A production line for ultra-thin seamless metal pipes

Abstract

The present invention relates to the field of production lines for ultra-fine seamless metal tubes. The production line comprises a material rack, a feeding mechanism, a first positioning mechanism, a pre-pressing mechanism, a second positioning mechanism, a forming mechanism, a third positioning mechanism, and a welding mechanism to produce seamless metal tubes. Coiled metal sheets are used as the production raw material. The position of the metal sheets at each workstation in the production line is stable and does not change due to loading or unloading. This improves the production accuracy of the ultra-fine seamless metal tubes and, by eliminating the loading and unloading processes, increases production efficiency.

Description

Technical Field

[0001] The invention relates to the field of production lines for ultra-thin seamless metal pipes. Background Art

[0002] The Chinese patent with publication number CN217451548U is a device for manufacturing ultra-fine metal tubes applied by the inventor on March 7, 2022, which includes a die, a left die, a right die, a needle guard and a punch; a groove is provided in the middle of the die, and the inner sides of the upper edge of the groove are respectively provided with rounded corners; the left die and the right die are provided on both sides of the groove, and the inner lower edges are respectively provided with rounded corners; the center line of the needle guard coincides with the center line of the groove and is placed horizontally on one side of the die; the punch is provided directly above the groove; the left die, the right die, the needle guard and the punch are respectively connected to their respective drive mechanisms. The benefit of this invention is that the pre-cut sheet is placed in the mold for rapid coiling and then welded into shape.

[0003] The radial dimension of ultrafine metal tubes is very small. When using existing equipment to manufacture ultrafine metal tubes, the ultrafine metal tubes need to be transferred between various workstations. Each transfer requires the ultrafine metal tubes to be placed in a piece of equipment. For example, before welding, the gap position on the ultrafine metal tube needs to be aligned with the welding gun, which affects the processing accuracy and efficiency of the ultrafine metal tubes. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a production line for ultra-fine seamless metal tubes, which can continuously produce ultra-fine seamless metal tubes and improve the processing accuracy and processing efficiency of ultra-fine metal tubes.

[0005] The technical solution adopted by the present invention to solve the problem is: a production line for ultra-fine seamless metal pipes, comprising:

[0006] A material rack for storing rolled metal sheets; a first positioning mechanism for receiving the metal sheets output from the material rack and positioning the metal sheets left and right and up and down; a pre-pressing mechanism for receiving the metal sheets output from the first positioning mechanism and pressing the cross-section of the metal sheets into an arc or a broken line, so that the metal sheets become semi-finished products; a second positioning mechanism for receiving the semi-finished products output from the pre-pressing mechanism and positioning the semi-finished products left and right and up and down; a forming mechanism for receiving the semi-finished products output from the second positioning mechanism and pressing the cross-section of the semi-finished products into a closed shape; a third positioning mechanism for receiving the semi-finished products output from the forming mechanism and positioning the semi-finished products left and right and up and down; a welding mechanism for receiving the semi-finished products output from the third positioning mechanism and welding the two edges on the side walls of the semi-finished products to each other to produce a seamless metal tube; a pulling mechanism for pulling the end of the seamless metal tube backward.

[0007] Rolled metal sheets are used as production raw materials. The position of the metal sheets at each workstation in the ultra-fine seamless metal tube production line is stable and will not change due to loading or unloading actions. Therefore, the production accuracy of the ultra-fine seamless metal tube can be improved. At the same time, since the loading and unloading actions are omitted, the production efficiency can be improved.

[0008] As a further improved technical solution, it also includes a feeding mechanism, which is used to pull the metal sheets on the material rack and transport the metal sheets backward to the first positioning mechanism; it also includes a fourth positioning mechanism and a detection mechanism; the fourth positioning mechanism is used to receive the seamless metal tube output from the welding mechanism and position the left and right and up and down positions of the seamless metal tube; the detection mechanism is used to receive the seamless metal tube output from the fourth positioning mechanism and perform visual inspection on the welds of the seamless metal tube. This technical solution is used to detect the welding quality of the seamless metal tube to distinguish qualified products from unqualified products.

