Stroller frame welding device and assembling process thereof

Abstract

The invention relates to the technical field of welding, in particular to a stroller frame welding device and an assembly process thereof, and relates to the technical field of welding, the stroller frame welding device comprises a workbench, a positioning mechanism, a clamping mechanism, an air exhaust assembly and a welding mechanism, the positioning mechanism can perform preliminary positioning on a main pipe and a branch pipe, so that two contact surfaces are in an opposite state, and the welding mechanism can perform welding on the main pipe and the branch pipe; the clamping mechanism can drive the main pipe and the branch pipe to move until the two contact faces of the main pipe and the branch pipe are in an abutting state, at the moment, the main pipe and the branch pipe are in a communicating state, an opening in one end of the branch pipe completely wraps a notch in the circumferential wall of the main pipe, and the air exhaust assembly can abut against one end of the main pipe in a sealed mode. And the gas in the main pipe can be pumped out, and the welding mechanism is used for welding a welding seam between the main pipe and the branch pipe. The pipe fitting welding device has the effect that two pipe fittings needing to be welded can be relatively stably attached while the pipe fittings are not subjected to excessive clamping force.

Description

Technical Field

[0001] This application relates to the technical field of welding, and in particular to a welding device for a children's stroller frame and its assembly process. Background Technology

[0002] In the manufacturing process of strollers, furniture, bicycle frames, and various load-bearing truss structures, it is often necessary to weld round tubes together at specific angles (such as Y-type or T-type). The welding quality of these joints directly determines the structural safety, durability, and aesthetics of the entire product.

[0003] Typically, when performing Y-shaped welding between round pipes, mechanical clamps must apply sufficiently large clamping forces to ensure a stable fit between the branch pipe and the main pipe. However, the thin-walled tubing commonly used in children's stroller frames is extremely sensitive to localized stress. Excessive, concentrated clamping force can cause indentations or even plastic deformation on the pipe surface; conversely, insufficient clamping force cannot effectively eliminate the assembly gap between the branch pipe and the main pipe, leading to a decline in weld quality. Therefore, achieving a uniform, non-destructive, and stress-free clamping while ensuring secure positioning is a challenge that current technologies cannot solve. Summary of the Invention

[0004] The purpose of this application is to provide a welding device and assembly process for a children's stroller frame, which enables the two tubes to be welded to fit together relatively stably without being subjected to excessive clamping force.

[0005] Firstly, the stroller frame welding device provided in this application adopts the following technical solution: Workbench; A positioning mechanism is installed on the workbench. The positioning mechanism can perform preliminary positioning of the main pipe and the branch pipe so that the two contact surfaces are facing each other. A clamping mechanism is installed on the workbench. The clamping mechanism can drive the main pipe and the branch pipe to move until the two contact surfaces of the main pipe and the branch pipe are in contact. At this time, the main pipe and the branch pipe are in a connected state, and the opening at one end of the branch pipe completely covers the groove on the peripheral wall of the main pipe. An air extraction assembly is slidably mounted on the clamping mechanism along the axis of the main pipe. The air extraction assembly can seal against one end of the main pipe and can extract the gas inside the main pipe. A welding mechanism, mounted on a workbench, is used to weld the seam between the main pipe and the branch pipe.

[0006] Optionally, the air extraction assembly includes an air pump and a sealing plate. The air pump is slidably mounted on a clamping mechanism. The clamping mechanism is provided with a first driving component that drives the air pump to slide along the main pipe axis. The sealing plate is fixedly mounted on the end of the air pump near the main pipe. The sealing plate is coaxially arranged with the main shaft and can completely cover the opening at one end of the main pipe. The air pump inlet end passes through the sealing plate.

[0007] Optionally, the clamping mechanism is further provided with a detection component for detecting the connection between the main pipe and the branch pipe. The detection component includes a bracket and a pressure sensor. The bracket is slidably mounted on the clamping mechanism and is coaxially located at the end of the branch pipe away from the main pipe. The pressure sensor is installed at the end of the bracket close to the branch pipe. The bracket drives the pressure sensor to slide into the branch pipe until the pressure sensor is located at the connection between the main pipe and the branch pipe. The clamping mechanism is provided with a second driving component that drives the bracket to slide.

[0008] Optionally, the positioning mechanism includes a telescopic frame, a positioning frame, a positioning plate, a first positioning block, and a second positioning block. The telescopic frame is fixedly installed on the workbench, the positioning frame is fixedly installed at the uppermost end of the telescopic frame, and the positioning plate is fixedly installed at the lower end of the positioning frame. The positioning plate is located between the main pipe and the branch pipe. The first positioning block is detachably connected to the end of the positioning plate near the main pipe, and the second positioning block is detachably connected to the end of the positioning plate near the branch pipe. The first positioning block and the second positioning block are arranged opposite to each other, and the shape of the groove on the main pipe is adapted to the shape of the opening at one end of the branch pipe.

[0009] Optionally, both sides of the positioning plate are provided with sliding slots, and the end of the first positioning block near the positioning plate is provided with a sliding plate, which is slidably inserted into the sliding slot. Similarly, the end of the second positioning block near the positioning plate is provided with a sliding plate.

[0010] Optionally, both the first positioning block and the second positioning block are made of plastic.

[0011] Optionally, the clamping mechanism includes two parallelly arranged lead screw and nut assemblies, two slide blocks, two slide tables, and two grippers. The two lead screw and nut assemblies correspond one-to-one with the two slide blocks, the two slide blocks correspond one-to-one with the two slide tables, and the two grippers correspond one-to-one with the two slide tables. The slide blocks are fixedly installed on the nuts in the lead screw and nut assemblies, and the slide tables are slidably installed on the slide blocks. The sliding direction of the slide tables is perpendicular to the moving direction of the slide blocks. The slide blocks are also provided with a third drive assembly for driving the slide tables to move. The grippers are fixedly installed on the slide tables. A rotary motor and a turntable are arranged between one of the grippers and the slide table. The rotary motor is fixedly installed on the slide table, and the turntable is coaxially fixedly connected to the output shaft of the rotary motor. The gripper is fixedly installed on the turntable. The air pump and the slide block are mounted on the slide table corresponding to the main pipe. The first drive assembly is mounted on the slide table corresponding to the main pipe. The bracket and the second drive assembly are both mounted on the upper end face of the turntable.

