CN115318021B - Bag type dust collector for collecting zinc powder - Google Patents

Abstract

The invention relates to the technical field of bag type dust collectors, and discloses a bag type dust collector for collecting zinc powder, which comprises a box body, wherein a pattern plate is arranged in the box body, a filter bag and a keel frame are sleeved on the pattern plate, a pulse pipe is arranged above the pattern plate, a pulse nozzle is arranged on the pulse pipe, a venturi pipe is arranged below the pulse nozzle, the venturi pipe extends into the filter bag, an inner pipe is arranged in the middle of the keel frame, the top end of the inner pipe extends into the venturi pipe, and a guide seat is connected on the inner wall of the keel frame. According to the invention, the pulse airflow is conveyed to the lower end of the filter bag through the inner pipe and flows upwards from the lower end of the filter bag, so that the filter bag sequentially expands from bottom to top, the problem that the expansion degree of the bottom end of the filter bag is smaller due to the gradual reduction of internal energy when the airflow flows from top to bottom in the prior art is solved, the expansion degree of the lower end of the filter bag is compensated by the airflow flowing from bottom to top, and the dust removal effect of the lower end of the filter bag is improved.

Description

Bag type dust collector for collecting zinc powder

Technical Field

The invention relates to the technical field of bag type dust collectors, in particular to a bag type dust collector for collecting zinc powder.

Background

The dust spraying system of the bag dust collector consists of a controller, a control valve, an electromagnetic pulse valve, a spraying and blowing pipe, an air bag and a protection device. The control instrument is an important control device of the pulse bag dust collector, a client can adjust the pulse period and the pulse width of the pulse bag dust collector to ensure the normal operation of the dust collector, and the quality of the control instrument is related to the dust cleaning effect of the dust collector. The control valve is a valve for opening and closing or switching the gas path. The electric control pulse instrument uses an electromagnetic valve which is a control valve of an injection system of the electric control pulse bag dust collector. The principle of ash removal is that because the dust layer on the surface of the filter bag is continuously thickened, the resistance of the dust removal filter bag to airflow is gradually increased, and the capacity of dust-containing gas passing through the dust removal filter bag is gradually reduced. In fact, the air volume of the bag dust collector will be smaller and smaller. In order to make the bag dust collector work continuously and effectively, the dust on the filter bag must be removed in time, so that the filter bag is always in a relatively clean state.

In the process of ash removal and back blowing, the air flow vibration caused by pulse blowing enables the bag wall to move outwards and expand to the limit position, and then the filter bag contracts reversely to return to the original position under the action of the tension of the filter bag. High-pressure gas flows from the spout blowout along the inner wall of filter bag from the top down, and gaseous internal energy converts the potential energy of filter bag deformation into, consequently, gaseous internal energy reduces from last to down gradually, if can reach the maximum deformation in order to guarantee the bag wall of filter bag below, the gaseous horizontal pressure that receives of the bag wall above the filter bag then is greater than its pressure that expands to the limit, and the deformation of the bag wall above the filter bag is too big, leads to the bag wall of filter bag to damage because of elastic fatigue. Experiments in the prior art prove that most of internal energy of the pulse airflow is converted into kinetic energy for expanding the filter bag and internal energy for promoting the dust layer to break, so that the flow rate of gas flowing out of the side surface of the filter bag is low, dust adhered to the filter holes cannot be blown off, more dust is accumulated in the filter holes, the filter holes are excessively blocked, and the service life of the filter bag is shortened.

Disclosure of Invention

Aiming at the defects of the prior bag type dust collector for collecting zinc powder in the background technology in the using process, the invention provides the bag type dust collector for collecting the zinc powder, which has the advantages of ensuring good dust cleaning effect at the lower end of a filter bag, avoiding excessive blockage of the filter bag and prolonging the service life of the filter bag, and solves the problems in the background technology.

