A construction mine guniting material transport passage

Abstract

The utility model relates to the technical field of shotcrete transportation, disclose a kind of infrastructure mine shotcrete transportation passageway, including the vertical through-hole of intercommunication cavern, vertical through-hole is sleeved with support flow guide pipe, and support flow guide pipe is equipped with cement pouring layer between vertical through-hole;The upper end inlet of support flow guide pipe is connected with the vibration feeder of access PLC system, and the lower end of vertical through-hole is communicated with the buffer bin being arranged in cavern, and pneumatic emergency brake gate of access PLC system is installed in the communicating portion, support flow guide pipe is inserted into buffer bin, and underground material level sensor of access PLC system is installed on the bin wall of buffer bin, buffer bin is connected with underground receiving bin, and filter screen is installed at the outlet of buffer bin.

Description

Technical Field

[0001] This utility model relates to the field of shotcrete transportation technology, specifically a shotcrete transportation channel for infrastructure mines. Background Technology

[0002] During the basic construction phase of a coal mine, shotcrete material needs to be continuously supplied underground to support the roadways and prevent collapses. Shotcrete material is usually a mixture of cement, sand and small stones.

[0003] Currently, shotcrete material needs to be loaded onto trucks on the surface and then lowered to the bottom of the mine shaft using a cage. It then needs to be further transported to the working face hundreds or even thousands of meters below the shaft using small underground mine cars or trackless rubber-tired vehicles. Using the existing mine shaft cage as the core equipment for hoisting and transporting shotcrete material has several significant drawbacks:

[0004] 1. Using a shaft cage requires multiple reloading processes for the shotcrete material, which is cumbersome and has low efficiency. According to on-site statistics, it takes 2 to 3 hours per 10 tons, which seriously affects the overall progress of mine construction.

[0005] 2. The shaft cage needs to simultaneously undertake tasks such as personnel lifting, large equipment transportation, and key construction material transfer. However, shotcrete material needs to be transported frequently and for a long time. Using shaft cages to transport shotcrete material will occupy limited mine transportation equipment, increase the overall construction period, increase the cost of hoisting materials, and thus increase equipment purchase and maintenance costs and manpower input.

[0006] 3. Because the shotcrete is a dry material that is a mixture of powder and granules, it is very easy to generate a lot of dust in the various stages of loading on the ground, unloading in the cage, underground transfer and unloading at the working face. This causes dust to fly in the loading area on the surface and the transfer roadway underground, which seriously deteriorates the working environment. Moreover, the dust will harm the respiratory health of workers when inhaled, which does not meet the requirements of green mine construction and occupational health.

[0007] 4. When the shotcrete is transferred underground, it is prone to spillage due to the bumps of the mine car or improper unloading operation. The spilled material may interfere with the normal operation of the underground transportation equipment and even cause transportation safety accidents.

[0008] 5. After the shotcrete material is transported to the work surface, it often needs to be manually mixed a second time. This operation is labor-intensive and is limited by the precision of manual operation, which can easily lead to uneven mixing, resulting in blockage of the shotcrete pipe or substandard roadway support quality, thus creating a risk of collapse.

[0009] In summary, the existing shotcrete transportation method based on well cages has insurmountable defects in terms of efficiency, cost, environmental protection, and safety. Therefore, the industry urgently needs a device that can directly transport shotcrete from the ground to the underground working face. Utility Model Content

[0010] This utility model addresses the problems of traditional shotcrete material transportation, such as numerous links, low efficiency, and high cost due to the occupation of limited mine transportation equipment. It provides a shotcrete material transportation channel for infrastructure mines.

[0011] This utility model is achieved using the following technical solution:

[0012] A type of grout transport channel for infrastructure mining includes a vertical through-hole connecting a chamber, a support guide pipe installed inside the vertical through-hole, and a cement pouring layer between the support guide pipe and the vertical through-hole; the upper inlet of the support guide pipe is connected to a vibrating feeder connected to a PLC system.

[0013] The lower end of the vertical through hole is connected to the buffer chamber located in the chamber, and a pneumatic emergency brake gate connected to the PLC system is installed at the connection point. The support guide pipe extends into the buffer chamber, and an underground material level sensor connected to the PLC system is installed on the wall of the buffer chamber. The buffer chamber is connected to the underground receiving chamber, and a filter screen is installed at the outlet of the buffer chamber.

[0014] During implementation, it includes a vertical through hole connecting the chamber. The vertical through hole serves as the basic channel for conveying the shotcrete material and provides installation space for the support guide pipe. The support guide pipe is installed inside the vertical through hole. The support guide pipe not only supports the borehole channel but also serves as the direct pipeline for conveying the shotcrete material.

[0015] The support guide pipe is composed of multiple support guide pipe sections connected in sequence, and adjacent support guide pipe sections are sealed together by a trapezoidal thread.

