A coal mine grouting fire prevention and extinguishing slurry preparation equipment

Abstract

This utility model discloses a coal mine grouting and fire extinguishing slurry preparation device, relating to the field of coal mine fire prevention and extinguishing technology. It solves the problems of low mixing efficiency and poor uniformity of fire extinguishing slurries. A primary mixing chamber is located below the feed hopper, containing a primary mixing shaft with multiple primary mixing blades. Below the primary mixing chamber is a secondary mixing chamber, with the slurry outlet located below it. The secondary mixing chamber contains a secondary mixing shaft with multiple secondary mixing blades. Above the secondary mixing shaft is a pulse rotor shaft, containing a pulse gas channel and multiple pulse gas outlets connected to the pulse gas channel. This utility model, when applied to coal mine fire prevention and extinguishing scenarios, can improve the efficiency and reliability of coal mine fire prevention and extinguishing operations, ensuring the safety and stability of coal mine production.

Description

Technical Field

[0001] This utility model relates to the field of coal mine fire prevention and extinguishing technology, and in particular to a coal mine grouting fire prevention and extinguishing slurry preparation equipment. Background Technology

[0002] Coal mine safety has always been a crucial issue in industrial production, including the prevention and suppression of coal mine fires. Coal mine fires not only cause enormous economic losses but also threaten the lives of miners and can even severely damage the surrounding environment.

[0003] Common fire prevention and extinguishing measures in coal mines include grouting, inert gas slurry, pressure equalization ventilation, and spraying of fire inhibitors. Among these, grouting is widely used as an economical and effective method. The core technical principle of grouting involves a dual mechanism of physical isolation and thermodynamic control: water in the grout absorbs heat through evaporation, lowering the coal temperature; and the remaining solid material after dehydration forms an oxygen barrier layer, preventing coal oxidation. The technical route of grouting involves mixing non-combustible solid materials with water to form a suspension grout using fire-prevention slurry preparation equipment, which is then injected into the goaf or fire source area via grout delivery pipelines to achieve fire prevention and extinguishing.

[0004] However, existing fire extinguishing slurry preparation equipment still has some problems that urgently need to be solved in practical applications: Chinese patent document CN202659272U discloses a coal mine grouting fire prevention and extinguishing slurry making machine. The slurry making machine provided has a relatively simple stirring method. The single-stage stirring impeller is difficult to fully disperse large particles or clumps in the material, resulting in uneven slurry making effect and affecting the quality of the slurry.

[0005] Chinese patent document CN202187790U discloses a continuous mud preparation machine for coal mine fire prevention and extinguishing. It achieves the preparation and separation of slurry through stirring plates and spiral guide plates inside the drum. However, this structure is prone to problems of insufficient and uneven mixing when processing materials such as fly ash. In particular, the slurry preparation efficiency is low for high viscosity or difficult-to-disperse materials.

[0006] Chinese patent document CN201433785Y discloses a cage-type pulping machine for coal mine fire prevention and extinguishing, which uses a cage-type drum as its core component and separates the slurry from the residue through a filter screen around the drum. However, during the mixing process, the material easily forms dead zones inside the drum, resulting in some materials not being fully mixed and dissolved, affecting the overall performance of the slurry. Moreover, the equipment has poor adaptability to materials, and is prone to problems such as poor mixing effect or clogging when processing materials with high or low moisture content.

[0007] In summary, existing coal mine grouting fire prevention and extinguishing slurry preparation equipment has significant shortcomings in terms of mixing efficiency and slurry uniformity. These problems limit the further development and application of grouting fire prevention and extinguishing technology in the field of coal mine safety. There is an urgent need for a new type of slurry preparation equipment that can effectively solve these problems, thereby improving the efficiency and reliability of coal mine fire prevention and extinguishing work and ensuring the safety and stability of coal mine production. Utility Model Content

[0008] To address one or more technical problems in the prior art, this utility model provides a coal mine grouting fire prevention and extinguishing slurry preparation device: Includes the feed hopper and slurry outlet; Below the feed hopper is a primary mixing chamber, inside which is a primary mixing shaft, and on the primary mixing shaft are multiple primary mixing blades; Below the primary mixing chamber is a secondary mixing chamber, and the slurry outlet is located below the secondary mixing chamber. Inside the secondary mixing chamber is a secondary mixing shaft with multiple secondary mixing blades. Above the secondary mixing shaft is a pulse rotor shaft with a pulse gas channel inside and multiple pulse gas outlets communicating with the pulse gas channel outside the pulse rotor shaft.

