Ventilation pipeline welding supporting equipment

Abstract

The invention discloses ventilation pipeline welding supporting equipment, relates to the technical field of ventilation pipeline welding, and aims at solving the technical problem that a traditional supporting device is insufficient in functionality. A center driving assembly, at least two outer edge supporting assemblies and an end supporting assembly are sequentially arranged on the main body rail frame from the input end to the output end. Welding assemblies are arranged on the outer sides of the two outer edge supporting assemblies; the welding end of the welding assembly is arranged in the gap between the two outer edge supporting assemblies in a penetrating mode. The driving type pushing mechanism has an intermittent pushing state and a continuous pushing state, and the driving type pushing mechanism is matched with the center driving disc frame to conduct continuous rotating work or intermittent rotating work, so that the ventilation pipeline welding supporting equipment conducts welding work on a circular pipeline of a spiral curling preparation technology; the welding work of the circular pipeline of the circular pipeline unit segmented welding preparation process is conducted; through cooperation of the dual-mode driving mechanism and the reconfigurable supporting system, the limitation of the single function of traditional equipment is broken through.

Description

Technical Field

[0001] The present invention relates to the technical field of ventilation duct welding, and more particularly to a ventilation duct welding support device. Background Art

[0002] The present invention relates to the technical field of ventilation duct manufacturing, and in particular to a ventilation duct welding support device, which is particularly designed to systematically optimize the segmented welding operation of a plurality of circular duct units and the continuous welding process of spirally coiled metal plates.

[0003] 1. Circular pipe unit segment welding technology Technical Principle The process breaks down the ventilation duct into standard pipe sections with a length of 0.5-3m, which is achieved through the following steps: Single section manufacturing: rectangular metal plate → bending on a rolling machine; multi-section splicing: coaxial positioning of pipe sections → circumferential seam welding and longitudinal seam welding.

[0004] 2. Spiral coil continuous welding technology Technical Principle Using a whole coil of metal sheet as raw material, a seamless tube body is achieved through dynamic forming: Spiral forming: The strip cuts into the forming roller at an angle β (30°-50°), satisfying the relationship: D=π⋅sinβW (D=tube diameter, W=plate width) Continuous welding: spiral seam welding is performed simultaneously with forming; the pipe body rotates synchronously + axial feed; the pipe body moves in a progressive rotation manner so that the pipe body weld passes through the welding device for welding work; In the existing welding process, the ventilation duct is supported and fixed by arranging a clamp on the rotating device, and then the welding work is performed on the weld seam through welding installation. The existing rotating support device has a single structure and cannot effectively adapt to the ventilation duct unit segment welding technology and the ventilation duct spiral curling continuous welding technology application. The conventional treatment method has a single effect; therefore, how to propose a ventilation duct welding support device that assists in performing diversified functionalities is particularly important. Summary of the Invention

[0005] The object of the present invention is to provide a ventilation duct welding support device to solve the technical problem of insufficient functionality of traditional support devices.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a ventilation duct welding support device, comprising a main rail frame; a central drive assembly, at least two outer support assemblies, and an end support assembly are sequentially arranged on the main rail frame from the input end to the output end; wherein, a welding assembly is arranged on the outside of the two outer support assemblies; wherein, the welding end of the welding assembly is passed through the gap between the two outer support assemblies; the central drive assembly comprises a central drive disc frame; the central drive disc frame is arranged at a position relatively close to the input end of the main rail frame; a drive-type pushing mechanism is arranged inside the central drive disc frame; wherein, the drive-type pushing mechanism has an intermittent pushing state and a continuous pushing state; wherein, the two output ends of the drive-type pushing mechanism are respectively provided with inner wall support mechanisms.

[0007] The driving pushing mechanism in the present invention has an intermittent pushing state and a continuous pushing state, and cooperates with the central driving disc frame to perform continuous rotation or intermittent rotation, so that the ventilation duct welding support equipment can form the welding work of the circular pipe of the spiral curling preparation process, and the welding work of the circular pipe of the circular pipe unit segment welding preparation process; through the coordination of the dual-mode driving mechanism and the reconfigurable support system, the single function limitation of the traditional equipment is broken through.

