Automatic forming integrated machine for short U-shaped ring without scraps

Abstract

This invention provides an automatic integrated forming machine for chipless short U-shaped collars. The cutting unit clamps the short pipe to be cut, which is then clamped by a splitting and feeding unit. During the downward movement of the splitting and feeding unit, any incompletely cut short pipe is split. The discharge side of the splitting and feeding unit corresponds vertically to the initial feeding side of the pushing and positioning unit. As the short pipe falls into the pushing and positioning unit and is pushed towards the bending unit, the feeding pins in the pushing and positioning unit and the positioning pins in the bending unit extend to the straight sections to be formed at both ends of the short pipe for anti-displacement positioning during bending. This invention solves the quality defects of traditional equipment, such as the impact of pipe feeding jumps and displacement on the cutting accuracy of short pipes and the inconsistent lengths of the two straight sections of the formed short U-shaped collar. The splitting and feeding unit clamps the short pipe and moves downward, greatly reducing wear on the clamping parts, improving feeding stability and short pipe cutting accuracy, ensuring forming quality, and ensuring smooth connection between each process.

Description

Technical Field

[0001] This invention belongs to the field of machining technology, specifically relating to an automatic integrated machine for forming chipless short U-shaped collars. Background Technology

[0002] Existing short U-tube processing requires sequential steps through a cutting machine, flaring machine, bending machine, cleaning machine, and ring-forming machine, involving cutting, flaring, bending, cleaning, degreasing, and ring forming. This process is cumbersome, inconvenient to operate, and labor-intensive. To address these issues, our company designed a cutting head and its superimposed short U-bend ring-forming automatic forming machine (application number CN201510458729.8, patent name: Cutting Head and its Superimposed Short U-Bend Ring Forming Machine). This machine features a cutting unit, flaring unit, and bending unit supported at the top of the machine, while the ring-forming unit at the bottom operates automatically and collaboratively. This significantly simplifies the traditional, multi-step process, offering advantages such as simple structure, convenient operation, reduced manpower and material costs, and the ability to work continuously for extended periods. However, [the text abruptly ends here]. The following problems were found during production: 1) When the pipe on the feed side of the equipment is clamped by the feeding cylinder and moved to the left limit and then released to reset, due to the relatively long length of the pipe, the loose pipe is prone to jumping and backward displacement, resulting in poor feeding stability and poor length accuracy of the short pipes that need to be cut to a fixed length, which seriously affects the feeding accuracy; 2) The molds used to clamp the pipes in the cutting unit and the flaring unit are prone to wear on the pipe clamping parts, affecting the effective connection between the fixed length cutting and flaring processes, and affecting production efficiency; 3) The short U-shaped collar formed after the cut short pipes are bent by the bending unit has two straight segments of different lengths due to the displacement of the straight segments of the short pipes. Therefore, it is necessary to improve the above problems. Summary of the Invention

[0003] The technical problem solved by this invention is to provide an integrated automatic forming machine for chipless short U-shaped collars. It employs an optimized tensioning feeder unit, a segmenting feeder unit, and a pushing and positioning unit mounted on a base plate. This solves the quality defects of traditional equipment, such as the impact of pipe feeding jumps and shifts on short pipe cutting accuracy and the inconsistent lengths of the two straight segments of the formed short U-shaped collar. The segmenting feeder unit's clamping and downward feeding method for the short pipe greatly reduces wear on the clamping parts. The machine integrates multiple processes, simplifies the workflow, reduces costs, improves feeding stability and short pipe cutting accuracy, ensures forming quality, guarantees smooth connection between processes, and improves production efficiency.

[0004] The technical solution adopted in this invention is: a chipless short U-shaped collar automatic forming integrated machine, including a frame and a base plate located at the upper left end of the frame. The upper right end of the frame is equipped with a collar forming unit for fitting welding rings onto the formed short U-shaped collars. From right to left, the base plate is equipped with a tension feeding unit, a cutting unit, a slitting feeding unit, a pushing and positioning unit, and a bending unit. Both the frame and the base plate have guide frames at their right ends for guiding the tube material into the machine. The right end of the base plate has a straightening and rounding device located to the right of the tension feeding unit for straightening the tube material. The tube is tensioned and fed into the cutting unit by a tensioning feeder unit for cutting. The cutting unit clamps the cut short tube, which is then clamped by a splitting feeder unit. During the downward movement of the splitting feeder unit, the incompletely cut short tube is split. The discharge side of the splitting feeder unit corresponds vertically to the feed side of the pusher positioning unit, which is in its initial position. As the short tube falls into the pusher positioning unit and is pushed towards the bending unit, the feeding pin in the pusher positioning unit and the positioning pin in the bending unit extend to the straight sections to be formed at both ends of the short tube to prevent displacement during bending.

[0005] The tensioning feeder unit includes a feed drive assembly, a clamping mold assembly one, and a clamping mold assembly two, which are rotatably supported on the feed side plate at the right end of the base plate. The moving part of the feed drive assembly is fixedly connected to a moving plate that is guided and installed along the length direction of the base plate. The clamping mold assembly one, which is used to clamp the pipe, is installed on the moving plate. The feed drive assembly drives the moving plate and the clamping mold assembly one to reciprocate along the length direction of the base plate. A fixed frame is provided on the right side of the feed drive assembly on the right end plate of the base plate. The clamping mold assembly two, which is used to clamp the pipe, is installed on the fixed frame. Stable feeding of the pipe is achieved by the alternating clamping cooperation of the clamping mold assembly two and the clamping mold assembly one with a pair of pipes.

[0006] Furthermore, the feed drive assembly includes a motor and a lead screw arranged parallel to the length direction of the base plate. The two ends of the lead screw are rotatably supported on the upright plate of the base plate through bearing seats, and the nut seat adapted to the lead screw is fixedly connected to the moving plate. Under the drive of the motor, the nut seat drives the moving plate and the clamping mold assembly to reciprocate along the length direction of the base plate. The clamping mold assembly 2 and clamping mold assembly 1 have the same structure. Both are driven by a cylinder to move the movable clamping mold and clamp the pipe between the movable clamping mold and the fixed clamping mold.

[0007] Furthermore, the segmented feeding unit includes a lifting plate arranged parallel to the width direction of the base plate and located on the discharge side of the cutting unit. A first clamp group and a second clamp group arranged below the lifting plate are respectively installed at the bottom of the lifting plate through guide components. Two small cylinders are symmetrically fixed on the upper surface of the lifting plate, and the extension ends of the two small cylinders are respectively fixedly connected to the first clamp group and the second clamp group through connecting plates that pass through guide holes at corresponding positions on the surface of the lifting plate. When the two small cylinders drive the first clamp group and the second clamp group to move in opposite directions, they clamp or release the short pipe. The two ends of the lifting plate are supported on the base plate by lifting devices. The short pipe cut by the cutting component is clamped and moved downward by the first clamp group and the second clamp group driven by the lifting device, realizing the short pipe displacement, segmentation and downward feeding. The outer sides of both ends of the first clamp group and the second clamp group are provided with limit adjustment devices installed on the bottom surface of the lifting plate for adjusting and limiting the outward movement of the first clamp group and the second clamp group.

[0008] Furthermore, the lifting device includes a large atmospheric cylinder, the lower end of which is fixed to the base plate via a cylinder seat, and the telescopic part of the upper end of the atmospheric cylinder is fixedly connected to the corresponding end of the lifting plate. Under the telescopic control of the atmospheric cylinder, the lifting plate can be raised and reset or lowered to cut off feeding. A guide rod located outside the atmospheric cylinder and passing through the guide hole on the corresponding end plate surface of the lifting plate is also fixed on the cylinder seat. Both the first and second chuck groups include a mounting plate and clamping plates. The mounting plate is fixed to the bottom of the guide rail in the guide assembly, and the upper ends of multiple clamping plates are fixed to the bottom of the mounting plate. The lower ends of the clamping plates in the first and second chuck groups have corresponding arc-shaped grooves on their facing sides. The lower ends of the two connecting plates are fixedly connected to the mounting plates in the first and second chuck groups, respectively. When the first and second chuck groups move towards or away from each other under the drive of two small cylinders, the two clamping plates clamp or release the short pipe located in the arc-shaped groove.

