Bridge cranes are commonly used transportation tools in the production of enterprises and belong to special equipment. Therefore, it is necessary to achieve safety protection. Generally speaking, bridge stoppers and lower beam stoppers are indispensable. The following briefly introduces the effect and importance of these three types of protection equipment.
The limiter is used to avoid overloading the crane. When the starting weight reaches 90% of the additional starting weight, the alarm will be intermittently and the green light will be on. When the starting weight is the same as the additional weight, an intermittent alarm will be issued again. The yellow indicator lights up to show the component. When the weight exceeds the extra weight. The continuous alarm is issued again. When the red light is on, the power of the lift toucher is automatically blocked, with a delay of 2 seconds. The bridge crane will not be able to lift.
The effect of the upper and lower limit equipment is to control the safety of the hook to avoid incidents such as high altitudes on the hook. When the hook of the bridge crane is raised and lowered, the guide rope will run in blocks. When the block reaches the rising limit, the two sets of normal closing points of the upper limit rising circuit are disconnected. After a power failure, the motor cannot be raised to prevent top vibration. However, the two sets of closed points in the descending circuit are in an inactive or closed state, and therefore can operate. Electric hoists generally have two upper and lower limits. One is to use limit switch (cam or split type), which is the same as the ordinary control circuit; the other is ordinary fire protection, which will not disconnect the touch control circuit, but directly disconnect the power supply of the electric hoist.
The travel switch is also called the anti-collision device, which uses the collision of mechanical moving parts to move the contacts, connect or disconnect the control circuit, to achieve a certain control purpose. Usually, this switch is used to limit the orientation or stroke of mechanical movement, so that the moving machine can automatically stop, rotate, change speed, or move back and forth according to a specific orientation or stroke.
The above three types of protection equipment are indispensable safety protection equipment for bridge cranes. After installation, it is necessary to evaluate the debugging to ensure the effectiveness and sensitivity of the equipment.
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