Square pile hoop production line

Abstract

The invention discloses a square pile hoop production line which comprises a straightening and profiling unit, the straightening and profiling unit is provided with a straightening station and a profiling station, and strip steel is straightened and profiled through the straightening station and the profiling station; the cutting-off unit is provided with a cutting-off station, and strip steel is cut off by the cutting-off station in a fixed-length mode to form strip steel sections; the bending unit is provided with a bending station, and the strip steel section is bent for multiple times through the bending station to form a semi-finished hoop; and the tailor-welding unit is provided with a tailor-welding station, and the semi-finished hoop is tailor-welded into a whole through the tailor-welding station to form a finished hoop. According to the hoop production line, semi-finished product hoop tailor-welding integrated automation is achieved, hoop production automation is achieved except for partial processes, and the production line efficiency can be greatly improved.

Description

Technical Field

[0001] The present application provides a square pile hoop production line, which relates to the technical field of construction engineering. Background Art

[0002] Concrete square piles are a type of pipe pile product in the construction industry. Square piles are divided into many types, among which square piles without end plates are the most widely used type of pipe piles. The pipe piles have no end plates at both ends, and the internal cage reinforcement main reinforcement is equipped with threaded sleeves at both ends for tensioning the main reinforcement. In order to improve the end surface quality of the pipe piles, there is a hoop at each end of the pipe pile to prevent concrete leakage during the production of the pipe piles. A number of rivets are welded on the hoop to position the hoop, and the rivet is driven by the threaded sleeve, and the rivet drives the hoop so that the hoop is close to the tension plate to ensure the flatness of the end surfaces at both ends of the square pile after forming. The profiled structure of the hoop itself can make the combination of the hoop and concrete more firmly, and the external flared mouth can prevent concrete from leaking out of the pipe mold (square pile production mold).

[0003] The production of square pile hoop generally requires straightening, profiling, corner cutting, punching, cutting, folding, bending, butt welding (welding integration), rivet welding and other processes. For the existing technology, such as CN116550897A steel strip integrated processing equipment and hoop production line, CN116441948A hoop integrated production equipment, CN115890076A rivet welding device, CN111842545A square pile hoop production equipment and other patent documents have achieved the technical solutions provided by the patent documents. Automation or semi-automation of other processes besides the butt welding (welding in one) process; In the prior art, butt welding (welding in one) still requires manual use of simple sleeve seaming tooling to perform sleeve seam joining and welding to make it a closed square sleeve. This production process cannot achieve continuous production. Generally, one person cuts the material and one person welds, which is time-consuming and labor-intensive, and affects production efficiency. In addition, due to the thin thickness of the sleeve strip, manual welding of the sleeve is prone to perforation, the weld quality and appearance are not uniform, and the forming size error is large. In addition, in the prior art, the sleeve automation production equipment is suitable for a single strip width and cannot adapt to multiple specifications. Summary of the invention

[0004] The technical problem to be solved by the present application is that the existing ferrule production still requires manual welding, resulting in low production efficiency of the ferrule production line.

[0005] The present application provides a square pile hoop production line, comprising

[0006] A straightening and profiling unit, wherein the straightening and profiling unit is provided with a straightening station and a profiling station, and the strip steel is straightened and profiled through the straightening station and the profiling station;

[0007] A cutting unit, wherein the cutting unit is provided with a cutting station, and the strip steel is cut to a fixed length by the cutting station to form a strip steel segment;

[0008] A bending unit, wherein the bending unit is provided with a bending station, and the strip steel section is subjected to multiple bending strokes of the semi-finished product hoop at the bending station;

[0009] The welding unit is provided with a welding station, and the semi-finished ferrule is welded into one piece by the welding station to form a finished ferrule.

[0010] Preferably, the straightening and profiling unit includes a guiding assembly, a straightening assembly and a profiling assembly; the profiling assembly includes a plurality of profiling roller groups, the profiling roller group includes an upper profiling roller and a lower profiling roller whose outer contour shapes match each other, the upper profiling roller and the lower profiling roller are provided with a gap for the strip to pass through, and the profiling shape of the profiling roller group is defined by the outer contour shapes of the upper profiling roller and the lower profiling roller; the profiling shapes of the plurality of profiling roller groups gradually change to a preset shape, and the flat-shaped strip is formed into a preset shape after being gradually profiling by the plurality of profiling roller groups in sequence.

[0011] Preferably, a corner cutting unit and a punching unit are further provided between the straightening and profiling unit and the cutting unit; the corner cutting unit is provided with a corner cutting station, and the strip is cut at a first preset position by the corner cutting station to form a corner cutting notch; the punching unit is provided with a punching station, and the strip is punched at a second preset position by the punching station.

[0012] Preferably, the cutting unit includes a third base, a movable seat, an upper cutting knife and a lower cutting knife, wherein the upper cutting knife and the lower cutting knife are both arranged on the movable seat, and the movable seat is arranged on a transverse track on the third base; it also includes an operating handle for adjusting the transverse position of the movable seat; the upper cutting knife and the lower cutting knife are arranged as contoured cutting blades, one side of which is similar to the cross-sectional shape of the strip to be cut, and the other side forms a flared opening.

[0013] Preferably, a folding unit is further provided between the cutting unit and the bending unit, and the folding unit is provided with a folding station, and the edges of the strip steel section are folded at the folding station.

[0014] Furthermore, the folding unit includes a fixed component and a folding tool assembly; the fixed component includes a relatively arranged supporting component located below and a pressing component located above, and a gap is arranged between the supporting component and the pressing component for passing the strip steel section; the folding tool assembly includes a folding knife and an actuator, the edge of the strip steel section to be folded is exposed from the fixed component, and the folding knife pushes the edge from bottom to top to fold the edge; the folding knife is arranged at an angle, and the movement path of the actuator is arranged at an inclined angle with the vertical direction, and the upward pushing path of the folding knife is arranged to move and push from a position obliquely below away from the strip steel section to a position obliquely above close to the strip steel section.

[0015] Preferably, the bending unit includes an inner bending shaft located at the top, an outer eccentric bending shaft located at the bottom, and a clamping assembly for clamping the strip steel segment; the rotating axis of the outer eccentric bending shaft performing the rotation action is set as the central axis of the inner bending shaft.

[0016] Preferably, the welding unit includes a welding station for placing the semi-finished hoop after bending, and the semi-finished hoop includes a left half and a right half to be welded; a backrest is provided at the rear of the welding station, a front propulsion assembly is provided at the front, a left propulsion assembly is provided on the left side, and a right propulsion assembly is provided on the right side; a left support assembly is provided below the left half and a left lower pressure assembly is provided above the left half, a right support assembly is provided below the right half and a right lower pressure assembly is provided above the right half, and an intermediate positioning plate assembly is provided between the left and right halves; and a movable welding gun assembly is also provided corresponding to the joint seam between the left and right halves.

