A wet concrete spraying system for underground mines and method of use thereof

Abstract

The invention relates to a wet type concrete injection system for underground mine and its using method. The technical scheme is that the aggregate box (1) is connected with the stirring device (17), the first water tank (2) is connected with the mixed flow device (5) through the wireless dynamic flow regulating valve (3), the stirring device (17), the concrete pump (4) and the mixed flow device (5). The air compressor (15) is communicated with the mixed flow device (5) through the compressed air shunt (16). The quick setting agent box (14) and the second water tank (12) are communicated with the compressed air shunt (16) through the T type three-way ball valve (13), the booster pump (11), the flow monitoring device (10), the valve (9), the atomizing device (8) and the compressed air shunt (16) respectively. The mixed flow device (5) is communicated with the injector (6), the injector (6) is fixed with the water gushing amount telemeter (7) above the injection port, and the water gushing amount telemeter (7) and the flow monitoring device (10) are wirelessly connected with the wireless dynamic flow regulating valve (3). The invention has the characteristics of accurately controlling the water-cement ratio, good mixing effect of the concrete and the quick setting agent and automatic cleaning of the injection system.

Description

Technical Field

[0001] This invention belongs to the technical field of concrete spraying systems. Specifically, it relates to a wet concrete spraying system for underground mines and its application method. Background Technology

[0002] Shotcrete systems are an important means of controlling the stability of surrounding rock in underground mine roadways. Shotcrete support for mine roadways involves spraying a mixture of water, cement, sand, and aggregate at a high speed onto the surface of the surrounding rock to allow it to harden. However, due to the varying amounts of groundwater seeping (gushing) from the surrounding rock surface, and the use of liquid accelerators, if concrete prepared according to a predetermined water-cement ratio is sprayed onto the roadway surface, the seeping (gushing) groundwater will dilute the concrete, making the water-cement ratio uncontrollable. This results in excessive rebound of the concrete, failing to achieve the desired effect, thus affecting the quality of the finished concrete and operational efficiency, and ultimately making it impossible to effectively control the displacement and deformation of the surrounding rock. Therefore, shotcrete systems have attracted the attention of those skilled in the art.

[0003] The spraying system of a wet shotcrete machine and its spraying method (CN 109944606A) has the following disadvantages, although the spraying system has its known advantages: 1. The spraying system is not a complete spraying system, as it lacks concrete preparation materials and equipment; 2. The spraying system does not consider the amount of groundwater seepage (outflow) on the surface of the surrounding rock in the tunnel construction. If the seepage (outflow) is large, the water-cement ratio of the concrete will change, directly affecting the spraying quality of the machine; 3. Due to the short travel and time of the quick-setting agent mixing with the concrete at the spray nozzle, the quick-setting agent and concrete cannot be fully mixed, affecting the hardening degree of the concrete; 4. The spraying system lacks cleaning of the quick-setting agent delivery pipeline, resulting in incomplete cleaning of the equipment and pipeline; 5. The use of high-pressure gas to atomize the liquid quick-setting agent results in poor atomization effect.

[0004] "A Separate Spraying System and Control Method for Shotcrete" (CN 103806921 A) is a technology that adds cement slurry to a dry spraying machine to achieve the effect of a wet spraying machine; "A Full-Process Wet Concrete Shotcrete CG&MA System and Method" (CN 106121239A) is a technology that can quantitatively deliver the components of the raw materials required for the wet spraying process; "Sealed Continuous Secondary Water Addition Wet Spraying Concrete System" (CN 103821148A) is a technology that adds water a second time to a dry spraying process to achieve the effect of wet spraying, reducing rebound and dust; "A High-Performance Wet Shotcrete Construction Device and Construction Method" (CN 104141498A) is a technology that converts a dry spraying process into a wet spraying process by mixing aggregates and cement slurry, reducing concrete rebound and reusing wastewater.

