Steel plate bending and welding pipe preparation system and preparation method

Abstract

The application provides a steel plate bending and welding pipe preparation system, which comprises a feeding conveying device, a milling device, a bending forming device and a joint welding device. The application also provides a steel plate bending and welding pipe preparation method, which comprises the following steps: feeding a steel plate through the feeding conveying device and passing the steel plate through a passing slot of the milling device; simultaneously milling edges of opposite two side edges of the steel plate by a milling cutter of the milling device; cooperating a beam bending mechanism and a side pushing mechanism of the rear bending forming device to press and gradually bend the steel plate into a cylindrical to-be-welded steel pipe; S4, welding and shaping the joint after joint welding by the joint welding device to obtain a finished steel pipe. The device and the method can realize the functions of automatically feeding the steel plate, automatically milling the edges, pushing, bending, pushing out and feeding into the pipe preparation equipment, and have high automation degree. The whole curling process is completed by the same beam bending mechanism, which greatly simplifies the production process and the production equipment, and the device has simple overall structure, is convenient to maintain and has low production cost.

Description

TECHNICAL FIELD

[0001] The present application relates to a production system of welded steel pipe, in particular to a steel plate bending and welding pipe preparation system and a preparation method. BACKGROUND

[0002] The prior art welding steel pipe manufacturing process is generally to bend and curl the steel plate into a cylindrical shape and then to joint weld the two edges of the steel plate to obtain a steel pipe. The steel plate bending or curling process usually uses a roller press to repeatedly press the steel plate to bend it into a tubular shape. First, a few groups of roller presses are used to press the edges of the steel plate to bend them upward, and then a few groups of roller presses are used to press the main body of the steel plate to gradually bend it into a tubular shape. This process requires multiple groups of roller presses and a large number of auxiliary equipment, and the production process is relatively complicated. The machine set is large, and maintenance and replacement are time-consuming and labor-intensive. For the production of steel pipes with thick walls, the wear of the roller presses will be great, and the production cost will be high. When welding thick steel plates, it is necessary to ensure that the weld is fully penetrated, uniform and firm. Before welding, a certain bevel is milled on the edge of the steel plate to form a certain angle and depth of the weld groove after the steel plate is bent. The traditional production process is basically a single process, which requires independent milling of the edge of the steel plate, hoisting into a bending machine for bending, and finally hoisting into a pipe making device for completion. The weight of large-diameter thick pipes is extremely large, and many auxiliary equipment needs to be used. The production process is relatively complicated, and the production efficiency is low. SUMMARY

[0003] The purpose of the present application is to provide a steel plate bending and welding pipe preparation system and a preparation method which can realize automatic production, simple production process and high production efficiency.

[0004] According to one aspect of the present application, a steel plate bending and welding pipe preparation system is provided, comprising a feeding conveying device, a milling edge device, a bending forming device and a joint welding device. The feeding conveying device is provided with a plurality of conveying rollers. The milling edge device is embedded between two conveying rollers. The input end of the bending forming device is connected to the output end of the feeding conveying device. The feeding conveying device is used to convey the steel plate after milling the edge by the milling edge device to the bending forming device. The input end of the joint welding device is connected to the output end of the bending forming device. The bending forming device is used to press the steel plate into a cylindrical shape and then convey it to the joint welding device. The joint welding device is used to joint weld the two edges of the pressed steel plate to form a steel pipe.

[0005] Further, the edge milling device comprises an edge milling base, two sets of opposite limiting racks, slide rails, a rack adjusting mechanism, an upper pressing wheel set, an upper pressing wheel set adjusting mechanism, a lower pressing wheel set, side wheels and an edge milling mechanism. The slide rails and the rack adjusting mechanism are fixed to the upper side of the edge milling base. The lower end of the limiting rack is in sliding connection with the slide rail. The rack adjusting mechanism is connected with the limiting rack and can drive the limiting rack to move along the slide rail. The upper pressing wheel set adjusting mechanism is fixed to the upper part of the limiting rack. The upper pressing wheel set adjusting mechanism is connected with the upper pressing wheel set and can drive the upper pressing wheel set to move up and down. The lower pressing wheel set is fixed to the limiting rack and is located below the upper pressing wheel set. The side wheels are arranged in two and are respectively fixed to the two ends of the limiting rack. The limiting rack is provided with a horizontal through material passing groove. The material passing groove passes through between the upper pressing wheel set and the lower pressing wheel set. The side wheels are correspondingly arranged with the material passing groove.

[0006] Further, the edge milling mechanism comprises a milling cutter, a milling cutter seat, an adjustable rack, a horizontal adjusting mechanism, a milling cutter motor mounting seat, a vertical adjusting mechanism, a milling cutter motor and a rotating shaft. The adjustable rack is in sliding connection with the milling cutter seat. The horizontal adjusting mechanism is mounted on the milling cutter seat. The horizontal adjusting mechanism is connected with the adjustable rack and can drive the adjustable rack to move horizontally. The milling cutter motor mounting seat is in sliding connection with the adjustable rack. The vertical adjusting mechanism is mounted on the adjustable rack. The vertical adjusting mechanism is connected with the milling cutter motor mounting seat and can drive the milling cutter motor mounting seat to move vertically. The milling cutter motor is fixed to the milling cutter motor mounting seat. The milling cutter is fixed to the output end of the milling cutter motor through the rotating shaft. The milling cutter is located beside the lower pressing wheel set.

[0007] Further, the bending forming device comprises a beam type bending mechanism, a first side pushing mechanism, a conveying mechanism, a pushing out mechanism and a second side pushing mechanism. The first side pushing mechanism and the second side pushing mechanism are respectively located on the two sides of the beam type bending mechanism. The conveying mechanism is located on one side of the beam type bending mechanism and is embedded with the first side pushing mechanism. The pushing out mechanism is located at one end of the beam type bending mechanism. The beam type bending mechanism comprises a stand, a fixed beam, a hydraulic cylinder, a movable beam, an upper die seat and a lower die seat. The stand is arranged in two and is respectively fixed to the two ends of the fixed beam. The hydraulic cylinder is fixed to the fixed beam. The movable beam is located below the fixed beam. The output end of the hydraulic cylinder is connected with and can drive the movable beam to move up and down. The two ends of the movable beam are respectively in sliding connection with the stand. The upper die seat is fixed to the movable beam. The lower die seat is located below the upper die seat. The lower die seat is provided with a concave die penetrating through the upper end of the lower die seat. The lower end of the upper die seat is provided with a long strip-shaped convex die. The shape of the convex die matches the concave die.

[0008] Further, the first side pushing mechanism comprises a base, a guide rail, a sliding block seat, a side pushing plate, a screw rod, a motor and a transmission mechanism, the guide rail is fixed to the upper side of the base, the lower side of the sliding block seat is in sliding connection with the guide rail, the side pushing plate is fixed to the upper side of the sliding block seat, the screw rod penetrates and is in threaded connection, the motor is fixedly arranged, and the motor is connected with the screw rod through the transmission mechanism and can drive the screw rod to rotate.