[0008] Preferably, the outer edge support assembly and the end support assembly are both composed of a centering and holding assembly; and the centering and holding assembly includes two fixed rotating seats arranged on the main rail frame; the gap between the two fixed rotating seats constitutes an operating chamber; fixed connecting frames are respectively provided on both sides of the axis of the operating chamber; the two fixed connecting frames are connected by a number of fixed rotating shafts arranged at equal intervals in an annular manner, and a number of driving clamping arms are linearly and evenly spaced on the fixed rotating shaft; wherein, a group of linearly arranged driving clamping arms are provided at the ends thereof; the extensions are all hingedly connected to the push rod through the connecting shaft A; and the fixed end of the push rod is hingedly connected to the fixed rotating seat through the connecting shaft B; wherein, the outer extension ends of the two driving clamping arms are both provided with linkage arms through two linkage shafts; wherein, the fixed rotating shaft and the axis centers of the two linkage shafts are distributed in an equilateral triangle.

[0009] Preferably, during the return stroke of the push rod, one group of the driving clamping arms rotates with the fixed rotating shaft as the center, and the linkage arm is hingedly connected to cause several groups of the driving clamping arms to expand or contract equidistantly, forming an external clamping cavity for clamping and limiting the outer circumferential surface of the ventilation duct; wherein the external clamping cavity relatively close to the side of the central driving disc frame is composed of a truncated cone-shaped introduction cavity and a cylindrical positioning cavity.

[0010] Preferably, the central drive disc frame includes an annular rotating guide rail arranged at the end of the main rail frame; a central connecting arm is movably provided inside the annular rotating guide rail through a slider; a movable piston cavity is axially provided on the inner wall of the central connecting arm; and a rotating drive cavity is radially provided on the inner wall of the central connecting arm; wherein, connecting grooves are provided on the surface of the central connecting arm relative to both sides of the rotating drive cavity.

[0011] Preferably, the drive-type pushing mechanism includes two cranks that are centrally symmetrically distributed; a movable driving arm is hingedly provided on the crank; wherein the two cranks are detachably connected; and a driving motor is provided on any one of the cranks.

[0012] Preferably, the two cranks are connected by a detachable movable mechanism, and the detachable movable mechanism includes a connecting block A fixed on one of the cranks; the surface of the connecting block A is provided with threaded teeth; and keyways are provided on both sides of the circumferential surface of the connecting block A; the connecting block A is threadedly connected to a fastening ring block relative to the threaded teeth; an adjusting ring block is rotatably provided inside the fastening ring block; a limit pin block is provided on the inner wall of the adjusting ring block and is plugged into the keyway; wherein, a connecting block B is provided on the side of the other crank relatively close to the connecting block A; and an adjustment adapter groove is provided on the surface of the connecting block B.

[0013] Preferably, the inner wall support mechanism includes a piston slider rotatably arranged at the end of the movable driving arm; a fixed driving connecting shaft is provided on the piston slider; the fixed driving connecting shaft is passed through the connecting groove; wherein, an annular connecting frame fixedly connected to the fixed driving connecting shaft is provided on the outer side of the piston slider; wherein, guide rail shafts are distributed in an arc shape on the annular connecting frame; the annular connecting frame is provided with support arms via hinge seats at both ends of the guide rail shaft; an adaptive slider is slidably provided on the guide rail shaft; the adaptive slider is hingedly provided with a force-bearing arm hingedly connected to the support arm; wherein, the adaptive slider is elastically connected to the annular connecting frame through a spring; and the support arm is rotatably provided with a friction wheel.

