Civil air defense engineering building air pipe welding device

Abstract

The present application relates to the technical field of civil air defense engineering component processing, in particular to a civil air defense engineering building air pipe welding device, which comprises a T-shaped seat and a double-station tooling, the T-shaped seat is provided with two groups and is arranged at the two ends of the double-station tooling, a bottom support table is welded and fixed between the two groups of T-shaped seats, and a welding machine is arranged on one side of the bottom support table; the double-station tooling comprises two groups of workpiece support sleeve groups and a middle cylinder arranged in the middle between the two groups of workpiece support sleeve groups, each group of workpiece support sleeve group is composed of two groups of coaxially arranged support sleeves, and two groups of support sleeves in the same group of workpiece support sleeve group provide support for two sections of circular building air pipes to be welded and spliced. The double-station tooling is adopted, the welding and feeding and discharging can be synchronized, the processing efficiency is high, the station switching is realized through the overall rotation of the tooling, the workpiece locking and releasing are automatically completed through the linkage self-locking structure, and manual locking operation is not needed, so that the use is convenient.

Description

Technical Field

[0001] This invention relates to the field of civil defense engineering component processing technology, specifically to a welding device for air ducts in civil defense engineering buildings. Background Technology

[0002] In civil defense engineering construction, building ducts are key components of the ventilation system. Circular building ducts are widely used as main ventilation ducts in civil defense projects due to their high structural strength and low airflow resistance. However, due to limitations in the width of the initial sheet metal material and the size of the rolling machine, the initially processed ducts are relatively short, requiring welding to achieve a certain length.

[0003] Currently, most welding equipment for splicing and welding circular ducts only has one workpiece clamping position. Operators must first complete the disassembly of the previous batch of ducts and the installation and positioning of the next batch before welding can begin. During the welding process, the equipment is in a waiting state; during loading and unloading, the welding machine is idle. This sequential operation method results in low equipment utilization and low batch production efficiency.

[0004] To achieve circumferential welding, the duct needs to be driven to rotate at a uniform speed during the welding process. In conventional designs, the radial locking (to prevent movement) and rotation drive of the duct are usually controlled by two independent actuators. The operator needs to lock the duct first and then start the drive mechanism; after welding, the drive must be released and then the locking must be released. This involves multiple steps and discontinuous actions, reducing the welding cycle time. After welding, slag, spatter, and raised weld reinforcement will form on the duct surface. To obtain a smooth surface, the duct usually needs to be transferred to another grinding station or manually ground with hand tools, increasing material handling and additional procedures. Therefore, a welding device for ducts in civil defense engineering buildings is proposed. Summary of the Invention

[0005] To address the problems in the prior art, the present invention provides a welding device for ventilation ducts in civil defense engineering buildings, thereby solving the problems mentioned in the background art.

[0006] The technical solution adopted by the present invention to solve its technical problem is a welding device for air ducts in civil defense engineering buildings, including a T-shaped seat and a double-station fixture. Two sets of T-shaped seats are provided and respectively set at both ends of the double-station fixture. A bottom support platform is welded and fixed between the two sets of T-shaped seats at the bottom. A welding machine is provided on one side of the bottom support platform. The dual-station tooling includes two sets of workpiece support sleeves and a central cylinder located in the middle between the two sets of workpiece support sleeves. Each set of workpiece support sleeves consists of two sets of coaxially arranged support sleeves. The two sets of support sleeves in the same set of workpiece support sleeves provide support for the two sections of circular building duct to be welded and spliced. The support sleeves are welded and fixed to the central cylinder. The two ends of the central cylinder are fixedly provided with shaft heads. The shaft heads are rotatably connected to the T-shaped seats at the corresponding positions through bearing seats.

