A metal guardrail welding device

Abstract

The present application relates to the field of welding technology, and specifically discloses a metal guardrail welding device, which includes a machine body, a two-axis movable platform, and a welding gun fixedly connected to the two-axis movable platform and having an arc sensor built in. Conveying rollers for supporting and conveying cross bars are arranged on both sides of the machine body; a clamping block is arranged on the machine body for sliding in the vertical direction, a stopper is hinged on the top of the clamping block and on the side facing away from the moving direction of the cross tube, a receiving cavity is provided in the clamping block, a sodium sulfate decahydrate layer is accommodated in the receiving cavity, a plurality of heat conducting plates are arranged in the clamping block, a lifting assembly for lifting the clamping block and a flip assembly for controlling the rotation of the stopper are arranged on the machine body; a cooling pipe longer than the cross tube is arranged on the machine body, an adjusting assembly for adjusting the cross tube to be inserted into the cooling pipe and a feeding assembly for conveying the vertical tube to the clamping block are arranged on the machine body. The present application has the effect of performing one-time welding on a total of eight sides at both ends of the vertical tube, and reduces the occurrence of the phenomenon of the welding gun welding through the workpiece.

Description

Technical Field

[0001] This application relates to the field of welding technology, and in particular, to a metal guardrail welding device. Background Art

[0002] The road guardrail welding device is a professional equipment for welding road guardrails, which is widely used in many fields, such as highways, urban roads, bridges, tunnels, etc. These devices have greatly improved the production efficiency and quality of road guardrails.

[0003] When welding the Figure 6 shown guardrail, the vertical pipes (91) and horizontal pipes (92) of the guardrail are prefabricated and welded through the welding device in the factory building, and the columns (93) are manually installed on site and the prefabricated guardrail parts are also connected to the columns (93). When welding the horizontal pipes (92) and vertical pipes (91), it is mainly welded by an automatic welding torch. The welding torch can be installed on a robotic arm or a multi-axis moving platform, and the horizontal pipes (92) and vertical pipes (91) are fixed on the machine body, and then the welding torch sequentially performs welding operations on the vertical pipes (91).

[0004] Regarding the above related technologies, the inventor believes that there are the following defects: Whether it is the welding torch on the robotic arm or the welding torch on the multi-axis moving platform, when welding the workpiece, due to the self-angle limitation of the robotic arm or multi-axis moving platform and the position limitation of the machine body and vertical pipe, it is impossible to complete the welding of the four sides of the workpiece at one time. Generally, after one welding, the entire guardrail needs to be turned over for welding at another angle, with low efficiency, or the final product is incompletely welded. However, the stability and sealing performance of the incompletely welded guardrail are both poor, and phenomena such as fracture at the connection between the vertical pipe and the horizontal pipe and rust inside the vertical pipe are likely to occur after a long service life; at the same time, when welding multiple sides of a thinner workpiece, the welding time is longer, and the welding torch is likely to weld through the workpiece, thereby affecting the welding quality. Summary of the Invention

[0005] In order to improve the problem that it is difficult for the welding torch to weld the total eight sides at both ends of the vertical pipe at one time, and the welding torch is likely to weld through the thinner horizontal pipe and vertical pipe, this application provides a metal guardrail welding device.

[0006] A metal guardrail welding device provided by this application adopts the following technical solutions:

[0007] A metal guardrail welding device, comprising a machine body, a plurality of double-axis moving platforms arranged on the machine body, and a welding torch with an arc sensor built therein fixed to the double-axis moving platform, characterized in that: there are four double-axis moving platforms evenly arranged on both sides of the machine body, and the initial positions of the two welding torches on the same side of the machine body are arranged on both sides of the vertical pipe to be welded and are respectively located at the highest and lowest positions of the vertical pipe to be welded, and conveying rollers for supporting and conveying the horizontal pipe are arranged on both sides of the machine body;

[0008] A clamping block is slidably arranged on the machine body in the vertical direction. One side of the top end of the clamping block, which is opposite to the moving direction of the horizontal pipe, is hinged with a stop block. A receiving cavity is formed in the clamping block, and a sodium sulfate decahydrate layer is accommodated in the receiving cavity. A plurality of heat conducting plates are arranged in the clamping block. The heat conducting plates penetrate through the sodium sulfate decahydrate layer and both opposite ends of the heat conducting plates are fixedly connected to the inner wall of the clamping block. The clamping block is located at the welding point close to the vertical pipe, and both the clamping block and the stop block are made of aluminum alloy. An elevating assembly for elevating the clamping block and a flipping assembly for controlling the rotation of the stop block are arranged on the machine body;

[0009] A cooling pipe with a length longer than that of the horizontal pipe is arranged on the machine body. The cooling pipe is in tight contact with the inner side wall of the horizontal pipe. An adjusting assembly for adjusting the horizontal pipe to be sleeved on the cooling pipe is arranged on the machine body. A feeding assembly for conveying the vertical pipe into the clamping block is also arranged on the machine body.

[0010] By adopting the above technical solution, the horizontal pipe is placed on the conveying roller, and the vertical pipe is conveyed into the clamping block through the feeding assembly. Then, the lifting assembly raises the clamping block, and at the same time, the flipping assembly flips the baffle. When the clamping block moves to the highest position, the baffle presses the vertical pipe. Then, the double-axis moving table controls the welding torch to move, that is, the welding torch located below on the same side moves upward for welding first, and the welding torch located above moves downward for welding. Then, the two welding torches move horizontally for welding until all four sides of the vertical pipe are welded. Then, the welding torch returns along the original path. At this time, one vertical pipe is welded. The flipping assembly controls the baffle to open, and then the conveying roller rotates to move the next welding position of the horizontal pipe to the welding station. During this process, the vertical pipe in the clamping block also moves out of the clamping block along with the horizontal pipe. Subsequently, the lifting assembly controls the clamping block to descend, and then the above steps are repeated to weld the subsequent vertical pipes and horizontal pipes in sequence. When the welding torch is welding, the arc sensor built in the welding torch also detects the state of the welding torch in real time. When the situation of welding through occurs, the arc sensor can detect the change of the arc to facilitate reminding the staff. When the welding torch is welding, the clamping block made of aluminum alloy material can absorb the heat at the welding part of the vertical pipe with high efficiency. When the welding torch operates for a long time and the clamping block absorbs too much heat, the sodium sulfate decahydrate layer in the clamping block will gradually lose crystal water and absorb a large amount of heat, and the higher the temperature, the faster the dehydration, thereby effectively suppressing the temperature rise of the clamping block and effectively avoiding the vertical pipe from being welded through. Also, since the dehydration reaction of sodium sulfate decahydrate is a reversible reaction, after the entire welding operation is completed, the clamping block gradually cools down. At this time, the combination speed of sodium sulfate and water accelerates, and sodium sulfate decahydrate is re-formed. Before the horizontal pipe is inserted into or removed from the cooling pipe, the adjusting assembly adjusts the cooling pipe to make the horizontal pipe enter and exit smoothly. During the welding process, the relatively long cooling pipe effectively cools the horizontal pipe, and the cooling pipe also further fixes the horizontal pipe.

