Closed Hydraulic Ring Line for Bending Press
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Solution Overview
Problem
Existing drive technologies for bending presses face inefficiencies due to high energy consumption, noise pollution, and a non-modular, complex structure, which leads to increased environmental impact and maintenance challenges.
Innovation Solution
A closed hydraulic system with a ring line and pressure accumulator is implemented, reducing the volume of pressure medium required and enabling efficient energy use, while allowing for stop/go operations and minimizing noise emissions, thus achieving a compact, modular design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an open hydraulic system with a tank is used to supply pressure medium to pressure chambers, then the system can accommodate different filling volumes of the pressure chambers, but the total volume and delivery volume of the pressure medium must be correspondingly high, leading to increased energy consumption and a non-compact structure
Solution Approach 1:
The invention extracts the tank from the hydraulic system, replacing it with a closed circuit and pressure accumulator. This removes the need for large volumes of pressure medium while maintaining the ability to accommodate different filling volumes through the accumulator's compression/expansion mechanism.
Solution Approach 2:
The invention changes the physical state parameters of the pressure medium by introducing a compressible gas charge in the pressure accumulator. This allows the system to handle variable volume requirements without requiring proportionally large amounts of hydraulic fluid, thereby reducing energy consumption and system size.
2Reliability
If an open hydraulic system with high delivery volume is used, then the different filling volumes of pressure chambers can be compensated, but the system requires high total volume of pressure medium, leading to increased device complexity and larger component sizes
Solution Approach 1:
The tank is removed from the system and replaced with a closed circuit configuration incorporating a pressure accumulator. This eliminates the need for large system volumes while maintaining volume compensation capability through the accumulator's elastic element.
Solution Approach 2:
The pressure accumulator acts as an intermediary between the hydraulic pump and the pressure chambers. It mediates the volume differences by compressing and expanding its elastic element, allowing reliable volume compensation without requiring large overall system dimensions.
3Stress or pressure
If a hydraulic system operates continuously to maintain pressure, then pressure stability is achieved, but noise emissions and energy consumption increase due to non-stop pump and motor operation
Solution Approach 1:
The hydraulic pump and motor operate periodically rather than continuously. The pressure accumulator stores pressurized fluid during pump operation and releases it during actuation cycles, allowing the prime mover to be switched off between cycles. This periodic operation significantly reduces noise emissions and energy consumption while maintaining pressure stability through the accumulator's buffer capacity.
4Speed
If the pump delivery volume is increased to achieve rapid traverse speeds, then traversal speed improves, but energy consumption and system complexity increase
Solution Approach 1:
The pressure accumulator is pre-charged with compressed gas and stores pressurized hydraulic fluid in advance. During rapid traverse operations, this pre-stored energy is released to achieve high speeds without requiring the pump to continuously deliver high volumes. This allows rapid traversal with low pump output, reducing energy consumption and 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
This solution results in high efficiency, reduced energy consumption, lower noise emissions, and a more compact, modular structure, enabling rapid traverse speeds with low pump output and minimizing environmental pollution.
Implementation Method 1
a rechargeable pressure accumulator by means of which a counterforce is caused by the working cylinder to compensate for the dead weight of the press beam
Implementation Method 2
a hydraulic pump and supply lines and control valves and a flow-connected, rechargeable pressure accumulator
Data Source
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AI summary
The invention relates to a drive device (1) for a press brake, in particular a bending press (2), comprising a press frame (3), a press table (9), and a press beam (11) adjustable relative to the press table (9) via a hydraulic system (18) with hydraulic pump (47), controllable drive motor (45), switching and control means, pressure lines, and at least one pressure cylinder (12) pressurised with pressure medium. The hydraulic system (18) forms a closed system with a ring line (44) comprising the hydraulic pump (47), control valves (39, 41, 58, 84, 86, 87, 88, 89), and a pressure accumulator (57). The ring line has a first line (51) between a pressure chamber (23) of the pressure cylinder (12) and the hydraulic pump (47) and a second line (53) between a further pressure chamber (22) of the pressure cylinder (12) and the hydraulic pump (47).The pressure accumulator (57) is selectively connected to the first line (51) or the second line (53) via at least one of the control valves (58, 84, 86) for receiving or releasing a storage volume of the pressure medium.