Automatic double-end folding machine

Abstract

The invention relates to the technical field of pipeline piece production, in particular to an automatic double-head folding machine which comprises a lathe bed, a straightening blanking module, a flaring module, a tooth row feeding module, an overturning feeding module and a pipe folding and bending module, and the straightening blanking module comprises a straightening mechanism, a traction feeding mechanism and a cutting mechanism. The device is used for straightening and fixed-length cutting of pipes. The flaring module is composed of a fixed flaring mechanism and a movable flaring mechanism, and the flaring position is adjusted according to the pipe length. The tooth row feeding module adopts a plurality of groups of tooth row mechanisms to realize accurate feeding; the overturning feeding module drives a clamping mechanism through an overturning shaft to achieve overturning of a pipe fitting from a tooth row feeding position to a pipe folding and bending position, the pipe folding and bending module comprises a first bending mechanism, a pipe bending mechanism and a middle machine head mechanism, initial bending is completed through the first bending mechanism, then multi-angle forming is conducted through the pipe bending mechanism, and through cooperation with the clamping and rotating functions of the middle machine head mechanism, the pipe fitting can be folded and bent. And finally, a complex three-dimensional pipeline structure is formed, and full-automatic and high-precision forming of pipe fitting machining is achieved.

Description

Technical Field

[0001] This invention relates to the field of pipeline component manufacturing technology, and in particular to an automatic double-head folding machine. Background Technology

[0002] In the traditional production process of refrigerator door liner tubing components, a method of manual tubing bending using multiple people in collaboration is commonly employed. This method has the following significant drawbacks: (1) Manual operation makes it difficult to ensure the consistency of bending angle and curvature. Different workers have different operating techniques. There is a lack of accurate measurement and positioning methods, and the deformation of pipe fittings is difficult to control accurately. (2) It requires multiple people to work together, resulting in high labor costs, long transition time between processes, long production cycle for a single piece, and limited production capacity due to the skill level of the workers. (3) The manual pipe bending platform occupies a large area, requires additional space for material stacking, and has a long logistics route between processes; This production method can no longer meet the requirements of modern manufacturing for product quality, production efficiency and cost control, and there is an urgent need to improve production levels through automation. Summary of the Invention

[0003] The technical problem to be solved by this invention is to address the problems of low precision, poor consistency, high labor costs, low efficiency, and large footprint of the existing technology mentioned above. This invention provides an automatic double-head folding machine that achieves fully automated processing of pipes through modular design and a high-precision transmission structure. It has advantages such as high precision, high efficiency, and flexibility, and is suitable for the mass production of complex three-dimensional pipelines.

[0004] The technical solution adopted by this invention to solve its technical problem is: an automatic double-head folding machine, including a bed and, from the inside out, a straightening and unloading module, a flaring module, a toothed feeding module, a flipping feeding module, and a folding and bending module. The straightening and unloading module includes a straightening mechanism, a traction feeding mechanism, and a cutting mechanism; the flaring module includes a fixed flaring mechanism installed at one end of the bed and a movable flaring mechanism that moves back and forth along the bed to adjust the flaring position according to the product length; the toothed feeding module includes multiple sets of toothed feeding mechanisms; the flipping feeding module includes a flipping shaft and multiple flipping clamping mechanisms located on the flipping shaft and rotating with it; the folding and bending module includes a first bending mechanism, a bending mechanism, and an intermediate head mechanism. The straight pipe fed by the flipping feeding module is first initially bent by the first bending mechanism, then bent at multiple angles by the bending mechanism, and then clamped and rotated by the intermediate head mechanism to form a three-dimensional structure pipe.

[0005] The straightening mechanism straightens the metal pipes to ensure they are straight and without bends. A traction feeding mechanism, driven by a servo motor, precisely feeds the pipes, which are then cut to a set length by a cutting mechanism, ensuring the accuracy of subsequent processing. A fixed and a moving flaring mechanism are used, allowing the flaring position to be adjusted according to different pipe lengths, adapting to the processing needs of various specifications and improving the equipment's flexibility. Multiple sets of toothed feeders ensure precise pipe feeding, guaranteeing stable transport during processing and preventing deviation or slippage. A flipping shaft and a flipping clamping mechanism flip the pipes from the toothed feeder position to the folding bend position, facilitating dual-head processing, reducing manual intervention, and improving production efficiency. Through the coordinated operation of the initial bending mechanism, the pipe bending mechanism, and the intermediate head mechanism, the initial bending, multi-angle bending, and three-dimensional forming of the pipes are completed, meeting the processing requirements of complex pipeline structures.

[0006] According to one embodiment of the present invention, the first bending mechanism includes a moving component, a rotary drive component, a bending head component, and a height adjustment component. The moving component includes a horizontal thrust cylinder and a mounting frame connected to the piston rod of the horizontal thrust cylinder, which can move back and forth along the bed. The rotary drive component and the height adjustment component are both mounted on the mounting frame. The rotary drive component includes a rotary servo motor and a synchronous belt drive component. The bending head component includes a fixed shaft and a rotating disk driven by the synchronous belt drive component. The fixed shaft passes through the rotating disk and is connected to a fixed wheel. A guide wheel is connected to the rotating disk to form a bending pipe channel. The height adjustment component includes a first bending lifting cylinder and a lifting frame. The first bending lifting cylinder is mounted on the bottom surface of the mounting frame, and its piston rod is connected to the lifting frame. The top of the lifting frame is provided with a mounting hole for mounting the fixed shaft.

[0007] A horizontal cylinder drives the mounting bracket to move along the machine bed, adjusting the position of the first bending mechanism to meet the space requirements for the first bend and the left and right head bends. Adjusting the guide rail limit positions accommodates production of products of different lengths. A rotary servo motor and synchronous belt drive are used to achieve high-precision rotation control, ensuring consistent bending angles. The cooperation of the fixed axis, rotating disc, fixed rollers, and guide rollers forms a stable bending channel, ensuring that the pipe does not shift or deform during bending. Changing the fixed rollers to different diameters meets the production needs of different pipe diameters or bending radii, improving the equipment's adaptability.

[0008] According to one embodiment of the present invention, the pipe bending mechanism includes a traveling assembly, a pipe bending assembly, a pipe bending radius changing assembly, and a lifting assembly. The traveling assembly includes a traveling base plate and a traveling drive motor mounted on the traveling base plate. The pipe bending assembly is mounted on the traveling base plate via a housing frame and includes a pipe bending drive motor, a transmission gear set, a sleeve shaft, and a pipe bending component. The pipe bending component is disposed on the upper end of the sleeve shaft, and the sleeve shaft is provided with a driven bevel gear of the transmission gear set, which meshes with a driving bevel gear at the output end of the pipe bending drive motor. The pipe bending radius changing assembly includes a pipe bending radius drive motor, a synchronous belt transmission component, an inner shaft, and a changing component. The inner shaft... The upper part extends into the sleeve shaft component, and its upper end is connected to the changing component, while its lower end is connected to the driven pulley of the synchronous belt drive component. The bending radius drive motor is located below the walking base plate, and its output shaft is connected to the driving pulley of the synchronous belt drive component. The lifting assembly includes a first set of lifting cylinders, a second set of lifting cylinders, a first lifting limit plate, and a second lifting limit plate. The first lifting limit plate and the second lifting limit plate are respectively located at the lower part of the sleeve shaft component and the lower part of the inner shaft component. The first set of lifting cylinders is installed on the inner side wall of the box frame, and its piston rod is connected to the first lifting limit plate. The second set of lifting cylinders is installed on the bottom plate of the box frame, and its piston rod is connected to the second lifting limit plate.

[0009] The bending mechanism is driven by a travel drive motor to move along the machine bed, adjusting the bending position to adapt to different bending requirements. It employs a bending drive motor, transmission gear set, sleeve shaft, and bending components to achieve precise bending of the tube, ensuring consistency in angle and curvature. The position of the changing component is adjusted by a bending radius drive motor and synchronous belt transmission, enabling rapid switching between different bending radii. Two sets of lifting cylinders control the height of the sleeve shaft and inner shaft respectively, ensuring the stability and forming accuracy of the tube during the bending process.

[0010] According to one embodiment of the present invention, a power helical gear is installed on the output shaft of the walking drive motor, and the power helical gear meshes with a helical rack on the bed; a deep groove ball bearing is provided in the top plate of the housing frame, and the sleeve shaft includes a bevel gear connecting sleeve shaft and an outer sleeve shaft. The bevel gear connecting sleeve shaft passes through the inner hole of the deep groove ball bearing and is pressed and fixed by a driven bevel gear. The outer sleeve shaft is connected to the bevel gear connecting sleeve shaft by a pin shaft; a first bearing is provided in the first lifting limit plate, and a first lifting cover plate for pressing the first bearing is provided above the first lifting limit plate. The outer sleeve shaft passes through the inner hole of the first bearing and is pressed and fixed by a tightening nut on the inner ring of the first bearing.

