Boom-Adjustable Hydraulic Jack with Pull-Lock Mechanism
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Solution Overview
Problem
Existing horizontal hydraulic jacks have fixed lifting height and load capacity due to fixed oil pressure and stroke parameters, limiting their applicability and requiring cumbersome switching between boom positions.
Innovation Solution
A boom-adjustable horizontal hydraulic jack with a pull-lock mechanism, featuring a bearer carrier with bosses, pin shafts, dialing plates, and a steel rope system, allowing quick and safe switching between folded and normal positions by tensioning the steel rope and engaging/disengaging locking pins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the boom length is fixed to maintain structural simplicity, then the device complexity is reduced, but the adaptability for different lifting heights and load capacities is limited
Solution Approach 1:
The boom is designed as an adjustable component that can change its effective length between folded and normal positions. The pull-lock mechanism enables dynamic reconfiguration of the boom assembly, allowing the hydraulic jack to adapt to different lifting requirements while maintaining a relatively simple overall structure.
Solution Approach 2:
The boom assembly is segmented into movable and fixed portions, with the bearer and foreman capable of relative movement. The pull-lock mechanism divides the locking function into discrete locking pins that can independently secure the boom in different positions, enabling flexible adjustment without complex overall restructuring.
2Adaptability or versatility
If a fixing pin mechanism is used to switch between folded and normal positions, then the adaptability is improved, but the ease of operation deteriorates due to troublesome switching
Solution Approach 1:
The traditional manual fixing pin mechanism is replaced with a pull-lock mechanism that uses a steel cable connected to a ratchet and pawl system. This mechanical substitution allows the boom position to be changed by simply pulling a handle, which activates the ratchet mechanism to securely lock the boom in the desired position, greatly simplifying the operation compared to manually inserting and securing fixing pins.
Solution Approach 2:
The steel cable acts as an intermediary between the operator's pulling action and the locking mechanism. When the handle is pulled, the cable transmits the force through the ratchet and pawl system to engage or disengage the locking pins, providing a smooth and convenient interface for position switching without requiring direct manipulation of the locking components.
3Ease of manufacture
If the boom structure is simplified to reduce device complexity, then the ease of manufacture is improved, but the reliability of position locking may deteriorate
Solution Approach 1:
The ratchet and pawl mechanism incorporates a spring-loaded safety feature that ensures the locking pins are always under sufficient compressive force to maintain secure engagement. The spring pre-tensioning compensates for any wear or dimensional variations in the locking components, ensuring reliable position locking without requiring overly complex or precision-manufactured parts.
Solution Approach 2:
The locking mechanism utilizes friction and mechanical advantage through the ratchet teeth geometry to transform a simple pulling motion into a secure locked position. By carefully designing the ratchet tooth angles and pawl engagement parameters, the system achieves high reliability in position locking while maintaining simple manufacturing requirements for the individual components.
Data Source
AI summary
A boom-adjustable horizontal hydraulic jack with a pull-lock mechanism belongs to a lifting apparatus. The jack comprises a chassis, a hydraulic assembly, a press handle, a boom assembly, and a link rod assembly, wherein, the boom assembly comprises a bearer, a forearm, and a rear arm; the link rod assembly comprises a first link rod and a second link rod; wherein, a pull-lock mechanism is additionally arranged on the bearer, and comprises a guide rod seat, a guide rod, a pull handle, a guide sleeve, a steel rope, a dialing plate shaft, and a locking pin shaft.