Stretch bending machine based on stress retention and its application in automobile trim processing

Abstract

The present invention relates to the technical field of non-cutting processing of profiles, and specifically to a stretch-bending machine based on stress retention and its application in the processing of automobile trim strips, wherein the stretch-bending machine based on stress retention includes a box body, and also includes: swing arms, two of which are symmetrically and movably provided on the box body, and the two swing arms can be driven by a hydraulic boosting mechanism arranged in the box body to perform synchronous and non-directional swinging actions; a locking and limiting mechanism, when the swinging actions of the two swing arms are completed, two sets of locking and limiting mechanisms can be triggered and release elastic potential energy to lock the swing arms respectively to keep the profile in a bent shape; after the profile bending process is completed, the locking and limiting mechanism will be triggered and release elastic potential energy to lock the swing arms, and the hydraulic boosting mechanism can release the driving connection state, so that the load of the hydraulic boosting mechanism is released, and the locking and limiting mechanism is used to maintain the bending shape of the profile, so as to avoid the hydraulic boosting mechanism being damaged due to the huge bending load of the profile.

Description

Technical Field

[0001] The invention relates to the technical field of non-cutting processing of profiles, in particular to a stretch bending machine based on stress retention and application thereof in processing of automobile trim strips. Background Art

[0002] Automobile trims are decorative parts used on certain structural parts on the periphery of the automobile body. In the processing of trims, the straight profiles need to be bent to form curved profiles for easy use. This work needs to be completed with the help of a stretch bending machine.

[0003] Generally speaking, when bending profiles, since some profiles have strong hardness, a large driving force is required for bending. The stretch bending machine uses a hydraulic cylinder as the driving source. When the hydraulic cylinder drives the profile to bend to the required angle, the profile needs to maintain stress for a period of time. During this period, the piston rod of the hydraulic cylinder needs to withstand the huge bending load of the profile, which can easily cause the piston rod to get stuck and severely worn, making the maintenance cost of the stretch bending machine higher. Summary of the invention

[0004] The object of the present invention is to provide a stretch bending machine based on stress retention and its application in automobile trim processing to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A stretch bending machine based on stress retention, comprising a box body, further comprising:

[0007] Two swing arms are symmetrically arranged on the box body, and the two swing arms can be driven by a hydraulic booster mechanism arranged in the box body to perform synchronous but non-directional swinging actions;

[0008] An assembly frame is movably arranged on the swing arm and connected to two sets of spacing adjustment mechanisms installed on the swing arm, the spacing adjustment mechanisms can drive the assembly frame to move along the length direction of the swing arm, and a clamping mechanism is provided on the assembly frame, and the clamping mechanism is used to clamp and fix the end of the profile to be processed;

[0009] Two groups of locking and limiting mechanisms are provided in the box body, and elastic potential energy is stored, and they cooperate with the hydraulic boosting mechanism. When the swinging action of the two swing arms is completed, the two groups of locking and limiting mechanisms can trigger and release the elastic potential energy, and lock the swing arms respectively to keep the profile in a bent shape.

[0010] As a further solution of the present invention: the hydraulic boosting mechanism includes a fixed-distance movable component arranged in the box body and a transmission structure connected to the fixed-distance movable component, the transmission structure is located between the rotating axes of the two swing arms, and the fixed-distance movable component can move in a direction perpendicular to the rotating axis of the swing arm, and prompts the transmission structure to drive the swing arm to rotate.

[0011] As a further solution of the present invention: the fixed-distance movable assembly includes a guide rod fixed in the box body, a movable seat slidably arranged on the guide rod, and two first hydraulic cylinders installed in the box body, the two first hydraulic cylinders are respectively located on both sides of the movable seat, and the movable ends are fixed to the sides of the movable seat.

[0012] As a further solution of the present invention: the movable seat is arranged in a "U" shape and has two cavities thereon. The transmission structure includes two vertical arms slidably arranged in the cavities and a horizontal platform fixedly installed on the two vertical arms. A second hydraulic cylinder is also installed on the movable seat. The movable end of the second hydraulic cylinder is fixed to the horizontal platform. A driving member is provided on the horizontal platform, and the driving member cooperates with a gear fixed on the rotating shaft of the swing arm.

