Arc rod of load type passenger car without wrinkle elbow pipe die
By integrating sliding guide, limit adjustment and bending drive mechanism into the mold, the problems of wrinkling and cracking in the bending process of load-bearing arc rods are solved, realizing efficient and precise bending processing, and improving processing quality and production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIAMEN MEICHI AUTO PARTS IND CO LTD
- Filing Date
- 2025-07-21
- Publication Date
- 2026-07-07
AI Technical Summary
In bus manufacturing, load-bearing arc bars are prone to wrinkles or cracks during bending. Traditional molds lack effective deformation constraints and uniform loading mechanisms, resulting in uneven stress distribution, increased friction, and reduced resistance, which affects processing quality and efficiency.
A mold was designed that includes a sliding guide, a driven limit adjustment, an active limit adjustment, and a bending drive mechanism. The PTFE sliding sleeve reduces friction, the cylinder provides adjustable clamping force, the rack and pinion transmission outputs rotational power, the active limit mechanism follows the bending trajectory, and the modular design facilitates mold core replacement.
It achieves efficient, precise, and wrinkle-free bending of heavy-duty bus arc bars, improving processing quality and production efficiency, meeting high standards of load-bearing capacity and appearance requirements, and enhancing the stability and forming accuracy of the bending process.
Smart Images
Figure CN224463485U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pipe bending mold technology, and in particular to a wrinkle-free pipe bending mold for heavy-duty passenger car arc rods. Background Technology
[0002] In the field of bus manufacturing, the precise bending of curved tubes is a crucial process for ensuring the structural strength and aesthetics of the vehicle body. However, load-bearing curved tubes are typically made of metal materials with specific strengths and wall thicknesses. During bending, the inner side of the tube is subjected to compressive stress, while the outer side is subjected to tensile stress. When the bending radius is small, the inner compression can easily lead to material instability and wrinkle formation; the outer tension may exceed the material's limits, causing cracking. Secondly, traditional tube bending dies often lack effective constraints on tube deformation and uniform loading mechanisms. For example, simple clamping and bending cannot dynamically adjust the support force, resulting in uneven stress distribution and exacerbating the risk of deformation. Furthermore, friction during the bending process is also a factor; improper contact surfaces increase resistance and may induce or aggravate local deformation. Therefore, a wrinkle-free tube bending die for load-bearing bus curved tubes is needed. Utility Model Content
[0003] Based on existing technical problems, this utility model proposes a wrinkle-free bending mold for the arc rod of a heavy-duty passenger vehicle.
[0004] This utility model proposes a wrinkle-free bending mold for a heavy-duty passenger vehicle arc rod, including a base frame. A sliding guide mechanism is provided at one top end of the base frame, and a driven limit adjustment mechanism and an active limit adjustment mechanism are respectively provided at the other top end of the base frame. A bending drive mechanism is provided inside the base frame.
[0005] The sliding guide mechanism enables the sliding guide action during the bending operation of the bus's arc rod.
[0006] The driven limit adjustment mechanism realizes the limit clamping action during the bending of the bus arc rod.
[0007] The active limit adjustment mechanism enables the bus to follow the bending trajectory and limit its movement during the arc bending process.
[0008] The bending drive mechanism enables the bus's arc rod to rotate and bend.
[0009] Preferably, the sliding guide mechanism includes a sliding mounting base, two sliding mounting bases are respectively installed at the top ends of the bottom frame, and a sliding guide rod is installed on the opposite surface of the two sliding mounting bases. A sliding sleeve is slidably installed on the arc surface of the sliding guide rod through a set screw, and a limit slide plate is fixedly installed on the arc surface of the sliding sleeve.
[0010] A first slide rail is fixedly installed at the top end of the bottom frame. A first slider is slidably inserted into the surface of the first slide rail. A sliding stand is fixedly installed on the surface of the first slider. Sliding sleeves are fixedly installed on the surface of the sliding stand and the surface of the limiting slide plate. The sliding sleeves are made of polytetrafluoroethylene. The surface of the bus arc rod slides on the inner wall of the two sliding sleeves.