[0009] Furthermore, the material pushing and positioning unit includes a pusher plate guided and mounted on the base plate and a receiving plate located on the left side of the pusher plate. The pusher plate and the receiving plate are connected as a whole through a bottom pusher drive device with adjustable spacing. An adjustment device is installed on the base plate, and the moving part of the adjustment device is fixedly connected to the pusher plate or the receiving plate. Under the drive of the adjustment device, the pusher plate and the receiving plate move to the left synchronously to the feeding position of the bending unit. The upper surface of the receiving plate is provided with multiple receiving grooves along its length for receiving short pipes that are clamped and lowered and cut by the first chuck group and the second chuck group in the cutting and feeding unit. The pusher plate is equipped with the same number of receiving grooves and their positions correspond to those of the receiving grooves. The feeding needle, driven by the pushing drive device, moves the feeding needle to the left towards the receiving plate, so that the left end of the feeding needle is adapted and positioned in the straight section to be formed on the right end of the short tube and pushes it into the forming groove in the bending unit. During the bending process, the short tube is anti-slip and positioned by the feeding needle extending into the straight section on the right end and the positioning needle in the bending unit extending into the straight section on the left end. The pushing plate is provided with multiple unloading drive devices. The right end of the unloading needle, which is the same number as the receiving groove and is correspondingly positioned, is fixedly connected to the unloading drive device at the corresponding position. Under the drive of the unloading drive device, the left-moving unloading needle pushes the bent short U-shaped collar out of the forming groove.

[0010] Furthermore, the pusher drive device includes two symmetrically arranged sensorless cylinders. The left end of the sensorless cylinder is fixedly connected to the bottom of the receiving plate, and the slider of the sensorless cylinder is fixedly connected to the pusher plate. Under the control of the sensorless cylinder, the pusher plate moves toward or away from the receiving plate. The adjustment device includes a sensorless cylinder two fixed on the base plate. The sensorless cylinder two is arranged perpendicular to the length direction of the push plate and the receiving plate. The transition plate, which is fixedly connected to the slider of the sensorless cylinder two, is fixedly connected to the receiving plate or the push plate. Under the control of the sensorless cylinder two, the push plate and the receiving plate move to the left or right synchronously. The unloading drive device includes multiple ultra-thin cylinders and an unloading push plate. Multiple mounting slots are formed on the surface of the push plate, and the ultra-thin cylinders are located in the mounting slots and fixedly connected to the push plate. The unloading push plate has a T-shaped plate structure, and the lower end of the unloading push plate, which is adapted to the mounting slot guide, is fixedly connected to the piston rod of the ultra-thin cylinder. Two unloading needles are fixed on the upper left side wall of the unloading push plate. When the bent short U-shaped collar is unloaded, the left end of the unloading needle is driven by the ultra-thin cylinder to push the inner ring surface of the short U-shaped collar to the left and push it out of the forming slot.

[0011] Furthermore, the bending unit includes a compensating power drive device and a bending mechanism. The compensating power drive device includes a main power drive unit and a power compensation unit disposed on both sides of the upper surface of the base plate. The bending mechanism includes a bending clamping die assembly and a bending assembly. Between the main power drive unit and the power compensation unit is the bending clamping die assembly mounted on the base plate and the bending assembly located outside the bending clamping die assembly with both ends rotatably supported on the base plate. The output shaft of the main power drive unit is fixedly connected to one end of the bending shaft in the bending assembly, and the other end of the bending shaft is connected to the power compensation unit. Under the synchronous action of the main power drive unit and the power compensation unit, the bending assembly is driven to rotate.

[0012] Furthermore, the active power drive unit includes a servo motor and a reducer. The reducer is supported on a base plate and fixed to the reducer housing. The output shaft of the servo motor is fixedly connected to the input shaft of the reducer. The output shaft of the reducer is fixedly connected to one end of a bending shaft. The power compensation unit includes a cylinder, a rack, and a gear. The cylinder is located outside the other end of the bending shaft and fixed to the base plate. The end of the cylinder piston rod is fixedly connected to the corresponding end of the rack, which is guided and mounted on the base plate and is spatially perpendicular to the bending shaft. The gear fixed at the other end of the bending shaft meshes with the rack, and the rack and gear work together to assist the bending shaft in its rotational motion under the extension and retraction of the cylinder piston rod.

[0013] Furthermore, the base plate is inclined and supported on the upper left end of the frame, with the left side lower than the right side, and the guide frame fixed to the right end of the base plate is parallel to the base plate; the guide frame includes a bracket and a long shaft rotatably mounted on the bracket, and support plates are installed on the upper side walls of the bracket through oblong holes and bolts with adjustable height, and the two ends of the long shaft are installed on the upper end of the support plates, and multiple guide wheels for supporting and guiding the pipe material are rotatably mounted on the long shaft; The base plate and the frame are equipped with guardrails on both long sides, and the left end of the base plate is equipped with a double-door guardrail.

[0014] Advantages of this invention compared to existing technologies: 1. This technical solution uses a first and second chuck assembly, driven by two small cylinders, to move in opposite directions below the lifting plate. This allows for stable clamping of the short pipe before and after cutting. The lifting device then moves the lifting plate, the first chuck assembly, and the second chuck assembly up and down, using the shearing force during downward movement to reliably separate and feed the incompletely cut portion of the short pipe. This avoids the problem of insufficient clamping force during horizontal movement caused by mold wear in the original structure, which leads to pipe slippage and breakage. This ensures orderly connection of each process, guarantees production progress, and eliminates gaps between processes by simultaneously cutting and feeding the short pipe downwards, thus improving production continuity. 2. This technical solution uses a movable clamping mold assembly 1 driven by a feed drive component and a clamping mold assembly 2 fixed on a fixed frame. The two components alternately clamp the pipe during feeding, preventing the pipe from becoming loose during the feeding cycle. This fundamentally solves the problems of pipe jumping and backward displacement, ensuring accurate positioning of the pipe during feeding and avoiding the problem of poor short pipe length cutting accuracy caused by feeding deviation. This provides a basic guarantee for the quality of subsequent chipless short U-shaped ring forming. The structure is simple, the optimized structure is reasonable, the structural connection relationship is clear, no complex additional structure is required, and it is easy to install and maintain. 3. This technical solution optimizes the structure of the power drive part in the bending mechanism. It adopts a main power drive unit and a power compensation unit located at both ends of the bending shaft to synchronously drive the bending shaft to rotate. The synchronous power at both ends eliminates the deflection of the bending shaft, and the direct transmission reduces errors. It ensures the consistency of force and deformation of the same batch of workpieces during the bending process, improves the forming quality of the short U-shaped collar, solves the problem of uneven driving force at both ends of the bending shaft causing deflection in the traditional drive structure, ensures the rotation stability of the bending mechanism, reduces the wear of components caused by the deflection of the bending shaft, extends the service life of the core components of the equipment, reduces maintenance costs, and meets the requirements of high-precision processing. 4. This technical solution utilizes the coordination between the feeding pin and the positioning pin in the bending process. The left end of the feeding pin is fitted and positioned within the straight segment to be formed on the right end of the short tube, while the positioning pin extends into the straight segment to be formed on the left end of the short tube. This dual positioning structure effectively prevents the short tube from slipping during the bending process, avoiding the problem of length difference in the straight segment of the formed short U-shaped collar due to displacement. This ensures that the two straight segments of the short U-shaped collar are of consistent size, improving the product qualification rate. The pushing drive device can drive the pushing plate to automatically push the feeding pin to the forming section of the bending process. The forming groove and unloading drive device can drive the unloading needle to automatically push the bent short U-shaped collar out of the forming groove, reducing manual intervention and realizing the automated connection of short tube pushing, bending positioning and finished product unloading, reducing labor intensity and improving processing efficiency; the push plate and receiving plate can be adjusted in distance through the bottom push drive device, and the adjustment device can drive both to move to the left synchronously to the feeding position of the bending process. The distance and overall position of the push plate and receiving plate can be adjusted according to the different specifications of the short tube, adapting to the processing needs of short U-shaped collars of different sizes, with a wide range of applications; 5. This technical solution achieves rolling support during material feeding by setting a guide frame on the base plate and the right end of the frame, thereby constraining the running direction of the tensioned material tube and improving the stability and safety of material feeding. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure assembly of the present invention; Figure 2 This is a three-dimensional structural diagram of the tensioning feeder unit of the present invention; Figure 3This is a three-dimensional structural diagram of the base plate on which the segmented feeding unit of the present invention is located; Figure 4 This is a three-dimensional structural diagram of the segmented feeding unit of the present invention; Figure 5 This is a schematic diagram of the planar structure of the segmented feeding unit of the present invention; Figure 6 This is a three-dimensional structural diagram of the segmented feeding unit of the present invention when the lifting plate is removed; Figure 7 This is a three-dimensional structural diagram of the material pushing and positioning unit of the present invention; Figure 8 This is a front view of the bending unit of the present invention; Figure 9 This is a top view of the bending unit of the present invention. Detailed Implementation

