Negative-pressure dust cleaning system for coal conveying belt corridor

Abstract

The utility model relates to a coal conveyor belt corridor negative pressure dust cleaning system which comprises a dust collection assembly and a cleaning system connected with the dust collection assembly, the dust collection assembly is composed of a dust collection main pipeline and dust collection pipes, the dust collection pipes are installed on the sides of the dust collection main pipeline respectively, one end of the dust collection main pipeline is sealed, and the other end of the dust collection main pipeline is connected with the cleaning system. The cleaning system is composed of a primary cyclone separator, a secondary cloth bag separator and a high negative pressure fan set, one end of the primary cyclone separator is connected with the dust collection main pipeline, the other end of the primary cyclone separator is connected with the secondary cloth bag separator through a first connecting pipeline, the secondary cloth bag separator is connected with the high negative pressure fan set through a second connecting pipeline with an emptying valve, and the high negative pressure fan set is connected with the dust collection main pipeline. Discharging barrels with rotary discharging valves are mounted at the bottoms of the primary cyclone separator and the secondary cloth bag separator. The utility model has the advantages of simple and reasonable structure, practicability, convenience and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of cleaning device relates to a coal belt gallery negative pressure dust cleaning system can be applied to smelting, steel, chemical industry, thermal power generation, building material, mine, grain and many other fields, can effectively collect and handle all kinds of dust, flying dust and bulk material. BACKGROUND

[0002] The coal belt gallery is a relatively closed and relatively narrow material conveying space, and a large amount of dust is continuously generated when the coal belt conveyor is operated in the space for a long time, and a lot of materials are scattered to the lower part of the belt conveyor and the cable bridge slot, which has great safety hazards; the current manual cleaning, i.e. the existing traditional treatment method, has many problems such as low cleaning efficiency, high difficulty, untimeliness, instability, etc., and cannot avoid the secondary dust hazards generated in the cleaning process; in addition, manual cleaning cannot completely solve the fundamental problems of dust cleaning and material scattering recovery in the belt gallery, which not only increases the production and management cost of enterprises, but also easily causes personnel casualties, production accidents, safety and environmental protection and many other high-risk hidden problems.

[0003] Therefore, a coal belt gallery negative pressure dust cleaning system is designed to overcome the above problems. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at overcoming the deficiencies in the prior art and provides a coal belt gallery negative pressure dust cleaning system which is simple and reasonable in structure, practical, safe and reliable, good in sealing, good in cleaning effect and environmentally friendly and efficient.

[0005] The utility model is implemented through the following technical scheme: a coal belt gallery negative pressure dust cleaning system, which comprises a dust suction assembly and a cleaning system connected with the dust suction assembly, the dust suction assembly is composed of a dust suction main pipeline and at least one dust suction pipe, each dust suction pipe is installed on the side of the dust suction main pipeline, one end of the dust suction main pipeline is sealed, and the other end is connected with the cleaning system, the cleaning system is composed of a primary cyclone separator, a secondary bag separator and a high-pressure fan set, one end of the primary cyclone separator is connected with the dust suction main pipeline, the other end is connected with the middle part of the secondary bag separator through a first connecting pipeline at a position close to the top, the position close to the top of the secondary bag separator is connected with the high-pressure fan set through a second connecting pipeline provided with an emptying valve, a discharge barrel provided with a rotary discharge valve is installed at the bottom of the primary cyclone separator and the secondary bag separator, the negative pressure suction force provided by the high-pressure fan set is used to ensure that each dust suction pipe sucks the dust scattered on the ground, dust-containing air flows pass through the primary cyclone separator and the secondary bag separator in sequence for air-dust separation and filtration, the collected dust falls into the discharge barrel through the rotary discharge valve, and the clean gas is discharged through the emptying valve on the second connecting pipeline.

[0006] Preferably: the first-stage cyclone separator consists of an upper rectangular cylinder and a lower cone, the rectangular cylinder and the cone are connected to each other up and down and internally communicated, and an air inlet and an air outlet are respectively provided on both sides of the side of the cylinder, the air inlet is connected to the main dust suction pipe, and the air outlet is connected to the first connecting pipe, and a first dust discharge port is provided at the bottom of the cone, and a discharge bucket with a rotary discharge valve is installed at the first dust discharge port. The dust-laden airflow entering from the dust suction pipe rotates in the first-stage cyclone separator, and the dust particles in the dust-laden airflow move toward the outer wall under the action of centrifugal force, reach the wall surface and fall into the first dust discharge port at the bottom along the wall under the action of airflow and gravity, and are collected in the discharge bucket, thereby achieving the purpose of separation. The dust-laden airflow after being processed by the first-stage cyclone separator enters the second-stage bag separator for secondary processing.

