A pulling, forming and laser welding system

Abstract

The present invention provides a traction, forming and laser welding system, which conveys steel strips. The system includes a discharge wheel, a preforming device, a forming device, a traction device and a receiving device which are arranged in sequence. The preforming system includes a plurality of longitudinal forming wheel molds, and the longitudinal forming wheel mold includes an upper shaft and a lower shaft. The upper shaft and the lower shaft are provided with cams and concave wheels. The protruding part of the cam and the concave part of the concave wheel clamp the end of the steel strip. The forming device includes a forming base and a welding device. The forming base is provided with a hole mold. The inner diameter of the hole mold gradually decreases along the conveying direction of the steel strip. The traction device includes a circulating transmission device, a traction mold group and a clamping device. The traction mold group includes a left traction mold and a right traction mold. The clamping device includes a left limit plate and a right limit plate. The left limit plate and the right limit plate clamp the left mold seat and the right mold seat. The clamping device allows the steel strip to pass in the form of a full-circular tube.

Description

Technical Field

[0001] The present invention relates to the technical field of medical pipes, and in particular to a pulling, forming and laser welding system. Background Art

[0002] In the current medical stainless steel manufacturing field, pipes are produced by rolling them into a true circle through multiple horizontal and vertical forming wheels, and then forming them through argon arc welding. First, the horizontal and vertical combination of the forming wheels is relatively difficult to match, and the true roundness is poor. Secondly, argon arc welding generates high heat, the welding head is easily worn, and the weld is wide and uneven. As a result, only thicker steel strips with a wall thickness of 0.14mm can be welded, making it impossible to mass-produce ultra-fine and ultra-thin pipes.

[0003] In addition, laser welding is currently used in the welding of medical tubes. Without a good forming and traction system, the laser-welded tubes will not meet the performance requirements of medical needles. Summary of the Invention

[0004] The object of the present invention is to provide a pulling, forming and laser welding system.

[0005] In order to achieve the above object, the technical solution of the present invention is:

[0006] A traction, forming and laser welding system, characterized in that the system conveys steel strips, and the system comprises a discharge wheel, a preforming device, a forming device, a traction device and a receiving device arranged in sequence,

[0007] The preforming system includes a plurality of longitudinal forming wheel molds, each of which includes an upper shaft and a lower shaft, the upper shaft and the lower shaft are symmetrically arranged up and down, and the upper shaft and the lower shaft are respectively provided with a cam and a concave wheel, the protrusion of the cam cooperates with the concave part of the concave wheel to clamp the upper and lower ends of the steel strip, the left and right sides of the protrusion and the concave part are provided with matching arc chamfers, the width of the protrusion and the concave part gradually decreases along the conveying direction of the steel strip, and the preforming system causes the left and right sides of the steel strip to gradually rise to form an elliptical shape with an open upper end;

[0008] The forming device includes a forming base and a welding device. The upper part of the forming base is provided with a plurality of hole dies along the conveying direction of the steel strip. The hole dies are provided with through holes for the steel strip to pass through. The inner diameter of the through holes of the hole dies gradually decreases along the conveying direction of the steel strip. The forming device causes the steel strip to be wound into a circular shape with an open top. The welding device welds the steel strip by laser.

[0009] The traction device includes a circulating transmission device, a plurality of traction die sets and a clamping device. The circulating transmission device is driven by the cooperation of two sprockets and a chain. The chain is provided with a plurality of chain plates. The traction die set is located between two adjacent chain plates.

[0010] The traction mold group includes a guide rail, which is fixed to the outside of the chain. A left mold seat and a right mold seat are respectively provided on both sides of the guide rail. The left mold seat and the right mold seat are movably connected to the guide rail through a slider. The left mold seat and the right mold seat are connected by a reset spring. The right end of the left mold seat is provided with a left traction mold, and the left end of the right mold seat is provided with a right traction mold. The left traction mold and the left mold seat, and the right mold seat and the right mold seat are connected by positioning pins. The adjacent sides of the left traction mold and the left traction mold are provided with symmetrical semicircular arc recesses.

