Prefabricated box girder prestress positioning mesh welding production equipment

Abstract

The invention relates to the technical field of positioning mesh welding, in particular to prefabricated box girder prestress positioning mesh welding production equipment which comprises a reinforcing steel bar machining module, a welding module and a welding module. The welding module comprises a welding table used for providing a welding platform and a welding gun used for welding the positioning mesh; the detection module comprises a voltage sensor which is connected with the welding gun and is used for detecting the working voltage of the welding gun, a vibration sensor which is connected with the welding table and is used for detecting the vibration intensity of the welding table, and a visual sensor which is arranged above the welding table and is used for detecting the number of defective welding spots in the positioning mesh; and the control module is connected with the steel bar machining module, the welding module and the detection module and used for determining the preheating duration of the welding gun according to the variance of the fluctuation amplitude of the working voltage of the welding gun. The welding production stability of the positioning mesh is improved.

Description

Technical Field

[0001] The invention relates to the technical field of positioning mesh welding, and in particular to a welding production device for prefabricated box girder prestressed positioning mesh. Background Art

[0002] In the prior art, a positioning mesh steel bar is a steel bar structure used to accurately locate the position of other steel bars in a concrete structure (such as a precast box girder). It is usually composed of crisscrossed steel bars to form a grid-like shape, so it is called a positioning mesh. In the production process of precast box girders, the positioning mesh steel bar plays a vital role. Its main function is to fix and maintain the designed position of the main steel bars, prestressed bars, etc., to ensure that these steel bars will not shift during the concrete pouring process.

[0003] Chinese Patent Publication No.: CN111496411A discloses an automatic welding device for mesh units and a construction method thereof, comprising: a welding manipulator; a pedestal relatively arranged on both sides of the welding manipulator; and a fixed plate that can rotate in the horizontal direction and is rotatably connected to the top of the pedestal, wherein a plurality of clamps are arranged at intervals on the top surface of the fixed plate, and the steel bars are fixed to the fixed plate by the clamps, and then the fixed plate is rotated and the steel bars are welded and connected by the welding manipulator to form a mesh unit. It can be seen that the automatic welding device for mesh units and the construction method thereof have the problem that the metal on the surface of the electrode will gradually wear out because the welding electrode needs to frequently contact the steel bars for discharge welding, and the local heat is too high during welding, resulting in problems with the quality of the weld spot, thereby reducing the stability of the positioning mesh welding production. Summary of the invention

[0004] To this end, the present invention provides a prefabricated box girder prestressed positioning mesh welding production equipment to overcome the problem in the prior art that the welding electrode needs to frequently contact the steel bars for discharge welding, the metal on the electrode surface will gradually wear out, and the local heat is too high during welding, resulting in weld quality problems, thereby reducing the stability of the positioning mesh welding production.

[0005] To achieve the above-mentioned object, the present invention provides a prefabricated box girder prestressed positioning mesh welding production equipment, comprising: a steel bar processing module, comprising a processing unit for processing steel bar raw materials into shaped steel bars and a conveying unit connected to the processing unit for conveying the shaped steel bars to a welding area; a welding module, which is connected to the steel bar processing module, comprising a welding table for providing a welding platform and a welding gun for welding the shaped steel bars to output a positioning mesh; a detection module, which is connected to the welding module, comprising a voltage sensor connected to the welding gun for detecting the working voltage of the welding gun, a vibration sensor connected to the welding table for detecting the vibration intensity of the welding table, and a visual sensor arranged above the welding table for detecting the number of defective welds in the positioning mesh; a control module, which is respectively connected to the steel bar processing module, the welding module and the detection module, and is used to determine the preheating time of the welding gun according to the variance of the fluctuation amplitude of the working voltage of the welding gun, or, determine the welding time of a single weld according to the vibration intensity of the welding table, and determine the welding current of the positioning mesh according to the vibration intensity of the welding table and the proportion of the number of defective welds in the positioning mesh.

[0006] Furthermore, the control module is used to determine whether the stability of the positioning mesh welding production meets the requirements based on the variance of the fluctuation amplitude of the working voltage of the welding gun. If the variance of the fluctuation amplitude of the working voltage of the welding gun is greater than a preset first variance, it is determined that the stability of the positioning mesh welding production does not meet the requirements.