[0011] The walking drive uses helical gears and helical racks to ensure smooth walking and reduce vibration and deviation; the sleeve shaft structure uses deep groove ball bearings to improve the durability of rotating parts and reduce wear; the outer sleeve shaft is fixed by the first bearing and the tightening nut to ensure that no radial deviation occurs during lifting and lowering, thus improving the accuracy of pipe bending.

[0012] According to one embodiment of the present invention, the inner shaft component includes a first inner shaft and a second inner shaft. The lower part of the first inner shaft extends into the through hole of the second inner shaft. The upper end of the first inner shaft has a cross-shaped concave groove. The lower end of the second inner shaft is connected to the driven pulley via a flat key. The driven pulley is mounted on the pulley mounting bracket via a driven pulley fixing shaft. The changing component includes a mold mounting plate and a bending mold. The bottom of the mold mounting plate is milled with a cross-shaped convex groove, which is engaged with the cross-shaped concave groove. A second bearing is provided inside the second lifting limit plate. A second lifting cover plate is provided above the second lifting limit plate to press the second bearing. The second inner shaft passes through the inner hole of the second bearing and is fixed to the second bearing by a shaft clamp. A lifting stop block and an inner shaft stop block are respectively connected to the second inner shaft. A cylindrical pin is mounted on the lifting stop block.

[0013] The design employs a nested structure of a first inner shaft and a second inner shaft, which is connected to the changing parts via a cross-shaped groove to ensure alignment during changing parts. The mold mounting plate features a cross-shaped groove design, facilitating quick replacement of bending molds and improving production efficiency. The second inner shaft is secured by a second bearing and a shaft clip to ensure stability and accuracy during the lifting process.

[0014] According to one embodiment of the present invention, the inner hole of the outer sleeve shaft is provided with a needle roller bearing, and the first inner shaft passes through the inner hole of the needle roller bearing; the bending pipe component includes a sleeve shaft mold mounting ring and an internally threaded cylindrical pin, the sleeve shaft mold mounting ring is connected to the upper end face of the outer sleeve shaft to form a receiving cavity for accommodating the mold mounting plate, and the internally threaded cylindrical pin is connected to the sleeve shaft mold mounting ring.

[0015] Needle roller bearings reduce friction on the first inner shaft and improve rotational smoothness; the sleeve mold mounting ring forms a receiving cavity, which facilitates mold installation and fixation and improves mold change efficiency.

[0016] According to one embodiment of the present invention, the movable flaring mechanism includes a base plate, a drive reduction motor, a cylindrical gear, a flaring advance / retract cylinder, a clamping cylinder, a flaring cylinder, and a flaring guide cylinder. The drive reduction motor is mounted on the base plate, and its output shaft passes through the base plate and is connected to the cylindrical gear, which meshes with a rack on the bed. A linear guide rail is mounted on the base plate, and a slider that moves along the linear guide rail is provided. A housing is connected to the slider, and the piston rod of the flaring advance / retract cylinder is connected to the housing. A fixed clamping block is connected to the top of the housing, and a slot is opened on the fixed clamping block. The clamping cylinder is vertically mounted on the top of the fixed clamping block, and its piston rod is connected to a movable clamping block that extends into the slot. The flaring cylinder is mounted on a flaring cylinder plate, and four guide posts pass through the flaring cylinder plate and the fixed clamping block. A movable plate is slidably arranged on the guide posts, and a flaring needle is mounted on the movable plate. The flaring guide cylinder is mounted on the side wall of the fixed clamping block, and its output end is connected to the flaring guide bell mouth.

[0017] The power of the drive geared motor is transmitted through the meshing of a cylindrical gear and a rack, enabling the movement of the flaring mechanism to adapt to different pipe length requirements. The flaring advance and retraction cylinder controls the advance and retraction of the flaring needle, ensuring consistent flaring depth. The clamping cylinder secures the pipe using fixed and movable clamping blocks to prevent pipe misalignment during flaring. The flaring cylinder and the flaring guide cylinder work together to complete the flaring action, ensuring the accuracy and consistency of the flared shape.

[0018] According to one embodiment of the present invention, the piston rod of the flaring cylinder is connected to a movable cylinder flange, which is connected to the housing; a lower clamping insert is fixed on the bottom surface of the slot of the fixed clamping block, and an upper clamping insert is connected to the bottom surface of the movable clamping block; a semi-circular arc groove is provided on the bottom surface of the upper clamping insert and the top surface of the lower clamping insert; a stop block is connected to the side of the movable clamping block facing the flaring cylinder, the stop block being in the shape of a "7" and composed of a transverse part and a longitudinal part, the longitudinal part having a central clearance hole for the flaring needle to extend into; the piston rod of the flaring cylinder passes through the flaring cylinder plate and is connected to the flaring cylinder flange, which is connected to the movable plate.

[0019] The movable cylinder flange enhances the connection stability of the flaring cylinder and reduces vibration; the upper and lower clamping inserts adopt a semi-circular arc groove design to ensure that the pipe is firmly clamped and avoids surface damage; the stop block and the central clearance hole guide the flaring needle to accurately enter the center of the pipe, improving the flaring quality.

[0020] According to one embodiment of the present invention, the toothed rack mechanism includes a fixed component, a movable component, and a feeding cylinder. The fixed components of multiple toothed rack mechanisms are connected by tie rods. The tops of the fixed component and the movable component are inclined surfaces and both are provided with serrated grooves. The serrated grooves of the two are staggered on the vertical projection plane. A bearing is installed on one side wall of the fixed component. A strip hole for the bearing to extend into is provided on the movable component. The movable component is connected to the piston rod of the feeding cylinder through a connecting plate. The feeding cylinder is installed on the bed. A aligning cylinder is provided at one end of the toothed rack feeding module near the flip feeding module.

[0021] The fixed and moving parts are staggered by a serrated groove design to achieve step-by-step conveying of the pipe and avoid slippage; the feeding cylinder drives the moving part to ensure the accuracy of the feeding stroke; the alignment cylinder aligns the pipe at the end of the feeding process to ensure the positioning accuracy of subsequent processing.

[0022] According to one embodiment of the present invention, the flipping clamping mechanism includes a flipping frame base, a flipping bearing seat, a flipping arm, and a flipping clamping cylinder. The flipping frame base is fixed to the bed, the flipping bearing seat is mounted on the flipping frame base, one end of the flipping arm is sleeved on the flipping shaft and located close to the flipping bearing seat, and the other end of the flipping arm is equipped with a flipping clamping cylinder. The output end of the flipping clamping cylinder is connected to a clamping finger with a V-groove.

[0023] The bearing housing and tilting arm ensure the smoothness and accuracy of the tilting process; the tilting clamping cylinder firmly clamps the pipe with V-groove fingers to prevent it from loosening during the tilting process.

[0024] The beneficial effects of the present invention: The automatic double-head folding machine of the present invention achieves fully automated control of the tube bending process through servo motor drive, precision transmission mechanism and high-precision positioning system; The straightening and unloading module employs mechanical straightening and automatic cutting to ensure the straightness and length consistency of the pipe in its initial state; the first bending mechanism and the pipe bending mechanism use servo motors with synchronous belts or gear drives, combined with programmable control, to control the bending angle and arc error within ±0.5°; the flaring module uses a cylinder and guide post guiding structure to ensure the standardization of flaring depth and shape; the flipping feeding and toothed feeding modules use cylinders and toothed racks for positioning to ensure precise alignment of the pipe during processing; Straightening, cutting, flaring, feeding, bending, and flipping are all completed on one machine, reducing material turnaround time. The flipping feeding module enables automatic pipe feeding, eliminating the need for manual intervention at both ends. The bending radius changing component and modular mold design can complete product specification switching within 2 minutes, adapting to small-batch, multi-variety production. The toothed feeding mechanism uses staggered tooth stepping propulsion, combined with a aligning cylinder, to ensure accurate pipe positioning and improve feeding speed. All modules are arranged linearly along the bed, reducing the floor space required; the moving flaring mechanism moves freely on the bed via gears and racks, adapting to different pipe lengths without additional workstations; the pipe is automatically conveyed from adjustment to forming, eliminating material accumulation problems between processes.

[0025] The first bending mechanism, the pipe bending mechanism, and the intermediate head mechanism work together to complete multi-angle bending in space; the changing parts adopt cross slot positioning, and the mold replacement does not require calibration, adapting to different pipe diameters and bending radius requirements; parameters can be preset through PLC programming, and product models can be switched with one click, which can meet customized needs such as refrigerator door liner piping. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Figure 1 This is a schematic diagram of the structure of the refrigerator door liner tubing component to be processed according to the present invention.

