Long Wall Hydraulic Supply System Pressure Control
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Solution Overview
Problem
Existing long wall hydraulic supply systems face challenges in maintaining a set pressure at powered roof supports due to varying operational demands, as the pump station's fixed pumping capacity struggles to adapt to changes in roof load and advancing operations.
Innovation Solution
A long wall hydraulic supply system with a remote pressure sensor and control unit that adjusts the pump station's operation in response to pressure signals, allowing for a varying volume of hydraulic fluid supply by controlling multiple pumping elements with variable speed drives and direct on-line drives, forming a negative feedback loop to maintain set point pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pump station operates with fixed pumping capacity, then the system structure is simple, but the ability to maintain set pressure under varying operational demands deteriorates
Solution Approach 1:
The pump station is transformed from a static fixed-capacity system to a dynamic variable-capacity system through the introduction of variable speed drives on multiple pump elements. The control unit dynamically adjusts the speed and operation of each pump element based on real-time pressure feedback from remote sensors, enabling the system to adapt its pumping capacity to match varying hydraulic demands while maintaining set pressure.
Solution Approach 2:
A feedback control loop is implemented using remote pressure sensors positioned at the powered roof supports that continuously monitor actual pressure and transmit signals to the control unit. The control unit compares measured pressure against target pressure setpoints and automatically adjusts pump station operation accordingly, creating a closed-loop system that maintains pressure stability despite varying operational conditions.
2Ease of manufacture
If the pump station is located remote from the face, then the system layout is simplified, but the speed of response to pressure changes at the powered roof support deteriorates
Solution Approach 1:
Remote pressure sensors are installed at or near the powered roof supports to provide real-time pressure feedback directly from the point of use. This enables the control unit to detect pressure changes at the source and immediately adjust pump station operation, compensating for the physical distance between the remote pump station and the face operations.
Solution Approach 2:
The system employs dynamic speed control of pump elements through variable speed drives, allowing rapid adjustment of hydraulic fluid delivery rate in response to real-time pressure demands. This dynamic response capability compensates for the time delay inherent in remote hydraulic supply, enabling the system to react quickly to changing operational conditions despite the physical separation between pump station and powered roof supports.
3Adaptability or versatility
If multiple pump elements are used with variable speed drives, then the flexibility of hydraulic fluid supply is improved, but the device complexity increases
Solution Approach 1:
The pump station is divided into multiple independent pump elements, each equipped with its own variable speed drive and controllable by the central control unit. This segmentation allows individual pump elements to be independently adjusted or taken offline, providing operational flexibility and the ability to match hydraulic supply to varying demand patterns while distributing the complexity across modular components.
Solution Approach 2:
The control unit serves multiple functions: it receives pressure feedback from remote sensors, processes pressure data against setpoint targets, determines required adjustments in hydraulic supply, and controls multiple variable speed drives on different pump elements. This multi-functional control system manages the complexity of multiple pump elements through a single intelligent controller, reducing overall system complexity while maintaining supply flexibility.
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 enables more accurate and flexible hydraulic fluid supply, improving the availability and speed of response at powered roof supports, enhancing mining operations by maintaining optimal pressure despite varying demands.
Implementation Method 1
a remote pressure sensor located remote from the pump station in the hydraulic line
Implementation Method 2
a pump station operatively coupled to a remote powered roof support to supply hydraulic fluid thereto via a hydraulic line
Implementation Method 3
controlling operation of one or more pumps in the pump station
Implementation Method 4
forming a negative feedback loop to maintain set point pressure
Data Source
Figure 1~4
AI summary
A long wall hydraulic supply system and related control unit, method and computer program product are provided. The long wall hydraulic supply system comprises a pump station (12) operatively coupled to remote powered roof supports (20) to supply hydraulic pressure thereto via a hydraulic line (30). The system also comprises a remote pressure sensor (40) located at a position remote from the pump station, and a control unit (50). The control unit is operatively coupled to the remote pressure sensor (40) and to the pump station (12), and is arranged to control the pump station to supply hydraulic fluid to the powered roof support via the hydraulic line (30) in response to a remote pressure signal received from the remote pressure sensor (40). By using a remote pressure sensor, pump station control can be improved.