A wet type concrete spraying machine for coal mine and a using method thereof

Abstract

The present application relates to a kind of coal mine wet concrete spraying machine and method, including track chassis and setting on track chassis forced mixing mechanism, skip loading mechanism, pumping system, hydraulic system, electrical system, accelerator system and air supply system.The present application has the beneficial effects of on-site mixing and self-loading.

Description

Technical Field

[0001] This invention relates to the field of wet spraying machine technology for coal mines, specifically to a wet concrete spraying machine for coal mines. Background Technology

[0002] Wet spraying machines for coal mines are mainly used for anchor spraying support in underground coal mine roadways and are a core means of maintaining roadway stability. Wet spraying technology solves the pain points of traditional dry / wet spraying, such as excessive dust, high rebound rate, unstable support quality, and poor operation safety. At the same time, it responds to safety and environmental protection supervision and the demand for efficient support in modern mines, and is gradually becoming the mainstream equipment for anchor spraying support in coal mine roadways.

[0003] Currently, most existing wet shotcrete machines for coal mines lack self-loading and mixing capabilities. In actual operation, commercial concrete is often transported to the working face in the roadway using a coal mine mixer truck, or transported over long distances using a mine concrete conveyor. However, these methods have significant drawbacks. On the one hand, they greatly increase production costs and subsequent maintenance costs; on the other hand, some underground roadways in coal mines are quite narrow, making it impossible for coal mine mixer trucks to pass smoothly, and mine concrete conveyor also faces many difficulties in moving and laying pipelines. Moreover, when coal mine mixer trucks or mine concrete conveyor are used for long-distance transport, aggregate segregation and moisture loss are likely to occur, leading to pipe blockage during spraying and a significant increase in rebound rate. In addition, most existing wet shotcrete machines for coal mines are fixed or towed structures, which are difficult to adapt to the characteristics of small cross-sections and numerous turns in underground roadways, and cannot meet the needs of the dispersed underground excavation faces and repair points that require frequent relocation. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies by providing a wet concrete spraying machine for coal mines capable of on-site mixing and self-loading, along with its usage method.

[0005] The present invention is achieved through the following technical solution: a wet concrete spraying machine for coal mines is provided, including a tracked chassis and a forced mixing mechanism, a tipping feeding mechanism, a pumping system, a hydraulic system, an electrical system, a quick-setting agent system and an air supply system installed on the tracked chassis.

[0006] Preferably, the forced mixing mechanism includes a bucket rotatably mounted on a tracked chassis. The bucket contains a mixing shaft, mixing blades bolted to the mixing shaft, and a drive assembly connected to the mixing shaft. The drive assembly includes a cycloidal motor mounted on the outer wall of the bucket, a drive sprocket coaxially fixed to the output end of the cycloidal motor, and a driven sprocket connected to the drive sprocket via a chain. The mixing shaft extends laterally to the outside of the bucket and is coaxially fixed to the driven sprocket. The forced mixing mechanism includes a bucket rotatably mounted on a tracked chassis. Inside the bucket is a mixing shaft, mixing blades bolted to the mixing shaft, and a drive assembly connected to the mixing shaft. The drive assembly includes a cycloidal motor mounted on the outer wall of the bucket, a drive sprocket coaxially fixed to the output end of the cycloidal motor, and a driven sprocket connected to the drive sprocket via a chain. The mixing shaft extends laterally outside the bucket and is coaxially fixed to the driven sprocket. When in use, after adding materials such as sand, gravel, and cement into the bucket, the cycloidal motor is started via a remote control. The cycloidal motor drives the drive sprocket to rotate, which is then transmitted to the driven sprocket via a chain. The driven sprocket drives the mixing shaft, which is coaxially fixed to it, to rotate. The mixing shaft extends laterally into the bucket, driving the mixing blades bolted to the mixing shaft to rotate at high speed. This causes the material to form a combined up-and-down circulation and left-and-right convection motion within the bucket, continuously mixing until the concrete is uniform. After mixing is complete, the cycloidal motor is stopped.

