Air duct welding device and welding method

Abstract

The invention discloses a duct welding device and a welding method, belonging to the technical field of welding devices, wherein the duct welding device comprises a base and a column fixedly arranged at one end of the top of the base, a support platform is slidably arranged on one side of the column, a welding groove is arranged at the center of the support platform, a fixed shaft is arranged below the support platform, and a plurality of pressing blocks are evenly arranged at the welding groove on the support platform; through the arranged positioning component, when a pipe fitting with ends staggered from each other is sleeved on the fixed shaft, two arc strips can be staggered from each other, so that one of the arc strips is disconnected from the rotating shaft, and the other rotating shaft can drive the other arc strip to move in the process that the two arc strips can be realigned, so that the shape of the pipe fitting can be corrected, so that the ends of the pipe fitting can be in an aligned state.

Description

Technical Field

[0001] The present invention relates to the technical field of welding devices, and in particular to an air duct welding device and a welding method. Background Art

[0002] In the process of forming cylindrical workpieces, a flat plate is usually bent by a rolling machine, and then the joints are welded to form a cylindrical structure.

[0003] Chinese patent CN212761987U discloses a straight seam welding machine, which can make corresponding adjustments according to the specifications and performance of the workpiece by refining the layout of the clamping structure and flexibly controlling it, and select the number of clamping parts required for the operation, so as to achieve precise fixation, rational use of resources, and reduce unnecessary power loss.

[0004] The above-mentioned device presses the workpiece onto a fixed shaft for welding through the provided clamping member. However, in actual use, when the diameter of the workpiece is large and the length is short, the ends of the workpiece may be misaligned, and it is difficult to correct the shape of the workpiece through the above-mentioned structure, which is not conducive to subsequent welding. In summary, there is still room for improvement in the above-mentioned device.

[0005] Therefore, it is necessary to provide a duct welding device and a welding method to solve the above technical problems. Summary of the invention

[0006] The object of the present invention is to provide a duct welding device and a welding method to solve the problem that the existing device proposed in the above background technology presses the workpiece onto a fixed axis for welding through a clamping member, but in actual use, when the diameter of the workpiece is large and the length is short, the ends of the workpiece may be misaligned, and it is difficult to correct the shape of the workpiece through the above structure, which is not conducive to subsequent welding.

[0007] Based on the above ideas, the present invention provides the following technical solutions: a duct welding device, comprising a base and a column fixedly arranged at one end of the top of the base, a support platform is slidably arranged on one side of the column, a welding groove is arranged at the center of the support platform, and a fixed shaft for supporting the pipe fitting is arranged below the support platform, a plurality of pressure blocks are evenly arranged at the welding groove on the support platform, two arc-shaped strips are sleeved on the outer circumference of the fixed shaft, a slider that slides with the fixed shaft is integrally formed on the inner side of the arc-shaped strip, two rotating shafts are rotatably installed at the fixed shaft, the rotating shaft passes through a preset through hole on the slider, a spiral limiting groove is opened on the outer circumference of the rotating shaft, and a limiting block that slides with the limiting groove is elastically installed on the inner wall of the through hole;

[0008] A boss is provided at the bottom end of the arc-shaped strip, and a positioning assembly connected to the limit block is provided on the boss. When one of the bosses moves toward the direction close to the column and is offset from the other boss, the positioning assembly on the boss will pop out and cause the limit block to disengage from the limit groove, so that the two arc-shaped strips can be realigned during the rotation of the shaft.

[0009] As a further solution of the present invention: a clamping assembly is installed on the outer side surface of the arc strip, and the clamping assembly includes a connecting block arranged on the outside of the arc strip, and a mounting groove is opened on the side of the connecting block away from the column, and two protrusions are elastically installed in the mounting groove, and an electromagnet is arranged between the upper and lower protrusions, the protrusion is made of iron, and a pressure rod is rotatably installed on the end of the protrusion away from the connecting block.

