Mining continuous thin spraying device

Abstract

The utility model relates to the technical field of spraying equipment, in particular to a mining continuous thin spraying device which comprises a pneumatic cement grouting pump and a long-rod spray gun assembly, the discharging end of the pneumatic cement grouting pump is connected with the long-rod spray gun assembly, and the long-rod spray gun assembly comprises a storage long rod and a dispersing spray head installed at the discharging end of the storage long rod. The dispersing nozzle comprises a built-in discharging nozzle and an external blowing nozzle which are provided with double-layer jackets, the rear end of the built-in discharging nozzle is provided with a thin spray coating discharging port, the built-in discharging nozzle adopts a ceramic pipe and has an antistatic effect, the caliber of the discharging port is far smaller than the pipe diameter of the long storage rod, the discharging port is used for pressure building of the thin spray coating in the long storage rod, and a hollow interlayer is externally connected with compressed air. And an air outlet gap is reserved at the rear end of the external blowing nozzle and the rear end of the internal discharging nozzle and is used for further blowing and dispersing the sprayed thin spraying paint. The spraying device has the efficient and continuous spraying capacity, the thin spraying construction efficiency of the roadway is improved, and the thin spraying construction period of the underground roadway is shortened.

Description

Technical Field

[0001] This utility model belongs to the technical field of spraying equipment, specifically relating to a continuous thin-film spraying device for mining. Background Technology

[0002] In some areas of underground coal mines, thin-layer spraying materials (referred to as thin-layer spray coatings) are needed for roadway thin-layer treatment (referred to as thin-layer spraying treatment). For example, thin-layer spraying treatment on the inner walls of some easily weathered roadways helps to slow down the weathering rate and improve the safety factor of underground coal mines. Another example is thin-layer spraying treatment on roadways with cracks in gas extraction sections, which seals the cracks and helps to improve gas extraction efficiency. Also, in roadways with high humidity, metal equipment is prone to corrosion. Thin-layer spraying treatment on the inner walls of roadways helps to improve the corrosion resistance of the equipment. In addition, some roadways are relatively stable and do not require thick-layer shotcrete, so thin-layer spraying treatment can also be used, which helps to save on the construction cost of underground coal mine roadways.

[0003] All machinery and equipment in coal mines need to have coal mine safety markings. Currently, underground thin-spraying construction lacks continuous spraying equipment that meets safety and explosion-proof requirements. Traditional pneumatic cement grouting pumps are still used for pulse spraying, spraying material intermittently in one go, which seriously affects the spraying efficiency and makes it difficult to meet the requirements of continuous and efficient construction. Therefore, it is urgent to make corresponding technical improvements and improvements to the existing spraying equipment. Utility Model Content

[0004] In view of the above situation, this utility model provides a continuous thin-coating device for mining, which has efficient continuous coating capability and can better meet the needs of thin-coating construction in tunnels.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A continuous thin-film spraying device for mining includes a pneumatic cement grouting pump and a long-rod spray gun assembly. The pneumatic cement grouting pump includes a slurry tank for storing the thin-film spraying material, a pneumatic stirring motor and a pneumatic grouting pump installed above the slurry tank. The lower end of the output shaft of the pneumatic stirring motor is connected to a stirring paddle. A filter screen is installed at the lower end of the suction pipe of the pneumatic grouting pump. Both the stirring paddle and the filter screen are placed below the liquid surface of the thin-film spraying material in the slurry tank. The discharge end of the pneumatic grouting pump is connected to the long-rod spray gun assembly through a conveying hose. The long-rod spray gun assembly includes a storage rod and a dispersing nozzle. The storage rod is a section of circular steel pipe. The inlet end of the storage rod is connected to the conveying hose of the pneumatic grouting pump. A dispersing nozzle is installed on the outlet end of the storage rod.

[0007] The dispersion nozzle includes a cylindrical internal discharge nozzle and a cylindrical external air blowing nozzle. The front end of the internal discharge nozzle is connected to the discharge end of the storage rod. The rear end of the internal discharge nozzle is provided with an outlet for spraying thin spray paint. The external air blowing nozzle is coaxially sleeved on the outside of the internal discharge nozzle. A hollow interlayer is provided between the external air blowing nozzle and the internal discharge nozzle. An air inlet connector for connecting an external compressed air pipe is installed on the side wall of the hollow interlayer. The front end of the external air blowing nozzle is sealed and fixed to the front end of the internal discharge nozzle. An annular air outlet gap connected to the hollow interlayer is provided between the rear end of the external air blowing nozzle and the rear end of the internal discharge nozzle for spraying and dispersing the thin spray paint sprayed from the internal discharge nozzle.

[0008] Preferably, the storage rod is a steel pipe with a length of ≥1m and an inner diameter of 25-40mm (such as the commonly used 1-inch, 1.2-inch, and 1.5-inch), which has the functions of storing material, pressurizing, and stabilizing pressure, and can ensure the stable and continuous discharge of thin-film coating.

[0009] Preferably, the inner diameter of the discharge port of the built-in discharge nozzle is 6-10 mm, and the diameter of the discharge port is much smaller than the diameter of the storage rod, which helps to achieve pressure build-up of the thin spray coating material in the storage rod.