[0009] Preferably, the feed hopper is equipped with a vibrating screen.

[0010] Preferably, the vibrating screen is provided with a plurality of shock balls.

[0011] Preferably, a rotating dispersing shaft is provided above the primary stirring shaft, and the rotating dispersing shaft is provided with multiple material dispersing blades.

[0012] Preferably, the primary mixing chamber is connected to an impact air cannon, and the outlet of the impact air cannon extends into the interior of the primary mixing chamber.

[0013] Preferably, the impact air gun includes an air storage chamber, which is connected to the air outlet via a first valve and to the air inlet of the impact air gun via a second valve. The air inlet is used for compressed air input.

[0014] Preferably, the pulse gas outlet is connected to a one-way valve or a solenoid valve to prevent the slurry in the secondary stirring chamber from flowing back into the pulse gas channel.

[0015] Preferably, the primary mixing chamber is also connected to a waste discharge port.

[0016] Preferably, the secondary mixing chamber is further equipped with a slurry concentration detector.

[0017] Preferably, the interior of the secondary mixing chamber is also equipped with a slurry level detector.

[0018] The beneficial effects of this utility model are: This invention, by setting up a primary and a secondary mixing chamber, along with primary and secondary mixing blades, enables the gradual dispersion and fine mixing of materials. By incorporating a pulse rotor shaft, it can release pulse gas at regular intervals or in a timely manner, suspending and thoroughly mixing the materials. The synergistic effect of multi-stage mixing and pulse gas effectively improves slurry mixing efficiency, ensuring the uniformity and high quality of the slurry, and significantly enhancing the efficiency and reliability of coal mine fire prevention and extinguishing. Attached Figure Description

[0019] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0020] Figure 1 This is a schematic diagram of the internal structure of a coal mine grouting fire prevention and extinguishing slurry preparation equipment according to an embodiment of the present utility model; Figure 2 yes Figure 1 Enlarged view of point A in the middle; Figure 3 yes Figure 1 Enlarged view of point B in the middle.

[0021] In the picture: 1. Feed hopper; 11. Vibrating screen; 12. Vibrating balls; 2. Slurry outlet; 3. Primary mixing chamber; 31. Primary mixing shaft; 311. Primary mixing blades; 32. Rotary dispersing shaft; 321. Material dispersing blades; 4. Secondary mixing chamber; 41. Secondary mixing shaft; 411. Secondary mixing blades; 42. Pulse rotor shaft; 421. Pulse gas outlet; 43. Slurry concentration detector; 44. Slurry level detector; 5. Impact air cannon; 51. Air outlet; 52. Air storage chamber; 53. First valve; 54. Second valve; 55. Air inlet; 6. Waste discharge outlet; 7. Drive motor. Detailed Implementation

[0022] Fire prevention and extinguishing slurry preparation equipment can be used to produce yellow mud slurry, fly ash slurry, thickened colloids, etc., for grouting fire prevention and extinguishing. Taking the application of fly ash slurry in grouting fire prevention and extinguishing as an example, although it has advantages such as wide availability of materials, low cost, and high economic benefits, it also has technical problems such as easy settling and pipe blockage of the slurry product. The coal mine grouting fire prevention and extinguishing slurry preparation equipment provided by this utility model can solve the technical problems of easy settling and pipe blockage of the slurry product by improving mixing efficiency and slurry uniformity.

