Air pipe welding and positioning device for heating and ventilation engineering

Abstract

The invention relates to the technical field of welding positioning, and discloses an air pipe welding positioning device for heating and ventilation engineering, which comprises a machine table, a groove is formed in the middle of the machine table, two pushing frames are fixedly mounted on the groove, and a guide driving mechanism and a pipe outer joint surface positioning mechanism are respectively arranged at the top and the bottom of each pushing frame. A pipe inner joint face positioning mechanism is arranged on one side of the pushing frame, the guide driving mechanism comprises a top plate, a plurality of movable adaptive blocks and static adaptive blocks are arranged on the top plate in a staggered mode, a pushing-out piece and a pushing-in piece are fixedly installed on the two sides of the bottom of the top plate respectively, and the pushing-in piece is close to the end face of the pushing frame. By means of the pipe outer joint face positioning mechanism and the pipe inner joint face positioning mechanism, firstly, after the air pipe stops moving, the insufficient bending position is extruded, the inward excessive bending position is supported in the air pipe, the welding precision is improved, and operation is convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding positioning, in particular to a duct welding positioning device for heating and ventilation engineering. BACKGROUND

[0002] The heating and ventilation duct is a core channel component for conveying air in a heating and ventilation air conditioning system, mainly functions to accurately convey the treated air to the target area, and discharge the indoor dirty air, is a key carrier for guaranteeing indoor air quality, temperature and humidity regulation, and is widely used in residential, commercial buildings, industrial plants and other scenes.

[0003] In the prior art, when the duct is produced, the metal plate is bent to form a square tube, and then the unbent section is welded to form a formed product with good sealing performance and air conveying performance, so it is necessary to ensure the welding precision during welding to prevent the use performance from being reduced due to the deviation of the duct. After the duct is bent and formed, according to different metal plate materials and bending processes, excessive bending or insufficient bending may occur. Before welding, the defective part needs to be positioned to align the welding part, and when excessive bending and insufficient bending occur, it is not convenient to position the welding part of the duct. Therefore, we propose a duct welding positioning device for heating and ventilation engineering to solve the above problems. SUMMARY

[0004] The purpose of the present application is to provide a duct welding positioning device for heating and ventilation engineering to solve the problems raised in the background art. To achieve the above purpose, the present application provides the following technical solution: a machine table is provided, a recess is formed in the middle of the machine table, two pusher frames are fixedly installed in the recess, a guide driving mechanism and a pipe outer joint surface positioning mechanism are arranged at the top and bottom of the pusher frame respectively, and a pipe inner joint surface positioning mechanism is arranged on one side of the pusher frame.

[0005] The guide driving mechanism comprises a top plate, a plurality of movable and stationary adapter blocks are arranged on the top plate in a staggered manner, a push-out piece and a push-in piece are fixedly installed on the both sides of the bottom of the top plate, and the end face of the push-in piece is close to the pusher frame.

[0006] A driving motor is arranged above the middle of the machine table, an axle disc is rotatably installed at the output end of the driving motor, a plurality of driving covers are arranged around one side of the surface of the axle disc, a check piece is fixedly installed on the other side, a center shaft is fixedly connected at the center of the axle disc, and an insertion strip is elastically connected to the side away from the axle disc of the center shaft.

[0007] A rotating column is fixedly connected to the central shaft, and a curved plate is fixedly connected to the surface of the rotating column. The curved plate is wedge-shaped and is located on the same horizontal line as the check plate. A retaining ring is fixedly connected to the side of the rotating column near the insert, and the end of the insert is movably engaged on the inner surface of the retaining ring.

[0008] A swing arm is provided on the side of the rotating column, and a guide wheel is rotatably mounted on the top of the swing arm near the rotating column. The surface of the guide wheel is in frictional contact with the curved plate.

[0009] The drive cover engages with the movable adapter block.

[0010] Preferably, the positioning mechanism for the outer joint surface of the tube includes a mounting frame fixedly connected to the machine base. Side grooves are respectively opened horizontally and vertically on one side of the surface of the mounting frame. The middle parts of the rotating column and the swing arm are rotatably connected to the mounting frame. A rack is slidably arranged on the mounting frame. The top of the rack meshes with the bottom of the swing arm. A return spring is movably sleeved at the connection between the side of the rack and the mounting frame.

