A mine filling gangue concrete blowing and mixing device

Abstract

The utility model discloses a kind of for mixed mine filling gangue concrete's injection and blowing uniform mixing device, including box body component, the right side lower end of the box body component is fixedly connected high-pressure airflow component, the upper end surface of the box body component is fixedly connected with mechanical stirring assembly, mixed uniformity and efficiency significantly improve the powerful radial and axial shear force of the helical stirring blade of mechanical stirring assembly, realize preliminary mixing and material conveying on macro, high-pressure airflow component is from side wall and bottom multiple point, multi-direction jet airflow, produce strong vortex and micro turbulent flow, realize fine mixing on micro, two mechanisms complement each other, so that material is fully turned over, sheared and convected in three-dimensional space, mixed uniformity reaches new height, and mixing time is greatly shortened, by control system, the introduction of gas heating unit, expand the application ability of device in low temperature environment or need temperature catalysis Special working condition.

Description

Technical Field

[0001] This utility model belongs to the field of concrete processing technology, specifically relating to a jet mixing device for mixing coal gangue concrete used for filling mine gangue. Background Technology

[0002] Mine backfilling technology is one of the core components of green mine construction and safe production. Among these technologies, using gangue concrete prepared from coal mine solid waste offers both environmental and economic advantages. In this process, thorough and efficient mixing of gangue, binder, and water is crucial for forming a homogeneous backfill and ensuring backfill quality.

[0003] Currently, underground filling mainly uses mechanical mixing tanks or high-pressure airflow-based jet mixing devices. Mechanical mixing tanks use rotating mixing blades to shear and mix materials. Although widely used, they have significant drawbacks: First, for highly viscous gangue concrete, "mixing dead zones" easily form on the tank walls, bottom, and back of the blades, leading to uneven mixing and the risk of clumping. Second, the sealing structure between the mixing shaft and the bottom of the tank is complex, and long-term operation in highly abrasive gangue slurry can easily cause wear and leakage, resulting in high maintenance costs.

[0004] To overcome the shortcomings of purely mechanical stirring, pneumatic jet mixing technology has emerged. This technology achieves non-mechanical contact mixing by injecting high-pressure airflow into the mixing chamber and using the kinetic energy of the airflow to impact the materials. However, existing pneumatic jet mixing devices also face many challenges: 1. Limited mixing effect: The distribution of a single, fixed-direction continuous airflow field is uneven, making it difficult to effectively turn over the material in the entire compartment, especially the thick part deposited at the bottom, and easily creating mixing blind spots.

[0005] 2. Energy consumption and efficiency issues: To achieve a certain mixing intensity, a continuous supply of high-pressure, high-flow-rate airflow is usually required, resulting in huge energy consumption. At the same time, the continuous positive pressure inside the chamber and the lack of an effective pressure release path will create back pressure, which will weaken the jet kinetic energy of the subsequent airflow and lead to diminishing efficiency.

[0006] 3. Adaptability issues: In the low-temperature mining environment, the cold air introduced may cause moisture in the material to condense on the bin walls or nozzles, increasing the risk of material adhesion and nozzle blockage. In addition, the discharge process of existing equipment mostly relies on gravity flow. For flat-bottom bin designs or viscous materials, residues are easily left at the bottom of the bin, resulting in material waste and subsequent cleaning difficulties.

[0007] Therefore, there is an urgent need in this field for a mixing device for mine backfill gangue concrete that has high mixing efficiency, low energy consumption, can adapt to harsh working conditions, and can completely discharge materials. Utility Model Content

[0008] The purpose of this invention is to provide a spray mixing device for mine gangue filling concrete to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, this utility model provides the following technical solution: a jet mixing device for mine backfilling gangue concrete, comprising a box assembly, a high-pressure airflow assembly fixedly connected to the lower right end of the box assembly, and a mechanical stirring assembly fixedly connected to the upper end of the box assembly.

[0010] Preferably, the housing assembly includes a main mixing chamber, a feed valve, and a discharge valve. The feed valve is fixedly connected to the upper end face of the main mixing chamber, and the discharge valve is fixedly connected to the lower end of the left end face of the main mixing chamber.