[0009] Further, the joint welding device comprises a feeding conveying mechanism, a first joint roller pressing mechanism, a side pressing mechanism, a second joint roller pressing mechanism, a downward joint pressing mechanism, a traction mechanism, a straightening mechanism and a welding gun, the feeding conveying mechanism, the first joint roller pressing mechanism, the side pressing mechanism, the second joint roller pressing mechanism, the downward joint pressing mechanism, the traction mechanism and the straightening mechanism are arranged in sequence, the first joint roller pressing mechanism, the second joint roller pressing mechanism and the downward joint pressing mechanism all adopt horizontal roller pressing structures in an upper-lower structure, the side pressing mechanism adopts a vertical roller pressing structure in a left-right structure, and the welding gun is located at the output end of the downward joint pressing mechanism.

[0010] Further, the first joint roller pressing mechanism comprises a vertical plate support, a lower shaft, a lower die, an upper shaft sleeve, an upper shaft, an upper die and an upper shaft lifting oil cylinder, the end of the lower shaft penetrates the vertical plate support and is in rotary connection with the vertical plate support, the lower die is sleeved outside the lower shaft and is fixedly connected with the lower shaft, the upper shaft sleeve is in sliding connection with the vertical plate support, the end of the upper shaft is in rotary connection with the upper shaft sleeve, the upper die is sleeved outside the upper shaft sleeve and is fixedly connected with the upper shaft sleeve, the upper shaft lifting oil cylinder is fixed to the vertical plate support, and the extension end of the upper shaft lifting oil cylinder is fixedly connected with the upper shaft sleeve and can drive the upper shaft sleeve to move up and down.

[0011] According to one aspect of the present application, a steel plate bending and welding pipe preparation method is provided, comprising the following steps:

[0012] S1, the steel plate is conveyed through the feeding conveying device and passes through the passing slot of the edge milling device;

[0013] S2, when the steel plate passes through the passing slot of the edge milling device, the milling cutter of the edge milling device simultaneously mills the edges of the opposite two side edges of the steel plate;

[0014] S3, the milled steel plate is conveyed to the bending forming device, and the beam type bending mechanism of the bending forming device cooperates with the first side pushing mechanism and the second side pushing mechanism to press and gradually bend the steel plate into a cylindrical to-be-welded steel pipe;

[0015] S4, the to-be-welded steel pipe is conveyed to the joint welding device for joint welding after welding and shaping to obtain a finished steel pipe.

[0016] The above step S3 further comprises the following steps:

[0017] S3-1, the steel plate is conveyed to the conveying mechanism from one side of the beam bending mechanism, and the first side pushing mechanism pushes the edge of the steel plate in contact with the first side pushing mechanism to the convex die and the concave die of the beam bending mechanism;

[0018] S3-2, the hydraulic cylinder drives the movable beam to move downward, so that the upper die holder moves downward and drives the convex die to move downward, and the steel plate is pressed along the edge of the steel plate to press a small section of the upward bending arc surface;

[0019] S3-3, the rear hydraulic cylinder drives the convex die to move upward, the second side pushing mechanism pushes the other edge of the steel plate to a small distance, and the convex die is pressed again, and another arc surface connected with the previous arc surface is pressed;

[0020] S3-4, repeating step S3-3, when the steel plate is gradually pressed from one edge to the center position of the steel plate, the hydraulic cylinder drives the convex die to lift and pause, the second side pushing mechanism pushes the other edge of the steel plate to the lower side of the convex die, and then gradually presses from the other edge of the steel plate to the center position of the steel plate, and the convex die stops pressing, so that the whole steel plate is curled into a cylindrical shape of the steel pipe to be welded, and the rear pushing mechanism is started to push out the steel pipe to be welded.

[0021] The above step S4 further comprises the following steps:

[0022] S4-1, the steel pipe to be welded is input into the first joint roller pressing mechanism through the feeding conveying mechanism and passes between the upper die and the lower die, and the pressure of the upper die and the lower die makes the two edges of the steel pipe to be welded close to the two sides of the convex ring;

[0023] S4-2, after being closed by the first joint roller pressing mechanism, it enters the side pressing mechanism for side pressing;

[0024] S4-3, the steel pipe to be welded enters the second joint roller pressing mechanism after being side-pressed by the side pressing mechanism, so that the two side edges of the steel pipe to be welded are further closed;

[0025] S4-4, after being closed by the second joint roller pressing mechanism, the steel pipe to be welded enters the lower joint pressing mechanism for lower pressing, so that the two edges of the steel pipe to be welded are completely closed and then welded;

[0026] S4-5, the welded steel pipe is pulled to the two straightening mechanisms by the pulling mechanism, and then is output by the output mechanism.

[0027] The beneficial effects of the present application are:

[0028] 1. It has the functions of automatic steel plate feeding, automatic edge milling, pushing, bending, pushing out and pipe making equipment, and the degree of automation is high.

[0029] 2. The whole curling process is completed by the same beam bending mechanism, the bulky and numerous roller mechanisms in the prior art are cancelled, the production process and production equipment are greatly simplified, the overall structure of the device is simple, easy to maintain and low in production cost.

[0030] 3. By replacing the end orthopedic mold, various shapes of steel pipes, including square, round or other shaped pipes, can be produced, and the application range is wide. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a structure schematic view of a steel plate bending and welded pipe preparation system of an embodiment of the present application;

[0032] Figure 2 It is a structure schematic view of a milling edge device;

[0033] Figure 3 It is a top view structure schematic view of the milling edge device;

[0034] Figure 4 It is a sectional view structure schematic view of the milling edge device;

[0035] Figure 5 It is a right view structure schematic view of the milling edge device;

[0036] Figure 6 It is a structure schematic view of a bending forming device;

[0037] Figure 7 It is a structure schematic view of a beam bending mechanism;

[0038] Figure 8 It is a structure schematic view of a side pushing mechanism;

[0039] Figure 9 It is a structure schematic view of a conveying mechanism;

[0040] Figure 10 It is a structure schematic view of the cooperation of the side pushing mechanism and the conveying mechanism;

[0041] Figure 11 It is a structure schematic view of a pushing-out mechanism;

[0042] Figure 12 It is a structure schematic view of a joint welding device;

[0043] Figure 13 It is a structure schematic view of a first joint roller mechanism;

[0044] Figure 14 It is a structure schematic view of a side pressing mechanism;

[0045] Figure 15 It is a structure schematic view of a joint pressing mechanism;

[0046] Figure 16 Structure diagram of traction mechanism;

