Tube bundle type container frame manufacturing and welding device

Abstract

This invention relates to the field of welding technology for tubular container frames, and more particularly to a welding apparatus for manufacturing tubular container frames, comprising: a welding mechanism including a welding head, a gas storage unit for storing shielding gas, and a plurality of nozzles; a detection mechanism for acquiring an air thermal image of the arc distribution space and airflow velocity at several locations in the welding area; and a control mechanism for determining a pre-injection area, estimating the air separation direction of the shielding gas based on the relative proportion of the width of the shielding gas tip to the angle range of the shielding gas entry, and then determining the injection quantity and injection speed of the shielding gas, and determining an injection strategy for the number of nozzles for injecting the shielding gas based on the number and location of weak areas in the air separation direction. This invention further prevents oxidation reaction between the solder and air in the welding area by adjusting the shielding gas injection area.

Description

Technical Field

[0001] This invention relates to the field of welding technology for tubular container frames, and more particularly to a welding apparatus for manufacturing tubular container frames. Background Technology

[0002] In modern welding technology, the core function of shielding gas is to isolate the welding area from the air, preventing oxidation reactions between the base metal and the solder at high temperatures, thereby ensuring the mechanical properties and airtightness of the weld. Traditional shielding gas control systems typically employ fixed flow or segmented flow control strategies. Furthermore, traditional systems do not monitor the actual coverage area of ​​the shielding gas in real time. When the flow rate of the arc-heated air increases, the shielding gas is easily compressed, leading to oxidation in the welding area. Existing technologies lack real-time analysis of the flow field between the arc-heated air and the shielding gas, making it impossible to quickly identify changes in the air separation direction.

[0003] In the prior art, Chinese Patent Publication No. CN119927529A discloses a welding device and welding method for a steel structure frame, including a base plate with two movable welding mechanisms on the base plate and two control seats located between the two movable welding mechanisms. Each control seat has two movable seats, and two rotating plates and two bearing plates are located on opposite surfaces of the two movable seats. The bearing plates are located below the rotating plates. Both the control seats and the movable seats are hollow. A screw is rotatably connected to the bottom wall of the control seat, and a control mechanism is mounted on the screw. The outer surface of the screw is threaded. The sleeve, with an L-shaped rod fixedly connected to its outer surface, allows the multi-axis welding robot to automatically flip the steel frame after welding one side, minimizing the time required for welding and further ensuring efficiency and speed. However, the aforementioned welding device and method for steel frames suffer from a problem where the protective gas coverage area decreases due to the compression of the hot air from the electric arc when it is injected into the welding area, leading to oxidation of some of the metal parts in contact with air. Summary of the Invention

[0004] To address this issue, the present invention provides a welding apparatus for manufacturing tubular container frames, which overcomes the problem in the prior art where, due to the compression of the arc-heated air when the protective gas is injected into the area to be welded, the coverage area of ​​the metal parts to be welded in the welding area by the protective gas is reduced, resulting in some of the metal parts to be welded coming into contact with air and undergoing an oxidation reaction.

[0005] To achieve the above objectives, the present invention provides a welding apparatus for fabricating tubular container frames, comprising:

[0006] A welding mechanism for welding and fixing metal parts to be welded on a tubular container frame, including a welding head for converting solid solder into molten solder, a gas storage unit for storing protective gas, and several nozzles connected to the gas storage unit for releasing protective gas to the welding area.

[0007] The detection mechanism, which is connected to the welding mechanism, is used to acquire the air thermal image of the arc distribution space and the air velocity at several sampling positions above the welding area.

[0008] A control mechanism, connected to both the welding mechanism and the detection mechanism, is used to determine the air compression zone around the welding head based on the air thermal image; determine the pre-injection zone of the protective gas based on the air compression zone; estimate the air separation direction of the protective gas based on the relative proportion determined by the width of the protective gas tip and the length of the straight lines at both ends of the arc corresponding to the angle range of the protective gas entering the welding area; determine the injection volume and injection velocity of the protective gas based on the air separation direction; and determine the number of nozzles to be opened based on the number and location of weak areas in the air separation zone included in the dispersed air separation direction.

[0009] The air separation direction includes centralized and decentralized types.

