Box body welding equipment based on cable branch box

Abstract

The invention relates to the technical field of welding equipment, in particular to box body welding equipment based on a cable branch box, which comprises a rack, a radiation type liquid cooling heat dissipation structure, a welding execution structure and a central control system. According to the box body welding equipment based on the cable branch box, an efficient and directional heat transfer path is established through the heat conduction design of'central concentrated heat absorption-radiation global heat dissipation 'of a radiation type liquid cooling heat dissipation structure. A shunting micro-channel of the central liquid cooling cavity enables the low-temperature heat-conducting liquid to uniformly cover a welding core area, so that heat is quickly and intensively absorbed; the heat exchange area is enlarged through dense heat dissipation micro-channels of the radial heat distribution cavity, closed-loop liquid flow circulation is matched, absorbed heat is efficiently transmitted to a non-welding area of a workpiece to be diffused, and the heat conduction efficiency is remarkably improved. By means of the directional heat conduction mechanism, local high-temperature gathering in a welding area can be quickly eliminated, overlarge temperature gradients in different areas of a workpiece are avoided, accurate balance of a thermal field is achieved, and thermal deformation inducements are reduced from the source.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, specifically to a welding equipment for cable branch boxes. Background Technology

[0002] As a critical node in power transmission systems, the welding precision and mechanical properties of cable distribution boxes directly affect the stability and safety of power transmission. Currently, most cable distribution box bodies are constructed from multiple sections of weathering steel, such as Q355NH, welded together. Industry standards impose strict requirements on the flatness and diagonal deviation of the welded box, and the welds must possess good mechanical properties and corrosion resistance. Especially in low-temperature environments, they must meet specified impact resistance requirements, which reduces the reliability of the box during service.

[0003] Currently, existing equipment used for welding cable branch box bodies has the following core defects, making it difficult to meet the aforementioned high precision and high performance requirements:

[0004] 1. Insufficient control of welding deformation: Traditional welding equipment relies solely on symmetrical welding processes or simple mechanical clamping devices, failing to actively regulate the thermal stress generated by heat input during welding. In thick plate welding scenarios, the difference in thermal expansion and contraction caused by localized high temperatures in the welding area cannot be eliminated, easily leading to deformation problems such as warping and misalignment. This necessitates additional straightening procedures, which not only reduces production efficiency but may also damage the structural strength of the enclosure.

[0005] 2. Uneven heat distribution: During welding, the heat input from the electric arc is concentrated in the welding area, forming localized high-temperature zones. Heat cannot quickly diffuse to the surrounding area, easily leading to coarse grains in the weld area, which in turn affects the mechanical properties of the joint. Especially in low-temperature environments, the impact energy of the weld is difficult to meet industry requirements, reducing the service reliability of the enclosure.

[0006] 3. Lack of ability to cope with heat dissipation failure: Although some existing equipment is equipped with simple heat dissipation structures, most of them are passive heat dissipation modes. When the gap between the heat dissipation structure and the workpiece is abnormal, resulting in heat dissipation failure, it is impossible to make adaptive adjustments, which further aggravates the problems of uneven thermal field and welding deformation.

[0007] Therefore, there is an urgent need to design a welding equipment that can actively regulate the heat distribution in the welding area, achieve thermal field balance, and has adaptive heat dissipation regulation capabilities, so as to suppress welding deformation from the source, improve the welding quality and production efficiency of cable branch box bodies, and meet the industry's high precision and high performance requirements. Summary of the Invention

[0008] The purpose of this invention is to provide a welding device for cable branch boxes, addressing the problems of insufficient welding deformation control, uneven heat distribution, and lack of ability to handle heat dissipation failures mentioned in the background art. To achieve the above objective, this invention provides the following technical solution: a welding device for cable branch boxes, comprising a frame, a radial liquid cooling structure, a welding execution structure, and a central control system;

[0009] The radial liquid cooling structure is fitted onto the non-welding side of the workpiece welding area, and its core function is to achieve concentrated heat absorption and full-area radiative heat dissipation in the welding area.