[0010] As a further solution of the present invention: the boss is arranged as an L-shape as a whole, and the positioning assembly includes an L-shaped positioning plate, the positioning plate is elastically matched with the boss, a first groove is provided on the boss and slidingly matched with the positioning plate, arc grooves are provided on the front and rear side walls of the inner cavity of the first groove, a guide block slidingly matched with the arc groove is fixedly arranged on the positioning plate, a traction rope is fixedly arranged between the limit block and the positioning plate, a notch is provided on the inner end surface of the first groove, a positioning block matching with the notch is elastically installed on one end of the positioning plate away from the column, and both sides of the end of the positioning block away from the positioning plate are arranged with inclined extrusion surfaces.

[0011] As a further solution of the present invention: a fixing rod is fixedly arranged on one side surface of the positioning plate close to the column, and clamping strips are elastically installed on both sides of the fixing rod, and the side of the clamping strip away from the fixing rod is an inclined surface, and a clamping groove is opened on the side surface of the positioning plate away from the fixing rod, and the cross-section of the clamping groove is set to be T-shaped.

[0012] As a further solution of the present invention: a convex strip is fixedly installed at the arc top of the fixed shaft.

[0013] As a further solution of the present invention: a cross groove is provided on the outer peripheral surface of the fixed shaft, and the sliding block is slidably disposed in the cross groove.

[0014] As a further solution of the present invention: an end of the limiting groove away from the column is arranged as an inclined guide surface.

[0015] As a further solution of the present invention: vertical straight grooves are provided at both ends of the arc-shaped groove.

[0016] As a further solution of the present invention: the pressure rod is a cylindrical structure, and a rubber pad is provided on the outer fixed sleeve of the pressure rod.

[0017] A method for welding using the above-mentioned duct welding device includes the following steps: sleeve the pipe fitting on the outside of the fixed shaft and push the pipe fitting to the welding position; adjust the position of the pipe fitting so that the interface on the pipe fitting is aligned with the welding groove on the support platform; and press the pipe fitting onto the fixed shaft by a pressing block for welding.

[0018] Compared with the prior art, the beneficial effect of the present invention is that: through the positioning component set up in this device, when a pipe fitting with ends staggered from each other is sleeved on a fixed shaft, the two arc strips can be staggered from each other, so that one of the arc strips is disconnected from the rotating shaft, and the other rotating shaft drives the other arc strip to move, which can prompt the two arc strips to be realigned, thereby correcting the shape of the pipe fitting and making the ends of the pipe fitting be in an aligned state. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 is a ball distribution diagram of the present invention;

[0022] Figure 3 The present invention Figure 2 A schematic diagram of the enlarged structure at point A;

[0023] Figure 4 It is a schematic diagram of the cooperation between the pipe fitting and the fixed shaft of the present invention;

[0024] Figure 5 It is a schematic diagram of the structure of the rotating shaft and the slider of the present invention;

[0025] Figure 6 The present invention Figure 5 A schematic diagram of the enlarged structure at B;

[0026] Figure 7 It is a schematic diagram of the electromagnet and the bump structure of the present invention;

[0027] Figure 8 It is a schematic diagram of the fixed shaft and arc strip structure of the present invention;

[0028] Fig. 9 The present invention Figure 8 A schematic diagram of the enlarged structure at C;

[0029] Fig.10 It is a schematic diagram of the card block structure of the present invention;

[0030] Fig.11 It is a schematic diagram of the limit block and the traction rope structure of the present invention;

[0031] Fig.12 It is a schematic diagram of the card strip structure of the present invention;

[0032] Fig.13 It is a schematic diagram of the connection between the output shaft and the rotating shaft of the present invention;

[0033] Fig.14 It is a schematic diagram of the pipe structure of the present invention;

[0034] Fig.15 It is a schematic diagram of the coordination of the positioning plate of the present invention;

[0035] Fig.16 It is a schematic diagram of the connection block structure of the present invention.

