CN211158964U - Pulse bag dust collector filter equipment - Google Patents

Abstract

The utility model discloses a pulse bag dust collector filter equipment belongs to flue gas dust disposal technical field, and its technical scheme main points are including the dust removal storehouse, layered board, air inlet, gas vent, dust bag, pulse air nozzle and dust hopper, and the layered board level sets up in the dust removal storehouse, and inlet port, exhaust hole are seted up respectively on the lateral wall in the dust removal storehouse of both sides about the layered board, and the vertical setting of dust removal bag is in the dust removal storehouse, and pulse air nozzle fixed connection is on the roof in dust removal storehouse, and the dust hopper sets up the bottom in the dust removal storehouse, air inlet department is connected with the filtration pipeline, and filtration pipeline top is connected with the screen cloth, has seted up the sieve mesh on the screen cloth, reaches and avoids grit and dust bag to collide to the effect of extension dust bag life-span.

Description

Pulse bag dust collector filter equipment

Technical Field

The utility model relates to a flue gas dust treatment facility field, in particular to pulse bag dust collector filter equipment.

Background

With the continuous advance of national environmental protection policies, more and more factories are concerned about the emission of industrial waste gases, especially dust-containing gases. The bag-type dust collector is used as a very common industrial dust-containing gas filtering device, and has strong gas processing capacity and high purification efficiency, and is widely used in the industries such as chemical engineering, metallurgy and the like, and because the application scenes of the bag-type dust collector are continuously increased, the problems faced by the bag-type dust collector also tend to be diversified, and how to enable the bag-type dust collector to be further suitable for the specific use scene to become the problem which is very concerned by technical personnel in the related field on the basis of keeping the original characteristics of the bag-type dust collector.

The existing pulse bag-type dust collector comprises a dust collection bin, a layered plate, an air inlet, an air outlet, dust collection bags, pulse air nozzles and a dust collection hopper, wherein the air inlet is formed in the side wall of the bottom of the dust collection bin, the air outlet is formed in the top of the dust collection bin, the layered plate is horizontally arranged in the dust collection bin and divides the dust collection bin into an upper cavity and a lower cavity; the dust collecting hopper is arranged on the bottom surface of the dust removing bin, and the bottom of the dust collecting hopper is provided with a dust discharging port for discharging dust. When the pulse bag-type dust collector is used for collecting dust, gas to be subjected to dust removal is introduced into the gas inlet, the gas can move towards the gas outlet positioned at the top of the dust removal bin under the action of air pressure after entering the gas inlet, the gas can be filtered by the dust removal bag in the process of moving towards the gas outlet, the dust in the gas can be blocked by the dust removal bag, and the gas can pass through the dust removal bag and continue to move towards the gas outlet until the gas is discharged out of the dust removal bin; after this pulse bag dust collector had worked an end time, the dust can be adsorbed on the surface of dust removal bag, at this moment, pulse air nozzle sprays high-pressure pulse air current to the dust removal bag under the control of solenoid valve, high-pressure pulse air current can drive the dust removal bag vibrations to shake off the dust that adsorbs on the dust removal bag, the dust can subside to the dust hopper of dust removal storehouse bottom, after the dust had accumulated an end time in the dust hopper, the workman can open the dust exhaust mouth of dust hopper bottom, will carry out centralized processing from the dust of dust exhaust mouth exhaust.

However, the pulse bag-type dust collector still has the following defects that when the pulse bag-type dust collector is used for removing dust for a lime kiln of a steel enterprise, sand with larger particles also exists in the air flow entering the dust removing bin from the air inlet, the sand moves towards the dust removing bag along with the air flow after entering the bin, the sand collides with or scrapes the dust removing bag in the moving process, and the dust removing bag is damaged after working at one end due to the irregular appearance and the sharp tip or edge of the sand, so that the service life of the dust removing bag is shortened.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims at providing a pulse bag dust collector filter equipment reaches and avoids grit and dust bag to bump to the effect in extension dust bag life-span.