[0010] The welding execution structure is slidably connected to the top of the frame via a gantry frame and is used to complete welding operations;

[0011] The central control system is electrically connected to the radiative liquid cooling heat dissipation structure and the welding execution structure respectively, so as to realize the coordinated control of each structure.

[0012] The top of the frame is equipped with a support platform and a clamping device for fixing the cable branch box body plate to be welded.

[0013] Radial liquid cooling structure: Using a highly thermally conductive liquid as the medium, the heat from the welding area is concentrated and absorbed on the non-welding side of the workpiece through the central liquid cooling cavity, and then diffused evenly to the surrounding non-welding areas of the non-welding side of the workpiece through the radial heat distribution cavity, so as to achieve active balance control of the thermal field and solve the defect of uneven thermal field distribution in existing equipment.

[0014] The integrated double-pipe circulation connection pipe, formed by the sealing connection of the middle rigid metal pipe and the two flexible corrugated pipes at both ends, ensures the stability of the liquid flow circulation. The heat deformation airbag realizes the adaptive control of the liquid flow when heat dissipation fails (when the abnormal gap between the radial heat distribution cavity and the workpiece causes heat dissipation to be blocked, the heat deformation airbag expands with the temperature rise, adjusts the flow cross section of the liquid outlet pipe, and guides the heat transfer liquid to the well-fitted heat distribution cavity to avoid local heat accumulation), which solves the problem of the lack of heat dissipation failure response capability of the existing equipment.

[0015] Miniature pressure sensors collect real-time inlet pressure data from each dual-pipe circulation connection pipe, providing a basis for the central control system to adjust the output power of the circulation pump set and ensure balanced liquid flow in each branch pipe, ultimately suppressing thermal deformation at its source and ensuring welding precision. It should be noted that the circulation pump set is not installed on the dual-pipe circulation connection pipe for the following reasons: 1. The dual-pipe circulation connection pipe is a "center-radial" branch pipe, with multiple sets evenly distributed along the circumference of the central liquid cooling cavity. If the pump set is installed on a single branch pipe, it will lead to uneven liquid flow pressure in each branch pipe, preventing uniform heat diffusion and disrupting the thermal field balance effect.

[0016] 2. The two ends of the double-pipe circulation connection pipeline are flexible corrugated pipes, which need to be adapted to the slight displacement of the central liquid cooling cavity and the radial heat distribution cavity. The pump set has a certain weight and volume. If it is installed on the branch pipeline connected by the flexible corrugated pipe, it will cause the pipeline to be unbalanced and easily cause the flexible corrugated pipe to break and the seal to fail.

[0017] 3. The circulating pump unit needs to provide stable power for the entire closed-loop system. It is integrated into the outer wall of the central liquid cooling cavity (moving synchronously with the central liquid cooling cavity) and directly connected in series with the central liquid cooling cavity. This allows the heat transfer fluid to first be collected in the central liquid cooling cavity and then evenly distributed to each branch pipeline, ensuring consistent fluid pressure in each dual-pipe circulating connection pipeline, while avoiding pulling damage to the branch pipelines by the pump unit. In addition, the matching infrared temperature measurement probe adopts a design of "uniformly arranged on the outer wall of the radial heat distribution cavity and facing the workpiece," which can avoid interference from welding arc light and accurately collect temperature data of different areas of the workpiece, providing a reliable basis for the central control system to regulate the thermal field balance.

[0018] Central liquid cooling cavity: Internally integrated with inlet collection tank and diversion microchannel. The inlet collection tank is a groove-shaped structure at the liquid inlet end of the central liquid cooling cavity, used to receive the low-temperature heat transfer fluid transported by the circulating pump group.

[0019] The diversion microchannels extend circumferentially or radially along the inlet manifold, evenly distributed within the central liquid cooling cavity and facing the top elastic sealing gasket. This allows for the uniform distribution of the low-temperature heat transfer fluid to all areas of the central liquid cooling cavity, ensuring uniform and rapid heat absorption in the welding area and preventing thermal imbalance caused by insufficient localized heat absorption. The central liquid cooling cavity is CNC machined from stainless steel, and the top elastic sealing gasket is made of fluororubber, possessing excellent high-temperature resistance and sealing properties, allowing it to tightly adhere to the workpiece surface and reduce heat loss.

