CN110439867B

CN110439867B - Cloth bag dust collection fan and starting method thereof

Info

Publication number: CN110439867B
Application number: CN201910681196.8A
Authority: CN
Inventors: 孙方成; 张勇; 李光明
Original assignee: Pingyi Beixin Building Material Co ltd; Beijing New Building Material Group Co Ltd
Current assignee: Pingyi Beixin Building Material Co ltd; Beijing New Building Material Group Co Ltd
Priority date: 2019-07-26
Filing date: 2019-07-26
Publication date: 2020-09-15
Anticipated expiration: 2039-07-26
Also published as: CN110439867A

Abstract

The embodiment of the invention discloses a cloth bag dust collection fan and a starting method thereof, the cloth bag dust collection fan comprises a dust collection host, a fan, a dust collection assembly and a valve assembly arranged in the dust collection host, the fan is arranged at one side of the dust collection host, an air inlet and an air outlet of the fan are respectively connected with a first air pipe and a second air pipe, the fan is connected with the valve assembly through the first air pipe, the dust collection assembly is arranged below the valve assembly, the valve assembly comprises an air box and an air pressure sensor arranged in the air box, a plurality of pneumatic push rods are arranged in the air box, when the cloth bag dust collection fan is used, the pneumatic push rods can be gradually opened according to the rotating speed of the fan, the dust collection efficiency can be gradually increased under the condition that the motor is not overloaded, the maximum rotating speed of the fan under the no-load condition can be avoided, and then the air pipes and branch boxes can be, the problems that the machine is slow to start and damages the air pipe and the air box greatly when the machine is started can be effectively solved.

Description

Cloth bag dust collection fan and starting method thereof

Technical Field

The embodiment of the invention relates to the technical field of bag dust collecting fans, in particular to a bag dust collecting fan and a starting method thereof.

Background

Along with the enhancement of environmental awareness of people, energy conservation, emission reduction and environment purification become the top of enterprises, a cloth bag dust collector is adopted at most of cement mills, raw meal mills, coal mills, dryers, kiln tails and other parts, higher dust removal efficiency is achieved, and compared with an electrostatic dust collector, the cloth bag dust collector is safer and more reliable, and people pay more attention to the cloth bag dust collector.

Present sack dust collector is when carrying out the use, all need close just can start the fan with the flashboard earlier, and need wait just can carry out the work of gathering dust after the fan rotational speed is stable, it is very slow to start, and still can be because the wind pressure problem when starting, cause very big damage to flashboard and tuber pipe, in order to improve the boot speed at the staff, and select not close when the flashboard just starts the fan, will cause the overload of fan motor very easily, it solves to wait for us.

Disclosure of Invention

Therefore, the embodiment of the invention provides a cloth bag dust collecting fan and a starting method thereof, wherein the rotating speed of the fan is detected by a rotating speed sensor, classification can be carried out according to the rotating speed of the fan, and then the corresponding pneumatic push rod can be started by the rotating speed of the fan at different stages, so that the problems that the cloth bag dust collector in the prior art is slow to start, the damage to an air pipe and a flashboard is large, and the fan is started under the condition that the flashboard is not closed, so that the motor of the fan is overloaded are solved.

In order to achieve the above object, an embodiment of the present invention provides the following:

a cloth bag dust collection fan comprises a dust collection host, a fan, a dust collection assembly and a valve assembly arranged in the dust collection host, wherein the fan is arranged on one side of the dust collection host, an air inlet and an air outlet of the fan are respectively connected with a first air pipe and a second air pipe, the fan is connected with the valve assembly through the first air pipe, and the dust collection assembly is arranged below the valve assembly;

the valve component comprises an air box and an air pressure sensor arranged in the air box, a plurality of pneumatic push rods are arranged in the air box, and through holes corresponding to the pneumatic push rods are formed in the bottom of the air box;

the dust removal assembly comprises a mounting frame, a filter bag and a cleaning assembly, the mounting frame is fixedly mounted at a position corresponding to a through hole, fixing assemblies are arranged at the upper end and the lower end of the mounting frame, rubber clamping blocks corresponding to the fixing assemblies are arranged on the filter bag, each fixing assembly comprises an annular caulking groove, an adjusting ring and a fixing ring connected to the adjusting ring in a sliding mode, the adjusting ring is screwed in the annular caulking groove through threads, a plurality of fixing blocks arranged at equal intervals are arranged on the fixing rings, fixing grooves corresponding to the fixing blocks are formed in the rubber clamping blocks, and the filter bag is mounted on the mounting frame through the embedding of the fixing grooves and the fixing blocks;

the cleaning assembly comprises a rotating disc which is rotatably connected below the mounting rack, a plurality of cleaning blades are arranged above the rotating disc in an annular array mode about the central axis of the rotating disc, a brush is arranged on one side, close to the mounting rack, of each cleaning blade, and rotating blades are further arranged below the rotating disc.

