A low-temperature welding insulation device for ultra-high voltage angle steel towers

Abstract

This application relates to the technical field of metal welding insulation, and in particular to a low-temperature welding insulation device for ultra-high voltage angle steel towers; it includes a ring-shaped operating table, a feeding rack, a discharging rack, and a welding mechanism. This invention can preheat the joint of the angle steel body, reducing internal stress caused by uneven temperature. After welding, the gas cooled by heat exchange is introduced into the discharging rack through an exhaust pipe, forming a buffer gas layer on the weld surface. This accelerates cooling and avoids temperature shock. Furthermore, by combining precise preheating of the angle steel body joint before welding, dynamic heat insulation of the angle steel body joint during welding, and gradient heat dissipation of the weld joint after welding, this invention not only significantly reduces thermal stress concentration caused by sudden temperature changes, but also fundamentally improves the quality stability of the weld formation and the structural reliability of the angle steel product.

Description

Technical Field

[0001] This application relates to the technical field of metal welding insulation, and in particular to a low-temperature welding insulation device for ultra-high voltage angle steel towers. Background Technology

[0002] In ultra-high voltage power transmission systems, angle steel towers are critical supporting structures, and their safety is directly related to the stable operation of the entire power grid. Since angle steel towers are mainly formed by welding, during construction in cold regions, a sudden drop in ambient temperature can cause changes in the physical and chemical state of the welding materials, leading to defects such as welding cracks and increased material hardness, which seriously endanger welding quality and structural safety.

[0003] Therefore, it is crucial to perform necessary thermal insulation treatment on the angle steel body during the welding process. For example, patent application CN217529695U discloses a standardized thermal insulation structure for low-temperature welding of steel structures, mainly composed of four thermal insulation covers arranged at the ends of the upper and lower flange plates. Each thermal insulation cover includes three insulation boards: the first and second insulation boards are respectively held parallel to each other on the inner and outer sides of the flange plate, and the third insulation board is vertically fixed to the outer edge of the flange plate end and perpendicularly connected to the first two boards. All insulation boards consist of a shell and an internal rock wool insulation layer. This structure is fixed by the first insulation board abutting against the side of the steel beam web plate, which has the characteristics of easy assembly and disassembly, saving time and effort, effectively maintaining the weld temperature, avoiding sudden temperature drops, and significantly improving the welding quality.

[0004] From the perspective of material properties, angle steel is one of the common profiles in steel structure systems. Its material properties are consistent with those of the main steel structure. Therefore, in the welding process, the welding insulation scheme designed for steel structures in the above-mentioned existing technologies is also applicable to the welding insulation treatment of angle steel in both theory and practice.

[0005] However, the aforementioned existing technologies can only provide insulation for the welded steel structure. In cold environments, the temperature of the steel structure drops to a low level, creating a huge temperature difference with the high-temperature welding material that reaches thousands of degrees Celsius during welding. When the high-temperature welding material comes into contact with the low-temperature steel structure surface, the welded area of ​​the steel structure will experience drastic temperature changes in a very short time, causing thermal expansion and contraction in the welded area and generating great stress, which may ultimately lead to cracks in the weld of the steel structure.

[0006] Based on the above viewpoints, there is still room for improvement in the existing technology for welding and insulating angle steel bodies. Summary of the Invention

[0007] To solve the above-mentioned technical problems, this application provides a low-temperature welding insulation device for ultra-high voltage angle steel towers, adopting the following technical solution:

[0008] In a first aspect, a low-temperature welding insulation device for ultra-high voltage angle steel towers includes:

[0009] The circular operating table has an annular groove inside.

[0010] The feeding rack and discharging rack are symmetrically arranged along the length of the annular operating table. Both of them have cavities inside, and the center of each cavity has a square groove.

[0011] The welding mechanism disposed within the annular groove includes a sliding block, an adaptive cylinder mounted on the sliding block, and a welding machine disposed at the telescopic end of the adaptive cylinder.

[0012] A horizontal distance is provided between the square groove of the feeding rack and the welding operation center point of the welding machine inside the annular groove. This distance is equal to the standard length of the angle steel body, so that the connection of the angle steel body can be accurately positioned in the square groove for preheating and in the annular groove for welding during the conveying process.

[0013] The feeding rack is equipped with an air inlet pipe that communicates with the square groove. One end of the air inlet pipe that extends into the square groove is provided with an air outlet, which is used to guide the residual heat gas generated by welding in the annular groove into the square groove inside the feeding rack to preheat the connection of the angle steel body.