[0014] Preferably, the support arm and the friction wheel are connected by a ratchet; and the friction wheel is in a ratchet release state along the direction from the end support assembly to the central drive assembly, and the friction wheel is in a ratchet engagement state along the direction from the central drive assembly to the end support assembly.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The drive mechanism of the present invention has both intermittent and continuous driving modes, and cooperates with the central drive disc frame to perform continuous or intermittent rotation, so that the ventilation duct welding support equipment can weld circular ducts prepared by spiral curling processes, as well as circular ducts prepared by circular duct unit segment welding processes. Through the synergy of the dual-mode drive mechanism and the reconfigurable support system, the single-function limitation of traditional equipment is overcome. 2. The present invention drives the driving clamping arm to rotate by the push rod's return stroke, and cooperates with the arrangement of multiple sets of linkage arms, so that the multiple driving clamping arms can perform synchronous expansion or contraction to form a limit operation on the outer edge of the segmented circular pipe unit or the spirally coiled pipe; and cooperates with the frustum-shaped introduction cavity and the cylindrical positioning cavity to form an outer clamping cavity, forming a guiding transition effect during the supporting and conveying process, so as to facilitate the smooth placement of the segmented circular pipe unit or the spirally coiled pipe in the outer clamping cavity; 3. The present invention drives the sliding blocks distributed in an annular shape by setting an annular rotating guide rail, causing the central connecting arm to rotate continuously or intermittently, thereby performing radial welding of the spiral gap of the spirally curled pipe seam and welding of the circumferential surface of the annular outer edge of the segmented circular pipe unit; 4. The two cranks of the present invention are arranged in a centrally symmetrical distribution, so that the driving motor drives the two cranks to move relatively close to or relatively far away from each other. This arrangement is used to continuously transport the spirally coiled pipe in the axial direction, optimizes the traditional propulsion device, such as the cylinder stroke that needs to return and reset after pushing, and then produces intermittent pushing, effectively improves the continuity of spirally coiled pipe welding, and improves the efficiency of preparation and production; and by rotating the fastening ring block, the adjustment ring block is lifted to separate the limit pin block from the adjustment adapter groove, so that the installation connection of the two cranks is released, and one of the cranks is manually rotated and adjusted, so that the two cranks are symmetrically distributed in the upper and lower parts, and the two cranks are installed and connected again, so that the two oppositely distributed movable driving arms perform axial positional pushing or contracting movements. This arrangement forms a conventional intermittent pushing situation, which is used for switching transition operations of the longitudinal welds and the radial welds of the circumferential surface of the segmented circular pipe units; 5. In the present invention, a piston structure is formed by setting a central connecting arm and a movable piston chamber, cooperating with a piston slider and a crank hinged setting, and connecting and fixing the annular connecting frame through a fixed driving connecting shaft; and through the setting of a spring, the adaptive slider slides and pushes the support arm to expand through the force-bearing arm to fit with the inner wall of the ventilation duct to form a supporting effect; so that the inner wall support mechanism acts as the power output end of the driving pushing mechanism to push the work to form a conveying effect on the ventilation duct; 6. The surface of the friction wheel in the present invention is made of rubber material, which can produce a good friction effect. During the movement of the friction wheel along the direction from the central drive assembly to the end support assembly, the friction wheel and the ratchet structure at the end of the support arm are engaged based on the limitation of the one-way rotation of the ratchet, so that the friction wheel cannot roll. The friction wheel with a rubber surface is used to push the segmented circular pipe unit or the spirally coiled pipe. At the same time, based on the reset movement of the friction wheel, that is, along the direction from the end support assembly to the central drive assembly, the friction wheel can rotate. The rotation causes the friction wheel to roll on the inner wall of the segmented circular pipe unit or the spirally coiled pipe, thereby avoiding the reset movement causing the segmented circular pipe unit or the spirally coiled pipe to follow the movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the outer edge support assembly of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the central drive rack of the present invention; Figure 4 This is a schematic diagram of the installation structure of the central drive rack, the drive-type pushing mechanism, and the inner wall support mechanism of the present invention; Figure 5 This is a schematic diagram of the three-dimensional structure of the central connecting arm, the rotary drive chamber, and the movable piston chamber of the present invention; Figure 6 This is a schematic diagram of the installation structure of the drive-type pushing mechanism of the present invention; Figure 7 This is a schematic diagram of the split three-dimensional structure of the driving pushing mechanism of the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of the inner wall support mechanism of the present invention.