As a preferred scheme of the invention, the wind power generator further comprises a pressure relief wind pipe connected with the first wind pipe, a pressure relief assembly is arranged inside the pressure relief wind pipe, the pressure relief assembly comprises a fixed plate and a rotating plate rotatably connected to the fixed plate through a rotating shaft, a plurality of square mounting rods are arranged on the rotating plate in an annular array around the axis of the transverse center line of the rotating plate, fan-shaped baffles are arranged on the square mounting rods, fan-shaped through grooves corresponding to the fan-shaped baffles are formed in the fixed plate, and springs arranged between the fan-shaped baffles and the rotating plate are sleeved on the square mounting rods.

As a preferred scheme of the invention, a torsion spring is sleeved on the rotating shaft.

As a preferable scheme of the present invention, a plurality of first limiting blocks are disposed on one side of the fixed plate close to the rotating plate, and a second limiting block corresponding to the first limiting block is disposed on the rotating plate.

As a preferable scheme of the present invention, a rotating disc is arranged on the pressure relief air pipe, a bevel gear is arranged below the rotating disc through a connecting rod, a bevel gear capable of meshing with the bevel gear is arranged on the rotating plate, and the rotating disc is connected with the rotating plate through meshing of the bevel gear and the bevel gear.

As a preferable scheme of the present invention, at least three support rods are arranged at the outlet end of the second air duct, and a tapered cover plate is fixedly mounted above the support rods.

As a preferable scheme of the present invention, a third air duct disposed corresponding to the rotating blade is further disposed inside the dust removing host, an inlet end of the third air duct is connected to the tapered cover plate, and the third air duct is further provided with an electromagnetic valve.

As a preferable scheme of the present invention, the fan is further provided with a rotation speed sensor.

As a preferred scheme of the invention, the starting method of the cloth bag dust collecting fan comprises the following steps:

the method comprises the following steps of firstly, respectively obtaining linear data of the rotating speed of a fan after the fan is started and the pressure inside an air box at the rotating speed of the fan through a rotating speed sensor and an air pressure sensor;

dividing the linear data of the rotating speed of the fan into a plurality of grades, and starting a corresponding pneumatic push rod after the rotating speed of the fan reaches the corresponding grade;

and step three, comparing the pressure change of the air box after the pneumatic push rod is opened with a standard pressure value, judging whether the dust removal assembly is blocked or not, and normally starting according to the step two if the dust removal assembly is not blocked.

According to a preferable scheme of the invention, after the dust removal assembly is judged to be blocked according to the third step, the electromagnetic valve is started, part of air is introduced into a third air pipe arranged above the second air pipe, the cleaning assembly starts to clean dust until the internal pressure of the air box is restored to a standard value, and then the fan can be normally started according to the second step.

The embodiment of the invention has the following advantages:

(1) when the dust collection device is used, the pneumatic push rod can be gradually opened according to the rotating speed of the fan, the dust collection efficiency can be gradually increased under the condition that the motor is not overloaded, the situation that the fan reaches the maximum rotating speed under the no-load condition and then the air pipe and the air box are greatly damaged due to the pressure problem when dust is removed can be avoided, and the problems that the machine is slow to start and the air pipe and the air box are greatly damaged when the machine is started can be effectively solved.

(2) When the fan is started, whether the dust removal assembly is blocked can be judged according to the change of the numerical value of the air pressure sensor, part of air can be introduced into the dust removal host machine through the third air pipe, and then the cleaning assembly can be driven by the introduced air to remove dust, so that more blockages can be avoided, and the load of the fan during operation can be increased.

