination subunit and a welding area identification subunit. By determining the feature points of the mesh template and determining the welding area according to the plastic deformation amount of each feature point position and the surface flatness of each box girder steel bar prestressed positioning mesh, the accuracy of determining the welding area can be improved, thereby improving the welding quality.

[0066] Specifically, the welding unit comprises:

[0067] A welding area analysis subunit, which is used to perform analysis according to each of the welding areas to determine the gas flow rate of the shielding gas;

[0068] In implementation, the gas flow rate of the shielding gas may be determined according to the product of the welding range coefficient and the standard gas flow rate.

[0069] It can be understood that the actual implementers can set the standard gas flow rate according to the actual situation or based on the average gas flow rate of the protective gas corresponding to the standard welding area diameter of the box girder steel bar prestressed positioning mesh that has passed the qualification test in historical data. Preferably, the value range of the standard gas flow rate is set to 15L / min~25L / min.

[0070] a gas supply subunit connected to the welding area analysis subunit and configured to supply the shielding gas according to the gas flow rate of the shielding gas determined by the welding area analysis subunit;

[0071] In implementation, there is no limitation on the specific structure of the gas delivery subunit, and it is only required to complete the delivery of the protective gas according to the determined protective gas flow rate, which will not be elaborated here.

[0072] It is understandable that the shielding gas may be carbon dioxide, argon, neon, nitrogen or a mixture of any of these gases, which can improve welding quality, reduce spatter and stabilize the arc.

[0073] The welding subunit is connected to the identification unit and is used to perform protective welding on each welding area.

[0074] In implementation, the welding subunit includes at least a welding gun, a wire feeding structure, and a movable device for controlling the movement of the welding gun and the wire feeding structure. The movable device can complete the moving operation through a robotic arm, and the wire feeding structure can transport the welding wire at a uniform speed. There is no limitation on the specific structure. These are all existing technologies and will not be elaborated here.

[0075] The welding unit of the present invention is provided with a welding area analysis subunit, a gas supply subunit and a welding subunit, and the gas flow rate of the protective gas is determined by analyzing each welding area, so that the welding quality can be improved.

[0076] A detection module connected to the welding module to obtain images of each welding area and detect crack characteristics and whether there are pores in each welding area; the crack characteristics include crack area and crack number;

[0077] In implementation, the number of cracks on the surface of the welding area and the crack area of ​​each crack can be identified based on the images of each welding area, and the number of cracks inside the welding area and the crack area of ​​each crack can be detected by ultrasonic detection or X-ray detection. These are all existing technologies and will not be elaborated here.

[0078] It is understandable that there is no limitation on the method for detecting whether pores exist. For example, ultrasonic detection or infrared thermal imaging equipment can be used to determine whether pores exist. This is a prior art and will not be described in detail.

[0079] Specifically, the detection module processes the image of each welding area based on a preset image processing method to obtain the pixel change fluctuation degree of each welding area image.

[0080] In implementation, the preset image processing methods include constructing a grayscale co-occurrence matrix (by constructing a grayscale co-occurrence matrix, the characteristic values ​​of the image texture, such as contrast, can be calculated to represent the degree of pixel change fluctuation), grayscale processing (by grayscale processing the image, converting each welding area image into a grayscale image, the mean of all pixel values ​​in the extreme image, and calculating the standard deviation of each pixel value to represent the degree of pixel change fluctuation) and other methods.

[0081] A control module is connected to the detection module and the welding module respectively, and is used to determine the welding stability according to the crack characteristics of each welding area, determine the weld smoothness according to the image of each welding area, and determine whether it is necessary to adjust the welding parameters of the welding unit according to the welding stability, weld smoothness and whether there are pores, wherein the adjustment method of each welding parameter is determined according to the crack characteristics of each welding area and the weld smoothness, and the welding parameters include welding current, welding voltage, welding speed and shielding gas flow rate.

[0082] See also Figure 4 As shown, it is a structural block diagram of a control module according to an embodiment of the present invention; specifically, the control module includes:

[0083] A welding stability determination unit, connected to the detection module, for determining welding stability according to crack characteristics of each welding area;

[0084] Specifically, the welding stability determination unit determines the welding stability according to the number of cracks in each welding region, the total area of ​​cracks and the area of ​​the corresponding welding region.