[0010] Furthermore, the testing institution includes:

[0011] A thermocouple array, which collects the temperature at several corresponding heat sampling points to form an air thermal image of the arc distribution space;

[0012] An ultrasonic anemometer array is used to obtain the airflow velocity at several locations in the welding area.

[0013] Furthermore, the temperature of all heat sampling points within the arc distribution space is greater than the preset temperature. The largest spatial area enclosed by all heat sampling points, including the arc space, that satisfy the condition of having a temperature greater than the preset temperature is defined as the air compression area around the welding head.

[0014] Furthermore, the horizontal plane where the metal part to be welded is located is taken as the first plane, and the horizontal plane where the nozzle with the largest vertical height on the plane perpendicular to the metal part to be welded is located is taken as the second plane. The area surrounded by the first plane, the second plane, and the edge of the air compression area is defined as the pre-injection area of ​​the protective gas.

[0015] Furthermore, based on the ultrasonic anemometer array detecting the width of the protective gas tip within a first preset time when the protective gas enters the pre-injection area, the preset relative proportion is the ratio of the width of the protective gas tip to the length of the straight lines at both ends of the arc corresponding to the angle range of the protective gas entry.

[0016] Furthermore, when the relative proportion is greater than or equal to a preset relative proportion, the air separation direction is determined to be dispersed.

[0017] If the air separation direction is dispersed, the weak area where the temperature exceeds the standard temperature of the protective gas by a preset amount and the residence time around the protective gas is greater than or equal to the preset residence time is divided into a first weak area and a second weak area. The area above the tip of the protective gas is the first weak area, and the area around the tip of the protective gas, excluding the area above it, is the second weak area.

[0018] Furthermore, based on the existence of a first weak region above the tip of the protective gas, whose direction is opposite to the injection direction of the protective gas, the injection volume of the protective gas is increased; if a second weak region exists, the number and position of the second weak sub-regions within the second weak region are obtained, the corresponding number of nozzles opened is adjusted according to the number of projection points of the second weak sub-regions on the plane perpendicular to the injection direction, and the injection angle and injection volume of each nozzle are adjusted according to the number of the second weak sub-regions closest to the plane perpendicular to the injection direction.

[0019] Furthermore, based on the temperature boundary surface surrounding the protective gas, several second weak sub-regions are identified from the second weak region. The positions of the several nozzles are adjusted to be above each of the second weak sub-regions, and the injection strategy of the nozzles at this time is to adjust the injection volume of the second weak sub-regions to the injection volume of the first weak region, wherein...

[0020] The number of nozzles opened is equal to the sum of the number of the first weak region and the number of projection points of the second weak sub-region at different positions on a plane perpendicular to the injection direction.

[0021] Furthermore, based on the fact that the relative proportion is less than the preset relative proportion, it is determined that the air separation direction is concentrated, and the current injection speed value of the protective gas is obtained, and the injection speed of the protective gas is increased.

[0022] Furthermore, the injection velocity is negatively correlated with the gas temperature surrounding the protective gas.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention obtains the air thermal image of the welding area by setting a detection mechanism, and delineates the area where the air velocity at several locations in the welding area and the area where the arc-heated air generated by the welding head compresses the shielding gas as the shielding gas pre-injection area. This ensures that the shielding gas is not affected by the arc-heated air, and allows the shielding gas to be injected into the welding area in a targeted, quantitative, and speed manner, thereby improving the injection efficiency of the shielding gas into the welding area. This significantly slows down the oxidation reaction between the metal parts to be welded and the solder during welding, resulting in stronger rigidity and better airtightness of the solder formed after welding the tubular container frame. By determining the injection amount of the shielding gas according to the air separation direction, the injection amount of the shielding gas is more precise, thereby improving the injection efficiency of the shielding gas. By determining the injection speed of the shielding gas according to the concentrated air separation direction, the protection range of the shielding gas during the welding process is further enhanced, and the injection efficiency of the shielding gas is improved.

[0024] Furthermore, by acquiring the air thermal image of the welding area and the air velocity at several locations in the welding area, the present invention analyzes the arc-heated air in the welding area and the air velocity at several locations in the welding area, providing data support for subsequently determining the air separation direction type.

