The internal structure of a coal mine hydraulic chain crane is complex and comprises several key components that work together to enable lifting and maneuvering of heavy loads within the coal mine environment. Here is a breakdown of the main internal components:

1. Hydraulic Power Unit:

• This unit is the heart of the crane's hydraulic system, consisting of a pump driven by a motor (either electric or diesel) that pressurizes the hydraulic fluid.

• The pump draws fluid from a reservoir and pushes it through the system to power the various hydraulic actuators, such as cylinders and motors.

2. Hydraulic Cylinders and Motors:

• Cylinders are used to convert the hydraulic fluid's pressure into linear motion, powering components like the boom extension or stabilizers.

• Hydraulic motors, on the other hand, convert fluid power into rotational motion, driving components like winches or slewing mechanisms.

3. Chain and Winch Mechanism:

• The lifting chain is typically wound around a drum or sprocket and powered by a hydraulic motor through a gearbox.

• The chain is connected to a lifting hook, which attaches to the load. As the hydraulic motor rotates the drum, the chain is either reeled in or let out, raising or lowering the load accordingly.

4. Boom and Jib Assembly:

• The boom is the long arm of the crane that extends out from the base, supporting the lifting mechanism.

• A jib, if present, is a shorter, secondary arm that can be attached to the end of the boom to provide additional reach or flexibility.

• Both the boom and jib may have hydraulic cylinders to adjust their angle and position.

5. Control Valves and Manifolds:

• Control valves regulate the flow of hydraulic fluid to the cylinders and motors, allowing precise control over the crane's movements.

• Manifolds are blocks that contain multiple ports and channels, directing fluid to the appropriate components based on the operator's inputs.

6. Operator Cab and Controls:

• The operator cab is where the crane operator sits to control the crane's movements.

• The controls typically consist of levers, joysticks, or pedals that the operator manipulates to send commands to the hydraulic system.

7. Sensors and Safety Devices:

• Sensors monitor various parameters such as pressure, temperature, and fluid level to ensure safe operation.

• Safety devices include overload protection, emergency stops, and anti-collision systems to prevent accidents.

8. Structural Framework:

• The crane's structural framework supports the weight of the crane itself and the loads it lifts.

• It typically consists of welded steel members and may include reinforcements or bracing to improve rigidity and stability.

Together, these internal components form the backbone of the coal mine hydraulic chain crane, enabling it to perform its lifting and maneuvering tasks safely and effectively in the challenging environment of a coal mine.