A composite dust removal and ventilation device for a high-efficiency cement grinding system

Abstract

The application relates to the technical field of dust removal, in particular to a composite dust removal and ventilation device of a high-efficiency cement grinding system. The device comprises a dust removal box and a partition plate for partitioning the inside of the dust removal box into an exhaust cavity and a dust removal cavity, the bottom of the partition plate is provided with a filter, the top of the partition plate is provided with a driving mechanism for driving the filter to rotate, and the filter is in an annular structure with a closed bottom end; in the composite dust removal and ventilation device of the high-efficiency cement grinding system, an inner isolation mechanism and an outer isolation mechanism are arranged to isolate an inner isolation cavity and an outer isolation cavity from the inner and outer rings of the filter. The high-pressure gas generated in the cleaning process enters the outer isolation cavity from the inner isolation cavity, then under the buffering action of the outer isolation cavity, the gas and dust are slowly discharged through a pressure relief pipe communicated with the outer isolation cavity, so that the cleaning and dust removal operations are simultaneously realized, and the dust-containing gas in the dust removal box is prevented from flowing back to the workshop again.

Description

Technical Field

[0001] This invention relates to the field of dust removal technology, and more specifically, to a composite dust removal and ventilation device for a high-efficiency cement grinding system. Background Technology

[0002] The cement processing industry generates a large amount of fine dust during cement production. This dust, which floats in the air of the processing plant, causes air pollution and seriously damages the respiratory system of workers. Dust collection and ventilation devices are needed to collect this dust.

[0003] Current dust removal and ventilation systems primarily employ a filter cartridge and fan for dust collection and ventilation. For example, Chinese patent CN221964778U uses this structural design. During operation, the fan generates negative pressure to draw air from the factory, which is then filtered through the filter cartridge before being discharged. However, after prolonged use, dust gradually accumulates on the filter cartridge, causing blockage. Therefore, a blower cleaning component is required.

[0004] The jet cleaning assembly rapidly sprays compressed gas into the filter element, causing the gas to flow quickly from inside to outside, thus blowing off dust accumulated on the outside of the filter element and restoring its filtration capacity. However, after prolonged use, the inventors discovered the following problems with current dust collection and ventilation devices:

[0005] Some factories have low dust levels, and their dust collection and ventilation systems contain only a single filter element. This prevents cleaning and dust removal operations from being performed simultaneously. Specifically, because the jet cleaning component needs to spray gas from inside the filter element to the outside, the gas inside the filter element flows outward, preventing dust-laden gas from entering the filter element. Furthermore, the instantaneous discharge of compressed gas can easily cause dust-laden gas in the dust collection box to flow back into the factory, affecting the efficiency of dust collection and ventilation. Summary of the Invention

[0006] The purpose of this invention is to provide a composite dust removal and ventilation device for a high-efficiency cement grinding system. This device isolates the cleaning area by setting an inner cavity and an outer cavity inside the filter element, thereby solving the problem mentioned in the background art, namely, the problem that cleaning a single filter element results in the inability to perform cleaning and dust removal operations simultaneously.

[0007] To achieve the above objectives, the composite dust removal and ventilation device for a high-efficiency cement grinding system includes a dust removal box and a partition plate that divides the interior of the dust removal box into an exhaust chamber and a dust removal chamber. A filter element is provided at the bottom of the partition plate and a drive mechanism for driving the filter element to rotate is provided at the top. The filter element is an annular structure with a sealed bottom. An air inlet pipe communicating with the dust removal chamber and a fan communicating with the exhaust chamber are provided on the side wall of the dust removal box.

[0008] It also includes an isolation mechanism, which has an isolation cavity penetrated by the filter element. The isolation cavity forms an inner cavity inside the filter element and an outer cavity outside the filter element due to the penetration of the filter element. The outer cavity is connected to a pressure relief pipe.