[0012] Optionally, the workbench includes a base and a rotating platform. The rotating platform is rotatably mounted on the base. A fourth drive assembly for driving the rotating platform to rotate is provided inside the base. A partition plate is vertically arranged on the workbench, dividing the space above the rotating platform into two spaces of the same size. Each space on the rotating platform is independently equipped with a positioning mechanism, a clamping mechanism, an air extraction assembly, and a welding mechanism.

[0013] Secondly, the assembly process of a children's stroller frame provided in this application, based on the aforementioned children's stroller frame welding device, includes the following steps: S1: The worker connects the main pipe to the first positioning block and the branch pipe to the second positioning block; S2: The control center controls the gripper without a turntable to clamp and position the main pipe, controls the turntable to rotate, causing the gripper on the turntable to rotate until the circumference of the gripper holding space is parallel to the branch pipe axis. Then, the control center controls the gripper on the turntable to clamp and position the branch pipe. Then, the control center controls the air pump to move towards the main pipe until the sealing plate on the air pump abuts against one end of the main pipe and the sealing plate completely covers the opening at one end of the main pipe. The air pump is started, and the gas inside the main pipe and the branch pipe is continuously extracted. The control center then controls the telescopic frame to extend, and then controls the two slides to move towards each other until one end of the branch pipe abuts against the circumference of the main pipe. At this time, one end of the branch pipe covers the groove on the circumference of the main pipe. At the same time, the air pressure at the connection between the main pipe and the branch pipe is less than the air pressure at the end of the branch pipe away from the main pipe. Therefore, the branch pipe will be subjected to an air pressure towards the main pipe, so that the branch pipe can be relatively pressed against the main pipe. S3: The control center control bracket slides into the branch pipe until the pressure sensor reaches the position where the branch pipe connects to the main pipe; S4: The control center controls the rotating table to rotate 180 degrees, and then the control center controls the welding mechanism to weld the main pipe and branch pipe welds. Since the gas in the main pipe and branch pipe is in a relatively high-speed flow state, the heat at the contact point of the main pipe and branch pipe is carried away, achieving cooling; at the same time, the staff performs pipe installation operations on the workbench facing them. S5: After welding is completed, the control center controls the rotating table to rotate, and the workers remove the welded pipe fittings and install the new pipe fittings; at the same time, the control center controls the welding mechanism on the side away from the workers to perform welding. S6: Repeat the above operation.

[0014] In summary, this application includes at least one of the following beneficial technical effects: 1. This application utilizes a positioning mechanism to initially position the main pipe and branch pipe, ensuring that the opening at one end of the branch pipe aligns with the groove on the main pipe's peripheral wall. A clamping mechanism then clamps and positions the main pipe and branch pipe, preventing any change in their relative positions in space. The clamping mechanism then moves the main pipe and branch pipe until their two contact surfaces are in contact. This significantly simplifies the process of repeatedly adjusting the main pipe and branch pipe's spatial position to align the branch pipe end with the main pipe's groove, greatly improving welding efficiency. However, due to pipe fitting processing errors and positioning deviations, the connection between the main pipe and branch pipe is not always tight when they are in contact. Therefore, during welding, a large gap between the main pipe and branch pipe may lead to welding failure. The extraction component, however, can remove air from the main pipe. When the gas is extracted, the air pressure inside the main pipe drops rapidly, and the air pressure inside the branch pipe connected to the main pipe also drops. Since the extraction component directly extracts the gas from the main pipe, the air pressure inside the main pipe is relatively the lowest, the air pressure at the connection between the main pipe and the branch pipe is the next lowest, and the air pressure at the end of the branch pipe furthest from the main pipe is the highest and also close to atmospheric pressure. Therefore, the branch pipe will be subjected to atmospheric pressure along the direction closer to the main pipe, making the branch pipe fit more tightly against the outer wall of the main pipe. This force is evenly applied to the branch pipe by atmospheric pressure, so the external force on the branch pipe is not as concentrated as that of the clamps in the existing technology, which would cause the branch pipe to deform. At the same time, the setting of the extraction component ensures that the gas in the main pipe and the branch pipe is always in a state of flow, so the gas at the connection between the main pipe and the branch pipe is also in a state of flow, thereby quickly carrying away the heat during the welding of the main pipe and the branch pipe, achieving the effect of cooling the weld.

[0015] 2. When the main pipe and branch pipe are not fully welded, there will still be some gaps between them. These gaps will cause the air pressure in the main pipe and branch pipe to be higher than the air pressure when there are no gaps. The air pressure sensor in this application can detect the air pressure at the connection between the main pipe and branch pipe in real time. Therefore, when the value measured by the air pressure sensor can be reduced to the preset value after welding is completed, it means that there are no gaps between the main pipe and branch pipe, that is, the welding quality meets the standard; otherwise, it means that the welding quality does not meet the standard. 3. The detachable connection between the first positioning block and the second positioning block allows this application to adapt to more different types of pipes, making the device more practical; 4. Two workstations are set up on the workbench, so that when one workstation is in the welding process, the other workstation is in the unloading and loading state. This avoids the situation of stopping the machine due to the need for loading, thus greatly improving production efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application; Figure 2 yes Figure 1 A schematic diagram of the hidden positioning mechanism; Figure 3 yes Figure 2 A magnified view of part A in the middle; Figure 4 This is a schematic diagram of the positioning mechanism in Embodiment 1 of this application; Figure 5 yes Figure 4 A magnified view of part B in the middle section; Figure 6 This is a schematic diagram of the clamping mechanism in Embodiment 1 of this application; Figure 7 This is a schematic diagram showing the connection between the turntable and the rotating motor in Embodiment 1 of this application; Figure 8 This is a schematic diagram of the structure of the second positioning block in Embodiment 1 of this application; Figure 9 This is a schematic diagram of the structure of the first positioning block in Embodiment 1 of this application; In the diagram, 1. Workbench; 11. Base; 12. Rotary table; 13. Divider plate; 2. Positioning mechanism; 21. Telescopic frame; 22. Positioning frame; 23. Positioning plate; 231. Sliding slot; 24. First positioning block; 25. Second positioning block; 26. Sliding plate; 3. Clamping mechanism; 31. Screw and nut assembly; 32. Slide seat; 33. Slide table; 34. Gripper; 35. Third drive assembly; 36. Rotary motor; 37. Turntable; 4. Air extraction assembly; 41. Air pump; 42. Sealing plate; 43. First drive assembly; 5. Welding mechanism; 6. Detection assembly; 61. Bracket; 62. Pressure sensor; 63. Second drive component; 7. Main pipe; 8. Branch pipe. Detailed Implementation

[0017] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail below.

