Aluminum alloy door and window profile self-positioning straightening device and straightening control method

Abstract

The invention discloses an aluminum alloy door and window profile self-positioning straightening device and a corresponding straightening regulation and control method, and relates to the technical field of aluminum alloy door and window profile machining. The device comprises two sets of stretching machine heads which are symmetrically arranged and a positioning and conveying mechanism, particle filling and clamping cavities are formed in the stretching machine heads, the cavities are filled with hard particles, an insertion opening is formed in the side, facing a sectional material, of each cavity, and an external clamping assembly is arranged; the particle filling and clamping cavity is composed of a clamping box and is provided with a hydraulic cylinder, a bearing groove, an adjustable plugging mechanism, a pressure sensor and other components in a matched mode. According to the invention, the end part of the profile is filled and wrapped by the hard particles and compacted to form a rigid inner support, so that the problems of clamping collapse, deformation diffusion and overlong scrapped section of the open profile are thoroughly solved, the device is suitable for door and window profiles of various specifications, the automation degree is high, the profile straightening quality and the production efficiency can be effectively improved, and the production cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of profile processing technology, specifically to a self-positioning and straightening device and straightening control method for aluminum alloy door and window profiles. Background Technology

[0002] In the production and processing of aluminum alloy door and window profiles, the double-end clamping and stretching straightening method is the most widely used and most efficient mainstream straightening method in the industry. By forcefully clamping both ends of the long strip profile to form automatic positioning and applying axial tension, the profile can be quickly straightened and corrected, and it is widely applicable to the processing of door and window profiles of various lengths.

[0003] In particular, the door and window industry currently uses a large number of C-shaped, U-shaped, and mountain-shaped grooved thin-walled aluminum alloy profiles. These profiles have low rigidity and poor extrusion resistance, resulting in technical defects that are difficult to overcome in the traditional end-clamping and stretching straightening process. To ensure reliable transmission of the stretching and straightening force and avoid slippage between the profile and the clamp, the end clamps must apply a sufficiently large clamping force. However, high-strength clamping directly acts on the thin-walled open structure, which can easily lead to the collapse of the groove at the profile end, concavity of the side wall, deformation of the opening, or even flattening of the entire profile.

[0004] Even more critically, this type of clamping damage is not limited to the area directly in contact with the clamp, but extends outward along the length of the profile, causing simultaneous plastic deformation and cross-sectional failure in a large area near the clamping section. This results in a significant increase in the length of the scrapped sections at both ends of the profile, and a substantial reduction in material utilization and production yield.

[0005] In existing technologies, although there are attempts to improve the end deformation problem by increasing the clamping area and adding flexible pads, these methods have obvious limitations: simply optimizing the external clamps cannot provide effective support for the profile from the inside and cannot prevent the deformation from spreading; traditional internal support structures can only be adapted to closed cavity profiles and cannot be universally used for open groove profiles such as doors and windows, making it difficult to meet the batch straightening needs of multiple specifications and types of door and window profiles, and their compatibility is also poor due to their own structural limitations.

[0006] In summary, traditional end-clamping and straightening methods have consistently failed to address core pain points such as easy clamping and collapse of open profiles, excessively long scrap sections due to deformation diffusion, and poor versatility across different groove types. The industry urgently needs a new end-clamping and straightening technology that features adaptive filling, full-area support, and can effectively shorten the scrap length at the end to meet the high-efficiency, high-yield, and high-versatility straightening production requirements of aluminum alloy door and window profiles. Summary of the Invention

[0007] The purpose of this invention is to provide a self-positioning and straightening device for aluminum alloy door and window profiles that features adaptive filling, full-area support, and can effectively shorten the end scrap length.

[0008] To achieve the above-mentioned objectives, the technical solution adopted by the present invention is: an aluminum alloy door and window profile self-positioning and straightening device, comprising two sets of symmetrically arranged stretching heads for clamping both ends of the profile and applying axial tensile force, and a positioning conveying mechanism disposed between the two sets of stretching heads for conveying the profile to the clamping area of ​​the stretching head and forming a positioning.

[0009] The stretching head is equipped with a granule-filled clamping cavity for clamping the end of the profile. The granule-filled clamping cavity is filled with free-flowing hard granules. An insertion port is provided on the side wall of the granule-filled clamping cavity facing the profile, and the granule-filled clamping cavity can be inserted into the end of the profile through the insertion port to fill the cavity of the profile with hard granules and wrap the exterior of the profile. The granule-filled clamping cavity is equipped with an external clamping assembly. The external clamping assembly can apply clamping pressure to the hard granules to compact the hard granules, thereby achieving rigid internal support and wrapping clamping of the end of the profile. After straightening, the clamping pressure applied by the external clamping assembly is released, the hard granules regain their fluidity, and the end of the profile can be pulled out from the granule-filled clamping cavity.