[0017] Furthermore, the step of performing the welding operation by the welding unit includes:

[0018] Step 1: The left and right halves of the semi-finished ferrule to be welded are placed downward on the welding station, and the front push assembly pushes the semi-finished ferrule against the rear support plate;

[0019] Step 2: Move the middle positioning plate assembly between the left half and the right half;

[0020] Step 3: The left pushing assembly pushes the cut surface of the left half section against the middle positioning plate, and the left pressing assembly presses down and clamps the left half section with the left supporting assembly;

[0021] Step 4: The right pushing assembly pushes the cut surface of the right half section against the middle positioning plate, the middle positioning plate assembly moves out, the right pushing assembly continues to push the cut surface of the right half section against the cut surface of the left half section, the right pressing assembly presses down and clamps the right half section with the right supporting assembly;

[0022] Step 5: Move the welding gun assembly to the joint seam position, and move the welding gun to weld the joint seam.

[0023] Preferably, it also includes a rivet welding unit, which is provided with a rivet welding station, and the finished hoop is welded with rivets at the rivet welding station; the rivet welding unit includes a three-dimensional movable truss, a rivet welding assembly arranged on the three-dimensional movable truss, a conveyor frame and a hoop fixing assembly arranged on the conveyor frame; the rivet welding assembly includes a rotating seat and a rivet feeding assembly and a rivet welding clamp assembly arranged below the rotating seat, the rivet feeding assembly includes a rivet material bin and a rivet discharge port, a rivet clamp that moves up and down is provided at the rivet discharge port, the rivet welding clamp assembly includes a movable electrode, a fixed electrode and a driver that drives the movable electrode to move closer to the fixed electrode, and the rivet clamp moves back and forth at the rivet discharge port and the fixed electrode.

[0024] The ferrule production line provided in the embodiment of the present application can solve the production process of strip steel of different widths, different sizes, ferrules with folded edges and ferrules without folded edges. The ferrules with folded edges are produced by the process of strip steel uncoiling, straightening, profiling, corner cutting, punching, cutting, caching and conveying, folding, bending, butt welding and riveting. The ferrules without folded edges are produced by the process of strip steel uncoiling, straightening, profiling, cutting, caching and conveying, bending and butt welding. The production line can adapt to strip steel of different widths and produce ferrules of various specifications by switching the profiling rollers and adjusting the strip steel limit. The process is fully streamlined. It only needs to manually load the strip steel, install the rivets, and stack the produced products. The remaining processes are basically automated. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the straightening and profiling unit structure provided in the embodiment of the present application Figure 1 ;

[0026] Figure 2 Schematic diagram of the straightening and profiling unit structure provided in the embodiment of the present application Figure 2 ;

[0027] Figure 3 It is a schematic diagram of the structure of the profiling roller group in the straightening and profiling unit provided in the embodiment of the present application;

[0028] Figure 4 This is a schematic diagram of common profiled shapes of strip cross sections;

[0029] Figure 5 A schematic diagram of a spare profiling assembly in a straightening profiling unit provided in an embodiment of the present application;

[0030] Figure 6 This is a schematic diagram of the structure of the corner cutting unit provided in an embodiment of the present application;

[0031] Figure 7 It is a schematic diagram of a notch formed by a notch unit when a strip is notched;

[0032] Figure 8 A schematic diagram of the punching unit structure provided in an embodiment of the present application;

[0033] Fig. 9 It is a schematic diagram of the strip steel section structure;

[0034] Fig.10 This is a schematic diagram of the structure of a cutting unit provided in an embodiment of the present application;

[0035] Fig.11 The upper cutting knife and the lower cutting knife provided in the embodiment of the present application are schematic diagrams of profiled cutting edges;

[0036] Fig.12 This is a schematic diagram of the structure of the strip steel buffer and conveying unit provided in an embodiment of the present application;

[0037] Fig.13 This is a schematic diagram of the hemming unit structure provided in an embodiment of the present application;

[0038] Fig.14 A schematic diagram of the folding action provided in an embodiment of the present application;

[0039] Fig.15 It is a schematic diagram of the semi-finished ferrule structure;

[0040] Fig.16 A schematic diagram of the bending unit structure provided in an embodiment of the present application;

[0041] Fig.17 Schematic diagram of bending action for bending unit Figure 1 ;

[0042] Fig.18 Schematic diagram of bending action for bending unit Figure 2 ;

[0043] Fig.19 Schematic diagram of bending action for bending unit Figure 3 ;

[0044] Fig. 20 This is a schematic diagram of the structure of the welding unit provided in the embodiment of the present application;

[0045] Fig.21 A schematic diagram of the structure of a welding gun assembly provided in an embodiment of the present application;

[0046] Fig. 22 This is a schematic diagram of the structure of the intermediate positioning plate assembly provided in an embodiment of the present application;

[0047] Fig.23 This is a schematic diagram of the structure of a rivet welding unit provided in an embodiment of the present application;

[0048] Fig.24 Schematic diagram of the rivet welding assembly structure provided in the embodiment of the present application Figure 1 ;

[0049] Fig.25 Schematic diagram of the rivet welding assembly structure provided in the embodiment of the present application Figure 2 ;

[0050] Description of reference numerals:

[0051] Strip steel 1, bell mouth 11, arc section 12, straight end section 13, corner cutting 14, punching 15, left half section 16, right half section 17;

[0052] Straightening and profiling unit 100, guide assembly 110, input end guide 111, intermediate guide 112, output end guide 113, straightening assembly 120, straightening roller set 121, adjustment handle 122, drive motor 123, clamping roller set 124, adjustment cylinder 125, profiling assembly 130, spare profiling assembly 130-1, profiling roller set 131, upper profiling roller 131-1, lower profiling roller 131-2;

[0053] Corner cutting unit 200, first base 201, first pressing plate 202, upper cutting knife 203, lower cutting knife 204;

[0054] Punching unit 300, second base 301, second pressing plate 302, upper punching knife 303;

[0055] Cutting unit 400, third base 401, transverse track 401-1, slider 401-2, operating handle 401-3, moving base 402, upper cutting knife 403, lower cutting knife 404;

[0056] Folding unit 500, fixing assembly 510, supporting assembly 511, pressing assembly 512, flanging tool assembly 520, flanging tool 521, actuator 522;

[0057] Bending unit 600, inner bending shaft 601, outer eccentric bending shaft 602, clamping assembly 603, upper conveying roller 603-1, lower conveying roller 603-2, guide wheel 604;

[0058] Welding unit 700, backing plate 701, front propulsion assembly 702, left propulsion assembly 703, right propulsion assembly 704, left clamping assembly 705, right clamping assembly 706, middle positioning plate assembly 707, positioning plate 707-1, lifting cylinder 707-2, welding gun assembly 708, front and rear moving parts 708-1, lifting parts 708-2, welding gun 708-3, left and right adjusting parts 708-4;