[0016] The following will be based on embodiments of the present invention. Figure 1-9 The technical solutions in the embodiments of the present invention are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0017] It should be noted that, unless otherwise stated herein, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0018] In this document, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0019] A chip-free short U-shaped collar automatic forming integrated machine, such as Figure 1As shown, the system includes a frame 1 and a base plate 2 located at the upper left end of the frame 1. The upper right end of the frame 1 is equipped with a ring-fitting unit 10 for fitting welding rings onto the formed short U-shaped rings. The base plate 2, from right to left, is equipped with a tensioning feeding unit 3, a cutting unit 4, a slitting feeding unit 5, a pushing and positioning unit 6, and a bending unit 7. Both the frame 1 and the base plate 2 have guide frames 8 at their right ends for guiding the tube material during feeding. To improve the quality of the short U-shaped rings and eliminate bending deformation of the tube, a straightening and rounding device 9 is located to the right of the tensioning feeding unit 3 on the right end of the base plate 2 and is used to straighten and round the tube material. The material tube is tensioned and fed into the cutting unit 4 by the tensioning feeder unit 3 for cutting. The cutting unit 4 clamps the cut short tube and clamps it with the splitting feeder unit 5. During the downward movement of the splitting feeder unit 5, the short tube that is not completely cut is split. The discharge side of the splitting feeder unit 5 corresponds vertically to the feed side of the pusher positioning unit 6, which is in the initial position. When the short tube falls into the pusher positioning unit 6 and is pushed to the bending unit 7, the feeding needle 6-4 in the pusher positioning unit 6 and the positioning needle in the bending unit 7 extend to the straight section to be formed at both ends of the short tube to prevent displacement during bending.

[0020] like Figure 2As shown, the specific structure of the circle and straightening device 9 is as follows: The circle and straightening device 9 includes a calibration frame 9-1, a guide sleeve 9-2, a circle alignment wheel set 9-3, and a straightening wheel set 9-4. The lower end of the calibration frame 9-1 is fixed to the base plate 2, and the right ends of the multiple mounting vertical plates 9-12 arranged parallel to the length direction of the base plate 2 at the upper end of the calibration frame 9-1 are all centrally fixed with side plates 9-11. The straightening wheel sets 9-4 and circle alignment wheel sets are installed on both sides of the mounting vertical plates 9-12. 9-3, symmetrical guide sleeves 9-2 are fixed on the side plate 9-11, corresponding to the positions of the rounding wheel group 9-3, for the pipe to pass through and guide it. The pipe passes through the guide sleeves 9-2 and passes sequentially through the corresponding rounding wheel group 9-3 and straightening wheel group 9-4 for rounding and straightening respectively. The rounding wheel group 9-3 includes two rounding wheels 9-31 with corresponding semi-circular grooves on their surfaces, distributed vertically. The two rounding wheels 9-31 are rotatably mounted on the side wall of the mounting vertical plate 9-12. The semi-circular grooves on the rollers align to form a circular groove that fits the pipe. The straightening wheel assembly 9-4 includes three straightening wheels 9-41 arranged in a triangle, each with corresponding arc-shaped grooves on its surface. The straightening wheels 9-41 are rotatably mounted on the side wall of the mounting vertical plate 9-12 and straighten the pipes passing through them. The guide sleeve 9-2 includes a central equal-diameter sleeve, a large conical sleeve with a right-end diameter greater than its left-end diameter, and a small conical sleeve with a right-end diameter greater than its left-end diameter. The left end face of the small conical sleeve has a discharge hole that communicates with the inside of the guide sleeve 9-2 and is used for the tube to pass through. Since the metal tube is relatively long, it may jump during the feeding process due to unstable tension. Therefore, the right end of the guide sleeve 9-2 is designed as a large conical sleeve structure with a right end diameter larger than the left end diameter to provide a margin for tube feeding. The circular discharge hole on the left end face of the guide sleeve 9-2 is used to guide the tube while ensuring that its position corresponds to the alignment wheel set 9-3. By setting a rounding and straightening device 9 at the feeding position, the pipe can be rounded and straightened in sequence. This can correct any morphological defects that may exist in the pipe, such as bending or non-roundness, and keep the pipe in a regular cylindrical structure. This provides a qualified raw material shape basis for the stable clamping and precise feeding of the subsequent clamping mold assembly, and avoids the feeding stability being affected by the shape of the pipe.

[0021] In traditional forming machines, a linear motor drives the feeding mechanism, causing the feeding cylinder, which clamps the tube, to move along the feeding mechanism to the left guide rail, thus feeding the tube to the cutting head. When the previous cutting process is completed and the next feeding process begins, the feeding cylinder releases the tube and moves to the right along the guide rail to the initial position under the drive of the linear motor. The feeding cylinder then clamps the tube again, and the above process is repeated to continue feeding, completing the next feeding process. However, during this process, when the feeding cylinder releases the metal tube and moves to the right to reset, the tube is in a relaxed state. Due to the relatively long length of the tube, it is prone to jumping and backward displacement when it is in a relaxed state, resulting in poor feeding stability and poor length accuracy of short tubes that need to be cut to a fixed length, which seriously affects the feeding accuracy. Therefore, our unit designed a tensioning feeding unit 3. like Figure 2 As shown, the specific structure of the tensioning feeder unit 3 is as follows: The tensioning feeder unit 3 includes a feed drive assembly 3-1, a clamping mold assembly 3-2, and a clamping mold assembly 3-3, which are rotatably supported on the feed side plate of the right end of the base plate 2. The moving part of the feed drive assembly 3-1 is fixedly connected to a moving plate 3-4 that is guided and installed along the length direction of the base plate 2. The clamping mold assembly 3-2, which is used to clamp the pipe, is installed on the moving plate 3-4 and is driven by the feed drive assembly 3-1 to reciprocate along the length direction of the base plate 2. A fixed frame 3-5 is provided on the right end plate of the base plate 2, located on the right side of the feed drive assembly 3-1, and is used to clamp the pipe. The second clamping mold assembly 3-3 holding the pipe is installed on the fixed frame 3-5. With the alternating clamping of the pipe by the second clamping mold assembly 3-3 and the first clamping mold assembly 3-2, the pipe is stably fed. In the above structure, by setting the movable first clamping mold assembly 3-2 driven by the feed drive assembly 3-1, and the second clamping mold assembly 3-3 fixed on the fixed frame 3-5, the two alternately clamp the pipe for feeding, avoiding the pipe from becoming loose in the feeding cycle. This fundamentally solves the problem of pipe jumping and backward displacement, ensures accurate positioning of the pipe during feeding, avoids the problem of poor short pipe length cutting accuracy caused by feeding deviation, and provides a basic guarantee for the subsequent chipless short U-ring forming quality. like Figure 2 As shown, the specific structure of the feed drive assembly 3-1 is as follows: The feed drive assembly 3-1 includes a motor 3-11 and a lead screw 3-12 arranged parallel to the length direction of the base plate 2. The two ends of the lead screw 3-12 are rotatably supported on the upright plate 3-14 of the base plate 2 through bearing seats 3-13. The nut seat 3-15 adapted to the lead screw 3-12 is fixedly connected to the moving plate 3-4. Under the drive of the motor 3-11, the nut seat 3-15 drives the moving plate 3-4 and the clamping mold assembly 3-2 to reciprocate along the length direction of the base plate 2. The guide installation structure of the movable plate 3-4 on the base plate 2 is as follows: two fixed long plates 3-6 are fixed on the surface of the base plate 2, which are symmetrically distributed on both sides of the feed drive assembly 3-1, and the guide rail 3-7 is installed on the upper surface of the fixed long plate 3-6. The bottom surfaces of both ends of the movable plate 3-4 are fixedly connected to the slider 3-8 adapted to the guide rail 3-7 on the same side. The fixed frame 3-5 is a slot-shaped frame with an opening facing downward, which spans the right end of the two guide rails 3-7. The lower ends of the multiple brackets 3-16 evenly distributed along the length of the fixed frame 3-5 in the clamping assembly 3-3 are fixedly connected to the upper surface of the fixed frame 3-5. The clamping mold assembly 3-3 includes multiple slotted supports 3-31 with downward-facing openings, a cylinder 3-32 fixed to the upper surface of the supports 3-31, and fixed clamping molds 3-33 and movable clamping molds 3-34 distributed from bottom to top inside the supports 3-31. The upper surface of the fixed clamping mold 3-33 and the lower surface of the movable clamping mold 3-34 are both provided with corresponding and equal numbers of arc-shaped clamping grooves 3-35. The fixed clamping mold 3-33 is installed on the upper surface of the fixed frame 3-5, and the telescopic rod of the cylinder 3-32 passes through the through hole on the supports 3-31 and is fixedly connected to the movable clamping mold 3-34. Under the lifting and lowering action of the movable clamping mold 3-34 driven by the cylinder 3-32, the pipes located in the arc-shaped clamping grooves 3-35 at the upper and lower corresponding positions are clamped or released. The clamping mold assembly 3-3 and the clamping mold assembly 3-2 have the same structure. Both are driven by cylinder 3-32 to move the movable clamping mold 3-34 to clamp the pipe located between the movable clamping mold 3-34 and the fixed clamping mold 3-33.