[0018] A stroller frame welding device, with reference to Figure 1 It includes a worktable 1, a positioning mechanism 2, a clamping mechanism 3, an air extraction assembly 4, and a welding mechanism 5.

[0019] In this embodiment, the workbench 1 includes a base 11 and a rotating platform 12. The base 11 is fixedly installed on the ground. A groove (not shown in the figure) is provided inside the upper surface of the base 11, and a fourth drive component (not shown in the figure) is provided inside the groove. In this embodiment, the fourth drive component is a motor (not shown in the figure). The rotating platform 12 in this embodiment is frustum-shaped and is coaxially rotatably installed on the upper surface of the base 11. The rotating platform 12 is coaxially fixedly connected to the output shaft of the motor. A partition plate 13 is also vertically provided on the upper surface of the rotating platform 12, which divides the space above the rotating platform 12 into two spaces of the same size. Each of the two spaces on the rotating platform 12 is independently provided with a positioning mechanism 2, a clamping mechanism 3, an air extraction component 4, a welding mechanism 5, and other components. Two welding systems are mounted on the rotary table 12. While one welding system is performing welding work, the operator can unload and load materials on the other welding system. After welding and unloading / loading are completed, the motor is started to rotate the rotary table 12, causing the welding system that has been loaded to rotate to the side away from the operator. At this point, the welding system that has completed welding rotates to the operator's side, allowing the operator to resume unloading and loading. The welding system in welding operation is always on the side away from the operator, and is protected by a partition plate 13, preventing welding shavings from splashing onto the operator and providing some protection. The continuous operation of the dual-station system greatly improves production efficiency. Of course, in other optional embodiments, corresponding robotic arms or other equipment can also be equipped for unloading and loading to reduce the workload of the operator.

[0020] Reference Figure 1 , Figure 2 and Figure 3 In this embodiment, the positioning mechanism 2 is installed on the upper surface of the rotating table 12. The positioning mechanism 2 can perform preliminary positioning of the main pipe 7 and the branch pipe 8 so that the surfaces of the main pipe 7 and the branch pipe 8 that are to be in contact are in a state of facing each other. It should be noted that this equipment is also used for welding Y-shaped pipes and T-shaped pipes and other special-shaped pipes. During the welding process, one end of the branch pipe 8 is usually abutted against a specific position on the outer peripheral wall of the main pipe 7, and there is a specific angle between the main pipe 7 and the branch pipe 8. Therefore, the positioning of the main pipe 7 and the branch pipe 8 must be in a stable three-dimensional state. The positioning mechanism 2 in this application can make the surfaces of the main pipe 7 and the branch pipe 8 that are to be in contact are in a state of facing each other, that is, the spatially opposite end faces of the main pipe 7 and the branch pipe 8 are... The main pipe 7 and branch pipe 8 are fixed (no further rotation adjustment is needed), and the specific angle between branch pipe 8 and main pipe 7 is also determined (no further radial rotation adjustment is needed). Subsequently, the main pipe 7 and branch pipe 8 only need to be clamped and fixed by the clamping mechanism 3, and then the main pipe 7 and branch pipe 8 are moved in a direction closer to each other until they are perfectly aligned. This completes the positioning of the main pipe 7 and branch pipe 8. Compared to the prior art, which involves repeatedly adjusting the relative positions of the main pipe 7 and branch pipe 8 in space manually or with a robotic arm to ensure that one end of the branch pipe 8 is perfectly aligned with the periphery of the main pipe 7, the positioning steps of the positioning mechanism 2 in this embodiment are simpler and the positioning is more accurate (combined with...). Figure 4 and Figure 5 ).

[0021] In this embodiment, the clamping mechanism 3, after the positioning mechanism 2 has initially positioned the main pipe 7 and the branch pipe 8, can drive the main pipe 7 and the branch pipe 8 closer together until one end of the branch pipe 8 is perfectly fitted against the outer peripheral wall of a specific position on the main pipe 7, thus finally completing the positioning of the main pipe 7 and the branch pipe 8. In addition, it should be noted that the main pipe 7 in this embodiment has a slot. When the main pipe 7 and the branch pipe 8 abut against each other, the main pipe 7 and the branch pipe 8 are in a state of mutual communication. Furthermore, in this embodiment, the area of ​​the opening at one end of the straight pipe is larger than the area of ​​the slot on the main pipe 7, and the opening at one end of the branch pipe 8 completely covers the slot on the main pipe 7. This design is to facilitate the subsequent addition of internal parts such as ropes or wires inside the Y-shaped pipe.

[0022] In this embodiment, the air extraction component 4 is slidably mounted on the clamping mechanism 3 along the axis of the main pipe 7, and the air extraction component 4 can seal against one end of the main pipe 7. When the air extraction component 4 is activated, it can extract the gas from the main pipe 7.

[0023] In this embodiment, the welding mechanism 5 is mounted on the rotating table 12, and the welding mechanism 5 is a combination of a robotic arm and a welding torch (existing technology, which will not be described in detail here). The robotic arm in this embodiment is a six-axis robotic arm, and the welding torch is mounted at the end of the robotic arm. Therefore, the welding mechanism 5 in this embodiment can weld the weld seam of a three-dimensional spatial structure.