[0047] In the figure: feed conveying device-1, edge milling device-2, edge milling base-21, limiting frame-22, material passing groove-221, slide rail-23, frame adjusting mechanism-24, upper pressing wheel set-25, upper pressing wheel set adjusting mechanism-26, lower pressing wheel set-27, side wheel-28, edge milling mechanism-29, milling cutter-291, milling cutter machine base-292, adjustable frame-293, horizontal adjusting mechanism-294, milling cutter motor mounting seat-295, sliding groove seat-2951, mounting disc-2952, rotating shaft mounting cylinder-2953, mounting hole-2954, vertical adjusting mechanism-296, milling cutter motor-297, bending forming device-3, beam type bending mechanism-31, stand-311, sliding groove-3111, fixed beam-312, hydraulic cylinder-313, movable beam-314, sliding block-3141, upper die base-315, lower die base-316, male die-317, female die-318, first side pushing mechanism-32, base-321, guide rail-322, sliding block seat-323, screw matching block-3231, side pushing plate-324, screw-325, motor-326, transmission mechanism-327, conveying mechanism-33, conveying support-331, conveying motor-332, conveying shaft-333, conveying roller-334, pushing out mechanism-34, pushing out cylinder-341, pushing out frame-342, pushing plate-343, second side pushing mechanism-35, joint welding device-4, feed conveying mechanism-41, transmission chain-411, side limiting roller-412, first joint roller pressing mechanism-42, standing board support-421, lower shaft-422, lower die-423, upper shaft sleeve-424, upper shaft-425, upper die-426, directional convex ring-4261, upper shaft lifting oil cylinder-427, side pressing mechanism-43, side pressing frame-431, side pressing lifting mechanism-432, oil cylinder mounting seat-433, side pressing oil cylinder-434, side pressing shaft-435, pin shaft mounting seat-436, pin shaft-437, side pressing die-438, second joint roller pressing mechanism-44, joint pressing mechanism-45, joint pressing gantry-451, joint pressing oil cylinder-452, joint pressing die mounting seat-453, joint pressing die-454, standing die mounting seat-455, standing die-456, traction mechanism-46, straightening mechanism-47, straightening mechanism base-471, longitudinal sliding plate-472, longitudinal sliding plate pressing strip-473, transverse sliding plate-474, transverse sliding plate pressing strip-475, lifting adjusting mechanism-476, horizontal adjusting mechanism-477, straightening pressing die mechanism-478, roller die mounting seat-4781, lifting adjuster-4782, roller die box-783, roller die shaft-4784, material passing hole-479, output mechanism-48. DETAILED DESCRIPTION

[0048] The application will be further described in detail below with reference to the drawings.

[0049] Embodiment 1

[0050] Figures 1-16 A steel plate bending and welding pipe preparation system according to an embodiment of the present application is schematically shown.

[0051] With reference to Figures 1-16 , the steel plate bending and welding pipe preparation system comprises a feeding conveying device 1, a milling edge device 2, a bending forming device 3 and a joint welding device 4. The feeding conveying device 1 is provided with a plurality of conveying rollers 11 and a feeding conveying motor 12, the milling edge device 2 is embedded between two conveying rollers 11, and the feeding conveying motor 12 is connected with the conveying rollers 11 through a transmission mechanism and drives the conveying rollers 11 to rotate to convey the steel plate. The input end of the bending forming device 3 is connected with the output end of the feeding conveying device 1, the feeding conveying device 1 is used to convey the steel plate after milling edge by the milling edge device 2 to the bending forming device 3, the input end of the joint welding device 4 is connected with the output end of the bending forming device 3, the bending forming device 3 is used to press the steel plate into a cylindrical shape and then convey it to the joint welding device 4, and the joint welding device 4 is used to joint and weld the two edges of the pressed steel plate to form a steel pipe.

[0052] With reference to Figures 2-5 , the milling edge device 2 comprises a milling edge base 21 and two sets of oppositely arranged limiting racks 22, slide rails 23, rack adjusting mechanisms 24, upper pressing wheel sets 25, upper pressing wheel set adjusting mechanisms 26, lower pressing wheel sets 27, side wheels 28 and milling edge mechanisms 29. The slide rails 23 and the rack adjusting mechanisms 24 are fixed to the upper side of the milling edge base 21, the lower end of the limiting rack 22 is slidably connected with the slide rail 23, and the lower end of the limiting rack 22 cooperates with the slide groove of the slide rail 23. The rack adjusting mechanism 24 is connected with the limiting rack 22 and can drive the limiting rack 22 to move along the slide rail 23, and the rack adjusting mechanism 24 can adopt a structure that a screw rod penetrates through the bottom of the limiting rack 22 and threadedly cooperates with the limiting rack 22 to adjust the position of the limiting rack 22. The upper pressing wheel set adjusting mechanism 26 is fixed to the upper part of the limiting rack 22, and the upper pressing wheel set adjusting mechanism 26 is connected with the upper pressing wheel set 25 and can drive the upper pressing wheel set 25 to move up and down. The lower pressing wheel set 27 is fixed to the limiting rack 22 and located below the upper pressing wheel set 25, and the side wheel 28 is provided with two and fixed to the two ends of the limiting rack 22. Each limiting rack 22 is provided with two side wheels 28, and the four side wheels 28 of the two limiting racks 22 are oppositely arranged at the input end and the output end of the device respectively to limit the edges of the steel plate.

[0053] The upper pressing wheel set 25 comprises an upper pressing support and upper pressing rollers, both ends of the support are slidingly connected with the limiting frame 22, and a plurality of upper pressing rollers are arranged side by side on one side of the support. The upper pressing wheel set adjusting mechanism 26 is connected with the upper pressing support and can drive the upper pressing support to move up and down. The upper pressing wheel set adjusting mechanism 26 can adopt an adjusting mechanism of the prior art, for example, a screw rod is used to adjust to a suitable position and then a jacking screw is used for fixing. The lower pressing wheel set 27 is provided with a plurality of lower pressing rollers, and the lower pressing rollers are arranged one by one corresponding to the upper pressing rollers.

[0054] The limiting frame 22 is provided with a horizontal through material passing groove 20, the material passing groove 20 passes through between the upper pressing wheel set 25 and the lower pressing wheel set 27, and the side wheels 28 are arranged corresponding to the material passing groove 20 and are respectively located at both ends of the material passing groove 20. When the steel plate is input, it first passes between the two opposite side wheels 28 at one end of the two limiting frames 22, then enters the material passing groove 20, and then passes between the upper pressing wheel set 25 and the lower pressing wheel set 27, and then passes out between the two side wheels 28 at the other end of the two limiting frames 22.

