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Research on Common Failures of Multi Rope Friction Hoist

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  • Time of issue:2022-04-14
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(Summary description)

Research on Common Failures of Multi Rope Friction Hoist

(Summary description)

  • Categories:News
  • Author:
  • Origin:
  • Time of issue:2022-04-14
  • Views:0
Information

Mine hoisting is a key link to ensure the effective development of coal production, and it is the link that effectively connects the underground and the ground. Once the hoist in the underground hoisting equipment fails, it will inevitably lead to the cessation of the entire coal mine production, and even pose a serious threat to the life and safety of underground operators. Based on this, exploring the common failures of multi-rope terminal hoists commonly used in mines, analyzing the causes of failures and summarizing targeted prevention and control measures is of positive significance for ensuring the continuous and safe development of coal mine production operations.

1 Operation principle analysis of multi-rope friction hoist

According to the difference of hoist operation principle, mine hoists can be divided into two categories: one is single-rope winding hoist; the other is multi-rope friction hoist. The former is suitable for shallow or inclined mines, while the latter is widely used in deep mines. The main difference between the two lies in the connection between the wire rope and the main pulley. The steel wire rope of the multi-rope friction hoist is fixed on the friction pad of the main wheel, and its two ends are respectively connected with the skip and the cage, and the balance tail rope is located at

The bottom of the skip and the cage. As the lifting operation progresses, the steel wire rope will compress the friction pad after being stressed. At this time, the motor uses the decelerating device to drive the main wheel to generate a strong friction force between the friction pad and the wire rope, pushing the main wheel to rotate. , So as to complete the lifting operation. The structure of the multi-rope friction hoist is shown in Figure 1  [No alt text provided for this image

2 Analysis of common failures of multi-rope friction hoist

The multi-rope friction hoist deceleration device can increase the output torque of the motor while achieving the purpose of deceleration, thereby effectively eliminating the load inertia of the hoist. Because the hoist is essentially a heavy-load and low-speed equipment, and its operating environment is changeable and complex, the operation of the skip and cage has a greater impact on the hoisting opportunity. In this case, the load inertia elimination function of the reducer is important for protecting the hoist. Machine safety has a positive meaning.

2.1.1 Gear damage failure

Cracks are a very common damage failure in gear damage. In the continuous operation of the lift, the gears of the reduction gear frequently rub each other, coupled with the high working intensity and high ambient temperature, will reduce the strength of the gear, and gear breakage may occur in the long run. The phenomenon. In order to avoid such failures, on the one hand, it is necessary to strictly control the quality of gear parts and select high-quality gear parts; on the other hand, it is necessary to avoid the continuous high-intensity operation of the hoist and carry out regular Overhaul and replace damaged gears in time [2].

2.1.2 Lubricating oil problem

With the continuous operation of the hoist, the internal gears of the reducer will experience continuous wear, which requires regular replacement of new lubricating oil to eliminate this wear as much as possible. If the quality of the lubricating oil is not good, the lubricating oil film on the outer layer of the gear may be damaged in a high-pressure environment, causing adhesion at the connecting position of the gear, which will cause tearing damage. When the situation is not serious, re-grind the damaged part of the gear to be smooth. When the situation is serious, the gear should be replaced in time. In addition, when the seal of the reduction gear does not meet the standard, there is a problem of lubricating oil leakage, which adversely affects the normal meshing of the gears and aggravates the wear of the gears. In this regard, regular inspections should be made and the damaged or aging sealing elements should be replaced in time [3-4].

No alt text provided for this image

2.1.3 Bearing damage

Damage to the bearing of the reduction gear will cause irregular operation of the internal gear, thereby increasing the degree of wear. Therefore, once abnormal noise is found in the reduction gear during the daily inspection process, attention should be paid immediately to consider whether the bearing is damaged.

2.2 Function and failure of braking device

2.2.1 Function analysis

In order to avoid safety accidents caused by the transmission failure of the deceleration device of the hoist, the braking device is the last line of defense to ensure the safety of the hoist. When emergency braking is required for the cage and the skip, the braking device can quickly lock the brake disc on the lifting drum through mechanical friction. The braking force is mostly generated by a disc spring, and the brake release force is provided by the hydraulic pump station. When the electronic valve is connected to the power supply, the brake device is activated, but the solenoid valve is de-energized, and the brake immediately performs braking operations [5-6].

2.2.2 Failure analysis

Generally speaking, the brake device will adopt the structure of the front cavity to enter the oil. In the event of an oil leakage accident, the oil will affect the disc brake of the brake device, which will reduce the friction coefficient of the brake device and affect the braking effect. In addition, when the solenoid valve of the hydraulic transmission device is blocked, it is difficult for the disc spring of the brake device to generate sufficient braking force, which greatly reduces the braking effect, and even causes the brake to fail in severe cases. The main reason for this kind of problem is that the oil is contaminated. This requires that the installation of the brake device must ensure the overall cleanliness to avoid contamination of the oil. In addition, the excessive wear of the sealing elements in the device will also generate colloidal suspensions, which will block the valve core with the oil and cause the failure of the brake system. Therefore, in daily management, on the one hand, the components of the brake device, especially the sealing components, must be tested regularly, and the components that are strained or damaged must be replaced in time; on the other hand, the oil pollution must be strictly controlled, and new ones must be replaced regularly. Oil, to prevent the oil from being contaminated and blocking the valve core and causing accidents. In addition, the mine should also build a targeted braking device reliability analysis system based on its own actual situation, and through effective electronic equipment monitoring, it can better ensure the safety of the braking device workers in underground production. The frame diagram is shown in Figure 2. Show [7-8].

3 Conclusion

As the key equipment for the continuous development of underground production, the hoist is the core to ensure the safety of mine production. Especially with the advent of the era of deep mining, the application of multi-rope friction hoists has become more and more extensive. Therefore, analyzing the causes of failures and summarizing the corresponding preventive measures are key issues that all mine managers should pay attention.

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