[0059] Rivet button welding unit 800, three-dimensional moving truss 810, riveted button welding assembly 820, rotating seat 821, riveted button feeding assembly 822, riveted button material bin 822-1, riveted button discharge port 822-2, riveted button clamp 822-3, riveted button welding clamp assembly 823, movable electrode 823-1, fixed electrode 823-2, driver 823-3, conveying frame 830, and ferrule fixing assembly 840;

[0060] Strip steel buffer and conveying unit 900, fourth base 901, conveying assembly 902, lower pressure roller 902-1, conveying power roller 902-2, and limiting wheel set 903. DETAILED DESCRIPTION

[0061] To make the application more obvious and easy to understand, various exemplary embodiments will be introduced below. These examples are non-limiting, and it should be understood that they are used for the more general application aspects of the illustrative device, system and method. Without departing from the substantive content and scope of the application, these embodiments can be subjected to multiple changes, and can be replaced by equivalents. In addition, multiple changes can be carried out to adapt to the purpose, content or scope of the application in order to adapt to special situations, materials, material components, treatment types, treatment actions or steps. All these changes will be within the protection scope of the application.

[0062] For any materials, dimensions, quantities introduced in the overview or detailed description, they will be examples only and are not intended to limit the subject matter of the present application. Moreover, the various implementations of the embodiments described herein will complement each other, rather than purely interchangeably, unless otherwise indicated. In other words, implementations from one embodiment can be freely combined with implementations of other embodiments, as those of ordinary skill in the art will readily appreciate, unless it is indicated that these implementations are only for replacement.

[0063] In the description of this application, it should be noted that the terms "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0064] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0065] Example

[0066] The embodiment of the present application provides a square pile hoop production line, including a straightening and profiling unit 100, an optional corner cutting unit 200, an optional punching unit 300, a cutting unit 400, an optional folding unit 500, a bending unit 600, a welding unit 700 and an optional rivet welding unit 800. The strip steel is sequentially subjected to straightening and profiling, optional corner cutting or no corner cutting, punching, cutting, optional folding or no folding, bending, welding, optional rivet welding or no rivet welding and other processes to finally form different types of finished square pile hoop.

[0067] Exemplarily, common concrete square piles are divided into many types, among which square piles without end plates are a more widely used type of pipe pile. This type of pipe pile has no end plates at both ends, and threaded sleeves are installed at both ends of the internal cage reinforcement main reinforcement for tensioning the main reinforcement. In order to improve the end face quality of the pipe pile, there is a hoop at each end of the pipe pile to prevent concrete leakage during the production of the pipe pile. A number of rivets are welded on the hoop for positioning the hoop, and the rivet is driven by the threaded sleeve, and the rivet drives the hoop so that the hoop is pressed against the tensioning plate to ensure the flatness of the end faces of the square pile after forming. The profiled structure of the hoop itself can make the combination of the hoop and concrete more firmly, and the outward flared bell mouth can prevent concrete from leaking out of the square pile production mold. Therefore, the hoop without end plates needs to be fixed to the sleeves at both ends of the square pile by rivets, so folding and rivets are required, and the hoop without end plates can be used directly. In contrast, for the hoop with end plate, folding and riveting are not required. For the hoop for square pile with end plate, only the strip steel needs to be straightened, profiled, cut, bent, and hoop welded. The hoop and the end plate are welded to complete the production of the hoop with end plate, which can be used for square pile with end plate. The square pile hoop production line provided in the embodiment of the present application is suitable for the production of hoop with different widths and sizes, folded and non-folded hoop, and hoop without end plate and hoop with end plate.

[0068] Among them, the straightening and profiling unit 100 is provided with an input end and an output end. The raw material strip steel is usually a strip steel coil. The strip steel coil is loaded on a uncoiler for uncoiling and unloading. The unloaded strip steel enters the straightening and profiling unit 100 from the input end and is output from the output end in a straight state of a predetermined shape after straightening and profiling treatment.

[0069] See also Figure 1 , the straightening and profiling unit 100 includes a guide assembly 110, a straightening assembly 120 and a profiling assembly 130. In a further embodiment, the guide assembly 110 includes an input end guide 111, an intermediate guide 112 located between the straightening assembly 120 and the profiling assembly 130, and an output end guide 113. In the figure, the input end guide 111 includes two sets of guide wheels arranged oppositely at the input end, the intermediate guide 112 includes a set of guide wheels arranged oppositely between the straightening assembly 120 and the profiling assembly 130, and the output end guide 113 includes a set of guide wheels arranged oppositely at the output end. Therefore, the guide functions of the input end guide 111, the intermediate guide 112 and the output end guide 113 cover both sides of the straightening station and the profiling station. The spacing between each set of guide wheels is adjustable, which can adapt to strips of different widths. Each set of guide wheels limits the direction of the strip from both sides. The setting of multiple sets of guide wheels can ensure that the forward direction of the strip remains unchanged during the straightening and profiling process.

[0070] In a further embodiment, see Figure 1 and Figure 2The straightening assembly 120 includes a straightening roller group 121, which includes a plurality of straightening rollers arranged vertically, and a gap is provided between the straightening rollers located at the upper layer and the straightening rollers located at the lower layer. The strip steel 1 passes through the straightening roller group 121 and is straightened by the extrusion pressure of the upper and lower straightening rollers. The straightening assembly 120 also includes an adjustment handle 122 for adjusting the gap of the straightening roller group 121 and thus adjusting the extrusion pressure. The upper straightening roller is arranged on a movable frame, and the lower straightening roller is arranged on a fixed frame. The movable frame and the fixed frame are connected by a screw so that the movable frame can be raised and lowered. The adjustment handle 122 is fixed to the screw and the gap between the upper straightening roller and the lower straightening roller is adjusted by adjusting the movable frame to rise and fall, thereby controlling the extrusion pressure of the upper and lower straightening rollers. Furthermore, the lower straightening roller is an active roller, which is driven by a drive motor 123 and connected to all the lower straightening rollers through a transmission method such as a gear set, a sprocket or a belt. The strip steel is straightened and continuously conveyed by rotating and extruding the straightening roller group 121. In a further embodiment, the straightening assembly 120 also includes a clamping roller group 124, and the upper clamping roller of the clamping roller group 124 is controlled by the adjusting cylinder 125 to approach the lower clamping roller of the clamping roller group 124, thereby controlling the clamping force of the clamping roller group 124. The clamping roller group 124 is arranged at a position closer to the input end guide 111 relative to the straightening roller group 121, and plays a role in preliminarily clamping the strip.