The above technical purpose of the present invention can be achieved by the following technical solutions:

the utility model provides a pulse sack cleaner filter equipment, includes dust removal storehouse, layering board, air inlet, gas vent, dust bag, pulse air nozzle and dust hopper, and the layering board level sets up in the dust removal storehouse, and inlet port, exhaust hole are seted up respectively on the lateral wall in the dust removal storehouse of both sides about the layering board, and the vertical setting of dust bag is in the dust removal storehouse, and pulse air nozzle fixed connection is on the roof in dust removal storehouse, and the dust hopper sets up the bottom in dust removal storehouse, inlet port department is connected with the filtration pipeline, and filtration pipeline top is connected with the screen cloth, has seted up the sieve mesh on the screen cloth.

Through adopting above-mentioned technical scheme, the setting of air filtering pipeline and screen cloth can carry out preliminary screening to the air current that gets into the dust removal storehouse by the air inlet, and the sieve mesh on the screen cloth can block the great grit of granule, makes it stop in album sand pipe to prevent that the grit from getting into the dust removal storehouse along with dust, air current together, fish tail dust removal bag, and then the life of extension dust removal bag.

The utility model discloses further set up to, the gas filtering pipeline includes sand collecting pipe and stand pipe, and sand collecting pipe level sets up, and sand collecting pipe's one end is connected with the air inlet, and the one end fixed connection of air inlet is kept away from with sand collecting pipe to the one end of stand pipe, and the stand pipe upwards sets up to the direction slope of keeping away from sand collecting pipe.

Through adopting above-mentioned technical scheme, the air current gets into and strains the trachea after, can change the upwards flow of slope into under the water conservancy diversion effect of stand pipe to prevent that the air current from getting into the dust removal storehouse along the horizontal direction, avoid the air current to blow up the dust that the bottom of dust removal storehouse is accumulational once more, reduce the work burden of dust removal bag, prolong the life of dust removal bag.

The utility model discloses further set up as, sand collecting pipe is the U type with the longitudinal section of stand pipe, and sand collecting pipe is connected with the screen cloth with the free end of stand pipe, and the one end that sand collecting pipe was kept away from to the stand pipe also is connected with the screen cloth.

Through adopting above-mentioned technical scheme, gaseous water conservancy diversion effect downdip upward flow at the stand pipe, and the air current meets with the screen cloth of sand collection pipe, stand pipe, and the screen cloth blocks the great grit of size that carries in with the air current in the gas filtration pipeline, and air current and dust through the screen cloth then can continue to flow along the ascending direction of slope to contact with the dust pocket rapidly, thereby accomplish the filtration to the air current, and then improve the work efficiency of pulse bag dust collector.

The utility model discloses further set up to, the bottom surface of collection sand pipe is connected with the shakeout door, and the one end that the shakeout door is close to the air inlet is articulated with the lateral wall in dust removal storehouse, and the shakeout door is provided with the torsional spring with the articulated department in dust removal storehouse, two free ends of torsional spring respectively with the bottom surface in shakeout door and the lateral wall fixed connection in dust removal storehouse.

By adopting the technical scheme, gas flows upwards in an inclined manner under the guiding action of the guide pipe, after being filtered by the screen mesh, the filtered gravel slides downwards to the top surface of the shakeout door along the inclined plane of the guide pipe under the action of gravity, when a certain amount of gravel is accumulated on the top surface of the shakeout door, the gravity of the gravel can enable the shakeout door to rotate around the hinged position of the shakeout door and the dust removal bin, and in the rotating process of the shakeout door, the gravel can roll off from the shakeout door under the action of gravity and fall into the dust collection hopper at the bottom of the dust removal bin; when the sand rolls down from the sand falling door, the elasticity of the torsion spring enables the sand falling door to move towards the direction close to the guide pipe again until the sand falling door restores to balance; the sand falling door is matched with the torsional spring for use, sand can be discharged into the dust collecting hopper after a certain amount of sand is accumulated on the top surface of the sand falling door, and the torsional spring can enable the sand falling door to automatically reset after the sand rolls down from the sand falling door.

The utility model discloses further set up to, the one end that the air inlet was kept away from to the knockout door is provided with the limiting plate, and the limiting plate is the rectangle, and one side fixed connection of air inlet is kept away from with the stand pipe to limiting plate length direction's both ends and the bottom fixed connection of two lateral walls of sand collection pipe, limiting plate length direction's a side.

