Parking Brake Control Device for Mining Vehicles
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Solution Overview
Problem
The silting phenomenon in parking brake systems of mining machines causes sticking issues due to dust accumulation, leading to brake failure, as existing solutions are not specifically designed for continuous operation in harsh environments and prioritize noise reduction over brake integrity.
Innovation Solution
A parking brake control device with a control unit that determines vehicle stoppage through speed, hydraulic pressure, and actuation switch inputs, automatically actuating and releasing the brake to prevent dust accumulation and minimize wear, featuring a non-actuation time measurement to optimize brake engagement and disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the parking brake is actuated during vehicle traveling, then the brake can be engaged to stop the vehicle, but the brake components may break due to excessive stress
Solution Approach 1:
The control unit preliminarily determines whether the vehicle is stopped before actuating the parking brake. By checking vehicle stoppage status in advance, the system prevents engagement during traveling, avoiding excessive stress on brake components while ensuring reliable engagement when appropriate
Solution Approach 2:
The control unit continuously monitors vehicle traveling status and provides feedback to the parking brake control logic. This feedback mechanism ensures the brake is only actuated when the vehicle is confirmed to be stopped, preventing premature engagement that would cause component breakage
2Stability of the object's composition
If the spool remains stationary for long periods, then the hydraulic system remains stable, but dust accumulates between the spool and valve main body causing sticking
Solution Approach 1:
The control unit implements periodic actuation of the parking brake at predetermined intervals during continuous operation. This periodic movement of the spool prevents dust accumulation and sticking while maintaining hydraulic system stability between actuations
Solution Approach 2:
During continuous operation of the mining machine, the control unit ensures the parking brake is periodically actuated to maintain spool mobility. This continuous preventive action prevents dust accumulation without interrupting the overall operation, ensuring long-term reliability
3Reliability
If the parking brake is frequently actuated to prevent dust accumulation, then the spool remains mobile, but wear increases reducing component life
Solution Approach 1:
The control unit implements partial actuation of the parking brake at predetermined intervals rather than continuous actuation. This partial action is sufficient to prevent dust accumulation and maintain spool mobility while minimizing wear compared to frequent full actuations
Solution Approach 2:
The control unit changes the actuation parameters by implementing periodic engagement at specific time intervals rather than continuous or frequent actuation. This parameter optimization prevents dust sticking while reducing wear-induced component degradation
4Object-affected harmful factors
If existing brake control devices are used in mining machines, then noise suppression is achieved, but the devices do not prevent silting phenomenon and brake breakage occurs
Solution Approach 1:
The control unit integrates multiple functions: it monitors vehicle stoppage status, determines optimal actuation timing, controls parking brake engagement, and implements periodic actuation for dust prevention. This multi-functional approach replaces specialized noise-control devices with a comprehensive system that ensures brake reliability in mining machine environments
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
Prevents brake failure by ensuring the parking brake is only engaged when the vehicle is stopped, reducing wear and dust accumulation, thus maintaining brake functionality in long-operating mining machines without operator intervention.
Implementation Method 1
a solenoid valve of a spool type is operated to actuate or release the brake with a hydraulic pressure
Data Source
AI summary
A parking brake control device for a transport vehicle is attached to a vehicle body including a parking brake (17) of a negative control type for maintaining a state in which rotation of wheels is stopped, the parking brake control device including a control unit (32) for controlling movement of a spool (21) for magnetizing or demagnetizing a solenoid valve (25) to release or actuate the parking brake (17). The control unit (32) includes a stop determining section (33) that determines whether the vehicle body stops traveling, an actuation command section (34) that actuates the parking brake (17) when the stop determining section (33) determines that the vehicle body is stopped, and a release command section (35) that releases the parking brake (17) after elapse of a preset setting time after the actuation of the parking brake (17) is started by the actuation command section (34).