[0022] The specific work process is as follows: 1) Preliminary preparation: Before the device is started, the pipe is pre-passed through the roundness and straightness device 9 located on the right side of the fixed frame 3-5 at the right end of the base plate 2, and is initially positioned after being guided by the guide sleeve 9-2; at this time, the clamping mold assembly 2 3-3 fixed on the fixed frame 3-5 is started, and its cylinder 3-32 drives the movable clamping mold 3-34 to rise, so that the pipe passes through the arc-shaped clamping groove 3-35 and extends into the clamping mold assembly 1 3-2 located in the initial position; Alternating clamping and feeding cycle: Clamping assembly 3-2 on the moving plate 3-4 (with the same structure as clamping assembly 3-3) synchronously clamps the tube; then, the motor 3-11 of the feed drive assembly 3-1 starts, driving the lead screw 3-12 to rotate. The nut seat 3-15 on the lead screw 3-12 drives the moving plate 3-4 to move to the left along the length of guide rail 3-7, thereby causing clamping assembly 3-2 to carry the tube a specified distance in the processing direction; after the material is fed into place, the clamping assembly... When component 2 3-3 is started, its cylinder 3-32 drives the movable clamping mold 3-34 to descend, so that the movable clamping mold 3-34 and the fixed clamping mold 3-33 clamp the pipe. After the cutting is completed, clamping mold component 1 3-2 releases the pipe, and the moving plate 3-4 moves to the right and resets under the drive of the feed drive component 3-1. After the moving plate 3-4 returns to the initial position, clamping mold component 1 3-2 clamps the pipe again, and clamping mold component 2 3-3 releases the pipe. The above process is repeated to achieve stable and continuous conveying of the pipe. Pipe shape calibration: During the continuous conveying of the pipe, it will continuously pass through the roundness and straightness calibration device. First, it passes through the roundness calibration wheel group 9-3 (two roundness calibration wheels 9-31 with semi-circular grooves on the upper and lower sides to correct the roundness of the pipe), and then it passes through the straightness calibration wheel group 9-4 (three straightness calibration wheels 9-41 distributed in a triangle to correct the bending of the pipe). This ensures that the pipe shape is regular when it is conveyed to the subsequent processing stage and meets the processing accuracy requirements.

[0023] In traditional forming machines, after the material is cut, the incompletely cut portion is pulled off and flared by the leftward movement of the clamping position in the flaring unit. After that, the short pipe is released and falls into the bending unit, and then pushed into the bending station by the pushing mechanism. In actual production, it was found that because the incompletely cut portion is pulled off by clamping both ends of the cutting position and then horizontally moving the flaring unit to the left, wear on the mold clamping position can lead to insufficient clamping force and slippage, causing the material to not be pulled off completely. This results in the inability to connect the various processes in an orderly manner, affecting production efficiency. Therefore, our unit designed a split feeding unit 5. like Figure 3-6As shown, the specific structure of the segmented feeding unit 5 is as follows: The segmented feeding unit 5 includes a cylinder clamp (which clamps the pipe fittings when the cutting unit 4 cuts them, including a cylinder, a movable clamping plate connected to the cylinder, and a fixed clamping plate that cooperates with the movable clamping plate; this part adopts the existing clamping structure) with a lifting plate 5-1 on the left side, which is arranged parallel to the width direction of the base plate 2 and located on the discharge side of the cutting unit 4. The first clamping head group 5-2 and the second clamping head group 5-3 arranged below the lifting plate 5-1 respectively cooperate with each other. The guide assembly is adjustablely installed at the bottom of the lifting plate 5-1. Two small cylinders 5-4 are symmetrically fixed to the upper surface of the lifting plate 5-1. The telescopic ends of the two small cylinders 5-4 are respectively fixedly connected to the first chuck group 5-2 and the second chuck group 5-3 via connecting plates 5-5 that pass through guide holes 5-6 at corresponding positions on the surface of the lifting plate 5-1. The short pipe is clamped or released when the two small cylinders 5-4 drive the first chuck group 5-2 and the second chuck group 5-3 to move in opposite directions. The lifting plate 5-1 is supported on the base plate 2 at both ends by lifting devices. The short pipe cut by the cutting component 4 is clamped and moved downward by the first clamp group 5-2 and the second clamp group 5-3 driven by the lifting device, realizing the short pipe displacement, cutting and downward feeding. In the above structure, by setting the first clamp group 5-2 and the second clamp group 5-3 below the lifting plate 5-1 and driving them to move in opposite directions by two small cylinders 5-4, the short pipe before and after cutting is stably clamped. Then, the lifting plate 5-1 and the first clamp group 5-2 and the second clamp group 5-3 are moved up and down by the lifting device, so as to reliably cut the incompletely cut part of the short pipe and move it downward by using the shearing force during downward movement. This avoids the problem of pipe slippage and breakage caused by insufficient clamping force during horizontal movement due to mold wear in the original structure, ensuring orderly connection of each process and guaranteeing production progress. The method of short pipe cutting and feeding is optimized to realize the simultaneous downward cutting and downward feeding of short pipe, eliminating the gap between processes and improving production continuity. To meet the limiting requirements for the outward movement of the first chuck assembly 5-2 and the second chuck assembly 5-3 when clamping short pipes of different diameters, a limiting adjustment device is provided on the outer sides of both ends of the first chuck assembly 5-2 and the second chuck assembly 5-3. This device is mounted on the bottom surface of the lifting plate 5-1 and used to adjust and limit the outward movement of the first chuck assembly 5-2 and the second chuck assembly 5-3. Specifically, the limiting adjustment device includes a limiting bolt 5-7. Two mounting vertical plates 5-8 are symmetrically fixed on the bottom surface of the lifting plate 5-1, and the first chuck assembly 5-2 and the second chuck assembly 5-3 are located between the two mounting vertical plates 5-8. The limiting bolt 5-7, with its larger end facing outward, is adapted to connect with the threaded hole on the surface of the mounting vertical plate 5-8. The first chuck assembly 5-2 and the second chuck assembly 5-3 are... The distance between the two ends of 5-3 and the small end of the corresponding limiting bolt 5-7 is adjusted by rotating the corresponding limiting bolt 5-7. The outer side of the mounting vertical plate 5-8 is provided with a locking nut 5-9 that is adapted to be connected to the limiting bolt 5-7 and used to lock and fix the limiting bolt 5-7 in position adjustment. In the above structure, the distance between the small end of the limiting bolt 5-7 and the two ends of the first clamp group 5-2 and the second clamp group 5-3 can be adjusted by rotating the limiting bolt 5-7. The outward movement of the two clamping plates 5-13 can be precisely controlled. Under the premise of ensuring reliable clamping of the short pipe, the short pipe can be released smoothly with the minimum outward movement. It is suitable for use with short pipes of different diameters. There is no need to replace the overall structure of the clamping group, which improves the versatility and applicability of the device and reduces the cost of equipment replacement and maintenance. The specific structure of the guide assembly is as follows: The guide assembly includes a slider bearing 5-10 and a guide rail 5-11. Multiple slider bearings 5-10 are fixed on the bottom surface of the lifting plate 5-1, and the guide rail 5-11 is adapted to the multiple slider bearings 5-10. The upper ends of the first chuck group 5-2 and the second chuck group 5-3 are respectively fixedly connected to the guide rail 5-11 in the guide assembly at the corresponding positions. The slider bearings 5-10 and the guide rail 5-11 are adapted to provide precise guidance for the movement of the first chuck group 5-2 and the second chuck group 5-3. This can effectively avoid problems such as offset and jamming during the movement of the first chuck group 5-2 and the second chuck group 5-3 in opposite directions, ensuring that the first chuck group 5-2 and the second chuck group 5-3 always move smoothly along the preset trajectory, thereby ensuring the accurate clamping position of the short tube and improving the stability of the short tube clamping and subsequent transfer.