[0011] Preferably, an installation bracket is slidably disposed in the side groove, and the top and side of the two side grooves are respectively provided with a narrow strip that is fixedly connected to the mounting frame, and a lifting shaft is movably sleeved on the installation bracket.

[0012] Preferably, a guide roller is rotatably connected to the top of the lifting shaft, the guide roller is disposed inside the constriction strip, and a pressure roller is rotatably installed at the bottom of the lifting shaft.

[0013] Preferably, a connecting strip is fixedly connected to the mounting bracket, and a drive shaft is fixedly connected to the side of the rack. One of the connecting strips located on the upper part of the mounting frame is fixedly connected to the rack, and the top of the other connecting strip located on the side of the mounting frame abuts against a first reversing frame, the top of which abuts against the drive shaft.

[0014] Preferably, the tube mating surface positioning mechanism includes a central shaft fixedly connected to the end face of the pusher and a second reversing frame rotatably mounted on the mounting frame, the top of the second reversing frame abutting against the end of the rack.

[0015] Preferably, the bottom of the second reversing frame abuts against a trigger bar, the trigger bar is slidably connected to the machine base, a rocker is movably inserted into the end of the trigger bar away from the second reversing frame, the rocker is rotatably connected to the machine base, and a notch is provided on the side of the machine base near the central axis.

[0016] Preferably, a sleeve is slidably disposed on the central shaft, and a support shaft is fixedly installed on the side of the sleeve near the rocker, the support shaft abutting against the rocker.

[0017] Preferably, the central shaft is provided with a movable hinge and two fixed hinges below the mounting bracket. The movable hinge is connected to the end face of the sleeve and slidably connected to the central shaft. The fixed hinge is fixedly connected to the central shaft. A release spring is movably sleeved between one of the fixed hinges and the movable hinge. Right-angle supports are hinged to the movable hinge and the two fixed hinges.

[0018] Preferably, the connection points of the movable hinge and the fixed hinge with the right-angle support are located within the included angle range formed by the two side grooves, and are set at a 45-degree inclination angle.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] In this invention, when welding the air duct, the air duct is automatically pushed intermittently so that every part of the air duct passes through the welding position, and the welding can be completed without moving the welding equipment. After welding, the air duct is automatically pushed out.

[0021] In this invention, by setting up an external joint surface positioning mechanism and an internal joint surface positioning mechanism, during welding, after the duct stops moving, two pressure rollers press against the outer wall of the duct and move closer to each other to press the insufficiently bent area. Inside the duct, a right-angle support bar fits against the inner wall of the duct to be welded, forming a right angle and supporting the excessively bent area, thereby improving welding accuracy and facilitating operation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the front structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the guiding drive mechanism of the present invention;

[0025] Figure 4 This is a schematic diagram of the insert, retaining ring, and curved plate of the present invention;

[0026] Figure 5 For the present invention Figure 1 Enlarged structural diagram of region A in the middle;

[0027] Figure 6 This is a schematic diagram of the structure of the central shaft and the pusher frame of the present invention;

[0028] Figure 7 This is a schematic diagram of the positioning mechanism for the inner joint surface of the pipe according to the present invention;

[0029] Figure 8 For the present invention Figure 7 A magnified structural diagram of region B in the middle.

[0030] In the picture:

[0031] 1. Machine tool;

[0032] 2. Groove;

[0033] 3. Push rack;

[0034] 4. Guide drive mechanism; 401. Top plate; 402. Movable adapter block; 403. Stationary adapter block; 404. Push-out component; 405. Push-in component; 406. Drive motor; 407. Shaft disc; 408. Drive cover; 409. Check valve; 410. Central shaft; 411. Insert bar; 412. Rotary column; 413. Curved plate; 414. Gear ring; 415. Swing arm; 416. Guide wheel;

[0035] 5. Pipe external joint surface positioning mechanism; 501. Mounting bracket; 502. Side groove; 503. Rack; 504. Return spring; 505. Mounting angle bracket; 506. Narrowing strip; 507. Lifting shaft; 508. Guide roller; 509. Pressure roller; 510. Connecting strip; 511. Drive shaft; 512. First reversing frame;