[0011] Preferably, the driven limit adjustment mechanism includes a first cylinder seat, which is installed on the top of the base frame. A first telescopic cylinder is fixedly installed on one side surface of the first cylinder seat. Two second slide rails are also respectively provided on one side of the first cylinder seat. Both second slide rails are installed on the top of the base frame and are arranged in parallel. A second slider is slidably inserted into the surface of the second slide rail. A driven limit seat is fixedly installed on the top of each of the two second sliders. One side surface of the driven limit seat is fixedly installed with the telescopic end of the first telescopic cylinder. A transverse slider is fixedly installed on the other side surface of the driven limit seat. A transverse slide rail is slidably inserted into the surface of each of the two transverse sliders. A driven limit compression rod is slidably inserted into the surface of the transverse slide rail. The driven limit compression rod is locked onto the surface of the transverse slide rail by screws. One side surface of the driven limit compression rod is in contact with the surface of the bus arc rod.
[0012] Preferably, the bending drive mechanism includes a U-shaped seat and an adapter seat. One side of the U-shaped seat is installed on the inner wall of the bottom frame, and a second telescopic cylinder is fixedly installed on the other side of the U-shaped seat. The telescopic end of the second telescopic cylinder passes through and extends to the inner wall of the U-shaped seat, and a rack is fixedly installed on the telescopic end of the second telescopic cylinder. One end of the rack passes through and extends to the outside of the bottom frame.
[0013] Preferably, a connecting slide is fixedly installed on the outer surface of the bottom frame, and a rotating shaft is rotatably connected to the inner top wall and inner bottom wall of one end of the connecting slide via bearings. Rollers are fixedly installed on the arc surface of the rotating shaft, and the arc surfaces of the two rollers are slidably inserted into one side surface of the rack.
[0014] Preferably, the top and bottom ends of the adapter are rotatably connected to a bending shaft via bearings. A gear is fixedly installed at the bottom end of the bending shaft, and the gear teeth mesh with the tooth groove of the rack. A bending drive plate is limited and engaged at the top end of the bending shaft. A bending die core is provided between the two bending drive plates. A die core groove is formed on the surface of the bending die core, and the die core groove is in extrusion contact with the surface of the bus arc rod. A locking nut is threaded to the top end of the bending shaft, and the locking nut is located at the top of the bending drive plate.
[0015] Preferably, the active limit adjustment mechanism includes an L-shaped mounting plate, which is installed at the bottom of the lower bending drive plate. A limit plate is fixedly installed at one end of the L-shaped mounting plate, and the inner wall of the slot of the limit plate engages with one end of the bus arc rod. Connecting seats are fixedly installed on the opposite surfaces of the other ends of the two bending drive plates. A third telescopic cylinder is fixedly installed at one end of the connecting seat. The telescopic end of the third telescopic cylinder passes through and extends to one side of the connecting seat and is located between the two bending drive plates. An active pressing rod is fixedly installed at the telescopic end of the third telescopic cylinder, and one end of the active pressing rod makes pressing contact with the surface of the bus arc rod.
[0016] The beneficial effects of this utility model are as follows:
[0017] This mold design ingeniously integrates multiple precision mechanisms, enabling efficient, precise, and wrinkle-free bending of heavy-duty bus arc rods. The sliding guide mechanism, utilizing a PTFE sliding sleeve, ensures smooth and precise guidance of the bus arc rod before entering the bending zone, effectively protecting the rod surface and reducing frictional resistance. The driven limit mechanism provides active and adjustable clamping force via a cylinder, combined with slide rail guidance and fine-tuning functions, achieving reliable initial positioning and process limiting. The bending drive mechanism employs rack and pinion transmission, combined with auxiliary support for the rack, to output powerful and stable rotational force, precisely controlling the bending angle. The active limit mechanism innovatively follows the bending trajectory, dynamically adjusting the limit clamping, working in synergy with the driven limit to greatly enhance the stability of the bending process and the forming accuracy. Furthermore, the modular design, such as the quick replacement of the mold core, improves production flexibility. Overall, this mold significantly improves the processing quality, production efficiency, and mold adaptability of bus arc rod bending parts, meeting high standards of load-bearing and appearance requirements, and possesses significant technical advantages and economic benefits. Attached Figure Description
[0018] Figure 1 A schematic diagram of a wrinkle-free bending mold for a heavy-duty passenger vehicle arc rod.
[0019] Figure 2 A three-dimensional view of the bottom frame structure of a non-wrinkled bending pipe mold for a heavy-duty passenger vehicle arc rod;
[0020] Figure 3 A three-dimensional view of the connecting slide structure of a non-wrinkled bending pipe mold for a heavy-duty passenger vehicle arc rod.