(3) The pressure relief assembly provided by the invention can avoid accidental damage to the valve assembly and the first air pipe caused by sudden increase of the pressure in the air pipe in case of an accident, and is more practical.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic view of a portion of a dust removal assembly according to an embodiment of the present invention;

FIG. 3 is a top view of a sweeping assembly in an embodiment of the present invention;

FIG. 4 is a schematic diagram of a pressure relief assembly according to an embodiment of the present invention;

FIG. 5 is a schematic view showing the structure of a rotation plate according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a fixing plate according to an embodiment of the present invention;

FIG. 7 is a flow chart of an embodiment of the present invention

FIG. 8 is an enlarged view of a portion of the structure at B in FIG. 1;

fig. 9 is an enlarged view of a portion B of fig. 2.

In the figure:

1-a dust removal host; 2-a fan; 3-a dust removal assembly; 4-a valve assembly; 5-a first air duct; 6-a second air duct; 7-a pressure relief air pipe; 8-a pressure relief assembly; 9-a support bar; 10-a conical cover plate; 11-a rotational speed sensor;

301-a mounting frame; 302-a filter bag; 303-a sweeping assembly; 304-a stationary component; 305-a rubber fixture block; 306-annular caulking groove; 307-adjusting ring; 308-a fixed ring; 309-fixed block; 310-fixed slots; 311-a rotating disk; 312-sweeping the blade; 313-a brush; 314-rotating blades; 315-connecting rod; 316-bevel gear; 317-bevel gear; 318-third air duct; 319-solenoid valve;

401-wind box; 402-a barometric pressure sensor; 403-pneumatic push rod; 404-a via hole;

801-fixing plate; 802-a rotating shaft; 803-rotating plate; 804-square mounting bar; 805-sector shaped baffles; 806-sector through slots; 807-a spring; 808-torsion spring; 809-a first limiting block; 810-second stop block.

Detailed Description

The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 9, the invention provides a cloth bag dust collection fan and a starting method thereof, the cloth bag dust collection fan comprises a dust collection main machine 1, a fan 2, a dust collection component 3 and a valve component 4 arranged in the dust collection main machine 1, the fan 2 is arranged at one side of the dust collection main machine 1, an air inlet and an air outlet of the fan 2 are respectively connected with a first air pipe 5 and a second air pipe 6, the fan 2 is connected with the valve component 4 through the first air pipe 5, the dust collection component 3 is arranged below the valve component 4, and an ash bucket for collecting dust is arranged at the bottom of the dust collection main machine 1, so that a later user can conveniently perform centralized treatment on the collected dust.

In addition, a rotating speed sensor 11 is further arranged on the fan 2, the rotating speed sensor 11 is a photoelectric rotating speed sensor, a light reflecting patch matched with the photoelectric rotating speed sensor is further attached to a main shaft of the motor, the photoelectric rotating speed sensor is composed of a light emitter and a light receiver which are independently and oppositely arranged, when an El mark passes through the space between the light emitter and the light receiver and blocks light, the sensor outputs a signal, the detection device is the detection device with highest efficiency and the most reliable, a user can obtain accurate rotating speed information conveniently, and then grades are divided according to the rotating speed information of the fan conveniently.

The valve assembly 4 comprises a bellows 401 and an air pressure sensor 402 arranged inside the bellows 401, the bellows 401 is internally provided with a plurality of pneumatic push rods 403, the bottom of the bellows 401 is provided with through holes 404 corresponding to the pneumatic push rods 403, the pneumatic push rods 403 can be independently controlled, the corresponding pneumatic push rods 403 can be conveniently started according to actual conditions, and the corresponding through holes 404 can be sealed when a certain filter bag is damaged, so that the problem that the maintenance needs to be stopped emergently during dust removal work can be avoided, the use is more convenient, the air pressure sensor 402 is used for detecting the change condition of the internal pressure of the bellows 401 after the fan 2 is laterally started in real time, a user can conveniently adjust the valve assembly 4 correspondingly according to the rotating speed information of the fan 2 and the pressure information of the bellows 401, and the user can conveniently start the machine at a starting speed, A balance point is found between the pressure of the air box 401 and the load of the fan 2, so that the situation that the starting is too quick can be avoided, unnecessary damage can be caused to the air box 401 and the fan 2, and the air box is more practical.