[0055] The edge milling mechanism 29 comprises a milling cutter 291, a milling cutter seat 292, an adjustable frame 293, a horizontal adjusting mechanism 294, a milling cutter motor mounting seat 295, a vertical adjusting mechanism 296, a milling cutter motor 297 and a rotating shaft. The milling cutter seat 292 is fixedly arranged beside the edge milling base 21, the bottom of the adjustable frame 293 is slidingly connected with the upper part of the milling cutter seat 292, and the sliding connection can adopt the cooperation connection of a sliding block and a sliding groove in the prior art. The horizontal adjusting mechanism 294 is installed on the milling cutter seat 292, the horizontal adjusting mechanism 294 is connected with the adjustable frame 293 and can drive the adjustable frame 293 to move horizontally. The milling cutter motor mounting seat 295 is in sliding connection with the adjustable frame 293, the vertical adjusting mechanism 296 is installed on the adjustable frame 293, the vertical adjusting mechanism 296 is connected with the milling cutter motor mounting seat 295 and can drive the milling cutter motor mounting seat 295 to move vertically. The milling cutter motor 297 is fixed to the milling cutter motor mounting seat 295, and the milling cutter 291 is fixed to the output end of the milling cutter motor 297 through the rotating shaft. The milling cutter 291 is located beside the upper pressing wheel set 25 and the lower pressing wheel set 27, and mills the edge of the steel plate when the steel plate passes between the upper pressing wheel set 25 and the lower pressing wheel set 27. The horizontal adjusting mechanism 294 and the vertical adjusting mechanism 296 can adopt adjusting mechanisms of the prior art, and after the milling cutter motor mounting seat 295 is adjusted to the required position through the horizontal adjusting mechanism 294 and the vertical adjusting mechanism 296, a screw can be used for jacking and fixing.

[0056] The milling cutter motor mounting seat 295 comprises a sliding groove seat 2951, a mounting disc 2952 and a rotating shaft mounting cylinder 2953. The sliding groove seat 2951 is slidingly connected with the adjustable rack 293, and the vertical adjusting mechanism 296 is connected with the sliding groove seat 2951 and can drive the up and down movement. One side of the mounting disc 2952 is detachably fixedly connected with one side of the sliding groove seat 2951 through screws, and the other side of the mounting disc 2952 is fixedly connected with the rotating shaft mounting cylinder 2953. The mounting disc 2952 is provided with a plurality of arc-shaped mounting holes 2954 distributed in a ring shape, and the mounting disc 2952 is fixedly connected with the sliding groove seat 2951 by penetrating the mounting holes 2954 and the sliding groove seat 2951 with screws. The arc-shaped mounting holes 2954 can facilitate the adjustment of the installation angle of the milling cutter 291, so that the milling cutter 291 can adapt to the milling of steel plates of different specifications.

[0057] The milling cutter motor 297 is fixed to one end of the rotating shaft mounting cylinder 2953, the rotating shaft penetrates through the rotating shaft mounting cylinder 2953 and is rotationally connected with the rotating shaft mounting cylinder 2953. The milling cutter motor 297 can drive the rotating shaft to rotate and drive the milling cutter 291 to rotate.

[0058] The edge milling device 2 is provided with side wheels 28 on both sides of the limiting rack 22 to position the two side edges of the steel plate, and is provided with an upper pressing wheel set 25 and a lower pressing wheel set 27 to clamp and press the steel plate to ensure that the steel plate does not sway up, down, left and right during operation. And by setting the fixed edge milling mechanism 29 on both sides of the limiting rack 22, the two side edges of the steel plate are milled during the process of the steel plate passing through the limiting rack. No manual positioning is required, and the production is automated and efficient. The distance between the two limiting racks is adjusted by the rack adjusting mechanism, and the position and angle of the milling cutter are adjusted by the horizontal adjusting mechanism 294 and the vertical adjusting mechanism 296 of the edge milling mechanism 29 and the mounting disc 2952, so that steel plates of different specifications and thicknesses can be milled.

[0059] Referring to Figures 6-11 , the bending forming device 3 comprises a beam bending mechanism 31, a first side pushing mechanism 32, a conveying mechanism 33, a pushing-out mechanism 34 and a second side pushing mechanism 35. The first side pushing mechanism 32 and the second side pushing mechanism 35 are respectively located on both sides of the beam bending mechanism 31, the conveying mechanism 33 is located on one side of the beam bending mechanism 31 and is embedded with the first side pushing mechanism 32, and the pushing-out mechanism 34 corresponds to one end of the beam bending mechanism 31. The steel plate enters from one side of the conveying mechanism, is pushed into the beam bending mechanism 31 by the cooperation of the first side pushing mechanism 32 and the second side pushing mechanism 35 to be pressed into the shape of a steel pipe, and after the pressing is completed, it is pushed out by the pushing-out mechanism and enters the next process for joint welding.

[0060] Referring to Figure 7The beam bending mechanism 31 comprises a stand 311, a fixed beam 312, a hydraulic cylinder 313, a movable beam 314, an upper die seat 315 and a lower die seat 316. The stand 311 is provided in two, and the top ends of the two stands 311 are fixedly connected with the two ends of the fixed beam 312. The hydraulic cylinder 313 is fixed to the fixed beam 312, and the movable beam 314 is located below the fixed beam. The output end of the hydraulic cylinder 313 is connected with and can drive the movable beam 314 to move up and down. The two ends of the movable beam 314 are slidably connected with the stands 311, and the two ends of the movable beam 314 are each provided with a sliding block 3141. The stand 311 is provided with a vertical sliding groove 3111, and the sliding block 3141 is slidably connected with the sliding groove 3111. The upper die seat 315 is fixed to the lower end of the movable beam 314, and the lower die seat 316 is fixedly arranged below the upper die seat 315.

[0061] The lower die seat 316 and the upper die seat 315 are both long strips. The lower die seat 316 is provided with a concave die 318 penetrating through the upper end of the lower die seat 316, and the lower end of the upper die seat 315 is provided with a long strip-shaped convex die 317. The shape of the convex die 317 matches the concave die 318, and the cross section of the matching surface of the convex die 317 and the concave die 318 is a concave circular arc, and the bending radius is consistent with the bending radius of the steel pipe to be pressed.

[0062] Referring to Figure 8 and Figure 10 , the first side pushing mechanism 32 comprises a base 321, a guide rail 322, a sliding block seat 323, a side pushing plate 324, a screw rod 325, a motor 326 and a transmission mechanism 327. The guide rail 322 is fixed to the upper side of the base 321, the lower side of the sliding block seat 323 is slidably connected with the guide rail 322 through a sliding groove arranged on the lower side of the sliding block seat 323, and the side pushing plate 324 is fixed to the upper side of the sliding block seat 323. The lower side of the sliding block seat 323 is further provided with a screw rod matching block 3231, and the screw rod 325 penetrates through the screw rod matching block 3231 and is threadedly matched with the screw rod matching block 3231. The motor 326 is fixedly arranged, and the motor 326 is connected with the screw rod 325 through the transmission mechanism 327 and can drive the screw rod 325 to rotate. The rotation of the screw rod 325 can drive the sliding block seat 323 to move along the guide rail 322 and drive the side pushing plate 324 to move. The base 321, the sliding block seat 323 and the screw rod 325 are all provided in two. Two guide rails 322 are arranged on each base 321 to support the two ends of the sliding block seat 323, and the screw rod 325 is located between the two guide rails 322. The motor 326 is provided in one, and is connected with the two screw rods 325 through the transmission mechanism 327 and drives the two screw rods 325 to synchronously operate. The two sliding block seats 323 are arranged at the two ends of the side pushing plate 324 respectively. The structure of the second side pushing mechanism 35 is the same as that of the first side pushing mechanism 32.