[0011] The clamping device includes a left limit plate and a right limit plate, which symmetrically clamp the left mold base and the right mold base. The right side of the left limit plate and the left side of the right limit plate are successively provided with an open oblique line segment and a clamping straight line segment along the system conveying direction. The spacing of the open oblique line segments gradually decreases along the system conveying direction, and the spacing of the clamping straight line segments is constant to the spacing at the end of the open oblique line segment. When the left mold base and the right mold base move to the end of the open oblique line segment, the left traction mold and the right traction mold are closed to form a circular through hole, and the clamping device allows the steel strip to pass through in the form of a full-circular tube.

[0012] Furthermore, the circulating transmission device includes a double-row driving sprocket and a double-row passive sprocket, and the double-row driving sprocket and the double-row passive sprocket are respectively fixed to the outside of a hub, and the hub of the double-row driving sprocket is driven to rotate by a servo motor, and the double-row driving sprocket drives the double-row passive sprocket to rotate through a chain.

[0013] Furthermore, a mounting step is provided on the right side of the left mold and the left side of the right mold seat, the left traction mold and the right traction mold are installed on the upper end of the mounting step, and the positioning pin vertically passes through the left traction mold and the right traction mold and is positioned with the mounting step.

[0014] Furthermore, a left pre-stressed spring sheet is provided at the upper end of the left mold seat, and a right pre-stressed spring sheet is provided at the upper end of the right mold seat. The left pre-stressed spring sheet and the right pre-stressed spring sheet limit the vertical floating of the left traction mold and the right traction mold.

[0015] Furthermore, the unwinding wheel and the preforming system are provided with a tension controller, and the tension of the steel strip is maintained by the tension controller.

[0016] Furthermore, a positioning plate seat is provided at the upper end of the forming base, and a width-fixing plate is vertically fixed on the outer side of the positioning plate seat. The width-fixing plate is located at the outlet of the forming base, and the width-fixing plate extends radially in the hole mold. The bottom end of the width-fixing plate is close to the center of the hole mold, and the width-fixing plate is separated so that laser welding gaps are left on both sides of the steel strip after winding.

[0017] Furthermore, the welding device is provided with a CCD detector.

[0018] Furthermore, bearings are provided at both ends of the upper shaft and the lower shaft, bearing seats are provided on the outer sides of the bearings, and the bearing seat of the lower shaft is supported on the work surface through a support.

[0019] Furthermore, a left slider and a right slider are provided on the left and right sides of the guide rail, the left slider and the right slider are movably connected to the guide rail, and the left slider and the right slider are fixedly connected to the left mold base and the right mold base respectively.

[0020] Furthermore, the material receiving device includes a winding wheel, which winds up the round tube.

[0021] The present invention realizes pipe pulling, forming and laser welding by combining a preforming device, a forming device and a pulling device. The cam and the concave wheel are combined into a forming wheel, which is driven to rotate by friction to achieve a consistent running speed, thus solving the problem of poor forming caused by different straight line running of the pipe.

[0022] The present invention uses laser welding with CCD detection and protective gas. When the pipe passes through the welding positioning device, the positioning plate ensures the width of the welding gap and the opening position moves linearly without deviation.

