The hydraulic adjustment device of the coal feeder breaker
Feeder Breaker is a continuous roller crushing equipment that integrates feeding and crushing functions. It is the connection between the mining (coal mining) system and the material handling system, which utilizes chain conveyors and crushing rollers to continuously feed and crush the mined materials.
Chains are core to coal feeder crushers, transmitting power and conveying coal. Proper tension is vital: too loose, and chains slip, create excess noise, and speed up chain-sprocket wear; too tight, and they overburden transmission parts, causing premature chain failure or severe equipment breakdowns.
Hydraulic adjustment devices are the key to solving chain tension issues. Compared to traditional mechanical adjustment, they offer clearer advantages—more precise tuning, easier operation, and better adaptability to harsh conditions.
Working Principle of the Hydraulic Adjustment Device for Chain Tension
Basic Components of the Hydraulic Adjustment Device
The hydraulic adjustment device consists of several main components: hydraulic cylinder, hydraulic pump, control valve, oil tank, pressure gauge, and sensor.
The hydraulic pump provides the necessary power by pressurizing hydraulic oil. The control valve regulates the flow and direction of hydraulic oil, controlling the extension and retraction of the hydraulic cylinder.
The sensor monitors the chain tension in real-time and sends signals to the control system. The pressure gauge displays the system pressure, and the oil tank stores hydraulic oil.
Working Process of Chain Tension Adjustment
The chain tension adjustment process of the hydraulic device is automated and efficient. When the chain is too loose, the sensor detects low tension and sends a signal to the control system. The control system then activates the hydraulic pump, which injects hydraulic oil into the hydraulic cylinder. The hydraulic cylinder pushes the tensioning wheel or chain support component, increasing the chain tension.
When the tension reaches the set value, the sensor sends a feedback signal, the hydraulic pump stops working, and the control valve maintains the pressure to keep the chain tension stable. Conversely, if the chain is too tight, the sensor detects high tension, and the control system commands the control valve to release hydraulic oil from the cylinder. The cylinder retracts under the chain’s tension, reducing the chain tightness to the set value.
The hydraulic adjustment principle offers three key technical advantages: enabling precise adjustment, supporting automatic adjustment, and providing cushioning and shock absorption.
Core Features and Application Advantages of the Hydraulic Adjustment Device
Core Features
High Reliability
Hydraulic components are made of high-quality materials, featuring strong wear resistance and corrosion resistance. This makes the device suitable for the harsh working conditions of coal feeder crushers, such as high dust, high humidity, and high temperature.
Easy Operation and Maintenance
The device is equipped with a simple control panel and a clear pressure gauge, making it easy for operators to monitor and operate. Maintenance mainly involves changing hydraulic oil and cleaning filters, with simple and efficient procedures.
Strong Adaptability
It can be adapted to different models and specifications of coal feeder crushers. Additionally, it can be adjusted according to actual working conditions (such as different coal types and conveying volumes) to meet the needs of different users.
Application Advantages for Users
Improved Equipment Operation Efficiency
By maintaining optimal chain tension, the device avoids chain slippage and jamming, ensuring the continuous and stable operation of coal feeder crushers. This further improves the production efficiency of the entire coal processing line.
Extended Service Life of Equipment Components
Reduced wear on the chain, sprocket, motor, and other components extends their service life. This lowers the frequency of equipment repair and replacement, thereby reducing the production costs of users.
Enhanced Safety
It prevents feeder breaker failures caused by improper chain tension, reducing the risk of safety accidents and ensuring the safety of operators and the production site.
Practical Guide for Hydraulic Adjustment Device Operation
Specific Operation Steps
Set the Chain Tension Value
Based on the technical parameters of the coal feeder crusher and actual working conditions, set the optimal chain tension value on the control panel.
Start the Hydraulic Adjustment Device
Turn on the device’s power switch, and the device will automatically enter the working state.
Monitor the Adjustment Process
Observe the pressure gauge reading and the chain’s operation status. When the chain tension reaches the set value, the device will automatically stop adjustment. If abnormalities occur (such as abnormal pressure gauge readings or unusual chain noise), stop the machine immediately to troubleshoot.
Adjust manually when necessary
If the automatic adjustment function fails, adjust the chain tension manually using the manual control valve. Slowly turn the manual valve to inject or release hydraulic oil while observing the chain tension until it meets the required state.
Operation Precautions
Do not arbitrarily adjust the chain tension value while the coal feeder crusher is running, as this may cause equipment failures.
Keep a safe distance from moving components (such as the chain and tensioning wheel) when the device is working to prevent personal injury.
After operation, turn off the device’s power switch and clean the surface of the device and the surrounding environment.
Maintenance and Troubleshooting of the Hydraulic Adjustment Device
Daily Maintenance
Check the oil level and oil quality in the tank daily. Add the same type of hydraulic oil if the level is too low, and replace the oil immediately if it deteriorates.
Clean the hydraulic system filter weekly to prevent clogging, which may affect the system’s normal operation.
Inspect oil pipe joints and hydraulic components for oil leakage weekly. Tighten joints or replace damaged components if leakage is found.
Check the sensor and control system monthly to ensure the sensor can accurately detect chain tension and the control system can receive and process signals normally.
Regular Maintenance (Every 6 Months)
Disassemble and clean the hydraulic cylinder, hydraulic pump, and control valve. Inspect internal components for wear and replace severely worn parts.
Replace hydraulic oil and filter elements to ensure the cleanliness of the hydraulic system.
Calibrate the sensor and pressure gauge to ensure measurement accuracy.
Common Troubleshooting
Fault 1: The hydraulic adjustment device cannot automatically adjust chain tension
Possible causes: Sensor failure (unable to detect chain tension), hydraulic pump inoperability (power failure or damage), or control valve blockage or failure.
Solutions: Check the sensor (replace if faulty), inspect the power supply and hydraulic pump (repair or replace if damaged), and disassemble and clean the control valve (replace if faulty).
Fault 2: Chain tension cannot be maintained (becomes loose or tight again shortly after adjustment)
Possible causes: Internal leakage in the control valve (unable to maintain pressure), internal leakage in the hydraulic cylinder (hydraulic oil seeps into the cylinder block), or loose oil pipe joints (oil leakage).
Solutions: Check the control valve (repair or replace if leaking internally), inspect the hydraulic cylinder (replace seals or the cylinder if leaking internally), and tighten oil pipe joints.
Fault 3: Abnormal noise in the hydraulic system
Possible causes: Low oil level in the tank (air sucked into the hydraulic pump), contaminated hydraulic oil (containing impurities), or worn hydraulic components (such as the pump or valve).
Solutions: Add hydraulic oil to the normal level, replace the hydraulic oil and clean the system, and repair or replace worn hydraulic components.
The hydraulic adjustment device of the coal feeder breaker is a core component that ensures the chain maintains reasonable tension. It relies on a scientific working principle, along with core advantages such as high reliability and strong adaptability. When operated and maintained in a standardized manner, this device can effectively improve equipment operation efficiency.
Additionally, it helps extend the service life of equipment components and enhance operational safety. Ultimately, it plays a key supporting role in ensuring the stable and efficient operation of both the coal feeder breaker and the entire coal processing production line.
