7 main reasons for “tearing” of EP conveyor belts and preventive storage measures

There are two types of tearing in EP conveyor belts: transverse tearing and longitudinal tearing. The transverse tearing is mostly caused by the cloth layer or wire rope break in the EP EP conveyor belt, which generally belongs to the quality of the EP conveyor belt itself. control. Longitudinal tearing As the hard material in the EP conveyor belt transports the surface of the belt body, the belt body is pierced when the EP conveyor belt load limit is reached. If the damaged area is stretched due to the continuous operation of the EP conveyor belt, the entire EP conveyor belt may be stretched. rip. This article mainly analyzes the longitudinal tear of the EP conveyor belt.

Location of longitudinal tear

Longitudinal tearing of the EP conveyor belt mainly occurs at the tail of the EP conveyor line. The main reason is that the material falling from the blanking opening often entrains foreign materials. These foreign materials usually have sharp edges, which can easily damage the EP conveyor belt. When these foreign objects fall and get stuck on the discharge opening, shelf or roller, they will form a top pressure on the surface of the EP conveyor belt and continue to scratch, and the more the card gets tighter, the more pressure the EP conveyor belt becomes, making it The scratches on the EP conveyor belt quickly deepened, and finally penetrated the EP conveyor belt and formed a tear belt. If found in time, braking the EP conveyor belt immediately can also reduce losses. If not found in time, serious consequences will result.

Causes of belt tearing

There are several reasons for the tearing of the EP conveyor belt:

(1) Belt tearing caused by impurities in the conveyed material.

There are two cases of tearing caused by impurities in the material:

Conveying materials are doped with foreign objects, such as iron, wood rods and other debris, which cause local damage to the belt when falling, and in severe cases directly penetrate the EP conveyor belt and get stuck on the funnel, chute, rack or roller, and the EP conveyor belt forward High-speed operation causes longitudinal tearing of the EP conveyor belt.

Large pieces of material are trapped in the material, stuck between the funnel baffle and the impact idler, or between the idler frame and the return EP conveyor belt. The EP conveyor belt is scratched and stuck for a long time. Once the surface of the EP conveyor belt is punctured Scratches will quickly deepen the wound and eventually scratch the EP conveyor belt to form a tear tape.

Therefore, the removal of large pieces of material and the contained foreign matter is the key to preventing the belt from tearing.

(2) The belt is torn due to improper installation of the auxiliary equipment of the belt EP conveyor.

In addition to the threat of the material itself, the drop of the belt itself during transportation is also a major cause of tearing. Such as the fall of the vibrator lining, the hammer of the crusher, the blanking port adjustment block, etc. may cause the EP conveyor belt to tear.

(3) Belt tear caused by incomplete structure of belt EP conveyor.

The design of the belt EP conveyor is unreasonable, and the drop at the tailing point of the machine is large (the maximum drop on the working site is nearly 10 meters), which causes the material to impact the lower EP conveyor belt at a higher speed, and it is easy to insert the EP conveyor belt at the dropping point. Causes the belt to tear.

(4) The belt is torn due to the blockage.

The transfer chute is small, which easily hinders the passage of materials and impurities and causes the belt to tear.

(5) Tear caused by falling of the middle roller.

The EP conveyor belt is directly pressed on the bracket supporting the middle roller. The heavy load causes the EP conveyor belt to press the bracket tightly, and the bracket scratches the EP conveyor belt like a knife, causing tearing.

(6) Torn at the nose.

Due to the full stack of material on the machine head, the material is pushed into the gap between the drum and the connecting beams on both sides of the machine head, causing the body to tear; or the sharper foreign objects such as the wire on the central part of the head cleaner scraper cause the tear tape.

(7) Tear caused by failure of EP conveyor parts.

If the roller cover is not welded, the rotating end cover cuts the EP conveyor belt like a rotating blade. When the wire rope in the EP conveyor belt is broken, the broken wire rope head will be exposed to the rubber cover from the joint of the EP conveyor belt, the sticky mouth, or the place where the wear is relatively serious. When the exposed wire rope reaches a certain length, it may be twisted into rollers, rollers, etc. With the operation of the EP conveyor belt, the wire rope is pulled out of the EP conveyor belt cover, causing the core to tear.