[0017] Description of the numbers in the figure: 1. Main rail frame; 2. Center drive assembly; 3. Outer support assembly; 4. End support assembly; 5. Welding assembly; 6. Center drive disc frame; 7. Driven push mechanism; 8. Inner wall support mechanism; 301, fixed rotating seat; 302, fixed connecting frame; 303, fixed rotating shaft; 304, driving clamping arm; 305, push rod; 306, linkage arm; 601, annular rotating guide rail; 602, central connecting arm; 6021, connecting groove; 701, crank; 702, movable drive arm; 703, connecting block A; 7031, threaded teeth; 7032, keyway; 704, connecting block B; 7041, adjustment adapter groove; 705, fastening ring block; 706, adjustment ring block; 707, limit pin block; 709, drive motor; 801. Piston slider; 802. Fixed drive connecting shaft; 803. Annular connecting frame; 804. Guide shaft; 805. Adaptive slider; 806. Force arm; 808. Friction wheel; 809. Support arm. DETAILED DESCRIPTION

[0018] like Figures 1 to 8 As shown, the present invention relates to a ventilation duct welding support device, comprising a main rail frame 1; a central drive assembly 2, at least two outer support assemblies 3, and an end support assembly 4 are sequentially arranged on the main rail frame 1 from the input end to the output end; wherein, a welding assembly 5 is arranged on the outside of the two outer support assemblies 3; wherein, the welding end of the welding assembly 5 is passed through the gap between the two outer support assemblies 3; the central drive assembly 2 includes a central drive disc frame 6; the central drive disc frame 6 is arranged at a position relatively close to the input end of the main rail frame 1; a drive-type pushing mechanism 7 is arranged inside the central drive disc frame 6; wherein, the drive-type pushing mechanism 7 has an intermittent pushing state and a continuous pushing state; wherein, the two output ends of the drive-type pushing mechanism 7 are respectively provided with inner wall support mechanisms 8. The driving pushing mechanism 7 in the present invention has an intermittent pushing state and a continuous pushing state, and cooperates with the central driving disc frame 6 to perform continuous rotation or intermittent rotation, so that the ventilation duct welding support equipment can form the welding work of the circular pipe of the spiral curling preparation process, and the welding work of the circular pipe of the circular pipe unit segment welding preparation process; through the coordination of the dual-mode driving mechanism and the reconfigurable support system, the single function limitation of the traditional equipment is broken through.

[0019] In an embodiment of the present invention, the outer edge support assembly 3 and the end support assembly 4 are both composed of a centering and holding assembly; and the centering and holding assembly includes two fixed rotating seats 301 arranged on the main rail frame 1; the gap between the two fixed rotating seats 301 constitutes an operating chamber; fixed connecting frames 302 are respectively provided on both sides of the axis of the operating chamber; the two fixed connecting frames 302 are connected by a number of fixed rotating shafts 303 arranged at equal intervals in an annular manner, and a number of driving clamping arms 304 are linearly and evenly spaced on the fixed rotating shaft 303; wherein, a group of linearly arranged driving clamping arms 304 are provided with extensions at the ends; the extensions are all hingedly connected to the push rod 305 through the connecting shaft A; and the fixed end of the push rod 305 is hingedly connected to the fixed rotating seat 301 through the connecting shaft B; wherein, the outer extension ends of the two driving clamping arms 304 are both provided with linkage arms 306 through two linkage shafts; wherein, the fixed rotating shaft 303 and the axis centers of the two linkage shafts are distributed in an equilateral triangle.