[0085] In implementation, if the number of cracks in any of the welding areas is greater than a preset number threshold, the welding stability is determined to be 1; if the number of cracks in each of the welding areas is less than or equal to the preset number threshold, the total crack area of ​​the corresponding welding area is determined according to the sum of the crack areas of each welding area, the regional stability of the corresponding welding area is determined according to the ratio of the total crack area of ​​each welding area to the area of ​​the corresponding welding area, and the welding stability is determined according to the average of the regional stabilities corresponding to all welding areas. For example, there are 5 There are welding zones, the welding zone areas of each welding zone are 1, 2, 3, 4, and 5 respectively, the total crack areas of each welding zone are 0, 0.02, 0.03, 0.04, and 0.05 respectively, and the regional stability of each welding zone is 0, 0.02 / 2=0.01, 0.03 / 3=0.01, 0.04 / 4=0.01, and 0.05 / 5=0.01 respectively, then the welding stability is (0+0.01+0.01+0.01+0.01) / 5=0.008.

[0086] It can be understood that the value range of welding stability is 0 to 1, and a welding stability of 1 indicates that the welding effect is relatively poor, and a welding stability of 0 indicates that the welding effect is relatively good.

[0087] A weld smoothness determination unit, connected to the detection module, for determining the weld smoothness according to the pixel variation fluctuation degree of each welding area image;

[0088] In implementation, the pixel variation fluctuation degree of each welding area image can be determined as the regional smoothness of each welding area, and then the average of the regional smoothness of all welding areas can be determined as the weld smoothness.

[0089] It can be understood that the smaller the weld smoothness, the better the forming quality of the weld is and the weld can have a smooth transition.

[0090] a determination unit, which is connected to the detection module, the welding stability determination unit and the weld smoothness determination unit respectively, and is used to determine whether it is necessary to adjust the welding parameters of the welding unit according to the welding stability, the weld smoothness and whether there are pores;

[0091] Specifically, the determination unit determines whether it is necessary to adjust the welding parameters of the welding unit based on the comparison result between the welding stability and the preset welding stability, the comparison result between the weld smoothness and the preset weld smoothness, and whether there are pores.

[0092] In implementation, if pores exist, or the welding stability is greater than a preset welding stability, or the weld smoothness is greater than a preset weld smoothness, it is necessary to adjust the welding parameters of the welding unit.

[0093] The adjusting unit is connected to the determining unit and is used to adjust the welding parameters of the welding unit based on the determination result that the welding parameters need to be adjusted by the determining unit.

[0094] Specifically, the adjustment unit determines the adjustment method of each welding parameter based on the comparison result between the welding stability and the preset welding stability and the comparison result between the weld smoothness and the preset weld smoothness, wherein:

[0095] If the welding stability is greater than the preset welding stability, the welding current and the welding speed are adjusted, and the adjustment range is determined according to the difference between the welding stability and the preset welding stability;

[0096] In implementation, a first intermediate value is determined based on the difference between the welding stability and the preset welding stability, a second intermediate value is determined based on the ratio of the first difference to the preset welding stability, an adjustment range of the welding current is determined based on the product of the second intermediate value and the preset welding current, and an adjustment range of the welding speed is determined based on the product of the second intermediate value and the preset welding speed.

[0097] If the weld smoothness is greater than the preset weld smoothness, the welding voltage is adjusted, and the adjustment range is determined according to the difference between the weld smoothness and the preset weld smoothness.

[0098] In implementation, the third intermediate value is determined according to the difference between the weld smoothness and the preset weld smoothness, the fourth intermediate value is determined according to the ratio of the third intermediate value to the preset weld smoothness, and the adjustment range of the welding voltage is determined according to the product of the fourth intermediate value and the preset welding voltage.

