Hydraulic Impact Device Warm-Up With Accumulator Pressure Limiting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing heating arrangements for hydraulic impact devices in rock drilling machines are inefficient and can cause damage to membranes and seals due to high hydraulic pressures during warm-up in low-temperature conditions, leading to reduced durability and increased maintenance.
Innovation Solution
A selective warm-up mode is implemented using a control element to limit the feeding of pre-heated hydraulic fluid to the impact device, ensuring pressures remain below the pre-charge pressure of the pressure accumulators, thereby preventing movement of separating elements and reducing stress on membranes and seals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If pre-heated hydraulic fluid is fed to the impact device during warm-up, then the hydraulic system is heated, but high pressure causes compression and volume change in the gas space of pressure accumulators, leading to membrane movement and potential breakage
Solution Approach 1:
The patent changes the pressure parameter during warm-up by limiting it to remain below the pre-charge pressure of the pressure accumulators. This is achieved through a control element that restricts hydraulic fluid flow, ensuring pressure stays in a safe range that prevents membrane compression and movement while still allowing thermal heating of the hydraulic system.
2Productivity
If high hydraulic pressure is applied during warm-up, then heating efficiency is improved, but stresses and wear on sealings and membranes increase, reducing their operating life
Solution Approach 1:
The patent applies partial action by providing only the necessary amount of hydraulic pressure during warm-up - enough to heat the system effectively but not excessive enough to cause damage. The control element limits pressure to remain below pre-charge pressure, delivering just sufficient hydraulic power for warming while avoiding harmful stresses on sealings and membranes.
3Reliability
If hydraulic fluid flow is limited during warm-up, then pressure on accumulators is reduced, but warm-up time increases
Solution Approach 1:
The patent maintains continuous useful action by keeping the hydraulic system in operation during warm-up with controlled flow through the control element. Rather than stopping circulation to protect components, the system continues to circulate hydraulic fluid at limited pressure, providing continuous heating while protecting accumulators and sealings from damage.
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 approach extends the operating life of membranes and seals by avoiding damage, decreases maintenance costs, and maintains the integrity of hydraulic components during low-temperature operation.
Implementation Method 1
The control element limits the feeding of the pre-heated hydraulic fluid in the feed channel so that pressure is below a first pre-charge pressure of a first pressure accumulator
Implementation Method 2
a hydraulic impact device of a rock treating machine is pre-heated with a heating arrangement for use in low-temperature operating conditions
Data Source
AI summary
An arrangement and method for heating an impact device of a rock treating machine (Rtm) in low-temperature operating conditions is provided. The arrangement includes a warm-up mode (WM) for feeding pre-heated hydraulic fluid through a feed channel to a hydraulic circuit of the impact device. One or more hydraulic accumulators are provided in the hydraulic circuit. The feed channel is provided with a control element for limiting the feeding of the pre-heated hydraulic fluid during the warm-up mode. The control element limits the feeding of the pre-heated hydraulic fluid in the feed channel so that separating elements of the pressure accumulators do not move.