[0014] Preferably, the square groove of the feeding rack is provided with a resistance wire for actively preheating the connection of the angle steel body in the early stage of welding.

[0015] Preferably, the two ends of the feeding rack are respectively provided with baffle one and baffle two, and the baffle one and baffle two are matched with the inside corner shape of the angle steel body to form a relatively closed preheating space in the feeding rack cavity.

[0016] Preferably, it also includes an exhaust pipe located between the feeding rack and the discharging rack. One end of the exhaust pipe is connected to the cavity of the feeding rack, and the other end of the exhaust pipe extends into the square groove area inside the discharging rack and is provided with an exhaust hole 2, which is used to guide the preheated residual heat gas into the square groove inside the discharging rack to dissipate heat and protect the weld.

[0017] Preferably, the end of the discharge rack near the annular operating table is provided with a baffle plate three, which is used to block gas exchange between the discharge rack cavity and the annular groove.

[0018] Preferably, the outer walls of the feeding rack and the discharging rack are provided with a heat insulation layer.

[0019] Preferably, the feed rack is equipped with a thermometer to monitor the preheating temperature inside the square trough.

[0020] Preferably, the adaptive cylinder drives the welding machine to move along the shape trajectory of the angle steel body connection, so that the welding head of the welding machine always stays in contact with the angle steel body connection.

[0021] Preferably, the sliding block is driven by an electric slider to move within the annular groove.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. The relatively enclosed space allows hot air to preheat the joints of the angle steel body, reducing internal stress caused by uneven temperature. After welding, the gas cooled by heat exchange is introduced into the discharge rack through the exhaust pipe, forming a buffer gas layer on the weld surface. This accelerates cooling and avoids temperature shocks. By combining precise preheating of the angle steel body joints before welding, dynamic heat preservation of the joints during welding, and gradient heat dissipation of the weld joints after welding, not only is the thermal stress concentration caused by sudden temperature changes significantly reduced, but the quality stability of the weld formation and the structural reliability of the angle steel products are also fundamentally improved.

[0024] 2. By strictly setting the spacing between the square groove and the welding point, the distance between the square groove and the end of the feed rack, and the distance of each push of the angle steel body to the standard length of the angle steel, it is ensured that the connection of the angle steel body can accurately stop at the preheating station and the welding station in sequence. This design guarantees the accuracy of welding alignment, fundamentally avoiding welding misalignment and missed welding caused by positioning deviation, and realizing a continuous, orderly and stable welding process.

[0025] 3. In the initial stage of welding, active preheating is carried out by resistance wire. When the residual heat accumulated in the annular groove during welding reaches the required temperature, hot air is introduced into the square groove inside the feed rack through the air inlet pipe to form an annular heating layer that continuously provides heat. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural schematic diagram of the present invention.

[0027] Figure 2 This is a three-dimensional installation structure diagram of the ring-shaped operating table, feeding rack, and exhaust pipe of the present invention.

[0028] Figure 3 This is the present invention. Figure 2 A magnified view of part A.

[0029] Figure 4 This is a schematic diagram of the installation structure between the first baffle, the second baffle, and the square groove of the present invention.

[0030] Figure 5 This is a schematic diagram of the internal structure of the annular groove of the present invention (viewed from the feed rack to the discharge rack).

[0031] Figure 6 This is a schematic diagram of the internal three-dimensional structure of the discharge rack of the present invention.

[0032] Figure 7 This is the present invention. Figure 6 A magnified view of section B.

[0033] Explanation of reference numerals in the attached drawings: 1. Circular operating platform; 100. Angle steel body; 11. Circular groove; 12. Air inlet pipe; 13. Air outlet one; 2. Feed rack; 21. Baffle one; 22. Baffle two; 23. Exhaust pipe; 25. Air outlet two; 26. Baffle three; 3. Discharge rack; 4. Square groove; 5. Welding mechanism; 51. Sliding block; 52. Adaptive cylinder; 53. Welding machine; 6. Insulation layer. Detailed Implementation

[0034] The following is in conjunction with the appendix Figures 1 to 7 This application will be described in further detail.

[0035] This application discloses a low-temperature welding insulation device for ultra-high voltage angle steel towers. By preheating the welding area, the temperature difference between the high-heat welding material and the angle steel body is reduced, thereby reducing the stress generated by thermal expansion and contraction in the welding area of ​​the angle steel body and avoiding the possibility of weld cracks.

