Coal conveying and unloading equipment with dustproof screen for coal preparation plant

Abstract

The application discloses a coal conveying and unloading equipment with dustproof screening for coal preparation plant, which comprises a main body with a concave shape with an opening facing upwards, an installation groove is formed in the inner side wall of the main body, a back-shaped block is slidably connected to the inner side wall of the main body through the installation groove, a plurality of springs are fixedly connected between the back-shaped block and the inner bottom wall of the installation groove, and a screening mechanism is arranged in the main body. The screening mechanism comprises an air outlet groove, a transfer cavity, an installation hole and an air inlet groove, a first communication cavity and a driving cavity which are arranged in the inner side wall of one side of the main body and the inner side wall of the other side of the main body respectively. The application has the advantages that the feeding is more uniform and smooth when the coal blocks are screened, the blockage is avoided, the dust flying when the coal blocks are poured is prevented, the pollution to the environment and the influence on the health of the workers are avoided, the use state of the filter bag can be monitored automatically while the dust is removed, the filter bag can be replaced in time, and the filtering effect is ensured.

Description

Technical Field

[0001] This invention relates to the field of coal transportation technology, and in particular to a dust-proof coal conveying and unloading device for coal preparation plants. Background Technology

[0002] A coal preparation plant is a coal processing plant that sorts coal, removing mineral impurities from raw coal and separating it into products of different specifications. Its main products are clean coal and lump coal, with byproducts including middlings and coal slime. After coal is transported to the coal preparation plant by trucks, it is unloaded into unloading equipment. This equipment screens the coal, separating large pieces from the slag. The large pieces are then lifted by elevators to the next stage of processing. Coal preparation plants are classified according to their product use: coking coal preparation plants produce low-ash clean coal for coking; and thermal coal preparation plants produce fuel coal for thermal power generation, steam locomotives, boilers, and raw materials for chemical industries.

[0003] In existing technologies, after the coal is dumped by the transport vehicle, the coal tends to accumulate at the equipment opening, causing blockages and affecting the operation of subsequent coal unloading. At the same time, when the transport vehicle dumps coal, the collision between coal and between coal and the equipment wall causes a large amount of coal dust to be raised. The raised coal dust not only pollutes the environment but also has a great impact on the health of the workers. Summary of the Invention

[0004] The purpose of this invention is to solve the problems in the prior art by proposing a dust-proof coal conveying and unloading equipment for coal preparation plants.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a coal preparation plant screening and dust-proof coal conveying and unloading equipment, comprising a main body with an upward-facing U-shaped cross section, an installation groove provided on the inner side wall of the main body, a spiral block slidably connected to the inner side wall of the main body through the installation groove, a plurality of springs fixedly connected between the spiral block and the bottom wall of the installation groove, and a screening mechanism provided inside the main body;

[0006] The screening mechanism includes an air outlet groove, a transfer chamber, and a mounting hole on one side wall of the main body, and an air inlet groove, a first connecting chamber, and a drive chamber on the other side wall of the main body. The mounting hole connects the transfer chamber to the air outlet groove, and the first connecting chamber connects the air inlet groove to the drive chamber. The main body is rotatably connected to a drive shaft through a bearing. A section of the drive shaft located in the drive chamber is interference-fitted with a vortex impeller. Both sections of the drive chamber located in the mounting groove are interference-fitted with cams. The cams abut against the upper surface of the U-shaped block. Multiple guide plates and a screen are fixedly connected to the inner side wall of the U-shaped block. The guide plates have several guide holes. A storage groove is provided on the side wall of the main body. A filter bag is fixedly connected to the inner side wall of the storage groove. A second connecting chamber is provided inside the main body, and the second connecting chamber connects the drive chamber to the storage groove.

[0007] In the aforementioned dust-proof coal conveying and unloading equipment for coal preparation plants, the main body sidewall is provided with a discharge hole, and a coal storage hopper is slidably connected through the main body sidewall.