[0025] Furthermore, the present invention connects a control structure to the detection mechanism, enabling the control structure to analyze the flow trends of the arc hot air and protective gas in the welding area based on the detection mechanism, and adjust the plurality of nozzles to inject into a preset position, direction, at a preset speed and injection volume.

[0026] Furthermore, the present invention adjusts the injection volume or injection speed of the protective gas by detecting the relative proportion of the width of the protective gas tip to the angle range of the protective gas entry during a first preset time when the protective gas enters the pre-injection area, thereby improving the injection efficiency and injection accuracy of the protective gas.

[0027] Furthermore, the present invention optimizes the distribution of protective gas by adjusting the injection angle and injection volume of the nozzle according to the sum of the number of the first weak region and the number of the second weak sub-region, thereby improving the welding quality and ensuring that the protective gas effectively covers the welding area.

[0028] Furthermore, by determining that the air separation direction is concentrated, the present invention adjusts and increases the injection speed of the protective gas to improve the injection efficiency of the protective gas into the welding area and ensure the effective coverage of the welding area by the protective gas, thereby preventing the welding area from being polluted by air and oxidized.

[0029] Furthermore, the present invention improves the airtightness between the solder and the metal parts to be welded and the rigidity of the solder in the welding area by setting a cooling mechanism to circulate air and cool the welding area. Attached Figure Description

[0030] Figure 1 This is an overall structural block diagram of the welding device for manufacturing a tubular container frame according to an embodiment of the present invention;

[0031] Figure 2 This is a front cross-sectional view of the edge surface of the welding mechanism and the area of ​​the metal part to be welded in the air compression region of the tubular container frame manufacturing welding device according to an embodiment of the present invention;

[0032] Figure 3 A schematic diagram showing the width of the protective gas tip and the tip boundary contour of the welding device for manufacturing a tubular container frame according to an embodiment of the present invention.

[0033] Explanation of reference numerals in the attached drawings: 1-Edge surface of the air compression area, 2-Welding head, 3-Metal part to be welded, 4-First plane, 5-Second plane, 6-Tip boundary profile, 7-Nozzle, 8-Gas storage section. Detailed Implementation

[0034] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0035] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0036] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0037] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] Please see Figure 1 , Figure 2 and Figure 3The figures shown are, respectively, an overall structural block diagram of the tubular container frame fabrication and welding device according to an embodiment of the present invention, a front sectional view of the edge surface of the welding mechanism and the metal part to be welded and the air extrusion area, a schematic diagram of the width of the protective gas tip, and a schematic diagram of the width and tip boundary contour of the protective gas tip; the tubular container frame fabrication and welding device of the present invention includes:

[0039] A welding mechanism for welding and fixing metal parts to be welded on a tubular container frame, including a welding head for converting solid solder into molten solder, a gas storage unit for storing protective gas, and several nozzles connected to the gas storage unit for releasing protective gas to the welding area.

[0040] The detection mechanism, which is connected to the welding mechanism, is used to acquire the air thermal image of the arc distribution space and the air velocity at several sampling positions above the welding area.

[0041] A control mechanism, connected to both the welding mechanism and the detection mechanism, is used to determine the air compression zone around the welding head based on the air thermal image; determine the pre-injection zone of the protective gas based on the air compression zone; estimate the air separation direction of the protective gas based on the relative proportion determined by the width of the protective gas tip and the length of the straight lines at both ends of the arc corresponding to the angle range of the protective gas entering the welding area; determine the injection volume and injection velocity of the protective gas based on the air separation direction; and determine the number of nozzles to be opened based on the number and location of weak areas in the air separation zone included in the dispersed air separation direction.

[0042] The air separation direction includes centralized and decentralized types.

[0043] Specifically, the gas storage section is a high-pressure gas cylinder.

[0044] In practice, the present invention also includes a cooling mechanism connected to the welding mechanism to circulate and cool the welding area with air to improve the airtightness of the solder in the welding area and the rigidity of the solder in the welding area.

[0045] Specifically, the cooling mechanism can adopt a water-cooled welding torch solution. The cooling mechanism includes a circulating water pump, a water tank / heat exchanger, a water pipe circuit, and a temperature sensor and flow meter. The operation of the cooling mechanism is a conventional technical means well known to those skilled in the art, and the operation process and operating principle will not be described in detail here.