[0071] See again Figure 1 and Figure 2 The profiling assembly 130 is located behind the straightening assembly 120 in the transmission direction of the production line. An intermediate guide 112 (stable guide, non-essential components can also be omitted) is additionally provided between the profiling assembly 130 and the straightening assembly 120. Specifically, the profiling assembly 130 includes a plurality of profiling roller groups 131, see Figure 3The profiling roller group 131 includes an upper profiling roller 131-1 and a lower profiling roller 131-2 whose outer contour shapes match each other. A gap is set between the upper profiling roller and the lower profiling roller for the strip steel 1 to pass through. The outer contour shapes of the upper profiling roller 131-1 and the lower profiling roller 131-2 determine the profiling shape. The protruding and concave structures distributed on the outer contours are used to roll the passing strip steel so that the strip steel forms a profiling shape. Since the profiling process is prone to rebound, at least two groups of profiling roller groups 131 should be used in the embodiment of the present application. The outer contour shapes of the multiple groups of profiling roller groups 131 change one by one, that is, the shape change from the flat-plate-shaped strip to the preset shape of the strip is divided into several shape changes. For example, the profiling shape of the first profiling roller group is 50% of the preset shape, and the profiling shape of the second profiling roller group is 100% of the preset shape. The flat-plate-shaped strip undergoes the first profiling shape change through the first profiling roller group and the second profiling shape change through the second profiling roller group, and rebound is avoided by a step-by-step gradual change. Similarly, more profiling roller groups can also be used to share the shape change. The gap of the profiling roller group 131 is adjustable. Similar to the straightening roller group 121, the lower profiling roller is set on the fixed frame, and the upper profiling roller is set on the movable frame. The spacing is adjusted by a handle. Similarly, a driving motor is used to connect the lower profiling roller through a gear group, a sprocket or a belt, and the strip is rotated and extruded by the profiling roller group 131 for profiling and continuous transportation.

[0072] It can be understood that the guide assembly 110 and the straightening assembly 120 can be arranged on the same frame or on separate frames, and it is only necessary that the conveying mechanism is aligned so that the strip can be conveyed stably.

[0073] For different specifications of ferrules, the common profiled shapes of the strip cross section are as follows: Figure 4 As shown, taking the direction shown in the figure as an example, from left to right there is a bell mouth 11, a plurality of arc segments 12 and a straight end segment 13. There are four common pressed shapes, such as Figure 4 As shown in the figure, the number of arc segments 12 is 1, 2, and 3 respectively, and the distances between the arc segments and the bell mouth are different or the distances between the arc segments are different. Different profiling shapes require different profiling roller groups 131. Therefore, in the embodiment provided in the present application, the profiling assembly 130 is replaceable, see Figure 5 The square pile hoop production line provided in this embodiment is provided with several groups of spare profiling components 130-1 (three groups are shown in the figure, which can be increased or decreased according to actual needs). Four groups are set together with the profiling components 130 to provide four profiling shapes.

[0074] After the strip is straightened and pressed, it will enter the corner cutting station. Corner cutting is not necessary. It is only needed when folding is needed later. For the production of ferrule products that do not require folding, the strip does not need to be cut at the corner cutting station. For ferrule products that need folding later, the material of the folded part needs to be cut off in advance at the position where the strip is cut. Corner cutting can ensure that the folded part of the rest is well connected and spliced ​​without gaps, which is conducive to welding and improves the quality of ferrule products.

[0075] For details, see Figure 6 The corner cutting unit 200 includes a first base 201, a first pressing plate 202, an upper cutter 203 and a lower cutter 204. The first base 201, the first pressing plate 202, the upper cutter 203 and the lower cutter 204 define a corner cutting station. The strip steel passes between the first base 201 and the first pressing plate 202. After the strip steel moves to a preset position, the pressing plate 202 presses the strip steel onto the base 201. The upper cutter 203 and the lower cutter 204 are distributed on the upper and lower sides of the strip steel to cooperate in shearing the strip steel to form a corner cutting notch. Figure 7 The angle cutting position 14 is usually also the cutting position or bending position in the subsequent process. In the embodiment provided in the present application, it is preferred to use a cylinder to drive the cutter and the press plate. The advantage of the cylinder is that it can provide a strong driving force. After the angle cutting is completed, the cylinder is reset and the strip continues to be transported to the next station.

[0076] The punching unit 300 has a similar structure to the corner cutting unit and is located behind the corner cutting unit in the transmission direction of the production line. The punching unit 300 is used to punch holes in the bends of the strip. Since the strip needs to be bent, a hole is punched out at the bend to facilitate the subsequent folding and bending of the strip. A total of 4 holes need to be punched out for each section of strip. For ferrules that do not require folding, that is, ferrules that need to be welded to the end plates, folding is not required, and the strip does not need to be punched at the punching station. In actual processing, the length of the first folding section is usually set to a fixed value, and the length of the last folding section is the length of the ferrule minus the length of the first folding section. The length of the first folding section is unified to facilitate the consistency of the positioning parameters of the subsequent folding, bending, and welding of ferrules of various specifications. For details, see Figure 8 The punching unit 300 includes a second base 301, a second pressing plate 302, an upper punching knife 303 and a lower punching knife (blocked by the strip steel 1 in the figure, not shown). The second base 301, the second pressing plate 302, the upper punching knife 303 and the lower punching knife define a punching station. The strip steel passes between the second base 301 and the second pressing plate 302. After the strip steel moves to a preset position, the second pressing plate 302 presses the strip steel onto the second base 301. The upper punching knife 303 and the lower punching knife are distributed on the upper and lower sides of the strip steel to cooperate in shearing the strip steel to form a punching hole 15. See Fig. 9 , four punching holes 15 form a group, and the outside of a group of punching holes is a corner cut 14, and the strip is subsequently cut at the corner cut position to obtain Fig. 9Strip steel section shown.

[0077] The strip is cut by a cutting unit 400, see Fig.10 The strip is cut at this cutting station, and its cutting length is the sum of the lengths of the four sides of the hoop. The cutting unit 400 includes a third base 401, a moving base 402, an upper cutting knife 403 and a lower cutting knife 404, and the moving base 402, the upper cutting knife 403 and the lower cutting knife 404 define a cutting station; the upper cutting knife 403 and the lower cutting knife 404 are both arranged on the moving base, and the moving base 402 is arranged on a transverse track on the third base 401, and the moving base 402 slides on the transverse track and the transverse movement position is controlled by the illustrated operating handle, the lower cutting knife 404 is a fixed knife, and the upper cutting knife 403 is an up-and-down moving knife, and the strip passes between the upper cutting knife 403 and the lower cutting knife 404, and after reaching the preset position, the upper cutting knife 403 is pressed down to form a shearing cut with the lower cutting knife 404 to form a strip. Fig. 9 Strip steel section shown.