[0007] Specifically, the top and bottom surfaces of the support sleeve are respectively provided with support wheel grooves and drive wheel grooves. The two sets of workpiece support sleeves are arranged in an inverted manner. In one set of workpiece support sleeves, the support wheel groove is located at the top of the support sleeve and the drive wheel groove is located at the bottom of the support sleeve. In the other set of workpiece support sleeves, the support wheel groove is located at the bottom of the support sleeve and the drive wheel groove is located at the top of the support sleeve. After the dual-station fixture rotates 180 degrees, the positions of the two sets of workpiece support sleeves are swapped. However, the position of the swapped workpiece support sleeves is exactly the same as the position of the upper workpiece support sleeves.

[0008] Specifically, an arc-shaped push plate is provided on the outer periphery of the support sleeve near the support wheel groove. Support wheels are respectively installed on both sides of the arc-shaped push plate near the support wheel groove via wheel frames. An elastic connection structure is provided on the arc-shaped push plate and in the area between the support wheels. The elastic connection structure includes a sleeve, an inner rod is inserted into the top of the sleeve, the inner rod is welded and fixed to the support sleeve at the corresponding position, and a first spring is sleeved on the outer periphery of the inner rod and the sleeve. The two ends of the first spring are respectively welded and fixed to the arc-shaped push plate and the support sleeve at the corresponding positions.

[0009] Specifically, a support frame is welded to the outer periphery of the support sleeve near the drive wheel groove, a drive structure is provided inside the support frame, and a first servo electric cylinder is installed on the top of the support frame; The drive structure includes an inner frame. A drive wheel is rotatably mounted on one end of the inner frame near the drive wheel groove via a bearing. A rubber surface layer is bonded to the outer surface of the drive wheel. A servo drive motor is bolted to the other end of the inner frame. The drive end of the servo drive motor and the shaft head at one end of the drive wheel both extend to the outside of the inner frame and are respectively fixedly mounted with first sprockets. The first sprockets are connected to each other via a first chain drive. The output end of a first servo electric cylinder is fixedly mounted to the end of the inner frame away from the drive wheel. By pushing the inner frame down with the first servo electric cylinder, the drive wheel can pass through the drive wheel groove and enter the support sleeve. After the servo drive motor is turned on, it can drive the drive wheel to run.

[0010] Specifically, the bottom support platform has a self-locking structure on the side near the welding machine. There are at least two sets of self-locking structures, which are in contact with the bottom of the arc-shaped push plate on the side near the welding machine.

[0011] Specifically, the self-locking structure includes a rectangular frame located at the bottom of the bottom support platform and fixed to the platform with bolts. Piston sleeves are fixedly installed at both ends of the rectangular frame, and a piston is inserted into the top of each sleeve. The top of the piston passes through the rectangular frame and the bottom support platform, and a U-shaped wheel frame is bolted to it. Rollers for pushing the arc-shaped pressure plate are installed at both ends of the top of the U-shaped wheel frame. A second spring is fitted around the bottom of the U-shaped wheel frame and around the piston. After the dual-station fixture rotates 180 degrees, one set of workpiece support sleeves is positioned at the top of the self-locking structure. The arc-shaped pressure plate in this workpiece support sleeve contacts the rollers in the self-locking structure, causing the support wheel on the arc-shaped pressure plate to rise through the support wheel groove and support the bottom of the circular building duct in the support sleeve, thus aligning it with the... The drive wheels contact the bottom of the drive wheels, and the two sets of coaxial support sleeves limit the top position of the circular building duct at the same height, so that the coaxially set duct is coaxially rolled and locked. After the drive wheels run, the support sleeves rotate to cooperate with the welding machine to weld the splice of the two sections of duct to be welded in a circumferential welding manner. The workpiece can be driven to rotate 180 degrees again in front of the dual-station fixture. After that, the workpiece support sleeve will leave the welding work area of ​​the welding machine and leave the self-locking structure. This makes the duct that has been welded in the workpiece support sleeve lose its rolling lock. The personnel can easily pull out the duct for unloading and re-insert the next batch of duct to be spliced ​​and welded. Based on the exchange of the processing positions of the two sets of workpiece support sleeves between the T-shaped seats, the self-locking of the workpiece can be achieved in linkage, which is convenient to use.