The invention provides the following technical scheme: the utility model provides a zinc powder is collected and is used bag collector, includes the box, install the card in the box, filter bag and keel frame have been cup jointed on the card, the top of card is equipped with the pulse pipe, be equipped with the pulse spout on the pulse pipe, the below of pulse spout is provided with the venturi tube, the venturi tube extends to in the filter bag, keel frame's middle part is provided with the inner tube, the top of inner tube extends to in the venturi tube, be connected with the guide holder on keel frame's the inner wall, the inside of inner tube is provided with rotary driving piece, keel frame's bottom is connected with the end and props the subassembly, keel frame's inside is provided with annular airflow pipe, the lower extreme of inner tube extends to annular airflow pipe's top.

Preferably, a plurality of the inner pipes are connected through a rotary connector to form a pipe body, the pipe body extends from the venturi to the annular airflow pipe, a side gap is formed in the outer wall of each inner pipe, a rotary driving piece is installed inside each inner pipe, and the outside of each inner pipe is connected with the keel frame through a guide seat.

Preferably, the annular airflow pipe comprises a vertical contraction section, a cavity type expansion section and an annular contraction section, the inner diameter of the contraction part in the middle of the vertical contraction section is smaller than the inner diameter of the top end of the vertical contraction section and larger than the inner diameter of the inner pipe, the inner diameter of the cavity type expansion section is larger than the inner diameter of the vertical contraction section, the bottom surface of the cavity type expansion section is arc-shaped, the outlet end of the annular contraction section inclines upwards, the annular airflow pipe is fixedly connected to the keel frame, a bottom hole is formed in the bottom wall of the cavity type expansion section, and the annular airflow pipe is located above the bottom support assembly.

Preferably, the bottom support assembly comprises a fixed base plate, a movable base plate and a spring, an inner groove is formed in the bottom surface of the fixed base plate, a through hole is formed in the top surface of the fixed base plate, the movable base plate is located in the inner groove, the spring is connected between the fixed base plate and the movable base plate, and the outer wall of the movable base plate is formed by staggered connection of outer convex arcs and inner concave arcs.

Preferably, a guide groove is formed in the middle of the guide seat, a guide rod is connected to the inside of the guide groove in a sliding mode, and one end, far away from the guide groove, of the guide rod is connected to the outer wall of the inner pipe.

Preferably, the rotary driving part comprises a fixed long rod, a rolling bearing and an impeller, the top end of the fixed long rod is connected to the connecting plate above the keel frame, the rolling bearing is sleeved on the outer wall of the fixed long rod, the impeller is connected to the rolling bearing, and the outer edge of the impeller is connected with the inner wall of the inner pipe.

The invention has the following beneficial effects:

1. according to the invention, the pulse airflow is conveyed to the lower end of the filter bag through the inner pipe and flows upwards from the lower end of the filter bag, so that the filter bag sequentially expands from bottom to top, the problem that the expansion degree of the bottom end of the filter bag is smaller due to the gradual reduction of internal energy when the airflow flows from top to bottom in the prior art is solved, the expansion degree of the lower end of the filter bag is compensated by the airflow flowing from bottom to top, and the dust removal effect of the lower end of the filter bag is improved.

2. According to the invention, the inner pipe is arranged in the keel frame, the side gap is formed on the outer wall of the inner pipe, and in the process that the filter bag is expanded by the pulse airflow, the airflow sprayed from the inner pipe passes through the expanded filter holes of the filter bag to blow off the zinc powder adhered to the filter holes, so that the amount of the zinc powder in the filter holes is reduced, the filter holes are prevented from being excessively blocked, and the service life of the filter bag is prolonged.

3. According to the invention, the vertical contraction section is arranged on the annular airflow pipe, the airflow which flows from top to bottom and has low speed is sucked into the annular airflow pipe by utilizing the negative pressure formed by the high-speed flow of the airflow sprayed from the inner pipe at the vertical contraction section, the airflow flowing from bottom to top is further complemented, and then the airflow is sprayed on the inner wall of the filter bag through the annular contraction section, so that the dust removing effect on the filter bag is improved.