[0007] Preferably, the tipping bucket loading mechanism includes a connecting rod rotatably connected to the tipping bucket, a secondary connecting rod rotatably connected to the connecting rod, a main connecting rod with one end hinged to the secondary connecting rod and the other end rotatably connected to the tipping bucket, and a tipping cylinder rotatably mounted on the tracked chassis, wherein the piston rod end of the tipping cylinder is rotatably connected to the hinge joint of the secondary connecting rod and the main connecting rod. The tipping bucket loading mechanism includes a connecting rod rotatably connected to the tipping bucket, a secondary connecting rod rotatably connected to the connecting rod, a main connecting rod with one end hinged to the secondary connecting rod and the other end rotatably connected to the tipping bucket, and a tipping cylinder rotatably mounted on the tracked chassis. The piston rod end of the tipping cylinder is rotatably connected to the hinge joint of the secondary connecting rod and the main connecting rod. When the device is in use, after the concrete is evenly mixed, the tipping cylinder is controlled by a remote control, causing the piston rod of the tipping cylinder to push the hinge joint of the main connecting rod and the secondary connecting rod. The secondary connecting rod swings, and the power is transmitted through the main connecting rod, causing the tipping bucket to tilt upwards around the connecting rod. The tipping bucket can tilt up to 120 degrees, unloading the concrete into the hopper of the pumping system. After unloading is completed, the piston rod of the tipping cylinder is retracted by a remote control, so that the tipping bucket returns to the horizontal loading position.

[0008] Preferably, the tracked chassis is equipped with a hydraulic motor and a normally closed wet brake. The hydraulic motor is connected to an explosion-proof electro-hydraulic proportional valve within the hydraulic system. By installing a hydraulic motor and a normally closed wet brake on the tracked chassis, and connecting the hydraulic motor to the explosion-proof electro-hydraulic proportional valve within the hydraulic system, when the equipment is moved, a travel command is issued via remote control. The explosion-proof electro-hydraulic proportional valve adjusts the hydraulic oil flow and direction according to the command, driving the hydraulic motors on both sides to rotate. The hydraulic motors drive the tracks to move. When stopping is required or a malfunction occurs, the normally closed wet brake automatically brakes, locking the hydraulic motor output shaft to prevent slippage.

[0009] Preferably, the pumping system includes a hopper fixed to a tracked chassis, an S-tube and secondary mixing mechanism disposed within the hopper, a concrete conveying cylinder disposed at the rear end of the hopper, a washing chamber, a main pumping cylinder, and a discharge port disposed at the front end of the hopper. In operation, after concrete is unloaded into the hopper, the pumping mode is activated via remote control. This causes the hydraulic system to drive the main pumping cylinder to extend and retract alternately. The main pumping cylinder, in turn, drives the concrete conveying cylinder to alternately perform the actions of suction and pumping. Simultaneously, the S-tube within the hopper swings left and right in coordination with the alternating actions of the concrete conveying cylinder, continuously drawing in and pumping out concrete from the hopper through the discharge port within the pumping system.

[0010] Preferably, the electrical system includes an explosion-proof electromagnetic starter, an explosion-proof three-phase asynchronous motor, a mining explosion-proof and intrinsically safe PLC control box, an audible and visual alarm, a methane power-off device, and explosion-proof LED lighting, all mounted on the tracked chassis. The accelerator system includes an accelerator pump connected to the discharge port of the pumping system on the tracked chassis via a pipeline, and the accelerator pump is connected to an explosion-proof electro-hydraulic proportional valve via a hydraulic pipeline. The air supply system includes an air supply pipeline connected to the discharge port of the pumping system. The electrical system includes an explosion-proof electromagnetic starter, an explosion-proof three-phase asynchronous motor, a mining explosion-proof and intrinsically safe PLC control box, an audible and visual alarm, a methane power-off device, and explosion-proof LED lighting, all mounted on the tracked chassis. The accelerator system includes an accelerator pump connected to the discharge port of the pumping system on the tracked chassis via pipelines. The accelerator pump is connected to the explosion-proof electro-hydraulic proportional valve via hydraulic pipelines. The air supply system includes an air supply pipeline connected to the discharge port of the pumping system. During operation, the explosion-proof electromagnetic starter powers the explosion-proof three-phase asynchronous motor. The methane power-off device monitors the ambient methane concentration in real time and automatically cuts off the power supply when the concentration exceeds the limit. The audible and visual alarm detects malfunctions or... An alarm is triggered when the time limit is exceeded. Explosion-proof LED lights provide illumination to the work face. The mine-use explosion-proof and intrinsically safe PLC control box receives remote control signals and outputs control commands. During concrete spraying, the remote control sends a proportional signal to the explosion-proof electro-hydraulic proportional valve through the PLC control box. The explosion-proof electro-hydraulic proportional valve adjusts the speed of the accelerator pump through the hydraulic pipeline. The accelerator pump draws accelerator from the storage tank at the set flow rate and sends it through the pipeline to the outlet of the pumping system, where it mixes with the pumped concrete. During this process, by opening the underground compressed air valve, compressed air is sent through the air supply pipeline to the outlet of the pumping system, where it is fully mixed with the concrete and sprayed out together, increasing the spraying distance and preventing pipe blockage.

