The B152 weighing bridge is a double idler (ED20-2) type developed specifically for the stacker reclaimer. They use a five point support for the triangle, a pull type sensor for the middle support, and a non friction trunnion support for the outer support. This fully enclosed structure can prevent vibration, moisture, corrosion, and material accumulation, thus avoiding the problems caused by the use of blade devices and bearing devices in harsh environments. The triangular five point support structure enables the ED20B belt scale to achieve precise measurement in both stacking and retrieval directions.

Passive full face belt breaking protection device

The safe and reliable operation of coal mine belt conveyors directly affects the economic and social benefits of the mine. The reason for belt conveyor belt breakage phenomenon is caused by various factors, such as: during the unstable stage of starting (braking) of the belt conveyor, the traction force (braking force) and inertia force applied by the driving device to the conveyor belt will propagate, stack, reflect within the belt at a certain wave speed, and other factors will affect it. The conveyor belt will cause variable stress changes, and if its instantaneous peak stress exceeds the allowable value, It will damage or even break the conveyor belt. Regardless of the reason, once the phenomenon of belt breakage occurs, the losses caused by its consequences are incalculable and incalculable. In order to improve the reliability and completeness of belt conveyors, reduce economic losses and social impacts caused by belt breakage accidents, it is necessary to install belt breakage protection devices for belt conveyors. The State Administration of Work Safety, the State Administration of Coal Mine Safety Supervision, and the Coal in China Association, in particular, stipulated in Article 375 of the Coal Safety Regulations and the Mechanical and Electrical Safety of the Coal Mine Safety Quality Standardization Standards and Rating Measures (for trial implementation) that "the steel cord belt conveyor shall be equipped with a belt break protection device".

After the conveyor breaks, the distinct characteristics of the tape are:

(1) The tension of the tape will disappear;

(2) The broken tape first rises to a high point under the action of inertial force, and then rapidly slides down under the action of gravity. (Taking the above transportation tape as an example)

The WDBZ type passive dual rotation full section belt breakage protection device is based on the tension of the tape and the sliding distance of the tape, as the basis for whether to brake the tape.

When the sliding distance of the adhesive tape exceeds the safety setting distance, the detection mechanism opens the safety mechanism of the rotating beam, and the equipment is in the starting state. When the tape breaks, the tension of the tape will significantly decrease until it disappears. Under the action of gravity, the upper and lower rotating beams begin to move, clamping the tape between the two beams. By relying on the friction between the two beams and the upper and lower surfaces of the tape, the sliding tape will gradually stop, thereby reducing economic losses and social impact.

Adopting passive power mode, there is no problem of hydraulic leakage or electrical interference.

Based on the sliding distance of the tape and the tension of the tape as the basis for whether to brake the tape, the problem of misoperation has been fundamentally solved.

※ Adopting a dual floating shaft structure, ensuring that the upper and lower rotating beams always maintain full surface contact with the tape, avoiding point or line contact and causing secondary damage to the tape.

※The pure mechanical design ensures simple and convenient installation, with minimal maintenance, safety, and peace of mind.

※ The frame is installed separately from the conveyor to avoid secondary damage to the conveyor frame during braking.

※ Reasonable cleaning method: During the process of lifting and flattening the grooved tape with the lower rotating beam, the material on the tape is thrown out at high speed. The upper rotating beam quickly rotates towards the tape while cleaning the remaining material on the surface of the tape.

※ Implement interlocking control with the conveyor electrical system, that is, when braking is applied, first cut off the driving power of the conveyor, and then apply braking; When the equipment is in a braking state, the conveyor cannot be started and can only be started after resetting.

Comparison of various belt breakage protection devices