[0016] A cement pouring layer is provided between the support and the vertical through hole; the circumferential thickness of the cement pouring layer is ≥100mm. The cement pouring layer includes an anti-seepage pouring layer and a filling pouring layer, which effectively avoids the risk of hole collapse and grout leakage, while ensuring rigid fixation between the support and the hole wall of the vertical through hole.

[0017] The support guide pipe is equipped with a high-pressure ventilation pipe connected to the downhole high-pressure air source. The high-pressure ventilation pipe is equipped with a rotating nozzle. In case of blockage, the rotating nozzle is used to blow back and clear the blockage, ensuring that the passage is unobstructed.

[0018] The top of the support guide pipe is 0.5m above the ground. The upper inlet of the support guide pipe connects to a vibrating feeder integrated with a PLC system. The vibrating feeder feeds the shotcrete material into the support guide pipe. The vibrating feeder is controlled in conjunction with an underground material level sensor via the PLC system, and its speed is adjusted by a variable frequency motor. When the material level in the receiving bin reaches or exceeds 80%, the material level sensor sends a signal to the PLC system, triggering the vibrating feeder to stop operating. The vibrating feeder is configured with a feeding interval of 5-10m³. During the interval, the equipment is inspected to ensure stable material descent, thus achieving automatic adjustment of the receiving bin material level and intelligent control of system start-up and shutdown.

[0019] The lower end of the vertical through hole is connected to the buffer chamber located in the chamber, and a pneumatic emergency brake gate connected to the PLC system is installed at the connection point. It can cut off the material conveying in case of an emergency and link with the entire conveying channel to ensure safety.

[0020] The buffer chamber is used to receive the falling sprayed slurry. The inner wall of the buffer chamber is lined with wear-resistant lining plates. The bottom of the support guide pipe is 1.5m below the lower surface of the top plate of the chamber. The support guide pipe extends into the buffer chamber. An arc-shaped guide plate is provided in the buffer chamber directly opposite the outlet of the support guide pipe. A soft landing pad fixed to the bottom of the buffer chamber is laid under the arc-shaped guide plate.

[0021] The buffer silo is equipped with a ground level sensor connected to the PLC system. The buffer silo is connected to the ground receiving silo, and a filter screen is installed at the outlet of the buffer silo. The filter screen filters the sprayed material after buffering. The filtered material enters the ground receiving silo. The filter screen is cleaned and recycled regularly.

[0022] Furthermore, to effectively control pollution, in addition to adopting a closed transportation system, a dust removal system is also provided. The dust removal system includes dust removal near the outlet of the support guide pipe in the buffer chamber and dust removal in the underground receiving chamber. Specifically, a cyclone dust collector is installed in the buffer chamber at the outlet of the support guide pipe. The cyclone dust collector is a commercially available device. The cyclone dust collector is connected in series with a bag filter. The outlet of the cyclone dust collector is directly connected to the inlet of the bag filter, forming a two-stage dust removal system. After primary purification by the cyclone dust collector, the dust-laden gas directly enters the bag filter for secondary fine filtration through the outlet to treat the dust generated during feeding. A spray dust suppression device is installed in the underground receiving chamber. The spray dust suppression device is a commercially available device.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] This utility model provides a grout transport channel for infrastructure mines. By constructing a vertical through-hole and fixing a support guide pipe within it, a gravity-fed conveying mechanism combined with a buffer bin for soft landing enables rapid transport of grout, effectively avoiding the multiple transfer steps present in traditional cage transport. Furthermore, a vibrating feeder with specific amplitude and frequency, along with a programmable control system, allows for precise control of the feeding speed, ensuring the continuity and stability of material transport. Compared to traditional transport methods, this device significantly reduces the time required for the same transport volume, dramatically improving efficiency and effectively overcoming the schedule limitations of grout transport in infrastructure mines.

[0025] This device enables continuous automated operation, reduces reliance on manual operation, significantly reduces the number of operators, effectively reduces labor intensity, and improves the overall system's continuous operation capability and operational reliability.

[0026] In terms of economic benefits, this device significantly reduces equipment purchase and maintenance costs by eliminating the need for traditional cage hoisting and transfer equipment. It also reduces mechanical wear caused by frequent transfers. Furthermore, the vertical direct transport method alleviates the shortage of shaft transportation resources, shortens material transport paths, significantly reduces overall operating costs, and improves the return on investment for infrastructure mines. Moreover, it significantly improves air quality in both surface and underground working environments, preventing dust hazards to workers' health and meeting green mine construction and occupational health and safety standards. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0028] In the diagram: 1. Vertical through hole; 2. Supporting guide pipe; 3. Cement pouring layer; 4. Buffer chamber; 5. Arc-shaped guide plate; 6. Soft landing pad; 7. Chamber. Detailed Implementation

[0029] The specific embodiments of this utility model will now be described with reference to the accompanying drawings.