[0005] While the above four technologies each have their own advantages, they also have the following technical drawbacks: 1. Adding liquid accelerators at the nozzles results in insufficient mixing of the concrete and accelerators due to the short mixing time and the short mixing stroke between the accelerators and concrete; 2. The amount of groundwater seepage (inflow) on the surface of the surrounding rock in the tunnel is not considered. If the seepage (inflow) is large, the water-cement ratio of the concrete will change, directly affecting the spraying quality of the spraying machine; 3. The spraying system devices and pipelines are not cleaned after use, which will greatly reduce the service life of the spraying system. Summary of the Invention

[0006] The present invention aims to overcome the defects of the prior art and provides a wet concrete spraying system for underground mines and its application method that can accurately control the water-cement ratio, achieve good mixing effect of concrete and quick-setting agent, and automatically clean the spraying system.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] The wet concrete spraying system for mining includes: an aggregate bin, a first water tank, a wireless dynamic flow regulating valve, a concrete pump, a mixing device, a sprayer, a water flow telemeter, an atomizing device, valves, a flow monitoring device, a booster pump, a second water tank, a T-type three-way ball valve, a quick-setting agent tank, an air compressor, a compressed air distributor, and a mixing device.

[0009] The aggregate bin's outlet C1 is connected to the mixing device's inlet A1 via a pipe, and the first water tank's outlet D1 is connected to the mixing device's inlet A2 via a wireless dynamic flow regulating valve; the mixing device's outlet A3 is connected to the concrete pump's inlet B1 via a conveying pipe, and the concrete pump's outlet B2 is connected to the mixing device's first inlet E1 via a conveying pipe.

[0010] The air compressor outlet G1 is connected to the air inlet H1 of the compressed air splitter through a duct. The first air outlet H2 of the compressed air splitter is connected to the second inlet E2 of the mixing device through a duct. The second air outlet H3 of the compressed air splitter is connected to the third inlet E3 of the mixing device through a duct.

[0011] The outlet P of the quick-setting agent tank is connected to the first inlet K of the T-type three-way ball valve via a water pipe. The outlet Q of the second water tank is connected to the second inlet M of the T-type three-way ball valve via a water pipe. The outlet L of the T-type three-way ball valve is connected to the inlet T1 of the booster pump via a water pipe. The outlet T2 of the booster pump is connected to the inlet N1 of the flow monitoring device via a water pipe. The outlet N2 of the flow monitoring device is connected to the inlet of the valve via a water pipe. The outlet of the valve is connected to the inlet R1 of the atomizing device via a water pipe. The outlet R2 of the atomizing device is connected to the second outlet H3 of the compressed air distributor via an air pipe.

[0012] The discharge port E4 of the mixing device is connected to the inlet F1 on one side of the ejector through a conveying pipe. The other side of the ejector is equipped with an injection port F2. A water flow telemetry instrument is fixed above the injection port F2 of the ejector.

[0013] The water inflow telemetry instrument and flow monitoring device are wirelessly connected to the wireless dynamic flow regulating valve.

[0014] The aggregate bin contains raw materials for preparing concrete, which are a mixture of sand and cement mixed in a predetermined mass ratio.

[0015] The method of using the wet concrete spraying system for mining is as follows:

[0016] Step 1: Adjust the wet concrete spraying system for mining to the working state.

[0017] Step 2. Soaking treatment

[0018] Step 2.1: Turn on the water inflow telemetry instrument to detect the water inflow on the surface of the surrounding rock in the roadway:

[0019] If the water inflow on the surface of the surrounding rock in the monitored roadway is greater than 0.2 L × (min × 10 m) -1 Then proceed to step 3;

[0020] If the water inflow on the surface of the surrounding rock in the monitored roadway is less than 0.2 L × (min × 10 m) -1 Then proceed to step 2.2.

[0021] Step 2.2: Manually connect the second inlet M and outlet L of the T-type three-way ball valve to open the valve.

[0022] Turn on the air compressor, and the compressed air from the air compressor is delivered to the mixing device through the air duct and the compressed air distributor 16.

[0023] The second water tank is opened, and the water in the second water tank is pressurized by the booster pump through the T-type three-way ball valve 13 and then sent to the atomizing device through the flow monitoring device. The atomizing device mixes with the compressed air to form a high-pressure water mist. The high-pressure water mist is sent to the inlet E4 of the injector through the mixing device 5. The high-pressure water mist entering the injector is sprayed onto the surface of the surrounding rock of the tunnel through the spray port F2.

[0024] When the water flow rate sprayed onto the surface of the surrounding rock in the tunnel is 0.2 L × (min × 10 m) -1 The immersion treatment is now complete.

