A coal chute bypass device and its working method

Abstract

The present invention belongs to the field of large belt conveyor equipment, and particularly relates to a coal dropping pipe bypass device and its working method. The device includes an upper coal dropping pipe, a drum-type electromagnetic separator is arranged at the inlet of the upper coal dropping pipe, an electromagnetic mechanism and a coal flow baffle are arranged at the top of the upper coal dropping pipe, the coal flow baffle is movably connected to the upper coal dropping pipe, and the lower end of the upper coal dropping pipe communicates with the main coal dropping pipe and the bypass coal dropping pipe; a first lower-level belt is arranged at the outlet of the main coal dropping pipe, and a second lower-level belt is arranged at the outlet of the bypass coal dropping pipe; the control system is connected to the electromagnetic mechanism, the first lower-level belt and the second lower-level belt, and the control system is used to control the start and stop of the electromagnetic mechanism, the first lower-level belt and the second lower-level belt. The device has few changes to the original equipment, low transformation cost, reasonable structure, convenient maintenance, high automation degree, can quickly switch the coal flow when a fault occurs, and the front-end coal source equipment does not need to stop running, with stable operation and strong reliability.

Description

Technical Field

[0001] The present invention belongs to the field of large belt conveyor equipment, and particularly relates to a coal dropping pipe bypass device and its working method. Background Art

[0002] There are many large equipment and high-power belt conveyors in the fuel system of thermal power plants. Most of the large belt conveyors are located at the front end of the coal conveying system. If the equipment at the rear end fails and stops, it will cause the large equipment at the front end to be interlocked and stop urgently. When starting again, it will be a heavy-load start. This will lead to an increase in the maintenance cost of large equipment, a decrease in equipment reliability, and an increase in production and operation costs.

[0003] Defects and deficiencies of the prior art:

[0004] (1) Due to the protection logic limitation of the coal conveying system, after the equipment fails and stops, all the equipment in front of the faulty equipment will be interlocked and stop urgently. When starting again, it will surely be a heavy-load start. The traditional method is to increase the start-stop time interval of the equipment to ensure that the temperature of the relevant components of the equipment does not exceed the standard. Although this method can effectively control the temperature rise of the front-end equipment motor, the instantaneous ultra-high starting current and starting torque will still cause harm to the relevant components of the equipment, thereby reducing equipment reliability and increasing maintenance costs.

[0005] (2) There is no coal dropping pipe bypass buffer mechanism set in the existing industry production practice. Summary of the Invention

[0006] The purpose of the present invention is to overcome the above deficiencies, and provide a coal dropping pipe bypass device and its working method. The device has less modification to the original equipment, low transformation cost, reasonable structure, convenient maintenance, high automation degree, stable operation, and strong reliability.

[0007] In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0008] A coal dropping pipe bypass device includes a control system, a drum-type electromagnetic separator, an electromagnet mechanism, a coal flow baffle, a main coal dropping pipe, a distributing baffle, a bypass coal dropping pipe, an upper coal dropping pipe, a first lower belt and a second lower belt;

[0009] A drum-type electromagnetic separator is arranged at the entrance of the upper coal dropping pipe. An electromagnet mechanism and a coal flow baffle are arranged at the top of the upper coal dropping pipe. The coal flow baffle is movably connected to the upper coal dropping pipe. The lower end of the upper coal dropping pipe is communicated with the main coal dropping pipe and the bypass coal dropping pipe. A distributing baffle is arranged at the communicating part of the main coal dropping pipe and the bypass coal dropping pipe. The outlet of the main coal dropping pipe is provided with a first lower belt, and the outlet of the bypass coal dropping pipe is provided with a second lower belt;

[0010] When the coal flow baffle is attracted by the electromagnet mechanism, the coal flow enters the main coal dropping pipe. When the coal flow baffle enters the gravitational range of the drum-type electromagnetic separator and contacts the distributing baffle, the coal flow enters the bypass coal dropping pipe;

[0011] The control system is connected to the electromagnet mechanism, the first lower belt, and the second lower belt, and is used to control the start and stop of the electromagnet mechanism, the first lower belt, and the second lower belt.

[0012] The coal flow baffle is movably connected to the upper coal dropping pipe through a rotating shaft, and a counterweight iron block is fixedly arranged on the coal flow baffle.

[0013] The drum type iron remover is located at the end of the upper belt.

[0014] A first belt feeding trough is arranged at the outlet of the main coal dropping pipe, a first lower belt is arranged at the bottom of the first belt feeding trough, and a first blanking point buffer bed is arranged below the first lower belt.