[0021] Figure 4 A perspective view of a sliding guide mechanism for a non-wrinkled bending die for a heavy-duty passenger vehicle arc rod;
[0022] Figure 5 A three-dimensional view of the driven limit adjustment mechanism of a non-wrinkled bending pipe mold for a heavy-duty passenger car arc rod;
[0023] Figure 6 A three-dimensional view of an active limit adjustment mechanism for a non-wrinkled bending die for a heavy-duty passenger vehicle arc rod;
[0024] Figure 7 A three-dimensional view of the bending drive mechanism of a non-wrinkled bending die for a heavy-duty passenger vehicle arc rod;
[0025] Figure 8 This is a three-dimensional diagram of the bending core structure of a non-wrinkled bending die for a heavy-duty passenger vehicle arc rod.
[0026] In the diagram: 1. Base frame; 2. Sliding guide mechanism; 21. Sliding mounting seat; 22. Sliding guide rod; 23. Sliding sleeve; 24. Limiting slide plate; 25. First slide rail; 26. First slider; 27. Sliding stand; 28. Sliding sleeve; 3. Driven limit adjustment mechanism; 31. First cylinder seat; 32. First telescopic cylinder; 33. Second slide rail; 34. Second slider; 35. Driven limit seat; 36. Transverse slider; 37. Transverse slide rail; 38. Driven limit pressing rod; 4. Active limit adjustment mechanism; 41. L-shaped mounting plate; 42. Limiting plate; 43. Connecting seat; 44. Third telescopic cylinder; 45. Active extrusion rod; 5. Bending drive mechanism; 51. U-shaped seat; 52. Adapter seat; 53. Second telescopic cylinder; 54. Rack; 55. Connecting slide; 56. Rotating shaft; 57. Rotating roller; 58. Bending shaft; 59. Gear; 510. Bending drive plate; 511. Bending die core; 512. Die core groove; 513. Locking nut. Detailed Implementation
[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0028] Reference Figures 1-8 A heavy-duty passenger vehicle arc rod wrinkle-free bending mold includes a base frame 1, a sliding guide mechanism 2 is provided at one top end of the base frame 1, a driven limit adjustment mechanism 3 and an active limit adjustment mechanism 4 are respectively provided at the other top end of the base frame 1, and a bending drive mechanism 5 is provided inside the base frame 1.
[0029] The sliding guide mechanism 2 realizes the sliding guide action during the bending operation of the bus arc rod. The sliding guide mechanism 2 includes a sliding mounting seat 21, with two sliding mounting seats 21 respectively installed at the top ends of the bottom frame 1. Sliding guide rods 22 are installed on the opposite surfaces of the two sliding mounting seats 21. Sliding sleeves 23 are slidably installed on the arc surface of the sliding guide rods 22 through set screws. Limiting slide plates 24 are fixedly installed on the arc surface of the sliding sleeves 23. A first slide rail 25 is also fixedly installed at one top end of the bottom frame 1. A first slider 26 is slidably inserted into the surface of the first slide rail 25. A sliding stand 27 is fixedly installed on the surface of the first slider 26. Sliding sleeves 28 are fixedly installed on the surface of the sliding stand 27 and the surface of the limiting slide plate 24. The sliding sleeves 28 are made of polytetrafluoroethylene. The surface of the bus arc rod slides on the inner walls of the two sliding sleeves 28.
[0030] Specifically, the sleeve is installed on the arc surface of the sliding guide rod 22 via a set screw. This means that the position of the sleeve 23 on the guide rod can be adjusted by rotating the set screw. PTFE has excellent self-lubricating properties, greatly reducing the friction between the surface of the bus arc rod and the limiting slide plate 24. This makes the bus arc rod slide more smoothly, reducing resistance caused by friction and lowering energy consumption. PTFE material is soft and does not easily scratch metal surfaces. When the bus arc rod contacts and slides with the sleeve 28, it effectively avoids or reduces scratches, indentations, or wear on the surface of the bus arc rod, maintaining the surface quality of the bus arc rod.