[0023] The present invention forms a full circle by closing a group of semicircular arc pulling molds, which are connected horizontally by a reset spring and vertically limited by a positioning pin. The spring piece limits the up and down floating, and the axis of the pipe is positioned in the free position. The pipe is then clamped by a group of limiting plates with a diagonal structure to prevent the pipe from being clamped. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 Schematic diagram of the structure of the preforming device of the present invention;

[0026] Figure 3 Schematic diagram of the structure of the first cam and the first concave wheel of the present invention;

[0027] Figure 4 It is a schematic structural diagram of the second cam and the second concave wheel of the present invention;

[0028] Figure 5 Schematic diagram of the structure of the third cam and the third concave gear of the present invention;

[0029] Figure 6 This is a schematic structural diagram of the hole die of the forming device of the present invention;

[0030] Figure 7 This is a schematic diagram of the front structure of the molding device of the present invention;

[0031] Figure 8It is a side structural schematic diagram of the molding device of the present invention;

[0032] Figure 9 This is a schematic diagram of the side structure of the fixed width plate of the present invention;

[0033] Figure 10 This is a schematic diagram of the winding of the steel strip after passing through the preforming device and the forming device of the present invention;

[0034] Figure 11 Schematic diagram of the structure of the circulating transmission device of the present invention;

[0035] Figure 12 This is a front structural diagram of the traction die set of the present invention;

[0036] Figure 13 This is a side structural diagram of the traction die set of the present invention;

[0037] Figure 14 This is a schematic structural diagram of the mold clamping device in conjunction with the circulating transmission device of the present invention;

[0038] Figure 15 It is a structural schematic diagram of the mold clamping device of the present invention.

[0039] Reference numerals:

[0040] 1 unwinding wheel, 2 tension controller, 3 preforming device, 4 forming device, 5 welding device,

[0041] 6 CCD detector, 7 traction device, 8 winding wheel, 9 steel belt, 10 upper and lower positioning wheels,

[0042] 11 left and right positioning wheels, 12 upper positioning wheel, 13 lower positioning wheel, 14 round pipe,

[0043] 31 cam, 32 concave wheel, 311 first cam, 312 second cam, 313 third cam,

[0044] 321 first concave wheel, 322 second concave wheel, 323 third concave wheel,

[0045] 33 lower shaft, 34 upper shaft, 35 support, 36 bearing seat, 37 bearing,

[0046] 41 forming base, 410 hole mold support block, 411 hole mold base,

[0047] 42 first hole mold, 43 second hole mold, 44 third hole mold, 45 fourth hole mold,

[0048] 46 fifth hole mold, 47 sixth hole mold, 48 positioning plate seat, 49 fixed width plate, 491 fixed width plate bottom,

[0049] 711 left arc traction mold, 712 right arc traction mold, 721 left preload spring, 722 right preload spring,

[0050] 73 positioning pin, 741 left mold base, 742 right mold base, 743 left mold base left end, 744 right mold base right end,

[0051] 75 right slider, 76 guide rail, 77 chain, 771 chain plate, 78 double row passive sprocket,

[0052] 791 left limit plate, 792 right limit plate,

[0053] 80 double row driving sprocket, 81 wheel hub, 82 connecting plate, 83 left slider, 84 return spring,

[0054] 85 clamping straight line segment, 86 opening oblique line segment, 87 exit oblique line segment,

[0055] 911 passes through the steel belt behind the first cam and the first cam,

[0056] 912 passes through the steel belt behind the second cam and the second concave wheel,

[0057] 913 passes through the steel belt behind the third cam and the third concave wheel,

[0058] 921 steel strip after passing through the first hole die,

[0059] 922 steel strip after passing through the second hole die,

[0060] 923 steel strip after passing through the third hole die,

[0061] 924 steel strip after passing through the fourth hole die,

[0062] 925 steel strip after passing through the fifth hole die,

[0063] 926 steel strip after passing through the sixth hole die. DETAILED DESCRIPTION

[0064] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0065] The present invention discloses a pulling, forming and laser welding system, the system conveys a steel belt 9, such as Figure 1As shown, the system includes a discharge wheel 1, a preforming device 4, a forming device 4, a traction device 7 and a receiving device arranged in sequence. A long plate-shaped steel strip 9 is placed on the discharge wheel 1. The discharge wheel 1 has an adjustable spring pre-tightening device. The discharge wheel 1 and the preforming system are provided with a tension controller 2. The tension of the steel strip 9 is maintained by the tension controller 2. The tension controller 2 uses a tension sensor to control the tension of the steel strip 9 between the discharge wheel 1 and the preforming system to achieve a balanced state.