[0013] As a further solution of the present invention: the driving member includes a movable plate slidably arranged on the horizontal platform and two tooth plates respectively fixed on both sides of the movable plate, the tooth plates cooperate with the gears, and a third hydraulic cylinder is also installed on the horizontal platform, and the movable end of the third hydraulic cylinder is fixed to the movable plate.

[0014] As a further solution of the present invention: the locking and limiting mechanism comprises a plurality of columns fixedly mounted in the box body and a lifting plate slidably connected to the plurality of columns, the outer circumference of the columns is also sleeved with a cylindrical spring, one end of the cylindrical spring is connected to the bottom wall of the box body, and the other end is connected to the lifting plate;

[0015] Among them, a rolling matching structure is provided between the lifting plate and the movable seat, and one end of the lifting plate extends to the outside of the box body and forms an arc-shaped portion, which is concentric with the rotation axis of the swing arm. A limiting column is detachably connected to the arc-shaped portion, and the limiting column is adapted to a circular hole provided at the bottom of the swing arm.

[0016] As a further solution of the present invention: the rolling matching structure includes a cross arm fixed to the side of the movable seat and a roller installed on the end of the cross arm away from the movable seat, and the roller abuts against a strip protrusion formed on the side of the lifting plate toward the movable seat.

[0017] As a further solution of the present invention: two slide rails are fixedly provided on the swing arm, and a slider is slidably engaged in each of the two slide rails, and the assembly frame is fixed on the two sliders;

[0018] The spacing adjustment mechanism includes a one-way screw rotatably mounted on the swing arm and a drive motor mounted on the swing arm, the one-way screw is connected to the output end of the drive motor, and the one-way screw passes through the slider, and the slider is threadedly connected to the one-way screw.

[0019] As a further solution of the present invention: two guide plates are fixedly provided in the assembly frame, an assembly plate is slidably provided on the two guide plates, the assembly plate is fixed to the movable end of the fourth hydraulic cylinder installed on the assembly frame, and a guide groove is provided on the assembly plate;

[0020] The clamping mechanism includes two clamping members symmetrically slidably embedded in the guide groove, and a bidirectional screw is also rotatably installed on the side of the assembly plate. The bidirectional screw passes through the two clamping members, and the two clamping members are threadedly connected to the bidirectional screw. A plurality of lugs are also provided at one end of the clamping member away from the bidirectional screw, and threaded holes are provided on the lugs.

[0021] The application of the stretch bending machine based on stress retention in the processing of automobile trim strips.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] When the first hydraulic cylinder drives the swing arm to deflect, the roller can limit the lifting plate through the bar protrusion. When the profile is bent to the required angle, the roller is separated from the bar protrusion, and the limit column is driven to lock the swing arm through the rebound of the column spring. The limit column bears the bending load of the profile, which can effectively avoid the problems of piston rod extension and extension jamming and severe wear, and reduce the maintenance cost of the stretch bending machine;

[0024] Secondly, the movable stroke of the first hydraulic cylinder is fixed, and the position of the tooth plate on the horizontal table can be adjusted by the third hydraulic cylinder, so that the effective matching distance between the tooth plate and the gear is variable, and the adjustable function of the profile bending angle is realized, so that the stretch bending machine can be applied to products with different production requirements, and the practicality of the stretch bending machine in actual use is improved;

[0025] In addition, when in use, the spacing adjustment mechanism can drive the assembly frame to move along the length direction of the swing arm, thereby realizing the function of regulating the distance between the two sets of clamping mechanisms, making it convenient to tighten decorative strips of different lengths and meet the production needs of different batches of products. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1The figure is a schematic structural diagram of an embodiment of a stretch bending machine based on stress retention.

[0027] Figure 2 It is a schematic structural diagram of another angle of an embodiment of a stretch bending machine based on stress retention.

[0028] Figure 3 It is a structural schematic diagram of another angle of an embodiment of a stretch bending machine based on stress retention.