[0008] In the aforementioned dust-proof coal conveying and unloading equipment for coal preparation plants, a separating mechanism is provided within the main body. The separating mechanism includes a functional cavity within the main body. A section of the drive shaft located within the functional cavity is fixedly connected to a conductive rod via an insulating rod. Several magnetic tiles are fixedly connected to the inner wall of the functional cavity. Conductive arcs a and b are fixedly connected to the two opposite inner end walls of the functional cavity. A swing groove is provided on the inner side wall of the main body. A lever plate is rotatably connected to the bottom wall of the swing groove via a pin. A torsion spring is provided between the lever plate and the bottom wall of the swing groove. A metal block is fixedly connected to the side wall of the lever plate located within the swing groove. Two electromagnets are provided within the main body. The electromagnets are electrically connected to the corresponding conductive arcs a and b via wires.

[0009] In the aforementioned dust-proof coal conveying and unloading equipment for coal preparation plants, the separating mechanism also includes two electrical contacts. The two electrical contacts are respectively fixedly connected to the two opposite inner side walls of the swing trough. An indicator light is fixedly connected to the main side wall. The indicator light, the electrical contacts, and the metal block are electrically connected through wires.

[0010] In the aforementioned dust-proof coal conveying and unloading equipment for coal preparation plants, a pressure relief valve is installed inside the mounting hole.

[0011] In the aforementioned dust-proof coal conveying and unloading equipment for coal preparation plants, the bearings between the drive shaft and the main body are all sealed bearings.

[0012] Compared with existing technologies, the advantages of this invention are:

[0013] 1. Driven by compressed air, the compressed air impacts the vortex impeller, causing the vortex impeller to rotate. The vortex impeller then drives the cam to rotate through the drive shaft. Through the cooperation of the cam and the spring, the reciprocating block moves up and down, which causes the guide plate and the screen to shake up and down continuously, dispersing the accumulated coal. At the same time, the guide plate lengthens the coal falling stroke, preventing it from accumulating at the inlet and ensuring the smooth progress of coal screening.

[0014] 2. During the process of compressed air entering the inlet from the outlet sluice, an air curtain is formed at the main inlet. After the coal enters the main body, the coal dust generated by the collision between coal and between coal and the equipment wall will not overflow the main body when it rises to the air curtain. Instead, it will be sent out of the inlet sluice along with the compressed air, and after passing through the drive chamber with the airflow, it will enter the storage tank. After being filtered by the filter bag, the coal dust will be discharged, thus avoiding a large amount of dust being raised when dumping coal, which would affect the environment and the health of the workers.

[0015] 3. While the drive shaft is rotating, it drives the conductive rod to rotate through the insulating rod, thereby causing the conductive rod to cut the magnetic field lines of the magnetic tile and generate an induced current. Through the setting of conductive arc a and conductive arc b, the two electromagnets are alternately energized. Through the alternating energization of the electromagnets, the plate swings back and forth continuously during the pouring of coal, distributing the poured coal evenly so that it falls evenly onto the guide plate and rolls downwards.

[0016] 4. While the conductive rod cuts the magnetic field lines of the magnetic tile to supply power to the electromagnet, it simultaneously monitors the condition of the filter bag. Since the airflow speed in the drive chamber is related to the condition of the filter bag, the greater the degree of blockage, the lower the airflow speed, and vice versa. Correspondingly, the degree of blockage determines the rotation speed of the conductive rod, which in turn determines the strength of the electromagnet's magnetic force. The condition of the filter bag can be monitored by the strength of the magnetic force. When the filter bag is severely blocked, the metal block cannot contact the grounding block, and the indicator light does not flash. This indicates that the filter bag needs to be replaced and cleaned to ensure timely cleaning and maintain effective dust collection. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a dust-proof coal conveying and unloading equipment for a coal preparation plant, as proposed in this invention.

[0018] Figure 2 for Figure 1 Enlarged view of point A in the image;

[0019] Figure 3 for Figure 1 Enlarged view of point B in the image;

[0020] Figure 4 for Figure 1A partial cross-sectional view at point CC;

[0021] Figure 5 for Figure 1 Partial cross-sectional view at DD in the middle;

[0022] Figure 6 for Figure 1 Cross-sectional view at EE in the middle;

[0023] Figure 7 for Figure 1 A partial cross-sectional view of FF in the image.