[0046] Specifically, the testing institutions include:

[0047] Thermocouple array (not shown in the figure) forms an air thermal image of the arc distribution space by collecting the temperature at several corresponding heat sampling points.

[0048] An ultrasonic anemometer (not shown in the figure) is used to obtain the airflow velocity at several locations in the welding area.

[0049] Those skilled in the art will understand that the thermocouple array can be embedded in the welding torch nozzle in a non-contact manner, or it can be placed on the welding worktable. Those skilled in the art can make corresponding adjustments and selections according to the actual situation. The ultrasonic anemometer array can be set with several ultrasonic probes evenly arranged around the circumference of the welding torch nozzle. The number can be set according to the actual situation. Alternatively, the ultrasonic anemometer array can also be set on a cantilever above the metal part to be welded. The specific setting position can be adapted according to the actual situation. No specific limitation is made here.

[0050] In this invention, the thermocouple array uses a FLIR A655sc thermocouple array with a resolution of 0.1 mm / pixel, a temperature measurement range of -40℃ to 1200℃, and a frame rate of 60Hz; the ultrasonic anemometer array uses an ultrasonic anemometer array with a frame rate of 1000fps.

[0051] In practice, this invention analyzes the arc-heated air in the welding area and the air velocity at several locations in the welding area by acquiring the air thermal image of the welding area, thus providing data support for determining the air separation direction type.

[0052] Specifically, the temperature of all heat sampling points within the arc distribution space is greater than the preset temperature. The largest spatial area enclosed by all heat sampling points, including the arc space, that meet the condition of having a temperature greater than the preset temperature is defined as the air compression area around the welding head.

[0053] In practice, the present invention connects a control structure to the detection mechanism, so that the control structure analyzes the flow trend of the arc hot air and protective gas in the welding area according to the detection mechanism and adjusts the preset position and direction of the nozzles to inject at a preset speed and injection volume.

[0054] Specifically, the air thermal image of the welding area and the air velocity at several locations in the welding area are obtained through a thermocouple array and an ultrasonic anemometer array. The thermocouple array can display air at different temperatures in the welding area in different colors or grayscale to form an air thermal image. Based on the air thermal image and the air velocity analysis at several locations in the welding area, the edge surface of the air compression area is formed by smoothly connecting the heat points on the air thermal image where the heat difference between the arc hot air and the shielding gas is greater than a first preset heat difference.

[0055] Please refer to Figure 2The horizontal plane where the metal part to be welded is located is designated as the first plane 4, and the horizontal plane where the nozzle with the largest vertical height on the plane perpendicular to the metal part to be welded is located is designated as the second plane 5. The area enclosed by the first plane 4, the second plane 5, and the edge surface 1 of the air compression area is defined as the pre-injection area of ​​the protective gas.

[0056] Specifically, based on the ultrasonic anemometer array, the width of the protective gas tip within a first preset time period when the protective gas enters the pre-injection area is detected, and the preset relative proportion is the ratio of the width of the protective gas tip to the length of the straight lines at both ends of the arc corresponding to the angle range of the protective gas entry.

[0057] Please refer to Figure 3 The width of the protective gas tip is the maximum width of the tip boundary contour 6 formed after the protective gas is ejected within a first preset time on a straight line perpendicular to the injection direction.

[0058] Specifically, Figure 3 The arrow in the diagram indicates the direction in which the protective gas is injected.

[0059] Specifically, in the air thermal image, the protective gas, due to its lower temperature compared to the hot air from the electric arc, exhibits a specific temperature distribution area. Using a threshold segmentation image processing method, the tip boundary contour of the protective gas entering the pre-injection area is identified. A straight line is drawn perpendicular to the gas flow direction on this tip boundary contour. The number of pixels intersecting the straight line with the tip boundary contour is counted, and this number is calculated as the tip width. Based on the flow trend of the protective gas in the air thermal image, with the center of the nozzle of welding head 2 as the vertex, the angle range of the gas flow direction is the entry angle. This angle range is converted to radians, and the relative proportion is equal to the tip width divided by the angle range.