[0015] A pressure sensor is arranged on the first blanking point buffer bed, and the pressure sensor is connected to the control system.

[0016] A second belt feeding trough is arranged at the outlet of the bypass coal dropping pipe, a second lower belt is arranged at the bottom of the second belt feeding trough, and a second blanking point buffer bed is arranged below the second lower belt.

[0017] A pressure sensor is arranged on the second blanking point buffer bed, and the pressure sensor is connected to the control system.

[0018] A working method of a coal dropping pipe bypass device includes the following steps:

[0019] S1. When the coal dropping pipe is operating normally, the coal flow baffle and the electromagnet mechanism are in an attracting state, and the coal flow enters the main coal dropping pipe and falls on the first lower belt;

[0020] S2. When a fault occurs in the main coal dropping pipe, a signal is transmitted to the control system. The control system cuts off the power supply of the electromagnet mechanism and the first lower belt, and the first lower belt stops running. At the same time, the control system starts the second lower belt. The coal flow baffle rotates under the action of gravity into the magnetic field attracting range of the drum type iron remover and contacts and closes with the material distributing baffle, and the coal flow is guided into the bypass coal dropping pipe and falls on the second lower belt;

[0021] S3. After the fault is eliminated, the control system first starts the first lower belt. After the control system detects that the first lower belt is running stably, it then turns on the power supply of the electromagnet mechanism. The coal flow baffle and the electromagnet mechanism are attracted again, and the coal flow enters the main coal dropping pipe and falls on the first lower belt. The system stops the operation of the second lower belt after detecting that no coal flow falls into the second lower belt.

[0022] In S2, when a fault occurs in the main coal dropping pipe, the coal source equipment does not participate in the interlocking shutdown.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] In the device of the present invention, by installing an electromagnet mechanism and a movable coal flow baffle on the upper coal dropping pipe, and adding a bypass coal dropping pipe beside the main coal dropping pipe, the stable switching of the coal flow is realized when the main coal dropping pipe, the first lower-level belt and its interlocking equipment fail. Moreover, the front-end coal source equipment does not need to stop, avoiding the economic losses caused by the shutdown of the coal conveying equipment due to equipment failure. At the same time, the repeated start and stop of the front-end coal source equipment are also avoided, reducing the probability of failure of the front-end coal source equipment. The overall operation is stable and the reliability is strong. Secondly, the electromagnet mechanism, the first lower-level belt and the second lower-level belt are connected to the control system, improving the automation degree of the device. In addition, the coal dropping pipe bypass device of the present invention is improved on the original equipment, with less modification to the original equipment, low transformation cost and reasonable structure.

[0025] Further, the bypass coal dropping pipe is located on one side of the inlet of the upper coal dropping pipe, facilitating the coal flow to enter the bypass coal dropping pipe after the coal flow baffle switches the coal flow.

[0026] Further, the second belt chute, the second lower-level belt and the second feeding point buffer bed are all existing production line devices and can be directly used in the transformed equipment, further reducing the economic cost of equipment transformation.

[0027] Further, buffer beds are arranged below both the first lower-level belt and the second lower-level belt, playing a role in supporting and protecting the lower-level belts.

[0028] Further, pressure sensors are arranged on the buffer beds at the feeding points, and the pressure sensors are connected to the control system. It is convenient for the control system to collect the fault information of the coal dropping pipe and the coal flow information of the first lower-level belt and the second lower-level belt.

[0029] For the working method of the equipment of the present invention, when a fault occurs, the control system cuts off the power supply of the electromagnet mechanism and the first lower-level belt, and the first lower-level belt stops running. At the same time, the control system starts the second lower-level belt. The coal flow baffle rotates under the action of gravity into the magnetic field suction range of the drum magnetic separator and contacts the material distribution baffle, and the coal flow is introduced into the bypass coal dropping pipe and falls on the second lower-level belt, ensuring that the main coal dropping pipe and the first lower-level belt will not continuously accumulate coal after a fault, facilitating shutdown maintenance. At the same time, it can also ensure that the entire coal conveying device does not stop, reducing economic losses, avoiding the repeated start and stop of the front-end coal source equipment, reducing the probability of failure of the front-end coal source equipment, and enhancing the stability of equipment operation. In addition, after the fault is eliminated and the first lower-level belt runs stably, the electromagnet mechanism is switched on, and the system stops the operation of the second lower-level belt after detecting that there is no coal flow falling into the second lower-level belt, further enhancing the stability of equipment operation. And the entire fault adjustment process of the coal dropping pipe is participated by the control system, enhancing the automation degree of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0031] Among them, 1 - upper belt; 2 - drum-type iron remover; 3 - rotating shaft; 4 - electromagnet mechanism; 5 - counterweight iron block; 6 - coal flow baffle; 7 - material distribution baffle; 8 - main coal dropping pipe; 9 - first belt feeding chute; 10 - buffer bed at the first coal dropping point; 11 - first lower belt; 12 - bypass coal dropping pipe; 13 - upper-end coal dropping pipe; 14 - second belt feeding chute; 15 - buffer bed at the second coal dropping point; 16 - second lower belt. Specific implementation mode

[0032] The present invention will be further described below with reference to the accompanying drawings.

