Self-adaptive linkage clamping auxiliary device for construction engineering bending

Abstract

The application relates to the field of construction engineering machinery equipment, in particular to a self-adaptive linkage clamping auxiliary device for construction engineering bending, which comprises a workbench, a fixed shaft and a clamping assembly arranged on the workbench, a rotatable rocker arm arranged on the fixed shaft, and a compression roller installed on the rocker arm and used for pushing and pressing a workpiece to bend around the fixed shaft under the driving of the rotation of the rocker arm; a flexible pressure applying assembly is further arranged on the workbench, the flexible pressure applying assembly comprises a retractor and a pressure applying belt, one end of the pressure applying belt is wound on the retractor, and the other end is connected with a rotating shaft of the compression roller; the flexible pressure applying belt is drawn out through the rotation of the rocker arm, full-circular-arc continuous and pure mechanical self-adaptive envelope compression of a bending part are realized, and the problems of low reliability and uneven stress of discrete clamping are solved.

Description

Technical Field

[0001] This invention relates to the field of construction machinery and equipment, specifically to an adaptive linkage clamping auxiliary device for bending in construction engineering. Background Technology

[0002] In metal sheet or profile bending operations in the construction engineering field, to prevent outward elastic rebound and lateral warping of the upper and lower edges of thicker or wider heavy steel after forced plastic deformation, auxiliary clamping devices are usually required to limit and press the workpiece. To solve the above-mentioned fixing and pressing problems in the bending process, existing bending auxiliary equipment, such as the Chinese Patent Publication No. CN118403934B, discloses a step-by-step clamping scheme based on pneumatic control. This patent uses sensors to detect the rotation angle of the rotating pressure roller, and then controls multiple pneumatic valves to drive multiple pressure blocks arranged in a circular array to fall sequentially, thereby achieving follow-up step-by-step pressing of the bent part of the steel plate. However, in actual construction engineering applications, this follow-up pressing technology using a "mechanical-electrical-pneumatic" hybrid link is highly dependent on a closed-loop control system consisting of position sensors, electrically controlled valves, and multiple high-pressure air pipes. In the harsh working conditions of construction sites, filled with dust, intense vibration, and heavy loads, precision electronic components and pneumatic seals are prone to aging and failure, leading to sluggish clamping actions or complete shutdown. This results in extremely high maintenance costs and a low survival rate for the equipment. Furthermore, the step-by-step, independently descending clamping blocks are essentially a discrete, step-like clamping method. This method can only create discontinuous stress concentration points on the outer side of the workpiece, failing to achieve a uniform and smooth fit over the entire continuous curved surface. It easily produces localized indentations in the bending transition zone and cannot perfectly suppress the minor warping and instability that occurs in wider steel plates at the gaps between the clamping blocks. Summary of the Invention

[0003] To address the aforementioned issues, an adaptive linkage clamping auxiliary device for bending in building engineering is provided. By rotating the rocker arm to extract a flexible pressure band, it achieves continuous, purely mechanical adaptive envelope clamping of the bending part across the entire arc, completely solving the problems of low reliability and uneven force distribution in discrete clamping.

[0004] To address the problems of existing technologies, this invention provides an adaptive linkage clamping auxiliary device for bending in construction engineering, comprising a worktable and a fixed shaft and clamping assembly disposed on the worktable. A rotatable rocker arm is mounted on the fixed shaft, and a pressure roller is installed on the rocker arm for pressing the workpiece to bend around the fixed shaft under the rotation of the rocker arm. A flexible pressure application assembly is also disposed on the worktable, comprising a retractor and a pressure belt. One end of the pressure belt is wound around the retractor, and the other end is connected to the rotating shaft of the pressure roller. During the bending process, as the rocker arm rotates, the pressure belt is tangentially drawn out from the retractor and covers the outer surface of the bent portion of the workpiece. The contact angle between the pressure belt and the outer surface of the workpiece dynamically increases with the rotation of the rocker arm. Under the rewind tension of the retractor, the pressure belt generates a radial adaptive clamping force on the bent portion.