[0024] In the diagram: 1 Main body, 2 Mounting groove, 3 U-shaped block, 4 Spring, 5 Guide plate, 501 Flow guide hole, 6 Screen, 7 Air outlet groove, 8 Transfer chamber, 9 Mounting hole, 901 Pressure relief valve, 10 Air inlet groove, 11 First connecting chamber, 12 Drive chamber, 13 Drive shaft, 14 Vortex impeller, 15 Cam, 16 Second connecting chamber, 17 Storage tank, 18 Filter bag, 19 Discharge hole, 20 Coal storage hopper, 21 Functional chamber, 22 Insulating rod, 23 Conductive rod, 24 Magnet, 251 Conductive arc a, 252 Conductive arc b, 26 Electromagnet, 27 Swing groove, 29 Toggle plate, 30 Metal block, 31 Electrical connection block, 32 Indicator light, 33 Hoist. Detailed Implementation

[0025] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0026] Example

[0027] Reference Figure 1-7 A dust-proof coal conveying and unloading equipment for coal preparation plants includes a main body 1 with an upward-facing U-shaped cross section. An installation groove 2 is provided on the inner side wall of the main body 1. A spiral block 3 is slidably connected to the inner side wall of the main body 1 through the installation groove 2. Several springs 4 are fixedly connected between the spiral block 3 and the bottom wall of the installation groove 2. A screening mechanism is provided inside the main body 1.

[0028] The screening mechanism includes an air outlet groove 7, a transfer chamber 8, and a mounting hole 9 formed in one side wall of the main body 1, and an air inlet groove 10, a first connecting chamber 11, and a driving chamber 12 formed in the other side wall of the main body 1, as shown below. Figure 1As shown, the output end of the air compressor extends through into the intermediate transfer chamber 8, thereby pumping compressed air into the intermediate transfer chamber 8. The air compressor is existing technology and is not shown in the figure. The mounting hole 9 connects the intermediate transfer chamber 8 to the air outlet groove 7. The first connecting chamber 11 connects the air inlet groove 10 to the drive chamber 12. The main body 1 is rotatably connected to the drive shaft 13 through the bearing. The section of the drive shaft 13 located in the drive chamber 12 is interference-fitted with a vortex impeller 14. Both sections of the drive chamber 12 located in the mounting groove 2 are interference-fitted with cams 15. The cams 15 abut against the upper surface of the loop block 3. Multiple guide plates 5 and a screen 6 are fixedly connected to the inner side wall of the loop block 3. The guide plates 5 have several guide holes 501, such as... Figure 2 As shown, the diameter of the guide hole 501 gradually increases from top to bottom. This allows air to easily enter the guide hole 501 when the guide plate 5 moves up and down, while air is difficult to enter when it moves up and down due to the smaller diameter of the upper hole. This creates an upward airflow within the entire body 1 as the guide plate 5 reciprocates, thus sending coal dust from the middle and bottom walls upwards to the air curtain for treatment, preventing it from overflowing through the discharge hole 19 and causing pollution. A storage tank 17 is provided on the side wall of the body 1, and a filter bag 18 is fixedly connected to the inner side wall of the storage tank 17. A second connecting cavity 16 is provided inside the body 1, connecting the drive cavity 12 and the storage tank 17. Driven by compressed air, the compressed air impacts the vortex impeller 14, causing the vortex impeller 14 to rotate. The vortex impeller 14 then... The drive shaft 13 drives the cam 15 to rotate. Through the cooperation of the cam 15 and the spring 4, the loop block 3 moves up and down, which causes the guide plate 5 and the screen 6 to shake up and down continuously, dispersing the accumulated coal. At the same time, the guide plate 5 lengthens the coal falling stroke, preventing it from accumulating at the inlet and ensuring smooth coal screening. When the compressed air enters the inlet 10 from the outlet 7, it forms an air curtain at the inlet of the main body 1. After the coal enters the main body 1, the coal dust generated by the collision between coal and between coal and the equipment wall will not overflow the main body 1 when it rises to the air curtain. Instead, it will be sent out of the inlet 10 with the compressed air and enter the storage tank 17 after passing through the drive chamber with the airflow. After being filtered by the filter bag 18, the coal dust is discharged, thus preventing a large amount of dust from being raised when dumping coal.