[0020] In an embodiment of the present invention, during the return stroke of the push rod 305, one of the drive clamping arms 304 rotates about the fixed rotation axis 303, and the linkage arm 306 is articulated to cause the multiple drive clamping arms 304 to expand or contract equidistantly, forming an outer clamping cavity for clamping and limiting the outer circumference of the ventilation duct. The outer clamping cavity on the side relatively close to the central drive disc frame 6 is composed of a truncated cone-shaped introduction cavity and a cylindrical positioning cavity. The present invention drives the drive clamping arms 304 to rotate during the return stroke of the push rod 305, and in conjunction with the multiple linkage arms 306, causes the multiple drive clamping arms 304 to simultaneously expand or contract, forming a position limiting operation on the outer edge of the segmented circular pipe unit or spirally coiled pipe. The outer clamping cavity is formed by the truncated cone-shaped introduction cavity and the cylindrical positioning cavity, forming a guiding transition effect during the support and conveying process, facilitating the smooth placement of the segmented circular pipe unit or spirally coiled pipe within the outer clamping cavity.

[0021] In an embodiment of the present invention, the central drive disc frame 6 includes an annular rotating guide rail 601 disposed at the end of the main rail frame 1; a central connecting arm 602 is movably disposed within the annular rotating guide rail 601 via a slider; a movable piston cavity is axially disposed on the inner wall of the central connecting arm 602; and a rotation drive cavity is radially disposed on the inner wall of the central connecting arm 602; wherein, connecting grooves 6021 are disposed on the surface of the central connecting arm 602 on both sides of the rotation drive cavity. The present invention uses the annular rotating guide rail 601 to drive the sliding of several annularly distributed sliders, causing the central connecting arm 602 to rotate continuously or intermittently, thereby performing radial welding of the spiral gap of the spirally coiled pipe seam and welding of the circumferential surface of the annular outer edge of the segmented circular pipe unit.

[0022] In an embodiment of the present invention, the driven pushing mechanism 7 includes two cranks 701 that are symmetrically distributed along the center; a movable driving arm 702 is hingedly provided on the crank 701; wherein the two cranks 701 are detachably connected; and a driving motor 709 is provided on any one of the cranks 701.

[0023] In an embodiment of the present invention, two cranks 701 are connected by a detachable movable mechanism, and the detachable movable mechanism includes a connecting block A703 fixed on one of the cranks 701; the surface of the connecting block A703 is provided with threaded teeth 7031; and keyways 7032 are provided on both sides of the circumferential surface of the connecting block A703; the connecting block A703 is threadedly connected with a fastening ring block 705 at a position relative to the threaded teeth 7031; an adjusting ring block 706 is provided for rotation inside the fastening ring block 705; a limiting pin block 707 that is plugged into the keyway 7032 is provided on the inner wall of the adjusting ring block 706; wherein, a connecting block B704 is provided on the side of the other crank 701 relatively close to the connecting block A703; and an adjusting adaption groove 7041 is provided on the surface of the connecting block B704. In the present invention, by Figure 6 The two cranks 701 are arranged in a centrally symmetrical distribution, so that the drive motor 709 drives the two cranks 701 to move relatively close to or relatively far away from each other. This arrangement is used to continuously transport the spirally coiled pipe axially, optimize the traditional propulsion device such as the cylinder stroke that needs to return and reset after pushing, and then produce intermittent pushing, effectively improve the continuity of the spirally coiled pipe welding, and improve the efficiency of production; and through Figure 7 The rotating fastening ring block 705 shown causes the adjusting ring block 706 to lift and separate the limit pin block 707 from the adjusting adapter groove 7041, so that the installation connection of the two cranks 701 is released, and one of the cranks 701 is manually rotated and adjusted, so that the two cranks 701 are distributed symmetrically in the upper and lower parts, and the two cranks 701 are installed and connected again, so that the two oppositely distributed movable driving arms 702 perform the same-position advancement or contraction movement in the axial position. Through this setting, a conventional intermittent pushing situation is formed, which is used for the switching transition operation of the longitudinal welds and the radial welds of the circumferential surface of the segmented circular pipe unit.