[0020] Radial heat distribution chambers: These are evenly arranged around the central liquid cooling chamber, with the number adjusted to fit the workpiece size. The angle between adjacent heat distribution chambers is equal to ensure uniform heat diffusion. The heat distribution chambers integrate a manifold, heat dissipation microchannels, and an outlet collection channel. The manifold receives the high-temperature heat transfer fluid from the inlet pipe and distributes it to the heat dissipation microchannels. The heat dissipation microchannels employ a dense fin structure to increase the contact area between the heat transfer fluid and the heat distribution chamber wall, thereby improving heat dissipation efficiency.

[0021] The liquid outlet collection tank collects the low-temperature heat-conducting liquid flowing out of the heat dissipation microchannels and guides it to the outlet pipe, completing the heat exchange cycle. The heat distribution chamber is also made of stainless steel, and the top elastic sealing gasket is consistent with the central liquid cooling chamber to ensure a tight seal.

[0022] Dual-pipe circulation connection pipeline: It consists of an inlet pipe and an outlet pipe. The liquid flow direction of the inlet pipe is from the central liquid cooling cavity to the radial heat distribution cavity. It is used to transport the high-temperature heat transfer liquid after the central liquid cooling cavity absorbs heat to the radial heat distribution cavity.

[0023] The liquid flow direction of the outlet pipe is from the radial heat distribution chamber to the central liquid cooling chamber, which is used to transport the low-temperature heat transfer fluid after the heat distribution chamber has dissipated heat back to the central liquid cooling chamber. The two work together to form a closed loop circulation. The pipeline adopts an integrated double-pipe structure formed by sealing the middle rigid metal pipe and the two flexible corrugated pipes at both ends. The rigid metal pipe ensures the overall rigidity of the pipeline.

[0024] The flexible corrugated pipe has excellent axial and radial expansion and contraction capabilities, which can accommodate slight displacements of the central liquid cooling cavity and the radial heat distribution cavity, preventing pipe damage from pulling. The connection points are sealed by welding to ensure no leakage.

[0025] Elastic pressure plate: As an auxiliary bonding structure, it adopts a spring steel arc design, evenly arranged circumferentially along the edges of the central liquid-cooled cavity and the radial heat distribution cavity. One end is fixed to the outer wall of the cavity, and the other end contacts the support surface of the frame. It only assists in driving the sealing gasket layer to bond with the workpiece through pre-tightening elasticity, and adapts to the slight displacement of the cavity to ensure the basic stability of the heat transfer interface. It does not directly participate in the core processes of heat conduction and thermal field control.

[0026] Heat-deformable airbags and miniature pressure sensors: The heat-deformable airbags are fixed within the rigid sections of the outlet pipes corresponding to each radial heat-dissipating cavity. Made of fluororubber, they possess excellent high-temperature resistance and have pre-reserved expansion space with the inner wall of the outlet pipe. When the gap between the radial heat-dissipating cavity and the workpiece is abnormal (e.g., loosening), causing heat dissipation obstruction, the temperature of the heat-conducting fluid in the heat-dissipating cavity rises. The heat-deformable airbags expand with the temperature increase, reducing the flow cross-section of the outlet pipe and generating flow resistance. This reduces the flow rate of the branch pipe and guides the heat-conducting fluid to the well-fitted, normally heat-dissipating heat-dissipating cavity, avoiding localized heat accumulation.

[0027] Once the sealing gap returns to normal, the temperature decreases, the airbag contracts, the flow cross-section recovers, the fluid flow resistance disappears, and the fluid flow rate returns to equilibrium. Miniature pressure sensors are connected in series at the inlet end of the rigid section of the inlet pipe of each dual-pipe circulation connection. These sensors can collect real-time inlet pressure data from each branch pipe caused by changes in airbag resistance and transmit it to the central control system. The system accurately determines whether the fluid flow in each pipe is balanced and the airbag control status based on the pressure data, thereby adjusting the output power of the circulation pump group to ensure the fluid flow stability of the entire circulation system, forming a closed-loop collaborative mechanism of "airbag resistance control - sensor pressure feedback - precise system control".

