Negative pressure dust removal discharge hopper

Abstract

The utility model relates to a negative pressure dust removal unloading hopper, including unloading hopper, the top of unloading hopper is equipped with dust removal system no.

Description

Technical Field

[0001] This utility model relates to the field of environmental protection equipment for bulk cargo loading and unloading, and in particular to a negative pressure dust removal unloading hopper. Background Technology

[0002] In the loading and unloading operations of bulk cargo (such as coal, cement, ore, and grain) in industries such as ports, mines, and building materials, unloading hoppers are key equipment for material transfer. However, during the unloading process, factors such as the impact of falling materials and air disturbance not only generate a large amount of dust, causing serious pollution to the working environment, but also cause irreversible damage to the respiratory system of operators, increasing the risk of occupational diseases.

[0003] Traditional dust collection devices often use single-component negative pressure systems with limited and uneven coverage. Dust at the top of the unloading hopper can easily escape through edge gaps, resulting in a low actual dust capture rate. A significant amount of dust still diffuses into the work area, affecting dust removal efficiency. Furthermore, traditional dust collection devices require the fan to operate continuously at its rated speed (regardless of whether the grab is in the unloading area). This leads to significant energy waste during a single work cycle (including the grab's round-trip time), failing to meet energy-saving requirements and necessitating continuous fan operation, thus hindering energy conservation. Utility Model Content

[0004] This utility model addresses the shortcomings of existing technologies by providing a negative pressure dust removal and unloading hopper. The specific technical solution is as follows: A negative pressure dust removal unloading hopper includes an unloading hopper body. Multiple dust removal systems are provided around the top side of the unloading hopper body. Each dust removal system includes an upper box, a middle box, a dust hopper, and a negative pressure section connected sequentially from top to bottom. A tube sheet is connected between the bottom of the upper box and the top of the middle box. The tube sheet has several through holes, and filter bags are installed through the through holes via filter cages. The negative pressure section includes a blower and a negative pressure main pipe. The exhaust end of the blower is connected to the negative pressure main pipe through a pipe. Several negative pressure branch pipes are connected to the negative pressure main pipe. One end of each negative pressure branch pipe extends into the interior of the upper housing. The ash hopper is connected to the material inlet of the unloading hopper through a pipe. Preferably, it also includes an electrical control system, which includes a PLC controller installed in an electrical cabinet. The first fan is connected to the PLC controller. The first dust removal system has eight sets located on the outside of the unloading hopper. The motor included in the first fan is a variable frequency motor to facilitate wind speed adjustment.

[0005] Preferably, the system also includes a radar sensing system located above the unloading hopper. The PLC controller can control the speed of the blower in at least four stages based on the grab position signal transmitted by the radar sensing system. In the first stage, when the radar sensing system does not detect the grab, the blower is in a silent sleep state. In the second stage, when the radar sensing system detects that the grab has entered the preset warning zone, the PLC controller controls the blower to start and operate in a low-volume, low-noise mode to adsorb the initial dust in advance. In the third stage, when the radar sensing system determines that the grab is fully open and the material has begun to pour, the PLC controller controls the blower to switch to full speed instantly and output the maximum designed air volume to form a strong negative pressure dust collection. In the fourth stage, when the radar sensing system detects that the grab has left, the PLC controller controls the blower to immediately reduce the frequency to a low-volume standby state.

[0006] Preferably, the radar sensing system includes a signal processing unit, a communication interface unit, and multiple microwave radar probes. The processing unit is used to receive and process the raw echo signals from the microwave radar probes, and the communication interface unit is used to transmit the processed grab bucket signals to the PLC controller. The detection distance between the radar sensing system and the unloading hopper is not less than 10 meters.

[0007] Preferably, the discharge port of the unloading hopper is provided with a discharge gate, and the bottom of the unloading hopper is connected to a telescopic chute.

[0008] Preferably, the system also includes a second dust removal system, which includes a second fan installed on the side of the telescopic chute. The second fan is electrically connected to a PLC controller. The PLC controller can control the second fan to start first before the unloading hopper is fully loaded and the discharge gate is opened, so as to capture the small amount of dust escaping from the telescopic chute. After the discharge gate is closed, the PLC controller controls the second fan to stop automatically.