Through adopting above-mentioned technical scheme, when the shakeout door rotates to the direction that is close to the stand pipe under the effect of torsional spring elasticity, the one end that the shakeout door is close to the stand pipe can with the limiting plate butt when the shakeout door is rotatory to the level, prevent that the shakeout door from continuing to rotate and getting into the gas filter pipeline under the effect of torsional spring to make gas can pass through the gas filter pipeline smoothly, and do not receive the influence of shakeout door.

The utility model discloses further set up to, be provided with the grafting subassembly between screen cloth and sand collection pipe, the stand pipe, the grafting subassembly is including grafting piece and inserting groove, and the inserting groove is seted up on the free end of sand collection pipe and the free end of stand pipe, and the inserting groove is the dovetail, grafting piece and screen cloth length direction's both sides fixed connection, and grafting piece and inserting groove cooperation use.

By adopting the technical scheme, the splicing groove is matched with the splicing block for use, so that the screen cloth can be detachably and fixedly connected with the sand collecting pipe and the guide pipe, and convenience is provided for replacing the screen cloth; after the screen cloth appears damaged, carry out timely change to the screen cloth, can prevent the grit to get into the dust removal case to avoid the grit to rip the dust removal bag, and then improve the life of dust removal bag.

The utility model discloses further set up as, the grafting piece is made by flexible material with the screen cloth.

By adopting the technical scheme, when the screen is installed and replaced, the screen and the plug block made of the flexible material can slide to the plug groove at the free end of the sand collecting pipe from the plug groove at the free end of the guide pipe, and smoothly pass through the turning part between the plug groove of the guide pipe and the plug groove of the sand collecting pipe, so that convenience is provided for installing and replacing the screen.

The utility model discloses further set up to, the one end fixedly connected with sand trap that the sand collection pipe is close to the air inlet, and the sand trap upwards sets up to the direction slope of keeping away from the air inlet, and a side of sand trap length direction and the bottom surface fixed connection of sand collection pipe keep off sand trap length direction's both ends respectively with two lateral wall fixed connection of sand collection pipe.

Through adopting above-mentioned technical scheme, the setting of sand blocking plate can block the grit in the gas filtering pipeline after the grit glides along the stand pipe on the one hand, and on the other hand, the sand blocking plate that the slope set up can block partly air current, makes the air current unable will assemble the grit of keeping off the sand plate below and blows up again for the grit can be in the bottom gathering of gas filtering pipeline.

To sum up, the utility model discloses following beneficial effect has:

1. the screen mesh is matched with the gas filtering pipeline for use, so that gravels with larger particles in the gas flow can be filtered, the gravels are prevented from entering the dust removal bin and scratching the dust removal bag, and the service life of the dust removal bag is prolonged;

2. the sand falling door is matched with the torsional spring for use, so that the functions of automatically dumping sand and automatically resetting the sand falling door can be realized, the smoothness of the air filtering channel is ensured, and the sand filtering effect of the air filtering channel is improved;

3. the inserting groove is matched with the inserting block for use, the screen can be replaced conveniently for installation, and the screen can be replaced in time to organize sand and stone to enter the dust removal box, so that the service life of the dust removal bag is prolonged.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a sectional view intended to show the filtered air duct;

FIG. 3 is an enlarged view of a portion at A for illustrating the knockout gate;

fig. 4 is an exploded view intended to show a plug assembly.

Reference numerals: 1. a dust removal bin; 11. a laminate; 12. an air inlet; 13. an exhaust port; 2. a dust removal bag; 3. a pulse air nozzle; 4. a dust collecting hopper; 5. a gas filtering pipeline; 51. a sand collecting pipe; 52. a guide tube; 6. a shakeout door; 61. a torsion spring; 62. a sand baffle plate; 63. a limiting plate; 7. screening a screen; 8. a plug-in assembly; 81. inserting grooves; 82. and (6) plugging the blocks.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The utility model provides a pulse sack cleaner filter equipment, refer to fig. 1 and fig. 2, including dust removal storehouse 1, be provided with horizontally layering board 11 in the dust removal storehouse 1, two parts about layering board 11 will separate dust removal storehouse 1, air inlet 12 has been seted up to dust removal storehouse 1 lateral wall of layering board 11 below, air inlet 12 department is connected with air filtering pipeline 5, gas vent 13 has been seted up to dust removal storehouse 1 lateral wall of layering board 11 top, be provided with dust bag 2 on the layering board 11, dust bag 2 pass layering board 11 and with layering board 11 fixed connection, dust bag 2 top is provided with pulse air nozzle 3, pulse air nozzle 3 is connected with dust removal storehouse 1 roof, the bottom in dust removal storehouse 1 is connected with dust hopper 4.

