Small Bridge Crane 10 Ton Price

Small Bridge Crane 10 Ton Price

Because of its simple structure, convenient operation and low cost, hoist cranes are widely used in machinery, chemical industry, light industry, railway and other industries.
 

Due to the particularity of this kind of crane, one person on the ground often takes on several positions, and is responsible for the tasks of operation, command, and command at the same time, and there are many unsafe hidden dangers in the operation.
 

In order to prevent such cranes from lifting accidents, relevant national standards such as GB6067-1985 "Safety Regulations for Hoisting Machinery" have required that hoist cranes must have safety protection devices, such as limiters, end stops, buffers, safety braking device, etc.
 

The equipment of these safety protection devices has effectively improved the safety and reliability of the hoist crane. However, due to various reasons such as design and manufacturing defects, the current safety protection measures for the hoist crane are not perfect. According to daily inspection experience, it is found that the hoist crane Cranes still have defects or deficiencies in terms of phase-wrong and phase-break protection, shaft breakage protection, electric hoist fall protection, and buffer settings.

Since the hoist crane uses a three-phase asynchronous conical braking motor as the power device, and the running direction of the three-phase asynchronous motor is related to the phase sequence of the power supply, when the phase sequence of the power supply changes, the running direction of the motor is the same as the original running direction On the contrary, when the "down" button is pressed at this time, the spreader will rise, and the limiter will not work when it rises to the limit position, which will easily cause accidents.
 

Accidents such as drum crushing, hook group extrusion deformation, and wire rope breakage occur every year on this type of crane due to misalignment.
 

At present, the CD and MD type electric hoists produced and widely used in my country have not adopted phase-wrong and open-phase protection measures (the electric hoists in use are not required to be installed). In order to prevent the occurrence of hoisting injury accidents caused by wrong phase, a wrong phase and open phase protector is added to the electrical control system of the hoist crane.

When the power supply is out of phase or out of phase, the out of phase protector works to disconnect the main power contactor, and the crane must wait for the power supply to return to normal before the crane can continue to work. This can not only prevent the reel from being crushed due to the wrong phase of the power supply, but also prevent the motor from being burned due to the lack of phase operation. Therefore, the role of phase-wrong phase-break protector is very necessary.
 

During the operation of the electric hoist, due to the wear of the wheel rim and the wheel tread, the gap between the wheel and the track gradually increases. At this time, if the running gap cannot be adjusted in time, the electric hoist may fall off the track and cause a lifting accident At the same time, due to the particularity of the assembly of the wheel axle, cracks in the axle are not easy to be found, and the cracks cannot be effectively controlled, and the axle may break, causing a fall accident.
 

In order to prevent the electric hoist from falling accidents caused by this, an anti-broken shaft and derailment protection device can be added at the appropriate position of the electric hoist. When the electric hoist derails or breaks the shaft, the anti-broken shaft and derailment protection device can be effectively suspended on the track, so as to avoid the occurrence of lifting injury accidents.

According to the provisions of GB6o67-1985 (Safety Regulations for Hoisting Machinery), a buffer must be installed at the terminal of the electric hoist. Since there is no clear regulation on the installation position of the device, the buffer of the electric hoist currently used in China is generally installed in the work The middle part of the word steel.
 

When the running wheel of the electric hoist collides with the buffer, the buffer plays a role in absorbing energy, but due to the special structure of the electric hoist, when the running suspension wheel rim collides with the buffer, under the action of inertia The rims wear the buffers extremely hard.
 

When the electric hoist runs for a period of time, the buffer loses its original design function, which increases the unsafe factors during the operation of the electric hoist, and the stability of the electric hoist drops sharply.
 

In order to prevent this failure, the installation position of the buffer can be selected on the lower surface of the I-beam, and the collision between the buffer and the suspension ear plate of the electric hoist can be used as a buffer to improve safety and reliability and extend the use of the buffer life.

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