Quantitative double-shaft tooth type coal feeder and coal feeding method

Abstract

The invention relates to the technical field of coal briquette crushers, and discloses a quantitative double-shaft tooth-shaped coal feeder which comprises a shell, two driving parts arranged outside the shell and arranged in the same horizontal plane at an interval, and a tooth-shaped impeller located in the shell and in transmission connection with the two driving parts. Blades of the two tooth-shaped impellers are meshed with each other, and the rotation directions of the two tooth-shaped impellers are opposite. By arranging the two tooth-shaped impellers which are horizontally arranged and meshed with each other, material pushing and quantitative feeding can be achieved, the stirring and scattering effect is better through meshing of the two tooth-shaped impellers, and the situation of material caking is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of coal block crushers, and in particular to a quantitative double-shaft toothed coal feeder and a coal feeding method. Background Art

[0002] As modern mines gradually develop towards intelligence, traditional coal bunker feeding devices can no longer meet the needs of modern production. Most of the existing coal bunker feeding devices in old mines cannot achieve quantitative feeding, resulting in low coal transportation efficiency, while also increasing production uncertainty and energy consumption. In particular, the location for installing the feeding device in the original coal bunker is usually narrow, making it difficult to directly install the existing large-scale belt feeding device, further limiting the update of equipment and the upgrade of technology.

[0003] For example, the Chinese invention patent with document number CN108786984A, titled "A coal block crusher with quantitative control", has a complex structure, a vertically arranged breaking structure, and occupies a large overall space. In addition, there is only a single vertical auger as a breaking component, which has low efficiency, and small material lumps are still likely to exist after breaking. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a quantitative double-shaft toothed coal feeder and a coal feeding method. By setting two horizontally arranged and mutually meshing toothed impellers, not only can the material be pushed, but the meshing of the two toothed impellers can also achieve a better stirring and spreading effect without causing material agglomeration.

[0005] To achieve the above object, the present invention adopts the following technical scheme: a quantitative double-shaft toothed coal feeder, comprising a housing, two drive components arranged outside the housing and spaced apart in the same horizontal plane, and a toothed impeller located inside the housing and respectively connected to the two drive components by transmission; The blades of the two toothed impellers mesh with each other, and the two toothed impellers rotate in opposite directions.

[0006] Furthermore, one end of the blade of the toothed impeller is inclined forward, the other end is inclined backward, and the surface is smoothly arranged.

[0007] Furthermore, the shell includes a feed port shell and a discharge port shell that are buckled together; the feed port shell covers the top of the discharge port shell, and both are opened up and down; the front and rear sides of the discharge port shell are inclined.

[0008] Furthermore, one driving component is a first permanent magnet motor arranged outside the shell, and the other driving component is a second permanent magnet motor arranged at a distance from the first permanent magnet motor; one toothed impeller is a first toothed impeller connected to the first permanent magnet motor through a coupling, and the other toothed impeller is a second toothed impeller connected to the second permanent magnet motor through a coupling; a bearing connected to the toothed impeller is provided at one end of the shell away from the driving component corresponding to the coupling, and the bearing is fixed to the shell.

[0009] Furthermore, two support plates are fixedly mounted on the outside of the shell, a first permanent magnet motor is fixedly mounted on one support plate, and a second permanent magnet motor is fixedly mounted on the other support plate.

[0010] Furthermore, an end cover for protecting the bearing is arranged on the outer side of one end of the housing away from the driving component.

[0011] Furthermore, weighing sensors are arranged at the four corners of the bottom of the shell.

[0012] A method for feeding coal with a quantitative double-shaft gear-type coal feeder is characterized by comprising the following steps: Step 1, establishing a geometric model during feeding: extracting the cavity of the feed port casing and the discharge port casing where the material contacts, and the blades of the toothed impeller, and converting them into a geometric model; Step 2, establish a material flow model: use discrete unit analysis method to set material particles at the feed inlet; the particle size, physical parameters and distribution law of the particles are set according to the actual material characteristics; at the same time, set the contact model between particles, between particles and container walls, and between particles and blades; Step 3, set the material simulation flow conditions: set the simulation calculation time step; Step 4, set feeding process parameters: set feeding amount per unit time; Step 5, determine the rated feed rate motor speed: weigh the average feed rate at each test position and the material dispersion, and select the motor speed design scheme when setting the feed rate.