[0033] As Figure 1 shown, a bypass device for a coal dropping pipe includes a control system, a drum-type iron remover 2, an electromagnet mechanism 4, a coal flow baffle 6, a material distribution baffle 7, a main coal dropping pipe 8, a bypass coal dropping pipe 12, an upper-end coal dropping pipe 13, a first lower belt 11 and a second lower belt 16;

[0034] A drum-type iron remover 2 is arranged at the entrance of the upper-end coal dropping pipe 13, an electromagnet mechanism 4 and a coal flow baffle 6 are arranged at the top of the upper-end coal dropping pipe 13, the coal flow baffle 6 is movably connected to the upper-end coal dropping pipe 13, the lower end of the upper-end coal dropping pipe 13 communicates with the main coal dropping pipe 8 and the bypass coal dropping pipe 12, a material distribution baffle 7 is arranged at the communicating place of the main coal dropping pipe 8 and the bypass coal dropping pipe 12, the outlet of the main coal dropping pipe 8 is provided with a first lower belt 11, and the outlet of the bypass coal dropping pipe 12 is provided with a second lower belt 16;

[0035] When the coal flow baffle 6 is attracted to the electromagnet mechanism 4, the coal flow enters the main coal dropping pipe 8. When the electromagnet mechanism 4 loses power, the coal flow baffle 6 enters the gravitational range of the drum-type iron remover 2 under the action of gravity and closes when contacting the material distribution baffle 7, and the coal flow enters the bypass coal dropping pipe 12;

[0036] The control system is connected to the electromagnet mechanism 4, the first lower belt 11 and the second lower belt 16, and the control system is used to control the start and stop of the electromagnet mechanism 4, the first lower belt 11 and the second lower belt 16.

[0037] By installing an electromagnet mechanism 4 and a movable coal flow baffle 6 on the upper-end coal dropping pipe 13 and adding a bypass coal dropping pipe 12 beside the main coal dropping pipe 8, the stable switching of the coal flow is realized when the main coal dropping pipe 8, the first lower belt 11 and their interlocking equipment fail, and the front-end coal source equipment does not need to stop, avoiding the economic loss caused by the shutdown of the coal conveying equipment due to equipment failure. At the same time, the repeated start and stop of the front-end coal source equipment are also avoided, reducing the probability of failure of the front-end coal source equipment. The overall operation is stable and the reliability is strong. Secondly, the electromagnet mechanism 4, the first lower belt 11 and the second lower belt 16 are connected to the control system, improving the automation degree of the device.

[0038] Furthermore, the coal dropping pipe bypass device of the present invention is improved on the original equipment, with fewer changes to the original equipment, low transformation cost, and reasonable structure.

[0039] The coal flow baffle 6 is movably connected to the upper coal dropping pipe 13 through a rotating shaft 3, and a counterweight iron block 5 is fixedly arranged on the coal flow baffle 6.

[0040] The drum-type iron remover 2 is located at the end of the upper conveyor belt 1.

[0041] At the outlet of the main coal dropping pipe 8, a first belt guiding trough 9 is arranged, a first lower conveyor belt 11 is arranged at the bottom of the first belt guiding trough 9, and a first feeding point buffer bed 10 is arranged below the first lower conveyor belt 11.

[0042] A pressure sensor is arranged on the first feeding point buffer bed 10, and the pressure sensor is connected to the control system.

[0043] At the outlet of the bypass coal dropping pipe 12, a second belt guiding trough 14 is arranged, a second lower conveyor belt 16 is arranged at the bottom of the second belt guiding trough 14, and a second feeding point buffer bed 15 is arranged below the second lower conveyor belt 16.

[0044] A pressure sensor is arranged on the second feeding point buffer bed 15, and the pressure sensor is connected to the control system.