[0011] Optionally, the adjusting assembly includes two adjusting plates elastically hinged at both ends of the cooling pipe respectively, a locking plate slidably arranged on the machine body and located directly below the adjusting plate, a pressing block fixedly connected to the side of the locking plate facing the conveying direction of the horizontal pipe, an elastic telescopic rod arranged at the bottom of the adjusting plate, and a slot opened on the locking plate and adapted to be inserted with the adjusting plate. The side of the pressing block away from the locking plate is inclined gradually from the bottom to the top of the pressing block towards the direction close to the pressing block. The side of the locking plate away from the pressing block is longer than the length of the adjusting plate. And when the elastic telescopic rod is in a free state, the top of the pressing block is higher than the highest point of the conveying roller. When the adjusting plate is in a free state, the adjusting plate is in a vertical state and at this time the adjusting plate can only be flipped towards the conveying direction of the horizontal pipe by an external force.

[0012] By adopting the above technical solution, when the horizontal pipe is driven by the conveying roller and is about to be sleeved on the cooling pipe, the horizontal pipe presses the pressing block, causing the pressing block to move downward, the elastic telescopic rod to contract, and further causing the locking plate to move downward. At this time, the locking plate disengages from the locking of the adjusting plate. When the horizontal pipe continues to be conveyed to the adjusting plate, the horizontal pipe pushes the adjusting plate to rotate until the horizontal pipe is successfully sleeved on the cooling pipe. At this time, one end of the cooling pipe is supported by the horizontal pipe, and the other end is still supported by the non-rotated adjusting plate. When the horizontal pipe is completely located on the cooling pipe, the horizontal pipe does not abut against the adjusting plate. At this time, the adjusting plate rotates back to be perpendicular to the cooling pipe under the influence of the elastic force. When the horizontal pipe moves to disengage from abutting against the locking plate, the locking plate moves upward due to the elongation of the elastic telescopic rod until the slot of the locking plate is reinserted into the adjusting plate. When the horizontal pipe continues to move, the adjusting component at the end opposite to the moving direction of the horizontal pipe also undergoes the same process as described above to facilitate the detachment of the horizontal pipe.

[0013] Optionally, an inert gas detector is fixedly connected at the welding station inside the cooling pipe, and a ventilation hole is provided on the side of the cooling pipe close to the welding torch opposite to the inert gas detector.

[0014] By adopting the above technical solution, when the welding torch is welding, when the horizontal pipe is accidentally welded through by the welding torch, the inert gas (such as helium, argon, etc.) generated during the welding process of the welding torch enters the ventilation hole from the welded-through gap and enters the inert gas detector through the ventilation hole, so as to remind the staff that the horizontal pipe is welded through. When the arc sensor of the welding torch fluctuates and the inert gas detector does not detect inert gas, it means that the vertical pipe is welded through, that is, the arc sensor of the welding torch and the inert gas detector cooperate with each other to further accurately locate the welded-through position.

[0015] Optionally, a heat dissipation plate is horizontally fixedly connected inside the cooling pipe, and the heat dissipation plate is in a wavy shape. A blower is fixedly connected to the machine body obliquely above the end of the cooling pipe away from the welding torch, and the air outlet of the blower is inclined and aligned with the cooling pipe.

[0016] By adopting the above technical solution, during welding, the blower continuously blows air into the cooling pipe. Part of the heat on the cooling pipe is carried away by the cooling air. At the same time, part of the heat on the cooling pipe is also conducted to the heat dissipation plate. The wavy heat dissipation plate provides a large contact area, enabling the cooling air to fully dissipate heat from the heat dissipation plate, further improving the heat dissipation effect of the cooling pipe, and thus improving the heat dissipation effect of the horizontal pipe. When a part of the horizontal pipe begins to disengage from the cooling pipe, at this time, the horizontal pipe is completely welded, and the horizontal pipe blocks the air blown by the blower, that is, the blower directly cools the surface of the horizontal pipe, thereby accelerating the cooling speed of the welded finished product.

[0017] Optionally, a high-temperature water-permeable cotton embedded with reinforcing ribs is fixedly connected inside the clamping block. Each side of the high-temperature water-permeable cotton is parallel to the side wall of the clamping block opposite thereto, and a plurality of heat dissipation fins are also fixedly connected to the outer wall of the clamping block.

[0018] By adopting the above technical solution, part of the water after the dehydration of the sodium sulfate decahydrate layer is absorbed by the high-temperature water-permeable cotton, and part enters the cavity of the clamping block on the side of the high-temperature water-permeable cotton away from the sodium sulfate decahydrate layer. When the welding stops, the dehydration speed of the sodium sulfate decahydrate is less than the hydration reaction speed. At this time, the water in the high-temperature water-permeable cotton is absorbed by the sodium sulfate decahydrate more evenly. When the water vapor in the clamping block becomes liquid water, the high-temperature water-permeable cotton also absorbs the liquid water due to capillary action, thereby providing a water source for the sodium sulfate decahydrate layer; when the clamping block absorbs heat, the heat dissipation fins can accelerate the heat dissipation of the clamping block, and since the clamping block is always in the process of cyclic lifting and lowering, and the movement will also accelerate the contact between the clamping block and the air flow, thereby further accelerating the heat dissipation speed of the clamping block and the heat dissipation fins.