[0036] A low-temperature welding and insulation device for ultra-high voltage angle steel towers includes a ring-shaped operating platform 1. A feeding rack 2 and a discharging rack 3 are symmetrically installed on the ring-shaped operating platform 1 along its length. A welding mechanism 5 is installed inside the ring-shaped operating platform 1.

[0037] Specifically, both the feeding rack 2 and the discharging rack 3 have cavities inside, and each cavity has a square groove 4 inside.

[0038] The annular operating table 1 has an annular groove 11 inside. The welding mechanism 5 includes a sliding block 51 disposed inside the annular groove 11. An adaptive cylinder 52 is mounted on the sliding block 51 via a cylinder seat. A welding machine 53 is mounted on the telescopic end of the adaptive cylinder 52.

[0039] It should be noted that the square groove 4 is located in the middle of the feeding rack 2 and the discharging rack 3. There is a horizontal distance between the square groove 4 and the welding operation center point of the welding machine 53 inside the annular groove 11. This horizontal distance is exactly equal to the standard length of the angle steel body 100, ensuring that when the angle steel body 100 is transported to the welding area, the connection point of the angle steel body 100 to be welded can be accurately aligned with the welding machine 53. On the other hand, the distance from the square groove 4 to the end edge of the feeding rack 2 away from the annular operating table 1 is also completely consistent with the standard length of the angle steel body 100, providing a precise basis for the initial positioning of the angle steel after it enters the device from the end of the feeding rack 2 away from the annular operating table 1.

[0040] At the same time, the distance that the angle steel body 100 moves along the conveying direction each time is strictly equal to the length of the angle steel body 100 itself. This precise displacement design, in conjunction with the aforementioned distance parameters, fundamentally ensures that the angle steel body 100 can enter the device stably in a continuous and orderly manner.

[0041] With the cooperation of the above data, the device can always maintain a stable welding operation process. That is, the angle steel body 100 that has not entered the welding process will always stay precisely in the positioning area of ​​the square groove 4 at the connection point to be welded; while the angle steel body 100 that is undergoing welding operation can keep the connection point aligned with the welding machine 53 in the annular groove 11, avoiding problems such as welding misalignment and missed welding caused by positioning deviation.

[0042] The driving force for pushing the angle steel body 100 can be provided by an existing cylinder (not shown in the figure). It should be noted that the angle steel is straight enough. In specific operation, the existing cylinder installed on the feed rack 2 pushes the angle steel body 100 into the feed rack 2. After the first angle steel body 100 is completely in the feed rack 2, a new angle steel body 100 is put into the feed rack 2. The new angle steel body 100 abuts against the first angle steel body 100 and continues to move inside the cavity. When the new angle steel body 100 is completely moved into the feed rack 2, the connection point of the two angle steel bodies 100 is located in the square groove 4 inside the feed rack 2.

[0043] The square groove 4 inside the feed rack 2 is equipped with a resistance wire (not shown in the figure). When the resistance wire is energized, it can heat the air inside the square groove 4, thereby preheating the connection of the angle steel body 100.

[0044] After heating for a period of time, the angle steel body 100 continues to be fed into the feed rack 2. The newly fed angle steel body 100 pushes the preheated angle steel body 100 to continue moving. When the newly fed angle steel body 100 is completely inside the feed rack 2, the connection of the preheated angle steel body 100 is inside the annular operating table 1 and aligned with the welding machine 53. The connection between the newly fed angle steel body 100 and its adjacent angle steel body 100 is located in the square groove 4 inside the feed rack 2.

[0045] At this time, the existing electric slider (not shown in the figure) drives the sliding block 51 to move inside the annular groove 11. During the movement of the sliding block 51, the adaptive cylinder 52 drives the welding machine 53 to perform welding treatment on the connection of the angle steel body 100.

[0046] The adaptive cylinder 52, controlled by a PLC, can design a predetermined trajectory based on the shape of the angle steel body 100, ensuring that the welding head on the welding machine 53 is always in contact with the connection point of the angle steel body 100.

[0047] An air inlet pipe 12 is installed on the side wall of the circular operating table 1. The side of the air inlet pipe 12 away from the circular operating table 1 is connected to the square groove 4 inside the feed rack 2. An air outlet 13 is symmetrically opened at one end of the air inlet pipe 12 inside the square groove 4 along the vertical direction of the square groove 4.