[0028] Figure 2 yes Figure 1 Side view.

[0029] Figure 3 yes Figure 2 A magnified structural diagram at point I.

[0030] Figure 4This is a structural schematic diagram of the automatic double-head folding machine of the present invention.

[0031] Figure 5 yes Figure 4 Top view.

[0032] Figure 6 This is a schematic diagram of the moving flaring mechanism in the automatic double-head folding machine of the present invention.

[0033] Figure 7 yes Figure 6 A schematic diagram of the structure from another direction.

[0034] Figure 8 yes Figure 6 A schematic diagram of the forward and backward drive component.

[0035] Figure 9 yes Figure 6 A schematic diagram of the clamping assembly.

[0036] Figure 10 yes Figure 6 A schematic diagram of the structure of the flared execution component.

[0037] Figure 11 yes Figure 6 A schematic diagram of the structure of the center guide positioning component.

[0038] Figure 12 This is a schematic diagram of the toothed feeding module in the automatic double-head folding machine of the present invention.

[0039] Figure 13 yes Figure 12 A schematic diagram of the middle gear rack mechanism.

[0040] Figure 14 yes Figure 13 Exploded view.

[0041] Figure 15 This is a schematic diagram of the flipping and feeding module in the automatic double-head folding machine of the present invention.

[0042] Figure 16 yes Figure 15 A schematic diagram of the structure of the in-middle tilting clamping mechanism.

[0043] Figure 17 This is a schematic diagram of the first bending mechanism in the automatic double-head folding machine of the present invention.

[0044] Figure 18 yes Figure 17 A schematic diagram of the structure from another direction.

[0045] Figure 19 yes Figure 17 A schematic diagram of the structure of the height adjustment component.

[0046] Figure 20 yes Figure 17 Installation diagram of the rotary drive assembly and the elbow assembly.

[0047] Figure 21 This is a schematic diagram of the tube bending mechanism in the automatic double-head folding machine of the present invention.

[0048] Figure 22 This is a schematic diagram of the walking component in this invention.

[0049] Figure 23 yes Figure 22 A schematic diagram of the structure from another direction.

[0050] Figure 24 yes Figure 22 A schematic diagram of the structure of the middle bend pipe assembly.

[0051] Figure 25 yes Figure 24 Exploded view.

[0052] Figure 26 yes Figure 24 A schematic diagram of the structure of the mid-bend pipe radius conversion component.

[0053] Figure 27 yes Figure 26 Exploded view.

[0054] Figure 28 yes Figure 26 A schematic diagram of the lifting assembly.

[0055] Figure 29 yes Figure 28 Exploded view.

[0056] Figure 30 yes Figure 4 A magnified structural diagram of section II.

[0057] In the diagram: 1. Bed; 2. Straightening and unloading module; 3. Flaring module; 31. Fixed flaring mechanism; 32. Moving flaring mechanism; 321. Base plate; 322. Drive geared motor; 323. Cylindrical gear; 324. Flaring advance / retreat cylinder; 325. Housing; 326. Linear guide rail; 327. Slider; 328. Moving cylinder flange; 329. Fixed clamping block; 3210. Movable clamping block; 3211. Clamping cylinder; 3212. Lower clamping insert; 3213. Upper clamping insert; 3214. Flaring cylinder; 3215, Movable plate; 3216, Flaring needle; 3217, Flaring cylinder plate; 3218, Guide post; 3219, Flaring cylinder flange; 3220, Flaring guide cylinder; 3221, Flaring guide flare; 32211, Upper flare block; 32212, Lower flare block; 3222, Guide cylinder mounting plate; 3223, Stop block; 32231, Horizontal part; 32232, Longitudinal part; 322321, Central clearance hole; 4. Toothed feeding module; 41. Toothed mechanism; 410. Serrated groove; 411. Fixing component; 412. Feeding cylinder; 413. Moving component; 4131. Strip hole; 414. Tie rod; 416. Shim; 417. Gap adjusting piece; 418. Connecting plate; 43. Alignment cylinder; 44. Alignment cylinder seat; 5. Tilting feeding module; 51. Tilting shaft; 52. Tilting clamping mechanism; 521. Tilting servo motor; 523. Tilting clamping component; 5231. Rotating arm; 5232. Tilting clamping cylinder; 52321. Clamping finger; 523211. V-groove; 5233. Clamping flange; 5234. Material guide sheet metal; 6. Folding and bending module; 61. First bending mechanism; 611. Horizontal push cylinder; 612. Mounting bracket; 613. Cylinder seat mounting base plate; 614. First slider; 615. Second slider; 616. Vertical guide rail; 617. Third slider; 618. First bending lifting cylinder; 619. Lifting frame; 6110. Slider mounting plate; 6111. Lifting base plate; 6112. Rotary servo motor; 6113. Active synchronous pulley; 6114. Driven synchronous pulley; 6115. Fixed axis; 6116. Rotating disk; 6117. Fixed axis cover plate; 6118. Fixed wheel; 6119. Spacer ring; 6120. Support wheel; 6121. Base plate; 6122. Mounting base plate; 6123. Mounting side plate; 6124. Bending platform; 61241. Clearance hole; 62. Pipe bending mechanism; 621. Traveling assembly; 6211. Traveling base plate; 6212. Traveling drive motor; 6214. Power helical gear; 622. Housing frame; 6221. Deep groove ball bearing; 623. Pipe bending assembly; 6231. Pipe bending drive motor; 6232. Transmission gear set; 62321. Driving bevel gear; 62322. Driven bevel gear; 6233. Sleeve shaft; 62331. Bevel gear connecting sleeve shaft; 62332. Outer sleeve shaft; 62333. Needle roller bearing; 6234. Pipe bending component; 62341. Sleeve shaft mold mounting ring; 62342. Internal threaded cylindrical pin; 624. Pipe bending radius changing assembly; 6241. Pipe bending radius drive motor; 6242. Synchronous belt transmission component; 62421. Driving pulley; 62422. Driven pulley; 62423. Pulley mounting plate Mounting bracket; 62424, Synchronous belt; 62425, Driven pulley fixed shaft; 6243, Inner shaft component; 62431, First inner shaft; 624311, Cross-shaped concave groove; 62432, Second inner shaft; 62433, Lifting stop; 62434, Inner shaft stop; 6244, Changing part; 62441, Mold mounting plate; 624411, Cross-shaped convex groove; 62442, Bend Mold; 625, Lifting assembly; 6251, First lifting cylinder; 6252, Second lifting cylinder; 6253, First lifting limit plate; 62531, First bearing; 6254, Second lifting limit plate; 6255, First lifting cover plate; 6256, Tightening nut; 6257, Second bearing; 6258, Second lifting cover plate; 626, Rotary pressing cylinder; 6261, Pressing block; 63. Intermediate head mechanism; 631. Intermediate clamping cylinder; 632. Rack and pinion push cylinder; 633. Notched gear; 634. Limit block. Detailed Implementation

[0058] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0059] like Figure 1 and Figure 2 As shown, the refrigerator door liner tubing needs to be bent into hook shapes at both ends. Near these hooks, a small bend in the same direction is required, meaning all bends are acute angles. A bend is also needed in the middle of the tubing; this section involves bends in two directions. Figure 3 As shown, the bending angle in one direction is an acute angle, and the bending angle in the other direction is an obtuse angle.

[0060] For such pipe fittings, traditional processes require four independent workstations. Each transfer introduces positioning errors, which accumulate and increase over time. Furthermore, the lack of mandrel support during transport causes deformation of bent sections. Each workstation requires 1-2 operators, resulting in significant production time per piece, while the workers' consistency in clamping complex pipe fittings can only reach 65%. Especially in cases like... Figure 3 The diagram shows a bidirectional bend in the middle (acute angle + obtuse angle combination). Traditional pipe bending machines can only achieve bending in a single plane. After the first acute angle bend is completed, the spatial posture of the pipe has changed. When performing the second obtuse angle bend, manual operation relies on the worker's experience to adjust the position of the pipe, but it is difficult to guarantee the relative angle accuracy of the two bends.