[0023] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation of the present invention and not by way of limitation. In fact, those skilled in the art will recognize that modifications and variations can be made to the present invention without departing from the scope or spirit of the invention. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the present invention encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0024] In the description of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. The terms "connected," "linked," and "set up" used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0025] Example 1: like Figures 1-3 As shown, a coal mine grouting fire prevention and extinguishing slurry preparation equipment includes a feed hopper 1 and a slurry outlet 2; Below the feed hopper 1 is a primary mixing chamber 3, inside the primary mixing chamber 3 is a primary mixing shaft 31, and the primary mixing shaft 31 is provided with multiple primary mixing blades 311; Below the primary mixing chamber 3 is a secondary mixing chamber 4. The slurry outlet 2 is located below the secondary mixing chamber 4. Inside the secondary mixing chamber 4 is a secondary mixing shaft 41. Multiple secondary mixing blades 411 are provided on the secondary mixing shaft 41. Above the secondary mixing shaft 41 is a pulse rotor shaft 42. Inside the pulse rotor shaft 42 is a pulse gas channel. Outside the pulse rotor shaft 42 are multiple pulse gas outlets 421 that communicate with the pulse gas channel.

[0026] When the coal mine grouting fire prevention and extinguishing slurry preparation equipment is working, the material enters the primary mixing chamber 3 and the secondary mixing chamber 4 through the feed hopper 1 to be mixed. The pulse gas outlet 421 can be used to quickly release compressed air from the compressed air pipeline and the air storage tank to form pulse gas so that the slurry can roll fully and form a more uniform fire prevention and extinguishing slurry. The slurry outlet 2 is connected to the conveying device to transport the fire prevention and extinguishing slurry to the coal mine grouting fire prevention and extinguishing area.

[0027] Most existing pulping machines only have a single-stage stirring impeller, which makes it difficult to disperse the material, resulting in a large number of large particles / clumps of material in the formed slurry. To address this, this invention designs a primary stirring chamber 3 and a secondary stirring chamber 4.

[0028] In practice, the primary stirring blades 311 and the secondary stirring blades 411 can be structurally identical or differentiated. Since the primary stirring blades 311 on the primary stirring shaft 31 perform initial stirring of the material, they can be designed with larger blade sizes and spacing compared to the secondary stirring blades 411 to provide greater stirring force, enabling the initial breaking down of larger material pieces and propelling them within the primary stirring chamber 3. Conversely, since the secondary stirring blades 411 on the secondary stirring shaft 41 perform more refined stirring based on the primary stirring blades 311, they can be designed with smaller blade sizes and spacing compared to the primary stirring blades 311.

[0029] When the coal mine grouting fire prevention and extinguishing slurry preparation equipment of this utility model is connected to the existing PLC automatic control system, the pulse gas outlet 421 can send pulse gas at regular intervals or in a timely manner under the control of the PLC, so that the material is suspended and fully mixed. The bearings of the pulse rotor shaft 42 can meet the support stability and prevent the pulse shaft from deviating from the normal working position due to vibration.

[0030] Compared with existing technologies, this invention adopts a dual-stage mixing chamber design (primary mixing chamber 3 + secondary mixing chamber 4) combined with pulsed gas-assisted mixing. This design breaks through the limitations of traditional single-stage mixing impellers. Through the initial mixing of the primary mixing shaft 31 and the fine mixing of the secondary mixing shaft 41, combined with the suspension effect of pulsed gas, efficient and uniform mixing of materials can be achieved. This enables the slurry preparation equipment to produce more uniform and higher-quality fire extinguishing slurry, effectively solving the problem of poor slurry preparation effect of traditional equipment and improving the efficiency and reliability of coal mine fire prevention and extinguishing.

[0031] Example 2: Furthermore, a vibrating screen 11 is provided on the feed hopper 1.

[0032] In practice, the feed hopper 1 can be connected to a vibration generator to cause the vibrating screen 11 to vibrate. The vibration of the vibrating screen 11 can be achieved using traditional eccentric wheel mechanical vibration. Preferably, the vibrating screen 11 can be vibrated using an electromagnetic vibrator, which works by using the rapid attraction and release of an electromagnet to drive the vibrating screen 11 to vibrate at high frequency. This vibration helps the material fall evenly in the feed hopper 1, preventing material blockage, and simultaneously performs effective preliminary screening of the material, ensuring that only material meeting the particle size requirements enters the subsequent mixing chamber.