[0011] Preferably, the housing assembly further includes an exhaust valve, which is located at the top of the main mixing chamber.

[0012] Preferably, the high-pressure airflow assembly includes a high-pressure air source controller, a high-pressure airflow duct, a side wall high-pressure airflow nozzle, and a bottom high-pressure airflow nozzle. One end of the high-pressure airflow duct passes through the main mixing chamber and is fixedly connected to the high-pressure air source controller. The high-pressure airflow duct is fixedly connected to multiple sets of side wall high-pressure airflow nozzles. The high-pressure airflow duct is fixedly connected to a bottom high-pressure airflow nozzle. The high-pressure airflow duct is embedded inside the side wall of the main mixing chamber.

[0013] Preferably, it further includes a discharge auxiliary nozzle, which is disposed at the bottom of the main mixing chamber and faces the inlet of the discharge valve, and is connected to the high-pressure airflow duct.

[0014] Preferably, the high-pressure air source controller includes a pulse control module, and the side wall high-pressure airflow nozzle and the bottom high-pressure airflow nozzle are configured to spray intermittently in pulse mode.

[0015] Preferably, the high-pressure gas source controller further includes a gas heating unit for preheating the incoming high-pressure gas flow.

[0016] Preferably, the gas heating unit is an electric heating wire wound around the outer wall of the high-pressure gas flow duct.

[0017] Preferably, the high-pressure gas source controller includes a temperature control module for setting and adjusting the heating temperature of the gas heating unit, and the temperature control module is electrically connected to the gas heating unit.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. Synergistic effect, seamless mixing: Through the synergistic effect of mechanical stirring (macroscopic shearing) and high-pressure pulsed airflow (microscopic turbulence), three-dimensional and all-round mixing from the bottom to the top of the bin is achieved, completely eliminating the "stirring dead zone" and "airflow blind zone", resulting in extremely high mixing uniformity.

[0019] 2. Significantly reduced energy consumption and consistently stable efficiency: Employing a pulse jet mode, it utilizes instantaneous peak kinetic energy to crush materials, resulting in greater energy savings compared to continuous jetting. Combined with an exhaust valve to promptly release internal pressure, it maintains the optimal pressure difference between the inside and outside of the chamber, ensuring that each pulse jet is highly efficient and powerful, avoiding the problem of efficiency degradation.

[0020] 3. Intelligent control, adaptable to complex working conditions: The integrated gas heating and temperature control module effectively prevents adhesion and blockage caused by low-temperature condensation, broadening the application range of the device. The design of the discharge auxiliary nozzle enables pneumatic-assisted discharge, solving the industry problem of material residue in flat-bottom silos and ensuring thorough discharge.

[0021] 4. Optimized structure and improved durability: The design of embedding the high-pressure airflow duct inside the chamber wall avoids interference with the internal structure and protects the pipeline. At the same time, the airflow mixing distributes part of the mechanical stirring load, reducing wear on the stirring components and extending the overall service life of the equipment. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall front structure of this utility model; Figure 2 This is a schematic diagram of the overall left side structure of this utility model; Figure 3 This is a top view of the internal structure of this utility model; Figure 4 For the present utility model Figure 3 Enlarged structural diagram at point A; Figure 5 This is a schematic diagram of the internal structure of the present invention;

[0023] In the diagram: 1. Box assembly; 101. Main mixing chamber; 102. Feed valve; 103. Discharge valve; 104. Exhaust valve; 2. High-pressure airflow assembly; 201. High-pressure air source controller; 202. High-pressure airflow duct; 203. Side wall high-pressure airflow nozzle; 204. Bottom high-pressure airflow nozzle; 205. Heating wire; 206. Discharge auxiliary nozzle; 3. Mechanical stirring assembly; 301. Drive motor; 302. Stirring shaft; 303. Spiral stirring blades. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0025] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," 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 simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1-5 One embodiment of this utility model is a spray mixing device for mine backfill gangue concrete, which includes a box assembly 1, a high-pressure airflow assembly 2 fixedly connected to the lower right end of the box assembly 1, and a mechanical mixing assembly 3 fixedly connected to the upper end of the box assembly 1.