[0012] Specifically, an annular sleeve is fitted around the middle of the outer periphery of the dual-station fixture, and the annular sleeve is located between two sets of coaxial support sleeves. A support platform is welded to the bottom of the annular sleeve. Air nozzles are installed at equal distances on both sides of the top of the support platform and on both sides of the inner wall of the annular sleeve. Annular air distribution pipes are installed on both sides of the outer periphery of the annular sleeve by clamps, and the exhaust end of the annular air distribution pipe is connected to the air inlet end of the air nozzle. A welding operation port for the welding machine to extend into is opened on one side of the annular sleeve.

[0013] Specifically, a weld grinding section is provided on the side of the top of the support platform near the welding machine. The weld grinding section includes a U-shaped support frame. A grinding wheel is provided at the top inside the U-shaped support frame. The two ends of the grinding wheel are rotatably connected to the U-shaped support frame. A drive motor is provided at the bottom inside the U-shaped support frame. The drive end of the drive motor and the end of the grinding wheel both pass through the U-shaped support frame and are equipped with second sprockets. The second sprockets are connected to each other by a second chain. In actual use, protective covers can be provided on the outside of the sprockets and the chain. The outer periphery of the protective cover is fixed by bolts to the adjacent support frame. A second servo electric cylinder is installed on one side of the bottom of the support platform. The output end of the second servo electric cylinder passes through the support platform and is fixed to the bottom of the U-shaped support frame. Guide columns are installed at both ends of the bottom of the U-shaped support frame and pass through the bottom of the support platform. The second servo electric cylinder pushes the U-shaped support frame, so that the grinding wheel in the U-shaped support frame moves closer to the weld of the welded air duct. The grinding wheel is driven by the drive motor to rotate, and the welding protrusion formed after the air duct is welded is ground to improve the flatness of the air duct surface after welding.

[0014] Specifically, a one-way air intake valve is installed at the bottom end and one side bottom of the piston sleeve. An air filter valve is installed at the air intake end of the one-way air intake valve located at the bottom side of the piston sleeve. The exhaust end of the one-way air intake valve located at the bottom end of the piston sleeve is connected to the air intake end of the annular air distribution pipe through a pipe. After each 180-degree rotation of the dual-station tooling, a pushing force is generated on the self-locking structure, causing the piston to move inside the piston sleeve. Based on the setting of the one-way valve, air is filled into the piston sleeve each time the piston moves, and the air is discharged into the annular air distribution pipe due to the piston movement and discharged through the air nozzle. The air nozzle blows away the welding slag and debris from the surface of the air duct, improving the product quality of the air duct. During actual assembly, the air nozzle is aligned with the weld seam of the air duct, and the blowing air pressure of the air nozzle can be adjusted by increasing the number of self-locking structures or the diameter of the piston sleeve and the piston.

[0015] Specifically, a servo geared motor is installed on the outer side of one of the T-shaped seats, and the drive end of the servo geared motor is connected to the shaft head at the corresponding position via a coupling.

[0016] The beneficial effects of this invention are: The present invention discloses a welding device for ventilation ducts in civil defense engineering, which adopts a dual-station tooling, allowing welding and loading / unloading to be carried out simultaneously, resulting in high processing efficiency. The tooling is rotated as a whole to achieve station switching, and the linkage self-locking structure automatically completes the locking and releasing of the workpiece, eliminating the need for additional manual locking operations and making it convenient to use.

[0017] The present invention discloses a welding device for ventilation ducts in civil defense engineering buildings. The self-locking structure incorporates a piston-type air pump structure. Compressed air is generated by the mechanical pushing force during the rotation and switching of the tooling. This air is supplied to the air nozzle to perform online purging of the weld area, promptly removing welding slag and debris. This achieves mechanical linkage between rotation and air supply purging, eliminating the need for an additional air source, saving energy, and featuring a compact structure.