[0007] Furthermore, the control module is used to preliminarily determine that the welding reliability of the positioning mesh does not meet the requirements when the variance of the fluctuation amplitude of the working voltage of the welding gun is greater than the preset first variance and less than or equal to the preset second variance, and determine whether the welding reliability of the positioning mesh meets the requirements based on the vibration intensity of the welding table.

[0008] Furthermore, the control module is used to reduce the preheating time of the welding gun when the variance of the fluctuation amplitude of the working voltage of the welding gun is greater than the preset second variance;

[0009] The reduction range of the preheating time of the welding gun is determined by the difference between the variance of the fluctuation range of the working voltage of the welding gun and a preset second variance.

[0010] Furthermore, the control module is used to determine whether the welding reliability of the positioning mesh meets the requirements according to the vibration intensity of the welding table. If the vibration intensity of the welding table is greater than a preset first vibration intensity, it is determined that the welding reliability of the positioning mesh does not meet the requirements.

[0011] Furthermore, the control module is used to preliminarily determine that the environmental stability of the positioning mesh welding does not meet the requirements when the vibration intensity of the welding table is greater than a preset second vibration intensity, and to determine whether the environmental stability of the positioning mesh welding meets the requirements based on the proportion of defective welds in the positioning mesh.

[0012] Furthermore, the control module is used to increase the welding time of a single welding point when the vibration intensity of the welding table is greater than the preset first vibration intensity and less than or equal to the preset second vibration intensity.

[0013] Furthermore, the increase range of the welding time of the single welding point is determined by the difference between the vibration intensity of the welding table and the preset first vibration intensity.

[0014] Furthermore, the control module is used to determine whether the environmental stability of the positioning mesh welding meets the requirements based on the proportion of the number of defective welds in the positioning mesh. If the proportion of the number of defective welds in the positioning mesh is greater than a preset proportion, it is determined that the environmental stability of the positioning mesh welding does not meet the requirements, and the welding current of the positioning mesh is reduced.

[0015] Furthermore, the reduction range of the welding current of the positioning mesh is determined by the difference between the proportion of the number of defective welds in the positioning mesh and a preset proportion.

[0016] Compared with the prior art, the beneficial effect of the present invention lies in that the equipment of the present invention determines the preheating time of the welding gun according to the variance of the fluctuation amplitude of the working voltage of the welding gun by setting a steel bar processing module, a welding module, a detection module and a control module. Since the welding electrode needs to frequently contact the steel bar for discharge welding, as the number of welding increases, the metal on the surface of the electrode will gradually wear out, resulting in increased resistance, excessive local heat during welding, and quality problems of the weld point. By reducing the preheating time of the welding gun, the situation of excessive heat in the electrode can be reduced, thereby making the weld point more regular. The welding time of a single weld point is determined according to the vibration intensity of the welding table. Since during the welding process of the positioning mesh, the positioning mesh is placed on the welding table and vibration is generated, long-term vibration leads to The screws at the cable joints become loose, resulting in poor contact of the welding equipment. By increasing the welding time of a single weld, the welding time of a single weld can be increased to ensure that the weld has enough heat to fully fuse the steel bars, thereby improving the quality and strength of the weld. The welding current of the positioning mesh is determined according to the proportion of the number of defective welds in the positioning mesh. A large amount of dust and metal debris accumulates on the surface of the welding equipment, which are drawn into the molten pool during the welding process to form inclusions, resulting in defects in the welds of the positioning mesh. By increasing the welding current of the positioning mesh, the temperature of the molten pool is increased, which helps the inclusions to float, and the metal oxide inclusions react with the metal in the high-temperature molten pool to dissolve, reducing the residue of inclusions in the weld, and improving the stability of the positioning mesh welding production.

[0017] Furthermore, the device described in the present invention determines the preheating time of the welding gun by setting a preset first variance and a preset second variance. Since the welding electrode needs to frequently contact the steel bar for discharge welding, as the number of welding increases, the metal on the surface of the electrode will gradually wear, resulting in increased resistance, and local excessive heat during welding, resulting in weld quality problems. By reducing the preheating time of the welding gun, the situation where the electrode is overheated can be reduced, thereby making the weld more regular, further improving the stability of the positioning mesh welding production.

