In order to ensure the safe operation of the crane, the crane is also designed with many safety devices, so that the security of the machine and the operator can be well protected in the event of an accident. So what safety devices does the crane have?
When accidents occur, the boom expansion (extending and retracting are metaphorical to the flexibility within a certain limit) the high-pressure hose or tubing in the cylinder circuit bursts or cuts off (cut; cut off), the balance in the hydraulic circuit The valve functions to lock the working oil from the lower cavity of the cylinder so that the crane will retract by itself, thereby ensuring the security of the operation.
When an accident occurs and the high-pressure hose or tubing in the boom luffing cylinder circuit bursts or is cut off (cut; cut off), the balance valve in the hydraulic circuit will work, and the lock will come from the bottom of the cylinder. The working oil in the cavity prevents the boom from falling, thereby ensuring the security of the operation.
It can suppress the abnormal high pressure in the circuit to prevent the damage of the hydraulic oil pump and the motor, and prevent it from being in an overload state.
After the lifting hook is raised to the specified height, touch the limit weight, turn on the travel switch, the "target aim" light will be on, and the hook will be cut off (cut off; cut off) at the same time. , The boom is extended, and the boom is lowered to ensure safety. The single beam crane has two operation modes: ground and air. There are two types of ground operation: wired handle operation and remote control handle operation; aerial operation refers to operation in the driver's cab. The driver’s cab has two types: open and closed. It can be divided into two types for installation on the left or right according to the actual situation. There are two types of entry directions: side and end to meet the needs of users. At this time, as long as you manipulate the handle (bǐng) such as descending the hook, retracting the boom or raising the boom (that is, operating to the safe side), the limit weight is released from the restraint, 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 meter box, and the function of the limit will be released at this time, but the operation must be very careful at this time to prevent accidents.
Set on the lower wall panel of the front side of the control room, the table lists the rated lifting weight and lifting height under various boom lengths and various working ranges for easy reference during operation. During the lifting operation, the value 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 more complete safety device to protect the machine parts or remind the operator to pay attention to safety protection in the event of an accident.
When an accident occurs and the high-pressure hose or tubing leading to the vertical cylinder of the outrigger is broken or cut, the two-way hydraulic lock in the hydraulic system can block the outrigger and block the pressure oil in the two chambers of the cylinder, so that the outrigger does not shrink or shrink. Throw it out to ensure the safety of the lifting operation.
The lifting weight indicator is set on the closing side of the basic boom (that is, 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 crane under the corresponding working conditions Allowable rated lifting capacity.
In addition, when operating the crane, be sure to follow the safety operating procedures of the cantilever crane to avoid accidents. Single-girder cranes usually refer to single-girder bridge cranes. The main beams of single-beam crane bridges mostly use I-shaped steel or a combined section of steel and steel plates. The hoisting trolley is often assembled by chain hoists, electric hoists, or hoists as parts of the lifting mechanism.
The above is the safety device of the crane, I believe everyone already knows it. Single-girder cranes usually refer to single-girder bridge cranes. The main beams of single-beam crane bridges mostly use I-shaped steel or a combined section of steel and steel plates. The hoisting trolley is often assembled by chain hoists, electric hoists, or hoists as parts of the lifting mechanism. Of course, safety devices can make our operations safer and require operators to follow the correct procedures.
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