[0045] Preferably, feeding point buffer beds are arranged below both the first lower conveyor belt 11 and the second lower conveyor belt 16. The feeding point buffer beds play a role in supporting and protecting the lower conveyor belts, reducing damage to the lower conveyor belts. Secondly, pressure sensors are arranged on the feeding point buffer beds, and the pressure sensors are connected to the control system. This facilitates the control system to collect coal dropping pipe fault information and coal flow information of the first lower conveyor belt and the second lower conveyor belt, improving the automation level of the system.

[0046] Furthermore, the belt guiding troughs and the lower conveyor belts are all existing production line devices and can be directly used in the transformed equipment, further reducing the economic cost of equipment transformation.

[0047] A working method of a coal dropping pipe bypass device includes the following steps:

[0048] S1. When the coal dropping pipe is operating normally, the coal flow baffle 6 and the electromagnet mechanism 4 are in a suction state, and the coal flow enters the main coal dropping pipe 8 and falls on the first lower conveyor belt 11.

[0049] S2. When a fault occurs in the main coal dropping pipe 8, a signal is transmitted to the control system. The control system cuts off the power supply of the electromagnet mechanism 4 and the first lower conveyor belt 11, and the first lower conveyor belt 11 stops operating. At the same time, the control system starts the second lower conveyor belt 16. The coal flow baffle 6 rotates under the action of gravity into the magnetic field suction range of the drum-type iron remover 2 and contacts and closes with the material distribution baffle 7, and the coal flow is guided into the bypass coal dropping pipe 12 and falls on the second lower conveyor belt 16.

[0050] Preferably, when any device in the lower stage of the main coal dropping pipe fails and trips, a signal is sent into the control system. The control system trips the first lower belt 11 in a chain reaction, cuts off the power supply of the electromagnet mechanism 4, and simultaneously controls the start of the second lower belt 16 and all the downstream material conveying devices to continue conveying materials. The coal flow baffle 6 rotates clockwise under the action of gravity into the magnetic field attraction range of the drum type electromagnetic separator 2 and contacts and closes with the material distribution baffle 7. The coal flow is guided into the bypass coal dropping pipe 12 and falls onto the second lower belt 16.

[0051] In S2, when the main coal dropping pipe 8 fails, the coal source device does not participate in the chain reaction shutdown.

[0052] Preferably, when the main coal dropping pipe 8 or any device in its lower stage fails and trips, all the upstream material conveying devices of the main coal dropping pipe 8 do not participate in the chain reaction shutdown.

[0053] Furthermore, when a failure occurs, the control system cuts off the power supply of the electromagnet mechanism 4 and the first lower belt 11. The first lower belt 11 stops running. At the same time, the control system starts the second lower belt 16. The coal flow baffle 6 rotates into the magnetic field suction range of the drum type electromagnetic separator 2 under the action of gravity and contacts the material distribution baffle 7. The coal flow is guided into the bypass coal dropping pipe 12 and falls onto the second lower belt 16, ensuring that the main coal dropping pipe 8 and the first lower belt 11 will not continuously accumulate coal after a failure, facilitating shutdown maintenance. At the same time, it can also ensure that the entire coal conveying device does not stop running, reducing economic losses, avoiding repeated start-stop of the front-end coal source devices, reducing the probability of failure of the front-end coal source devices, and enhancing the stability of equipment operation.

[0054] S3. After the failure is eliminated, the control system first starts the first lower belt 11. After the control system detects that the first lower belt 11 is running stably, it then turns on the power supply of the electromagnet mechanism 4. The coal flow baffle 6 is re-attracted by the electromagnet mechanism 4, and the coal flow enters the main coal dropping pipe 8 and falls onto the first lower belt 11. After the system detects that there is no coal flow falling into the second lower belt 16, it stops the operation of the second lower belt 16.

[0055] Preferably, after the failure is eliminated, the control system first starts the first lower belt 11, and then sequentially starts the first lower belt 11 and all the downstream material conveying devices. After the control system monitors that the first lower belt 11 and all the downstream material conveying devices are running stably, it then turns on the power supply of the electromagnet mechanism 4. The coal flow baffle 6 is re-attracted by the electromagnet mechanism 4, and the coal flow enters the main coal dropping pipe 8 again and falls onto the first lower belt 11. After the system detects that there is no coal flow falling into the second lower belt 16, it stops the operation of the second lower belt 16.

[0056] After troubleshooting, when the first lower belt 11 runs stably, then turn on the electromagnet mechanism 4. After the system detects that there is no coal flow falling into the second lower belt 16, stop the operation of the second lower belt 16, which further enhances the stability of the equipment operation.