Airflow containing sand and dust enters the air filtering channel from the air inlet 12, the screen 7 of the air filtering channel primarily screens the airflow, and sand in the airflow is limited in the air filtering channel, so that the sand is prevented from entering the dedusting bin 1 and scratching the dedusting bag 2; the dust and the airflow pass through the sieve holes to enter the dust removal bin 1 and move upwards under the action of air pressure difference, and when the airflow meets the dust removal bags 2, the dust is filtered by gaps among fibers of the dust removal bags 2, and only the airflow is allowed to pass; the airflow moves to the air outlet under the action of the air pressure difference after passing through the dust removing bag 2 and is discharged to the atmosphere.

Referring to fig. 2, the air filtering pipeline 5 comprises a sand collecting pipe 51 and a guide pipe 52, the longitudinal section of the sand collecting pipe 51 is U-shaped, the bottom surface of the sand collecting pipe 51 is coplanar with the bottom surface of the air inlet 12, two side walls of the sand collecting pipe 51 are coplanar with two side walls of the air inlet 12 respectively, and one end of the sand collecting pipe 51 is fixedly connected with the dust removing bin 1; the longitudinal section of the guide pipe 52 is the same as that of the sand collecting pipe 51, the guide pipe 52 is arranged in a direction away from the sand collecting pipe 51 in an upward inclined manner, and one end of the guide pipe 52 close to the sand collecting pipe 51 is fixedly connected with one end of the sand collecting pipe 51 away from the side wall of the dust removing bin 1.

After entering the air filtering channel, the airflow containing sand, stone and dust can move upwards under the guidance of the guide pipe 52, thereby avoiding blowing up the dust accumulated in the dust hopper 4 by the airflow and increasing the dust removal burden of the dust removal bag 2; the air flow moves upwards and meets the screen 7, the dust and air flow pass through the filter holes and enter the dust removing bin 1, and the sand is confined in the filter air passage and falls into the sand collecting pipe 51 under the action of gravity.

Referring to fig. 3, a shakeout opening is formed in the bottom of the sand collecting pipe 51, a shakeout door 6 is arranged in the shakeout opening, the shakeout door 6 is of a rectangular plate-shaped structure, the length and the width of the shakeout door 6 are equal to those of the bottom surface of the sand collecting pipe 51, the length direction of the shakeout door 6 is parallel to that of the sand collecting pipe 51, one end, close to the side wall of the dedusting bin 1, of the shakeout door 6 is hinged to the side wall of the dedusting bin 1, a torsion spring 61 is arranged at the hinged position of the shakeout door 6 and the side wall of the dedusting bin 1, one of two free ends of the torsion spring 61 is fixedly connected with the bottom of the shakeout door 6, and the other free end of the torsion; fixedly connected with sand board 62 on the top surface that shakeout door 6 is close to dust removal storehouse 1 lateral wall one end, and sand board 62 is the platelike structure of rectangle, and keeps away from the upwards setting of the direction slope of air inlet 12 mutually, and one side of sand board 62 length direction and the top surface fixed connection of shakeout door 6.

Referring to fig. 3, one end of the guide pipe 52 close to the sand collecting pipe 51 is connected with a limiting plate 63, the limiting plate 63 is a horizontally arranged rectangular plate-shaped structure, and two ends of the limiting plate 63 in the length direction are fixedly connected with the bottom ends of two side walls of the sand collecting pipe 51; one side of the limiting plate 63 in the length direction is fixedly connected with one end of the guide pipe 52 close to the sand collecting pipe 51.