[0018] Furthermore, the equipment described in the present invention determines the welding time of a single welding point by setting a preset first vibration intensity and a preset second vibration intensity. Since vibration is generated when the positioning mesh is placed on the welding table during the welding process of the positioning mesh, long-term vibration causes the screws at the cable joint to loosen, thereby causing poor contact of the welding equipment. By increasing the welding time of a single welding point, the welding time of a single welding point can be increased, which can ensure that the welding point has enough heat to fully fuse the steel bars, thereby improving the quality and strength of the welding point, and further improving the stability of the positioning mesh welding production.

[0019] Furthermore, the device described in the present invention determines the welding current of the positioning mesh by setting a preset ratio. Since a large amount of dust and metal debris will accumulate on the surface of the welding equipment, they will be drawn into the molten pool during the welding process to form inclusions, which will cause defects in the welds of the positioning mesh. By increasing the welding current of the positioning mesh, the temperature of the molten pool is increased, which helps the inclusions to float up, and the metal oxide inclusions react with the metal in the high-temperature molten pool to dissolve, thereby reducing the residual inclusions in the welds, and further improving the stability of the positioning mesh welding production. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an overall structural block diagram of a prefabricated box girder prestressed positioning mesh welding production equipment according to an embodiment of the present invention;

[0021] Figure 2 It is a logic flow chart of the welding production equipment of the prefabricated box girder prestressed positioning mesh according to the embodiment of the present invention;

[0022] Figure 3 A specific structural block diagram of a steel bar processing module of a prefabricated box girder prestressed positioning mesh welding production equipment according to an embodiment of the present invention;

[0023] Figure 4 This is a specific structural block diagram of a welding module of a prefabricated box girder prestressed positioning mesh welding production equipment according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] See also Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, they are respectively the overall structural block diagram, the logic flow chart, the specific structural block diagram of the steel bar processing module and the specific structural block diagram of the welding module of the prefabricated box beam prestressed positioning mesh welding production equipment of the embodiment of the present invention. The present invention is a prefabricated box beam prestressed positioning mesh welding production equipment, comprising:

[0029] A steel bar processing module, comprising a processing unit for processing steel bar raw materials into shaped steel bars and a conveying unit connected to the processing unit for conveying the shaped steel bars to a welding area;

[0030] A welding module, which is connected to the steel bar processing module, and includes a welding table for providing a welding platform and a welding gun for welding the formed steel bars to output a positioning mesh;

[0031] A detection module connected to the welding module, comprising a voltage sensor connected to the welding gun for detecting the working voltage of the welding gun, a vibration sensor connected to the welding table for detecting the vibration intensity of the welding table, and a visual sensor arranged above the welding table for detecting the number of defective welds in the positioning mesh;

[0032] A control module, which is respectively connected to the steel bar processing module, the welding module and the detection module, and is used to determine the preheating time of the welding gun according to the variance of the fluctuation amplitude of the working voltage of the welding gun, or to determine the welding time of a single welding point according to the vibration intensity of the welding table, and to determine the welding current of the positioning mesh according to the vibration intensity of the welding table and the proportion of the number of defective welds in the positioning mesh.

[0033] Specifically, the processing unit includes:

[0034] A steel bar straightening machine, used to straighten the steel bar raw material;

[0035] A steel bar cutting machine is arranged at the output end of the steel bar straightening machine and is used for cutting the straightened steel bars to output shaped steel bars.

[0036] Specifically, the conveying unit includes:

[0037] A conveyor belt, used to convey the shaped steel bars to the welding area;

[0038] A conveying motor is connected to the conveying belt to provide conveying power for the conveying belt.

[0039] Specifically, defective welds in the positioning mesh are welds in the positioning mesh that have pits, irregular shapes, and spatter attached to the surface of the welds.