[0010] Preferably, the particle filling clamping cavity is formed by the inner cavity of a square clamping box, the clamping box is installed in the clamping area of ​​the stretching head, and the clamping box is provided with an insertion port on the side facing the end of the profile.

[0011] The clamping box is driven by a hydraulic cylinder fixedly mounted on the stretching head, forming a reciprocating motion in the direction of approaching or away from the end of the profile; the bottom surface of the clamping box is mounted on the clamping area table of the stretching head and forms a sliding fit with the table surface.

[0012] Preferably, the external clamping assembly includes a pressing plate disposed inside the clamping box and slidingly engaging with the clamping box, and a pressure plate disposed on the top of the clamping box. The pressing plate and the pressure plate are connected by a vertical connecting rod passing through the top surface of the clamping box. The pressure plate is driven by a swinging pressure block on the stretching head.

[0013] Preferably, a rectangular support groove is provided on the clamping area platform below the clamping box, and the length extension direction of the support groove is matched with the movement direction of the clamping box; the bottom of the clamping box contacts the support groove through an inverted frustum-shaped support platform; one side of the support groove is connected to the return port located in the middle of one side of the clamping box through a return pipeline, and a flexible lifting auger is provided in the return pipeline.

[0014] Preferably, a baffle plate is provided at the bottom of the extrusion plate opposite to the return port. The baffle plate can block the return port when the extrusion plate is pressed down to prevent hard particles from returning from the return port.

[0015] Preferably, the side wall of the clamping box opposite to the insertion port is further provided with an adjustable blocking mechanism for easily sealing the insertion port according to the cross-sectional shape and size of the profile; the adjustable blocking mechanism includes a mounting plate installed on the side wall of the clamping box above the insertion port, the upper edge of the mounting plate is provided with a first transverse ridge and the lower edge is provided with a second transverse ridge; it also includes a plurality of lifting blocking strips, each lifting blocking strip including a strip body and a screw provided at the upper end of the strip body, the screw and the strip body being connected by a rotary joint; the screw passes through a screw hole on the first transverse ridge, and the strip body passes through an insertion hole on the second transverse ridge; clamping strips are also provided on the side walls of the clamping box on both sides of the mounting plate, the clamping strips are connected to the side walls of the clamping box by bolts, and one end of the clamping strip presses the mounting plate into an embedded groove on the side wall of the clamping box.

[0016] Preferably, side baffles are provided on the left and right sides of the insertion port, and the side baffles are provided with strip-shaped holes. A stud is fixedly provided on the side wall of the clamping box at a position opposite to the strip-shaped hole and is fitted with a nut. The stud passes through the strip-shaped hole, and the side baffles are locked to the side wall of the clamping box by the nut.

[0017] Preferably, the clamping box is provided with a pressure sensor.

[0018] Preferably, the positioning conveying mechanism includes a positioning conveyor belt group, and on both sides of the positioning conveyor belt group are respectively provided a feeding conveyor belt group for conveying profiles to the positioning conveyor belt group and a discharging conveyor belt group for receiving profiles sent by the positioning conveyor belt group.

[0019] The preferred straightening and adjustment method includes the following steps:

[0020] Step 1: Device preprocessing and parameter setting

[0021] Based on the cross-sectional shape, size, and material stiffness of the aluminum alloy door and window profiles to be straightened, complete the device pre-processing and parameter preset;

[0022] Step 2: Profile positioning, conveying, and end embedding

[0023] Start the positioning and conveying mechanism to precisely align the profile to be straightened with the particle-filled clamping cavity of the two sets of stretching heads; the end of the profile is embedded in the hard particles of the particle-filled clamping cavity with the opening facing upwards, and the hard particles fill the cavity of the profile and wrap the outside of the profile.

[0024] Step 3: Compaction of Hard Particles and Adjustment of Rigid Support

[0025] Activate the external clamping assembly and control the downward pressure of the swing block on the stretching head to apply clamping pressure to the hard particles. The hard particles are compacted, achieving rigid internal support and wrap-around clamping of the profile end; achieving undamaged clamping of the profile end and avoiding end collapse and deformation diffusion during subsequent stretching.

[0026] Step 4: Profile tensioning and straightening adjustment

[0027] After the hard particles are compacted, the control system starts two sets of stretching heads and applies axial tensile force to both sides at a preset stretching rate. The tensile force gradually increases to a preset threshold. During this process, the pressure sensor continuously monitors the compaction pressure of the hard particles. If the pressure decreases, the control system automatically controls the swinging pressure block to press down slightly to compensate for the pressure and maintain a stable clamping state. After the stretching head reaches the preset tensile force, it maintains the pressure for a holding time to cause plastic deformation in the bent part of the profile, thereby achieving straightening and correction.