[0024] When welding is required, the positioning mechanism 2 first positions the main pipe 7 and branch pipe 8 in space, ensuring that the contact surfaces on the main pipe 7 and branch pipe 8 are aligned. Then, the clamping mechanism 3 clamps and positions the main pipe 7 and branch pipe 8. Next, the suction assembly 4 slides towards the main pipe 7 until it seals against one end of the main pipe 7. The suction assembly 4 is then activated, extracting the gas from the main pipe 7, causing a drop in pressure. Finally, the clamping mechanism 3 moves the main pipe 7 and branch pipe 8 together. Moving in a direction closer to each other until the contact surfaces of the main pipe 7 and the branch pipe 8 are perfectly aligned, the air pressure in the branch pipe 8 connected to the main pipe 7 will also decrease. Within the entire internal channel of the main pipe 7 and branch pipe 8, the suction assembly 4 directly extracts gas from the main pipe 7, increasing the gas flow rate and decreasing the air pressure. Since the air pressure in the branch pipe 8 is greater than that in the main pipe 7, the gas in the branch pipe 8 is drawn into the main pipe 7 due to the pressure difference. This reduces the amount of gas in the branch pipe 8, and similarly, decreases the pressure within the branch pipe 8. Because the branch pipe 8... The end of the branch pipe 8 furthest from the main pipe 7 is open to the atmosphere, and gas is continuously replenished from this end. Therefore, the gas flow within the branch pipe 8 is also accelerating. Furthermore, the amount of gas near the main pipe 7 in the branch pipe 8 is constantly decreasing, while the amount of gas further away from the main pipe 7 is continuously replenished. Consequently, the pressure within the branch pipe 8 decreases as it approaches the main pipe 7 and increases as it moves further away from the main pipe 7. This pressure difference not only causes the gas to flow within the branch pipe 8 but also exerts pressure on the branch pipe 8 along the direction closer to the main pipe 7, enabling the branch pipe 8 to flow more efficiently. The clamp fits tightly to the outer wall of the main pipe 7, thus reducing the possibility of excessive gaps between the main pipe 7 and the branch pipe 8 due to assembly tolerances and other factors. This avoids substandard welding quality caused by excessive weld seams. In addition, the pressure is atmospheric pressure, which can be evenly applied to the branch pipe 8. Therefore, the external force on the branch pipe 8 is not as concentrated as that applied by the clamp 34 in the prior art, which could cause deformation of the branch pipe 8. This greatly improves the overall production quality of the product. After the main pipe 7 and branch pipe 8 are more tightly fitted together, the welding mechanism 5 is activated to weld the main pipe 7 and branch pipe 8. Since the gas inside the main pipe 7 and branch pipe 8 is always in a state of flow, the gas at the connection between the main pipe 7 and branch pipe 8 is also in a state of flow, thereby quickly carrying away the heat during the welding of the main pipe 7 and branch pipe 8, achieving a cooling effect on the weld. That is, by using the air extraction method in this application, not only can the main pipe 7 and branch pipe 8 be fitted more tightly, avoiding the occurrence of incomplete welding, but the air extraction method can also achieve rapid cooling of the weld, greatly accelerating the weld formation speed, further improving the weld formation quality and increasing the production efficiency of the product.

[0025] Reference Figure 5 and Figure 6In this embodiment, the air extraction assembly 4 includes an air pump 41 and a sealing plate 42.

[0026] The clamping mechanism 3 is equipped with a slide rail, which is arranged parallel to the axis of the main pipe 7. The bottom of the air pump 41 is slidably mounted on the slide rail. A sealing plate 42 is fixedly connected to one end of the air pump 41 near the main pipe 7. The air pump 41 has an air inlet and an air outlet. The air inlet of the air pump 41 passes through the sealing plate 42, and the air pump 41 and the sealing plate 42 are sealed and fixedly connected. The clamping mechanism 3 is also equipped with a first driving component 43 for driving the air pump 41 to slide. In this embodiment, the first driving component 43 is set as an electric push rod. When it is necessary to evacuate the main pipe 7, the electric push rod is activated to extend, and the air pump 41 and the sealing plate 42 move in the direction near the end of the main pipe 7 until the sealing plate 42 abuts against one end of the main pipe 7. Then the air pump 41 is activated to evacuate, thereby realizing the evacuation of the internal space of the main pipe 7.

[0027] It should be noted that the sealing plate 42 in this embodiment is made of rubber material. The rubber sealing plate 42 has a certain elasticity, which can better fit one end of the main pipe 7, so that there is no gap between the air pump 41 and the main pipe 7. This makes it convenient for the air pump 41 to perform air extraction and pressure reduction work on the internal space of the main pipe 7. At the same time, the size of the sealing plate 42 in this embodiment is larger than the cross-sectional area of ​​ordinary pipes, so that the sealing plate 42 can seal one end of the main pipe 7 regardless of the size of the pipe fittings being processed.

[0028] In this embodiment, the clamping mechanism 3 is also provided with a detection component 6 for detecting the connection between the main pipe 7 and the branch pipe 8. The detection component 6 in this embodiment includes a bracket 61 and a pressure sensor 62.

[0029] In this embodiment, the bracket 61 is L-shaped. The upper part of the bracket 61 is coaxially arranged with the branch pipe 8, and the lower part of the bracket 61 is slidably connected to the clamping mechanism 3. Similarly, the clamping assembly is also provided with a slide rail, the arrangement direction of which is parallel to the axis of the branch pipe 8. The clamping mechanism 3 is also provided with a second driving assembly for driving the bracket 61 to move along the slide rail. In this embodiment, the second driving assembly is also an electric push rod. The bracket 61 is fixedly connected to the output shaft of the electric push rod, and the pressure sensor 62 is fixedly installed at the end of the upper bracket 61 away from the second driving assembly.

[0030] When the clamping mechanism 3 clamps and positions the branch pipe 8 and makes the main pipe 7 and the straight pipe come into contact, the second drive assembly is activated. The second drive assembly drives the bracket 61 to move along the direction close to the end of the branch pipe 8. Then the upper bracket 61 slides coaxially into the interior of the branch pipe 8 from the end of the branch pipe 8 away from the main pipe 7 until the pressure sensor 62 on the bracket 61 reaches the connection between the branch pipe 8 and the main pipe 7, at which point the second drive assembly stops extending.