[0018] The present invention discloses a welding device for air ducts in civil defense engineering, which integrates a weld grinding part inside the annular sleeve. This part can directly grind the weld protrusions after welding, reducing process steps and further improving production efficiency and product quality. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is the whole of the invention; Figure 2 This is a diagram of the dual-station tooling of the present invention; Figure 3 For the present invention Figure 1 Enlarged view of point A in the middle; Figure 4 For the present invention Figure 2 Enlarged view of point B in the middle; Figure 5 This is a schematic diagram of the arc-shaped push plate structure of the present invention; Figure 6 This is a schematic diagram of the self-locking structure of the present invention; Figure 7 This is a schematic diagram of the weld grinding section of the present invention; Figure 8 This is a schematic diagram of the servo geared motor of the present invention; In the diagram: 1. T-shaped seat; 11. Bottom support platform; 12. Servo geared motor; 2. Dual-station fixture; 21. Middle cylinder; 211. Shaft head; 22. Workpiece support sleeve; 221. Support sleeve; 23. Arc-shaped push plate; 231. Support wheel; 232. First spring; 233. Sleeve; 234. Inner rod; 24. Drive wheel groove; 25. Support wheel groove; 26. Support frame; 27. First servo electric cylinder; 28. Drive structure; 281. Inner frame; 282. Drive wheel; 283. Servo drive motor; 284. First... 1. Sprocket; 2. First chain; 3. Welding machine; 4. Ring sleeve; 41. Support platform; 42. Air nozzle; 43. Ring air distribution pipe; 44. Welding operation port; 5. Self-locking structure; 51. Rectangular frame; 52. Piston sleeve; 53. Piston; 54. Second spring; 55. U-shaped wheel frame; 56. Roller; 57. One-way air intake valve; 6. Weld grinding section; 61. T-shaped support frame; 62. Grinding wheel; 63. Drive motor; 64. Second sprocket; 65. Second chain; 66. Second servo electric cylinder; 67. Guide column. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0022] As one embodiment of the present invention, such as Figures 1 to 8 As shown, the present invention provides a welding device for air ducts in civil defense engineering buildings, including a T-shaped seat 1 and a double-station fixture 2. Two sets of T-shaped seats 1 are provided, respectively located at both ends of the double-station fixture 2. A bottom support platform 11 is welded and fixed between the two sets of T-shaped seats 1, and a welding machine 3 is provided on one side of the bottom support platform 11.

[0023] The dual-station fixture 2 includes a central cylinder 21 and two sets of workpiece support sleeves 22. The shaft ends 211 at both ends of the central cylinder 21 are rotatably connected to the T-shaped seats 1 through bearing seats. A servo reduction motor 12 is installed on the outer side of one set of T-shaped seats 1, and its drive end is connected to the corresponding shaft end 211 to drive the dual-station fixture 2 to complete a 180-degree rotation.

[0024] Each workpiece support sleeve group 22 consists of two sets of support sleeves 221 coaxially welded to the side of the middle cylinder 21. The top and bottom surfaces of the support sleeves 221 are respectively provided with support wheel grooves 25 and drive wheel grooves 24. The two sets of workpiece support sleeve groups 22 are arranged upside down, with the support wheel grooves 25 on the top and the drive wheel grooves 24 on the bottom of one set; the other set is the opposite. Thus, when the dual-station fixture 2 rotates 180 degrees, the position of the newly entered workpiece support sleeve group 22 is completely consistent with the previous set, achieving seamless switching.

[0025] An arc-shaped push plate 23 is provided on the outer periphery of the support sleeve 221 near the support wheel groove 25. Support wheels 231 are mounted on both sides of its inner side. The middle area is connected to the support sleeve 221 through an elastic connection structure composed of a sleeve 233, an inner rod 234, and a first spring 232. Under the normal tension of the first spring 232, the support wheels 231 are retracted to the outside of the support wheel groove 25.