The dust removal component 3 comprises a mounting frame 301, a filter bag 302 and a cleaning component 303, the mounting frame 301 is a metal piece with a hollow structure to ensure that the mounting frame 301 has higher structural strength during dust removal, the mounting frame 301 is fixedly mounted at a position corresponding to the through hole 404, the upper end and the lower end of the mounting frame 301 are both provided with fixing components 304, the filter bag 302 is provided with a rubber clamping block 305 corresponding to the fixing components 304, the fixing components 304 comprise an annular caulking groove 306, an adjusting ring 307 and a fixing ring 308 connected to the adjusting ring 307 in a sliding manner, the adjusting ring 307 is also provided with an annular sliding rail, the fixing ring 308 is provided with an annular sliding groove corresponding to the annular sliding rail, the adjusting ring 307 is connected to the fixing ring 308 in a sliding manner through the engagement of the annular sliding rail and the annular sliding groove, the adjusting ring 307 is screwed in the annular caulking groove 306 through threads, and the fixing ring 308, the rubber fixture block 305 is provided with a fixing groove 310 corresponding to the fixing block 309, the filter bag 302 is mounted on the mounting frame 301 through the embedding of the fixing groove 310 and the fixing block 309, when the filter bag 302 is mounted, the rubber fixture block 305 can be directly fixed in the annular embedding groove 306, then the fixing ring 308 can be driven to move by rotating the adjusting ring 307, the filter bag 302 can be fixed through the embedding of the fixing block 309 and the fixing groove 310, the fixing ring 308 is connected to the adjusting ring 307 in a sliding mode, therefore, the fixing ring 308 cannot rotate due to the rotation of the adjusting ring 307, and the filter bag 302 can be more conveniently detached and replaced.

The cleaning assembly 303 comprises a rotating disc 311 rotatably connected below the mounting frame 301, a plurality of cleaning blades 312 are arranged above the rotating disc 311 in an annular array around the central axis of the rotating disc, a brush 313 is arranged on one side of each cleaning blade 312 close to the mounting frame 301, a rotating blade 314 is further arranged below the rotating disc 311, and the cleaning blades 312 have a certain inclination, so that the cleaning blades 312 can be driven to rotate by wind entering the dust removal host 1 in the dust removal process, and therefore, the dust can be automatically cleaned in the dust removal process, excessive dust can be accumulated, and the dust removal efficiency is reduced.

In addition, at least three support rods 9 are arranged at the outlet end of the second air duct 6, a conical cover plate 10 is fixedly mounted above the support rods 9, a third air duct 318 corresponding to the rotating blades 314 is further arranged inside the dust removing host 1, the inlet end of the third air duct 318 is connected with the conical cover plate 10, an electromagnetic valve 319 is further arranged on the third air duct 318, the three support rods 9 can support the conical cover plate 10 more stably, the conical cover plate 10 can prevent external rain water, dust and other impurities from entering the fan 2 from the second air duct 6 when in use, so as to cause damage to the fan 2, when the pressure of the air box 401 is abnormal during starting, the electromagnetic valve 319 can be opened, so that the third air duct 318 guides in the air collected by the conical cover plate 10, and the air entering the third air duct 318 drives the cleaning assembly 303 to move, the problem that pressure suddenly increases due to dust blockage during starting can be effectively solved, and the cleaning is more convenient.

In summary, the starting steps of the machine are as follows:

step one, linear data of the rotating speed of the fan 2 after the fan 2 is started and the internal pressure of the air box 401 under the rotating speed of the fan 2 are respectively obtained through the rotating speed sensor 11 and the air pressure sensor 402.

And step two, dividing the linear data of the rotating speed of the fan 2 into a plurality of grades, and starting the corresponding pneumatic push rod 403 after the rotating speed of the fan 2 reaches the corresponding grade.

And step three, comparing the pressure change of the air box 401 after the pneumatic push rod 403 is started with a standard pressure value, judging whether the dust removal component 3 is blocked or not, and normally starting according to the step two if the dust removal component is not blocked.

According to the third step, after the dust removing assembly 3 is judged to be blocked, the electromagnetic valve 319 is started, part of air is introduced into the third air pipe 318 arranged above the second air pipe 6, so that the cleaning assembly 303 starts cleaning dust until the internal pressure of the air box 401 is restored to the standard value, and then the fan 2 can be normally started according to the second step.