[0060] In this embodiment, the first preset time for the protective gas to be ejected is set to 3 seconds.

[0061] One specific embodiment uses a FLIR A655sc thermocouple array with a resolution of 0.1 mm / pixel, a temperature measurement range of -40°C to 1200°C, and a frame rate of 60 Hz. This allows for real-time capture of the air thermal image of the welding area, and the gas flow trajectory can be observed using an ultrasonic anemometer array with a frame rate of 1000 fps.

[0062] The pixels in the welding area are identified by a thermocouple array and converted into an actual area of ​​25. ;

[0063] If the pixel distance between the two points where the straight line observed by the thermocouple array intersects the tip boundary profile is 80 pixels, then the tip width is 8 mm.

[0064] Given that the distance from the nozzle to the pre-injection area is 20 mm, a spherical coordinate system is established with the nozzle center as the origin. An image processing algorithm is used to identify the angle of the gas flow trajectory. and , It is 15°. If the angle is 45°, then the angle range is 30°, which is 0.524 rad in radians. The length of the straight lines at both ends of the arc corresponding to the angle range is r × Δθ = 20 mm × 0.524 rad = 10.48 mm. According to the fact that the relative proportion is equal to the width of the tip divided by the length of the straight lines at both ends of the arc corresponding to the angle range in which the protective gas enters, the relative proportion is 8 mm / 10.48 mm = 76.3% = 0.763.

[0065] In practice, this invention adjusts the injection volume or injection speed of the protective gas by detecting the relative ratio of the width of the protective gas tip at a first preset time when the protective gas enters the pre-injection area to the length of the straight lines at both ends of the arc corresponding to the angle range of the protective gas entry, thereby improving the injection efficiency and injection accuracy of the protective gas.

[0066] Specifically, when the relative proportion is greater than or equal to a preset relative proportion, the air separation direction is determined to be dispersed.

[0067] If the air separation direction is dispersed, the weak area where the temperature exceeds the standard temperature of the protective gas by a preset amount and the residence time around the protective gas is greater than or equal to the preset residence time is divided into a first weak area and a second weak area. The area above the tip of the protective gas is the first weak area, and the area around the tip of the protective gas, excluding the area above it, is the second weak area.

[0068] In this embodiment, experimental and practical application data show that when the relative proportion reaches 0.7, the distribution range of the protective gas expands significantly and it is easy to form a dispersed flow; when the ambient air temperature exceeds 1.2 times the standard temperature of the protective gas, the non-uniformity of the gas flow increases significantly; when the residence time reaches 2s, the temperature distribution of the weak area tends to stabilize. The preset amount is set to 1.2 times the standard temperature of the protective gas, the preset residence time is 2s, and the preset relative proportion is 0.7.

[0069] Specifically, based on the existence of a first weak region above the tip of the protective gas, whose direction is opposite to the injection direction of the protective gas, the injection volume of the protective gas is increased; if a second weak region exists, the number and position of the second weak sub-regions within the second weak region are obtained, the corresponding number of nozzles opened is adjusted according to the number of projection points of the second weak sub-regions on the plane perpendicular to the injection direction, and the injection angle and injection volume of each nozzle are adjusted according to the number of the second weak sub-regions closest to the plane perpendicular to the injection direction.

[0070] When a second weak region is detected, the position of the corresponding second weak sub-region relative to the tip of the protective gas is detected. If the projection points of the second weak sub-region at different positions on the plane perpendicular to the injection direction are located to the left, right, and below the tip of the protective gas, the number of nozzles is adjusted to 3. The angle of each nozzle is adjusted by using the angle between the vertical bisector of the nozzle and the center point of its corresponding second weak sub-region as the deflection angle. After the angle adjustment, the injection strategy of the nozzles is adjusted to the injection volume adjustment method for the first weak region.

[0071] Specifically, based on the temperature boundary surface surrounding the protective gas, several second weak sub-regions are identified from the second weak region. The positions of the several nozzles are adjusted to be above each of the second weak sub-regions, and the injection strategy of the nozzles at this time is to adjust the injection volume of the second weak sub-regions to the injection volume of the first weak region.

