Petrol Post Hole Digger Safety Control Device Torque Management
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Solution Overview
Problem
Conventional petrol post hole diggers are unsafe when encountering large tree roots or rocks, as they can cause sudden stops and transfer engine torque to the operator, leading to loss of balance and risk of falling, with existing buffer structures and brake devices either failing to mitigate the issue effectively or reducing machine lifespan.
Innovation Solution
A safety control device with a touch rod system that detects sudden stops and reduces engine torque by releasing the throttle cable, allowing the machine to operate at idle speed and preventing torque transmission to the drill bit, thereby maintaining operator balance and extending machine life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If buffer structure is added between engine spindles and drill bits to mitigate impact force, then operator safety is improved, but the buffer structure fails to effectively reduce sudden stops and torque transmission
Solution Approach 1:
The patent replaces the mechanical buffer structure with an electronic control system that uses sensors to detect sudden stops and an electronic throttle controller to manage engine torque. This substitution of mechanical components with electronic control achieves more reliable impact mitigation by directly controlling the root cause (engine torque) rather than attempting to absorb the effect mechanically.
Solution Approach 2:
The patent implements a feedback mechanism where sensors continuously monitor the operational state of the drill bit and provide real-time data to the control unit. When a sudden stop is detected, the system immediately responds by adjusting the throttle position to reduce torque. This closed-loop feedback system ensures reliable and timely mitigation of impact forces.
2Object-affected harmful factors
If brake device is added in engine output spindle to reduce torque transmission, then operator safety is improved, but clutch slipping occurs frequently and heat is generated on friction surfaces, affecting machine life
Solution Approach 1:
The patent replaces the mechanical brake device with an electronic throttle control system that manages torque transmission by controlling the engine's fuel injection and ignition timing. This electronic approach eliminates the need for friction-based braking, preventing clutch slipping and heat generation while extending machine life.
Solution Approach 2:
The patent changes the control parameter from mechanical friction (brake force) to electronic parameter control (throttle position, fuel injection timing). By adjusting these parameters, the system can smoothly reduce torque transmission without the wear and heat associated with mechanical friction, thereby preserving machine components.
3Ease of operation
If operator holds handles firmly to control machine during sudden stop, then machine control is attempted, but operator rotates together with frame and falls down, creating safety risk
Solution Approach 1:
The patent implements preliminary action by detecting the onset of a sudden stop and automatically reducing engine torque before the operator can react. The sensor system continuously monitors drill bit operation and preemptively adjusts the throttle when abnormal conditions are detected, preventing the dangerous situation from developing.
Solution Approach 2:
The system performs self-service by automatically detecting and responding to sudden stops without requiring operator intervention. The electronic control system manages the torque reduction and throttle adjustment autonomously, freeing the operator from the need to firmly grip handles and manually control the machine during dangerous situations.
Data Source
AI summary
This utility type patent publishes a safety control device for petrol post hold digger. It includes an operation frame, respective handles in the opposite two sides of the frame; one is throttle control handle in the right side and another is balance control handle in the left side. The safety control device is mounted on the above of the frame near left side, connected with engine in the middle place of the operation frame by one cable, with the throttle control handle in the right side by another cable. A long touch rod is installed underneath the safety control device, sticking outside of the operation frame to position A as shown in bellow picture.When post hole digger is used, drill bit is driven into soul at clockwise direction. If the drill bit touches big roots or rocks and stops rotation in a sudden, all the inertia and torque from still running engine will be thrown to the operation frame, makes it turn to opposite anticlockwise direction. Then the touch rod, usually sticking out of the frame at position A, will turn to touch leg and rotate in a certain angle towards position B. Detecting this angle change, the safety control device will act and reduce the engine torque by releasing its throttle cable to get a lower speed. As a result, to avoid the operator's danger of falling down, make the machine always operate under comfortable control.This patent is designed to be safe in operation, simple in structure and high practical in use.