CN109939524B - A dust collecting equipment for factory building - Google Patents
A dust collecting equipment for factory building Download PDFInfo
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- CN109939524B CN109939524B CN201910245521.6A CN201910245521A CN109939524B CN 109939524 B CN109939524 B CN 109939524B CN 201910245521 A CN201910245521 A CN 201910245521A CN 109939524 B CN109939524 B CN 109939524B
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Abstract
The invention discloses dust removing equipment for a factory building, which relates to the technical field of dust removing equipment and comprises a box body, a plurality of filtering assemblies arranged in the box body and used for filtering dust, and an air inlet pipe and an air outlet pipe which are arranged on the box body, wherein an air inlet fan is arranged in the air inlet pipe, an exhaust fan is arranged in the air outlet pipe, the lower part of the box body is in a cone shape with an opening gradually reduced from top to bottom, and a dust exhaust port is arranged at the bottom of the box body. The invention provides a dust removal device which is used for a factory building, can initially filter large-particle dust in air and then perform cloth bag filtering and can reduce cloth bag cleaning frequency.
Description
Technical Field
The invention relates to the technical field of dust removing equipment, in particular to dust removing equipment for a workshop.
Background
Along with the improvement of environmental protection consciousness and safety consciousness of people, dust removing equipment is arranged in a plurality of factories, particularly factories with more dust in the production process work in the environment with serious dust for a long time, and the physical and mental health of people is easily influenced. The dust removing equipment separates dust from flue gas, and discharges filtered air to play a role in circularly purifying air.
The common dust removing equipment is provided with a bag-type dust remover, the price of the dust removing equipment is relatively more practical, and the working principle of the dust removing equipment is that air containing dust in a factory is sucked from an air inlet of the equipment, filtered by a bag and then discharged from an air outlet. However, in the using process, dust can be deposited on the cloth bag for filtering, and the thicker the dust is, the more the filtering efficiency is affected, so that people are required to clean or replace the cloth bag regularly, and the operation is more complicated. Moreover, after the existing dust removing equipment sucks air containing dust, a mechanism is usually not used for initially filtering large-particle dust in the air, and the large-particle dust is directly filtered through the cloth bag, so that dust on the cloth bag is more easily deposited.
Disclosure of Invention
In order to solve the problems, the invention provides a dust removal device which is used for a factory building, can initially filter large-particle dust in air and then perform cloth bag filtration, and can reduce cloth bag cleaning frequency.
In order to achieve the purpose, the invention adopts the following technical scheme: a dust removal device for a factory building comprises a box body, a plurality of filter assemblies arranged in the box body and used for filtering dust, and an air inlet pipe and an air outlet pipe which are arranged on the box body, wherein an air inlet fan is arranged in the air inlet pipe; a water tank is arranged below the box body, water is filled in the water tank, the dust exhaust port extends into the water in the water tank, and the lower port of the air inlet channel faces the water surface in the water tank.
Preferably, a transverse baffle, an air outlet guide plate, a plurality of upper vertical baffles and a plurality of lower vertical baffles are arranged in the box body, the transverse baffle is transversely arranged below the dust falling guide plate, one side edge of the transverse baffle is connected with the lower edge of the air inlet guide plate, the other side edge of the transverse baffle is connected with the upper edge of the dust falling guide plate through the air outlet guide plate, and an air outlet channel is formed between the air outlet guide plate and the box body at one side far away from the air inlet pipe;
the water tank is characterized in that the upper vertical baffle and the lower vertical baffle are vertically arranged below the transverse baffle, the upper vertical baffle is located at the same height, the lower vertical baffle is located at the same height, the upper vertical baffle and the lower vertical baffle are alternately arranged at intervals, the top of the upper vertical baffle is connected with the bottom surface of the transverse baffle, a ventilation gap is reserved between the bottom of the water tank and the water surface of the water tank, the top of the lower vertical baffle is higher than the bottom of the upper vertical baffle, and the bottom of the lower vertical baffle extends into the water in the water tank.
Preferably, a partition board is transversely arranged in the box body, the partition board divides the cavity in the box body into an upper cavity and a lower cavity, the air outlet pipe is communicated with the upper cavity, and the air inlet pipe is communicated with the lower cavity;
each filtering component comprises a columnar iron cage frame, a cloth bag, an air bag box, an air bag, an exhaust fan, an air inlet controller and an exhaust controller, wherein the iron cage frame and the cloth bag are positioned in the lower cavity, and the air bag box, the air bag, the exhaust fan, the air inlet controller and the exhaust controller are all positioned in the upper cavity;
the top of the iron cage frame is provided with a top plate, the bottom of the iron cage frame is provided with a bottom plate, the top plate is fixed with the partition plate, the top plate is provided with a pneumatic communication hole, a dust removing inflation hole and a gas purification exhaust hole, and the cloth bag is sleeved outside the iron cage frame;
the air bag is arranged in the air bag box, and a high-pressure inflation hole c, a high-pressure exhaust hole c and a high-pressure exhaust hole d are formed in the air bag;
the air inlet controller comprises a first shell, a first piston and a first spring, wherein the first shell is tubular and is vertically fixed on the upper part of the top plate, a port at the lower end of the first shell is communicated with the air pressure communicating hole, the upper end of the first shell is sealed, a first piston driving hole, a high-pressure air charging hole b and a high-pressure exhaust hole b are sequentially formed in the side wall of the first shell from top to bottom, and a high-pressure air charging hole a and a high-pressure exhaust hole a are arranged at the same height; the first piston driving hole is communicated with a high-pressure exhaust hole d on the air bag through an air pipe, the high-pressure inflation hole b is communicated with a high-pressure inflation hole c on the air bag through an air pipe, the high-pressure exhaust hole b is communicated with the high-pressure exhaust hole c on the air bag through an air pipe, the high-pressure inflation hole a is communicated with an external high-pressure air source through an air pipe, and the high-pressure exhaust hole a is communicated with a dedusting inflation hole on the top plate through an air pipe; the first piston is arranged in the first shell and is in sliding seal fit with the inner wall of the first shell, the first spring is arranged in the first shell, one end of the first spring is connected with the first piston, the other end of the first spring is connected with the top plate, and the first piston is radially provided with a first through hole; when the first piston is positioned at the upper part of the inner cavity of the first shell, the first connecting hole is communicated with the high-pressure inflation hole a and the high-pressure inflation hole b, the high-pressure exhaust hole a and the high-pressure exhaust hole b are cut off by the first piston, and meanwhile, the first piston driving hole is blocked; when the first piston moves downwards to compress the first spring, the first connecting hole is communicated with the high-pressure exhaust hole a and the high-pressure exhaust hole b, the first piston cuts off the high-pressure inflation hole a and the high-pressure inflation hole b, and meanwhile, the first piston driving hole is communicated with an inner cavity of the first shell above the first piston;
the exhaust controller comprises a second shell, a second piston and a second spring, the second shell is tubular, one end of the second shell is provided with a second piston driving hole, the other end of the second shell is provided with an air pressure balancing hole, the second piston driving hole is communicated with a high-pressure exhaust hole a on the first shell through an air pipe, the side wall of the second shell is provided with a net air exhaust hole a and a net air exhaust hole b, the net air exhaust hole a is connected with a net air exhaust hole on the top plate through an air pipe, and the net air exhaust hole b is connected with an air inlet of the exhaust fan through an air pipe; the second piston is arranged in the second shell and is in sliding sealing fit with the inner wall of the second shell, the second spring is arranged in the second shell, one end of the second spring is connected with the second piston, the other end of the second spring is connected with the inner bottom surface, provided with one end of an air pressure balance hole, of the second shell, the second communicating hole is radially formed in the second piston, when the second piston is located at one end, provided with a second piston driving hole, of the second shell, the second communicating hole is communicated with the air purification air exhaust hole a and the air purification air exhaust hole b, when the second piston moves towards one end, provided with the air pressure balance hole, of the second shell, and when the second spring is compressed, the second communicating hole cuts off the air purification air exhaust hole a and the air purification air.