[0063] Referring to Figure 9 and Figure 10The conveying mechanism 33 comprises a conveying bracket 331, a conveying motor 332, a conveying shaft 333 and a conveying roller 334. The conveying motor 332 is fixed to the conveying bracket 331, the output end of the conveying motor 332 is connected with one end of the conveying shaft 333 and can drive the conveying shaft 333 to rotate, and the conveying roller 334 is sleeved on the conveying shaft 333 and is fixedly connected with the conveying shaft 333. The conveying bracket 331, the conveying shaft 333 and the conveying roller 334 are arranged in multiple groups and are located between the two bases 321, and are used for supporting and conveying the steel plate when the steel plate is conveyed into the device.

[0064] With reference to Figure 11 The pushing-out mechanism 34 comprises a pushing-out cylinder 341, a pushing-out bracket 342 and a pushing plate 343. The pushing-out cylinder 341 is fixedly arranged, the telescopic end of the pushing-out cylinder 341 is fixedly connected with one end of the pushing-out bracket 342, and the other end of the pushing-out bracket 342 is fixedly connected with the pushing plate 343. The pushing-out bracket 342 is horizontally arranged in a U shape and comprises a bottom end and two cantilever ends, the output end of the pushing-out cylinder 341 is fixedly connected with the middle part of the bottom end of the pushing-out bracket 342, and the pushing plate 343 is arranged in two pieces and is fixedly arranged at the top ends of the two cantilever ends, respectively. The two pushing plates 343 correspond to the two sides of the upper die seat 315, respectively. When the steel plate is pressed and formed, the two pushing plates 343 push the one end of the steel plate curled on the two sides of the upper die seat 315 from the two sides of the upper die seat 315, so that the pressed and formed steel plate is pushed out of the device to the next process.

[0065] With reference to Figures 12-16 The joint welding device 4 comprises a feeding conveying mechanism 41, a first joint roller pressing mechanism 42, a side pressing mechanism 43, a second joint roller pressing mechanism 44, a lower joint pressing mechanism 45, a traction mechanism 46, a straightening mechanism 47, an output mechanism 48 and a welding gun. The feeding conveying mechanism 41, the first joint roller pressing mechanism 42, the side pressing mechanism 43, the second joint roller pressing mechanism 44, the lower joint pressing mechanism 45, the traction mechanism 46, the straightening mechanism 47 and the output mechanism 48 are arranged in sequence. The first joint roller pressing mechanism 42, the second joint roller pressing mechanism 44 and the lower joint pressing mechanism 45 all adopt horizontal roller pressing structures in a top-and-bottom structure, and the side pressing mechanism 43 adopts a vertical roller pressing structure in a left-and-right structure. The welding gun is located at the output end of the lower joint pressing mechanism 45 and is not shown in the figure. The welding gun adopts a welding gun of the prior art.

[0066] The feeding conveying mechanism 41 comprises a transmission chain 411 and side limiting rollers 412 arranged in multiple groups and arranged on the two sides of the transmission chain 411. The transmission chain 411 can be driven to rotate by a motor and a transmission mechanism to convey the steel pipe to be welded placed on the transmission chain 411 to the first joint roller pressing mechanism 42, and the side limiting rollers 412 abut against the two sides of the steel pipe to limit the conveying direction of the steel pipe. The structure of the output mechanism 48 is the same as that of the feeding conveying mechanism 41.

[0067] With reference toFigure 13 The first joint roller pressing mechanism 42 comprises a vertical plate support 421, a lower shaft 422, a lower die 423, an upper shaft sleeve 424, an upper shaft 425, an upper die 426 and an upper shaft lifting cylinder 427. The two ends of the lower shaft 422 respectively pass through the vertical plate support 421 and are rotatably connected with the vertical plate support 421 through bearings, and the lower die 423 is sleeved on the middle part of the lower shaft 422 and is fixedly connected with the lower shaft 422. The upper shaft sleeve 424 is slidably connected with the vertical plate support 421, and the end of the upper shaft 425 is rotatably connected with the upper shaft sleeve 424. The upper die 426 is sleeved on the outside of the upper shaft sleeve 424 and is fixedly connected with the upper shaft sleeve 424, and the upper shaft lifting cylinder 427 is fixed to the vertical plate support 421. The telescopic end of the upper shaft lifting cylinder 427 is fixedly connected with the upper shaft sleeve 424 and can drive the upper shaft sleeve 424 to move up and down. The outer circumferential surface of the lower die 423 is a concave arc surface, the outer circumferential surface of the upper die 426 is a concave arc surface, and the middle part of the upper die 426 is provided with an annular directional convex ring 261.

[0068] The structure of the second joint roller pressing mechanism 44 is the same as that of the first joint roller pressing mechanism 42, and the second joint roller pressing mechanism 44 comprises a vertical plate support, a lower shaft, a lower die, an upper shaft sleeve, an upper shaft, an upper die and an upper shaft lifting cylinder. The middle part of the upper die is provided with an annular directional convex ring, and the width of the directional convex ring is smaller than that of the directional convex ring 261 of the first joint roller pressing mechanism 42.

[0069] Referring to Figure 14 The side pressing mechanism 43 comprises a side pressing frame 431, a side pressing lifting mechanism 432, a cylinder mounting seat 433, a side pressing cylinder 434, a side pressing shaft 435, a pin shaft mounting seat 436, a pin shaft 437 and a side pressing die 438. The cylinder mounting seat 433 is slidably connected with the side pressing frame 431, the side pressing lifting mechanism 432 is connected with the cylinder mounting seat 433 and can drive the cylinder mounting seat 433 to move up and down to adjust the height of the cylinder mounting seat 433, and the side pressing lifting mechanism 432 can adopt the lifting mechanism of the prior art. The side pressing cylinder 434 is fixed to the cylinder mounting seat 433, the output end of the side pressing cylinder 434 is connected with one end of the side pressing shaft 435, the other end of the side pressing shaft 435 is fixedly connected with the pin shaft mounting seat 436, the two ends of the pin shaft 437 are fixedly connected with the pin shaft mounting seat 436, and the side pressing die 438 is sleeved on the outside of the pin shaft 437 and is rotatably connected with the pin shaft 437.