[0099] It can be understood that the actual implementer can determine the preset welding current based on the actual situation or based on the minimum value of the welding current that passes the qualification test in the historical data, the actual implementer can determine the preset welding speed based on the actual situation or based on the minimum value of the welding speed that passes the qualification test in the historical data, and the actual implementer can determine the preset welding voltage based on the actual situation or based on the minimum value of the welding voltage that passes the qualification test in the historical data. Preferably, the preset welding current value range is set to 150A~250A, the preset welding speed value range is set to 40cm / min~50cm / min, and the preset welding voltage value range is set to 25V~36V.

[0100] It can be understood that the preset welding stability value range is set to 0.3-0.5, and the preset weld smoothness value range is set to 0.5-1.

[0101] The control module of the present invention is provided with a welding stability determination unit, a weld smoothness determination unit, a judgment unit and an adjustment unit. By judging whether the welding parameters need to be adjusted according to the welding stability, weld smoothness and whether there are pores, not only the welding efficiency can be improved, but also the welding quality can be guaranteed.

[0102] In a specific embodiment, see Figure 5 As shown, it is a structural schematic diagram of the box girder prestressed positioning mesh assembly and welding mechanism of an embodiment of the present invention; in the figure: mesh assembly module 1, welding module 2, detection module 3, control module 4, box girder steel bar prestressed positioning mesh 5, air supply subunit 6, welding subunit 7, conveyor belt 8.

[0103] In implementation, a mesh template of a box girder steel bar prestressed positioning mesh 5 is constructed by a mesh assembly module 1, and the mesh template is used for assembly. The assembled box girder steel bar prestressed positioning mesh 5 is conveyed to a welding module 2 by a conveyor belt 8. First, the welding area is identified by an identification unit (not shown) of the welding module. Then, the welding unit analyzes the welding area to determine the gas flow rate of the shielding gas delivered by the gas supply subunit 6. The gas supply subunit 6 starts to deliver the shielding gas. The welding subunit 7 includes a movable device (not shown) that can move the welding gun and the welding wire to align the welding area for welding. The welding of the initial welding is The connection current is the preset welding current, the welding voltage is the preset welding voltage, and the welding speed is the preset welding speed. After welding is completed, it is transmitted to the detection module 3 through the transmission belt. The image of each welding area is obtained through the image acquisition device (not marked) and the ultrasonic detection device (not marked) in the detection module, and the crack characteristics of each welding area and the presence of pores are detected, and the detection results are transmitted to the control module 4 for subsequent judgment and analysis. If the control module 4 determines that the welding parameters of the welding unit need to be adjusted, the corresponding welding parameters are adjusted, and the welding module 2 is controlled to perform subsequent welding work with the corresponding welding parameters.

[0104] The present invention is provided with a mesh assembly module, and by constructing a mesh template to assemble the corresponding box girder steel bar prestressed positioning mesh, the assembly efficiency of the box girder steel bar prestressed positioning mesh can be improved, thereby improving production efficiency. The welding module is provided with an identification unit and a welding unit, and by automatically identifying the welding area for protective welding, the welding efficiency can be improved, thereby improving production efficiency. A control module is provided, and it is determined whether the welding parameters of the welding unit need to be adjusted according to the detection result of the detection module, so as to improve the welding quality of the box girder steel bar prestressed positioning mesh.

[0105] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A box girder prestressed positioning mesh assembly and welding mechanism, characterized in that: include: A mesh assembly module, which is used to construct a plurality of mesh templates of box girder steel bar prestressed positioning meshes according to the box girder structure, and assemble the corresponding box girder steel bar prestressed positioning meshes according to each of the mesh templates; A welding module, which is connected to the mesh assembly module, and includes an identification unit for identifying the welding area of ​​each box girder steel bar prestressed positioning mesh, and a welding unit for performing protective welding on each welding area; The identification unit determines a number of characteristic points according to the mesh template, and determines the welding area according to the plastic deformation amount of each characteristic point and the surface flatness of each box girder steel bar prestressed positioning mesh; A detection module connected to the welding module to obtain images of each welding area and detect crack characteristics and whether there are pores in each welding area; the crack characteristics include crack area and crack number; A control module is connected to the detection module and the welding module respectively, and is used to determine the welding stability according to the crack characteristics of each welding area, determine the weld smoothness according to the image of each welding area, and determine whether it is necessary to adjust the welding parameters of the welding unit according to the welding stability, weld smoothness and whether there are pores, wherein the adjustment method of each welding parameter is determined according to the crack characteristics of each welding area and the weld smoothness, and the welding parameters include welding current, welding voltage and welding speed.