Preferably, a shunt pipe is arranged in the iron cage frame, the shunt pipe is vertically arranged on the bottom surface of the top plate, the upper end port of the shunt pipe is communicated with the ash removal inflation hole in the top plate, the lower end of the shunt pipe is sealed, and a plurality of exhaust holes facing the inner wall of the cloth bag are formed in the side wall of the shunt pipe.
A dust removal device for a factory building comprises a box body, a plurality of filter assemblies arranged in the box body and used for filtering dust, and an air inlet pipe and an air outlet pipe which are arranged on the box body, wherein an air inlet fan is arranged in the air inlet pipe, an air outlet fan is arranged in the air outlet pipe, the lower part of the box body is in a cone shape with an opening gradually reduced from top to bottom, a dust exhaust port is arranged at the bottom of the box body, an annular guide plate is arranged in the box body, the annular guide plate is in a bucket shape with a large upper opening and a small lower opening, the edge of the upper side of the annular guide plate extends outwards to form a sealing plate connected with the inner wall of the box body, a circulating channel is formed among the sealing plate, the outer wall of the annular guide plate and the inner wall of the box body, the inner pipe orifice of the air inlet pipe is communicated with the circulation channel, the sealing plate is provided with an air outlet, a cutoff plate is longitudinally arranged in the circulation channel, and the inner pipe orifice of the air inlet pipe and the air outlet on the sealing plate are respectively positioned at two sides of the cutoff plate; a water tank is arranged below the box body, water is filled in the water tank, the dust exhaust port extends into the water in the water tank, and the lower edges of the annular guide plate and the cutoff plate also extend into the water in the water tank.
Therefore, the invention has the following beneficial effects: 1. the initial dust removal mechanism is arranged, so that large-particle dust in the air can be filtered out, and then cloth bag filtration is carried out, and the service time of the cloth bag is effectively prolonged; 2. the filter component capable of automatically cleaning the dust in the cloth bag is arranged, the intelligent degree is high, and the cloth bag replacement frequency can be reduced; 3. the manpower for cleaning or replacing the cloth bag can be reduced, and the enterprise cost is reduced.
Drawings
Fig. 1 is a schematic structural diagram of the first embodiment.
FIG. 2 is a sectional view of the first embodiment.
FIG. 3 is a schematic structural diagram of a filter assembly according to one embodiment.
Fig. 4 is an enlarged view at a in fig. 3.
Fig. 5 is an enlarged view at b in fig. 3.
Fig. 6 is an enlarged view at c in fig. 5.
Fig. 7 is an enlarged view at d in fig. 5.
FIG. 8 is a schematic structural view of the air intake controller and the air exhaust controller in cleaning the cloth bag according to the first embodiment.
Fig. 9 is a schematic structural view of the second embodiment.
Fig. 10 is a sectional view taken in the direction of a-a in fig. 9.
FIG. 11 is a schematic view showing the structure of a filter assembly according to the second embodiment.
Fig. 12 is an enlarged view at e in fig. 11.
Fig. 13 is an enlarged view at f in fig. 11.
Fig. 14 is an enlarged view at g in fig. 13.
Fig. 15 is an enlarged view at h in fig. 13.
Fig. 16 is a schematic structural view of the air intake controller and the air exhaust controller in cleaning the cloth bag in the second embodiment.
1: a box body; 101: a dust exhaust port; 102: an air intake guide plate; 103: a dust fall deflector; 104: erecting a baffle; 105: a lower vertical baffle plate; 106: an air outlet guide plate; 107: a transverse baffle plate; 108: an air inlet channel; 109: an air outlet channel; 110: an annular baffle; 111: closing the plate; 112: a circulation channel; 113: an air outlet; 114: a current interrupt plate; 2: an air inlet pipe; 201: an air intake fan; 3: an air outlet pipe; 301: an exhaust fan; 4: a water tank; 5: a filter assembly; 501: an iron cage frame; 502: a cloth bag; 503: an airbag case; 504: an air bag; 505: a top plate; 506: a base plate; 507: a pneumatic communication hole; 508: ash removal aerating holes; 509: a gas-purifying exhaust hole; 510: a high pressure inflation hole c; 511: a high pressure vent hole c; 512: a high-pressure exhaust hole d; 513: a shunt tube; 514: an exhaust hole; 6: a partition plate; 601: an upper cavity; 602: a lower cavity; 7: an air intake controller; 701: a first housing; 702: a first piston; 703: a first spring; 704: a first communication hole; 705: a first piston drive bore; 706: a high-pressure inflation hole a; 707: a high-pressure inflation hole b; 708: a high-pressure exhaust hole a; 709: a high-pressure exhaust hole b; 8: an exhaust controller; 801: a second housing; 802: a second piston; 803: a second spring; 804: a second communication hole; 805: a second piston drive bore; 806: a clean gas extraction hole a; 807: a clean gas exhaust hole b; 808: an air pressure balancing hole; 9: an exhaust fan.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific embodiments.
