Servo Pressing Arm Mechanism for Heavy-Load Precision Bending
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Solution Overview
Problem
Current numerical control metal sheet bending equipment faces challenges with hydraulic driving systems, including high noise, energy consumption, precision issues, and environmental pollution, while mechanical all-electric servo systems struggle with power utilization and kinematic control for heavy loads, limiting their ability to replace traditional hydraulic transmission effectively.
Innovation Solution
A heavy-load and high-precision transmission mechanism using pressing arms, connecting rods, hinged supports, and all-electric servo motors, which allows for precise control and energy conservation, suitable for loads above 80 tons, with a simpler inverse kinematics solution and improved rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If hydraulic driving is used for large tonnage bending, then driving capability for loads above 80 tons is achieved, but noise, energy consumption, and environmental pollution increase
Solution Approach 1:
The patent replaces the hydraulic driving system with a mechanical all-electric servo system. The servo motor directly drives the ball screw, which converts rotational motion to linear motion for the cross beam. This substitution eliminates hydraulic oil leakage and noise while maintaining the required driving capability for heavy loads through the high mechanical advantage of the ball screw mechanism.
Solution Approach 2:
The patent extracts and removes the hydraulic system components (hydraulic cylinders, valve groups, hydraulic pumps) from the bending machine. By eliminating these components entirely and replacing them with an all-electric servo system, the harmful factors associated with hydraulic systems (noise, pollution, energy consumption) are removed while preserving the force output capability.
2Force
If hydraulic driving is used, then large tonnage driving is achieved, but position precision and controllability deteriorate
Solution Approach 1:
The patent replaces the hydraulic positioning system with a mechanical all-electric servo system. The servo motor provides precise rotational control, and the ball screw mechanism converts this to highly accurate linear positioning of the cross beam. This mechanical substitution enables superior position precision and controllability compared to hydraulic systems, while maintaining the ability to handle heavy loads.
3Manufacturing precision
If mechanical all-electric servo with ball screw is used for small tonnage, then high precision and simple structure are achieved, but power utilization rate deteriorates
Solution Approach 1:
The patent implements a dynamic driving mechanism where the servo motor can adjust its output characteristics in real-time. The system uses a crank mechanism with adjustable crank radius that allows optimization of the mechanical advantage ratio between the motor and the cross beam. This dynamic adjustment enables high power utilization by matching the motor output to the actual load requirements throughout the bending cycle, reducing energy waste.
4Loss of energy
If mechanical all-electric servo is used for heavy load, then energy conservation is achieved, but transmission mechanism complexity increases
Solution Approach 1:
The patent designs a multi-functional transmission mechanism where the ball screw serves multiple purposes: it provides the primary mechanical advantage for heavy load lifting, enables precise positioning through its inherent mechanical feedback, and allows for adjustable stroke length. The crank mechanism with adjustable radius provides both the necessary mechanical advantage variation and the ability to optimize power utilization. This multi-functionality reduces the need for additional separate components, managing system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides energy conservation, environmental protection, and high precision, enabling efficient operation for large tonnage bending with reduced noise and stress concentration, while enhancing the machine's rigidity and control accuracy.
Implementation Method 1
The all-electric servo motor drives the ball screw to move the pressing arm lifting assembly
Implementation Method 2
A front end part of each pressing arm facing the upper cross beam is hinged at a top end of the connecting rod, and a bottom end of the connecting rod is hinged with the upper cross beam
Implementation Method 3
An intermediate part of each pressing arm or a rear end part of each pressing arm away from the upper cross beam is hinged on the hinged support
Data Source
AI summary
A heavy-load and high-precision transmission mechanism applicable to sheet-metal bending equipment, which includes pressing arms, connecting rods, hinged supports, pressing arm lifting assemblies and pressing arm lifting driving assemblies. The pressing arms are symmetrically arranged on a top part of a rack. A front end part of each pressing arm facing an upper cross beam is hinged with the cross beam through the connecting rod. An intermediate part of each pressing arm or a rear end part of each pressing arm away from the cross beam is hinged on the rack through the hinged support. The rear end part or the intermediate part of each pressing arm is provided with a set of pressing arm lifting assemblies. Each set of pressing arm lifting assemblies is connected with a set of pressing arm lifting driving assemblies. Each set of pressing arm lifting driving assembly includes an all-electric servo motor.