[0072] The number of nozzles opened is equal to the sum of the number of the first weak region and the number of projection points of the second weak sub-region at different positions on a plane perpendicular to the injection direction.

[0073] In a specific embodiment, if the number of first weak regions detected is 1, and the number of projection points of the second weak sub-region at different positions on the plane perpendicular to the injection direction is 3, then the number of nozzles is 4.

[0074] In practice, the present invention adjusts the injection angle and injection volume of the nozzle by determining the sum of the number of the first weak region and the number of projection points of the second weak sub-region at different positions on a plane perpendicular to the injection direction, thereby optimizing the distribution of the protective gas, improving the welding quality, and ensuring that the protective gas effectively covers the welding area.

[0075] Specifically, based on the fact that the relative proportion is less than the preset relative proportion, the air separation direction is determined to be concentrated, and the current injection speed value of the protective gas is obtained, and the injection speed of the protective gas is increased.

[0076] In a specific embodiment, under standard atmospheric pressure, the initial injection rate is 12L / min, the protective gas temperature is 28℃, and the air separation direction is concentrated. The protective gas injection rate needs to be increased to 12L within a preset time (0.5 minutes). The adjusted injection rate is the preset injection rate divided by the preset time, that is, the adjusted injection rate = 12 / 0.5 = 24L / min.

[0077] Specifically, the injection velocity is negatively correlated with the temperature of the gas surrounding the protective gas.

[0078] In practice, this invention determines that the air separation direction is concentrated, adjusts and increases the injection speed of the protective gas to improve the injection efficiency of the protective gas into the welding area and ensures effective coverage of the welding area by the protective gas, thereby preventing the welding area from being polluted by air and oxidized.

[0079] In practice, the present invention improves the airtightness of the solder in the welding area and the rigidity of the solder in the welding area by setting a cooling mechanism to circulate air and cool the welding area.

[0080] Working process: Solder is evenly distributed onto the welding area of ​​the metal part to be welded through the welding head; the gas storage unit 8 releases protective gas and sprays it into the welding area through several nozzles to isolate the air from the welding area and prevent oxidation and contamination. A thermocouple array is used to obtain an air thermal image of the arc distribution space to analyze the temperature distribution of the welding area. An ultrasonic anemometer array is used to obtain the air velocity at several sampling locations in the welding area to analyze the flow state of the protective gas. Based on the air thermal image, the heat points of the arc-generated hot air and the protective gas are identified. The heat points with a heat difference greater than a first preset heat difference are calculated and smoothly connected to form the edge surface 1 of the air compression area. The air compression area is determined by defining the area above the plane where the metal part to be welded 3 is located as the first plane 4 and the area below the plane where the nozzle 7 with the largest vertical height perpendicular to the plane where the metal part to be welded 3 is located as the second plane 5. The area enclosed by the first plane 4, the second plane 5, and the edge surface 1 of the air compression area is defined as the pre-injection area of ​​the protective gas. Based on the ultrasonic anemometer array, the width of the protective gas tip within a first preset time is detected when the protective gas enters the pre-injection area. The relative proportion is calculated based on the lengths of the straight lines at both ends of the arc corresponding to the width of the protective gas tip and the angle range of the protective gas entry. The air separation direction of the protective gas is estimated based on this relative proportion. If it is a dispersed type, the air temperature around the protective gas is detected, and weak areas with temperatures greater than a preset multiple of the standard protective gas temperature are identified. Based on the residence time of the weak areas around the protective gas being greater than or equal to a certain value, they are divided into a first weak area (located above the protective gas tip) and a second weak area (located around the area excluding the protective gas tip). The injection volume of the protective gas is increased based on the first weak area; the number of nozzles, injection angle, and injection volume are adjusted based on the number and location of the second weak sub-areas. If it is a concentrated type, and the air separation direction is concentrated, the gas temperature around the protective gas is less than or equal to a preset multiple of the standard protective gas temperature. The injection speed of the protective gas is increased so that the protective gas reaches the preset injection volume within a preset time. After welding, the cooling mechanism circulates air to cool the welding area, and then checks the airtightness of the welding area and the rigidity of the solder.

[0081] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles 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 all fall within the scope of protection of the present invention.