[0033] Example 3: Furthermore, the vibrating screen 11 is equipped with multiple shock balls 12.

[0034] In practice, when material falls onto the vibrating screen 11, the vibration balls 12 bounce under the drive of the vibrating screen 11, impacting material clumps and quickly breaking them up. The arrangement and number of vibration balls 12 can be adjusted according to the characteristics of the material and the working conditions. The vibration balls 12 can be placed on top of the screen or between two layers of screens. Vibration balls 12 placed on top of the screen can directly impact and break up the material; while vibration balls 12 placed between two layers of screens can further break up and screen the material as it passes through the screen.

[0035] Existing vibrating screens 11 typically rely solely on the vibration of the screen itself to screen materials. For highly viscous or easily agglomerated materials, the screening effect is often insufficient. This embodiment addresses this by incorporating impact balls 12 onto the vibrating screen 11. The bouncing and impact of these balls effectively break up material clumps, improving both screening efficiency and quality. By strategically arranging the impact balls 12—whether on top of the screen or between two screens—the pretreatment of materials is significantly improved, resulting in more uniform material entering the mixing chamber, which is beneficial for subsequent slurry preparation. This not only enhances slurry preparation efficiency but also improves slurry quality, positively impacting the effectiveness of coal mine grouting for fire prevention and extinguishing.

[0036] Example 4: Furthermore, a rotating dispersing shaft 32 is provided above the primary stirring shaft 31, and multiple material dispersing blades 321 are provided on the rotating dispersing shaft 32.

[0037] Existing coal mine grouting and fire-fighting slurry preparation equipment neglects the dispersing operation of materials immediately entering the primary mixing chamber 3, lacking a dedicated material dispersing device. This invention features a rotating dispersing shaft 32 positioned above the primary mixing shaft 31 and below the feed hopper 1. The material dispersing blades 321 on this shaft can be designed as vertical blades to enhance the dispersing effect. By adjusting the rotational speed of the rotating dispersing shaft 32 according to the properties of the material and the needs of the slurry preparation process, precise control of the degree of material dispersal can be achieved.

[0038] In practice, the rotation of the rotary dispersing shaft 32, the primary stirring shaft 31, the secondary stirring shaft 41, and the pulse rotor shaft 42 can all utilize the same power source, such as... Figure 1 The drive motor 7 shown in the diagram achieves different speed adjustments through gear ratios. Multiple motors can also be set up to control different shafts, and the speed can be adjusted to meet different stirring requirements. The frequency conversion control of the rotary dispersing shaft 32, the primary stirring shaft 31, the secondary stirring shaft 41, and the pulse rotor shaft 42 can be achieved using a frequency converter.

[0039] Example 5: Furthermore, the primary mixing chamber 3 is connected to an impact air cannon 5, and the air outlet 51 of the impact air cannon 5 extends into the interior of the primary mixing chamber 3.

[0040] In practical implementation, the impact air cannon 5 utilizes the rapid release of compressed air to generate impact force. The working principle of the impact air cannon 5 is to store compressed air and release it rapidly when needed, generating a strong airflow impact, thereby intensifying the tumbling of materials within the primary mixing chamber 3 and improving mixing efficiency. The structure of the impact air cannon 5 may include an air storage chamber 52, an air inlet 55, an air outlet 51, and control valves. When compressed air enters the air storage chamber 52 through the air inlet 55, it is rapidly released from the air outlet 51 after being regulated by the control valve, forming an impact airflow that acts on the materials, causing them to tumble and mix thoroughly.