[0024] In an embodiment of the present invention, the inner wall support mechanism 8 includes a piston slider 801 rotatably arranged at the end of the movable driving arm 702; a fixed driving connecting shaft 802 is provided on the piston slider 801; the fixed driving connecting shaft 802 is passed through the connecting groove 6021; wherein, an annular connecting frame 803 fixedly connected to the fixed driving connecting shaft 802 is provided on the outer side of the piston slider 801; wherein, guide rail shafts 804 are distributed in an arc shape on the annular connecting frame 803; support arms 809 are provided at both ends of the annular connecting frame 803 relative to the guide rail shaft 804 through hinge seats; an adaptive slider 805 is slidably provided on the guide rail shaft 804; the adaptive slider 805 is hingedly provided with a force-bearing arm 806 hingedly connected to the support arm 809; wherein, the adaptive slider 805 is elastically connected to the annular connecting frame 803 through a spring; and, the support arm 809 is rotatably provided with a friction wheel 808. In the present invention, a piston structure is formed by setting a central connecting arm 602 and a movable piston chamber, cooperating with a piston slider 801 and a crank 701 to be hinged, and the annular connecting frame 803 is connected and fixed by a fixed driving connecting shaft 802; and through the setting of a spring, the adaptive slider 805 slides and pushes the support arm 809 to expand through the force-bearing arm 806 to fit with the inner wall of the ventilation duct to form a supporting effect; so that the inner wall support mechanism 8 acts as the power output end of the driving pushing mechanism 7 to push the work to form a conveying effect on the ventilation duct.

[0025] In an embodiment of the present invention, the support arm 809 and the friction wheel 808 are connected by a ratchet; and the friction wheel 808 is in a ratchet release state along the direction from the end support component 4 to the central drive component 2, and the friction wheel 808 is in a ratchet engagement state along the direction from the central drive component 2 to the end support component 4. In the present invention, the surface of the friction wheel 808 is made of rubber material, which can produce a good friction effect. During the movement of the friction wheel 808 along the direction from the central drive component 2 to the end support component 4, the friction wheel 808 is engaged with the ratchet structure at the end of the support arm 809 based on the limitation of the one-way rotation of the ratchet, so that the friction wheel 808 cannot roll. The friction wheel 808 with a rubber surface is used to advance the segmented circular pipe unit or the spirally coiled pipe. At the same time, based on the reset movement of the friction wheel 808, that is, along the direction from the end support component 4 to the central drive component 2, the friction wheel 808 can rotate, and the rotation causes the friction wheel 808 to roll on the inner wall of the segmented circular pipe unit or the spirally coiled pipe, thereby avoiding the reset movement causing the segmented circular pipe unit or the spirally coiled pipe to follow the movement.