[0028] Infrared temperature probe: Utilizing high-precision infrared temperature sensors, these sensors are evenly distributed on the outer wall of the radial heating chamber, facing the workpiece. This arrangement avoids direct interference from the welding arc, accurately collecting surface temperature data from different areas of the workpiece. After the data is transmitted to the central control system, the system combines this data with the temperature distribution to determine the uniformity of the thermal field. If localized high-temperature zones exist, [further action can be taken].

[0029] Welding execution structure: The CO2 gas shielded welding structure includes a welding torch, wire feeding mechanism, and gas shielding unit, and is equipped with an arc sensing unit electrically connected to the central control system. CO2 gas shielded welding has advantages such as high welding efficiency, good weld formation, and strong crack resistance.

[0030] The wire feeding mechanism is driven by a servo motor, and the wire feeding speed is adjustable, allowing for precise matching of the wire feeding amount according to the welding thickness and welding speed.

[0031] The gas protection unit outputs high-purity carbon dioxide protective gas with adjustable flow rate, which can effectively isolate air, prevent weld oxidation, and improve weld quality.

[0032] The arc sensing unit can detect changes in arc voltage and current in real time, determine the distance between the welding torch and the workpiece, and the deviation in weld position. After the data is transmitted to the central control system, the system automatically adjusts the position and posture of the welding torch to ensure accurate welding trajectory and reduce uneven heat input caused by welding deviation. The welding torch is connected to the gantry via a robotic arm. The gantry uses ball screw drive, which has high motion accuracy and can achieve precise movement in the X, Y, and Z directions, adapting to welding operations of different sized boxes.

[0033] The frame serves as the load-bearing foundation of the entire equipment. Its top support platform provides a stable placement platform for the workpieces to be welded. The accompanying clamping device can firmly fix the cable branch box body plates to be welded through rigid clamping, preventing welding deviations or disordered heat field distribution due to workpiece displacement during welding. The central control system, as the core control hub of the equipment, establishes an electrical connection with the radiative liquid cooling structure and welding execution structure through a preset control program, achieving coordinated operation between these structures. Specifically, the central control system can receive pressure signals from the miniature pressure sensor in the radiative liquid cooling structure and temperature signals from the infrared temperature probe, while simultaneously sending start / stop and power adjustment signals to the circulating pump group.

[0034] For the welding execution structure, the central control system can receive the deviation signal from the arc sensing unit and send action commands to the welding torch, wire feeding mechanism and gas protection unit to ensure that the welding operation and thermal field control are carried out synchronously, forming a closed-loop control system.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0036] 1. Enhanced Heat Transfer Efficiency and Precise Thermal Equilibrium: Through a radiative liquid cooling structure with a "centralized heat absorption - radiative global heat dissipation" heat transfer design, a highly efficient and directional heat transfer path is established. The microchannels in the central liquid cooling cavity ensure that the low-temperature heat-conducting liquid evenly covers the core welding area, achieving rapid and concentrated heat absorption. The dense heat dissipation microchannels in the radiative heat distribution cavity expand the heat exchange area, and combined with closed-loop liquid circulation, efficiently transfer the absorbed heat to the non-welding areas of the workpiece, significantly improving heat transfer efficiency. This directional heat transfer mechanism can quickly eliminate localized high-temperature accumulation in the welding area, avoid excessive temperature gradients in different areas of the workpiece, achieve precise thermal equilibrium, and reduce the causes of thermal deformation at their source.

[0037] 2. Temperature-driven airbag resistance regulation and sensor feedback work together to improve the accuracy of thermal field control: The thermodeformable airbag generates fluid flow resistance based on its temperature difference response characteristics, achieving adaptive initial control of heat dissipation failure; the miniature pressure sensor accurately captures fluid flow pressure fluctuations caused by changes in airbag resistance, forming a feedback signal. The two work together to form a dual guarantee of "passive resistance regulation + active pressure feedback": When the abnormal gap between the radial heat dissipation chambers obstructs heat dissipation, the temperature of the heat transfer fluid rises, driving the airbag to expand and generate resistance, actively reducing the fluid flow in that branch and avoiding local heat accumulation; at the same time, the pressure sensor transmits the pressure change data corresponding to the resistance to the central control system in real time. The system can accurately determine the location of the abnormal branch and the effect of airbag regulation. If the thermal field is still uneven after the initial airbag regulation, the output power of the circulating pump group or the fluid flow status of other branches can be further actively adjusted to achieve the transition from "passive self-adaptation" to "active precise regulation". This collaborative mechanism requires no additional power, which not only improves the response speed to heat dissipation anomalies, but also ensures the control accuracy through pressure feedback, avoids the deviation that may exist in the control of a single airbag, ensures the stability of the overall thermal field balance, and further improves the consistency of welding quality.