[0011] Preferably, the hydraulic system includes a gear pump mounted on a tracked chassis, and an explosion-proof electro-hydraulic proportional valve and an explosion-proof electro-hydraulic valve connected to the gear pump; the explosion-proof three-phase asynchronous motor is driven and connected to the gear pump; and the mining explosion-proof and intrinsically safe PLC control box is electrically connected to the explosion-proof electro-hydraulic proportional valve and the explosion-proof electro-hydraulic valve respectively. The hydraulic system includes a gear pump mounted on the tracked chassis, and explosion-proof electro-hydraulic proportional valves and explosion-proof electro-hydraulic valves connected to the gear pump. An explosion-proof three-phase asynchronous motor is driven by the gear pump. A mining explosion-proof and intrinsically safe PLC control box is electrically connected to the explosion-proof electro-hydraulic proportional valves and explosion-proof electro-hydraulic valves. After the electrical system is started, the explosion-proof three-phase asynchronous motor is energized and rotates. Its output shaft drives the gear pump through a coupling. The gear pump draws hydraulic oil from the oil tank and outputs pressurized oil. When the remote control is operated, the remote control signal is received and decoded by the mining explosion-proof and intrinsically safe PLC control box. The PLC control box outputs proportional control signals to the explosion-proof electro-hydraulic proportional valves (for actuators requiring stepless adjustment, such as traveling, main pumping cylinders, quick-setting agent pumps, and secondary stirring mechanisms), or outputs switch control signals to the explosion-proof electro-hydraulic valves (for actuators requiring switch control, such as tilting cylinders, vertical outriggers, and pump reversing). The pressurized oil is distributed to each actuator through the valve group to realize the operation of the entire machine.

[0012] Preferably, the device also includes a water supply system, which includes a ball valve mounted on the tipping bucket and connected to the inside of the tipping bucket via a pipe. During use, before mixing, the underground water supply pipeline is connected to the inlet of the ball valve. Based on the material's moisture requirements, the ball valve is opened, allowing water to enter the tipping bucket through the pipe. Water is added while mixing continues until the concrete reaches a suitable slump. After mixing is complete, the ball valve is closed.

[0013] Preferably, the device also includes vertical outriggers mounted on the connecting rod. When the device reaches the work position, the hydraulic system is controlled by a remote control to supply oil to the hydraulic cylinders of the vertical outriggers, causing them to extend downwards and firmly support the ground. After the work is completed, the hydraulic cylinders of the vertical outriggers are controlled by the remote control to reverse the oil supply, causing the outriggers to retract upwards to their highest position, thus facilitating the device's movement and relocation using tracks.

[0014] A method for using a wet concrete spraying machine for coal mines includes the following steps: a. The hydraulic system is controlled by a remote control, which drives the tracked chassis to move. The normally closed wet brake automatically brakes when the machine stops. The speed and torque of the two tracks are controlled by the explosion-proof electro-hydraulic proportional valve, so that the whole machine can be smoothly transferred to the working face in the narrow underground tunnel. When the device reaches the working position, the vertical outriggers are extended by the remote control to support the ground, which increases the overturning stability of the device during operation. b. Start the cycloidal motor with the remote control, pour the mixed bagged materials such as sand and cement into the tipping bucket, open the ball valve on the tipping bucket, and inject coal mine water into the tipping bucket through the pipeline for mixing. The cycloidal motor drives the drive sprocket to rotate, which is transmitted to the driven sprocket via the chain. The driven sprocket drives the mixing shaft and the mixing blades fixed to the outer wall of the mixing shaft to rotate. The high-speed rotation of the mixing blades causes the material to form a compound motion of up-and-down circulation and left-and-right convection in the tipping bucket, so as to achieve uniform mixing. c. The tilting cylinder is extended and retracted by remote control. The piston rod of the tilting cylinder pushes the hinge of the main connecting rod and the auxiliary connecting rod. The auxiliary connecting rod swings and transmits power through the main connecting rod, causing the tipping bucket to rotate around the connecting rod, so that the tipping bucket tilts upward (the maximum tilting angle can reach 120 degrees), and the well-mixed concrete material is unloaded from the tipping bucket into the hopper of the pumping system. d. The hydraulic system is controlled by a remote control, which drives the gear pump to operate using an explosion-proof three-phase asynchronous motor. The pressure oil output by the gear pump is distributed by the explosion-proof electro-hydraulic valve, which drives the main pumping cylinder to alternately extend and retract. The main pumping cylinder drives the concrete conveying cylinder to alternately complete the actions of suction and pumping. At the same time, the S-tube in the hopper swings left and right in coordination with the alternating action of the concrete conveying cylinder, so that the concrete in the hopper is continuously sucked in and pumped out through the discharge port in the pumping system. The remote control adjusts the speed of the accelerator pump proportionally through the explosion-proof electro-hydraulic proportional valve. The accelerator pump is connected to the discharge port in the pumping system through the pipeline, and the accelerator is added to the concrete. Compressed air from the coal mine is sent into the discharge port in the pumping system through the air supply pipeline. After being fully mixed with the concrete, it is sprayed out through the spraying pipeline, which increases the spraying distance and reduces the probability of pipe blockage. e. The explosion-proof three-phase asynchronous motor is powered by an explosion-proof electromagnetic starter, and the explosion-proof LED lighting provides illumination for the working face. The methane power-off device monitors the methane concentration underground in real time and automatically cuts off the power when the concentration exceeds the standard. The audible and visual alarm sounds an alarm when there is an abnormality. The mine explosion-proof and intrinsically safe PLC control box receives remote control signals and is electrically connected to the explosion-proof electro-hydraulic proportional valve and the explosion-proof electro-hydraulic valve respectively to control the operation of the whole machine and realize fault diagnosis and protection. f. Shut down the pumping system, air supply system, quick-setting agent system and cycloidal motor, and control the vertical outriggers to retract, close the ball valve, stop adding water, and use the remaining water to clean the tipping bucket and hopper, and move the equipment to the next work point via the tracked chassis.