[0009] As a further improved technical solution, it also includes a control center, a cutting mechanism, a sorting mechanism and a pulling mechanism. The detection mechanism, the sorting mechanism and the pulling mechanism are all electrically connected to the control center; the pulling mechanism is used to pull backward the end of the seamless metal tube output from the detection mechanism; the cutting mechanism is used to cut off the seamless metal tube between the detection mechanism and the pulling mechanism to obtain an ultra-fine seamless metal tube with a certain length. The sorting mechanism can sort the ultra-fine seamless metal tube to different areas according to different results detected by the detection mechanism.

[0010] As an optional technical solution, the feeding mechanism includes an upper transmission roller, a lower transmission roller, a transmission gear and a power mechanism. The transmission gear is fixedly installed on one end of the upper transmission roller or one end of the lower transmission roller. The power mechanism is connected to the transmission gear to drive the upper transmission roller or the lower transmission roller to rotate. A transmission channel arranged along the front and rear directions is provided between the upper transmission roller and the lower transmission roller. The metal sheet is provided in the transmission channel. The upper transmission roller and the lower transmission roller can transmit the metal sheet in the transmission channel backward along the transmission channel. The upper transmission roller and the lower transmission roller are both spindle-shaped with a large middle part and small two ends.

[0011] As an optional technical solution, the first positioning mechanism includes a first positioning platform and a first positioning roller, the first positioning platform is provided with a first positioning groove with a top opening, the first positioning roller is arranged on the upper side of the first positioning groove, the first positioning groove is used to accommodate the metal sheet, the entrance end of the first positioning groove is provided with a transition bell mouth, the number of the first positioning rollers is multiple, and the positioning grooves and the multiple first positioning rollers are arranged in the front-to-back direction.

[0012] As an optional technical solution, the pre-stressing mechanism includes a pre-stressing upper punch, an upper pre-stressing drive mechanism, a pre-stressing lower punch, a lower pre-stressing drive mechanism, a left die and a right die, the left die and the right die are symmetrically arranged on the left and right, and a first step is provided on the left die and the right die, the first step is used to place the metal sheet, the top of the pre-stressing lower punch is provided with an arc-shaped through groove arranged along the front-to-back direction, the vertical cross-section line of the pre-stressing upper punch is arc-shaped, and an installation gap is provided between the left die and the right die, the upper part of the pre-stressing lower punch is arranged in the installation gap, the pre-stressing upper punch is arranged on the upper side of the pre-stressing lower punch, the upper pre-stressing drive mechanism is used to drive the pre-stressing upper punch to move up and down, and the lower pre-stressing drive mechanism can drive the left die and the right die to move up and down so that the first step can be moved to the left and right sides of the pre-stressing upper punch.

[0013] The upper pre-pressing drive mechanism drives the pre-pressing upper punch to move downward to press the metal sheet against the lower punch, and then the lower pre-pressing drive mechanism drives the left die and the right die to move upward so that the first step is moved to the left and right sides of the pre-pressing upper punch, so that the left and right parts of the metal sheet are bent upward, and the cross-section of the metal sheet is bent into a U shape, and then the lower pre-pressing drive mechanism drives the left die and the right die to return downward, and the upper pre-pressing drive mechanism drives the pre-pressing upper punch to return upward.

[0014] As an optional technical solution, the widths of the arc-shaped through groove, the installation gap, the upper pre-pressing punch, and the lower pre-pressing punch gradually change along the front-to-back direction, thereby producing an ultra-fine seamless metal tube with a gradually changing diameter.

[0015] As an optional technical solution, the second positioning mechanism includes a front positioning punch, a front positioning die, a rear positioning punch, a rear positioning die, and a middle positioning assembly. A front positioning groove is provided between the front positioning punch and the front positioning die, and a rear positioning groove is provided between the rear positioning punch and the rear positioning die. The middle positioning assembly is provided between the front positioning groove and the rear positioning groove. The middle positioning assembly includes a roller group, and the roller group includes two adjacent rollers on the left and right. The central axis of the roller is vertically arranged, and a recessed annular feeding trough is provided on the side wall of the roller.