[0029] Figure 4 This is a schematic diagram of the internal structure of a box in an embodiment of a stretch bending machine based on stress retention.

[0030] Figure 5 for Figure 4 A magnified view of the structure at center.

[0031] Figure 6 It is a structural explosion diagram of the hydraulic boosting mechanism in an embodiment of a stretch bending machine based on stress retention.

[0032] Figure 7 It is a structural schematic diagram of a hydraulic boosting mechanism in an embodiment of a stretch bending machine based on stress retention.

[0033] Figure 8 The present invention is a schematic structural diagram of a locking and limiting mechanism in an embodiment of a stretch bending machine based on stress retention.

[0034] Fig. 9 The figure is a schematic diagram of the connection relationship between the assembly frame and the swing arm in one embodiment of a stretch bending machine based on stress retention.

[0035] Fig.10 It is a structural explosion diagram of the clamping mechanism in one embodiment of a stretch bending machine based on stress retention.

[0036] In the figure: 1, box body; 2, swing arm; 201, round hole; 3, assembly frame; 4, gear; 5, tooth plate; 6, guide rod; 7, movable seat; 8, vertical arm; 9, horizontal table; 10, movable plate; 11, first hydraulic cylinder; 12, second hydraulic cylinder; 13, third hydraulic cylinder; 14, fourth hydraulic cylinder; 15, guide plate; 16, assembly plate; 1601, guide groove; 17, clamping piece; 18, lug; 1801, threaded hole; 19, two-way screw rod; 20, slider; 21, drive motor; 22, one-way screw rod; 23, slide rail; 24, arc plate; 25, column; 26, columnar spring; 27, lifting plate; 2701, strip protrusion; 28, horizontal arm; 29, roller; 30, limit column. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0039] See also Figure 1-Figure 10 In an embodiment of the present invention, a bending machine based on stress retention includes a box body 1 and further includes:

[0040] Two swing arms 2 are symmetrically arranged on the box body 1, and the two swing arms 2 can be driven by a hydraulic booster mechanism arranged in the box body 1 to perform synchronous but non-directional swinging actions;

[0041] An assembly frame 3 is movably arranged on the swing arm 2 and connected to two sets of spacing adjustment mechanisms installed on the swing arm 2. The spacing adjustment mechanisms can drive the assembly frame 3 to move along the length direction of the swing arm 2. A clamping mechanism is provided on the assembly frame 3, and the clamping mechanism is used to clamp and fix the end of the profile to be processed;

[0042] Two groups of locking and limiting mechanisms are provided in the box body 1, and elastic potential energy is stored, and they cooperate with the hydraulic boosting mechanism. When the swinging action of the two swing arms 2 is completed, the two groups of locking and limiting mechanisms can trigger and release the elastic potential energy, and lock the swing arms 2 respectively to keep the profile in a bent shape.

[0043] Specifically, during operation, the spacing adjustment mechanism is activated according to the length of the profile to be processed, and the spacing adjustment mechanism drives the assembly frame 3 to move along the length direction of the swing arm 2, so that the clamping mechanism can clamp and fix the two ends of the profile;

[0044] After the clamping of the profile is completed, the hydraulic boosting mechanism works to drive the two swing arms 2 to swing synchronously, and the two swing arms 2 swing in opposite directions, so that the profile is bent to a specified angle. After the bending process of the profile is completed, the locking limit mechanism will be triggered and release the elastic potential energy to lock the swing arm 2. Then, the hydraulic boosting mechanism can release the driving connection state, so that the load of the hydraulic boosting mechanism is released, and the locking limit mechanism is used to maintain the bending shape of the profile to prevent the hydraulic boosting mechanism from being damaged due to the huge bending load of the profile.

[0045] Please refer again Figure 6 and Figure 7 The hydraulic boosting mechanism includes a fixed-distance movable component arranged in the box body 1 and a transmission structure connecting the fixed-distance movable component. The transmission structure is located between the rotation axes of the two swing arms 2, and the fixed-distance movable component can move in a direction perpendicular to the rotation axis of the swing arm 2, and prompts the transmission structure to drive the swing arm 2 to rotate.