[0040] In implementation, the device of the present invention is provided with a steel bar processing module, a welding module, a detection module and a control module, and the preheating time of the welding gun is determined according to the variance of the fluctuation amplitude of the working voltage of the welding gun. Since the welding electrode needs to frequently contact the steel bar for discharge welding, as the number of welding increases, the metal on the surface of the electrode will gradually wear, resulting in increased resistance, excessive local heat during welding, and weld quality problems. By reducing the preheating time of the welding gun, the situation of excessive heat in the electrode can be reduced, thereby making the weld more regular. The welding time of a single weld is determined according to the vibration intensity of the welding table. Since during the welding process of the positioning mesh, the positioning mesh is placed on the welding table and vibration is generated, long-term vibration causes the joint of the cable to be damaged. The screws are loose, resulting in poor contact of the welding equipment. By increasing the welding time of a single weld, the welding time of a single weld can be increased to ensure that the weld has enough heat to fully fuse the steel bars, thereby improving the quality and strength of the weld. The welding current of the positioning mesh is determined according to the proportion of the number of defective welds in the positioning mesh. A large amount of dust and metal debris will accumulate on the surface of the welding equipment, which will be drawn into the molten pool during the welding process to form inclusions, resulting in defects in the welds of the positioning mesh. By increasing the welding current of the positioning mesh, the temperature of the molten pool is increased, which helps the inclusions to float, and the metal oxide inclusions react with the metal in the high-temperature molten pool to dissolve, reducing the residual inclusions in the weld, and improving the stability of the positioning mesh welding production.

[0041] Specifically, the control module is used to obtain the working voltage of the welding gun within several welding cycles and calculate the variance of the fluctuation amplitude of the working voltage of the welding gun. If the variance of the fluctuation amplitude of the working voltage of the welding gun is greater than a preset first variance, it is determined that the stability of the positioning mesh welding production does not meet the requirements.

[0042] Specifically, the control module is used to preliminarily determine that the welding reliability of the positioning mesh does not meet the requirements when the variance of the fluctuation amplitude of the working voltage of the welding gun is greater than the preset first variance and less than or equal to the preset second variance, and determine whether the welding reliability of the positioning mesh meets the requirements based on the vibration intensity of the welding table.

[0043] It can be understood that the three intervals corresponding to the preset first variance and the preset second variance correspond to three situations respectively:

[0044] The first interval is when the variance of the fluctuation amplitude of the working voltage of the welding gun is less than or equal to the preset first variance, corresponding to the situation where the stability of the positioning mesh welding production meets the requirements;

[0045] The second interval is when the variance of the fluctuation amplitude of the working voltage of the welding gun is greater than the preset first variance and less than or equal to the preset second variance, corresponding to the situation that during the welding process of the positioning mesh, the positioning mesh is placed on the welding table and vibration is generated. Long-term vibration causes the screws at the joint of the cable to loosen, thereby causing poor contact of the welding equipment.

[0046] The third interval is when the variance of the fluctuation amplitude of the working voltage of the welding gun is greater than the preset second variance. The corresponding welding electrode needs to frequently contact the steel bar for discharge welding. As the number of welding increases, the metal on the surface of the electrode will gradually wear, resulting in increased resistance. During welding, the local heat is too high, resulting in weld quality problems.

[0047] In practice, the range of the preset first variance is generally [4V 2 , 6V 2 ], the preset second variance is generally selected in the range of [7V 2 , 9V 2 ].

[0048] Specifically, the preferred embodiment of the preset first variance is 5V 2 The preferred embodiment of the preset second variance is 8V 2 .

[0049] Specifically, the variance of the fluctuation amplitude of the working voltage of the welding gun is the variance of the fluctuation amplitude of the working voltage of the welding gun within several welding cycles. The calculation method of the variance of the fluctuation amplitude of the working voltage of the welding gun is a conventional technical means well known to those skilled in the art. Therefore, the calculation process of the variance of the fluctuation amplitude of the working voltage of the welding gun will not be repeated here.

[0050] Specifically, the fluctuation range of the working voltage of the welding gun is the difference between the maximum working voltage of the welding gun and the minimum working voltage of the welding gun in a number of welding cycles.

[0051] In implementation, the device described in the present invention determines the stability of the positioning mesh welding production by setting a preset first variance and a preset second variance, thereby reducing the impact of the reduced accuracy of the positioning mesh welding production due to inaccurate determination of the stability of the positioning mesh welding production, and further improving the stability of the positioning mesh welding production.