[0031] The entire sliding guide mechanism 2 ensures that the bus arc rod can smoothly and accurately transition from a straight state to the area about to enter the bending drive mechanism 5. This avoids impacts or deformations caused by inaccurate positioning or poor guidance before entering the bending zone, creating favorable conditions for subsequent wrinkle-free bending; it improves initial positioning accuracy, enhances operational stability, protects the surface of the bus arc rod from damage, adapts to the needs of different specifications of bus arc rods, and lays the foundation for achieving high-quality wrinkle-free bending.
[0032] The driven limit adjustment mechanism 3 realizes the limit clamping action during the bending of the bus arc rod; the driven limit adjustment mechanism 3 includes a first cylinder seat 31, which is installed on the top of the base frame 1. A first telescopic cylinder 32 is fixedly installed on one side surface of the first cylinder seat 31. Two second slide rails 33 are also respectively provided on one side of the first cylinder seat 31. The two second slide rails 33 are both installed on the top of the base frame 1 and are arranged in parallel. Second sliders 34 are slidably inserted into the surface of the second slide rails 33. A driven limit seat 35 is fixedly installed on the top of each of the four components. One side surface of the driven limit seat 35 is fixedly installed with the telescopic end of the first telescopic cylinder 32. A transverse slider 36 is fixedly installed on the other side surface of the driven limit seat 35. A transverse slide rail 37 is slidably inserted into the surface of each of the two transverse sliders 36. A driven limit pressing rod 38 is slidably inserted into the surface of the transverse slide rail 37. The driven limit pressing rod 38 is locked onto the surface of the transverse slide rail 37 by screws. One side surface of the driven limit pressing rod 38 is in contact with the surface of the bus arc rod.
[0033] Specifically, this is achieved by actively pushing the driven limit seat 35 and its components through the extension and retraction of the cylinder, applying a clamping force to the bus arc rod. Compared to a completely passive limit, the active clamping force provided by the cylinder is stronger and more reliable. The air pressure of the cylinder can be adjusted according to the material, diameter, and bending force of the bus arc rod, thereby precisely controlling the magnitude of the clamping force to ensure that the bus arc rod is firmly fixed without being damaged or deformed due to excessive clamping force. When the driven limit seat 35 is pushed by the cylinder, it moves smoothly along the second slide rail 33, ensuring the linearity and accuracy of the limit action.
[0034] A transverse slider 36 is mounted on the driven limit seat 35, which can slide on the transverse slide rail 37. The driven limit clamping rod 38 can also slide on the transverse slide rail 37 and is locked with screws; this design allows for fine-tuning of the limit point laterally, in addition to the main axial clamping force. This is especially important for arc rods of different shapes, ensuring that the limit clamping rod can press accurately and stably against the side surface of the bus arc rod, achieving multi-point or more uniform limiting. The screw locking ensures that the adjusted position is reliably fixed.
[0035] The bending drive mechanism 5 realizes the action of rotating and bending the arc rod of the bus; the bending drive mechanism 5 includes a U-shaped seat 51 and an adapter seat 52. One side of the U-shaped seat 51 is installed on the inner wall of the bottom frame 1, and a second telescopic cylinder 53 is fixedly installed on the other side of the U-shaped seat 51. The telescopic end of the second telescopic cylinder 53 passes through and extends to the inner wall of the U-shaped seat 51, and a rack 54 is fixedly installed on the telescopic end of the second telescopic cylinder 53. One end of the rack 54 passes through and extends to the outside of the bottom frame 1.
[0036] Specifically, the rack and pinion 54-gear 59 transmission system efficiently and stably converts the linear power of the cylinder into rotational power, providing a large driving force suitable for the bending requirements of heavy-duty bus booms. By controlling the cylinder's extension and retraction speed and stroke, the bending speed and angle can be precisely controlled. The rack and pinion 54-gear 59 transmission system achieves high torque rotational output within a relatively compact space, exhibiting high power transmission efficiency and a relatively simple and reliable structure.
[0037] A connecting slide 55 is fixedly installed on the outer surface of the base frame 1. The inner top wall and inner bottom wall of one end of the connecting slide 55 are rotatably connected to a rotating shaft 56 through bearings. A rotating roller 57 is fixedly installed on the arc surface of the rotating shaft 56. The arc surfaces of the two rotating rollers 57 are slidably inserted into one side surface of the rack 54.