[0026] A support frame 26 is welded to the side of the support sleeve 221 near the drive wheel groove 24, and a drive structure 28 is installed inside it, with a first servo cylinder 27 mounted on top. A drive wheel 282 with a rubber surface is mounted at one end of the inner frame 281 of the drive structure 28, and a servo drive motor 283 is mounted at the other end. The two are driven by a first sprocket 284 and a first chain 285. When the first servo cylinder 27 pushes down the inner frame 281, the drive wheel 282 passes through the drive wheel groove 24 and presses into the inner cavity of the support sleeve 221 to drive the workpiece to rotate.

[0027] A self-locking structure 5 is provided on the top of the bottom support platform 11 near the welding machine 3. The rectangular frame 51 of the self-locking structure 5 contains two sets of piston sleeves 52 and pistons 53. A U-shaped wheel frame 55 with rollers 56 is fixed to the top of the pistons 53, and a second spring 54 is fitted around the outer periphery of the pistons 53. When the arc-shaped push plate 23, located at the welding station, rotates with the fixture to directly above the self-locking structure 5, the rollers 56 lift the arc-shaped push plate 23, causing it to move upwards against the elastic force of the first spring 232. The support wheel 231 enters the support sleeve 221 through the support wheel groove 25, lifting the ductwork body upwards and pressing it against the drive wheel 282, automatically completing the coaxial rolling lock. After welding, the fixture rotates again, the arc-shaped push plate 23 disengages from the rollers 56, the support wheel 231 retracts, and the workpiece is released for easy unloading.

[0028] The annular sleeve 4 is fitted around the outer circumference of the middle cylinder 21, located between two coaxial sets of support sleeves 221. Its internal support platform 41 and side walls are equipped with several air nozzles 42, which are supplied with air through an annular air distribution pipe 43. A welding operation port 44 is opened on one side of the annular sleeve 4. The support platform 41 also integrates a weld grinding section 6, which is driven by a second servo electric cylinder 66 to raise and lower a U-shaped support frame 61. A drive motor 63 drives a grinding wheel 62 via chain transmission to grind the weld protrusions.

[0029] One-way air inlet valves 57 are installed at the bottom and side bottom of the piston sleeve 52. The side air inlet valve has an air filter, and the bottom exhaust valve is connected to the annular air distribution pipe 43 through a pipe. Whenever the dual-station fixture 2 rotates to switch stations, the arc-shaped push plate 23 presses or releases the piston 53, generating piston movement, automatically drawing in outside air and discharging it into the annular air distribution pipe 43, and finally spraying it out from the air nozzle 42 to blow away welding slag and debris from the weld. This process synchronously transforms the main action of "fixture rotation switching" into two driven actions: "workpiece self-locking / release" and "air supply for purging," achieving mechanical linkage without the need for an additional air source or control.