[0070] Referring to Figure 15The down-pressing joint mechanism 45 comprises a down-pressing gantry 451, a down-pressing oil cylinder 452, a down-pressing die mounting base 453, a down-pressing die 454, a vertical die mounting base 455 and a vertical die 456. The down-pressing oil cylinder 452 is fixed to the upper part of the down-pressing gantry 451, the down-pressing die mounting base 453 is connected to the output end of the down-pressing oil cylinder 452, the down-pressing die 454 is mounted to the down-pressing die mounting base 453, the vertical die mounting base 455 is fixed to the lower part of the down-pressing gantry 451, and the vertical die 456 is mounted to the vertical die mounting base 455 and located below the down-pressing die 454.

[0071] The traction mechanism 46 comprises a frame, a motor, a roller shaft, traction rollers and a traction linkage. The roller shaft is rotatably connected to the frame by a bearing. The traction rollers are fixed to the roller shaft, and the motor is connected to the roller shaft and can drive the roller shaft to rotate to drive the traction rollers. The roller shaft and the traction rollers are oppositely arranged as two. When the steel pipe enters between the two traction rollers, the traction rollers apply a traction force to the steel pipe to shake the steel pipe and send it to the straightening mechanism 47. The motor is connected to the traction linkage, and the motor is connected to the roller shaft through the traction linkage and connected to the lower shaft and the upper shaft of the first joint roller pressing mechanism 42 and the second joint roller pressing mechanism 44 to realize linkage.

[0072] Referring to Figure 16 The straightening mechanism 47 comprises a straightening base 471, a longitudinal sliding plate 472, a longitudinal sliding plate pressing strip 473, a transverse sliding plate 474, a transverse sliding plate pressing strip 475, a lifting adjusting mechanism 476, a horizontal adjusting mechanism 477 and a straightening die mechanism 478. The longitudinal sliding plate pressing strip 473 is fixed to one side of the straightening base 471, the edges of the longitudinal sliding plate 472 are slidably connected to the longitudinal sliding plate pressing strip 473, the transverse sliding plate pressing strip 475 is fixed to the longitudinal sliding plate 472, the edges of the transverse sliding plate 474 are slidably connected to the transverse sliding plate pressing strip 475, and the lifting adjusting mechanism 476 is fixed to the straightening base 471. The lifting adjusting mechanism 476 is connected to the longitudinal sliding plate 472 and can adjust the vertical position of the longitudinal sliding plate 472. The lifting adjusting mechanism 476 can adopt the lifting adjusting mechanism of the prior art. The horizontal adjusting mechanism 477 is fixed to the longitudinal sliding plate 472, the horizontal adjusting mechanism 477 is connected to the transverse sliding plate 474 and can adjust the horizontal position of the transverse sliding plate 474. The horizontal adjusting mechanism 477 can adopt the lifting adjusting mechanism of the prior art. The straightening die mechanism 478 is mounted to the transverse sliding plate 474.

[0073] The longitudinal slide plate 472 and the transverse slide plate 474 are both provided with a through center material passing hole 479, and the orthopedic die mechanism 478 is arranged in a ring shape and is provided with four orthopedic die mechanisms. The orthopedic die mechanism 478 comprises a roller die mounting seat 781, a lifting adjuster 782, a roller die box 783, a roller die shaft 784 and a roller die, and the roller die mounting seat 781 is fixed to the transverse slide plate 474. The lifting adjuster 782 is fixedly connected with the roller die mounting seat 781, and the roller die box 783 is slidingly connected with the roller die mounting seat 781. The lifting adjuster 782 is connected with the roller die box 783 and can drive the roller die box 783 to move towards the center of the material passing hole 479, and the lifting adjuster 782 can adopt an adjuster in the prior art. The roller die shaft 784 is rotatably connected with the roller die box 783 through a bearing, and a roller die is sleeved on the roller die shaft 784 and is fixedly connected with the roller die shaft 784. The four roller dies are arranged around the edges of the material passing hole 479, and the included angle between the roller die and the horizontal direction or the vertical direction is about 45 degrees. Through the adjustment of the lifting adjuster 782, the orthopedic adjustment of the steel pipe with different diameters can be adapted. By replacing the roller dies with different shapes, the steel pipe can be shaped and adjusted into the required shape, including square, circular or other shaped pipes, and the application range is wide.

[0074] Embodiment 2

[0075] The steel plate bending and welding pipe preparation method comprises the following steps:

[0076] S1, the steel plate is conveyed through the feeding conveying device 1 and passes through the material passing groove 20 of the edge milling device 2;

[0077] S2, when the steel plate passes through the material passing groove 20 of the edge milling device 2, the upper pressing wheel set 25 and the lower pressing wheel set 27 of the edge milling device 2 clamp the steel plate to ensure that the steel plate remains stable during operation, and the two symmetrically arranged milling cutters 291 of the edge milling device 2 simultaneously mill the edges of the opposite two sides of the steel plate;

[0078] S3, the milled steel plate is conveyed to the bending forming device 3, and the beam bending mechanism 31 of the bending forming device 3 cooperates with the first side pushing mechanism 32 and the second side pushing mechanism 35 to press and gradually bend the steel plate into a cylindrical to-be-welded steel pipe:

[0079] S3-1, the steel plate is conveyed to the upper of the conveying mechanism 33 from one side of the beam bending mechanism 31, and the first side pushing mechanism 32 pushes the edge of the steel plate in contact with the first side pushing mechanism 32 to the convex die 317 and the concave die 318 of the beam bending mechanism 31;

[0080] S3-2, the hydraulic cylinder 313 drives the movable beam 314 to move downward, so that the upper die seat 315 moves downward and drives the convex die 317 to move downward, so as to press the steel plate to form a small section of the arc surface bending upward along the edge of the steel plate;

[0081] S3-3, the rear hydraulic cylinder 313 drives the punch 317 to move upward, the second side pushing mechanism 35 pushes the other edge of the steel plate to push the steel plate a small distance, and the punch 317 is pressed again to press the other arc surface connected to the previous pressed arc surface;

[0082] S3-4, repeat step S3-3, when the hydraulic cylinder 313 drives the punch 317 to lift and pause, the second side pushing mechanism 35 pushes the other edge of the steel plate to the bottom of the punch 317, and then gradually presses from the other edge of the steel plate to the center position of the steel plate, and then the punch 317 stops pressing, so that the whole steel plate is curled into a cylindrical shape of the steel pipe to be welded, and the rear pushing mechanism 34 is started to push out the steel pipe to be welded.