[0038] Specifically, this is implemented such that while rack 54 bears the push / pull force from the cylinder, it also bears the lateral reaction force from roller 57. This is equivalent to adding a support point under rack 54, distributing part of the load, and in particular, reducing the bending or vibration that rack 54 may experience during movement. This is especially important for heavy-duty applications, as rack 54 itself may be relatively long or heavy. The combined design of connecting slide 55, shaft 56, and roller 57 primarily improves the stability, smoothness, and accuracy of the linear motion of rack 54 by providing lateral support and guidance. It reduces the load on rack 54, helps prevent deformation or vibration during movement, and ensures the stability of the implicit meshing between rack 54 and gear 59, thereby indirectly guaranteeing the precise control and quality of the bus arc rod bending angle. In addition, it may also help reduce operating noise and vibration and optimize the overall structural layout of the mold.
[0039] The top and bottom of the adapter 52 are rotatably connected to a bending shaft 58 via bearings. A gear 59 is fixedly installed at the bottom of the bending shaft 58. The teeth of the gear 59 mesh with the tooth groove of the rack 54. A bending drive plate 510 is limited and snapped onto the top of the bending shaft 58. A bending die core 511 is provided between the two bending drive plates 510. A die core groove 512 is opened on the surface of the bending die core 511. The die core groove 512 is in extrusion contact with the surface of the bus arc rod. A locking nut 513 is threadedly connected to the top of the bending shaft 58. The locking nut 513 is located on the top of the bending drive plate 510.
[0040] Specifically, the bending shaft 58 can rotate flexibly via bearings, and its bottom gear 59 meshes with the rack 54. When the rack 54 moves linearly under the drive of the cylinder, it drives the gear 59 to rotate, thereby driving the bending shaft 58 to rotate. The bending drive plate 510 at the top of the bending shaft 58 is locked in place, ensuring the stability of the drive plate when the bending shaft 58 rotates. The bending die 511 set between the two drive plates has a die groove 512 on its surface that contacts and applies pressure to the bus arc rod. The die provides support for the inner side of the bus arc rod during bending, preventing excessive deformation or wrinkling of the bus arc rod during bending. The shape of the die groove 512 can be designed to match the final bending curvature, guiding the bus arc rod to bend along a predetermined trajectory.
[0041] When installing or replacing bending die cores 511 of different specifications, adjustments can be made by loosening the locking nut 513. After adjustment, tightening the locking nut 513 will securely fix the bending drive plate 510 and the die core, ensuring that they will not loosen or shift during high-speed or heavy bending.
[0042] The active limit adjustment mechanism 4 realizes the action of limiting the movement of the bus arc rod during bending. The active limit adjustment mechanism 4 includes an L-shaped mounting plate 41, which is installed at the bottom of the lower bending drive plate 510. A limit plate 42 is fixedly installed at one end of the L-shaped mounting plate 41. The inner wall of the slot of the limit plate 42 is engaged with one end of the bus arc rod. A connecting seat 43 is fixedly installed on the opposite surface of the other end of the two bending drive plates 510. A third telescopic cylinder 44 is fixedly installed at one end of the connecting seat 43. The telescopic end of the third telescopic cylinder 44 passes through and extends to one side of the connecting seat 43 and is located between the two bending drive plates 510. An active pressing rod 45 is fixedly installed at the telescopic end of the third telescopic cylinder 44. One end of the active pressing rod 45 is in contact with the surface of the bus arc rod.
[0043] Specifically, this is implemented by having the limiting mechanism actively follow the bending trajectory of the bus's arc rod. Regardless of changes in the bending angle or radius, the limiting plate 42 remains approximately near the starting end of the bus's arc rod; one provides dynamic following limiting at the starting end, while the other provides fixed or semi-fixed limiting at the middle or other end of the arc rod. This "one static, one dynamic" or "two dynamic" limiting method more effectively constrains the degrees of freedom of the bus's arc rod during bending, preventing unnecessary displacement or twisting.
[0044] The active limit adjustment mechanism 4 mounts the L-shaped mounting plate 41 and the limit clamping plate 42 onto the rotating bending drive plate 510. Combined with the third telescopic cylinder 44 and the active compression rod 45, which can actively control the clamping force, it achieves the function of dynamically following the trajectory of the bus's arc rod during bending and providing precise clamping. Its main advantages and effects are: improved stability during the bending process, enhanced bending accuracy, adaptation to the needs of complex bending paths, and the ability to dynamically adjust the clamping force as needed to protect the bus's arc rod.