[0025] Step 3. Concrete pumping

[0026] Step 3.1: Manually connect the first inlet K and outlet L of the T-type three-way ball valve to wirelessly connect the flow monitoring device and the water flow telemetry instrument to the wireless dynamic flow regulating valve.

[0027] Step 3.2, Concrete Pumping

[0028] Simultaneously perform steps 3.2.1 to 3.2.3:

[0029] Step 3.2.1: Turn on the mixing device and concrete pump, open the aggregate bin and the first water tank. The water in the first water tank is regulated by the wireless dynamic flow regulating valve and then sent to the mixing device for mixing. The mixed concrete is pressurized by the concrete pump and then enters the mixing device through the first inlet E1 of the mixing device.

[0030] Step 3.2.2: Turn on the air compressor. Compressed air enters the mixing device from the second inlet E2 of the mixing device through the first outlet H2 of the compressed air distributor.

[0031] Step 3.2.3: Open the accelerator tank. The accelerator flows to the booster pump through the T-type three-way ball valve. After being pressurized by the booster pump, the accelerator flows through the flow monitoring device, valve and atomizing device in sequence. After being atomized by the atomizing device, the accelerator enters the mixing device from the third inlet E3 of the mixing device.

[0032] Step 3.2.4: In the mixing device, compressed air disperses the concrete and mixes it with the atomized quick-setting agent, and then sprays it to the construction position through the outlet F2 of the sprayer.

[0033] The concrete spraying work continues until the concrete spraying task is completed.

[0034] Step 4. Automatic cleaning by the system

[0035] Perform steps 4.1 to 4.2 simultaneously:

[0036] Step 4.1 After the concrete spraying is completed, immediately close the aggregate bin; the water in the first water tank continues to flow into the mixing device through the wireless dynamic flow regulating valve, the mixing device 17, and the concrete pump, so that the water in the first water tank automatically cleans the equipment and pipelines it flows through.

[0037] Step 4.2: After the concrete spraying is completed, immediately close the quick-setting agent tank, and then manually switch the T-type three-way ball valve to the state where the second inlet M and outlet L are connected; the water in the second water tank is pressurized by the booster pump through the T-type three-way ball valve and flows sequentially through the monitoring device, valve, atomizing device to the mixing device, so that the water in the second water tank automatically cleans the equipment and pipelines it flows through.

[0038] Step 4.3: The water entering the mixing device is sprayed out from the ejector along with the compressed gas, completing the automatic cleaning of the wet concrete spraying system for mining.

[0039] By adopting the above technical solution, the present invention has the following advantages compared with the prior art:

[0040] 1. Precise control of water-cement ratio. This invention uses a water inflow telemetry instrument to monitor the water inflow on the surface of the roadway surrounding rock and a flow monitoring device to monitor the water flow rate inside the pipeline surrounding rock. By integrating the water inflow information of the roadway surrounding rock and the water flow rate inside the pipeline, the information is transmitted wirelessly to a wireless dynamic flow regulating valve. The wireless dynamic flow regulating valve controls the amount of water entering the first water tank in real time by controlling the valve opening degree, thereby precisely controlling the water-cement ratio of the concrete.

[0041] 2. Thorough mixing of concrete and accelerator. Manually connect the first inlet (K) and outlet (L) of the T-type three-way ball valve. Connect the accelerator tank to the T-type three-way ball valve. A booster pump delivers the accelerator solution to the atomizing device for atomization. Compressed air rapidly transports the atomized accelerator to the mixing device. Concrete is pumped to the mixing device by a concrete pump and mixed with high-pressure air from the first outlet (H2) of the air compressor. This process discretizes the concrete. The atomized accelerator and the discretized concrete mix in the mixing device, increasing the unit area of ​​both the atomized accelerator and the discretized concrete, resulting in more thorough and uniform mixing, significantly improving the quality of concrete pouring.

[0042] 3. Automatic cleaning system for wet concrete spraying in underground mines (hereinafter referred to as the spraying system). After the concrete spraying is completed, immediately close the aggregate bin and the quick-setting agent bin, and simultaneously manually switch the T-type three-way ball valve to the open state between the second inlet M and the outlet L, while keeping other equipment open. At this time, the water in the first water tank flows to the mixing device through the pipeline.

