In order to ensure the safe and reliable operation of Dongguan crane, the crane is equipped with a relatively complete safety device to protect the machine parts or remind the operator to pay attention in the event of an accident. So as to play a role in safety protection.

1. Each relief valve in the hydraulic system: it can suppress the abnormal high pressure in the circuit to prevent damage to the hydraulic oil pump and motor, and prevent it from being overloaded.

2. Boom luffing safety device: When an accident occurs and the high-pressure hose or oil pipe in the boom luffing cylinder circuit bursts or is cut off, the balance valve in the hydraulic circuit works to lock the working oil from the lower chamber of the cylinder. So that the boom does not fall, so as to ensure the safety of the operation.

3. Boom telescopic safety device: When an accident occurs in Dongguan crane and the high-pressure hose or oil pipe in the boom telescopic cylinder circuit bursts or is cut off, the balance valve in the hydraulic circuit works to lock the working oil from the lower cavity of the cylinder. Make the hanger retract by itself, thus ensuring the safety of the work.

4. Height limit device: After the hook is raised to the specified height, touch the limit hammer, turn on the travel switch, the "overwind" indicator light will be on, and at the same time cut off the lifting of the hook, the extension of the boom, and the fall of the boom. Wait until the operation of the action to ensure safety. At this time, as long as the hook is lowered, the boom is retracted or the boom is raised (that is, the operation is to the safe side), the limit hammer is released, and the operation returns to normal. In special occasions, if you still need to do a small amount of bypass operation, you can press the release button on the instrument box, and the function of the limit will be released at this time, but the operation at this time must be very careful to prevent accidents.

5. Outrigger locking device: When an accident occurs and the high-pressure hose or oil pipe leading to the vertical cylinder of the outrigger is ruptured or cut, the two-way hydraulic lock in the hydraulic system can block the pressure oil in the two chambers of the outrigger and the cylinder, so that the outrigger cannot be blocked. can be retracted or thrown out, thus ensuring the safety of lifting operations.

6. Lifting weight indicator: The lifting weight indicator is set on the side of the basic arm (that is, on the right side of the control room), and the operator can clearly observe it when sitting in the control room, and can accurately indicate the elevation angle of the boom and the The rated lifting capacity allowed by the crane under the corresponding working conditions.

7. Lifting characteristic table: set on the lower wall panel on the front side of the operating room, the table lists the rated lifting capacity and lifting height under various boom lengths and various working ranges for easy reference during operation. When lifting, the values ​​specified in the table must not be exceeded. In order to ensure the safety and reliability of the lifting operation, the crane is equipped with a relatively complete safety device, so as to protect the machine parts or remind the operator to pay attention in the event of an accident, so as to play a role in safety protection