[0013] Furthermore, the specific method for determining the motor speed in step 5 is: from the given volume v between the two sets of toothed impellers and the density ρ of the coal, the mass m=ρv of the coal between the two sets of toothed impellers is obtained, and the rated feed rate Q is selected, then the motor speed n=Q / ρv.

[0014] The beneficial effects of the present invention are: 1. By setting two horizontally arranged and mutually meshing toothed impellers, not only can the material be pushed, but also the meshing of the two toothed impellers can achieve a better stirring and scattering effect, and the material will not clump, thereby improving the conveying efficiency. In addition, due to the existence of the breaking components, the material quantities at the feed port and the discharge port cannot be calculated equally. In this scheme, the two toothed impellers are meshed, and the continuous rotation of the gears and the friction between the materials cause the materials to be continuously loosened during the transmission process, ensuring the uniform distribution and stability of the materials, which is more conducive to quantitative output. In conjunction with the weighing sensor, it can more accurately input and output quantitatively. The design of the toothed impeller adopts the concept of "helical gears". During the rotation of the gears, it is more conducive to pushing the surrounding coal materials forward, and ensures that it can effectively mesh and transmit power to break up and push the materials during the rotation process.

[0015] 2. The present invention realizes efficient, stable and quantitative transportation and processing of coal materials by placing the entire device under the synergistic effect of a permanent magnet motor, a coupling, a toothed impeller and a weighing sensor while minimizing the size of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a side view structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the top view structure of the present invention; Figure 4 It is a schematic diagram of the toothed impeller structure of the present invention; Figure 5 It is a schematic diagram of the speed regulation method of the coal feeder of the present invention.

[0017] In the figure: 1. first permanent magnet motor; 101. second permanent magnet motor; 2. coupling; 3. bearing; 4. first toothed impeller; 401. second toothed impeller; 5. weighing sensor; 6. discharge port casing; 7. feed port casing; 8. end cover. DETAILED DESCRIPTION

[0018] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments.

[0019] Example: like Figure 1-Figure 5 As shown, a quantitative double-shaft toothed coal feeder comprises a housing, two driving components arranged outside the housing and spaced apart in the same horizontal plane, and a toothed impeller located inside the housing and respectively connected to the two driving components by transmission; The blades of the two toothed impellers are meshed with each other, and the rotation directions of the two toothed impellers are opposite; the two driving components and the toothed impellers connected thereto have the same structure and size; the direction from the driving component to the bearing 3 is the left-right direction, and in the same plane, the direction perpendicular to the left-right direction is the front-back direction; the two toothed impellers are arranged front-to-back in the same plane.

[0020] The two meshing toothed impellers are the core components of the device. Through their rotation and meshing, the material is transmitted and loosened. The design of the gears takes into account wear resistance and strength, ensuring efficient and stable performance in long-term operation. The meshing of the gears not only pushes the material forward, but also stirs and loosens the material to prevent the material from agglomerating, ensuring uniform distribution of the material and transmission stability.

[0021] like Figure 3 and Figure 4 As shown, one end of the blade of the toothed impeller is inclined forward, the other end is inclined backward, and the surface is smoothly arranged.

[0022] The shell includes a feed port casing 7 and a discharge port casing 6 which are buckled together; the feed port casing 7 covers the discharge port casing 6, and both are opened at the top and bottom; the front and rear sides of the discharge port casing 6 are inclined, and the top opening of the discharge port casing 6 is smaller than the bottom opening, so that the incoming material falls completely between the two toothed impellers and is completely broken up by the meshing of the toothed impellers, thereby improving the uniformity of the breaking up and further preventing the appearance of small lumps of material.