[0036] In the figure: 1, column; 2, slide; 3, track; 4, support platform; 401, welding groove; 5, pipe fitting; 6, base; 601, ball bearing; 7, pressure block; 8, fixed shaft; 801, convex strip; 802, cross groove; 9, rotating shaft; 901, limiting groove; 902, guide surface; 10, connecting block; 1001, positioning groove; 11, pressure rod; 12, arc strip; 1201, boss; 13, convex block; 14, clamping block; 15, slider; 16, electromagnet; 17, positioning plate; 18, clamping strip; 1801, inclined surface; 19, fixed rod; 20, cross plate; 21, pull rope; 22, limiting block; 23, traction rope; 24, output shaft; 25, telescopic rod; 26, guide block; 27, arc groove; 28, notch; 29, positioning block; 30, clamping slot. DETAILED DESCRIPTION

[0037] like Figure 1-Figure 5 As shown, a duct welding device and a welding method include a base 6 and a column 1 fixedly arranged at one end of the top of the base 6, a support platform 4 is slidably arranged on one side of the column 1, a welding groove 401 is arranged at the center of the support platform 4, and the welding groove 401 is arranged along the length direction of the support platform 4. This structure is conducive to welding the pipe 5 below the support platform 4;

[0038] A fixed shaft 8 is provided below the support platform 4, and a plurality of pressing blocks 7 are evenly arranged at the welding groove 401 on the support platform 4. A cylinder matching with the pressing block 7 is installed at the support platform 4, so that the pressing block 7 is driven by the cylinder to operate. When the pipe fitting 5 is sleeved on the outside of the fixed shaft 8, the interface on the pipe fitting 5 is aligned with the welding groove 401 on the support platform 4 in the vertical direction. At this time, the pipe fitting 5 is between the pressing block 7 and the fixed shaft 8. When the position of the pipe fitting 5 is determined, the pressing block 7 is driven by the cylinder to approach the pipe fitting 5 and press the pipe fitting 5 onto the fixed shaft 8. At this time, the interface on the pipe fitting 5 can be welded by an external welding gun. Specifically, on one side of the support platform 4, A track 3 is fixedly installed, and a main machine for welding is slidably arranged on the track 3. The above-mentioned welding gun is connected to the main machine. In actual use, carbon dioxide can be used as a shielding gas for welding (that is, the interface on the pipe 5 is welded by a two-shield welding method). In order to drive the main machine to move on the track 3, a hydraulic rod can be connected to the main machine or a screw rod can be used to match the sliding seat (the screw rod passes through the sliding seat and cooperates with its thread) to drive the main machine to move. Of course, these are mature technical means in the field of machinery and will not be elaborated here. The above-mentioned structures are all commonly used components in straight seam welding machines, and the rest of the welding machine will not be described in detail here.

[0039] like Figure 2-Figure 12 , Fig.15 As shown, two arc strips 12 are sleeved on the outer peripheral surface of the fixed shaft 8, and the two arc strips 12 are symmetrically arranged about the fixed shaft 8. A slider 15 that slides with the fixed shaft 8 is integrally formed on the inner side of the arc strip 12, and a rotating shaft 9 is rotatably installed on the fixed shaft 8. Specifically, the rotating shaft 9 passes through a preset through hole on the slider 15. Figure 5 , Fig.11 As shown, a spiral limit groove 901 is provided on the outer circumferential surface of the rotating shaft 9, and a limit block 22 that slides with the limit groove 901 is elastically installed on the inner wall of the through hole. Through this structure, when the rotating shaft 9 rotates, it can drive the arc strip 12 to move along the axial direction of the fixed shaft 8.