Example one
Referring to fig. 1 to 8, the dust removing device for a factory building in this embodiment includes a box 1, a plurality of filter assemblies 5 disposed in the box 1 for filtering dust, and an air inlet pipe 2 and an air outlet pipe 3 disposed on the box 1, wherein an air inlet fan 201 is disposed in the air inlet pipe 2, an exhaust fan 301 is disposed in the air outlet pipe 3, the lower portion of the box 1 is a cone with a gradually reduced opening from top to bottom, and a dust exhaust port 101 is disposed at the bottom of the box 1.
An air inlet guide plate 102 and a dust falling guide plate 103 are arranged in the box body 1, as shown in fig. 2, an inner pipe port of the air inlet pipe 2 is arranged towards the air inlet guide plate 102, the upper part of the air inlet guide plate 102 inclines towards the air inlet pipe 2, an air inlet channel 108 is formed between the air inlet guide plate 102 and the box body 1 arranged on one side of the air inlet pipe 2, the dust falling guide plate 103 is obliquely arranged below the filter assembly 5, and the lower edge of the dust falling guide plate 103 is connected with the upper edge of the air inlet guide plate 102. A water tank 4 is arranged below the box body 1, water is filled in the water tank 4, the dust exhaust port 101 extends into the water in the water tank 4, and the lower opening of the air inlet channel 108 faces the water surface in the water tank 4.
The box body 1 is also internally provided with a transverse baffle plate 107, an air outlet guide plate 106, a plurality of upper vertical baffle plates 104 and a plurality of lower vertical baffle plates 105, the transverse baffle plate 107 is transversely arranged below the dust falling guide plate 103, one side edge of the transverse baffle plate 107 is connected with the lower edge of the air inlet guide plate 102, the other side edge of the transverse baffle plate is connected with the upper edge of the dust falling guide plate 103 through the air outlet guide plate 106, and an air outlet channel 109 is formed between the air outlet guide plate 106 and the box body 1 which is far away from one side of the air inlet pipe 2. Go up and erect baffle 104 and erect baffle 105 down and all vertically locate horizontal baffle 107 below, it all is located same height to go up to erect baffle 104, it all is located same height to erect baffle 105 down, it sets up with erecting baffle 105 interval in turn to go up to erect baffle 104 down, the top of going up to erect baffle 104 is connected with the bottom surface of horizontal baffle 107, leave the ventilation clearance between the surface of water in bottom and the basin 4, the top of erecting baffle 105 down is higher than the bottom of erecting baffle 104, the bottom stretches into the aquatic in basin 4.
Transversely be equipped with baffle 6 in the box 1, baffle 6 separates into cavity 601 and lower cavity 602 with the inside cavity of box 1, goes out tuber pipe 3 and last cavity 601 intercommunication, and air-supply line 2 communicates with lower cavity 602.
Each filter assembly 5 includes a cylindrical iron cage frame 501, a cloth bag 502, an air bag box 503, an air bag 504, an exhaust fan 9, an air intake controller 7 and an exhaust controller 8, as shown in fig. 3, the iron cage frame 501 and the cloth bag 502 are located in the lower cavity 602, and the air bag box 503, the air bag 504, the exhaust fan 9, the air intake controller 7 and the exhaust controller 8 are located in the upper cavity 601.
The top of the iron cage frame 501 is provided with a top plate 505, the bottom of the iron cage frame 501 is provided with a bottom plate 506, the top plate 505 is fixed with the partition plate 6, the top plate 505 is provided with an air pressure communicating hole 507, an ash removing air charging hole 508 and a clean air exhaust hole 509, and the cloth bag 502 is sleeved outside the iron cage frame 501.
The airbag 504 is arranged in an airbag box 503, the airbag box 503 is used for limiting the maximum expansion amount of the airbag 504 and preventing the airbag 504 from being inflated excessively and burst, and a high-pressure inflation hole c510, a high-pressure exhaust hole c511 and a high-pressure exhaust hole d512 are arranged on the airbag 504, as shown in fig. 4.
The air intake controller 7 comprises a first housing 701, a first piston 702 and a first spring 703, as shown in fig. 5 and 6, the first housing 701 is tubular and vertically fixed on the upper portion of the top plate 505, a lower end port of the first housing 701 is communicated with the air pressure communication hole 507, an upper end thereof is sealed, a side wall of the first housing 701 is sequentially provided with a first piston driving hole 705, a high pressure inflation hole b707 and a high pressure exhaust hole b709 from top to bottom, a high pressure inflation hole a706 which is at the same height as the high pressure inflation hole b707 and a high pressure exhaust hole a708 which is at the same height as the high pressure exhaust hole b709 are further provided, the first piston driving hole 705 is arranged near the top of the side wall of the first housing 701, the first piston driving hole is communicated with a high pressure exhaust hole d512 on the airbag 504 through an air pipe, the high pressure inflation hole b707 is communicated with a high pressure inflation hole c510 on the airbag 504 through an air pipe, the high pressure exhaust hole b709, the high-pressure inflation hole a706 is communicated with an external high-pressure air source through an air pipe, and the high-pressure exhaust hole a708 is communicated with the ash removal inflation hole 508 on the top plate 505 through the air pipe.
The first piston 702 is arranged in the first shell 701 and is in sliding sealing fit with the inner wall of the first shell 701, the first spring 703 is arranged in the first shell 701, one end of the first spring 703 is connected with the first piston 702, the other end of the first spring 703 is connected with the top plate 505, and a first through hole 704 is radially formed in the first piston 702; when the first piston 702 is positioned at the upper part of the inner cavity of the first shell 701, the first communication hole 704 is communicated with the high-pressure inflation hole a706 and the high-pressure inflation hole b707, the first piston 702 cuts off the high-pressure exhaust hole a708 and the high-pressure exhaust hole b709, and simultaneously, the first piston driving hole 705 is blocked; when the first piston 702 moves down to compress the first spring 703, the first communication hole 704 communicates the high pressure exhaust hole a708 and the high pressure exhaust hole b709, the first piston 702 cuts off the high pressure inflation hole a706 and the high pressure inflation hole b707, and simultaneously, the first piston driving hole 705 communicates with the inner cavity of the first housing 701 above the first piston 702.