[0038] 3. Ensuring the stability of the core mechanism: The "rigid section + flexible corrugated pipe" design of the dual-pipe circulation connection pipe ensures the rigidity of the heat transfer fluid circulation structure and adapts to small displacements of the cavity, avoiding pipe damage from affecting the continuity of heat conduction. This provides structural protection for the stable operation of the core heat conduction mechanism and the coordinated regulation of the airbag and sensor.

[0039] 4. Enhanced heat deformation suppression and reduced subsequent processing costs: Efficient directional heat conduction reduces the time the workpiece remains at localized high temperatures, preventing coarse grains in the weld area; temperature difference-driven adaptive thermal field control further reduces the overall temperature difference of the workpiece, significantly reducing internal stress caused by uneven thermal expansion and contraction, and fundamentally suppressing welding deformations such as warping and misalignment. Effective control of heat deformation can directly reduce subsequent straightening processes, lower production energy consumption and processing costs, while ensuring workpiece dimensional accuracy and improving product qualification rate. Attached Figure Description

[0040] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0041] Figure 2 This is a schematic diagram showing the distribution of the central liquid cooling cavity and the radial heat distribution cavity in this invention;

[0042] Figure 3 This is a schematic diagram of the central liquid cooling cavity, radial heat distribution cavity, and dual-pipe circulation connection pipeline of the present invention.

[0043] Figure 4 This is a three-dimensional structural cross-sectional view of the inlet pipe, outlet pipe, and heat-deformable airbag of the present invention.

[0044] Figure 5 This is a three-dimensional structural diagram of the central liquid cooling chamber and circulating pump assembly of the present invention;

[0045] Figure 6 This is a three-dimensional cross-sectional view of the radial heat distribution cavity of the present invention;

[0046] Figure 7 This is a three-dimensional structural cross-sectional view of the central liquid cooling cavity of the present invention;

[0047] Figure 8 This is a schematic diagram of the structure of the inlet collection channel and the diversion microchannel of the present invention.

[0048] In the diagram: 1. Rack; 2. Radiant liquid cooling structure; 3. Welding execution structure; 4. Central control system; 5. Gantry;

[0049] 2. Radiative liquid cooling structure: 21. Central liquid cooling cavity; 22. Radiating heat dissipation cavity; 23. Dual-pipe circulation connection pipeline; 24. Circulation pump group; 25. Elastic pressure plate; 26. Elastic sealing gasket; 27. Miniature pressure sensor; 28. Thermally deformable airbag;

[0050] 21. Central liquid cooling cavity: 211. Inlet manifold; 212. Diversion microchannel;

[0051] 22. Radial heat distribution cavity; 221. Manifold; 222. Heat dissipation microchannel; 223. Liquid outlet collection channel;

[0052] 23. Dual-pipe circulation connection pipeline: 231. Inlet pipe; 232. Outlet pipe. Detailed Implementation

[0053] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] Please see Figures 1 to 8 This invention provides a technical solution: a welding equipment for cable branch boxes, wherein a frame 1 serves as a load-bearing foundation, a support platform is installed on its top, and pressing devices are evenly arranged along the edge of the support platform. The pressing devices are connected to a pneumatic control system, which is electrically connected to a central control system 4. A radial liquid cooling structure 2 is fitted onto the non-welding side of the workpiece welding area, wherein a central liquid cooling cavity 21 is fitted onto the back of the welding area on the non-welding side of the workpiece, and radial heat dissipation cavities 22 are evenly arranged around the central liquid cooling cavity 21 and fitted onto the back of the non-welding area on the non-welding side of the workpiece. An elastic sealing gasket 26 is installed on the top of both the central liquid cooling cavity 21 and the radial heat dissipation cavities 22. A welding execution structure 3 is slidably connected to the top of the frame 1 via a gantry frame 5, and the welding torch is aimed at the welding side of the workpiece. The central control system 4 is electrically connected to the radial liquid cooling structure 2 and the welding execution structure 3 respectively.

