Coal mine tunnel repair machine: the guardian of coal mine safety production（haoyun）

The editor of Shandong Haoyun Heavy Industry Machinery Co., Ltd. will provide the following content on the coal mine tunnel repair machine: the guardian of coal mine safety production.

In the complex system of coal mining production, tunnels are like the meridians of the human body, undertaking key functions such as coal transportation, ventilation, and pedestrian traffic. However, long-term mining activities and geological stress often lead to deformation, damage, and other issues in the tunnels. Haoyun Heavy Industry uses tunnel repair machines as the core equipment to solve these problems, like loyal guardians, to safeguard coal mine safety production.

1、 Challenges faced by alleys

During the process of coal mining, the tunnels are constantly under immense pressure. On the one hand, as the mining depth increases, the geostress continues to increase, causing continuous compression of the surrounding rock of the roadway, resulting in deformation, convergence, and even phenomena such as roof subsidence and floor bulging. On the other hand, frequent blasting operations, mechanical vibrations, and the impact of adjacent mining areas can also damage the stability of the roadway, causing damage to the roadway support structure, reducing the cross-section of the roadway, and affecting normal production and traffic.

If these tunnel damage issues are not resolved in a timely manner, it will not only increase the difficulty of coal transportation and reduce production efficiency, but also bring serious safety hazards. For example, deformed tunnels may lead to poor ventilation, accumulation of harmful gases, and threaten the life and health of miners; Damaged support structures may cause roof collapse at any time, resulting in casualties and equipment damage. Therefore, timely and effective repair of tunnels is crucial for coal mine safety production.

2、 Working principle and structural composition of tunnel repair machine

The coal mine roadway repair machine is a mechanical equipment specially designed for repairing coal mine tunnels. It integrates multiple advanced technologies and has strong repair capabilities.

（1） Working principle

The tunnel repair machine mainly achieves tunnel repair through a series of coherent actions such as mechanical rock breaking, excavation, loading, and support. When doing homework, first use the front-end rock breaking device, such as a powerful breaking hammer or milling head, to break and clean the damaged tunnel surrounding rock, remove loose rocks and broken support materials. Then, the crushed materials are collected by excavation devices and transported to the back-end transfer equipment, where they are transported to mining cars or belt conveyors and taken out of the roadway. After completing rock breaking and slag removal, new support operations can be carried out according to the requirements of tunnel repair, such as installing anchor rods, cables, etc., to restore the tunnel to a stable and usable state.

（2） Structural composition

1. Chassis system: It usually adopts a track type to provide stable support and good maneuverability for the equipment. The tracked chassis has strong climbing ability and passability, and can adapt to complex terrain conditions underground.
2. Working device: This is the core part of the roadway repair machine used in coal mines, including rock breaking devices and excavation devices. The rock breaking device can be equipped with various types of crushing tools, such as high-frequency crushing hammers, rotary milling heads, etc., according to different geological conditions and repair needs of the tunnel, to achieve efficient crushing work. The excavation device generally consists of a bucket, an oil cylinder, and a connecting rod mechanism, which can quickly collect and load crushed materials.
3. Power system: provides power support for various working components of the equipment, commonly powered by electric motors. Electric motors have the advantages of no pollution and low noise, and are widely used in tunnels with reliable power supply systems. The power system transmits power to various working devices through transmission devices such as gearboxes, driveshafts, chains, etc., to achieve normal operation of the equipment.
4. Hydraulic system: As the “nervous system” of the tunnel repair machine, the hydraulic system is responsible for controlling the actions of various working components of the equipment. It consists of an oil pump, oil pipe, control valve group, and hydraulic cylinder. The oil pump converts the mechanical energy provided by the power system into hydraulic energy, and delivers high-pressure oil to various control valve groups through oil pipes. The control valve groups precisely control the flow direction and pressure of the oil according to the instructions of the operator, driving the hydraulic cylinder to achieve the extension, rotation, swing and other actions of the working device, ensuring the flexible and accurate operation of the equipment.

3、 The important role of roadway repair machine in coal mine safety production

（1） Ensure the stability of the roadway

The coal mine tunnel repair machine can timely repair deformed and damaged tunnels, restore the original cross-sectional shape and support strength of the tunnel through measures such as breaking loose rocks and re supporting, effectively control the deformation of the surrounding rock of the tunnel, prevent further damage to the tunnel, and ensure the long-term stability of the tunnel, providing safe and reliable passage and operation space for coal mine production.

（2） Improve ventilation efficiency

Damaged tunnels often lead to poor ventilation, affecting underground air quality and the normal operation of ventilation systems. The coal mine tunnel repair machine cleans up debris and obstacles in the tunnel, expands the tunnel section, improves ventilation conditions, ensures smooth delivery of fresh air to various work sites, timely discharges harmful gases, creates a good working environment for miners, and reduces safety risks such as gas accumulation.

（3） Reduce labor intensity and safety risks

Traditional tunnel repair work mainly relies on manual labor, which is labor-intensive, inefficient, and operates in dangerous tunnel environments, posing high safety risks to workers. The application of roadway repair machines in coal mines has achieved mechanization and automation of roadway repair operations, greatly reducing manual operation steps and lowering the labor intensity of workers. At the same time, operators can control equipment operations in a relatively safe cab, avoiding direct exposure to hazardous environments and effectively reducing the incidence of safety accidents.

（4） Improve production efficiency

Timely repair of tunnels can ensure the normal operation of coal transportation, ventilation and other systems, reducing production interruptions and delays caused by tunnel problems. The tunnel repair machine, with its efficient rock breaking and excavation capabilities, can quickly complete tunnel repair tasks, shorten repair time, improve the overall production efficiency of coal mines, and ensure stable coal supply.

4、 Conclusion

As an important guarantee equipment for coal mine safety production, the roadway repair machine plays an irreplaceable role in maintaining roadway stability, improving ventilation conditions, reducing labor intensity, and enhancing production efficiency. With the continuous advancement of technology, the performance and intelligence level of Haoyun Heavy Industry’s coal mine tunnel repair machine are also constantly improving. In the future, it will continue to contribute to the safe and efficient development of the coal mine industry, safeguard every “meridian” of coal mine production, and ensure the continuous stability of coal mine safety production.