[0066] like Figure 1 As shown, a set of upper and lower positioning wheels 1310 and left and right positioning wheels 11 are provided between the tension controller 2 and the unloading wheel 1, and a set of upper and lower positioning wheels 1310 and left and right positioning wheels 11 are also provided between the tension system and the tension controller 2. The two sets of positioning wheels ensure the stability of the system conveying steel belt 9.

[0067] The preforming system includes several longitudinal forming wheel molds, each of which includes an upper shaft 34 and a lower shaft 33. The upper shaft 34 and the lower shaft 33 are symmetrically arranged up and down. Bearings 37 are provided at both ends of the upper shaft 34 and the lower shaft 33. A bearing seat 36 is provided on the outer side of the bearing 37. The bearing seat 36 of the lower shaft 33 is supported on the work table through a support 35.

[0068] The upper shaft 34 and the lower shaft 33 are respectively provided with a cam 31 and a concave wheel 32. The protruding portion of the cam 31 cooperates with the concave portion of the concave wheel 32 to clamp the upper and lower ends of the steel belt 9. The left and right sides of the protruding portion and the concave portion are provided with matching arc chamfers.

[0069] like Figures 3 to 5 As shown, the preforming system adopts three longitudinal forming wheel molds. The widths of the raised parts of the first cam 311, the second cam 312, and the third cam 313, and the recessed parts of the first concave wheel 321, the second concave wheel 322, and the third concave wheel 323 gradually decrease along the conveying direction of the steel strip 9. After the steel strip 9 passes through the above three groups of cam structures, the left and right sides of the steel strip 9 are gradually lifted up to form an elliptical shape with an open upper end. The figure marks 911~913 are the steel strip 9 after passing through the first cam 311 and the first concave wheel 321, the second cam 312 and the second concave wheel 322, and the third cam 313 and the third concave wheel 323, respectively.

[0070] During implementation, the cam 31 is installed on the upper shaft 34, and the concave wheel 32 is installed on the lower shaft 33. They can also be installed alternately. The upper shaft 34 and the lower shaft 33 do not need to be connected to a motor or other power source. The steel belt 9 is driven to move linearly by the traction system. When passing through each cam and concave wheel, friction drives the forming wheel to rotate to achieve a consistent operating speed.

[0071] like Figure 6 and Figure 7As shown, the forming device 4 includes a forming base 41 and a welding device 5. The forming base 41 includes a hole die support block 410 and a hole die base 411 connected in sequence from top to bottom. The upper part of the forming base 41 is provided with a plurality of hole dies along the conveying direction of the steel strip 9. The hole die is provided with a through hole for the steel strip 9 to pass through. The inner diameter of the hole die through hole gradually decreases along the conveying direction of the steel strip 9. The forming device 4 causes the steel strip 9 to be wound into a circle with an open upper end.

[0072] like Figure 9 As shown, a positioning plate seat 48 is provided at the upper end of the forming base 41, and a width-fixing plate 49 is fixed vertically on the outer side of the positioning plate seat 48. The width-fixing plate 49 is located at the outlet of the forming base 41, and the width-fixing plate 49 extends radially in the hole mold. The bottom end 491 of the width-fixing plate is close to the center of the hole mold, and the bottom end 491 of the width-fixing plate is an arc-shaped contraction structure from top to bottom, and the arc-shaped contraction cooperates with the arc-shaped end face of the steel strip 9 after winding.

[0073] The steel strip 9 is separated by a fixed width plate 49 so that a laser welding gap is left on both sides after winding. The welding device 5 welds the steel strip 9 by laser. The welding device 5 is provided with a CCD detector 6 coordinated with the welding device 5. The CCD detector 6 performs online detection of the appearance of the welded steel strip 9. If it does not meet the set requirements, an alarm will be immediately issued, which is convenient for the operator to visually observe the welding condition and make timely adjustments.