[0048] As the welding operation continues, heat accumulates inside the annular groove 11 due to the prolonged operation of the welding machine 53, causing the ambient temperature inside the groove to gradually rise. During the temperature rise, the air inside the annular groove 11 expands due to the heat. When the air pressure inside the annular groove 11 is higher than the external air pressure, the expanded hot air will escape outward along the air inlet pipe 12. The hot air maintains a stable flow within the air inlet pipe 12 and eventually escapes evenly from the air outlet 13 of the air inlet pipe 12.

[0049] The hot air escaping from the vent 13 flows directly into the square groove 4 area inside the feed rack 2, forming an annular heating layer around the connection of the angle steel body 100 within the square groove 4. This allows the hot air generated by welding residual heat to continuously provide heat to the connection of the angle steel body 100 within the square groove 4, achieving the recycling of welding residual heat. This not only improves heat utilization efficiency but also further ensures the uniformity of preheating.

[0050] To precisely control the preheating temperature, an existing thermometer (not shown in the figure) is installed on the air inlet pipe 12. The probe of this thermometer is placed directly inside the air inlet pipe 12 to monitor the temperature data in the square groove 4 in real time. When the thermometer shows that the hot air temperature has reached the preset standard, that is, the optimal preheating temperature required by the angle steel body 100, the power supply to the previously working resistance wire is manually cut off to stop heating. At this time, the heat generated by the continuous welding operation inside the annular groove 11 is sufficient to meet the preheating requirements of the connection of the angle steel body 100, and there is no need to rely on the resistance wire to provide additional heat.

[0051] Therefore, the core role of the resistance wire in the entire welding process is preheating in the initial stage of welding. At the very beginning of the welding operation and before sufficient heat has accumulated in the annular groove 11, the resistance wire acts as the initial preheating source, quickly providing the necessary heat for preheating the angle steel body 100 connection point within the square groove 4, ensuring the quality and efficiency of preheating in the initial stage of welding. Once the hot air temperature inside the annular groove 11 reaches the expected temperature, the resistance wire can be turned off, and the residual heat generated during welding can be used to complete the subsequent preheating work. This design not only reduces unnecessary power consumption and lowers equipment operating costs but also achieves energy recycling.

[0052] In addition, the outer walls of the feeding rack 2 and the discharging rack 3 are provided with a heat insulation layer 6 to insulate the feeding rack 2 and the discharging rack 3 and reduce the possibility of rapid heat loss.

[0053] Furthermore, by preheating the connection of the angle steel body 100 locally, the temperature difference between the connection of the angle steel body 100 and the high-heat welding material at thousands of degrees Celsius during the welding process is effectively reduced, thereby reducing the stress generated by thermal expansion and contraction in the welding area and reducing the possibility of cracks appearing in the welding area.

[0054] If only a portion of the angle steel body 100 is heated during welding, the weld area will generate enormous temperatures compared to other parts of the angle steel. The thermal expansion and contraction properties of metals will hinder expansion in the high-temperature area, resulting in significant thermal stress. To avoid this problem, baffle 1 21 and baffle 22 can be installed at both ends of the feed rack 2, with baffle 22 positioned closer to one end of the annular operating table 1. Baffle 1 21 and baffle 22 fit into the internal corners of the angle steel body 100.

[0055] Specifically, baffle 1 21 and baffle 2 22 cooperate with each other to form a relatively sealed space with the cavity (gas can slightly escape from baffle 1 21, baffle 2 22 and angle steel body 100). The hot air escaping from vent 13 can flow inside the relatively sealed space. During the flow of hot air, the angle steel body 100 can be preheated as a whole, and the overall temperature of the angle steel body 100 tends to be uniform, reducing this uneven expansion, thereby significantly reducing internal stress and further reducing the possibility of weld cracks.

[0056] In order to depressurize the gas inside the relatively enclosed space, the present invention provides an exhaust pipe 23 between the feed rack 2 and the discharge rack 3. Specifically, the feed rack 2 is equipped with an exhaust pipe 23 that is connected to its internal cavity. The end of the exhaust pipe 23 away from the feed rack 2 is connected to the discharge rack 3, and the end of the exhaust pipe 23 away from the feed rack 2 is located inside the square groove 4 of the feed rack 2. The end of the exhaust pipe 23 located inside the square groove 4 is symmetrically provided with two air outlet holes 25 along the vertical direction of the square groove 4.