[0030] A type of grouting material transportation channel for infrastructure mines is illustrated in the case of its application at Qiyuan Company as a practical operation example. Figure 1 As shown: including a vertical through hole 1 connecting the borehole 7, the diameter of the vertical through hole 1 is Φ200~300mm. The vertical through hole 1 serves as the basic channel for conveying the shotcrete material and provides installation space for the support guide pipe 2. The support guide pipe 2 is installed inside the vertical through hole 1. The support guide pipe 2 not only supports the borehole channel, but also serves as a direct pipeline for conveying the shotcrete material.

[0031] The support guide pipe 2 is composed of multiple support guide pipe sections 2 connected in sequence. The support guide pipe 2 is made of seamless steel pipe with diameter 239.7×12.19mm. Adjacent support guide pipe sections 2 are connected by trapezoidal thread seal, and the trapezoidal thread is sealed by wrapping polytetrafluoroethylene sealing tape.

[0032] A cement pouring layer 3 is provided between the support and diversion pipe 2 and the vertical through hole 1; the circumferential thickness of the cement pouring layer 3 is ≥100mm. The cement pouring layer 3 includes an anti-seepage pouring layer and a filling pouring layer. The filling pouring layer is made of P.O42.5 cement grouting reinforcement, which effectively avoids the risk of hole collapse and grout leakage, while ensuring rigid fixation between the support and diversion pipe 2 and the hole wall of the vertical through hole 1.

[0033] The support guide pipe 2 is equipped with a high-pressure ventilation pipe connected to the downhole high-pressure air source. The high-pressure ventilation pipe is equipped with a rotating nozzle. In case of blockage, the rotating nozzle can be used to blow back and clear the blockage to ensure that the passage is unobstructed. In this embodiment, the high-pressure ventilation pipe is a Φ50mm high-pressure air pipe with a working pressure of 0.5~0.8Mpa. The rotating nozzle rotates at a speed of 30r / min and can blow back and clear the blockage section with a blowing radius ≥0.5m.

[0034] The top of the support guide pipe 2 is 0.5m above the ground. The upper inlet of the support guide pipe 2 connects to a vibrating feeder connected to a PLC system. The vibrating feeder feeds the shotcrete material into the support guide pipe 2. The vibrating feeder is linked to an underground material level sensor via the PLC system. The speed of the vibrating feeder is adjusted by a variable frequency motor, and the measurement accuracy of the material level sensor is ±2%. When the material level in the receiving bin reaches or exceeds 80%, the material level sensor sends a signal to the PLC system, triggering the vibrating feeder to stop operating. In this embodiment, the amplitude of the vibrating feeder is 5~8mm, the frequency is 30~50Hz, and the feeding interval is 5~10m³. During the interval, the equipment is checked to ensure stable material descent with a speed fluctuation deviation ≤5%, thereby achieving automatic adjustment of the material level in the receiving bin and intelligent control of system start-up and shutdown.

[0035] The lower end of the vertical through hole 1 is connected to the buffer chamber 4 located in the chamber 7, and a pneumatic emergency brake gate connected to the PLC system is installed at the connection point. It can cut off the material conveying in case of an emergency and link with the entire conveying channel to ensure safety. The pneumatic emergency brake gate is commercially available. In this embodiment, the gate plate is made of ZGMn13 wear-resistant cast steel. With an air source pressure of 0.6-0.8 MPa, the closing response time is ≤2s, and it can withstand the material impact pressure ≥1 MPa.

[0036] The volume of buffer chamber 4 is 5~8m³. 3The buffer chamber 4 is used to receive falling sprayed slurry. The inner wall of the buffer chamber 4 is lined with wear-resistant plates made of high-chromium cast iron plates with a hardness of HRC≥60 and a thickness of 10~15mm. The bottom of the support guide pipe 2 is 1.5m lower than the lower surface of the top plate of the chamber 7. The support guide pipe 2 extends into the buffer chamber 4. An arc-shaped guide plate 5 is provided in the buffer chamber 4 directly opposite the outlet of the support guide pipe 2. The radius of curvature of the arc-shaped guide plate 5 is 1.2m. A soft landing pad 6 is laid below the arc-shaped guide plate 5 and fixed to the bottom surface of the buffer chamber 4. The soft landing pad 6 is made of multi-layer industrial canvas composite rubber material with a total thickness of ≥50mm, a Shore hardness of 60~70HA, and an elastic deformation of ≤20%. It can absorb ≥80% of the material impact energy, and the buffer chamber reduces the material impact velocity to ≤3m / s.