[0009] It also includes a blowing mechanism, which includes a blowing pipe that extends into the filter element. The side wall of the blowing pipe is connected to multiple blowing ports. Clean gas is blown into the inner compartment through the blowing ports, so that the gas in the inner compartment passes through the filter element and enters the outer compartment, and then is discharged through the pressure relief pipe.

[0010] The outer cavity is equipped with a flow-slowing element. When clean gas enters the outer cavity, the flow-slowing element increases the internal space of the outer cavity to reduce the internal pressure of the outer cavity, thereby reducing the speed at which the gas in the outer cavity is discharged through the pressure relief pipe.

[0011] In the above technical solution, the inner and outer diaphragms isolate the cleaning areas of the filter element, allowing only a portion of the filter element to be cleaned, thus achieving simultaneous cleaning and dust removal. Furthermore, the ejected high-pressure airflow is slowly drawn into the dust removal chamber by the flow-retardant element, reducing its impact on the dust and gas within the chamber.

[0012] Based on this, the isolation mechanism includes an inner isolation mechanism located inside the filter element and an outer isolation mechanism located outside the filter element;

[0013] The inner isolation mechanism partially encloses the inner ring of the filter element to form an independent inner cavity;

[0014] The outer isolation mechanism partially encloses the outer ring of the filter element to form an independent outer cavity.

[0015] The specific structure is as follows:

[0016] The internal isolation mechanism includes a partition plate fixedly connected to the blow pipe. The partition plate has a V-shaped structure, and both ends of the partition plate abut against the side wall of the side rod.

[0017] The top of the partition is fixedly connected to a top plate, and the bottom end is attached to the surface of the bottom plate, so that an inner cavity is formed inside the partition.

[0018] The external isolation mechanism includes a square tube-shaped baffle, one end of which is attached to the outer ring of the filter element, and the other end is provided with a flow-slowing element;

[0019] An outer cavity is formed inside the diaphragm, and the pressure relief pipe is located at the bottom of the diaphragm and communicates with the outer cavity;

[0020] The bottom end of the blowpipe rotates through the base plate and is fixedly connected to the partition pipe.

[0021] Based on this, the flow-retarding element includes an air bladder fixedly disposed at the end of the diaphragm away from the filter element. The air bladder can increase the internal space of the diaphragm when the internal pressure increases, eliminating the need for a large diameter pressure relief pipe, allowing gas to be slowly discharged through the pressure relief pipe.

[0022] In another technical solution, one end of the air inlet pipe is inserted into the dust collector and connected to a separator. An air inlet is provided at the top of the end of the air inlet pipe located inside the dust collector. One end of the pressure relief pipe extends into the air inlet pipe, and the portion of the pressure relief pipe extending into the air inlet pipe is inclined.

[0023] The separator includes a housing with an opening at the bottom, the bottom of which is tapered and has a spiral plate inside; the top of the housing has an exhaust pipe extending into the outer cavity, and one side of the top of the housing has an inlet communicating with an intake pipe, the inlet being located at the tangent of the housing.

[0024] This technical solution involves introducing the gas and dust discharged from the pressure relief pipe into the separator for analysis. The gas flow force comes from the pressure inside the outer cavity, thereby separating some of the dust through the separator and reducing the phenomenon of the blown-down dust re-accumulating on the outer ring of the filter element.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1. In this high-efficiency cement grinding system, the composite dust removal and ventilation device uses internal and external isolation mechanisms to separate the inner and outer cavities within the filter element. This allows the high-pressure gas generated during cleaning to enter the outer cavities from the inner cavity. Then, with the buffering effect of the outer cavity, the gas and dust are slowly discharged through a pressure relief pipe connected to the outer cavity. This not only enables simultaneous cleaning and dust removal operations but also reduces the recirculation of dust-laden gas from the dust collector back into the plant.

