A pneumatic device for preparing a foam

Abstract

The utility model relates to a kind of preparation of foaming pneumatic device, including foam mucus tank, foam solution tank, liquid storage tank and gas connection pipe, gas connection pipe connects external compressed gas gas source;The bottom of the liquid storage tank is fixed with several foam generators, the top of foam generator is equipped with air inlet end and liquid inlet end, the bottom is equipped with the bubble outlet controlled by bubble outlet solenoid valve, air inlet end is fixedly connected to the top of liquid storage tank by pipeline and the top of pipeline is equipped with air inlet hole;Between foam mucus tank and foam solution tank, between foam solution tank and liquid storage tank, pump body is equipped, gas connection pipe is connected to liquid storage tank and two pump bodies by three branch pipes respectively;Liquid outlet pipeline of foam mucus tank and foam solution tank is equipped with liquid sending valve.The utility model converts foam mucus into foam body with compressed gas as power, realizes automatic preparation process by the cooperation of several solenoid valves and pump body;Foam solution and gas enter foam generator to generate foam and release through bubble outlet to reduce dust.

Description

Technical Field

[0001] This utility model belongs to the field of dust control technology, and is specifically applied to dust control in occupational health and explosion-proof fields such as coal mines and non-coal mines. In particular, it relates to a pneumatic device for preparing foam. Background Technology

[0002] Mineral raw materials, as a crucial cornerstone of the national economy, play an irreplaceable role in my country. Statistics show that in 2023, my country consumed approximately 6 billion tons of mineral raw materials, supporting about 60% of its GDP. However, the mining, crushing, transportation, and processing of mineral raw materials inevitably generate large amounts of dust, which poses a serious threat to operational safety, the occupational health of workers, and the surrounding ecological environment.

[0003] Currently, there is a significant gap between the dust concentration standards for workplaces in my country and the actual dust levels in production environments. For example, according to the national standard "Emission Standard of Pollutants for Iron Ore Mining and Processing Industry (GB 28661-2012)," the limit for particulate matter in workplaces is 20 mg / m³. 3 However, in actual production, the dust concentration during rock drilling and blasting processes can reach as high as 308 mg / m³. 3 and 800mg / m 3 This far exceeds national standards. Similarly, the revised "Coal Mine Safety Regulations" of 2022 require that the total dust and respirable dust concentrations in the workplace not exceed 4 mg / m³. 3 and 2.5 mg / m 3 However, the average coal dust concentration at the coal mining face, transfer point, and tunneling face in underground mines still reached 16.85 mg / m³. 3 10.72 mg / m 3 and 4 mg / m 3 Dust levels are generally exceeding standards. The situation is equally severe in open-pit mines, where the instantaneous dust concentration at the gyratory crushing operation point can even reach 460 mg / m³. 3 It is particularly noteworthy that open-pit mining accounts for as much as 90%, 52%, and 23% of my country's iron ore, non-ferrous metals, and coal production, respectively, making dust control in open-pit mines a more prominent and widespread problem.

[0004] The hazards of dust are multifaceted. First, it directly harms the health of workers. In 2023, among newly reported occupational disease cases nationwide, occupational pneumoconiosis accounted for 8,051 cases, or 66.6%, making it the most prevalent occupational disease. Second, dust dispersed during production processes leads to air pollution in surrounding areas, severely impacting the quality of life for residents. Furthermore, dust accumulated on mining roads is repeatedly stirred up by vehicles, exacerbating air pollution and posing a potential risk to road traffic safety.

[0005] Among various mineral mining operations, dust control in coal mines presents a particularly significant challenge. Core processes such as fully mechanized mining and tunneling generate massive amounts of dust. Currently, the industry primarily relies on traditional technologies such as negative pressure ventilation and water spraying for dust suppression. However, these technologies have significant limitations: underground working spaces are typically open and have high ventilation volumes, resulting in limited dust removal effectiveness from negative pressure ventilation; and water spraying is less effective at wetting fine dust particles, as water droplets often fail to effectively capture dust particles and may even cause dust dispersion due to water flow disturbance, increasing the pollution area. Therefore, achieving efficient dust suppression, especially respirable dust, in the confined space and explosion-proof environment of underground mines remains a pressing technical challenge to be solved in this field.