[0031] When the weld between branch pipe 8 and main pipe 7 is not completely welded, due to the relatively non-smooth contact surfaces between the main pipe 7 and branch pipe 8, and possible dimensional deviations and assembly tolerances, there are still some gaps between them. The air pressure at the connection point between the main pipe 7 and branch pipe 8 is relatively lower than atmospheric pressure. Therefore, some external gas will enter the connection point between the main pipe 7 and branch pipe 8 through these gaps. Thus, compared to when the weld between the main pipe 7 and branch pipe 8 is completely closed, the pressure at the connection point with gaps is definitely relatively higher. A preset value can be set in the control center of the device. When the welding mechanism 5 welds the weld between the main pipe 7 and branch pipe 8... After the weld is completed, if the value measured by the pressure sensor 62 reaches the preset value, it means that there is no gap between the main pipe 7 and the branch pipe 8, that is, the weld between the main pipe 7 and the branch pipe 8 is completely closed, and the welding quality between the main pipe 7 and the branch pipe 8 meets the standard. Conversely, if the value measured by the pressure sensor 62 does not reach the preset value, it means that there is still a gap between the main pipe 7 and the branch pipe 8, that is, the weld between the main pipe 7 and the branch pipe 8 is not closed, and the welding quality between the main pipe 7 and the branch pipe 8 does not meet the standard. Then the control center will start the welding mechanism 5 to re-weld the weld between the main pipe 7 and the branch pipe 8, and after the welding is completed, the measurement and analysis will be carried out again.

[0032] It should be noted that the control center in this embodiment is a PLC control system, and the positioning mechanism 2, clamping mechanism 3, air pump 41, first drive component 43, second drive component, pressure sensor 62 and welding mechanism 5 in this embodiment are all electrically connected to the control center. In addition, the control center in this embodiment stores data for welding various types of Y-tubes. With the power of the air pump 41 remaining constant, since the pipe diameters used for different types of Y-tubes are different, the air pressure in the main pipe 7, the air pressure in the branch pipe 8, and the air pressure at the connection between the main pipe 7 and the branch pipe 8 are all different. Therefore, when different types of Y-tubes need to be welded, the preset values ​​set at the connection between the main pipe 7 and the branch pipe 8 are also different. Thus, the operator can preset the data system corresponding to the type of Y-tube to be welded so that the detection component 6 can accurately measure the welding quality between the main pipe 7 and the branch pipe 8.

[0033] Reference Figure 1 and Figure 5 In this embodiment, the positioning mechanism 2 includes a telescopic frame 21, a positioning frame 22, a positioning plate 23, a first positioning block 24, and a second positioning block 25 (in combination). Figure 8 and Figure 9 ).

[0034] In this embodiment, the telescopic frame 21 is an electric telescopic frame 21, which has a built-in electric push rod and other driving components at its bottom. The telescopic frame 21 is fixed vertically on the rotating table 12 and is located on one side of the clamping mechanism 3. The positioning frame 22 is fixedly connected to the uppermost end of the telescopic frame 21. The positioning frame 22 is arranged horizontally and is located directly above the clamping mechanism 3. The positioning plate 23 is fixedly installed on the lower end face of the positioning frame 22 and is arranged vertically. The first positioning block 24 and the second positioning block 25 are detachably connected to the positioning plate 23. The first positioning block 24 and the second positioning block 25 are arranged opposite to each other on both sides of the positioning plate 23 along the thickness direction of the positioning plate 23. The first positioning block 24 is adapted to the shape of the slot on the main pipe 7, and the second positioning block 25 is adapted to the shape of the opening at one end of the branch pipe 8.

[0035] When initial positioning of the main pipe 7 and branch pipe 8 is required, the positioning plate 23 is first lowered into the clamping mechanism 3 via the telescopic frame 21. Then, the operator or robotic arm moves the end of the main pipe 7 with the slot along the direction close to the first positioning block 24 until the first positioning block 24 slides into the slot of the main pipe 7. Normally, the slot is not circular, therefore the corresponding shape of the first positioning block 24 is also not cylindrical. When the first positioning block 24 slides into the slot, the main pipe 7 cannot move in the up, down, left, or right directions in space, nor can it rotate; it can only move towards or away from the first positioning block 24. Similarly, in order to fit against the curved outer wall of the main pipe 7, one end of the branch pipe 8 cannot be a flat circular end face. Normally, the end of a straight pipe is set as a three-dimensional curved surface. The second positioning block 25, to adapt to the end of the branch pipe 8, also has a corresponding three-dimensional curved surface. The three-dimensional curved surfaces have a mutual clamping effect on the cross-section of the branch pipe 8, meaning the branch pipe 8 cannot rotate around its own axis. Therefore, the second positioning block 25... Block 25 also effectively restricts the branch pipe 8 from moving up, down, left, right, and rotating. Since the first positioning block 24 and the second positioning block 25 are arranged opposite each other, after the main pipe 7 and the branch pipe 8 are initially positioned, the end faces that were originally to contact the main pipe 7 and the branch pipe 8 are now facing each other. Then, the clamping mechanism 3 clamps and positions both the main pipe 7 and the branch pipe 8. The clamping mechanism 3 also moves the main pipe 7 along its own axis away from the branch pipe 8 and moves the branch pipe 8 along its own axis away from the main pipe 7. Then, the main pipe 7 disengages from the first positioning block 25. Positioning block 24 and branch pipe 8 are disengaged from second positioning block 25. Then, telescopic frame 21 is activated. Telescopic frame 21 drives positioning plate 23 and positioning block to move upward so as to disengage from inside clamping mechanism 3. Then, clamping mechanism 3 drives main pipe 7 and branch pipe 8 back to their original positions. At this time, main pipe 7 and branch pipe 8 are disengaged from positioning mechanism 2, and the end faces that were originally to contact are still facing each other. Therefore, as long as main pipe 7 and branch pipe 8 are moved towards each other until main pipe 7 and branch pipe 8 abut against each other, the entire positioning work of main pipe 7 and branch pipe 8 is completed.

[0036] In the process of positioning the main pipe 7 and the branch pipe 8, the first positioning block 24 and the second positioning block 25 enable the main pipe 7 and the branch pipe 8 to be accurately positioned in one operation. Compared with the traditional method of adjusting the main pipe 7 or the branch pipe 8 in space multiple times so that the end faces of the main pipe 7 and the branch pipe 8 that were originally to be in contact are aligned, the positioning method in this embodiment is more convenient and simple, consumes less time, and greatly improves the production efficiency of the product.