[0043] Water from the second water tank flows into the mixing device via a water supply pipe; compressed air entering the mixing device 5 transports the cleaning water from the mixing device to the ejector via a pipeline, and sprays it out through the ejector nozzle F2, automatically completing the cleaning of the entire spraying system and greatly improving the service life of the equipment.

[0044] Therefore, the present invention has the characteristics of precise control of water-cement ratio, good mixing effect of concrete and quick-setting agent, and automatic cleaning of spraying system. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of one structure of the present invention. Detailed Implementation

[0046] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of protection thereof.

[0047] Example 1

[0048] A wet concrete spraying system for underground mines and its application method. The wet concrete spraying system for underground mines is as follows: Figure 1 As shown, it includes: aggregate bin 1, first water tank 2, wireless dynamic flow regulating valve 3, concrete pump 4, mixing device 5, jet injector 6, water flow telemetry instrument 7, atomizing device 8, valve 9, flow monitoring device 10, booster pump 11, second water tank 12, T-type three-way ball valve 13, quick-setting agent tank 14, air compressor 15, compressed air distributor 16, and mixing device 17.

[0049] like Figure 1 As shown, the discharge port C1 of the aggregate bin 1 is connected to the inlet A1 of the mixing device 17 through a pipe, and the outlet D1 of the first water tank 2 is connected to the inlet A2 of the mixing device 17 through a wireless dynamic flow regulating valve 3; the discharge port A3 of the mixing device 17 is connected to the inlet B1 of the concrete pump 4 through a conveying pipe, and the discharge port B2 of the concrete pump 4 is connected to the first inlet E1 of the mixing device 5 through a conveying pipe.

[0050] like Figure 1 As shown, the air outlet G1 of the air compressor 15 is connected to the air inlet H1 of the compressed air splitter 16 through a duct, the first air outlet H2 of the compressed air splitter 16 is connected to the second inlet E2 of the mixing device 5 through a duct, and the second air outlet H3 of the compressed air splitter 16 is connected to the third inlet E3 of the mixing device 5 through a duct.

[0051] like Figure 1As shown, the outlet P of the quick-setting agent tank 14 is connected to the first inlet K of the T-type three-way ball valve 13 via a water pipe. The outlet Q of the second water tank 12 is connected to the second inlet M of the T-type three-way ball valve 13 via a water pipe. The outlet L of the T-type three-way ball valve 13 is connected to the inlet T1 of the booster pump 11 via a water pipe. The outlet T2 of the booster pump 11 is connected to the inlet N1 of the flow monitoring device 10 via a water pipe. The outlet N2 of the flow monitoring device 10 is connected to the inlet of the valve 9 via a water pipe. The outlet of the valve 9 is connected to the inlet R1 of the atomizing device 8 via a water pipe. The outlet R2 of the atomizing device 8 is connected to the second outlet H3 of the compressed air distributor 16 via an air pipe.

[0052] like Figure 1 As shown, the discharge port E4 of the mixing device 5 is connected to the inlet F1 on one side of the ejector 6 through the conveying pipe. The other side of the ejector 6 is provided with the injection port F2. A water flow telemetry instrument 7 is fixed above the injection port F2 of the ejector 6.

[0053] like Figure 1 As shown, the water inflow telemetry instrument 7 and the flow monitoring device 10 are wirelessly connected to the wireless dynamic flow regulating valve 3.

[0054] The aggregate bin contains raw materials for preparing concrete, which are a mixture of sand and cement mixed in a predetermined mass ratio.

[0055] The method of using the wet concrete spraying system for underground mines is as follows:

[0056] Step 1: Debug the wet concrete spraying system for underground mines to the point of use.

[0057] Step 2. Soaking treatment

[0058] Step 2.1: Turn on the water inflow telemetry instrument 7 to detect the water inflow on the surface of the surrounding rock in the roadway:

[0059] If the water inflow on the surface of the surrounding rock in the monitored roadway is greater than 0.2 L × (min × 10 m) -1 Then proceed to step 3;

[0060] If the water inflow on the surface of the surrounding rock in the monitored roadway is less than 0.2 L × (min × 10 m) -1 Then proceed to step 2.2.

[0061] Step 2.2: Manually connect the second inlet M and outlet L of the T-type three-way ball valve 13 to open valve 9.