[0023] One driving component is a first permanent magnet motor 1 arranged outside the shell, and the other driving component is a second permanent magnet motor 101 arranged at a distance from the first permanent magnet motor 1; one toothed impeller is a first toothed impeller 4 connected to the first permanent magnet motor 1 through a coupling 2, and the other toothed impeller is a second toothed impeller 401 connected to the second permanent magnet motor 101 through a coupling 2; a bearing 3 connected to the toothed impeller is provided at one end of the shell away from the driving component corresponding to the coupling 2, and the bearing 3 is fixed to the shell; the combination of the coupling 2 and the bearing 3 not only improves the transmission efficiency, but also reduces mechanical wear and extends the service life of the equipment.

[0024] Two support plates are fixedly installed outside the shell, a first permanent magnet motor 1 is fixedly installed on one support plate, and a second permanent magnet motor 101 is fixedly installed on the other support plate; the toothed impeller includes blades, a roller and a transmission shaft, the transmission shaft passes through the shell and is connected to the coupling 2, a roller is fixedly sleeved on the outside of one end of the transmission shaft located inside the shell, blades are arranged outside the roller, the straight line where the root of the blade is located is parallel to the axis of the transmission shaft, and the left and right ends above the root are inclined in opposite directions respectively; the outer ring of the bearing 3 is fixed, and the inner ring rotates integrally with the transmission shaft.

[0025] An end cover 8 for protecting the bearing 3 is arranged on the outer side of the end of the shell away from the driving component. The end cover 8 corresponds to the coupling 2, and the bearing 3 is located inside the end cover 8. The whole equipment is reinforced by the feed port casing 7, the discharge port casing 6 and the rightmost end cover 8 respectively. The shell not only plays a supporting role, but also protects the internal mechanical components from the influence of the external environment.

[0026] Weighing sensors 5 are arranged at the four corners of the bottom of the shell; these weighing sensors 5 are used to accurately monitor and control the conveying amount of the material to ensure that the goal of quantitative feeding is achieved.

[0027] The weighing sensor 5 monitors the weight of the coal material in real time, and the method can feed back the data to the control system. The operator can adjust the parameters of the motor according to these feedback data to achieve quantitative feeding. The variable frequency speed regulation technology of the permanent magnet motor can accurately adjust the conveying speed to ensure that the amount of coal conveyed each time meets the preset requirements, thereby optimizing the production process, reducing resource waste, and improving production efficiency. The accurate feedback of the weighing sensor 5 not only helps to achieve high-precision material conveying control, but also can promptly detect and correct abnormal conditions in the conveying process, further improving the stability and reliability of the system.

[0028] The entire device has a compact structure, suitable for narrow installation space, and is particularly suitable for the renovation needs of old mines. The precise connection and coordination between the various components ensure the stability and reliability of the device during operation. Through optimized design, the device is not only easy to maintain, but also can operate efficiently in various harsh working environments.

[0029] A method for feeding coal with a quantitative double-shaft gear-type coal feeder, characterized in that it comprises the following steps: Step 1, establish the feeding geometry model: use LIGGGHTS software to establish the material simulation flow model of coal feeding; LIGGGHTS is a simulation software based on discrete element method (DEM), which is very suitable for simulating the flow behavior of granular materials; The cavity of the feed inlet casing 7 and the discharge outlet casing 6 where the material contacts, and the blades of the toothed impeller are extracted and converted into a geometric model; the volume v between the toothed impellers in the material model and the density ρ of the coal are determined; Use the region command of LIGGGHTS to define the shape and size of the container; if you need to simulate the continuous addition of coal particles, you need to define an incident region, and if there is an outlet, you also need to define it; Step 2, establish a material flow model: collect data on the physical properties of coal, such as particle size distribution, density, friction coefficient, etc.; use discrete unit analysis to set material particles in the feed inlet housing 7; the particle size, physical parameters and distribution law of the particles are set according to the actual material characteristics; at the same time, set the contact model between particles, between particles and container walls, and between particles and blades; Specifically: use the particle command to define the physical properties of particles, such as density, elastic modulus, friction coefficient, etc.; use the pair_style command and pair_coeff command to define the contact model between particles and the contact model between particles and container walls; use the fix gravity command to add gravity; use the fix wall or fix move command to define the behavior of the container wall; use the create_particles command to create initial particles; and use the velocity command to give particles an initial velocity. Step 3, set the material simulation flow conditions: set the simulation calculation step, use the timestep command to set the time step; use the run command to run the simulation, and you can choose a certain number of steps to simulate; use the write_restart or dump command to save the simulation data regularly; Step 4, set feeding process parameters: set feeding amount per unit time; Step 5, determine the rated feed rate motor speed: after the setting is completed, multiple simulation experiments are required to weigh the average feed rate and material dispersion of each experimental position to select the motor speed design scheme when setting the feed rate; From the given volume v between the two sets of toothed impellers and the density ρ of the coal, we can get the mass m=ρv of the coal between the two sets of toothed impellers. Selecting the rated feed rate Q, the motor speed n=Q / ρv.