[0006] To address these challenges, the industry urgently needs to develop a new type of dust removal equipment and technology that can overcome the shortcomings of existing technologies, is suitable for complex mining environments, and has higher dust reduction efficiency. Utility Model Content

[0007] This invention provides a pneumatic device for preparing foam to solve the technical problems of dust control in mines in the prior art. It uses compressed gas as power to convert foam viscous liquid into foam body, and realizes the automatic preparation process through the cooperation of several solenoid valves and pump body.

[0008] This utility model includes the following technical solution: a pneumatic device for preparing foam, comprising a foam slime tank, a foam solution tank, a storage tank, and an air inlet pipe, the air inlet pipe being connected to an external compressed gas source; several foam generators are fixedly installed at the bottom of the storage tank, each foam generator having an air inlet and a liquid inlet at the top, and a foam outlet controlled by a foaming solenoid valve at the bottom; the air inlet is fixedly connected to the top of the storage tank via a pipe, and the top of the pipe has an air inlet hole; pumps are provided between the foam slime tank and the foam solution tank, and between the foam solution tank and the storage tank; the air inlet pipe is connected to the storage tank and the two pumps respectively via three branch pipes; a liquid delivery valve is provided on the liquid outlet pipes of the foam slime tank and the foam solution tank.

[0009] Furthermore, the air inlet pipe is equipped with a main air inlet valve.

[0010] Furthermore, the foam solution tank is equipped with a level gauge, and the foam solution tank is marked with a high level and a low level; the top of the storage tank is equipped with a radar level gauge, and the storage tank is marked with a high level and a low level.

[0011] Furthermore, the outlet pipe of the foam slime box is equipped with a first liquid delivery valve, and the outlet pipe of the foam solution box is equipped with a second liquid delivery valve.

[0012] Furthermore, the pump body is a pneumatic diaphragm pump, a metering pump, or a multistage pump, and the pump body can be operated by electric control.

[0013] Furthermore, the pump body between the foam slime tank and the foam solution tank is a first pneumatic diaphragm pump, and its air inlet pipe is equipped with a first air inlet valve and a first pressure reducing valve; the pump body between the foam solution tank and the storage tank is a second pneumatic diaphragm pump, and its air inlet pipe is equipped with a second air inlet valve.

[0014] Furthermore, the first pressure-reducing valve is located at the air inlet of the first pneumatic diaphragm pump, and the branch pipe between the air inlet pipe and the storage tank is connected to the top of the storage tank and equipped with a second pressure-reducing valve. The output flow rate of the foamy viscous liquid can be controlled by adjusting the air pressure of the first pressure-reducing valve.

[0015] Furthermore, the top of the storage tank is equipped with a pressure relief valve and an external liquid inlet pipe, with a third liquid delivery valve on the external liquid inlet pipe. Liquid can be directly added to the storage tank through the external liquid inlet pipe. The pressure relief valve, the third liquid delivery valve, and the radar level gauge are all fixedly installed on the top of the storage tank by threads.

[0016] Furthermore, the pipeline between the second pneumatic diaphragm pump and the storage tank is connected to the bottom side of the storage tank, and the bottom of the storage tank is also provided with a drain pipe, which is equipped with an air vent valve.

[0017] Furthermore, the liquid delivery pipe between the first pneumatic diaphragm pump and the foam solution tank is connected to the water replenishment pipe, and the water replenishment pipe is equipped with a water replenishment solenoid valve and a flow meter in sequence along the liquid inlet direction.

[0018] Furthermore, the first liquid delivery valve, second liquid delivery valve, third liquid delivery valve, first pressure reducing valve, second pressure reducing valve, first air inlet valve, second air inlet valve, main air inlet valve, vent valve, and pressure relief valve are all solenoid valves powered by 24V DC voltage. The first and second pneumatic diaphragm pumps, flow meter, level gauge, radar level gauge, and all solenoid valves are connected to the control system for unified automatic control. The flow meter, level gauge, and radar level gauge are all powered by 24V DC voltage.

[0019] The advantages and positive effects of this utility model are as follows: This invention uses compressed gas as power. After the gas inlet pipe is connected to external compressed gas, it is connected to the pump body in sequence through the first inlet valve and the first pressure reducing valve. Adjusting the gas pressure of the first pressure reducing valve can control the output flow rate of the foam viscous liquid. It is connected to the pump body through the second inlet valve and to the top of the storage tank through the second pressure reducing valve. The compressed gas provides power to the two pump bodies and the foam solution in the storage tank.