[0027] 2. In the composite dust removal and ventilation device of this high-efficiency cement grinding system, the gas sprayed by the jetting mechanism can not only clean the filter element, but also enter the separator after cleaning. During the entry process, the dust in the air inlet pipe is also brought in, so that some of the dust in the air inlet pipe and the dust in the outer cavity are separated in the separator, thereby further reducing the phenomenon of the cleaned dust re-accumulating on the outer ring of the filter element. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the internal structure of the housing of the present invention;

[0030] Figure 3This is a schematic diagram of the spray mechanism of the present invention;

[0031] Figure 4 This is a schematic diagram of the nozzle structure of the present invention;

[0032] Figure 5 This is a schematic diagram of the structure of the filter element of the present invention. Figure 1 ;

[0033] Figure 6 This is a schematic diagram of the structure of the filter element of the present invention. Figure 2 ;

[0034] Figure 7 This is a schematic diagram of the internal isolation mechanism of the present invention;

[0035] Figure 8 This is a schematic diagram of the external isolation mechanism of the present invention;

[0036] Figure 9 This is a schematic diagram of the working state of the airbag of the present invention;

[0037] Figure 10 This is a schematic diagram of the pressure relief pipe of the present invention;

[0038] Figure 11 This is a schematic diagram of the separator of the present invention.

[0039] The meanings of the labels in the diagram are as follows:

[0040] 100. Dust collector box; 101. Sealing cover; 102. Air inlet pipe; 103. Fan; 104. Air inlet; 110. Partition plate; 111. Exhaust chamber; 112. Dust collection chamber; 120. Filter element; 121. Base plate; 122. Side rod; 123. Filter element; 130. Pulse blowing mechanism; 131. Air tank; 132. Connecting pipe; 133. Pulse blowing pipe; 134. Pulse blowing nozzle; 140. External gear ring; 141. Drive gear; 14 2. Motor; 150. Internal isolation mechanism; 151. Internal cavity; 152. Partition plate; 153. Top plate; 160. External isolation mechanism; 161. External cavity; 162. Pressure relief pipe; 163. Check valve; 164. Diaphragm pipe; 165. Valve plate; 166. Inlet; 167. Connecting rod; 170. Flow buffer; 171. Airbag; 180. Separator; 181. Outer shell; 182. Spiral plate; 183. Exhaust pipe; 184. Port. Detailed Implementation

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] To address the problem that cleaning and dust removal cannot be performed simultaneously when cleaning a single filter element 123, this invention provides a composite dust removal and ventilation device for a high-efficiency cement grinding system. This device combines the filter element 120 with a fan 103 to achieve both dust removal and ventilation. Figure 1 As shown, the dust removal and ventilation device includes a dust collection box 100. The top of the dust collection box 100 has an open structure to facilitate the installation and maintenance of the internal structure. A sealing cover 101 is snapped onto the opening. During dust removal and ventilation operations, the sealing cover 101 seals the opening at the top of the dust collection box 100.

[0043] like Figure 2 As shown, the bottom of the dust collector 100 is a funnel-shaped structure for convenient dust collection. A material control mechanism is also provided at the bottom of the funnel-shaped structure to facilitate the discharge of dust from inside the dust collector 100. A partition plate 110 is horizontally arranged in the upper middle part of the interior of the dust collector 100. The outer edge of the partition plate 110 is attached to the inner side of the dust collector 100, dividing the interior of the dust collector 100 into two independent areas, namely the exhaust chamber 111 and the dust collection chamber 112. A through hole is provided in the middle of the partition plate 110, and the exhaust chamber 111 and the dust collection chamber 112 are connected through the through hole. In order to achieve the filtration operation, a filter element 120 is provided at the bottom of the partition plate 110 corresponding to the through hole. The filter element 120 is a ring structure with a closed bottom.