[0009] Preferably, it also includes a dust removal assembly, which includes an air storage tank, a dust removal pulse meter, and multiple nozzles located inside the upper housing. The bottom end of one nozzle is coaxially aligned with a filter bag, and the top end of the nozzle is connected to the air storage tank via an electromagnetic pulse valve. Both the electromagnetic pulse valve and the dust removal pulse meter are connected to a controller. The dust removal pulse meter is used to control the blowing action of the electromagnetic pulse valve in accordance with the operating status of the dust removal fan.

[0010] Preferably, it also includes a support frame, the unloading hopper is mounted on the support frame, the bottom of the support frame is provided with a traction and walking assembly, the traction and walking assembly includes a traction frame, and the bottom of the traction frame is equipped with walking wheels.

[0011] Preferably, the support frame is also equipped with a ladder platform and an operating room.

[0012] Preferably, a differential pressure sensor is installed between the upper housing and the middle housing, and the differential pressure sensor is electrically connected to the PLC controller. Preferably, a vibration motor is installed on the unloading hopper and / or ash hopper, and the vibration motor is connected to a PLC controller.

[0013] The beneficial effects of this utility model are: 1. Through the cooperation of eight dust removal systems and the negative pressure unit, the dust removal system is evenly distributed around the top of the unloading hopper. Combined with the fan, negative pressure main pipe and branch pipes of the negative pressure unit, a uniform negative pressure of -800~-1000Pa is formed in the upper box, which improves the dust capture rate, greatly reduces the escape of dust from the unloading port, controls dust pollution, and meets the GB 16297 standard.

[0014] 2. By linking the radar sensing system with the variable frequency fan, the speed control of the four stages is achieved. During one operation cycle, the fan does not need to be at constant full load. Compared with continuous full-speed operation, the overall power saving can reach more than 80%. The energy saving effect is even more significant when the grab bucket has a long round-trip distance and the single operation cycle is extended.

[0015] 3. By combining the filter bag with the dust removal component, compressed air is sprayed onto the filter bag through the nozzle (0.1-0.2s) to thoroughly remove the accumulated dust, stabilize the filtration resistance at 1200-1500Pa, effectively maintain the filtration efficiency, and extend the service life of the filter bag.

[0016] 4. By connecting the unloading hopper with a vibrating motor, which is installed at the bottom of the unloading hopper and has a vibration frequency of 50Hz, it can effectively prevent loose materials from accumulating in the hopper, avoid affecting the continuity of operation, and reduce the frequency of manual cleaning.

[0017] 5. By combining the unloading hopper with the traveling wheels and the telescopic chute, the traveling wheels of the unloading hopper allow the device to move flexibly around the work site and adapt to different unloading points; the telescopic chute can adapt to different transportation equipment such as trucks and conveyor belts, improving the equipment's adaptability to diverse work scenarios and reducing operational limitations caused by fixed positions.

[0018] 6. By installing a second fan on the side of the telescopic chute, a small amount of dust escaping from the telescopic chute during unloading can be captured, further improving the dust collection effect. Attached Figure Description

[0019] Figure 1 This is a front view of the overall structure of this utility model; Figure 2 This is a side view of the overall structure of this utility model; Figure 3 This is a schematic diagram of the overall structure of this utility model; Figure 4 This is a structural schematic diagram of the upper box and the middle box of this utility model; Figure 5 This is a schematic diagram of the traction and walking component in this utility model.

[0020] Attached reference numerals: 1. Unloading hopper body; 100. Telescopic chute; 101. Traveling wheel; 2. Dust removal system one; 20. Fan one; 201. Negative pressure main pipe; 202. Negative pressure branch pipe; 21. Upper box; 22. Middle box; 23. Air storage tank; 231. Electromagnetic pulse valve; 232. Nozzle; 24. Tube plate; 241. Through hole; 242. Filter bag; 3. Hopper support frame; 4. Fan two; 5. Traction frame; 51. Traveling wheel; 6. Hydraulic support leg; 7. Climbing platform; 8. Control room. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0022] Example Please refer to Figures 1-2 The negative pressure dust removal unloading hopper includes an unloading hopper body 1, a dust removal system 2, a negative pressure unit, a dust removal component, and an electrical control system. Specifically, the unloading hopper 1 has a funnel-shaped structure that is wider at the top and narrower at the bottom (welded with Q235B steel plate). The top is an open unloading area, and the bottom is connected to a telescopic chute 100 (made of wear-resistant rubber material, used to adjust the unloading height) via a flange. The bottom of the support frame on both sides of the unloading hopper 1 is equipped with a traveling wheel 51 with brakes (for easy overall movement), and a vibration motor (model YZU-5-4, power 0.25kW) is installed on the outer wall of the unloading hopper 1 to prevent material accumulation inside the hopper. It also includes a radar sensing system located above the unloading hopper 1. The PLC controller can control the speed of the fan 20 in at least four stages based on the grab position signal transmitted by the radar sensing system. In the first stage, when the radar sensing system does not detect the grab, the fan is in a silent sleep state. In the second stage, when the radar sensing system detects that the grab has entered the preset warning zone, the PLC controller controls the fan 20 to start and run in a low-volume, low-noise mode to adsorb the initial dust in advance. In the third stage, when the radar sensing system determines that the grab is fully open and the material has begun to pour, the PLC controller controls the fan 20 to instantly switch to full speed operation and output the designed maximum air volume to form a strong negative pressure dust collection. In the fourth stage, when the radar sensing system detects that the grab has left, the PLC controller controls the fan 20 to immediately reduce the frequency to a low-volume standby state.