[0029] Specifically, the box assembly 1 includes a main mixing chamber 101, a feed valve 102, and a discharge valve 103. The feed valve 102 is fixedly connected to the upper end face of the main mixing chamber 101, and the discharge valve 103 is fixedly connected to the lower end of the left end face of the main mixing chamber 101. The entire box assembly 1 constitutes a complete mixing container and realizes the smooth entry and exit of materials.

[0030] Specifically, the housing assembly 1 also includes an exhaust valve 104, which is located at the top of the main mixing chamber 101. The exhaust valve 104 dynamically maintains the internal pressure balance of the mixing chamber, ensuring that the high-pressure airflow can be sprayed efficiently, while ensuring the safe operation of the equipment.

[0031] Specifically, the high-pressure airflow assembly 2 includes a high-pressure air source controller 201, a high-pressure airflow duct 202, side wall high-pressure airflow nozzles 203, and a bottom high-pressure airflow nozzle 204. One end of the high-pressure airflow duct 202 passes through the main mixing chamber 101 and is fixedly connected to the high-pressure air source controller 201. The high-pressure airflow duct 202 is fixedly connected to multiple sets of side wall high-pressure airflow nozzles 203. The high-pressure airflow duct 202 is fixedly connected to the bottom high-pressure airflow nozzle 204. The high-pressure airflow duct 202 is embedded in the side wall of the main mixing chamber 101, generating airflow disturbance from the side and bottom simultaneously to achieve three-dimensional stirring and fluidization of the material.

[0032] Specifically, it also includes a discharge auxiliary nozzle 206, which is located at the bottom of the main mixing chamber 101 and faces the inlet of the discharge valve 103, and is connected to the high-pressure airflow duct 202 to solve the technical problem of material residue in the flat-bottomed chamber.

[0033] Specifically, the high-pressure air source controller 201 includes a pulse control module. The side wall high-pressure airflow nozzle 203 and the bottom high-pressure airflow nozzle 204 are configured to intermittently spray air in pulse mode, replacing continuous airflow with pulsed high-kinetic energy impact, which significantly improves the shearing and mixing intensity of the airflow on the material, while achieving energy saving and consumption reduction.

[0034] Specifically, the high-pressure gas source controller 201 also includes a gas heating unit, which is used to preheat the incoming high-pressure gas flow to prevent material adhesion and nozzle blockage caused by gas flow condensation under low-temperature conditions, thereby improving the environmental adaptability of the device.

[0035] Specifically, the gas heating unit is an electric heating wire 205 wound around the outer wall of the high-pressure gas flow duct 202, providing a direct heating method with a simple structure and high heat conduction efficiency, ensuring the preheating effect of the gas flow.

[0036] Specifically, the high-pressure gas source controller 201 includes a temperature control module for setting and adjusting the heating temperature of the gas heating unit. The temperature control module is electrically connected to the gas heating unit to achieve precise and intelligent control of the gas flow temperature, ensuring a stable and reliable heating process and meeting the needs of different working conditions.

[0037] The working principle of the mine backfilling gangue concrete spraying and mixing device of this utility model is as follows: First, feeding and initialization are performed. The discharge valve 103 is closed, and the feed valve 102 is opened. Components such as gangue, cementitious materials, and water are fed into the main mixing chamber 101 through the feed valve 102. After feeding is complete, the feed valve 102 is closed to create conditions for closed-loop mixing.

[0038] Subsequently, the core collaborative mixing stage begins. In this stage, the mechanical stirring component 3 and the high-pressure airflow component 2 start simultaneously and work together.

[0039] Mechanical stirring: The drive motor 301 starts, driving the stirring shaft 302 and its multiple sets of spiral stirring blades 303 to rotate, macroscopically shearing, lifting and tumbling the material, effectively breaking up the initial clumps.

[0040] Airflow agitation: The high-pressure gas source controller 201 is activated, delivering high-pressure gas to each nozzle through the high-pressure airflow conduit 202. During this process, the gas heating unit, such as the electric heating wire 205, can preheat the airflow under the precise control of the temperature control module to prevent low-temperature condensation. The pulse control module controls the side wall high-pressure airflow nozzle 203 and the bottom high-pressure airflow nozzle 204 to perform pulsed intermittent jetting at a specific frequency and duty cycle.