[0036] 6. Inner pipe joint surface positioning mechanism; 601. Central shaft; 602. Second reversing frame; 603. Trigger crossbar; 604. Rocker; 605. Sleeve; 606. Support shaft; 607. Moving hinge frame; 608. Fixed hinge frame; 609. Release spring; 610. Right angle support bar. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figures 1 to 8 The machine includes a machine base 1, a groove 2 is provided in the middle of the machine base 1, and two pusher frames 3 are fixedly installed in the groove 2. The top and bottom of the pusher frame 3 are respectively provided with a guide drive mechanism 4 and a tube outer joint surface positioning mechanism 5, and a tube inner joint surface positioning mechanism 6 is provided on one side of the pusher frame 3.

[0039] Example 1:

[0040] Please see Figures 1 to 4This embodiment provides a technical solution: the guide drive mechanism 4 includes a top plate 401, on which a plurality of movable adapter blocks 402 and stationary adapter blocks 403 are respectively staggered. Pushing members 404 and pushing members 405 are respectively fixedly installed on the bottom two sides of the top plate 401, and the pushing members 405 are close to the end face of the push frame 3.

[0041] A drive motor 406 is installed above the middle of the machine base 1. A shaft disk 407 is rotatably mounted on the output end of the drive motor 406. Several drive covers 408 are arranged around one side of the surface of the shaft disk 407, and a check plate 409 is fixedly installed on the other side. A central shaft 410 is fixedly connected to the shaft center of the shaft disk 407. An insert 411 is elastically connected to the side of the central shaft 410 away from the shaft disk 407.

[0042] A rotating column 412 is fixedly connected to the central shaft 410. A curved plate 413 is fixedly connected to the surface of the rotating column 412. The curved plate 413 is wedge-shaped and is located on the same horizontal line as the check plate 409. A retaining ring 414 is fixedly connected to the side of the rotating column 412 near the insert 411. The end of the insert 411 is movably engaged on the inner surface of the retaining ring 414.

[0043] A swing arm 415 is provided on the side of the rotating column 412. A guide wheel 416 is rotatably mounted on the top of the swing arm 415 near the rotating column 412. The surface of the guide wheel 416 is in frictional contact with the curved plate 413.

[0044] The drive cover 408 engages with the movable adapter block 402 respectively;

[0045] In this embodiment, before welding the duct, the bent duct is first placed on one side of the groove 2, between the pusher 404 and the pusher 405, so that the welding area of ​​the duct is located on one side of the angle area formed by the two side grooves 502. At this time, the drive motor 406 is started, and the shaft disk 407 rotates forward, driving the drive cover 408 to engage with the movable adapter block 402 on the top plate 401. Through the pusher 405, the top plate 401 pushes the duct to be welded forward. After moving a certain distance, the drive cover 408 is disconnected from the movable adapter block 402, and then the check plate 409 is on the stationary adapter block 402. 03. The duct remains stationary during the rotation. During this process, the insert 411 is engaged in the toothed ring 414, causing the toothed ring 414 to rotate synchronously. This causes the curved plate 413 on the rotating column 412 to rotate half a turn. During the rotation, the curved plate 413 presses against the guide wheel 416, causing the guide wheel 416 to drive the swing arm 415 to swing around its connection with the mounting bracket 501. The bottom of the swing arm 415 drives the rack 503, which meshes with it, to slide outward, compressing the return spring 504. After the curved plate 413 rotates half a turn, the guide wheel 416 directly disconnects from it, allowing the swing arm 415 to quickly return to its original position.

[0046] In this embodiment, after the welding of the air duct is completed, the drive motor 406 is reversed and the air duct is pushed outward by the push-out part 404. During the process, according to the set insert 411 and retaining ring 414, when the shaft disk 407 reverses, the insert 411 retracts into the center shaft 410 and does not engage with the retaining ring 414. Therefore, the swing arm 415 will not be triggered to swing, and the two pressure rollers 509 remain stationary.

