A hydraulic straightening device for downfolding arms

Abstract

The utility model provides a kind of lower folding arm hydraulic shape correcting device, including shape correcting frame, install the hydraulic station on shape correcting frame, install the hydraulic shape correcting assembly on shape correcting frame and connect with hydraulic station through oil circuit, the hydraulic shape correcting assembly includes double shaft extension type hydraulic cylinder, this hydraulic cylinder is transversely arranged on shape correcting frame, and the both sides piston rod end portion is connected with shape correcting head, and shape correcting frame bottom is equipped with multiple universal wheels and constitutes movable shape correcting trolley.The utility model's lower folding arm hydraulic shape correcting device realizes the automatic correction of the deformation of lower folding arm after welding by integrated hydraulic drive system and double shaft synchronous shape correcting mechanism, substantially reduces the time of traditional manual shape correcting, solves the problems of low shape correcting efficiency, high labor intensity, poor shape correcting precision and consistency in prior art, significantly improves production efficiency and product quality stability.

Description

Technical Field

[0001] This utility model relates to the field of metal component processing equipment, and in particular to a hydraulic straightening device for a folding arm. Background Technology

[0002] In the manufacturing of heavy machinery, engineering vehicles, or similar equipment, the production of large metal structural components (such as articulated booms and excavator booms) is a fundamental step. These components are typically formed by connecting multiple metal parts through welding to achieve complex structural shapes and high load-bearing capacity. Welding, as a critical joining process, generates localized high temperatures in the weld area, and the uneven cooling process after welding creates significant thermal stress within the workpiece. When this thermal stress is released, it inevitably leads to deformations such as bending and twisting of the component. To ensure the dimensional accuracy, smooth assembly, and proper function of the final product, "shaping" (i.e., reshaping and straightening) of the welded components is an essential and critical step in the production process.

[0003] In existing welding component straightening techniques, the straightening of large components such as folding arms still predominantly relies on traditional manual or semi-manual methods. Operators typically use simple tools such as manual hydraulic jacks and pry bars, relying entirely on personal experience to apply external force to the deformed parts of the component for correction. In practice, workers need to repeatedly manually pump the jack handle to push the deformed area in the opposite direction until the component's dimensions return to the design tolerances. This traditional straightening method is firstly extremely inefficient, entirely dependent on manual operation. Using manual hydraulic jacks requires prolonged and repeated pumping to achieve sufficient straightening pressure; straightening a single workpiece typically takes about ten minutes, severely restricting production cycle time and overall output efficiency. Secondly, it is labor-intensive; manual straightening is heavy physical labor, causing significant physical exertion for operators, leading to fatigue, which not only affects work efficiency but also makes it difficult to ensure stability during long-term operation. Furthermore, the calibration accuracy and consistency are poor. This method is highly dependent on the skills and experience of the operators. The magnitude, point of application, and duration of the calibration force are all determined by manual sense and visual judgment, lacking precise quantitative control. This leads to poor consistency in calibration results, unstable product quality, and may even result in overcorrection or inadequate calibration. Finally, the integration and automation levels are low. The primitive operation method makes it difficult to effectively integrate with modern production lines, resulting in almost zero automation. This becomes an efficiency bottleneck in the entire production process, increasing the production cost per unit product.

[0004] Therefore, how to provide an automated or semi-automated device that can replace traditional manual operations, significantly improve the efficiency of forming, reduce labor intensity, and accurately control the forming process is a technical problem that urgently needs to be solved in the current production of large welded components. Utility Model Content

[0005] The technical problem to be solved by this utility model is to address the issue that in the prior art, when correcting the deformation of the lower folding arm after welding, manual operation mainly relies on tools such as hydraulic jacks, which leads to low production efficiency, high labor intensity for workers, and difficulty in ensuring the accuracy and consistency of the correction. The present invention provides a hydraulic correction device for the lower folding arm that is highly automated, accurate in correction, and easy to operate.

