Coal chute coal blocking detection device

Abstract

The utility model discloses a kind of coal chute coal blocking detection devices, including coal chute, the upper segment and lower segment of coal chute are equipped with two mutually parallel and transverse rotation pivot, pivot is equidistantly distributed with guide plate, for rotating with coal flow, encoder is installed on the outer wall of coal chute and connected to the outer end of pivot.The utility model belongs to coal chute anti-blocking technical field, specifically refers to a kind of coal chute coal blocking detection device.

Description

Technical Field

[0001] This utility model belongs to the field of coal chute anti-blocking technology, specifically referring to a coal chute blockage detection device. Background Technology

[0002] In coal conveying systems, coal chutes play a crucial role in transporting raw coal from one location to another, and are commonly found in thermal power plants, coal mines, and other similar sites. When the raw coal has high moisture content or high viscosity, it easily adheres and accumulates on the walls of the coal chutes, eventually causing coal blockage. Once the coal chutes are blocked, the continuously transported raw coal will accumulate and overflow at the inlet, greatly affecting the safe and stable operation of the coal conveying system.

[0003] Currently, there are various methods for detecting coal blockage in coal chutes on the market: some use contact detection, such as rotary paddle and movable baffle types. The rotary paddle level switch works by a motor driving a blade to rotate inside the coal chute. When the blade is buried by coal and reaches a certain resistance, it stops rotating, and the switch sends a blockage signal. The PLC for coal conveying receives the signal and shuts down the corresponding conveyor belt. However, it is prone to false alarms because coal adheres to the switch. The movable baffle type triggers a signal by pushing a baffle displacement due to material accumulation; however, its sensitivity is easily affected by the impact force and accumulation angle of the material, often resulting in false alarms when the material flow rate is unstable. Non-contact detection methods, such as radio frequency admittance and tuning fork types, avoid direct contact between mechanical parts and materials. However, in the complex electromagnetic environment of power plant coal conveying, the signal is easily interfered with, leading to inaccurate detection results and failing to reliably guarantee the safe operation of the coal conveying system. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, this utility model provides a coal blockage detection device for coal chutes, which effectively solves the problem of poor performance of existing coal blockage detection methods.

[0005] To achieve the above functions, the technical solution adopted by this utility model is as follows: a coal chuting pipe blockage detection device, including a coal chuting pipe, wherein the upper and lower sections of the coal chuting pipe are respectively provided with two parallel and laterally rotating shafts, and guide plates are evenly distributed on the shafts for rotating with the coal flow. An encoder connected to the outer end of the shafts is installed on the outer wall of the coal chuting pipe to monitor the rotation speed in real time.

[0006] Preferably, the guide plate is a 45° inclined plate, and the upper and lower sections of the guide plate are staggered.

[0007] Preferably, the encoder is connected to the rotating shaft via a flexible coupling.

[0008] Preferably, a drive motor is installed on the outer wall of the coal chute at the bottom of the lower section of the rotating shaft. The output end of the drive motor is connected to a connecting shaft that penetrates the side wall of the coal chute. An L-shaped pusher is fixed at one end of the connecting shaft. Several levers are fixed longitudinally on the pusher for clearing the material in the coal chute after a coal blockage alarm is triggered.

[0009] Preferably, the system further includes a control system, which includes a microprocessor for receiving rotational speed signals from the upper and lower encoders.

[0010] Preferably, the control system further includes an alarm.

[0011] Compared with the prior art, the present invention adopts the above structure and achieves the following beneficial effects: The present application uses the speed difference between the upper and lower sets of horizontally rotatable connecting shafts and guide plates to judge coal blockage, which can more sensitively capture the speed change caused by material accumulation in the early stage of coal blockage, and effectively avoid misjudgment caused by material characteristics or impact and environmental interference. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of a coal blockage detection device for a coal chute proposed in this utility model. Figure 1 ;

[0013] Figure 2 This is a schematic diagram of the overall structure of a coal blockage detection device for a coal chute proposed in this utility model. Figure 2 ;

[0014] Figure 3 This is a schematic diagram of the overall structure of a coal blockage detection device for a coal chute proposed in this utility model. Figure 3 ;

[0015] Figure 4 This is a control system block diagram of a coal blockage detection device for a coal chute proposed in this utility model.

[0016] The components include: 1. Coal chute, 2. Rotating shaft, 3. Guide plate, 4. Encoder, 5. Control system, 6. Drive motor, 7. Connecting shaft, 8. Pusher frame, 9. Lever, 10. Microprocessor, and 11. Alarm. Detailed Implementation

[0017] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0018] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The utility model will be further described in detail below with reference to the accompanying drawings.