[0016] As an optional technical solution, the forming mechanism includes an upper forming die, a forming drive mechanism, and a lower forming die. The top of the lower forming die is provided with a lower forming groove with an arc-shaped cross-section, and the bottom of the upper forming die is provided with an upper forming groove with an arc-shaped cross-section. The mouth of the upper forming groove is provided with a second step, which is adapted to and abuts against the lower forming die. The upper forming groove and the lower forming groove are combined into a channel with a circular cross-section. The forming drive mechanism is transmission-connected to the upper forming die and drives the upper forming die to approach or move away from the lower forming die.

[0017] As an optional technical solution, the third positioning mechanism is consistent with the structure of the middle positioning assembly.

[0018] As an optional technical solution, the welding mechanism includes a pallet, a first row, a first row driving mechanism, a second row, a second row driving mechanism, a welding head, a welding head driving mechanism and a blow pipe. The pallet is provided with a welding positioning groove, the first row and the second row are symmetrically arranged on the left and right, and the first row and the second row are both provided with a clamping groove, and the clamping groove is connected to the welding positioning groove. The first row driving mechanism is used to drive the first row to move left and right, and the second row driving mechanism is used to drive the second row to move left and right; the welding head driving mechanism is used to drive the welding head to move.

[0019] As an optional technical solution, the fourth positioning mechanism includes a roller group, which includes two adjacent rollers on the left and right. The central axis of the roller is vertically arranged, and a recessed annular feeding trough is provided on the upper part of the side wall of the roller. The feeding trough can expose the parts of the seamless metal pipe that need to be welded while conveying the seamless metal pipe, thereby facilitating welding.

[0020] As an optional technical solution, the pulling mechanism includes a tensioning chuck and a clamping power mechanism, the tensioning chuck is used to clamp the seamless metal tube, and the clamping power mechanism is used to drive the tensioning chuck to clamp or release the seamless metal tube.

[0021] As an optional technical solution, the cutting mechanism is a circular knife or a laser cutting device.

[0022] As an optional technical solution, the sorting mechanism includes a robot and a chuck provided at the end of the robot, and the chuck is used to clamp the ultra-fine seamless metal tube.

[0023] The beneficial effects of the present invention are: using rolled metal sheets as production raw materials, the position of the metal sheets at each workstation in the production line of ultra-fine seamless metal tubes is stable, and the position will not change due to loading or unloading actions, thereby improving the production accuracy of ultra-fine seamless metal tubes. At the same time, because the loading and unloading actions are omitted, the production efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1 It is a top view of the metal sheet;

[0026] Figure 2 It is a side view of a metal sheet;

[0027] Figure 3 is a cross-sectional view of an ultra-fine seamless metal tube;

[0028] Figure 4 It is a three-dimensional diagram of an ultra-fine seamless metal tube;

[0029] Figure 5 A top view of the production line for ultra-fine seamless metal tubes of the present invention (excluding the material rack);

[0030] Figure 6 A side view of a production line for ultra-thin seamless metal tubes according to the present invention;

[0031] Figure 7 It is a side view of the feeding mechanism of the present invention;

[0032] Figure 8 A top view of the feeding mechanism of the present invention;

[0033] Figure 9 is a top view of the first positioning mechanism of the present invention;

[0034] Figure 10 It is a front view of the first positioning mechanism of the present invention;

[0035] Figure 11 for Figure 9 A magnified view of part A;

[0036] Figure 12 for Figure 10 A magnified view of part B;

[0037] Figure 13 for Figure 12 Magnified view of part C;

[0038] Figure 14 It is a side view of the pre-pressing mechanism of the present invention;

[0039] Figure 15 It is a rear view of the pre-pressing mechanism of the present invention;

[0040] Figure 16 It is a partial enlarged view of the pre-pressing mechanism of the present invention as viewed from the rear;

[0041] Figure 17 This is one of the working principle diagrams of the pre-pressing mechanism of the present invention in the rearward direction;

[0042] Figure 18 This is the second working principle diagram of the pre-pressing mechanism of the present invention in the rear view direction;

[0043] Figure 19 is a side view of the second positioning mechanism of the present invention;