[0006] The technical solution adopted by this utility model to solve its technical problem is: A hydraulic alignment device for a folding arm, comprising: The calibration frame is a frame structure; The hydraulic power unit is mounted on the calibration vehicle frame. The hydraulic alignment assembly is mounted on the alignment frame and connected to the hydraulic station via an oil circuit. The hydraulic alignment assembly includes a dual-shaft extension type hydraulic cylinder, which is laterally mounted on the alignment frame. Both piston rod ends of the dual-shaft extension type hydraulic cylinder are connected to alignment tops.

[0007] Preferably, the bottom of the alignment frame is equipped with multiple swivel wheels.

[0008] Preferably, the calibration frame is divided into upper and lower spaces, with the hydraulic calibration assembly installed in the upper space and the hydraulic station installed in the lower space.

[0009] Preferably, the dual-shaft extension type hydraulic cylinder is mounted on the alignment frame via a cylinder mounting bracket and locked by installing a locking nut.

[0010] Preferably, the shaping head is a top block that is detachably connected to the end of the piston rod, and the top block is provided with a pressing surface that is adapted to the contact surface of the lower folding arm.

[0011] Preferably, the hydraulic station includes an oil tank, a motor, an oil pump, and a control valve assembly.

[0012] Preferably, it also includes an electrical control system, which is electrically connected to the control valve group of the hydraulic station and is used to control the extension and retraction of the piston rod of the dual-shaft extension type hydraulic cylinder.

[0013] Preferably, the dual-axis extension type hydraulic cylinder adopts a synchronous extension mechanism.

[0014] The beneficial effects of this utility model include the following: 1. This device uses a hydraulic station to drive a high-thrust cylinder for automated alignment, replacing the traditional time-consuming and labor-intensive manual hydraulic jack operation. Operators can quickly complete the alignment process by simply using the electrical control system, significantly reducing the alignment time for a single workpiece, increasing efficiency several times over, and greatly reducing the physical exertion of workers.

[0015] 2. This device integrates the hydraulic system, actuators, and control system required for calibration onto a single movable frame, forming an independent and fully functional work unit. It occupies a small area, is highly mobile, and can be easily deployed anywhere on the production line. The entire operation is simplified to placing the workpiece and pressing a button; the process is simple, requires minimal operator skill, and avoids potential safety risks associated with manual operation. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural view of the hydraulic alignment device for the lower folding arm in Example 1; Figure 2 This is a side view of the structure of the hydraulic alignment device for the lower folding arm in Example 1; Figure 3 This is a cross-sectional view of the hydraulic alignment assembly in Example 1.

[0017] Reference numerals: 1. Shaping frame; 2. Hydraulic station; 3. Hydraulic shaping assembly; 31. Hydraulic cylinder; 32. Cylinder mounting base; 33. Piston rod; 34. Shaping top; 4. Caster wheel; 5. Lower folding arm. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, but these specific embodiments do not limit the scope of protection of the present invention in any way. Example

[0019] The hydraulic straightening device for the lower folding arm of this utility model includes a straightening frame 1, a hydraulic station 2, a hydraulic straightening assembly 3, an electrical control system, and multiple casters 4.

[0020] like Figure 1-2 As shown, the aforementioned alignment frame 1 is a welded steel structure with an overall rectangular frame structure, divided into upper and lower spaces. The upper space is used to install the hydraulic alignment assembly 3, and the lower space is used to integrate and install the hydraulic station 2. Multiple casters 4 are fixedly installed at the bottom of the alignment frame 1, forming a movable alignment trolley that is easy to move and position flexibly within the production workshop.

[0021] The aforementioned hydraulic power unit 2 is integrated and installed in the lower space of the calibration frame 1. The hydraulic power unit 2 includes an oil tank, a motor, an oil pump, and a control valve assembly. The oil tank stores hydraulic oil, the motor drives the oil pump, and the control valve assembly controls the flow and pressure of the hydraulic oil. The hydraulic power unit 2 is connected to the hydraulic calibration assembly 3 via oil pipelines, providing a stable and reliable hydraulic power source for calibration operations.