[0055] The radial liquid cooling structure 2 internally connects the central liquid cooling cavity 21 to each radial heat distribution cavity 22 via a dual-pipe circulation connection pipe 23. The dual-pipe circulation connection pipe 23 is an integrated dual-pipe structure formed by a rigid metal pipe in the middle and flexible corrugated pipes at both ends. Each set of pipes consists of an inlet pipe 231 and an outlet pipe 232. After welding and sealing, a penetration test confirms that there is no leakage. The liquid flow direction of the inlet pipe 231 is from the central liquid cooling cavity 21 to the radial heat distribution cavity 22, and the liquid flow direction of the outlet pipe 232 is from the radial heat distribution cavity 22 to the central liquid cooling cavity 21. The central liquid cooling chamber 21 is connected in series with the circulating pump group 24 to form a closed-loop circulation system, and is integrated into the outer wall of the central liquid cooling chamber 21. The inlet end of the rigid section of the liquid inlet pipe 231 of each double-pipe circulation connection pipe 23 is equipped with a miniature pressure sensor 27, which is electrically connected to the central control system 4. The rigid section of the liquid outlet pipe 232 corresponding to each radial heat distribution chamber 22 is fixed with a heat deformable airbag 28, which is made of high temperature resistant elastic material and has a reserved expansion space with the inner wall of the liquid outlet pipe 232.

[0056] A groove-shaped inlet collector 211 is machined at the liquid inlet end inside the central liquid cooling cavity 21. A diversion microchannel 212 extends circumferentially or radially along the inlet collector 211 and is evenly distributed inside the central liquid cooling cavity 21 and faces the top elastic sealing gasket 26. A confluence 221, a heat dissipation microchannel 222, and an outlet collector 223 are machined inside the radial heat distribution cavity 22. The confluence 221 receives the high-temperature heat transfer liquid transported by the liquid inlet pipe 231 and distributes it to the heat dissipation microchannel 222. The outlet collector 223 collects the low-temperature heat transfer liquid flowing out of the heat dissipation microchannel 222 and guides it to the outlet pipe 232.

[0057] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, the elastic pressure plates 25 are fixed to the outer walls of the central liquid cooling cavity 21 and the radial heat distribution cavity 22 respectively. The elastic pressure plates 25 have an arc-shaped structure and are evenly arranged around the edge of the central liquid cooling cavity 21 and around the edge of each radial heat distribution cavity 22. The welding execution structure 3 is a carbon dioxide gas shielded welding structure, including a welding torch, a wire feeding mechanism, a gas protection unit and an arc sensing unit. The arc sensing unit is electrically connected to the central control system 4.

[0058] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, the heat-deformable airbag 28 is made of fluororubber, which has excellent high-temperature resistance and can work stably in the temperature range of -20℃ to 200℃. It also has good elastic recovery and can accurately respond to the temperature change of the heat transfer fluid to expand and contract, ensuring reliable adjustment of the flow cross section of the outlet pipe 232 when heat dissipation is obstructed.

[0059] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, the infrared temperature probes equipped with the radiative liquid cooling structure 2 are evenly arranged on the outer walls of each radiative heat distribution cavity 22, with their detection ends facing the workpiece. The detection range covers the entire non-welded area of ​​the workpiece, and can collect temperature data of different areas of the workpiece in real time. The data is synchronously transmitted to the central control system 4 via signal lines, forming a dual-parameter feedback with the pressure data collected by the miniature pressure sensor 27, providing data support for the central control system 4 to accurately judge the thermal field distribution state.