[0007] Preferably: the secondary bag separator consists of a shell and a filter bag and a blow pipe arranged in the shell. The upper part of the shell is a rectangular structure, and the bottom of the shell is a cone bucket. A gas inlet is provided at the side of the cone bucket near the bottom, and the gas inlet is connected to the first connecting pipe. A second dust outlet is provided at the bottom of the cone bucket, and a discharge barrel with a rotary discharge valve is also installed at the second dust outlet. A gas outlet is provided at the side of the rectangular structure near the top, and the gas outlet is connected to the second connecting pipe. A vertically arranged first partition and a horizontally arranged second partition are respectively provided near the gas inlet and near the gas outlet in the shell, wherein a bottom of the first partition is provided between the cone bucket and the cone bucket. There is a spacing for dust-laden air flow to pass through. The second partition divides the rectangular structure into two upper and lower chambers. The upper chamber is a clean air chamber, and the lower chamber is a processing chamber. At least one through hole is provided on the second partition. Each through hole is located in the processing chamber and a vertically arranged filter bag is installed. The top of the filter bag is connected to the blow pipe that passes through the through hole of the second partition. A pulse valve is installed at the end of the blow pipe. The dust-laden air flow treated by the first-stage cyclone separator is guided by the first partition and flows upward from the bottom. After being filtered by the filter bags in turn, the clean gas is discharged through the exhaust valve on the second connecting pipe. The dust particles in the dust-laden air flow fall into the second dust exhaust port at the bottom under the action of centrifugal force and are collected in the discharge bucket.

[0008] Preferably, a pressure gauge and a pressure transmitter are installed on the dust collection main pipe, the first connecting pipe and the second connecting pipe.

[0009] Preferably, an explosion-proof valve is provided at the connection between the main dust collection pipeline and the first-stage cyclone separator.

[0010] Preferably, the model of the main dust collection pipe is DN100, the models of the first connecting pipe and the second connecting pipe are both DN150, and the model of the dust collection pipe is DN80 or DN50.

[0011] As preferred: the sealed end of the dust collection main pipeline is provided with a cleaning valve for regularly cleaning the pipeline.

[0012] As preferred: the dust collection main pipeline and the dust collection pipe are connected through an elbow tee with a curvature radius of 2.5D, for avoiding pressure loss and pipeline blockage.

[0013] As preferred: the high negative pressure fan group is composed of a box body and a high negative pressure fan arranged in the box body, the output end of the high negative pressure fan is connected with the second connecting pipeline, and a through hole with an axial flow fan is arranged on the top surface of the box body, for ensuring normal operation of the high negative pressure fan.

[0014] As preferred: the high negative pressure fan has a delivery operation negative pressure wind pressure of ≥-50kPa and a wind volume of ≥2000m³ / h, and the high negative pressure fan, the primary cyclone separator and the secondary bag separator can be controlled through a PLC controller.

[0015] The beneficial effects of the utility model are as follows:

[0016] The cleaning system designed by the utility model solves various dust cleaning, material collecting, air cleaning and other comprehensive management needs in each belt gallery area through efficient hierarchical processing of the primary cyclone separator and the secondary bag separator. The utility model can provide online cleaning for 2-3 persons at the same time (a corresponding number of dust collection pipes can be provided according to personnel allocation), and real-time material recovery; not only can reduce the labor intensity of cleaning personnel, improve cleaning efficiency and quality, eliminate secondary dust hazards, reduce production safety accidents and the like, but also can help enterprises reduce costs, improve efficiency, strengthen safety and other advantages, and provide strong and effective solutions for safe production and efficient operation of enterprises. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a whole structure schematic view of the utility model.

[0018] Figure 2 It is a structure schematic view of the primary cyclone separator in the utility model.

[0019] Figure 3 It is a structure schematic view of the secondary bag separator in the utility model (filtering state).

[0020] Figure 4 It is a structure schematic view of the secondary bag separator in the utility model (cleaning state). DETAILED DESCRIPTION

[0021] In order to make those skilled in the art more clearly understand the purpose, technical scheme and advantages of the utility model, the utility model is further described below in combination with the drawings and embodiments.