The sand and stone fall into the sand collecting pipe 51 and then are collected on the shakeout door 6, and the sand blocking plate 62 is arranged to prevent the airflow from blowing to the top surface of the shakeout door 6, so that the sand and stone are prevented from being blown up again, when a certain amount of sand and stone are accumulated on the shakeout door 6, the gravity of the sand and stone can enable the shakeout door 6 to rotate around the hinged position of the shakeout door 6 and the side wall of the dust removing bin 1 and compress the torsion spring 61, and after the shakeout door 6 rotates and becomes an inclined state, the sand and stone can slide down under the action of gravity and fall into the dust collecting hopper 4; the grit falls, and the pressure of the 6 upper surfaces of shakeout door disappears, and shakeout door 6 can return under torsional spring 61's elastic force effect just, and when shakeout door 6 rotated to being close the horizontality, shakeout door 6 length direction's one end and limiting plate 63 butt to the rotation stops, thereby realizes reseing.

Referring to fig. 4, the top of the sand trap 51 and the top of the guide pipe 52 are cut off, and a screen 7 is connected to the cut off positions, the screen 7 having a rectangular mesh structure and made of a flexible material; a plug-in component 8 is arranged between the screen 7 and the sand collecting pipe 51 and between the screen 7 and the guide pipe 52, the plug-in component 8 comprises a plug-in groove 81 and a plug-in block 82, the plug-in groove 81 is arranged at the free end of the sand collecting pipe 51 and the free end of the guide pipe 52, and the plug-in groove 81 is a dovetail groove; the inserting groove 81 is also arranged at one end of the two side walls of the guide pipe 52 far away from the sand collecting pipe 51, and one end of the guide pipe 52 far away from the sand collecting pipe 51 is also connected with a screen; the insertion blocks 82 are fixedly connected with two side surfaces of the screen 7 in the length direction, the insertion blocks 82 are matched with the insertion grooves 81 for use, and the insertion blocks 82 are made of flexible materials.

When the screen cloth 7 positioned at the top of the air filtering pipeline 5 is installed, the insertion blocks 82 on two sides of the screen cloth 7 are respectively inserted into the insertion grooves 81 on two free ends of the guide pipe 52, the screen cloth 7 is pushed, and the insertion blocks 82 slide in the insertion grooves 81 until the first section of the insertion block 82 enters the insertion grooves 81 on the free ends of the sand collecting pipes 51 and abuts against the side wall of the dust removing bin 1, so that the installation of the screen cloth 7 is completed; when the screen cloth 7 at one end of the guide pipe 52 far away from the sand collecting pipe 51 is installed, the inserting blocks 82 at two sides of the screen cloth 7 are respectively inserted into the inserting grooves 81 at one end of the guide pipe 52 far away from the sand collecting pipe 51 along the vertical direction, and then the screen cloth 7 is vertically pulled downwards, so that the inserting blocks 82 slide in the inserting grooves 81 until the top ends of the inserting blocks 82 are aligned with the top ends of the inserting grooves 81.

The utility model discloses a use as follows:

the airflow containing sand, stone and dust enters the air filtering channel from the air inlet 12, and after entering the air filtering channel, the airflow moves upwards under the guidance of the guide pipe 52, so that the dust accumulated in the dust hopper 4 is prevented from being blown up by the airflow; the airflow moves upwards and meets the screen 7, dust and the airflow pass through the filter holes and enter the dust removal bin 1, sand and stones are limited in the air filtering channel and fall into the sand collection pipe 51 under the action of gravity, the sand and stones can be collected on the shakeout door 6 after falling into the sand collection pipe 51, the arrangement of the sand blocking plate 62 can prevent the airflow from blowing to the top surface of the shakeout door 6, so that the sand and stones are prevented from being blown up again, after a certain amount of sand and stones are accumulated on the shakeout door 6, the gravity of the sand and stones can enable the shakeout door 6 to rotate around the hinged position of the shakeout door 6 and the side wall of the dust removal bin 1 and compress the torsion spring 61, and after the shakeout door 6 rotates and becomes an inclined state, the sand and stones slide downwards under the action of gravity and fall into the dust collection hopper 4; when the sand falls, the pressure on the upper surface of the shakeout door 6 disappears, the shakeout door 6 returns to be normal under the action of the elastic force of the torsion spring 61, and when the shakeout door 6 rotates to be horizontal, one end of the shakeout door 6 in the length direction abuts against the limiting plate 63 and stops rotating, so that the reset is realized; the dust and the airflow pass through the sieve holes to enter the dust removal bin 1 and move upwards under the action of air pressure difference, and when the airflow meets the dust removal bags 2, the dust is filtered by gaps among fibers of the dust removal bags 2, and only the airflow is allowed to pass; the airflow moves to the air outlet under the action of the air pressure difference after passing through the dust removing bag 2 and is discharged to the atmosphere.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims (8)