[0005] Preferably, the rocker arm has an adjusting groove extending along its length, and a mounting bracket slidably connected to the adjusting groove is provided in the adjusting groove, and the pressure roller is rotatably mounted on the mounting bracket.

[0006] Preferably, a bearing plate is provided at the end of the rocker arm away from the fixed axis; both the bearing plate and the bottom of the mounting bracket are equipped with casters, which roll in contact with the upper surface of the worktable to provide vertical support.

[0007] Preferably, the bearing plate is provided with a first lead screw parallel to the rocker arm, the first lead screw is threadedly connected to the bearing plate, one end of the first lead screw is rotatably connected to the mounting bracket, and the other end of the first lead screw is provided with a handle.

[0008] Preferably, the flexible pressure application assembly further includes a guide roller disposed beside the retractor; after the pressure application belt is drawn out from the retractor, it passes around the guide roller and then wraps around the surface of the workpiece.

[0009] Preferably, the worktable is provided with a first linear slide groove and an adjusting seat slidably connected to the first linear slide groove, and the guide roller is rotatably mounted on the adjusting seat.

[0010] Preferably, the pressure band is a composite flexible band, comprising a plurality of longitudinally arranged traction members parallel to each other along the pull-out direction and a plurality of pressure rods spaced apart on the traction members.

[0011] Preferably, the workbench is also equipped with a geared motor that is connected to the rocker arm drive.

[0012] Preferably, the worktable is provided with a second linear slide groove, and the clamping assembly includes a movable clamping block that can be slidably installed in the second linear slide groove; the movable clamping block moves toward the fixed shaft to press the starting end of the workpiece against the outer wall of the fixed shaft.

[0013] Preferably, the movable clamping block is provided with a flexible pressure plate on the side facing the fixed shaft. In the clamping state, the pressure plate deforms to fit the outer wall of the workpiece.

[0014] The advantages of this invention compared to the prior art are: 1. This invention utilizes a flexible pressure-applying component, employing the mechanical displacement of a rotating rocker arm to pull out a pressure band, dynamically enveloping the workpiece as the bending angle increases. The taut pressure band converts the end tension into a continuous radial clamping force pointing towards the center, replacing the traditional step-by-step, fixed pressure from electromechanical systems with a purely mechanical, continuously enveloping surface. This solution not only completely eliminates vulnerable sensors and pneumatic pipelines but also improves the operational reliability of the equipment in harsh construction sites. Furthermore, it achieves uniform and continuous pressure on any bent arc segment, perfectly suppressing the springback and warping deformation of heavy-duty construction steel.

[0015] 2. In the process of heavy-duty enveloping clamping using a flexible pressure belt, the rocker arm, as the cantilever end, must not only overcome enormous bending resistance but also withstand the huge reverse tensile tension transmitted by the pressure belt. To address this, the present invention provides a bearing plate at the end of the rocker arm furthest from the fixed axis, and installs casters at the bottom of both the bearing plate and the mounting frame. This arrangement provides a solid underlying rolling support for the cantilever end of the rocker arm, transforming the fragile cantilever force of the rocker arm into a stable simply supported force. This effectively eliminates the drooping or tilting of the rocker arm caused by combined overload, ensuring the absolute horizontality of the pressure roller's pushing trajectory and the pressure belt's stretching trajectory, thereby guaranteeing the uniformity of force and long-term structural stability of the entire flexible enveloping clamping system. Attached Figure Description

[0016] Figure 1 A three-dimensional structural diagram of an adaptive linkage clamping auxiliary device for bending in building engineering. Figure 1 .

[0017] Figure 2 This is a top view of an adaptive linkage clamping auxiliary device for bending in building engineering.

[0018] Figure 3 A three-dimensional structural diagram of an adaptive linkage clamping auxiliary device for bending in building engineering. Figure 2 .

[0019] Figure 4 This is a three-dimensional structural diagram of a worktable, fixed shaft, and rocker arm in an adaptive linkage clamping auxiliary device for bending in building engineering.