[0020] The foam solution of this invention is input into the storage tank through the pump body. The gas in the storage tank enters the foam generator through the air inlet and pipe. The foam solution in the storage tank enters the foam generator through another inlet. After the gas and liquid generate foam in the foam generator, it is sprayed out from the foam outlet through the foam outlet solenoid valve.

[0021] The water replenishment solenoid valve of this utility model is connected to the on-site water circuit through a water replenishment pipe. According to the output of foam slurry, the ratio can be adjusted proportionally based on the display value of the flow meter, so that foam slurry and water can be added to the foam solution tank in proportion.

[0022] This invention utilizes a radar level gauge to detect when the liquid level in the storage tank reaches the low level and opens the second air inlet valve to control the pump to replenish the tank. When the liquid level in the storage tank reaches the high level, the second air inlet valve is closed. Similarly, when the level gauge detects when the liquid level in the foam solution tank reaches the low level, the water replenishment solenoid valve, the first liquid delivery valve, and the first air inlet valve are opened to replenish the foam solution tank. When the liquid level in the foam solution tank reaches the high level, the water replenishment solenoid valve, the first liquid delivery valve, and the first air inlet valve are closed, thereby achieving fully automatic liquid inlet control. Attached Figure Description

[0023] Figure 1 This is the front view of this utility model; In the diagram, 1-foam slime tank; 2-water replenishment solenoid valve; 3-flow meter; 4-first liquid delivery valve; 5-first pneumatic diaphragm pump; 6-first pressure reducing valve; 7-first air inlet valve; 8-main air inlet valve; 9-level gauge; 10-Foam solution tank; 11-High liquid level in solution tank; 12-Low liquid level in solution tank; 13-Second liquid delivery valve; 14-Second pneumatic diaphragm pump; 15-Second air inlet valve; 16-Second pressure reducing valve; 17-Storage tank; 18-Pressure relief valve; 19-Third liquid delivery valve; 20-Radar level gauge; 21-Storage tank high level; 22-Storage tank low level; 23-Drain valve; 24-First foam generator; 25-Second foam generator; 26-Third foam generator; 27-Fourth foam generator; 28-Fifth foam generator; 29-Sixth foam generator; 30-First bubble-out solenoid valve; 31-Second bubble-out solenoid valve; 32-Third bubble-out solenoid valve; 33-Fourth bubble-out solenoid valve; 34-Fifth bubble-out solenoid valve; 35-Sixth bubble-out solenoid valve; 36-Gas inlet pipe. Detailed Implementation

[0024] To further disclose the invention content, features, and effects of this utility model, the following examples are provided in conjunction with the accompanying drawings for detailed description. In the following description of the embodiments, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this patent and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this patent.

[0025] In the following description of the embodiments, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0026] Example: See Appendix Figure 1 A pneumatic device for preparing foam includes a foam slime tank 1, a foam solution tank 10, a storage tank 17, and an air inlet pipe 36, which is connected to an external compressed gas source; the air inlet pipe 36 is equipped with an air inlet main valve 8. The bottom of the storage tank 17 is fixedly equipped with a first foam generator 24, a second foam generator 25, a third foam generator 26, a fourth foam generator 27, a fifth foam generator 28, and a sixth foam generator 29. Each foam generator has an air inlet and a liquid inlet at the top, and six foam outlets at the bottom, controlled by a first foaming solenoid valve 30, a second foaming solenoid valve 31, a third foaming solenoid valve 32, a fourth foaming solenoid valve 33, a fifth foaming solenoid valve 34, and a sixth foaming solenoid valve 35. The air inlet is fixedly connected to the top of the storage tank 17 through a pipe, and the top of the pipe has an air inlet hole. Pumps are installed between the foam slime tank 1 and the foam solution tank 10, and between the foam solution tank 10 and the storage tank 17. The pumps are pneumatic diaphragm pumps, metering pumps, or multistage pumps, and can be operated electrically.