[0026] Working principle: This embodiment provides a ventilation duct welding support device, using the following steps: S100, pre-treatment: cutting the metal sheet and performing unitized curling, and spiral curling the long sheet through a three-axis device; and lubricating the end of the driving clamping arm 304; S200, outer circumferential surface adjustment process: The push rod 305 is used to drive the driving clamping arm 304 to rotate by the return stroke, and the multiple sets of linkage arms 306 are provided, so that the multiple driving clamping arms 304 are synchronously expanded or retracted, forming a position limit on the outer edge of the ventilation duct of the required diameter size; S300: Function adjustment processing: S301: If the circular pipe welding adjustment process of the spiral curling preparation process is performed: By manually rotating the fastening ring block 705, the adjusting ring block 706 is lifted, and the limiting pin block 707 is separated from the adjusting adapting groove 7041, so that the installation connection between the two cranks 701 is released. Then, one of the cranks 701 is manually rotated and adjusted, so that the two cranks 701 are distributed symmetrically around the center; then, the fastening ring block 705 is pressed down and rotated to rigidly connect the two cranks 701; S302: If circular pipe welding adjustment processing is performed in a circular pipe unit segment welding process: By manually rotating the fastening ring block 705, the adjusting ring block 706 is lifted, and the limiting pin block 707 is separated from the adjusting adapter groove 7041, so that the installation connection between the two cranks 701 is released. In conjunction with manual rotation and adjustment of one of the cranks 701, the two cranks 701 are symmetrically distributed up and down; then, the fastening ring block 705 is pressed down and rotated to rigidly connect the two cranks 701; S400, material loading: Material is loaded and delivered into the outer clamping cavity between the central drive assembly 2 and the outer support assembly 3 relatively close to the central drive assembly 2 by manual or mechanical coordination. The clamping arm 304 is driven to radially support and limit the outer wall of the circular ventilation duct. The spring is set to cause the adaptive slider 805 to slide and push the support arm 809 through the force-bearing arm 806 to expand and fit the inner wall of the ventilation duct to form a supporting effect. S500, supporting conveying welding process: S501. When performing welding of circular pipes using a spiral curling process: Adjust the height and left-right orientation of the welding assembly 5; then, the two cranks 701 are driven to rotate by the drive motor 709, and the two inner wall support mechanisms 8 are moved relatively close to each other and relatively away from each other under the limit of the central connecting arm 602. Under the setting of the ratchet, the circular pipe prepared by spiral curling is caused to move unidirectionally. At the same time, the annular rotating guide rail 601 is used to drive the sliding of the several sliders distributed in an annular shape, causing the central connecting arm 602 to rotate continuously, and the spiral weld passing through is welded by the welding assembly 5; S502. If circular pipe welding processing of the circular pipe unit segment welding preparation process is carried out: adjust the height and left and right orientation of the welding assembly 5; then drive the two cranks 701 to rotate through the driving motor 709, and make the two inner wall support mechanisms 8 perform synchronous coaxial pushing movement and reset work and synchronous coaxial retraction movement under the limit of the center connecting arm 602. During the pushing process, the radial circumferential surface of the circular pipe unit is welded, and the annular rotating guide rail 601 is set to drive the sliding of several sliders distributed in an annular shape, so that the center connecting arm 602 rotates intermittently, and during the rotation process, the longitudinal gap of the circular pipe unit is welded.

[0027] The embodiments disclosed in the present invention are preferred embodiments, but are not limited to them. Ordinary technicians in this field can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. As long as they do not deviate from the spirit of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A ventilation duct welding support device, characterized in that: It comprises a main rail frame (1); a central drive assembly (2), at least two outer edge support assemblies (3), and an end support assembly (4) are sequentially arranged on the main rail frame (1) from the input end to the output end; Wherein, a welding assembly (5) is provided outside the two outer edge support assemblies (3); wherein, a welding end of the welding assembly (5) is passed through the gap between the two outer edge support assemblies (3); The central drive assembly (2) includes a central drive rack (6); the central drive rack (6) is arranged relatively close to the input end of the main rail frame (1); a driving push mechanism (7) is provided inside the central drive rack (6); wherein the driving push mechanism (7) has an intermittent pushing state and a continuous pushing state; Wherein, the two output ends of the driving pushing mechanism (7) are respectively provided with inner wall supporting mechanisms (8).

2. A ventilation duct welding support device according to claim 1, characterized in that: The outer edge support assembly (3) and the end support assembly (4) are both formed by a centering support assembly; and the centering support assembly includes two fixed rotating seats (301) arranged on the main rail frame (1); the gap between the two fixed rotating seats (301) constitutes an operating cavity; fixed connecting frames (302) are respectively provided on both axial sides of the operating cavity; the two fixed connecting frames (302) are connected by a plurality of fixed rotating shafts (303) arranged at equal intervals in an annular manner, Furthermore, a plurality of driving clamping arms (304) are linearly and evenly spaced on the fixed rotating shaft (303); wherein a group of linearly arranged driving clamping arms (304) are provided with extensions at their ends; the extensions are hingedly connected to the push rods (305) via a connecting shaft A; and the fixed ends of the push rods (305) are hingedly connected to the fixed rotating seat (301) via a connecting shaft B; Wherein, the outer extension ends of the two driving clamping arms (304) are both provided with linkage arms (306) via two linkage shafts; The fixed rotating shaft (303) and the axes of the two linkage shafts are distributed in an equilateral triangle.