[0083] S4, the steel pipe to be welded is conveyed to the joint welding device 4 for joint post-welding and shaping to obtain a finished steel pipe:

[0084] S4-1, the steel pipe to be welded 10 is input into the first joint rolling mechanism 42 through the feeding conveying mechanism 41 and passes between the upper die 426 and the lower die 423, and the pressure of the upper die 426 and the lower die 423 makes the two edges of the steel pipe to be welded 10 fold to the two sides of the convex ring 261;

[0085] S4-2, after being folded by the first joint rolling mechanism 42, it enters the side pressing mechanism 43 for side pressing;

[0086] S4-3, the side pressing mechanism 43 side presses the steel pipe to be welded 10 to further fold the two side edges;

[0087] S4-4, after being folded by the second joint rolling mechanism 44, the steel pipe to be welded 10 enters the lower joint pressing mechanism 45 for lower pressing, so that the two edges of the steel pipe to be welded 10 are completely folded and then welded;

[0088] S4-5, the welded steel pipe is pulled by the traction mechanism 46 to the two shaping mechanisms 47 for shaping, and then output by the output mechanism 48.

[0089] The feeding conveying device 1, the edge milling device 2, the bending forming device 3 and the joint welding device 4 form a complete welded steel pipe automatic production line, and the steel plate enters the edge milling device 2 after being milled by the feeding conveying device 1, and then enters the bending forming device 3 for bending forming, and then enters the joint welding device 4 for joint welding and shaping to form a welded steel pipe, which is automatically completed by cooperation of each device. The loading, positioning and unloading operation processes in the processing process of each scattered equipment are omitted, and the production efficiency is greatly improved.

[0090] The whole curling process is completed by the same beam bending mechanism, cancels the bulky and numerous roller mechanisms in the prior art, greatly simplifies the production process and production equipment, and the whole device has simple structure, is convenient to maintain and reduces production cost.

[0091] The joint welding adopts the cooperation of the first joint roller mechanism, the side pressing mechanism, the second joint roller mechanism and the lower joint pressing mechanism arranged in sequence, a side pressing roller is arranged between the two upper and lower joint pressing roller mechanisms, the side pressing mechanism and the upper and lower joint pressing roller mechanisms are respectively arranged, a side pressing force is generated when the steel pipe to be welded passes through the side pressing mechanism, only one single side pressing mechanism is needed, and the joint gap of the half-open steel pipe can be completely closed by cooperating with the lower joint pressing mechanism. The directional convex ring is arranged in the opening joint of the half-open pipe, can ensure that the steel pipe cannot rotate, ensures that the joint is upward, that is, directly faces the position of the rear welding gun, and ensures welding precision. The longitudinal pressing joint mode is used before welding, the opening joint of the steel plate is butt jointed, the traditional left and right side pressing mode is abandoned, the material usage amount of the pressing roller die can be greatly reduced, that is, the longitudinal roller can be very small, the roller material usage amount is saved, the weight of the whole unit is reduced, the equipment structure is simple, the cost is low, and the equipment is convenient to disassemble, maintain and assemble.

[0092] The above only describes some embodiments of the present application. For those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the protection scope of the present application.

Claims

1. A system for the preparation of a steel plate bend pipe, characterized in that, The feeding conveying device (1), the edge milling device (2), the bending forming device (3) and the joint welding device (4) are included, the feeding conveying device (1) is provided with a plurality of conveying rollers (11), the edge milling device (2) is embedded between two conveying rollers (11), the input end of the bending forming device (3) is connected with the output end of the feeding conveying device (1), the feeding conveying device (1) is used for conveying the steel plate to the bending forming device (3) after the edge milling device (2) mills the edge, the input end of the joint welding device (4) is connected with the output end of the bending forming device (3), the bending forming device (3) is used for conveying the steel plate to the joint welding device (4) after the steel plate is pressed into a cylindrical shape, and the joint welding device (4) is used for joint welding of the two edges of the pressed steel plate to form a steel pipe; The bending forming device (3) comprises a beam bending mechanism (31), a first side pushing mechanism (32), a conveying mechanism (33), a pushing-out mechanism (34) and a second side pushing mechanism (35), the first side pushing mechanism (32) and the second side pushing mechanism (35) are respectively located on the two sides of the beam bending mechanism (31), the conveying mechanism (33) is located on one side of the beam bending mechanism (31) and is embedded with the first side pushing mechanism (32), the pushing-out mechanism (34) is located at one end of the beam bending mechanism (31), the beam bending mechanism (31) comprises a stand (311), a fixed beam (312), a hydraulic cylinder (313), a movable beam (314), an upper die seat (315) and a lower die seat (316), the stand (311) is provided with two and is respectively fixed to the two ends of the fixed beam (312), the hydraulic cylinder (313) is fixed to the fixed beam (312), the movable beam (314) is located below the fixed beam (312), the output end of the hydraulic cylinder (313) is connected with the movable beam (314) and can drive the movable beam (314) to move up and down, the two ends of the movable beam (314) are respectively connected with the stand (311) in sliding mode, the upper die seat (315) is fixed to the movable beam (314), the lower die seat (316) is located below the upper die seat (315), the lower die seat (316) is provided with a recessed die (318) penetrating through the upper end of the lower die seat (316), the lower end of the upper die seat (315) is provided with a long strip-shaped protruding die (317), and the shape of the protruding die (317) is matched with the recessed die (318). The joint welding device (4) comprises a feeding conveying mechanism (41), a first joint roller pressing mechanism (42), a side pressing mechanism (43), a second joint roller pressing mechanism (44), a lower joint pressing mechanism (45), a traction mechanism (46), a straightening mechanism (47) and a welding gun, the feeding conveying mechanism (41), the first joint roller pressing mechanism (42), the side pressing mechanism (43), the second joint roller pressing mechanism (44), the lower joint pressing mechanism (45), the traction mechanism (46) and the straightening mechanism (47) are sequentially arranged, the first joint roller pressing mechanism (42), the second joint roller pressing mechanism (44) and the lower joint pressing mechanism (45) are all horizontal roller pressing mechanisms with an upper-lower structure, the side pressing mechanism (43) is a vertical roller pressing mechanism with a left-right structure, and the welding gun is located at an output end of the lower joint pressing mechanism (45); The first joint roller pressing mechanism (42) comprises a vertical plate support (421), a lower shaft (422), a lower die (423), an upper shaft sleeve (424), an upper shaft (425), an upper die (426) and an upper shaft lifting oil cylinder (427), the end of the lower shaft (422) penetrates through the vertical plate support (421) and is rotationally connected with the vertical plate support (421), the lower die (423) is sleeved on the outside of the lower shaft (422) and is fixedly connected with the lower shaft (422), the upper shaft sleeve (424) is slidably connected with the vertical plate support (421), the end of the upper shaft (425) is rotationally connected with the upper shaft sleeve (424), the upper die (426) is sleeved on the outside of the upper shaft sleeve (424) and is fixedly connected with the upper shaft sleeve (424), the upper shaft lifting oil cylinder (427) is fixed to the vertical plate support (421), and the telescopic end of the upper shaft lifting oil cylinder (427) is fixedly connected with the upper shaft sleeve (424) and can drive the upper shaft sleeve (424) to move up and down.