[0019] Optionally, the lifting assembly includes a lifting plate fixedly connected to the machine body, a rack fixedly connected to one end of the lifting plate close to the vertical pipe, a lifting table slidably connected to the lifting plate, a lifting motor fixedly connected to the lifting table, and a lifting gear fixedly connected to the output end of the lifting motor. The lifting gear is meshed and connected with the rack, and the clamping block is fixedly connected to the lifting table.

[0020] By adopting the above technical solution, when the clamping block needs to rise, the lifting motor drives the lifting gear to rotate. The rotating lifting gear drives the lifting table to rise vertically along the lifting plate due to the action of the rack, thereby raising the clamping block; conversely, when the lifting motor rotates in reverse, the clamping block descends. The structure is simple and the accuracy is relatively high.

[0021] Optionally, the flipping assembly includes a driving gear meshed with the rack, a transmission shaft coaxially fixed to the driving gear, a driving bevel gear coaxially fixed to one end of the transmission shaft away from the driving gear, a first hinge shaft rotatably connected to the clamping block, a driven bevel gear coaxially fixed to the first hinge shaft, and a second hinge shaft elastically hinged to the stop block. The driving bevel gear is meshed and connected with the driven bevel gear, and the first hinge shaft and the second hinge shaft are fixedly connected to each other. When the clamping block moves from the lowest position to the highest position, the stop block gradually flips towards the direction close to the clamping block. When the stop block is in a free state and the clamping block is in the highest position, the stop block fits with the clamping block.

[0022] By adopting the above technical solution, when the lifting motor drives the lifting gear to rotate and the clamping block rises, the driving gear also rises vertically. Since the driving gear also meshes with the rack, the driving gear also rotates. The rotation of the driving gear drives the transmission shaft to rotate, and the transmission shaft drives the driving bevel gear to rotate. The driving bevel gear drives the driven bevel gear to rotate, and the driven bevel gear drives the first hinge shaft to rotate. Since the second hinge shaft is fixedly connected to the first hinge shaft, the second hinge shaft rotates with the first hinge shaft as the rotation axis, thereby closing the stopper. At this time, the vertical pipe is fixed by the clamping block and the stopper; when the fixed vertical rod is welded, the conveying roller conveys the horizontal pipe to move, and the vertical pipe welded on the horizontal pipe also moves accordingly. The moving vertical pipe then pushes the stopper to rotate, that is, the second hinge shaft rotates, but the first hinge shaft does not move. When the vertical rod completely disengages from the stopper, the second hinge shaft rotates again under the elastic force, thereby closing the stopper on the clamping block. Then the lifting motor drives the clamping block to descend. During this process, the first hinge shaft rotates in the reverse direction of the previous rotation direction, thereby opening the stopper, that is, the stopper gradually closes when the clamping block rises, the stopper opens when the vertical pipe disengages from the clamping and the first hinge shaft does not move, the second hinge shaft drives the stopper to close when the vertical pipe completely disengages from the stopper and the first hinge shaft does not move, and the stopper gradually closes when the clamping block descends. The structure is relatively simple and only one power source, the lifting motor, is required to solve the lifting of the clamping block and the closing of the stopper.

[0023] Optionally, the feeding assembly includes a conveyor belt fixedly connected to the machine body and an electric push rod fixedly connected to the machine body and located above the conveyor belt. The conveyor belt is perpendicular to the moving direction of the horizontal pipe, and one end of the conveyor belt is located inside the machine body and the other end extends outside the machine body.

[0024] By adopting the above technical solution, the conveyor belt drives the vertical pipe to move towards the machine body. After the vertical pipe moves to the designated position, the electric push rod quickly pushes the vertical pipe into the clamping block, and the feeding of the vertical pipe can be completed, and the feeding efficiency is relatively high.

[0025] Optionally, a baffle is fixedly connected to one end of the bottom surface of the clamping block close to the stopper, and the height of the baffle is not lower than the moving height of the clamping block.

[0026] By adopting the above technical solution, after the clamping block rises, the remaining horizontal pipes staying on the conveyor belt are blocked by the baffle, avoiding the baffle on the conveyor belt accidentally moving below the raised clamping block and causing accidents in subsequent feeding.

[0027] Optionally, a guiding frame is fixedly connected to one end of the machine body where the cooling pipe faces the moving direction of the horizontal pipe. The guiding frame is inserted and adapted to the horizontal pipe, and the end of the guiding frame away from the cooling pipe is flared.

[0028] By adopting the above technical solution, the flared guide frame corrects the direction of the horizontal pipe during the movement, and it is easier to sleeved the horizontal pipe onto the cooling pipe. At the same time, the guide frame also makes the horizontal pipe move more stably.

[0029] In summary, the present application includes at least one of the following beneficial technical effects:

[0030] 1. During the welding of the welding torch, the clamping block made of aluminum alloy material can efficiently absorb the heat at the welding joint of the vertical pipe. When the welding torch operates for a long time and the clamping block absorbs too much heat, the sodium sulfate decahydrate layer in the clamping block will gradually lose its crystal water and absorb a large amount of heat. Moreover, the higher the temperature, the faster the dehydration. Thus, it effectively inhibits the temperature rise of the clamping block and effectively avoids the vertical pipe from being welded through. Also, since the dehydration reaction of sodium sulfate decahydrate is a reversible reaction, after the entire welding operation is completed, the clamping block gradually cools down. At this time, the combination speed of sodium sulfate and water speeds up, and sodium sulfate decahydrate is re-formed. Compared with air cooling, that is, directly blowing cooling air at the weld, the cooling air is likely to change the fluidity and solidification behavior of the molten pool, resulting in uneven weld formation. If circulating water cooling is used, a huge cooling system and complex water cooling pipes are required, which is not convenient for the vertical pipe to move up and down and enter and exit the clamping block. Moreover, when the ambient temperature is relatively low, the water cooling pipe with too low temperature will even inhibit the formation of the molten pool. At the same time, the rapid heat dissipation will also make it difficult to maintain the stable state of the high temperature required for the molten pool, thus affecting the final welding effect.

[0031] 2. The fan continuously blows air into the cooling pipe. Part of the heat on the cooling pipe is carried away by the cooling air. At the same time, part of the heat on the cooling pipe is also conducted to the heat dissipation plate. The wavy heat dissipation plate provides a large contact area, enabling the cooling air to fully dissipate heat from the heat dissipation plate, further improving the heat dissipation effect of the cooling pipe, and thus improving the heat dissipation effect of the horizontal pipe.