[0022] like Figure 1 and Figure 3 As shown, the aforementioned hydraulic straightening assembly 3 is installed on the upper layer of the straightening frame 1. The hydraulic straightening assembly 3 includes a dual-axis extension type hydraulic cylinder 31. The axis of the hydraulic cylinder 31 is perpendicular to the length direction of the lower folding arm 5 to be straightened, and it is installed on the straightening frame 1 through a cylinder fixing mounting seat 32, and then locked by installing a locking nut. The dual-axis extension type hydraulic cylinder 31 adopts a synchronous extension mechanism. The synchronous extension mechanism realizes the synchronous extension of the piston rods 33 on both sides through a built-in flow divider valve. The flow divider valve distributes the hydraulic oil from the hydraulic station 2 to the oil inlet chambers on both sides of the hydraulic cylinder 31, ensuring that the piston rods 33 on both sides move synchronously and ensuring a uniform distribution of straightening force. When the hydraulic cylinder 31 is working, it can apply a lateral corrective force to the bent and deformed part of the lower folding arm 5. The ends of the piston rods 33 on both sides of the hydraulic cylinder 31 are connected to straightening heads 34. In this embodiment, the hydraulic cylinder 31 has a cylinder diameter of Φ180mm, the piston rod 33 has a rod diameter of Φ120mm, a single-sided stroke of 50mm, and a maximum working pressure of 21MPa. According to Pascal's law, the maximum single-sided corrective force can reach approximately 530kN, and the total corrective force on both sides is approximately 1060kN.

[0023] like Figure 3 As shown, the aforementioned alignment mandrel 34 is a detachable block connected to the end of the piston rod 33. The block has a pressing surface that matches the contact surface of the lower folding arm 5 to increase the contact area and stabilize the force application. The alignment mandrel 34 is connected to the piston rod 33 by a threaded connection and can be replaced according to different specifications of the lower folding arm 5 to meet different alignment requirements.

[0024] The aforementioned electrical control system (not shown in the figure) is electrically connected to the control valve group of the hydraulic station 2. The electrical control system includes a control panel, an electrical control cabinet, and related connection lines. The control panel is equipped with start, stop, forward, and reverse buttons for one-button or push-button control of the synchronous extension and retraction of the piston rod 33 of the hydraulic cylinder 31. The electrical control cabinet integrates electrical components such as relays and contactors, and uses a PLC controller to achieve precise control of the motor and control valve group of the hydraulic station 2, ensuring the stability and repeatability of the calibration process.

[0025] The working principle and method of the hydraulic straightening device for the lower folding arm 5 of this utility model are as follows: In actual use, the lower folding arm 5 that needs to be shaped is first placed on the upper plane of the shaped frame 1 using a hoisting device. The deformed part of the lower folding arm 5 is positioned in the middle of the two shaped head 34 to ensure that the point of application of the shaped force is accurate. The appropriate shaped head 34 is selected according to the specifications of the lower folding arm 5 and installed at the end of the piston rod 33 of the hydraulic cylinder 31.

[0026] Specifically, during the alignment operation, the operator starts the hydraulic station 2, the motor begins to work, and the oil pump draws hydraulic oil from the oil tank and pressurizes it. By pressing the forward button through the electrical control system, the control valve group is activated, and hydraulic oil enters the oil inlet chamber of the hydraulic cylinder 31, pushing the piston and piston rod 33 outward. Due to the use of a dual-shaft extension type hydraulic cylinder 31, the piston rods 33 on both sides extend synchronously, and the alignment mandrel 34 simultaneously contacts the deformed part of the lower folding arm 5, applying a lateral correction force to it.

[0027] Once the alignment mandrel 34 contacts the lower folding arm 5, the hydraulic pressure continues to increase, gradually increasing the alignment force. Under the action of the lateral alignment force, the lower folding arm 5 begins to undergo elastic deformation, gradually returning to the straight state required by the design. The operator can judge the alignment effect by observing the deformation of the lower folding arm 5 and the pressure gauge reading. When the lower folding arm 5 returns to the design tolerance range, the pressure is stopped.