[0046] The distance movable assembly includes a guide rod 6 fixed in the box body 1, a movable seat 7 slidably arranged on the guide rod 6, and two first hydraulic cylinders 11 installed in the box body 1. The two first hydraulic cylinders 11 are respectively located on both sides of the movable seat 7, and the movable ends are fixed to the side of the movable seat 7. The movable seat 7 is arranged in a "U" shape, and two cavities are arranged on it. The transmission structure includes two vertical arms 8 slidably arranged in the cavities and a horizontal platform 9 fixedly installed on the two vertical arms 8. A second hydraulic cylinder 12 is also installed on the movable seat 7, and the movable end of the second hydraulic cylinder 12 is fixed to the horizontal platform 9. A driving member is arranged on the horizontal platform 9, and the driving member cooperates with the gear 4 fixed on the rotating shaft of the swing arm 2. The driving member includes a movable plate 10 slidably arranged on the horizontal platform 9 and two tooth plates 5 respectively fixed on both sides of the movable plate 10. The tooth plates 5 cooperate with the gear 4. A third hydraulic cylinder 13 is also installed on the horizontal platform 9, and the movable end of the third hydraulic cylinder 13 is fixed to the movable plate 10.

[0047] During operation, the first hydraulic cylinder 11 drives the movable seat 7 to slide on the guide rod 6, and accordingly, the movable seat 7 drives the horizontal platform 9 to move together through the vertical arm 8, so that the toothed plate 5 can move toward the gear 4 and mesh with the gear 4, and then drive the swing arm 2 to swing through the gear 4 to bend the profile;

[0048] After the swinging action of the two swing arms 2 is completed, the locking limit mechanism is triggered to lock the swing arm 2. Subsequently, the second hydraulic cylinder 12 drives the vertical arm 8 to slide downward on the movable seat 7 until the tooth plate 5 is disengaged from the gear 4. Then, the load of the first hydraulic cylinder 11 is eliminated, and the locking limit mechanism is used to maintain the bending shape of the profile to prevent the first hydraulic cylinder 11 from being damaged due to the huge bending load of the profile. Specifically, when the first hydraulic cylinder 11 is subjected to a large load, the extension and retraction of its piston rod will be stuck and severely worn, which will greatly reduce its service life and increase the maintenance cost of the stretch bending machine.

[0049] However, in actual processing, different batches of profiles need different bending angles. In this regard, in the present application, the movable stroke of the first hydraulic cylinder 11 is fixed. When the bending angle needs to be adjusted, the third hydraulic cylinder 13 is started, and the third hydraulic cylinder 13 drives the movable plate 10 to move on the horizontal table 9, thereby changing the initial distance between the tooth plate 5 and the gear 4.

[0050] Furthermore, the larger the initial distance between the tooth plate 5 and the gear 4, under the condition that the movement stroke of the first hydraulic cylinder 11 is fixed, the number of teeth on the tooth plate 5 that can subsequently cooperate with the gear 4 is reduced. Therefore, the angle at which the gear 4 can rotate is reduced, that is, the swing angle of the swing arm 2 is reduced, and the bending angle of the profile is reduced. Conversely, the bending angle of the profile is increased. Therefore, the adjustable function of the bending angle of the profile is realized, so that the stretch bending machine can be suitable for products with different production requirements, thereby improving the practicability of the stretch bending machine in actual use.

[0051] Please refer again Figure 4 and Figure 8 The locking and limiting mechanism includes a plurality of columns 25 fixedly installed in the box body 1 and a lifting plate 27 slidably connected to the plurality of columns 25. The outer periphery of the columns 25 is also sleeved with a cylindrical spring 26. One end of the cylindrical spring 26 is connected to the bottom wall of the box body 1, and the other end is connected to the lifting plate 27.