[0057] After welding, the angle steel body 100 continues to move, and the weld of the angle steel body 100 moves to the square groove 4 area of ​​the discharge rack 3. When the hot air inside the relatively enclosed space comes into contact with the angle steel body 100, it cools down. As the gas inside the relatively enclosed space expands, the excess gas cools down and is discharged from the exhaust pipe 23 through the exhaust hole 25 to the square groove 4 area of ​​the discharge rack 3. A ring-shaped heat dissipation layer is formed in the square groove 4 around the connection of the angle steel body 100. The cooled gas can blow heat off the weld, accelerate the cooling of the weld, and effectively reduce the temperature difference between the weld and the outside air when the angle steel body 100 continues to move and the weld moves out of the discharge rack 3. This avoids the impact on the structural stability of the weld due to excessive temperature difference.

[0058] It is important to note that the gas, after undergoing a 100° heat exchange with the angle steel body and then cooling down, still maintains a temperature higher than the ambient air temperature. This temperature characteristic allows the gas to not only dissipate heat from the weld but also provide additional protection: if a high-temperature weld comes into direct contact with cold air, it is highly susceptible to internal stress due to thermal expansion and contraction, which can lead to weld cracks; however, the slightly warmer dissipating gas forms a buffer layer on the weld surface, isolating the cold air from direct contact with the weld, significantly reducing the likelihood of weld cracks, and ensuring the welding quality and structural integrity of the weld.

[0059] Furthermore, after the annular heat dissipation layer completes its heat dissipation and protection functions, excess escaping gas will be discharged outward along the cavity of the discharge rack 3. During the gas discharge process, it can also simultaneously carry away some of the residual heat inside the angle steel body 100 and the discharge rack 3, further reducing the overall temperature of the angle steel body 100. This prevents the angle steel body 100 from directly contacting the external cold air when its temperature is too high, which could cause changes in the physical properties of the material due to sudden temperature changes, leading to problems such as bending and deformation of the angle steel. This ensures the dimensional accuracy and structural strength of the angle steel during subsequent processing and use.

[0060] To further optimize the temperature and gas environment control inside the discharge rack 3, a baffle 26 is installed at one end of the discharge rack 3 near the annular operating table 1. On one hand, the baffle 26 effectively prevents cold air with a lower temperature inside the discharge rack 3 from entering the annular groove 11, thus avoiding interference with the temperature stability and heat dissipation protection effect of the annular heat dissipation layer. On the other hand, it prevents hot air with a higher temperature inside the annular groove 11 from diffusing into the discharge rack 3 cavity, maintaining a relatively stable high-temperature environment inside the annular groove 11, and providing a stable heat source for the preheating step of using residual welding heat to heat the angle steel body 100.

[0061] Furthermore, the cooperation of baffle 3 26 and baffle 2 22 creates a sealed environment in the annular groove 11, so that the heat generated by welding by welding machine 53 can provide heat protection for the connection of the angle steel body 100 during welding in the sealed environment.

[0062] Furthermore, by constructing a series of steps throughout the entire welding process, the system achieves coordinated operation of three key aspects: precise preheating of the angle steel body 100 connection point before welding, dynamic thermal insulation of the angle steel body 100 connection point during welding, and gradient heat dissipation of the weld seam at the angle steel body 100 connection point after welding. Specifically, the preheating stage combines active heating with the recycling of residual welding heat to ensure the angle steel body 100 connection point reaches the optimal welding temperature; the insulation stage utilizes the sealed environment formed inside the annular groove 11 to effectively maintain temperature stability in the welding area and reduce heat loss; and the heat dissipation stage uses the cooled gas that has undergone heat exchange to form a buffer gas layer, achieving uniform cooling of the weld seam. These three interconnected steps not only significantly reduce thermal stress concentration caused by sudden temperature changes but also fundamentally improve the quality stability of the weld seam formation and the structural reliability of the angle steel product.

[0063] By repeating the above steps, welding can be performed on the angle steel body 100 in a low-temperature environment.

[0064] The principle of this invention:

[0065] This device achieves continuous processing of the angle steel body 100 through the symmetrical layout of the feeding rack 2, the annular operating table 1, and the discharging rack 3. The cavities of the feeding rack 2 and the discharging rack 3 are equipped with square grooves 4, the horizontal distance between which and the working center of the welding machine 53 in the welding mechanism 5 is strictly equal to the standard length of the angle steel body 100. Combined with the design that the distance the angle steel body 100 moves each time is equal to its own length, the connection point of the angle steel body 100 can be precisely positioned sequentially at the preheating station of the square groove 4 and the welding station of the annular groove 11, ensuring accurate welding alignment and avoiding misalignment and missed welds.