[0032] 3. When the horizontal pipe is driven by the conveying roller and is about to be sleeved onto the cooling pipe, the horizontal pipe presses the pressing block, causing the pressing block to move downward, and the elastic telescopic rod contracts, thereby causing the locking plate to move downward. At this time, the locking plate disengages from the locking of the adjusting plate. When the horizontal pipe continues to be conveyed to the adjusting plate, the horizontal pipe pushes the adjusting plate to rotate until the horizontal pipe is successfully sleeved onto the cooling pipe. At this time, one end of the cooling pipe is supported by the horizontal pipe, and the other end is still supported by the unrotated adjusting plate. After the horizontal pipe is completely located on the cooling pipe, the horizontal pipe does not abut against the adjusting plate. At this time, the adjusting plate rotates back to be perpendicular to the cooling pipe under the influence of the elastic force. When the horizontal pipe moves to disengage from abutting against the locking plate, the locking plate moves upward under the elongation of the elastic telescopic rod until the slot of the locking plate is re-inserted into the adjusting plate. When the horizontal pipe continues to move, the adjusting component at the end facing away from the moving direction of the horizontal pipe also undergoes the same process as described above to facilitate the detachment of the horizontal pipe.

[0033] 4. When the horizontal pipe is welded through by the welding torch due to an accident, the inert gas generated during the welding process of the welding torch enters the ventilation holes through the gaps where the pipe is welded through, and then enters the inert gas detector through the ventilation holes, so as to remind the staff that the horizontal pipe has been welded through. When the arc sensor of the welding torch fluctuates but the inert gas detector does not detect inert gas, it means that the vertical pipe has been welded through. That is, the arc sensor of the welding torch and the inert gas detector cooperate with each other to further accurately locate the position of the welding through. Brief Description of the Drawings

[0034] Figure 1 is the overall structural schematic diagram of the embodiment of the present application;

[0035] Figure 2 is the schematic diagram showing the internal structures of the clamping block and the stopper and the clamping block and the stopper of the present application;

[0036] Figure 3 is along Figure 1 the partial sectional structural schematic diagram taken along the line A-A in

[0037] Figure 4 is Figure 3 the enlarged structural schematic diagram of part B in

[0038] Figure 5 is the partial schematic diagram of the present application mainly showing the lifting assembly, the flipping assembly, the clamping block and the conveyor belt;

[0039] Figure 6 is the overall structural schematic diagram of the guardrail of the present application.

[0040] Reference Signs: 1, machine body; 11, double-axis moving table; 12, welding torch; 13, fan; 14, guiding frame; 2, conveying roller; 31, clamping block; 311, accommodating cavity; 312, sodium sulfate decahydrate layer; 313, heat conducting plate; 314, high-temperature water-permeable cotton; 315, heat dissipation fins; 316, baffle; 32, stopper; 4, lifting assembly; 41, lifting plate; 42, rack; 43, lifting table; 44, lifting motor; 45, lifting gear; 5, flipping assembly; 51, driving gear; 52, transmission shaft; 53, driving bevel gear; 54, first hinge shaft; 55, driven bevel gear; 56, second hinge shaft; 6, cooling pipe; 61, inert gas detector; 62, ventilation hole; 63, heat dissipation plate; 64, accommodating groove; 7, adjusting assembly; 71, adjusting plate; 72, locking plate; 73, pressing block; 74, elastic telescopic rod; 75, slot; 8, feeding assembly; 81, conveyor belt; 82, electric push rod; 91, vertical pipe; 92, horizontal pipe; 93, column. Detailed Description of the Embodiment

[0041] The following further describes the present application in detail with reference to the attached Figures 1-5 drawings.

[0042] An embodiment of the present application discloses a metal guardrail welding device. Referring to Figures 1 - 5 , a metal guardrail welding device includes a machine body 1, four double-axis moving platforms 11 arranged on the machine body 1, and a welding torch 12 with an arc sensor built therein and fixed on the double-axis moving platform 11. The four double-axis moving platforms 11 are arranged in two columns on both sides of the machine body 1. The two welding torches 12 on the same side of the machine body 1 are initially arranged on both sides of the vertical pipe 91 to be welded and are respectively located at the highest and lowest positions of the vertical pipe 91 to be welded. Among them, the initial position of the welding torch 12 on the side of the vertical pipe 91 facing the conveying direction of the horizontal pipe 92 is at the lowest position, and the welding torch 12 on the other side is at the highest position. A plurality of conveying rollers 2 for supporting and conveying the horizontal pipe 92 are rotatably connected to both sides of the machine body 1. A clamping block 31 is slidably arranged on the machine body 1 in the vertical direction. One side of the top of the clamping block 31 facing away from the moving direction of the horizontal pipe 92 is hinged with a stop block 32. An accommodation cavity 311 is opened in the clamping block 31. A sodium sulfate decahydrate layer 312 or a magnesium sulfate heptahydrate layer is accommodated in the accommodation cavity 311. In this application, it is the sodium sulfate decahydrate layer 312 with stronger heat absorption capacity. A plurality of heat conducting plates 313 are arranged in the clamping block 31. The heat conducting plates 313 penetrate through the sodium sulfate decahydrate layer 312 and both opposite ends of the heat conducting plates 313 are fixedly connected to the inner wall of the clamping block 31. The clamping block 31 is located at the welding point close to the vertical pipe 91, and both the clamping block 31 and the stop block 32 are made of aluminum alloy. In this application, there is also a sodium sulfate decahydrate layer 312 and heat conducting plates 313 in the stop block 32. A lifting assembly 4 for lifting the clamping block 31 and a flipping assembly 5 for controlling the rotation of the stop block 32 are arranged on the machine body 1. An aluminum alloy cooling pipe 6 with a length longer than that of the horizontal pipe 92 is movably arranged on the machine body 1. The cooling pipe 6 is in tight contact with the inner side wall of the horizontal pipe 92. An adjusting assembly 7 for adjusting the horizontal pipe 92 to be sleeved on the cooling pipe 6 is arranged on the machine body 1. A feeding assembly 8 for conveying the vertical pipe 91 into the clamping block 31 is also arranged on the machine body 1.