[0020] Figure 5 This is a three-dimensional structural diagram of a rocker arm, clamping assembly, and flexible pressure application assembly in an adaptive linkage clamping auxiliary device for bending in building engineering.

[0021] Figure 6 This is a three-dimensional structural diagram of the rocker arm and pressure roller in an adaptive linkage clamping auxiliary device for bending in construction engineering.

[0022] Figure 7 yes Figure 6 Enlarged view of point A in the middle.

[0023] Figure 8 This is a three-dimensional structural diagram of a rocker arm, guide roller, and clamping assembly in an adaptive linkage clamping auxiliary device for bending in building engineering.

[0024] Figure 9 This is a three-dimensional structural diagram of the guide roller in an adaptive linkage clamping auxiliary device for bending in building engineering.

[0025] Figure 10 This is a three-dimensional structural diagram of a clamping component in an adaptive linkage clamping auxiliary device for bending in building engineering.

[0026] The following are the labels in the diagram: 1. Workbench; 11. Fixed shaft; 12. Rocker arm; 121. Pressure roller; 1211. Mounting frame; 122. Adjusting slide; 123. Bearing plate; 1231. First lead screw; 1232. Handle; 124. Caster wheel; 125. Gear motor; 13. Clamping assembly; 131. Movable clamping block; 1311. Pressure plate; 132. Second linear slide; 14. Flexible pressure assembly; 141. Retractor; 142. Pressure belt; 1421. Traction component; 1422. Pressure rod; 143. Guide roller; 1431. Adjusting seat; 1432. First linear slide; 2. Workpiece. Detailed Implementation

[0027] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figures 1 to 5As shown: An adaptive linkage clamping auxiliary device for bending in construction engineering includes a worktable 1, a fixed shaft 11 and a clamping assembly 13 disposed on the worktable 1. A rotatable rocker arm 12 is disposed on the fixed shaft 11, and a pressure roller 121 is mounted on the rocker arm 12. The rocker arm 12 is used to push the workpiece 2 to bend around the fixed shaft 11 under the rotation drive of the rocker arm 12. A flexible pressure application assembly 14 is also disposed on the worktable 1. The flexible pressure application assembly 14 includes a retractor 141 and a pressure belt 142. One end of the pressure belt 142 is wound on the retractor 141, and the other end is connected to the rotating shaft of the pressure roller 121. During the bending process, as the rocker arm 12 rotates, the pressure band 142 is tangentially drawn out by the retractor 141 and wraps around and covers the outer surface of the bent portion of the workpiece 2. The contact angle between the pressure band 142 and the outer surface of the workpiece 2 increases dynamically with the rotation of the rocker arm 12. Under the rewinding tension of the retractor 141, the pressure band 142 generates a radial adaptive clamping force on the bent portion.

[0029] In metal sheet or profile bending operations in the construction engineering field, conventional equipment typically uses a swinging robotic arm to forcibly push the workpiece 2 around its central axis to undergo plastic deformation. However, when dealing with heavy construction steel with large thickness or width, the material generates significant deformation resistance and residual stress, causing the portion that has detached from the pressing and forming zone to easily experience outward elastic rebound or lateral warping deformation at the upper and lower edges. Traditional single-point pressing or array-type clamping methods are not only structurally cumbersome but also difficult to maintain uniform fit across the entire arc segment during continuous dynamic bending. To fundamentally solve the above technical problems, a worktable 1, a fixed shaft 11, and a clamping assembly 13 are set on the worktable 1. During operation, the clamping assembly 13 first anchors the starting end of the workpiece 2 to be bent to the side of the fixed shaft 11. Subsequently, a rotatable rocker arm 12 mounted on the fixed shaft 11 begins to operate. A pressure roller 121 is installed on the rocker arm 12, which, driven by the rotation of the rocker arm 12, pushes the workpiece 2 to continuously bend around the fixed shaft 11. To overcome the springback and warping of workpiece 2, a flexible pressure application component 14 is also provided on the worktable 1. This flexible pressure application component 14 abandons the complex electromechanical sensing feedback loop and adopts a purely mechanical passive envelope principle. The flexible pressure application component 14 includes a retractor 141 and a pressure belt 142. One end of the pressure belt 142 is wound on the retractor 141, and the other end is connected to the rotating shaft of the pressure roller 121. During the dynamic bending process, as the rocker arm 12 rotates continuously around the fixed shaft 11, the pressure roller 121 not only performs a pushing operation at the front end, but also pulls the pressure belt 142 tangentially out from the retractor 141, naturally enveloping and covering the outer surface of the bent part of workpiece 2. In this process, the contact angle between the pressure belt 142 and the outer surface of workpiece 2 naturally and dynamically increases with the rotation of the rocker arm 12.