[0074] Laser welding is carried out in conjunction with CCD detection. Shielding gas is used in laser welding. A positioning plate is provided in the middle of the opening of the steel strip 9 to ensure the width of the welding gap of the steel strip 9 and that the gap position of the steel strip 9 moves linearly without deviation.

[0075] like Figure 6 and Figure 10 As shown, the hole die includes six hole dies 42, 43, 44, 45, 46 and 47 with diameters from large to small. The number of hole dies can also be more than six. The elliptical steel strip 9 is gradually passed through the hole dies of different diameters and gradually becomes circular. Under the action of the width-fixing plate 49, a welding seam is maintained. The size of this welding seam is designed according to the different wall thicknesses of the steel strip 9. Figure 6 Reference numerals 921 to 926 represent cross sections of the steel strip 9 after passing through the first hole die 42 , the second hole die 43 , the third hole die 44 , the fourth hole die 45 , the fifth hole die 46 and the sixth hole die 47 , respectively.

[0076] The traction device 7 includes a circulating transmission device, a plurality of traction die sets and a clamping device. The circulating transmission device is driven by the cooperation of two sprockets and a chain 77. The chain 77 is provided with a plurality of chain plates 771. The traction die set is located between two adjacent chain plates 771.

[0077] like Figure 11As shown, the circulating transmission device specifically includes a double-row driving sprocket 80 and a double-row passive sprocket 78. The double-row driving sprocket 80 and the double-row passive sprocket 78 are respectively fixed to the outside of a hub 81. The hub 81 of the double-row driving sprocket 80 is driven to rotate by a servo motor, and the double-row driving sprocket 80 drives the double-row passive sprocket 78 to rotate through the chain 77.

[0078] like Figure 12 and Figure 13 As shown, the traction mold group includes a guide rail 76, which is fixed to the outside of the chain 77 through a connecting plate 82. A left mold seat 741 and a right mold seat 742 are respectively provided on both sides of the guide rail 76. The left mold seat 741 and the right mold seat 742 are movably connected to the guide rail 76 through sliders. The specific connection relationship is that a left slider 83 and a right slider 75 are provided on the left and right sides of the guide rail 76, and the left slider 83 and the right slider 75 are movably connected to the guide rail 76. The left slider 83 and the right slider 75 are fixedly connected to the left mold seat 741 and the right mold seat 742 respectively.

[0079] The left mold seat 741 and the right mold seat 742 are connected by a return spring 84. The right end of the left mold seat 741 is provided with a left traction mold 711, and the left end of the right mold seat 742 is provided with a right traction mold 712. The left traction mold 711 and the left mold seat 741, and the right mold seat 742 and the right mold seat 742 are connected by a positioning pin 73. The adjacent sides of the left traction mold 711 and the left traction mold 711 are provided with symmetrical semicircular arc depressions.

[0080] When the left mold seat 741 and the right mold seat 742 are pushed inward, the return spring 84 is compressed, and the left traction mold 711 and the right traction mold 712 are closed to form a full circle. The thrust return spring 84 is released to reset, and the left traction mold 711 and the right traction mold 712 are separated to facilitate the entry of the steel belt 9.

[0081] There is a mounting step on the right side of the left mold and the left side of the right mold seat 742. The left traction mold 711 and the right traction mold 712 are installed on the upper end of the mounting step. The positioning pin 73 vertically penetrates the left traction mold 711 and the right traction mold 712 and is positioned with the mounting step.