[0043] Place the horizontal pipe 92 on the conveying roller 2, convey the vertical pipe 91 into the clamping block 31 through the feeding assembly 8, then the lifting assembly 4 raises the clamping block 31, and at the same time the flipping assembly 5 flips the stop block 32. When the clamping block 31 moves to the highest position, the stop block 32 presses the vertical pipe 91. Then the double-axis moving table 11 controls the movement of the welding torch 12, that is, the welding torch 12 below on the same side moves up for welding first, and the welding torch 12 above moves down for welding, and then the two welding torches 12 move horizontally for welding until all four sides of the vertical pipe 91 are welded. Then the welding torch 12 returns along the original path. At this time, the welding of one vertical pipe 91 is completed. The flipping assembly 5 controls the stop block 32 to open, and then the conveying roller 2 rotates to move the next welding position of the horizontal pipe 92 to the welding station. During this process, the vertical pipe 91 in the clamping block 31 also moves out of the clamping block 31 along with the horizontal pipe 92. Subsequently, the lifting assembly 4 controls the clamping block 31 to descend, and then repeats the above steps to weld the subsequent vertical pipes 91 and horizontal pipes 92 in sequence. When the welding torch 12 is welding, the arc sensor built in the welding torch 12 also detects the state of the welding torch 12 in real time. When the situation of welding through occurs, the arc sensor can detect the change of the arc to facilitate reminding the staff. When the welding torch 12 is welding, the clamping block 31 made of aluminum alloy material can efficiently absorb the heat at the welding part of the vertical pipe 91. And when the welding torch 12 operates for a long time and the clamping block 31 absorbs too much heat, the sodium sulfate decahydrate layer 312 in the clamping block 31 will gradually lose crystal water and absorb a large amount of heat, and the higher the temperature, the faster the dehydration, thereby effectively inhibiting the temperature rise of the clamping block 31 and effectively avoiding the vertical pipe 91 from being welded through. Also, because the dehydration reaction of sodium sulfate decahydrate is a reversible reaction, after the entire welding operation is completed, the clamping block 31 gradually cools down, and at this time the combination speed of sodium sulfate and water speeds up to re-form sodium sulfate decahydrate. Before the horizontal pipe 92 is inserted into or removed from the cooling pipe 6, the adjusting assembly 7 adjusts the cooling pipe 6 to make the horizontal pipe 92 enter and exit smoothly. During the welding process, the longer cooling pipe 6 effectively cools the horizontal pipe 92, and the cooling pipe 6 also further fixes the horizontal pipe 92.

[0044] Refer to Figure 3 and Figure 4, the adjusting assembly 7 includes two adjusting plates 71 respectively elastically hinged at both ends of the cooling pipe 6, a locking plate 72 slidably arranged on the machine body 1 and located directly below the adjusting plate 71, a pressing block 73 fixedly connected to one side of the locking plate 72 facing the conveying direction of the horizontal pipe 92, an elastic telescopic rod 74 arranged at the bottom of the adjusting plate 71, and a slot 75 opened on the locking plate 72 and adapted to be inserted with the adjusting plate 71. The side of the pressing block 73 away from the locking plate 72 is inclined gradually from the bottom to the top of the pressing block 73 towards the direction close to the pressing block 73. The side of the locking plate 72 away from the pressing block 73 is longer than the length of the adjusting plate 71. And when the elastic telescopic rod 74 is in a free state, the top of the pressing block 73 is higher than the highest point of the conveying roller 2. When the adjusting plate 71 is in a free state, the adjusting plate 71 is in a vertical state and at this time the adjusting plate 71 can only be flipped towards the conveying direction of the horizontal pipe 92 by an external force. A receiving groove 64 for receiving the adjusting plate 71 is also opened on the bottom wall of the cooling pipe 6.

[0045] When the horizontal pipe 92 is driven by the conveying roller 2 and is about to be sleeved on the cooling pipe 6, the horizontal pipe 92 presses the pressing block 73, causing the pressing block 73 to move downward, and the elastic telescopic rod 74 contracts, thereby causing the locking plate 72 to move downward. At this time, the locking plate 72 releases the locking of the adjusting plate 71. When the horizontal pipe 92 continues to be conveyed to the position of the adjusting plate 71, the horizontal pipe 92 pushes the adjusting plate 71 to rotate until the adjusting plate 71 rotates into the receiving groove 64 and the horizontal pipe 92 is successfully sleeved on the cooling pipe 6. At this time, one end of the cooling pipe 6 is supported by the horizontal pipe 92, and the other end is still supported by the unrotated adjusting plate 71. After the horizontal pipe 92 is completely located on the cooling pipe 6, the horizontal pipe 92 does not abut against the adjusting plate 71. At this time, the adjusting plate 71 is rotated back to be perpendicular to the cooling pipe 6 under the influence of the elastic force. When the horizontal pipe 92 moves to be separated from abutting against the locking plate 72, the locking plate 72 moves upward under the elongation of the elastic telescopic rod 74 until the slot 75 of the locking plate 72 is re-inserted with the adjusting plate 71. When the horizontal pipe 92 continues to move, the adjusting assembly 7 at one end facing away from the moving direction of the horizontal pipe 92 also undergoes the same process as described above to facilitate the separation of the horizontal pipe 92.

[0046] Referring to Figure 3 , an inert gas detector 61 is fixedly connected inside the cooling pipe 6 at the welding station. The inert gas detector 61 can be a helium detector or an argon detector. The specific model of the inert gas detector 61 is actually installed according to the actual working conditions. A ventilation hole 62 is opened on the side of the cooling pipe 6 close to the welding torch 12 opposite to the inert gas detector 61. A heat dissipation plate 63 is horizontally fixedly connected inside the cooling pipe 6. The heat dissipation plate 63 can be made of copper or aluminum alloy. In this application, it is an aluminum alloy heat dissipation plate 63, and the heat dissipation plate 63 is in a wavy shape. A blower 13 is fixedly connected to the machine body 1 obliquely above the end of the cooling pipe 6 away from the welding torch 12, and the air outlet of the blower 13 is obliquely aligned with the cooling pipe 6.