[0030] In practical implementation, the retractor 141 is internally equipped with an energy storage elastic element for accumulating torque, such as an industrial-grade spiral spring, a constant-force spring, or a heavy-duty torsion spring, to provide stable and continuous rewinding damping force. It should be objectively noted that in the initial stage of the bending action, since the pressure band 142, drawn from the stationary retractor 141 to the arc surface of the workpiece 2, inevitably traverses a straight tangential trajectory, a small gap of unfitted contact will inevitably exist near the starting end of the bend. However, in actual operation, the starting end of the workpiece 2 is absolutely rigidly locked by the aforementioned clamping assembly 13, and this area itself possesses extremely strong anti-deformation stiffness, requiring no additional pressure from the flexible band. The main function of the pressure band 142 is to press down those already formed arc segments that have detached from the pressure roller 121 and have elastically rebounded or warped as the wrap angle dynamically expands. Therefore, based on the mechanical principle that the flexible belt generates radial pressure under tension, under the continuous output of the rewind tension from the retractor 141, the taut pressure belt 142 will convert the linear tension at both ends into a centripetal force pointing towards the center of the fixed axis 11, thereby generating a continuous, uniform, and radially adaptive clamping force on the bent portion of the workpiece 2. This allows it to match any bending angle of the workpiece 2 and automatically adapt to minute contour changes on the surface of the workpiece 2 using the properties of flexible materials, completely eliminating local stress concentration and indentations caused by discrete clamping, and ensuring high-precision forming of the structural steel.

[0031] like Figures 2 to 6 As shown: The rocker arm 12 has an adjustment groove 122 extending along its length direction. The adjustment groove 122 is provided with a mounting bracket 1211 that is slidably connected to it. The pressure roller 121 is rotatably mounted on the mounting bracket 1211.

[0032] In order to cope with workpieces 2 of different specifications and thicknesses, i.e. plates, and to achieve flexible production of the equipment, the rocker arm 12 is provided with an adjustment groove 122 and a mounting bracket 1211. By changing the position of the mounting bracket 1211 on the adjustment groove 122, the operator can precisely adjust the radial gap between the pressure roller 121 and the fixed shaft 11, thereby ensuring that the pressure roller 121 always applies force to the outer wall of the workpiece 2 of different thicknesses with the best geometric entry point.

[0033] like Figures 3 to 7 As shown: a bearing plate 123 is provided at one end of the rocker arm 12 away from the fixed shaft 11; both the bearing plate 123 and the mounting bracket 1211 are equipped with casters 124 at their bottoms, and the casters 124 roll in contact with the upper surface of the worktable 1 to provide vertical support.

[0034] Under bending conditions, the rocker arm 12, as a cantilever beam structure, is prone to downward bending moment and deflection deformation when subjected to a huge reaction force from the push plate at its end. This can lead to skewness of the pressure roller 121 and uneven stress on the workpiece 2. To address this, a bearing plate 123 is provided at the end of the rocker arm 12 away from the fixed shaft 11. Both the bearing plate 123 and the bottom of the mounting bracket 1211 are equipped with casters 124, which maintain rolling contact with the upper surface of the worktable 1 to provide solid vertical support. This design transforms the stress model of the rocker arm 12 from a fragile cantilever stress to a stable simply supported stress, effectively eliminating the drooping phenomenon under heavy loads and greatly improving the overall structural rigidity and service life of the equipment.