[0027] In this example, a pneumatic diaphragm pump is selected. The pump body between the foam slime tank 1 and the foam solution tank 10 is a first pneumatic diaphragm pump 5, which is equipped with a first air inlet valve 7 and a first pressure reducing valve 6 on its air inlet pipe. The pump body between the foam solution tank 10 and the storage tank 17 is a second pneumatic diaphragm pump 14, which is equipped with a second air inlet valve 15 on its air inlet pipe. The liquid delivery pipe between the first pneumatic diaphragm pump 5 and the foam solution tank 10 is connected to a water supply pipe, and a water supply solenoid valve 2 and a flow meter 3 are sequentially installed on the water supply pipe along the liquid inlet direction. The pipe between the second pneumatic diaphragm pump 14 and the storage tank 17 is connected to the bottom side of the storage tank 17. The bottom of the storage tank 17 is also equipped with a drain pipe, which is equipped with an emptying valve 23.

[0028] The air inlet pipe 36 is connected to the storage tank 17 and two pump bodies via three branch pipes. The outlet pipes of the foam slime tank 1 and the foam solution tank 10 are respectively equipped with a first delivery valve 4 and a second delivery valve 13. The first pressure reducing valve 6 is located at the air inlet of the first pneumatic diaphragm pump 5. The branch pipe between the air inlet pipe 36 and the storage tank 17 is connected to the top of the storage tank 17 and is equipped with a second pressure reducing valve 16. The output flow rate of the foam slime can be controlled by adjusting the air pressure of the first pressure reducing valve 6.

[0029] The foam solution tank 10 is equipped with a level gauge 9, and the foam solution tank 10 is equipped with a high level 11 and a low level 12. The top of the storage tank 17 is equipped with a radar level gauge 20, and the storage tank 17 is equipped with a high level 21 and a low level 22.

[0030] The top of the liquid storage tank 17 is also equipped with a pressure relief valve 18 and an external liquid inlet pipe, and a third liquid delivery valve 19 is provided on the external liquid inlet pipe. Liquid can be added directly to the liquid storage tank 17 through the external liquid inlet pipe. The pressure relief valve 18, the third liquid delivery valve 19, and the radar level gauge 20 are respectively fixedly installed on the top of the liquid storage tank 17 by threads.

[0031] The first liquid delivery valve 4, the second liquid delivery valve 13, the third liquid delivery valve 19, the first pressure reducing valve 6, the second pressure reducing valve 16, the first air inlet valve 7, the second air inlet valve 15, the main air inlet valve 8, the vent valve 23, and the pressure relief valve 18 are all solenoid valves powered by 24V DC voltage. The first pneumatic diaphragm pump 5 and the second pneumatic diaphragm pump 14, the flow meter 3, the level gauge 9, the radar level gauge 20, and all solenoid valves are connected to the control system for unified automatic control. The flow meter 3, the level gauge 9, and the radar level gauge 20 are all powered by 24V DC voltage.

[0032] In this example, six foam generators are used (i.e., the first foam generator 24, the second foam generator 25, the third foam generator 26, the fourth foam generator 27, the fifth foam generator 28, and the sixth foam generator 29). More can be connected as needed. In actual use, the corresponding number of nozzles can be opened as needed without opening all nozzles.

[0033] Work process: Solution preparation process: When the radar level gauge 20 detects that the liquid level in the storage tank 17 has reached the low level 22, the second air inlet valve 15 is opened to control the second pneumatic diaphragm pump 14 to replenish the tank. When the liquid level in the storage tank 17 reaches the high level 21, the second air inlet valve 15 is closed. When the level gauge 9 detects that the liquid level in the foam solution tank 10 has reached the low level 12, the water replenishment solenoid valve 2, the first liquid delivery valve 4, and the first air inlet valve 7 are opened to replenish the foam solution tank 10. Foam solution; the water replenishment solenoid valve 2 is connected to the on-site water and to the foam solution tank 10 via the flow meter 3. The rear end of the flow meter 3 is connected to the outlet end of the first pneumatic diaphragm pump 5. The mixing ratio is adjusted according to the display value of the flow meter 3 to add foam viscous liquid and water to the foam solution tank 10 in proportion. When the liquid level in the foam solution tank 10 reaches the high liquid level 11, the water replenishment solenoid valve 2, the first liquid delivery valve 4, and the first air inlet valve 7 are closed, thereby realizing fully automatic liquid inlet control. The first pneumatic diaphragm pump 5 and the second pneumatic diaphragm pump 14 are powered by compressed gas. The air inlet pipe 36 is connected to the external compressed gas and is connected to the first air inlet valve 7 and the second air inlet valve 15 respectively through the main air inlet valve 8 to control the operation of the first pneumatic diaphragm pump 5 and the second pneumatic diaphragm pump 14.