4. According to the invention, the bottom support assembly is arranged at the bottom end of the keel frame, the movable bottom plate is impacted by air flow, the movable bottom plate drives the filter bag to move downwards, so that the filter bag is longitudinally stretched, the filter bag forms a longitudinal fold due to the concave-convex outer edge structure of the movable bottom plate, a crack is formed between the zinc powder layer and the outer wall of the filter bag, and the zinc powder layer can fall off.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged schematic view of FIG. 1 at A;

FIG. 3 is an enlarged view of FIG. 1 at B;

FIG. 4 is a schematic view of the construction of the annular gas flow tube of the present invention;

FIG. 5 is a cross-sectional view taken at C-C of FIG. 1;

fig. 6 is a schematic structural diagram of the movable base plate according to the present invention.

In the figure: 1. a box body; 2. a pattern plate; 3. a pulse tube; 301. a pulse nozzle; 302. a venturi; 4. a filter bag; 5. a keel frame; 6. an inner tube; 601. side play; 7. an annular gas flow tube; 701. a vertical contraction section; 702. a cavity expansion section; 703. an annular convergent section; 704. a bottom hole; 8. a guide seat; 801. a guide groove; 802. a guide bar; 9. a bottom bracket assembly; 901. fixing the bottom plate; 902. moving the base plate; 903. a spring; 10. a rotating connector; 11. a rotary drive member; 1101. fixing the long rod; 1102. a rotating bearing; 1103. an impeller.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, a bag type dust collector for collecting zinc powder includes a box body 1, a bottom end of the box body 1 is tapered, a screw rod and a motor for driving the screw rod to rotate are generally installed, the bag type dust collector is used for collecting zinc powder and conveying the collected zinc powder to an outer side of the box body 1, a faceplate 2 is installed at an upper end inside the box body 1, a plurality of installation holes are formed in the faceplate 2, filter bags 4 and a keel frame 5 are installed in the installation holes, when the filter bags 4 and the keel frame 5 are installed, the filter bags 4 are firstly placed in an inner cavity of the box body 1 from the installation holes, the filter bags 4 are extruded on an inner wall of the installation holes by using reeds, then the keel frame 5 is placed inside the filter bags 4 from the installation holes, referring to fig. 5, the keel frame 5 can be made of smooth stainless steel, the keel frame 5 includes vertical stainless steel rods and circular stainless steel rods connected to inner sides of the vertical stainless steel rods, and the keel frame 5 is cylindrical. The cavity above the pattern plate 2 is an air outlet cavity, a pulse pipe 3 is arranged in the air outlet cavity, a pulse nozzle 301 which faces downwards vertically is arranged on the pulse pipe 3, a venturi 302 is arranged below the pulse nozzle 301, the outlet end of the venturi 302 extends into the inner cavity of the filter bag 4, one end of the pulse pipe 3 is connected with a pulse valve, a controller and an air bag, the pulse valve is started by the controller, compressed air in the air bag enters the pulse pipe 3 and enters the venturi 302 through the pulse nozzle 301, the air flow speed of the compressed air in the contraction section of the venturi 302 is increased, air flow in the air outlet cavity is sucked into the venturi 302 and enters the filter bag 4, and therefore the filter bag 4 is expanded, and zinc powder falls off from the outer wall of the filter bag 4 by using the inertia force of the zinc powder adhered to the outer wall of the filter bag 4.