[0035] like Figures 3 to 6 and Figure 8 As shown: A first lead screw 1231 parallel to the rocker arm 12 is provided on the support plate 123. The first lead screw 1231 is threadedly connected to the support plate 123. One end of the first lead screw 1231 is rotatably connected to the mounting bracket 1211. The other end of the first lead screw 1231 is provided with a handle 1232.

[0036] To achieve precise and effortless adjustment of the position of the pressure roller 121, a first lead screw 1231 parallel to the rocker arm 12 is provided on the support plate 123. The first lead screw 1231 is threadedly connected to the support plate 123, and one end of the first lead screw 1231 is rotatably connected to the mounting bracket 1211, while the other end of the first lead screw 1231 is provided with a handle 1232. When the operator turns the handle 1232, the first lead screw 1231 rotates within the threaded hole of the support plate 123, generating axial displacement. Since the end of the first lead screw 1231 is only rotatably connected to the mounting bracket 1211 without relative axial displacement, the rotating first lead screw 1231 can smoothly push and pull the mounting bracket 1211 to perform micro-distance linear sliding within the adjusting groove 122. This first lead screw 1231 transmission mechanism utilizes the effort-saving and self-locking characteristics of the thread, making the spacing adjustment of the heavy-duty pressure roller 121 easy and preventing displacement and deviation during bending and vibration.

[0037] like Figures 1 to 4 , Figures 8 to 10 As shown: The flexible pressure application assembly 14 also includes a guide roller 143 disposed beside the retractor 141; after the pressure application belt 142 is drawn out from the retractor 141, it passes around the guide roller 143 and then wraps around the surface of the workpiece 2.

[0038] As the pressure belt 142 is continuously pulled out, the winding diameter of the pressure belt 142 on the retractor 141 gradually decreases. If the pressure belt 142 is directly led to the workpiece 2, the position and angle of its lead-out tangent will dynamically shift, potentially leading to poor initial wrapping or interference and scratching with surrounding components. To isolate the negative geometric effects caused by this change in winding diameter, the flexible pressure application assembly 14 also includes a guide roller 143 disposed beside the retractor 141. After the pressure belt 142 is led out from the retractor 141, it is forcibly bypassed by the guide roller 143 before wrapping around the surface of the workpiece 2. The guide roller 143 acts as a constant spatial coordinate reference point, ensuring that the tangent trajectory of the pressure belt 142 cutting into the surface of the workpiece 2 remains absolutely consistent, cutting off the kinematic interference between the front-end working trajectory and the rear-end energy storage mechanism.

[0039] like Figures 1 to 4 , Figures 8 to 10 As shown: The workbench 1 is provided with a first linear slide groove 1432 and an adjusting seat 1431 that is slidably connected to the first linear slide groove 1432. The guide roller 143 is rotatably mounted on the adjusting seat 1431.

[0040] Furthermore, to accommodate special workpieces 2 with significantly different radii of curvature, the worktable 1 is equipped with a first linear groove 1432 and an adjusting seat 1431 slidably connected to the first linear groove 1432. The guide roller 143 is rotatably mounted on the adjusting seat 1431. By sliding the adjusting seat 1431, the physical position of the guide roller 143 can be manually changed, thereby fine-tuning the initial angle and tension vector distribution of the pressure band 142 cutting into the surface of the workpiece 2, giving the equipment a wider process compatibility window. In specific implementation, the sliding drive and locking mechanism of the adjusting seat 1431 within the first linear groove 1432 can specifically employ a trapezoidal screw mechanism with a manual crank for position fine-tuning and thread self-locking, or a servo electric cylinder, a heavy-duty hydraulic push rod, and a lateral mechanical clamping handle to achieve precise pushing and pulling and strong fixing of the guide roller 143, preventing accidental slippage when subjected to the tension of the pressure band 142.

[0041] like Figures 1 to 5 and Figure 8 As shown: The pressure band 142 is a composite flexible band, including a plurality of longitudinal traction members 1421 arranged parallel to each other along the pull-out direction and a plurality of pressure rods 1422 spaced apart on the traction members 1421.