[0082] A left pre-stress spring piece 721 is provided at the upper end of the left mold seat 741, and a right pre-stress spring piece 722 is provided at the upper end of the right mold seat 742. The left pre-stress spring piece 721 and the right pre-stress spring piece 722 limit the vertical floating of the left traction mold 711 and the right traction mold 712. The left traction mold 711 and the right traction mold 712 rotate around the positioning pin 73 as the axis, and the circular tube 14 is positioned and clamped along its axis to prevent the circular tube 1 from being clamped.

[0083] like Figure 14 and Figure 15As shown, the clamping device includes a left limit plate 791 and a right limit plate 792, and the left limit plate 791 and the right limit plate 792 symmetrically clamp the left mold base 741 and the right mold base 742. The right side of the left limit plate 791 and the left side of the right limit plate 792 are provided with an opening oblique line segment 86 and a clamping straight line segment 85 in sequence along the system conveying direction. The spacing of the opening oblique line segment 86 gradually decreases along the system conveying direction, and the spacing of the clamping straight line segment 85 is constant at the spacing at the end of the opening oblique line segment 86. When the left mold base 741 and the right mold base 742 move to the end of the opening oblique line segment 86, the left traction mold 711 and the right traction mold 712 are closed to form a circular through hole, and the clamping device allows the steel strip 9 to pass through in the form of a full-circular tube. The right side of the left limit plate 791 and the rear part of the left side of the right limit plate 792 are provided with an outlet oblique line segment 87, and the spacing of the outlet oblique line segment 87 gradually increases along the system conveying direction.

[0084] When the compressed return spring 84 is reset, the left traction mold 711 and the right traction mold 712 are in an open state when passing through the oblique line segment, and the steel belt 9 located between the left traction mold 711 and the right traction mold 712 is not clamped. When the left end 743 of the left mold seat and the right end 744 of the right mold seat gradually contact the straight line segment, the left and right traction molds 712 are closed, and the round tube 14 is formed into a full circle and clamped to realize linear motion. When passing through the exit segment, the left traction mold 711 and the right traction mold 712 are opened under the elasticity of the return spring 84 and enter the next operation cycle.

[0085] The chain plate 771 is installed with multiple traction mold groups, and the chain 77 is driven by the servo motor to move on the slide rail. The two rows of chains 77 correspond to the left traction mold 711 and the right traction mold 712 respectively. When the left traction mold 711 and the right traction mold 712 pass through the mold clamping device, the two semicircular arc molds are combined into a full-circular through hole, clamping the circular tube 14 passing through the middle. The left traction mold 711 and the right traction mold 712 generate friction with the outer surface of the steel belt 9, and under the action of the friction, the circular tube 14 is driven to move continuously in a straight line.

[0086] An upper positioning wheel 12 and a lower positioning wheel 13 are provided at the rear end of the traction device 7 , and the material receiving device includes a winding wheel 8 , which winds up the round tube 14 .