[0044] Figure 20 It is a rear view of the second positioning mechanism of the present invention;

[0045] Figure 21 for Figure 20 Magnified view of the D part;

[0046] Figure 22 A partially enlarged view of the positioning assembly of the present invention;

[0047] Figure 23 It is a side view of the forming mechanism of the present invention;

[0048] Figure 24 It is a rear view of the forming mechanism of the present invention;

[0049] Figure 25 for Figure 24 A magnified view of part E;

[0050] Figure 26 Schematic diagram of the working principle of the forming mechanism of the present invention;

[0051] Figure 27 It is a rear view of the welding mechanism of the present invention;

[0052] Figure 28 for Figure 27 Magnified view of part F;

[0053] Figure 29 It is a partial schematic diagram of the fourth positioning mechanism of the present invention as viewed from the rear.

[0054] In the picture:

[0055] 100-Material rack, 200-Feeding mechanism, 201-Upper transmission roller, 202-Lower transmission roller, 203-Transmission gear, 204-Power mechanism, 300-First positioning mechanism, 301-First positioning platform, 302-First positioning roller, 303-First positioning groove, 304-Transition bell mouth, 400-Pre-pressing mechanism, 401-Pre-pressing upper punch, 402-Upper pre-pressing driving mechanism, 403-Pre-pressing lower punch, 404-Arc-shaped through groove, 405-Lower pre-pressing driving mechanism, 406-Left die, 407-Right die, 408-First step, 409-Installation gap, 500-Second positioning mechanism, 501-Front positioning punch, 502-Front positioning die, 503-Rear positioning punch, 504-Rear positioning die, 505-Middle positioning assembly, 506-Roller, 507-Annular feeding Slot, 508-front positioning slot, 509-rear positioning slot, 600-forming mechanism, 601-forming upper die, 602-forming drive mechanism, 603-forming lower die, 604-lower forming slot, 605-upper forming slot, 606-second step, 607-channel, 700-third positioning mechanism, 800-welding mechanism, 801-tray, 802-welding positioning slot, 803-first row, 804-first row drive mechanism, 805-second row, 806-second row drive mechanism, 807-welding head, 808-blowing pipe, 809-clamping slot, 900-fourth positioning mechanism, 110-detection mechanism, 120-cutting mechanism, 130-sorting mechanism, 131-manipulator, 132-chuck, 141-elastic chuck, 142-clamping power mechanism, 150-machine table. DETAILED DESCRIPTION

[0056] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be understood as a limitation on the scope of protection of the present invention.

[0057] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0058] In the description of the present invention, the meaning of "several" is one or more, the meaning of "many" is more than two, and the meanings of "greater than", "less than", "exceed" and "exceed" are not inclusive of the number itself, while the meanings of "above", "below", "within" and "include" are inclusive of the number itself. If there is a description of "first" or "second", it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features. In the description of the present invention, unless otherwise clearly defined, the terms "set", "install", "connect" and "connect" should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0059] Reference Figures 5 and 6 , a production line for ultra-thin seamless metal pipes, comprising:

[0060] A material rack 100 is used to store rolled metal sheets;

[0061] The feeding mechanism 200 is used to transport the metal sheets on the rack 100 backwards;

[0062] The first positioning mechanism 300 is used to receive the metal sheet conveyed by the feeding mechanism 200 and position the metal sheet left and right and up and down;

[0063] The pre-pressing mechanism 400 is used to receive the metal sheet output from the first positioning mechanism 300 and press the cross section of the metal sheet into an arc or a broken line shape, so that the metal sheet becomes a semi-finished product;

[0064] The second positioning mechanism 500 is used to receive the semi-finished product output by the pre-pressing mechanism 400 and position the semi-finished product leftwards and rightwards and up and down;

[0065] The forming mechanism 600 is used to receive the semi-finished product output from the second positioning mechanism 500 and extrude the cross section of the semi-finished product into a closed shape;

[0066] The third positioning mechanism 700 is used to receive the semi-finished product output from the forming mechanism 600 and position the semi-finished product left and right and up and down;

[0067] The welding mechanism 800 is used to receive the semi-finished product output from the third positioning mechanism 700 and weld two edges on the side wall of the semi-finished product to each other to produce a seamless metal pipe;

[0068] A pulling mechanism for pulling the end of the seamless metal tube backward;

[0069] Also includes a fourth positioning mechanism 900 and a detection mechanism 110;

[0070] The fourth positioning mechanism 900 is used to receive the seamless metal tube output from the welding mechanism 800 and position the seamless metal tube left and right and up and down. The inspection mechanism 110 is used to receive the seamless metal tube output from the fourth positioning mechanism 900 and perform visual inspection on the weld of the seamless metal tube.