[0061] To ensure the mass production of complex three-dimensional pipelines like those described above, such as Figure 4 and Figure 5 As shown, this embodiment provides an automatic double-head folding machine, including a bed 1 and, from the inside out, a straightening and unloading module 2, a flaring module 3, a toothed feeding module 4, a flipping feeding module 5, and a folding and bending module 6, all arranged sequentially on the bed 1. The straightening and unloading module 2 includes a straightening mechanism, a traction feeding mechanism, and a cutting mechanism (not shown in the figure, but commonly found in existing pipe processing equipment). The flaring module 3 includes a fixed flaring mechanism 31 installed at one end of the bed 1 and a movable flaring mechanism 32 that moves back and forth along the bed 1 to adjust the flaring position according to the product length. The toothed feeding module 4 includes multiple sets of toothed mechanisms 41. The flipping feeding module 5 includes a flipping shaft 5. 1 and multiple flipping clamping mechanisms 52 located on the flipping shaft 51 and rotating with it; the folding and bending module 6 includes a first bending mechanism 61 (including a left first bending mechanism and a right first bending mechanism located at both ends of the bed 1 with the same structure), a bending mechanism 62 (also including a left bending mechanism and a right bending mechanism with the same structure, located between the left first bending mechanism and the right first bending mechanism), and an intermediate head mechanism 63 (located between the left bending mechanism and the right bending mechanism). The straight pipe fed by the flipping feeding module 5 is first bent by the first bending mechanism 61, then bent at multiple angles by the bending mechanism 62, and clamped and rotated by the intermediate head mechanism 63 to form a three-dimensional structure pipeline.

[0062] Specifically, the straightening and unloading module 2 uses a servo motor and belt traction to achieve precise feeding. After passing through a straightening mechanism and a cutting mechanism, the tubes are cut to a fixed length. Different feeding lengths can be selected according to the product length to adapt to the production of various products. The flaring module 3 is divided into a moving flaring mechanism 32 and a fixed flaring mechanism 31. The moving flaring mechanism 32 is driven by a servo motor to engage gears and racks, causing the moving flaring mechanism 32 to move along the guide rail. The flaring position of the moving flaring mechanism 32 is determined according to the product length. A cylinder is used to clamp the tube, and an adjustable stroke cylinder is used for flaring, enabling the production of products with various flaring lengths. The toothed feeding module 4 uses multiple sets of toothed mechanisms 41 to sequentially pass straight tubes forward to the flipping feeding module 5. The flipping clamping mechanism 52 of the flipping feeding module 5 clamps the straight tube and, driven by a servo motor, rotates it along the rotation axis to the receiving sheet metal of the folding and bending module 6. The left and right bending mechanisms 62, the middle head mechanism 63, and the left and right first bending mechanisms 61 together form the folding and bending section of the pipeline. When the straight pipe falls to the receiving sheet metal part of the folding and bending module 6, the left and right first bending mechanisms 61 first bend the pipe at both ends. After completion, they move to the bending position, and the left and right bending mechanisms 62 bend the pipe at the same time. The middle head mechanism 63 clamps and drives the pipe to rotate 90° and 180°. Together with the left and right bending mechanisms 62, the three-dimensional bending function is realized.

[0063] To better understand the structure and operation of each module, the main modules will be described in detail below.

[0064] The fixed flaring mechanism 31 and the movable flaring mechanism 32 of the flaring module 3 are mostly the same in structure, the only difference being that the movable flaring mechanism 32 can move along the bed 1. For example... Figure 6 and Figure 7 As shown, the moving flaring mechanism 32 includes a base assembly, a forward and backward drive assembly, a clamping assembly, a flaring execution assembly, and a guide and positioning assembly. The base assembly includes a base plate 321 and a drive mechanism. The drive mechanism includes a drive reduction motor 322 and a cylindrical gear 323. The drive reduction motor 322 is mounted on the base plate 321, and its output shaft passes through the base plate 321 and is connected to the cylindrical gear 323. The cylindrical gear 323 meshes with a rack on the bed 1.

[0065] like Figure 8 As shown, the forward and backward drive assembly includes a flared forward and backward cylinder 324 and a housing 325. A linear guide rail 326 is mounted on the base plate 321. A slider 327 that moves back and forth along the linear guide rail 326 is provided at the bottom of the housing 325. The piston rod of the flared forward and backward cylinder 324 is connected to a moving cylinder flange 328, which is connected to the housing 325.

[0066] The positioning system composed of the drive geared motor 322 and the cylindrical gear 323 can realize the large-range precise movement of the mechanism on the bed 1 to meet the process requirements of products of different lengths; the flared inlet and outlet cylinder 324 and the linear guide rail 326 constitute a fine adjustment system to provide more precise feed accuracy. This graded drive improves efficiency compared with the traditional single drive method.

[0067] like Figure 9 As shown, the clamping assembly is mounted on the housing 325 and includes a fixed clamping block 329, a movable clamping block 3210, and a clamping cylinder 3211. The clamping cylinder 3211 is vertically mounted on the top of the fixed clamping block 329, and its piston rod is connected to the movable clamping block 3210, which extends into the slot of the fixed clamping block 329. A lower clamping insert 3212 is fixed on the bottom surface of the slot of the fixed clamping block 329, and an upper clamping insert 3213 is connected to the bottom surface of the movable clamping block 3210. Semi-circular arc-shaped grooves are provided on the bottom surface of the upper clamping insert 3213 and the top surface of the lower clamping insert 3212.

[0068] The interchangeable design of the upper clamping insert 3213 and the lower clamping insert 3212 supports the processing of pipe products with different diameters. Combined with the semi-circular arc groove, it ensures that the clamping force is evenly distributed and avoids indentation on the surface of the pipe products.

[0069] like Figure 10 As shown, the flaring actuator includes a flaring cylinder 3214, a movable plate 3215, and a flaring needle 3216. The flaring cylinder 3214 is mounted on the flaring cylinder plate 3217. The piston rod of the flaring cylinder 3214 passes through the flaring cylinder plate 3217 and is connected to the flaring cylinder flange 3219. The flaring cylinder flange 3219 is connected to the movable plate 3215. Four guide posts 3218 pass through the flaring cylinder plate 3217 and the fixed clamping block 329. The movable plate 3215 is slidably mounted on the guide posts 3218. The flaring needle 3216 is mounted on the movable plate 3215. A stop block 3223 is connected to the side of the movable clamping block 3210 facing the flaring cylinder 3214. The stop block 3223 is in the shape of a "7" and is composed of a horizontal part 32231 and a vertical part 32232. A central clearance hole 322321 is provided on the vertical part 32232 for the flaring needle 3216 to extend into.

[0070] The symmetrical arrangement of the four guide pillars 3218 forms a stable kinematic pair, effectively resisting radial force during the flaring process and preventing the flaring pin 3216 from deflecting. The "7"-shaped structure of the stop block 3223 provides axial limitation, and its central clearance hole 322321 also serves as a guide sleeve for the flaring pin 3216, forming a secondary positioning. Combined with the primary positioning of the flaring guide bell mouth 3221, a three-level positioning system is formed, ensuring a flaring depth consistency of 99.7%.

[0071] like Figure 11As shown, the guide positioning assembly includes a flared guide cylinder 3220 and a flared guide horn 3221. A mounting groove is provided on one side of the fixing clamp 329, and a guide cylinder mounting plate 3222 is connected in the mounting groove. The flared guide cylinder 3220 is mounted on the guide cylinder mounting plate 3222 and is perpendicular to the guide cylinder mounting plate 3222. The flared guide cylinder 3220 is a gripper cylinder, and the flared guide horn 3221 is composed of an upper half horn block 32211 and a lower half horn block 32212 connected to the two grippers of the flared guide cylinder 3220.

[0072] The gripper-type flared guide bell mouth 3221 can achieve rapid closure under the drive of the flared guide cylinder 3220. The resulting conical guide channel can guide the pipe product to automatically correct positional errors, which improves the fault tolerance capability compared with the traditional fixed guide sleeve.

[0073] Specific working principle: A base slider is installed on the base plate 321. A drive reduction motor 322 is installed on the base plate 321, and a cylindrical gear 323 is installed on its output shaft. The drive reduction motor 322 rotates, causing the cylindrical gear 323 to mesh with the rack of the bed 1, so that the entire flaring mechanism moves along the guide rail of the bed 1, thereby meeting the production needs of products of different lengths. The upper surface of the base plate 321 is equipped with a linear guide rail 326 for the flaring in / out cylinder 324. The piston rod of the flaring in / out cylinder 324 is connected to the housing 325 through a moving cylinder flange 328, so that the housing 325 and the clamping assembly installed on the housing 325 move forward and backward along the linear guide rail 326 under the action of the flaring in / out cylinder 324, so that the product enters or leaves the flaring mechanism. The top of the housing 325 is provided with a fixed clamping block 329, and the lower clamping insert 3212 is installed on the bottom surface of the groove of the fixed clamping block 329 as a clamping lower mold. A clamping cylinder plate is installed above the fixed clamping block 329 to install the clamping cylinder 3211. A movable clamping block 3210 is installed on the piston rod of the clamping cylinder 3211. The upper clamping insert 3213 is connected below the movable clamping block 3210. Under the action of the clamping cylinder 3211, the upper clamping insert 3213 descends or rises to clamp or release the product. A stop block 3223 is fixed on the side wall of the movable clamping block 3210, which is the limit for the product to be in place. When the clamping cylinder 3211 descends, the stop block 3223 also descends together. The flaring needle 3216 passes through the central clearance hole 322321 of the stop block 3223 to flare the hole.