[0078] In the embodiment of the present application, the upper cutting blade 403 and the lower cutting blade 404 are contoured cutting blades, and the cutting blade of the lower cutting blade 404 and the upper cutting blade 403 have a shape similar to the cross-sectional shape of the strip to be cut on one side and a flared opening on the other side, see Fig.11 Taking the direction shown in the figure as an example, the shape of the left section of the cutting blade of the upper cutting knife 403 matches the shape of the bell mouth 11 of the strip steel, and the right section of the upper cutting knife 403 tilts upward to form an expansion mouth with the lower cutting knife 404. When the upper cutting knife 403 is pressed down, the left end first contacts the strip steel, and cooperates with the lower cutting knife 404 to form a pair of scissors, gradually cutting the strip steel from left to right, thereby ensuring that the strip steel at the cutting position is not deformed and has a consistent appearance; at the same time, the moving seat 402 can carry the upper cutting knife 403 and the lower cutting knife 404 to move in the vertical direction (lateral) of the strip steel forward. For strip steels of different widths, the position of the strip steel bell mouth is different relative to the position of the cutting knife. In order to ensure that the profiling part of the cutting knife bell mouth coincides with the bell mouth of strip steels of different widths, and to ensure the shape of the bell mouth after cutting, the position of the cutting knife is adjusted by the lateral movement of the moving seat to match the bell mouth of strip steels of different widths, so that it can be applied to strip steels of different widths. Among them, the power source of the upper cutting knife 403 is selected as a cylinder, and the downward pressure is stronger and more stable.

[0079] For more details, see again Fig.10A pair of transverse rails 401-1 are provided on the third base 401, and two sliders 401-2 are provided on each of the transverse rails 401-1. The moving seat 402 is fixedly connected to the four sliders 401-2 so that the moving seat 402 can slide transversely on the transverse rails 401-1. The operating handle 401-3 is used to control the transverse position of the moving seat 402. The operating handle 401-3 is fixedly connected to a screw rod, and the screw rod is threadedly connected to a fixed block provided on the third base 401. The end of the screw rod is connected to the moving seat 402 through a bearing. The moving seat 402 can be pushed to move transversely by rotating the operating handle 401-3. It can be understood that the moving seat is a conventional functional mechanism in the field of industrial production. In addition to the implementation provided in this embodiment, those skilled in the art can easily adopt other implementations to realize the moving seat.

[0080] After the strip is cut at the cutting station, a fixed-length strip segment is formed. An additional strip buffer and conveying unit 900 can be provided between the cutting unit 400 and the folding unit 500 to temporarily store the strip segment and convey it to the subsequent station. Fig.12 , a fourth base 901 is arranged in the strip steel buffer and conveying unit 900, the central channel of the fourth base 901 is the conveying channel, a plurality of conveying components 902 are arranged on the fourth base 901 along the conveying channel, and a plurality of limiting wheel groups 903 are arranged on both sides of the conveying channel; wherein, the conveying component 902 includes a lower pressure roller 902-1 and a conveying power roller 902-2, a gap for the strip steel section to pass through is arranged between the lower pressure roller 902-1 and the conveying power roller 902-2, the conveying power roller 902-2 is a power roller, the lower pressure roller 902-1 provides downward pressure and clamps the strip steel section with the conveying power roller 902-2, and uses friction to convey the strip steel section to the rear of the production line, and the limiting wheel group 903 includes a pair of limiting wheels, which are distributed on both sides of the conveying channel, and limit the strip steel section from both sides. By increasing the length of the strip steel buffer and conveying unit 900 and setting a plurality of conveying components 902, the cut strip steel section can be cached here, and power can also be provided for the conveying of the strip steel section.

[0081] The folding unit 500 is used to fold the edge of the strip steel segment. For certain specifications of ferrules, the edge needs to be folded, and the strip steel segment needs to be folded at the folding station. For ferrule products that do not require folding, the strip steel segment does not need to be processed at this station. Fig.13 In the embodiment provided in the present application, the hemming unit 500 includes a fixing assembly 510 and a hemming tool assembly 520. The fixing assembly 510 includes a supporting assembly 511 located below and a pressing assembly 512 located above, which are relatively arranged. A gap is provided between the supporting assembly 511 and the pressing assembly 512 for passing the strip steel section. Fig. 9After the strip steel segment enters the folding station, it is clamped by the fixing assembly 510. The folding tool assembly 520 includes a folding knife 521 and an actuator 522. The edge of the strip steel segment to be folded is exposed from the fixing assembly 510, and the folding knife 521 pushes the edge upward from bottom to fold the edge. The pressing assembly 512 and the actuator 522 are driven by conventional power equipment such as air cylinders or oil cylinders in industrial production. It should be noted that, see Fig.14 The folding knife 521 is set at an angle, and the movement path of the actuator 522 is also set at an inclined angle with the vertical direction. The overall upward pushing path of the folding knife 521 is to move and push from a position obliquely downward away from the strip steel section to a position obliquely upward close to the strip steel section, which can effectively reduce the resistance of the folding and avoid the rebound of the folding.

[0082] In an optional embodiment, the folding unit 500 also includes a positioning component, which can be a conventional positioning plate, laser positioning device, etc. in industrial production. The steel strip segment is conveyed forward by the conveying mechanism, and the distance of each conveyance is such that each folding portion overlaps with the folding knife, and the folding portion behind does not overlap with the folding knife temporarily. Then the positioning components are distributed in front and behind the folding knife to position the steel strip segment, so that the punching hole on the steel strip segment is aligned with the end of the folding knife. On the other hand, in the embodiment provided by the present application, relative to the total length of the steel strip segment, the length of the folding knife can be set to 1 / 4 or 1 / 2 of the length of the steel strip segment, and each action completes the folding of part of the edge of the steel strip segment. The total length of the steel strip segment is divided into several sections according to the punching holes. The number of foldings each time can be 1 or 2 sections. By conveying the steel strip segment forward in sequence, all the parts of the steel strip segment that need to be folded are folded. On the other hand, in the embodiment provided in the present application, the folding unit 500 also includes a plurality of guide wheel groups arranged on both sides of the strip segment to ensure that the forward direction of the strip remains unchanged during the folding and forward conveying process. Exemplarily, the distance between the guide wheel groups is also adjustable to adapt to strip segments of different specifications and widths.

[0083] The folding unit 500 is provided with a conveying mechanism to convey the strip forward. The conveying distance each time is such that each folding part overlaps with the folding knife, and the rear folding part does not overlap with the folding knife temporarily. Then the front positioning assembly and the rear positioning assembly position the strip in the front and rear positions. There is a supporting assembly under the strip and a pressing assembly above the strip. The pressing assembly presses down to fix the strip. At this time, the folded part of the strip protrudes out of the supporting assembly and the pressing assembly. The folding knife assembly is lifted obliquely upward to push the protruding strip upward to form the strip into a folded shape; then it is conveyed forward in sequence to fold all the parts to be folded. The number of folds each time can be 1 section or 2 sections, which is determined according to the length of the folded strip and the length of the folding knife. The folding unit is also provided with a number of vertically distributed adjustable guide wheels on both sides of the strip. The adjustable guide wheels can ensure that the forward direction of the strip remains unchanged during the folding process.