[0071] Reference Figure 5 , further comprising a control center, a cutting mechanism 120 and a sorting mechanism 130, wherein the detection mechanism 110, the sorting mechanism 130 and the pulling mechanism are all electrically connected to the control center;

[0072] The pulling mechanism is used to pull the end of the seamless metal tube output from the detection mechanism 110 backward;

[0073] The cutting mechanism 120 is used to cut the seamless metal tube between the detection mechanism 110 and the drawing mechanism to obtain an ultra-fine seamless metal tube of a certain length. The sorting mechanism 130 can sort the ultra-fine seamless metal tube into different areas according to the different results detected by the detection mechanism 110.

[0074] Reference Figure 7 and Figure 8 The feeding mechanism 200 includes an upper transmission roller 201, a lower transmission roller 202, a transmission gear 203 and a power mechanism 204. The transmission gear 203 is fixedly installed on one end of the upper transmission roller 201 or one end of the lower transmission roller 202. The power mechanism 204 is in transmission connection with the transmission gear 203 to drive the upper transmission roller 201 or the lower transmission roller 202 to rotate. A conveying channel arranged along the front-to-back direction is provided between the upper transmission roller 201 and the lower transmission roller 202. The metal sheet is provided in the conveying channel. The upper transmission roller 201 and the lower transmission roller 202 can convey the metal sheet in the conveying channel backward along the conveying channel. The upper transmission roller 201 and the lower transmission roller 202 are both spindle-shaped with a large middle part and small two ends.

[0075] Reference Figures 9 to 13 The first positioning mechanism 300 includes a first positioning platform 301 and a first positioning roller 302. The first positioning platform 301 is provided with a first positioning groove 303 with a top opening. The first positioning roller 302 is arranged on the upper side of the first positioning groove 303. The first positioning groove 303 is used to accommodate the metal sheet. The entrance end of the first positioning groove 303 is provided with a transition bell mouth 304. There are multiple first positioning rollers 302, and the positioning grooves and multiple first positioning rollers 302 are arranged in the front-to-back direction.

[0076] Reference Figures 14 to 18The pre-pressing mechanism 400 includes a pre-pressing upper punch 401, an upper pre-pressing driving mechanism 402, a pre-pressing lower punch 403, a lower pre-pressing driving mechanism 405, a left die 406 and a right die 407. The left die 406 and the right die 407 are arranged symmetrically. The left die 406 and the right die 407 are both provided with a first step 408. The first step 408 is used to place the metal sheet. The top of the pre-pressing lower punch 403 is provided with an arc-shaped through groove 404 arranged in the front-to-back direction. The vertical direction of the pre-pressing upper punch 401 is The cross-sectional line is arc-shaped, and an installation gap 409 is provided between the left die 406 and the right die 407. The upper part of the pre-pressing lower punch 403 is provided in the installation gap 409, and the pre-pressing upper punch 401 is provided on the upper side of the pre-pressing lower punch 403. The upper pre-pressing drive mechanism 402 is used to drive the pre-pressing upper punch 401 to move up and down, and the lower pre-pressing drive mechanism 405 can drive the left die 406 and the right die 407 to move up and down so that the first step 408 can be moved to the left and right sides of the pre-pressing upper punch 401.

[0077] The widths of the arc-shaped through groove 404 , the installation gap 409 , the upper pre-pressing punch and the lower pre-pressing punch gradually change along the front-to-back direction.

