Reach Forklift Chassis Locking Device Rigidity Control
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Solution Overview
Problem
Existing reach forklift trucks face safety issues due to increased shaking and tipping during hydraulic operations and turning, primarily attributed to the suspension system's design, which compromises comfort and stability.
Innovation Solution
A reach forklift truck chassis with a locking device that adjusts the connection rigidity between the auxiliary wheel and the vehicle body, using a drive wheel compression spring and an auxiliary wheel compression spring to absorb shocks and stabilize the vehicle, while a solenoid valve and locking oil cylinder control the locking device's operation to enhance safety and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If springs are arranged between drive wheel and vehicle body and between auxiliary wheel and vehicle body to buffer and absorb shock, then comfort of operation is improved, but vehicle shakes more seriously and is more likely to tip over during hydraulic operation and turning
Solution Approach 1:
The patent applies a locking device that can dynamically change the connection state between the auxiliary wheel bracket and vehicle body from rigid to elastic (via first rotary shaft) based on operational conditions. This dynamic adjustment allows the system to adapt between stability requirements (during turning/hydraulic operation) and comfort requirements (during normal travel), resolving the contradiction between operation safety and comfort.
Solution Approach 2:
The locking device changes the rigidity parameter of the auxiliary wheel bracket connection by switching between locked (rigid) and unlocked (elastic) states. This parameter change allows the system to maintain high rigidity during critical operations to prevent tipping, while allowing flexibility during normal operations for comfort, thus resolving the contradiction between safety and comfort.
2Reliability
If a locking device is added to control the first rotary shaft to be rigidly or rotationally connected to the auxiliary wheel bracket, then operation safety is improved, but device complexity increases
Solution Approach 1:
The locking device uses a locking oil cylinder with solenoid valve control to achieve rigid/elastic connection switching. This hydraulic/pneumatic actuation method provides reliable locking force with compact structure, and the solenoid valve enables automatic control based on operational conditions, improving safety while keeping the added complexity manageable through efficient actuation mechanisms.
3Ease of operation
If auxiliary wheel compression spring presses the auxiliary wheel bracket up and presses down the drive wheel bracket, then shock absorption is improved, but vehicle stability during turning and hydraulic operation deteriorates
Solution Approach 1:
The system dynamically adjusts the rigidity of the auxiliary wheel bracket connection through the locking device. During turning and hydraulic operation, the locking device engages to provide rigid connection and enhance stability. During normal travel, the locking device disengages allowing the auxiliary wheel compression spring to provide elastic shock absorption, thus resolving the contradiction between stability and shock absorption.
Solution Approach 2:
The locking device is designed to engage in advance before critical operations (turning, hydraulic operation) occur, proactively establishing the rigid connection needed for stability. This preliminary action prevents the instability issue before it arises, while allowing shock absorption during non-critical phases.
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 effectively improves the operation safety and stability of the reach forklift truck by reducing shaking and the likelihood of tipping during hydraulic operations and turning, while allowing for adjustable rigidity to balance comfort and stability.
Implementation Method 1
An auxiliary wheel compression spring is connected between a second end of the auxiliary wheel bracket and the drive wheel bracket, and after compression deformation, the auxiliary wheel compression spring presses the auxiliary wheel bracket up and presses down the drive wheel bracket
Implementation Method 2
A locking device is provided at the first end of the auxiliary wheel bracket, and the locking device is configured to control the first rotary shaft to be rigidly or rotationally connected to the auxiliary wheel bracket
Implementation Method 3
The locking device includes a locking oil cylinder and a solenoid valve provided on the locking oil cylinder to control an oil passage of the locking oil cylinder. The solenoid valve is electrically connected to the output end of the controller, and the solenoid valve correspondingly controls locking or floating of the locking oil cylinder by controlling on-off of the solenoid valve
Data Source
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AI summary
A reach forklift truck chassis and a reach forklift truck are provided according to the present application. The reach forklift truck chassis includes a drive wheel bracket, an auxiliary wheel bracket, a drive wheel and an auxiliary wheel. A drive wheel compression spring is connected to an upper side of the drive wheel bracket. A middle part of the auxiliary wheel bracket is hinged to a first rotary shaft. A locking device is provided at a first end of the auxiliary wheel bracket, and the locking device is configured to control the first rotary shaft to be rigidly or rotationally connected to the auxiliary wheel bracket. An auxiliary wheel compression spring is connected between a second end of the auxiliary wheel bracket and the drive wheel bracket, and after compression deformation, the auxiliary wheel compression spring presses the auxiliary wheel bracket up and presses down the drive wheel bracket, and an input end of the locking device is electrically connected with an output end of the controller. By adding a locking device, the connection rigidity between the auxiliary wheel and the vehicle body and the connection rigidity between the auxiliary wheel bracket and the vehicle body can be adjusted, thereby adjusting the overall rigidity of the vehicle, which can effectively improve the safety of the vehicle, balance the advantages of rigid suspension and elastic suspension, and improve comfort and stability.