Pantograph Valve Arrangement for Wear Control
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Solution Overview
Problem
Current collectors for road vehicles face challenges in optimizing both wiring and unwiring processes, which are dynamic and subject to wear, and require quick disconnection to avoid damage, while also minimizing interruptions in energy transmission.
Innovation Solution
A current collector with a central valve arrangement that adjusts supply air and exhaust air flow through throttle valves, linked to the lifting drive and support linkage, allowing for adjustable cross-sections to control the lifting and lowering speed, enabling fast and low-wear operations without external energy or electronic control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pantograph disconnects as quickly as possible to avoid damage during emergency situations, then the safety and reliability are improved, but wear and tear from chipping on and from the contact strips increases due to rapid reconnection
Solution Approach 1:
The pneumatic valve system dynamically adjusts air flow resistance based on the pantograph's vertical position. During rapid disconnect, the valve provides minimal resistance for fast descent. During reconnect, the valve progressively increases resistance as the pantograph approaches the contact position, enabling controlled acceleration and deceleration that reduces impact and wear while maintaining safety.
Solution Approach 2:
The system changes the pneumatic resistance parameter throughout the motion cycle. The valve's variable opening cross-section modifies the air flow characteristics, transitioning from high-flow low-resistance state during emergency disconnect to controlled-flow high-resistance state during reconnect, optimizing both safety and wear prevention.
2Object-generated harmful factors
If slower wiring is used to reduce wear during reconnection, then the wear and tear is reduced, but the usable length of the connected overhead line is reduced
Solution Approach 1:
The pneumatic valve creates a dynamic reconnection process where the resistance profile is optimized for each phase of motion. The variable flow resistance allows the system to achieve both rapid initial connection and controlled final approach, maintaining high productivity while minimizing wear at the critical contact moment.
3Adaptability or versatility
If additional wiring and disconnection processes occur when entering and exiting electrified sections, then the adaptability to different track configurations is improved, but the number of wear-critical operations increases
Solution Approach 1:
The pneumatic valve system automatically adapts to different operational scenarios without external control. Whether during initial connection, reconnection, or frequent wiring/unwiring operations, the valve self-regulates the air flow based on position, minimizing wear for each operation type while maintaining full adaptability to various track configurations.
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 allows for rapid and material-friendly unwiring and wiring processes, reducing wear and minimizing energy transmission interruptions, while being inherently robust against electronic errors and not requiring separate safety classifications.
Implementation Method 1
The lifting device comprises a pneumatic lifting drive, which is supplied by a supply air flow from a compressed air source, wherein the lifting speed of the contact strips is controlled by a pneumatic valve for the supply air flow.
Implementation Method 2
Exhaust air from the air reservoir is released into the environment via a throttle valve.
Data Source
Figure 1
Figure 2~4
Figure 5~8
AI summary
The invention relates to a pantograph (2) for an electrically or hybrid-electrically powered road vehicle (1) for supplying electrical traction energy from a two-pole overhead contact line system, each contact pole having a contact wire (3). It comprises an articulated support frame (4) which carries rocker assemblies (7) with contact strips (8) on the contact wire side. A pneumatic lifting drive (12) is coupled to the support frame (4) such that the rocker assemblies (7) can be raised from a lower storage position (hA) to an upper contact position (hK) when the lifting drive (12) is pressurized, and lowered back to the storage position (hA) by their own weight when the pressure is released. The lifting drive (12) can be connected to a compressed air supply (15) via an air supply line (18) for pressurization and to the environment via an exhaust air line (16) for pressure release.According to the invention, a valve arrangement (20) is provided with an air supply throttle (21) connected in the supply air line (18) and an exhaust air throttle (22) connected in the exhaust air line (16), wherein the air supply throttle (21) has an adjustable inlet cross-section by means of an actuating element (23) and the exhaust air throttle (22) has an adjustable outlet cross-section by means of an actuating element (23). The actuating elements (23) are operatively connected to the lifting drive (20) and/or the support linkage (4) such that the inlet cross-section when raising the rocker assemblies (7) and the outlet cross-section when lowering the rocker assemblies (7) are adjustable depending on a vertical position (h) of the rocker assemblies (7). This enables both low-wear wire-on and material-friendly wire-off in a short time.