Claims

1. A welding apparatus for fabricating a tubular container frame, characterized in that, include: A welding mechanism for welding and fixing metal parts to be welded on a tubular container frame, including a welding head for converting solid solder into molten solder, a gas storage unit for storing protective gas, and several nozzles connected to the gas storage unit for releasing protective gas to the welding area. The detection mechanism, connected to the welding mechanism, is used to acquire thermal images of the air in the arc distribution space and air velocity at several sampling locations above the welding area. The detection mechanism includes an ultrasonic anemometer array for obtaining airflow velocities at several locations in the welding area. A control mechanism, connected to both the welding mechanism and the detection mechanism, is used to determine the air compression zone around the welding head based on the air thermal image; determine the pre-injection zone of the protective gas based on the air compression zone; estimate the air separation direction of the protective gas based on the relative proportion determined by the width of the protective gas tip and the length of the straight lines at both ends of the arc corresponding to the angle range of the protective gas entering the welding area; determine the injection volume and injection velocity of the protective gas based on the air separation direction; and determine the number of nozzles to be opened based on the number and location of weak areas in the air separation zone included in the dispersed air separation direction. The air separation orientation includes centralized and decentralized types; Based on the ultrasonic anemometer array, the width of the protective gas tip within a first preset time when the protective gas enters the pre-injection area is detected, and the preset relative proportion is the ratio of the width of the protective gas tip to the length of the straight lines at both ends of the arc corresponding to the angle range of the protective gas entry. When the relative proportion is greater than or equal to the preset relative proportion, the air separation direction is determined to be dispersed. If the air separation direction is dispersed, the weak area where the temperature exceeds the standard temperature of the protective gas by a preset amount and the residence time around the protective gas is greater than or equal to the preset residence time is divided into the first weak area and the second weak area. The area above the tip of the protective gas is the first weak area, and the area around the tip of the protective gas, excluding the area above, is the second weak area. Based on the existence of a first weak region above the tip of the protective gas, whose direction is opposite to the injection direction of the protective gas, the injection volume of the protective gas is increased; if a second weak region exists, the number and position of the second weak sub-regions in the second weak region are obtained, the corresponding number of nozzles opened is adjusted according to the number of projection points of the second weak sub-regions on the plane perpendicular to the injection direction, and the injection angle and injection volume of each nozzle are adjusted according to the number of the second weak sub-regions closest to the plane perpendicular to the injection direction. Based on the fact that the relative proportion is less than the preset relative proportion, the air separation direction is determined to be concentrated, and the current injection speed value of the protective gas is obtained, and the injection speed of the protective gas is increased.

2. The tubular container frame fabrication and welding device according to claim 1, characterized in that, The testing institution also includes: A thermocouple array, which collects the temperature at several corresponding heat sampling points to form an air thermal induction of the arc distribution space.

3. The tubular container frame fabrication and welding device according to claim 2, characterized in that, The temperature of all heat sampling points within the arc distribution space is greater than the preset temperature. The largest spatial area enclosed by all heat sampling points, including the arc distribution space, whose temperatures are greater than the preset temperature, is defined as the air compression area around the welding head.

4. The tubular container frame fabrication and welding device according to claim 3, characterized in that, The horizontal plane where the metal part to be welded is located is taken as the first plane, and the horizontal plane where the nozzle with the largest vertical height on the plane where the metal part to be welded is located is taken as the second plane. The area surrounded by the first plane, the second plane and the edge of the air compression area is defined as the pre-injection area of ​​the protective gas.

5. The tubular container frame fabrication and welding device according to claim 4, characterized in that, Based on the second weak region, several second weak sub-regions are identified on the temperature boundary surface around the protective gas. The positions of the several nozzles are adjusted to be above each second weak sub-region, and the injection strategy of the nozzles at this time is to adjust the injection volume of the second weak sub-regions to the injection volume of the first weak region. The number of nozzles that are opened is equal to the sum of the number of the first weak region and the number of projection points of the second weak sub-region at different positions on a plane perpendicular to the injection direction.

6. The tubular container frame fabrication and welding apparatus according to claim 5, characterized in that, The injection velocity is negatively correlated with the temperature of the gas surrounding the protective gas.

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