[0030] Working principle of this invention: In the initial state, the workpiece support sleeve 22 on one side of the dual-station fixture 2 serves as the loading station, and this station is located in an area far from the welding machine 3. The operator inserts two sections of circular building ductwork to be welded into the two coaxial support sleeves 221 of the workpiece support sleeve 22. The arc-shaped push plate 23 is not under the action of the self-locking structure 5 and is in a natural state under the elastic force of the first spring 232. The support wheel 231 is located outside the support wheel groove 25, and the inner cavity of the support sleeve 221 is unobstructed, allowing the ductwork to be inserted smoothly. Subsequently, the output end of the first servo electric cylinder 27 extends, pushing the inner frame 281 towards the support sleeve 221, causing the drive wheel 282 to pass through the drive wheel groove 24 and enter the inner cavity of the support sleeve 221, contacting the top of the outer wall of the ductwork, providing initial positioning for the ductwork. Subsequently, the servo reduction motor 12 starts, driving the dual-station fixture 2 to rotate 180 degrees through the shaft head 211. The loaded workpiece support sleeve 22 rotates and enters the welding station of the welding machine 3. During the rotation into position, the two sets of arc-shaped push plates 23 of the workpiece support sleeve 22 move synchronously to directly above the self-locking structure 5 on the bottom support platform 11. At this time, the bottom surface of the arc-shaped push plate 23 contacts the roller 56 of the self-locking structure 5, and the roller 56 pushes the arc-shaped push plate 23 upward. The arc-shaped push plate 23 overcomes the elastic force of the first spring 232 and moves upward, driving the support wheel 231 on it to pass through the support wheel groove 25 and enter the inner cavity of the support sleeve 221. The support wheel 231 pushes the air duct upward from the bottom, so that the top of the outer wall of the air duct is in close contact with the bottom surface of the already positioned drive wheel 282. At this time, the output end of the first servo electric cylinder 27 can retract a certain stroke to ensure that while the drive wheel 282 presses the air duct, it ensures that the air duct does not contact the inner wall of the support sleeve 221. At the same time, based on the elastic force of the spring, the roller 56 maintains rolling support for the bottom of the air duct. At this point, the drive wheels 282 on the two coaxial support sleeves 221 form a height limit on the top of the duct, and the support wheels 231 form a lifting support on the bottom of the duct. The two duct sections automatically complete coaxial rolling locking within the support sleeves 221. The welding torch of the welding machine 3 extends through the welding operation port 44 on the annular sleeve 4 and is aligned with the joint of the two duct sections. The servo drive motor 283 starts, driving the drive wheel 282 to rotate through the first sprocket 284 and the first chain 285. The drive wheel 282 uses the friction between its rubber surface layer and the outer wall of the duct to drive the two duct sections to rotate synchronously and uniformly under the rolling support of the support wheels 231. The welding machine 3 performs circumferential welding on the rotating joint. During the welding process, the output end of the second servo electric cylinder 66 extends, pushing the convex support frame 61 to rise along the guide column 67, bringing the grinding wheel 62 closer to the duct weld. The drive motor 63 starts and drives the grinding wheel 62 to rotate through the second sprocket 64 and the second chain 65 to perform online grinding of the weld protrusion formed by welding.After welding is completed, the workpiece support sleeve 22, which was originally located at the welding station and has already been welded, is rotated to the loading station. Its arc-shaped push plate 23 disengages from the self-locking structure 5, the support wheel 231 retracts, and the air duct loses its lock, allowing the operator to unload and reload the workpiece. During the 180-degree rotation of the dual-station fixture 2 to switch stations, the arc-shaped push plate 23 exerts downward pushing force on the roller 56 and U-shaped wheel frame 55 in the self-locking structure 5. The U-shaped wheel frame 55 compresses the second spring 54 and pushes the piston 53 downward within the piston sleeve 52, completing the piston's compression stroke. The gas inside the piston sleeve 52 is discharged through the one-way air inlet valve 57 at the bottom, enters the annular air distribution pipe 43 through the pipe, and is finally sprayed out by the air nozzles 42 distributed on the inner wall of the annular sleeve 4 and the support platform 41, aiming at the weld area for real-time blowing to remove welding slag and debris generated during welding and grinding. When the workstation switches again and the arc-shaped push plate 23 disengages from the self-locking structure 5, the second spring 54 pushes the U-shaped wheel frame 55 and piston 53 upward to reset, completing the suction stroke. After being filtered, outside air enters the inner cavity of the piston sleeve 52 through the one-way air inlet valve 57 on the side of the piston sleeve 52, storing energy for the next purging. This process repeats, using the mechanical action linkage of the tooling rotation to achieve intermittent automatic air supply purging without the need for an additional air source. After the above is completed, the servo reduction motor 12 drives the dual-station tooling 2 to rotate 180 degrees again, realizing the reversal of the welding station and the loading station. The welded and ground workpiece moves out of the welding area with the rotation, automatically unlocks and is unloaded, and the newly loaded workpiece enters the welding area and is automatically locked again. This cycle continues, continuously realizing the automated linkage operation of loading, locking, welding, grinding, purging and unloading of air duct welding processing.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A welding device for ventilation ducts in civil defense engineering buildings, characterized in that, It includes a T-shaped seat (1) and a double-station fixture (2). The T-shaped seat (1) is provided in two sets and is respectively located at both ends of the double-station fixture (2). A bottom support platform (11) is welded and fixed between the two sets of T-shaped seats (1). A welding machine (3) is provided on one side of the bottom support platform (11). The dual-station tooling (2) includes two sets of workpiece support sleeves (22) and a middle cylinder (21) located in the middle between the two sets of workpiece support sleeves (22). Each set of workpiece support sleeves (22) consists of two sets of coaxially arranged support sleeves (221), and the support sleeves (221) are welded and fixed to the middle cylinder (21). The two ends of the middle cylinder (21) are fixedly provided with shaft heads (211), and the shaft heads (211) are rotatably connected to the corresponding T-shaped seats (1) through bearing seats.