[0047] When the welding torch 12 is welding, if the horizontal pipe 92 is accidentally welded through by the welding torch 12, the inert gas generated during the welding process of the welding torch 12 enters the ventilation hole 62 through the welded-through gap, and enters the inert gas detector 61 through the ventilation hole 62, so as to remind the staff that the horizontal pipe 92 has been welded through. When the arc sensor of the welding torch 12 fluctuates and the inert gas detector 61 does not detect inert gas, it means that the vertical pipe 91 has been welded through, that is, the arc sensor of the welding torch 12 and the inert gas detector 61 cooperate with each other to further accurately locate the welded-through position; at the same time, the fan 13 continuously blows air into the cooling pipe 6. Part of the heat on the cooling pipe 6 is carried away by the cooling air, and at the same time, part of the heat on the cooling pipe 6 is also conducted to the heat dissipation plate 63. The wavy heat dissipation plate 63 provides a large contact area, enabling the cooling air to fully dissipate heat from the heat dissipation plate 63, further improving the heat dissipation effect of the cooling pipe 6, and thus improving the heat dissipation effect of the horizontal pipe 92; when a part of the horizontal pipe 92 begins to separate from the cooling pipe 6, at this time, the welding of the horizontal pipe 92 is completed, and the horizontal pipe 92 blocks the air blown by the fan 13, that is, the fan 13 directly cools the surface of the horizontal pipe 92, thereby accelerating the cooling speed of the welded finished product, and the air flow blown by the fan 13 also takes away the remaining inert gas after passing through the inert gas detector 61 in the previous detection, and avoids the inert gas entering the cooling pipe 6 after the previous welding through from interfering with the subsequent welding operation.

[0048] Refer to Figure 2 , a high-temperature water-permeable cotton 314 embedded with reinforcing ribs is fixedly connected inside the clamping block 31. Each side of the high-temperature water-permeable cotton 314 is parallel to the side wall of the clamping block 31 opposite to it, and a plurality of heat dissipation fins 315 are also fixedly connected to the outer wall of the clamping block 31. Part of the water dehydrated from the sodium sulfate decahydrate layer 312 is absorbed by the high-temperature water-permeable cotton 314, and part enters the cavity of the clamping block 31 on the side of the high-temperature water-permeable cotton 314 away from the sodium sulfate decahydrate layer 312. When the welding stops, the dehydration speed of sodium sulfate decahydrate is less than the hydration reaction speed. At this time, the water in the high-temperature water-permeable cotton 314 is relatively evenly absorbed by sodium sulfate decahydrate. When the water vapor in the clamping block 31 becomes liquid water, the high-temperature water-permeable cotton 314 also absorbs the liquid water due to capillary action, thereby providing a water source for the sodium sulfate decahydrate layer 312; when the clamping block 31 absorbs heat, the heat dissipation fins 315 can accelerate the heat dissipation of the clamping block 31, and since the clamping block 31 is always in the process of cyclic lifting and lowering, and the movement will also accelerate the contact between the clamping block 31 and the air flow, thereby further accelerating the heat dissipation speed of the clamping block 31 and the heat dissipation fins 315.

[0049] Refer to Figure 5, the lifting assembly 4 includes a lifting plate 41 fixedly connected to the machine body 1, a rack 42 fixedly connected to one end of the lifting plate 41 close to the vertical pipe 91, a lifting table 43 slidably connected to the lifting plate 41, a lifting motor 44 fixedly connected to the lifting table 43, and a lifting gear 45 fixedly connected to the output end of the lifting motor 44. The lifting gear 45 is meshed and connected with the rack 42, and the clamping block 31 is fixedly connected to the lifting table 43. When the clamping block 31 needs to rise, the lifting motor 44 drives the lifting gear 45 to rotate. The rotating lifting gear 45 drives the lifting table 43 to rise vertically along the lifting plate 41 due to the action of the rack 42, thereby causing the clamping block 31 to rise. Conversely, when the lifting motor 44 rotates in reverse, the clamping block 31 descends. The structure is simple and has high precision.

[0050] Referring to Figure 5 , the flipping assembly 5 includes a driving gear 51 meshed and connected to the rack 42, a transmission shaft 52 coaxially fixedly connected to the driving gear 51, a driving bevel gear 53 coaxially fixedly connected to one end of the transmission shaft 52 away from the driving gear 51, a first hinge shaft 54 rotatably connected to the clamping block 31, a driven bevel gear 55 coaxially fixedly connected to the first hinge shaft 54, and a second hinge shaft 56 elastically hinged to the stop block 32. The driving bevel gear 53 is meshed and connected with the driven bevel gear 55, and the first hinge shaft 54 is fixedly connected to the second hinge shaft 56. When the clamping block 31 moves from the lowest position to the highest position, the stop block 32 gradually flips towards the direction close to the clamping block 31. When the stop block 32 is in a free state and the clamping block 31 is located at the highest position, the stop block 32 fits with the clamping block 31.

[0051] When the lifting motor 44 drives the lifting gear 45 to rotate and the clamping block 31 rises, the driving gear 51 also rises in the vertical direction. Since the driving gear 51 also meshes with the rack 42, the driving gear 51 also rotates. The rotation of the driving gear 51 drives the transmission shaft 52 to rotate, and the transmission shaft 52 drives the driving bevel gear 53 to rotate. The driving bevel gear 53 drives the driven bevel gear 55 to rotate, and the driven bevel gear 55 drives the first hinge shaft 54 to rotate. Since the second hinge shaft 56 is fixedly connected to the first hinge shaft 54, the second hinge shaft 56 rotates with the first hinge shaft 54 as the rotation axis, thereby closing the stopper 32. At this time, the vertical pipe 91 is fixed by the clamping block 31 and the stopper 32. After the fixed vertical rod is welded, the conveying roller 2 conveys the horizontal pipe 92 to move, and the vertical pipe 91 welded on the horizontal pipe 92 also moves accordingly. The moving vertical pipe 91 then pushes the stopper 32 to rotate, that is, the second hinge shaft 56 rotates, but the first hinge shaft 54 does not move. When the vertical rod completely disengages from the stopper 32, the second hinge shaft 56 rotates again under the elastic force, thereby closing the stopper 32 on the clamping block 31. Then the lifting motor 44 drives the clamping block 31 to descend. During this process, the first hinge shaft 54 rotates in the reverse direction of the previous rotation direction, thereby opening the stopper 32, that is, the stopper 32 gradually closes when the clamping block 31 rises, the stopper 32 opens and the first hinge shaft 54 does not move when the vertical pipe 91 disengages from the clamping, the second hinge shaft 56 drives the stopper 32 to close and the first hinge shaft 54 does not move when the vertical pipe 91 completely disengages from the stopper 32, and the stopper 32 gradually closes when the clamping block 31 descends. The structure is relatively simple and only one power source, the lifting motor 44, is required to solve the lifting of the clamping block 31 and the closing of the stopper 32.