[0023] The radar sensing system includes a signal processing unit, a communication interface unit, and multiple microwave radar probes. The processing unit is used to receive and process the raw echo signals from the microwave radar probes. The communication interface unit is used to transmit the processed grab bucket signals to the PLC controller. The detection distance between the radar sensing system and the unloading hopper 1 is not less than 10 meters.

[0024] Specifically, the microwave radar probe, serving as the signal acquisition end, is installed in multiple sets above the unloading hopper 1, with a detection distance of no less than 10 meters from the unloading hopper 1. Its core function is to transmit microwave signals and receive the raw echo signals from the grab bucket. By analyzing the frequency and phase changes of the echoes, it identifies the position of the grab bucket (such as whether it has entered the warning zone, whether it is fully open, or whether it has left, etc.), providing raw data for subsequent signal processing.

[0025] The signal processing unit is electrically connected to multiple microwave radar probes. Its core function is to receive the raw echo signals transmitted by each probe, process them through existing technologies such as filtering, amplification, and phase calculation, eliminate environmental interference (such as dust and obstruction by other equipment), accurately identify and determine the real-time status of the grab bucket (four stages: hibernation, alert, unloading, and departure), and convert the raw signals into identifiable grab bucket position logic signals.

[0026] One end of the communication interface unit is electrically connected to the signal processing unit, and the other end communicates with the PLC controller of the electrical control system through a wire. Its function is to establish a connection bridge between the signal processing unit and the PLC controller, ensuring that the processed grab position signal is stably and transmitted to the PLC in real time, providing a trigger basis for the four-stage speed control (sleep → low wind → full speed → standby) of the fan-20.

[0027] Specifically, the dust removal system 2 has 8 sets (evenly distributed around the top circumference of the unloading hopper 1), each set including an upper box 21, a middle box 22 and an ash hopper connected in a sealed manner from top to bottom. The upper box 21 is a closed cavity with an inspection port at the top (for easy maintenance); the middle box 22 can be cylindrical, with a tube sheet 24 (6mm thick, Q235B material) horizontally arranged inside, and 10-15 through holes 241 evenly opened on the tube sheet 24. Each through hole 241 has a filter bag 242 (using PPS high-temperature resistant filter material, 1.5m in length, filtration accuracy ≤1μm) fixed in it by a filter cage. Specifically, the ash hopper is conical (60° cone angle to reduce material accumulation dead angles) and has a discharge port at the bottom. The negative pressure section includes a fan 20, a negative pressure main pipe 201, and negative pressure branch pipes 202. The fan 20 can be a centrifugal type (model 4-72-11, air volume 10000m³ / h, air pressure 3000Pa), installed on a bracket on the side of the dust removal system 2. One end of the negative pressure main pipe 201 is connected to the exhaust end of the fan through a pipe, and the other end extends horizontally to the top of the dust removal system 2. The negative pressure branch pipe 202 has 2-10 branches, one end of which is connected to the negative pressure main pipe 201, and the other end is vertically inserted through the top of the upper box 21 and extends into it, which is used to form negative pressure in the upper box 21. It also includes a second dust collection system (bottom dust collection), located on the side of the telescopic chute 100, including a second fan 4 and a dust collection hood. The second fan 4 is connected to the dust collection hood through a pipe and is used to capture a small amount of dust escaping from the telescopic chute 100 during unloading. The second fan 4 is electrically connected to a PLC controller. The PLC controller can control the second fan 4 to start first before the unloading hopper 1 is fully loaded and the discharge gate is opened, so as to capture a small amount of dust escaping from the telescopic chute 100. When the discharge gate is closed, the PLC controller controls the second fan 4 to automatically stop, which can effectively save energy.