[0047] Example 2:

[0048] Please see Figures 5 to 6 This embodiment provides a technical solution: the pipe outer joint surface positioning mechanism 5 includes a mounting frame 501 fixedly connected to the machine base 1. Side grooves 502 are respectively opened horizontally and vertically on one side of the surface of the mounting frame 501. The middle parts of the rotating column 412 and the swing arm 415 are rotatably connected to the mounting frame 501. A rack 503 is slidably arranged on the mounting frame 501. The top of the rack 503 meshes with the bottom of the swing arm 415. A return spring 504 is movably sleeved at the connection between the side of the rack 503 and the mounting frame 501.

[0049] An installation bracket 505 is slidably disposed in the side groove 502. The top and side of the two side grooves 502 are respectively provided with a narrow strip 506 that is fixedly connected to the mounting bracket 501. A lifting shaft 507 is movably sleeved on the installation bracket 505.

[0050] A guide roller 508 is rotatably connected to the top of the lifting shaft 507, and the guide roller 508 is set inside the constriction strip 506. A pressure roller 509 is rotatably installed at the bottom of the lifting shaft 507.

[0051] A connecting strip 510 is fixedly connected to the mounting bracket 505, and a drive shaft 511 is fixedly connected to the side of the rack 503. One of the connecting strips 510 located on the upper part of the mounting bracket 501 is fixedly connected to the rack 503, and the top of the other connecting strip 510 located on the side of the mounting bracket 501 abuts against the first reversing frame 512. The top of the first reversing frame 512 abuts against the drive shaft 511.

[0052] In this embodiment, for the bent duct, since its sides are not closed, the plates on both sides of the weld joint may open outward or retract inward. During welding, it is necessary to apply pressure inward or pry the duct open outward to perform precise welding. Therefore, during the outward pulling of the rack 503, the connecting strip 510 installed on one side pulls the mounting bracket 505 at the top of the duct closer to the weld joint. During this process, the lifting shaft 507 is on the mounting bracket 505, and the guide roller 508 at its top gradually descends to the bottom due to the restriction of the narrowing strip 506, which compresses the spring between the lifting shaft 507 and the mounting bracket 505. The pressure roller 509 at the bottom of the lifting shaft 507 gradually... Near the welding area of ​​the duct, during this process, the outward-opening area of ​​the duct can be squeezed, its bending angle can be corrected, and the welding area of ​​the duct can be positioned. Similarly, the connecting strip 510 located on the side of the duct, when the rack 503 slides outward, pushes the first reversing frame 512 through the transmission shaft 511 to make it rotate. The bottom of the first reversing frame 512 pulls the connecting strip 510 upward, so that another lifting shaft 507 performs the same action as the top lifting shaft 507, squeezing the side of the duct, so that the outward-opening area on its side is corrected. The two corrected areas are corrected to be close to each other and form a right angle area, which is convenient for welding. After being corrected, welding can be performed directly at this point.

[0053] Example 3:

[0054] Please see Figures 7 to 8 This embodiment provides a technical solution: the tube joint surface positioning mechanism 6 includes a central shaft 601 fixedly connected to the end face of the pusher 3 and a second reversing frame 602 rotatably mounted on the mounting frame 501, the top of the second reversing frame 602 abutting against the end of the rack 503;

[0055] The bottom of the second reversing frame 602 abuts against a trigger crossbar 603. The trigger crossbar 603 is slidably connected to the machine base 1. A rocker 604 is movably inserted into the end of the trigger crossbar 603 away from the second reversing frame 602. The rocker 604 is rotatably connected to the machine base 1. A notch is opened on the side of the machine base 1 near the central shaft 601.

[0056] A sleeve 605 is slidably mounted on the central shaft 601, and a support shaft 606 is fixedly installed on the side of the sleeve 605 near the rocker plate 604, with the support shaft 606 abutting against the rocker plate 604.

[0057] The central shaft 601 is located below the mounting bracket 501 and is provided with a movable hinge bracket 607 and two fixed hinge brackets 608. The movable hinge bracket 607 is connected to the end face of the sleeve 605 and is slidably connected to the central shaft 601. The fixed hinge bracket 608 is fixedly connected to the central shaft 601, and a release spring 609 is movably sleeved between one of the fixed hinge brackets 608 and the movable hinge bracket 607. Right-angle support bars 610 are hinged to the movable hinge bracket 607 and the two fixed hinge brackets 608.