2. The welding device for ventilation ducts in civil defense engineering buildings according to claim 1, characterized in that, The top and bottom surfaces of the support sleeve (221) are respectively provided with support wheel groove (25) and drive wheel groove (24). The two sets of workpiece support sleeves (22) are arranged in reverse order. In one set of workpiece support sleeves (22), the support wheel groove (25) of the support sleeve (221) is located at the top of the support sleeve (221), and the drive wheel groove (24) is located at the bottom of the support sleeve (221). In the other set of workpiece support sleeves (22), the support wheel groove (25) of the support sleeve (221) is located at the bottom of the support sleeve (221), and the drive wheel groove (24) is located at the top of the support sleeve (221). After the dual-station fixture (2) rotates 180 degrees, the positions of the two sets of workpiece support sleeves (22) are swapped. However, the position of the swapped workpiece support sleeve (22) is exactly the same as the position of the upper workpiece support sleeve (22).

3. The welding device for ventilation ducts in civil defense engineering buildings according to claim 2, characterized in that, An arc-shaped push plate (23) is provided on the outer periphery of the support sleeve (221) near the support wheel groove (25). Support wheels (231) are respectively installed on both sides of the arc-shaped push plate (23) near the support wheel groove (25) via wheel frames. An elastic connection structure is provided on the arc-shaped push plate (23) and in the area between the support wheels (231). The elastic connection structure includes a sleeve (233). An inner rod (234) is inserted into the top of the sleeve (233). The inner rod (234) is welded and fixed to the support sleeve (221) at the corresponding position. A first spring (232) is sleeved on the outer periphery of the inner rod (234) and the sleeve (233). The two ends of the first spring (232) are respectively welded and fixed to the arc-shaped push plate (23) and the support sleeve (221) at the corresponding positions.

4. The welding device for ventilation ducts in civil defense engineering buildings according to claim 3, characterized in that, A support frame (26) is welded to the side of the outer periphery of the support sleeve (221) near the drive wheel groove (24). A drive structure (28) is provided inside the support frame (26). A first servo electric cylinder (27) is installed on the top of the support frame (26). The drive structure (28) includes an inner frame (281). A drive wheel (282) is rotatably mounted on one end of the inner frame (281) near the drive wheel groove (24) via a bearing. A rubber surface layer is bonded to the outer surface of the drive wheel (282). A servo drive motor (283) is bolted to the other end of the inner frame (281). The drive end of the servo drive motor (283) and the shaft head of one end of the drive wheel (282) both extend to the outside of the inner frame (281) and are respectively fixedly mounted with first sprockets (284). The first sprockets (284) are connected to each other by a first chain (285). The output end of the first servo electric cylinder (27) is fixedly mounted to the end of the inner frame (281) away from the drive wheel (282).

