Continuous Prop Lifter for Coal Mine Support Pre-tightening
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Solution Overview
Problem
Existing prop lifting pre-tightening devices for mechanical constant-resistance single props are complex to operate and have poor stability due to the need for repeated removal and installation, limiting their effectiveness in applying pre-tightening force within the constraints of roadway support section height and cylinder piston rod extension length.
Innovation Solution
A continuous prop lifting pre-tightening device comprising a hydraulic oil cylinder, prop casing and rod clamping hoops, a pressurization system with manual or motor-driven pumps, and a monitoring unit, allowing for continuous prop lifting by controlling the piston rod extension and retraction to apply pre-tightening force efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If prop lifting pre-tightening devices are removed and installed repeatedly to apply pre-tightening force, then the pre-tightening force can be applied, but the operation becomes complex and stability deteriorates
Solution Approach 1:
The patent implements continuous prop lifting through a hydraulic system that maintains constant pressure, allowing the prop to be lifted continuously without repeated removal and installation of the device. The hydraulic oil cylinder provides sustained lifting force, and the oil supply pipeline ensures continuous oil flow, eliminating the need for repeated device reinstallation and improving operational simplicity and stability.
2Device complexity
If the section height of roadway support and extension length of cylinder piston rod are limited, then the device structure is compact, but the ability to apply pre-tightening force is restricted
Solution Approach 1:
The patent divides the lifting mechanism into modular components: the hydraulic oil cylinder for pressure generation, the oil supply pipeline for fluid transmission, and the prop lifting mechanism for force application. This segmentation allows each component to be optimized independently, maintaining compact overall structure while achieving effective pre-tightening force application within limited spatial constraints.
3Length of moving object
If prop lifting pre-tightening devices are designed for limited extension length, then the device fits within roadway constraints, but the lifting range and effectiveness are reduced
Solution Approach 1:
The patent employs a hydraulic system where hydraulic oil under pressure drives the oil cylinder to generate lifting force. The hydraulic mechanism amplifies the lifting capability, allowing the prop to be lifted beyond the simple mechanical extension limit of the piston rod through fluid pressure multiplication, thereby extending the effective lifting range while maintaining a compact device structure.
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
The device enables simple and stable continuous prop lifting, overcoming the limitations of previous systems by allowing multiple prop lifting operations and ensuring consistent pre-tightening force application, enhancing the supporting performance of single props in coal mine support.
Implementation Method 1
the piston rod of the hydraulic oil cylinder extends, the conical bush is squeezed and clutches the prop rod, so as to lift the prop rod of the single prop clamped by the two hoops
Implementation Method 2
the conical bush is squeezed and clutches the prop rod
Data Source
AI summary
A mechanical constant-resistance single prop continuous prop lifting pre-tightening device, structurally composed of a continuous prop lifting device, a pressurizing system, an oil supply line and a monitoring unit. The continuous prop lifting device is a core component, comprising a hydraulic cylinder, a prop barrel clamping sleeve ring and a prop rod clamping sleeve ring. The prop rod clamping sleeve ring is fixedly connected with a piston rod of the hydraulic cylinder by means of a cylinder head seat, and the prop barrel clamping sleeve ring is fixedly connected with a cylinder body of the hydraulic cylinder. With continuous pressurization of the pressurizing system, a cohesion occurs between the continuous prop lifting device and a prop rod, so that the prop rod of a single prop is lifted up to come into contact with a top plate and provide a pre-tightening force.