[0042] Considering that while a simple polymer flexible strip possesses excellent bending and wrapping properties in the longitudinal direction, it may lack sufficient shear stiffness in the transverse direction (i.e., the height direction parallel to the fixed axis 11) to suppress the vertical warping deformation of heavy steel plates, the pressure band 142 is configured as a composite flexible strip. This composite flexible strip includes multiple longitudinal traction members 1421 arranged parallel to the pull-out direction, and multiple pressure rods 1422 spaced apart on the traction members 1421. In specific implementations, the longitudinal traction members 1421 can be selected from multiple industrial-grade steel wire ropes, Kevlar fiber braided belts, or high-strength polyurethane synchronous belts to withstand extreme rewinding tension; while the pressure rods 1422 can specifically be solid stainless steel cylinders, high-rigidity alloy square tubes, or rigid polytetrafluoroethylene support strips. Through this structure, while ensuring perfect flexible wrapping in the circumferential direction, the transversely arranged rigid pressure rods 1422 convert radial tension into a rigid line contact surface clamping force, preventing three-dimensional instability during plate bending.

[0043] like Figures 1 to 3 As shown: The workbench 1 is also equipped with a reduction motor 125 that is connected to the rocker arm 12 in a transmission manner.

[0044] At the power input end of the equipment, the taut pressure belt 142 and the bent steel will generate huge elastic rebound forces. Without a reliable braking anti-reverse mechanism, the rocker arm 12 is prone to dangerous and violent rebound at the moment of stopping. Therefore, a geared motor 125 connected to the rocker arm 12 is also installed on the workbench 1. The geared motor 125 can be an asynchronous motor with a worm gear reducer, a servo motor equipped with an electromagnetic brake, or a swing motor with a hydraulic locking circuit. These specially configured motors can not only output a stable thrust with low speed and high torque, but more importantly, they can utilize the physical irreversible self-locking characteristics of the worm gear or the mechanical locking function of the brake to ensure that the rocker arm 12 is locked at the current angle as if welded in any power failure or shutdown state, absolutely resisting the strong reverse pull from the pressure belt 142 and the workpiece 2, thus ensuring the safety of personnel and equipment during construction.

[0045] like Figures 2 to 5 , Figure 8 and Figure 10 As shown: The worktable 1 is provided with a second linear slide groove 132, and the clamping assembly 13 includes a movable clamping block 131 that can be slidably installed in the second linear slide groove 132; the movable clamping block 131 moves toward the fixed shaft 11 to press the starting end of the workpiece 2 against the outer wall of the fixed shaft 11.

[0046] like Figures 2 to 5 , Figure 8 and Figure 10As shown: The movable clamping block 131 is provided with a flexible pressure plate 1311 on the side facing the fixed shaft 11. In the clamping state, the pressure plate 1311 deforms to fit the outer wall of the workpiece 2.

[0047] For anchoring the initial end of workpiece 2, a second linear slide 132 is provided on the worktable 1. The clamping assembly 13 includes a movable clamping block 131 that can be slidably installed within the second linear slide 132. The movable clamping block 131 moves toward the fixed shaft 11 to press the starting end of workpiece 2 against the outer wall of the fixed shaft 11. This linear guide type clamping setup can provide extremely high lateral thrust, ensuring that the starting point of workpiece 2 will not experience any axial movement or circumferential slippage when encountering a huge bending moment. To achieve high-pressure advance, retreat, and locking of the movable clamping block 131 within the second linear slide 132, the underlying drive source can specifically be a heavy-duty hydraulic cylinder, a high-thrust electric push rod, or a mechanical toggle-type quick clamp with an eccentric cam. This clamping setup, with a powerful drive source and linear guide type, can provide extremely high lateral thrust toward the fixed shaft 11, ensuring that the starting point of workpiece 2 remains motionless and will not experience axial movement or circumferential slippage when encountering a huge bending dynamic moment. Based on this, since different workpieces 2 have different surface roughness or micro-curvature, direct compression by rigid clamping blocks can easily cause uneven clamping force distribution or surface indentation damage. Therefore, a flexible pressure plate 1311 is specially provided on the side of the movable clamping block 131 facing the fixed shaft 11. In the clamping state, the flexible pressure plate 1311 will undergo adaptive elastic deformation under force to perfectly fit and wrap the joint surface of the starting end of the workpiece 2 and the fixed shaft 11. The flexible pressure plate 1311 can be made of high-density nitrile rubber pad, polyurethane elastomer, or thickened silicone buffer layer with anti-slip texture. It not only significantly increases the actual contact area to improve static friction, but also plays an excellent buffering and protection role. Even without this pressure plate 1311, the clamping assembly 13 can complete the basic fixation using the rigid metal surface, but with the addition of this component, the anti-slip capability of the equipment and the protection quality of the weak workpiece 2 surface are both improved.