[0029] The main body 1 has a discharge hole 19 on its side wall, and a coal storage hopper 20 is slidably connected through the side wall of the main body 1.

[0030] The main body 1 is equipped with a distributing mechanism, which includes a functional cavity 21 opened within the main body 1. A section of the drive shaft 13 located within the functional cavity 21 is fixedly connected to a conductive rod 23 via an insulating rod 22. Several magnetic tiles 24 are fixedly connected to the inner wall of the functional cavity 21. Figure 5As shown, the functional cavity 21 has a circular cross-section, and the magnetic tiles 24 are distributed on its arc surface. The magnetic field lines of the magnetic tiles 24 all point towards the axis of the drive shaft 13, thus ensuring that the conductive rod 23, when rotating with the drive shaft 13, continues to cut the magnetic field lines of the magnetic tiles 24. Conductive arcs a251 and b252 are fixedly connected to the two opposing inner end walls of the functional cavity 21. Figure 5 As shown, conductive arcs a251 and b252 are symmetrically arranged, and the two conductive arcs a251 and b252 are also symmetrical. When the conductive rod 23 contacts the two conductive arcs a251, one electromagnet 26 is energized. Similarly, when the conductive rod 23 contacts the two conductive arcs b252, the other electromagnet 26 is energized. A swing groove 27 is provided on the inner side wall of the main body 1. A lever 29 is rotatably connected to the bottom wall of the swing groove 27 via a pin. A torsion spring is provided between the lever 29 and the bottom wall of the swing groove 27. A metal block 30 is fixedly connected to the side wall of the lever 29 located in the swing groove 27. The metal block 30 is made of steel and can be subjected to the magnetic force of the electromagnet 26 and can also be used in the circuit. The main body 1 is equipped with two electromagnets 26. The electromagnets 26 are electrically connected to the corresponding conductive arcs a251 and b252 through wires. When the drive shaft 13 rotates, it drives the conductive rod 23 to rotate through the insulating rod 22, thereby causing the conductive rod 23 to cut the magnetic field lines of the magnetic tile 24 and generate an induced current. The conductive rod 23 alternately contacts the conductive arcs a251 and b252, thereby causing the two electromagnets 26 to be alternately energized. The alternating energization of the two electromagnets 26 causes the metal block 30 to be subjected to a magnetic force with alternating directions, thereby causing the metal block 30 to drive the dial plate 29 to move back and forth, distributing the poured coal evenly so that it falls evenly onto the guide plate and rolls downwards.

[0031] The dispensing mechanism also includes two electrical blocks 31, which are fixedly connected to the two opposing inner sidewalls of the swing groove 27. An indicator light 32 is fixedly connected to the sidewall of the main body 1. The indicator light 32, electrical blocks 31, and metal block 30 are electrically connected via wires. When the electrical block 31 contacts the metal block 30, the indicator light 32 illuminates. While the conductive rod 23 cuts the magnetic field lines of the magnetic tile 24 to supply power to the electromagnet 26, it simultaneously detects the condition of the filter bag 18. Since the airflow velocity in the drive cavity 12 is related to the condition of the filter bag 18, the greater the degree of filter bag blockage, the greater the resistance to airflow through the filter bag 18, resulting in a lower airflow velocity, and vice versa. Correspondingly, the degree of filter bag blockage... The airflow speed is determined by the rotation speed of the vortex impeller 14, which in turn determines the rotation speed of the conductive rod 23. The rotation speed of the conductive rod 23, in turn, determines the magnetic force of the electromagnet 26. The condition of the filter bag can be monitored by the magnitude of the magnetic force. When the filter bag 18 is severely clogged, the speed at which the conductive rod 23 cuts the magnetic field lines of the magnetic tile 24 slows down, which in turn reduces the magnetic force of the electromagnet 26. At this time, the attraction force of the electromagnet 26 to the metal block 30 is insufficient to overcome the elastic force of the torsion spring, and thus it cannot make contact with the grounding block 31. The indicator light 32 does not flash. This indicates that the filter bag needs to be replaced and cleaned. This makes the condition of the filter bag 18 clear at a glance, ensuring timely cleaning of the filter bag 18 and thus ensuring the dust collection effect.