[0022] In the description of the utility model, it needs to understand that the orientation or position relation indicated by the terms such as "upper", "lower", "left", "right", "inner", "outer", "horizontal", "vertical" is based on the orientation or position relation shown in the drawing, and is only for the convenience of describing the utility model, and does not indicate or imply that the device or element indicated must have a particular orientation, so it can not be understood as the limitation of the utility model.

[0023] The utility model will be described in detail in combination with the drawings: as Figure 1 The utility model discloses a kind of coal belt gallery negative pressure dust cleaning systems, including dust suction component and the cleaning system 3 being connected with dust suction component, the dust suction component is composed of dust suction main pipeline 1 and at least one dust suction pipe 2, each dust suction pipe 2 is respectively installed on the side of dust suction main pipeline 1, the dust suction main pipeline 1 is sealed in one end, the other end is connected with cleaning system, the cleaning system 3 is composed of primary cyclone 4, secondary cloth bag separator 5 and high negative pressure fan set 6, wherein the primary cyclone 4 is connected with dust suction main pipeline 1 in one end, the other end is connected with the middle position of secondary cloth bag separator 5 by first connecting pipeline 7 in position close to top, and its secondary cloth bag separator 5 is connected with high negative pressure fan set 6 by second connecting pipeline 9 with emptying valve 8 in position close to top, and dust hopper 11 with rotary discharge valve 10 is installed in the bottom of primary cyclone 4 and secondary cloth bag separator 5, and the dust suction of ground scattered leakage of each dust suction pipe 2 is carried out by the negative pressure suction force provided by high negative pressure fan set 6, to guarantee, dust containing airflow is sequentially filtered by primary cyclone 4, secondary cloth bag separator 5 and carries out gas dust separation, and the dust collected falls into dust hopper 11 by rotary discharge valve 10, and clean gas is discharged by emptying valve 8 on second connecting pipeline 9. Various shapes handheld dust suction tools (duck flat mouth, brush) can be matched on the dust suction pipe, to facilitate effectively capturing and cleaning dust in different positions.

[0024] As Figure 2As shown, the primary cyclone separator 4 is composed of an upper rectangular cylinder 12 and a lower cone 13, which are connected and communicated internally, and an air inlet 14 and an air outlet 15 are arranged on the sides of the cylinder, the air inlet 14 is connected with the dust suction main pipeline 1, and the air outlet 15 is connected with the first connecting pipeline 7, a first dust discharge port 16 is arranged at the bottom of the cone 13, and a discharge bucket 11 with a rotary discharge valve 10 is arranged at the first dust discharge port 16, the dust-containing airflow entering from the dust suction pipeline 2 rotates in the primary cyclone separator 4, the dust particles in the dust-containing airflow move to the outer wall under the action of centrifugal force, reach the wall surface, and fall along the wall to the bottom of the first dust discharge port 16 under the action of airflow and gravity, and are collected in the discharge bucket 11, so as to achieve the purpose of separation, and the dust-containing airflow treated by the primary cyclone separator 4 enters the secondary bag separator 5 for secondary treatment.

[0025] As shown in the figure, Figures 3-4 The secondary bag separator 5 is composed of a shell 17, filter bags 18 arranged in the shell 17, and a blowing pipe 19, the upper part of the shell 17 is a rectangular structure 20, and the lower part is a conical hopper 21, an air inlet 22 is arranged at the side of the conical hopper 21 close to the bottom, the air inlet 22 is connected with the first connecting pipeline 7, a second dust discharge port 23 is arranged at the bottom of the conical hopper 21, and a discharge bucket 11 with a rotary discharge valve 10 is arranged at the second dust discharge port 23, the side of the rectangular structure 20 close to the top is provided with an air outlet 24, the air outlet 24 is connected with the second connecting pipeline 9, the shell 17 is provided with a first partition plate 25 arranged vertically and a second partition plate 26 arranged horizontally at positions close to the air inlet 22 and the air outlet 24, respectively, a spacing 27 is arranged between the bottom of the first partition plate 25 and the conical hopper 21 for the dust-containing airflow to pass through, and the second partition plate 26 divides the rectangular structure 20 into an upper chamber and a lower chamber, the upper chamber is a clean gas chamber 28, and the lower chamber is a treatment chamber 29, at least one through hole is arranged on the second partition plate 26, a filter bag 18 arranged vertically is arranged at each through hole in the treatment chamber, the top of the filter bag 18 is connected with the blowing pipe 19 penetrating the through hole of the second partition plate 26, and a pulse valve 30 is arranged at the end of the blowing pipe 19, the dust-containing airflow treated by the primary cyclone separator 4 flows upward from the bottom after being guided by the first partition plate 25, is filtered by the filter bags in turn, and the clean gas is discharged through the emptying valve on the second connecting pipeline 9, and the dust particles in the dust-containing airflow fall into the second dust discharge port 23 at the bottom in the discharge bucket 11 under the action of centrifugal force and are collected.