[0041] Most existing mixing equipment relies on mechanical stirring to achieve material mixing, which is often insufficient for materials that are difficult to disperse. This invention introduces an impact air cannon 5, which enhances the tumbling and mixing effect of materials through the impact airflow, thereby improving stirring efficiency. The use of the impact air cannon 5 not only improves slurry production efficiency but also handles materials that traditional mechanical stirring struggles with, broadening the equipment's application range and playing a significant role in improving the efficiency and quality of fire prevention and extinguishing work in coal mines.

[0042] Example 6: Furthermore, the air cannon 5 includes an air storage chamber 52, which is connected to the air outlet 51 via a first valve 53, and the air storage chamber 52 is connected to the air inlet 55 of the air cannon 5 via a second valve 54. The air inlet 55 is used for compressed air input.

[0043] In practical implementation, the main function of the first valve 53 is to control the rapid release of compressed air from the storage chamber 52 to the outlet 51. It needs to have the ability to open and close quickly to generate a strong impact airflow; therefore, a solenoid valve can be used for the first valve 53. The second valve 54 is mainly used to regulate the flow rate and pressure of compressed air entering the storage chamber 52, ensuring a sufficient supply of compressed air within the storage chamber 52. Therefore, an electric shut-off valve, an electric regulating valve, or a solenoid valve can be used for the second valve 54. The storage chamber 52 can be made of metal to withstand high-pressure gas. During the inflation process, the first valve 53 is closed and the second valve 54 is opened. Compressed air enters the storage chamber 52 through the inlet 55 and the second valve 54 for storage. After inflation is complete, the second valve 54 is closed. When it is necessary to release the impact air, the first valve 53 is quickly opened, and the compressed air is rapidly released from the outlet 51, forming an impact airflow that acts on the material, thereby improving the mixing efficiency of the material.

[0044] Example 7: Furthermore, the pulse gas outlet 421 is connected to a check valve or a solenoid valve to prevent the slurry in the secondary stirring chamber 4 from flowing back into the pulse gas channel.

[0045] In practical implementation, the one-way valve is designed based on fluid mechanics principles, allowing only unidirectional gas flow. When pulsed gas is released from the pulsed gas channel, the one-way valve opens, allowing the gas to smoothly enter the secondary mixing chamber 4 through the pulsed gas outlet 421. When the slurry pressure in the secondary mixing chamber 4 exceeds the pressure in the pulsed gas channel, the one-way valve automatically closes to prevent slurry backflow. The solenoid valve is electrically controlled and can perform precise and rapid opening and closing operations according to the instructions of the PLC system, achieving precise control of pulsed gas release while preventing slurry backflow.

[0046] Example 8: Furthermore, the primary mixing chamber 3 is also connected to a waste discharge port 6.

[0047] In practice, after the equipment has been running for a period of time, the accumulated waste can be discharged from the waste discharge port 6 through the waste cleaning operation. For example, when the waste discharge port 6 is opened, the slurry outlet 2 is closed, and no new material is added, water is injected into the primary mixing chamber 3 and the secondary mixing chamber 4 for mixing. As the equipment runs, the pushing action of the blades of the primary mixing shaft 31 and the secondary mixing shaft 41 will push the waste towards the waste discharge port 6 for discharge.

[0048] This invention features a waste discharge port 6 to ensure timely discharge of waste. This not only helps improve the uniformity and quality of the slurry but also helps protect downstream equipment from wear and blockage caused by waste, thereby enhancing the reliability and stability of the entire fire prevention and extinguishing system.

[0049] Example 9: Furthermore, the secondary mixing chamber 4 is also equipped with a slurry concentration detector 43.

[0050] In practical use, the slurry concentration detector 43 can be selected from existing technologies such as ultrasonic concentration meters, optical concentration sensors or conductivity concentration meters.

[0051] Ultrasonic concentration meters measure slurry concentration based on the principle that the propagation speed of ultrasound in slurry is related to the slurry concentration. When ultrasound propagates in slurry, its speed is affected by the content of solid particles in the slurry. By measuring the propagation time or frequency change of ultrasound, the slurry concentration can be calculated.