In the application, an inner tube 6 is arranged inside a keel frame 5, referring to fig. 1, fig. 2 and fig. 3, the top end of the inner tube 6 extends into an expansion section of a venturi 302, the inner tube 6 and the venturi 302 are coaxially assembled, a side gap 601 is formed in the outer wall of the inner tube 6, referring to fig. 5, the number of the side gaps 601 is at least one, the number of the side gaps 601 is set according to the rotating angle of the inner tube 6, the spraying range of the side gap 601 is 360 degrees within the rotating time period of the inner tube 6, and therefore the inner wall of a filter bag 4 is enabled to be impacted by airflow flowing out of the side gap 601; referring to fig. 3, a plurality of inner tubes 6 are rotatably connected by a rotary connector 10 to form a complete tube, and the rotary connector 10 can be a bearing; a rotary driving part 11 for driving the inner tube 6 to rotate is arranged in the inner tube 6, the rotary driving part 11 comprises a fixed long rod 1101, the fixed long rod 1101 extends downwards from the top end of the keel frame 5, an annular airflow tube 7 positioned at the lower end of the inner tube 6 is arranged in the keel frame 5, the lower end of the fixed long rod 1101 extends to the upper side of the annular airflow tube 7, the top end of the fixed long rod 1101 is connected to a connecting plate at the top end of the keel frame 5, and the fixed long rod 1101 is made of a material with high strength, so that the diameter of the fixed long rod 1101 is as small as possible, the blocking effect of the fixed long rod 1101 on airflow is reduced, and specific materials are selected according to the manufacturing cost; the outer wall of the fixed long rod 1101 is sleeved with a rotating bearing 1102, the outer wall of the rotating bearing 1102 is connected with an impeller 1103, the outer wall of the impeller 1103 is in contact with the inner wall of the inner tube 6, when an air flow enters the inner tube 6 from the top end of the inner tube 6 and impacts on the impeller 1103, the energy of the air flow is converted into the kinetic energy of the rotation of the impeller 1103, and the inner tube 6 rotates along with the impeller 1103 due to the fact that the fixed long rod 1101 is fixed, and therefore the air flow flowing out of the side gap 601 rotates along the inner wall of the filter bag 4. If four side gaps 601 are uniformly distributed on the outer wall of the inner tube 6, the air flow inside the inner tube 6 impacts the impeller 1103 once to drive the inner tube 6 to rotate by at least 45 degrees, the larger the number of rotation turns and the angle of the inner tube 6 are, the more uniform the air flow ejected from the side gaps 601 and received on the inner wall of the filter bag 4 is, the easier the air flow blows out part of the zinc powder adhered to the filter holes of the filter bag 4, so that the zinc powder adhered to the filter holes of the filter bag 4 is reduced, the blockage caused by excessive zinc powder in the filter holes of the filter bag 4 is avoided, and the service life of the filter bag 4 is prolonged. And set the inner tube 6 to the multistage mode of rotating the connection in this application, and all set up one on every inner tube 6 and rotate connector 10, along with the interior pulse airflow of inner tube 6 flows downwards gradually, from last to down assaulting in proper order on impeller 1103 and make the inner tube 6 of being connected with impeller 1103 rotatory, and other inner tubes 6 are because the connection of rotating connector 10, can not hinder current inner tube 6's rotation, reach the effect that improves inner tube 6 slew velocity, perhaps under the prerequisite of guaranteeing inner tube 6 rotation angle and number of rotations, can reduce the loss of inner tube 6 interior pulse airflow energy as far as possible.

Referring to fig. 2 and 5, a guide seat 8 is connected to the inner wall of the keel frame 5, the guide seat 8 is annular, a guide groove 801 is formed in the middle of the guide seat 8, a guide rod 802 is slidably connected to the inside of the guide groove 801, one end of the guide rod 802, which is far away from the guide groove 801, is fixedly connected to the outer wall of the inner tube 6, and when the inner tube 6 rotates, the inner tube 6 is supported and guided by the guide rod 802.