[0037] In addition, in this embodiment, the first positioning block 24 and the second positioning block 25 are both detachably connected to the positioning plate 23. In this embodiment, the first positioning block 24 and the second positioning block 25 are also provided in multiple models. One of the first positioning blocks 24 and one of the second positioning blocks 25 can be put into a set. Each set of positioning blocks corresponds to a model of Y-tube. Therefore, different models of positioning block sets can be replaced in advance according to the model of the Y-tube to be produced, so that the equipment can adapt to the production of different models of Y-tubes, which greatly improves the practicality of the equipment.

[0038] To facilitate the replacement of the first positioning block 24 and the second positioning block 25, sliding slots 231 are provided on both sides of the positioning plate 23 in this embodiment. A sliding plate 26 is provided at the end of the first positioning block 24 near the positioning plate 23. The sliding plate 26 can be slidably inserted into the sliding slot 231. Similarly, a sliding plate 26 is also provided at the end of the second positioning block 25 near the positioning plate 23. When it is necessary to replace the first positioning block 24 or the second positioning block 25, simply pull the sliding plate 26 out of the sliding slot 231 and then insert another type of first positioning block 24 or second positioning block 25. It should be noted that in all models of this embodiment, the sliding plates 26 on the first positioning block 24 and the second positioning block 25 are the same size and shape, and the two positioning grooves on the positioning plate 23 are also the same size and shape. In addition, the first positioning block 24 and the second positioning block 25 in this embodiment are made of polyoxymethylene plastic. This plastic has a certain strength and hardness and is not easily deformed. Therefore, it can play a good limiting role for the main pipe 7 and the branch pipe 8. At the same time, the friction between this plastic and metal is small, so the wear between it and the main pipe 7 and the branch pipe 8 will be relatively small, reducing the probability that the main pipe 7 and the branch pipe 8 will be scratched by the positioning block.

[0039] Refer to 1. Figure 6 and Figure 7 In this embodiment, the clamping mechanism 3 includes two parallel screw and nut assemblies 31, two slide blocks 32, two slide tables 33, and two grippers 34.

[0040] In this embodiment, the lead screw and nut assembly 31 can move linearly back and forth with the moving parts. The gripper 34 in this embodiment can grip pipes and other items. Both of these components are existing technology and will not be described in detail here. In this embodiment, the two lead screw and nut assemblies 31 correspond one-to-one with the two slide blocks 32, the two slide blocks 32 correspond one-to-one with the two sliding tables 33, and the two grippers 34 correspond one-to-one with the two sliding tables 33. The slide blocks 32 are fixedly installed on the nuts in the lead screw and nut assemblies 31. A slide rail is provided on the upper end face of the slide block 32, and the direction of the slide rail is perpendicular to the direction of movement of the nuts in the lead screw and nut assemblies 31. The sliding tables 33 are slidably installed on the slide rails on the slide blocks 32. A third drive assembly 35 is provided on the slide blocks 32 to drive the sliding tables 33 to slide. In this embodiment, the third drive component 35 is also configured as an electric push rod. The gripper 34 near the partition plate 13 is fixedly installed on the corresponding slide 33, and the axis of the gripping cavity of the gripper 34 is parallel to the moving direction of its corresponding slide 32. The slide rail slidably connected to the air pump 41 is set on the slide 33 near the partition plate 13, and the layout direction of the slide rail connected to the air pump 41 is parallel to the axis of the gripping cavity on the gripper 34. The first drive component 43 is also installed on the slide 33 near the partition plate 13.

[0041] A rotary motor 36 and a turntable 37 are provided between the gripper 34 away from the partition plate 13 and the slide table 33. The rotary motor 36 is fixedly mounted on the slide table 33, and the turntable 37 is coaxially fixedly mounted on the output shaft of the rotary motor 36. The bottom of the gripper 34 is coaxially fixedly mounted on the upper end face of the turntable 37. The slide rail slidably connected to the bracket 61 is fixedly mounted on the turntable 37. The layout direction of the slide rail corresponding to the bracket 61 is parallel to the axis of the gripping cavity of the gripper 34 away from the partition plate 13. The bracket 61 is coaxially arranged with the gripping cavity of the gripper 34, and the bracket 61 is located at the end of the gripper 34 away from the partition plate 13. The second drive assembly is fixedly mounted on the turntable 37.

[0042] In addition, in this embodiment, the positioning plate 23 is located between the two grippers 34. When it is necessary to position the main pipe 7 and the branch pipe 8, the telescopic frame 21 drives the positioning plate 23 to move to a height level with the two grippers 34 (the two grippers 34 are always at the same height). After the positioning mechanism 2 has finished positioning the main pipe 7 and the branch pipe 8, the control center starts the screw nut assembly 31 near the partition plate 13, which drives the slide 32, the slide table 33 and the grippers 34 to move until the grippers 34 near the partition plate 13 are located at the position of the main pipe 7 relative to the center (if the slot is opened at the position of the main pipe 7 near the center, the grippers 34 will clamp the other positions of the main pipe 7). At the same time, the control center will also start The screw and nut assembly 31, located away from the partition plate 13, drives the slide 32, slide table 33, turntable 37, and gripper 34 to move until the gripper 34, located away from the partition plate 13, moves to the center of the branch pipe 8. Then, the rotary motor 36 is started, driving the turntable 37 to rotate. The turntable 37 then drives the gripper 34 to rotate, so that the axis of the gripper 34's clamping cavity is parallel to the axis of the branch pipe 8 on the second positioning block 25. Then, the third drive assembly 35 on both slides 32 is started simultaneously. The third drive assembly 35 closer to the partition plate 13 drives the corresponding gripper 34 to move along the direction close to the main pipe 7 on the first positioning block 24 until the main pipe 7 is close to the partition plate 13. The clamping cavities of the 13 grippers 34 are coaxially arranged. The control center controls the grippers 34 to tighten, thereby clamping and positioning the main pipe 7. At the same time, the third drive assembly 35, which is away from the partition plate 13, drives the corresponding grippers 34 to move along the direction of the branch pipe 8 near the second positioning block 25 until the branch pipe 8 and the clamping cavity of the grippers 34 away from the partition plate 13 are coaxially arranged. The control center controls the grippers 34 to tighten, thereby clamping and positioning the branch pipe 8. After the main pipe 7 and the branch pipe 8 are both clamped stably, the control center activates the third drive assembly 35 corresponding to the main pipe 7, driving the main pipe 7 to disengage from the first positioning block 24 along its own axis, and at the same time activates the branch pipe... The third drive assembly 35 and the lead screw and nut assembly 31 corresponding to pipe 8 drive the branch pipe 8 to disengage from the second positioning block 25 along its own axis. After the main pipe 7 and the branch pipe 8 are completely disengaged, the control center starts the telescopic frame 21 to move the positioning plate 23 upward. Then, the control center starts the third drive assembly 35 corresponding to the main pipe 7, the third drive assembly 35 corresponding to the branch pipe 8, and the lead screw and nut assembly 31 corresponding to the branch pipe 8 again to make the two grippers 34 return to their original positions. Then, the two third drive assemblies 35 are started again to move the main pipe 7 and the branch pipe 8 in a direction that brings them closer to each other until the main pipe 7 and the branch pipe 8 are in contact with each other, thus realizing the complete positioning of the main pipe 7 and the branch pipe 8.