The exhaust controller 8 includes a second housing 801, a second piston 802, and a second spring 803, as shown in fig. 5 and 7, the second housing 801 is tubular, one end of the second housing 801 is provided with a second piston driving hole 805, the other end is provided with an air pressure balancing hole 808, the second piston driving hole 805 is communicated with a high pressure exhaust hole a708 on the first housing 701 through an air pipe, a clean air exhaust hole a806 and a clean air exhaust hole b807 are opened on a side wall of the second housing 801, the clean air exhaust hole a806 is connected with a clean air exhaust hole 509 on the top plate 505 through an air pipe, and the clean air exhaust hole b807 is connected with an air inlet of the exhaust fan 9 through an air pipe.
The second piston 802 is disposed in the second housing 801 and is in sliding sealing fit with an inner wall of the second housing 801, the second spring 803 is disposed in the second housing 801, one end of the second spring 803 is connected to the second piston 802, the other end of the second spring is connected to an inner bottom surface of one end of the second housing 801, where the air pressure balance hole 808 is disposed, the second piston 802 is radially provided with a second communication hole 804, when the second piston 802 is located at one end of the second housing 801, where the second piston driving hole 805 is disposed, the second communication hole 804 communicates with the clean air pumping hole a806 and the clean air pumping hole b807, and when the second piston 802 moves toward the end of the second housing 801, where the air pressure balance hole 808 is disposed, and the second spring 803 is compressed, the second piston 802 cuts off the clean air pumping hole a806 and the clean air pumping hole b 807.
A shunt pipe 513 is arranged in the iron cage frame 501, the shunt pipe 513 is vertically arranged on the bottom surface of the top plate 505, an upper end port of the shunt pipe 513 is communicated with the ash removal air inflation hole 508 on the top plate 505, the lower end of the shunt pipe 513 is sealed, and a plurality of exhaust holes 514 facing the inner wall of the cloth bag 502 are formed in the side wall of the shunt pipe 513.
The factory building ash removal during operation, the air that contains the dust passes through the effect of air inlet fan 201, inhales from air-supply line 2, cavity 602 back under the entering, through the slant water conservancy diversion effect of air inlet guide plate 102, most air blows the surface of water in the basin 4 through inlet air channel 108, and large granule dust in the air and water contact can be adsorbed by water to play initial purification's effect. Still be equipped with the last vertical baffle 104 and the lower vertical baffle 105 of alternative installation in the box 1 for the air that blows toward the surface of water from inlet air channel 108 can collide with the surface of water many times, strengthens initial purifying effect. Finally, the initially purified air flows out of the air outlet channel 109 to be secondarily purified by the filter assembly 5.
In the initial state of the filter assembly 5, the first piston 702 is positioned at the upper part of the inner cavity of the first housing 701 through the action of the first spring 703, the first communication hole 704 communicates the high-pressure gas charging hole a706 with the high-pressure gas charging hole b707, and the first piston 702 cuts off the high-pressure gas discharge hole a708 and the high-pressure gas discharge hole b709 and simultaneously blocks the first piston driving hole 705. An external high-pressure air source sequentially passes through the high-pressure inflating hole a706, the first communicating hole 704, the high-pressure inflating hole b707 and the high-pressure inflating hole c510 to be inflated into the air bag 504, and the air bag 504 is inflated and expanded until the air bag is attached to the inner wall of the air bag box 503 and stops expanding.
The second piston 802 is positioned at one end of the second housing 801 where a second piston driving hole 805 is provided by a second spring 803, and a second communication hole 804 communicates a net air suction hole a806 with a net air suction hole b 807. The exhaust fan 9 operates to draw the air in the cloth bag 502 into the upper cavity 601 through the purified air exhaust hole 509, the purified air exhaust hole a806, the second communication hole 804 and the purified air exhaust hole b807 in sequence, and then the air is exhausted from the air outlet pipe 3 under the action of the exhaust fan 301. The air in the cloth bag 502 is continuously pumped out by the exhaust fan 9, negative pressure is formed in the cloth bag 502, meanwhile, air is continuously sucked in from the air inlet pipe 2, positive pressure is formed in the lower cavity 602 outside the cloth bag 502, the air outside the cloth bag 502 passes through the cloth bag 502 to enter the cloth bag 502 through large air pressure difference between the inside and the outside of the cloth bag 502, and at the moment, dust contained in the air can be filtered outside the cloth bag 502 to finish secondary filtration.
The cloth bag 502 is used for filtering dust for a long time, the outer wall of the cloth bag 502 can adsorb more dust, the air outside the cloth bag 502 is influenced to enter the cloth bag 502, the air flow of the side wall of the cloth bag 502 is weakened, the exhaust fan 9 continuously exhausts the air to the upper cavity 601, the negative pressure in the cloth bag 502 can be continuously increased, when the negative pressure reaches a certain value, the negative pressure in the cloth bag 502 can pull the first piston 702 to move downwards due to the communication of the lower end port of the first shell 701 and the air pressure communication hole 507, the first piston driving hole 705 is arranged close to the top of the side wall of the first shell 701, the first piston 702 moves downwards a little distance, the first piston driving hole 705 is communicated with the inner cavity of the first shell 701 above the first piston 702, at the moment, the high-pressure gas in the air bag 504 can enter the inner cavity 701 above the first piston 702 through the high-pressure exhaust hole d512 and the first piston driving hole 705, the first piston 702 is further driven downward and compresses the first spring 703 until the first piston 702 moves downward to the limit position. At this time, the first communication hole 704 communicates the high pressure discharge hole a708 and the high pressure discharge hole b709, and the first piston 702 cuts off the high pressure charge hole a706 and the high pressure charge hole b 707. The external high-pressure air source does not inflate the air bag 504 any more, the high pressure in the air bag 504 is communicated with the inner cavity of the first shell 701 above the first piston 702 to press the first piston 702 downwards, and then sequentially passes through the high-pressure exhaust hole c511, the high-pressure exhaust hole b709, the first communication hole 704 and the high-pressure exhaust hole a708, and is divided into two paths behind the high-pressure exhaust hole a708, one path enters the second shell 801 from the second piston driving hole 805 to drive the second piston 802, and the other path enters the cloth bag 502 from the ash removal inflating hole 508. At this time, the second piston 802 moves toward the end of the second housing 801 where the air pressure balance hole 808 is formed, the second spring 803 is compressed, the second piston 802 cuts off the net air suction hole a806 and the net air suction hole b807, and the air suction fan 9 does not suck air from the cloth bag 502 to the upper cavity 601 as shown in fig. 8. And the other path of high-pressure gas entering the cloth bag 502 from the dust removing gas filling hole 508 can enable the cloth bag 502 to form high pressure and form airflow flowing from the inside of the cloth bag 502 to the outside of the cloth bag 502, at the moment, dust adsorbed on the outer wall of the cloth bag 502 can be separated from the cloth bag 502 and fall onto the dust falling guide plate 103 below the filtering component 5, finally, the dust falls off from the dust falling guide plate 103, falls into the water tank 4 along the air inlet channel 108 and is absorbed by water, and the function of cleaning the cloth bag 502 is completed. In addition, a shunt pipe 513 is arranged in the iron cage frame 501, a plurality of exhaust holes 514 facing the inner wall of the cloth bag 502 are formed in the side wall of the shunt pipe 513, and high-pressure gas is exhausted from the exhaust holes 514 opposite to the inner wall of the cloth bag 502, so that dust on the outer side of the cloth bag 502 can be separated conveniently.