[0040] A clamping assembly is installed on the outer side surface of the arc-shaped bar 12. In actual use, the pipe fitting 5 is sleeved on the outer side of the fixed shaft 8, and then the pipe fitting 5 is pushed forward so that the end of the pipe fitting 5 can be inserted into the clamping assembly. The end of the pipe fitting 5 can be clamped by the clamping assembly, so that the pipe fitting 5 can be driven to move through the arc-shaped bar 12, which is conducive to the movement of the pipe fitting 5 along the fixed shaft 8.

[0041] A boss 1201 is integrally formed at the bottom end of the arc strip 12, and a positioning assembly connected to the limit block 22 is provided at the boss 1201. In actual use, when one of the bosses 1201 moves toward the direction of the column 1 and is offset from the other boss 1201, the positioning assembly on the boss 1201 close to the column 1 will pop out and prompt the limit block 22 to move out of the limit groove 901. Thereafter, when the shaft 9 rotates, the cooperation between the upper limit groove 901 of the shaft 9 and the limit block 22 can drive the other arc strip 12 to move and realign the two arc strips 12. When the two end portions of the pipe fitting 5 are misaligned, this structure can correct the shape of the pipe fitting 5 so that the two ends of the pipe fitting 5 can be aligned.

[0042] The boss 1201 is configured as an L-shaped body, and the positioning assembly includes an L-shaped positioning plate 17, which is located in the depression of the boss 1201 and on one side of the boss 1201 parallel to the column 1. Fig.15 As shown, the positioning plate 17 and the boss 1201 are elastically matched;

[0043] Furthermore, a first groove slidably matched with the positioning plate 17 is provided on the boss 1201, and arc grooves 27 are provided on the front and rear side walls of the inner cavity of the first groove. Vertical straight grooves are connected at both ends of the arc groove 27, and a guide block 26 slidably matched with the arc groove 27 and the straight groove is fixedly provided on the positioning plate 17. A traction rope 23 is fixedly provided between the above-mentioned limit block 22 and the positioning plate 17. The traction rope 23 passes through the slider 15 and the arc bar 12 and slidably matches therewith. In the initial state, the two arc bars 12 are aligned with each other, and the two positioning plates 17 will also be in an aligned state. When the two arc bars 12 are staggered, one of the positioning plates 17 can pop out. During this process, the positioning plate 17 will pull one end of the limit block 22 out of the limit groove 901 through the traction rope 23.

[0044] A notch 28 is provided on the inner end surface of the first groove, and a positioning block 29 matching the notch 28 is elastically installed at the end of the positioning plate 17 away from the column 1. Both sides of the end of the positioning block 29 away from the positioning plate 17 are arranged as inclined extrusion surfaces. Through this structure, when the positioning block 29 pops out and is inserted into the notch 28, the positioning block 29 can only be moved out of the notch 28 when the pressure between the extrusion surface and the side edge of the notch 28 is large enough.

[0045] Reference Figure 9-12As shown, a fixing rod 19 is fixedly provided on one side surface of the positioning plate 17 close to the column 1, and clamping strips 18 are elastically installed on both sides of the fixing rod 19. The side of the clamping strip 18 away from the fixing rod 19 is an inclined surface 1801, and a clamping groove 30 is provided on the side surface of the positioning plate 17 away from the fixing rod 19. The cross-section of the clamping groove 30 is set to be T-shaped. The clamping strip 18 can be inserted into the clamping groove 30 through the set inclined surface 1801.

[0046] In actual use, the pipe fitting 5 to be welded is sleeved on the outside of the fixed shaft 8, referring to Figure 4 As shown, the pipe fitting 5 is pushed toward the direction of the column 1 so that the end of the pipe fitting 5 can be inserted into the clamping assembly, and the end of the pipe fitting 5 is clamped by the clamping assembly. When the limit block 22 on the slider 15 moves to the limit groove 901, the limit block 22 can pop out and insert into the limit groove 901. At this time, the arc strip 12 will stop moving, and the end of the pipe fitting 5 is clamped by the clamping assembly. Then, the two rotating shafts 9 are driven to rotate synchronously by the external driving assembly. The cooperation of the limit block 22 and the limit groove 901 can drive the slider 15 and the arc strip 12 to move toward the direction close to the column 1, so as to facilitate driving the pipe fitting 5 to the outside of the fixed shaft 8 and to be in the corresponding welding position. When the pipe fitting 5 is in place, the staff can adjust the position of the pipe fitting 5 so that the interface on the pipe fitting 5 and the welding groove 401 on the support platform 4 are aligned with each other in the vertical direction, so as to facilitate the external welding gun to weld the interface of the pipe fitting 5 through the welding groove 401;