[0052] Specifically, the control module is used to reduce the preheating time of the welding gun when the variance of the fluctuation amplitude of the working voltage of the welding gun is greater than the preset second variance;

[0053] The reduction range of the preheating time of the welding gun is determined by the difference between the variance of the fluctuation range of the working voltage of the welding gun and a preset second variance.

[0054] Specifically, the difference between the variance of the fluctuation amplitude of the working voltage of the welding gun and the preset second variance is 3V 2 When the difference between the fluctuation amplitude of the working voltage of the welding gun and the preset second variance exceeds 3V, the preheating time of the welding gun is reduced to 0.9 times of the original value. 2 When the voltage exceeds 1V 2 , the preheating time of the welding gun is reduced by 0.5s. For example, the difference between the variance of the fluctuation amplitude of the working voltage of the welding gun and the preset second variance is 5V 2 , the current preheating time of the welding gun is 3s, and the reduced preheating time of the welding gun is 3×0.9-0.5×2=1.7s.

[0055] In implementation, the device described in the present invention determines the preheating time of the welding gun by setting a preset first variance and a preset second variance. Since the welding electrode needs to frequently contact the steel bar for discharge welding, as the number of welding increases, the metal on the surface of the electrode will gradually wear, resulting in increased resistance, and local excessive heat during welding, resulting in weld quality problems. By reducing the preheating time of the welding gun, the situation where the electrode is overheated can be reduced, thereby making the weld more regular, further improving the stability of the positioning mesh welding production.

[0056] Specifically, the control module is used to obtain the vibration intensity of the welding table. If the vibration intensity of the welding table is greater than a preset first vibration intensity, it is determined that the welding reliability of the positioning mesh does not meet the requirements.

[0057] Specifically, the control module is used to preliminarily determine that the environmental stability of the positioning mesh welding does not meet the requirements when the vibration intensity of the welding table is greater than a preset second vibration intensity, and to determine whether the environmental stability of the positioning mesh welding meets the requirements based on the proportion of defective welds in the positioning mesh.

[0058] It can be understood that the three intervals corresponding to the preset first vibration intensity and the preset second vibration intensity correspond to three situations respectively:

[0059] The first interval is when the vibration intensity of the welding table is less than or equal to the preset first vibration intensity, and the welding reliability of the corresponding positioning mesh meets the requirements;

[0060] The second interval is when the vibration intensity of the welding table is greater than the preset first vibration intensity and less than or equal to the preset second vibration intensity. This corresponds to the situation in which during the welding process of the positioning mesh, the positioning mesh is placed on the welding table and vibration is generated. Long-term vibration causes the screws at the cable joint to loosen, thereby causing poor contact of the welding equipment.

[0061] The third interval is when the vibration intensity of the welding table is greater than the preset second vibration intensity. A large amount of dust and metal debris will accumulate on the surface of the corresponding welding equipment, causing them to be drawn into the molten pool during the welding process, forming inclusions, which will cause defects in the weld points of the positioning mesh.

[0062] In practice, the preset first vibration intensity is generally selected in the range of [6m / s 2 , 8m / s 2 ], the preset second vibration intensity is generally selected in the range of [9m / s 2 , 11m / s 2 ].

[0063] Preferably, the preferred embodiment of the preset first vibration intensity is 7m / s 2 The preferred embodiment of the preset second vibration intensity is 10m / s 2 .

[0064] During implementation, the equipment described in the present invention determines the welding reliability of the positioning mesh by setting a preset first vibration intensity and a preset second vibration intensity, thereby reducing the impact of the reduced stability of the positioning mesh welding production due to inaccurate determination of the welding reliability of the positioning mesh, and further improving the stability of the positioning mesh welding production.

[0065] Specifically, the control module is used to increase the welding time of a single welding point when the vibration intensity of the welding table is greater than the preset first vibration intensity and less than or equal to the preset second vibration intensity.

[0066] Specifically, the increase range of the welding time of the single welding point is determined by the difference between the vibration intensity of the welding table and the preset first vibration intensity.