[0043] Finally, it should be noted that all the aforementioned types of drive sources and sensors are electrically connected to the control center. Example 2

[0044] An assembly process for a children's stroller frame, based on the aforementioned children's stroller frame welding device, includes the following steps: S1: The staff connects the main pipe 7 to the first positioning block 24 and the branch pipe 8 to the second positioning block 25; S2: The control center controls the gripper 34 (without the turntable 37) to clamp and position the main pipe 7. The control center controls the turntable 37 to rotate, causing the gripper 34 on the turntable 37 to rotate until the axis of the gripper 34's clamping space is parallel to the axis of the branch pipe 8. Then, the control center controls the gripper 34 on the turntable 37 to clamp and position the branch pipe 8. Then, the control center first uses the clamping mechanism 3 to disengage the main pipe 7 from the first positioning block 24 and the branch pipe 8 from the second positioning block 25. The control center then controls the telescopic frame 21 to extend until the positioning plate 23 moves above the two grippers 34. Then, the control center drives the air pump 41 to move towards the main pipe 7 until the sealing plate 42 on the air pump 41 abuts against the main pipe. At one end of 7, the air pump 41 is started to evacuate the air inside the main pipe 7, and the air pressure inside the main pipe 7 drops. Then, the control center controls the clamping mechanism 3 to drive the main pipe 7 and the branch pipe 8 back to their original positions. Then, the two slides 33 are controlled to move in a direction that approaches each other (that is, the two grippers 34 move in a direction that approaches each other) until one end of the branch pipe 8 abuts against the peripheral wall of the main pipe 7. At this time, one end of the branch pipe 8 covers the groove on the peripheral wall of the main pipe 7. Since the gas inside the main pipe 7 and the branch pipe 8 is continuously extracted, and the air pressure at the connection between the main pipe 7 and the branch pipe 8 is less than the air pressure at the end of the branch pipe 8 away from the main pipe 7, the branch pipe 8 will be subjected to an air pressure in the direction that approaches the main pipe 7, so that the branch pipe 8 can be relatively more tightly pressed against the main pipe 7. S3: The control center control bracket 61 is slidably inserted into the branch pipe 8 until the pressure sensor 62 reaches the position where the branch pipe 8 is connected to the main pipe 7. S4: The control center controls the rotating table 12 to rotate 180 degrees, and then the control center controls the welding mechanism 5 to weld the weld seam of the main pipe 7 and the branch pipe 8. Since the gas in the main pipe 7 and the branch pipe 8 is in a relatively high-speed flow state, the heat at the contact point of the main pipe 7 and the branch pipe 8 is carried away, achieving cooling. At the same time, the staff performs pipe installation operation on the workbench 1 facing them. S5: After welding is completed, the control center controls the rotating table 12 to rotate, and the staff removes the welded pipe fitting and installs the new pipe fitting; at the same time, the control center controls the welding mechanism 5 on the side away from the staff to perform welding. S6: Repeat the above operation.

[0045] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A welding device for a children's stroller frame, characterized in that, include: Workbench (1); Positioning mechanism (2) is installed on workbench (1). The positioning mechanism (2) can perform preliminary positioning of main pipe (7) and branch pipe (8) so that the two contact surfaces are facing each other. The clamping mechanism (3) is installed on the workbench (1). The clamping mechanism (3) can drive the main pipe (7) and the branch pipe (8) to move until the two contact surfaces of the main pipe (7) and the branch pipe (8) are in contact. At this time, the main pipe (7) and the branch pipe (8) are in communication, and the opening at one end of the branch pipe (8) completely covers the groove on the periphery of the main pipe (7). The air extraction assembly (4) is slidably mounted on the clamping mechanism (3) along the axis of the main pipe (7). The air extraction assembly (4) can seal against one end of the main pipe (7) and can extract the gas inside the main pipe (7). Welding mechanism (5) is installed on workbench (1) and is used to weld the weld between main pipe (7) and branch pipe (8).

2. The stroller frame welding device according to claim 1, characterized in that, The air extraction assembly (4) includes an air pump (41) and a sealing plate (42). The air pump (41) is slidably mounted on the clamping mechanism (3). The clamping mechanism (3) is provided with a first drive assembly (43) that drives the air pump (41) to slide along the axis of the main pipe (7). The sealing plate (42) is fixedly mounted on one end of the air pump (41) near the main pipe (7). The sealing plate (42) is coaxially arranged with the main shaft and can completely cover the opening at one end of the main pipe (7). The air inlet end of the air pump (41) passes through the sealing plate (42).