[0028] After the alignment is completed, press the reverse button to switch the control valve group. Hydraulic oil enters the return oil chamber of hydraulic cylinder 31, and piston rod 33 begins to retract. Alignment head 34 disengages from lower folding arm 5. The entire alignment process is precisely controlled and easy to operate. The alignment time for a single lower folding arm 5 is reduced from the traditional ten minutes to one to two minutes.

[0029] Furthermore, due to the stable and controllable correction force provided by the hydraulic system, this device can apply a more uniform and precise correction force compared to traditional manual hydraulic jacks. The flow divider valve ensures that the dual-axis synchronous extension mechanism ensures that both correction mandrels 34 contact the workpiece simultaneously, avoiding secondary deformation caused by unilateral force. The accuracy of the correction force is controlled within ±2%, greatly improving the stability of the correction quality.

[0030] In summary, the advantages of this utility model lie in its integrated design, which combines the hydraulic station 2, the alignment assembly 3, and the control system onto a single movable alignment frame 1, forming a complete alignment operation unit. Operators only need to place the lower folding arm 5 on the alignment frame 1, and the entire alignment process can be completed through the electrical control system, greatly improving production efficiency, reducing labor intensity, and ensuring consistency in alignment accuracy and product quality.

[0031] On the other hand, thanks to the omnidirectional wheels, the entire device can be easily moved to any position on the production line to adapt to different production layout requirements. When the production line is adjusted or equipment is maintained, the device can be moved quickly without affecting other production processes. Furthermore, the electrical control system ensures fully automated operation, avoiding human error and safety risks inherent in traditional manual operation.

[0032] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any innovative improvements or substitutions based on this utility model should fall within the scope of the claims of this utility model. Furthermore, the parameters, materials, and processes mentioned in the above embodiments are not unique. Without departing from the technical essence of this utility model, those skilled in the art can make various alternative choices, and these alternative solutions should also be considered to fall within the scope of protection of this utility model.

Claims

1. A hydraulic alignment device for a folding arm, characterized in that, include: The calibration frame is a frame structure; The hydraulic power unit is mounted on the calibration vehicle frame. The hydraulic alignment assembly is mounted on the alignment frame and connected to the hydraulic station via an oil circuit. The hydraulic alignment assembly includes a dual-shaft extension type hydraulic cylinder, which is laterally mounted on the alignment frame. Both piston rod ends of the dual-shaft extension type hydraulic cylinder are connected to alignment tops.

2. The hydraulic alignment device for the lower folding arm according to claim 1, characterized in that, The bottom of the calibration vehicle frame is equipped with multiple omnidirectional wheels.

3. The hydraulic alignment device for the lower folding arm according to claim 1, characterized in that, The calibration frame is divided into upper and lower spaces. The hydraulic calibration assembly is installed in the upper space, and the hydraulic station is installed in the lower space.

4. The hydraulic alignment device for a lower folding arm according to claim 1, characterized in that, The dual-shaft extension type hydraulic cylinder is mounted on the alignment frame via a cylinder mounting bracket and locked by installing a locking nut.

5. The hydraulic alignment device for a lower folding arm according to claim 1, characterized in that, The adjusting top is a top block that is detachably connected to the end of the piston rod, and the top block is provided with a pressing surface that is adapted to the contact surface of the lower folding arm.

6. The hydraulic alignment device for a lower folding arm according to claim 1, characterized in that, The hydraulic station includes an oil tank, a motor, an oil pump, and a control valve assembly.

7. The hydraulic alignment device for a lower folding arm according to claim 1, characterized in that, It also includes an electrical control system, which is electrically connected to the control valve group of the hydraulic station and is used to control the extension and retraction of the piston rod of the dual-shaft extension type hydraulic cylinder.

8. The hydraulic alignment device for a lower folding arm according to claim 1, characterized in that, The dual-axis extension type hydraulic cylinder adopts a synchronous extension mechanism.

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