[0057] Furthermore, the entire fault adjustment process of the coal dropping pipe involves the control system, which enhances the automation degree of the device.

[0058] In summary, the above are only the preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A coal chute bypass device, characterized in that, It includes a control system, a drum-type iron remover (2), an electromagnet mechanism (4), a coal flow baffle (6), a material distribution baffle (7), a main coal dropping pipe (8), a bypass coal dropping pipe (12), an upper-end coal dropping pipe (13), a first lower-level belt (11) and a second lower-level belt (16); A drum-type iron remover (2) is arranged at the entrance of the upper-end coal dropping pipe (13), an electromagnet mechanism (4) and a coal flow baffle (6) are arranged at the top of the upper-end coal dropping pipe (13), the coal flow baffle (6) is movably connected to the upper-end coal dropping pipe (13), the lower end of the upper-end coal dropping pipe (13) communicates with the main coal dropping pipe (8) and the bypass coal dropping pipe (12), a material distribution baffle (7) is arranged at the communicating place of the main coal dropping pipe (8) and the bypass coal dropping pipe (12), a first lower-level belt (11) is arranged at the outlet of the main coal dropping pipe (8), and a second lower-level belt (16) is arranged at the outlet of the bypass coal dropping pipe (12); When the coal flow baffle (6) is attracted by the electromagnet mechanism (4), the coal flow enters the main coal dropping pipe (8). When the coal flow baffle (6) enters the gravitational range of the drum-type iron remover (2) and contacts the material distribution baffle (7), the coal flow enters the bypass coal dropping pipe (12); The control system is connected to the electromagnet mechanism (4), the first lower-level belt (11) and the second lower-level belt (16), and is used to control the start and stop of the electromagnet mechanism (4), the first lower-level belt (11) and the second lower-level belt (16); The coal flow baffle (6) is movably connected to the upper-end coal dropping pipe (13) through a rotating shaft (3), and a counterweight iron block (5) is fixedly arranged on the coal flow baffle (6).

2. The coal dropping pipe bypass device according to claim 1, characterized in that, The drum-type iron remover (2) is located at the end of the upper-level belt (1).

3. The coal dropping pipe bypass device according to claim 1, characterized in that, A first belt guiding trough (9) is arranged at the outlet of the main coal dropping pipe (8), the first lower-level belt (11) is arranged at the bottom of the first belt guiding trough (9), and a first dropping point buffer bed (10) is arranged below the first lower-level belt (11).

4. The coal dropping pipe bypass device according to claim 3, characterized in that, A pressure sensor is arranged on the first dropping point buffer bed (10), and the pressure sensor is connected to the control system.

5. The coal dropping pipe bypass device according to claim 1, characterized in that, A second belt guiding trough (14) is arranged at the outlet of the bypass coal dropping pipe (12), the second lower-level belt (16) is arranged at the bottom of the second belt guiding trough (14), and a second dropping point buffer bed (15) is arranged below the second lower-level belt (16).

6. The coal dropping pipe bypass device according to claim 5, characterized in that, A pressure sensor is arranged on the second dropping point buffer bed (15), and the pressure sensor is connected to the control system.

7. The working method of a coal dropping pipe bypass device according to claim 1, characterized in that It includes the following steps: S1. When the coal dropping pipe operates normally, the coal flow baffle (6) and the electromagnet mechanism (4) are in an attracted state, and the coal flow enters the main coal dropping pipe (8) and falls on the first lower-level belt (11); S2. When a fault occurs in the main coal dropping pipe (8), a signal is transmitted to the control system. The control system cuts off the power supplies of the electromagnet mechanism (4) and the first lower-level belt (11), and the first lower-level belt (11) stops running. At the same time, the control system starts the second lower-level belt (16). The coal flow baffle (6) enters the magnetic field attraction range of the drum-type iron remover (2) under the action of gravity and contacts and closes with the material distribution baffle (7), and the coal flow is guided into the bypass coal dropping pipe (12) and falls on the second lower-level belt (16); S3. After troubleshooting, the control system first starts the first lower belt (11). After the control system detects that the first lower belt (11) is running stably, it then turns on the power supply of the electromagnet mechanism (4). The coal flow baffle (6) is re-attracted to the electromagnet mechanism (4), and the coal flow enters the main coal dropping pipe (8) and falls onto the first lower belt (11). The system stops the operation of the second lower belt (16) after detecting that no coal flow falls into it.

8. The working method of a coal dropping pipe bypass device according to claim 7, characterized in that, In S2, when a failure occurs in the coal dropping pipe, the coal source equipment does not participate in the interlock shutdown.

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