[0024] The specific structure of the lifting device is as follows: The lifting device includes a large air cylinder 5-16. The lower end of the large air cylinder 5-16 is fixed to the base plate 2 through a cylinder seat 5-17, and the telescopic part of the upper end of the large air cylinder 5-16 is fixedly connected to the corresponding end of the lifting plate 5-1. Under the telescopic control of the large air cylinder 5-16, the lifting plate 5-1 can be raised and reset or lowered and fed separately. A guide rod 5-18 is also fixed on the cylinder seat 5-17. It is located outside the large air cylinder 5-16 and passes through the guide hole on the corresponding end plate of the lifting plate 5-1. This ensures the stability of the first chuck group 5-2 and the second chuck group 5-3 when clamping and moving the short pipe downward, so as to realize the short pipe displacement, breaking and downward feeding. The specific structures of the first chuck assembly 5-2 and the second chuck assembly 5-3 are as follows: Both the first chuck assembly 5-2 and the second chuck assembly 5-3 include a mounting plate 5-12 and clamping plates 5-13. The mounting plate 5-12 is fixed to the bottom of the guide rail 5-11 in the guide assembly, and the upper ends of multiple clamping plates 5-13 are fixed to the bottom of the mounting plate 5-12. The lower ends of the clamping plates 5-13 in the first chuck assembly 5-2 and the second chuck assembly 5-3 have corresponding arc-shaped grooves 5-15 on their facing sides. The lower ends of the two connecting plates 5-5 are respectively fixedly connected to the mounting plates 5-12 in the first chuck assembly 5-2 and the second chuck assembly 5-3. When the two small cylinders 5-4 move towards or away from each other, the two clamping plates 5-13 clamp or release the short pipe located in the arc-shaped long groove 5-15. The two ends of the cylinder body of the small cylinder 5-4 are fixed to the lifting plate 5-1 by L-shaped plates 5-14. The arc-shaped long groove 5-15 is designed to fit the outer wall of the short pipe during clamping and achieve stable clamping, avoiding the short pipe from shifting or slipping during clamping or transfer. The two clamping plates 5-13 are connected to the telescopic ends of the small cylinders 5-4 by connecting plates 5-5, and can accurately move towards or away from each other under the drive of the small cylinders 5-4. The clamping force can be controlled by adjusting the telescopic amount of the small cylinders 5-4 to avoid the short pipe from deforming due to excessive clamping force or slipping due to insufficient clamping force. The clamping plate 5-13 in the first clamping assembly 5-2 has an L-shaped plate structure, and the horizontal plate at the upper end of the clamping plate 5-13 extends outward along the thickness direction of its vertical plate. The clamping plate 5-13 in the second clamping assembly 5-3 includes an L-shaped plate and a fixing plate fixed to the outer end of the horizontal plate at the upper end of the L-shaped plate. The horizontal plate at the upper end of the clamping plate 5-13 extends outward along the width direction of its vertical plate. The fixing plate of the clamping plate 5-13 in the second clamping assembly 5-3 is fixedly connected to the corresponding mounting long plate 5-12. This part has a simple structure, novel design, compact structure, good stability, and tight process connection, which is conducive to improving the production efficiency of chipless short U-rings, reducing equipment maintenance costs and replacement costs of vulnerable parts, and has high use value.

[0025] In existing forming machines, a rotary motor drives a cutting head to cut the tube to be processed. During the cutting and breaking process, a flaring unit shapes the short tube. After that, the short tube falls into the bending unit, and the shaped tube is pushed into the servo bending mechanism by a pushing mechanism. The bending servo motor driver bends the tube to form a U-shape. Since there is no positioning structure at both ends of the short tube in the mold, it is easy for the two ends of the short tube to slip during bending. For such short tubes, even a small displacement will significantly affect the difference in the length of the straight segments, resulting in a quality defect in the short U-shaped collar with two straight segments of different lengths. Therefore, our unit designed a pushing and positioning unit 6. like Figure 7 As shown, the specific structure of the feeding and positioning unit 6 is as follows: The feeding and positioning unit 6 includes a feeding plate 6-1 guided and installed on the base plate 2 and a receiving plate 6-2 located on the left side of the feeding plate 6-1. The feeding plate 6-1 and the receiving plate 6-2 are connected as one unit through a feeding drive device at the bottom, which can be adjusted in distance. An adjustment device is installed on the base plate 2, and the moving part of the adjustment device is fixedly connected to the feeding plate 6-1 or the receiving plate 6-2. Under the drive of the adjustment device, the feeding plate 6-1 and the receiving plate 6-2 move to the left synchronously to the feeding position of the bending unit 7. The upper end face of the receiving plate 6-2 is provided with a plurality of receiving grooves 6-3 along its length direction for receiving the short pipes that are clamped and moved downward and cut by the first clamp group 5-2 and the second clamp group 5-3 in the cutting and feeding unit 5. The feeding plate 6-1 is equipped with a feeding groove 6-2. The feeding needles 6-4, which are the same number and position as the receiving grooves 6-3, are driven by the pushing drive device to push the pushing plate 6-1 and move the feeding needles 6-4 to the left towards the receiving plate 6-2. During this process, the left end of the feeding needle 6-4 is adapted and positioned within the straight section to be formed on the right end of the short tube and pushed into the forming groove in the bending unit 7. During the bending process, the short tube is positioned against slippage by the feeding needles 6-4 extending into the straight section on the right end and the positioning needles located in the bending unit 7 extending into the straight section on the left end. The pushing plate 6-1 is equipped with multiple unloading drive devices. The right end of the unloading needles 6-5, which are the same number and position as the receiving grooves 6-3, is fixedly connected to the unloading drive device at the corresponding position. Under the drive of the unloading drive device, the left-moving unloading needles 6-5 push the bent short U-shaped collar out of the forming groove.

[0026] like Figure 7As shown, the specific structure of the pusher drive device and the adjustment device is as follows: The pusher drive device includes two symmetrically arranged sensorless cylinders 6-6. The left end of the sensorless cylinder 6-6 is fixedly connected to the bottom of the receiving plate 6-2, and the slider of the sensorless cylinder 6-6 is fixedly connected to the pusher plate 6-1. Under the control of the sensorless cylinder 6-6, the pusher plate 6-1 moves towards or away from the receiving plate 6-2. The setting of the sensorless cylinder 6-6 provides conditions for adjusting the distance between the receiving plate 6-2 and the pusher plate 6-1. After the receiving plate 6-2 and the pusher plate 6-1 reach the unloading position of the bending process, by controlling the pusher plate 6-1 to move to the left, the feeding needle 6-4 and the unloading needle 6-5 move to the left synchronously. The feeding needle 6-4 pushes the short tube in the receiving groove 6-3 into the forming groove to complete the unloading action. The specific structure of the adjustment device is as follows: The adjustment device includes a sensorless cylinder 6-7 fixed on the base plate 2. The sensorless cylinder 6-7 is arranged perpendicular to the length direction of the push plate 6-1 and the receiving plate 6-2, and a transition plate 6-8 fixedly connected to the slider of the sensorless cylinder 6-7 is fixedly connected to the receiving plate 6-2 or the push plate 6-1. Figure 7 As shown, the right end plate of the transition plate 6-8 is fixedly connected to the slider of the sensorless cylinder 6-7, while the connecting plate of the left end plate of the transition plate 6-8, which is higher than the right end plate, is fixedly connected to the bottom of the receiving plate 6-2. Under the control of the sensorless cylinder 6-7, the pushing plate 6-1 and the receiving plate 6-2 move to the left or right synchronously. like Figure 7 As shown, the specific structure of the unloading drive device is as follows: The unloading drive device includes multiple ultra-thin cylinders 6-9 and an unloading push plate 6-10. Multiple mounting grooves are formed on the surface of the push plate 6-10, and the ultra-thin cylinders 6-9 are located within the mounting grooves and fixedly connected to the push plate 6-10. The unloading push plate 6-10 has a T-shaped structure, and the lower end of the unloading push plate 6-10, which is adapted to the guide of the mounting groove, is fixedly connected to the piston rod of the ultra-thin cylinders 6-9. Two unloading needles 6-5 are fixed on the upper left side wall of the unloading push plate 6-10. When the bent short U-shaped collar is unloaded, the left end of the unloading needle 6-5 is driven by the ultra-thin cylinder 6-9 to move to the left against the inner ring surface of the short U-shaped collar and push it out of the forming groove. When the piston rod of the ultra-thin cylinder 6-9 extends and retracts, the unloading push plate 6-10 cooperates with the mounting groove to achieve the guiding purpose, thereby improving the stability of the left and right movement of the unloading needle 6-5 and achieving precise pushing of the formed short U-shaped collar.