[0047] Reference Fig.14 As shown, when the diameter of the pipe 5 is large and the length is short, the possibility of the ends of the pipe 5 being misaligned is greater. Fig.14 When the pipe fitting 5 is sleeved on the outside of the fixed shaft 8 and pushed toward the column 1, the protruding end of the pipe fitting 5 will first contact one of the clamping components and drive the arc strip 12 to move outside the fixed shaft 8, thereby causing the two arc strips 12 to stagger. Fig.15 As shown, when the two arc strips 12 are staggered, the two positioning plates 17 located at the boss 1201 will also be staggered. Fig.15The following is an example of the upper positioning plate 17 moving to the right and causing the two positioning plates 17 to be offset: when the upper positioning plate 17 moves to the right and is offset from the lower positioning plate 17, the upper positioning plate 17 can pop up downward, and the upper boss 1201 limits the lower positioning plate 17, so that the lower positioning plate 17 can be prevented from bouncing upward. In the process of the upper positioning plate 17 popping up downward, the guide block 26 can slide along the arc groove 27, so that the upper positioning plate 17 can move relative to the boss 1201 toward the direction close to the column 1. Through this structure, when the lower positioning plate 17 moves to one side of the upper positioning plate 17, , the two arc-shaped bars 12 can be aligned again, and as the upper positioning plate 17 pops up downward, the positioning plate 17 can pull the limiting block 22 through the traction rope 23, so that one end of the limiting block 22 moves out of the limiting groove 901. At the same time, the upper positioning plate 17 can be limited by the cooperation of the positioning block 29 and the notch 28. Afterwards, when the two positioning plates 17 are close to each other, the card strip 18 on the lower positioning plate 17 will be inserted into the card slot 30 of the upper positioning plate 17, so that the two positioning plates 17 can move synchronously in the horizontal direction, thereby driving the arc-shaped bar 12 to move synchronously in the horizontal direction; according to the above analysis, it can be known that when Fig.14 When the pipe fitting 5 of the shape shown is sleeved on the outside of the fixed shaft 8, the two ends of the pipe fitting 5 will successively contact the clamping components on the two arc-shaped strips 12, thereby causing the two arc-shaped strips 12 and the positioning plates 17 at the two arc-shaped strips 12 to be in a staggered state. At this time, the limit block 22 on the slider 15 close to the column 1 is in a staggered state with the limit groove 901. Therefore, when the pipe fitting 5 pushes the slider 15 on the two arc-shaped strips 12 to move to the limit groove 901, the rotating shaft 9 will only cooperate with the limit block 22 on the slider 15 away from the column 1 during the rotation process, thereby driving the arc-shaped strip 12 away from the column 1 to move. Since there is only one arc The curved strip 12 can move relative to the fixed shaft 8, so the shape of the pipe fitting 5 can be corrected so that the ends of the pipe fitting 5 can be aligned. When the rotating shaft 9 drives one of the curved strips 12 to move and align with the other curved strip 12, the clamping strip 18 on one of the positioning plates 17 will be inserted into the clamping groove 30 on the other positioning plate 17, so that the two curved strips 12 can move synchronously in the horizontal direction, which is conducive to sleeve the pipe fitting 5 on the outside of the fixed shaft 8 and put it in the corresponding welding position; after the welding is completed, the welded pipe fitting 5 can be sent out by rotating the rotating shaft 9 in the opposite direction, which is conducive to removing the pipe fitting 5 from the fixed shaft 8.