3. A ventilation duct welding support device according to claim 2, characterized in that: During the return stroke of the push rod (305), one group of the driving clamping arms (304) rotates with the fixed rotation axis (303) as the center, and the linkage arm (306) is articulated to cause several groups of the driving clamping arms (304) to be equidistantly expanded or equidistantly contracted, thereby forming an outer clamping cavity for clamping and limiting the outer circumferential surface of the ventilation duct; The outer clamping cavity on the side relatively close to the central driving disc frame (6) is composed of a truncated cone-shaped introduction cavity and a cylindrical positioning cavity.

4. A ventilation duct welding support device according to claim 3, characterized in that: The central drive disc frame (6) comprises an annular rotating guide rail (601) arranged at the end of the main rail frame (1); a central connecting arm (602) is movably provided inside the annular rotating guide rail (601) via a slider; a movable piston cavity is axially provided on the inner wall of the central connecting arm (602); and a rotation drive cavity is radially provided on the inner wall of the central connecting arm (602); Wherein, connection grooves (6021) are provided on the surface of the central connection arm (602) on both sides relative to the rotation drive cavity.

5. The ventilation duct welding support device according to claim 4, characterized in that: The drive-type pushing mechanism (7) comprises two cranks (701) distributed symmetrically around the center; a movable driving arm (702) is hingedly provided on the crank (701); The two cranks (701) are detachably connected to each other; and a driving motor (709) is provided on any one of the cranks (701).

6. The ventilation duct welding support device according to claim 5, characterized in that: The two cranks (701) are connected via a detachable movable mechanism, and the detachable movable mechanism comprises a connecting block A (703) fixed to one of the cranks (701); a surface of the connecting block A (703) is provided with threaded teeth (7031); and keyways (7032) are provided on both sides of a circumferential surface of the connecting block A (703); The connection block A (703) is threadedly connected to a fastening ring block (705) at a position relative to the thread teeth (7031); an adjusting ring block (706) is rotatably provided inside the fastening ring block (705); and a limiting pin block (707) is provided on the inner wall of the adjusting ring block (706) and is plugged into and engaged with the keyway (7032); A connecting block B (704) is provided on the other crank (701) at a side relatively close to the connecting block A (703); and an adjusting adaption groove (7041) is provided on the surface of the connecting block B (704).

7. The ventilation duct welding support device according to claim 6, characterized in that: The inner wall support mechanism (8) comprises a piston slider (801) rotatably arranged at the end of the movable drive arm (702); a fixed drive connecting shaft (802) is provided on the piston slider (801); the fixed drive connecting shaft (802) is passed through the connecting groove (6021); The outer side of the piston slider (801) is provided with an annular connecting frame (803) fixedly connected to the fixed drive connecting shaft (802); the annular connecting frame (803) is provided with a guide rail shaft (804) distributed in an arc shape; the annular connecting frame (803) is provided with support arms (809) at both ends relative to the guide rail shaft (804) through hinge seats; an adaptive slider (805) is slidably provided on the guide rail shaft (804); the adaptive slider (805) is hingedly provided with a force-bearing arm (806) hingedly connected to the support arm (809); the adaptive slider (805) is elastically connected to the annular connecting frame (803) through a spring; Furthermore, the support arm (809) is rotatably provided with a friction wheel (808).

8. The ventilation duct welding support device according to claim 7, characterized in that: The support arm (809) and the friction wheel (808) are connected by a ratchet; and the friction wheel (808) is in a ratchet release state along the direction from the end support assembly (4) to the central drive assembly (2), and the friction wheel (808) is in a ratchet engagement state along the direction from the central drive assembly (2) to the end support assembly (4).

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