[0074] Four guide posts 3218 are threaded through the fixed clamping block 329. The other end of the guide posts 3218 passes through the flared cylinder plate 3217. The movable plate 3215 passes through the four guide post holes on it and is threaded onto the four guide posts 3218. The cylinder body of the flared cylinder 3214 is mounted on the flared cylinder plate 3217. The piston rod is connected together through the flared cylinder flange 3219, so that the movable plate 3215 moves along the guide posts 3218 under the action of the flared cylinder 3214. The flaring process is performed by the flaring needle 3216 mounted on the movable plate 3215. The flaring guide cylinder 3220 is fixed in the mounting groove on one side of the fixed clamping block 329. The flaring guide flare 3221 is mounted on the flaring guide cylinder 3220 and opens or closes horizontally with the flaring guide cylinder 3220.

[0075] Depending on the length of the product, the drive reduction motor 322 moves to a suitable position and remains stationary. During flaring, the flaring guide cylinder 3220 first closes, the flaring guide bell mouth 3221 closes to form a guide channel, the flaring advance and retreat cylinder 324 extends, and the housing 325 moves forward, allowing the product (such as an iron pipe) to enter the flaring mechanism. The clamping cylinder 3211 extends to clamp the product, and the flaring cylinder 3214 actuates to flare. After flaring is completed, the flaring cylinder 3214 resets, the flaring guide cylinder 3220 and the clamping cylinder 3211 reset and retract, releasing the flared product. The flaring advance and retreat cylinder 324 retracts, causing the flaring mechanism to detach from the product.

[0076] like Figure 12 As shown, the toothed feeding module 4 has multiple sets of toothed mechanisms 41. Each toothed mechanism 41 includes a fixed component 411 and a movable component 413 that moves up and down driven by a feeding cylinder 412, such as... Figure 13 As shown, all the fixing parts 411 are connected together by the tie rod 414, and the spacing between adjacent fixing parts 411 is equal to ensure the stability and synchronization of pipe conveying. The movable part 413 is slidably installed on the same side of the fixing parts 411, so that the pipe can be accurately positioned during the conveying process. The top of the fixing parts 411 and the movable part 413 is an inclined surface facing the flipping feeding module 5, and both are provided with serrated grooves 410. The serrated grooves 410 of the two are staggered on the vertical projection plane.

[0077] like Figure 13As shown, the fixing member 411 is a plate with through holes at its four corners for the pull rod 414 to pass through. Bearings are installed on the side walls of the fixing member 411. As the core supporting component of the gear mechanism 41, the fixing member 411 adopts a plate structure and has through holes at its four corners, facilitating the passage of the pull rod 414 and connecting all the fixing members 411 in series, ensuring the rigidity and stability of the overall structure. The bearings installed on the side walls support the sliding movement of the moving part 413, reducing frictional resistance and allowing the moving part 413 to move smoothly up and down under the drive of the feeding cylinder 412. This not only simplifies the assembly process but also improves the durability and ease of maintenance of the mechanism. The movable component 413 is a plate with a slotted hole 4131 through which the bearing shaft passes. A shim 416 is connected to the outer end face of the bearing shaft, allowing the movable component 413 to slide up and down relative to the fixed component 411. The diameter of the shim 416 is larger than the width of the slotted hole 4131, effectively limiting the range of motion of the movable component 413 and preventing it from detaching from the fixed component 411, thus ensuring the stability and safety of the movement process. This structure is simple and reliable, capable of withstanding frequent reciprocating motion, and is easy to adjust and maintain. Furthermore, clearance adjustment pieces 417 are provided between the shim 416 and the bearing, as well as on the inner end face of the bearing, for precisely adjusting the clearance between the movable component 413 and the fixed component 411, avoiding movement jamming or loosening problems caused by machining errors or wear. This design significantly improves the motion accuracy and lifespan of the mechanism, making it particularly suitable for automated production lines with strict requirements for feeding positions. A connecting plate 418 is connected to the side wall of the movable part 413. The connecting plate 418 is perpendicular to the movable part 413 and is connected to the end of the piston rod of the feeding cylinder 412, so as to directly transmit the linear motion of the feeding cylinder 412 to the movable part 413, ensuring the efficiency and accuracy of power transmission.

[0078] Specific working principle: When the feeding cylinder 412 is in the retracted state, the movable part 413 is in the low position, and the serrated groove 410 of the fixed part 411 forms a toothed support surface; the pipe is conveyed from the previous process to the serrated groove 410 of the toothed feeding module 4, and the feeding cylinder 412 pushes the movable part 413 to rise. Through the connecting plate 418, all movable parts 413 move upward synchronously, so that the pipe is lifted to the conveying height; when the movable part 413 falls and resets, the serrated groove 410 of the fixed part 411 continues to support the pipe. The step-by-step conveying of the pipe is achieved by alternating lifting and lowering.

[0079] The toothed feeding mechanism 41 has a discharge end aligning cylinder 43. The aligning cylinder 43 is installed near the toothed feeding mechanism 41 via an aligning cylinder seat 44. It can align and position the pipe before it enters the flipping feeding module 5, ensuring that the pipe ends are aligned and avoiding clamping failure or feeding errors caused by pipe skew. This significantly improves the accuracy and reliability of feeding.

[0080] like Figure 15As shown, the flipping feeding module 5 includes a flipping shaft 51 driven to rotate by a flipping servo motor 521 and multiple flipping clamping components 523 evenly distributed along the axial direction of the flipping shaft 51. The output shaft of the flipping servo motor 521 is connected to one end of the flipping shaft 51 via a coupling. The flipping servo motor 521 is fixedly mounted near the end of the flipping shaft 51 via a motor mounting bracket to ensure the concentricity and stability of power transmission. This arrangement is compact and rigid, effectively reducing transmission errors and vibrations, and improving the accuracy and efficiency of the flipping action. Multiple bearing seats 524 are spaced apart on the flipping shaft 51. The bearing seats 524 are fixedly mounted on the flipping frame base 525 to provide stable support for the flipping shaft 51. A flipping clamping component 523 is installed on the flipping shaft 51 adjacent to each bearing seat 524.

[0081] like Figure 16 As shown, the flipping clamping component 523 includes a rotating arm 5231 mounted on a flipping shaft 51 and a flipping clamping cylinder 5232 installed on the free end side wall of the rotating arm 5231. The rotating arm 5231 is fixed to the flipping shaft 51 by a clamping flange 5233. This fixing method is simple to install and has a firm connection, effectively preventing the rotating arm 5231 from loosening or shifting during high-speed rotation, ensuring the accuracy and consistency of the clamping action. A material guide sheet metal 5234 is connected to the end face of the free end of the rotating arm 5231, which can provide guidance and support during the pipe flipping process, preventing the pipe from shifting or falling due to gravity, and ensuring the smooth completion of the flipping action. This design is particularly suitable for flipping long pipes, significantly improving the stability and safety of the operation. The two jaws of the tilting clamping cylinder 5232 are each connected to a clamping finger 52321. V-shaped grooves 523211 are formed on the opposite sides of each clamping finger 52321. When the jaws are closed, the two V-shaped grooves 523211 combine to form a clamping hole, which can firmly clamp pipes of different diameters while avoiding damage to the pipe surface. This design has high adaptability and reliability, and is suitable for clamping and tilting various specifications of pipes.

[0082] Specific working principle: The flipping clamping cylinder 5232 is activated, causing the two clamping fingers 52321 to close, and the pipe is firmly clamped through the clamping hole formed by the V-groove 523211; the flipping servo motor 521 drives the flipping shaft 51 to rotate through the coupling, causing all flipping clamping parts 523 to rotate synchronously; after flipping to the correct position, the flipping clamping cylinder 5232 is released, and the material guide sheet metal 5234 guides the movement of the pipe, so that the pipe can be smoothly released to the next process; the flipping servo motor 521 rotates in the opposite direction, causing the flipping clamping parts 523 to return to the initial position.

[0083] like Figure 17 and 18As shown, the first bending mechanism 61 includes a moving component, a height adjustment component, a rotary drive component, and a bend component. The moving component provides linear motion in the horizontal direction, driving the entire first bending mechanism 61 to move along the bed slide rail, realizing the feeding and positioning function of the pipe. It includes a flat-push cylinder 611 and a mounting bracket 612 connected to the piston rod of the flat-push cylinder 611. The flat-push cylinder 611 is mounted on a cylinder seat mounting base plate 613. The bottom surface of the cylinder seat mounting base plate 613 is provided with a first slider 614 that moves along the bed slide rail. The mounting bracket 612 serves as the mounting base for the height adjustment component, connecting the moving component with other functional modules. It includes a base plate 6121, a mounting base plate 6122, and a mounting side plate 6123. The bottom surface of the base plate 6121 is provided with a second slider 615 that moves along the bed slide rail. The mounting base plate 6122 is fixed on the base plate 6121.