[0032] A pressure relief valve 901 is installed in the mounting hole 9. The pressure relief valve 901 opens automatically when there is a certain pressure. The purpose of the pressure relief valve 901 is to allow air to enter the air outlet groove 7 synchronously from each mounting hole, thereby ensuring that the air sprayed out of the air outlet groove 7 is uniform and avoiding dust overflow in areas with weak airflow due to uneven air spray.

[0033] The bearings between the drive shaft 13 and the main body 1 are all sealed bearings. The sealed bearings ensure the seal at the bearing connection, thereby preventing air from leaking from the bearing connection and affecting the airtightness, and preventing the collected dust from overflowing again.

[0034] In this invention, when the transport vehicle dumps coal into the main body 1, the air compressor is turned on to pump compressed air into the transfer chamber 8. The compressed air enters the air outlet 7 through the mounting hole 9 and is sprayed out through the air outlet 7, forming an air curtain at the inlet of the main body 1. When the coal is dumped, the coal dust generated by the collision between coal and between coal and the equipment wall rises to the air curtain, it will not overflow the main body 1, but will be sent out of the air inlet 10 along with the compressed air. After passing through the drive chamber with the airflow, it enters the storage tank 17 and is filtered by the filter bag 18 before being discharged, thereby avoiding a large amount of dust being raised when dumping coal.

[0035] When compressed air enters the drive chamber 12, it impacts the blades of the vortex impeller 14, causing the vortex impeller 14 to rotate. This rotation drives the drive shaft 13 to rotate, which in turn drives the conductive rod 23 to rotate via the insulating rod 22. The rotating conductive rod 23 cuts the magnetic field lines of the magnetic tile 24, generating an induced current. The conductive rod 23 alternately contacts the conductive arcs a251 and b252, causing the two electromagnets 26 to be alternately energized. This alternating energization of the two electromagnets 26 causes the metal block 30 to be subjected to alternating magnetic forces. Consequently, the metal block 30 drives the paddle plate 29 to move back and forth, distributing the poured coal evenly so that it falls evenly onto the guide plate and rolls downwards.

[0036] During the rolling process, the rotation of the drive shaft 13 drives the cam 15 to rotate. Through the cooperation of the cam 15 and the spring 4, the loop block 3 moves up and down, which causes the guide plate 5 and the screen 6 to shake up and down continuously, dispersing the accumulated coal. At the same time, the guide plate 5 lengthens the coal falling stroke, preventing it from accumulating at the inlet and ensuring the smooth progress of coal screening.

[0037] At the same time, when the guide plate 5 moves up and down, it will create an airflow from bottom to top within the entire main body 1, thereby sending the coal dust in the middle and bottom wall upward to the air curtain for treatment, thus preventing it from overflowing through the discharge hole 19 and causing pollution.

[0038] During the rolling process, the coal slag falls into the coal storage hopper 20 below through the screen 6, while large pieces of coal fall onto the elevator 33 through the discharge hole 19 below and are transported to the next process.

[0039] While the conductive rod 23 cuts the magnetic field lines of the magnetic tile 24 to supply power to the electromagnet 26, it simultaneously monitors the condition of the filter bag 18. Since the airflow velocity within the drive chamber 12 is related to the condition of the filter bag 18, the greater the degree of blockage, the greater the resistance to airflow through the filter bag 18, resulting in a lower airflow velocity, and vice versa. Correspondingly, the degree of blockage in the filter bag determines the airflow velocity, which in turn determines the rotational speed of the vortex impeller 14, and thus the rotational speed of the conductive rod 23. The rotational speed of the conductive rod 23, in turn, determines... The strength of the electromagnet 26's magnetic force can be used to monitor the filter bag's condition. When the filter bag 18 is severely clogged, the speed at which the conductive rod 23 cuts the magnetic field lines of the magnetic tile 24 slows down, consequently reducing the magnetic force of the electromagnet 26. At this point, the attraction force of the electromagnet 26 to the metal block 30 is insufficient to overcome the spring force of the torsion spring, meaning it cannot contact the grounding block 31, and the indicator light 32 does not flash. This indicates that the filter bag needs to be replaced and cleaned, making the condition of the filter bag 18 readily apparent and ensuring timely cleaning of the filter bag 18, thereby guaranteeing the dust collection effect.