When the air pressure in the air bag 504 is gradually reduced until the first piston 702 cannot be pressed down, the first piston 702 is acted by the first spring 703 and rises to an initial state, namely the first communication hole 704 is communicated with the high-pressure inflation hole a706 and the high-pressure inflation hole b707, the first piston 702 cuts off the high-pressure exhaust hole a708 and the high-pressure exhaust hole b709, meanwhile, the first piston driving hole 705 is blocked, and an external high-pressure air source is pressurized into the air bag 504 again; the second piston 802 is acted by the second spring 803 to return to the end of the second housing 801 where the second piston driving hole 805 is located, the second communication hole 804 communicates the net air pumping hole a806 with the net air pumping hole b807, and the air blower 9 sucks air from the cloth bag 502 to the upper cavity 601. The dust in the air is filtered again, and the air purification effect is achieved. So constantly circulate to, each filtering component 5 all independently triggers the deashing operation according to self sack 502 deposition condition, need not to go on simultaneously.
Example two
Referring to fig. 9 to 16, the dust removing device for a factory building in this embodiment includes a box 1, a plurality of filter assemblies 5 disposed in the box 1 for filtering dust, and an air inlet pipe 2 and an air outlet pipe 3 disposed on the box 1, wherein an air inlet fan 201 is disposed in the air inlet pipe 2, an air outlet fan 301 is disposed in the air outlet pipe 3, the lower portion of the box 1 is in a tapered shape with a gradually reduced opening from top to bottom, and a dust exhaust port 101 is disposed at the bottom of the box 1.
An annular guide plate 110 is arranged in the box body 1, the annular guide plate 110 is in a bucket shape with a large upper opening and a small lower opening, the edge of the upper side of the annular guide plate 110 extends outwards to form a sealing plate 111 connected with the inner wall of the box body 1, a circulation channel 112 is formed between the sealing plate 111 and the outer wall of the annular guide plate 110 and the inner wall of the box body 1, the inner opening of the air inlet pipe 2 is communicated with the circulation channel 112, an air outlet 113 is arranged on the sealing plate 111, a flow-breaking plate 114 is longitudinally arranged in the circulation channel 112, and the inner opening of the air inlet pipe 2 and the air outlet 113 on the sealing plate 111 are respectively positioned at; a water tank 4 is arranged below the box body 1, water is filled in the water tank 4, the dust exhaust port 101 extends into the water in the water tank 4, and the lower edges of the annular guide plate 110 and the blanking plate 114 also extend into the water in the water tank 4, as shown in fig. 9 and 10.
Transversely be equipped with baffle 6 in the box 1, baffle 6 separates into cavity 601 and lower cavity 602 with the inside cavity of box 1, goes out tuber pipe 3 and last cavity 601 intercommunication, and air-supply line 2 communicates with lower cavity 602.
Each filter assembly 5 includes a cylindrical iron cage frame 501, a cloth bag 502, an air bag box 503, an air bag 504, an exhaust fan 9, an air intake controller 7 and an exhaust controller 8, as shown in fig. 11, the iron cage frame 501 and the cloth bag 502 are located in the lower cavity 602, and the air bag box 503, the air bag 504, the exhaust fan 9, the air intake controller 7 and the exhaust controller 8 are located in the upper cavity 601.
The top of the iron cage frame 501 is provided with a top plate 505, the bottom of the iron cage frame 501 is provided with a bottom plate 506, the top plate 505 is fixed with the partition plate 6, the top plate 505 is provided with an air pressure communicating hole 507, an ash removing air charging hole 508 and a clean air exhaust hole 509, and the cloth bag 502 is sleeved outside the iron cage frame 501.
The airbag 504 is arranged in an airbag case 503, the airbag case 503 is used for limiting the maximum expansion amount of the airbag 504 and preventing the airbag 504 from being inflated excessively and burst, and a high-pressure inflation hole c510, a high-pressure exhaust hole c511 and a high-pressure exhaust hole d512 are formed in the airbag 504, as shown in fig. 12.
The air inlet controller 7 comprises a first shell 701, a first piston 702 and a first spring 703, wherein the first shell 701 is tubular and is vertically fixed on the upper part of a top plate 505, a lower end port of the first shell 701 is communicated with an air pressure communication hole 507, the upper end of the first shell 701 is sealed, a first piston driving hole 705, a high-pressure inflation hole b707 and a high-pressure exhaust hole b709 are sequentially arranged on the side wall of the first shell 701 from top to bottom, a high-pressure inflation hole a706 and a high-pressure exhaust hole a708 are also arranged at the same height as the high-pressure inflation hole b707, the high-pressure exhaust hole a708 is also arranged at the same height as the high-pressure exhaust hole b709, the first piston driving hole 705 is arranged close to the top of the side wall of the first shell 701, the first piston driving hole 705 is communicated with a high-pressure exhaust hole d512 on the airbag 504 through an air pipe, the high-pressure inflation hole b707 is communicated with, the high-pressure inflation hole a706 is communicated with an external high-pressure air source through an air pipe, and the high-pressure exhaust hole a708 is communicated with the ash removal inflation hole 508 on the top plate 505 through the air pipe.