[0028] The dust removal assembly includes an air storage tank 23, an electromagnetic pulse valve 231, and a blow nozzle 232. The air storage tank 23 (volume 0.3m³, with an oil-water separator and a pressure regulating valve, working pressure 0.6-0.8MPa) is installed on the top of the upper housing 21. More specifically, the air storage tank 23 mainly consists of a main container, an oil-water separator, a pressure regulating device, and auxiliary connecting parts. The main container is welded from Q235B steel plate and is cylindrical (0.3m³ volume), providing a stable compressed air reserve for dust removal. The oil-water separator is connected to the air inlet of the air storage tank 23 via a flange. It contains a filter element and a drain valve to filter moisture and oil from the compressed air, preventing impurities from entering the solenoid pulse valve 231 and causing blockage or damage. The pressure regulating device, installed on the air outlet pipe of the air storage tank 23, includes a pressure gauge and a pressure reducing valve, which can adjust the inlet pressure to the working pressure required for dust removal, ensuring stable blowing pressure. It also includes an air inlet (with a check valve), an air outlet connected to the solenoid pulse valve 231 via a pipe, and a drain valve (installed at the bottom for periodic discharge of residual liquid). All interfaces are sealed with flanges or threads to ensure airtightness.

[0029] The aforementioned components work together to provide clean, stable-pressure compressed air to the electromagnetic pulse valve 231 and nozzle 232 of the dust removal assembly, ensuring the dust removal effect of the filter bag 242.

[0030] The electromagnetic pulse valve 231 (model DMF-Z-20, response time ≤0.1s) has 10-15 units (corresponding one-to-one with the filter bag 242), and one end is connected to the air storage tank 23 through a pipe; One end of the nozzle 232 is connected to the other end of the electromagnetic pulse valve 231, and the other end extends vertically downward through the bottom of the upper housing 21 and is coaxially aligned with the top of the filter bag 242 for cleaning by jetting. In an optional embodiment of this application, an ash unloading system is also included. The ash unloading system includes a screw conveyor and an airlock valve. The input end of the screw conveyor is connected to the ash hopper outlet, and the output end of the screw conveyor is connected to the unloading hopper body 1, so that the collected dust can be returned to the unloading hopper to avoid secondary processing. The airlock valve is located between the ash hopper and the screw conveyor. The airlock valve is installed between the ash hopper and the screw conveyor. The model can be YJD-20. The upper and lower valve plates alternately open and close to ensure that the negative pressure of the system does not leak during ash unloading. In an optional embodiment of this application, a flow guiding component is also included. The flow guiding component includes multiple arc-shaped flow guiding plates disposed inside the ash hopper and distributed alternately from top to bottom along the inner wall of the ash hopper. Large dust particles are blocked by gravity and the flow guiding plates and fall to the bottom of the ash hopper, while fine dust rises with the airflow and enters the middle chamber 22, thereby achieving dust classification and reducing the clogging of the filter bag 242.

[0031] Specifically, the electrical control system includes a PLC controller (model S7-200 SMART), a radar sensing system (installed on the top of the unloading hopper 1, with a detection distance of 10-20m), a differential pressure sensor (installed between the upper housing 21 and the middle housing 22, with a measurement range of 0-3000Pa), and a touch screen; the fan, vibration motor, electromagnetic pulse valve 231, drive motor, radar sensor, and differential pressure sensor are all electrically connected to the PLC controller.

[0032] The support frame can be welded from H-beams. The unloading hopper 1 is fixed to the top of the support frame with bolts. A ladder platform 7 is welded to one side of the support frame for easy maintenance, and an operating room with a built-in touch screen and control buttons is installed on the other side. Hydraulic support legs 6 are installed at the four corners of the bottom of the support frame (to support the ground during operation and prevent the device from shaking).

[0033] The towing frame 5 is made of channel steel, with one end welded to the bottom of the support frame and the other end equipped with a towing hook (for trailers). The device has four wheels (two fixed wheels and two swivel wheels) and a braking device, which facilitates the movement of the device within the work area.