[0067] Specifically, the difference between the vibration intensity of the welding table and the preset first vibration intensity is 2m / s 2 When the difference between the vibration intensity of the welding table and the preset first vibration intensity exceeds 2m / s, the welding time of a single welding point increases to 1.1 times of the original value; when the difference between the vibration intensity of the welding table and the preset first vibration intensity exceeds 2m / s 2 When the speed exceeds 2m / s 2 , the welding time of a single welding point increases by 0.1s. For example, the difference between the vibration intensity of the welding table and the preset first vibration intensity is 6m / s 2The current welding time of a single welding point is 0.3s, and the reduced welding time of a single welding point is 0.3×1.1+0.1×2=0.53s.

[0068] In implementation, the equipment described in the present invention determines the welding time of a single welding point by setting a preset first vibration intensity and a preset second vibration intensity. Since vibration is generated when the positioning mesh is placed on the welding table during the welding process of the positioning mesh, long-term vibration causes the screws at the cable joint to loosen, thereby causing poor contact of the welding equipment. By increasing the welding time of a single welding point, the welding time of a single welding point can be increased, which can ensure that the welding point has enough heat to fully fuse the steel bars, thereby improving the quality and strength of the welding point, and further improving the stability of the positioning mesh welding production.

[0069] Specifically, the control module is used to obtain the number of defective welds in the positioning mesh and the total number of welds in the positioning mesh respectively, and calculate the proportion of the number of defective welds in the positioning mesh. If the proportion of the number of defective welds in the positioning mesh is greater than the preset proportion, it is determined that the environmental stability of the positioning mesh welding does not meet the requirements, and the welding current of the positioning mesh is reduced.

[0070] It can be understood that the two intervals corresponding to the preset proportions correspond to two situations:

[0071] The first interval is when the proportion of defective welds in the positioning mesh is less than or equal to the preset proportion, corresponding to the situation where the environmental stability of the positioning mesh welding meets the requirements;

[0072] The second interval is when the number of defective welds in the positioning mesh accounts for a greater than the preset ratio. A large amount of dust and metal debris will accumulate on the surface of the corresponding welding equipment, causing them to be drawn into the molten pool during the welding process, forming inclusions, which in turn cause defects in the welds of the positioning mesh.

[0073] In practice, the preset ratio is generally selected in the range of [2%, 4%].

[0074] Preferably, the preset proportion is 3%.

[0075] Specifically, the proportion of the number of defective welds in the positioning mesh is the ratio of the number of defective welds in the positioning mesh to the total number of welds in the positioning mesh.

[0076] During implementation, the equipment described in the present invention determines the environmental stability of the positioning mesh welding by setting a preset ratio, thereby reducing the impact of the decreased environmental stability of the positioning mesh welding due to inaccurate determination of the environmental stability of the positioning mesh welding, and further improving the stability of the positioning mesh welding production.

[0077] Specifically, the reduction range of the welding current of the positioning mesh is determined by the difference between the proportion of the number of defective welds in the positioning mesh and a preset proportion.

[0078] Specifically, when the difference between the percentage of defective welds in the positioning mesh and the preset percentage is within 2%, the welding current of the positioning mesh is reduced to 0.95 times the original value; when the difference between the percentage of defective welds in the positioning mesh and the preset percentage exceeds 2%, the welding current of the positioning mesh is reduced by 100A for every 2% increase. For example, the difference between the percentage of defective welds in the positioning mesh and the preset percentage is 6%. The current welding current of the positioning mesh is 6000A, and the reduced welding current of the positioning mesh is 6000×0.95-100×2=5500A.

[0079] In practice, the device described in the present invention determines the welding current of the positioning mesh by setting a preset ratio. Since a large amount of dust and metal debris will accumulate on the surface of the welding equipment, they will be drawn into the molten pool during the welding process to form inclusions, which will cause defects in the welds of the positioning mesh. By increasing the welding current of the positioning mesh, the temperature of the molten pool is increased, which helps the inclusions to float up, and the metal oxide inclusions react with the metal in the high-temperature molten pool to dissolve, thereby reducing the residual inclusions in the welds, and further improving the stability of the positioning mesh welding production.