[0052] Referring to Figure 1 and Figure 2 , the feeding assembly 8 includes a conveyor belt 81 fixedly connected to the machine body 1 and an electric push rod 82 fixedly connected to the machine body 1 and located above the conveyor belt 81. The conveyor belt 81 is perpendicular to the moving direction of the horizontal pipe 92. One end of the conveyor belt 81 is located inside the machine body 1 and the other end extends outside the machine body 1. The machine body 1 is also fixedly connected with a limiting plate, and the limiting plate is located above one end of the conveyor belt 81 inside the machine body 1; One end of the bottom surface of the clamping block 31 close to the stopper 32 is fixedly connected with a baffle 316, and the height of the baffle 316 is not lower than the moving height of the clamping block 31.

[0053] The conveyor belt 81 drives the vertical pipe 91 to move towards the direction close to the machine body 1. After the vertical pipe 91 moves to the designated position, the electric push rod 82 quickly pushes the vertical pipe 91 into the clamping block 31, and the feeding of the vertical pipe 91 can be completed, and the feeding efficiency is relatively high. After the clamping block 31 rises, the remaining horizontal pipes 92 staying on the conveyor belt 81 are blocked by the baffle 316, preventing the baffle 316 on the conveyor belt 81 from accidentally moving below the raised clamping block 31 and causing accidents in subsequent feeding.

[0054] Reference Figure 1 As shown in Figure 1 , at one end of the cooling pipe 6 of the machine body 1 facing the moving direction of the horizontal pipe 92, a guiding frame 14 is fixedly connected. The guiding frame 14 is inserted and adapted to the horizontal pipe 92, and the end of the guiding frame 14 away from the cooling pipe 6 is flared. The flared guiding frame 14 corrects the direction of the horizontal pipe 92 during the movement, makes it easier for the horizontal pipe 92 to be sleeved on the cooling pipe 6, and at the same time makes the movement of the horizontal pipe 92 more stable.

[0055] The implementation principle of a metal guardrail welding device according to an embodiment of the present application is as follows: Place the horizontal pipe 92 on the conveying roller 2, and the conveying roller 2 intermittently conveys the horizontal pipe 92. The horizontal pipe 92 presses the pressing block 73, causing the pressing block 73 to move downward, and the elastic telescopic rod 74 contracts, thereby causing the locking plate 72 to move downward. At this time, the locking plate 72 disengages from the locking of the adjusting plate 71. When the horizontal pipe 92 continues to be conveyed to the adjusting plate 71, the horizontal pipe 92 pushes the adjusting plate 71 to rotate until the adjusting plate 71 rotates into the receiving groove 64 and the horizontal pipe 92 is successfully sleeved on the cooling pipe 6. At this time, one end of the cooling pipe 6 is supported by the horizontal pipe 92, and the other end is continuously supported by the non-rotated adjusting plate 71; the conveyor belt 81 drives the vertical pipe 91 to move in the direction close to the machine body 1. After the vertical pipe 91 moves to the designated position, the electric push rod 82 quickly pushes the vertical pipe 91 into the clamping block 31 to complete the feeding of the vertical pipe 91; then the lifting motor 44 drives the lifting gear 45 to rotate, and the rotating lifting gear 45 drives the lifting table 43 to rise vertically along the lifting plate 41 due to the action of the rack 42, thereby causing the clamping block 31 to rise until the clamping block 31 rises to the designated position and the stopper 32 is just completely closed; then the double-axis moving table 11 controls the welding torch 12 to move, that is, the welding torch 12 below on the same side moves upward for welding first, the welding torch 12 above moves downward for welding, and then the two welding torches 12 move horizontally for welding. After the four sides of the vertical pipe 91 are all welded, the welding torch 12 returns along the original path.

[0056] During the welding process, the clamping block 31 made of aluminum alloy can efficiently absorb the heat at the welding joint of the vertical pipe 91. When the welding torch 12 operates for a long time and the clamping block 31 absorbs too much heat, the sodium sulfate decahydrate layer 312 in the clamping block 31 will gradually lose its crystal water and absorb a large amount of heat. Moreover, the higher the temperature, the faster the dehydration, thereby effectively inhibiting the temperature rise of the clamping block 31 and effectively preventing the vertical pipe 91 from being welded through. Also, since the dehydration reaction of sodium sulfate decahydrate is a reversible reaction, after the entire welding operation is completed, the clamping block 31 gradually cools down. At this time, the combination speed of sodium sulfate and water accelerates, and sodium sulfate decahydrate is re-formed, effectively avoiding the phenomenon of the vertical pipe 91 being welded through; the blower 13 continuously blows air into the cooling pipe 6, and part of the heat on the cooling pipe 6 is carried away by the cooling air. At the same time, part of the heat on the cooling pipe 6 is also conducted to the heat dissipation plate 63. The wavy heat dissipation plate 63 provides a large contact area, enabling the cooling air to fully dissipate heat from the heat dissipation plate 63, further improving the heat dissipation effect of the cooling pipe 6, and thus improving the heat dissipation effect of the horizontal pipe 92; when the horizontal pipe 92 is welded through by the welding torch 12 due to an accident, the inert gas generated during the welding process of the welding torch 12 enters the vent hole 62 from the welded-through gap and enters the inert gas detector 61 through the vent hole 62, so as to remind the staff that the horizontal pipe 92 has been welded through. When the arc sensor of the welding torch 12 fluctuates but the inert gas detector 61 does not detect inert gas, it indicates that the vertical pipe 91 has been welded through, that is, the arc sensor of the welding torch 12 and the inert gas detector 61 cooperate with each other to further accurately locate the welded-through position.