[0048] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. An adaptive linkage clamping auxiliary device for bending in construction engineering, comprising a worktable and a fixed shaft and clamping assembly disposed on the worktable, wherein a rotatable rocker arm is disposed on the fixed shaft and a pressure roller is mounted on the rocker arm, for pushing the workpiece to bend around the fixed shaft under the rotation drive of the rocker arm; Its features are, The workbench is also equipped with a flexible pressure application assembly, which includes a retractor, a guide roller, and a pressure belt. One end of the pressure belt is wound around the retractor, and the other end is connected to the shaft of the pressure roller. The pressure belt is a composite flexible belt, which includes multiple longitudinal traction members arranged parallel to the pull-out direction and multiple pressure rods spaced apart on the traction members. The guide roller is located next to the retractor. After the pressure belt is drawn out from the retractor, it passes around the guide roller and then wraps around the surface of the workpiece. During the bending process, as the rocker arm rotates, the pressure band is tangentially drawn out by the retractor and wraps around the outer surface of the bent part of the workpiece. The contact angle between the pressure band and the outer surface of the workpiece dynamically increases with the rotation of the rocker arm. Under the rewinding tension of the retractor, the pressure band generates a radial adaptive clamping force on the bent part.

2. The adaptive linkage clamping auxiliary device for bending in building engineering according to claim 1, characterized in that, The rocker arm has an adjusting groove extending along its length, and a mounting bracket is slidably connected to the adjusting groove. The pressure roller is rotatably mounted on the mounting bracket.

3. The adaptive linkage clamping auxiliary device for bending in building engineering according to claim 2, characterized in that, A bearing plate is provided at one end of the rocker arm away from the fixed axis; both the bearing plate and the bottom of the mounting bracket are equipped with casters, which roll in contact with the upper surface of the workbench to provide vertical support.

4. The adaptive linkage clamping auxiliary device for bending in building engineering according to claim 3, characterized in that, The support plate is provided with a first lead screw parallel to the rocker arm. The first lead screw is threadedly connected to the support plate. One end of the first lead screw is rotatably connected to the mounting bracket, and the other end of the first lead screw is provided with a handle.

5. The adaptive linkage clamping auxiliary device for bending in building engineering according to claim 1, characterized in that, The workbench is provided with a first linear slide groove and an adjusting seat that is slidably connected to the first linear slide groove, and the guide roller is rotatably mounted on the adjusting seat.

6. The adaptive linkage clamping auxiliary device for bending in building engineering according to claim 1, characterized in that, The workbench is also equipped with a reduction motor that is connected to the rocker arm drive.

7. The adaptive linkage clamping auxiliary device for bending in building engineering according to claim 1, characterized in that, The worktable is provided with a second linear slide groove, and the clamping assembly includes a movable clamping block that can be slidably installed in the second linear slide groove; the movable clamping block moves toward the fixed shaft to press the starting end of the workpiece against the outer wall of the fixed shaft.

8. The adaptive linkage clamping auxiliary device for bending in building engineering according to claim 7, characterized in that, The movable clamping block has a flexible pressure plate on the side facing the fixed shaft. In the clamping state, the pressure plate deforms to fit the outer wall of the workpiece.

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