2. The box beam prestressed positioning mesh assembly and welding mechanism according to claim 1 is characterized in that: The mesh assembly module comprises: A template construction unit, which is used to construct a mesh template of a plurality of box girder steel bar prestressed positioning meshes according to the box girder structure; A mesh assembly unit is connected to the template construction unit and is used to assemble corresponding box girder steel bar prestressed positioning meshes according to each mesh template.

3. The box beam prestressed positioning mesh assembly and welding mechanism according to claim 2 is characterized in that: The identification unit comprises: A feature point determination subunit, connected to the template construction unit, for determining a number of feature points according to the distance between any two intersection point pairs in each mesh template; The welding area identification subunit is connected to the feature point determination subunit and is used to determine the welding area according to the plastic deformation amount of each feature point position and the surface flatness of each box girder steel bar prestressed positioning mesh.

4. The box beam prestressed positioning mesh assembly and welding mechanism according to claim 3 is characterized in that: The welding unit comprises: A welding area analysis subunit, which is used to perform analysis according to each of the welding areas to determine the gas flow rate of the shielding gas; a gas supply subunit connected to the welding area analysis subunit and configured to supply the shielding gas according to the gas flow rate of the shielding gas determined by the welding area analysis subunit; The welding subunit is connected to the identification unit and is used to perform protective welding on each welding area.

5. The box beam prestressed positioning mesh assembly and welding mechanism according to claim 4 is characterized in that: The detection module processes the image of each welding area based on a preset image processing method to obtain the pixel change fluctuation degree of each welding area image.

6. The box beam prestressed positioning mesh assembly and welding mechanism according to claim 5 is characterized in that: The control module comprises: A welding stability determination unit, connected to the detection module, for determining welding stability according to crack characteristics of each welding area; A weld smoothness determination unit, connected to the detection module, for determining the weld smoothness according to the pixel variation fluctuation degree of each welding area image; a determination unit, which is connected to the detection module, the welding stability determination unit and the weld smoothness determination unit respectively, and is used to determine whether it is necessary to adjust the welding parameters of the welding unit according to the welding stability, the weld smoothness and whether there are pores; The adjusting unit is connected to the determining unit and is used to adjust the welding parameters of the welding unit based on the determination result that the welding parameters need to be adjusted by the determining unit.

7. The box beam prestressed positioning mesh assembly and welding mechanism according to claim 6 is characterized in that: The welding area identification subunit determines the welding origin based on the comparison result of the plastic deformation amount of each characteristic point position with the standard plastic deformation amount, determines the welding range coefficient according to the comparison result of the surface flatness of each box girder steel bar prestressed positioning mesh with the standard surface flatness, and determines the welding area according to the welding origin and the welding range coefficient.

8. The box beam prestressed positioning mesh assembly and welding mechanism according to claim 7 is characterized in that: The welding stability determination unit determines the welding stability according to the number of cracks in each welding region, the total area of ​​the cracks and the area of ​​the corresponding welding region.

9. The box beam prestressed positioning mesh assembly and welding mechanism according to claim 8, characterized in that: The determination unit determines whether it is necessary to adjust the welding parameters of the welding unit based on a comparison result of the welding stability with a preset welding stability, a comparison result of the weld smoothness with a preset weld smoothness, and whether there is pores.

10. The box beam prestressed positioning mesh assembly and welding mechanism according to claim 9, characterized in that: The adjustment unit determines the adjustment method of each welding parameter based on the comparison result between the welding stability and the preset welding stability and the comparison result between the weld smoothness and the preset weld smoothness, wherein: If the welding stability is greater than the preset welding stability, the welding current and the welding speed are adjusted, and the adjustment range is determined according to the difference between the welding stability and the preset welding stability; If the weld smoothness is greater than the preset weld smoothness, the welding voltage is adjusted, and the adjustment range is determined according to the difference between the weld smoothness and the preset weld smoothness.

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