Percussion Device Damping Cushion Valve Speed

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Solution Overview

Problem

Existing pressure-fluid-operated percussion devices face inefficiencies in valve position change speed and efficiency, with external pressure control causing slow valve movement and forced control resulting in high final speed at extreme positions, and pressure fluid flowing directly into a tank, decreasing overall efficiency.

Innovation Solution

Incorporating an annular surface at the rear end of the percussion piston and a corresponding annular surface on the control valve, which aligns to throttle pressure fluid flow, allowing pressure to rise quickly and decelerate the piston's reverse stroke, while the control valve moves swiftly to a new position, and providing a damping effect without a separate cushion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If external pressure control is used to move the control valve, then the valve position can be changed, but the valve moves slowly from one position to another

Engineering Contradiction:

Improvevalve movement speedVSAvoidpercussion operation efficiency

Core Design Contradiction:

SpeedVSProductivity

Solution Approach 1:

The patent introduces a damping cushion as an intermediary element between the percussion piston and the control valve. This cushion mediates the pressure transmission, allowing the control valve to respond more quickly to position changes while maintaining controlled movement. The cushion acts as a buffer that transmits pressure changes more rapidly than direct fluid coupling would allow.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the physical parameters of the pressure fluid system by introducing a compressible damping cushion. This cushion alters the pressure transmission characteristics, enabling faster valve response times. The cushion's compressibility allows it to absorb and release pressure rapidly, accelerating valve movement compared to incompressible fluid coupling.

Inventive Principle:

Principle #35Parameter changes

2Speed

If forced control is used to move the control valve, then the valve position changes fast, but the valve has a high final speed in both extreme positions of its movement

Engineering Contradiction:

Improvevalve position change speedVSAvoidvalve movement control

Core Design Contradiction:

SpeedVSEase of operation

Solution Approach 1:

The patent employs beforehand cushioning by positioning the damping cushion to engage before the control valve reaches its extreme positions. This cushioning effect slows the valve down as it approaches the ends of its travel, preventing high final speeds and reducing impact. The cushion is pre-positioned to provide deceleration exactly when needed, improving control and reducing mechanical stress.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Productivity

If pressure fluid flows directly into a tank, then the system is simple, but the efficiency of the percussion device decreases

Engineering Contradiction:

Improvepercussion device efficiencyVSAvoidpressure fluid energy loss

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent extracts the pressure fluid from the direct path to the tank by routing it through the damping cushion first. This extraction allows the fluid to perform useful work (damping and pressure regulation) before being discharged. The pressure fluid is taken out of the simple discharge path and redirected through a functional element that improves overall system efficiency while maintaining system simplicity.

Inventive Principle:

Principle #2Taking out (Extraction)

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 enhances the efficiency of the percussion device by directing pressure fluid into a work space rather than a container, improving valve speed control and providing damping without additional components.

Implementation Method 1

as the annular surfaces are aligned they substantially throttle the pressure fluid flow between the percussion piston and the control valve

Methodology Applied

Scientific EffectPressure fluid flow throttling:

Implementation Method 2

as pressure is acting on the surfaces on the side of the second pressure fluid space of the control valve it makes the control valve move towards the front end of the percussion device

Methodology Applied

Scientific EffectPressure-driven movement: Pressure Gradient

Implementation Method 3

the pressure in the second pressure fluid space rises decelerating the reverse stroke of the percussion piston

Methodology Applied

Scientific EffectDamping: Damping

Data Source

PatentUS8800425B2Percussion device

Publication Date: 2014.08.12 SANDVIK MINING & CONSTR OY

AI summary

The invention relates to a percussion device having a body and a percussion piston moving therein, pressure fluid spaces in the rear and front ends of the percussion piston and pressure fluid channels for feeding pressure fluid into the percussion device. The percussion piston and the control valve comprise surfaces, which, when aligned, substantially close the pressure fluid flow from the pressure fluid space locating behind the percussion piston in front of the control valve, whereby the produced pressure displaces the control valve to another position.