Fluid Clamp Apparatus Force Multiplication Mechanism
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Solution Overview
Problem
Existing clamp apparatuses that employ fluid pressure for clamping force multiplication are either bulky due to increased pressure reception area or experience delayed operation and excessive force on the force multiplication mechanism during clamping release, as the second force generated by fluid pressure on the second piston is not optimally multiplied and the first piston is biased by a spring.
Innovation Solution
A clamp apparatus with a vertically partitioning piston member, a force multiplication mechanism that multiplies fluid pressure force, and a link mechanism that links the output rod and piston member during unclamping, allowing efficient force transmission and preventing excessive force on the mechanism, featuring a tubular portion with spheres, conical surfaces, and a link pin for reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the pressure reception area of the piston member is increased to strengthen clamping force, then the clamping force is improved, but the clamp apparatus increases in size
Solution Approach 1:
A force multiplication mechanism is introduced as an intermediary between the piston member and the output rod. This mechanism includes a first piston receiving fluid pressure, a second piston with larger area receiving force from the first piston, and a lever mechanism that multiplies the force to amplify the clamping force applied to the workpiece without requiring the main piston to have a large pressure reception area
Solution Approach 2:
The force multiplication mechanism utilizes spatial arrangement and mechanical leverage in multiple dimensions. The first piston, second piston, and lever mechanism are arranged in a compact three-dimensional configuration that achieves force multiplication through mechanical advantage rather than simply increasing the piston area, thereby maintaining a compact apparatus size while achieving high clamping force
2Power
If the first piston is made tubular to allow fluid pressure operation on the second piston, then force transmission is improved, but the pressure reception area becomes small causing delayed piston operation
Solution Approach 1:
The fluid pressure is supplied to both the first piston and the second piston simultaneously through separate fluid supply paths. This preliminary action ensures that both pistons begin moving at the same time, preventing the delay that would occur if the second piston had to wait for the first piston to complete its stroke before receiving pressure
Solution Approach 2:
The piston system is segmented into a first piston and a second piston that operate independently but cooperatively. The first piston is tubular and receives fluid pressure to drive the second piston, while the second piston has its own fluid pressure supply that allows it to operate simultaneously, dividing the force transmission function into two parallel paths that eliminate operational delay
3Device complexity
If the second piston is formed integrally with the output rod to transmit force directly, then the structure is simplified, but the second force is not multiplied causing suboptimal clamping force
Solution Approach 1:
The force multiplication mechanism acts as an intermediary between the piston system and the output rod. The second piston is formed integrally with the output rod for structural simplicity, but the force multiplication mechanism (first piston, second piston, and lever) is inserted as an intermediary to multiply the force before it reaches the output rod, achieving both structural simplicity and force amplification
4Stability of the object's composition
If a compression spring biases the first piston in the clamping direction, then clamping force maintenance is improved, but during clamping release the piston lowering is delayed causing excessive force on the mechanism
Solution Approach 1:
During the clamping release operation, fluid pressure is supplied to the second piston in advance to create an upward biasing force that counteracts the compression spring force. This preliminary action ensures that the first piston can lower smoothly without delay, preventing excessive force from acting on the force multiplication mechanism during the release stroke
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 design strengthens clamping force, allows for a more compact apparatus, and prevents unreasonable force on the force multiplication mechanism during unclamping, ensuring smooth operation and reliable clamping and release.
Implementation Method 1
a force acting on the piston member due to fluid pressure in the first fluid pressure operation chamber
Implementation Method 2
a force multiplication mechanism which multiplies force generated by fluid pressure acting on the first piston and transfers the result to the second piston
Implementation Method 3
there is provided a compression spring for maintaining clamping force to bias the first piston in the direction for clamping operation
Data Source
AI summary
The fluid clamp apparatus includes: a sliding piston member that vertically partitions its cylinder bore; first and second fluid pressure operation chambers; a fluid passage that, during an upward light-load stroke of the piston member, causes the back pressure in the second fluid pressure operation chamber to be received by the output rod to advance the output rod; a force multiplying mechanism that, during a heavy-load stroke of the piston member, multiplies the force acting on the piston member and transmits this force to the output rod; and a link mechanism that, during unclamping lowering operation of the piston member, links together the output rod and the piston member after lowering by a predetermined stroke amount.