[0028] Step 5: Depressurization, Particle Recovery, and Profile Removal

[0029] After straightening is completed, the control system first controls the stretching head to release the axial tensile force and return it to the initial position; then it controls the swing pressure block to lift up, driving the pressure plate, vertical connecting rod and extrusion plate to reset upward, releasing the clamping pressure on the hard particles, and the hard particles regain their fluidity; the end of the profile is removed from the particle filling clamping cavity; the positioning conveying mechanism is started to transport the straightened profile to the subsequent equipment, completing a single straightening process.

[0030] The beneficial effects of this invention are mainly reflected in:

[0031] 1. Completely solve the problem of clamping collapse of open profiles: By filling the clamping cavity with particles to wrap the end of the profile, the hard particles are compacted to form a rigid internal support throughout the entire area. Combined with the external wrapping clamping, it effectively avoids end collapse, groove flattening and deformation diffusion of thin-walled profiles with C-shaped, U-shaped and mountain-shaped grooves in doors and windows during tensioning and straightening, greatly shortening the end scrap section and improving the material yield.

[0032] 2. High versatility and adaptability to various profile specifications: It can adapt to door and window profiles with different cross-sectional shapes and sizes. When changing profiles, there is no need to modify the overall structure of the device, reducing the cost of changing profiles and meeting the needs of mass production.

[0033] 3. No damage during clamping, ensuring profile quality: Particle filling achieves flexible wrapping and rigid support, avoiding surface indentations and scratches caused by hard contact of traditional clamps. The compaction pressure can be adjusted in real time to prevent pressure overload from damaging the profile, ensuring the appearance and dimensional accuracy of the profile after straightening.

[0034] 4. High degree of automation, improving production efficiency: The positioning and conveying mechanism realizes automatic feeding, positioning and unloading of profiles, and the particle recycling mechanism realizes the recycling of hard particles. With the full-process linkage control, manual intervention is reduced and straightening efficiency is improved.

[0035] 5. Simple and reliable structure with low maintenance cost: It abandons the complex capsule and internal support mechanism and adopts a granular filling structure with adjustable parts, resulting in a low failure rate; the granules can be recycled and reused, reducing the cost of consumables, and the device is easy to maintain. Attached Figure Description

[0036] Figure 1 This is a top view of the overall structure of the present invention;

[0037] Figure 2 This is a schematic diagram of the stretching machine head without the clamping box installed.

[0038] Figure 3 This is a schematic diagram of the mounting structure of the clamping box on the stretching machine head;

[0039] Figure 4 for Figure 3 Enlarged view of section A in the middle;

[0040] Figure 5 for Figure 4 Right view of the clamping box.

[0041] Figure label:

[0042] 1-Stretching head, 2-Positioning conveying mechanism, 3-Particle filling clamping cavity, 4-Hard particles, 5-Insert port, 6-External clamping assembly, 7-Clamping box, 8-Hydraulic cylinder, 9-Clamping area table, 10-Extrusion plate, 11-Pressure plate, 12-Vertical connecting rod, 13-Swinging pressure block, 14-Support groove, 15-Supporting platform, 16-Return pipeline, 17-Return port, 19-Baffle plate, 20-Adjustable blocking mechanism, 21-Mounting plate, 22-First transverse ridge, 23-Second transverse ridge, 24-Lifting sealing strip, 25-Strip body, 26-Screw, 27-Rotary joint, 28-Pressure strip, 29-Bolt, 31-Side baffle, 32-Strip hole, 33-Stud, 34-Nut, 35-Pressure sensor, 36-Positioning conveyor belt group, 37-Feeding conveyor belt group, 38-Discharging conveyor belt group. Detailed Implementation

[0043] The following is in conjunction with the appendix Figure 1-5 The following is a detailed description of specific embodiments of the present invention. These embodiments are only used to explain the present invention and are not intended to limit the scope of protection of the present invention.

[0044] like Figure 1As shown, the present invention discloses a self-positioning and straightening device for aluminum alloy door and window profiles. The core of this device is to solve the straightening problem of thin-walled profiles with openings such as C-shaped, U-shaped, and mountain-shaped grooves in the aluminum alloy door and window industry. It avoids the end collapse caused by traditional clamping methods, especially the problems of deformation diffusion and excessively long scrap sections. At the same time, it realizes universal straightening of profiles of multiple specifications, improving production efficiency and profile quality.