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pulling, forming and laser welding system, characterized in that: The system conveys steel strips, and the system includes a discharge wheel, a preforming device, a forming device, a traction device and a receiving device arranged in sequence. The preforming device includes a plurality of longitudinal forming wheel molds, each of which includes an upper shaft and a lower shaft, the upper shaft and the lower shaft are symmetrically arranged up and down, and the upper shaft and the lower shaft are respectively provided with a cam and a concave wheel, the protrusion of the cam cooperates with the concave part of the concave wheel to clamp the upper and lower ends of the steel strip, the left and right sides of the protrusion and the concave part are provided with matching arc chamfers, the width of the protrusion and the concave part gradually decreases along the conveying direction of the steel strip, and the preforming device gradually lifts the left and right sides of the steel strip to form an elliptical shape with an open upper end; The forming device includes a forming base and a welding device. The upper part of the forming base is provided with a plurality of hole dies along the conveying direction of the steel strip. The hole dies are provided with through holes for the steel strip to pass through. The inner diameter of the through holes of the hole dies gradually decreases along the conveying direction of the steel strip. The forming device causes the steel strip to be wound into a circular shape with an open top. The welding device welds the steel strip by laser. The traction device includes a circulating transmission device, a plurality of traction die sets and a clamping device. The circulating transmission device is driven by the cooperation of two sprockets and a chain. The chain is provided with a plurality of chain plates. The traction die set is located between two adjacent chain plates. The traction mold group includes a guide rail, which is fixed to the outside of the chain. A left mold seat and a right mold seat are respectively provided on both sides of the guide rail. The left mold seat and the right mold seat are movably connected to the guide rail through a slider. The left mold seat and the right mold seat are connected by a reset spring. The right end of the left mold seat is provided with a left traction mold, and the left end of the right mold seat is provided with a right traction mold. The left traction mold and the left mold seat, and the right mold seat and the right mold seat are connected by positioning pins. The adjacent sides of the left traction mold and the left traction mold are provided with symmetrical semicircular arc recesses. The clamping device includes a left limit plate and a right limit plate, which symmetrically clamp the left mold base and the right mold base. The right side of the left limit plate and the left side of the right limit plate are successively provided with an open oblique line segment and a clamping straight line segment along the system conveying direction. The spacing of the open oblique line segments gradually decreases along the system conveying direction, and the spacing of the clamping straight line segments is constant to the spacing at the end of the open oblique line segment. When the left mold base and the right mold base move to the end of the open oblique line segment, the left traction mold and the right traction mold are closed to form a circular through hole, and the clamping device allows the steel strip to pass through in the form of a full-circular tube.

2. The pulling, forming and laser welding system according to claim 1, characterized in that: The circulating transmission device includes a double-row driving sprocket and a double-row passive sprocket, which are respectively fixed to the outside of a hub. The hub of the double-row driving sprocket is driven to rotate by a servo motor, and the double-row driving sprocket drives the double-row passive sprocket to rotate through a chain.

3. The pulling, forming and laser welding system according to claim 1, characterized in that: A mounting step is respectively provided on the right side of the left mold and the left side of the right mold base. The left traction mold and the right traction mold are installed on the upper ends of the mounting steps. The positioning pin vertically penetrates the left traction mold and the right traction mold and is positioned with the mounting steps.

4. The pulling, forming and laser welding system according to claim 3, characterized in that: The upper end of the left mold base is provided with a left pre-stressed spring sheet, and the upper end of the right mold base is provided with a right pre-stressed spring sheet. The left pre-stressed spring sheet and the right pre-stressed spring sheet limit the vertical floating of the left traction mold and the right traction mold.

5. The pulling, forming and laser welding system according to claim 1, characterized in that: The unwinding wheel and the preforming device are provided with a tension controller, and the tension of the steel strip is maintained by the tension controller.

6. The pulling, forming and laser welding system according to claim 1, characterized in that: A positioning plate seat is provided at the upper end of the forming base, and a width-fixing plate is fixed vertically on the outer side of the positioning plate seat. The width-fixing plate is located at the outlet of the forming base, and extends radially in the hole mold. The bottom end of the width-fixing plate is close to the center of the hole mold, and the width-fixing plate is separated so that a laser welding gap is left on both sides of the steel strip after winding.

7. The pulling, forming and laser welding system according to claim 6, characterized in that: The welding device is provided with a CCD detector.

8. The pulling, forming and laser welding system according to claim 1, characterized in that: Both ends of the upper shaft and the lower shaft are provided with bearings, the outer sides of the bearings are provided with bearing seats, and the bearing seat of the lower shaft is supported on the work table through a support.

9. The pulling, forming and laser welding system according to claim 1, characterized in that: A left slider and a right slider are provided on the left and right sides of the guide rail. The left slider and the right slider are movably connected to the guide rail, and the left slider and the right slider are fixedly connected to the left mold base and the right mold base respectively.

10. The pulling, forming and laser welding system according to claim 1, characterized in that: The material receiving device includes a winding wheel, and the winding wheel winds up the round tube.

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