[0058] The connection points of the movable hinge frame 607 and the fixed hinge frame 608 with the right-angle support 610 are located within the included angle range formed by the two side grooves 502, and are set at a 45-degree inclination angle.

[0059] In this embodiment, during the compression process outside the duct, the inwardly retracting plates need to be simultaneously pried open outwards to align the two plates. The rack 503 slides outwards, pushing the second reversing frame 602 to rotate. Its bottom triggers the horizontal bar 603 to push, which in turn pushes the rocker arm 604 on the other side to rotate. The rocker arm 604, via the support shaft 606, pushes the sleeve 605 to slide to one side on the central shaft 601. This is achieved through the movable hinge frame 607 and the fixed hinge... The hinge 608 allows the sleeve 605 to slide, and the three hinges support the right-angle support 610. According to the set tilt angle, the right-angle support 610 moves towards the duct welding joint, and its surface is in contact with the right-angle area formed by the pressure roller 509 at the duct welding joint. This allows the right-angle support 610 to support this area inside the duct, and to push the plate that is inward into the duct outward. The two plates at the welding joint are automatically aligned, and the duct can be directly welded or fully welded.

[0060] The method of use and advantages of the present invention: The working process of this duct welding positioning device for HVAC engineering is as follows:

[0061] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown:

[0062] S1: Place the bent air duct in the groove 2, between the push-out part 404 and the push-in part 405, so that the welding area is aligned with the angle of the side groove 502. The push-in part 405 is moved forward by the shaft plate 407, drive cover 408 and other components. After the air duct moves a certain distance, the drive component disconnects. The check plate 409 stops the air duct. At the same time, the insert 411 drives the toothed ring 414 to rotate, so that the curved plate 413 squeezes the guide wheel 416, causing the swing arm 415 to swing and pull the rack 503 to slide out. Then the curved plate 413 separates from the guide wheel 416 and the swing arm 415 returns to its position.

[0063] S2: When the rack 503 slides out, the top mounting bracket 505 is pulled closer to the welding joint by the connecting strip 510. The guide roller 508 on the lifting shaft 507 is restricted to descend by the necking strip 506. The pressure roller 509 gradually approaches the welding area, squeezing the outward expansion area and correcting the bending angle. At the same time, the side connecting strip 510 pushes the reversing frame to rotate, driving the other lifting shaft 507 to move and squeeze the side outward expansion area, so that the two correction areas form a right angle, which is convenient for welding.

[0064] S3: By triggering components such as the crossbar 603 and rocker 604, the sleeve 605 is driven to slide, and the right-angle support bar 610 is supported by the hinge. The right-angle support bar 610 moves towards the welding joint and fits the right-angle area formed by the external pressure roller 509. It supports and expands the inward plate inside the air duct, so that the plates on both sides of the welding joint are automatically aligned, and then can be directly electric welded or fully welded.

[0065] S4: After welding is completed, control the drive motor 406 to reverse and push out the air duct through the push-out part 404.

[0066] 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 preferred examples and are not intended to limit 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 the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A duct welding positioning device for HVAC engineering, characterized in that, The machine includes a machine base (1), a groove (2) is provided in the middle of the machine base (1), and two pushers (3) are fixedly installed in the groove (2). The top and bottom of the pushers (3) are respectively provided with a guide drive mechanism (4) and an outer tube joint surface positioning mechanism (5), and an inner tube joint surface positioning mechanism (6) is provided on one side of the pushers (3). The guide drive mechanism (4) includes a top plate (401), on which a plurality of movable adapter blocks (402) and stationary adapter blocks (403) are respectively staggered. On the bottom sides of the top plate (401), a pusher (404) and a pusher (405) are respectively fixedly installed. The pusher (405) is close to the end face of the pusher frame (3). A drive motor (406) is provided above the middle part of the machine base (1). A shaft disk (407) is rotatably mounted on the output end of the drive motor (406). Several drive covers (408) are arranged around one side of the surface of the shaft disk (407), and a check plate (409) is fixedly installed on the other side. A central shaft (410) is fixedly connected to the shaft center of the shaft disk (407). A strip (411) is elastically connected to the side of the central shaft (410) away from the shaft disk (407). The central shaft (410) is fixedly connected to a rotating column (412), and a curved plate (413) is fixedly connected to the surface of the rotating column (412). The curved plate (413) is wedge-shaped and is located on the same horizontal line as the check plate (409). A retaining ring (414) is fixedly connected to the side of the rotating column (412) near the insert (411). The end of the insert (411) is movably engaged on the inner surface of the retaining ring (414). A swing arm (415) is provided on the side of the rotating column (412). A guide wheel (416) is rotatably installed on the top of the swing arm (415) near the rotating column (412). The surface of the guide wheel (416) is in frictional contact with the curved plate (413). The drive cover (408) engages with the movable adapter block (402).