[0084] like Figure 19 As shown, after the first bend assembly completes its resetting, the height adjustment component lowers the bend below the product, thus meeting the working conditions for the movement of the component. The component includes a first bend lifting cylinder 618, a vertical guide rail 616, and a lifting frame 619. The first bend lifting cylinder 618 is mounted on the mounting base plate 6122, and the vertical guide rail 616 is mounted on the inner wall of the mounting side plate 6123. A third slider 617 is provided on the vertical guide rail 616 and slides along it. The third slider 617 is connected to the lifting frame 619 through a slider mounting plate 6110. The top of the lifting frame 619 is provided with a lifting base plate 6111.

[0085] like Figure 20 As shown, the rotary drive assembly includes a rotary servo motor 6112 and a synchronous belt drive, providing precise rotary power control for the bending angle and speed. The rotary servo motor 6112 is mounted on the bottom surface of the lifting base plate 6111, and the synchronous belt drive includes a driving synchronous pulley 6113, a synchronous belt, and a driven synchronous pulley 6114. The driving synchronous pulley 6113 is mounted on the output shaft of the rotary servo motor 6112. The elbow assembly performs the actual pipe bending operation, forming an adjustable pipe bending channel. It includes a fixed shaft 6115 and a rotating disk 6116. The fixed shaft 6115 passes through and is fixed on the lifting base plate 6111. Its lower end is connected to the fixed shaft cover plate 6117, and its upper end is connected to the fixed wheel 6118. The driven synchronous pulley 6114 is mounted on the fixed shaft 6115 through bearings and is connected to the rotating disk 6116. A spacer 6119 is provided between the driven synchronous pulley 6114 on the fixed shaft 6115 and the lifting base plate 6111. A guide wheel 6120 is connected to the rotating disk 6116 to form the pipe bending channel.

[0086] In addition, a bending platform 6124 is connected to the upper outer side of the mounting side plate 6123. The bending platform 6124 has a clearance hole 61241 for the rotating disk 6116 to extend out, providing a pipe support platform and leaving room for the rotating components to move.

[0087] Working principle: Initial positioning stage: The flat-push cylinder 611 moves along the bed slide rail via the first slider 614 to position the mounting frame 612 to be processed; the first bend lifting cylinder 618 adjusts the height of the lifting frame 619 along the vertical guide rail 616 via the third slider 617, so that the fixed wheel 6118 reaches the bending height of the pipe. Pipe clamping stage: The pipe is fed into the curved pipe channel formed by the fixed roller 6118 and the guide roller 6120; Bending process stage: The rotary servo motor 6112 drives the rotary disk 6116 to rotate through the synchronous belt drive. The driven synchronous belt pulley 6114 drives the rotary disk 6116 to rotate. The fixed wheel 6118 remains fixed, and the guide wheel 6120 moves with the rotary disk 6116, forcing the pipe to bend around the fixed wheel 6118.

[0088] Reset phase: After bending is completed, the rotating disk 6116 returns to the initial position, the first bending lifting cylinder 618 descends, and the flat pushing cylinder 611 resets, preparing for the next processing cycle.

[0089] like Figures 21-25As shown, the pipe bending mechanism 62 includes a traveling assembly 621, a housing frame 622, a pipe bending assembly 623, a pipe bending radius changing assembly 624, and a lifting assembly 625. The traveling assembly 621 includes a traveling base plate 6211 and a traveling drive motor 6212 mounted on the upper surface of the traveling base plate 6211. The housing frame 622 is fixed on the traveling base plate 6211. The pipe bending assembly 623 includes a pipe bending drive motor 6231, a transmission gear set 6232, a sleeve shaft 6233, and a pipe bending assembly. Component 6234, the pipe bending drive motor 6231 is mounted on the front side of the housing frame 622, its output shaft is connected to the driving bevel gear 62321 of the transmission gear set 6232, the sleeve shaft 6233 is mounted on the top plate of the housing frame 622, its upper end is connected to the pipe bending component 6234, and its middle section is equipped with the driven bevel gear 62322 of the transmission gear set 6232; the pipe bending radius conversion assembly 624 includes a pipe bending radius drive motor 6241, a synchronous belt transmission component 6242, and an inner shaft. The components 6243 and 6244 are included. A bending radius drive motor 6241 is located below the walking base plate 6211, and its output shaft is connected to the drive pulley 62421 of the synchronous belt drive component 6242. The upper part of the inner shaft component 6243 extends into the sleeve shaft component 6233, with its upper end connected to the changing component 6244 and its lower end connected to the driven pulley 62422 of the synchronous belt drive component 6242. The lifting assembly 625 includes a first set of lifting cylinders 6251 and a second set of lifting cylinders 625... 2. A first lifting limit plate 6253 and a second lifting limit plate 6254 are respectively disposed at the lower part of the sleeve shaft 6233 and the lower part of the inner shaft 6243. A first set of lifting cylinders 6251 are installed on the inner side wall of the housing frame 622, and their piston rods are connected to the first lifting limit plate 6253. A second set of lifting cylinders 6252 are installed on the bottom plate of the housing, and their piston rods are connected to the second lifting limit plate 6254.

[0090] In other words, the pipe bending mechanism 2 in this embodiment includes three servo reduction motors. The pipe bending radius drive motor 6241 drives the inner shaft 6243 to rotate through the synchronous belt transmission component 6242, thereby causing the changing component 6244 to rotate and change the pipe bending radius. The pipe bending drive motor 6231 drives the pipe bending component 6234 to bend the pipe through the transmission gear set 6232. The travel drive motor 6212 drives the entire pipe bending mechanism 62 to move, thereby achieving pipe bending according to the set size.

[0091] The various mechanisms of the pipe bending mechanism 62 in this embodiment will now be described in detail, as follows: like Figure 22 and Figure 23As shown, in the traveling assembly 621, a slider is connected to the bottom surface of the traveling base plate 6211. A power helical gear 6214 is mounted on the output shaft of the traveling drive motor 6212. The power helical gear 6214 meshes with a helical rack on the bed 1. The traveling drive motor 6212 drives the power helical gear 6214 to rotate, meshing with the helical rack mounted on the bed 1, causing the tube bending mechanism 62 to move along the guide rail on the bed 1. The housing frame 622 includes a housing base plate, housing side plates, and a housing top plate. The housing base plate is fixed to the traveling base plate 6211. A deep groove ball bearing 6221 is installed inside the housing top plate and is fixed by a hole clamp.

[0092] like Figure 24 and Figure 25 As shown, in the pipe bending assembly 623, a pipe bending reduction motor mounting plate is fixed on the side plate of the housing, and the pipe bending drive motor 6231 is fixed on the pipe bending reduction motor mounting plate. The transmission gear set 6232 includes a driving bevel gear 62321 and a driven bevel gear 62322. The driving bevel gear 62321 is mounted on the output shaft of the pipe bending drive motor 6231. The sleeve shaft 6233 includes a bevel gear connecting sleeve shaft 62331 and an outer sleeve shaft 62332. The bevel gear connecting sleeve shaft 62331 passes through the inner hole of the deep groove ball bearing 6221. The driven bevel gear 62322 is fixed on the end face of the bevel gear connecting sleeve shaft 62331 and presses against the inner ring of the deep groove ball bearing 6221, so that the bevel gear connecting sleeve shaft 62331 rotates together with the driven bevel gear 62322. The bevel gear connecting sleeve shaft 62331 and the outer sleeve shaft 62332 have four corresponding pin holes, and the two are connected by pins. The inner bore of the outer sleeve shaft 62332 is fitted with two types of needle roller bearings 62333, which are fixed to the outer sleeve shaft 62332 by a retaining spring. The pipe bending component 6234 includes a sleeve mold mounting ring 62341 and an internally threaded cylindrical pin 62342. The sleeve mold mounting ring 62341 is connected to the upper end face of the outer sleeve shaft 62332 to form a receiving cavity. The internally threaded cylindrical pin 62342 is connected to the sleeve mold mounting ring 62341. The meshing of the driving bevel gear 62321 and the driven bevel gear 62322 realizes pipe bending reversal and pipe bending.