[0040] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A dust-proof coal conveying and unloading device for a coal preparation plant, comprising a main body (1) with an upward-facing U-shaped cross-section, characterized in that, The inner wall of the main body (1) is provided with an installation groove (2), and a spiral block (3) is slidably connected to the inner wall of the main body (1) through the installation groove (2). Several springs (4) are fixedly connected between the spiral block (3) and the bottom wall of the installation groove (2). A screening mechanism is provided inside the main body (1). The screening mechanism includes an air outlet groove (7), a transfer chamber (8), and a mounting hole (9) opened in one side wall of the main body (1), and an air inlet groove (10), a first connecting chamber (11), and a drive chamber (12) opened in the other side wall of the main body (1). The mounting hole (9) connects the transfer chamber (8) and the air outlet groove (7), and the first connecting chamber (11) connects the air inlet groove (10) and the drive chamber (12). The main body (1) is rotatably connected to a drive shaft (13) through a bearing. A section of the drive shaft (13) located in the drive chamber (12) is press-fitted with a vortex impeller (14). Both sections of the drive chamber (12) located in the mounting groove (2) are press-fitted with cams (15). 5) Abutting against the upper surface of the herringbone block (3), the inner sidewall of the herringbone block (3) is fixedly connected with multiple guide plates (5) and a screen (6). The guide plates (5) are provided with several guide holes (501). The diameter of the guide holes (501) gradually increases from top to bottom. When the guide plates (5) move up and down, they form an internal airflow from bottom to top, which guides the dust at the bottom and middle of the main body (1) upward to the air curtain to avoid dust overflow. The sidewall of the main body (1) is provided with a storage tank (17). The inner sidewall of the storage tank (17) is fixedly connected with a filter bag (18). The main body (1) is provided with a second connecting cavity (16). The second connecting cavity (16) connects the driving cavity (12) and the storage tank (17).

2. The dust-proof coal conveying and unloading equipment for coal preparation plants according to claim 1, characterized in that, The main body (1) has a discharge hole (19) on its side wall, and a coal storage hopper (20) is slidably connected through the side wall of the main body (1).

3. The dust-proof coal conveying and unloading equipment for coal preparation plants according to claim 1, characterized in that, The main body (1) is provided with a distributing mechanism, which includes a functional cavity (21) opened in the main body (1). A section of the drive shaft (13) located in the functional cavity (21) is fixedly connected to a conductive rod (23) by an insulating rod (22). Several magnetic tiles (24) are fixedly connected to the inner wall of the functional cavity (21). Conductive arc a (251) and conductive arc b (252) are fixedly connected to the two opposite inner end walls of the functional cavity (21). The inner side wall of the main body (1) is opened A swing groove (27) is provided. A lever (29) is rotatably connected to the bottom wall of the swing groove (27) via a pin. A torsion spring is provided between the lever (29) and the bottom wall of the swing groove (27). A metal block (30) is fixedly connected to the side wall of the lever (29) located on one side of the swing groove (27). Two electromagnets (26) are provided in the main body (1). The electromagnets (26) are electrically connected to the corresponding conductive arcs a (251) and b (252) via wires.

4. A dust-proof coal conveying and unloading equipment for coal preparation plants according to claim 3, characterized in that, The dispensing mechanism also includes two electrical blocks (31), which are fixedly connected to the two inner sidewalls opposite to each other on the swing groove (27). An indicator light (32) is fixedly connected to the sidewall of the main body (1). The indicator light (32), the electrical blocks (31), and the metal block (30) are electrically connected by wires.

5. A dust-proof coal conveying and unloading equipment for a coal preparation plant according to claim 1, characterized in that, A pressure relief valve (901) is provided inside the mounting hole (9).

6. A dust-proof coal conveying and unloading equipment for a coal preparation plant according to claim 1, characterized in that, The bearings between the drive shaft (13) and the main body (1) are all sealed bearings.

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