[0062] Turn on the air compressor 15, and the compressed air from the air compressor 15 is delivered to the mixing device 5 through the air duct and the compressed air distributor 16.

[0063] The second water tank 12 is opened, and the water in the second water tank 12 is pressurized by the booster pump 11 through the T-type three-way ball valve 13 and then sent to the atomizing device 8 through the flow monitoring device 10. The atomizing device 8 mixes with the compressed air to form a high-pressure water mist. The high-pressure water mist is sent to the inlet E4 of the injector 6 through the mixing device 5. The high-pressure water mist entering the injector 6 is sprayed onto the surface of the surrounding rock of the tunnel through the spray port F2.

[0064] When the water flow rate sprayed onto the surface of the surrounding rock in the tunnel is 0.2 L × (min × 10 m) -1 The immersion treatment is now complete.

[0065] Step 3. Concrete pumping

[0066] Step 3.1: Manually connect the first inlet K and outlet L of the T-type three-way ball valve 13, and wirelessly connect the flow monitoring device 10 and the water flow telemetry instrument 7 to the wireless dynamic flow regulating valve 3.

[0067] Step 3.2, Concrete Pumping

[0068] Simultaneously perform steps 3.2.1 to 3.2.3:

[0069] Step 3.2.1: Turn on the mixing device 17 and concrete pump 4, open the aggregate bin 1 and the first water tank 2. The water in the first water tank 2 is regulated by the wireless dynamic flow regulating valve 3 and then transported to the mixing device 17 for mixing. The mixed concrete is pressurized by the concrete pump 4 and then enters the mixing device 5 through the first inlet E1 of the mixing device 5.

[0070] Step 3.2.2: Turn on the air compressor 15. Compressed air enters the mixing device 5 from the second inlet E2 through the first outlet H2 of the compressed air distributor 16.

[0071] Step 3.2.3: Open the accelerator tank 14. The accelerator flows to the booster pump 11 through the T-type three-way ball valve 13. After being boosted by the booster pump 11, the accelerator flows through the flow monitoring device 10, valve 9 and atomizing device 8 in sequence. After being atomized by the atomizing device 8, the accelerator enters the mixing device 5 from the third inlet E3.

[0072] Step 3.2.4: In the mixing device 5, compressed air disperses the concrete and mixes it with the atomized quick-setting agent, and then sprays it to the construction position through the outlet F2 of the sprayer 6.

[0073] The concrete spraying work continues until the concrete spraying task is completed.

[0074] Step 4. Automatic cleaning by the system

[0075] Perform steps 4.1 to 4.2 simultaneously:

[0076] Step 4.1 After the concrete spraying is completed, immediately close the aggregate bin 1; the water in the first water tank 2 continues to flow into the mixing device 5 through the wireless dynamic flow regulating valve 3, the mixing device 17, and the concrete pump 4, so that the water in the first water tank 2 automatically cleans the equipment and pipelines it flows through.

[0077] Step 4.2: After the concrete spraying is completed, immediately close the quick-setting agent tank 14, and then manually switch the T-type three-way ball valve 13 to the state where the second inlet M and outlet L are connected; the water in the second water tank 12 flows through the T-type three-way ball valve 13 and the booster pump 11 to the monitoring device 10, valve 9, atomizing device 8 and mixing device 5 in sequence, so that the water in the second water tank 12 automatically cleans the equipment and pipelines it flows through.

[0078] Step 4.3: The water entering the mixing device 5 is sprayed out from the ejector 6 along with the compressed gas, completing the automatic cleaning of the wet concrete spraying system for mining.

[0079] This specific implementation method has the following advantages compared with the prior art:

[0080] 1. Precise control of water-cement ratio. In this specific embodiment, a water inflow telemetry instrument 7 is used to monitor the water inflow on the surface of the surrounding rock of the roadway and a flow monitoring device 10 is used to monitor the water flow in the surrounding rock of the pipeline. By integrating the water inflow information of the surrounding rock of the roadway and the water flow information in the pipeline, the information is transmitted wirelessly to the wireless dynamic flow regulating valve 3. The wireless dynamic flow regulating valve 3 controls the amount of water entering the first water tank 2 in real time by controlling the opening and closing degree of the valve, thereby precisely controlling the water-cement ratio of the concrete.