[0027] The pusher drive device can drive the pusher plate 6-1 to automatically push the short tube to the forming groove of the bending process via the feeding needle 6-4. The unloading drive device can drive the unloading needle 6-5 to automatically push the bent short U-shaped collar out of the forming groove, reducing manual intervention and realizing the automated connection of short tube pushing, bending positioning, and finished product unloading, reducing labor intensity and improving processing efficiency. The pusher plate 6-1 and the receiving plate 6-2 can be adjusted in distance through the bottom pusher drive device. The adjustment device can drive both to move to the left synchronously to the feeding position of the bending process. The distance and overall position of the pusher plate 6-1 and the receiving plate 6-2 can be adjusted according to the different specifications of the short tube, adapting to the processing needs of short U-shaped collars of different sizes, and has a wide range of applications. The guide installation structure of the pusher plate 6-1 and the receiving plate 6-2 on the base plate 2 is as follows: Two guide rails 6-11 are symmetrically fixed on the base plate 2, and two sliding blocks 6-12 adapted to the guide rails 6-11 are fixedly connected to the corresponding ends of the pusher plate 6-1 and the receiving plate 6-2 respectively through the pad 6-13. Under the drive of the pusher drive device or the adjustment device, the pusher plate 6-1 or the pusher plate 6-1 and the receiving plate 6-2 move along the length direction of the guide rails 6-11.

[0028] The receiving structure of the receiving plate 6-2 and its connection structure with the unloading needle 6-5 and the feeding needle 6-4 are as follows: Positioning plates 6-14 are fixed to both sides of the upper surface of the receiving plate 6-2, located at the two ends of the receiving groove 6-3. Each of the two positioning plates 6-14 has corresponding upper needle holes 6-15 and lower needle holes 6-16 distributed vertically. The lower needle hole 6-16 corresponds to the position of the receiving groove 6-3, and the upper needle hole 6-15 corresponds to the inner ring of the bent short U-shaped collar. When the receiving plate 6-2 is in the receiving position, the left ends of the unloading needle 6-5 and the feeding needle 6-4 are respectively located in the lower needle hole 6-16 and the upper needle hole 6-15 on the right positioning plate 6-14. With the cooperation of the feeding needle 6-4 and the lower needle hole 6-16, this structure provides conditions for the short tube falling into the receiving groove 6-3 to be automatically removed from the receiving groove 6-3, and with the cooperation of the unloading needle 6-5 and the upper needle hole 6-15, it provides conditions for the automatic unloading of the formed short U-shaped collar.

[0029] The specific structure for anti-slip positioning of the straight sections at both ends of the short tube is as follows: The feeding needle 6-4 is a stepped round rod structure with a left end diameter smaller than the right end diameter. During bending of the short tube, the feeding needle 6-4, with its smaller diameter section extending into the straight section to be formed and the stepped surface formed at its left end contacting the right end of the short tube, provides anti-slip positioning for the straight section at the right end of the short tube. Specifically, the larger diameter section at the left end of the positioning needle has an external thread, and the left end of the positioning needle, coaxially arranged with the feeding needle, is threadedly fixed to the mounting plate of the bending process. The anti-slip positioning structure at the right end of the positioning pin is the same as that at the left end of the feeding pin 6-4. In the above structure, by setting the feeding pin 6-4 to cooperate with the positioning pin in the bending process, the left end of the feeding pin 6-4 is adapted to be positioned within the straight segment to be formed on the right end of the short tube, and the positioning pin extends into the straight segment to be formed on the left end of the short tube. The double positioning structure can effectively prevent the short tube from slipping during the bending process, avoid the problem of length difference in the straight segment of the formed short U-shaped collar due to displacement, ensure that the two straight segments of the short U-shaped collar are consistent in size, and improve the product qualification rate. In this part of the structure, the receiving plate 6-2 receives the short pipe of the cutting feeding unit 5 through the receiving groove 6-3, and the pushing drive device drives the pushing plate 6-1 to push the short pipe in the receiving groove 6-3. The unloading structure completes the unloading of the finished product. All the structures work together to make the feeding, positioning, bending and unloading process of the short U-ring processing smooth and orderly, reduce process interruption, improve the overall processing smoothness, and improve the forming quality and processing efficiency of the short U-ring.

[0030] In traditional forming machines, the bending shaft in the bending mechanism is rotated by a motor via a belt drive assembly and a chain connected to both ends of the belt drive assembly, which drives the large sprockets at both ends of the bending shaft. This transmission structure has several drawbacks in actual operation. First, due to the elasticity of the belt, the transmission ratio becomes unstable during transmission. Furthermore, the meshing clearance between the gear and toothed belt in forward and reverse transmission results in large forward and reverse errors, significantly impacting transmission accuracy. Second, the large transmission clearance between the chain and sprockets affects transmission efficiency and accuracy. Given the large span of the bending mechanism, these two factors combined cause the bending shaft to deflect, especially due to different bending forces at both ends, affecting the bending quality and accuracy of multiple short U-shaped collars formed in the same batch. Therefore, the power drive section of this bending machine unit 7 has been improved. like Figure 8-9As shown, the specific structure of the bending unit 7 is as follows: The bending unit 7 includes a compensating power drive device and a bending mechanism (this part is an improved existing structure and will not be described in detail here). The compensating power drive device includes a main power drive unit 7-1 and a power compensation unit 7-2 located on both sides of the upper end face of the base plate 2. The bending mechanism includes a bending clamping die assembly 7-3 and a bending assembly 7-4. Between the main power drive unit 7-1 and the power compensation unit 7-2 are the bending clamping die assembly 7-3 mounted on the base plate 2 and the bending assembly 7-4 rotatably supported on the base plate 2 at both ends and located outside the bending clamping die assembly 7-3. The output shaft of the main power drive unit 7-1 is fixedly connected to one end of the bending shaft 7-41 in the bending assembly 7-4, and the other end of the bending shaft 7-41 is connected to the power compensation unit 7-2. The bending assembly 7-4 is rotated under the synchronous action of the 7-2 component, realizing the bending and forming of the pipe to be processed held by the bending clamping die assembly 7-3 during the rotation of the bending assembly 7-4. In the above structure, by optimizing the structure of the power drive part in the bending mechanism, the main power drive unit 7-1 and the power compensation unit 7-2 located at both ends of the bending shaft 7-41 synchronously drive the bending shaft 7-41 to rotate. The synchronous power at both ends eliminates the deflection of the bending shaft 7-41, and the direct transmission reduces errors, ensuring the consistency of force and deformation of the same batch of workpieces during the bending process. This solves the problem of uneven driving force at both ends of the bending shaft 7-41 causing deflection in the traditional drive structure, improves the forming quality of the short U-shaped collar, ensures the rotation stability of the bending mechanism, reduces component wear caused by the deflection of the bending shaft 7-41, extends the service life of the core components of the equipment, reduces maintenance costs, and meets the requirements of high-precision processing. In this design, only the structure of the compensating power drive device is improved, while the specific structures of the bending clamping die assembly 7-3 and the bending assembly 7-5 remain the same as the existing structures. Moreover, the structures of these two parts are unrelated to the technical problem of deflection during rotation caused by uneven bending force when the bending shaft 7-41 is driven. Therefore, the specific structures will not be described in detail here. like Figure 8-9As shown, the active power drive unit 7-1 includes a servo motor 7-11 and a reducer 7-12. The reducer 7-12 is supported on the base plate 2, and the output shaft of the servo motor 7-11, which is fixed to the housing of the reducer 7-12, is fixedly connected to the input shaft of the reducer 7-12. The output shaft of the reducer 7-12 is fixedly connected to one end of the bending shaft 7-41. In the above structure, the servo motor 7-11 itself has high-precision speed and angle control capabilities, which can directly meet the requirement of precise control of the rotation angle of the bending shaft 7-41 when the short U-shaped collar is bent. The reducer 7-12 can amplify the output torque of the servo motor 7-11 to make up for the problem of insufficient torque of the servo motor 7-11. The two work together to output high-precision, high-torque driving force to the bending shaft 7-41, ensuring that the bending assembly 7-5 can stably complete the flipping action. like Figure 8-9 As shown, the power compensation unit 7-2 includes a cylinder 7-21, a rack 7-22, and a gear 7-23. The cylinder 7-21 is located outside the other end of the bending shaft 7-41 and fixed to the base plate 2. The piston rod end of the cylinder 7-21 is fixedly connected to the corresponding end of the rack 7-22, which is guided and mounted on the base plate 2 and spatially perpendicular to the bending shaft 7-41. The gear 7-23 fixed to the other end of the bending shaft 7-41 meshes with the rack 7-22. Under the extension and retraction of the piston rod of the cylinder 7-21, the rack 7-22 and the gear 7-23 work together to assist the bending shaft 7-41 in its rotational motion. The rack and gear mechanism driven by the cylinder 7-21 provides assist to the other end of the bending shaft 7-41. When the main power drive unit 7-1 operates, it synchronously outputs auxiliary torque to ensure the driving force at both ends of the bending shaft 7-41. The size and direction are matched, completely avoiding the deflection of the bending shaft 7-41 caused by single-end drive or uneven transmission from the perspective of dual-end power coordination. When the pipe to be processed is bent, its deformation resistance will dynamically fluctuate with the bending angle. If only the main power drive unit 7-1 is used for driving, there may be problems such as insufficient power at peak resistance leading to incomplete bending or the motor running idle and wasting energy at low resistance. This avoids the risk of motor overload damage and reduces maintenance frequency and cost. The cylinder drive structure has a fast response speed and dynamically supplements torque, so that the driving force of the bending shaft 7-41 is always matched with the actual needs, ensuring smooth and continuous bending action. It can ensure that the turning angle of the bending shaft 7-41 is precise and controllable, further reducing the forming error of the same batch of workpieces and improving quality consistency. The operator does not need complicated calibration during installation and can quickly locate and replace faulty parts during maintenance. The base plate 2 is provided with a guide block 7-5, and the bottom of the rack 7-22 is adapted to the guide groove of the guide block 7-5.