[0041] Pulsed airflow can instantly generate impact and shear forces far stronger than continuous airflow, creating intense microscopic turbulence in materials.

[0042] The side-wall nozzles impact the material horizontally, while the bottom nozzles impact and lift the deposited material from below. Combined with the motion of mechanical stirring, this creates a three-dimensional, dead-zone-free, powerfully mixing flow field.

[0043] Pressure balance: Throughout the mixing process, the exhaust valve 104 located on the top of the chamber continuously operates to expel excess gas from the chamber and maintain dynamic pressure balance. This ensures that the high-pressure airflow can always be smoothly injected with the designed kinetic energy, avoiding a decrease in mixing efficiency due to increased back pressure, and also serves as a safety protection function.

[0044] Finally, pneumatic-assisted discharge is performed. After the mixing process is completed, the discharge valve 103 is opened. At this time, the discharge auxiliary nozzle 206 is activated, spraying a strong airflow towards the inlet of the discharge valve 103. This airflow can perform a final purging and pushing of any material that may remain in the flat-bottom hopper, achieving pneumatic-assisted discharge and ensuring that the material is discharged.

Claims

1. A jet mixing device for mine backfilling gangue concrete, comprising a box assembly (1), characterized in that: The lower right side of the box assembly (1) is fixedly connected to the high-pressure airflow assembly (2), and the upper end of the box assembly (1) is fixedly connected to the mechanical stirring assembly (3).

2. The mine backfilling gangue concrete jet mixing device according to claim 1, characterized in that: The box assembly (1) includes a main mixing chamber (101), a feed valve (102) and a discharge valve (103). The feed valve (102) is fixedly connected to the upper end face of the main mixing chamber (101), and the discharge valve (103) is fixedly connected to the lower end of the left end face of the main mixing chamber (101).

3. The jet mixing device for mine backfill gangue concrete according to claim 2, characterized in that: The housing assembly (1) also includes an exhaust valve (104) located at the top of the main mixing chamber (101).

4. The jet mixing device for mine backfill gangue concrete according to claim 2, characterized in that: The high-pressure airflow assembly (2) includes a high-pressure air source controller (201), a high-pressure airflow duct (202), a side wall high-pressure airflow nozzle (203), and a bottom high-pressure airflow nozzle (204). One end of the high-pressure airflow duct (202) passes through the main mixing chamber (101) and is fixedly connected to the high-pressure air source controller (201). The high-pressure airflow duct (202) is fixedly connected to multiple sets of side wall high-pressure airflow nozzles (203). The high-pressure airflow duct (202) is fixedly connected to the bottom high-pressure airflow nozzle (204). The high-pressure airflow duct (202) is embedded inside the side wall of the main mixing chamber (101).

5. The jet mixing device for mine backfill gangue concrete according to claim 4, characterized in that: It also includes a discharge auxiliary nozzle (206), which is located at the bottom of the main mixing chamber (101) and faces the inlet of the discharge valve (103), and is connected to the high-pressure airflow duct (202).

6. The jet mixing device for mine backfilling gangue concrete according to claim 4, characterized in that: The high-pressure air source controller (201) includes a pulse control module, and the side wall high-pressure airflow nozzle (203) and the bottom high-pressure airflow nozzle (204) are configured to intermittently spray air in a pulse mode.

7. The jet mixing device for mine backfill gangue concrete according to claim 4, characterized in that: The high-pressure gas source controller (201) also includes a gas heating unit for preheating the incoming high-pressure gas flow.

8. The mine backfilling gangue concrete jet mixing device according to claim 7, characterized in that: The gas heating unit is an electric heating wire (205) wrapped around the outer wall of the high-pressure gas flow duct (202).

9. A jet mixing device for mine backfill gangue concrete according to claim 7 or 8, characterized in that: The high-pressure gas source controller (201) includes a temperature control module for setting and adjusting the heating temperature of the gas heating unit, and the temperature control module is electrically connected to the gas heating unit.

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