Crane Equipment: To ensure reliable lifting operations, cranes are equipped with comprehensive devices that act as protective measures or serve as alerts to the operator in case of emergencies, thereby providing safeguarding functions.

1. Various overflow valves in the hydraulic system: They can relieve abnormal high pressure within the circuit, preventing damage to the hydraulic pump and motor, and avoiding overload conditions.

2. Crane Luffing Device: In the event of an unexpected accident, where the high-pressure hose or pipeline in the crane luffing cylinder circuit bursts or is severed, the balance valve in the hydraulic circuit activates, locking the working oil from the cylinder's lower chamber to prevent the crane boom from falling, thereby ensuring the safety of the operation.

3. Boom Extension Device: In the event of an unexpected accident, where the high-pressure hose or pipeline in the boom extension cylinder circuit bursts or is severed, the balance valve in the hydraulic circuit activates, locking the working oil from the lower cylinder chamber, causing the boom to retract automatically, thereby ensuring the safety of the operation.

4. High Limit Device: Once the hook is lifted to the specified height and touches the limit weight, the travel switch is activated, illuminating the "overrun" indicator light. This simultaneously cuts off the operation of lifting the hook, extending the boom, or lowering the boom, ensuring safety. At this point, simply manipulating the handle to lower the hook, retract the boom, or lift the boom (i.e., reverse operation) releases the limit weight, restoring normal operation. In special circumstances, if a minor overrun operation is still required, press the release button on the instrument panel. The limit function is then lifted, but extreme caution must be exercised during this operation to prevent accidents.

5. Leg Locking Mechanism: In the event of an unexpected accident, such as a rupture or cut in the high-pressure hose or pipeline leading to the vertical cylinder of the leg, the bi-directional hydraulic lock within the hydraulic system can seal off the pressure oil in both chambers of the leg locking cylinder, preventing the leg from retracting or being ejected, thereby ensuring the safety of the lifting operation.

6. Lifting Capacity Indicator: The lifting capacity indicator is positioned on the side of the basic arm (i.e., the right side of the control room), allowing the operator, seated within the control room, to clearly observe and accurately indicate the boom's inclination angle and the corresponding rated lifting capacity permitted by the crane under the respective working conditions.

7. Lifting Characteristics Chart: Located on the lower wall of the front side of the control room, this chart lists the rated lifting capacity and lifting height under various boom lengths and working radii for easy reference during operation. It is imperative not to exceed the values specified in the chart during lifting operations. To ensure the reliability of lifting operations, the crane is equipped with more advanced safety devices, which act as protection for the machinery or alert the operator to take note, thereby providing protection.