[0015] Compared with existing technologies, the beneficial effects of this invention are as follows: On-site instant mixing is achieved through a forced mixing mechanism, avoiding aggregate segregation and moisture loss caused by long-distance transportation, effectively reducing the probability of pipe blockage and rebound rate, and improving spraying quality; the use of chain-driven mixing and multi-link feeding mechanism results in a small overall machine width and low feeding height, coupled with synchronous movement controlled by a tracked chassis and explosion-proof electro-hydraulic proportional valve, enabling flexible relocation in the narrow spaces of underground coal mines; the tipping bucket feeding mechanism enables rapid and clean unloading without the need for auxiliary equipment; the pumping system integrates an S-tube reversing and secondary mixing mechanism to achieve continuous and stable concrete pumping, and the washing chamber facilitates maintenance and cleaning; the electrical system integrates a methane power-off device, audible and visual alarm, explosion-proof components, and an intrinsically safe PLC control box, coupled with a normally closed wet brake and vertical outriggers, comprehensively ensuring safety during underground operations. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a front view of the structure of the present invention; Figure 3 This is a schematic diagram of the forced stirring mechanism in this invention; Figure 4 This is a schematic diagram of the chain drive of the forced stirring mechanism in this invention; Figure 5 This is a schematic diagram of the tipping bucket feeding mechanism in this invention; Figure 6 This is a schematic diagram of the pumping system structure in this invention; As shown in the figure: 1. Explosion-proof electromagnetic starter; 2. Explosion-proof three-phase asynchronous motor; 3. Explosion-proof LED lighting; 4. Accelerator pump; 5. Gear pump; 6. Hopper; 7. Methane power-off device; 8. Connecting rod. 9. Explosion-proof electro-hydraulic proportional valve; 10. Tracked chassis; 11. Pumping system; 12. Secondary connecting rod; 13. Tilting cylinder; 14. Bucket; 15. Main connecting rod; 16. Pipeline; 17. Ball valve; 18. Audible and visual alarm; 19. Mine explosion-proof and intrinsically safe PLC control box; 20. Explosion-proof electro-hydraulic valve; 21. Air supply system; 22. Cycloidal motor; 23. Agitator shaft; 24. Agitator blades; 25. Driven sprocket; 26. Chain; 27. Drive sprocket; 28. Vertical support leg; 29. ​​Pumping main cylinder; 30. Washing chamber; 31. Concrete conveying cylinder; 32. Secondary mixing mechanism; 33. S-tube; 34. Discharge port. Detailed Implementation

[0017] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0018] like Figures 1-6The wet concrete spraying machine for coal mines of the present invention includes a tracked chassis 10 and a forced mixing mechanism, a tipping feeding mechanism, a pumping system 11, a hydraulic system, an electrical system, a quick-setting agent system and an air supply system 21 disposed on the tracked chassis 10.