[0031] To ensure that the rotation angle of the bending shaft 7-41 driven by the cylinder 7-21 is the same as the rotation angle driven by the servo motor 7-11, thereby guaranteeing the rotation accuracy of the bending shaft 7-41, a wire encoder is fixed on the cylinder body of the cylinder 7-21, and the wire end of the wire encoder is fixed to the end of the rack 7-22. The rotation angle of the bending shaft 7-41 when the active force drive unit 7-1 drives it to rotate is equal to the linear distance obtained by converting the pitch circle diameter of the gear 7-23, and the linear distance of the rack 7-22 movement detected by the wire encoder.

[0032] The wire encoder detects the movement distance of rack 7-22 in real time (i.e., the action feedback of power compensation unit 7-2), and this distance must be perfectly matched with the linear distance converted from the rotation angle of bending shaft 7-41 caused by main force drive unit 7-1. This matching relationship provides a quantitative standard for the synchronous action of the two, avoiding the synchronization deviation that may occur if only mechanical structure (such as gear meshing) is relied upon, and ensuring that main force drive unit 7-1 (main driving force) and power compensation unit 7-2 (compensation power) are fully coordinated in terms of action timing and force transmission. The wire encoder is directly fixed to the cylinder body of cylinder 3-1, without occupying additional equipment space, and its connection method with rack 7-22 is simple (only the wire end needs to be fixed). At the same time, the detection and distance conversion of the wire encoder are mature automated control technologies, without the need for complex mechanical calibration structures.

[0033] like Figure 1 As shown, the base plate 2 is inclined and supported on the upper left side of the frame 1, with the left side lower than the right side. The guide frame 8, fixed to the right side of the base plate 2, is parallel to the base plate 2. The guide frame 8 includes a bracket 8-1 and a long shaft 8-2 rotatably mounted on the bracket 8-1. Support plates 8-3 are installed on the upper two side walls of the bracket 8-1 through oblong holes and bolts, and the two ends of the long shaft 8-2 are installed on the upper end of the support plate 8-3. Multiple guide wheels 8-4 for supporting and guiding the pipe material are rotatably mounted on the long shaft 8-2. Guardrails are provided on both long sides of the base plate 2 and the frame 1, and a double-door guardrail is provided on the left side of the base plate 2, which improves the safety of the equipment when starting production.

[0034] A chain plate elevator is installed at the rear of the frame 1. The lower feed side of the chain plate elevator is located at the discharge side of the bending unit 7, while the upper discharge port of the chain plate elevator is guided to the ring storage station outside the ring-shearing unit 10 via a guide chute. The ring-shearing unit 10 then fits a welding ring onto the formed short U-shaped ring. The ring-shearing unit 10 adopts an existing structure and will not be described in detail here.

[0035] This technical solution employs an optimized tensioning feeder unit 3, a segmenting feeder unit 5, and a pushing and positioning unit 6, all mounted on the base plate 2. This solves the quality defects of traditional equipment, such as the impact of pipe feeding jumps and shifts on short pipe cutting accuracy and the inconsistent lengths of the two straight segments of the formed short U-shaped collar. The segmenting feeder unit's clamping and downward feeding method for the short pipe significantly reduces wear on the clamping parts. It integrates multiple processes, simplifies the workflow, reduces costs, improves feeding stability and short pipe cutting accuracy, ensures forming quality, guarantees smooth transitions between processes, and improves production efficiency. Furthermore, by optimizing the power drive structure and adopting a compensating power drive device, it solves the problem of uneven driving force at both ends of the bending shaft 7-41 causing deflection, which is a problem in traditional drive structures. This improves the forming quality of the short U-shaped collar, ensures the stability of the bending mechanism's flipping, reduces component wear caused by the deflection of the bending shaft 7-41, extends the service life of core components, reduces maintenance costs, and meets the requirements of high-precision processing.

[0036] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A chipless short U-shaped collar automatic forming integrated machine, characterized in that: The machine includes a frame and a base plate located at the upper left end of the frame. A collar assembly for fitting welding rings onto formed short U-shaped collars is located at the upper right end of the frame. From right to left, the base plate is equipped with a tensioning feeder, a cutting unit, a slitting feeder, a pushing and positioning unit, and a bending unit. Both the frame and the base plate have guide frames at their right ends for guiding the pipe material into the feed. A straightening and rounding device is located to the right of the tensioning feeder and is used to straighten the pipe material. The straightened pipe is tensioned and fed into the cutting unit by the tensioning feeder for cutting. The cutting unit clamps the short pipe being cut and then... The feeding unit clamps and cuts the short pipe that is not completely cut during the downward movement of the splitting feeding unit. The discharge side of the splitting feeding unit corresponds to the feed side of the initial position in the pushing and positioning unit. During the process of the short pipe falling into the pushing and positioning unit and being pushed to the bending unit, the feeding needle in the pushing and positioning unit and the positioning needle in the bending unit extend to the straight section to be formed at both ends of the short pipe to prevent displacement and position it during bending. The rear side of the frame is equipped with a chain plate elevator for conveying the short U-shaped collar sent out by the discharge side of the bending unit to the collar storage station outside the collar unit. The bending unit includes a compensating power drive device and a bending mechanism. The compensating power drive device includes a main power drive unit and a power compensation unit located on both sides of the upper surface of the base plate. The bending mechanism includes a bending clamping die assembly and a bending assembly. Between the main power drive unit and the power compensation unit is the bending clamping die assembly mounted on the base plate and the bending assembly located outside the bending clamping die assembly with both ends rotatably supported on the base plate. The output shaft of the main power drive unit is fixedly connected to one end of the bending shaft in the bending assembly, and the other end of the bending shaft is connected to the power compensation unit. Under the synchronous action of the main power drive unit and the power compensation unit, the bending assembly is driven to flip. The main power drive unit includes a servo motor and a reducer. The reducer is supported on the base plate and fixed to the reducer housing. The output shaft of the servo motor is fixedly connected to the input shaft of the reducer. The output shaft of the reducer is fixedly connected to one end of the bending shaft. The power compensation unit includes a cylinder, a rack, and a gear. The cylinder is located outside the other end of the bending shaft and fixed to the base plate. The end of the cylinder piston rod is fixedly connected to the corresponding end of the rack, which is mounted on the base plate and is perpendicular to the bending shaft space. The gear fixed at the other end of the bending shaft meshes with the rack, and the bending shaft is assisted in its rotation by the cooperation of the rack and gear under the extension and retraction of the cylinder piston rod.

