Gate With Counterweight And Exchangeable Span
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Solution Overview
Problem
Existing gate systems that lower into a cavity face challenges such as limited space requirements, protruding guide posts, restricted lifting force due to actuator constraints, and complex maintenance and customization, particularly for larger or tailor-made spans.
Innovation Solution
A gate system featuring a reinforced concrete pit with an exchangeable span connected by catches to a load-bearing beam, silent self-adjusting rollers, counterweights with infinite adjustment, and a safe worm drive system, eliminating above-ground guides and allowing for precise weight adjustment and easy maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If guide posts protrude above ground level to support the span, then the span can be properly guided and stabilized, but the gate becomes visually obtrusive and requires more space above ground level
Solution Approach 1:
The guide posts are extracted from above-ground position and relocated entirely below ground level into the pit. The rollers that provide guidance and stabilization are now housed within the pit structure, eliminating the need for visible above-ground guide posts while maintaining their functional purpose.
Solution Approach 2:
The guidance system transitions from a vertical above-ground configuration to a horizontal below-ground configuration. The rollers operate within the horizontal plane of the pit, changing the spatial dimension where the guidance function is performed from above-ground to below-ground level.
2Area of stationary object
If actuators are installed in limited space above ground level, then the gate structure remains compact, but the lifting force is restricted and cannot handle very large span masses
Solution Approach 1:
A counterweight system is introduced that balances the span mass, reducing the net lifting force required from the actuators. The counterweight compensates for the heavy span mass, allowing standard actuators to lift much heavier loads than they could alone, while maintaining compact above-ground space requirements.
Solution Approach 2:
The lifting system is segmented into multiple components: the counterweight mechanism, the rope-slings, and the actuators. This segmentation allows the heavy lifting task to be distributed across multiple elements, with the counterweight handling the majority of the mass and actuators providing controlled movement, enabling high lifting force within limited space.
3Device complexity
If the gate uses a traditional actuator system for lifting, then the structure can be simpler, but the operation speed is slower and emergency operation without heavy equipment is difficult
Solution Approach 1:
The gate operation uses periodic action through the worm drive mechanism that provides controlled, step-by-step movement. The system operates in distinct phases: powered lifting/closing at normal speed, and manual crank operation for emergency situations. This periodic operation pattern allows for both efficient normal operation and rapid emergency response.
Solution Approach 2:
The worm drive acts as an intermediary between the actuator and the span, providing mechanical advantage and controlled movement. The manual crank handle serves as an intermediary tool that allows emergency operation without requiring heavy lifting equipment, translating human effort into effective gate movement through the worm drive mechanism.
4Device complexity
If the gate span is fixed and non-exchangeable, then the installation structure can be simpler, but customization to individual taste and future changes become very complicated
Solution Approach 1:
The gate system is segmented into exchangeable spans and a permanent supporting structure. The spans can be removed and replaced independently through the catch mechanisms, while the load-bearing beam, pit structure, and guide rails remain fixed. This segmentation enables easy customization without requiring changes to the fundamental installation structure.
Solution Approach 2:
The system transitions from a static, fixed span configuration to a dynamic, exchangeable span system. The catches and load-bearing beam create a reversible connection that allows spans to be easily installed and removed, enabling the structure to adapt to different customization requirements while maintaining structural integrity.
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
Enables flexible span configurations, rapid operation, and safe, efficient opening/closing with reduced maintenance needs, suitable for various applications including pedestrian access and industrial settings, with enhanced safety features and silent operation.
Implementation Method 1
a safe worm drive system
Implementation Method 2
a counterweight with a infinitely adjustable weight
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The gate has an exchangeable span (4) that is fixed to the load bearing beam (3) and is connected with pulley bearings (11) and rope-slings (12) to the system of adjustable counterweights (9). The drive system is fitted with an electric drive (19) with a worm-wheel (24) mounted to the load bearing beam (3) that travels vertically along the worm (22). The beam, span and the drive travel on adjustable guiderails (2) inside a reinforced concrete pit (1) in the direction opposite to that of counterweights (9). The load bearing beam (3) is fitted with rollers (5) and retaining rollers mounted to the cover (18). Emergency (manual) operation of the gate is possible by turning a crank handle connected with the worm (22), having released the lock that prevents the worm from rotating on its axis.