[0044] In the above-described configuration, an air inlet pipe 102 and a fan 103 are provided on the side wall of the dust collection box 100. The air inlet pipe 102 is connected to the dust collection chamber 112, and the suction end of the fan 103 is connected to the exhaust chamber 111. The positions of the air inlet pipe 102 and the fan 103 are shown in the reference diagram. Figure 1 and Figure 2 With this design, the fan 103 draws air into the exhaust chamber 111, making the air pressure in the exhaust chamber 111 lower than the air pressure in the dust removal chamber 112. Under this action, the outside air is drawn into the dust removal chamber 112 through the air inlet pipe 102, then filtered by the filter element 120 before entering the exhaust chamber 111, and finally discharged by the fan 103.

[0045] Similarly, the dust removal and ventilation device of the present invention also includes a jet blowing mechanism 130, the jet end of which extends into the interior of the filter element 120 for backflushing the filter element 120. Furthermore, as... Figure 4As shown, it also includes an isolation mechanism with an isolation cavity penetrated by the filter element 120. The isolation cavity, formed by the penetration of the filter element 120, consists of an inner cavity 151 inside the filter element 120 and an outer cavity 161 outside the filter element 120. A blow nozzle 134 is located within the inner cavity 151, and a pressure relief pipe 162 connects to the outer cavity 161. Thus, the blowing mechanism 130 blows clean gas into the inner cavity 151 through its jet nozzle. The gas in the inner cavity 151 passes through the filter element 120 into the outer cavity 161 and is then discharged through the pressure relief pipe 162. Furthermore, a flow-retarding element 170 is provided within the outer cavity 161. When clean gas enters the outer cavity 161, the flow-retarding element 170 increases the internal space of the outer cavity 161, thereby reducing the internal pressure and decreasing the rate at which the gas is discharged through the pressure relief pipe 162.

[0046] In the above, the cleaning gas refers to the gas ejected through the jet end of the jet mechanism 130. For example... Figure 3 As shown, the blowing mechanism 130 includes an air tank 131 and a blowing pipe 133 connected to the air tank 131 via a connecting pipe 132. The bottom end of the blowing pipe 133 extends into the interior of the filter element 120 and is connected to a plurality of blowing ports 134. The plurality of blowing ports 134 are distributed along the height direction of the blowing pipe 133.

[0047] Meanwhile, the dust removal and ventilation device also includes a drive mechanism configured to drive the filter element 120 to rotate, enabling all parts of the filter element 120 to move into the isolation chamber. Specifically, as... Figure 3 As shown, the drive mechanism includes an external gear ring 140 rotatably disposed within a through hole (a through hole located in the middle of the spacer plate 110) and a drive gear 141 meshing with the external gear ring 140. The external gear ring 140 has an annular structure, with tooth blocks located on its outer ring. The bottom end of the external gear ring 140 is fixedly connected to the top end of the filter element 120 (e.g., by snap-fit ​​or threaded connection). The drive gear 141 is coaxially fixedly connected to a motor 142 mounted on the top of the spacer plate 110. Thus, the motor 142 rotates via the drive gear 141, which in turn drives the filter element 120 to rotate via the external gear ring 140.

[0048] The filter element 120 mainly consists of a support frame and an annular filter element 123. For example... Figure 5 As shown, the support frame includes a circular base plate 121, and multiple side rods 122 perpendicular to the base plate 121 are provided on the top of the outer edge of the base plate 121. The top ends of the side rods 122 are fixedly connected to the bottom end of the external toothed ring 140. Figure 6As shown, among the multiple side rods 122, some are located on the inner ring of the filter element 123, and others are located on the outer ring of the filter element 123. At this time, placing the filter element 123 between two corresponding side rods 122 provides support for the filter element 123.

[0049] Furthermore, the present invention also widens a portion of the side rods 122 (this portion includes the side rods 122 located on the inner and outer rings of the filter element 123), and the distribution state after widening is referenced. Figure 6 For example, after widening, refer to Figure 7 The end of the inner diaphragm 151 (described in detail below) fits against the side wall of the side rod 122, which can improve the sealing effect of the inner diaphragm 151.