[0052] Among them, a rolling matching structure is provided between the lifting plate 27 and the movable seat 7, and one end of the lifting plate 27 extends to the outside of the box body 1 and forms an arc-shaped portion, the arc-shaped portion is concentric with the rotation axis of the swing arm 2, and a limit column 30 is detachably connected to the arc-shaped portion, and the limit column 30 is adapted to the circular hole 201 provided at the bottom of the swing arm 2. The rolling matching structure includes a cross arm 28 fixed to the side of the movable seat 7 and a roller 29 installed at one end of the cross arm 28 away from the movable seat 7, and the roller 29 abuts against a strip protrusion 2701 formed on the lifting plate 27 facing the movable seat 7.

[0053] When the first hydraulic cylinder 11 drives the movable seat 7 to slide on the guide rod 6 to drive the swing arm 2 to perform a yaw action through the tooth plate 5 and the gear 4, the roller 29 rolls along the strip protrusion 2701, and the cylindrical spring 26 is in a compressed state. When the movable seat 7 moves to the end of the stroke, that is, the profile has been bent to the required degree, at this time, the roller 29 disengages from the strip protrusion 2701, and the cylindrical spring 26 rebounds, causing the lifting plate 27 to slide upward on the multiple columns 25. Correspondingly, the limit column 30 enters the circular hole 201 to lock the swing arm 2. Subsequently, the second hydraulic cylinder 12 drives the vertical arm 8 to slide downward on the movable seat 7 until the tooth plate 5 disengages from the gear 4. Then, the load of the first hydraulic cylinder 11 is eliminated, and the bending state of the profile is maintained by the limit column 30.

[0054] It should be supplemented that an arc plate 24 is also fixedly mounted on the box body 1, and the arc plate 24 is concentric with the arc portion of the lifting plate 27. When the initial distance between the tooth plate 5 and the gear 4 is adjusted by the third hydraulic cylinder 13, the position of the limit column 30 on the arc portion needs to be changed. At this time, the staff can compare through the angle scale provided on the arc plate 24.

[0055] Please refer again Figure 2 , Figure 5 , Fig. 9 as well as Fig.10 Two slide rails 23 are fixedly provided on the swing arm 2, and a slider 20 is slidably engaged in each of the two slide rails 23, and the assembly frame 3 is fixed on the two sliders 20; the spacing adjustment mechanism includes a one-way screw rod 22 rotatably mounted on the swing arm 2 and a driving motor 21 mounted on the swing arm 2, the one-way screw rod 22 is connected to the output end of the driving motor 21, and the one-way screw rod 22 passes through the slider 20, and the slider 20 is threadedly connected to the one-way screw rod 22.

[0056] When producing different batches of products, the lengths of the profiles may be different. In order to facilitate clamping of the profiles, the drive motor 21 is started, and the drive motor 21 can drive the one-way screw 22 to rotate. The slide rail 23 guides the slider 20, so that the slider 20 and the one-way screw 22 are threadedly matched and slide along the slide rail 23 (i.e., the length direction of the swing arm 2), thereby adjusting the distance between the two sets of clamping mechanisms and meeting the processing requirements for profiles of different lengths.

[0057] Two guide plates 15 are fixedly provided in the assembly frame 3, and an assembly plate 16 is slidably provided on the two guide plates 15. The assembly plate 16 is fixed to the movable end of the fourth hydraulic cylinder 14 installed on the assembly frame 3, and a guide groove 1601 is provided on the assembly plate 16;

[0058] The clamping mechanism includes two clamping members 17 symmetrically slidably engaged in the guide groove 1601, and a bidirectional screw rod 19 is also rotatably installed on the side of the assembly plate 16. The bidirectional screw rod 19 passes through the two clamping members 17, and the two clamping members 17 are threadedly connected to the bidirectional screw rod 19.

[0059] When in use, the end of the profile is placed between the two clamping members 17. At this time, the staff rotates the bidirectional screw rod 19, so that the two clamping members 17 can simultaneously engage with the bidirectional screw rod 19 in threaded engagement and move toward each other, thereby completing the clamping and fixing of the profile.

[0060] Illustratively, in one embodiment, the bidirectional screw rod 19 can also be connected to the output shaft of a servo motor installed on the assembly frame 3, so that the rotation of the bidirectional screw rod 19 is driven by the servo motor. During the specific implementation process, it can be selected according to actual needs, and this embodiment does not make any specific limitations on this.