Referring to fig. 2 and 4, the annular airflow pipe 7 includes a vertical contraction section 701, a cavity-shaped expansion section 702 and an annular contraction section 703, an outlet end of the annular contraction section 703 is inclined 45 degrees upwards, a diameter of an opening end of the vertical contraction section 701 is larger than a diameter of a bottom opening of the inner pipe 6, so as to ensure that more airflow can enter the interior of the vertical contraction section 701 from the opening end of the vertical contraction section 701, as shown in fig. 2, a narrowest part between the opening end of the vertical contraction section 701 and the cavity-shaped expansion section 702 is a middle contraction part of the vertical contraction section 701; the inner diameter of the middle contraction part of the vertical contraction section 701 is smaller than the inner diameter of the top end (namely the open end) of the vertical contraction section 701 and larger than the inner diameter of the inner pipe 6, the inner diameter of the middle contraction part of the vertical contraction section 701 is larger than the inner diameter of the inner pipe 6, so that the blocking effect on the air flow sprayed by the inner pipe 6 when passing through the middle contraction part of the vertical contraction section 701 is reduced, and the high-speed flow of the air flow at the middle contraction part of the vertical contraction section 701 is ensured, therefore, when the pulse air flow in the inner pipe 6 enters the middle contraction part of the vertical contraction section 701, negative pressure is generated, so that the air in the filter bag 4 and outside the inner pipe 6 is sucked into the annular air flow pipe 7 by the negative pressure, then the air flow is sprayed to the inner wall of the filter bag 4 through the outlet end of the annular contraction section 703, and the outlet of the annular contraction section is inclined upwards 703, consequently, pulse airflow from annular shrink section 703 export spun has ascending velocity component, make pulse airflow upwards flow along the inner wall of filter bag 4, thereby make filter bag 4 from upwards expanding down, realize that pulse airflow flows from the lower side of filter bag 4 upwards, compensate from last pulse airflow to lower and make the defect that the inflation degree of filter bag 4 is little gradually at the in-process internal energy that flows gradually, this application introduces the bottom of filter bag 4 with partial pulse airflow through inner tube 6, and from the bottom of filter bag 4 upwards flowing, compensate from last problem that the pulse airflow energy that flows down reduces on the one hand, on the other hand, from supreme pulse airflow makes 4 secondary oscillations of filter bag down, thereby improve the effect of cleaing away of the zinc powder of adhesion on the outer wall of filter bag 4. The bottom end of the cavity-type expanding section 702 is arc-shaped, so that the airflow can flow to the annular contraction section 703 on the side surface along the smooth bottom surface after impacting the bottom surface of the cavity-type expanding section 702, and the caliber of the annular contraction section 703 is further reduced relative to the inner diameter of the cavity-type expanding section 702, thereby improving the flow velocity of the pulse airflow.

Referring to fig. 2 and 4, a bottom hole 704 is formed in the middle of the bottom end of the cavity-shaped expansion section 702, a bottom support assembly 9 is connected to the lower end of the keel frame 5, the bottom support assembly 9 includes a fixed bottom plate 901 and a movable bottom plate 902, an inner groove is formed in the bottom end of the fixed bottom plate 901, the fixed bottom plate 901 and the movable bottom plate 902 are connected through a spring 903, a through hole is formed in the top end of the fixed bottom plate 901, and air flow sprayed downwards from the bottom hole 704 impacts the movable bottom plate 902, so that the movable bottom plate 902 moves downwards by overcoming the tension of the spring 903 and the tension of the filter bag 4, and the filter bag 4 is longitudinally elongated. Referring to fig. 6, the edge of the movable bottom plate 902 is formed by smoothly and arcuately connecting convex and concave parts in a staggered manner, when the movable bottom plate 902 moves downward, the filter bag 4 is stretched, and the inner diameter of the filter bag 4 is slightly reduced, so that the convex part of the movable bottom plate 902 contacts with the inner wall of the filter bag 4 to support the filter bag 4, and the concave part of the movable bottom plate 902 does not contact with the inner wall of the filter bag 4, so that the convex part and the concave part of the filter bag 4 in the longitudinal direction are staggered to form a longitudinal-like wrinkle, the zinc powder layer cannot form a wrinkle shape along with the filter bag 4 due to the internal tension of the zinc powder layer, a crack exists between the zinc powder layer and the outer wall of the filter bag 4, the adhesion force between the filter bag 4 and the zinc powder layer is reduced, and the collection of zinc powder is facilitated.