[0037] The buffer chamber 4 is equipped with an underground material level sensor connected to the PLC system. The buffer chamber 4 is connected to the underground receiving chamber, and a filter screen is installed at the outlet of the buffer chamber 4. The filter screen is a high manganese steel woven mesh with a wire diameter of 3mm and a mesh size of 10mm. The tensile strength is ≥800MPa, the screen inclination angle is 15°, and the interception rate of aggregate impurities is ≥99%. The filter screen filters the buffered sprayed material, and the filtered material enters the underground receiving chamber.

[0038] Furthermore, to effectively control pollution, in addition to adopting a closed transportation system, a dust removal system is also included. This dust removal system comprises dust removal near the outlet of the support guide pipe 2 inside the buffer chamber 4 and dust removal inside the underground receiving chamber. Specifically, a cyclone dust collector is installed inside the buffer chamber 4 at the outlet of the support guide pipe 2. The cyclone dust collector uses commercially available equipment and can handle an air volume of 1500~2000 m³ / h. 3 / h, separation efficiency ≥90%, cyclone dust collector and bag dust collector are connected in series, the filter bags of the bag dust collector are made of PPS needle-punched felt, the filtration accuracy is ≤1μm, and the dust generated during feeding is handled; the underground receiving chamber is equipped with a spray dust suppression device, the atomized particle size is 50~100μm, the water pressure is 0.3~0.4MPa, and the dust suppression efficiency is ≥85%.

[0039] According to practical statistics, this device reduces the overall cost by ≥30% compared to traditional transportation methods, significantly improving the return on investment for infrastructure mines. Compared to the efficiency of traditional cage transportation of 10 tons of material, which takes 2-3 hours, this device can complete the same amount of transportation in just 15 minutes, increasing efficiency by 3 times. Furthermore, since no manual intervention is required for unloading and secondary mixing, this device can reduce the number of operators by 6, greatly reducing the intensity of manual labor.

[0040] The scope of protection claimed by this utility model is not limited to the specific embodiments described above. Moreover, for those skilled in the art, this utility model can have various modifications and alterations. Any modifications, improvements, and equivalent substitutions made within the concept and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A transportation channel for shotcrete material in a construction mine, characterized in that: The system includes a vertical through hole (1) connecting the chamber (7), a support guide pipe (2) is installed inside the vertical through hole (1), and a cement pouring layer (3) is provided between the support guide pipe (2) and the vertical through hole (1); the upper inlet of the support guide pipe (2) is connected to a vibrating feeder connected to the PLC system. The lower end of the vertical through hole (1) is connected to the buffer chamber (4) set in the chamber (7), and a pneumatic emergency brake gate connected to the PLC system is installed at the connection point. The support guide pipe (2) extends into the buffer chamber (4). A ground level sensor connected to the PLC system is installed on the wall of the buffer chamber (4). The buffer chamber (4) is connected to the ground receiving chamber, and a filter screen is installed at the outlet of the buffer chamber (4).

2. The infrastructure mine shotcrete material transportation channel according to claim 1, characterized in that: An arc-shaped guide plate (5) is provided inside the buffer chamber (4) directly opposite the outlet of the support guide pipe (2); a soft landing pad (6) fixed to the bottom surface of the buffer chamber (4) is laid below the arc-shaped guide plate (5).

3. The infrastructure mine shotcrete material transportation channel according to claim 1, characterized in that: The buffer chamber (4) is equipped with a cyclone dust collector at the outlet of the support guide pipe (2). The cyclone dust collector is connected in series with the bag dust collector. The underground receiving chamber is equipped with a spray dust suppression device.

4. The infrastructure mine shotcrete material transportation channel according to claim 1, characterized in that: The support guide pipe (2) is equipped with a high-pressure ventilation pipe connected to the downhole high-pressure gas source, and a rotating nozzle is installed on the high-pressure ventilation pipe.

5. A mine sprayed grout transport channel according to claim 1, characterized in that: The support guide pipe (2) is composed of multiple support guide pipe (2) sections connected in sequence, and two adjacent support guide pipe (2) sections are sealed together by a trapezoidal thread.

6. A mine sprayed grout transport channel according to claim 1, characterized in that: The circumferential thickness of the cement pouring layer (3) is ≥100mm, and the cement pouring layer (3) includes an anti-seepage pouring layer and a filling pouring layer.

7. A mine sprayed grout transport channel according to claim 1, characterized in that: The inner wall of the buffer chamber (4) is lined with a wear-resistant liner, which is made of high-chromium cast iron plate with a hardness of HRC≥60 and a thickness of 10~15mm.

8. A mine sprayed grout transport channel according to claim 1, characterized in that: The top of the support guide pipe (2) is 0.5m above the ground, and the bottom of the support guide pipe (2) is 1.5m below the lower surface of the top plate of the chamber (7).

9. A mine sprayed grout transport channel according to claim 1, characterized in that: The volume of the buffer chamber (4) is 5~8m³. 3 .

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