[0078] Reference Figures 19 to 22 The second positioning mechanism 500 includes a front positioning punch 501, a front positioning die 502, a rear positioning punch 503, a rear positioning die 504, and a middle positioning assembly 505. A front positioning groove 508 is provided between the front positioning punch 501 and the front positioning die 502. A rear positioning groove 509 is provided between the rear positioning punch 503 and the rear positioning die 504. The middle positioning assembly 505 is provided between the front positioning groove 508 and the rear positioning groove 509. The middle positioning assembly 505 includes a roller group, and the roller group includes two rollers 506 adjacent to each other on the left and right. The central axis of the roller 506 is vertically arranged, and a concave annular feeding groove 507 is provided on the side wall of the roller 506. Figure 6 The roller 506 is rotatably mounted on the machine platform 150 .

[0079] Reference Figures 23 to 26The molding mechanism 600 includes an upper molding die 601, a molding drive mechanism 602, and a lower molding die 603. The top of the lower molding die 603 is provided with a lower molding groove 604 with an arc-shaped cross-section, and the bottom of the upper molding die 601 is provided with an upper molding groove 605 with an arc-shaped cross-section. The mouth of the upper molding groove 605 is provided with a second step 606, which is adapted to and abuts against the lower molding die. The upper molding groove 605 and the lower molding groove 604 are combined into a channel 607 with a circular cross-section. The molding drive mechanism 602 is transmission-connected to the upper molding die 601 and drives the upper molding die 601 to approach or move away from the lower molding die 603.

[0080] The third positioning mechanism 700 has the same structure as the middle positioning assembly 505 .

[0081] Reference Figures 27 to 29 The welding mechanism 800 includes a tray 801, a first row 803, a first row driving mechanism 804, a second row 805, a second row driving mechanism 806, a welding head 807, a welding head driving mechanism and an air blow pipe 808. The tray 801 is provided with a welding positioning groove 802, the first row 803 and the second row 805 are arranged symmetrically on the left and right, and the first row 803 and the second row 805 are both provided with a clamping groove 809, and the clamping groove 809 is connected to the welding positioning groove 802. The first row driving mechanism 804 is used to drive the first row 803 to move left and right, the second row driving mechanism 806 is used to drive the second row 805 to move left and right, and the welding head driving mechanism is used to drive the welding head 807 to move.

[0082] Reference Figure 29 The fourth positioning mechanism 900 includes a roller group, which includes two rollers 506 adjacent to each other on the left and right. The central axis of the roller 506 is vertically arranged, and a recessed annular feeding groove 507 is provided on the upper part of the side wall of the roller 506.

[0083] The pulling mechanism includes a tensioning clamp 141 and a clamping power mechanism 142. The tensioning clamp 141 is used to clamp the seamless metal tube. The clamping power mechanism 142 is used to drive the tensioning clamp 141 to clamp or release the seamless metal tube. When the tensioning clamp 141 clamps the seamless metal tube, the clamping power mechanism 142 pulls the seamless metal tube backward for a certain distance, and then the clamp 141 releases the seamless metal tube, and the clamping power mechanism 142 drives the clamp 141 to move forward a certain distance to reset.

[0084] Reference Figure 5 and Figure 6 , the cutting mechanism 120 is a circular knife or a laser cutting device.

[0085] Reference Figure 5 and Figure 6 The sorting mechanism 130 includes a manipulator 131 and a chuck 132 provided at the end of the manipulator 131, and the chuck 132 is used to clamp the ultra-fine seamless metal tube.