[0061] It should be further explained that the end of the clamping member 17 away from the bidirectional screw rod 19 is further provided with a plurality of lugs 18, and the lugs 18 are provided with threaded holes 1801. When working, the bidirectional screw rod 19 can pre-clamp the profile, and then the staff can further fasten the profile using fastening components such as bolts through the threaded holes 1801.

[0062] After the bending of the profile is completed, the clamping member 17 releases the fixing state of the profile, and then the fourth hydraulic cylinder 14 works to drive the assembly plate 16 to rise on the two guide plates 15, so that the staff can take down the processed profile.

[0063] As another embodiment of the present invention, the application of the stress-maintaining bending machine in the processing of automobile trim strips is also proposed. When working, the first hydraulic cylinder 11, the second hydraulic cylinder 12, and the third hydraulic cylinder 13 are automatically controlled by programming, that is, the first hydraulic cylinder 11 first drives the movable seat 7 to slide on the guide rod 6, and through the cooperation of the tooth plate 5 and the gear 4, the two swing arms 2 are synchronously but in different directions, and the profile is bent to a desired angle. Then, the roller 29 is separated from the strip protrusion 2701, and under the rebound action of the cylindrical spring 26, the limit column 30 enters the circular hole 201 at the bottom of the swing arm 2, and the limit column 30 bears the bending load of the profile to achieve stress maintenance. Correspondingly, the second hydraulic cylinder 12 works to drive the horizontal table 9 to move downward until the tooth plate 5 is separated from the gear 4. Therefore, the load carried by the first hydraulic cylinder 11 is released, effectively avoiding the problem of telescopic jamming and severe wear of its piston rod, thereby reducing the maintenance cost of the bending machine.

[0064] After the stress of the profile is maintained for a period of time, the clamping mechanism releases the fastening state of the profile, and the fourth hydraulic cylinder 14 works to drive the assembly plate 16 to lift up, so that the staff can remove the profile on the swing arm 2. Subsequently, the second hydraulic cylinder 12 drives the cross table 9 to move up and reset, so that the tooth plate 5 and the gear 4 are restored to the meshing state. After the staff presses down the lifting plate 27, the first hydraulic cylinder 11 starts working again, driving the movable seat 7 to slide in the opposite direction on the guide rod 6 and reset. The tooth plate 5 cooperates with the gear 4 again, causing the two swing arms 2 to reversely swing and reset. After releasing the lifting plate 27, the strip protrusion 2701 resumes the abutment state with the roller 29.

[0065] It will be apparent to those skilled in the art that the 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 the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0066] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A stretch bending machine based on stress retention, comprising a housing (1); It is characterized in that Also includes: Two swing arms (2) are symmetrically arranged on the box body (1), and the two swing arms (2) can be driven by a hydraulic booster mechanism arranged in the box body (1) to perform synchronous but non-directional swinging movements; An assembly frame (3) is movably mounted on the swing arm (2) and connected to two sets of spacing adjustment mechanisms mounted on the swing arm (2), wherein the spacing adjustment mechanisms are capable of driving the assembly frame (3) to move along the length direction of the swing arm (2), and a clamping mechanism is provided on the assembly frame (3), wherein the clamping mechanism is used to clamp and fix the end of the profile to be processed; Two sets of locking and limiting mechanisms are provided in the box (1) and store elastic potential energy, and cooperate with the hydraulic boosting mechanism. When the swinging action of the two swing arms (2) is completed, the two sets of locking and limiting mechanisms can be triggered and release the elastic potential energy to lock the swing arms (2) respectively, so that the profile maintains the bent shape; The locking and limiting mechanism comprises a plurality of columns (25) fixedly mounted in the box body (1) and a lifting plate (27) slidably connected to the plurality of columns (25); a cylindrical spring (26) is sleeved on the outer circumference of the column (25); one end of the cylindrical spring (26) is connected to the bottom wall of the box body (1), and the other end is connected to the lifting plate (27); A rolling matching structure is provided between the lifting plate (27) and the hydraulic boosting mechanism, and one end of the lifting plate (27) extends to the outside of the box body (1) and forms an arc-shaped portion, the arc-shaped portion is concentric with the rotation axis of the swing arm (2), and a limit column (30) is detachably connected to the arc-shaped portion, and the limit column (30) is adapted to a circular hole (201) provided at the bottom of the swing arm (2).