[0050] In some embodiments, such as Figure 4 As shown, the isolation mechanism includes an inner isolation mechanism 150 located inside the filter element 120 and an outer isolation mechanism 160 located outside the filter element 120. The inner isolation mechanism 150 partially encloses the inner ring of the filter element 120 to form an independent inner cavity 151; the outer isolation mechanism 160 partially encloses the outer ring of the filter element 120 to form an independent outer cavity 161.

[0051] The specific structures of the inner isolation mechanism 150 and the outer isolation mechanism 160 will be described in detail below.

[0052] like Figure 7 As shown, the inner isolation mechanism 150 includes a partition 152, one end of which is bent from one side of the blowpipe 133 to the other, forming a V-shaped structure. The bent portion of the inner cavity 151 is fixedly connected to the blowpipe 133, and both ends abut against the side walls of the side rod 122. Furthermore, a top plate 153 is fixedly connected to the top of the partition 152, and the bottom end is in contact with the surface of the bottom plate 121, forming an inner cavity 151 inside the partition 152. The height of the partition 152 corresponds to the height of the filter element 120.

[0053] like Figure 8 As shown, the outer isolation mechanism 160 includes a square tube-shaped partition 164. One end of the partition 164 is attached to the outer ring of the filter element 120, and the other end is provided with a flow-damping element 170. An outer cavity 161 is formed inside the partition 164, and a pressure relief pipe 162 communicating with the outer cavity 161 is provided at the bottom of the partition 164. Furthermore, the bottom end of the blowpipe 133 rotatably passes through the base plate 121, and the bottom end of the blowpipe 133 is fixedly connected to the bottom of the partition 164 by a connecting rod 167.

[0054] In addition, a one-way valve 163 is also provided inside the outer compartment 161 for allowing gas from the inner compartment 151 to enter. Specifically, as shown... Figure 8In the illustrated embodiment, the one-way valve 163 includes a mounting frame disposed inside the partition tube 164. The side wall of the mounting frame has multiple through inlets 166 distributed along the height of the partition tube 164. A valve plate 165 is rotatably mounted on the side wall of the mounting frame corresponding to each inlet 166 (the rotating part is located above each inlet 166). The valve plate 165 is larger than the inlet 166 and is located on the side of the mounting frame closer to the airbag 171. With this design, when gas in the inner partition chamber 151 passes through the filter element 120 and enters the outer partition chamber 161, the gas pushes the valve plate 165 to rotate, opening the inlets 166. When gas in the outer partition chamber 161 wants to flow into the inner partition chamber 151, the valve plate 165 closes the inlets 166, preventing gas in the outer partition chamber 161 from entering the inner partition chamber 151.

[0055] Alternatively, a magnetic attraction mechanism can be added between the valve plate 165 and the mounting frame to allow the valve plate 165 to fit tightly against the mounting frame, thereby improving the sealing performance between the valve plate 165 and the mounting frame.

[0056] In some embodiments, such as Figure 8 As shown, the flow-damping element 170 includes an airbag 171 fixedly disposed at the end of the septum 164 away from the filter element 120. The airbag 171 is made of an expandable material, such as rubber. In this way, when the air pressure in the outer septum 161 is high, the airbag 171 expands to increase the space of the outer septum 161, thereby reducing the pressure in the outer septum 161 and avoiding the need for a large diameter in the pressure relief pipe 162.

[0057] Because without the airbag 171, the cleaning gas is released rapidly. If the diameter of the pressure relief pipe 162 is set too small, the partition pipe 164 is easily damaged due to excessive internal pressure. If the diameter of the pressure relief pipe 162 is set too large, a large amount of gas will be discharged through the pressure relief pipe 162, causing significant interference with the original gas in the dust collector 100. This invention, by incorporating the airbag 171, allows for a smaller diameter of the pressure relief pipe 162. This prevents the cleaning gas from being completely discharged through the pressure relief pipe 162 instantly; instead, the airbag 171 expands to temporarily store the cleaning gas.