That is, in the actual using process, when the fan 2 is at a low rotation speed, a small amount of pneumatic push rods 403 are opened, while realizing low-power dust removal, the pressure in the air box 401 can be reduced, the pressure in the air box 401 is kept in a bearable range, damage of the air box due to large pressure is avoided, the service lives of the air box 401 and other devices can be further prolonged, the problem that the fan 2 is overloaded due to full-load operation when the fan 2 is started is also avoided, according to the increase of the rotation speed of the fan 2, the pneumatic push rods 403 are gradually opened to increase the dust removal power, a balance point can be found between the overload limit of the fan 2, the bearing pressure of the air box 401 and the starting speed, a series of problems that the machine is slow to start, the full-load operation is overloaded due to forgetting to close the flashboard, and the like can be effectively solved, and the pneumatic push.

The invention also comprises a pressure relief air duct 7 connected with the first air duct 5, the pressure relief air duct 7 is internally provided with a pressure relief assembly 8, the pressure relief assembly 8 comprises a fixed plate 801 and a rotating plate 803 rotatably connected on the fixed plate 801 through a rotating shaft 802, a plurality of square mounting rods 804 are arranged on the rotating plate 803 in an annular array around the axis of the transverse center line of the rotating plate 803, fan-shaped baffles 805 are arranged on the square mounting rods 804, the problem of rotation of the arranged square mounting rods 804 can be avoided when the fan-shaped baffles 805 are mounted, the fixed plate 801 is provided with fan-shaped through grooves 806 corresponding to the fan-shaped baffles 805, the square mounting rods 804 are also sleeved with springs 807 arranged between the fan-shaped baffles 805 and the rotating plate 803, the rotating shaft 802 is sleeved with torsion springs 808, when the device is used for dust removal, if the problem of pipeline blockage occurs, the pressure inside the device can be less than the, under the effect of external pressure, can overcome the power of spring 807, push away fan-shaped baffle 805, fan-shaped baffle 805 breaks away from fan-shaped logical groove 806 after, its rotor plate 803 then can realize rotating under torsional spring 808's effect, and then can make external gas pass through fan-shaped logical groove 806 and get into fan 2, can avoid fan 2 when full speed operation, take place to block up and can cause the problem to the unexpected damage of pipeline, and the practicality is stronger.

In addition, a plurality of first limit blocks 809 are arranged on one side of the fixed plate 801 close to the rotating plate 803, a second limit block 810 corresponding to the first limit blocks 809 is arranged on the rotating plate 803, and the first limit blocks 809 and the second limit blocks 810 are arranged to limit the rotating amplitude of the rotating plate 803 under the action of the torsion spring 808 after the fan-shaped baffle 805 is separated from the fan-shaped through slot 806.

The pressure relief air duct 7 is provided with a rotary disc 311, a bevel gear 316 is arranged below the rotary disc 311 through a connecting rod 315, a bevel gear 317 capable of meshing with the bevel gear 316 is arranged on the rotary plate 803, the rotary disc 311 is connected with the rotary plate 803 through meshing of the bevel gear 316 and the bevel gear 317, when the pressure relief assembly 8 is reset, the rotary disc 311 can be rotated, the rotary plate 803 is driven to move through meshing of the bevel gear 316 and the bevel gear 317, and when the rotary plate 803 moves to the position of the fan-shaped through groove 806, the fan-shaped baffle 805 can be embedded into the fan-shaped through groove 806 under the action force of a spring 807, so that the reset of the pressure relief assembly 8 can be completed.

Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. The cloth bag dust collection fan is characterized by comprising a dust collection host (1), a fan (2), a dust collection assembly (3) and a valve assembly (4) arranged in the dust collection host (1), wherein the fan (2) is arranged on one side of the dust collection host (1), an air inlet and an air outlet of the fan (2) are respectively connected with a first air pipe (5) and a second air pipe (6), the fan (2) is connected with the valve assembly (4) through the first air pipe (5), and the dust collection assembly (3) is arranged below the valve assembly (4);

the valve assembly (4) comprises an air box (401) and an air pressure sensor (402) arranged in the air box (401), a plurality of pneumatic push rods (403) are arranged in the air box (401), and through holes (404) corresponding to the pneumatic push rods (403) are formed in the bottom of the air box (401);