[0066] In the initial stage of welding, the resistance wire in the square groove 4 of the feed rack 2 actively preheats the connection point of the angle steel body 10. During welding, the residual welding heat accumulated in the annular groove 11 forms hot air, which is introduced into the square groove 4 of the feed rack 2 through the air inlet pipe 12 and escapes from the air outlet 13 to form an annular heating layer that continuously preheats the connection point of the angle steel body 10. When the residual heat temperature reaches the preset value, the resistance wire is turned off, realizing energy recycling. The welding machine 53 moves according to the shape trajectory of the angle steel through the adaptive cylinder 52 and PLC control, ensuring that the welding head is always in contact with the connection point of the angle steel body 100.

[0067] The baffles 21 and 22 at both ends of the feed rack 2, together with the internal corners of the angle steel body 100, form a relatively enclosed space, allowing hot air to flow within the cavity and achieving overall preheating of the angle steel body 100. Simultaneously, the insulation layers 6 installed on the outer sides of the feed rack 2 and the discharge rack 3 reduce heat loss. This overall preheating method ensures a more uniform temperature for the angle steel body 100, significantly reducing internal stress caused by uneven thermal expansion and contraction, and effectively preventing weld cracks.

[0068] The feeding rack 2 and the discharging rack 3 are connected by an exhaust pipe 23. Preheated residual heat gas is introduced through the exhaust pipe 23 and from the exhaust port 25 into the square groove 4 of the discharging rack 3, forming an annular heat dissipation layer to uniformly dissipate heat from the weld of the angle steel body 100. This gas temperature is higher than the ambient temperature, forming a buffer gas layer on the surface of the weld of the angle steel body 100. The baffle 26 at the end of the discharging rack 3 isolates it from cold air interference. Finally, the gas carries away residual heat and is discharged, further reducing the temperature of the angle steel body 100 and preventing deformation of the weld of the angle steel body 100 due to sudden temperature changes during discharge.

[0069] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0070] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A low-temperature welding insulation device for ultra-high voltage angle steel towers, characterized in that, include: A circular operating table with an annular groove inside; The feeding rack and discharging rack are symmetrically arranged along the length of the circular operating table. Both of them have cavities inside, and the center of each cavity has a square groove. The welding mechanism set in the annular groove includes a sliding block, an adaptive cylinder mounted on the sliding block, and a welding machine located at the telescopic end of the adaptive cylinder. A horizontal distance is provided between the square groove of the feeding rack and the welding operation center point of the welding machine inside the annular groove. This distance is equal to the standard length of the angle steel body, so that the connection of the angle steel body can be accurately positioned in the square groove for preheating and in the annular groove for welding during the conveying process. The feeding rack is equipped with an air inlet pipe that communicates with the square groove. One end of the air inlet pipe that extends into the square groove inside the feeding rack is provided with an air outlet, which is used to introduce the residual heat gas generated by welding in the annular groove into the square groove inside the feeding rack to preheat the connection of the angle steel body. The square groove of the feeding rack is equipped with a resistance wire, which is used to actively preheat the connection of the angle steel body in the early stage of welding. The feeding rack has a baffle plate one and a baffle plate two at its two ends respectively. The baffle plate one and the baffle plate two are matched with the inside corner shape of the angle steel body, so that the feeding rack cavity forms a relatively closed preheating space. It also includes an exhaust pipe located between the feeding rack and the discharging rack. One end of the exhaust pipe is connected to the cavity of the feeding rack, and the other end of the exhaust pipe extends into the square groove area inside the discharging rack and is provided with an exhaust hole 2, which is used to introduce the preheated residual heat gas into the square groove inside the discharging rack to dissipate heat and protect the weld. The discharge rack is equipped with a baffle plate three at one end near the annular operating table to block gas exchange between the discharge rack cavity and the annular groove.

2. The low-temperature welding insulation device for ultra-high voltage angle steel towers according to claim 1, characterized in that, The outer walls of the feeding rack and the discharging rack are provided with a heat insulation layer.

3. The low-temperature welding insulation device for ultra-high voltage angle steel towers according to claim 1, characterized in that, The feed rack is equipped with a thermometer to monitor the preheating temperature inside the square trough.

4. The low-temperature welding insulation device for ultra-high voltage angle steel towers according to claim 1, characterized in that, The adaptive cylinder drives the welding machine to move along the shape trajectory of the angle steel body connection, so that the welding head of the welding machine always stays in contact with the angle steel body connection.

5. The low-temperature welding insulation device for ultra-high voltage angle steel towers according to claim 1, characterized in that, The sliding block is driven by an electric slider to move within the annular groove.

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