[0081] 2. Thorough mixing of concrete and accelerator. The first inlet K and outlet L of the T-type three-way ball valve 13 are manually connected. The accelerator tank 14 is connected to the T-type three-way ball valve 13. The booster pump 11 pumps the accelerator solution to the atomizing device 8 for atomization. Compressed air rapidly delivers the atomized accelerator to the mixing device 5. Concrete is pumped to the mixing device 5 by the concrete pump 4 and mixed with high-pressure air ejected from the first outlet H2 of the air compressor 15. This process discretizes the concrete. The atomized accelerator and the discretized concrete mix in the mixing device 5, increasing the unit area of ​​both the atomized accelerator and the discretized concrete, resulting in more thorough and uniform mixing, significantly improving the quality of concrete pouring.

[0082] 3. Automatic cleaning system for wet concrete spraying in underground mines (hereinafter referred to as the spraying system). After the concrete spraying is completed, immediately close the aggregate bin 1 and the quick-setting agent bin 14, and simultaneously manually switch the T-type three-way ball valve 13 to the conducting state between the second water inlet M and the water outlet L, while keeping other equipment open. At this time, the water in the first water tank 2 flows to the mixing device 5 through the pipeline.

[0083] Water from the second water tank 12 flows through the water supply pipe to the mixing device 5; compressed air entering the mixing device 5 transports the cleaning water from the mixing device 5 to the ejector 6 through the pipeline, and sprays it out through the nozzle F2 of the ejector 6, automatically completing the cleaning of the entire spraying system and greatly improving the service life of the equipment.

[0084] Therefore, this specific embodiment has the characteristics of precise control of water-cement ratio, good mixing effect of concrete and quick-setting agent, and automatic cleaning of spraying system.