The first piston 702 is arranged in the first shell 701 and is in sliding sealing fit with the inner wall of the first shell 701, the first spring 703 is arranged in the first shell 701, one end of the first spring 703 is connected with the first piston 702, the other end of the first spring 703 is connected with the top plate 505, and a first through hole 704 is radially formed in the first piston 702; when the first piston 702 is positioned at the upper part of the inner cavity of the first shell 701, the first communication hole 704 is communicated with the high-pressure inflation hole a706 and the high-pressure inflation hole b707, the first piston 702 cuts off the high-pressure exhaust hole a708 and the high-pressure exhaust hole b709, and simultaneously, the first piston driving hole 705 is blocked; when the first piston 702 moves down to compress the first spring 703, the first communication hole 704 communicates the high pressure exhaust hole a708 and the high pressure exhaust hole b709, the first piston 702 cuts off the high pressure inflation hole a706 and the high pressure inflation hole b707, and simultaneously, the first piston driving hole 705 communicates with the inner cavity of the first housing 701 above the first piston 702.
The exhaust controller 8 includes a second housing 801, a second piston 802 and a second spring 803, the second housing 801 is tubular, one end of the second housing 801 is provided with a second piston driving hole 805, the other end of the second housing 801 is provided with an air pressure balancing hole 808, the second piston driving hole 805 is communicated with a high-pressure exhaust hole a708 on the first housing 701 through an air pipe, a clean air exhaust hole a806 and a clean air exhaust hole b807 are formed in the side wall of the second housing 801, the clean air exhaust hole a806 is connected with a clean air exhaust hole 509 on the top plate 505 through an air pipe, and the clean air exhaust hole b807 is connected with an air inlet of the exhaust fan 9 through an air pipe.
The second piston 802 is disposed in the second housing 801 and is in sliding sealing fit with an inner wall of the second housing 801, the second spring 803 is disposed in the second housing 801, one end of the second spring 803 is connected to the second piston 802, the other end of the second spring is connected to an inner bottom surface of one end of the second housing 801, where the air pressure balance hole 808 is disposed, the second piston 802 is radially provided with a second communication hole 804, when the second piston 802 is located at one end of the second housing 801, where the second piston driving hole 805 is disposed, the second communication hole 804 communicates with the clean air pumping hole a806 and the clean air pumping hole b807, and when the second piston 802 moves toward the end of the second housing 801, where the air pressure balance hole 808 is disposed, and the second spring 803 is compressed, the second piston 802 cuts off the clean air pumping hole a806 and the clean air pumping hole b 807.
A shunt pipe 513 is arranged in the iron cage frame 501, the shunt pipe 513 is vertically arranged on the bottom surface of the top plate 505, an upper end port of the shunt pipe 513 is communicated with the ash removal air inflation hole 508 on the top plate 505, the lower end of the shunt pipe 513 is sealed, and a plurality of exhaust holes 514 facing the inner wall of the cloth bag 502 are formed in the side wall of the shunt pipe 513.
When the plant is in ash removal operation, air containing dust is sucked from the air inlet pipe 2 by the action of the air inlet fan 201, and flows around the circulation channel 112 for one circle, so that the air can be discharged from the air outlet 113 into the lower cavity 602. When the air containing dust flows around the circulation passage 112, large particles of dust in the air come into contact with water and are adsorbed by the water, thereby achieving an initial purification effect. After being discharged from the air outlet 113, the waste water is subjected to secondary purification through the filtering component 5.
In the initial state of the filter assembly 5, the first piston 702 is positioned at the upper part of the inner cavity of the first housing 701 through the action of the first spring 703, the first communication hole 704 communicates the high-pressure gas charging hole a706 with the high-pressure gas charging hole b707, and the first piston 702 cuts off the high-pressure gas discharge hole a708 and the high-pressure gas discharge hole b709 and simultaneously blocks the first piston driving hole 705. An external high-pressure air source sequentially passes through the high-pressure inflating hole a706, the first communicating hole 704, the high-pressure inflating hole b707 and the high-pressure inflating hole c510 to be inflated into the air bag 504, and the air bag 504 is inflated and expanded until the air bag is attached to the inner wall of the air bag box 503 and stops expanding.
The second piston 802 is positioned at one end of the second housing 801 where a second piston driving hole 805 is provided by a second spring 803, and a second communication hole 804 communicates a net air suction hole a806 with a net air suction hole b 807. The exhaust fan 9 operates to draw the air in the cloth bag 502 into the upper cavity 601 through the purified air exhaust hole 509, the purified air exhaust hole a806, the second communication hole 804 and the purified air exhaust hole b807 in sequence, and then the air is exhausted from the air outlet pipe 3 under the action of the exhaust fan 301. The air in the cloth bag 502 is continuously pumped out by the exhaust fan 9, negative pressure is formed in the cloth bag 502, meanwhile, air is continuously sucked in from the air inlet pipe 2, positive pressure is formed in the lower cavity 602 outside the cloth bag 502, the air outside the cloth bag 502 passes through the cloth bag 502 to enter the cloth bag 502 through large air pressure difference between the inside and the outside of the cloth bag 502, and at the moment, dust contained in the air can be filtered outside the cloth bag 502 to finish secondary filtration.