[0058] It should be understood that the purpose of the airbag 171 is to increase the space of the outer septum 161 by inflating it when the air pressure inside the outer septum 161 is too high. Therefore, the flow damper 170 can also adopt other structures. For example, in some other embodiments, the length of the septum 164 can be increased, and then a piston mechanism can be provided inside the septum 164, with a spring to provide the piston with the kinetic energy for resetting. In this way, when the air pressure inside the outer septum 161 is too high, the piston mechanism moves away from the filter element 120 under the action of air pressure, thereby increasing the space of the outer septum 161.

[0059] The working principle of this invention will be described in detail below:

[0060] When the filter element 120 needs cleaning, the cleaning gas (in compressed state) in the gas tank 131 passes through the connecting pipe 132 and then enters the blow pipe 133, and is then sprayed out from the blow nozzle 134, with a large amount of cleaning gas being sprayed out instantaneously. At this time, refer to Figure 9 In the upper half of the diagram, after the cleaning gas enters the inner cavity 151, it begins to flow into the outer cavity 161. During this flow, the cleaning gas blows the dust accumulated on the outer ring of the filter element 120 into the outer cavity 161. Simultaneously, the cleaning gas also enters the outer cavity 161. Then, refer to... Figure 9 The lower half of the diagram shows the cleaning gas and dust discharged through the pressure relief pipe 162. Simultaneously, a large amount of cleaning gas is ejected instantaneously through the nozzle 134. As the air pressure inside the outer compartment 161 increases, the airbag 171 begins to inflate. The expansion of the airbag 171 prevents the air pressure inside the outer compartment 161 from rising rapidly. Therefore, the gas and dust inside the outer compartment 161 do not generate a large impact force when discharged through the pressure relief pipe 162. Then, the filter element 120 is driven to rotate at a certain angle (the angle is set according to the size of the inner isolation mechanism 150 and the outer isolation mechanism 160) to clean the other parts of the filter element 120.

[0061] During this process, the fan 103 is in operation, which puts the dust removal chamber 112 under negative pressure. When the gas and dust are ejected through the pressure relief pipe 162, the air bag 171 has expanded, which has slowed down the discharge speed of the gas and dust. At this time, the impact force of the ejected gas and dust is reduced. At the same time, under the action of the negative pressure inside the dust removal chamber 112, the gas and dust will not be discharged to the outside through the air inlet pipe 102.

[0062] It should be noted that the airbag 171 is preferably made of an easily inflatable material to avoid the need for a large air pressure inside the outer cavity 161 to drive the airbag 171 to inflate.

[0063] In other words, the inner isolation mechanism 150 and the outer isolation mechanism 160 can isolate the inner and outer cavities 151 and 161 within the filter element 120. This allows the high-pressure gas generated during cleaning to enter the outer cavity 161 from the inner cavity 151. Then, under the buffering effect of the outer cavity 161, the gas and dust are slowly discharged through the pressure relief pipe 162 connected to the outer cavity 161. This not only enables simultaneous cleaning and dust removal operations but also reduces the recirculation of dust-laden gas from the dust collector 100 back into the factory.

[0064] Furthermore, considering that the dust collection chamber 112 is under negative pressure, it is easy for the dust discharged through the pressure relief pipe 162 to be drawn back into the outer ring of the filter element 120. Therefore, as follows: Figure 10As shown, one end of the air inlet pipe 102 is inserted into the dust collector 100 and connected to the separator 180, and an air inlet 104 is provided at the top of the end of the air inlet pipe 102 located in the dust collector 100; one end of the pressure relief pipe 162 extends into the air inlet pipe 102, and the part of the pressure relief pipe 162 extending into the air inlet pipe 102 is inclined.

[0065] For details, please refer to Figure 11 The separator 180 includes a housing 181 with an opening at the bottom. The bottom of the housing 181 has a conical structure and a spiral plate 182 is disposed inside. In addition, an exhaust pipe 183 extending into the outer cavity 161 is disposed at the top of the housing 181. A port 184 communicating with the intake pipe 102 is disposed on one side of the top of the housing 181. The port 184 is located at the tangential part of the housing 181.