1. The utility model provides a pulse sack cleaner filter equipment, including dust removal storehouse (1), layering board (11), air inlet (12), gas vent (13), dust removal bag (2), pulse air nozzle (3) and dust hopper (4), layering board (11) level sets up at dust removal storehouse (1), air inlet (12), gas vent (13) are seted up respectively on the lateral wall of dust removal storehouse (1) of both sides about layering board (11), the vertical setting of dust removal bag (2) is in dust removal storehouse (1), pulse air nozzle (3) fixed connection is on the roof of dust removal storehouse (1), dust hopper (4) set up the bottom in dust removal storehouse (1), its characterized in that: the air inlet (12) is connected with an air filtering pipeline (5), the top of the air filtering pipeline (5) is connected with a screen (7), and the screen (7) is provided with a screen hole.

2. The filtering device of the pulse bag-type dust collector according to claim 1, wherein: the air filtering pipeline (5) comprises a sand collecting pipe (51) and a guide pipe (52), the sand collecting pipe (51) is horizontally arranged, one end of the sand collecting pipe (51) is connected with the air inlet (12), one end of the guide pipe (52) is fixedly connected with one end of the sand collecting pipe (51) far away from the air inlet (12), and the guide pipe (52) is obliquely and upwards arranged towards the direction far away from the sand collecting pipe (51).

3. The filtering device of the pulse bag-type dust collector according to claim 2, wherein: the sand collecting pipe (51) and the guide pipe (52) are U-shaped in longitudinal section, the free ends of the sand collecting pipe (51) and the guide pipe (52) are connected with the screen (7), and one end, far away from the sand collecting pipe (51), of the guide pipe (52) is also connected with the screen (7).

4. The filtering device of the pulse bag-type dust collector according to claim 3, wherein: the bottom surface of sand collection pipe (51) is connected with shakeout door (6), and shakeout door (6) are close to the one end of air inlet (12) and are articulated with the lateral wall in dust removal storehouse (1), and shakeout door (6) are provided with torsional spring (61) with the articulated department in dust removal storehouse (1), two free ends of torsional spring (61) respectively with the bottom surface in shakeout door (6) and the lateral wall fixed connection in dust removal storehouse (1).

5. The filtering device of the pulse bag-type dust collector according to claim 4, wherein: one end of the sand falling door (6) far away from the air inlet (12) is provided with a limiting plate (63), the limiting plate (63) is rectangular, the two ends of the length direction of the limiting plate (63) are fixedly connected with the bottom ends of the two side walls of the sand collecting pipe (51), and one side of the length direction of the limiting plate (63) is fixedly connected with one side of the guide pipe (52) far away from the air inlet (12).

6. The filtering device of the pulse bag-type dust collector according to claim 3, wherein: be provided with grafting subassembly (8) between screen cloth (7) and sand collection pipe (51), stand pipe (52), grafting subassembly (8) are including grafting piece (82) and inserting groove (81), inserting groove (81) are seted up on the free end of sand collection pipe (51) and the free end of stand pipe (52), inserting groove (81) are the dovetail, grafting piece (82) and screen cloth (7) length direction's both sides fixed connection, and grafting piece (82) and inserting groove (81) cooperation use.

7. The filtering device of the pulse bag-type dust collector according to claim 6, wherein: the insertion block (82) and the screen (7) are both made of flexible materials.

8. The filtering device of the pulse bag-type dust collector according to claim 2, wherein: the sand collecting pipe (51) is close to one end of the air inlet (12) and is fixedly connected with a sand blocking plate (62), the sand blocking plate (62) is inclined upwards in the direction away from the air inlet (12), one side surface of the length direction of the sand blocking plate (62) is fixedly connected with the bottom surface of the sand collecting pipe (51), and the two ends of the length direction of the sand blocking plate (62) are fixedly connected with two side walls of the sand collecting pipe (51) respectively.

Images