Preventive measures for EP conveyor belts

In order to prevent the belt from tearing, the following measures should be taken:

(1) Strengthen the control from the source of materials, clean up large pieces of material, increase equipment for removing impurities, and reduce the threat of foreign materials and large pieces of material to the EP conveyor belt.

(2) Strengthen inspections and increase the inspection frequency of post inspections and professional inspections, so that problems can be found and dealt with in a timely manner.

(3) Improve the structure of the EP conveyor. By reducing the drop point of the material dropping point, increasing the buffer baffle, the fine materials fall before the large materials, etc., to reduce the impact, reduce the material speed, and reduce the possibility of impurities inserted into the EP conveyor belt.

(4) Add a tear detection device. When the EP conveyor belt tears, it will be detected as soon as possible, and an alarm signal will be issued and the machine will be stopped to minimize the length of the tear and reduce the loss. However, because belt tearing is caused by various factors, it is not yet possible to completely avoid tearing of the EP conveyor belt. The currently applied anti-tear device and detection device for EP conveyor belts are mainly tear detection devices, which are generally located at the material dropping point and are composed of sensors and controllers. The sensor is installed under the EP conveyor belt or beside the chute, and the controller is installed on the machine side or indoor. When the debris tears the EP conveyor belt, the debris or material penetrating the EP conveyor squeezes the sensor. The sensor sends a signal to the controller, the controller sends an alarm signal and stops.

(5) Adopt a tear-resistant EP conveyor belt.

The anti-tear EP conveyor belt uses a steel wire rope as a longitudinal skeleton material, and a transverse reinforcement is added to the belt body as a tear-proof layer. The structure of this layer is divided into two types: one is using a rubber mesh (steel mesh or chemical fiber mesh Cloth); the other is the use of horizontal rope (steel wire or chemical fiber rope). The covering layer is made of high-strength, high-elasticity, and good abrasion resistance.

(6) Use a EP conveyor belt that can detect tears.

A sensor with a closed coil is added to the EP conveyor belt, and the detector is installed in the vulnerable position of the belt EP conveyor. The detector is connected to the controller. When the EP conveyor runs normally, the sensor passes the detector, and the detector sends out a pulse. When the EP conveyor belt is torn and the sensor coil is cut off, when the sensor passes the detector, the detector stops sending pulses. After the controller receives it, it sends an alarm signal and stops.

(7) Take measures to prevent belt tearing from management.

Prevention and treatment:

Based on the analysis of the above situation, the anti-tearing of the EP conveyor belt should first be manpower from a management perspective, strengthen material quality control, strengthen equipment management, and perform impurity removal control. In addition, from a technical perspective, the following measures can also be taken:

Strengthen routine maintenance to reduce malfunctions and malfunctions. Ensure that all protections are reliable and that any abnormal operation is strictly prohibited.

It puts forward higher technical requirements for the quality of the EP conveyor belt and improves the wear resistance of the cover rubber.

The detection effect of the belt tear detection device and the belt tear record are introduced into the computer management.

Establish detection methods and systems for EP conveyor belts, seek truth from facts, track and analyze records for a long time, compare costs and benefits, and draw correct conclusions.

Pay attention to the protection of EP conveyor belt storage

Comprehensive use of various protection devices for EP conveyor belts. Such as: deviation switch, deviation adjustment device, anti-coil device, anti-pull edge switch, etc. These can protect the belt from tearing. In addition to the measures to be taken at the current stage, the new technology trends of the belt tear detection device should be tracked for a long time. For some new belt tear detection devices and new products and technologies for anti-tear EP conveyor belts, the basis for full investigation In order to minimize losses, experiments and trials are conducted.

To prevent EP conveyor belt tearing accidents, in addition to taking preventive measures, we must strengthen safety education for operation and maintenance workers, implement the post responsibility system, improve and improve various management mechanisms, and strengthen on-site management. Only by combining multiple parties can belt EP conveyors be made. Machine to better serve production and improve production safety.