[0034] The PLC controller is installed in the electrical cabinet. The PLC controller (model S7-200 SMART) is the core. The sensor module of this application includes a radar sensing system (installed on the top of the unloading hopper 1, containing multiple sets of microwave radar probes, with a detection distance of 10-25m and a signal processing accuracy of ±0.1m), a differential pressure sensor (installed between the upper box 21 and the middle box 22, model MPM480, with a measurement range of 0-3000Pa), and a level gauge (installed inside the ash hopper, model UZK-80, with a measurement range of 0-1.5m). The PLC controller implements four-stage speed control for the blower 120 (sleep → low speed → full speed → standby) based on the radar sensing system signal; triggers the dust removal component based on the differential pressure sensor signal; and starts the ash unloading system based on the level gauge signal, thus achieving full-process automation. Working principle 1. Assignment Preparation Stage: The device is moved to the unloading point by the traction frame 5, the hydraulic support legs 6 are activated to support the ground, and the traveling wheels 51 are locked. Adjust the length of the telescopic chute 100 to match the unloading height (e.g., extend 500mm when docking with a truck, and extend 200mm when docking with a conveyor belt). The control room initiates a system self-test: the PLC controller checks the status of the fan, valves, and sensors, clears residual dust from the ash hopper, and ensures that the equipment is free of abnormalities.

[0035] 2. Dust removal operation stage (four-stage fan control): Phase 1 (Sleep): The radar sensing system does not detect the grab bucket (distance > 20-25m), the fan 120 is in a silent state (power consumption ≤ 100W), and the system maintains a slight negative pressure (-100Pa). Phase Two (Low Wind): When the radar detects that the grab bucket has entered the warning zone (10-25m), the PLC controls the fan 120 to start, and the speed increases to 500r / min (air volume 4000m³ / h) to adsorb the initial dust at the material inlet in advance. Phase 3 (Full Speed): The radar determines that the grab bucket is fully open and the material begins to pour (distance ≤10m). The fan 20 instantly rises to 1500r / min (air volume 12000m³ / h), and the upper chamber 21 forms a negative pressure of -900Pa. Dust-laden air enters the middle chamber 22 through the dust hopper. Large dust particles are blocked by the guide plate and fall into the dust hopper, while fine dust is intercepted by the filter bag 242. Clean air is discharged through the negative pressure branch pipe 202 and the main pipe by the fan 20. At the same time, the PLC controls the dust removal pulse device to start, and the electromagnetic pulse valve 231 blows once every 30 seconds to remove the dust accumulated in the filter bag 242. Phase 4 (Standby): The radar detects that the grab bucket has left (distance > 25m), the fan speed of fan 120 drops to 300r / min (air volume 2500m³ / h), maintains a slight negative pressure in the system, and waits for the next operation.

[0036] 3. Bottom unloading and dust replenishment stage: After the unloading hopper 1 is fully loaded, the PLC controls the second fan 4 to start 10 seconds in advance (to capture dust at 100 locations in the telescopic chute), and then the discharge gate is opened to unload the material. During the unloading process, the vibrating motor is started to prevent material from accumulating in the hopper; when the material level gauge in the ash hopper detects that the material level is ≥80%, the double-layer airlock valve and the screw conveyor are started to return the dust to the unloading hopper body 1. After unloading is completed, close the discharge gate and stop the second blower after a 5-second delay.

[0037] 4. Shutdown and maintenance phase: Before shutting down the system, a manual dust removal procedure is executed. When the differential pressure sensor detects that the resistance of the filter bag 242 is ≥1500Pa, the PLC controller starts the dust removal procedure: the fan 20 stops exhausting, the electromagnetic pulse valve 231 opens in sequence (each valve opens for 0.1s), and the compressed air in the air storage tank 23 is sprayed into the filter bag 242 through the nozzle 232, causing the filter bag 242 to expand and shake instantly, and the surface dust falls into the ash hopper. Then, the screw conveyor is run to open the air lock valve and remove the dust in the ash hopper and collect it into the unloading hopper 1.

[0038] Check the wear of filter bag 242 monthly (observe through the inspection port) and replace damaged filter bag 242; clean the dust accumulated on the fan impeller and replenish the bearing grease quarterly; conduct flaw detection on the weld seams of the support frame annually to ensure structural safety.

[0039] By rationally designing the structure of the unloading hopper and standardizing its operation, the negative pressure dust removal system can be ensured to operate continuously and stably during the unloading of bulk materials in the unloading hopper, while reducing maintenance costs and the risk of secondary pollution.