3. The stroller frame welding device according to claim 2, characterized in that, The clamping mechanism (3) is also provided with a detection component (6) for detecting the connection between the main pipe (7) and the branch pipe (8). The detection component (6) includes a bracket (61) and a pressure sensor (62). The bracket (61) is slidably mounted on the clamping mechanism (3), and the bracket (61) is coaxially located at the end of the branch pipe (8) away from the main pipe (7). The pressure sensor is installed at the end of the bracket (61) close to the branch pipe (8). The bracket (61) drives the pressure sensor (62) to slide into the branch pipe (8) until the pressure sensor (62) is located at the connection between the main pipe (7) and the branch pipe (8). The clamping mechanism (3) is provided with a second driving component that drives the bracket (61) to slide.

4. The stroller frame welding device according to claim 1, characterized in that, The positioning mechanism (2) includes a telescopic frame (21), a positioning frame (22), a positioning plate (23), a first positioning block (24), and a second positioning block (25). The telescopic frame (21) is fixedly installed on the workbench (1). The positioning frame (22) is fixedly installed at the uppermost end of the telescopic frame (21). The positioning plate (23) is fixedly installed at the lower end of the positioning frame (22). The positioning plate (23) is located between the main pipe (7) and the branch pipe (8). The first positioning block (24) is detachably connected to the end of the positioning plate (23) near the main pipe (7). The second positioning block (25) is detachably connected to the end of the positioning plate (23) near the branch pipe (8). The first positioning block (24) and the second positioning block (25) are arranged opposite to each other. The shape of the groove on the main pipe (7) is adapted to the shape of the opening at one end of the branch pipe (8).

5. The stroller frame welding device according to claim 4, characterized in that, Both sides of the positioning plate (23) are provided with sliding slots (231). The first positioning block (24) is provided with a sliding plate (26) at one end near the positioning plate (23). The sliding plate (26) slides into the sliding slot (231). Similarly, the second positioning block (25) is provided with a sliding plate (26) at one end near the positioning plate (23).

6. The stroller frame welding device according to claim 5, characterized in that, Both the first positioning block (24) and the second positioning block (25) are made of plastic.

7. The stroller frame welding device according to claim 3, characterized in that, The clamping mechanism (3) includes two parallel screw and nut assemblies (31), two slide blocks (32), two slide tables (33), and two grippers (34). The two screw and nut assemblies (31) correspond one-to-one with the two slide blocks (32), the two slide blocks (32) correspond one-to-one with the two slide tables (33), and the two grippers (34) correspond one-to-one with the two slide tables (33). The slide blocks (32) are fixedly installed on the nuts in the screw and nut assemblies (31), and the slide tables (33) are slidably installed on the slide blocks (32). The sliding direction of the slide tables (33) is perpendicular to the moving direction of the slide blocks (32). The slide blocks (32) are also provided with a third drive mechanism to drive the slide tables (33) to move. The component (35) has a gripper (34) fixedly mounted on a slide (33). A rotating motor (36) and a turntable (37) are provided between one of the grippers (34) and the slide (33). The rotating motor (36) is fixedly mounted on the slide (33), and the turntable (37) is coaxially fixedly connected to the output shaft of the rotating motor (36). The gripper (34) is fixedly mounted on the turntable (37). The air pump (41) and the sliding assembly are mounted on the slide (33) corresponding to the main pipe (7). The first drive assembly (43) is mounted on the slide (33) corresponding to the main pipe (7). The bracket (61) and the second drive assembly are both mounted on the upper surface of the turntable (37).

8. The stroller frame welding device according to claim 1, characterized in that, The workbench (1) includes a base (11) and a rotating platform (12). The rotating platform (12) is rotatably mounted on the base (11). A fourth drive assembly for driving the rotating platform (12) to rotate is provided inside the base (11). A partition plate (13) is vertically arranged on the workbench (1). The partition plate (13) divides the space above the rotating platform (12) into two spaces of the same size. Each space on the rotating platform (12) is independently provided with a positioning mechanism (2), a clamping mechanism (3), an air extraction assembly (4), and a welding mechanism (5).

9. An assembly process for a children's stroller frame, based on the children's stroller frame welding device according to any one of claims 1-8, comprising the following steps: S1: The staff connects the main pipe (7) to the first positioning block (24) and the branch pipe (8) to the second positioning block (25); S2: The control center controls the gripper (34) without the turntable (37) to clamp and position the main pipe (7), controls the turntable (37) to rotate, causing the gripper (34) on the turntable (37) to rotate to a position where the circumference of the gripper (34) clamping space is parallel to the axis of the branch pipe (8), then controls the gripper (34) on the turntable (37) to clamp and position the branch pipe (8), and then controls the air pump (41) to move in the direction close to the main pipe (7) until the sealing plate (42) on the air pump (41) abuts against one end of the main pipe (7), and the sealing plate (42) completely covers the opening at one end of the main pipe (7), and starts. The air pump (41) continuously extracts the gas inside the main pipe (7) and the branch pipe (8). The control center then controls the telescopic frame (21) to extend, and then controls the two slides (33) to move in a direction that approaches each other until one end of the branch pipe (8) abuts against the periphery of the main pipe (7). At this time, one end of the branch pipe (8) covers the slot on the periphery of the main pipe (7). Meanwhile, the air pressure at the connection between the main pipe (7) and the branch pipe (8) is less than the air pressure at the end of the branch pipe (8) away from the main pipe (7). Therefore, the branch pipe (8) will be subjected to an air pressure in the direction of the main pipe (7), so that the branch pipe (8) can press against the main pipe (7) relatively. S3: The control center control bracket (61) slides into the branch pipe (8) until the pressure sensor (62) reaches the position where the branch pipe (8) and the main pipe (7) are connected; S4: The control center controls the rotating table (12) to rotate 180 degrees, and then the control center controls the welding mechanism (5) to weld the weld seam of the main pipe (7) and the branch pipe (8). Since the gas in the main pipe (7) and the branch pipe (8) is in a relatively high-speed flow state, the heat at the contact point of the main pipe (7) and the branch pipe (8) is carried away, achieving cooling. At the same time, the staff performs pipe installation operation on the workbench (1) facing them. S5: After welding is completed, the control center controls the rotating table (12) to rotate, and the staff removes the welded pipe fittings and installs the new pipe fittings; at the same time, the control center controls the welding mechanism (5) on the side away from the staff to perform welding. S6: Repeat the above operation.

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