[0045] This mold design ingeniously integrates multiple precision mechanisms, enabling efficient, precise, and wrinkle-free bending of heavy-duty bus arc rods. The sliding guide mechanism 2, utilizing a PTFE sliding sleeve 28, ensures smooth and precise guidance of the bus arc rod before entering the bending zone, effectively protecting the arc rod surface and reducing frictional resistance. The driven limit mechanism provides active and adjustable clamping force via a cylinder, combined with slide rail guidance and fine-tuning functions, achieving reliable initial positioning and process limiting. The bending drive mechanism 5 employs a rack and pinion 54-gear 59 transmission, combined with auxiliary support for the rack 54, outputting powerful and stable rotational force and precisely controlling the bending angle. The active limit mechanism innovatively follows the bending trajectory, dynamically adjusting the limit clamping, and works in conjunction with the driven limit mechanism to greatly enhance the stability of the bending process and the forming accuracy. Furthermore, the modular design, such as the quick replacement of the mold core, improves production flexibility. Overall, this mold significantly improves the processing quality, production efficiency, and mold adaptability of bus arc rod bending parts, meeting high standards of load-bearing and appearance requirements, and has significant technical advantages and economic benefits.
[0046] Working Principle: Initial Positioning and Clamping: First, the bus arc rod to be bent is placed in the starting position of the mold. One end of the bus arc rod is fed into the clamping area of the driven limit adjustment mechanism 3, and pressure is applied by its cylinder to reliably fix the bus arc rod. At the same time, the limit slide plate 24 on the sliding guide mechanism 2, with a PTFE sliding sleeve 28, approaches the bus arc rod to provide initial guidance and support, ensuring that the bus arc rod is accurately positioned before bending begins.
[0047] Driven bending: After the bus arc rod is initially fixed, the bending drive mechanism 5 inside the bottom frame 1 begins to operate. The core of this mechanism is the rack and pinion 54-gear 59 transmission system. Typically, one or more gears 59 are connected to components such as the mold core or the drive plate that directly contacts the bus arc rod, or the gear 59 drives a rack 54. When the rack 54 moves linearly under the drive of the cylinder, it drives the gear 59 to rotate, which in turn drives the bending shaft 58 to rotate.
[0048] The third telescopic cylinder 44 is responsible for pressing the bus arc rod tightly against the rotating bending die core 511. When the bending drive plate 510 rotates under the drive of the rack 54-gear 59 system, it will force the bus arc rod that it is pressing to rotate together, thereby achieving bending.
[0049] Bending and releasing: When the rack 54-gear 59 system rotates the bus arc rod to the set bending angle, the drive mechanism stops. Subsequently, the cylinders of the driven limit mechanism and the active limit mechanism release the clamping of the bus arc rod. The bending drive plate 510 may return to its original position, or the overall mold structure may move, causing the bent bus arc rod to disengage from the mold.
[0050] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A wrinkle-free bending mold for a heavy-duty passenger vehicle arc rod, comprising a base frame (1), characterized in that: The bottom frame (1) is provided with a sliding guide mechanism (2) at one end of the top, and a driven limit adjustment mechanism (3) and an active limit adjustment mechanism (4) are provided at the other end of the top of the bottom frame (1). The bottom frame (1) is provided with a bending drive mechanism (5). The sliding guide mechanism (2) realizes the sliding guide action in the bending operation of the bus arc bar; The driven limit adjustment mechanism (3) realizes the limit clamping action during the bending of the bus arc rod; The active limit adjustment mechanism (4) realizes the action of limiting the movement of the bus arc rod during bending, following the bending trajectory; The bending drive mechanism (5) realizes the action of rotating and bending the arc rod of the bus.
2. The wrinkle-free bending mold for a heavy-duty passenger vehicle arc rod according to claim 1, characterized in that: The sliding guide mechanism (2) includes a sliding mounting base (21), two sliding mounting bases (21) are respectively installed at the top ends of the bottom frame (1), and sliding guide rods (22) are installed on the opposite surfaces of the two sliding mounting bases (21). A sliding sleeve (23) is slidably installed on the arc surface of the sliding guide rod (22) through a set screw, and a limit slide plate (24) is fixedly installed on the arc surface of the sliding sleeve (23). The top end of the bottom frame (1) is also fixedly installed with a first slide rail (25). A first slider (26) is slidably inserted into the surface of the first slide rail (25). A sliding stand (27) is fixedly installed on the surface of the first slider (26). Sliding sleeves (28) are fixedly installed on the surface of the sliding stand (27) and the surface of the limiting slide plate (24). The material of the sliding sleeves (28) is polytetrafluoroethylene. The surface of the bus arc rod slides on the inner wall of the two sliding sleeves (28).