2. The duct welding positioning device for HVAC engineering according to claim 1, characterized in that: The positioning mechanism (5) for the outer joint surface of the tube includes a mounting frame (501) fixedly connected to the machine base (1). Side grooves (502) are opened horizontally and vertically on one side of the surface of the mounting frame (501). The middle part of the rotating column (412) and the swing arm (415) are rotatably connected to the mounting frame (501). A rack (503) is slidably arranged on the mounting frame (501). The top of the rack (503) meshes with the bottom of the swing arm (415). A return spring (504) is movably sleeved at the connection between the side of the rack (503) and the mounting frame (501).

3. The duct welding positioning device for HVAC engineering according to claim 2, characterized in that: An installation bracket (505) is slidably disposed in the side groove (502). The top and side of the two side grooves (502) are respectively provided with a narrow strip (506) that is fixedly connected to the mounting bracket (501). A lifting shaft (507) is movably sleeved on the installation bracket (505).

4. The duct welding positioning device for HVAC engineering according to claim 3, characterized in that: The top of the lifting shaft (507) is rotatably connected to a guide roller (508), which is disposed inside the constriction strip (506), and the bottom of the lifting shaft (507) is rotatably mounted with a pressure roller (509).

5. The duct welding positioning device for HVAC engineering according to claim 3, characterized in that: A connecting strip (510) is fixedly connected to the mounting bracket (505), and a drive shaft (511) is fixedly connected to the side of the rack (503). One of the connecting strips (510) located on the upper part of the mounting bracket (501) is fixedly connected to the rack (503), and the top of the other connecting strip (510) located on the side of the mounting bracket (501) abuts against a first reversing frame (512), and the top of the first reversing frame (512) abuts against the drive shaft (511).

6. The duct welding positioning device for HVAC engineering according to claim 1, characterized in that: The tube joint surface positioning mechanism (6) includes a central shaft (601) fixedly connected to the end face of the pusher (3) and a second reversing frame (602) rotatably mounted on the mounting frame (501), the top of the second reversing frame (602) abutting against the end of the rack (503).

7. The duct welding positioning device for HVAC engineering according to claim 6, characterized in that: The bottom of the second reversing frame (602) abuts against a trigger bar (603), the trigger bar (603) is slidably connected to the machine base (1), and a rocker (604) is movably inserted into the end of the trigger bar (603) away from the second reversing frame (602). The rocker (604) is rotatably connected to the machine base (1), and a notch is provided on the side of the machine base (1) near the central axis (601).

8. The duct welding positioning device for HVAC engineering according to claim 7, characterized in that: A sleeve (605) is slidably disposed on the central shaft (601), and a support shaft (606) is fixedly installed on the side of the sleeve (605) near the rocker (604), and the support shaft (606) abuts against the rocker (604).

9. The duct welding positioning device for HVAC engineering according to claim 8, characterized in that: The central shaft (601) is located below the mounting bracket (501) and is provided with a movable hinge bracket (607) and two fixed hinge brackets (608). The movable hinge bracket (607) is connected to the end face of the sleeve (605) and is slidably connected to the central shaft (601). The fixed hinge bracket (608) is fixedly connected to the central shaft (601), and a release spring (609) is movably sleeved between one of the fixed hinge brackets (608) and the movable hinge bracket (607). Right-angle supports (610) are hinged to the movable hinge bracket (607) and the two fixed hinge brackets (608).

10. The duct welding positioning device for HVAC engineering according to claim 9, characterized in that: The connection points of the movable hinge frame (607) and the fixed hinge frame (608) with the right-angle support (610) are located within the included angle range formed by the two side grooves (502) and are set at a 45-degree inclination angle.

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