Claims

1. A method for using a wet concrete spraying system for underground mines, characterized in that, The wet concrete spraying system includes: an aggregate bin (1), a first water tank (2), a wireless dynamic flow regulating valve (3), a concrete pump (4), a mixing device (5), a sprayer (6), a water flow telemeter (7), an atomizing device (8), a valve (9), a flow monitoring device (10), a booster pump (11), a second water tank (12), a T-type three-way ball valve (13), a quick-setting agent tank (14), an air compressor (15), a compressed air distributor (16), and a mixing device (17). The outlet C1 of the aggregate bin (1) is connected to the inlet A1 of the mixing device (17) through a pipe. The outlet D1 of the first water tank (2) is connected to the inlet A2 of the mixing device (17) through a wireless dynamic flow regulating valve (3). The outlet A3 of the mixing device (17) is connected to the inlet B1 of the concrete pump (4) through a conveying pipe. The outlet B2 of the concrete pump (4) is connected to the first inlet E1 of the mixing device (5) through a conveying pipe. The air outlet G1 of the air compressor (15) is connected to the air inlet H1 of the compressed air splitter (16) through a duct. The first air outlet H2 of the compressed air splitter (16) is connected to the second inlet E2 of the mixing device (5) through a duct. The second air outlet H3 of the compressed air splitter (16) is connected to the third inlet E3 of the mixing device (5) through a duct. The outlet P of the quick-setting agent tank (14) is connected to the first inlet K of the T-type three-way ball valve (13) through a water pipe. The outlet Q of the second water tank (12) is connected to the second inlet M of the T-type three-way ball valve (13) through a water pipe. The outlet L of the T-type three-way ball valve (13) is connected to the inlet T1 of the booster pump (11) through a water pipe. The outlet T2 of the booster pump (11) is connected to the inlet N1 of the flow monitoring device (10) through a water pipe. The outlet N2 of the flow monitoring device (10) is connected to the inlet of the valve (9) through a water pipe. The outlet of the valve (9) is connected to the inlet R1 of the atomizing device (8) through a water pipe. The outlet R2 of the atomizing device (8) is connected to the second outlet H3 of the compressed air distributor (16) through an air pipe. The discharge port E4 of the mixing device (5) is connected to the inlet F1 on one side of the ejector (6) through the conveying pipe. The other side of the ejector (6) is provided with the injection port F2. A water flow telemeter (7) is fixed above the injection port F2 of the ejector (6). The water flow telemetry instrument (7) and the flow monitoring device (10) are wirelessly connected to the wireless dynamic flow regulating valve (3); The steps of the usage method are as follows: Step 1: Adjust the wet concrete spraying system for mining to a usable state; Step 2. Immersion treatment Step 2.1: Turn on the water inflow telemetry instrument (7) to detect the water inflow on the surface of the surrounding rock in the roadway: If the water inflow on the surface of the surrounding rock in the monitored roadway is greater than 0.2 L × (min × 10m). -1 Then proceed to step 3; If the water inflow on the surface of the surrounding rock in the monitored roadway is less than 0.2 L × (min × 10m). -1 Then proceed to step 2.2; Step 2.2: Manually connect the second inlet M and outlet L of the T-type three-way ball valve (13) to open the valve (9); Turn on the air compressor (15), and the compressed air from the air compressor (15) is delivered to the mixing device (5) through the air duct and the compressed air distributor (16); Open the second water tank (12). The water in the second water tank (12) is pressurized by the booster pump (11) through the T-type three-way ball valve (13) and then transported to the atomizing device (8) through the flow monitoring device (10). The atomizing device (8) mixes with the compressed air to form a high-pressure water mist. The high-pressure water mist is transported to the inlet E4 of the injector (6) through the mixing device (5). The high-pressure water mist entering the injector (6) is sprayed onto the surface of the surrounding rock of the roadway through the spray port F2. When the water flow rate sprayed onto the surface of the surrounding rock in the tunnel is 0.2 L × (min × 10m). -1 The immersion treatment is complete; Step 3. Concrete pumping Step 3.1: Manually connect the first inlet K and outlet L of the T-type three-way ball valve (13) to turn on the flow monitoring device (10) and the water flow telemeter (7) to wirelessly connect with the wireless dynamic flow regulating valve (3); Step 3.2, Concrete Pumping Simultaneously perform steps 3.2.1 to 3.2.3: Step 3.2.1: Turn on the mixing device (17) and concrete pump (4), open the aggregate box (1) and the first water tank (2), the water in the first water tank (2) is regulated by the wireless dynamic flow regulating valve (3) and then transported to the mixing device (17) for mixing. The mixed concrete is pressurized and output by the concrete pump (4) and then enters the mixing device (5) through the first inlet E1 of the mixing device (5). Step 3.2.2: Turn on the air compressor (15). Compressed air enters the mixing device (5) from the second inlet E2 of the mixing device (5) through the first outlet H2 of the compressed air distributor (16). Step 3.2.3: Open the accelerator tank (14). The accelerator flows to the booster pump (11) through the T-type three-way ball valve (13). After being boosted by the booster pump (11), the accelerator flows through the flow monitoring device (10), the valve (9) and the atomizing device (8) in sequence. After being atomized by the atomizing device (8), the accelerator enters the mixing device (5) from the third inlet E3 of the mixing device (5). Step 3.2.4: In the mixing device (5), compressed air disperses the concrete and mixes it with the atomized quick-setting agent, and then sprays it to the construction position through the outlet F2 of the sprayer (6). The concrete spraying work continues until the concrete spraying task is completed. Step 4. Automatic cleaning by the system Perform steps 4.1 to 4.2 simultaneously: Step 4.1 After the concrete spraying is completed, immediately close the aggregate bin (1); the water in the first water tank (2) continues to flow into the mixing device (5) through the wireless dynamic flow regulating valve (3), the mixing device (17), and the concrete pump (4), so that the water in the first water tank (2) automatically cleans the equipment and pipelines it flows through. Step 4.2 After the concrete spraying is completed, immediately close the quick-setting agent tank (14), and then manually switch the T-type three-way ball valve (13) to the state where the second inlet M and outlet L are connected; the water in the second water tank (12) is pressurized by the booster pump (11) through the T-type three-way ball valve (13) and flows sequentially through the flow monitoring device (10), valve (9), atomizing device (8) to the mixing device (5), so that the water in the second water tank (12) automatically cleans the equipment and pipelines it flows through; Step 4.3: Water entering the mixing device (5) is sprayed out from the ejector (6) along with compressed gas, completing the automatic cleaning of the wet concrete spraying system for mining.

2. The method of using the wet concrete spraying system for underground mines according to claim 1, characterized in that, The aggregate bin contains raw materials for preparing concrete, which are a mixture of sand and cement mixed in a predetermined mass ratio.

Images