The cloth bag 502 is used for filtering dust for a long time, the outer wall of the cloth bag 502 can adsorb more dust, the air outside the cloth bag 502 is influenced to enter the cloth bag 502, the air flow of the side wall of the cloth bag 502 is weakened, the exhaust fan 9 continuously exhausts the air to the upper cavity 601, the negative pressure in the cloth bag 502 can be continuously increased, when the negative pressure reaches a certain value, the negative pressure in the cloth bag 502 can pull the first piston 702 to move downwards due to the communication of the lower end port of the first shell 701 and the air pressure communication hole 507, the first piston driving hole 705 is arranged close to the top of the side wall of the first shell 701, the first piston 702 moves downwards a little distance, the first piston driving hole 705 is communicated with the inner cavity of the first shell 701 above the first piston 702, at the moment, the high-pressure gas in the air bag 504 can enter the inner cavity 701 above the first piston 702 through the high-pressure exhaust hole d512 and the first piston driving hole 705, the first piston 702 is further driven downward and compresses the first spring 703 until the first piston 702 moves downward to the limit position. At this time, the first communication hole 704 communicates the high pressure discharge hole a708 and the high pressure discharge hole b709, and the first piston 702 cuts off the high pressure charge hole a706 and the high pressure charge hole b 707. The external high-pressure air source does not inflate the air bag 504 any more, the high pressure in the air bag 504 is communicated with the inner cavity of the first shell 701 above the first piston 702 to press the first piston 702 downwards, and then sequentially passes through the high-pressure exhaust hole c511, the high-pressure exhaust hole b709, the first communication hole 704 and the high-pressure exhaust hole a708, and is divided into two paths behind the high-pressure exhaust hole a708, one path enters the second shell 801 from the second piston driving hole 805 to drive the second piston 802, and the other path enters the cloth bag 502 from the ash removal inflating hole 508. At this time, the second piston 802 moves toward the end of the second housing 801 where the air pressure balance hole 808 is formed, the second spring 803 is compressed, the second piston 802 cuts off the net air suction hole a806 and the net air suction hole b807, and the air suction fan 9 does not suck air from the cloth bag 502 to the upper cavity 601 as shown in fig. 16. And the other path of high-pressure gas entering the cloth bag 502 from the dust removing inflating hole 508 enables the cloth bag 502 to form high pressure and forms airflow flowing from the inside of the cloth bag 502 to the outside of the cloth bag 502, at the moment, dust adsorbed on the outer wall of the cloth bag 502 can be separated from the cloth bag 502 and slide down to the water tank 4 from the middle through hole of the annular guide plate 110 to be absorbed by water, and the function of cleaning the cloth bag 502 is completed. In addition, a shunt pipe 513 is arranged in the iron cage frame 501, a plurality of exhaust holes 514 facing the inner wall of the cloth bag 502 are formed in the side wall of the shunt pipe 513, and high-pressure gas is exhausted from the exhaust holes 514 opposite to the inner wall of the cloth bag 502, so that dust on the outer side of the cloth bag 502 can be separated conveniently.
When the air pressure in the air bag 504 is gradually reduced until the first piston 702 cannot be pressed down, the first piston 702 is acted by the first spring 703 and rises to an initial state, namely the first communication hole 704 is communicated with the high-pressure inflation hole a706 and the high-pressure inflation hole b707, the first piston 702 cuts off the high-pressure exhaust hole a708 and the high-pressure exhaust hole b709, meanwhile, the first piston driving hole 705 is blocked, and an external high-pressure air source is pressurized into the air bag 504 again; the second piston 802 is acted by the second spring 803 to return to the end of the second housing 801 where the second piston driving hole 805 is located, the second communication hole 804 communicates the net air pumping hole a806 with the net air pumping hole b807, and the air blower 9 sucks air from the cloth bag 502 to the upper cavity 601. The dust in the air is filtered again, and the air purification effect is achieved. So constantly circulate to, each filtering component 5 all independently triggers the deashing operation according to self sack 502 deposition condition, need not to go on simultaneously.
Claims (3)
1. The utility model provides a dust collecting equipment for factory building, includes box (1), locate a plurality of filter assembly (5) that are used for filtering the dust in box (1) and locate air-supply line (2) and play tuber pipe (3) on box (1), be equipped with inlet fan (201) in air-supply line (2), be equipped with exhaust fan (301) in play tuber pipe (3), box (1) lower part is the toper that from top to bottom the opening diminishes gradually, box (1) bottom is equipped with dust exhaust mouth (101), its characterized in that:
an air inlet guide plate (102) and a dust falling guide plate (103) are arranged in the box body (1), an inner pipe opening of the air inlet pipe (2) is arranged towards the air inlet guide plate (102), the upper part of the air inlet guide plate (102) inclines towards the air inlet pipe (2), an air inlet channel (108) is formed between the air inlet guide plate (102) and the box body (1) provided with one side of the air inlet pipe (2), the dust falling guide plate (103) is obliquely arranged below the filtering component (5), and the lower edge of the dust falling guide plate (103) is connected with the upper edge of the air inlet guide plate (102); a water tank (4) is arranged below the box body (1), water is filled in the water tank (4), the dust exhaust port (101) extends into the water in the water tank (4), and the lower opening of the air inlet channel (108) faces the water surface in the water tank (4);
a partition plate (6) is transversely arranged in the box body (1), the cavity in the box body (1) is divided into an upper cavity (601) and a lower cavity (602) by the partition plate (6), the air outlet pipe (3) is communicated with the upper cavity (601), and the air inlet pipe (2) is communicated with the lower cavity (602);
each filtering component (5) comprises a cylindrical iron cage frame (501), a cloth bag (502), an air bag box (503), an air bag (504), an exhaust fan (9), an air inlet controller (7) and an air exhaust controller (8), wherein the iron cage frame (501) and the cloth bag (502) are positioned in the lower cavity (602), and the air bag box (503), the air bag (504), the exhaust fan (9), the air inlet controller (7) and the air exhaust controller (8) are all positioned in the upper cavity (601);
the top of the iron cage frame (501) is provided with a top plate (505), the bottom of the iron cage frame (501) is provided with a bottom plate (506), the top plate (505) is fixed with the partition plate (6), the top plate (505) is provided with an air pressure communicating hole (507), a dust removing inflating hole (508) and a clean air exhaust hole (509), and the cloth bag (502) is sleeved on the outer side of the iron cage frame (501);
the air bag (504) is arranged in the air bag box (503), and the air bag (504) is provided with a high-pressure inflation hole c (510), a high-pressure exhaust hole c (511) and a high-pressure exhaust hole d (512);