3. The wrinkle-free bending mold for a heavy-duty passenger vehicle arc rod according to claim 1, characterized in that: The driven limit adjustment mechanism (3) includes a first cylinder seat (31), which is installed on the top of the bottom frame (1). A first telescopic cylinder (32) is fixedly installed on one side surface of the first cylinder seat (31). Two second slide rails (33) are also respectively provided on one side of the first cylinder seat (31). The two second slide rails (33) are both installed on the top of the bottom frame (1) and are arranged in parallel. A second slider (34) is slidably inserted into the surface of the second slide rail (33). The tops of the two second sliders (34) are fixedly installed. There is a driven limit seat (35), one side surface of the driven limit seat (35) is fixedly installed with the telescopic end of the first telescopic cylinder (32), and a transverse slider (36) is fixedly installed on the other side surface of the driven limit seat (35). A transverse slide rail (37) is slidably inserted on the surface of each of the two transverse sliders (36). A driven limit pressing rod (38) is slidably inserted on the surface of the transverse slide rail (37). The driven limit pressing rod (38) is locked on the surface of the transverse slide rail (37) by screws. One side surface of the driven limit pressing rod (38) is in contact with the surface of the bus arc rod.
4. The wrinkle-free bending mold for a heavy-duty passenger vehicle arc rod according to claim 1, characterized in that: The bending drive mechanism (5) includes a U-shaped seat (51) and an adapter seat (52). One side of the U-shaped seat (51) is installed on the inner wall of the bottom frame (1), and a second telescopic cylinder (53) is fixedly installed on the other side of the U-shaped seat (51). The telescopic end of the second telescopic cylinder (53) passes through and extends to the inner wall of the U-shaped seat (51), and a rack (54) is fixedly installed on the telescopic end of the second telescopic cylinder (53). One end of the rack (54) passes through and extends to the outside of the bottom frame (1).
5. A wrinkle-free bending mold for a heavy-duty passenger vehicle arc rod according to claim 4, characterized in that: A connecting slide (55) is fixedly installed on the outer surface of the bottom frame (1). The inner top wall and inner bottom wall of one end of the connecting slide (55) are rotatably connected to a rotating shaft (56) through a bearing. A rotating roller (57) is fixedly installed on the arc surface of the rotating shaft (56). The arc surfaces of the two rotating rollers (57) are slidably inserted into one side surface of the rack (54).
6. The wrinkle-free bending mold for a heavy-duty passenger vehicle arc rod according to claim 4, characterized in that: The top and bottom ends of the adapter (52) are rotatably connected to a bending shaft (58) via bearings. A gear (59) is fixedly installed at the bottom end of the bending shaft (58). The teeth of the gear (59) mesh with the tooth groove of the rack (54). A bending drive plate (510) is limited and snapped onto the top end of the bending shaft (58). A bending die core (511) is provided between the two bending drive plates (510). A die core groove (512) is opened on the surface of the bending die core (511). The die core groove (512) is in contact with the surface of the bus arc rod. A locking nut (513) is threadedly connected to the top end of the bending shaft (58). The locking nut (513) is located on the top of the bending drive plate (510).
7. A wrinkle-free bending mold for a heavy-duty passenger vehicle arc rod according to claim 6, characterized in that: The active limit adjustment mechanism (4) includes an L-shaped mounting plate (41), which is installed at the bottom of the lower bending drive plate (510). A limit plate (42) is fixedly installed at one end of the L-shaped mounting plate (41). The inner wall of the slot of the limit plate (42) is engaged with one end of the bus arc rod. A connecting seat (43) is fixedly installed on the opposite surface of the other end of the two bending drive plates (510). A third telescopic cylinder (44) is fixedly installed at one end of the connecting seat (43). The telescopic end of the third telescopic cylinder (44) extends through and to one side of the connecting seat (43) and is located between the two bending drive plates (510). An active extrusion rod (45) is fixedly installed at the telescopic end of the third telescopic cylinder (44). One end of the active extrusion rod (45) is in contact with the surface of the bus arc rod.