[0026] The first partition plate arranged at the air inlet of the secondary bag separator shell can be provided with a device for reducing the erosion and wear of the filter bags by airflow and prolonging the service life. Of course, other types of air inlet flow guide devices with similar functions to the partition plate can also be provided.

[0027] A pressure gauge 31 and a pressure transmitter 32 are installed on the main dust collection pipe 1, the first connecting pipe 7, and the second connecting pipe 9. An explosion-proof valve 37 is provided at the connection between the main dust collection pipe 1 and the first-stage cyclone separator 4. The model of the main dust collection pipe 1 is DN100, the models of the first connecting pipe 7 and the second connecting pipe 9 are both DN150, and the model of the dust collection pipe 2 is DN80 or DN50. A cleaning valve 33 is installed at the sealed end of the main dust collection pipe 1 for regular cleaning of the pipeline. The main dust collection pipe 1 and the dust collection pipe 2 are connected by an elbow tee 34, and the elbow tee 34 adopts a curvature radius of 2.5D to avoid pressure loss and pipeline blockage.

[0028] The high-negative-pressure fan unit 6 comprises a housing 35 and a high-negative-pressure fan 36 disposed within the housing 35. The output end of the high-negative-pressure fan 36 is connected to the second connecting pipe 9. A through hole with an axial flow fan 38 is provided on the top surface of the housing 35 to ensure the normal operation of the high-negative-pressure fan 36. The high-negative-pressure fan 36 operates at a negative pressure of ≥ -50 kPa and an air volume of ≥ 2000 m³ / h. The high-negative-pressure fan 36, as well as the primary cyclone separator 4 and the secondary bag separator 5, can all be controlled by a PLC controller. The PLC controller can also be equipped with an on-site control cabinet with an LCD touch screen, allowing for both manual and automatic operation.

[0029] The working characteristics of this utility model are as follows:

[0030] First-stage cyclone separator

[0031] like Figure 2 As shown in the figure, the first-stage cyclone separator is when the dust-laden airflow enters the interior from the tangential inlet, the airflow rotates inside, and the dust particles in the airflow move toward the outer wall under the action of centrifugal force, reach the wall surface, and fall into the ash hopper along the wall under the action of airflow and gravity to achieve the purpose of separation.

[0032] The vast majority of the swirling airflow flows from the cylinder along the wall, spiraling downward from the top to the bottom of the cone, forming a descending, outward-swirl of dust-laden airflow. The centrifugal force generated by the intense rotation flings dust particles, much denser than the gas, toward the wall. Once in contact with the wall, the dust particles lose their inertial force and, driven by momentum from their inlet velocity and their own gravity, fall along the wall into the dust hopper. Upon reaching the bottom of the cone, the swirling, downward airflow turns upward along the axis of the dust collector, forming an ascending, inward-swirl of airflow, which is discharged through the dust collector's exhaust pipe.

[0033] Another small part of the airflow flowing in from the air inlet flows toward the top cover of the cyclone dust collector, and then flows downward along the outside of the exhaust pipe. When it reaches the lower end of the exhaust pipe, it reverses upward and is discharged from the exhaust pipe together with the rising central airflow, and the dust particles dispersed in it are also taken away.

[0034] Secondary cloth bag separator

[0035] As Figure 3 shown, in operation, dust-containing gas enters from the air inlet, coarse dust particles directly fall into the ash hopper bottom, fine dust particles turn upward with the airflow, dust accumulates on the outer surface of the filter bag, filtered gas enters the clean gas chamber and is discharged to the atmosphere through the exhaust valve. The dust cleaning process is to open the pulse valve and use compressed air for pulse blowing, and the closing time of the cut-off valve is sufficient to ensure that the dust separated from the filter bag settles in the ash hopper after blowing, avoiding the phenomenon that the dust is attached to the surface of the adjacent filter bag after separating from the surface of the filter bag, so that the filter bag is thoroughly cleaned, and the exhaust valve, pulse valve and dust discharge valve are automatically controlled by the programmable control instrument.