[0034] Foaming process: The gas in the storage tank 17 enters the first foam generator 24, the second foam generator 25, the third foam generator 26, the fourth foam generator 27, the fifth foam generator 28, and the sixth foam generator 29 through the air inlet. The foam solution in the storage tank 17 enters the foam generator through another inlet of the above foam generators. After the gas and liquid generate foam in the above foam generators, it is sprayed out from the foam outlet through the first foam outlet solenoid valve 30, the second foam outlet solenoid valve 31, the third foam outlet solenoid valve 32, the fourth foam outlet solenoid valve 33, the fifth foam outlet solenoid valve 34, and the sixth foam outlet solenoid valve 35.

[0035] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other modifications under the guidance of the present invention without departing from the spirit and scope of the claims. These modifications all fall within the protection scope of the present invention.

Claims

1. A pneumatic device for preparing foam, characterized in that: The system includes a foam slime tank, a foam solution tank, a storage tank, and an air inlet pipe connected to an external compressed gas source. Several foam generators are fixedly mounted at the bottom of the storage tank. Each foam generator has an air inlet and a liquid inlet at the top, and a foam outlet controlled by a solenoid valve at the bottom. The air inlet is fixedly connected to the top of the storage tank via a pipe, and the pipe has an air inlet hole at the top. Pumps are installed between the foam slime tank and the foam solution tank, and between the foam solution tank and the storage tank. The air inlet pipe is connected to the storage tank and the two pumps via three branch pipes. A liquid delivery valve is installed on the liquid outlet pipes of both the foam slime tank and the foam solution tank.

2. The pneumatic device for preparing foam according to claim 1, characterized in that: The air inlet pipe is equipped with a main air inlet valve.

3. The pneumatic device for preparing foam according to claim 1, characterized in that: The foam solution tank is equipped with a level gauge, and the foam solution tank has a high level and a low level indicator; the top of the storage tank is equipped with a radar level gauge, and the storage tank has a high level and a low level indicator.

4. The pneumatic device for preparing foam according to claim 1, characterized in that: The foam mucus tank has a first liquid delivery valve on its outlet pipe, and the foam solution tank has a second liquid delivery valve on its outlet pipe.

5. The pneumatic device for preparing foam according to claim 1, characterized in that: The pump body is a pneumatic diaphragm pump, a metering pump, or a multistage pump.

6. The pneumatic device for preparing foam according to claim 5, characterized in that: The pump body between the foam slime tank and the foam solution tank is a first pneumatic diaphragm pump, and its air inlet pipe is equipped with a first air inlet valve and a first pressure reducing valve; the pump body between the foam solution tank and the storage tank is a second pneumatic diaphragm pump, and its air inlet pipe is equipped with a second air inlet valve.

7. A pneumatic device for preparing foam according to claim 6, characterized in that: The first pressure reducing valve is located at the air inlet of the first pneumatic diaphragm pump, and the branch pipe between the air inlet pipe and the liquid storage tank is connected to the top of the liquid storage tank and is equipped with a second pressure reducing valve.

8. A pneumatic device for preparing foam according to claim 7, characterized in that: The top of the storage tank is also equipped with a pressure relief valve and an external liquid inlet pipe, and a third liquid delivery valve is provided on the external liquid inlet pipe.

9. A pneumatic device for preparing foam according to claim 6, characterized in that: The pipeline between the second pneumatic diaphragm pump and the storage tank is connected to the bottom side of the storage tank. The bottom of the storage tank is also equipped with a drain pipe with an emptying valve.

10. A pneumatic device for preparing foam according to claim 6, characterized in that: The liquid delivery pipeline between the first pneumatic diaphragm pump and the foam solution tank is connected to the water replenishment pipeline, and the water replenishment pipeline is equipped with a water replenishment solenoid valve and a flow meter in sequence along the liquid inlet direction.

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