[0040] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A negative pressure dust removal and unloading hopper, characterized in that, The system includes a discharge hopper (1), and a plurality of dust removal systems (2) are provided around the top side of the discharge hopper (1). The dust removal system (2) includes an upper box (21), a middle box (22), a dust hopper and a negative pressure section connected from top to bottom. A tube sheet (24) is connected between the bottom of the upper box (21) and the top of the middle box (22). The tube sheet (24) is provided with a plurality of through holes (241). The through holes (241) are installed through a filter cage. The negative pressure section includes a blower (20) and a negative pressure main pipe (201). The exhaust end of the blower (20) is connected to the negative pressure main pipe (201) through a pipe. Several negative pressure branch pipes (202) are connected to the negative pressure main pipe (201). One end of the negative pressure branch pipe (202) extends into the interior of the upper box (21). The ash hopper is connected to the material receiving port of the unloading hopper (1) through a pipe.

2. The negative pressure dust removal unloading hopper according to claim 1, characterized in that: It also includes an electrical control system, which includes a PLC controller installed in an electrical cabinet. The fan (20) is connected to the PLC controller. The dust removal system (2) has eight sets located on the outside of the unloading hopper (1). The motor included in the fan (20) is a variable frequency motor to facilitate wind speed adjustment.

3. The negative pressure dust removal unloading hopper according to claim 2, characterized in that: It also includes a radar sensing system located above the unloading hopper (1). The PLC controller can control the speed of the fan (20) in at least four stages according to the grab position signal transmitted by the radar sensing system. In the first stage, when the radar sensing system does not detect the grab, the fan (20) is in a silent sleep state. In the second stage, when the radar sensing system detects that the grab has entered the preset warning zone, the PLC controller controls the fan (20) to start and run in a low air volume and low noise mode to adsorb the initial dust in advance. In the third stage, when the radar sensing system determines that the grab is fully open and the material begins to pour, the PLC controller controls the fan (20) to switch to full speed operation instantly and output the maximum designed air volume to form a strong negative pressure dust collection. In the fourth stage, when the radar sensing system detects that the grab has left, the PLC controller controls the fan (20) to immediately reduce the frequency to a low air volume standby state.

4. The negative pressure dust removal unloading hopper according to claim 3, characterized in that: The radar sensing system includes a signal processing unit, a communication interface unit, and multiple microwave radar probes. The processing unit is used to receive and process the raw echo signals from the microwave radar probes. The communication interface unit is used to transmit the processed grab bucket signals to the PLC controller. The distance between the radar sensing system and the unloading hopper (1) is not less than 10 meters.

5. The negative pressure dust removal unloading hopper according to claim 4, characterized in that: The discharge port of the unloading hopper (1) is provided with a discharge gate, and the bottom of the unloading hopper (1) is connected to a telescopic chute (100).

6. The negative pressure dust removal unloading hopper according to claim 5, characterized in that: It also includes a second dust removal system, which includes a second fan (4) located on the side of the telescopic chute (100). The second fan (4) is electrically connected to the PLC controller. The PLC controller can control the second fan (4) to start the dust removal fan at the discharge port before the unloading hopper (1) is fully loaded and the discharge gate is opened, so as to capture a small amount of dust escaping from the telescopic chute (100). When the discharge gate is closed, the PLC controller controls the second fan (4) to stop automatically.

7. The negative pressure dust removal unloading hopper according to claim 2, characterized in that: It also includes a dust removal assembly, which includes an air storage tank (23), a dust removal pulse meter, and multiple nozzles (232) located inside the upper housing (21). The bottom end of one nozzle (232) is coaxially aligned with a filter bag (242). The top end of the nozzle (232) is connected to the air storage tank (23) through an electromagnetic pulse valve (231). Both the electromagnetic pulse valve (231) and the dust removal pulse meter are connected to a controller. The dust removal pulse meter is used to control the blowing action of the electromagnetic pulse valve in coordination with the operating status of the dust removal fan.

8. The negative pressure dust removal unloading hopper according to claim 1, characterized in that: It also includes a support frame (3), the unloading hopper (1) is mounted on the support frame (3), the bottom of the support frame (3) is provided with a traction walking component, the traction walking component includes a traction frame (5), the bottom of the traction frame (5) is equipped with a walking wheel (51), and the support frame (3) is also equipped with a climbing platform (7) and an operating room (8).

9. The negative pressure dust removal unloading hopper according to claim 2, characterized in that: A differential pressure sensor is installed between the upper housing (21) and the middle housing (22), and the differential pressure sensor is electrically connected to the PLC controller.

10. The negative pressure dust removal unloading hopper according to claim 2, characterized in that: A vibration motor is installed on the unloading hopper (1) and / or ash hopper, and the vibration motor is connected to a PLC controller.

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