[0086] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made based on the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A production line for ultra-fine seamless metal tubes, characterized in that: include: A material rack (100) for storing rolled metal sheets; A first positioning mechanism (300) is used to receive the metal sheet output from the material rack (100) and position the metal sheet leftwards and rightwards and up and down; A pre-pressing mechanism (400) is used to receive the metal sheet output from the first positioning mechanism (300) and press the cross section of the metal sheet into an arc or a broken line shape, so that the metal sheet becomes a semi-finished product; A second positioning mechanism (500) is used to receive the semi-finished product output by the pre-pressing mechanism (400) and to position the semi-finished product leftwards and rightwards and up and down; a forming mechanism (600) for receiving the semi-finished product output from the second positioning mechanism (500) and extruding the cross section of the semi-finished product into a closed shape; a third positioning mechanism (700) for receiving the semi-finished product output from the forming mechanism (600) and positioning the semi-finished product in the left-right and up-down directions; a welding mechanism (800) for receiving the semi-finished product outputted from the third positioning mechanism (700) and for welding two edges on the side wall of the semi-finished product to each other to produce a seamless metal pipe; A pulling mechanism for pulling the end of the seamless metal tube backward; The second positioning mechanism (500) includes a front positioning punch (501), a front positioning die (502), a rear positioning punch (503), a rear positioning die (504), and a middle positioning assembly (505); a front positioning groove (508) is provided between the front positioning punch (501) and the front positioning die (502); a rear positioning groove (509) is provided between the rear positioning punch (503) and the rear positioning die (504); the middle positioning assembly (505) is provided between the front positioning groove (508) and the rear positioning groove (509); the middle positioning assembly (505) includes a roller group, the roller group includes two rollers (506) adjacent to each other on the left and right; the central axis of the roller (506) is vertically arranged; and a concave annular feeding groove (507) is provided on the side wall of the roller (506).

2. The production line for ultra-thin seamless metal tubes according to claim 1, characterized in that: It also includes a feeding mechanism (200) for pulling the metal sheet on the material rack (100) and conveying the metal sheet backward to the first positioning mechanism (300); It also includes a fourth positioning mechanism (900) and a detection mechanism (110); The fourth positioning mechanism (900) is used to receive the seamless metal tube output from the welding mechanism (800) and position the seamless metal tube left and right and up and down. The inspection mechanism (110) is used to receive the seamless metal tube output from the fourth positioning mechanism (900) and perform visual inspection on the weld of the seamless metal tube.

3. The production line for ultra-thin seamless metal tubes according to claim 2, characterized in that: It also includes a control center, a cutting mechanism (120) and a sorting mechanism (130), wherein the detection mechanism (110), the sorting mechanism (130) and the material pulling mechanism are all electrically connected to the control center; The cutting mechanism (120) is used to cut the seamless metal tube between the detection mechanism (110) and the drawing mechanism to obtain ultra-fine seamless metal tubes of a certain length, and the sorting mechanism (130) can sort the ultra-fine seamless metal tubes into different areas according to different results detected by the detection mechanism (110).

4. A production line for ultra-thin seamless metal tubes according to any one of claims 2 to 3, characterized in that: The feeding mechanism (200) comprises an upper transmission roller (201), a lower transmission roller (202), a transmission gear (203) and a power mechanism (204); the transmission gear (203) is fixedly mounted on one end of the upper transmission roller (201) or one end of the lower transmission roller (202); the power mechanism (204) is in transmission connection with the transmission gear (203) to drive the upper transmission roller (201) or the lower transmission roller (202) to rotate; a transmission channel arranged in a front-to-back direction is provided between the upper transmission roller (201) and the lower transmission roller (202); the metal sheet is provided in the transmission channel; the upper transmission roller (201) and the lower transmission roller (202) are capable of transmitting the metal sheet in the transmission channel backward along the transmission channel; the upper transmission roller (201) and the lower transmission roller (202) are both spindle-shaped with a large middle portion and small ends.

5. A production line for ultra-thin seamless metal tubes according to any one of claims 1 to 3, characterized in that: The first positioning mechanism (300) comprises a first positioning platform (301) and a first positioning roller (302); the first positioning platform (301) is provided with a first positioning groove (303) with a top opening; the first positioning roller (302) is arranged on the upper side of the first positioning groove (303); the first positioning groove (303) is used to accommodate the metal sheet; a transition bell mouth (304) is provided at the entrance end of the first positioning groove (303); there are multiple first positioning rollers (302); the positioning grooves and the multiple first positioning rollers (302) are arranged in a front-to-back direction.