[0019] The forced mixing mechanism includes a bucket 14 rotatably mounted on a tracked chassis 10. The bucket 14 contains a mixing shaft 23, mixing blades 24 bolted to the mixing shaft 23, and a drive assembly connected to the mixing shaft 23. The drive assembly includes a cycloidal motor 22 mounted on the outer wall of the bucket 14, a drive sprocket 27 coaxially fixed to the output end of the cycloidal motor 22, and a driven sprocket 25 connected to the drive sprocket 27 via a chain 26. The mixing shaft 23 extends laterally beyond the bucket 14 and is coaxially fixed to the driven sprocket 25. During use, the mixing shaft 14 rotates to move the mixing blades towards the bucket. After sand, gravel, cement, and other materials are added to the bucket 14, the cycloidal motor 22 is started by remote control. The cycloidal motor 22 drives the drive sprocket 27 to rotate, which is transmitted to the driven sprocket 25 via the chain 26. The driven sprocket 25 drives the mixing shaft 23, which is coaxially fixed to it, to rotate. The mixing shaft 23 extends laterally into the bucket 14, driving the mixing blades 24, which are bolted to the mixing shaft 23, to rotate at high speed. This causes the material to form a compound motion of up-and-down circulation and left-and-right convection within the bucket 14, continuously mixing until the concrete is uniform. After mixing is completed, the cycloidal motor 22 is stopped. The tipping bucket loading mechanism includes a connecting rod 8 rotatably connected to the tipping bucket 14, a secondary connecting rod 12 rotatably connected to the connecting rod 8, a main connecting rod 15 with one end hinged to the secondary connecting rod 12 and the other end rotatably connected to the tipping bucket 14, and a tipping cylinder 13 rotatably mounted on the tracked chassis 10. The piston rod end of the tipping cylinder 13 is rotatably connected to the hinge joint of the secondary connecting rod 12 and the main connecting rod 15. When the device is in use, after the concrete is evenly mixed, the tipping cylinder 13 is controlled by a remote control, causing the piston rod of the tipping cylinder 13 to push the hinge joint of the main connecting rod 15 and the secondary connecting rod 12. The secondary connecting rod 12 swings, and the power is transmitted through the main connecting rod 15, causing the tipping bucket 14 to tilt upward around the connecting rod 8. The tipping bucket 14 can tilt up to 120 degrees, unloading the concrete into the hopper 6 of the pumping system 11. After unloading, the piston rod of the tipping cylinder 13 is retracted by a remote control, so that the tipping bucket 14 returns to the horizontal loading position. By installing a hydraulic motor and a normally closed wet brake on the tracked chassis 10, the hydraulic motor is connected to the explosion-proof electro-hydraulic proportional valve 9 in the hydraulic system. When the equipment is moved, a walking command is issued through the remote control. The explosion-proof electro-hydraulic proportional valve 9 adjusts the hydraulic oil flow and direction according to the command, driving the hydraulic motors on both sides to rotate. The hydraulic motors drive the tracks to move. When it is necessary to stop or encounters a fault, the normally closed wet brake automatically brakes and locks the output shaft of the hydraulic motor to prevent slippage.The pumping system 11 includes a hopper 6 fixed on the tracked chassis 10, an S-tube 33 and a secondary mixing mechanism 32 installed in the hopper 6, a concrete conveying cylinder 31 installed at the rear end of the hopper 6, a washing chamber 30, a main pumping cylinder 29, and a discharge port 34 installed at the front end of the hopper 6. When the device is in use, after the concrete is unloaded into the hopper 6, the pumping mode is started by remote control, which drives the main pumping cylinder 29 to extend and retract alternately. The main pumping cylinder 29 drives the concrete conveying cylinder 31 to alternately complete the actions of suction and pumping. At the same time, the S-tube 33 in the hopper 6 swings left and right in coordination with the alternating action of the concrete conveying cylinder 31, so that the concrete in the hopper 6 is continuously sucked in and pumped out through the discharge port 34 in the pumping system 11. The electrical system includes an explosion-proof electromagnetic starter 1, an explosion-proof three-phase asynchronous motor 2, a mining explosion-proof and intrinsically safe PLC control box 19, an audible and visual alarm 18, a methane power-off device 7, and an explosion-proof LED light 3, all mounted on the tracked chassis 10. The accelerator system includes an accelerator pump 4 connected to the discharge port 34 of the pumping system 11 on the tracked chassis 10 via a pipeline. The accelerator pump 4 is connected to the explosion-proof electro-hydraulic proportional valve 9 via a hydraulic pipeline. The air supply system 21 includes an air supply pipeline connected to the discharge port 34 of the pumping system 11. During operation, the explosion-proof electromagnetic starter 1 is activated, energizing the explosion-proof three-phase asynchronous motor 2. The methane power-off device 7 monitors the ambient methane concentration in real time, automatically cutting off the power supply when the concentration exceeds the limit, triggering an audible and visual alarm. The alarm 18 sounds an alarm when there is a malfunction or over-limit. The explosion-proof LED lighting 3 provides lighting for the working face. The mine explosion-proof and intrinsically safe PLC control box 19 receives remote control signals and outputs control commands. During the concrete spraying process, the remote control sends a proportional signal to the explosion-proof electro-hydraulic proportional valve 9 through the PLC control box. The explosion-proof electro-hydraulic proportional valve 9 adjusts the speed of the accelerator pump 4 through the hydraulic pipeline. The accelerator pump 4 draws accelerator from the storage tank at the set flow rate and sends it to the outlet 34 of the pumping system 11 through the pipeline to mix with the pumped concrete. During this process, the underground compressed air valve is opened to send compressed air through the air supply pipeline to the outlet 34 of the pumping system 11. After being fully mixed with the concrete, it is sprayed out together, which increases the spraying distance and prevents pipe blockage.The hydraulic system includes a gear pump 5 mounted on the tracked chassis 10, and explosion-proof electro-hydraulic proportional valve 9 and explosion-proof electro-hydraulic valve 20 connected to the gear pump 5; an explosion-proof three-phase asynchronous motor 2 is driven by the gear pump 5; a mining explosion-proof and intrinsically safe PLC control box 19 is electrically connected to the explosion-proof electro-hydraulic proportional valve 9 and the explosion-proof electro-hydraulic valve 20 respectively. After the electrical system is started, the explosion-proof three-phase asynchronous motor 2 is energized and rotates, and its output shaft drives the gear pump 5 to operate through a coupling. The gear pump 5 draws hydraulic oil from the oil tank and outputs pressurized oil; the remote control can be used for operation. At this time, the remote control signal is received and decoded by the mine explosion-proof and intrinsically safe PLC control box 19. The PLC control box outputs a proportional control signal to the explosion-proof electro-hydraulic proportional valve 9 according to the instruction (for actuators that require stepless adjustment, such as the walking and pumping main cylinder 29, the quick-setting agent pump 4, and the secondary stirring mechanism 32), or outputs a switch control signal to the explosion-proof electro-hydraulic valve 20 (for actuators that require switch control, such as the tilting cylinder 13, the vertical support leg 28, and the pumping reversing). The pressurized oil is distributed to each actuator through the valve group to realize the operation of the whole machine. It also includes a water supply system, which includes a ball valve 17 installed on the tipping bucket 14. The ball valve 17 is connected to the inside of the tipping bucket 14 through the pipe 16. When the device is in use, before stirring, the underground water supply pipeline is connected to the water inlet of the ball valve 17. According to the dryness and wetness requirements of the material, the ball valve 17 is opened to allow water to enter the inside of the tipping bucket 14 through the pipe 16. Water is added and stirred at the same time until the concrete reaches the appropriate slump. After stirring is completed, the ball valve 17 is closed. It also includes vertical outriggers 28 mounted on connecting rod 8. When the device is in use, after reaching the working position, the hydraulic system is controlled by the remote control to supply oil to the hydraulic cylinder of the vertical outriggers 28. The vertical outriggers 28 extend downwards until they are firmly supported on the ground. After the operation is completed, the hydraulic cylinder of the vertical outriggers 28 is controlled by the remote control to reverse the oil supply, so that the outriggers retract upwards to the highest position, thereby facilitating the device to travel and move around using tracks.