[0093] like Figure 26 and Figure 27As shown, in the pipe bending radius conversion assembly 624, the synchronous belt drive component 6242 includes a pulley mounting bracket 62423, a driving pulley 62421, a synchronous belt 62424, a driven pulley 62422, and a driven pulley fixing shaft 62425. The pulley mounting bracket 62423 consists of a mounting bracket vertical plate, a mounting bracket stiffener, and a mounting bracket horizontal plate. The driven pulley fixing shaft 62425 passes through the inner hole of the bearing built into the mounting bracket horizontal plate and is fixed to the mounting bracket horizontal plate by a snap ring. The driven pulley 62422 is mounted on the driven pulley fixing shaft 62425. The pipe bending radius drive motor 6241 is mounted below the walking base plate 6211 through a motor mounting seat. The inner shaft component 6243 includes a first inner shaft 62431 and a second inner shaft 62432. A flat region is milled on the first inner shaft 62431. The lower part of the first inner shaft 62431 extends into a through hole in the second inner shaft 62432. The two are connected together by a connector on the flat region of the first inner shaft 62431. Figure 24 and Figure 25 The first inner shaft 62431 passes through the inner hole of the needle roller bearing 62333 inside the outer shaft 62332 to satisfy the lifting and rotation functions of the first inner shaft 62431. The upper end of the first inner shaft 62431 has a cross-shaped groove 624311. The second inner shaft 62432 is also milled with a flat area, which is connected to the lifting stop 62433 and the inner shaft stop 62434 through connecting parts. The lifting stop 62433 is equipped with two cylindrical pins. A flat key is installed at the lower part of the second inner shaft 62432. The lower part of the second inner shaft 62432 and the flat key pass together into the inner hole of the driven pulley 62422. The driven pulley 62422 is connected to the driven pulley fixed shaft 62425. In this way, the position of the driven pulley 62422 remains unchanged when the second inner shaft 62432 is lifted or lowered. The changing part 6244 includes a mold mounting plate 62441 and a bending mold 62442. The bottom of the mold mounting plate 62441 is milled with a cross-shaped convex groove 624411, which is engaged with a cross-shaped concave groove 624311. The bending radius drive motor 6241 rotates, which drives the mold mounting plate 62441 to rotate, so as to realize the bending radius changing.

[0094] like Figure 28 and Figure 29As shown, in the lifting assembly 625, the first set of lifting cylinders 6251 is connected to the first lifting limit plate 6253 through cylinder spacers. The first lifting limit plate 6253 is provided with a first bearing 62531. A first lifting cover plate 6255 is provided above the first lifting limit plate 6253 to press the first bearing 62531. The outer sleeve shaft 62332 passes through the inner hole of the first bearing 62531 and is pressed by the tightening nut 6256 to the inner ring of the first bearing 62531, thereby fixing the outer sleeve shaft 62332 on the first lifting limit plate 6253. The second set of lifting cylinders 6252 is connected to the second lifting limit plate 6254 through cylinder spacers. The second lifting limit plate 6254 is provided with a second bearing 6257. A second lifting cover plate 6258 is provided above the second lifting limit plate 6254 to press the second bearing 6257. The second inner shaft 62432 passes through the inner hole of the second bearing 6257 and is fixed on the second bearing 6257 by a shaft clip, so that the second inner shaft 62432 moves together with the second set of lifting cylinders 6252.

[0095] When the bending radius needs to be changed, the first set of lifting cylinders 6251 remains extended, the second set of lifting cylinders 6252 is retracted, and the bending radius drive motor 6241 rotates to change the bending radius. When the bending direction needs to be changed, the second set of lifting cylinders 6252 remains extended, the first set of lifting cylinders 6251 retracts, and the bending drive motor 6231 rotates to change the bending direction.

[0096] The pipe bending mechanism 62 achieves multi-functional pipe processing through the coordinated operation of three servo geared motors. The travel drive motor 6212 drives the power helical gear 6214 to mesh with the helical rack of the bed 1, driving the entire device to be precisely positioned along the guide rail. When the preset processing position is reached, the pipe bending radius drive motor 6241 drives the inner shaft 6243 to rotate through the synchronous belt transmission component 6242. The cross-shaped groove 624311 at the upper end of the first inner shaft 62431 drives the mold mounting plate 62441 to rotate, realizing automatic switching of molds with different radii. During the radius switching process, the first set of lifting cylinders 6251 remains in the extended state to fix the sleeve shaft 6233, and the second set of lifting cylinders 6252 retracts to allow the inner shaft 6243 to rotate freely. After the radius setting is completed, the pipe bending drive motor 6231 drives the sleeve shaft 6233 to rotate through the bevel gear set, and the sleeve shaft mold mounting ring 62341 drives the mold to bend the pipe. The bidirectional pipe bending function is achieved through the forward and reverse rotation of the bevel gear set. When it is necessary to change the bending direction, the second set of lifting cylinders 6252 extends to fix the inner shaft 6243, while the first set of lifting cylinders 6251 retracts to release the release sleeve 6233, causing the pipe bending drive motor 6231 to rotate in the opposite direction. Throughout the entire processing, the needle roller bearing 62333 and the deep groove ball bearing 6221 ensure the smooth operation of each rotating component, while the lifting stop 62433 and the inner shaft stop 62434 precisely control the stroke position of each component.

[0097] like Figure 30 As shown, a rotary pressing cylinder 626 is provided near the receiving sheet metal of the pipe bending mechanism 62. Before the pipe bending mechanism 62 moves, the rotary pressing cylinder 626 rotates to move the pressing block 6261 to the position near the receiving sheet metal, so as to ensure that the position of the pipe bending mechanism 62 remains unchanged during the movement.

[0098] like Figure 30 As shown, the intermediate head mechanism 63 includes a frame 630, a walking component with the same structure as the walking component 621, an intermediate clamping cylinder 631, a rack pushing cylinder 632, a notched gear 633, and a limiting block 634. The intermediate clamping cylinder 631 is fixed to one side of the limiting block 634 for clamping the pipe fitting. A gear mounting component is installed on the limiting block 634, and one end of the gear mounting component is connected to the notched gear 633. Notches are provided on the notched gear 633, the limiting block 634, and the gear mounting component for placing and limiting the pipe fitting. The notched gear 633 meshes with a vertically arranged rack, which is mounted on the piston rod of the rack pushing cylinder 632. To ensure the stability of the rack movement, a rack guide frame is provided, through which the rack passes. Since the intermediate clamping cylinder 631 and the limiting block 634 restrict the movement of the pipe at this point, the rack pushes the cylinder 632 to move up and down, which drives the notched gear 633 to rotate in both directions, so as to realize the rotation of the pipe at this point. The rotation angle is 90° or 180°.

[0099] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An automatic double-head folding machine, characterized in that, The system includes a bed (1) and, from the inside out, a straightening and unloading module (2), a flaring module (3), a toothed feeding module (4), a flipping feeding module (5), and a folding and bending module (6) arranged sequentially on the bed (1). The straightening and unloading module (2) includes a straightening mechanism, a traction feeding mechanism, and a cutting mechanism. The flaring module (3) includes a fixed flaring mechanism (31) installed at one end of the bed (1) and a movable flaring mechanism (32) that moves back and forth along the bed (1) to adjust the flaring position according to the product length. The toothed feeding module (4) includes multiple... The toothed assembly mechanism (41) includes a flipping feeding module (5) including a flipping shaft (51) and multiple flipping clamping mechanisms (52) located on the flipping shaft (51) and rotating with it; the folding and bending module (6) includes a first bending mechanism (61), a bending mechanism (62) and an intermediate head mechanism (63). The straight pipe fed by the flipping feeding module (5) is first bent by the first bending mechanism (61), then bent at multiple angles by the bending mechanism (62), and then clamped and rotated by the intermediate head mechanism (63) to form a three-dimensional structure pipeline.

2. The automatic double-head folding machine according to claim 1, characterized in that: The first bending mechanism (61) includes a moving component, a rotary drive component, a bending head component, and a height adjustment component. The moving component includes a horizontal thrust cylinder (611) and a mounting bracket (612) connected to the piston rod of the horizontal thrust cylinder (611) and movable back and forth along the bed (1). The rotary drive component and the height adjustment component are both mounted on the mounting bracket (612). The rotary drive component includes a rotary servo motor (6112) and a synchronous belt drive component. The bending head component includes a fixed shaft (6115) and a rotating part driven by the synchronous belt drive component. A rotating disc (6116) is provided, and a fixed shaft (6115) passes through the rotating disc (6116) and is connected to a fixed wheel (6118). A guide wheel (6120) is connected to the rotating disc (6116) to form a curved pipe channel. The height adjustment assembly includes a first-bend lifting cylinder (618) and a lifting frame (619). The first-bend lifting cylinder (618) is installed on the bottom surface of the mounting frame (612), and its piston rod is connected to the lifting frame (619). The top of the lifting frame (619) is provided with a mounting hole for mounting the fixed shaft (6115).