6. A production line for ultra-thin seamless metal tubes according to any one of claims 1 to 3, characterized in that: The pre-pressing mechanism (400) comprises a pre-pressing upper punch (401), an upper pre-pressing driving mechanism (402), a pre-pressing lower punch (403), a lower pre-pressing driving mechanism (405), a left die (406) and a right die (407), wherein the left die (406) and the right die (407) are symmetrically arranged on the left and right sides, and the left die (406) and the right die (407) are both provided with a first step (408), and the first step (408) is used to place the metal sheet, the top of the pre-pressing lower punch (403) is provided with an arc-shaped through groove (404) arranged in the front-back direction, and the top of the pre-pressing upper punch (401) is provided with a first step (408) arranged in the front-back direction. The vertical cross-section line is arc-shaped, and an installation gap (409) is provided between the left die (406) and the right die (407). The upper part of the pre-pressing lower punch (403) is provided in the installation gap (409), and the pre-pressing upper punch (401) is provided on the upper side of the pre-pressing lower punch (403). The upper pre-pressing driving mechanism (402) is used to drive the pre-pressing upper punch (401) to move up and down, and the lower pre-pressing driving mechanism (405) can drive the left die (406) and the right die (407) to move up and down so that the first step (408) can be moved to the left and right sides of the pre-pressing upper punch (401).

7. The production line for ultra-thin seamless metal tubes according to claim 6, characterized in that: The widths of the arc-shaped through groove (404), the installation gap (409), the upper pre-pressing punch (401) and the lower pre-pressing punch (403) gradually change along the front-to-back direction.

8. A production line for ultra-thin seamless metal tubes according to any one of claims 1 to 3, characterized in that: The molding mechanism (600) comprises an upper molding die (601), a molding drive mechanism (602), and a lower molding die (603). The top of the lower molding die (603) is provided with a lower molding groove (604) with an arc-shaped cross section. The bottom of the upper molding die (601) is provided with an upper molding groove (605) with an arc-shaped cross section. The mouth of the upper molding groove (605) is provided with a second step (606). The second step (606) is adapted to and abuts against the lower molding die (603). The upper molding groove (605) and the lower molding groove (604) are combined into a channel (607) with a circular cross section. The molding drive mechanism (602) is transmission-connected to the upper molding die (601) and drives the upper molding die (601) to approach or move away from the lower molding die (603).

9. A production line for ultra-thin seamless metal tubes according to any one of claims 1 to 3, characterized in that: The third positioning mechanism (700) is consistent in structure with the middle positioning assembly (505).

10. A production line for ultra-thin seamless metal tubes according to any one of claims 1 to 3, characterized in that: The welding mechanism (800) comprises a tray (801), a first row (803), a first row driving mechanism (804), a second row (805), a second row driving mechanism (806), a welding head (807), a welding head driving mechanism and an air blow pipe (808); the tray (801) is provided with a welding positioning groove (802); the first row (803) and the second row (805) are arranged symmetrically on the left and right; the first row (803) and the second row (805) are both provided with a clamping groove (809); the clamping groove (809) is connected to the welding positioning groove (802); the first row driving mechanism (804) is used to drive the first row (803) to move left and right; the second row driving mechanism (806) is used to drive the second row (805) to move left and right; and the welding head driving mechanism is used to drive the welding head (807) to move.

11. The production line for ultra-thin seamless metal tubes according to claim 2, characterized in that: The fourth positioning mechanism (900) includes a roller group, which includes two rollers (506) adjacent to each other on the left and right. The central axis of the roller (506) is vertically arranged, and a recessed annular feeding groove (507) is provided on the upper part of the side wall of the roller (506).

12. The production line for ultra-thin seamless metal tubes according to claim 3, characterized in that: The material pulling mechanism comprises a loose clamp (141) and a clamping power mechanism (142), wherein the loose clamp (141) is used for clamping the seamless metal pipe, and the clamping power mechanism (142) is used for driving the loose clamp (141) to clamp or release the seamless metal pipe.

13. The production line for ultra-thin seamless metal tubes according to claim 3, characterized in that: The cutting mechanism (120) is a circular knife or a laser cutting device.

14. The production line for ultra-thin seamless metal tubes according to claim 3, characterized in that: The sorting mechanism (130) comprises a manipulator (131) and a clamp (132) provided at the end of the manipulator (131), wherein the clamp (132) is used for clamping the ultra-fine seamless metal tube.

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