[0045] I. Implementation Details of the Overall Structure of the Device

[0046] This device mainly consists of a stretching head 1, a positioning and conveying mechanism 2, a particle filling and clamping cavity 3, and supporting components. The specific structure is as follows:

[0047] 1. Stretching head 1: Two sets are provided, symmetrically arranged at both ends of the positioning and conveying mechanism 2. Its core function is to clamp both ends of the profile and apply axial tensile force to straighten the profile. The two sets of stretching heads 1 have completely identical structures to ensure the symmetry of clamping and stretching, and to avoid problems such as offset and uneven force during the stretching process of the profile.

[0048] 2. Positioning Conveying Mechanism 2: Located between the two stretching heads 1, it specifically includes a positioning conveyor belt group 36. A feeding conveyor belt group 37 and a discharging conveyor belt group 38 are respectively installed on both sides of the positioning conveyor belt group 36. The feeding conveyor belt group 37 is used to transport the aluminum alloy door and window profiles to be straightened to the positioning conveyor belt group 36. The positioning conveyor belt group 36 uses limiting structures on both sides to center the profiles, ensuring that both ends of the profiles are accurately aligned with the particle-filling clamping cavities 3 of the two stretching heads 1. The discharging conveyor belt group 38 is used to receive the straightened profiles and transport them to subsequent processing steps, realizing automated feeding, positioning, and discharging of the profiles, reducing manual intervention.

[0049] 3. Particle-filled clamping cavity 3: As a core component of this invention, it is disposed within the clamping area of ​​each stretching head 1 to achieve damage-free clamping of the profile end. For example... Figure 3 As shown, in some embodiments, the particle-filled clamping cavity 3 is formed by the inner cavity of a square clamping box 7. The clamping box 7 is provided with an insertion port 5 on the side facing the end of the profile. The size of the insertion port 5 is adapted to the end cross-sectional size of commonly used door and window profiles. It can be flexibly adjusted by subsequent adjustable components to ensure that the end of the profile can be smoothly inserted and wrapped by hard particles 4.

[0050] The clamping box 7 is filled with free-flowing hard particles 4. The hard particles 4 can be made of quartz sand, iron particles, ceramic beads, etc. The particle size is selected according to the size of the profile cavity to ensure that the opening cavity of the profile and the gap between the clamping box 7 and the profile can be fully filled. In this embodiment, quartz sand with a particle size of 0.5-2mm is preferred, which has both fluidity and rigid support capacity after compaction.

[0051] The clamping box 7 is driven by a hydraulic cylinder 8 fixedly mounted on the stretching head 1, and can reciprocate in the direction of approaching or moving away from the end of the profile, so as to achieve precise docking and separation between the clamping box 7 and the end of the profile. The bottom surface of the clamping box 7 is mounted on the clamping area table 9 of the stretching head 1 and forms a sliding fit with the table 9. The sliding fit can adopt a guide structure such as a guide rail slider, which is not shown in the figure, to ensure that the clamping box 7 moves smoothly and without deviation, and to ensure the alignment accuracy between the insertion port 5 and the end of the profile.

[0052] 4. External clamping assembly 6: disposed on the particle-filled clamping cavity 3, used to apply clamping pressure to the hard particles 4 inside the clamping box 7, so that the hard particles 4 are compacted to form a rigid support. Figure 3 , 4 As shown, in some embodiments, the external clamping assembly 6 includes a pressing plate 10, a pressure plate 11, a vertical connecting rod 12, and a swinging pressure block 13. The pressing plate 10 is disposed inside the clamping box 7 and slides vertically against the inner wall of the clamping box 7. The size of the pressing plate 10 matches the cross-sectional size of the inner cavity of the clamping box 7 to ensure that pressure can be applied to the hard particles 4 comprehensively and uniformly. The pressure plate 11 is disposed on the top of the clamping box 7. The pressing plate 10 and the pressure plate 11 are connected by a vertical connecting rod 12 passing through the top surface of the clamping box 7. Two to four vertical connecting rods 12 are provided and evenly distributed on the pressing plate 10 and the pressure plate 11 to ensure uniform force distribution. The pressure plate 11 is driven by the swinging pressure block 13 on the stretching head 1. The swinging pressure block 13 is driven to swing by a cylinder or hydraulic cylinder. By pressing down the pressure plate 11, the pressing plate 10 slides downward, thereby compacting the hard particles 4.

[0053] 5. Particle Recycling Mechanism: To achieve the recycling of hard particles 4 and reduce material waste, a rectangular support groove 14 is provided on the clamping area platform 9 below the clamping box 7. The length extension direction of the support groove 14 is matched with the movement direction of the clamping box 7 to collect the hard particles 4 scattered during clamping. The bottom of the clamping box 7 contacts the support groove 14 through an inverted frustum-shaped support platform 15. The inverted frustum-shaped structure can enhance the stability of the clamping box 7 and facilitate the falling of scattered hard particles 4 into the support groove 14. One side of the support groove 14 is connected to the return port 17 located in the middle of one side of the clamping box 7 through a return pipe 16. A flexible lifting auger (not shown in the figure) is provided in the return pipe 16. The flexible lifting auger can lift the hard particles 4 collected in the support groove 14 and transport them back to the clamping box 7 to achieve the recycling of particles.