[0036] The utility model discloses adopt PLC control, through pipeline pressure real -time monitoring, configuration differential alarm, overload alarm and so on, guarantee system operation stable and reliable.

[0037] The cleaning system designed by the utility model solves various dust cleaning, material collecting, air cleaning and other comprehensive management needs in each belt gallery area in one station through the efficient grading treatment of the primary cyclone separator and the secondary cloth bag separator. The utility model can provide online cleaning for 2-3 persons at the same time (a corresponding number of dust collection pipes can be provided according to personnel allocation), and material is recycled in real time. The utility model not only can reduce the labor intensity of cleaning personnel, improve cleaning efficiency and quality, eliminate secondary dust hazards and reduce production safety accidents, but also can help enterprises reduce costs, improve efficiency, strengthen safety and have many other advantages, thereby providing strong and effective solutions for safe production and efficient operation of enterprises.

[0038] The utility model discloses high negative pressure, strong suction: adopt high negative pressure fan as power source, suction is big, and the structure is simple, and the noise is low, and the moving part in pump does not contact each other, is not easy to damage, and the maintenance cost is low and so on.

[0039] The utility model discloses dust collection sealing is complete: this system sets up two -stage dust collection device and can completely satisfy the latest national environmental protection emission standard after filtration, reaches dust collection complete clean discharge, and the dust collection goal of preventing secondary pollution. The sealing connection between each equipment in high negative pressure dust collection device, the automatic dust discharge of each dust collection device storage hopper, no dust leakage end and external overflow point in the system, from the source, prevent the secondary pollution phenomenon from happening. The utility model control is flexible: the negative pressure dust collection device adopts PLC control mode, can manually control, and the system operation is flexible and reliable, and the operation mode is simple, and the operability is strong, and simultaneously, system parameters can be freely set, record, store and the like. The utility model market prospect: its simple structure, safe and reliable, has good market prospect.

[0040] The specific embodiments described herein are merely illustrative of the principles of the present application and its efficacy, and are not intended to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical concept disclosed by the present application shall be covered by the claims of the present application.

Claims

1. A negative pressure dust cleaning system for a coal conveyor belt corridor, comprising a dust collection component and a cleaning system (3) connected to the dust collection component, characterized in that: The dust collection assembly is composed of a dust collection main pipe (1) and at least one dust collection pipe (2), each dust collection pipe (2) is respectively installed on the side of the dust collection main pipe (1), one end of the dust collection main pipe (1) is sealed, and the other end is connected to the cleaning system, and the cleaning system (3) is composed of a primary cyclone separator (4), a secondary bag separator (5) and a high negative pressure fan unit (6), wherein one end of the primary cyclone separator (4) is connected to the dust collection main pipe (1), and the other end near the top is connected to the middle position of the secondary bag separator (5) through a first connecting pipe (7), and the secondary bag separator (5) near the top is connected to the middle position of the secondary bag separator (5) through a high negative pressure fan unit (6). The second connecting pipe (9) of the emptying valve (8) is connected to the high negative pressure fan unit (6), and a discharge bucket (11) with a rotary discharge valve (10) is installed at the bottom of the first-level cyclone separator (4) and the second-level bag separator (5). The negative pressure suction force provided by the high negative pressure fan unit (6) is used to ensure that each dust suction pipe (2) sucks the dust scattered and leaked on the ground. The dust-laden air flow passes through the first-level cyclone separator (4) and the second-level bag separator (5) in turn for gas-ash separation and filtration. The collected dust falls into the discharge bucket (11) through the rotary discharge valve (10), and the clean gas is discharged through the emptying valve (8) on the second connecting pipe (9).

2. The negative pressure dust cleaning system for the coal conveyor corridor according to claim 1 is characterized in that: The first-stage cyclone separator (4) is composed of an upper rectangular cylinder (12) and a lower cone (13). The rectangular cylinder (12) and the cone (13) are connected to each other from top to bottom and are internally communicated. An air inlet (14) and an air outlet (15) are respectively provided on both sides of the cylinder. The air inlet (14) is connected to the dust collection main pipe (1), and the air outlet (15) is connected to the first connecting pipe (7). A first dust discharge port (16) is provided at the bottom of the cone (13). The first dust discharge port (16) A discharge bucket (11) with a rotary discharge valve (10) is installed at the discharge bucket (11). The dust-laden airflow entering from the dust suction pipe (2) rotates in the first-stage cyclone separator (4). The dust particles in the dust-laden airflow move toward the outer wall under the action of centrifugal force, reach the wall surface, and fall along the wall into the first dust discharge port (16) at the bottom under the action of airflow and gravity. They are collected in the discharge bucket (11), thereby achieving the purpose of separation. The dust-laden airflow treated by the first-stage cyclone separator (4) enters the second-stage bag separator (5) for secondary treatment.

