Percussion Apparatus Control Device Stroke Adjustment
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Solution Overview
Problem
The complexity and high cost of producing volumetric pumps in existing percussion hydraulic apparatuses make it challenging to create a simple and economical control device that can automatically adjust the striking stroke of the piston based on the hardness of the ground.
Innovation Solution
A control device with an adjusting slide that is actuated in synchronization with the control distributor, eliminating the need for a volumetric pump by using high-pressure fluid to adjust the striking stroke based on the hardness of the ground encountered, without requiring complex rectified slides and bores.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a volumetric pump is used to supply high-pressure fluid to the first control chamber, then the striking stroke can be automatically adjusted based on ground hardness, but the device complexity and production cost increase due to rectified slides and bores
Solution Approach 1:
The invention extracts and eliminates the volumetric pump from the system by using the existing high-pressure fluid supply circuit to directly supply fluid to the first control chamber through control channels that communicate with the piston cylinder during the reciprocating movement of the striking piston
Solution Approach 2:
The high-pressure fluid supply circuit serves multiple functions: it supplies fluid to the piston cylinder for the striking stroke and simultaneously supplies fluid to the first control chamber through control channels, eliminating the need for a separate volumetric pump
2Stress or pressure
If a volumetric pump with rectified slides and bores is implemented, then high-pressure fluid can be supplied to the first control chamber, but the production cost increases due to heavy and expensive parts
Solution Approach 1:
The invention extracts and eliminates the volumetric pump with its expensive rectified slides and bores, replacing it with a simpler system that uses existing high-pressure fluid supply circuits and control channels already present in the percussion apparatus
Solution Approach 2:
The system uses its own high-pressure fluid supply circuit to serve the dual purpose of actuating the striking piston and controlling the striking stroke length, making the system self-sufficient without requiring additional expensive components
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 automatic adaptation of the striking stroke length based on ground hardness, simplifying the apparatus structure and reducing production costs while maintaining effective operation.
Implementation Method 1
a control device arranged to vary the striking stroke of the striking piston depending on the hardness of the ground encountered by the tool, the control device comprising: a control cylinder, a plurality of control channels each opening into the control cylinder, each control channel also opening into the piston cylinder and being adapted to be put in communication with a high-pressure fluid supply circuit
Data Source
AI summary
This percussion apparatus includes a striking piston, a control distributor arranged to control a reciprocating movement of the striking piston, and a control device arranged to vary the striking stroke of the striking piston. The control device comprises a plurality of control channels, a control channel connected to the control distributor, a control slide movably mounted between a plurality of control positions, and an adjusting slide mounted in a receiving housing delimited by the control slide, the control slide and the adjusting slide delimiting a first adjusting chamber connected to the control channel and a second adjusting chamber connected to a the high-pressure fluid supply circuit. The control slide is movably mounted between a first position in which the first control chamber and the second adjusting chamber are connected and a second position in which the first control chamber and the second adjusting chamber are isolated.