Hydraulic Jack Load Display via Arm Strain Gauge
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Solution Overview
Problem
Hydraulic jacks lack effective load and overload warning systems, leading to potential overloading and safety issues due to unclear load limits, and existing solutions complicate machining and increase the risk of oil leakage.
Innovation Solution
A hydraulic jack design featuring a signal collection assembly on the lifting arm electrically connected to a weighing controller, which displays load on an LCD and provides overload warnings without communicating with the oil circuit, thus avoiding leakage and simplifying installation and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a pressure gauge is connected to the oil circuit to display load, then load can be displayed, but the risk of oil leakage increases
Solution Approach 1:
The patent replaces the mechanical pressure gauge connection system with an electronic sensing system. A strain gauge (electrical sensor) is installed on the lifting arm to detect load, and the signal is transmitted wirelessly or through wires to a display device, eliminating the need for mechanical connections to the hydraulic oil circuit and thus preventing oil leakage risks.
Solution Approach 2:
The patent introduces an intermediary electronic sensing mechanism (strain gauge) that indirectly measures load without direct contact with the hydraulic oil circuit. The strain gauge converts mechanical deformation into electrical signals, which are then processed and displayed, serving as a mediator between the mechanical lifting system and the information display system.
2Measurement precision
If a pressure gauge interface is arranged on the base to communicate with the oil circuit, then load can be measured, but the machining work and device complexity increase
Solution Approach 1:
The patent extracts the load sensing function from the base structure and relocates it to the lifting arm where the actual lifting force is applied. The strain gauge is mounted directly on the lifting arm, simplifying the base structure and reducing machining complexity while maintaining accurate load measurement capability.
Solution Approach 2:
The patent applies the sensing function locally at the point of maximum stress (the lifting arm) rather than requiring a complex interface on the base. The strain gauge is positioned where it can directly measure the bending moment caused by the load, providing accurate measurement with minimal structural modification.
3Loss of information
If the pressure gauge is positioned to communicate with the oil circuit, then load can be displayed, but the viewing angle affects reading accuracy
Solution Approach 1:
The patent replaces the analog pressure gauge with a digital display system that shows load information electronically. The strain gauge converts mechanical load into electrical signals that are processed and displayed as numerical values on an LCD or LED display, eliminating perspective distortion and providing accurate readings from any viewing angle.
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 solution allows for accurate load reading from any position and prevents oil leakage, enhancing safety and operational efficiency by providing clear load and overload warnings without compromising the hydraulic jack's integrity.
Implementation Method 1
a strain gauge 64 is arranged in a first strain gauge slot 632 around the through-hole 631 at a side where the strain gauge base 63 faces the tray 5, so that the strain gauge 64 contacts the tray 5
Data Source
AI summary
A hydraulic jack capable of displaying load and overload warning, belonging to the technical field of hydraulic lifting equipment. It comprises: a base, a lifting arm, a pump body, a handle, and a tray, wherein, a signal collection assembly designed to sense the load on the tray is arranged at the end of the lifting arm, and the signal collection assembly is electrically connected to a weighing controller arranged on either the base or the pump body, and the tray is arranged on the signal collection assembly. Since a signal collection assembly designed to sense the load on the tray is arranged at the end of the lifting arm and electrically connected to the weighing controller, the load sensing method by the aid of communication with the oil circuit in the prior art is abandoned and the leakage of hydraulic oil can be avoided; since the signal collection assembly is arranged at the end of the lifting arm, the entire assembly can be easily processed, installed, and maintained.