2. The chipless short U-shaped collar automatic forming integrated machine according to claim 1, characterized in that: The tension-type feeding unit includes a feeding drive assembly, a clamping mold assembly one, and a clamping mold assembly two, which are rotatably supported on the feeding side plate at the right end of the base plate. The moving part of the feeding drive assembly is fixedly connected to a moving plate that is guided and installed along the length of the base plate. The clamping mold assembly one, which is used to clamp the pipe, is installed on the moving plate. The feeding drive assembly drives the moving plate and the clamping mold assembly one to reciprocate along the length of the base plate. A fixed frame is provided on the right side of the feeding drive assembly on the right end plate of the base plate. The clamping mold assembly two, which is used to clamp the pipe, is installed on the fixed frame. Stable feeding of the pipe is achieved by the alternating clamping of the clamping mold assembly two and the clamping mold assembly one with a pair of pipes.

3. The chipless short U-shaped collar automatic forming integrated machine according to claim 2, characterized in that: The feed drive assembly includes a motor and a lead screw arranged parallel to the length direction of the base plate. The two ends of the lead screw are rotatably supported on the vertical plate of the base plate through bearing seats, and the nut seat adapted to the lead screw is fixedly connected to the moving plate. Under the drive of the motor, the nut seat drives the moving plate and the clamping mold assembly to reciprocate along the length direction of the base plate. The clamping mold assembly 2 has the same structure as the clamping mold assembly 1. Both are driven by a cylinder to move the movable clamping mold and clamp the pipe located between the movable clamping mold and the fixed clamping mold.

4. The chipless short U-shaped collar automatic forming integrated machine according to claim 1, characterized in that: The cutting and feeding unit includes a lifting plate parallel to the width of the base plate and located on the discharge side of the cutting unit. A first chuck group and a second chuck group, which cooperate with each other, are installed at the bottom of the lifting plate through guide components. Two small cylinders are symmetrically fixed on the upper surface of the lifting plate, and the extension and retraction ends of the two small cylinders are fixedly connected to the first chuck group and the second chuck group through connecting plates that pass through guide holes at corresponding positions on the surface of the lifting plate. When the two small cylinders drive the first chuck group and the second chuck group to move in opposite directions, they clamp or release the short pipe. The two ends of the lifting plate are supported on the base plate by lifting devices. The short pipe that has been cut by the cutting component is clamped and moved downward by the first chuck group and the second chuck group driven by the lifting device, realizing the short pipe displacement, cutting and downward feeding. Limit adjustment devices are installed on the bottom surface of the lifting plate on both sides of the first chuck group and the second chuck group to adjust and limit the outward movement of the first chuck group and the second chuck group.

5. The chipless short U-shaped collar automatic forming integrated machine according to claim 4, characterized in that: The lifting device includes a large air cylinder. The lower end of the air cylinder is fixed to the base plate through a cylinder seat, and the telescopic part of the upper end of the air cylinder is fixedly connected to the corresponding end of the lifting plate. Under the telescopic control of the air cylinder, the lifting plate can be raised and reset or lowered to cut off the feeding. A guide rod located outside the air cylinder and passing through the guide hole on the corresponding end plate surface of the lifting plate is also fixed on the cylinder seat. Both the first and second chuck assemblies include a mounting plate and clamping plates. The mounting plate is fixed to the bottom of the guide rail in the guide assembly, and the upper ends of multiple clamping plates are fixed to the bottom of the mounting plate. The lower ends of the clamping plates in the first and second chuck assemblies have corresponding arc-shaped grooves on their facing sides. The lower ends of the two connecting plates are fixedly connected to the mounting plates in the first and second chuck assemblies, respectively. When the first and second chuck assemblies move towards or away from each other under the drive of two small cylinders, the two clamping plates clamp or release the short pipe located in the arc-shaped groove.

6. The chipless short U-shaped collar automatic forming integrated machine according to claim 1, characterized in that: The feeding and positioning unit includes a feeding plate mounted on a base plate and a receiving plate located to the left of the feeding plate. The feeding plate and the receiving plate are connected as one unit with adjustable spacing via a feeding drive device at the bottom. An adjustment device is installed on the base plate, and the moving part of the adjustment device is fixedly connected to the feeding plate or the receiving plate. Under the drive of the adjustment device, the feeding plate and the receiving plate move to the left synchronously to the feeding position of the bending unit. The upper surface of the receiving plate is provided with multiple receiving grooves along its length for receiving short pipes that are clamped and moved downwards and cut by the first chuck group and the second chuck group in the cutting feeding unit. The feeding plate is also equipped with feeding grooves of the same number and corresponding positions as the receiving grooves. During the process of the feeding needle being moved to the left by the feeding plate driven by the feeding drive device, the left end of the feeding needle is positioned to fit within the straight section to be formed on the right end of the short tube and is pushed into the forming groove in the bending unit. During the bending process, the short tube is positioned against slippage by the feeding needle extending into the straight section on the right end and the positioning needle in the bending unit extending into the straight section on the left end. The feeding plate is equipped with multiple unloading drive devices. The right end of the unloading needle, which is the same number as the receiving groove and is positioned accordingly, is fixedly connected to the unloading drive device at the corresponding position. Under the drive of the unloading drive device, the left-moving unloading needle pushes the bent short U-shaped collar out of the forming groove.

7. The chipless short U-shaped collar automatic forming integrated machine according to claim 6, characterized in that: The pusher drive device includes two symmetrically arranged sensorless cylinders. The left end of the sensorless cylinder is fixedly connected to the bottom of the receiving plate, and the slider of the sensorless cylinder is fixedly connected to the pusher plate. Under the control of the sensorless cylinder, the pusher plate moves toward or away from the receiving plate. The adjustment device includes a sensorless cylinder two fixed on the base plate. The sensorless cylinder two is arranged perpendicular to the length direction of the push plate and the receiving plate. The transition plate, which is fixedly connected to the slider of the sensorless cylinder two, is fixedly connected to the receiving plate or the push plate. Under the control of the sensorless cylinder two, the push plate and the receiving plate move to the left or right synchronously. The unloading drive device includes multiple ultra-thin cylinders and an unloading push plate. Multiple mounting slots are formed on the surface of the push plate, and the ultra-thin cylinders are located in the mounting slots and are fixedly connected to the push plate. The unloading push plate has a T-shaped plate structure, and the lower end of the unloading push plate, which is adapted to the mounting slot guide, is fixedly connected to the piston rod of the ultra-thin cylinder. Two unloading needles are fixed on the upper left side wall of the unloading push plate. When the bent short U-shaped collar is unloaded, the left end of the unloading needle is driven by the ultra-thin cylinder to push the inner ring surface of the short U-shaped collar to the left and push it out of the forming groove.

8. The chipless short U-shaped collar automatic forming integrated machine according to claim 1, characterized in that: The base plate is inclined and supported on the upper left side of the frame, with the left side lower than the right side. The guide frame, fixed to the right side of the base plate, is parallel to the base plate. The guide frame includes a bracket and a long shaft rotatably mounted on the bracket. Support plates are installed on the upper side walls of the bracket through oblong holes and bolts, with adjustable height. The two ends of the long shaft are mounted on the upper part of the support plates. Multiple guide wheels for supporting and guiding the pipe material are rotatably mounted on the long shaft. Guardrails are provided on both long sides of the base plate and the frame, and a double-door guardrail is provided on the left side of the base plate.

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