2. The steel pipe bending and welding system according to claim 1, wherein, The edge milling device (2) comprises an edge milling base (21), two sets of opposite limiting racks (22), slide rails (23), a rack adjusting mechanism (24), an upper pressing wheel set (25), an upper pressing wheel set adjusting mechanism (26), a lower pressing wheel set (27), side wheels (28) and an edge milling mechanism (29). The slide rails (23) and the rack adjusting mechanism (24) are fixed to the upper side of the edge milling base (21). The lower end of the limiting rack (22) is slidably connected with the slide rail (23). The rack adjusting mechanism (24) is connected with the limiting rack (22) and can drive the limiting rack (22) to move along the slide rail (23). The upper pressing wheel set adjusting mechanism (26) is fixed to the upper part of the limiting rack (22). The upper pressing wheel set adjusting mechanism (26) is connected with the upper pressing wheel set (25) and can drive the upper pressing wheel set (25) to move up and down. The lower pressing wheel set (27) is fixed to the limiting rack (22) and located below the upper pressing wheel set (25). The side wheels (28) are arranged in two and fixed to the two ends of the limiting rack (22). The limiting rack (22) is provided with a horizontal through material passing groove (20). The material passing groove (20) penetrates between the upper pressing wheel set (25) and the lower pressing wheel set (27). The side wheels (28) are correspondingly arranged with the material passing groove (20).

3. The steel pipe bending and welding system according to claim 2, wherein, The edge milling mechanism (29) comprises a milling cutter (291), a milling cutter seat (292), an adjustable rack (293), a horizontal adjusting mechanism (294), a milling cutter motor mounting seat (295), a vertical adjusting mechanism (296), a milling cutter motor (297) and a rotating shaft. The adjustable rack (293) is slidably connected with the milling cutter seat (292). The horizontal adjusting mechanism (294) is installed on the milling cutter seat (292). The horizontal adjusting mechanism is connected with the adjustable rack (293) and can drive the adjustable rack (293) to move horizontally. The milling cutter motor mounting seat (295) is slidably connected with the adjustable rack (293). The vertical adjusting mechanism (296) is installed on the adjustable rack (293). The vertical adjusting mechanism (296) is connected with the milling cutter motor mounting seat (295) and can drive the milling cutter motor mounting seat (295) to move vertically. The milling cutter motor (297) is fixed to the milling cutter motor mounting seat (295). The milling cutter (291) is fixed to the output end of the milling cutter motor (297) through the rotating shaft. The milling cutter (291) is located beside the lower pressing wheel set (27).

4. The steel pipe bending and welding system according to claim 1, wherein The first side pushing mechanism (32) comprises a base (321), a guide rail (322), a sliding block base (323), a side pushing plate (324), a screw rod (325), a motor (326) and a transmission mechanism (327), the guide rail (322) is fixed to the upper side of the base (321), the lower side of the sliding block base (323) is slidably connected with the guide rail (322), the side pushing plate (324) is fixed to the upper side of the sliding block base (323), the screw rod (325) penetrates and cooperates with the screw thread, the motor (326) is fixedly arranged, and the motor (326) is connected with the screw rod (325) through the transmission mechanism (327) and can drive the screw rod (325) to rotate.

5. The steel plate bending and welding pipe production method of the steel plate bending and welding pipe production system according to any one of claims 1 to 4, characterized by, The method comprises the following steps: S1, the steel plate is conveyed through the feeding conveying device (1) and passes through the passing groove (20) of the edge milling device (2); S2, when the steel plate passes through the passing groove (20) of the edge milling device (2), the milling cutter (291) of the edge milling device (2) simultaneously mills the edges of the opposite two sides of the steel plate; S3, the milled steel plate is conveyed to the bending forming device (3), the beam type bending mechanism (31) of the bending forming device (3) cooperates with the first side pushing mechanism (32) and the second side pushing mechanism (35) to press and gradually bend the steel plate into a cylindrical to-be-welded steel pipe; S4, the to-be-welded steel pipe is conveyed to the joint welding device (4) to be welded after jointing and shaped to obtain a finished steel pipe.

6. The method of claim 5 wherein the steel pipe is prepared by bending and welding a steel sheet, characterized by, The step S3 further comprises the following steps: S3-1, the steel plate is conveyed to the conveying mechanism (33) from one side of the beam type bending mechanism (31), and the first side pushing mechanism (32) pushes the edge of the steel plate in contact with the first side pushing mechanism (32) to the convex die (317) and the concave die (318) of the beam type bending mechanism (31); S3-2, the hydraulic cylinder (313) drives the movable beam (314) to move downward to make the upper die seat (315) move downward to drive the convex die (317) to move downward to press the steel plate to form a small section of upward bending arc surface along the edge of the steel plate; S3-3, the rear hydraulic cylinder (313) drives the convex die (317) to move upward, the second side pushing mechanism (35) pushes the other edge of the steel plate to push the steel plate a small distance, and the convex die (317) is pressed again to press another arc surface connected with the previous arc surface; S3-4, the step S3-3 is repeated, when the steel plate is gradually pressed from one edge to the center position of the steel plate, the hydraulic cylinder (313) drives the convex die (317) to lift and pause, the second side pushing mechanism (35) pushes the other edge of the steel plate to the lower side of the convex die (317), and then gradually presses from the other edge of the steel plate to the center position of the steel plate, and then the convex die (317) stops pressing, so that the whole steel plate is curled into a cylindrical to-be-welded steel pipe, and the rear pushing mechanism (34) is started to push out the to-be-welded steel pipe.

7. The method of claim 5 wherein the steel pipe is prepared by bending and welding a steel sheet, characterized by, The step S4 further comprises the following steps: S4-1, the steel pipe to be welded (10) is input into the first joint rolling mechanism (42) by the feeding conveying mechanism (41) and is rolled between the upper die (426) and the lower die (423), the pressure of the upper die (426) and the lower die (423) makes the two edges of the steel pipe to be welded (10) to be rolled to the two sides of the convex ring 261; S4-2, after being rolled by the first joint rolling mechanism (42), the steel pipe to be welded (10) enters the side pressing mechanism (43) for side pressing; S4-3, the steel pipe to be welded (10) enters the second joint rolling mechanism (44) after being side pressed by the side pressing mechanism (43) to make the two edges of the steel pipe to be welded (10) to be further rolled; S4-4, after being rolled by the second joint rolling mechanism (44), the steel pipe to be welded (10) enters the lower joint mechanism (45) for lower pressing, the two edges of the steel pipe to be welded (10) are completely rolled and then welded; S4-5, the welded steel pipe is pulled to the two straightening mechanisms (47) by the pulling mechanism (46) for straightening and then is output by the output mechanism (8).

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