[0019] like Figure 1-4 As shown, the present invention proposes a coal chute blockage detection device, which includes a coal chute 1. The upper and lower sections of the coal chute 1 are respectively provided with two parallel and laterally rotating shafts 2. Guide plates 3 are evenly distributed on the shafts 2 for rotating with the coal flow. The guide plates 3 are 45° inclined plates, and the upper and lower guide plates 3 are staggered to make the driving force of the coal flow on the guide plates 3 more uniform and reduce instantaneous speed fluctuations. An encoder 4 is installed on the outer wall of the coal chute 1 and connected to the outer end of the shafts 2 to monitor the speed in real time. The encoder 4 is connected to the shafts 2 through a flexible coupling to increase the service life of the encoder 4.

[0020] like Figure 2 , 3 As shown, a drive motor 6 is installed on the outer wall of the coal chute 1 at the bottom of the lower section of the rotating shaft 2. The output end of the drive motor 6 is connected to a connecting shaft 7 that passes through the side wall of the coal chute 1. An L-shaped pusher 8 is fixed at one end of the connecting shaft 7. Several levers 9 are fixed longitudinally on the pusher 8. The drive motor 6 drives the connecting shaft 7, the pusher 8 and the levers 9 to rotate, which is used to clear the material in the coal chute 1 after the coal blockage alarm.

[0021] like Figure 4 As shown, it also includes a control system 5, which includes a microprocessor 10 for receiving the speed signals of the upper and lower encoders 4, calculating the speed difference through a built-in algorithm, judging the coal blockage status, and starting the drive motor 6. The control system 5 also includes an alarm 11 to trigger an alarm, so that the operator can handle it in a timely manner.

[0022] In actual use, turn on the power, start the coal conveying system, and let the coal drop pipe 1 drop coal normally. At this time, the speed at which the upper and lower encoders 4 detect the rotation of the guide plate 3 and the rotating shaft 2 should be basically the same. If there is a deviation, fine-tune the position of the encoder 4 or calibrate its parameters so that the initial speed difference is within a reasonable threshold (such as ±5%).

[0023] During normal operation, the material continuously impacts the guide plate 3, causing the upper and lower rotating shafts 2 to rotate stably. The encoder 4 monitors the rotation speed in real time and transmits the signal to the control system 5. The microprocessor 10 calculates the ratio of the upper and lower rotation speeds and maintains it within the range of 1±0.05 as a normal state.

[0024] When coal blockage occurs in the coal chute 1, and the ratio of the upper and lower rotation speeds exceeds the normal range, once the speed difference is detected to exceed the set threshold (e.g., the ratio deviates from the baseline by ±0.15 and lasts for more than 3 seconds), the control system 5 immediately triggers the alarm 11 to issue an alarm and sends an alarm signal to the central control room. At the same time as the alarm sounds, the control system 5 drives the motor 6 to run, and the motor drives the connecting shaft 7 to rotate, causing the pusher frame 8 to rotate. The insert rod stirs the material to clear the blockage. If coal blockage still exists, the machine can be stopped for inspection and clearing.

[0025] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A coal blockage detection device for a coal chute, characterized in that: It includes a coal chute (1), and the upper and lower sections of the coal chute (1) are respectively provided with two parallel and transversely rotating shafts (2). The rotating shafts (2) are evenly spaced with guide plates (3) for rotating with the coal flow. An encoder (4) connected to the outer end of the rotating shaft (2) is installed on the outer wall of the coal chute (1) to monitor the rotation speed in real time.

2. The coal blockage detection device for a coal chute according to claim 1, characterized in that: The guide plate (3) is a 45° inclined plate, and the upper and lower sections of the guide plate (3) are staggered.

3. The coal blockage detection device for a coal chute according to claim 2, characterized in that: The encoder (4) is connected to the rotating shaft (2) via a flexible coupling.

4. A coal blockage detection device for a coal chute according to any one of claims 1-3, characterized in that: A drive motor (6) is installed on the outer wall of the coal drop pipe (1) at the bottom of the lower section shaft (2). The output end of the drive motor (6) is connected to a connecting shaft (7) that passes through the side wall of the coal drop pipe (1). An L-shaped pusher (8) is fixed at one end of the connecting shaft (7). Several levers (9) are fixed longitudinally on the pusher (8) for clearing the material in the coal drop pipe (1) after the coal blockage alarm.

5. The coal blockage detection device for a coal chute according to claim 4, characterized in that: It also includes a control system (5), which includes a microprocessor (10) for receiving rotational speed signals from the upper and lower encoders (4).

6. The coal blockage detection device for a coal chute according to claim 5, characterized in that: The control system (5) also includes an alarm (11).

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