The inner diameter of the opening at the top end of the inner tube 6 corresponds to the amount of air flowing into the inner tube 6, and the amount of air flowing into the inner tube 6 from the top end of the inner tube 6 is recorded as

In the period of time during which the air flow flows from the top end of the inner tube 6 to the rear end of the inner tube 6, the amount of the air flow flowing out of the side clearance 601 is

The amount of air sucked at the port of the vertical constriction 701 is

The amount of airflow from the bottom aperture 704 is

If the air flow jetted out from the inner tube 6 flows upward to the top end of the filter bag 4, the required air flow amount is

Then, then

The amount of air flow directly entering the filter bag 4 through the venturi 302 is also

So that the air flow can flow along the inner wall of the filter bag 4 from the upper end to the lower end. In the prior art, the gas flow is

The calculation method (2) is obtained from the filter area of the filter bag 4. In addition, the friction force generated by the rotation of the impeller 1103 is reduced as much as possible, thereby reducing the kinetic energy that is lost when the air flow in the inner pipe 6 impinges on the impeller 1103.

The air flow velocity from top to bottom is gradually reduced, when the air flows to the lower end of the filter bag 4, the air flow flowing at high speed in the inner tube 6 generates negative pressure when entering the vertical contraction section 701, the air flow from top to bottom is sucked into the annular air flow tube 7 and is sprayed upwards again through the annular contraction section 703, and therefore the air flow flowing upwards is further supplemented. In addition, the distance from the port of the vertical contraction section 701 to the cavity expansion section 702 can be increased properly to avoid the reverse impact force of the airflow impacting on the bottom wall of the cavity expansion section 702 from causing the airflow from top to bottom to be unable to enter the annular airflow tube 7 from the port of the vertical contraction section 701. And this application sets for from last air current to down and from the air current of supreme down all to flow to the other end from the one end of filter bag 4 in above-mentioned airflow calculation process, and during the actual design, also can make the flow distance of the air current from last to down be the two-section of third of filter bag 4, and the flow distance of the air current of supreme down also be the two-section of third of filter bag 4, and two air currents are all covering the one-third section department in the middle part of filter bag 4.

The using method of the invention is as follows:

firstly, the controller controls the pulse valve to open, the gas in the gas bag flows along the pulse pipe 3 and flows into the venturi 302 through the pulse nozzle 301, negative pressure is generated in the contraction section of the venturi 302, a large amount of gas in the gas outlet cavity is sucked into the venturi 302, part of air directly enters the filter bag 4, and part of air enters the inner pipe 6.

Secondly, the airflow directly entering the filter bag 4 flows from top to bottom, the outer wall of the filter bag 4 expands and contracts from top to bottom in sequence, and the zinc powder on the outer wall of the filter bag 4 falls off from the outer wall of the filter bag 4 under the action of inertia; meanwhile, the airflow entering the inner tube 6 impacts the impeller 1103 to drive the inner tube 6 to rotate and is sprayed out through the side gap 601, because the inner diameter of the inner tube 6 is smaller than the inner diameter of the filter bag 4, the flow velocity of the air in the inner tube 6 compensates the kinetic energy lost by the impact of the airflow on the impeller 1103 and the flowing time of the airflow from top to bottom is short, when the airflow in the filter bag 4 moves downwards to expand the filter bag 4, the airflow in the inner tube 6 is sprayed to the expansion part of the filter bag 4 through the side gap 601, and because the filter hole is expanded when the filter bag 4 expands, the airflow sprayed out by the side gap 601 easily impacts the zinc powder in the filter hole, thereby reducing the amount of the zinc powder with viscosity in the filter hole and avoiding the excessive blockage of the filter hole.

Finally, when the airflow in the inner tube 6 flows to the lower end, the airflow enters the annular airflow tube 7, negative pressure is generated at the vertical contraction section 701, the airflow with the speed reduced from top to bottom in the filter bag 4 is sucked into the annular airflow tube 7 and enters the cavity-shaped expansion section 702, part of the airflow impacts the bottom hole 704 to flow out and impact the moving bottom plate 902, so that the moving bottom plate 902 moves downwards, the filter bag 4 is stretched downwards, the filter bag 4 forms a fold, and a gap is formed between the zinc powder on the outer wall of the filter bag 4 and the outer wall of the filter bag 4, so that the zinc powder can fall off conveniently; the air flow in the cavity-shaped expanding section 702 is accelerated to flow out from the annular contracting section 703, and is impacted on the inner wall of the filter bag 4 and flows from bottom to top.

