Detailed introduction of electric hoist for metallurgical single beam crane

1) Working principle of double brake:

の metallurgical electric hoist adopts dual brakes. The second brake does not work during normal operation. Only when the metallurgical electric hoist is lifting heavy objects, when the first brake fails or the shaft breaks or the tooth breaks, the heavy objects fall freely. When the reel speed reaches a certain speed (1.25 times the normal speed), the centrifugal force of the roller acting on the swing arm by the cam increases the swing arm swing outwards, overcomes the spring force, and the pawl is inserted into the ratchet groove to make The reel stopped rotating, and the heavy object stopped in the air at this time. When the swing arm swings, the convex body on the swing arm presses down the travel switch, so that the descending contactor cannot descend but can only rise when the power is cut off. In order to lower the suspended weight to the ground, press the ascending button, the reel ascends (as opposed to the descending direction), the pawl is released from the ratchet groove under the action of several wheels and springs, and the ascending button is closed. , The reel stops rising, (due to the failure of the first brake), the weight will fall freely to 1.25 times the normal speed, and it will be braked again. Repeating the above actions several times can make the weight fall safely to the ground.

2), Double limit:

In order to prevent the safety factor of the rising limit, two sets of effective double power-off limiters are set. When the safety limit position is reached, the first set of rising contactor's electrical limit is broken, and when the first set of limiter fails to power off , And the second set of limit stops immediately power off the main contactor to prevent the lifting contact adhesion.

3), Weight limiter:

This machine is a lifting tool for metallurgy. It is used for safe production and use, to prevent dangerous accidents and avoid overloading. An overload limiter is set. When the lifting object reaches 90% of the rated load, the limiter will alarm: when it reaches 95%, it will continue to alarm: when it reaches 105%, it will automatically power off and stop the work, and check the load Carry out the appropriate load reduction and return to normal use.

4) 、Insulation protection:

In order to further provide certain high-temperature protection measures for the parts of the machine that are often affected by high temperatures, a double-layer thermal insulation (internal thermal insulation material) protective layer device is installed under the host and hooks.

5) 、Wire rope:

To prevent damage to the steel wire rope working in a high temperature state, the configuration model is 18×7+1WS high temperature resistant steel core steel wire rope.

6) 、Cable line:

To prevent the occurrence of dangers such as disconnection and loss of control caused by wire aging, adhesion, etc., which are prone to frequent exposure to high temperature environments, install high temperature resistant cables.

7), Distribution box:

To avoid damage to electrical components due to high temperature and easy failure, the distribution box should be set far away from direct heat sources and installed at the end of the taxi.

8), Operation type:

To ensure safe production use and other accidental measures in operation, it is best to set the ground operation + remote control control type. The remote control can be used for long-distance safe operation by operators. The ground operation button can be used safely when the time-monitoring remote control fails.

9), Lifting mechanism:

The electric hoist hoisting mechanism is directly connected by the hoisting motor and the reducer, and the drum is driven by the deceleration, and the wire rope is wound to drive the hook device to rise or fall.

10), Reducer:

The reducer adopts a helical gear three-stage reduction, and the gear and shaft are made of alloy steel or high-quality carbon steel.

11), Reel device

The reel is made of cast steel or seamless steel pipe. The spline is used to transmit power, and the drum shell is welded by steel plate. The drum device is the central part of the hoist. The upper part is connected with the trolley running mechanism, and the lower part is connected with the wire rope voice device to work together. The upper part of the outer cover is limited in installation. Positioner guide rod device.

12), Hook device

The hook is made of steel forging, and the thrust ball bearing is connected with the shell through the hook beam, so that the hook can run freely.

13) 、Operating agency

Electric car. Running motor, running reducer, driven trolley, etc. together form the running mechanism. The operating speed is generally 10m/min, 20m/min.

14), Electrical equipment

The electrical working voltage is three-phase AC 50HZ, 380V, the control voltage is a safety voltage of 36V, and the cables are high temperature resistant cables.

15), Set up safety protection device

Safety protection includes: short circuit protection, loss of voltage protection, double limit protection, electrical interlock protection, overspeed protection, overload protection, safety brake protection, heat insulation protection.

16), The working principle of the safety brake

Under normal working conditions, the safety brake does not work, only when the hook is overspeed, the safety brake works and brakes.

The working environment of metallurgical electric hoist is much more complicated than that of ordinary hoist, so it must be purchased from a regular manufacturer to ensure the quality of the product.