[0048] In summary, through the positioning assembly provided in this device, when the pipe 5 with ends offset from each other is sleeved on the fixed shaft 8, the two arc-shaped strips 12 can be offset from each other, so that one of the arc-shaped strips 12 is disconnected from the rotating shaft 9, and the other rotating shaft 9 drives the other arc-shaped strip 12 to move, which can prompt the two arc-shaped strips 12 to be realigned, thereby correcting the shape of the pipe 5 so that the ends of the pipe 5 can be in an aligned state.

[0049] like Figure 4-Figure 7 , Fig.10 As shown, the clamping assembly includes a connecting block 10 disposed on the outside of the arc strip 12, and the connecting block 10 can be fixedly connected to the arc strip 12. Of course, in order to adjust the position of the connecting block 10, the connecting block 10 can be movably installed on the outside of the arc strip 12. Specifically, a transverse plate 20 is fixedly disposed on the side of the connecting block 10, and a guide rod is fixedly disposed on the outer side of the arc strip 12. The guide rod passes through the transverse plate 20 and slides with it, and a screw is disposed at the transverse plate 20, and the screw passes through the transverse plate 20 and is threadedly connected with it, and the bottom end of the screw is rotationally matched with the arc strip 12;

[0050] The connecting block 10 is provided with an installation groove on one side away from the column 1, and protrusions 13 are slidably provided on the upper and lower sides of the inner cavity of the installation groove. Specifically, positioning grooves 1001 are provided on the front and rear side surfaces inside the installation groove, and a protrusion that slides with the positioning groove 1001 is fixedly provided on the protrusion 13. A limit spring is fixedly provided between the inner end surface of the installation groove and the protrusion 13, and an electromagnet 16 is provided between the upper and lower protrusions 13. The electromagnet 16 is fixedly connected to the connecting block 10, and the above-mentioned protrusion 13 is made of iron. A pressure rod 11 is rotatably installed on the end of the protrusion 13 away from the connecting block 10. The pressure rod 11 is a cylindrical structure. In actual use, a rubber pad can be fixedly mounted on the outside of the pressure rod 11 to increase the friction between the pressure rod 11 and the pipe fitting 5. Of course, the pressure rod 11 can also be set to a prismatic shape.

[0051] In actual use, a switch can be installed on the base 6, and the switch is used to control the electromagnet 16. Of course, the electromagnet 16 can also be controlled by a signal connection. When one end of the pipe fitting 5 is inserted between the upper and lower pressure rods 11, the arc strip 12 can be pushed through the connecting block 10. When the slider 15 moves to the limit groove 901, the electromagnet 16 can be powered on, thereby clamping the end of the pipe fitting 5.

[0052] like Figure 1-Figure 3As shown, a slide seat 2 is provided at one end of the fixed shaft 8 close to the column 1. The fixed shaft 8 and the support platform 4 are fixedly connected to the slide seat 2. Of course, the slide seat 2 is slidably set on the column 1. In actual application, a lead screw can be rotatably installed at the column 1. The lead screw passes through the slide seat 2 and cooperates with its thread, so as to drive the slide seat 2 to move up and down. A ball 601 is installed on the base 6. In actual use, when the diameter of the pipe fitting 5 is large, the pipe fitting 5 can fall onto the ball 601, which is beneficial to adjust the position of the pipe fitting 5.

[0053] Reference Figure 3-Figure 4 As shown, the convex strip 801 can be fixedly installed at the arc top of the fixed shaft 8. When the pipe 5 is sleeved on the outside of the fixed shaft 8, the interface of the pipe 5 is located between the convex strip 801 and the pressing block 7, which is conducive to pressing the pipe 5.