[0020] A method for using a wet concrete spraying machine for coal mines includes the following steps: a. The hydraulic system is controlled by a remote control, which drives the tracked chassis 10 to move. The normally closed wet brake automatically brakes when the machine stops. The speed and torque of the two tracked sides are controlled by the explosion-proof electro-hydraulic proportional valve 9, so that the whole machine can be smoothly transferred to the working face in the narrow underground tunnel. When the device reaches the working position, the vertical outrigger 28 is extended by the remote control to support the ground and increase the overturning stability of the device during operation. b. Start the cycloidal motor 22 with the remote control, pour the mixed bagged materials such as sand and cement into the tipping bucket 14, open the ball valve 17 on the tipping bucket 14, and inject coal mine water into the tipping bucket 14 through the pipe 16 for mixing. The cycloidal motor 22 drives the drive sprocket 27 to rotate, which is transmitted to the driven sprocket 25 through the chain 26. The driven sprocket 25 drives the mixing shaft 23 and the mixing blades 24 which are bolted to the outer wall of the mixing shaft 23 to rotate. The high-speed rotation of the mixing blades 24 causes the material to form a compound motion of up-and-down circulation and left-and-right convection in the tipping bucket 14, so as to achieve uniform mixing. c. The tilting cylinder 13 is extended and retracted by remote control. The piston rod of the tilting cylinder 13 pushes the hinge of the main connecting rod 15 and the auxiliary connecting rod 12. The auxiliary connecting rod 12 swings and transmits power through the main connecting rod 15, causing the tipping bucket 14 to rotate around the connecting rod 8, so that the tipping bucket 14 tilts upward (the maximum tilting angle can reach 120 degrees), and the well-mixed concrete material is discharged from the tipping bucket 14 into the hopper 6 of the pumping system 11. d. The hydraulic system is controlled by a remote control, which drives the explosion-proof three-phase asynchronous motor 2 to operate the gear pump 5. After the pressure oil output by the gear pump 5 is distributed by the explosion-proof electro-hydraulic valve 20, it drives the pumping main cylinder 29 to extend and retract alternately. The pumping main cylinder 29 drives the concrete conveying cylinder 31 to alternately complete the actions of suction and pumping. At the same time, the S-tube 33 in the hopper 6 swings left and right in coordination with the alternating action of the concrete conveying cylinder 31, so that the concrete in the hopper 6 is continuously sucked in and pumped out through the discharge port 34 in the pumping system 11. The remote control adjusts the speed of the accelerator pump 4 proportionally through the explosion-proof electro-hydraulic proportional valve 9. The accelerator pump 4 is connected to the discharge port 34 in the pumping system 11 through the pipeline, and the accelerator is added to the concrete. The compressed air in the coal mine is sent into the discharge port 34 in the pumping system 11 through the air supply pipeline. After being fully mixed with the concrete, it is sprayed out through the spraying pipeline, which increases the spraying distance and reduces the probability of pipe blockage. e. The explosion-proof three-phase asynchronous motor 2 is powered by the explosion-proof electromagnetic starter 1, the explosion-proof LED lighting 3 provides lighting for the working face, the methane power-off device 7 monitors the underground methane concentration in real time and automatically cuts off the power when the concentration exceeds the standard; the audible and visual alarm 18 sounds an alarm when there is an abnormality, and the mine explosion-proof and intrinsically safe PLC control box 19 receives the remote control signal and is electrically connected to the explosion-proof electro-hydraulic proportional valve 9 and the explosion-proof electro-hydraulic valve 20 respectively to control the operation of the whole machine and realize fault diagnosis and protection. f. Shut down the pumping system 11, the air supply system 21, the quick-setting agent system and the cycloidal motor 22, and control the vertical support leg 28 to retract, close the ball valve 17, stop adding water, and use the remaining water source to clean the tipping bucket 14 and the hopper 6, and move the equipment to the next work point via the tracked chassis 10.