[0052] Optical concentration sensors utilize optical principles such as light scattering, absorption, or refraction to detect slurry concentration. When light passes through slurry, particles in the slurry scatter or absorb the light, and there is a certain relationship between the intensity of the scattered or absorbed light and the slurry concentration. By measuring the intensity of the scattered or absorbed light, the slurry concentration can be determined.

[0053] The working principle of a conductivity concentration meter is based on the relationship between the conductivity and concentration of slurry. The concentration of slurry is calculated by measuring the conductivity of the slurry.

[0054] Combined with the PLC control system, the slurry concentration detector 43 can feed back the detected concentration data to the PLC in real time. The PLC automatically adjusts parameters such as the rotation speed of the stirring shaft, the release frequency of the pulse gas, and the feeding speed according to the preset concentration range and slurry preparation requirements, so as to achieve intelligent control and ensure that the slurry concentration always meets the requirements of coal mine grouting for fire prevention and extinguishing.

[0055] Example 10: Furthermore, the secondary mixing chamber 4 is also equipped with a slurry level detector 44.

[0056] In practice, the slurry level detector 44 can be an ultrasonic level gauge, radar level gauge or capacitive level gauge from the existing technology.

[0057] An ultrasonic level gauge measures the liquid level by emitting ultrasonic waves towards the surface of the slurry and receiving the reflected waves. It calculates the liquid level height by utilizing the speed and time of propagation of ultrasonic waves in the air.

[0058] Radar level gauge: The radar level gauge uses electromagnetic waves (radar waves) to measure the liquid level. It determines the liquid level height by emitting radar waves to the surface of the slurry and receiving the reflected waves based on the propagation time difference of the radar waves.

[0059] Capacitive level gauge: A capacitive level gauge measures liquid level based on the principle of capacitance change. When the liquid level of the slurry changes, the capacitance between the electrodes of the capacitive level gauge and the slurry also changes accordingly. The liquid level is determined by measuring the change in capacitance.

[0060] Combined with the PLC system, the PLC control system can receive signals from the slurry level detector 44 to monitor the liquid level in the secondary mixing chamber 4 in real time, and accordingly control the stirring speed of the stirring shaft, the release of pulse gas, the feed rate, and the discharge rate.

[0061] Taking the preparation of fly ash fire extinguishing slurry as an example, based on the technical solutions provided in the above embodiments, the coal mine fire extinguishing slurry preparation equipment of this utility model can be operated as follows during specific use: Feeding and initial dispersing operation: Fly ash material is poured into the feed hopper 1. Under the action of vibrating screen 11 and shock ball 12, the material clumps are initially dispersed to prevent large pieces of material from directly entering the mixing system.

[0062] Dispersion and mixing operation of primary mixing chamber 3: The material falling from the feed hopper 1 enters the primary mixing chamber 3 and is further dispersed by the rotating dispersing shaft 32 to ensure the initial uniformity of the material.

[0063] The mixing operation of the primary mixing shaft 31: The material dispersed by the rotating dispersing shaft 32 is fully mixed by the primary mixing blades 311 on the primary mixing shaft 31 to ensure uniform mixing and stability of the subsequent pulping process.

[0064] Auxiliary operation of impact gas cannon 5: High-pressure impact gas is sent into primary mixing chamber 3 through the outlet 51 of impact gas cannon 5 for auxiliary mixing.

[0065] Secondary mixing chamber 4 mixing operation: After primary mixing, the material enters the secondary mixing chamber 4. The secondary mixing blades 411 on the secondary mixing shaft 41, through a tumbling action, lift the material and flip it towards the top of the secondary mixing chamber 4. This tumbling mixing method helps to further mix the materials and improve the uniformity of the slurry.

[0066] Auxiliary operation of pulse rotor shaft 42: For materials in the secondary mixing chamber 4, the pulse gas outlet 421 on the pulse rotor shaft 42 can send electronic pulse gas at regular intervals under the control of PLC, so that the materials are suspended and fully mixed.