[0066] During operation, although the operation of the fan 103 causes a negative pressure state in the dust collection chamber 112, the gas ejected by the blowing mechanism 130 enters the outer compartment 161, causing the pressure in the outer compartment 161 to be higher than the pressure in the dust collection chamber 112. At this time, the gas and dust in the outer compartment 161 are discharged into the inlet pipe 102 through the pressure relief pipe 162. Since the inlet pipe 102 is inclined, the gas and dust will flow into the outer casing 181 through the port 184. The gas and dust will enter the outer casing 181 tangentially, forming an external vortex. At this time, the gas and dust move in a spiral shape in the outer casing 181 through the spiral plate 182. During the rotation, the density of the dust is greater than that of the gas. Under the action of centrifugal force, it is thrown towards the inner wall of the outer casing 181. After colliding with the inner wall of the outer casing 181, the dust loses kinetic energy, slides down the wall to the bottom, and is then discharged to the bottom of the dust collection chamber 112. Meanwhile, after the gas reaches the bottom of the cone, the airflow reverses direction to form an inner vortex (rotating in the same direction as the outer vortex), carrying the gas upward and finally being discharged from the exhaust pipe 183.

[0067] It should be noted that the structure and working principle of separator 180 can be referenced from cyclone separator.

[0068] Furthermore, during the discharge process, the gas in the pressure relief pipe 162 will blow the dust in the air intake pipe 102 into the separator 180, so that a portion of the dust-laden gas is separated from the gas through the separator 180, thereby achieving composite dust removal. This dust removal method can reduce the amount of dust discharged through the pressure relief pipe 162 being drawn back into the outer ring of the filter element 120.

[0069] In summary, the gas ejected by the blowing mechanism 130 can not only clean the filter element 120, but also enter the separator 180 after cleaning. During the process of entering, it can also bring in the dust in the air inlet pipe 102, so that some of the dust in the air inlet pipe 102 and the dust in the outer cavity 161 can be separated in the separator 180, thereby further reducing the phenomenon of the cleaned dust re-accumulating on the outer ring of the filter element 120.

[0070] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A composite dust removal and ventilation device for high-efficiency cement grinding system, comprising a dust removal box (100) and a partition plate (110) separating the inside of the dust removal box (100) into an exhaust cavity (111) and a dust removal cavity (112), the bottom of the partition plate (110) is provided with a filter (120), and the top is provided with a driving mechanism for driving the filter (120) to rotate, the filter (120) is a closed annular structure at the bottom end, and the sidewall of the dust removal box (100) is provided with an air inlet pipe (102) communicating with the dust removal cavity (112) and a fan (103) communicating with the exhaust cavity (111); characterized in that: It further comprises an isolation mechanism having an isolation cavity penetrated by the filter (120), and the isolation cavity forms an inner isolation cavity (151) located inside the filter (120) and an outer isolation cavity (161) located outside the filter (120) under the penetration of the filter (120), and the outer isolation cavity (161) is communicated with a pressure relief pipe (162); It further comprises a blowing mechanism (130) comprising a blowing pipe (133) extending into the inside of the filter (120), the sidewall of the blowing pipe (133) is communicated with a plurality of blowing ports (134), and the cleaning gas is blown into the inner isolation cavity (151) through the blowing ports (134), so that the gas in the inner isolation cavity (151) passes through the filter (120) into the outer isolation cavity (161), and then is discharged through the pressure relief pipe (162); The outer isolation cavity (161) is provided with a flow slowing member (170), which slows down the internal pressure of the outer isolation cavity (161) by increasing the internal space of the outer isolation cavity (161) when the cleaning gas enters the outer isolation cavity (161), so as to reduce the speed of the gas in the outer isolation cavity (161) discharged through the pressure relief pipe (162).