[0021] Of course, the above description is not limited to the examples above. Technical features not described in this invention can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solutions of this invention and are not intended to limit this invention. This invention has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention do not depart from the spirit of this invention and should also fall within the scope of protection of the claims of this invention.

Claims

1. A wet concrete spraying machine for coal mines, characterized in that: It includes a tracked chassis (10) and a forced mixing mechanism, a tipping feeding mechanism, a pumping system (11), a hydraulic system, an electrical system, a quick-setting agent system and an air supply system (21) installed on the tracked chassis.

2. The wet concrete spraying machine for coal mines according to claim 1, characterized in that: The forced mixing mechanism includes a tipping bucket (14) rotatably mounted on a tracked chassis. The tipping bucket contains a mixing shaft (23), mixing blades (24) bolted to the mixing shaft, and a drive assembly connected to the mixing shaft. The drive assembly includes a cycloidal motor (22) mounted on the outer wall of the tipping bucket, a drive sprocket (27) coaxially fixed to the output end of the cycloidal motor, and a driven sprocket (25) connected to the drive sprocket via a chain (26). The mixing shaft extends laterally to the outside of the tipping bucket and is coaxially fixed to the driven sprocket.

3. The wet concrete spraying machine for coal mines according to claim 1, characterized in that: The tipping bucket loading mechanism includes a connecting rod (8) rotatably connected to the tipping bucket, a secondary connecting rod (12) rotatably connected to the connecting rod, a main connecting rod (15) with one end hinged to the secondary connecting rod and the other end rotatably connected to the tipping bucket, and a tipping cylinder (13) rotatably mounted on the track chassis. The piston rod end of the tipping cylinder is rotatably connected to the hinge joint of the secondary connecting rod and the main connecting rod.

4. The wet concrete spraying machine for coal mines according to claim 1, characterized in that: The tracked chassis is equipped with a hydraulic motor and a normally closed wet brake. The hydraulic motor is connected to an explosion-proof electro-hydraulic proportional valve in the hydraulic system.

5. The wet concrete spraying machine for coal mines according to claim 4, characterized in that: The pumping system includes a hopper (6) fixed on the tracked chassis, an S-tube (33) and a secondary mixing mechanism (32) installed inside the hopper, a concrete conveying cylinder (31) installed at the rear end of the hopper, a washing chamber (30), a main pumping cylinder (29), and a discharge port (34) installed at the front end of the hopper.