[0030] The above description is only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A quantitative double-shaft gear-type coal feeder, Features: It comprises a housing, two driving components arranged outside the housing and spaced apart in the same horizontal plane, and a toothed impeller located inside the housing and respectively connected to the two driving components by transmission; The blades of the two toothed impellers mesh with each other, and the two toothed impellers rotate in opposite directions.

2. A quantitative double-shaft gear-type coal feeder according to claim 1, Features: One end of the blade of the toothed impeller is inclined forward, the other end is inclined backward, and the surface is smoothly arranged.

3. A quantitative double-shaft gear-type coal feeder according to claim 1, Features: The housing comprises a feed port housing (7) and a discharge port housing (6) which are buckled together; the feed port housing (7) covers the discharge port housing (6), and both are open at the top and bottom; the front and rear sides of the discharge port housing (6) are arranged obliquely.

4. A quantitative double-shaft gear-type coal feeder according to claim 1, Features: One of the driving components is a first permanent magnet motor (1) arranged outside the housing, and the other driving component is a second permanent magnet motor (101) arranged at a distance from the first permanent magnet motor (1); one of the toothed impellers is a first toothed impeller (4) drivingly connected to the first permanent magnet motor (1) via a coupling (2), and the other toothed impeller is a second toothed impeller (401) drivingly connected to the second permanent magnet motor (101) via a coupling (2); and a bearing (3) connected to the toothed impeller is provided at one end of the housing away from the driving component and corresponding to the coupling (2), and the bearing (3) is fixed to the housing.

5. A quantitative double-shaft gear-type coal feeder according to claim 4, Features: Two support plates are fixedly mounted on the outside of the housing, a first permanent magnet motor (1) is fixedly mounted on one of the support plates, and a second permanent magnet motor (101) is fixedly mounted on the other of the support plates.

6. A quantitative double-shaft gear-type coal feeder according to claim 3, Features: An end cover (8) for protecting the bearing (3) is arranged on the outer side of one end of the housing away from the driving component.

7. A quantitative double-shaft gear-type coal feeder according to claim 1, Features: Weighing sensors (5) are arranged at the four corners of the bottom of the shell.

8. A method for feeding coal using the quantitative double-shaft toothed coal feeder according to claims 1 to 7, It is characterized in that The following steps are involved: Step 1, establishing a geometric model during feeding: extracting the cavity of the feed port casing (7) and the discharge port casing (6) where the material contacts, and the blades of the toothed impeller, converting them into a geometric model, and obtaining a volume v between the two sets of toothed impellers; Step 2, establish a material flow model: use discrete unit analysis method to set material particles at the feed inlet casing 7; the particle size, physical parameters and distribution law of the particles are set according to the actual material characteristics; at the same time, set the contact model between particles, between particles and container walls, and between particles and blades; Step 3, set the material simulation flow conditions: set the simulation calculation time step; Step 4, set feeding process parameters: set feeding amount per unit time; Step 5, determine the motor speed at the rated feed rate: through the above steps, weigh and select the motor speed design scheme when setting the feed rate, that is, from the given volume v between the two sets of toothed impellers and the density ρ of the coal, the mass m=ρv of the coal between the two sets of toothed impellers is obtained, and the rated feed rate Q is selected, then the motor speed n=Q / ρv.

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