[0054] Meanwhile, a baffle plate 19 is provided at the bottom of the extrusion plate 10, opposite to the return port 17. The size of the baffle plate 19 is larger than the size of the return port 17, so that it can completely block the return port 17 when the extrusion plate 10 is pressed down, preventing the hard particles 4 from returning from the return port 17 when being extruded, and ensuring the compaction effect. When the extrusion plate 10 is reset upward, the baffle plate 19 moves upward accordingly, opening the return port 17, so that the recovered hard particles 4 can enter the clamping box 7.

[0055] 6. Adjustable blocking mechanism 20: such as Figure 4 , 5 As shown, the adjustable sealing mechanism 20 is installed on the side wall of the clamping box 7 opposite to the insertion port 5. It is used to simply seal the insertion port 5 according to the cross-sectional shape and size of the profile, preventing hard particles 4 from leaking out from the gaps in the insertion port 5. The adjustable sealing mechanism 20 includes a mounting plate 21, a first transverse ridge 22, a second transverse ridge 23, a lifting sealing strip 24, and a pressing strip 28. The mounting plate 21 is installed on the side wall of the clamping box 7 above the insertion port 5. The upper edge of the mounting plate 21 is provided with the first transverse ridge 22, and the lower edge is provided with the second transverse ridge 23. The first transverse ridge 22 has multiple screw holes, and the second transverse ridge 23 has insertion holes that correspond one-to-one with the screw holes. Multiple lifting sealing strips 24 are provided. Each lifting sealing strip 24 includes a strip body 25 and a screw 26 provided at the upper end of the strip body 25. The screw 26 and the strip body 25 are connected by a rotary joint 27 to ensure that when the screw 26 rotates, the strip body 25 only moves up and down and does not rotate with the screw 26. The screw 26 passes through the screw hole on the first transverse ridge 22, and the strip 25 passes through the insertion hole on the second transverse ridge 23. The height of the strip 25 can be adjusted by rotating the screw 26, thereby adjusting the effective size of the insertion port 5 to adapt to profiles with different cross-sectional dimensions. Clamping strips 28 are provided on the side walls of the clamping boxes 7 on both sides of the mounting plate 21. The clamping strips 28 are connected to the side walls of the clamping boxes 7 by bolts 29, and one end of the clamping strip 28 presses the mounting plate 21 into the recessed groove on the side wall of the clamping box 7 (not shown in the diagram), thus fixing the mounting plate 21 and facilitating its disassembly and adjustment.

[0056] 7. Side baffles 31: These are located on the left and right sides of the insertion port 5 to further limit the profile and prevent hard particles 4 from leaking out from the left and right sides of the insertion port 5. The side baffles 31 have slotted holes 32. Studs 33 are fixedly installed on the side wall of the clamping box 7 at positions opposite to the slotted holes 32, passing through the slotted holes 32. The side baffles 31 are locked to the side wall of the clamping box 7 by nuts 34. By loosening the nuts 34, the position of the side baffles 31 can be adjusted along the slotted holes 32 to accommodate profiles of different widths. After adjustment, tightening the nuts 34 will fix the side baffles 31.

[0057] 8. Pressure sensor 35: It is installed inside the clamping box 7, specifically at the bottom of the extrusion plate 10 or on the inner wall of the clamping box 7. It is used to monitor the compaction pressure of the hard particles 4 in real time and feed the pressure signal back to the control system (not shown in the figure). The control system automatically adjusts the downward pressure of the swing block 13 according to the pressure signal to ensure that the compaction pressure of the hard particles 4 is maintained within the preset threshold range, so as to ensure that sufficient rigid support is formed and to avoid excessive pressure from damaging the profile.

[0058] II. Implementation Steps of the Straightening and Control Method Based on the Above Device

[0059] Based on the above-described device structure, the specific implementation steps of the straightening and control method of the present invention are as follows, achieving fully automated control without extensive manual intervention:

[0060] Step 1: Device preprocessing and parameter setting

[0061] Based on the cross-sectional shape of the aluminum alloy door and window profile to be straightened, such as C-shaped, U-shaped, or mountain-shaped groove, as well as its dimensions and material rigidity, the device pre-treatment is completed: the effective size of the insertion port 5 is adjusted by the lifting and sealing strip 24 of the adjustable blocking mechanism 20, and the rotating screw 26 drives the strip body 25 to rise and fall, so that the insertion port 5 matches the end section of the profile, preventing the hard particles 4 from leaking excessively from the gaps in the insertion port 5. The side baffles 31 on both sides of the insertion port 5 are adjusted, the nuts 34 are loosened, the spacing of the side baffles 31 along the strip hole 32 is adjusted to fit the width of the profile, and then the nuts 34 are tightened to lock and fix it. The control system presets the compaction pressure threshold of the hard particles 4 according to the material rigidity of the profile, for example: 0.5-2MPa, presets the tensile force threshold of the tensile head 1, the tensile rate, usually such as: 5-10mm / s, and the holding time, such as: 3-5s, and presets the start and stop trigger conditions of the flexible lifting auger: it starts after the extrusion plate 10 is reset and stops when the extrusion plate 10 is pressed down.

[0062] Step 2: Profile positioning, conveying, and end embedding

[0063] The positioning conveyor 2 is activated, and the aluminum alloy door and window profile to be straightened is conveyed to the positioning conveyor 36 via the feeding conveyor belt group 37. The positioning conveyor belt group 36 centers the profile, ensuring that both ends of the profile are accurately aligned with the particle filling clamping cavities 3 of the two sets of stretching heads 1. The control system controls the hydraulic cylinder 8 on the stretching head 1 to drive the clamping box 7 to slide along the guide rail slider structure of the clamping area table 9, so that the clamping box 7 is inserted into the outside of the profile end through the insertion port 5, and the profile end is buried in the hard particles 4 of the clamping box 7 with the opening facing upward. The burial depth is 50-100mm to ensure sufficient clamping length and reduce scrap sections. The hard particles 4 automatically fill the opening cavity of the profile and the gap between the clamping box 7 and the profile by their own weight, realizing full coverage and initial filling support of the profile end.

[0064] Step 3: Compaction of Hard Particles and Adjustment of Rigid Support

[0065] The external clamping assembly 6 is activated, and the control system controls the swinging pressure block 13 on the stretching head 1 to swing and press down, driving the pressure plate 11 to move downwards. This, in turn, drives the extrusion plate 10 to slide downwards along the inner wall of the clamping box 7 via the vertical connecting rod 12. During the pressing process of the extrusion plate 10, the baffle plate 19 at its bottom simultaneously blocks the return port 17 of the clamping box 7 to prevent the hard particles 4 from returning out of the return port 17 when being extruded. The extrusion plate 10 continuously applies pressure to the hard particles 4 inside the clamping box 7. The pressure sensor 35 collects the compaction pressure of the hard particles 4 in real time and feeds the pressure signal back to the control system. When the pressure reaches a preset threshold, the control system controls the swinging pressure block 13 to stop pressing down and maintain the current pressure. At this time, the hard particles 4 are compacted and form a rigid support body, providing uniform support to the groove wall from inside the profile and forming a wrap-around clamping on the outside of the profile, achieving undamaged clamping of the profile ends and avoiding end collapse and deformation diffusion during subsequent stretching.

[0066] Step 4: Profile tensioning and straightening adjustment

[0067] After the hard granules 4 are compacted, the control system starts two sets of stretching heads 1, applying axial tensile force to both sides at a preset stretching rate. The tensile force gradually increases to a preset threshold, which is set according to the profile length and stiffness, typically 1-5t. During this process, the pressure sensor 35 continuously monitors the compaction pressure of the hard granules 4. If the pressure decreases, indicating that the hard granules 4 have loosened, the control system automatically controls the swinging pressure block 13 to slightly lower and replenish the pressure, maintaining a rigid support state. After the stretching head 1 reaches the preset tensile force, it maintains the pressure for a holding time, causing plastic deformation in the bent parts of the profile, thus achieving straightening and correction. During the holding period, the positioning conveying mechanism 2 remains stationary to prevent the profile from shifting and ensure straightening accuracy.

[0068] Step 5: Depressurization, Particle Recovery, and Profile Removal

[0069] After straightening, the control system first controls the stretching head 1 to release the axial tensile force and return it to its initial position. Then, it controls the swinging pressure block 13 to swing and lift in the opposite direction, driving the pressure plate 11, vertical connecting rod 12, and extrusion plate 10 to reset upwards (in this case, they are linked by a transmission rod). The baffle plate 19 simultaneously leaves the return port 17, releasing the clamping pressure on the hard particles 4, and the hard particles 4 regain their fluidity. The control system starts the flexible lifting auger to transport the scattered hard particles 4 collected in the support groove 14 to the clamping box 7 through the return pipeline 16, realizing particle recycling and reuse. Finally, the control system controls the hydraulic cylinder 8 to drive the clamping box 7 to slide along the clamping area table 9, away from the end of the profile, releasing the clamping of the profile. The positioning conveying mechanism 2 starts, transporting the straightened profile through the positioning conveyor belt group 36 to the unloading conveyor belt group 38, which then transports it to the subsequent processing equipment, completing a single straightening process.