[0054] A strip-shaped cross groove 802 is provided on the outer circumferential surface of the fixed shaft 8, and the slider 15 is also arranged in a cross shape as a whole, so that the slider 15 is slidably arranged in the cross groove 802, and the above-mentioned rotating shaft 9 is rotatably installed in the cross groove 802. In actual use, a rubber pad can be bonded to the surface of the slider 15 in contact with the cross groove 802, and the friction between the slider 15 and the fixed shaft 8 is increased by the deformation of the rubber pad. Through this structure, when the slider 15 is disconnected from the rotating shaft 9, the slider 15 and the arc strip 12 can remain stable.

[0055] Reference Figure 6 , Fig.10 As shown, the end of the limit groove 901 away from the column 1 is set as an inclined guide surface 902. Through this structure, it is convenient for the limit block 22 to move out of the limit groove 901. A circular hole is opened at the inner wall of the arc strip 12, and a clamping block 14 is slidably set in the circular hole, and a spring is fixedly set between the clamping block 14 and the inner end surface of the circular hole. A positioning hole matching with the clamping block 14 is opened on the outer circumferential surface of the fixed shaft 8. The end of the clamping block 14 away from the arc strip 12 is an arc-shaped structure. The positioning hole is located at the end of the fixed shaft 8 away from the column 1. When the rotating shaft 9 rotates in the opposite direction to drive the pipe fitting 5 to move outward so that the limit block 22 moves out of the limit groove 901, the staff can manually drive the arc strip 12 to move to the end of the fixed shaft 8 so that the clamping block 14 is stuck in the positioning hole, so as to maintain the stability of the arc strip 12.

[0056] Reference Fig.10 As shown, a pull rope 21 is provided at the boss 1201, one end of the pull rope 21 is fixedly connected to the positioning plate 17, and the other end of the pull rope 21 passes through the boss 1201 and is fixedly provided with a pull ring. The pull rope 21 and the boss 1201 are slidably matched, and this structure is conducive to manually resetting the positioning plate 17.

[0057] Reference Fig.11As shown, a second groove slidably matched with the limit block 22 is opened on the inner wall of the through hole, and a first spring is fixedly arranged between the inner end surface of the second groove and the limit block 22.

[0058] The fixing rod 19 is provided with a strip groove which is slidably matched with the clamping strip 18 , and a second spring is fixedly arranged between the inner end surface of the strip groove and the clamping strip 18 .

[0059] Reference Fig.13 As shown, a motor can be installed in the slide 2, and the output shaft 24 of the motor cooperates with the rotating shaft 9 passing through one end of the fixed shaft 8 through a belt drive, thereby driving the rotating shaft 9 to rotate forward and reverse.

[0060] Reference Fig.15 As shown, a telescopic rod 25 is fixedly arranged at the top end inside the first groove. Specifically, the telescopic rod 25 includes a sleeve fixedly connected to the boss 1201 and a sliding rod slidably matched with the sleeve. A third spring is fixedly arranged between the sliding rod and the sleeve. One end of the sliding rod is against the positioning plate 17. This structure facilitates the popping out of the positioning plate 17.

[0061] The positioning plate 17 is provided with a rectangular groove that slidably cooperates with the positioning block 29, and a fourth spring is fixedly arranged between the inner end surface of the rectangular groove and the positioning block 29. Through this structure, when one of the positioning plates 17 cooperates with the notch 28 through the positioning block 29, it can prevent the other positioning plate 17 from popping out.

[0062] Reference Fig.16 As shown, the connecting block 10 can also be set to a T shape, and the above-mentioned protrusion 13 is located in the area with a larger cross-section on the connecting block 10. Through this structure, the contact between the pipe fitting 5 and the connecting block 10 can be good while ensuring that the protrusion 13 has a larger size.