2. The stretch bending machine based on stress retention according to claim 1, characterized in that: The hydraulic boosting mechanism comprises a fixed-distance movable component arranged in the box body (1) and a transmission structure connected to the fixed-distance movable component, the transmission structure is located between the rotation axes of the two swing arms (2), and the fixed-distance movable component can move in a direction perpendicular to the rotation axes of the swing arms (2), and prompts the transmission structure to drive the swing arms (2) to rotate.

3. The stretch bending machine based on stress retention according to claim 2, characterized in that: The distance movable assembly comprises a guide rod (6) fixed in the box (1), a movable seat (7) slidably arranged on the guide rod (6), and two first hydraulic cylinders (11) installed in the box (1), the two first hydraulic cylinders (11) are respectively located on both sides of the movable seat (7), and the movable ends are fixed to the side of the movable seat (7).

4. The stretch bending machine based on stress retention according to claim 3, characterized in that: The movable seat (7) is arranged in a "U" shape and has two cavities thereon. The transmission structure comprises two vertical arms (8) slidably arranged in the cavities and a horizontal platform (9) fixedly mounted on the two vertical arms (8). A second hydraulic cylinder (12) is also mounted on the movable seat (7). The movable end of the second hydraulic cylinder (12) is fixed to the horizontal platform (9). A driving member is provided on the horizontal platform (9). The driving member cooperates with a gear (4) fixed to a rotating shaft of the swing arm (2).

5. The stretch bending machine based on stress retention according to claim 4, characterized in that: The driving member comprises a movable plate (10) slidably arranged on the horizontal platform (9) and two tooth plates (5) respectively fixed on both sides of the movable plate (10), the tooth plates (5) cooperating with the gear (4), and a third hydraulic cylinder (13) is also installed on the horizontal platform (9), and the movable end of the third hydraulic cylinder (13) is fixed to the movable plate (10).

6. The stretch bending machine based on stress retention according to claim 3, characterized in that: The rolling matching structure comprises a cross arm (28) fixed to the side of the movable seat (7) and a roller (29) installed at one end of the cross arm (28) away from the movable seat (7), and the roller (29) abuts against a strip-shaped protrusion (2701) formed on the side of the lifting plate (27) facing the movable seat (7).

7. The stretch bending machine based on stress retention according to claim 1, characterized in that: Two slide rails (23) are fixedly provided on the swing arm (2), and a slider (20) is slidably engaged in each of the two slide rails (23), and the assembly frame (3) is fixed on the two sliders (20); The spacing adjustment mechanism comprises a one-way screw (22) rotatably mounted on the swing arm (2) and a drive motor (21) mounted on the swing arm (2), the one-way screw (22) being connected to an output end of the drive motor (21), and the one-way screw (22) passing through the slider (20), and the slider (20) being threadedly connected to the one-way screw (22).

8. The stretch bending machine based on stress retention according to claim 1, characterized in that: Two guide plates (15) are fixedly provided in the assembly frame (3), an assembly plate (16) is slidably provided on the two guide plates (15), the assembly plate (16) is fixed to the movable end of a fourth hydraulic cylinder (14) installed on the assembly frame (3), and a guide groove (1601) is provided on the assembly plate (16); The clamping mechanism comprises two clamping members (17) symmetrically slidably engaged in the guide groove (1601), and a bidirectional screw rod (19) is rotatably mounted on the side of the assembly plate (16), the bidirectional screw rod (19) passes through the two clamping members (17), the two clamping members (17) are threadedly connected to the bidirectional screw rod (19), and a plurality of lugs (18) are provided at one end of the clamping member (17) away from the bidirectional screw rod (19), and a threaded hole (1801) is provided on the lug (18).

9. Application of the stretch bending machine based on stress retention as described in any one of claims 1 to 8 in the processing of automobile trim strips.

Images