[0010] Preferably, the width of the air outlet gap is 2-4 mm, which can enhance the speed and pressure of the compressed air ejected from the external air nozzle, and ensure the spraying and dispersing effect of the compressed air on the thin-film coating.

[0011] Preferably, the built-in discharge nozzle is made of ceramic tube, which has anti-static properties, meets the safety and explosion-proof requirements of coal mines, and also helps to improve the wear resistance of the built-in discharge nozzle.

[0012] Preferably, the front end of the built-in discharge nozzle is threadedly connected to the discharge end of the storage rod, which facilitates the disassembly and replacement of the built-in discharge nozzle.

[0013] Preferably, the front end of the external air blowing nozzle is threadedly connected to the front end of the internal discharge nozzle, which facilitates the disassembly and replacement of the external air blowing nozzle.

[0014] Preferably, the external air nozzle is composed of two parts, a front nozzle and a rear nozzle, which are coaxially screwed together. The size of the air outlet gap can be adjusted simply by replacing the rear half of the external air nozzle.

[0015] This utility model also includes other components that enable its normal use, all of which are conventional means in the field. In addition, devices or components not limited in this utility model, such as: pneumatic cement grouting pump and its grout tank, pneumatic mixing motor, mixing paddle, pneumatic grouting pump, pneumatic pump motor, filter screen, conveying hose, etc., all adopt the prior art in the field.

[0016] The beneficial effects of this utility model are as follows:

[0017] This utility model provides a continuous thin-coating device for mining, which is an appropriate upgrade and modification of the existing pneumatic cement grouting pump, enabling it to have a high-efficiency continuous spraying capability. It can better meet the needs of thin-coating construction in roadways, help improve the efficiency of thin-coating construction in roadways, shorten the construction cycle of thin-coating in underground roadways, and ensure the production efficiency and economic benefits of coal mines. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the continuous thin-film spraying device for mining in the embodiment.

[0019] Figure 2 for Figure 1 A magnified schematic diagram of the dispersion nozzle structure in section A.

[0020] Figure 3 for Figure 2 A schematic diagram of the end face structure of the dispersion nozzle along the BB direction. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0022] It should be noted that the terms "upper," "lower," "front," "back," "inner," and "outer," which indicate direction or positional relationship, are based on the attached drawings and are used only for ease of description.

[0023] Example 1

[0024] like Figure 1-3As shown, a continuous thin-film spraying device for mining includes a pneumatic cement grouting pump and a long-handled spray gun assembly. The pneumatic cement grouting pump includes a slurry tank 1 for storing the thin-film spraying material, and a pneumatic stirring motor 2 and a pneumatic grouting pump 3 installed above the slurry tank. A pneumatic pump motor 4 is also installed above the pneumatic grouting pump. Both the pneumatic stirring motor and the pneumatic pump motor are powered by compressed air and are each connected to a compressed air pipe. Compared with electric motors, pneumatic motors do not produce sparking, which is more in line with coal mine safety requirements. Three layers of stirring paddles 5 are arranged sequentially from bottom to top at the lower end of the output shaft of the pneumatic stirring motor. A filter screen 7 is installed at the lower end of the suction pipe 6 of the pneumatic grouting pump. The stirring paddles and the filter screen are both placed below the surface of the thin-film spraying material in the slurry tank. The discharge end of the pneumatic grouting pump is connected to the long-handled spray gun assembly through a conveying hose 8. The pneumatic cement grouting pump and the conveying hose are both based on existing technology and will not be described in detail here.

[0025] The long-barrel spray gun assembly includes a storage rod 9 and a dispersing nozzle. The storage rod is a galvanized steel pipe with a length of 1m and an inner diameter of 32mm (i.e., 1.2 inches). It has the functions of storing material, pressurizing, and stabilizing pressure, which can ensure the stable and continuous output of thin-film coating. The material is readily available, inexpensive, and has good corrosion resistance.

[0026] The feed end of the storage rod is connected to the conveying hose of the pneumatic grouting pump, and a dispersion nozzle is installed on the discharge end of the storage rod.

[0027] The dispersion nozzle includes a cylindrical internal discharge nozzle 10 and a cylindrical external air blowing nozzle 11. The front end of the internal discharge nozzle is connected to the discharge end of the storage rod. The rear end of the internal discharge nozzle is provided with an outlet 12 for spraying thin spray paint. The external air blowing nozzle is coaxially sleeved on the outside of the internal discharge nozzle. A hollow interlayer 13 is provided between the external air blowing nozzle and the internal discharge nozzle. An air inlet connector 14 for connecting an external compressed air pipe is installed on the side wall of the hollow interlayer. The front end of the external air blowing nozzle is sealed and fixed to the front end of the internal discharge nozzle. An annular air outlet gap 15 is provided between the rear end of the external air blowing nozzle and the rear end of the internal discharge nozzle, which is connected to the hollow interlayer, for spraying and dispersing the thin spray paint sprayed from the internal discharge nozzle.