[0070] Step 6: Cyclic straightening and adjustment

[0071] Repeat steps 2 through 5 to automatically cycle and straighten the next profile to be straightened. If a different specification of profile is used, only the pre-treatment operation in step 1 needs to be repeated, and the size of the insertion port 5, pressure threshold, and tensile parameters need to be adjusted. No changes need to be made to the overall structure of the device, so as to achieve universal straightening control for different opening profiles and adapt to the needs of mass production.

[0072] III. Implementation Results Description

[0073] Using the aforementioned device and control method, straightening tests were conducted on two common aluminum alloy door and window profiles: C-type and U-type. Test results showed that the profile ends exhibited no collapse, only slight indentations, and no deformation diffusion. The length of the scrapped end section was reduced from 200-500mm using traditional clamping methods to less than 100mm, with some sections even achieving zero damage, significantly improving material yield. The device can quickly adapt to profiles of different sizes, reducing changeover time to less than 5 minutes. It boasts a high degree of automation, with single profile straightening time controlled within 5-10 seconds, improving production efficiency. The hard granules achieve a recycling rate of over 98%, significantly reducing consumable costs. The device has a simple structure, low failure rate, and convenient maintenance, meeting the high-efficiency, high-yield, and highly versatile straightening production requirements for aluminum alloy door and window profiles.

[0074] It should be noted that the above are only specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any substitution or modification of the components of the device without departing from the concept of the present invention shall be included in the scope of protection of the present invention.

Claims

1. An aluminum alloy door and window profile self-positioning and straightening device, comprising two sets of symmetrically arranged stretching heads (1) for clamping the two ends of the profile and applying axial tensile force, and a positioning and conveying mechanism (2) disposed between the two sets of stretching heads (1) for conveying the profile to the clamping area of ​​the stretching head (1) and forming a positioning. Its features are: The stretching head (1) is provided with a particle-filled clamping cavity (3) for clamping the end of the profile. The particle-filled clamping cavity (3) is filled with fluid hard particles (4). The particle-filled clamping cavity (3) is provided with an insertion port (5) on the side wall facing the profile. The particle-filled clamping cavity (3) can be inserted into the end of the profile through the insertion port (5) to fill the cavity of the profile with hard particles (4) and wrap the outside of the profile. The particle-filled clamping cavity (3) is provided with an external clamping assembly (6). The external clamping assembly (6) can apply clamping pressure to the hard particles (4) to compact the hard particles (4) and achieve rigid internal support and wrapping clamping of the end of the profile. After straightening is completed, the clamping pressure applied by the external clamping assembly (6) is released, the hard particles (4) regain fluidity, and the end of the profile is pulled out from the particle-filled clamping cavity (3).

2. The self-positioning and straightening device for aluminum alloy door and window profiles according to claim 1, characterized in that: The particle filling clamping cavity (3) is formed by the inner cavity of a square clamping box (7), which is installed in the clamping area of ​​the stretching head (1), and the insertion port (5) is provided on the side of the clamping box (7) facing the end of the profile. The clamping box (7) is driven by a hydraulic cylinder (8) fixedly mounted on the stretching head (1) to form a reciprocating motion in the direction of approaching or away from the end of the profile; the bottom surface of the clamping box (7) is mounted on the clamping area table (9) of the stretching head (1) and forms a sliding fit with the table (9).

3. The self-positioning and straightening device for aluminum alloy door and window profiles according to claim 2, characterized in that: The external clamping assembly (6) includes a pressing plate (10) disposed inside the clamping box (7) and forming an up-and-down sliding fit with the clamping box (7), and a pressure plate (11) disposed on the top of the clamping box (7). The pressing plate (10) and the pressure plate (11) are connected by a vertical connecting rod (12) passing through the top surface of the clamping box (7). The pressure plate (11) is driven by a swinging pressure block (13) on the stretching head (1).

4. The self-positioning and straightening device for aluminum alloy door and window profiles according to claim 2, characterized in that: A rectangular support groove (14) is also provided on the clamping area platform (9) below the clamping box (7). The length extension direction of the support groove (14) is matched with the movement direction of the clamping box (7). The bottom of the clamping box (7) is in contact with the support groove (14) through an inverted frustum-shaped support platform (15). One side of the support groove (14) is connected to the return port (17) located in the middle of one side of the clamping box (7) through a return pipeline (16). A flexible lifting auger is provided in the return pipeline (16).