the air inlet controller (7) comprises a first shell (701), a first piston (702) and a first spring (703), the first shell (701) is tubular and is vertically fixed on the upper part of the top plate (505), the lower end port of the first shell (701) is communicated with the air pressure communication hole (507), the upper end of the first shell is sealed, the side wall of the first shell (701) is sequentially provided with a first piston driving hole (705), a high-pressure air charging hole b (707) and a high-pressure exhaust hole b (709) from top to bottom, and the air inlet controller is further provided with a high-pressure air charging hole a (706) which is positioned at the same height as the high-pressure air charging hole b (707) and a high-pressure exhaust hole a (708) which is positioned at the same; the first piston driving hole (705) is communicated with a high-pressure exhaust hole d (512) on the air bag (504) through an air pipe, the high-pressure inflation hole b (707) is communicated with a high-pressure inflation hole c (510) on the air bag (504) through an air pipe, the high-pressure exhaust hole b (709) is communicated with a high-pressure exhaust hole c (511) on the air bag (504) through an air pipe, the high-pressure inflation hole a (706) is communicated with an external high-pressure air source through an air pipe, and the high-pressure exhaust hole a (708) is communicated with an ash removal inflation hole (508) on the top plate (505) through an air pipe; the first piston (702) is arranged in the first shell (701) and is in sliding sealing fit with the inner wall of the first shell (701), the first spring (703) is arranged in the first shell (701), one end of the first spring (703) is connected with the first piston (702), the other end of the first spring (703) is connected with the top plate (505), and a first through hole (704) is radially formed in the first piston (702); when the first piston (702) is positioned at the upper part of the inner cavity of the first shell (701), the first communication hole (704) is communicated with the high-pressure inflation hole a (706) and the high-pressure inflation hole b (707), the first piston (702) cuts off the high-pressure exhaust hole a (708) and the high-pressure exhaust hole b (709), and simultaneously, the first piston driving hole (705) is blocked; when the first piston (702) moves downwards to compress the first spring (703), the first communication hole (704) is communicated with the high-pressure exhaust hole a (708) and the high-pressure exhaust hole b (709), the first piston (702) cuts off the high-pressure inflation hole a (706) and the high-pressure inflation hole b (707), and meanwhile, the first piston driving hole (705) is communicated with an inner cavity of the first shell (701) above the first piston (702);
the exhaust controller (8) comprises a second shell (801), a second piston (802) and a second spring (803), the second shell (801) is tubular, one end of the second shell (801) is provided with a second piston driving hole (805), the other end of the second shell is provided with an air pressure balancing hole (808), the second piston driving hole (805) is communicated with a high-pressure exhaust hole a (708) in the first shell (701) through an air pipe, the side wall of the second shell (801) is provided with a net air suction hole a (806) and a net air suction hole b (807), the net air suction hole a (806) is connected with a net air exhaust hole (509) in the top plate (505) through an air pipe, and the net air suction hole b (807) is connected with an air inlet of the exhaust fan (9) through an air pipe; the second piston (802) is arranged in the second shell (801) and is in sliding sealing fit with the inner wall of the second shell (801), the second spring (803) is arranged in the second shell (801), one end of the second spring (803) is connected with the second piston (802), the other end is connected with the inner bottom surface of one end of the second shell (801) which is provided with an air pressure balance hole (808), a second communication hole (804) is radially arranged on the second piston (802), when the second piston (802) is located at one end of the second housing (801) in which the second piston driving hole (805) is provided, the second communication hole (804) is communicated with the net gas pumping hole a (806) and the net gas pumping hole b (807), when the second piston (802) moves to one end of the second housing (801) where the air pressure balance hole (808) is provided, and the second spring (803) is compressed, the second communication hole (804) cuts off the net gas exhaust hole a (806) and the net gas exhaust hole b (807).
2. The dust removal device for a plant according to claim 1, characterized in that: a transverse baffle (107), an air outlet guide plate (106), a plurality of upper vertical baffles (104) and a plurality of lower vertical baffles (105) are arranged in the box body (1), the transverse baffle (107) is transversely arranged below the dust falling guide plate (103), one side edge of the transverse baffle (107) is connected with the lower edge of the air inlet guide plate (102), the other side edge of the transverse baffle is connected with the upper edge of the dust falling guide plate (103) through the air outlet guide plate (106), and an air outlet channel (109) is formed between the air outlet guide plate (106) and the box body (1) on one side far away from the air inlet pipe (2);
go up and erect baffle (104) and erect baffle (105) down and all vertically locate horizontal baffle (107) below, it all is located the same height to go up to erect baffle (104), it all is located the same height to erect baffle (105) down, it sets up with erecting baffle (105) interval in turn to go up to erect baffle (104), the top of going up to erect baffle (104) is connected with the bottom surface of horizontal baffle (107), leave the ventilation clearance between the surface of water in bottom and basin (4), the top of erecting baffle (105) down is higher than the bottom of last perpendicular baffle (104), the bottom stretches into the aquatic in basin (4).
3. The dust removal device for a plant according to claim 1, characterized in that: be equipped with a shunt tubes (513) in iron cage frame (501), shunt tubes (513) are established immediately in roof (505) bottom surface, and the upper end port of shunt tubes (513) and dust removal aerating hole (508) on roof (505) communicate, and the lower extreme is sealed, offers a plurality of exhaust holes (514) towards the sack (502) inner wall on shunt tubes (513) lateral wall.
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| CN201910245521.6A CN109939524B (en) | 2019-03-28 | 2019-03-28 | A dust collecting equipment for factory building |
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| CN201910245521.6A CN109939524B (en) | 2019-03-28 | 2019-03-28 | A dust collecting equipment for factory building |
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| CN109939524A CN109939524A (en) | 2019-06-28 |
| CN109939524B true CN109939524B (en) | 2021-07-09 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110354591B (en) * | 2019-08-08 | 2021-06-29 | 山东巨佳生物科技有限公司 | Improved generation sack cleaner |
| CN111993917B (en) * | 2020-08-20 | 2022-11-15 | 山东交通学院 | New energy automobile safety charging device |
| CN112827298A (en) * | 2020-12-31 | 2021-05-25 | 江苏晟菲环境科技有限公司 | Wide sack dust removal filter equipment of coal fired boiler of application scope |
| CN113101773B (en) * | 2021-04-07 | 2022-09-09 | 龙岩市辉丰工贸有限公司 | Industrial waste gas handles with filtering dust collector |
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| US5049170A (en) * | 1990-09-11 | 1991-09-17 | Andros Incorporated | Filter assembly for gas analyzer |
| US5744034A (en) * | 1995-06-09 | 1998-04-28 | Hydra Tools International Plc | Hydraulic circuit |
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| CN109939524A (en) | 2019-06-28 |
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Effective date of registration: 20230720 Address after: 311200 D211, Building 1, Hangzhou Yongli Baihe Intelligent Manufacturing Industrial Park, Liansan Village, Yiqiao Town, Xiaoshan District, Hangzhou City, Zhejiang Province Patentee after: Hangzhou Jinhong Electromechanical Technology Co.,Ltd. Address before: Room 110, Yifu science and technology building, School of modern science and technology, China University of metrology, 168 Xueyuan street, Jingkai District, Hangzhou City, Zhejiang Province, 310018 Patentee before: Zhao Cheng |
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