[0084] The bending unit 600 is used to bend the strip steel segment multiple times to form Fig.15 In the embodiment provided in the present application, see Fig.16 The bending unit 600 includes an inner bending shaft 601 located above the strip steel segment, an outer eccentric bending shaft 602 located below the strip steel segment, and a clamping assembly 603 for clamping the strip steel segment. Fig. 9 The strip section shown is formed after being bent four times Fig.15 The semi-finished ferrule shown is a single-bend ferrule. Fig.17 , the strip steel segment is transported to the bending station, and after advancing a specified size distance, the position to be bent (punching position) of the strip steel segment is set between the inner bending shaft 601 and the outer eccentric bending shaft 602, and the straight part of the strip steel segment at the rear is clamped by the clamping assembly 603. At this time, the inner bending shaft 601 is close to the upper surface of the strip steel segment, and the outer eccentric bending shaft 602 is close to the lower surface of the strip steel segment. The rotation axis of the outer eccentric bending shaft 602 is the central axis of the inner bending shaft 601, that is, the outer The movement mode of the eccentric bending shaft 602 is to rotate around the inner bending shaft 601, and the outer eccentric bending shaft 602 performs a rotation action, driving the part of the strip to be bent to rotate against the inner bending shaft 601, forming an arc shape on the inner bending shaft 601, that is, a rounded corner. After one bending is completed, the strip is transported forward again by a specified size distance, and at the next position to be bent (punching position), it is bent again to form a rounded corner. It should be noted that the angle formed by each two adjacent sides is an obtuse angle, see Figure 17-Figure 19 , and finally formed after four bends Fig.15 In the semi-finished ferrule shown, the two cut surfaces form a certain distance, which is convenient for butt welding.

[0085] In a further embodiment, the clamping assembly 603 in the bending unit 600 includes an upper conveying roller 603-1 and a lower conveying roller 603-2 which are relatively arranged above and below the strip steel section, providing conveying power while limiting the strip steel section from top to bottom; a plurality of vertically distributed adjustable spacing guide wheels 604 are arranged on both sides of the strip steel section to ensure that the forward direction of the strip steel section remains unchanged during the bending process. Exemplarily, the upper conveying roller 603-1 is a passive roller, the lower conveying roller 603-2 is an active roller, and the power source of the lower conveying roller is a driving motor, which is connected to the lower conveying roller by a transmission method such as a gear set, a sprocket or a belt for driving.

[0086] The strip steel segment is formed after bending Fig.15 The semi-finished ferrule shown in the figure comprises a left half section 16 and a right half section 17 to be spliced, and the welding unit 700 is used to butt weld the left half section 16 and the right half section 17, see Fig. 20, the welding unit 700 includes a welding station for placing the semi-finished ferrule after bending. For example, the semi-finished ferrule is grasped from the bending station by the robot gripper and then moved to the welding station; a backing plate 701 is arranged at the rear of the welding station, a front propulsion assembly 702 is arranged at the front, a left propulsion assembly 703 is arranged on the left side, and a right propulsion assembly 704 is arranged on the right side. A left clamping assembly 705 is arranged corresponding to the left half section 16, and a right clamping assembly 706 is arranged corresponding to the right half section 17; an intermediate positioning plate assembly 707 is arranged corresponding to the position between the left half section and the right half section; wherein, the front propulsion assembly 702 is a forward and backward moving mechanism, which is used to push the semi-finished ferrule to make it rest against the backing plate 701; The intermediate positioning plate assembly 707 includes a positioning plate that can be moved up and down, extending or withdrawn from the slit of the frame below the welding station, and initially extending to between the left half section 16 and the right half section 17 for positioning; the left pushing assembly 703 is located on the left side of the semi-finished hoop, and is a left-right moving mechanism. For the semi-finished hoop that has not been spliced, the left pushing assembly 703 is used to push the left half section 16 so that the cut surface (the edge to be spliced) abuts against the positioning plate; the left clamping assembly 705 includes a left supporting member located below the left half section 16 and a left lower pressing member located above the left half section 16. After the cut surface (the edge to be spliced) of the left half section 16 abuts against the positioning plate, the left lower pressing member presses down and cooperates with the left supporting member to clamp the left half section 16 (to simplify the left Half-section fixing process, for ferrules with different bandwidths and different specifications, the left half section is set to be the same length); the right pushing component 704 is located on the right side of the semi-finished ferrule and is a left-right moving mechanism. When the left half section 16 abuts against the positioning plate, the right pushing component 704 moves toward the center, pushing the right half section 17 so that the cut surface (the edge to be spliced) abuts against the positioning plate, and then the positioning plate moves downward and withdraws, and the right pushing component 704 continues to push the cut surface of the right half section 17 (the edge to be spliced) to be spliced ​​with the cut surface of the left half section 16 (the edge to be spliced); the right clamping component 706 includes a right supporting member located below the right half section 17 and a right lower pressing member located above the right half section 17. After the surfaces are spliced, the right lower pressure piece is pressed down to cooperate with the right support piece to clamp the right half section 17. At this time, the semi-finished sleeve is completely fixed and is in a state to be welded; the welding unit 700 also includes a welding gun assembly 708, and the welding gun assembly 708 includes an up-down, front-to-back double-degree-of-freedom moving mechanism and a welding gun arranged on the up-down, front-to-back double-degree-of-freedom moving mechanism. For the semi-finished sleeve that has been spliced ​​and completely fixed, the welding gun moves forward, and the welding gun head approaches the splicing seam to weld the splicing seam of the sleeve. The welding gun moves forward and backward while moving up and down. The welding gun head always moves in accordance with the cross-sectional shape of the strip after profiling to ensure that the distance between the welding gun head and the splicing seam does not change or changes slightly, thereby improving the welding quality of the weld. After welding is completed, the welding gun withdraws backward.