6. The wet concrete spraying machine for coal mines according to claim 4, characterized in that: The electrical system includes an explosion-proof electromagnetic starter (1), an explosion-proof three-phase asynchronous motor (2), a mining explosion-proof and intrinsically safe PLC control box (19), an audible and visual alarm (18), a methane power-off device (7), and an explosion-proof LED lighting lamp (3) mounted on the tracked chassis; the accelerator system includes an accelerator pump (4) connected to the discharge port of the pumping system on the tracked chassis via a pipeline, and the accelerator pump is connected to the explosion-proof electro-hydraulic proportional valve via a hydraulic pipeline; the air supply system includes an air supply pipeline connected to the discharge port of the pumping system.

7. The wet concrete spraying machine for coal mines according to claim 6, characterized in that: The hydraulic system includes a gear pump (5) mounted on a tracked chassis, and an explosion-proof electro-hydraulic proportional valve (9) and an explosion-proof electro-hydraulic valve (20) connected to the gear pump; the explosion-proof three-phase asynchronous motor is driven and connected to the gear pump; the mining explosion-proof and intrinsically safe PLC control box is electrically connected to the explosion-proof electro-hydraulic proportional valve and the explosion-proof electro-hydraulic valve respectively.

8. The wet concrete spraying machine for coal mines according to claim 4, characterized in that: It also includes a water supply system, which includes a ball valve (17) installed on the tipping bucket, and the ball valve is connected to the inside of the tipping bucket through a pipe (16).

9. The wet concrete spraying machine for coal mines according to claim 4, characterized in that: It also includes vertical support legs (28) mounted on the connecting rod.

10. The method of using the wet concrete spraying machine for coal mines according to any one of claims 1-9, characterized in that, Includes the following steps: a. The hydraulic system is controlled by a remote control, which drives the tracked chassis to move. The normally closed wet brake automatically brakes when the machine stops. The speed and torque of the two tracks are controlled by the explosion-proof electro-hydraulic proportional valve, so that the whole machine can be smoothly transferred to the working face in the narrow underground tunnel. When the device reaches the working position, the vertical outriggers are extended by the remote control to support the ground, which increases the overturning stability of the device during operation. b. Start the cycloidal motor with the remote control, pour the mixed bagged materials such as sand and cement into the tipping bucket, open the ball valve on the tipping bucket, and inject coal mine water into the tipping bucket through the pipeline for mixing. The cycloidal motor drives the drive sprocket to rotate, which is transmitted to the driven sprocket via the chain. The driven sprocket drives the mixing shaft and the mixing blades fixed to the outer wall of the mixing shaft to rotate. The high-speed rotation of the mixing blades causes the material to form a compound motion of up-and-down circulation and left-and-right convection in the tipping bucket, so as to achieve uniform mixing. c. The tilting cylinder is extended and retracted by remote control. The piston rod of the tilting cylinder pushes the hinge of the main connecting rod and the auxiliary connecting rod. The auxiliary connecting rod swings and transmits power through the main connecting rod, causing the tipping bucket to rotate around the connecting rod, so that the tipping bucket tilts upward and unloads the well-mixed concrete material from the tipping bucket into the hopper of the pumping system. d. The hydraulic system is controlled by a remote control, which drives the gear pump to operate using an explosion-proof three-phase asynchronous motor. The pressure oil output by the gear pump is distributed by the explosion-proof electro-hydraulic valve, which drives the main pumping cylinder to alternately extend and retract. The main pumping cylinder drives the concrete conveying cylinder to alternately complete the actions of suction and pumping. At the same time, the S-tube in the hopper swings left and right in coordination with the alternating action of the concrete conveying cylinder, so that the concrete in the hopper is continuously sucked in and pumped out through the discharge port in the pumping system. The remote control adjusts the speed of the accelerator pump proportionally through the explosion-proof electro-hydraulic proportional valve. The accelerator pump is connected to the discharge port in the pumping system through the pipeline, and the accelerator is added to the concrete. Compressed air from the coal mine is sent into the discharge port in the pumping system through the air supply pipeline. After being fully mixed with the concrete, it is sprayed out through the spraying pipeline, which increases the spraying distance and reduces the probability of pipe blockage. e. The explosion-proof three-phase asynchronous motor is powered by an explosion-proof electromagnetic starter, and the explosion-proof LED lighting provides illumination for the working face. The methane power-off device monitors the methane concentration underground in real time and automatically cuts off the power when the concentration exceeds the standard. The audible and visual alarm sounds an alarm when there is an abnormality. The mine explosion-proof and intrinsically safe PLC control box receives remote control signals and is electrically connected to the explosion-proof electro-hydraulic proportional valve and the explosion-proof electro-hydraulic valve respectively to control the operation of the whole machine and realize fault diagnosis and protection. f. Shut down the pumping system, air supply system, quick-setting agent system and cycloidal motor, and control the vertical outriggers to retract, close the ball valve, stop adding water, and use the remaining water to clean the tipping bucket and hopper, and move the equipment to the next work point via the tracked chassis.

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