5. The self-positioning and straightening device for aluminum alloy door and window profiles according to claim 3, characterized in that: A baffle plate (19) is also provided at the bottom of the extrusion plate (10) opposite to the return port (17). The baffle plate (19) can block the return port (17) when the extrusion plate (10) is pressed down, so as to prevent hard particles (4) from returning from the return port (17).

6. The self-positioning and straightening device for aluminum alloy door and window profiles according to claim 2, characterized in that: On the side wall of the clamping box (7) opposite to the insertion port (5), an adjustable blocking mechanism (20) is provided for simple sealing of the insertion port (5) according to the cross-sectional shape and size of the profile; the adjustable blocking mechanism (20) includes a mounting plate (21) installed on the side wall of the clamping box (7) above the insertion port (5), the upper edge of the mounting plate (21) is provided with a first transverse ridge (22) and the lower edge is provided with a second transverse ridge (23); it also includes a plurality of lifting blocking strips (24), the lifting blocking strips (24) include a strip body (25) and a part provided on the strip body (25). 5) The upper screw (26) is connected to the strip (25) by a rotary joint (27); the screw (26) passes through the screw hole on the first transverse ridge (22), and the strip (25) passes through the insertion hole on the second transverse ridge (23); the clamping box (7) on both sides of the mounting plate (21) is also provided with a clamping strip (28), the clamping strip (28) is connected to the side wall of the clamping box (7) by bolts (29), and one end of the clamping strip (28) presses the mounting plate (21) into the embedded groove on the side wall of the clamping box (7).

7. The self-positioning and straightening device for aluminum alloy door and window profiles according to claim 2, characterized in that: Side baffles (31) are provided on the left and right sides of the insertion port (5). A strip hole (32) is provided on the side baffle (31). A stud (33) is fixedly provided on the side wall of the clamping box (7) at the position opposite to the strip hole (32) and is fitted with a nut (34). The stud (33) passes through the strip hole (32), and the side baffle (31) is locked to the side wall of the clamping box (7) by the nut (34).

8. The self-positioning and straightening device for aluminum alloy door and window profiles according to claim 2, characterized in that: The clamping box (7) is equipped with a pressure sensor (35) for monitoring the compaction pressure of hard particles (4).

9. The self-positioning and straightening device for aluminum alloy door and window profiles according to claim 1, characterized in that: The positioning conveying mechanism (2) includes a positioning conveyor belt group (36). On both sides of the positioning conveyor belt group (36), there are a feeding conveyor belt group (37) for conveying profiles to the positioning conveyor belt group (36) and a discharging conveyor belt group (38) for receiving profiles sent by the positioning conveyor belt group (36).

10. A straightening and control method based on the self-positioning and straightening device for aluminum alloy door and window profiles according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Device preprocessing and parameter setting Based on the cross-sectional shape, size, and material stiffness of the aluminum alloy door and window profiles to be straightened, complete the device pre-processing and parameter preset; Step 2: Profile positioning, conveying, and end embedding Start the positioning and conveying mechanism (2) to precisely align the profile to be straightened with the particle filling clamping cavity (3) of the two sets of stretching heads (1); the end of the profile is embedded in the hard particles (4) of the particle filling clamping cavity (3) with the opening facing upward, and the hard particles (4) fill the cavity of the profile and wrap the outside of the profile. Step 3: Compaction of Hard Particles and Adjustment of Rigid Support Start the external clamping assembly (6) and control the swing block (13) on the stretching head (1) to press down and apply clamping pressure to the hard particles (4). The hard particles (4) are compacted to achieve rigid internal support and wrap-around clamping of the profile end; achieve undamaged clamping of the profile end and avoid end collapse and deformation diffusion during subsequent stretching. Step 4: Profile tensioning and straightening adjustment After the hard particles (4) are compacted, the control system starts two sets of stretching heads (1) and applies axial stretching force to both sides according to the preset stretching rate. The stretching force gradually increases to the preset threshold. During this process, the pressure sensor (35) continuously monitors the compaction pressure of the hard particles (4). If the pressure decreases, the control system automatically controls the swing block (13) to press down slightly to compensate for the pressure and maintain a stable clamping state. After the stretching head (1) reaches the preset stretching force, it maintains the pressure holding time so that the bent part of the profile undergoes plastic deformation and straightening is achieved. Step 5: Depressurization, Particle Recovery, and Profile Removal After straightening is completed, the control system first controls the stretching head (1) to release the axial tensile force and return to the initial position; then controls the swing pressure block (13) to lift up, driving the pressure plate (11), vertical connecting rod (12) and extrusion plate (10) to reset upward, releasing the clamping pressure on the hard particles (4), and the hard particles (4) to restore fluidity; the end of the profile is removed from the particle filling clamping cavity (3); the positioning conveying mechanism (2) is started to convey the straightened profile to the subsequent equipment, completing the single straightening process.

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