[0087] For example, the front propulsion assembly 702, the left propulsion assembly 703 and the right propulsion assembly 704 are similar in structure, and are all a drive and push plate structure. The action setting of such a structure is easy to implement for those skilled in the art. The welding gun assembly 708 includes a front and rear moving member 708-1, a lifting member 708-2 and a welding gun 708-3, see Fig.21 The welding gun 708-3 is arranged on the lifting member 708-2, and the lifting member 708-2 is arranged on the front-rear moving member 708-1. The front-rear moving member 708-1 and the lifting member 708-2 jointly realize that the welding gun 708-3 moves up and down while moving forward and backward, so that the welding gun 708-3 can always weld the joint seam of the sleeve close to the cross-sectional shape. Furthermore, the welding gun assembly 708 also includes a left and right adjusting member 708-4, and the front-rear moving member 708-1 is arranged on the left and right adjusting member 708-4. The left and right adjusting member 708-4 is set to a manual adjustment structure. The on-site workers can align the welding gun with the joint seam by adjusting the left and right. For the production line of the same product, only one adjustment is required; it can be understood that the front-rear moving member 708-1 and the lifting member 708-2 such moving mechanisms can usually be driven by a motor or a cylinder. For the field of industrial production, it is easy for technicians in this field to adjust the driver and specific parameters according to the specific motion path to be achieved. The intermediate positioning plate assembly 707 includes a positioning plate 707-1 and a lifting cylinder 707-2 for driving the positioning plate 707-1 to rise and fall, see 22. Initially, the positioning plate 707-1 extends out from the slit on the frame, and is withdrawn under the drive of the lifting cylinder 707-2 after positioning is completed.

[0088] After the semi-finished ferrule is welded, it forms a complete ferrule. For the ferrule that does not need rivets, it is already a finished product. For the ferrule that needs rivets, it is necessary to use the rivet welding unit 800 to add rivets to the ferrule; see Fig.23 The rivet welding unit 800 includes a three-dimensional moving truss 810 composed of a lateral moving mechanism, a longitudinal moving mechanism and a vertical moving mechanism, a rivet welding assembly 820 arranged below the three-dimensional moving truss 810, a conveying frame 830, and a hoop fixing assembly 840 arranged on the conveying frame 830; see Fig.24 The rivet welding assembly 820 includes a rotating seat 821 and a rivet feeding assembly 822 and a rivet welding clamp assembly 823 arranged below the rotating seat 821. The rivet feeding assembly 822 includes a rivet material bin 822-1 and a rivet outlet 822-2. Fig.25A rivet clamp 822-3 that moves up and down is provided at the rivet outlet 822-2. For example, in the embodiment of the present application, the rivet clamp 822-3 is configured as an electromagnetic clamp that absorbs the rivet by electromagnetic force; the rivet clamp 822-3 moves upward to the rivet outlet 822-2, absorbs the rivet and then moves downward to send the rivet to the rivet welding clamp assembly 823. The rivet welding clamp assembly 823 includes a relatively arranged movable electrode 823-1, a fixed electrode 823-2 and a driver 823-3 that drives the movable electrode 823-1 to move closer to the fixed electrode 823-2. The rivet is sent by the rivet clamp 822-3 To the fixed electrode, the three-dimensional movable truss 810 moves to make the rivet close to the inside of the hoop, and the movable electrode 823-1, driven by the driver 823-3, cooperates with the fixed electrode 823-2 to clamp the hoop and the rivet from the outside of the hoop, and welding is performed based on resistance welding (current is passed through the two electrodes, so that a large amount of heat is generated at the clamping position to melt the rivet and hoop at this position). After welding is completed, the movable electrode 823-1 is reset, and the rivet clamp 822-3 releases the rivet, and the rotating seat 821 cooperates with the three-dimensional movable truss 810 to move the rivet welding clamp assembly 823 to other rivet welding positions, and continue feeding and welding, and weld all rivets in place in sequence.

[0089] Exemplarily, the driver 823-3 is a driving cylinder that pushes the movable electrode 823-1 to move closer to or away from the fixed electrode 823-2, or the driver 823-3 is a driving motor that is connected to the movable electrode 823-1 through a swing arm to rotate and drive the movable electrode 823-1 to move closer to or away from the fixed electrode 823-2. In an optional embodiment, a vibrating feeding tray can also be used instead of the rivet bin 822-1.

[0090] In a further embodiment, the ferrule fixing assembly 840 disposed on the conveying frame 830 includes a plurality of baffles and a plurality of movable clamping members disposed on the conveying frame 830. The ferrule moves on the conveying frame 830, and is first guided to the welding station by the baffle, and then clamped by the clamping member. Exemplarily, at least one baffle perpendicular to the conveying direction is included to define the location of the welding station, and a pair of clamping members are disposed in the vertical direction of the baffle. After the ferrule enters the welding station, the clamping members abut against and clamp the ferrule from both sides, so that the ferrule can remain square, which is convenient for riveting and welding operations. In an optional embodiment, the clamping member can also be configured as an electromagnetic member to fix the position of the ferrule by magnetic force.

[0091] It is understandable that a large number of action mechanisms are used in the embodiments of the present application. For the field of industrial production, it is a conventional technology to realize various actions such as lateral movement, three-dimensional movement, rotation, etc. It is easy for those skilled in the art to provide other similar action mechanisms for replacement according to the target action or required action. In addition, the power source for driving the action mechanism can be either a motor or a common power source such as a cylinder or a hydraulic cylinder. It is easy to think of and replace the specific action mechanism by connecting various transmission structures such as screw rods, synchronous belts, and gear sets through the power source. For example, for translation and lifting movement, it can be a single-axis linear drive structure; for the rotating structure, it can be a motor drive, or a cylinder drive arm to rotate. The guiding structure of the action mechanism includes but is not limited to linear slides, linear bearings with shafts, dovetail grooves, grooves, etc. It is easy for those skilled in the art to select and replace according to the specific scenario.

[0092] It can be understood that the embodiments of the present application provide various processing units, and the strip or strip segments are transmitted or transferred between the units. Conventional conveying methods such as conveyor racks and conveyor belts can be used, or transfer methods such as robotic arms, transfer trusses, and multi-axis robots can be used. Manual transfer by production personnel is not restricted.

[0093] The ferrule production line provided in the embodiment of the present application can solve the production process of strip steel of different widths, different sizes, ferrules with folded edges and ferrules without folded edges. The ferrules with folded edges are produced by the process of strip steel uncoiling, straightening, profiling, corner cutting, punching, cutting, caching and conveying, folding, bending, butt welding and riveting. The ferrules without folded edges are produced by the process of strip steel uncoiling, straightening, profiling, cutting, caching and conveying, bending and butt welding. The production line can adapt to strip steel of different widths and produce ferrules of various specifications by switching the profiling rollers and adjusting the strip steel limit. The process is fully streamlined. It only needs to manually load the strip steel, install the rivets, and stack the produced products. The remaining processes are basically automated.