the dust removal component (3) comprises a mounting rack (301), a filter bag (302) and a cleaning component (303), the mounting rack (301) is fixedly arranged at the position corresponding to the through hole (404), the upper end and the lower end of the mounting rack (301) are respectively provided with a fixing component (304), and the filter bag (302) is provided with a rubber fixture block (305) corresponding to the fixing component (304), the fixing component (304) comprises an annular caulking groove (306), an adjusting ring (307) and a fixing ring (308) which is connected to the adjusting ring (307) in a sliding way, the adjusting ring (307) is screwed in the annular caulking groove (306) through threads, and a plurality of fixed blocks (309) which are arranged at equal intervals are arranged on the fixed ring (308), the rubber fixture block (305) is provided with a fixing groove (310) corresponding to the fixing block (309), the filter bag (302) is installed on the installation frame (301) through the embedding of the fixing groove (310) and the fixing block (309);

cleaning subassembly (303) including rotating carousel (311) of connection in mounting bracket (301) below, there are a plurality of cleaning blade (312) in the top of carousel (311) about its central axis annular array cleaning blade (312) one side that is close to mounting bracket (301) is provided with brush (313), the below of carousel (311) still is provided with rotating blade (314).

2. The cloth bag dust collection fan according to claim 1, further comprising a pressure relief air pipe (7) connected to the first air pipe (5), wherein a pressure relief assembly (8) is arranged inside the pressure relief air pipe (7), the pressure relief assembly (8) comprises a fixing plate (801) and a rotating plate (803) rotatably connected to the fixing plate (801) through a rotating shaft (802), a plurality of square mounting rods (804) are arranged on the rotating plate (803) in relation to an annular array of a transverse centerline axis of the rotating plate, fan-shaped baffles (805) are arranged on the square mounting rods (804), fan-shaped through grooves (806) corresponding to the fan-shaped baffles (805) are formed in the fixing plate (801), and springs (807) arranged between the fan-shaped baffles (805) and the rotating plate (803) are further sleeved on the square mounting rods (804).

3. The cloth bag dust collecting fan according to claim 2, wherein a torsion spring (808) is sleeved on the rotating shaft (802).

4. The cloth bag dust collecting fan according to claim 2, wherein a plurality of first limiting blocks (809) are arranged on one side of the fixed plate (801) close to the rotating plate (803), and a second limiting block (810) corresponding to the first limiting blocks (809) is arranged on the rotating plate (803).

5. The cloth bag dust collecting fan according to claim 2, wherein a rotary disc (311) is arranged on the pressure relief air pipe (7), a bevel gear (316) is arranged below the rotary disc (311) through a connecting rod (315), a bevel gear (317) capable of being meshed with the bevel gear (316) is arranged on the rotary plate (803), and the rotary disc (311) is connected with the rotary plate (803) through the meshing of the bevel gear (316) and the bevel gear (317).

6. The cloth bag dust collecting fan according to claim 1, wherein at least three support rods (9) are arranged at the outlet end of the second air pipe (6), and a conical cover plate (10) is fixedly arranged above the support rods (9).

7. The cloth bag dust collecting fan according to claim 1, wherein a third air pipe (318) corresponding to the rotating blade (314) is further arranged inside the dust removing main machine (1), an inlet end of the third air pipe (318) is connected with the tapered cover plate (10), and an electromagnetic valve (319) is further arranged on the third air pipe (318).

8. The cloth bag dust collecting fan according to claim 1, wherein a rotation speed sensor (11) is further arranged on the fan (2).

9. The cloth bag dust collecting fan according to claim 1, wherein the starting method of the cloth bag dust collecting fan comprises the following steps:

the method comprises the steps that firstly, linear data of the rotating speed of a fan (2) after the fan (2) is started and the internal pressure of an air box (401) under the rotating speed of the fan (2) are obtained through a rotating speed sensor (11) and an air pressure sensor (402);

dividing the linear data of the rotating speed of the fan (2) into a plurality of grades, and starting a corresponding pneumatic push rod (403) after the rotating speed of the fan (2) reaches the corresponding grade;

step three, comparing the pressure change of the air box (401) after the pneumatic push rod (403) is started with a standard pressure value, judging whether the dust removal component (3) is blocked or not, and normally starting according to the step two if the dust removal component is not blocked;

according to the third step, after the dust removal assembly (3) is judged to be blocked, the electromagnetic valve (319) is started, part of air is introduced into the third air pipe (318) arranged above the second air pipe (6), the cleaning assembly (303) starts to clean dust until the internal pressure of the air box (401) is restored to the standard value, and then the fan (2) can be normally started according to the second step.