[0028] The inner diameter of the discharge port of the built-in discharge nozzle is 8mm, which is much smaller than the diameter of the storage rod. This helps to achieve pressure build-up of the thin-film coating material within the storage rod. Although the pneumatic cement grouting pump still uses a pulse-type pumping method, the storage rod has the functions of storing, buffering, pressure build-up, and pressurizing, which is sufficient to ensure stable and continuous discharge from the discharge port of the built-in discharge nozzle. This enables uninterrupted continuous spraying of the thin-film coating material.

[0029] The air outlet gap is 3mm wide, which can enhance the speed and pressure of the compressed air ejected from the external air nozzle, ensuring the spraying and dispersing effect of the compressed air on the thin spray coating, so that the thin spray coating ejected from the spray gun can be sprayed more evenly and smoothly on the inner wall of the underground roadway.

[0030] The built-in discharge nozzle uses a ceramic tube, which has an anti-static effect, preventing electrostatic sparking and meeting the safety and explosion-proof requirements of coal mines. It also helps to improve the wear resistance of the built-in discharge nozzle to compressed air, because the high-speed airflow friction between compressed air and the built-in discharge nozzle may generate static electricity and also have a strong abrasive effect on the built-in discharge nozzle.

[0031] The front end of the built-in discharge nozzle is threadedly connected to the discharge end of the storage rod, which facilitates the disassembly and replacement of the built-in discharge nozzle to adjust the size of the thin-film coating discharge port and control the amount and speed of thin-film coating discharge.

[0032] The front end of the external air blowing nozzle is threadedly connected to the front end of the built-in discharge nozzle, which facilitates the disassembly and replacement of the external air blowing nozzle, so as to adjust the size of the compressed air outlet gap and control the compressed air pressure and blowing speed.

[0033] Example 2

[0034] Based on Example 1, the external air blowing nozzle is composed of two parts, a front nozzle and a rear nozzle, which are coaxially screwed together. The size of the compressed air outlet gap can be adjusted by simply replacing the rear half of the external air blowing nozzle, which is more convenient and faster.

[0035] The technical solution of this utility model is not limited to the specific embodiments described above. Without departing from the scope and spirit of the described embodiments, many modifications and changes will be obvious to those skilled in the art. Any technical modifications made within the spirit and principles of this utility model shall fall within the protection scope of this utility model.

Claims

1. A continuous thin-film spraying device for mining, comprising a pneumatic cement grouting pump and a long-handled spray gun assembly, wherein the pneumatic cement grouting pump includes a slurry tank for storing the thin-film spraying material, and a pneumatic stirring motor and a pneumatic grouting pump installed above the slurry tank; a stirring paddle is connected to the lower end of the output shaft of the pneumatic stirring motor; a filter screen is provided at the lower end of the suction pipe of the pneumatic grouting pump; both the stirring paddle and the filter screen are positioned below the surface of the thin-film spraying material in the slurry tank; and the discharge end of the pneumatic grouting pump is connected to the long-handled spray gun assembly via a conveying hose, characterized in that: The long rod spray gun assembly includes a storage rod and a dispersing nozzle. The storage rod is a section of circular steel pipe. The inlet end of the storage rod is connected to the conveying hose of the pneumatic grouting pump, and the dispersing nozzle is installed on the outlet end of the storage rod. The dispersion nozzle includes a cylindrical internal discharge nozzle and a cylindrical external air blowing nozzle. The front end of the internal discharge nozzle is connected to the discharge end of the storage rod. The rear end of the internal discharge nozzle is provided with an outlet for spraying thin spray paint. The external air blowing nozzle is coaxially sleeved on the outside of the internal discharge nozzle. A hollow interlayer is provided between the external air blowing nozzle and the internal discharge nozzle. An air inlet connector for connecting an external compressed air pipe is installed on the side wall of the hollow interlayer. The front end of the external air blowing nozzle is sealed and fixed to the front end of the internal discharge nozzle. An annular air outlet gap connected to the hollow interlayer is provided between the rear end of the external air blowing nozzle and the rear end of the internal discharge nozzle for spraying and dispersing the thin spray paint sprayed from the internal discharge nozzle.

2. The continuous thin-film spraying device for mining according to claim 1, characterized in that: The storage rod is a steel pipe with a length of ≥1m and an inner diameter of 25-40mm.

3. A continuous thin-film spraying device for mining according to claim 2, characterized in that: The inner diameter of the discharge port of the built-in discharge nozzle is 6-10 mm.

4. A continuous thin-film spraying device for mining according to claim 1, characterized in that: The width of the air outlet gap is 2-4 mm.

5. A continuous thin-film spraying device for mining according to claim 3, characterized in that: The built-in discharge nozzle uses a ceramic tube.

6. A continuous thin-film spraying device for mining according to claim 1, characterized in that: The front end of the built-in discharge nozzle is threadedly connected to the discharge end of the storage rod.

7. A continuous thin-film spraying device for mining according to claim 6, characterized in that: The front end of the external air blowing nozzle is threadedly connected to the front end of the internal discharge nozzle.

8. A continuous thin-film spraying device for mining according to claim 7, characterized in that: The external air nozzle is composed of two parts: a front nozzle and a rear nozzle, which are coaxially screwed together.

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