[0094] The products produced by the ferrule production line provided in the embodiment of the present application have high dimensional accuracy, good weld quality, and beautiful appearance. The equipment production efficiency is improved compared with traditional manual production, and the number of special types of welders is reduced, which reduces personnel costs, improves the working environment, reduces the labor intensity of operators, and enhances the factory's ability to produce products of multiple specifications and models; it can realize the profiling of strip steel of various widths, the bending of ferrules of various specifications, the option of folding or not folding, the option of welding rivets or not welding rivets, automatic profiling, cutting, folding and bending of ferrules, automatic welding of ferrules, and automatic welding of rivets, which realizes the automated production of ferrules of multiple specifications and types, improves product quality and dimensional accuracy, reduces labor costs, improves production efficiency, reduces labor intensity, and improves the working environment.

[0095] The above is only a preferred embodiment of the present application, and is not any formal or substantial limitation to the present application. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the present application, and these improvements and supplements should also be regarded as the protection scope of the present application. Any technician familiar with this profession, without departing from the content and scope of the present application, can make some changes, modifications and evolutions of the technical content disclosed above, which are equivalent embodiments of the present application; at the same time, any changes, modifications and evolutions of any equivalent changes made to the above-mentioned implementation methods based on the substantial technology of the present application are still within the scope of the technical solution of the present application.

Claims

1. A square pile hoop production line, characterized in that: include A straightening and profiling unit, wherein the straightening and profiling unit is provided with a straightening station and a profiling station, and the strip steel is straightened and profiled through the straightening station and the profiling station; A cutting unit, wherein the cutting unit is provided with a cutting station, and the strip steel is cut to a fixed length by the cutting station to form a strip steel segment; A bending unit, wherein the bending unit is provided with a bending station, and the strip steel section is subjected to multiple bending strokes of the semi-finished product hoop at the bending station; The welding unit is provided with a welding station, and the semi-finished ferrule is welded into one piece by the welding station to form a finished ferrule.

2. A square pile hoop production line according to claim 1, characterized in that: The straightening and profiling unit includes a guiding assembly, a straightening assembly and a profiling assembly; the profiling assembly includes a plurality of profiling roller groups, the profiling roller group includes an upper profiling roller and a lower profiling roller whose outer contour shapes match each other, the upper profiling roller and the lower profiling roller are provided with a gap for the strip to pass through, and the profiling shape of the profiling roller group is defined by the outer contour shapes of the upper profiling roller and the lower profiling roller; the profiling shapes of the plurality of profiling roller groups gradually change to a preset shape, and the flat-shaped strip is formed into a preset shape after being gradually profiling by the plurality of profiling roller groups in sequence.

3. A square pile hoop production line according to claim 1, characterized in that: A corner cutting unit and a punching unit are also provided between the straightening and profiling unit and the cutting unit; the corner cutting unit is provided with a corner cutting station, and the strip is cut at a first preset position by the corner cutting station to form a corner cutting notch; the punching unit is provided with a punching station, and the strip is punched at a second preset position by the punching station.

4. A square pile hoop production line according to claim 1, characterized in that: The cutting unit includes a third base, a movable base, an upper cutting knife and a lower cutting knife, wherein the upper cutting knife and the lower cutting knife are both arranged on the movable base, and the movable base is arranged on a transverse track on the third base; it also includes an operating handle for adjusting the transverse position of the movable base; the upper cutting knife and the lower cutting knife are arranged as contoured cutting blades, one side of which is similar to the cross-sectional shape of the strip to be cut, and the other side forms a flared opening.

5. A square pile hoop production line according to claim 1, characterized in that: A folding unit is also provided between the cutting unit and the bending unit. The folding unit is provided with a folding station, and the edge of the strip steel section is folded at the folding station.

6. A square pile hoop production line according to claim 5, characterized in that: The folding unit includes a fixed component and a folding tool component; the fixed component includes a supporting component located below and a pressing component located above which are relatively arranged, and a gap is arranged between the supporting component and the pressing component for passing the strip steel section; the folding tool component includes a folding knife and an actuator, and the edge of the strip steel section to be folded is exposed from the fixed component, and the folding knife pushes the edge from bottom to top to fold the edge; the folding knife is arranged at an angle, and the movement path of the actuator is arranged at an inclined angle with the vertical direction, and the upward pushing path of the folding knife is arranged to move and push from a position obliquely below away from the strip steel section to a position obliquely above close to the strip steel section.

7. A square pile hoop production line according to claim 1, characterized in that: The bending unit comprises an inner bending shaft located at the top, an outer eccentric bending shaft located at the bottom, and a clamping assembly for clamping the strip steel segment; the rotation axis for the outer eccentric bending shaft to perform the rotation action is set as the central axis of the inner bending shaft.

8. A square pile hoop production line according to claim 1, characterized in that: The welding unit includes a welding station for placing the semi-finished hoop after bending, and the semi-finished hoop includes a left half and a right half to be welded; a back plate is provided at the rear of the welding station, a front propulsion assembly is provided at the front, a left propulsion assembly is provided on the left side, and a right propulsion assembly is provided on the right side; a left support assembly is provided below the left half and a left lower pressure assembly is provided above the left half, a right support assembly is provided below the right half and a right lower pressure assembly is provided above the right half, and an intermediate positioning plate assembly is provided between the left and right halves; and a movable welding gun assembly corresponding to the joint seam between the left and right halves is also provided.

9. A square pile hoop production line according to claim 8, characterized in that: The steps of performing the welding operation by the welding unit include: Step 1: The left and right halves of the semi-finished ferrule to be welded are placed downward on the welding station, and the front push assembly pushes the semi-finished ferrule against the rear support plate; Step 2: Move the middle positioning plate assembly between the left half and the right half; Step 3: The left pushing assembly pushes the cut surface of the left half section against the middle positioning plate, and the left pressing assembly presses down and clamps the left half section with the left supporting assembly; Step 4: The right pushing assembly pushes the cut surface of the right half section against the middle positioning plate, the middle positioning plate assembly moves out, the right pushing assembly continues to push the cut surface of the right half section against the cut surface of the left half section, the right pressing assembly presses down and clamps the right half section with the right supporting assembly; Step 5: Move the welding gun assembly to the joint seam position, and move the welding gun to weld the joint seam.

10. A square pile hoop production line according to claim 1, characterized in that: It also includes a rivet welding unit, which is provided with a rivet welding station, and the finished hoop is welded with rivets at the rivet welding station; the rivet welding unit includes a three-dimensional movable truss, a rivet welding assembly arranged on the three-dimensional movable truss, a conveyor frame and a hoop fixing assembly arranged on the conveyor frame; the rivet welding assembly includes a rotating seat and a rivet feeding assembly and a rivet welding clamp assembly arranged below the rotating seat, the rivet feeding assembly includes a rivet material bin and a rivet discharge port, a rivet clamp that moves up and down is provided at the rivet discharge port, the rivet welding clamp assembly includes a movable electrode, a fixed electrode and a driver that drives the movable electrode to move closer to the fixed electrode, and the rivet clamp moves back and forth at the rivet discharge port and the fixed electrode.

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