Claims

1. A duct welding device, comprising a base and a column fixedly arranged at one end of the top of the base, a support platform is slidably arranged on one side of the column, a welding groove is arranged at the center of the support platform, a fixed shaft for supporting the pipe fitting is arranged below the support platform, and a plurality of pressing blocks are evenly arranged at the welding groove on the support platform, characterized in that: Two arc-shaped strips are sleeved on the outer circumference of the fixed shaft, and the two arc-shaped strips are symmetrically arranged about the fixed shaft. A slider that slides with the fixed shaft is integrally formed on the inner side of the arc-shaped strip. Two rotating shafts are rotatably installed on the fixed shaft, and the rotating shafts pass through the preset through holes on the sliders. A spiral limiting groove is opened on the outer circumference of the rotating shaft, and a limiting block that slides with the limiting groove is elastically installed on the inner wall of the through hole; A boss is provided at the bottom end of the arc-shaped strip, and a positioning assembly connected to the limit block is provided on the boss. When one of the bosses moves toward the direction close to the column and staggers with the other boss, the positioning assembly on the boss will pop out and cause the limit block to disengage from the limit groove, so that the two arc-shaped strips can be realigned during the rotation of the shaft; A clamping assembly is installed on the outer side of the arc strip, and the clamping assembly includes a connecting block arranged on the outer side of the arc strip, a side of the connecting block away from the column is provided with a mounting groove, two protrusions are elastically installed in the mounting groove, an electromagnet is arranged between the upper and lower protrusions, the protrusion is made of iron, and a pressure rod is rotatably installed on the end of the protrusion away from the connecting block; The boss is configured as an L-shape as a whole, and the positioning assembly includes an L-shaped positioning plate, the positioning plate is located in the recess of the boss and is on a side surface parallel to the boss and the column, the positioning plate and the boss are elastically matched, a first groove is provided on the boss and is slidably matched with the positioning plate, arc grooves are provided on the front and rear side walls of the inner cavity of the first groove, and vertical straight grooves are connected at both ends of the arc groove, and a guide block that is slidably matched with the arc groove and the straight groove is fixedly provided on the positioning plate, a traction rope is fixedly provided between the limit block and the positioning plate, the traction rope passes through the slider and the arc strip and slidably matches therewith, a notch is provided on the inner end surface of the first groove, and a positioning block that matches the notch is elastically installed on one end of the positioning plate away from the column, and both sides of the end of the positioning block away from the positioning plate are arranged with inclined extrusion surfaces; A telescopic rod is fixedly arranged at the top of the first groove, the telescopic rod comprises a sleeve fixedly connected to the boss and a slide rod slidably matched with the sleeve, a third spring is fixedly arranged between the slide rod and the sleeve, and one end of the slide rod is against the positioning plate; A fixing rod is fixedly arranged on one side of the positioning plate close to the column, and clamping strips are elastically installed on both sides of the fixing rod. The side of the clamping strip away from the fixing rod is an inclined surface, and a clamping groove is opened on the side of the positioning plate away from the fixing rod, and the cross-section of the clamping groove is set to be T-shaped.

2. The duct welding device according to claim 1, characterized in that: The convex strip is fixedly installed at the arc top of the fixed shaft.

3. The duct welding device according to claim 1, characterized in that: A cross groove is provided on the outer peripheral surface of the fixed shaft, and the sliding block is slidably arranged in the cross groove.

4. The duct welding device according to claim 1, characterized in that: One end of the limiting groove away from the column is arranged as an inclined guide surface.

5. The duct welding device according to claim 1, characterized in that: Both ends of the arc-shaped groove are connected with vertical straight grooves.

6. The duct welding device according to claim 1, characterized in that: The pressure rod is a cylindrical structure, and a rubber pad is provided on the outer fixed sleeve of the pressure rod.

7. A method for welding using the duct welding device according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: sleeve the pipe fitting on the outside of the fixed shaft and push the pipe fitting to the welding position; adjust the position of the pipe fitting so that the interface on the pipe fitting is aligned with the welding groove on the support platform; and press the pipe fitting onto the fixed shaft by a pressing block for welding.

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