[0057] The above are all preferred embodiments of this application, and the protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A metal guardrail welding device, comprising a machine body (1), a plurality of double-axis moving platforms (11) arranged on the machine body (1), and a welding torch (12) with an arc sensor built therein and fixedly connected to the double-axis moving platform (11), characterized in that: The double-axis moving platform (11) has four and is evenly distributed on both sides of the body (1). The initial positions of the two welding torches (12) on the same side of the body (1) are distributed on both sides of the vertical pipe (91) to be welded and are respectively located at the highest and lowest positions of the vertical pipe (91) to be welded. Conveyor rollers (2) for supporting and conveying the horizontal pipe (92) are arranged on both sides of the body (1); A clamping block (31) is slidably arranged on the body (1) in the vertical direction. A stop block (32) is hinged to one side of the top end of the clamping block (31) facing away from the moving direction of the horizontal pipe (92). A receiving cavity (311) is formed in the clamping block (31). A sodium sulfate decahydrate layer (312) is received in the receiving cavity (311). A plurality of heat conducting plates (313) are arranged in the clamping block (31). The heat conducting plates (313) penetrate through the sodium sulfate decahydrate layer (312) and both opposite ends of the heat conducting plates (313) are fixedly connected to the inner wall of the clamping block (31). The clamping block (31) is located at the welding point close to the vertical pipe (91). Both the clamping block (31) and the stop block (32) are made of aluminum alloy. A lifting assembly (4) for lifting the clamping block (31) and a flipping assembly (5) for controlling the rotation of the stop block (32) are arranged on the body (1); A cooling pipe (6) with a length longer than that of the horizontal pipe (92) is arranged on the body (1). The cooling pipe (6) is in tight contact with the inner side wall of the horizontal pipe (92). An adjusting assembly (7) for adjusting the horizontal pipe (92) to be sleeved on the cooling pipe (6) is arranged on the body (1). A feeding assembly (8) for conveying the vertical pipe (91) into the clamping block (31) is further arranged on the body (1); The adjusting assembly (7) includes two adjusting plates (71) respectively elastically hinged at both ends of the cooling pipe (6), a locking plate (72) slidably arranged on the body (1) and located directly below the adjusting plate (71), a pressing block (73) fixedly connected to the side of the locking plate (72) facing the conveying direction of the horizontal pipe (92), an elastic telescopic rod (74) arranged at the bottom of the adjusting plate (71), and a slot (75) formed in the locking plate (72) and adapted to be inserted with the adjusting plate (71). The side of the pressing block (73) away from the locking plate (72) is inclined gradually from the bottom to the top of the pressing block (73) towards the direction close to the pressing block (73). The side of the locking plate (72) away from the pressing block (73) is longer than the length of the adjusting plate (71). When the elastic telescopic rod (74) is in a free state, the top of the pressing block (73) is higher than the highest point of the conveyor roller (2). When the adjusting plate (71) is in a free state, the adjusting plate (71) is in a vertical state and at this time the adjusting plate (71) can only be flipped towards the conveying direction of the horizontal pipe (92) by an external force; An inert gas detector (61) is fixedly connected inside the cooling pipe (6) at the welding station, and a ventilation hole (62) is provided on one side of the cooling pipe (6) close to the welding torch (12) opposite to the inert gas detector (61).

2. The metal guardrail welding device according to claim 1, characterized in that: A heat dissipation plate (63) is horizontally and fixedly connected inside the cooling pipe (6), and the heat dissipation plate (63) is wavy. A blower (13) is fixedly connected to the machine body (1) obliquely above one end of the cooling pipe (6) away from the welding torch (12), and the air outlet of the blower (13) is obliquely aligned with the cooling pipe (6).

3. A metal guardrail welding device according to claim 1, characterized in that: A high-temperature water-permeable cotton (314) embedded with reinforcing ribs is fixedly connected inside the clamping block (31). Each side of the high-temperature water-permeable cotton (314) is parallel to the side wall of the clamping block (31) opposite thereto, and a plurality of heat dissipation fins (315) are also fixedly connected to the outer wall of the clamping block (31).

4. A metal guardrail welding device according to claim 1, characterized in that: The lifting assembly (4) includes a lifting plate (41) fixedly connected to the machine body (1), a rack (42) fixedly connected to one end of the lifting plate (41) close to the vertical pipe (91), a lifting table (43) slidably connected to the lifting plate (41) in the vertical direction, a lifting motor (44) fixedly connected to the lifting table (43), and a lifting gear (45) fixedly connected to the output end of the lifting motor (44). The lifting gear (45) is meshed and connected with the rack (42), and the clamping block (31) is fixedly connected to the lifting table (43).

5. The metal guardrail welding device according to claim 4, characterized in that: The flipping assembly (5) includes a driving gear (51) meshed with the rack (42), a transmission shaft (52) coaxially fixedly connected to the driving gear (51), a driving bevel gear (53) coaxially fixedly connected to one end of the transmission shaft (52) away from the driving gear (51), a first hinge shaft (54) rotatably connected to the clamping block (31), a driven bevel gear (55) coaxially fixedly connected to the first hinge shaft (54), and a second hinge shaft (56) elastically hinged to the stop block (32). The driving bevel gear (53) is meshed and connected with the driven bevel gear (55), and the first hinge shaft (54) is fixedly connected to the second hinge shaft (56). When the clamping block (31) moves from the lowest position to the highest position, the stop block (32) gradually flips towards the direction close to the clamping block (31). When the stop block (32) is in a free state and the clamping block (31) is located at the highest position, the stop block (32) fits with the clamping block (31).

6. The metal guardrail welding device according to claim 1, characterized in that: The feeding assembly (8) includes a conveyor belt (81) fixedly connected to the machine body (1) and an electric push rod (82) fixedly connected to the machine body (1) and located above the conveyor belt (81). The conveyor belt (81) is perpendicular to the moving direction of the horizontal pipe (92), and one end of the conveyor belt (81) is inside the machine body (1) and the other end extends outside the machine body (1).

7. A metal guardrail welding device according to claim 6, characterized in that: A baffle (316) is fixedly connected to one end of the bottom surface of the clamping block (31) close to the stop block (32), and the height of the baffle (316) is not lower than the moving height of the clamping block (31).

8. A metal guardrail welding device according to claim 1, characterized in that: One end of the machine body (1) facing the moving direction of the horizontal pipe (92) of the cooling pipe (6) is fixedly connected with a guiding frame (14). The guiding frame (14) is inserted and adapted to the horizontal pipe (92), and one end of the guiding frame (14) far from the cooling pipe (6) is in a flared shape.

Images