Hydraulic Jack Dual Pump System for Rapid Light Load Lifting
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Solution Overview
Problem
Existing hydraulic jacks are inefficient and time-consuming when lifting light loads, as they rely solely on the small pump, resulting in slow jacking speed and long travel times.
Innovation Solution
The hydraulic jack incorporates a dual pump system with pressure regulation mechanisms, allowing the large pump to assist the small pump by adjusting pressures to match under light load conditions, enabling rapid lifting by balancing the preload of both pumps and ensuring the small pump operates efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If only the small pump works under light load condition, then the jack can lift the load, but the jacking speed is slow and the travel time is long
Solution Approach 1:
The patent merges the functions of the large pump and small pump to work simultaneously under light load conditions. The large pump core and small pump core both connect to the hand press and can operate together to supply hydraulic oil to the cylinder, combining their output to achieve faster lifting speed while maintaining the ability to handle light loads efficiently.
2Speed
If the large pump works under no-load condition, then the lifting speed is fast, but the pressure regulating valve must be adjusted to low pressure
Solution Approach 1:
The patent implements dynamic pressure regulation by allowing the system to automatically adjust which pump operates based on the load condition. Under no-load conditions, the large pump operates at low pressure for fast lifting; under light load, both pumps operate at balanced pressure; under heavy load, only the small pump operates at high pressure. This dynamic switching eliminates the need for manual pressure regulation adjustments.
Solution Approach 2:
The system changes operational parameters (which pump operates, at what pressure) based on the load condition. The large pump core and small pump core can operate individually or together, with their pressure outputs dynamically adjusted through the pressure regulation mechanisms to match the required lifting conditions, optimizing both speed and pressure efficiency.
3Productivity
If the large pump assists under light load condition, then the lifting speed increases, but the system complexity increases with dual pressure regulation mechanisms
Solution Approach 1:
The patent designs the large pump core and small pump core with universal functionality to the hand press, allowing either pump or both pumps to operate depending on the load condition. The pressure regulation mechanisms are designed to work with either pump, creating a multi-functional system that can adapt to different operating conditions without requiring completely separate systems for different load types.
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 configuration allows for rapid lifting of light loads while protecting the jack's components from overload, enhancing efficiency and reducing the risk of deformation.
Implementation Method 1
a large pump core and a small pump core are axially connected to the hand press respectively, and top surfaces of the large pump core and that of the small pump core are in contact with rollers mounted on the hand press respectively; wherein the inner cavity of the large pump is in communication with a first pressure regulation mechanism, and the inner cavity of the small pump is in communication with a second pressure regulation mechanism
Data Source
AI summary
A hydraulic jack capable of quickly lifting a load includes a frame (1) mounted with a lifting arm (2), a long connecting rod, a tray (4), a bracket and a hydraulic oil pump (3) for driving the lifting arm (2), and further includes a large pump (11) and a small pump (12) for supplying high pressure oil to the hydraulic oil pump (3). An inner cavity of the large pump (1) and a small pump core are axially connected to a hand press (8) respectively. The inner cavity of the large pump (11) is in communication with a first pressure regulation mechanism (9), and the inner cavity of the small pump (12) is in communication with a second pressure regulation mechanism (10). The first pressure regulation mechanism (9) comprise a first upper valve body (90) mounted on a lower valve body (33), a first oil outlet (91) of a communicating oil compartment (32) provided on a side wall thereof, and a first oil inlet (92) provided at a bottom thereof, the first oil inlet (92) being in communication with the inner cavity of the large of the large pump (11). A central hole of the first upper valve body (90) is sequentially provided from bottom to top with a first lower steel ball (93) capable of blocking the first oil inlet (92), a first ball valve base (94), a first pressure spring (95), a first valve core (96) and a first valve rod (97), the first pressure spring (95) being disposed between the first ball valve base (94) and the first valve core (96). The second pressure regulation mechanism (10) and the first pressure regulation mechanism (9) have the same structure.