[0080] 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 prefabricated box girder prestressed positioning mesh welding production equipment, characterized in that: include: A steel bar processing module, comprising a processing unit for processing steel bar raw materials into shaped steel bars and a conveying unit connected to the processing unit for conveying the shaped steel bars to a welding area; A welding module, which is connected to the steel bar processing module, and includes a welding table for providing a welding platform and a welding gun for welding the formed steel bars to output a positioning mesh; A detection module connected to the welding module, comprising a voltage sensor connected to the welding gun for detecting the working voltage of the welding gun, a vibration sensor connected to the welding table for detecting the vibration intensity of the welding table, and a visual sensor arranged above the welding table for detecting the number of defective welds in the positioning mesh; A control module, which is respectively connected to the steel bar processing module, the welding module and the detection module, and is used to determine the preheating time of the welding gun according to the variance of the fluctuation amplitude of the working voltage of the welding gun, or to determine the welding time of a single welding point according to the vibration intensity of the welding table, and to determine the welding current of the positioning mesh according to the vibration intensity of the welding table and the proportion of the number of defective welds in the positioning mesh.

2. The prefabricated box beam prestressed positioning mesh welding production equipment according to claim 1 is characterized in that: The control module is used to determine whether the stability of the positioning mesh welding production meets the requirements based on the variance of the fluctuation amplitude of the working voltage of the welding gun. If the variance of the fluctuation amplitude of the working voltage of the welding gun is greater than a preset first variance, it is determined that the stability of the positioning mesh welding production does not meet the requirements.

3. The prefabricated box beam prestressed positioning mesh welding production equipment according to claim 2 is characterized in that: The control module is used to preliminarily determine that the welding reliability of the positioning mesh does not meet the requirements when the variance of the fluctuation amplitude of the working voltage of the welding gun is greater than the preset first variance and less than or equal to the preset second variance, and determine whether the welding reliability of the positioning mesh meets the requirements based on the vibration intensity of the welding table.

4. The prefabricated box beam prestressed positioning mesh welding production equipment according to claim 3 is characterized in that: The control module is used to reduce the preheating time of the welding gun when the variance of the fluctuation amplitude of the working voltage of the welding gun is greater than the preset second variance; The reduction range of the preheating time of the welding gun is determined by the difference between the variance of the fluctuation range of the working voltage of the welding gun and a preset second variance.

5. The prefabricated box beam prestressed positioning mesh welding production equipment according to claim 3 is characterized in that: The control module is used to determine whether the welding reliability of the positioning mesh meets the requirements according to the vibration intensity of the welding table. If the vibration intensity of the welding table is greater than a preset first vibration intensity, it is determined that the welding reliability of the positioning mesh does not meet the requirements.

6. The prefabricated box beam prestressed positioning mesh welding production equipment according to claim 5 is characterized in that: The control module is used to preliminarily determine that the environmental stability of the positioning mesh welding does not meet the requirements when the vibration intensity of the welding table is greater than the preset second vibration intensity, and determine whether the environmental stability of the positioning mesh welding meets the requirements based on the proportion of the number of defective welds in the positioning mesh.

7. The prefabricated box beam prestressed positioning mesh welding production equipment according to claim 6 is characterized in that: The control module is used to increase the welding time of a single welding point when the vibration intensity of the welding table is greater than the preset first vibration intensity and less than or equal to the preset second vibration intensity.

8. The prefabricated box beam prestressed positioning mesh welding production equipment according to claim 7 is characterized in that: The increase range of the welding time of the single welding point is determined by the difference between the vibration intensity of the welding table and the preset first vibration intensity.

9. The prefabricated box beam prestressed positioning mesh welding production equipment according to claim 6, characterized in that: The control module is used to determine whether the environmental stability of the positioning mesh welding meets the requirements based on the proportion of the number of defective welds in the positioning mesh. If the proportion of the number of defective welds in the positioning mesh is greater than the preset proportion, it is determined that the environmental stability of the positioning mesh welding does not meet the requirements, and the welding current of the positioning mesh is reduced.

10. The prefabricated box beam prestressed positioning mesh welding production equipment according to claim 9, characterized in that: The reduction range of the welding current of the positioning mesh is determined by the difference between the proportion of the number of defective welds in the positioning mesh and a preset proportion.

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