[0060] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, in the CO2 gas shielded welding structure adopted by the welding execution structure 3, the wire feeding mechanism is driven by a servo motor, and the wire feeding speed is adjustable. The wire feeding amount can be accurately matched by the central control system 4 according to parameters such as welding thickness and welding speed. The CO2 shielding gas output by the gas protection unit has high purity and adjustable flow rate. The gas is supplied in advance before welding starts and the gas is delayed after welding ends, effectively isolating the air and avoiding weld oxidation. The arc sensing unit has high detection accuracy and detects changes in arc voltage and current in real time to determine the distance between the welding torch and the workpiece and the weld position deviation. After the deviation data is transmitted to the central control system 4, the system automatically adjusts the position and posture of the welding torch by driving the moving mechanism of the gantry 5 and the posture adjustment mechanism of the welding execution structure 3 to ensure accurate welding trajectory.

[0061] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, the support platform at the top of the frame 1 is made of cast iron and has a small flatness error after precision grinding, providing a stable foundation for placing the workpiece. The matching clamping devices are evenly distributed along the edge of the support platform and are pneumatically driven. The clamping force is adjustable, and each clamping device can be independently controlled to start and stop through the central control system 4. After the workpiece is placed in place, the central control system 4 can automatically control the corresponding clamping device to start according to the workpiece specifications, ensuring that the workpiece is firmly fixed and without excessive squeezing damage.

[0062] A welding device for cable branch box enclosures includes the following steps:

[0063] S1. Start-up phase: After the central control system 4 sets the parameters, it synchronously starts the radiant liquid cooling structure 2 and the welding execution structure 3. The circulating pump group 24 starts to stabilize the circulation of the heat transfer liquid, and the gas protection unit sends gas in advance.

[0064] S2, Welding and Control Synchronization Stage: The welding torch performs welding according to the preset trajectory, and the radial liquid cooling structure 2 circulates heat dissipation according to the set path. The specific operation process is as follows: the circulating pump group 24 drives the heat transfer fluid to flow out from the central liquid cooling chamber 21, enter each radial heat distribution chamber 22 through the liquid inlet pipe 231, absorb the heat conducted by the workpiece in the radial heat distribution chamber 22, and then flow back to the central liquid cooling chamber 21 through the liquid outlet pipe 232, forming a closed-loop heat dissipation cycle; simultaneously, the miniature pressure sensor 27 collects the liquid flow pressure data of each liquid inlet pipe 231 in real time, and the data is synchronously transmitted to the central control system 4; if a certain radial heat distribution chamber 231 is not properly controlled, the heat transfer fluid will be transferred to the central control system 4. An abnormal gap between the hot cavity 22 and the workpiece obstructs heat dissipation, causing the temperature of the heat transfer fluid in the corresponding area to rise. This triggers the thermal deformation airbag 28 in the outlet pipe 232 of the heat distribution cavity to expand due to heat, reducing the flow cross-section of the outlet pipe 232 and automatically guiding the heat transfer fluid to the heat distribution cavity 22 where heat dissipation is normal. The central control system 4 accurately judges the thermal field distribution state based on the received pressure data feedback and dynamically adjusts the output power of the circulating pump group 24 to ensure the overall fluid circulation is stable and the thermal field is balanced. At the same time, the arc sensing unit detects the weld position deviation and feeds it back to the central control system 4. The system automatically adjusts the welding torch posture to correct the trajectory.

[0065] S3. Finishing stage: After welding is completed, shut down the welding execution structure 3, keep the radiant liquid cooling heat dissipation structure 2 working until the workpiece temperature reaches the standard, shut down the circulation pump group 24, loosen the clamping device and take out the workpiece.