2. The composite dust removal and ventilation device of the high-efficiency cement grinding system according to claim 1, characterized in that: The isolation mechanism comprises an inner isolation mechanism (150) located inside the filter (120) and an outer isolation mechanism (160) located outside the filter (120); The inner isolation mechanism (150) encloses part of the inner ring of the filter (120) to form an independent inner isolation cavity (151); The outer isolation mechanism (160) encloses part of the outer ring of the filter (120) to form an independent outer isolation cavity (161).

3. The composite dust removal and ventilation device of the high-efficiency cement grinding system according to claim 1, characterized in that: The driving mechanism comprises an outer gear ring (140) rotatably arranged in a through hole and a driving gear (141) engaged with the outer gear ring (140), the bottom end of the outer gear ring (140) is fixedly connected with the top end of the filter (120), and the driving gear (141) is connected with a power source.

4. The composite dust removal and ventilation device of the high-efficiency cement grinding system according to claim 2, characterized in that: The filter (120) comprises a circular bottom plate (121) and a filter core (123), the top of the outer edge of the bottom plate (121) is provided with a plurality of side rods (122) perpendicular to the bottom plate (121), and the side rods (122) are distributed in the inner ring and the outer ring of the filter core (123) to limit the filter core (123).

5. The composite dust removal and ventilation device of the high-efficiency cement grinding system according to claim 4, characterized in that: The inner isolation mechanism (150) comprises a baffle (152) fixedly connected with the blowing pipe (133), the baffle (152) is in V-shaped structure, and two ends of the baffle (152) abut against the side wall of the side rod (122); The top of the baffle (152) is fixedly connected with a top plate (153), and the bottom end is attached to the surface of the bottom plate (121), so that the inner isolation cavity (151) is formed in the baffle (152).

6. The composite dust removal and ventilation device of the high efficiency cement grinding system according to claim 2, characterized in that: The outer isolation mechanism (160) comprises a square tubular isolation pipe (164), one end of the isolation pipe (164) is attached to the outer ring of the filter (120), and the other end is provided with a flow slowing member (170); The isolation pipe (164) forms an outer isolation cavity (161) inside, the pressure relief pipe (162) is arranged at the bottom of the isolation pipe (164) and communicates with the outer isolation cavity (161); The bottom end of the blowing pipe (133) is rotatably penetrated through the bottom plate (121) and fixedly connected with the isolation pipe (164).

7. The composite dust removal and ventilation device of the high efficiency cement grinding system according to claim 6, characterized in that: The outer isolation cavity (161) is further provided with a one-way valve (163) for the gas in the inner isolation cavity (151) to enter.

8. The composite dust removal and ventilation device of the high efficiency cement grinding system according to claim 1, characterized in that: The flow slowing member (170) comprises an air bag (171) fixedly arranged at the end of the isolation pipe (164) away from the filter (120).

9. The composite dust removal and ventilation device of the high efficiency cement grinding system according to claim 1, characterized in that: One end of the air inlet pipe (102) penetrates into the dust removal box (100) and is communicated with a separator (180), the top of the end of the air inlet pipe (102) in the dust removal box (100) is provided with an air inlet (104); one end of the pressure relief pipe (162) extends into the air inlet pipe (102), and the part of the pressure relief pipe (162) extending into the air inlet pipe (102) is in an inclined state.

10. The composite dust removal and ventilation device of the high-efficiency cement grinding system according to claim 9, characterized in that: The separator (180) comprises an outer shell (181) with an opening at the bottom, the bottom of the outer shell (181) is in conical structure, and a spiral plate (182) is arranged inside; The top of the outer shell (181) is provided with an exhaust pipe (183) extending into the outer isolation cavity (161), and one side of the top of the outer shell (181) is provided with a through hole (184) communicated with the air inlet pipe (102), and the through hole (184) is located at the tangent position of the outer shell (181).

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