In addition, in the present application, in order to accurately control the amount of intake air and the air flow rate in the inner tube 6, two pulse jets 301 may be installed at adjacent positions on the pulse tube 3, and simultaneously, pulse air flows may be charged into the inner tube 6 and the filter bag 4.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (5)

1. The utility model provides a zinc powder is collected and is used bag collector, includes box (1), install card (2) in box (1), filter bag (4) and keel frame (5) have been cup jointed on card (2), the top of card (2) is equipped with pulse tube (3), be equipped with pulse jet (301) on pulse tube (3), the below of pulse jet (301) is provided with venturi tube (302), venturi tube (302) extend to in filter bag (4), its characterized in that: an inner pipe (6) is arranged in the middle of the keel frame (5), the top end of the inner pipe (6) extends into the venturi tube (302), a guide seat (8) is connected to the inner wall of the keel frame (5), a rotary driving piece (11) is arranged inside the inner pipe (6), a bottom support assembly (9) is connected to the bottom end of the keel frame (5), an annular airflow pipe (7) is arranged inside the keel frame (5), and the lower end of the inner pipe (6) extends to the top end of the annular airflow pipe (7);

the annular airflow pipe (7) comprises a vertical contraction section (701), a cavity type expansion section (702) and an annular contraction section (703), the inner diameter of the contraction position in the middle of the vertical contraction section (701) is smaller than the inner diameter of the top end of the vertical contraction section (701) and larger than the inner diameter of the inner pipe (6), the inner diameter of the cavity type expansion section (702) is larger than the inner diameter of the vertical contraction section (701), the bottom surface of the cavity type expansion section (702) is arc-shaped, the outlet end of the annular contraction section (703) inclines upwards, the annular airflow pipe (7) is fixedly connected to the keel frame (5), a bottom hole (704) is formed in the bottom wall of the cavity type expansion section (702), and the annular airflow pipe (7) is located above the bottom support assembly (9).

2. The bag collector for collecting zinc powder of claim 1, wherein: the inner pipes (6) are connected through rotary connectors (10) to form a pipe body, the pipe body extends from the venturi (302) to the annular airflow pipe (7), a side gap (601) is formed in the outer wall of each inner pipe (6), a rotary driving piece (11) is installed inside each inner pipe (6), and the outside of each inner pipe (6) is connected with the keel frame (5) through a guide seat (8).

3. The dust collector for collecting zinc powder of claim 1, which is characterized in that: the bottom support assembly (9) comprises a fixed bottom plate (901), a movable bottom plate (902) and a spring (903), wherein an inner groove is formed in the bottom surface of the fixed bottom plate (901), a through hole is formed in the top surface of the fixed bottom plate (901), the movable bottom plate (902) is located in the inner groove, the spring (903) is connected between the fixed bottom plate (901) and the movable bottom plate (902), and the outer wall of the movable bottom plate (902) is formed by connecting outer convex arcs and inner concave arcs in a staggered mode.

4. The bag collector for collecting zinc powder of claim 1, wherein: guide way (801) have been seted up at the middle part of guide holder (8), the inside sliding connection of guide way (801) has guide bar (802), the one end that guide bar (802) kept away from guide way (801) is connected on the outer wall of inner tube (6).

5. The dust collector for collecting zinc powder of claim 1, which is characterized in that: the rotary driving piece (11) comprises a fixed long rod (1101), a rolling bearing (1102) and an impeller (1103), the top end of the fixed long rod (1101) is connected to a connecting plate above a keel frame (5), the rolling bearing (1102) is sleeved on the outer wall of the fixed long rod (1101), the impeller (1103) is connected to the rolling bearing (1102) and the outer edge of the impeller (1103) is connected with the inner wall of an inner tube (6).

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