[0067] Concentration and Level Detection Operation: The slurry concentration detector 43 and slurry level detector 44 can detect the slurry concentration and level under PLC control to ensure that the finished product meets the requirements for coal mine grouting fire prevention and extinguishing. The slurry that meets the requirements for coal mine grouting fire prevention and extinguishing can be discharged through the slurry outlet 2 to the conveying device to transport the fire prevention and extinguishing slurry to the coal mine grouting fire prevention and extinguishing area for fire prevention and extinguishing grouting.

[0068] In summary, this utility model, when applied to coal mine fire prevention and extinguishing scenarios, can solve the technical problems of low mixing efficiency and poor uniformity of fire extinguishing slurry, thereby improving the efficiency and reliability of coal mine fire prevention and extinguishing work and ensuring the safety and stability of coal mine production.

[0069] It should be noted that, in order to clearly show the structural relationship of the key internal components of this utility model, some pipes, lines, fixing brackets and other components of the actual product are omitted in the drawings. However, the specific design schemes of these omitted components are all easily implemented by those skilled in the art based on the technical solutions currently provided by this utility model and conventional design.

[0070] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A coal mine grouting fire prevention and extinguishing slurry preparation device, comprising a feed hopper (1) and a slurry outlet (2), characterized in that: Below the feed hopper (1) is a primary stirring chamber (3), and inside the primary stirring chamber (3) is a primary stirring shaft (31), and the primary stirring shaft (31) is provided with multiple primary stirring blades (311). Below the primary stirring chamber (3) is a secondary stirring chamber (4), and the slurry outlet (2) is located below the secondary stirring chamber (4). Inside the secondary stirring chamber (4) is a secondary stirring shaft (41), and multiple secondary stirring blades (411) are provided on the secondary stirring shaft (41). Above the secondary stirring shaft (41) is a pulse rotor shaft (42), and inside the pulse rotor shaft (42) is a pulse gas channel. Outside the pulse rotor shaft (42) are multiple pulse gas outlets (421) that communicate with the pulse gas channel.

2. The coal mine grouting fire prevention and extinguishing slurry preparation equipment according to claim 1, characterized in that: The feed hopper (1) is equipped with a vibrating screen (11).

3. The coal mine grouting fire prevention and extinguishing slurry preparation equipment according to claim 2, characterized in that: The vibrating screen (11) is equipped with multiple shock balls (12).

4. The coal mine grouting fire prevention and extinguishing slurry preparation equipment according to claim 3, characterized in that: A rotating dispersing shaft (32) is provided above the primary stirring shaft (31), and a plurality of material dispersing blades (321) are provided on the rotating dispersing shaft (32).

5. The coal mine grouting fire prevention and extinguishing slurry preparation equipment according to claim 4, characterized in that: The primary mixing chamber (3) is connected to an impact air cannon (5), and the air outlet (51) of the impact air cannon (5) extends into the interior of the primary mixing chamber (3).

6. The coal mine grouting fire prevention and extinguishing slurry preparation equipment according to claim 5, characterized in that: The impact air cannon (5) includes an air storage chamber (52), which is connected to the air outlet (51) via a first valve (53). The air storage chamber (52) is connected to the air inlet (55) of the impact air cannon (5) via a second valve (54). The air inlet (55) is used for compressed air input.

7. The coal mine grouting fire prevention and extinguishing slurry preparation equipment according to claim 1, characterized in that: The pulse gas outlet (421) is connected to a one-way valve or a solenoid valve to prevent the slurry in the secondary stirring chamber (4) from flowing back into the pulse gas channel.

8. The coal mine grouting fire prevention and extinguishing slurry preparation equipment according to claim 1, characterized in that: The primary mixing chamber (3) is also connected to a waste discharge port (6).

9. The coal mine grouting fire prevention and extinguishing slurry preparation equipment according to any one of claims 1 to 8, characterized in that: The secondary mixing chamber (4) is also equipped with a slurry concentration detector (43).

10. The coal mine grouting fire prevention and extinguishing slurry preparation equipment according to claim 9, characterized in that: The secondary mixing chamber (4) is also equipped with a slurry level detector (44).

Images