5. The welding device for ventilation ducts in civil defense engineering buildings according to claim 4, characterized in that, The bottom support platform (11) is provided with a self-locking structure (5) on the side of the top of the welding machine (3). There are at least two sets of self-locking structures (5), which are in contact with the bottom of the arc-shaped push plate (23) on the side of the welding machine (3).

6. The welding device for ventilation ducts in civil defense engineering buildings according to claim 5, characterized in that, The self-locking structure (5) includes a rectangular frame (51), which is located at the bottom of the bottom support platform (11) and is fixed to the bottom support platform (11) by bolts. Piston sleeves (52) are fixedly installed at both ends of the rectangular frame (51), and a piston (53) is inserted at the top of the piston sleeve (52). The top of the piston (53) passes through the rectangular frame (51) and the bottom support platform (11) in sequence, and a U-shaped wheel frame (55) is installed by bolts. Rollers (56) for pushing the arc-shaped push plate (23) are installed at both ends of the top of the U-shaped wheel frame (55), and a second spring (54) is sleeved at the bottom of the U-shaped wheel frame (55) and on the outer periphery of the piston (53).

7. The welding device for ventilation ducts in civil defense engineering buildings according to claim 6, characterized in that, The double-station tooling (2) is fitted with an annular sleeve (4) in the middle of its outer periphery, and the annular sleeve (4) is located between two sets of coaxial support sleeves (221). A support platform (41) is welded to the bottom of the annular sleeve (4). Air nozzles (42) are installed at equal distances on both sides of the top of the support platform (41) and on both sides of the inner wall of the annular sleeve (4). Annular air distribution pipes (43) are installed on both sides of the outer periphery of the annular sleeve (4) by clamps, and the exhaust end of the annular air distribution pipe (43) is connected to the air inlet end of the air nozzle (42). A welding operation port (44) for the welding machine (3) to extend into is opened on one side of the annular sleeve (4).

8. The welding device for ventilation ducts in civil defense engineering buildings according to claim 7, characterized in that, The support platform (41) has a weld grinding part (6) on the side of the top near the welding machine (3). The weld grinding part (6) includes a U-shaped support frame (61). A grinding wheel (62) is provided at the top of the U-shaped support frame (61). The shaft ends of the grinding wheel (62) are rotatably connected to the U-shaped support frame (61). A drive motor (63) is provided at the bottom of the U-shaped support frame (61). The drive end of the drive motor (63) and the shaft end of one end of the grinding wheel (62) both pass through the U-shaped support frame (61) and are equipped with second sprockets (64). The second sprockets (64) are connected to each other by a second chain (65). A second servo electric cylinder (66) is installed on one side of the bottom of the support platform (41). The output end of the second servo electric cylinder (66) passes through the support platform (41) and is fixed to the bottom of the convex support frame (61). Guide columns (67) are installed at both ends of the bottom of the convex support frame (61), and the guide columns (67) pass through the bottom of the support platform (41).

9. A welding device for ventilation ducts in civil defense engineering structures according to claim 8, characterized in that, One-way air intake valves (57) are installed at the bottom end and one side bottom of the piston sleeve (52), and an air filter valve is provided at the air intake end of the one-way air intake valve (57) located at the bottom side of the piston sleeve (52). The exhaust end of the one-way air intake valve (57) located at the bottom end of the piston sleeve (52) is connected to the air intake end of the annular air distribution pipe (43) through a pipe.

10. A welding device for ventilation ducts in civil defense engineering structures according to claim 9, characterized in that, One of the T-shaped seats (1) is equipped with a servo geared motor (11) on its outer side. The drive end of the servo geared motor (11) is connected to the shaft head (211) at the corresponding position via a coupling.

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