3. The automatic double-head folding machine according to claim 1, characterized in that: The pipe bending mechanism (62) includes a traveling assembly (621), a pipe bending assembly (623), a pipe bending radius changing assembly (624), and a lifting assembly (625). The traveling assembly (621) includes a traveling base plate (6211) and a traveling drive motor (6212) mounted on the traveling base plate (6211). The pipe bending assembly (623) is mounted on the traveling base plate (6211) via a housing frame (622), and includes a pipe bending drive motor (6231), a transmission gear set (6232), and a sleeve shaft (623). 3) and the pipe bending component (6234), the pipe bending component (6234) is set on the upper end of the sleeve shaft component (6233), the sleeve shaft component (6233) is provided with the driven bevel gear (62322) of the transmission gear set (6232), the driven bevel gear (62322) meshes with the driving bevel gear (62321) at the output end of the pipe bending drive motor (6231); the pipe bending radius changing component (624) includes the pipe bending radius drive motor (6241), the synchronous belt transmission component (6242), the inner shaft component (6243) and the changing component (624). 4) The upper part of the inner shaft (6243) extends into the sleeve shaft (6233), and its upper end is connected to the changing part (6244), and its lower end is connected to the driven pulley (62422) of the synchronous belt drive (6242). The bending radius drive motor (6241) is located below the walking base plate (6211), and its output shaft is connected to the driving pulley (62421) of the synchronous belt drive (6242). The lifting assembly (625) includes a first set of lifting cylinders (6251), a second set of lifting cylinders (6252), and a first lifting limit plate ( The first lifting limit plate (6253) and the second lifting limit plate (6254) are respectively set at the lower part of the sleeve shaft (6233) and the lower part of the inner shaft (6243). The first set of lifting cylinders (6251) is installed on the inner side wall of the box frame (622), and its piston rod is connected to the first lifting limit plate (6253). The second set of lifting cylinders (6252) is installed on the bottom plate of the box frame (622), and its piston rod is connected to the second lifting limit plate (6254).

4. The automatic double-head folding machine according to claim 3, characterized in that: A power helical gear (6214) is mounted on the output shaft of the walking drive motor (6212), and the power helical gear (6214) meshes with the helical rack on the bed (1); a deep groove ball bearing (6221) is provided in the top plate of the housing frame (622), and the sleeve shaft (6233) includes a bevel gear connecting sleeve shaft (62331) and an outer sleeve shaft (62332). The bevel gear connecting sleeve shaft (62331) passes through the inner hole of the deep groove ball bearing (6221) and passes through the driven bevel gear (62322). The outer sleeve shaft (62332) and the bevel gear connecting sleeve shaft (62331) are connected by a pin. The first lifting limit plate (6253) is provided with a first bearing (62531), and a first lifting cover plate (6255) is provided above the first lifting limit plate (6253) to press the first bearing (62531). The outer sleeve shaft (62332) passes through the inner hole of the first bearing (62531) and presses the inner ring of the first bearing (62531) by tightening the nut (6256).

5. The automatic double-head folding machine according to claim 4, characterized in that: The inner shaft component (6243) includes a first inner shaft (62431) and a second inner shaft (62432). The lower part of the first inner shaft (62431) extends into the through hole of the second inner shaft (62432). The upper end of the first inner shaft (62431) has a cross-shaped groove (624311). The lower end of the second inner shaft (62432) is connected to the driven pulley (62422) via a flat key. The driven pulley (62422) is mounted on the pulley mounting bracket (62423) via a driven pulley fixing shaft (62425). The forming component (6244) includes a mold mounting plate (62441) and a pipe bending mold (62442). The bottom of the mold mounting plate (62441) has a cross-shaped groove (624311) at the bottom. The part is milled with a cross-shaped convex groove (624411), which is engaged with the cross-shaped concave groove (624311); the second lifting limit plate (6254) is provided with a second bearing (6257), and a second lifting cover plate (6258) is provided above the second lifting limit plate (6254) to press the second bearing (6257); the second inner shaft (62432) passes through the inner hole of the second bearing (6257) and is fixed on the second bearing (6257) by a shaft clamp; a lifting stop block (62433) and an inner shaft stop block (62434) are respectively connected on the second inner shaft (62432), and a cylindrical pin is installed on the lifting stop block (62433).

6. The automatic double-head folding machine according to claim 5, characterized in that: The inner hole of the outer shaft (62332) is provided with a needle roller bearing (62333), and the first inner shaft (62431) passes through the inner hole of the needle roller bearing (62333); the bent pipe component (6234) includes a sleeve shaft mold mounting ring (62341) and an internally threaded cylindrical pin (62342). The sleeve shaft mold mounting ring (62341) is connected to the upper end face of the outer shaft (62332) to form a receiving cavity for accommodating the mold mounting plate (62441), and the internally threaded cylindrical pin (62342) is connected to the sleeve shaft mold mounting ring (62341).

7. The automatic double-head folding machine according to claim 1, characterized in that: The movable flaring mechanism (32) includes a base plate (321), a drive reduction motor (322), a cylindrical gear (323), a flaring advance / retract cylinder (324), a clamping cylinder (3211), a flaring cylinder (3214), and a flaring guide cylinder (3220). The drive reduction motor (322) is mounted on the base plate (321), and its output shaft passes through the base plate (321) and is connected to the cylindrical gear (323). The cylindrical gear (323) meshes with the rack on the bed (1). A linear guide rail (326) is mounted on the base plate (321), and a slider (327) that moves along the linear guide rail (326) is provided on the linear guide rail (326). A housing (325) is connected to the slider (327), and the piston rod of the flaring advance / retract cylinder (324) is connected to the housing. (325) Connection; The top of the box (325) is connected to a fixed clamping block (329), and a slot is provided on the fixed clamping block (329). The clamping cylinder (3211) is vertically installed on the top of the fixed clamping block (329), and its piston rod is connected to the movable clamping block (3210) that extends into the slot; The flaring cylinder (3214) is installed on the flaring cylinder plate (3217), and four guide posts (3218) are passed through the flaring cylinder plate (3217) and the fixed clamping block (329). A movable plate (3215) is slidably arranged on the guide post (3218), and a flaring needle (3216) is installed on the movable plate (3215); The flaring guide cylinder (3220) is installed on the side wall of the fixed clamping block (329), and its output end is connected to the flaring guide flare (3221).

8. The automatic double-head folding machine according to claim 7, characterized in that: The piston rod of the flared cylinder (324) is connected to the movable cylinder flange (328), which is connected to the housing (325). A lower clamping insert (3212) is fixed on the bottom surface of the slot of the fixed clamping block (329), and an upper clamping insert (3213) is connected to the bottom surface of the movable clamping block (3210). A semi-circular arc groove is opened on the bottom surface of the upper clamping insert (3213) and the top of the lower clamping insert (3212). The movable clamping block (3210) faces the flared cylinder (325). 14) is connected to a stop block (3223) on one side. The stop block (3223) is in the shape of a "7" and is composed of a horizontal part (32231) and a vertical part (32232). The vertical part (32232) has a central clearance hole (322321) for the flaring needle (3216) to extend into. The piston rod of the flaring cylinder (3214) passes through the flaring cylinder plate (3217) and is connected to the flaring cylinder flange (3219). The flaring cylinder flange (3219) is connected to the movable plate (3215).

9. The automatic double-head folding machine according to claim 1, characterized in that: The toothed rack mechanism (41) includes a fixed part (411), a movable part (413), and a feeding cylinder (412). The fixed parts (411) of the multiple toothed rack mechanisms (41) are connected by a tie rod (414). The top of the fixed part (411) and the movable part (413) are inclined surfaces and are provided with serrated grooves (410). The serrated grooves (410) of the two are staggered on the vertical projection plane. A bearing is installed on one side wall of the fixed part (411). A strip hole (4131) for the bearing to extend into is provided on the movable part (413). The movable part (413) is connected to the piston rod of the feeding cylinder (412) through a connecting plate (418). The feeding cylinder (412) is installed on the bed (1). A aligning cylinder (43) is provided at one end of the toothed rack feeding module (4) near the flip feeding module (5).

10. The automatic double-head folding machine according to claim 1, characterized in that: The flipping clamping mechanism (52) includes a flipping frame base, a flipping bearing seat, a rotating arm (5231) and a flipping clamping cylinder (5232). The flipping frame base is fixed on the bed (1). The flipping bearing seat is installed on the flipping frame base. One end of the rotating arm (5231) is sleeved on the flipping shaft (51) and is located close to the flipping bearing seat. The other end of the flipping arm (51) is equipped with a flipping clamping cylinder (5232). The output end of the flipping clamping cylinder (5232) is connected to a clamping finger (52321) with a V-groove (523211).

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