[0066] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A welding device for cable branch box enclosures, characterized in that, It includes a frame (1), a radiative liquid cooling heat dissipation structure (2), a welding execution structure (3), and a central control system (4). The radiative liquid cooling heat dissipation structure (2) is fitted to the non-welding side of the workpiece welding area, and the welding execution structure (3) is slidably connected to the frame (1) above the gantry frame (5). The central control system (4) is electrically connected to the radiative liquid cooling heat dissipation structure (2) and the welding execution structure (3) respectively. The radial liquid cooling heat dissipation structure (2) includes a central liquid cooling cavity (21), a radial heat distribution cavity (22), a dual-pipe circulation connection pipe (23), a circulation pump group (24), an elastic pressure plate (25), and an elastic sealing gasket layer (26). The central liquid cooling cavity (21) is attached to the back of the welding area on the non-welding side of the workpiece, and an elastic sealing gasket (26) is provided on the top. The radial heat distribution cavity (22) is evenly arranged around the central liquid cooling cavity (21) and fits against the back of the non-welding area on the non-welding side of the workpiece. An elastic sealing gasket (26) is also provided on the top. The dual-pipe circulation connection pipe (23) connects the central liquid cooling cavity (21) and each radial heat distribution cavity (22). It adopts an integrated dual-pipe structure formed by sealing the middle rigid metal pipe and the two ends flexible corrugated pipes. Each set of dual-pipe circulation connection pipes (23) consists of an inlet pipe (231) and an outlet pipe (232). The liquid flow direction of the inlet pipe (231) is from the central liquid cooling cavity (21) to the radial heat distribution cavity (22), and the liquid flow direction of the outlet pipe (232) is from the radial heat distribution cavity (22) to the central liquid cooling cavity (21). The elastic pressure plate (25) is fixed to the outer wall of the central liquid cooling cavity (21) and the radial heat distribution cavity (22), respectively. The cavity can be freely placed along the support surface of the frame (1) along with the elastic pressure plate (25). The circulating pump group (24) is connected in series with the central liquid cooling chamber (21) to form a closed-loop circulation system, and is integrated on the outer wall of the central liquid cooling chamber (21); A miniature pressure sensor (27) is connected in series at the inlet end of the hard section of the liquid inlet pipe (231) of each double-pipe circulation connection pipe (23). The miniature pressure sensor (27) is electrically connected to the central control system (4). Each radial heat distribution cavity (22) has a heat-deformable airbag (28) fixed in the rigid section of the liquid outlet pipe (232). The heat-deformable airbag (28) is made of high-temperature resistant elastic material and has a reserved expansion space with the inner wall of the liquid outlet pipe (232).

2. The welding equipment for cable branch boxes according to claim 1, characterized in that: The central liquid cooling cavity (21) integrates an inlet collecting groove (211) and a diversion microchannel (212). The inlet collecting groove (211) is a groove-shaped structure at the liquid inlet end of the central liquid cooling cavity (21). The diversion microchannel (212) extends circumferentially or radially along the inlet collecting groove (211), is evenly distributed inside the central liquid cooling cavity (21) and faces the top elastic sealing pad (26).

3. The welding equipment for cable branch boxes according to claim 1, characterized in that: The radial heat distribution cavity (22) integrates a manifold (221), a heat dissipation microchannel (222), and an outlet collection trough (223). The manifold (221) receives the high-temperature heat-conducting liquid transported by the inlet pipe (231) and distributes it to the heat dissipation microchannel (222). The outlet collection trough (223) collects the low-temperature heat-conducting liquid flowing out of the heat dissipation microchannel (222) and guides it to the outlet pipe (232).

4. The welding equipment for cable branch boxes according to claim 1, characterized in that: The elastic pressure plate (25) has an arc-shaped structure and is evenly arranged around the edge of the central liquid cooling cavity (21) and around the edge of each radial heat distribution cavity (22).

5. The welding equipment for cable branch boxes according to claim 1, characterized in that: The heat-deformable airbag (28) is made of fluororubber, which is a high-temperature resistant elastic material.

6. The welding equipment for cable branch boxes according to claim 1, characterized in that: The radiative liquid cooling structure (2) is equipped with an infrared temperature probe. The infrared temperature probe is evenly arranged on the outer wall of the radiative heat dissipation cavity (22) and faces the workpiece direction, and is electrically connected to the central control system (4).

7. The welding equipment for cable branch boxes according to claim 1, characterized in that: The welding execution structure (3) is a carbon dioxide gas shielded welding structure, including a welding torch, a wire feeding mechanism and a gas protection unit, and is equipped with an arc sensing unit, which is electrically connected to the central control system (4).

8. The welding equipment for cable branch boxes according to claim 1, characterized in that: The top of the frame (1) is provided with a support platform and a clamping device for fixing the cable branch box body plate to be welded.

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