3. The negative pressure dust cleaning system for the coal conveyor corridor according to claim 2 is characterized in that: The secondary bag separator (5) is composed of a shell (17), a filter bag (18) and a blowpipe (19) arranged in the shell (17). The upper part of the shell (17) is a rectangular structure (20), and the lower part is a cone bucket (21). A gas inlet (22) is provided at the side of the cone bucket (21) near the bottom, and the gas inlet (22) is connected to the first connecting pipe (7). A second dust outlet (23) is provided at the bottom of the cone bucket (21), and a discharge barrel (11) with a rotary discharge valve (10) is also installed at the second dust outlet (23). A gas outlet (24) is provided at the side of the rectangular structure (20) near the top, and the gas outlet (24) is connected to the second connecting pipe (9). A vertically arranged first partition (25) and a horizontally arranged second partition (26) are provided in the shell (17) near the gas inlet (22) and near the gas outlet (24), respectively, wherein the first A gap (27) is provided between the bottom of the partition (25) and the cone bucket (21) for the dust-laden air flow to pass through. The second partition (26) divides the rectangular structure (20) into two upper and lower chambers, the upper chamber being a clean air chamber (28) and the lower chamber being a processing chamber (29). At least one through hole is provided on the second partition (26). A vertically arranged filter bag (18) is installed at each through hole in the processing chamber. The top of the filter bag (18) is connected to a blow pipe (19) passing through the through hole of the second partition (26). A pulse valve (30) is installed at the end of the blow pipe (19). The dust-laden air flow treated by the primary cyclone separator (4) is guided by the first partition (25) and flows upward from the bottom. After being filtered by the filter bags in turn, the clean gas is discharged through the exhaust valve on the second connecting pipe (9). The dust particles in the dust-laden air flow fall into the second dust discharge port (23) at the bottom under the action of centrifugal force and are collected in the discharge bucket (11).

4. The negative pressure dust cleaning system for the coal conveyor corridor according to claim 2 or 3, characterized in that: A pressure gauge (31) and a pressure transmitter (32) are installed on the dust collection main pipe (1), the first connecting pipe (7), and the second connecting pipe (9).

5. The negative pressure dust cleaning system for the coal conveyor corridor according to claim 4 is characterized in that: An explosion-proof valve (37) is provided at the connection between the dust collection main pipeline (1) and the first-stage cyclone separator (4).

6. The negative pressure dust cleaning system for the coal conveyor corridor according to claim 5 is characterized in that: The model of the dust collection main pipe (1) is DN100, the models of the first connecting pipe (7) and the second connecting pipe (9) are both DN150, and the model of the dust collection pipe (2) is DN80 or DN50.

7. The negative pressure dust cleaning system for the coal conveyor corridor according to claim 6 is characterized in that: A cleaning valve (33) is installed at the sealed end of the dust collection main pipeline (1) for regularly cleaning the pipeline.

8. The negative pressure dust cleaning system for the coal conveyor corridor according to claim 7 is characterized in that: The dust collection main pipeline (1) and the dust collection pipe (2) are connected via an elbow tee (34).

9. The negative pressure dust cleaning system for the coal conveyor corridor according to claim 1 or 8, characterized in that: The high negative pressure fan unit (6) is composed of a box body (35) and a high negative pressure fan (36) arranged in the box body (35), the output end of the high negative pressure fan (36) is connected to the second connecting pipe (9), and a through hole with an axial flow fan (38) is provided on the top surface of the box body (35) to ensure the normal operation of the high negative pressure fan (36).

10. The negative pressure dust cleaning system for the coal conveyor corridor according to claim 9, characterized in that: The high negative pressure fan (36) conveys a negative pressure wind pressure of ≥-50 kPa and an air volume of ≥2000 m³ / h. The high negative pressure fan (36) and the first-stage cyclone separator (4) and the second-stage bag separator (5) can all be controlled by a PLC controller.

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